Hangzhou, China

Zhejiang University of Technology is located in the city of Hangzhou, Zhejiang Province. It is considered one of the top industrial universities in mainland China and the second largest university in Zhejiang Province after the most comprehensive university - Zhejiang University.Engineering, especially chemical and biological engineering, is its strongest element. During the 1980s it made an effort to become a comprehensive technological university instead of a technological college. It keeps a close and broad relationship to industry.It is a typical technical university of the new generation in China. It followed the trend during the 1980s and 1990s of Chinese technical institutes changing from the soviet specialized style into a much more comprehensive style. Wikipedia.


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Patent
Zhejiang University of Technology and Zhejiang Chiral Medicine Chemicals Co. | Date: 2016-08-25

The disclosure provides a nitrilase from Arabis alpina, which belongs to genus Arabis, family brassicaceae. The disclosure further provides the encoding gene, vector, recombinant bacterial strain, and the application in the manufacturing of (S)-3-cyano-5-methylhexanoic acid. The wet resting cells containing nitrilase Aa-Nit can kinetically resolve racemic IBSN at 1.2 M with a 42% conversion rate in 15 hr and >99% ee value. The disclosure provides a regio- and stereoselective method for the preparation of (S)-3-cyano-5-methylhexanoic acid. This method provides an atom economical, mild, environmental friendly industrial method to manufacture (S)-3-cyano-5-methylhexanoic acid.


Song X.C.,Fujian Normal University | Zheng Y.F.,Zhejiang University of Technology | Ma R.,Fujian Normal University | Zhang Y.Y.,Fujian Normal University | Yin H.Y.,Hangzhou Dianzi University
Journal of Hazardous Materials | Year: 2011

The Mo-doped Bi 2WO 6 three-dimensional (3D) hierarchical microspheres from nanoplates have been synthesized by a hydrothermal route. The products were characterized in detail by multiform techniques: X-ray diffraction (XRD), energy-dispersive X-ray analysis (EDS), scanning electron microscopy (SEM), and UV-vis absorption spectrum. The results of the photocatalytic degradation of Rhodamine-B (RhB) in aqueous solution showed that molybdenum ions doping greatly improved the photocatalytic efficiency of Bi 2WO 6 3D hierarchical microspheres. The Mo-doped Bi 2WO 6 microspheres with atomic ratio of Mo-W of 0.05 had the best activity in photodegradation of RhB in aqueous solution under 500W Xe lamp light irradiation. © 2011 Elsevier B.V.


Zhang D.,Zhejiang University of Technology | Wang Q.-G.,National University of Singapore | Yu L.,Zhejiang University of Technology | Song H.,Zhejiang University of Technology
IEEE Transactions on Instrumentation and Measurement | Year: 2013

This paper is concerned with the fuzzy-model-based fault detection for a class of nonlinear systems with networked measurements where there are significant uncertainties on information. A unified model is proposed to capture four sources of these uncertainties, namely, the sensor saturation, the signal quantization, the general medium access constraint, and the multiple packet dropouts. A simultaneous consideration of these issues reflects the practical networked systems much more closely than the existing works. The goal of this paper is to design a fault detector such that, for all unknown input, control input, and uncertain information, the estimation error between the residual and the fault is minimized. Using the switched system approach and some stochastic analyses, a sufficient condition for the existence of desired fault detector is established and the fault detector gains are computed by solving an optimization problem. Two numerical examples are given to show the effectiveness of the proposed design. © 1963-2012 IEEE.


Zhang D.,Zhejiang University of Technology | Zhang D.,Nanyang Technological University | Cai W.,Nanyang Technological University | Wang Q.-G.,National University of Singapore
Signal Processing | Year: 2014

This paper is concerned with the energy-efficient filtering for a class of wireless sensor networks (WSNs). Due to the power limitation of WSNs, the measurement signal is transmitted to the remote filter infrequently and stochastically. A stochastic framework is proposed to formulate the filtering problem for such systems. A sufficient condition is established such that the filtering error system is mean-square stable and achieves a prescribed disturbance attenuation level in the H∞© 2014 Elsevier B.V. All rights reserved.


Chen Z.-H.,Zhejiang University of Technology | Ma Z.-H.,Shanghai JiaoTong University | Ma Z.-H.,University College London | Chen J.-L.,Nankai University | And 2 more authors.
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2012

Genuine-multipartite-entanglement (GME) concurrence is a measure of genuine multipartite entanglement that generalizes the well-known notion of concurrence. We define an observable for GME concurrence. The observable permits us to avoid full state tomography and leads to different analytic lower bounds. By means of explicit examples we show that entanglement criteria based on the bounds have a better performance with respect to the known methods. © 2012 American Physical Society.


Xu Z.P.,University of Queensland | Zhang J.,Shanghai University | Adebajo M.O.,University of Queensland | Zhang H.,University of Queensland | Zhou C.,Zhejiang University of Technology
Applied Clay Science | Year: 2011

The review paper has briefly summarized the development of the use of layered double hydroxides (LDHs) and their derivatives as heterogeneous and recyclable catalysts/catalyst supports for various reactions in the period of 2005 to early 2010. The catalysis reactions involve a number of important fields, such as organic/pharmaceutical synthesis (e.g. the formation of several types of organic bonds), clean energy (e.g. the production of hydrogen and popular carbon nanotubes), and environmental pollution control (e.g. total decomposition of volatile organic compounds, photodecomposition of organic wastes, DeNOx and DeSOx). The authors have also commented on the state of the art of research and pointed out the potential future directions in developing LDH-based catalysts. This review has thus indicated that LDH-based catalysts are important materials useful in these fields and it is worthwhile making more efforts towards the development of LDH-based catalysts. © 2011 Elsevier B.V.


Liu H.-S.,Zhejiang University of Technology | Lu H.,Beijing Normal University
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2014

We show that for n-dimensional Einstein gravity coupled to a scalar field with mass-squared m02=-n(n-2)/(4ℓ2), the first law of thermodynamics of (charged) AdS black holes will be modified by the boundary conditions of the scalar field at asymptotic infinity. Such scalars can arise in gauged supergravities in four and six dimensions, but not in five or seven. The result provides a guiding principle for constructing designer black holes and solitons in general dimensions, where the properties of the dual field theories depend on the boundary conditions. © 2014 The Authors.


Baker P.J.,New York University | Poultney C.,Courant Institute of Mathematical Sciences | Liu Z.,Zhejiang University of Technology | Gross R.,New York University | And 2 more authors.
Applied Microbiology and Biotechnology | Year: 2012

Cutinases have been exploited for a broad range of reactions, from hydrolysis of soluble and insoluble esters to polymer synthesis. To further expand the biotechnological applications of cutinases for synthetic polyester degradation, we perform a comparative activity and stability analysis of five cutinases from Alternaria brassicicola (AbC), Aspergillus fumigatus (AfC), Aspergillus oryzae (AoC), Humicola insolens (HiC), and the well-characterized Fusarium solani (FsC). Of the cutinases, HiC demonstrated enhanced poly(ε-caprolactone) hydrolysis at high temperatures and under all pH values, followed by AoC and AfC. Both AbC and FsC are least stable and function poorly at high temperatures as well as at acidic pH conditions. Surface charge calculations and phylogenetic analysis reveal two important modes of cutinase stabilization: (1) an overall neutral surface charge within the "crowning area" by the active site and (2) additional disulfide bond formation. These studies provide insights useful for reengineering such enzymes with improved function and stability for a wide range of biotransformations. © 2011 Springer-Verlag.


Xu Z.-F.,University of Pittsburgh | Li X.,University of Maryland University College | Zoller P.,Austrian Academy of Sciences | Zoller P.,University of Innsbruck | And 2 more authors.
Physical Review Letters | Year: 2015

We study a mixture of spin-1 bosonic and spin-1/2 fermionic cold atoms, e.g., Rb87 and Li6, confined in a triangular optical lattice. With fermions at 3/4 filling, Fermi surface nesting leads to spontaneous formation of various spin textures of bosons in the ground state, such as collinear, coplanar, and even noncoplanar spin orders. The phase diagram is mapped out with varying boson tunneling and Bose-Fermi interactions. Most significantly, in one noncoplanar state the mixture is found to exhibit a spontaneous quantum Hall effect in fermions and crystalline superfluidity in bosons, both driven by interaction. © 2015 American Physical Society.


Liu H.-S.,Zhejiang University of Technology | Liu H.-S.,Texas A&M University | Lu H.,Beijing Normal University | Pope C.N.,Texas A&M University | Pope C.N.,University of Cambridge
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2015

We study the shear viscosity to entropy ratio η/S in the boundary field theories dual to black-hole backgrounds in theories of gravity coupled to a scalar field, and generalizations including a Maxwell field and nonminimal scalar couplings. Motivated by the observation in simple examples that the saturation of the η/S≥1/(4π) bound is correlated with the existence of a generalized Smarr relation for the planar black-hole solutions, we investigate this in detail for the general black-hole solutions in these theories, focusing especially on the cases where the scalar field plays a nontrivial role and gives rise to an additional parameter in the space of solutions. We find that a generalized Smarr relation holds in all cases, and in fact it can be viewed as the bulk gravity dual of the statement of the saturation of the viscosity to entropy bound. We obtain the generalized Smarr relation, whose existence depends upon a scaling symmetry of the planar black-hole solutions, by two different but related methods, one based on integrating the first law of thermodynamics, and the other based on the construction of a conserved Noether charge. © 2015 American Physical Society.


Chen T.,University of Surrey | Liu Y.,Zhejiang University of Technology | Chen J.,Chung Yuan Christian University
Journal of Process Control | Year: 2013

In the application of on-line, dynamic process optimisation, adaptive estimation of the system states and parameters is usually needed to minimise the unavoidable model-process mismatch. This work presents an integrated approach to optimal model adaptation and dynamic optimisation, with specific focus on batch processes. An active approach is proposed whereby the input variables are designed so as to maximise the information content of the data for optimal model adaptation. Then, this active adaptation method is combined with the objective of process performance to form a multi-objective optimisation problem. This integrative approach is in contrast to the traditional adaptation method, where only the process performance is considered and adaptation is passively carried out by using the data as is. Two strategies for solving the multi-objective problem are investigated: weighted average and constrained optimisation, and the latter is recommended for the ease in determining the balance between these two objectives. The proposed methodology is demonstrated on a simulated semi-batch fermentation process. © 2013 Elsevier Ltd.


Liu B.,Zhejiang University of Technology | Liu B.,University of Pittsburgh | Li X.,University of Maryland University College | Yin L.,Peking University | And 2 more authors.
Physical Review Letters | Year: 2015

Weyl superconductivity or superfluidity, a fascinating topological state of matter, features novel phenomena such as emergent Weyl fermionic excitations and anomalies. Here we report that an anisotropic Weyl superfluid state can arise as a low temperature stable phase in a 3D dipolar Fermi gas. A crucial ingredient of our model is a direction-dependent two-body effective attraction generated by a rotating external field. Experimental signatures are predicted for cold gases in radio-frequency spectroscopy. The finite temperature phase diagram of this system is studied and the transition temperature of the Weyl superfluidity is found to be within the experimental scope for atomic dipolar Fermi gases. © 2015 American Physical Society.


Song X.C.,Fujian Normal University | Wang X.,Fujian Normal University | Zheng Y.F.,Zhejiang University of Technology | Ma R.,Fujian Normal University | Yin H.Y.,Hangzhou Dianzi University
Journal of Nanoparticle Research | Year: 2011

In this article, the Ag nanoparticles were synthesized on indium tin oxide conducting glass (ITO) substrate using the electrochemical deposition method. The morphology analysis of the deposits using scanning electron microscope (SEM) reveals that the sizes and densities of the Ag nanoparticles were tuned by varying the time of electrodeposition. The structure of the deposits was characterized by X-ray diffraction (XRD). The prepared Ag nanoparticles electrode was then applied to detect hydrogen peroxide (H2O 2) in 0.01 M pH 7.0 phosphate buffer medium. The present electrochemical sensing platform exhibited good electrocatalytic activity towards the reduction of H2O2. The detection sensitivity of the sensor was 0.237 mA mM-1. This method is very simple, inexpensive, and undemanding, thus it should be extensively applied in many fields for the detection of H2O2. © 2011 Springer Science+Business Media B.V.


Zhang D.,Zhejiang University of Technology | Zhang D.,National University of Singapore | Yu L.,Zhejiang University of Technology | Wang Q.-G.,National University of Singapore
International Journal of Adaptive Control and Signal Processing | Year: 2011

This paper is dealt with the fault detection (FD) problem for a class of network-based nonlinear systems with communication constraints and random packet dropouts. The plant is described by a Takagi-Sugeno fuzzy time-delay model, it has multiple sensors and only one of them is actually communicated with the FD filter at each transmission instant, and the packet dropouts occur randomly. The goal is to design a FD filter such that, for all unknown inputs, control inputs, time delays and incomplete data conditions, the estimation error between the residual and 'fault' (or, more generally, the weighted fault) is minimized. By casting the addressed FD problem into an auxiliary H∞ filtering problem of a stochastic switched fuzzy time-delay system, a sufficient condition for the existence of the desired FD filter is established in terms of linear matrix inequalities. A numerical example is provided to illustrate the effectiveness and applicability of the proposed technique. Copyright © 2011 John Wiley & Sons, Ltd.


Xu X.,Zhejiang University of Technology | Chen S.,Zhejiang University of Technology | Huang W.,Zhejiang University of Technology | Gao L.,Wenzhou University
Neurocomputing | Year: 2013

This paper investigates the leader-following consensus problem of discrete-time multi-agent systems. The dynamics of the leader and all following agents adopt the same general form of a linear model that can be of any order. The interconnection topology among the agents is assumed to be switching and undirected. To track the active leader, two kinds of distributed observer-based consensus protocols are proposed for each following agent, whose distributed observers are used to estimate the leader's state and the tracking error based on the relative outputs of neighboring agents, respectively. In light of the modified discrete-time algebraic Riccati equality and Lyapunov method, we prove that the discrete-time leader-following consensus problem can be solved by proposing the distributed observer-based consensus protocol under switching topologies. Finally, a numerical example is given to illustrate the obtained result. © 2013 Elsevier B.V.


Lu Z.,University of California at Riverside | Lin K.,Zhejiang University of Technology | Gan J.,University of California at Riverside
Environmental Pollution | Year: 2011

Bisphenol F (BPF), an environmental estrogen, is used as a monomer in plastic industry and its environmental fate and decontamination are emerging concern. This study focused on the kinetics, influencing factors and pathways of its oxidation by MnO 2. At pH 5.5, about 90% of BPF was oxidized in 20 min in a solution containing 100 μM MnO 2 and 4.4 μM BPF. The reaction was pH-dependent, following an order of pH 4.5 > pH 5.5 > pH 8.6 > pH 7.5 > pH 6.5 > pH 9.6. Humic acids inhibited the reaction at low (≤pH 5.5) and high pH (≥pH 8.6) at high concentrations. In addition, metal ions and anions also suppressed the reaction, following the order Mn 2+ > Ca 2+ > Mg 2+ > Na + and HPO 4 2- > Cl - > NO 3 - ≈ SO 4 2-, respectively. A total of 5 products were identified, from which a tentative pathway was proposed. © 2010 Published by Elsevier Ltd.


Liu W.,Zhejiang University of Technology | Zhang H.,Zhejiang University of Technology | Cao B.,Zhejiang University of Technology | Lin K.,Zhejiang University of Technology | Gan J.,University of California at Riverside
Water Research | Year: 2011

Bisphenol A (BPA), a controversial endocrine disruptor, is ubiquitous in the aquatic environment. In this study, the oxidative degradation of BPA and its mechanism using zero valent aluminum (ZVAl)-acid system under air-equilibrated conditions was investigated. Under pH <3.5 acidic conditions, ZVAl demonstrated an excellent capacity to remove BPA. More than 75% of BPA was eliminated within 12 h in pH 1.5 reaction solutions initially containing 4.0 g/L aluminum and 2.0 mg/L BPA at 25 ± 1 °C. The removal of BPA was further accelerated with increasing aluminum loadings. Higher temperature and lower initial pH also facilitated BPA removal. The addition of Fe2+ into the ZVAl-acid system significantly accelerated the reaction likely due to the enhancing transformation of H2O2 to HO via Fenton reaction. Furthermore, the primary products or intermediates including monohydroxylated BPA, hydroquinone, 2-(4-hydroxyphenyl)propane and 4-isopropenylphenol, were identified and a possible reaction scheme was proposed. The remarkable capacity of the ZVAl-acid system in removing BPA displays its potential application in the treatment of organic compound-contaminated water. © 2010 Elsevier Ltd.


Zhu O.,Zhejiang University of Technology | Zhan R.,National University of Singapore | Liu B.,National University of Singapore
Macromolecular Rapid Communications | Year: 2010

Herein we describe a novel and simple conjugated polymer-fluorescent probe based platform for trypsin detection from protein mixtures in homogeneous solution. This platform takes advantage of specific interaction between the probe and the active site of trypsin and the electrostatic interaction between the polymer and the protein to mediate energy transfer between the polymer and the probe. This method does not require any separation steps, which should facilitate high-throughput protease screening and drug discovery. (Figure Presented) © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Lu X.-M.,China Institute of Technology | Lu P.-Z.,Zhejiang University of Technology
Applied Microbiology and Biotechnology | Year: 2014

The 454 pyrosequencing technique was applied to evaluate microbial community composition in sediment and water samples collected from the river receiving effluents from a swine farm and a farmhouse restaurant, respectively. For each sample, 4,600 effective sequences were selected and used to do the bacterial diversity and abundance analysis, respectively. Bacterial phylotype richness in the river sediment sample without effluent input was higher than the other samples, and the river water sample with addition of effluent from the swine farm had the least richness. Effluents from both the swine farm and the farmhouse restaurant have the potential to decrease the bacterial diversity and abundance in the river sediment and water, especially it is more significant in the river sediment. Effect of effluent from the swine farm on riverine bacterial communities was more significant than that from the farmhouse restaurant. Characterization of bacterial community composition in sediments from two tributaries of the downstream river showed that various effluents from the swine farm and the farmhouse restaurant have the similar potential to reduce the natural variability in riverine ecosystems, and contribute to the biotic homogenization in the river sediment. © 2014 Springer-Verlag.


Nie X.,Zhejiang University of Technology | Zhang Q.,Zhejiang University of Technology
Food Chemistry | Year: 2014

The effect of an amine-negative mixed starter culture (Lactobacillus plantarum ZY40 plus Saccharomyces cerevisiae JM19) on biogenic amine accumulation in fermented silver carp sausage was studied. Microbial counts, pH, titratable acid and free amino acids were also determined. Putrescine, cadaverine and tyramine were the main amines formed during sausage fermentation. The contents of putrescine and cadaverine were greatly reduced by the addition of L. plantarum ZY40 plus S. cerevisiae JM19, whereas tyramine accumulation was enhanced as compared to the control batch. Histamine and spermidine were not affected by the mixed starter culture, and their levels varied slightly throughout the fermentation. Besides, no positive correction between pH, free amino acid content and biogenic amine accumulation were found. © 2014 Elsevier B.V. All rights reserved.


Lin K.,Zhejiang University of Technology | Gan J.,University of California at Riverside
Chemosphere | Year: 2011

Presence of pharmaceuticals at trace levels in recycled water is an emerging issue impacting the beneficial reuse of treated wastewater, including practices such as irrigation and groundwater recharge in arid and semi-arid regions. To assess the environmental risks of irrigation with recycled water containing such micropollutants, in this study we evaluated sorption and degradation of five pharmaceuticals that are antibiotic and anti-inflammatory drugs in two soils collected from arid regions. Naproxen and trimethoprim showed moderate to strong sorption, while the sorption of diclofenac, ibuprofen and sulfamethoxazole was negligible in both soils. Under aerobic conditions, the studied compounds were susceptible to microbial degradation with half-lives varying from 4.8 to 69.3. d. Apart from sulfamethoxazole, the other compounds were relatively persistent under anaerobic conditions as indicated by a negligible loss over 84. d of incubation or half-lives >50. d. The degradation of the selected pharmaceuticals was influenced by microbial activities, oxygen status in the soil, soil type and compound characteristics. The poor sorption and relative persistence of diclofenac and ibuprofen under anaerobic conditions suggest that the two chemicals may pose a high leaching risk when using recycled for irrigation or groundwater replenishment. © 2010 Elsevier Ltd.


Yang Z.,Swinburne University of Technology | Yang Z.,Zhejiang University of Technology | Wang F.,Swinburne University of Technology
New Journal of Chemistry | Year: 2014

The C1s binding energy spectra and total orbital momentum cross sections of small saturated alkanes (up to six carbons) and their isomers are investigated and used to differentiate their structural differences. The present study discovers that the impact of isomerization of alkanes on the carbon core shell is more significant than the elongation of the linear carbon chain. C1s binding energies are capable of serving as excellent indicators for isomers, whereas information on valence space such as valence binding energy spectra and valence momentum distributions is more sensitive to the length of the alkane chains. It further reveals that the terminal carbons exhibit smallest IPs for the alkanes but with a similar chemical environment as all their IPs are in the vicinity of 289.50 eV (±0.45 eV). The largest C1s chemical shift for the isomers is 0.88 eV (neopentane) which is nearly three times larger than the linear alkanes which is 0.30 eV. The inner valence bonding energy spectra clearly show a dependence on the number of carbons with a decreasing HOMO-LOMO energy gap of 9.91 eV for methane but 7.63 eV for hexane. The total momentum distributions are also proportional to the number of electrons but the isomers present small differences in the low momentum region which correspond to the long range in coordinate space. © 2014 The Royal Society of Chemistry and the Centre National de la Recherche Scientifique.


Zhang D.,Zhejiang University of Technology | Wang Q.-G.,National University of Singapore | Yu L.,Zhejiang University of Technology | Shao Q.-K.,Zhejiang University of Technology
IEEE Transactions on Industrial Informatics | Year: 2013

This paper is concerned with the H∞ filtering for networked systems with multiple time-varying transmissions and random packet dropouts. We design a remote H∞ filter for these two networked issues such that the filtering error system is exponentially stable and achieves a prescribed H∞ performance level. A switched system approach is used to model the multiple time-varying transmission process, and a set of stochastic variables are employed to describe the random packet dropout phenomenon. By the switched system theory and some stochastic analysis methods, a sufficient condition for the existence of the H∞ filter is derived in terms of linear matrix inequalities (LMIs). Moreover, the filter gains are determined by solving an optimization problem. Two numerical examples are given to illustrate the effectiveness of the proposed design method. © 2005-2012 IEEE.


Chen S.,Zhejiang University of Technology | Li X.,Beijing Normal University
Computational and Mathematical Methods in Medicine | Year: 2012

Functional magnetic resonance imaging (fMRI) is recently developed and applied to measure the hemodynamic response related to neural activity. The fMRI can not only noninvasively record brain signals without risks of ionising radiation inherent in other scanning methods, such as CT or PET scans, but also record signal from all regions of the brain, unlike EEG/MEG which are biased towards the cortical surface. This paper introduces the fundamental principles and summarizes the research progress of the last year for imaging neural activity in the human brain. Aims of functional analysis of neural activity from fMRI include biological findings, functional connectivity, vision and hearing research, emotional research, neurosurgical planning, pain management, and many others. Besides formulations and basic processing methods, models and strategies of processing technology are introduced, including general linear model, nonlinear model, generative model, spatial pattern analysis, statistical analysis, correlation analysis, and multimodal combination. This paper provides readers the most recent representative contributions in the area. Copyright © 2012 Shengyong Chen and Xiaoli Li.


Liu H.-S.,Zhejiang University of Technology | Lu H.,Beijing Normal University
Journal of High Energy Physics | Year: 2013

We obtain the charged rotating black hole in conformal gravity. The metric is asymptotic to the (anti-)de Sitter spacetime. The contribution to the metric from the charges has a slower falloff than that in the Kerr-Newman AdS black hole. We analyse the global structure and obtain all the thermodynamical quantities including the mass, angular momentum, electric/magnetic charges and their thermodynamical conjugates. We verify that the first law of thermodynamics holds. We also obtain the new neutral rotating black holes that are beyond Einstein metrics. In contrast to the static ones, these rotating black holes have no parameters associated with the massive spin-2 hair. © 2013 SISSA.


Zhang Q.,Zhejiang University of Technology | Gong J.,National University of Singapore
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2016

Superconducting systems such as those modeled by the Kitaev Hamiltonian are found to exhibit Zitterbewegung (ZB) oscillations. Remarkably, the dispersion relation in one-dimensional Kitaev systems allows for wave packets of arbitrary size to undergo nondecaying ZB oscillations without any distortion, with the typical ZB amplitude being one lattice site. To motivate possible experimental interest in this dynamical aspect of superconducting systems, we further show that a certain on-resonance modulation of the Hamiltonian parameter can be exploited to convert ZB oscillations to net drifting of the particle's and hole's wave packet along opposite directions, leading to long-distance particle-hole separation. © 2016 American Physical Society.


Lu X.-M.,China Institute of Technology | Lu P.-Z.,Zhejiang University of Technology | Zhang H.,China Institute of Technology
Applied Microbiology and Biotechnology | Year: 2014

Pyrosequencing-based analysis was used to characterize and compare bacterial communities in manure samples of piglets (GSPM) and adult pigs (GBPM) bred with green feeds without additives, and piglets (ASPM) and adult pigs (ABPM) bred with synthetic feeds containing additives. For each sample, 5,010 effective sequences were selected and utilized to do the bacterial composition analysis, respectively. In total, 1,489, 1,327, 941, and 883 operational taxonomic units were obtained at 5 % distance cutoff in GBPM, GSPM, ABPM, and ASPM, respectively. Bacterial phylotype richness in GBPM was higher than the other samples, and ASPM had the least richness. The most dominant class in the four samples is Bacteroidia. Approximately 41 % sequences in GBPM were affiliated with the Clostridiales order. Campylobacter, Clostridium and Streptococcus genera containing pathogenic bacteria were detected in the four samples. Bacterial diversity and abundance in swine manures varied with piglets, adult pigs, and feeds. In the four samples, higher bacterial diversity but less potentially pathogenic bacterial genera in manures of adult pigs bred with green feeds were found, which indicated that those manures were more suitable for resource utilization. This study also provides evidence for the reasonableness of pig farming with green feeds. © 2013 Springer-Verlag.


Zhang D.,Zhejiang University of Technology | Zhang D.,National University of Singapore | Yu L.,Zhejiang University of Technology | Wang Q.-G.,National University of Singapore | Ong C.-J.,National University of Singapore
IEEE Transactions on Neural Networks and Learning Systems | Year: 2012

This brief deals with the estimator design problem for discrete-time switched neural networks with time-varying delay. One main problem is the asynchronous-mode switching between the neuron state and the estimator. Our goal is to design a mode-dependent estimator for the switched neural networks under average dwell time switching such that the estimation error system is exponentially stable with a prescribed l2 gain (in the H ∞ sense) from the noise signal to the estimation error. A new Lyapunov functional is constructed that may increase during the mismatched switchings. New results on the stability and l2 gain analysis are then obtained. The admissible estimator gains are computed by solving a set of linear matrix inequalities. The relations among the switching law, the maximal delay upper bound, and the optimal H∞ disturbance attenuation level are established. The effectiveness of the proposed design method is finally illustrated by a numerical example. © 2012 IEEE.


Qin L.,Zhejiang University of Technology | Pan X.,Zhejiang University of Technology | Wang L.,Zhejiang University of Technology | Wang L.,China Special Equipment Inspection And Research Institute | And 3 more authors.
Applied Catalysis B: Environmental | Year: 2014

We report a facile impregnation-solvothermal method for the preparation of mesoporous TiO2(B) nanowires (TNWs(B)) supporting with Fe2O3 nanoparticles (NPs). Open tunnel and porous structure of TNWs(B) provided a confined micro-environment for the stabilization of well-dispersed nanoparticles. The intact fibrous morphology structure, high crystallinity and porosity were remained for TNWs(B) after supporting by nanoparticles. UV-visible DRS analysis indicated that the loading of Fe2O3 on TNWs(B) promoted light harvesting ability and further extended the absorption range. The photocatalytic experiments showed that Fe2O3/TNWs(B) had remarkable catalytic activity for photochemical oxidation of organic pollutants Direct Red 4BS in presence of H2O2 and exhibited excellent tolerance with respect to organic matter poisoning, which was attributed to favorable synergetic effect of Fe2O3 NPs and TNWs(B) support. Compared with P25, the composite material taking the advantage of fibrous morphology was more easily separated from reaction system simply by sedimentation. Moreover, the greatest interest of our finding would be exploring that impregnation duration had significant effect on size and location of NPs supported on TNWs(B). When impregnation duration time was higher than 12h, NPs with d<2nm were highly dispersed in porous nanoarchitecture and had positive effect on catalytic performance, which was due to the facilitation of interfacial photo-generated electrons transfer between (001) planes in TiO2(B) and (113) planes of Fe2O3. The high-degree control over size and location of nanoparticles provides valuable insights for understanding relationship between structure and catalytic activity. © 2014 Elsevier B.V.


Liu H.-S.,Zhejiang University of Technology | Lu H.,Beijing Normal University | Pope C.N.,Texas A&M University | Pope C.N.,University of Cambridge
Journal of High Energy Physics | Year: 2014

We study static spherically-symmetric solutions of the Einstein-Proca equations in the presence of a negative cosmological constant. We show that the theory admits solutions describing both black holes and also solitons in an asymptotically AdS background. Interesting subtleties can arise in the computation of the mass of the solutions and also in the derivation of the first law of thermodynamics. We make use of holographic renormalisation in order to calculate the mass, even in cases where the solutions have a rather slow approach to the asymptotic AdS geometry. By using the procedure developed by Wald, we derive the first law of thermodynamics for the black hole and soliton solutions. This includes a non-trivial contribution associated with the Proca "charge". The solutions cannot be found analytically, and so we make use of numerical integration techniques to demonstrate their existence. © 2014 The Author(s).


Liu H.-S.,Zhejiang University of Technology | Lu H.,Beijing Normal University
Journal of High Energy Physics | Year: 2014

We consider the subset of gauged maximal supergravities that consists of the SO(n + 1) gauge fields Aij and the scalar deformation T ij of the Sn in the spherical reduction of M-theory or type IIB. We focus on the Abelian Cartan subgroup and the diagonal entries of Tij . The resulting theories can be viewed as the STU models with additional hyperscalars. We find that the theories with only one or two such vectors can be generalized naturally to arbitrary dimensions. The same is true for the D = 4 or 5 Einstein- Maxwell theory with such a hyperscalar. The gauge fields become massive, determined by stationary points of the hyperscalars a la the analogous Abelian Higgs mechanism. We obtain classes of Lifshitz and Schrö;dinger vacua in these theories. The scaling exponent z turns out to be rather restricted, taking fractional or irrational numbers. Tweaking the theories by relaxing the mass parameter or making a small change of the superpotential, we find that solutions with z = 2 can emerge. In a different application, we find that the resolution of superstar singularity in the STU models by using bubbling-AdS solitons can be generalized to arbitrary dimensions in our theories. In particular, we obtain the smooth AdS solitons that can be viewed as the resolution of the Reissner-Nordstrøm superstars in general dimensions. © 2014 The Authors.


Liu H.-S.,Zhejiang University of Technology | Lu H.,Beijing Normal University
Journal of High Energy Physics | Year: 2014

Abstract: We specialize the Wald formalism to derive the thermodynamical first law for static black holes with spherical/torus/hyperbolic symmetries in a variety of supergravities or supergravity-inspired theories involving multiple scalars and vectors. We apply the formula to study the first law of a general class of Lifshitz black holes. We analyse the first law of three exact Lifshitz black holes and the results fit the general pattern. In one example, the first law is TdS + ΦdQ = 0 where (Φ, Q) are the electric potential and charge of the Maxwell field. The unusual vanishing of mass in this specific solution demonstrates that super-extremal charged black holes can exist in asymptotic Lifshitz spacetimes. © 2014, The Author(s).


Liang H.,Peking University | Sun W.,Peking University | Jin X.,Peking University | Li H.,Peking University | And 4 more authors.
Angewandte Chemie - International Edition | Year: 2011

Pores for thought: The pore size and pore shape (including "rectangular", triangular, tetragonal, diamond, pentagonal, and hexagonal) in binary molecular porous networks formed by trimesic acid (TMA) and 4,4′-bis(4-pyridyl)biphenyl (BPBP) molecules on Au(111) is tuned simply through changing the TMA:BPBP ratio (see picture). Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Li M.,East China Normal University | Zhao W.,University of Macau | Chen S.,Zhejiang University of Technology
Mathematical Problems in Engineering | Year: 2011

Scaling phenomena of the Internet traffic gain peoples interests, ranging from computer scientists to statisticians. There are two types of scales. One is small-time scaling and the other large-time one. Tools to separately describe them are desired in computer communications, such as performance analysis of network systems. Conventional tools, such as the standard fractional Brownian motion (fBm), or its increment process, or the standard multifractional fBm (mBm) indexed by the local Hlder function H(t) may not be enough for this purpose. In this paper, we propose to describe the local scaling of traffic by using D(t) on a point-by-point basis and to measure the large-time scaling of traffic by using E [H(t) ] on an interval-by-interval basis, where E implies the expectation operator. Since E [H(t) ] is a constant within an observation interval while D(t) is random in general, they are uncorrelated with each other. Thus, our proposed method can be used to separately characterize the small-time scaling phenomenon and the large one of traffic, providing a new tool to investigate the scaling phenomena of traffic. © 2011 Ming Li et al.


Song X.C.,Fujian Normal University | Zheng Y.F.,Zhejiang University of Technology | Yin H.Y.,Hangzhou Dianzi University
Journal of Nanoparticle Research | Year: 2013

The Fe3O4 nanoparticles doped with cobalt ions have been successfully synthesized by the co-precipitation process. The X-ray diffraction, inductively coupled plasma, scanning electron microscopy, and transmission electron microscopy were used to characterize the as-prepared nanoparticles. The results show that the phase structure of the nanoparticles is spinel structure of pure Fe3O4 with the particle size ranging from 40 to 50 nm. The Co-doping concentration can be controlled by changing the atomic ratio of the stock materials. The catalytic activity of the Co-doped Fe3O4 was further investigated by decomposing the phenol in liquid phase. The results show that cobalt ions doping can improve the catalytic efficiency of Fe3O4 nanoparticles in phenol degradation with catalytic reaction fitting the first-order kinetics. According to the estimated reaction rate of Co-doped Fe3O4 nanoparticles at different temperatures, the activation energy was calculated to be 45.63 kJ/mol. © 2013 Springer Science+Business Media Dordrecht.


Zhang H.,Zhejiang University of Technology | Lin K.,Zhejiang University of Technology | Lin K.,University of California at Riverside | Wang H.,Scion Research | Gan J.,University of California at Riverside
Environmental Pollution | Year: 2010

Biochars are anthropogenic carbonaceous sorbent and their influences on the sorption of environmental contaminants need to be characterized. Here we evaluated the effect of Pinus radiata derived biochars on soil sorption and desorption of phenanthrene. Two biochars separately produced at 350 °C and 700 °C and three soils were tested. Biochar amendment generally enhanced the soil sorption of phenanthrene. The biochar produced at 700 °C generally showed a greater ability at enhancing a soil's sorption ability than that prepared at 350 °C. The single-step desorption measurement showed an apparent hysteresis in biochar-amended soils. After 28 d equilibration, the sorptive capacity of biochar-amended soil (with an organic carbon content of 0.16%) significantly decreased. This study clearly suggested that biochar application enhanced soil sorption of hydrophobic organic compounds, but the magnitude of enhancement depended on the preparation of biochars, the indigenous soil organic carbon levels, and the contact time between soil and biochar. © 2010 Elsevier Ltd. All rights reserved.


Su Y.,National University of Singapore | Ge J.,National University of Singapore | Zhu B.,National University of Singapore | Zheng Y.-G.,Zhejiang University of Technology | And 2 more authors.
Current Opinion in Chemical Biology | Year: 2013

The identification of potential cellular targets of small molecules is important in biomedical research and drug discovery, but has been challenging due to a lack of proteome-based methods that enable direct investigation of small molecule-protein interaction in live cells. This review summarizes some of the recent advances in target identification of bioactive molecules (including drugs and natural products) using in situ methods for cell-based proteome profiling of potential on and off targets. © 2013 Elsevier Ltd.


Ho T.-T.,National Chung Hsing University | Chen C.-Y.,National Chung Hsing University | Li Z.-G.,National Chung Hsing University | Li Z.-G.,Zhejiang University of Technology | And 2 more authors.
Analytica Chimica Acta | Year: 2012

A new microextraction technique based on ionic liquid solid-phase microextraction (IL-SPME) was developed for determination of trace chlorophenols (CPs) in landfill leachate. The synthesized ionic liquid, 1-butyl-3-methylimidazolium hexafluorophosphate ([C 4MIM][PF 6]), was coated onto the spent fiber of SPME for extraction of trace CPs. After extraction, the absorbed analytes were desorbed and quantified using gas chromatography-mass spectrometry (GC/MS). The term of the proposed method is as ionic liquid-coated of solid-phase microextraction combined with gas chromatography-mass spectrometry (IL-SPME-GC/MS). No carryover effect was found, and every laboratory-made ionic liquids-coated-fiber could be used for extraction at least eighty times without degradation of efficiency. The chlorophenols studied were 2,4-dichlorophenol (2,4-DP), 2,4,6-trichlorophenol (2,4,6-TCP), 2,3,4,6-tetrachlorophenol (2,3,4,6-TeCP), and pentachlorophenol (PCP). The best results of chlorophenols analysis were obtained with landfill leachate at pH 2, headspace extraction for 4min, and thermal desorption with the gas chromatograph injector at 240°C for 4min. Linearity was observed from 0.1 to 1000μgL -1 with relative standard deviations (RSD) less than 7% and recoveries were over 87%. The limit of detection (LOD) for pentachlorophenol was 0.008μgL -1. The proposed method was tested by analyzing landfill leachate from a sewage farm. The concentrations of chlorophenols were detected to range from 1.1 to 1.4μgL -1. The results demonstrate that the IL-SPME-GC/MS method is highly effective in analyzing trace chlorophenols in landfill leachate. © 2011 Elsevier B.V.


Lin K.,Zhejiang University of Technology | Bondarenko S.,University of California at Riverside | Gan J.,University of California at Riverside
Journal of Soils and Sediments | Year: 2011

Purpose: Although the ubiquity of pharmaceuticals in treated wastewater has now been well documented, their fate and risk during beneficial wastewater reuse are far less understood. Soil sorption and degradation are important processes affecting the leaching potential of trace contaminants in irrigated soil. To this end, we examined the sorption and attenuation of six psychoactive and antilipidemic drugs, i. e., carbamazepine, diazepam, Dilantin, meprobamate, primidone, and gemfibrozil, in a loam (LVL) and a loamy sand representative of golf course soils in the southwestern United States. Materials and methods: Sorption of pharmaceuticals in the soils was measured using a batch equilibrium method at room temperature. Degradation experiments were carried out under aerobic and anaerobic conditions. Pharmaceutical residues in soil samples were extracted and analyzed by LC/MS/MS. Results and discussion: Except for diazepam in both soils and carbamazepine in LVL soil, sorption was mostly negligible for all other compound-soil combinations (Kd = 0-2. 5 L/kg). For the same soil, the sorption affinity generally followed a decreasing order diazepam > carbamazepine > gemfibrozil > Dilantin ≈ meprobamate ≈ primidone. While Dilantin, gemfibrozil, and meprobamate showed moderate persistence in the soils under aerobic conditions, with T1/2 27-99 days, the test compounds were recalcitrant to degradation in the other treatments. Conclusions: The low sorption affinity and long persistence suggest that some of the wastewater-borne pharmaceutical compounds may be easily mobile with groundwater flow and pose groundwater contamination risks when the treated wastewater is dispersed in the environment through practices such as landscape irrigation. © 2011 Springer-Verlag.


Zhang D.,Zhejiang University of Technology | Zhang D.,Nanyang Technological University | Cai W.,Nanyang Technological University | Wang Q.-G.,National University of Singapore
Neurocomputing | Year: 2014

This paper is concerned with the mixed H∞ and passivity based state estimation for a class of discrete-time fuzzy neural networks with the estimator gain change, where a discrete-time homogeneous Markov chain taking value in a finite set Γ={0, 1} is introduced to model this phenomenon. Based on the Markovian system approach and linear matrix inequality technique, a new sufficient condition has been derived such that the estimation error system is exponentially stable in the mean square sense and achieves a prescribed mixed H∞ and passivity performance level. The estimator parameter is then determined by solving a set of linear matrix inequalities (LMIs). A numerical example is presented to show the effectiveness of the proposed design method. © 2014 Elsevier B.V.


Liu H.-S.,Zhejiang University of Technology | Liu H.-S.,Zhejiang University | Lu H.,Beijing Normal University
European Physical Journal C | Year: 2012

We obtain the Schrödinger and general pp-wave solutions with or without the massive vector in Einstein-Weyl supergravity. The vector is an auxiliary field in the off-shell supermultiplet and it acquires a kinetic term in the Weyl-squared super invariant. We study the supersymmetry of these solutions and find that turning on the massive vector has the consequence of breaking all the supersymmetry. The Schrödinger and also the pp-wave solutions with the massive vector turned off on the other hand preserve a quarter of the supersymmetry. © 2012 Springer-Verlag / Società Italiana di Fisica.


Hu H.,Zhejiang University of Technology | Yu L.,Zhejiang University of Technology | Chen G.,Zhejiang University of Technology | Xie G.,Peking University
International Journal of Control, Automation and Systems | Year: 2013

This paper addresses a consensus problem for second-order agents with unknown but bounded (UBB for short) disturbance which may affect the measure of neighbors' velocities. In this study, the communication topology of the multi-agent system is supposed to be connected. In order to solve this consensus problem, a new velocity estimation called distributed lazy rule is firstly proposed, where each agent can estimate its neighbors' velocities one by one. Then, a group of sufficient conditions for this second-order consensus problem are presented by adopting graph theory and the well-known Barbalat lemma, and the bounded consensus protocol is taken into account due to actuator saturation. Theoretically, the group of agents can reach consensus under the proposed control protocol, which is also validated by some numerical experiments. © 2013 Institute of Control, Robotics and Systems and The Korean Institute of Electrical Engineers and Springer-Verlag Berlin Heidelberg.


Lin K.,Zhejiang University of Technology | Yan C.,Zhejiang University of Technology | Gan J.,University of California at Riverside
Environmental Science and Technology | Year: 2014

Hydroxylated polybrominated diphenyl ethers (OH-PBDEs) are of significant concern because of their enhanced toxicological effects compared to PBDEs. Research to date has attributed the origin of OH-PBDEs to biological metabolism of PBDEs and natural production in the environment. However, it is unclear how OH-PBDEs are formed naturally. In this study, we explored the formation of OH-PBDEs via the oxidative transformation of simple bromophenols (BPs, e.g., 4-BP, 2,4-DBP, and 2,4,6-TBP) by birnessite (δ-MnO2). Results showed that OH-PBDEs were readily produced by δ-MnO2 with BPs as precursors. For example, oxidation of 2,4-DBP by δ-MnO2 yielded 2′-OH-BDE-68 and 2′,5′-OH-BDE-25. Other OH-PBDEs, such as 6-OH-BDE-13, 2′,5′-OH-BDE-3, 4′-OH-BDE-121, and 2′,5′-OH-BDE-69, were detected from the reaction with 4-BP and 2,4,6-TBP. The formation of OH-PBDEs likely resulted from the oxidative coupling of bromophenoxy radicals. Mild acidic conditions enhanced while coexisting cations (e.g., Na+, Mg2+, and Ca2+) suppressed the transformation. Given the ubiquity of BPs and δ-MnO2, oxidation of BPs by δ-MnO2 and other metal oxides is likely an abiotic route for the formation of OH-PBDEs in the environment. © 2013 American Chemical Society.


Li L.,National University of Singapore | Zhang C.-W.,National Neuroscience Institute | Chen G.Y.,National University of Singapore | Zhu B.,National University of Singapore | And 6 more authors.
Nature communications | Year: 2014

The unusually high MAO-B activity consistently observed in Parkinson's disease (PD) patients has been proposed as a biomarker; however, this has not been realized due to the lack of probes suitable for MAO-B-specific detection in live cells/tissues. Here we report the first two-photon, small molecule fluorogenic probe (U1) that enables highly sensitive/specific and real-time imaging of endogenous MAO-B activities across biological samples. We also used U1 to confirm the reported inverse relationship between parkin and MAO-B in PD models. With no apparent toxicity, U1 may be used to monitor MAO-B activities in small animals during disease development. In clinical samples, we find elevated MAO-B activities only in B lymphocytes (not in fibroblasts), hinting that MAO-B activity in peripheral blood cells might be an accessible biomarker for rapid detection of PD. Our results provide important starting points for using small molecule imaging techniques to explore MAO-B at the organism level.


Chen T.,Zhejiang University of Technology | Zhang X.,Zhejiang University of Technology | Jin S.,Peking University | Kim O.,Peking University
Expert Systems with Applications | Year: 2014

In order to achieve high efficiency of classification in intrusion detection, a compressed model is proposed in this paper which combines horizontal compression with vertical compression. OneR is utilized as horizontal compression for attribute reduction, and affinity propagation is employed as vertical compression to select small representative exemplars from large training data. As to be able to computationally compress the larger volume of training data with scalability, MapReduce based parallelization approach is then implemented and evaluated for each step of the model compression process abovementioned, on which common but efficient classification methods can be directly used. Experimental application study on two publicly available datasets of intrusion detection, KDD99 and CMDC2012, demonstrates that the classification using the compressed model proposed can effectively speed up the detection procedure at up to 184 times, most importantly at the cost of a minimal accuracy difference with less than 1% on average. © 2014 Elsevier B.V. All rights reserved.


Kong D.,Zhejiang University of Technology | Lei T.,Zhejiang University of Technology | Zheng J.,Zhejiang University of Technology | Ma C.,Zhejiang University of Technology | Jiang J.,Hangzhou Construction and Building Materials Co.
Construction and Building Materials | Year: 2010

A novel triple mixing method (TM) was developed to realize surface-coating of aggregate with pozzalanics materials for further improving microstructure of interfacial transition zone (ITZ) and properties of recycled aggregate concrete (RAC). Effects of mixing method and coating by various admixtures on compressive strength and chloride ions penetration resistance of RAC were investigated. Through preparing the new-old-new concrete sandwich specimen and SEM observation of the old concrete surface after fracture, effect of surface-coating of the recycled aggregate (RA) in RAC with various admixtures on ITZ microstructure was also studied. The results showed that properties of RAC can be further enhanced by using TM, as compared to that of using the double-mixing method (DM). Through SEM observation, it is revealed that the coated pozzalanic particles can consume CH accumulated in the pores and on the surface of the attached mortar to form new hydration products, which can not only in situ strengthen the RA, but further improve the microstructure of the ITZ, thus the strength and durability of the RAC was further enhanced. © 2009 Elsevier Ltd. All rights reserved.


Zhu T.,Zhejiang University of Technology | Shu F.-W.,Chongqing University of Posts and Telecommunications | Wu Q.,Zhejiang University of Technology | Wang A.,Zhejiang University of Technology | Wang A.,Baylor University
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2012

We consider an extended theory of Horava-Lifshitz gravity with the detailed balance condition softly breaking, but without the projectability condition. With the former, the number of independent coupling constants is significantly reduced. With the latter and by extending the original foliation-preserving diffeomorphism symmetry Diff(M,F) to include a local U(1) symmetry, the spin-0 gravitons are eliminated. Thus, all the problems related to them disappear, including the instability, strong coupling, and different speeds in the gravitational sector. When the theory couples to a scalar field, we find that the scalar field is not only stable in both the ultraviolet and infrared, but also free of the strong coupling problem, because of the presence of high-order spatial derivative terms of the scalar field. Furthermore, applying the theory to cosmology, we find that due to the additional U(1) symmetry, the Friedmann-Robertson-Walker (FRW) universe is necessarily flat. We also investigate the scalar, vector, and tensor perturbations of the flat FRW universe, and derive the general linearized field equations for each kind of the perturbations. © 2012 American Physical Society.


Yuan M.,Zhejiang Sci-Tech University | Liu A.,Zhejiang Sci-Tech University | Liu A.,Zhejiang University of Technology | Zhao M.,Zhejiang Sci-Tech University | And 4 more authors.
Sensors and Actuators, B: Chemical | Year: 2014

A bimetallic PdCu nanoparticle (NP) decorated three-dimensional graphene hydrogel (PdCu/GE) was developed by a simple one-step hydrothermal method. The PdCu/GE hybrids exhibited an interconnected microporous framework with PdCu NPs dispersed and encapsulated within the GE layers. The PdCu/GE hybrids showed significant electrocatalytic activity toward glucose oxidation due to the synergistic effect of PdCu NPs and GE sheets in the alkaline solution containing chloride ions, presenting a substantial increase in the oxidation current and decrease in the onset potential of oxidation compared to the monometallic modified GE hybrids. At an applied potential of -0.4 V, the PdCu/GE modified electrode with optimized bimetallic ratio presented quick respond to glucose oxidation with a wide linear range up to 18 mM and a reproducible sensitivity of 48 μA (mg mM)-1 in the presence of chloride ions. Furthermore, the PdCu/GE modified electrode exhibited high selectivity to glucose and resistance against poisoning by commonly interfering species such as dopamine, ascorbic acid, uric acid, acetamidophenol and some monosaccharides. The PdCu/GE hybrid hydrogels with 3D micropores were therefore promising for the future development of non-enzymatic amperometric glucose sensors with improved electrochemical performances. © 2013 Elsevier B.V.


Ma Z.,Shanghai JiaoTong University | Ma Z.,University College London | Chen Z.,Zhejiang University of Technology | Fanchini F.F.,São Paulo State University
New Journal of Physics | Year: 2013

In this paper, we present a measure of quantum correlation for a multipartite system, defined as the sum of the correlations for all possible partitions. Our measure can be defined for quantum discord (QD), geometric quantum discord or even for entanglement of formation (EOF). For tripartite pure states, we show that the multipartite measures for the QD and the EOF are equivalent, which allows direct comparison of the distribution and the robustness of these correlations in open quantum systems. We study dissipative dynamics for two distinct families of entanglement: a W state and a GHZ state. We show that, for the W state, the QD is more robust than the entanglement, while for the GHZ state, this is not true. It turns out that the initial genuine multipartite entanglement present in the GHZ state makes the EOF more robust than the QD. © IOP Publishing and Deutsche Physikalische Gesellschaft.


Xia S.-J.,Zhejiang University of Technology | Zhou X.-B.,University of Maine, United States | Shi W.,Zhejiang University of Technology | Pan G.-X.,Huzhou Teachers College | Ni Z.-M.,Zhejiang University of Technology
Journal of Molecular Catalysis A: Chemical | Year: 2014

Three transition metal oxides (Fe3O4, CeO2 and SnO2) modified Zn/Ti-layered double hydroxides (LDHs) were successfully synthesized. These materials were characterized by powder X-ray diffraction (XRD), inductively coupled plasma atomic emission spectrometry (ICP-AES), Brunauer-Emmett-Teller (BET) and UV-vis diffuse reflectance spectrum (UV-vis) for the purpose of confirming the formation of good crystal structure. Comparing with original layered double hydroxides, the transition metal oxides modified Zn/Ti layered double hydroxide materials show narrower band gap, larger surface area, smaller pore volume, pore size distribution, and higher removal efficiency for acid red 14 under visible light. The decomposition efficiency of acid red 14 was all over 92% after 120 min. In addition, the thermal regeneration for re-use of layered double hydroxide materials after photodegradation was feasible for at least four cycles (degradation amount still all over 80%). Furthermore, the kinetic parameters, intermediates and possible photocatalytic pathways for acid red 14 decomposed by these transition metal oxides modified Zn/Ti layered double hydroxide materials were also investigated carefully. © 2014 Elsevier B.V.


Yao C.,University of Science and Arts of Iran | Yao C.,University College London | Ma Z.-H.,Shanghai JiaoTong University | Chen Z.-H.,Zhejiang University of Technology | Serafini A.,University College London
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2012

We propose a robust and efficient approach for tripartite-to-bipartite entanglement localization. By using weak measurements and quantum measurement reversal, an almost maximal entangled state shared by two parties can be generated with the assistance of the third party by local quantum operations and classical communication from a W-like state. We show that this approach works well in the presence of losses and phase diffusion. Our method provides an active way to fight against decoherence, and might help for quantum communication and distributed quantum computation. © 2012 American Physical Society.


Mao J.,Zhejiang University of Technology | Mao J.,Shanghai JiaoTong University | Bao S.,Zhejiang University of Technology
International Journal of Mechanical Sciences | Year: 2015

In this study, buckling behaviors of T joint and pipe are comparatively investigated by varying geometric parameters and analysis methods. The effects of the wall thickness and ellipticity on buckling behavior are taken into account. According to the lowest potential energy principle, the equations of critical pressure and buckling wave number are established on the assumption of elastic buckling in the paper. However, in practice, if the structures deform largely, the T joint and pipe always experience elastic-plastic buckling, so the geometric and material nonlinearities are considered in buckling calculation. In achieving it, the finite element method (FEM) is adopted to explore the effects of those nonlinearities on buckling. Moreover, the effects of initial defect on the critical pressure are elucidated on the object of the T joint and pipe. Through rigorous FE numerical analysis, the buckling behaviors of the T joint and pipe are discussed in terms of deformation pattern, stress distribution, and critical pressure. Some interesting and useful conclusions are summarized in the paper. © 2014 Elsevier Ltd. All rights reserved.


Qian J.,Zhejiang University of Technology | Jiang L.,Zhejiang University of Technology | Cai F.,Zhejiang University of Technology | Wang D.,Zhejiang University of Technology | And 2 more authors.
Biomaterials | Year: 2011

Gold nanorods (GNRs) have been widely used for bio-imaging. However, GNRs assisted optical in vivo deep tissue imaging is severely restricted due to signal attenuation, low contrast, complex process or low real-timing. To overcome these problems, we functionalized GNRs with both near-infrared (NIR) fluorescence and surface enhanced Raman scattering (SERS) and utilized these co-functionalized GNRs for purely optical in vivo imaging of live mice. Our proposed technology has the combined advantages of high real-timing, high imaging contrast and deep detection ability. The distribution and excretion of intravenously injected GNRs in deep tissues of live mice were observed in vivo for the first time through purely optical imaging. We also demonstrated successfully in vivo biomedical applications of the co-functionalized GNRs to sentinel lymph node (SLN) mapping and tumor targeting of mice. The present technology has great future potentials for disease diagnosis and clinical therapies. © 2010 Elsevier Ltd.


Zhang C.-Y.,Shanghai JiaoTong University | Zhang S.-J.,Zhejiang University of Technology | Zou D.-C.,Yangzhou University | Wang B.,Shanghai JiaoTong University
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2016

We study the charged scalar collapse in de Sitter spacetimes. With the electric charge, there is one more competitor to join the competition of dynamics in the gravitational collapse. We find that two factors can influence the electric charge. If we just adjust the charge conjugation, the electric charge effect is always perturbative at the black hole threshold. The electric charge can also be influenced by the initial conditions of perturbations. These initial parameters can be tuned to control the competition in dynamics and present us new and rich physics in the process of gravitational collapse. We give physical explanations of these phenomena found in dynamics. Furthermore we show that the properties of the gravitational collapse we observed do not depend on spacetime dimensions. © 2016 American Physical Society.


Zhu T.,Zhejiang University of Technology | Wu Q.,Zhejiang University of Technology | Wang A.,Zhejiang University of Technology | Wang A.,Baylor University | Shu F.-W.,Chongqing University of Posts and Telecommunications
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2011

In this paper, we show that the spin-0 gravitons appearing in Horava-Lifshitz gravity without the projectability condition can be eliminated by extending the gauge symmetries of the foliation-preserving diffeomorphisms to include a local U(1) symmetry. As a result, the problems of stability, ghosts, strong coupling, and different speeds in the gravitational sector are automatically resolved. In addition, with the detailed balance condition softly breaking, the number of independent coupling constants can be significantly reduced (from more than 70 down to 15), while the theory is still UV complete and possesses a healthy IR limit, whereby the prediction powers of the theory are considerably improved. The strong coupling problem in the matter sector can be cured by introducing an energy scale M*, so that M *<Λω, where M* denotes the suppression energy of high-order derivative terms, and Λω the would-be strong coupling energy scale. © 2011 American Physical Society.


Ma Z.-H.,Shanghai JiaoTong University | Chen Z.-H.,Zhejiang University of Technology | Chen J.-L.,Nankai University | Spengler C.,University of Vienna | And 2 more authors.
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2011

We introduce an intuitive measure of genuine multipartite entanglement, which is based on the well-known concurrence. We show how lower bounds on this measure can be derived and also meet important characteristics of an entanglement measure. These lower bounds are experimentally implementable in a feasible way enabling quantification of multipartite entanglement in a broad variety of cases. © 2011 American Physical Society.


Zhao D.,China University of Petroleum - East China | Zou T.,Zhejiang University of Technology | Li S.,Shanghai JiaoTong University | Zhu Q.,China University of Petroleum - East China | Zhu Q.,University of the West of England
IET Control Theory and Applications | Year: 2012

Facing the critical challenge in coordination control and uncertainty encountered in leader-follower multi-agent systems, this study proposes a new adaptive backstepping sliding mode control approach in light of integration of the advantages of backstepping and sliding mode control principles. A systematic controller design procedure is proposed with step-by-step implement details. Correspondingly, the stability analysis is presented to lay a foundation for analytical understanding in generic theoretical aspects and safe operation in real systems. Two simulated examples are selected to bench test the effectiveness and efficiency of the proposed approach. © 2012 The Institution of Engineering and Technology.


Chen Z.-H.,Zhejiang University of Technology | Ma Z.-H.,Shanghai JiaoTong University | Guhne O.,University of Siegen | Severini S.,University College London
Physical Review Letters | Year: 2012

Entanglement monotones, such as the concurrence, are useful tools to characterize quantum correlations in various physical systems. The computation of the concurrence involves, however, difficult optimizations and only for the simplest case of two qubits a closed formula was found by Wootters. We show how this approach can be generalized, resulting in lower bounds on the concurrence for higher dimensional systems as well as for multipartite systems. We demonstrate that for certain families of states our results constitute the strongest bipartite entanglement criterion so far; moreover, they allow us to recognize novel families of multiparticle bound entangled states. © 2012 American Physical Society.


Yu W.H.,Zhejiang University of Technology | Li N.,Zhejiang University of Technology | Tong D.S.,Zhejiang University of Technology | Zhou C.H.,Zhejiang University of Technology | And 2 more authors.
Applied Clay Science | Year: 2013

The understanding of adsorption of proteins and nucleic acids on clay minerals and their interactions is important in biological applications for soil ecosystem, the earth's biochemical evolution and origin of life, delivery of drug, etc. This review summarizes adsorption of proteins and nucleic acids (DNA, RNA) on natural clay minerals of layer phyllosilicates such as montmorillonite, kaolinite and illite and their interactions. Recent advances in adsorption mechanisms, adsorption sites and effect of various factors on adsorption are discussed. The interaction mechanisms are suggested to be cation exchange, electrostatic interactions, hydrophobic/hydrophilic interactions, ligand exchange, cation bridge, water bridge, hydrogen bond and van der Waals forces. The physical and chemical characteristics of clay minerals and proteins and nucleic acids are mainly responsible for the absorption of these biomolecules by clay minerals besides external conditions, for instance pH and ion strength of absorption solution. Finally, comments on the perspectives and potential benefits of the studies on adsorption of proteins and nucleic acids on clay minerals and their interactions are also made. © 2013 Elsevier B.V.


Zou T.,Zhejiang University of Technology | Li S.,Shanghai JiaoTong University
Journal of the Franklin Institute | Year: 2011

This paper studies stabilization of the TakagiSugeno fuzzy system with input and state constraints and bounded noise. The technique of extended nonquadratic boundedness is proposed based on the existing quadratic boundedness. Under the non-parallel distributed compensation law, the state of the closed-loop system is stabilizing to a neighborhood of the origin specified via an extended nonquadratic Lyapunov function. The existing technique for relaxing the linear matrix inequality conditions can be properly applied to obtain computationally tractable stability conditions. A simulation example is given to show the effectiveness of the controller. © 2011 The Franklin Institute © 2011 Published by Elsevier Ltd. on behalf of The Franklin Institute. All rights reserved.


Lu Y.,University of Illinois at Urbana - Champaign | Ye X.,University of Illinois at Urbana - Champaign | Zhang Z.,University of Illinois at Urbana - Champaign | Zhang Z.,Zhejiang University of Technology | And 2 more authors.
Energy Procedia | Year: 2011

An Integrated Vacuum Carbonate Absorption Process (IVCAP) for post-combustion carbon dioxide (CO2) capture is described. IVCAP employs potassium carbonate (PC) as a solvent, uses waste or low quality steam from the power plant for CO2 stripping, and employs a biocatalyst, carbonic anhydrase (CA) enzyme, for promoting the CO2 absorption into PC solution. A series of experiments were performed to evaluate the activity of CA enzyme mixed in PC solutions in a stirred tank reactor system under various temperatures, CA dosages, CO2 loadings, CO2 partial pressures, and the presence of major flue gas contaminants. It was demonstrated that CA enzyme is an effective biocatalyst for CO2 absorption under IVCAP conditions. © 2011 Published by Elsevier Ltd.


Bai L.,Jilin University | Wang Z.,Jilin University | Shao Y.-H.,Zhejiang University of Technology | Deng N.-Y.,China Agricultural University
Knowledge-Based Systems | Year: 2014

Both support vector machine (SVM) and twin support vector machine (TWSVM) are powerful classification tools. However, in contrast to many SVM-based feature selection methods, TWSVM has not any corresponding one due to its different mechanism up to now. In this paper, we propose a feature selection method based on TWSVM, called FTSVM. It is interesting because of the advantages of TWSVM in many cases. Our FTSVM is quite different from the SVM-based feature selection methods. In fact, linear SVM constructs a single separating hyperplane which corresponds a single weight for each feature, whereas linear TWSVM constructs two fitting hyperplanes which corresponds to two weights for each feature. In our linear FTSVM, in order to link these two fitting hyperplanes, a feature selection matrix is introduced. Thus, the feature selection becomes to find an optimal matrix, leading to solve a multi-objective mixed-integer programming problem by a greedy algorithm. In addition, the linear FTSVM has been extended to the nonlinear case. Furthermore, a feature ranking strategy based on FTSVM is also suggested. The experimental results on several public available benchmark datasets indicate that our FTSVM not only gives nice feature selection on both linear and nonlinear cases but also improves the performance of TWSVM efficiently. © 2014 Elsevier B.V. All rights reserved.


Shao Y.-H.,Zhejiang University of Technology | Deng N.-Y.,China Agricultural University
Neural Networks | Year: 2012

Twin support vector machines (TWSVMs) obtain faster learning speed by solving a pair of smaller SVM-type problems. In order to increase its efficiency further, this paper presents a coordinate descent margin based twin vector machine (CDMTSVM) compared with the original TWSVM. The major advantages of CDMTSVM lie in two aspects: (1) The primal and dual problems are reformulated and improved by adding a regularization term in the primal problems which implies maximizing the "margin" between the proximal hyperplane and bounding hyperplane, yielding the dual problems to be stable positive definite quadratic programming problems. (2) A novel coordinate descent method is proposed for our dual problems which leads to very fast training. As our coordinate descent method handles one data point at a time, it can process very large datasets that need not reside in memory. Our experiments on publicly available datasets indicate that our CDMTSVM is not only fast, but also shows good generalization performance. © 2011 Elsevier Ltd.


Chen S.,Zhejiang University of Technology | Wang Y.,Zhejiang University of Technology | Cattani C.,University of Salerno
Mathematical Problems in Engineering | Year: 2012

Construction of three-dimensional structures from video sequences has wide applications for intelligent video analysis. This paper summarizes the key issues of the theory and surveys the recent advances in the state of the art. Reconstruction of a scene object from video sequences often takes the basic principle of structure from motion with an uncalibrated camera. This paper lists the typical strategies and summarizes the typical solutions or algorithms for modeling of complex three-dimensional structures. Open difficult problems are also suggested for further study. Copyright © 2012 Shengyong Chen et al.


Wang D.,Zhejiang University of Technology | Wang D.,Beijing University of Chemical Technology | Qian J.,Zhejiang University of Technology | Qin W.,Hong Kong University of Science and Technology | And 4 more authors.
Scientific Reports | Year: 2014

Bioimaging systems with cytocompatibility, photostability, red fluorescence, and optical nonlinearity are in great demand. Herein we report such a bioimaging system. Integration of tetraphenylethene (T), triphenylamine (T), and fumaronitrile (F) units yielded adduct TTF with aggregation-induced emission (AIE). Nanodots of the AIE fluorogen with efficient red emission were fabricated by encapsulating TTF with phospholipid. The AIE dots enabled three-dimensional dynamic imaging with high resolution in blood vessels of mouse brain under two-photon excitation.


Feng J.,Zhejiang University of Technology | Qin Z.,Zhejiang University of Technology | Yao S.,Hong Kong University of Science and Technology
Langmuir | Year: 2012

The coalescence-induced condensate drop motion on some superhydrophobic surfaces (SHSs) has attracted increasing attention because of its potential applications in sustained dropwise condensation, water collection, anti-icing, and anticorrosion. However, an investigation of the mechanism of such self-propelled motion including the factors for designing such SHSs is still limited. In this article, we fabricated a series of superhydrophobic copper surfaces with nanoribbon structures using wet chemical oxidation followed by fluorization treatment. We then systematically studied the influence of surface roughness and the chemical properties of as-prepared surfaces on the spontaneous motion of condensate drops. We quantified the "frequency" of the condensate drop motion based on microscopic sequential images and showed that the trend of this frequency varied with the nanoribbon structure and extent of fluorination. More obvious spontaneous condensate drop motion was observed on surfaces with a higher extent of fluorization and nanostructures possessing sufficiently narrow spacing and higher perpendicularity. We attribute this enhanced drop mobility to the stable Cassie state of condensate drops in the dynamic dropwise condensation process that is determined by the nanoscale morphology and local surface energy. © 2012 American Chemical Society.


Meng X.,Zhejiang University of Technology | Pan Q.,China Agricultural University | Liu Y.,Beijing University of Chemical Technology
European Food Research and Technology | Year: 2012

In order to enhance the solubility and bioavailability of phytosterols (PS), cyclodextrin-PS (CD-PS) inclusion complexes were prepared and the properties of PS-β-cyclodextrin (PS-β-CD) and the inclusion mechanism of its derivative hydroxypropyl β-cyclodextrin (PS-HP-β-CD) in solution were also evaluated. The effects of crucial parameters on cyclodextrin-sterol inclusion efficiency were optimized, including solvent type, β-CD/PS molar ratio, temperature, PS content and reaction time; 92-98 % inclusion efficiency was achieved under the conditions of HP-β-CD/PS ratio 3:1-4:1, PS concentration 15-20 mM, temperature 50-55 °C, reaction time 12 h. For β-CD host, butanol was a good solvent for PS inclusion reaction. The properties of CD-PS inclusion complexes were characterized by differential scanning calorimetric, scanning electron microscopy, UV-Vis scanning spectrophotometer (UV-Vis) and fourier transform infrared spectroscopy (FT-IR), which demonstrated that there are intermolecular hydrogen bonds between PS and HP-β-CD in inclusion complex, resulting in the formation of amorphous form. To clarify the mechanism of the increase in the solubility and bioactivity of HP-β-CD-PS inclusion complexes, the structure of CD as well as the interaction of the HP-β-CD-PS inclusion formation was elucidated. The conclusions indicated that PS-HP-β-CD showed higher water solubility with greater solubilizing and complexing capabilities than PS-β-CD and PS itself. © 2012 Springer-Verlag Berlin Heidelberg.


Chen S.Y.,Zhejiang University of Technology | Tong H.,Zhejiang University of Technology | Cattani C.,University of Salerno
Mathematical Problems in Engineering | Year: 2012

Markov random field (MRF) is a widely used probabilistic model for expressing interaction of different events. One of the most successful applications is to solve image labeling problems in computer vision. This paper provides a survey of recent advances in this field. We give the background, basic concepts, and fundamental formulation of MRF. Two distinct kinds of discrete optimization methods, that is, belief propagation and graph cut, are discussed. We further focus on the solutions of two classical vision problems, that is, stereo and binary image segmentation using MRF model. © 2012 S. Y. Chen et al.


Wu Y.,Zhejiang University of Technology | Lau V.K.N.,Hong Kong University of Science and Technology | Tsang D.H.K.,Hong Kong University of Science and Technology | Qian L.P.,Zhejiang University of Technology
IEEE Transactions on Vehicular Technology | Year: 2012

In this paper, we study energy-efficient transmission for Cognitive Radio (CR) that opportunistically operates on the primary user's channel through spectrum sensing. Spectrum sensing and compulsory idling (for incumbent protection) introduce energy overheads for Secondary User (SU) operations, and thus, an appropriate balance between energy consumption in data transmission and energy overheads is required. We formulate this problem as a discrete-time Markov decision process in which the SU aims at minimizing its average cost (including both energy consumption and delay cost) to finish a target traffic payload through an appropriate rate allocation. Based on certainty equivalent control, we propose a low-complexity rate-adaptation policy that achieves comparable performance with the optimal policy. With the low-complexity policy, we quantify the impact of energy overheads (including the power consumption for spectrum sensing and compulsory idling) on the SU transmission strategy. Specifically, the SU rate increases with the increase of energy overheads, whose marginal impact, however, diminishes. Moreover, the marginal impact of energy overheads is more significant for delay-insensitive traffic compared with that for delay-sensitive traffic. To mitigate the loss due to imperfect spectrum sensing, we quantify that the SU decreases (increases) its rate with a larger misdetection probability (false alarm probability). © 1967-2012 IEEE.


Chen S.,Zhejiang University of Technology | Huang W.,Zhejiang University of Technology | Cattani C.,University of Salerno | Altieri G.,University of Salerno
Mathematical Problems in Engineering | Year: 2012

Traffic dynamics on complex networks are intriguing in recent years due to their practical implications in real communication networks. In this survey, we give a brief review of studies on traffic routing dynamics on complex networks. Strategies for improving transport efficiency, including designing efficient routing strategies and making appropriate adjustments to the underlying network structure, are introduced in this survey. Finally, a few open problems are discussed in this survey.


Chen S.,Zhejiang University of Technology | Zheng Y.,Zhejiang University of Technology | Cattani C.,University of Salerno | Wang W.,Zhejiang University of Technology
Computational and Mathematical Methods in Medicine | Year: 2012

This article summarizes some methods from biological intelligence for modeling and optimization of supply chain management (SCM) systems, including genetic algorithms, evolutionary programming, differential evolution, swarm intelligence, artificial immune, and other biological intelligence related methods. An SCM system is adaptive, dynamic, open self-organizing, which is maintained by flows of information, materials, goods, funds, and energy. Traditional methods for modeling and optimizing complex SCM systems require huge amounts of computing resources, and biological intelligence-based solutions can often provide valuable alternatives for efficiently solving problems. The paper summarizes the recent related methods for the design and optimization of SCM systems, which covers the most widely used genetic algorithms and other evolutionary algorithms. Copyright © 2012 Shengyong Chen et al.


Shao Y.-H.,Zhejiang University of Technology | Deng N.-Y.,China Agricultural University | Chen W.-J.,Zhejiang University of Technology
Knowledge-Based Systems | Year: 2013

Note that for GEPSVM proposed in [1], the predicted class of a testing point is determined by comparing two distances between the testing point and two hyperplanes, while the optimization problems are based on comparing two distances between a hyperplane and two kinds of the training points. So there exists some inconformity between the decision process and the training process. In this paper, we propose a new proximal classifier, called PCC for short, with consistency, which is always based on comparing two distances between a point (the testing point in the decision process and the training point in the training process) and two hyperplanes. This consistency not only makes our PCC to be more reasonable logically, but also naturally leads to a simpler decision function with less computation cost. Furthermore, in our PCC two general eigenvalue problems in GEPSVM are replaced by two simple eigenvalues problems with a parameter δ. In addition, different regularization terms are introduced in the formulation of our PCC, avoiding the singular problems possibly appeared in GEPSVM. Experimental results on several benchmark data sets show that our PCC is not only faster, but also has better generalization. © 2013 Elsevier B.V. All rights reserved.


Luo S.-P.,Leibniz Institute for Catalysis at the University of Rostock | Luo S.-P.,Zhejiang University of Technology | Esteban Mejia,Leibniz Institute for Catalysis at the University of Rostock | Friedrich A.,University of Rostock | And 10 more authors.
Angewandte Chemie - International Edition | Year: 2013

Of noble descent: A fully noble-metal-free system for the photocatalytic reduction of water at room temperature has been developed. This system consists of CuI complexes as photosensitizers and [Fe3(CO) 12] as the water-reduction catalyst. The novel Cu-based photosensitizers are relatively inexpensive, readily available from commercial sources, and stable to ambient conditions, thus making them an attractive alternative to the widely used noble-metal based systems. © 2013 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.


Shao Y.-H.,Zhejiang University of Technology | Deng N.-Y.,China Agricultural University | Chen W.-J.,Zhejiang University of Technology | Wang Z.,Jilin University
IEEE Signal Processing Letters | Year: 2013

In this letter, we propose an improved version of generalized eigenvalue proximal support vector machine (GEPSVM), called IGEPSVM for short. The main improvements are 1) the generalized eigenvalue decomposition is replaced by the standard eigenvalue decomposition, resulting in simpler optimization problems without the possible singularity. 2) An extra meaningful parameter is introduced, resulting in the stronger classification generalization ability. Experimental results on both the artificial datasets and several benchmark datasets show that our IGEPSVM is superior to GEPSVM in both computation time and classification accuracy. © 2013 IEEE.


Shao Y.-H.,Zhejiang University of Technology | Deng N.-Y.,China Agricultural University | Yang Z.-M.,Zhejiang University of Technology
Pattern Recognition | Year: 2012

In this paper we formulate a least squares version of the recently proposed projection twin support vector machine (PTSVM) for binary classification. This formulation leads to extremely simple and fast algorithm, called least squares projection twin support vector machine (LSPTSVM) for generating binary classifiers. Different from PTSVM, we add a regularization term, ensuring the optimization problems in our LSPTSVM are positive definite and resulting better generalization ability. Instead of usually solving two dual problems, we solve two modified primal problems by solving two systems of linear equations whereas PTSVM need to solve two quadratic programming problems along with two systems of linear equations. Our experiments on publicly available datasets indicate that our LSPTSVM has comparable classification accuracy to that of PTSVM but with remarkably less computational time. © 2011 Elsevier Ltd. All rights reserved.


Shao Y.-H.,Zhejiang University of Technology | Deng N.-Y.,China Agricultural University
Neural Computing and Applications | Year: 2013

For classification problems, twin support vector machine (TWSVM) determines two nonparallel hyperplanes by solving two related SVM-type problems. TWSVM classifies binary patterns by the proximity of it to one of the two nonparallel hyperplanes. Thus, to calculate the distance of a pattern from the hyperplane, we need the unity norm of the normal vector of the hyperplane. But in the formulation of TWSVM, these equality constraints were not considered. In this paper, we consider unity norm constraints by using Euclidean norm and add a regularization term with the idea of maximizing some margin in TWSVM and propose a novel margin-based twin support vector machines with unity norm hyperplanes (UNH-MTSVM). We solved UNH-MTSVM by Newton's method, and the solution is updated by conjugate gradient method. The performance of both the linear and nonlinear UNH-MTSVM is verified experimentally on several bench mark and synthetic datasets. Experimental results show the effectiveness of our methods in both computation time and classification accuracy. © 2012 Springer-Verlag London Limited.


Shao Y.-H.,Zhejiang University of Technology | Wang Z.,Jilin University | Chen W.-J.,Zhejiang University of Technology | Deng N.-Y.,China Agricultural University
Knowledge-Based Systems | Year: 2013

For the recently proposed projection twin support vector machine (PTSVM) [1], we propose a simpler and reasonable variant from theoretical point of view, called projection twin support vector machine with regularization term, RPTSVM for short. Note that only the empirical risk minimization is introduced in primal problems of PTSVM, incurring the possible singularity problems. Our RPTSVM reformulates the primal problems by adding a maximum margin regularization term, and, therefore, the singularity is avoided and the regularized risk principle is implemented. In addition, the nonlinear classification ignored in PTSVM is also considered in our RPTSVM. Further, a successive overrelaxation technique and a genetic algorithm are introduced to solve our optimization problems and to do the parameter selection, respectively. Computational comparisons of our RPTSVM against original PTSVM, TWSVM and MVSVM indicate that our RPTSVM obtains better generalization than others. © 2012 Elsevier B.V. All rights reserved.


Jin Y.,Zhejiang University of Technology | Jin Y.,Max Planck Institute for Mathematics in the Sciences | Jost J.,Max Planck Institute for Mathematics in the Sciences | Wang G.,Albert Ludwigs University of Freiburg
Journal of Mathematical Imaging and Vision | Year: 2012

In this paper, we present a nonlocal version of the OSV model by using the new results of Bartholdi-Schick-Smale-Smale. We compare this model with other nonlocal models, both theoretically and in computer experiments. © 2011 Springer Science+Business Media, LLC.


Meng X.,Zhejiang University of Technology | Pan Q.,China Agricultural University | Ding Y.,Zhejiang University of Technology | Jiang L.,Northeast Agricultural University
Food Chemistry | Year: 2014

A rapid mid-FTIR method was developed to quantitatively determine the total phospholipid (PL) content of vegetable oils. The method simply requires that the oil be diluted 4:1 (w/w) with hexane, its spectrum taken and ratioed against a hexane background. A calibration was devised using partial least squares by adding purified soybean PL at levels of 0.02-2.0% to phospholipid-free oils (soybean, rapeseed, sunflower) using the spectral region encompassing 1357-1000 cm-1 and validated using the AOCS 12-55. Using calibration and leave-one-out cross-validation predictive errors, a 200-20,000 ppm calibration was accurate to within ±362 and 488 ppm, respectively, while for sub-calibrations ranging from 200 to 2000; 2000 to 8000 and 8000 to 20,000 ppm, they were ±72-172, ±119-220, and ± 242-371 ppm, respectively. Although limited to 3 oil types in this study, the calibration is simple to devise and can be broadened to the universe of oil types of interest, the analytical protocol being straightforward and the analysis readily automatable. © 2013 Elsevier Inc. All rights reserved.


Shi L.,Beihang University | Wu F.,Zhejiang University of Technology
2013 IEEE International Conference on Information and Automation, ICIA 2013 | Year: 2013

Islanding detection is an indispensable function of grid-connected photovoltaic power generation system, and active phase shift method serves as an effective way to implement it. However, a too small disturbance quantity setting is likely to generate non-detection zone, and an adverse effect on output power quality when the disturbance is oversize. In order to solve the problem, an islanding detection algorithm based on fuzzy adaptive phase drift control is proposed, of which introduced self-adjust accelerating gain into frequency difference positive feedback. Basing on analysis of the relationship between the frequency drift of the point of common coupling voltage and the load characteristics after the initial disturbance, the algorithm parameters are discussed to adapt to frequency drift at different loads during the disconnection of power grid. The simulation and experimental results indicate that the algorithm has short detection time, no non-detection zone and less grid current THD. © 2013 IEEE.


Shao Y.-H.,Zhejiang University of Technology | Chen W.-J.,Zhejiang University of Technology | Deng N.-Y.,China Agricultural University
Information Sciences | Year: 2014

In this paper, we propose a nonparallel hyperplane support vector machine (NHSVM) for binary classification problems. Our proposed NHSVM is formulated by clustering the training points according to the similarity between classes. It constructs two nonparallel hyperplanes simultaneously by solving a single quadratic programming problem, and is consistent between its predicting and training processes - an essential difference that distinguishes it from other nonparallel SVMs. This proposed NHSVM has been analyzed theoretically and implemented experimentally. The results of experiments conducted using it on both artificial and publicly available benchmark datasets confirm its feasibility and efficacy, especially for "Cross Planes" datasets and datasets with heteroscedastic noise. © 2014 Published by Elsevier Inc.


Jin Y.,Zhejiang University of Technology | Jost J.,Max Planck Institute for Mathematics in the Sciences | Jost J.,University of Leipzig | Wang G.,Albert Ludwigs University of Freiburg
Journal of Mathematical Imaging and Vision | Year: 2014

Following ideas of Kindermann et al. (Multiscale Model. Simul. 4(4):1091-1115, 2005) and Gilboa and Osher (Multiscale Model. Simul. 7:1005-1028, 2008) we introduce new nonlocal operators to interpret the nonlocal means filter (NLM) as a regularization of the corresponding Dirichlet functional. Then we use these nonlocal operators to propose a new nonlocal H1 model, which is (slightly) different from the nonlocal H 1 model of Gilboa and Osher (Multiscale Model. Simul. 6(2):595-630, 2007; Proc. SPIE 6498:64980U, 2007). The key point is that both the fidelity and the smoothing term are derived from the same geometric principle. We compare this model with the nonlocal H1 model of Gilboa and Osher and the nonlocal means filter, both theoretically and in computer experiments. The experiments show that this new nonlocal H1 model also provides good results in image denoising and closer to the nonlocal means filter than the H1 model of Gilboa and Osher. This means that the new nonlocal operators yield a better interpretation of the nonlocal means filter than the nonlocal operators given in Gilboa and Osher (Multiscale Model. Simul. 7:1005-1028, 2008). © 2012 Springer Science+Business Media New York.


Shao Y.-H.,Zhejiang University of Technology | Wang Z.,Jilin University | Chen W.-J.,Zhejiang University of Technology | Deng N.-Y.,China Agricultural University
Applied Intelligence | Year: 2013

In this paper, we propose a novel least squares twin parametric-margin support vector machine (TPMSVM) for binary classification, called LSTPMSVM for short. LSTPMSVM attempts to solve two modified primal problems of TPMSVM, instead of two dual problems usually solved. The solution of the two modified primal problems reduces to solving just two systems of linear equations as opposed to solving two quadratic programming problems along with two systems of linear equations in TPMSVM, which leads to extremely simple and fast algorithm. Classification using nonlinear kernel with reduced technique also leads to systems of linear equations. Therefore our LSTPMSVM is able to solve large datasets accurately without any external optimizers. Further, a particle swarm optimization (PSO) algorithm is introduced to do the parameter selection. Our experiments on synthetic as well as on several benchmark data sets indicate that our LSTPMSVM has comparable classification accuracy to that of TPMSVM but with remarkably less computational time. © 2013 Springer Science+Business Media New York.


Li M.,East China Normal University | Cattani C.,University of Salerno | Chen S.-Y.,Zhejiang University of Technology
Mathematical Problems in Engineering | Year: 2011

Sea level fluctuation gains increasing interests in several fields, such as geoscience and ocean dynamics. Recently, the long-range dependence (LRD) or long memory, which is measured by the Hurst parameter, denoted by H, of sea level was reported by Barbosa et al. (2006). However, reports regarding the local roughness of sea level, which is characterized by fractal dimension, denoted by D, of sea level, are rarely seen. Note that a common model describing a random function with LRD is fractional Gaussian noise (fGn), which is the increment process of fractional Brownian motion (fBm) (Beran (1994)). If using the model of fGn, D of a random function is greater than 1 and less than 2 because D is restricted by H with the restriction D=2-H. In this paper, we introduce the concept of one-dimensional random functions with LRD based on a specific class of processes called the Cauchy-class (CC) process, towards separately characterizing the local roughness and the long-range persistence of sea level. In order to achieve this goal, we present the power spectrum density (PSD) function of the CC process in the closed form. The case study for modeling real data of sea level collected by the National Data Buoy Center (NDBC) at six stations in the Florida and Eastern Gulf of Mexico demonstrates that the sea level may be one-dimensional but LRD. The case study also implies that the CC process might be a possible model of sea level. In addition to these, this paper also exhibits the yearly multiscale phenomenon of sea level. Copyright © 2011 Ming Li et al.


Bai S.,Zhejiang University of Technology | Wang R.,Zhejiang University of Technology | Li M.,Beihang University
Ceramics International | Year: 2015

Wettability control of laser textured SiC ceramic surfaces through the addition of pure elements was studied in this work. A correlation analysis between the elements C/O/Si/B/Al/Fe and the contact angle demonstrates that elements C/O/Si/B are all highly correlated with the wettability. The correlation of elements Fe/Al with the contact angle is relatively lower. Because elements C/Si are inherent elements in a SiC material, element O is derived from oxidation, and element B is added along with the additives during the sintering process. A more hydrophilic SiC surface was obtained by controlling the addition of element B. © 2015 Elsevier Ltd and Techna Group S.r.l.


Zheng Y.-J.,Zhejiang University of Technology | Song Q.,China Agricultural University | Chen S.-Y.,Zhejiang University of Technology
Applied Soft Computing Journal | Year: 2013

Variable-rate fertilization (VRF) decision is a key aspect of prescription generation in precision agriculture, which typically involves multiple criteria and objectives. This paper presents a multiobjective optimization problem model for oil crop fertilization, which takes into consideration not only crop yield and quality but also energy consumption and environmental effects. For efficiently solving the problem, we propose a hybrid multiobjective fireworks optimization algorithm (MOFOA) that evolves a set of solutions to the Pareto optimal front by mimicking the explosion of fireworks. In particular, it uses the concept of Pareto dominance for individual evaluation and selection, and combines differential evolution (DE) operators to increase information sharing among the individuals. The experimental tests and realworld applications in oil crop production in east China demonstrate the effectiveness and practicality of the algorithm. © 2012 Elsevier B.V. All rights reserved.


Shao Y.-H.,Zhejiang University of Technology | Deng N.-Y.,China Agricultural University | Yang Z.-M.,Zhejiang University of Technology | Chen W.-J.,Zhejiang University of Technology | Wang Z.,Jilin University
Knowledge-Based Systems | Year: 2012

In many cases, the output of a classifier should be a calibrated posterior probability to enable post-processing. However, twin support vector machines (TWSVM) do not provide such probabilities. In this paper, we propose a TWSVM probability model, called PTWSVM, to estimate the posterior probability. Note that our model is quite different from the SVM probability model because of the different mechanism of TWSVM and SVM. In fact, for TWSVM, we first define a new ranking continues output by comparing the distances between the sample and the two non-parallel hyperplanes, and then map this ranking continues output into probability by training the parameters of an additional sigmoid function. Our PTWSVM has been tested on both artificial datasets and several data-mining-style datasets, and the numerical experiments indicate that PTWSVM yields nice results. © 2012 Elsevier B.V. All rights reserved.


Li J.,Zhejiang University of Technology | Ma L.,Zhejiang University of Technology | Wei S.,Zhejiang University of Technology | Horn H.,Karlsruhe Institute of Technology
Separation and Purification Technology | Year: 2013

Aerobic granules respectively dwelling abundant vorticella and rotifers in a sequencing batch reactor (SBR) fed with real domestic wastewater were cultured. Most vorticella anchored into the granules by stalks, while rotifers attached or adhered to the surface of granules. Vorticella and rotifers going through a process of growth, blooming and decline successively was mainly caused by sludge granulation and available food from detached fine biomass particles. The mean SVI of two type granules were 43.9 mL/g and 33.9 mL/g, respectively. Flower-like vorticella on the surface of granules led to the lower settling velocity and higher SVI compared to naked granules or granules with rotifers. A positive effect on the reduction of suspended solids (SSs) in the effluent can be linked to the ingested fine biomass particles by vorticella and rotifers. The direct immunofluorescence assay demonstrated the phenomenon of the FITC-labeled bacteria was ingested into the guts of rotifers. © 2013 Elsevier Ltd. All rights reserved.


Wei Z.,Zhejiang University | Yang Y.,Zhejiang University | Hou Y.,Zhejiang University | Liu Y.,Zhejiang University of Technology | And 2 more authors.
ChemCatChem | Year: 2014

Solid acid catalysts of graphene oxide and sulfonated graphene oxide nanosheets have been prepared by using the modified Hummers and sulfonation methods. Physical characterization indicated that a number of functional groups such as -COOH, -OH, -O-, and -SO3H were introduced onto the surfaces of the as-synthesized nanosheets. The catalytic performance of the synthesized catalysts was evaluated in the hydrolysis of the glycosidic bond and Fischer esterification. The experimental results indicated that the catalytic activity of the sulfonated graphene oxide was superior to that of other solid acid catalysts with the same or higher acid strength and has also exceeded that of H2SO4 with 9.1 times of acid strength than that of the sulfonated graphene oxide. The high reactivity can be ascribed to the formation of hydrophobic cavities through the combination of graphene sheet and the oxygen-containing groups on its surface, which may facilitate the catalyst to anchor with reactants and promote the attack of protons. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Li Y.,Tianjin University | Yu Y.,Tianjin University | Wang J.-G.,Zhejiang University of Technology | Song J.,University of Aarhus | And 3 more authors.
Applied Catalysis B: Environmental | Year: 2012

Graphene supported palladium (Pd) catalyst has been prepared using the conventional impregnation and hydrogen reduction method. Highly dispersed nano particles are formed on the support graphene. The density functional theory (DFT) study and the catalyst characterization using Raman and X-ray photoelectron spectroscopy confirm that the oxygen containing groups play an important role in stabilizing Pd clusters on graphene. The first layer of the metal particle mainly presents as PdO x. The graphene supported Pd catalyst shows superior catalytic activity and high stability for CO oxidation. The kinetic studies indicate that CO oxidation over the graphene supported Pd catalyst follows the Langmuir-Hinshelwood (L-H) mechanism. © 2012 Elsevier B.V.


Shao Y.-H.,Zhejiang University of Technology | Chen W.-J.,Zhejiang University of Technology | Zhang J.-J.,China Agricultural University | Wang Z.,Jilin University | Deng N.-Y.,China Agricultural University
Pattern Recognition | Year: 2014

In this paper, we propose an efficient weighted Lagrangian twin support vector machine (WLTSVM) for the imbalanced data classification based on using different training points for constructing the two proximal hyperplanes. The main contributions of our WLTSVM are: (1) a graph based under-sampling strategy is introduced to keep the proximity information, which is robustness to outliers, (2) the weight biases are embedded in the Lagrangian TWSVM formulations, which overcomes the bias phenomenon in the original TWSVM for the imbalanced data classification, (3) the convergence of the training procedure of Lagrangian functions is proven and (4) it is tested and compared with some other TWSVMs on synthetic and real datasets to show its feasibility and efficiency for the imbalanced data classification. © 2014 Elsevier Ltd.


Chen S.Y.,Zhejiang University of Technology | Luo G.J.,Karlsruhe Institute of Technology | Li X.,Yanshan University | Ji S.M.,Zhejiang University of Technology | Zhang B.W.,Nanjing University of Finance and Economics
IEEE Transactions on Industrial Electronics | Year: 2012

For pearls and other smooth alike lustrous jewels, the apparent shininess is one of the most important factors of beauty. This paper proposes an approach to automatic assessment of spherical surface quality in measure of shininess and smoothness using artificial vision. It traces a light ray emitted by a point source and images the resulting highlight patterns reflected from the surface. Once the reflected ray is observed as a white-clipping level in the camera image, the direction of the incident ray is determined and the specularity is estimated. As the specular exponent is the most important reason of surface shininess, the method proposed can efficiently determine the equivalent index of appearance for quality assessment. The observed highlight spot and specular exponent measurement described in this paper provide a way to measure the shininess and to relate the surface appearance with white-clipped image highlights. This is very useful to industrial applications for automatic classification of spherical objects. Both numerical simulations and practical experiments are carried out. Results of objective and subjective comparison show its satisfactory consistency with expert visual inspection. It also demonstrates the feasibility in practical industrial systems. © 2012 IEEE.


Na J.,Kunming University of Science and Technology | Chen Q.,Zhejiang University of Technology | Ren X.,Beijing Institute of Technology | Guo Y.,Kunming University of Science and Technology
IEEE Transactions on Industrial Electronics | Year: 2014

This paper proposes an adaptive control for a class of nonlinear mechanisms with guaranteed transient and steady-state performance. A performance function characterizing the convergence rate, maximum overshoot, and steady-state error is used for the output error transformation, such that stabilizing the transformed system is sufficient to achieve the tracking control of the original system with a priori prescribed performance. A continuously differentiable friction model is adopted to account for the friction nonlinearities, for which primary model parameters are online updated. A novel high-order neural network with only a scalar weight is developed to approximate unknown nonlinearities and to dramatically diminish the computational costs. Comparative experiments on a turntable servo system are included to verify the reliability and effectiveness. © 1982-2012 IEEE.


Chi K.,Zhejiang University of Technology | Jiang X.,Tohoku University | Horiguchi S.,Tohoku University
IEEE Transactions on Vehicular Technology | Year: 2010

Network coding has the potential to greatly improve the throughput of wireless networks. In the current proposals for wireless network coding, network nodes transmit packets at a fixed transmission rate. It is notable, however, that by dynamically selecting the rate, we can effectively improve the node transmission efficiency. In this paper, we study the application of a rate-adaptive transmission mechanism in network-coding-based multihop wireless networks. In such networks, whether a coding solution is satisfactory or not depends not only on the number of involved native packets but on the packet loss probabilities of its intended next hops and its transmission time as well, both of which depend on the transmission rate. Therefore, we aim to jointly design the coding operation and rate selection to maximize the transmission efficiency. Specifically, we first describe and mathematically formulate the optimal packet coding and rate-selection problem. Then, we prove the NP-completeness of this optimization problem. Finally, we propose an efficient algorithm for finding good combinations of the coding solution and the transmission rate. Simulation results demonstrate that compared with the rate-fixed transmission, the rate-adaptive transmission based on our algorithm can significantly improve the node transmission efficiency. © 2010 IEEE.


Lin K.,Zhejiang University of Technology | Lin K.,University of Sao Paulo | Shu F.-W.,Nanchang University | Wang A.,Zhejiang University of Technology | And 2 more authors.
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2015

In this paper, we present all [(d+1)+1]-dimensional static diagonal vacuum solutions of the nonprojectable Hořava-Lifshitz gravity in the IR limit and show that they give rise to very rich Lifshitz-type structures, depending on the choice of the free parameters of the solutions. These include the Lifshitz space-times with or without hyperscaling violation, Lifshitz solitons, and black holes. Remarkably, even the theory breaks explicitly the Lorentz symmetry and allows generically instantaneous propagations, universal horizons still exist, which serve as one-way membranes for signals moving with any large velocities. In particular, particles even with infinitely large velocities would just move around on these boundaries and would not be able to escape to infinity. Another remarkable feature appearing in the Lifshitz-type space-times is that the dynamical exponent z can take its values only in the ranges 1≤z<2 for d≥3 and 1≤z<∞ for d=2, due to the stability and ghost-free conditions of the theory. © 2015 American Physical Society.


Song H.,Zhejiang University of Finance and Economics | Liu G.-P.,University of South Wales | Liu G.-P.,Harbin Institute of Technology | Yu L.,Zhejiang University of Technology
IEEE Transactions on Industrial Electronics | Year: 2013

This paper studies the design and stability analysis of uncertain networked control systems with multiple feedback channels. An observer-based networked predictive control (NPC) method is proposed to compensate for the distributed delays and packet dropouts in the feedback channels. Sufficient conditions are presented for the closed-loop NPC system with distributed delays and packet dropouts to be stable, both in constant and random cases. A ball-and-beam system is employed to test the proposed method. Both the simulation and experiment results demonstrate the effectiveness of the method. © 1982-2012 IEEE.


Shen J.-N.,Zhejiang University of Technology | Ruan H.-M.,Zhejiang University of Technology | Wu L.-G.,Zhejiang GongShang University | Gao C.-J.,National Engineering Research Center for Liquid Separation Membrane
Chemical Engineering Journal | Year: 2011

Ultrafiltration (UF) has become an accepted process for drinking water treatment, but membrane fouling remains a significant problem. Polyethersulfone (PES)/SiO2 composite membranes were prepared by phase inversion method with nano-SiO2 as additive. Water contact angle measurement was conducted to investigate the hydrophilicity and surface wettability of the membranes. The effect of SiO2 nanoparticles on the membrane permeation properties, anti-fouling performances, and membrane morphologies and structures was examined and discussed. The influence of SiO2 on the water permeability, anti-fouling of the PES membranes were evaluated by raw water UF experiments. The results showed that the membrane structure was not obviously affected by addition of SiO2, and the membrane performances such as hydrophilicity and anti-fouling ability were enhanced by adding SiO2 nanoparticles. © 2011 Elsevier B.V.


Lin K.,Zhejiang University of Technology | Lin K.,University of Sao Paulo | Wang A.,Zhejiang University of Technology | Wang A.,Baylor University
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2013

In this paper, we study static post-Newtonian limits in nonprojectable Hořava-Lifshitz gravity with an extra U(1) symmetry. After obtaining all static spherical solutions in the infrared, we apply them to the Solar System tests, and obtain the Eddington-Robertson-Schiff parameters in terms of the coupling constants of the theory. These parameters are well consistent with observations for the physically viable coupling constants. In contrast to the projectable case, this consistence is achieved without taking the gauge field and Newtonian prepotential as part of the metric. © 2013 American Physical Society.


Tao X.,Zhejiang University of Technology | Tao X.,Stanford University | Wang J.,Zhejiang University of Technology | Ying Z.,Zhejiang University of Technology | And 9 more authors.
Nano Letters | Year: 2014

Lithium-sulfur batteries show fascinating potential for advanced energy storage systems due to their high specific capacity, low-cost, and environmental benignity. However, the shuttle effect and the uncontrollable deposition of lithium sulfide species result in poor cycling performance and low Coulombic efficiency. Despite the recent success in trapping soluble polysulfides via porous matrix and chemical binding, the important mechanism of such controllable deposition of sulfur species has not been well understood. Herein, we discovered that conductive Magnéli phase Ti4O7 is highly effective matrix to bind with sulfur species. Compared with the TiO2-S, the Ti4O7-S cathodes exhibit higher reversible capacity and improved cycling performance. It delivers high specific capacities at various C-rates (1342, 1044, and 623 mAh g-1 at 0.02, 0.1, and 0.5 C, respectively) and remarkable capacity retention of 99% (100 cycles at 0.1 C). The superior properties of Ti4O7-S are attributed to the strong adsorption of sulfur species on the low-coordinated Ti sites of Ti4O7 as revealed by density functional theory calculations and confirmed through experimental characterizations. Our study demonstrates the importance of surface coordination environment for strongly influencing the S-species binding. These findings can be also applicable to numerous other metal oxide materials. © 2014 American Chemical Society.


Ren C.-X.,Sun Yat Sen University | Dai D.-Q.,Sun Yat Sen University | Li X.-X.,Sun Yat Sen University | Li X.-X.,Zhejiang University of Technology | Lai Z.-R.,Sun Yat Sen University
IEEE Transactions on Image Processing | Year: 2014

Face recognition with illumination or pose variation is a challenging problem in image processing and pattern recognition. A novel algorithm using band-reweighed Gabor kernel embedding to deal with the problem is proposed in this paper. For a given image, it is first transformed by a group of Gabor filters, which output Gabor features using different orientation and scale parameters. Fisher scoring function is used to measure the importance of features in each band, and then, the features with the largest scores are preserved for saving memory requirements. The reduced bands are combined by a vector, which is determined by a weighted kernel discriminant criterion and solved by a constrained quadratic programming method, and then, the weighted sum of these nonlinear bands is defined as the similarity between two images. Compared with existing concatenation-based Gabor feature representation and the uniformly weighted similarity calculation approaches, our method provides a new way to use Gabor features for face recognition and presents a reasonable interpretation for highlighting discriminant orientations and scales. The minimum Mahalanobis distance considering the spatial correlations within the data is exploited for feature matching, and the graphical lasso is used therein for directly estimating the sparse inverse covariance matrix. Experiments using benchmark databases show that our new algorithm improves the recognition results and obtains competitive performance. © 2013 IEEE.


Lin X.,Zhejiang University of Technology | Ni J.,Tsinghua University
Journal of Applied Physics | Year: 2015

First-principles calculations have been performed to investigate the low energy electronic properties and van Hove singularities (VHSs) of silicene under uniaxial strain. The Dirac points (DPs) persist when silicene is stretched uniaxially, while they are shifted away from the corners (K points) of the first Brillouin zone (FBZ). The relative positions of DPs with respect to the K points for silicene strained along the armchair (AC) or zigzag (ZZ) direction show opposite tendency compared with strained graphene, which is due to the larger deformation of the unit cell of strained silicene than that of strained graphene. Moreover, for silicene under AC or ZZ strain, the Fermi velocities around DPs along the positive and negative directions of the FBZ show rather significant difference. The nature of the VHS just above the Fermi energy undergoes a transition from the π∗ band to the σ∗ band for silicene under increasing AC or ZZ strain. These observations suggest uniaxial strain as an effective route to tune the electronic properties of silicene for potential applications in future electronic devices. © 2015 AIP Publishing LLC.


Bai L.,Tsinghua University | Bai S.,Zhejiang University of Technology
Tribology Transactions | Year: 2014

Geometric and distribution effects of inclined dimples on the friction and wear performance of a textured surface were experimentally investigated. The frictional coefficients and face temperatures of four different kinds of elliptical surfaces were measured under various conditions of rotation speed, load, and viscosity. Experimental results showed that distribution parameters significantly affected frictional performance. From the experiments it was found that surfaces with double-row elliptical dimples have smaller frictional coefficients and lower face temperatures than that of the single-row elliptical dimples and had a 59% decrease in frictional coefficient and a 58% decrease in face temperature rise. This means that double-row elliptical dimples can lead to a more profound hydrodynamic effect as well as possess a lower chance of surface contact and wear. Moreover, a larger dimple diameter and slender ratio further improved the frictional performance of the textured surface with double-row elliptical dimples. © 2014, Copyright © Society of Tribologists and Lubrication Engineers.


He D.-F.,Zhejiang University of Technology | Ding B.-C.,Xi'an Jiaotong University | Yu S.-Y.,Jilin University
Kongzhi Lilun Yu Yingyong/Control Theory and Applications | Year: 2013

With the successful applications of model predictive control for linear systems, predictive control for nonlinear models (NMPC) has received wide attention and achieved rich results in the last two decades. Based on the fundamental principle and characteristics of NMPC, the state of the art of NMPC is reviewed from the topics of feasibility, stability, robustness, optimization solution to regions of attraction, respectively. Open problems concerning NMPC are also discussed.


Wang T.,Zhejiang GongShang University | Shen J.-N.,Zhejiang University of Technology | Wu L.-G.,Zhejiang GongShang University | Bruggen B.V.D.,Catholic University of Leuven
Journal of Membrane Science | Year: 2014

The morphology and swelling performance of poly(methyl methacrylate) (PMMA) and polyurethane (PU) membranes containing pristine multi-walled carbon nanotubes (P-MWCNTs) was investigated. Next, amino (NH2) groups were introduced into the MWCNTs by chemical modification for improving their affinity to the membranes, thereby resulting in a better distribution of the MWCNTs in the membranes. The performance of the hybrid membranes was evaluated by swelling and pervaporation experiments. The Fourier transform infrared and transmission electron microscopy analyses showed that the addition of both the pristine and functionalized MWCNTs to the membranes improved their permeation performance. The dispersion of the P-MWCNTs and MWCNTs-NH2 in the PU hybrid membranes was better than that in the corresponding PMMA hybrid membranes because of the rapid polymerization rate of the monomers and the elasticity of the membranes. Thus, the P-MWCNTs/PU and MWCNTs-NH2/PU hybrid membranes performed better than the corresponding P-MWCNTs/PMMA and MWCNTS-NH2/PMMA hybrid membranes. The surface functionalization promoted the affinity of the MWCNTs to the monomer solution and the polymer membranes. Compared to the P-MWCNTs, the MWCNTs-NH2 showed an improved distribution in the PU and PMMA hybrid membranes, and the membranes containing the MWCNTs-NH2 performed better than those containing the P-MWCNTs. © 2014 Elsevier B.V.


Chen P.-Q.,Dongguan Institute of Environmental science | Tan C.-X.,Zhejiang University of Technology | Weng J.-Q.,Zhejiang University of Technology | Liu X.-H.,Zhejiang University of Technology
Asian Journal of Chemistry | Year: 2012

The commercial herbicide chlorimuron-ethyl (C 15H 15ClN 4O 6S, Mr = 414.82) was synthesized and its structure was studied by X-ray diffraction. The crystals are triclinic, space group P-1 with a = 7.831(3), b = 12.324(5), c = 20.242(8) Å, α = 94.941(7), β = 97.426(7), γ = 93.658(7)°. Theoretical calculation of chlorimuron-ethyl was carried out with B3LYP/6-31G (d,p). The full geometry optimization was carried out using 6-31G(d,p) basis set and the frontier orbital energy. This result is in accord with the result analyzed by the Frontier molecular orbital theory.


This experiment was designed to investigate the effect of feed supplementation with nano elemental Se (Nano-Se) on growth performance, tissue Se distribution, meat quality, and glutathione peroxidase (GSH-Px) activity in Guangxi Yellow chicken. Four treatments (control, T-1, T-2, and T-3 treatment groups) with 3 replicates of 30 chickens each were carried out. Diets for the control, T-1, T-2, and T-3 groups consisted of the basal diet supplemented with, respectively, 0.00, 0.10, 0.30, and 0.50 mg/kg of Nano- Se. Improved final BW, daily BW gain (DWG), feed conversion ratios, and survival rate (P < 0.05) were observed in the groups supplemented with Nano-Se as compared with the control groups after 90 d of feeding. The groups that received Nano-Se showed higher (P < 0.05) hepatic and muscle Se contents, drip loss percentage, inosine 5′-monophosphate content, and GSHPx activities in the serum and liver than that did the control groups. For the T-2 and T-3 groups, a significant difference (P < 0.05) was observed in final BW, DWG, muscle Se content, breast drip loss, and GSHPx activities in the serum and liver compared with the T-1 group. However, no significant differences were observed in final BW, DWG, and GSH-Px activities in the serum and liver between the T-2 and T-3 groups. It could be concluded from this study that supplementing diets with 0.30 mg/kg of Nano-Se for was effective in increasing the growth performance and feed conversion ratios of chickens, the Se content of tissues, and the quality of the meat. © 2011 Poultry Science Association Inc.


Zhonghui Z.,Zhejiang Police College | Xiaowei Z.,Zhejiang University of Technology | Fang F.,Zhejiang GongShang University
Saudi Journal of Biological Sciences | Year: 2014

The present study was designed to determine the effects of Ganoderma lucidum polysaccharides (GL-PS) on exhaustive exercise-induced oxidative stress in skeletal muscle tissues of mice. The mice were divided into four groups (three GL-PS administered groups and the control group). The control group was administered with distilled water and GL-PS administered groups were administered with GL-PS (50, 100 and 200. mg/kg body weight per day). After 28. days, the mice performed an exhaustive swimming exercise, along with the determination of superoxide dismutase (SOD), glutathione peroxidase (GPX), catalase (CAT) activities and malondialdehyde (MDA) levels in the skeletal muscle of mice. The results showed that GL-PS could increase antioxidant enzymes activities and decrease the MDA levels in the skeletal muscle of mice. This study provides strong evidence that GL-PS supplementation possessed protective effects against exhaustive exercise-induced oxidative stress. © 2013.


Gao Y.,CAS Beijing National Laboratory for Molecular | Gao Y.,CAS Dalian Institute of Chemical Physics | Hu G.,CAS Beijing National Laboratory for Molecular | Zhong J.,Soochow University of China | And 6 more authors.
Angewandte Chemie - International Edition | Year: 2013

Thanks to nitrogen introduced into the layered carbon framework of graphite, the chemical reactivity of the carbon atoms was increased. N-doped graphitic catalysts generate reactive oxygen species and display excellent activity for hydrocarbon activation even at room temperature. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Pei Z.,Zhejiang University of Technology | Zheng L.,Tsinghua University
Expert Systems with Applications | Year: 2012

In this paper we present a new approach to solve multi-attribute decision making problems in intuitionistic fuzzy environment. This approach is based on a new ranking method of intuitionistic fuzzy sets, in which the evaluated values (in the form of intervals) of the same alternative with different attributes are considered as one unified entity. According to people's intuition, the ranking method proposed in this paper is mainly grounded on a revised score function and a revised accuracy function of intuitionistic fuzzy sets. Different from the traditional methods, in this new approach, the degree of membership, the degree of nonmembership and the degree of hesitation are considered with various importance in reflecting the true image of the respective alternative. Furthermore, an optimization model is established to estimate the relative degree of importance of each quantity. Finally, two practical examples are provided to illustrate our approach. © 2011 Elsevier Ltd. All rights reserved.


Zhou X.,Zhejiang University of Technology | Ding Y.,Zhejiang University of Technology | Wang Y.,Zhejiang GongShang University
Reviews in Aquaculture | Year: 2012

The aim of proteomics is to simultaneously resolve all potential proteins expressed by a cell, tissue or organism in a specific physiological condition. It will allow scientists to build and test better hypotheses, with the ultimate goal to find better solutions to challenges in agricultural sciences, medicine and environmental management. Recent and very promising applications of proteomics have also been provided in the field of aquaculture, such as the search for antigenic proteins, the detection of differentially regulated proteins and the characterization of biologically active proteins primarily to investigate the physiology, development biology and impact of contaminants in aquatic organisms. Thus, a brief overview of present classical proteomics methodology (electrophoresis and mass spectrometry) is presented, and the proteome technique will be focused in the context of applications beneficial to the field of fish, shellfish and seafood/seafood product. In addition, the future potential application and challenge of proteomics in aquaculture will also be discussed. © 2012 Blackwell Publishing Asia Pty Ltd.


Liu M.,Zhejiang University of Technology | Liu M.,Hohai University | Gao Y.,Hohai University | Liu H.,Hohai University
International Journal for Numerical and Analytical Methods in Geomechanics | Year: 2014

A new elastoplastic model is developed for rockfills within the general critical state framework incorporating the state parameter. Two state functions are proposed to characterize the evolution of volume dilation and strain softening of rockfills, and a modified breakage index based on the concept of Hardin's relative breakage is defined to describe the progressive crushing of rockfills. The nonassociated plastic flow rule is derived from a state dependent dilatancy equation, and it incorporates energy dissipation due to intrinsic nonlinear friction and particle breakage upon shearing. Thus, their couple effect on the plastic deviatoric and volumetric deformation of rockfills is taken into account in the current model. The numerical analyses are carried out for a series of drained triaxial tests on the modeled rockfills at various consolidation pressures and stress paths. The volume dilation/contraction and strain softening/hardening of rockfills are accurately predicted by the proposed model, and the particle breakage and nonlinear critical state shear strength of rockfills are also well captured. The research findings indicate that the current model is applicable to represent the complex stress-strain-volume change behavior of rockfills in general. © 2013 John Wiley & Sons, Ltd.


Tan D.,Tsinghua University | Tan D.,Zhejiang University of Technology | Wu Q.,Tsinghua University | Chen J.-C.,Tsinghua University | Chen G.-Q.,Tsinghua University
Metabolic Engineering | Year: 2014

The halophile Halomonas TD01 and its derivatives have been successfully developed as a low-cost platform for the unsterile and continuous production of chemicals. Therefore, to increase the genetic engineering stability of this platform, the DNA restriction/methylation system of Halomonas TD01 was partially inhibited. In addition, a stable and conjugative plasmid pSEVA341 with a high-copy number was constructed to contain a LacIq-Ptrc system for the inducible expression of multiple pathway genes. The Halomonas TD01 platform, was further engineered with its 2-methylcitrate synthase and three PHA depolymerases deleted within the chromosome, resulting in the production of the Halomonas TD08 strain. The overexpression of the threonine synthesis pathway and threonine dehydrogenase made the recombinant Halomonas TD08 able to produce poly(3-hydroxybutyrate-co-3-hydroxyvalerate) or PHBV consisting of 4-6mol% 3-hydroxyvalerate or 3HV, from various carbohydrates as the sole carbon source. The overexpression of the cell division inhibitor MinCD during the cell growth stationary phase in Halomonas TD08 elongated its shape to become at least 1.4-fold longer than its original size, resulting in enhanced PHB accumulation from 69wt% to 82wt% in the elongated cells, further promoting gravity-induced cell precipitations that simplify the downstream processing of the biomass. The resulted Halomonas strains contributed to further reducing the PHA production cost. © 2014 International Metabolic Engineering Society.


Zhang Y.,CAS Shanghai Institutes for Biological Sciences | Xu Y.-H.,Zhejiang University of Technology | Yi H.-Y.,CAS Shanghai Institutes for Biological Sciences | Gong J.-M.,CAS Shanghai Institutes for Biological Sciences
Plant Journal | Year: 2012

The plant vacuole is an important organelle for storing excess iron (Fe), though its contribution to increasing the Fe content in staple foods remains largely unexplored. In this study we report the isolation and functional characterization of two rice genes OsVIT1 and OsVIT2, orthologs of the Arabidopsis VIT1. Transient expression of OsVIT1:EGFP and OsVIT2:EGFP protein fusions revealed that OsVIT1 and OsVIT2 are localized to the vacuolar membrane. Ectopic expression of OsVIT1 and OsVIT2 partially rescued the Fe2+- and Zn2+-sensitive phenotypes in yeast mutant Δccc1 and Δzrc1, and further increased vacuolar Fe2+, Zn2+ and Mn2+ accumulation. These data together suggest that OsVIT1 and OsVIT2 function to transport Fe2+, Zn2+ and Mn 2+ across the tonoplast into vacuoles in yeast. In rice, OsVIT1 and OsVIT2 are highly expressed in flag leaf blade and sheath, respectively, and in contrast to OsVIT1, OsVIT2 is highly responsive to Fe treatments. Interestingly, functional disruption of OsVIT1 and OsVIT2 leads to increased Fe/Zn accumulation in rice seeds and a corresponding decrease in the source organ flag leaves, indicating an enhanced Fe/Zn translocation between source and sink organs, which might represent a novel strategy to biofortify Fe/Zn in staple foods. © 2012 Blackwell Publishing Ltd.


Chi K.,Zhejiang University of Technology | Jiang X.,Tohoku University | Horiguchi S.,Tohoku University
Computer Networks | Year: 2010

Reliable multicast, the lossless dissemination of data from one sender to a group of receivers, has a wide range of important applications. Recently, network coding has been applied to the reliable multicast in wireless networks, where multiple lost packets with distinct intended receivers are XOR-ed together as one packet and forwarded via single retransmission, resulting in a significant reduction of bandwidth consumption. However, the simple XOR operation cannot fully exploit the potential coding opportunities and finding the optimal set of lost packets for XOR-ing is a complex NP-complete optimization problem. In this work, we intend to move beyond the simple XOR to more general coding operations. Specifically, we propose two new schemes (a static scheme which repeatedly retransmits one coding packet until all intended receivers receive it and a dynamic scheme which updates the coding packet once one or more receivers receive it) to encode packets with more general coding operations, which not only can encode lost packets with common intended receivers together to fully exploit the potential coding opportunities but also have polynomial-time complexity. We demonstrate, through both analytical and simulation results, that the proposed schemes can more greatly reduce the bandwidth requirement than the available coding-based schemes, especially in the case of high packet loss probabilities and a larger number of receivers. This reduction can vary from a few percents to over 15% depending on the packet loss probabilities and the number of receivers. © 2010 Elsevier B.V. All rights reserved.


Wang Z.,Jilin University | Shao Y.-H.,Zhejiang University of Technology | Wu T.-R.,Jilin University
Pattern Recognition | Year: 2013

The recently proposed twin parametric-margin support vector machine, denoted by TPMSVM, gains good generalization and is suitable for many noise cases. However, in the TPMSVM, it solves two dual quadratic programming problems (QPPs). Moreover, compared with support vector machine (SVM), TPMSVM has at least four regularization parameters that need regulating, which affects its practical applications. In this paper, we increase the efficiency of TPMSVM from two aspects. First, by introducing a quadratic function, we directly optimize a pair of QPPs of TPMSVM in the primal space, called STPMSVM for short. Compared with solving two dual QPPs in the TPMSVM, STPMSVM can obviously improve the training speed without loss of generalization. Second, a genetic algorithm GA-based model selection for STPMSVM in the primal space is suggested. The GA-based STPMSVM can not only select the parameters efficiently, but also provide discriminative feature selection. Computational results on several synthetic as well as benchmark datasets confirm the great improvements on the training process of our GA-based STPMSVM. © 2013 Elsevier Ltd.


Lin K.,Zhejiang University of Technology | Lin K.,University of Sao Paulo | Mukohyama S.,University of Tokyo | Wang A.,Zhejiang University of Technology | And 3 more authors.
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2014

In this paper, we first propose a universal coupling between the gravity and matter in the framework of the Hořava-Lifshitz (HL) theory of gravity with an extra U(1) symmetry for both the projectable and nonprojectable cases. Then, using this universal coupling we study the post-Newtonian approximations and obtain the parametrized post-Newtonian (PPN) parameters in terms of the coupling constants of the theory. Contrary to the previous works in which only two PPN parameters were calculated, we obtain all PPN parameters. We then, for the first time in either projectable or nonprojectable cases, find that all the solar system tests carried out so far are satisfied in a large region of the parameter space. In particular, the same results obtained in general relativity can be easily realized here. A remarkable feature is that the solar system tests impose no constraint on the parameter λ appearing in the kinetic part of the action. As a result, the solar system tests, when combined with the condition for avoidance of strong coupling, do not lead to an upper bound on the energy scale M* that suppresses higher-dimensional operators in the theory. This is in sharp contrast to other versions of the HL theory. © 2014 American Physical Society.


Lu B.,Zhejiang University of Technology | Li M.,Zhejiang University of Technology | Yin R.,Cornell University
Critical Reviews in Food Science and Nutrition | Year: 2016

Edible flowers contain numerous phytochemicals which contribute to their health benefits, and consumption of edible flowers has increased significantly in recent years. While many researchers have been conducted, no literature review of the health benefits of common edible flowers and their phytochemicals has been compiled. This review aimed to present the findings of research conducted from 2000 to 2015 on the species, traditional application, phytochemicals, health benefits, and the toxicology of common edible flowers. It was found in 15 species of common edible flowers that four flavonols, three flavones, four flavanols, three anthocyanins, three phenolic acids and their derivatives were common phytochemicals and they contributed to the health benefits such as anti-oxidant, anti-inflammatory, anti-cancer, anti-obesity, and neuroprotective effect. Toxicology studies have been conducted to evaluate the safety of common edible flowers and provide information on their dosages and usages. © Taylor & Francis Group, LLC.


Ma C.,Zhejiang University of Technology | Bai S.,Zhejiang University of Technology | Peng X.,Zhejiang University of Technology | Meng Y.,Tsinghua University
Applied Surface Science | Year: 2013

Wettability on silicon carbide (SiC) substrates with laser processing micro-groove-liked structures was introduced to discuss the anisotropic wetting properties. The surface topography and chemical composition, on the polished and textured substrates were measured by energy dispersive X-ray analysis (EDX) and Raman measurement system (RS), respectively. Water contact angles in both parallel and perpendicular direction to grooves were also measured. Results show that chemical composition on the laser processed surface was almost the same with that on the polished surface, except for the content of O increased and the Si decreased. The contact angle in the parallel direction was larger than the perpendicular direction which indicates that the anisotropy was significant on the groove-liked textures. The difference of contact angle value between these two directions ranged from 15.7 to 47.4. While the difference would be less than 24, when both groove spacing and width were larger than 100 μm. The less the size of groove spacing and width was, the more obvious the anisotropy became. The findings may produce a promising way to reduce water adsorption on the gas seal surfaces. © 2013 Elsevier B.V. All rights reserved.


Ma C.,Zhejiang University of Technology | Bai S.,Zhejiang University of Technology | Peng X.,Zhejiang University of Technology | Meng Y.,Tsinghua University
Applied Surface Science | Year: 2013

In this paper, wetting behavior of laser micro-square-convexed silicon carbid (SiC) surfaces was studied, so as to achieve laser processed texture to improve hydrophobicity effectively. Micro-square textures of different roughness were fabricated by fiber optic laser. Then static angles and contact angles evolution over time were measured with a video contact angle analyzer. The results show that micro-square convex effectively changed wetting behavior of SiC surface, and the surfaces translated from hydrophilic to hydrophobic after laser processing. Hydrophobicity property increased with increase of surface roughness. The contact angle increased from 100.2° to 119° with increasing roughness from 1 μm to 3 μm, comparing to the untextured smooth surface of 89.8°. It may be expected to use the laser micro-protuberant structure to control the condensation of water droplets on the SiC surfaces. © 2012 Elsevier B.V. All rights reserved.


Chen S.,Zhejiang University of Technology | Wang Z.,International Max Planck Research School for Computer Science
IEEE Transactions on Industrial Informatics | Year: 2012

Generalized belief propagation is a popular algorithm to perform inference on large-scale Markov random fields (MRFs) networks. This paper proposes the method of accelerated generalized belief propagation with three strategies to reduce the computational effort. First, a min-sum messaging scheme and a caching technique are used to improve the accessibility. Second, a direction set method is used to reduce the complexity of computing clique messages from quartic to cubic. Finally, a coarse-to-fine hierarchical state-space reduction method is presented to decrease redundant states. The results show that a combination of these strategies can greatly accelerate the inference process in large-scale MRFs. For common stereo matching, it results in a speed-up of about 200 times. © 2006 IEEE.


Chen S.Y.,Zhejiang University of Technology | Zhang J.,University of Hamburg | Zhang H.,University of Hamburg | Zhang H.,Aalesund University College | And 2 more authors.
IEEE Transactions on Industrial Electronics | Year: 2012

The ability of a robot vision system to capture informative images is greatly affected by the condition of lighting in the scene. This paper reveals the importance of active lighting control for robotic manipulation and proposes novel strategies for good visual interpretation of objects in the workspace. Good illumination means that it helps to get images with large signal-to-noise ratio, wide range of linearity, high image contrast, and true color rendering of the object's natural properties. It should also avoid occurrences of highlight and extreme intensity unbalance. If only passive illumination is used, the robot often gets poor images where no appropriate algorithms can be used to extract useful information. A fuzzy controller is further developed to maintain the lighting level suitable for robotic manipulation and guidance in dynamic environments. As carried out in this paper, with both examples of numerical simulations and practical experiments, it promises satisfactory results with the proposed idea of active lighting control. © 2012 IEEE.


Ru Q.,Zhejiang University of Technology | Ru Q.,Rutgers University | Wang Y.,Rutgers University | Lee J.,Rutgers University | And 2 more authors.
Carbohydrate Polymers | Year: 2012

The turbidity and rheological properties of bovine serum albumin (BSA)/pectin coacervates show correlations with sodium chloride concentration (C NaCl) and initial protein/polysaccharide ratio (r). Increasing C NaCl from 0.01 to 0.4 M shifts the critical pH (pH φ1), which designates as the critical pH for BSA/pectin coacervate formation, to lower values, and the storage modulus (G') values of BSA/pectin coacervates tend to be smaller, which can be explained by a salt screening effect in the BSA/pectin coacervates. Moreover, an increase of r from 1:1 to 10:1 favors the formation of BSA/pectin coacervates, as indicated by the increase in pH φ1 and the decrease in pH φ2. The values of G' increase simultaneously. With further increase of r to 20:1, the pH φ1 changes negligibly and G' values become much lower. These results reflect that a balance between the positive charges of BSA and the negative charges of pectin favors the formation of BSA/pectin coacervates with more compact network structures. © 2012 Elsevier Ltd. All rights reserved.


Hu B.,East China University of Science and Technology | Meng M.,East China University of Science and Technology | Wang Z.,East China University of Science and Technology | Du W.,East China University of Science and Technology | And 4 more authors.
Journal of the American Chemical Society | Year: 2010

Novel planar chiral ferrocene nucleophilic catalysts (Fc-PIP) containing both central and planar chiral elements were designed and synthesized for catalytic enantioselective acyl transfer of secondary alcohols. A remarkably efficient catalyst with high selectivity factors (up to S = 1892) was identified. Comparing the combination of central and planar chirality revealed a strong requirement for the "matched" chiral elements, indicating that the stereogenic center of the imidazole rings should present itself on the same face as the ferrocenyl fragment; otherwise, the catalyst is completely inactive. An exclusively stacked transition state that accounts for the high selectivity of the kinetic resolution of secondary alcohols is proposed. Notably, this newly designed catalyst family is suitable for the catalytic kinetic resolution of bulky arylalkyl carbinols, producing esters with extremely high ee (>99%). © 2010 American Chemical Society.


Leng S.,Zhejiang University of Technology | Wang X.,Zhejiang University of Technology | Cai Q.,Zhejiang University of Technology | Ma F.,Xinjiang University | And 2 more authors.
Bioresource Technology | Year: 2013

Direct biomass conversion into chemicals remains a great challenge because of the complexity of the compounds; hence, this process has attracted less attention than conversion into fuel. In this study, we propose a simple one-step method for converting bagasse into furfural (FF) and acetic acid (AC). In this method, bagasse pyrolysis over ZnCl2/HZSM-5 achieved a high FF and AC yield (58.10%) and a 1.01 FF/AC ratio, but a very low yield of medium-boiling point components. However, bagasse pyrolysis using HZSM-5 alone or ZnCl2 alone still remained large amounts of medium-boiling point components or high-boiling point components. The synergistic effect of HZSM-5 and ZnCl2, which combines pyrolysis, zeolite cracking, and Lewis acid-selective catalysis results in highly efficient bagasse conversion into FF and AC. Therefore, our study provides a novel, simple method for directly converting biomass into high-yield useful chemical. © 2013 Elsevier Ltd.


Zhang X.,Wenzhou University | Zhang X.,CAS Institute of Automation | Hu W.,CAS Institute of Automation | Chen S.,Zhejiang University of Technology | Maybank S.,Birkbeck College
IEEE Transactions on Industrial Electronics | Year: 2014

Object tracking is viewed as a two-class 'one-versus-rest' classification problem, in which the sample distribution of the target over a short period of time is approximately Gaussian while the background samples are often multimodal. Based on these special properties, we propose a graph-embedding- based learning method, in which the topology structures of graphs are carefully designed to reflect the properties of the sample distributions. This method can simultaneously learn the subspace of the target and its local discriminative structure against the background. Moreover, a heuristic negative sample selection scheme is adopted to make the classification more effective. In applications to tracking, the graph-embedding-based learning is incorporated into a Bayesian inference framework cascaded with hierarchical motion estimation, which significantly improves the accuracy and efficiency of the localization. Furthermore, an incremental updating technique for the graphs is developed to capture the changes in both appearance and illumination. Experimental results demonstrate that, compared with the two state-of-the-art methods, the proposed tracking algorithm is more efficient and effective, particularly in dynamically changing and cluttered scenes. © 1982-2012 IEEE.


Zhang S.,Zhejiang University of Technology | Wu Y.,U.S. Center for Disease Control and Prevention | Zhang W.,Zhejiang University of Technology
ChemMedChem | Year: 2014

G-Quadruplexes are distinct nucleic acid secondary structures that are formed from G-rich DNA and RNA sequences; they are built around successive G-tetrads of Hoogsteen hydrogen-bonded guanine bases. The existence of G-quadruplex structures has been confirmed in the human telomere and genome, and their biological functions have been demonstrated. Thus, the prospect of using G-quadruplex structures as a novel target for drug design is important. This review focuses on structural polymorphism of G-quadruplexes on the basis of the classification of the strand number of the G-quadruplex formed and its interaction diversity with small molecules (G4-ligands) that display high affinity and, more importantly, selectivity. Also, we outlook some future challenges for G-quadruplex structure and ligand studies. Such information, together with the biological functions of for G-quadruplex, will be of crucial importance for the research and development of drugs that target G-quadruplexes formed from particular genes and human telomeres. Polymorphism & binding modes: G-Quadruplexes display structural polymorphism based on the number of strands in the formed G-quadruplex and the interaction of the G-quadruplex with small molecules (G4-ligands). The formation and/or stabilization of these structures by G4-ligands may be crucial for the research and development of drugs that target G-quadruplexes formed from particular genes and human telomeres. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Zhou Y.,Jiangxi University of Science and Technology | Hu X.,Zhejiang University of Technology | Xiao Y.,Jiangxi University of Science and Technology | Shu Q.,Jiangxi University of Science and Technology
Electrochimica Acta | Year: 2013

Hollow mesoporous tungsten trioxide microsphere (HMTTS) was synthesized by spay drying methodand Pt/HMTTS were prepared and used as new electrocatalyst for methanol oxidation. The structureof HMTTS and Pt/HMTTS was characterized with scanning electron microscopy (SEM), tunnel electronmicroscopy (TEM) and X-ray diffraction (XRD), and its electrocatalytic activity toward methanol oxida-tion was investigated with cyclic voltammetry (CV) and chronoamperometry (CA). The characterizationsfrom SEM, TEM and XRD show that the platinum particles with an average size of 5 nm have been suc-cessfully distributed on the surface of HMTTS. Cyclic voltammetry and chronoamperometry indicate thatPt/HMTTS catalyst exhibits higher electrocatalytic activity and good stability during methanol oxidationin comparison to Pt/C and Pt/WO3catalysts.


Du L.-H.,Zhejiang University of Technology | Luo X.-P.,Zhejiang University of Science and Technology
RSC Advances | Year: 2012

The highly regioselective synthesis of sugar 6-monoesters with sugar and vinyl carboxylate in a flow microreactor using Lipozyme TL IM from Thermomyces lanuginosus as a catalyst has been developed. The important features of this method include mild reaction conditions, short reaction times (30 min), high yields and high regioselectivities. © 2012 The Royal Society of Chemistry.


Fan J.,Zhejiang University of Technology | Fan J.,Zhejiang University of Science and Technology | Feng D.,Zhejiang University of Technology
International Journal of Production Research | Year: 2013

A new concept is presented in this paper of quasi-dynamic cell formation for the design of a cellular manufacturing system, based on analysing the fact that static and dynamic cell formation could not reflect the real situation of a modern cellular manufacturing system. Further, workforce resources are integrated into quasi-dynamic cell formation and thus a quasi-dynamic dual-resource cell-formation problem is proposed. For solving this problem, this paper first establishes a non-linear mixed integer programming model, where inter-cell and intra-cell material cost, machine relocation cost, worker operation time, loss in batch quality and worker salary are to be minimised. Then, a multi-objective GA is developed to solve this model. Finally, a real life case study is conducted to validate the proposed model and algorithm. The actual operation results show that the case enterprise significantly decreases its material handling cost and workforce number and obviously increases its product quality after carrying out the obtained scheme. © 2013 Copyright Taylor and Francis Group, LLC.


Huang G.,Taizhou University | Zhuo A.,Zhejiang University of Science and Technology | Wang L.,East China University of Science and Technology | Wang X.,Zhejiang University of Technology
Materials Chemistry and Physics | Year: 2011

A phosphorus-nitrogen containing compound, N-(2-(5,5-dimethyl-1,3,2- dioxaphosphinyl-2-ylamino)-N-hexylformamide-2-propenyl acid (DPHPA), was synthesized and characterized. A novel flame retardant, namely DPHPA modified layered double hydroxides (DPHPA-LDHs), was prepared by ion-exchange of LDHs with DPHPA. The results from FT-IR, XPS, XRD and TEM showed that DPHPA intercalated LDHs and PMMA-DPHPA-LDHs nanocomposites had been prepared by in situ polymerization of PMMA with flame retardant DPHPA-LDHs. The storage modulus (E′) and glass transition temperature (Tg) of the nanocomposites were enhanced by incorporating DPHPA-LDHs into the PMMA. The results of flammability showed that the addition of flame retardant DPHPA-LDHs enhanced the flame retardancy of PMMA significantly. Compared to pure PMMA, the PHRR of the nanocomposites filled with 5 wt% DPHPA-LDHs is reduced by about 35%. The results of SEM and TEM showed that a compact and dense intumescent char is formed for PMMA-DPHPA-LDHs nanocomposites after combustion. The functionalization of LDHs by intumescent flame retardant DPHPA can improve both the dispersion of LDHs in the polymer matrix and flame retardancy of the nanocomposites. © 2011 Elsevier B.V. All rights reserved.


Wu Y.,U.S. Center for Disease Control and Prevention | Ding Y.,U.S. Center for Disease Control and Prevention | Tanaka Y.,Kyoto University | Zhang W.,Zhejiang University of Technology
International journal of medical sciences | Year: 2014

Type 2 diabetes is a serious and common chronic disease resulting from a complex inheritance-environment interaction along with other risk factors such as obesity and sedentary lifestyle. Type 2 diabetes and its complications constitute a major worldwide public health problem, affecting almost all populations in both developed and developing countries with high rates of diabetes-related morbidity and mortality. The prevalence of type 2 diabetes has been increasing exponentially, and a high prevalence rate has been observed in developing countries and in populations undergoing "westernization" or modernization. Multiple risk factors of diabetes, delayed diagnosis until micro- and macro-vascular complications arise, life-threatening complications, failure of the current therapies, and financial costs for the treatment of this disease, make it necessary to develop new efficient therapy strategies and appropriate prevention measures for the control of type 2 diabetes. Herein, we summarize our current understanding about the epidemiology of type 2 diabetes, the roles of genes, lifestyle and other factors contributing to rapid increase in the incidence of type 2 diabetes. The core aims are to bring forward the new therapy strategies and cost-effective intervention trials of type 2 diabetes.


Xu X.,Zhejiang University of Technology | Chen S.,Zhejiang University of Technology | Tang W.,Zhejiang Himpton New Material Co. | Qu Y.,Zhejiang Himpton New Material Co.
Polymer Degradation and Stability | Year: 2014

Basic zinc cyanurate (Zn3(C3N3O 3)2·ZnO, represented as Zn3Cy 2) was synthesized via a precipitation method, and investigated as a thermal stabilizer for poly(vinyl chloride) (PVC) by thermogravimetric analysis (TGA), Congo red test and discoloration test. The thermal stability of PVC was significantly enhanced with the addition of Zn3Cy2. Compared with zinc stearate (ZnSt2), it is observed a significant improvement that Zn3Cy2 could delay the "zinc burning" of PVC. This is attributed to the strong ability of the cyanurate anions in Zn3Cy2 to absorb the hydrogen chloride released by the degradation of PVC. Moreover, mixing Zn3Cy2 with calcium stearate (CaSt2) in different mass ratios greatly promoted the thermal stability of PVC. Excellent synergistic effects could be observed when CaSt2/Zn3Cy2 combined with some commercial auxiliary stabilizers. Addition of dibenzoylmethane (DBM) brought a remarkable increase in initial color for PVC containing CaSt2/Zn 3Cy2 while epoxidized soybean oil (ESBO) could improve both initial color and long-term stability. ©2013 Elsevier Ltd. All rights reserved.


Wu Y.-L.,U.S. Center for Disease Control and Prevention | Ding Y.-P.,U.S. Center for Disease Control and Prevention | Gao J.,U.S. Center for Disease Control and Prevention | Tanaka Y.,Kyoto University | Zhang W.,Zhejiang University of Technology
International Journal of Biological Sciences | Year: 2013

Type 1 diabetes mellitus (TIDM) is a chronic autoimmune disease resulting in the designated immune destruction of insulin producing β-cells, usually diagnosed in youth, and associated with important psychological, familial, and social disorders. Once diagnosed, patients need lifelong insulin treatment and will experience multiple disease-associated complications. There is no cure for TIDMcurrently. The last decade has witnessed great progress in elucidating the causes and treatment of the disease based on numerous researches both in rodent models of spontaneous diabetes and in humans. This article summarises our current understanding of the pathogenesis of T1DM, the roles of the immune system, genes, environment and other factors in the continuing and rapid increase in TIDMincidence at younger ages in humans. In addition, we discuss the strategies for primary and secondary prevention trials of TIDM. The purpose of this review is to provide an overview of this disorder's pathogenesis, risk factors that cause the disease, as well as to bring forward an ideal approach to prevent and cure the disorder. © Ivyspring International Publisher.


Huang Z.,Zhejiang University of Technology | Du X.,Zhejiang University of Science and Technology
Habitat International | Year: 2015

Improving public housing allocation efficiency and residential satisfaction is the key to the better realization of the social inclusion goals. We assess residential satisfaction with public housing and examine its determinants, based on the Hangzhou public housing household survey. We found that neighborhood environment, public facilities and housing characteristics are the main factors that influence residential satisfaction. Public housing allocation scheme, social environment and residence comparison also have influences. Among the four types of public housing, cheap rental housing has the highest residential satisfaction, followed by public rental and monetary subsidized housing, while economic comfortable housing has the lowest residential satisfaction. The residents in public rental and monetary subsidized housing pay more attention to the neighborhood environment, residents in cheap rental housing are more concerned about the housing and neighborhood characteristics, and economic comfortable housing residents care more about the neighborhood characteristics and public facilities. Therefore, the government should not only improve the physical environment of public housing, but also the public housing allocation scheme and social environment. The different needs of public housing residents should also be considered to improve residential satisfaction and the allocation efficiency of public housing. © 2015 Elsevier Ltd.


Liang J.,Zhejiang University of Technology | Wu Y.-L.,U.S. Center for Disease Control and Prevention | Chen B.-J.,Zhejiang University of Technology | Zhang W.,Zhejiang University of Technology | And 2 more authors.
International Journal of Biological Sciences | Year: 2013

As an important member of tyrosine kinase family, c-kit receptor causes specific expression of certain genes, regulates cell differentiation and proliferation, resists cell apoptosis, and plays a key role in tumor occurrence, development, migration and recurrence through activating the downstream signaling molecules following interaction with stem cell factor (SCF). The abnormality of SCF/c-kit signaling pathway is closely related to some certain tumors. The discovery of c-kit receptor- targeted drugs has promoted clinical-related cancer's diagnosis and treatment. In this paper, we review recent research progress on c-kit receptor-mediated signal transduction and its potential therapeutic application as a target in tumor-related diseases. © Ivyspring International Publisher.


Yi T.-F.,Anhui University of Technology | Yi T.-F.,Harbin Institute of Technology | Yi T.-F.,Chilwee Power Co. | Yang S.-Y.,Anhui University of Technology | And 4 more authors.
Journal of Power Sources | Year: 2014

The spinel Li4Ti5O12 has been doped by Na for the purpose of improving its cycle performance as an anode. The lattice parameter of Li4Ti5O12 increases due to the Na doping. SEM shows that all materials are well crystallized with a particle size in the range of 400-600 nm. The pristine Li4Ti5O 12 sample has a bigger particle size than that of Na-doped samples. Although the doping does not change the crystallographic structure of Li 4Ti5O12, they exhibit better cyclability at high charge-discharge rate compared with pristine Li4Ti 5O12. Li3.85Na0.15Ti 5O12 gives the best cycling performance, only 11.1% loss of capacity after 80 cycles at 2 C charge-discharge rate. Na-doped Li 4Ti5O12 exhibits lower potential separation, indicating faster electron transfer kinetics and cycling reversibility. Electrochemical impedance spectroscopy demonstrates that the improved performance of the Na-doped Li4Ti5O12 is due to a small decrease in the charge transfer resistance, indicating high electrochemical activity during cycling. The excellent cycling and safety performance of the Na-doped Li4Ti5O12 electrodes are found to be due to the significantly increased ionic and electronic conductivity. Since fast charge-discharge performance is an important factor that needs to be considered in fabricating power batteries in industry, the Na-doped Li4Ti5O12 materials moves closer to real and large scale applications. © 2013 Elsevier B.V. All rights reserved.


Wang Y.-F.,Zhejiang University of Technology | Chen R.-X.,Zhejiang University of Technology | Wang K.,Zhejiang University of Technology | Zhang B.-B.,Zhejiang University of Technology | And 2 more authors.
Green Chemistry | Year: 2012

The chiral squaramide derivatives as hydrogen bonding catalyst for the Michael addition reactions of 1,3-dicarbonyl compounds to nitroolefins under solvent-free conditions was developed using a planetary ball mill. High yields, high enantioselectivities and shorter reaction times were achieved with low catalyst loading. © 2012 The Royal Society of Chemistry.


Chen J.,Zhejiang University of Technology | Chen J.,Wenzhou University | Li J.,Zhejiang University of Technology | Su W.,Zhejiang University of Technology
Organic and Biomolecular Chemistry | Year: 2014

The first example of the palladium-catalyzed one-pot synthesis of 2-arylbenzofurans in moderate to excellent yields via a tandem reaction of 2-hydroxyarylacetonitriles with sodium sulfinates is reported. A plausible mechanism for the formation of 2-arylbenzofurans involving desulfinative addition and intramolecular annulation reactions is proposed. Moreover, the present synthetic route to benzofurans could be readily scaled up to the gram quantity without any difficulty. Thus, the method represents a convenient and practical strategy for synthesis of benzofuran derivatives. This journal is © the Partner Organisations 2014.


Shen L.,Wenzhou University | Huang D.,Zhejiang University of Technology
International Journal of Advancements in Computing Technology | Year: 2012

This paper has discussed the performance of MoCell for balancing accuracy and interpretability objectives in learning fuzzy rule base classifiers and provided a comparison with SPEA2, NSGAII and FastPGA. In our tests of learning fuzzy classifiers, we are able to identify similar characteristics in performance by using MoCell which helps to find more diverse tradeoffs between interpretability and accuracy objectives. In addition, there are some unique characteristics which seem to be associated with solutions founded using cellular evolution - in particular this approach seems to find rule bases whose performance out of sample are much closer to those of sample training performance.


Xu Y.,Jiangnan University | Xia W.,Jiangnan University | Yang F.,Jiangnan University | Kim J.M.,Jiangnan University | Nie X.,Zhejiang University of Technology
Food Chemistry | Year: 2010

The effect of fermentation with Pediococcus pentosaceus at different temperatures ranging from 15 to 37 °C on the quality characteristics of silver carp sausages was investigated. Higher temperature stimulated the rapid growth of lactic acid bacteria, resulting in a rapid decline in pH, and consequently suppressed the growth of Pseudomonas, Micrococcaceae and Enterobacteriaceae. However, increasing fermentation temperature gave a progressive increase in total volatile basic nitrogen and biogenic amines in fermented silver carp sausages. Histamine was the main biogenic amine, exceeding 100 mg/kg after 48 h of fermentation at temperatures above 30 °C. Higher content of non-protein nitrogen and α-amino nitrogen correlated with the electrophoretic studies, which showed that proteolysis of high molecular weight myofibrillar and sarcoplasmic proteins was more prominent at higher fermentation temperatures. Products fermented at 23-30 °C showed greatest consumer preference and most favourable textural properties. © 2009.


Wu Y.-L.,U.S. Center for Disease Control and Prevention | Pandian G.N.,Kyoto University | Ding Y.-P.,U.S. Center for Disease Control and Prevention | Zhang W.,Zhejiang University of Technology | And 2 more authors.
Chemistry and Biology | Year: 2013

Adult mammals possess limited ability to regenerate their lost tissues or organs. The epoch-making strategy of inducing pluripotency in somatic cells incorporates multiple applications in regenerative medicine. However, concerns about the clinical translation of induced pluripotent stem (iPS) cells still exist because of the occurrence of aberrancies, even in genome integration-free methods. As cellular reprogramming is multi-gene-oriented, versatile, bioactive small molecules could concomitantly modulate the transcriptional machinery and aid the generation of clinical grade iPS cells. The availability of optimal cell sources has additional influence on the clinical translation of iPS cells. Herein we provide a critical overview of methods and cell sources available for iPS cell production. We think the review will be a useful resource for researchers who aim to develop small molecules for speeding up the journey of iPS cells from the laboratory to the clinic. © 2013 The Authors.


Yang Z.-X.,Xinjiang University | Shao Y.-H.,Zhejiang University of Technology | Zhang X.-S.,CAS Academy of Mathematics and Systems Science
Neural Computing and Applications | Year: 2013

For multi-class classification problem, a novel algorithm, called as multiple birth support vector machine (MBSVM), is proposed, which can be considered as an extension of twin support vector machine. Our MBSVM has been compared with the several typical support vector machines. From theoretical point of view, it has been shown that its computational complexity is remarkably low, especially when the class number K is large. Based on our MBSVM, the dual problems of MBSVM are equivalent to symmetric mixed linear complementarity problems to which successive overrelaxation (SOR) can be directly applied. We establish our SOR algorithm for MBSVM. The SOR algorithm handles one data point at a time, so it can process large dataset that need no reside in memory. From practical point of view, its accuracy has been validated by the preliminary numerical experiments. © 2012 Springer-Verlag London Limited.


Katayev D.,University of Geneva | Jia Y.-X.,University of Geneva | Jia Y.-X.,Zhejiang University of Technology | Sharma A.K.,Indian Institute of Technology Bombay | And 4 more authors.
Chemistry - A European Journal | Year: 2013

Palladium complexes incorporating chiral N-heterocyclic carbene (NHC) ligands catalyze the asymmetric intramolecular α-arylation of amides producing 3,3-disubstituted oxindoles. Comprehensive DFT studies have been performed to gain insight into the mechanism of this transformation. Oxidative addition is shown to be rate-determining and reductive elimination to be enantioselectivity-determining. The synthesis of seven new NHC ligands is detailed and their performance is compared. One of them, L8, containing a tBu and a 1-naphthyl group at the stereogenic centre, proved superior and was very efficient in the asymmetric synthesis of fifteen new spiro-oxindoles and three azaspiro-oxindoles often in high yields (up to 99 %) and enantioselectivities (up to 97 % ee; ee=enantiomeric excess). Three palladacycle intermediates resulting from the oxidative addition of [Pd(NHC)] into the aryl halide bond were isolated and structurally characterized (X-ray). Using these intermediates as catalysts showed alkene additives to play an important role in increasing turnover number and frequency. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Jia X.Q.,Zhejiang University of Technology | Jia X.Q.,Chungnam National University | Xu Z.N.,Zhejiang University | Zhou L.P.,Zhejiang University of Technology | Sung C.K.,Chungnam National University
Metabolic Engineering | Year: 2010

The application of the high-producing pigments industrial strain Monascus purpureus SM001 has been greatly limited by the synchronous production of mycotoxin citrinin. Here we have tried both traditional mutagenesis and metabolic engineering methods to eliminate the production of citrinin. Traditional chemical and physical mutagens were applied to induce mutagenesis, and a bio-screening method based on the antibacterial activity of citrinin against Bacillus subtilis was designed to select mutants. Among the resulting four citrinin-free mutants, only mutant MU2411 can maintain the similar pigments yield. A binary vector system was constructed and successfully disrupted the polyketide synthase gene pksCT in M. purpureus SM001 through the Agrobacterium tumefaciens-mediated transformation. The resulting citrinin-free ΔpksCT mutants maintained the same level of pigments yield. The established Monascus genetic system was comprehensively evaluated and showed high efficiency and specificity, which provides us a potential approach to manipulate and improve industrial Monascus strains. © 2009 Elsevier Inc. All rights reserved.


Xu Y.,Jiangnan University | Xia W.,Jiangnan University | Yang F.,Jiangnan University | Nie X.,Zhejiang University of Technology
Food Chemistry | Year: 2010

Changes in protein composition and physicochemical properties of silver carp sausages during fermentation were investigated. As fermentation progressed, the amount of salt-soluble and water-soluble proteins decreased gradually with a concomitant increase in insoluble proteins and non-protein constituents. The rapid reduction in pH to 4.5 within 48 h of fermentation coincided with a progressive increase in titratable acidity. The increasing content of TCA-soluble peptides during fermentation indicated intensive degradation of muscle proteins. SDS-PAGE showed that muscle proteins tended to aggregate into large polymers through disulphide bonds and non-disulphide covalent bonds during fermentation, which may be responsible for the formation of superior textural properties of silver carp sausages. © 2010.


Chen W.,Zhejiang University of Technology | Zhou S.,Wenzhou University | Zheng X.,Zhejiang University of Technology
LWT - Food Science and Technology | Year: 2015

Chinese bayberry is one of the most popular and valuable fruits due to its special sweet/sour taste. It also has been traditionally used to treat gastric intestinal problems, such as diarrhea and gastroenteritis. However, the efficacy of protection against oxidative DNA damage of bayberry is still unclear. This study was conducted to evaluate the antioxidant activities of bayberry extract and its protective role against oxidative DNA damage and cytotoxicity. Bayberry was initially partitioned by extracting with solvents of increasing polarities, petroleum ether, ethyl acetate, N-butanol and water. These different extracts can effectively scavenge multiple free radicals (including DPPH free radical, hydroxyl radical, ABTS free radical, and superoxide anion radical) in a concentration-dependent manner. Among these, water extract showed the greatest free radical scavenging activity. Our results further indicated that the presence of water extract (25μg/mL) was found to significantly inhibit peroxynitrite-induced DNA damage, cellular ROS increase, disruption of mitochondrial membrane potential and cytotoxicity in rat primary astrocytes. Taken together, these results demonstrate that bayberry extract had a profound antioxidant effect and can protect against peroxynitrite-mediated oxidative DNA damage and cytotoxicity, which might have implications for neuroprotection. © 2014 Elsevier Ltd.


Xiang J.,Zhejiang University of Science and Technology | Liang R.,Zhejiang University of Technology
Signal Processing | Year: 2015

Motion synthesis and recognition based on 3D motion data has been extensively studied in recent years. In this paper, we extract a dimensional representation of human motions from 3D spatial-temporal features and map this representation to low-dimensionality subspaces, which can preserve the intrinsic properties of original data. A method for automatic quantitative synthesis of human motion styles is then proposed. These methods help to make recognition and classification of 3D motion data more efficient, reducing computational complexity whilst preserving the intrinsic properties of original data. This also makes it useful for animation authoring systems and motion recognition. Experimental results show the effectiveness of the proposed methods. © 2014 Elsevier B.V.


Xu Y.,Zhejiang University of Technology | Hu J.T.,Zhejiang University of Technology | Yan J.,Zhejiang University of Technology
Chinese Chemical Letters | Year: 2012

An effective and environmentally benign benzylic oxidation for transition of alkylarenes into the corresponding carbonyl compounds was reported. Alkylarenes were mixed and stirred with potassium bromide, m-chloroperbenzoic acid and a catalytic amount of iodobenzene in water at 60 °C for several hours, a series of the corresponding carbonyl compounds was obtained in moderate to good yields. In the reaction, iodobenzene was first oxidized by m-chloroperbenzoic acid into the hypervalent iodine intermediate which then reacted with potassium bromide to form the key radical initiator for the benzylic oxidation. © 2012 Jie Yan. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.


Zheng H.,Zhejiang University of Technology | Chen Z.,Zhejiang University of Technology | Li Y.,Zhejiang University of Technology | Ma C.,Zhejiang University of Technology
Electrochimica Acta | Year: 2013

The mesoporous material ordered mesoporous carbon/tungsten carbide (OMC/WC) was prepared andused as electrocatalyst for methanol electro-oxidation. WC embedded OMCs was synthesized throughcarbothermal reactions with a blow of argon and hydrogen by employing ammonium metatungstate asa precursor. In this method, because OMC acted both as the support and the carbon sources, not only thesurface area of materials is enlarged, but also the generation of deposit carbon which covers the activesites can be effectively avoided. The characterization, which carried out by X-ray diffraction, Transmissionelectron microscopy and N2adsorption-desorption measurement showed a homogeneous distributionof WC throughout the surface of the mesoporous carbon and the surface area of OMC/WCs was up to344 m2/g. Electro-catalytic properties and mechanism of methanol oxidation on the OMC/WCs electrodehas been investigated using cyclic voltammetry and in situ FTIR technique. The results showed that therewas only one characteristic methanol oxidation peak during the whole potential scan on the OMC/WCselectrode surface, it also showed an improved CO tolerance of the WC surface. It proved that tungstencarbide had good electro-catalytic property close to that of the Pt-based materials for methanol oxidationand provided a new idea for developing electrode materials in the future. © 2013 Published by Elsevier Ltd.


Geng Y.,Zhejiang University of Technology | Wang H.-L.,Zhejiang University of Technology | Chen Z.-S.,Zhejiang University of Technology
Guangzi Xuebao/Acta Photonica Sinica | Year: 2015

With finite element method, a hexagon High Birefringence Photonic Crystal Fiber (HB-PCF) with two zero-dispersion dots and CdSe/ZnS quantum dots film was designed. The dispersion and loss characteristics of the designed HB-PCFs with the different thickness of CdSe/ZnS quantum dots films were analyzed. The results show that HB-PCFs with CdSe/ZnS quantum dots films exist the fundamental modes along the x- and y-axes of fibers. As pump wavelength increases, the birefringence of HB-PCFs with the same thickness of CdSe/ZnS quantum dots films increases gradually. And their dispersions increase first and then decrease along the x- and y-axes of fiber. The losses of HB-PCFs are close to zero in the visible region while they increase gradually in the infrared region. For the different thickness of CdSe/ZnS quantum dots films, the birefringence of HB-PCFs decreases gradually with the increase of quantum dot film thickness for the same pump wavelength. Their dispersions decrease gradually along the x- and y-axes of fiber, and their two zero-dispersion dots are close to each other, and their losses increase gradually. These research results indicate that the dispersions and losses of the HB-PCFs can be controlled effectively in experiment by depositing the different thickness of CdSe/ZnS quantum dots films and choosing a suitable pump wavelength. ©, 2015, Chinese Optical Society. All right reserved.


Zhao M.,Zhejiang University of Technology | Wang C.,Zhejiang University of Technology | Zhang C.,University of Houston-Clear Lake | Wen Y.,Zhejiang University | Liu W.,Zhejiang University
PLoS ONE | Year: 2012

Background: The continued uses of dichlordiphenyltrichloroethane (DDT) for indoor vector control in some developing countries have recently fueled intensive debates toward the global ban of this persistent legacy contaminant. Current approaches for ecological and health risk assessment has ignored the chiral nature of DDT. In this study by employing an array of cytotoxicity related endpoints, we investigated the enantioselective cytotoxicity of o,p'-DDT. Principal Findings: we demonstrated for the first time that R-(-)-o,p'-DDT caused more neuron cell death by inducing more severe oxidative stress, which selectively imbalanced the transcription of stress-related genes (SOD1, SOD2, HSP70) and enzyme (superoxide dismutase and lactate dehydrogenase) activities, and greater cellular apoptosis compared to its enantiomer S-(+)-o,p'-DDT at the level comparable to malaria area exposure (parts per million). We further elucidated enantioselective modes of action using microarray combined with enzyme-linked immunosorbent assay. The enantioselective apoptosis might involve three signaling pathways via caspase 3, tumor protein 53 (p53) and NFkB. Conclusions: Based on DDT stereochemistry and results reported for other chiral pesticides, our results pointed to the same directional enantioselectivity of chiral DDT toward mammalian cells. We proposed that risk assessment on DDT should consider the enantiomer ratio and enantioselectivities. © 2012 Zhao et al.


Xu Y.H.,Zhejiang University of Technology | Cai Q.Q.,Zhejiang University of Technology | Ma H.X.,Zhejiang University of Technology | He Y.,Zhejiang University of Technology | And 2 more authors.
Electrochimica Acta | Year: 2013

Electrocatalytic hydrogenolysis (ECH) dechlorination of 2,4-dichlorophenoxyacetic acid (2,4-D) in an aqueous solution was investigated at room temperature using a roughened silver-palladium cathode (Pd/Ag(r) cathode) in batch-mode electrolysis experiments. The Pd/Ag(r) cathode was prepared by galvanic replacement reaction (GRR) of a roughened silver (Ag(r)) electrode with PdCl2 solution. The effect of preparation conditions on the catalytic activity and stability of the Pd/Ag(r) cathode and of operating parameters on the rate and current efficiency (CE) of the ECH dechlorination reaction were evaluated. In particular, the ECH dechlorination mechanism of 2,4-D was analysed with regard to the dependence of dechlorination efficiency on the different operating parameters. Moreover, preliminary assessments of product selectivity and carbon mass balance of the dechlorination reaction were carried out. The results demonstrate that a moderate GRR time and GRR temperature favoured the catalytic activity and cathode stability and that a basic aqueous solution without ethanol, high 2,4-D concentration, and moderate current density had the most beneficial effects on the dechlorination process. Under the optimised conditions, 25 mM of 2,4-D could be selectively dechlorinated to phenoxyacetic acid with 85% yield and 66% CE at 298 K after 6 h electrolysis. The only products generated during the electrolysis process were phenoxyacetic acid, 2-chlorophenoxyacetic acid, and 4-chlorophenoxyacetic acid. © 2013 Elsevier Ltd.


Fang Z.,Zhejiang University of Technology
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2010

The study presents a novel quantum immune algorithm (QIA) for solving the parallel machine scheduling in the textile manufacturing industry. In this proposed algorithm, there are distinct characteristics as follows. First, the encoding method is based on Q-bit representation. Second, a novel mutation operator with a chaos-based rotation gate is proposed. Most importantly, two diversity schemes, suppression algorithm and similarity-based truncation algorithm, are employed to preserve the diversity of the population, and a new selection scheme is proposed to create the new population. Simulation results show that QIA is better than two quantum-inspired evolutionary algorithms. © 2010 Springer-Verlag.


Yang H.,Zhejiang University of Technology | Kuang B.,Cranfield University | Mouazen A.M.,Cranfield University
Key Engineering Materials | Year: 2011

Instrumental measurement of soil properties are affected by several factors including soil texture. The classification of soil texture can help improve the accuracy of calibration models for soil measurement. In the study, the effect of soil particle size on the selection of preprocessing methods for principle component analysis (PCA) of soil classification was examined. Total 178 soil samples with five textures were collected from Silsoe Farm, Cranfield, England. After dried and ground, soil samples sieved by a 2mm sieve were named by Mixed Group. A Vis/NIR spectrophotometer (LabSpec2500, spectral range 350-2200nm, ASD) was used for spectral scanning of soil samples. After that, all samples were sieved by a 1mm sieve and divided into two groups: one with particle size less than 1mm named by Thin Group and another with particle size between 1mm and 2mm named by Thick Group. Preprocessing methods of moving average with segment size of 5(MA5), standard normal variation (SNV) and 1st Savitzky-Golay derivatives with smoothing points of 3(Der1(3)) were examined. PCA was applied to evaluate the discriminative capacity of MA5, MA5+SNV and MA5+Der1(3). The score plots of 1st∼2nd and 2nd∼3rd PCs show that MA5+Der1(3) is the best preprocessing method not only for Thick Group and Thin Group, but also for Mixed Group. MA5+SNV is suitable for Thick Group and Thin Group but does not perform well for Mixed Group. Only MA5 does not perform well in any of three groups. The study suggests that pre-processing with 1st derivative is an essential step for soil classification with various particle sizes using Vis/NIR spectroscopy.


Wu H.,Zhejiang University of Technology | Liu R.-R.,Zhejiang University of Technology | Jia Y.-X.,Zhejiang University of Technology
Synlett | Year: 2014

Construction of all-carbon quaternary stereocenter by asymmetric Friedel-Crafts alkylation reaction remains a significant challenge. By the introduction of CF3 group at the β-position of nitroalkene, a highly enantioselective Friedel-Crafts reaction of indoles with β-CF 3-β-substituted nitroalkenes was achieved using Ni(ClO 4)2-bisoxazoline complex as a catalyst, which afforded indole-bearing chiral compounds with trifluoromethylated all-carbon quaternary stereogenic centers in good yields and excellent enantioÂselectivities. © Georg Thieme Verlag Stuttgart New York.


Liu X.-H.,Zhejiang University of Technology | Zhao W.-G.,Nankai University | Wang B.-L.,Nankai University | Li Z.-M.,Nankai University
Research on Chemical Intermediates | Year: 2012

A series of novel 1,2,3-thiadiazole derivatives were designed and synthesized. Their structures were characterized by 1H NMR, MS and HRMS. The bioactivity tests indicated that compound 9b exhibits a favorable KARI inhibition rate, and some of these novel compounds also showed moderate herbicidal activity against Brassica campestris. © Springer Science+Business Media B.V. 2012.


Xiang Y.,Zhejiang University of Technology | He B.,Zhejiang University of Technology | Li X.,Zhejiang University of Technology | Zhu Q.,Zhejiang University of Technology
RSC Advances | Year: 2013

We report the design and synthesis of a new class of fluorogenic probes based on a monoamine oxidase-B (MAO-B)-catalyzed α-carbon oxidation-hydrolysis mechanism. The cell-permeable probes exhibited good selectivity and sensitivity towards MAO-B, and a turn-on response in fluorescence intensity in living cells. © 2013 The Royal Society of Chemistry.


Tsang M.-K.,Hong Kong Polytechnic University | Ye W.,Hong Kong Polytechnic University | Ye W.,Zhejiang University of Technology | Wang G.,Beijing Hospital of the Ministry of Health | And 3 more authors.
ACS Nano | Year: 2016

Ebola outbreaks are currently of great concern, and therefore, development of effective diagnosis methods is urgently needed. The key for lethal virus detection is high sensitivity, since early-stage detection of virus may increase the probability of survival. Here, we propose a luminescence scheme of assay consisting of BaGdF5:Yb/Er upconversion nanoparticles (UCNPs) conjugated with oligonucleotide probe and gold nanoparticles (AuNPs) linked with target Ebola virus oligonucleotide. As a proof of concept, a homogeneous assay was fabricated and tested, yielding a detection limit at picomolar level. The luminescence resonance energy transfer is ascribed to the spectral overlapping of upconversion luminescence and the absorption characteristics of AuNPs. Moreover, we anchored the UCNPs and AuNPs on a nanoporous alumina (NAAO) membrane to form a heterogeneous assay. Importantly, the detection limit was greatly improved, exhibiting a remarkable value at the femtomolar level. The enhancement is attributed to the increased light-matter interaction throughout the nanopore walls of the NAAO membrane. The specificity test suggested that the nanoprobes were specific to Ebola virus oligonucleotides. The strategy combining UCNPs, AuNPs, and NAAO membrane provides new insight into low-cost, rapid, and ultrasensitive detection of different diseases. Furthermore, we explored the feasibility of clinical application by using inactivated Ebola virus samples. The detection results showed great potential of our heterogeneous design for practical application. © 2015 American Chemical Society.


Xiong Y.,Zhejiang University of Technology
Materials Science and Engineering A | Year: 2016

Fatigue damage evolution of extruded AZ31B magnesium (Mg) alloy is investigated under strain-controlled tension-compression loading along the extrusion direction at various strain amplitudes, and the different cyclic deformation behaviors are observed. At the strain amplitude of 2%, the tensile peak stress displays significant cyclic softening, whereas the compressive peak stress shows consistent cyclic hardening. At 1%, moderate cyclic hardening is observed at both the tensile peak and compressive peak stresses. At 0.5%, the tensile peak stress presents stable cyclic hardening, whereas the compressive peak stress almost keeps constant. The microstructure morphologies associated with the cyclic deformation are analyzed by scanning electronic microscope (SEM). The degree of deformation twins is evaluated by analyzing X-ray diffraction (XRD) using a normalized parameter λ. The results show the fatigue crack initiation modes and its propagation modes are dependent on the strain amplitude. At 2%, grain boundary (GB) cracking and triple joint cracking are detected after 1st loading cycle. At 1%, fatigue crack initiates at grain boundary (GB cracking), twin boundary (TB cracking) and triple joint of three neighboring grains. Both grain boundary induced (GB-induced) intergranular and persistent slip band induced (PSB-induced) transgranular propagation modes play an important role in the early-stage crack growth. At 0.5%, crack initiation modes are similar to that at 1%, but GB-induced intergranular propagation mode dominates the early-stage crack growth. The effects of the microstructure (texture, grain size and uniformity) on the fatigue damage behavior are discussed. © 2016 Elsevier B.V.


Li G.,Zhejiang University of Technology | Zhu Z.,Zhejiang University of Technology | Yang D.,Colorado School of Mines | Chang L.,Zhejiang University of Technology | Bai H.,Zhejiang University of Technology
IEEE Transactions on Signal Processing | Year: 2013

This paper considers the problem of designing the projection matrix \Phi for a compressive sensing (CS) system in which the dictionary \Psi is assumed to be given. The optimal projection matrix design is formulated in terms of finding those \Phi such that the Frobenius norm of the difference between the Gram matrix of the equivalent dictionary \Phi \Psi and the identity matrix is minimized. A class of the solutions is derived in a closed-form, which is a generalization of the existing results. More interestingly, it is revealed that this solution set is characterized by an arbitrary orthonormal matrix. This freedom is then used to further enhance the performance of the CS system by minimizing the coherence between the atoms of the equivalent dictionary. An alternating minimization-based algorithm is proposed for solving the corresponding minimization problem. Experiments are carried out and simulations show that the projection matrix obtained by the proposed approach significantly improves the signal recovery accuracy of the CS system and outperforms those by existing algorithms. © 1991-2012 IEEE.


Wang Z.,Zhejiang University | Wang Z.,Changzhou University | Mo H.,Zhejiang University | Cheng D.,Zhejiang University | And 2 more authors.
Organic and Biomolecular Chemistry | Year: 2012

Dehydrogenative cross-coupling reaction of primary anilines, secondary anilines, carboxamides, and sulfonamides with 1,3-diarylpropenes to form a series of allylic amines promoted by DDQ have been realized. Both monoallylation and diallylation products can be selectively synthesized when primary anilines are used as the starting materials. The method may provide a wide scope of allylamines in scientific research including biologically active compound library construction. This journal is © 2012 The Royal Society of Chemistry.


Li J.,Zhejiang University of Technology | He P.,Zhejiang University of Technology | Yu C.,Zhejiang University of Technology
Tetrahedron | Year: 2012

With diphenylammonium triflate (DPAT) as a catalyst, the highly substituted pyridines and dihydropyridines were prepared under solvent-free conditions from aldehydes, ketones, and amines via a one-pot multi-component reaction. The advantages of this protocol include excellent yields, environmentally benign source of nitrogen, mild reaction conditions, and simple manipulation. Different source of nitrogen like urea, thiourea, inorganic ammonium salts, and organic amines were studied. In addition, a novel way was developed for the conversion of primary aliphatic amines into alcohols. © 2012 Elsevier Ltd. All rights reserved.


Zhang G.,Zhejiang University of Technology | Han X.,Zhejiang University of Technology | Luan Y.,Zhejiang University of Technology | Wang Y.,Zhejiang University of Technology | And 2 more authors.
Chemical Communications | Year: 2013

A novel and highly practical copper-catalyzed aerobic alcohol oxidation system with l-proline as the ligand at room temperature has been developed. A wide range of primary and secondary benzylic alcohols tested have been smoothly transformed into corresponding aldehydes and ketones with high yields and selectivities. © 2013 The Royal Society of Chemistry.


Shen C.,Zhejiang University | Wen Y.,Zhejiang University | Shen Z.,Zhejiang University of Technology | Wu J.,Hangzhou Normal University | Liu W.,Zhejiang University
Journal of Hazardous Materials | Year: 2011

A facile and green approach that improves the catalytic lifetime of cobalt tetrasulfophthalocyanine (CoTSPc) for the degradation of dyes is presented. Structurally ordered mesoporous silicas (MCM-41, MCM-48 and SBA-15), microporous aluminosilicates (ZSM-5) and macroporous alumina (γ-Al 2O 3) with different pore sizes were selected for the immobilization of CoTSPc, and a wide range of pH conditions (pH values from 4 to 12) were tested with the CoTSPc immobilization procedure. In the catalytic oxidation study, CoTSPc that was immobilized to MCM-41 silica (CoTSPc@MCM-41) prepared at a pH of 12 showed the longest catalytic lifetime. The TOC removal and discoloration of C. I. Acid Red 73 was approximately 60% and 82%, respectively, in the presence of CoTSPc@MCM-41 with H 2O 2 after 3h. These results indicate that MCM-41, which has a matching size between its mesopores (30Å) and CoTSPc molecules (25Å), can prevent CoTSPc molecules from aggregating and improve its catalytic lifetime. In addition, the ability of CoTSPc@MCM-41 to degrade other dyes, and the reuse studies, demonstrated that CoTSPc@MCM-41 could be reused for the degradation of most common dyes. © 2011 Elsevier B.V.


Shen C.,Zhejiang University | Shen Y.,Zhejiang University of Technology | Wen Y.,Zhejiang University | Wang H.,Zhejiang University of Technology | Liu W.,Zhejiang University
Water Research | Year: 2011

The dyeing effluent of high alkalinity, which could not be treated efficiently by traditional wastewater technologies, highlighted the need to explore a technically feasible, highly efficient and cost effective method. Thus, a fast and highly efficient method for the removal of dyes under alkaline conditions using magnetic chitosan-Fe(III) hydrogel was proposed. Firstly, chitosan-Fe(III) hydrogel was prepared by a chelation procedure with cheap and environmentally friendly chitosan and iron salts. We characterized the sorption and desorption of C. I. Acid Red 73, a common type of anionic dye, on magnetic chitosan-Fe(III) hydrogel, to understand its availability for alkaline dyeing wastewater. Sorption of dye to chitosan-Fe(III) hydrogel was fast (adsorption could reach equilibrium in less than 10 min) in a wide pH range, and agreed well to the Langmuir-Freundlich adsorption model with a high maximum adsorption capacity of 294.5 mg/g under pH = 12. Meanwhile, 1 mol/L NaOH was used to desorb the dye efficiently (desorption efficiency 94.4%) and 0.1 mol/L HCl was applied to regenerate the chitosan-Fe(III) hydrogel. The results showed that the chitosan-Fe(III) hydrogel could retain its high efficiency after the desorption and regeneration. The common coexisting ions almost had no negative effect on the dye adsorption of chitosan-Fe(III) and the removals of a variety of anionic dyes suggest that the magnetic chitosan-Fe(III) hydrogel could efficiently adsorb both the acid and reactive dyes under alkaline condition. Overall, the results reported herein indicated that magnetic chtisoan-Fe(III) with high adsorption efficiency and strong magnetic property is very attractive and implies a potential of practical application for alkaline dyeing effluent treatment. © 2011 Elsevier Ltd.


Zhang G.,Zhejiang University of Technology | Qin L.,Zhejiang University of Technology | Wu Y.,Zhejiang University of Technology | Xu Z.,Zhejiang University of Technology | Guo X.,Dalian University of Technology
Nanoscale | Year: 2015

A novel SiO2 nanosphere was synthesized by the post-synthetic grafting of sulfonic acid groups on to anionic-surfactant-templated mesoporous NH2-silica (AMAS). This one-pot post-functionalization strategy allowed more metal ions to be homogeneously anchored into the channel of the meso-SiO2 nanosphere. After hydrothermal and calcination treatment, the in situ growth of α-Fe2O3 on sulfonic acid-functionalized mesoporous NH2-SiO2 (SA-AMAS) exhibited much higher activity in the visible-light assisted Fenton reaction at neutral pH than that for AMAS or meso-SiO2 nanospheres. By analysis, the grafted sulfonic acid group can not only enhance the acid strength of the catalyst, but can also bring more orbital-overlapping between the active sites (FeII and FeIII) and the surface peroxide species, to facilitate the decomposition of H2O2 to hydroxyl radical. The present results provide opportunities for developing heterogeneous catalysts with high-performance in the field of green chemistry and environmental remediation. © 2015 The Royal Society of Chemistry.


Tao X.,Zhejiang University of Technology | Chen F.,Zhejiang University of Technology | Xia Y.,Zhejiang University of Technology | Huang H.,Zhejiang University of Technology | And 3 more authors.
Chemical Communications | Year: 2013

Porous Pt nanostructure decorated sulfur microparticles (Pt@S) are fabricated using sulfur as the template. The Pt@S electrode shows a higher volumetric specific capacity of 520 mA h cm-3 and improved cyclability with only 15% capacity fading after 80 cycles at 0.1 C (167.5 mA g-1). © 2013 The Royal Society of Chemistry.


Hu B.,Zhejiang University of Technology | Hu B.,University of Nebraska - Lincoln | Dimagno S.G.,University of Nebraska - Lincoln
Organic and Biomolecular Chemistry | Year: 2015

Nitrogen heterocycles are abundant in natural products and pharmaceuticals. An emerging interest among synthetic chemists is to apply vinyl azides as a pivotal three-atom synthon for the construction of structurally complex and diverse N-heterocyclic skeletons. The unique features of the azide group connected to an alkene moiety permit vinyl azides to function as electrophiles, nucleophiles, or radical acceptors; their access to diverse reaction pathways provides great opportunities to generate highly reactive intermediates with often unusual or unconventional reactivities. This tutorial review will systematically illustrate the reactivities of vinyl azides and describe recent breakthroughs in the development of new transformations that create N-heterocycles. This journal is © The Royal Society of Chemistry 2015.


Zhang Z.,Zhejiang University of Technology | Wu H.,Zhejiang University of Technology | Ye G.,Zhejiang University of Technology | He X.,City University of Hong Kong | Chai G.,Zhejiang University of Technology
Composite Structures | Year: 2014

Anti-symmetric cylindrical shell as a novel bistable composite structure, offers wide applications in many fields. The entire snap-through and snap-back processes of the anti-symmetric cylindrical shell are systematically studied through experimental investigation and numerical simulation. The experimental and numerical results are also compared with the analytical predictions. The parameters used to characterize the bistable performances of the shells, including coiled-up radii, stress distributions of the shell in the second stable state, and snap load are measured. Load-displacement curves and buckling phenomena in the snapping process are successfully captured. The influences of the geometrical sizes and layup conditions on the bistable performance of anti-symmetric cylindrical shells are discussed in detail. Comprehensive experimental and numerical results indicate that the initial mid-plane transverse radius and ply angle are two key factors that affect bistable behaviors in the same environmental conditions, which is accordant with theoretical predictions, whereas the number of plies and longitudinal length of the shell only influence on the snap load and stress distribution. The angle of embrace is demonstrated of no influence on bistable performance of anti-symmetric cylindrical shells. © 2014 Elsevier Ltd.


Yuan W.-B.,Zhejiang University of Technology | Kim B.,University of Plymouth | Li L.-Y.,University of Plymouth
Journal of Constructional Steel Research | Year: 2014

The majority of the existing literature on castellated members is focused on beams. Very little work has been done on the stability of castellated columns although they have been increasingly used in buildings in recent years. This paper presents a new analytical solution for calculating the critical buckling load of simply supported castellated columns when they buckle about the major axis. This analytical solution takes into account the influence of web shear deformations on the buckling of castellated columns and is derived using the stationary principle of potential energy. The formula derived for calculating the critical buckling load is demonstrated for a wide range of section dimensions using the data obtained from finite element analyses published by others. It was found that the influence of web shear deformations on the critical buckling loads of castellated columns increased with the cross-sectional area of a tee section and the depth of web opening, but decreased with the length and the web thickness of the column. It is shown that the inclusion of web shear deformations significantly reduces the buckling resistance of castellated columns. Neglecting the web shear deformations could overestimate the critical buckling load by up to 25%, even if a reduced second moment of area is used. © 2013 Elsevier Ltd.


Liu X.-F.,Ningbo University of Technology | Liu X.-H.,Zhejiang University of Technology
Acta Crystallographica Section E: Structure Reports Online | Year: 2011

The title compound C7H5N3S2, occurs as the thione tautomer in the solid state; the dihedral angle between the pyridine and thiadiazole ring planes is 2.08 (6)°. In the crystal, molecules are linked by N - H⋯N hydrogen bonds, generating C(8) chains propagating in [010].


Zhang J.,Zhejiang University of Technology
Applied Mechanics and Materials | Year: 2014

China has become the largest manufacturer and exporter in the global clothing market with cost advantages. Given the intensification of global competition, it is crucial to assess the present status and international competitiveness of Chinese clothing industry. This paper makes a quantitative analysis on the international competitiveness of Chinese clothing industry by using trade competitiveness index and revealed comparative advantage index. Moreover, based on an in-depth analysis of the influencing factors, this paper puts forward some measures to enhance the international competitiveness of Chinese clothing industry. © (2014) Trans Tech Publications, Switzerland.


Ying G.-Q.,Zhejiang University of Technology | Xiong W.-Y.,Zhejiang University of Technology | Wang H.,Zhejiang University of Technology | Sun Y.,Zhejiang University of Technology | Liu H.-Z.,Zhejiang University of Technology
Carbohydrate Polymers | Year: 2011

Water-solubility at neutral or basic pH of chitosan was largely improved by specific attachment of carbohydrates to the 2-amino functions achieved by Maillard reaction or further reductive alkylation of Schiff bases. The characteristic physicochemical, rheological properties, and antioxidant activities of the derivatives were investigated. Experimental results indicated that the solubility of all the chitosan-saccharides before and after reducing had been greatly enhanced comparing to the native chitosan. The Schiff base typed chitosan-fructose derivative was highest at 13.2 g/L of all, and Schiff base typed chitosan derivatives existed better solubility, Ph stability and more effective scavenging activity against DPPH radical than N-alkylated chitosan derivatives. The degree of substitution (DS) of the chitosan derivatives increased with higher concentration of saccharide, increasing reaction time and temperature. The reduction of viscosity of chitosan derivatives decreased with increasing reaction time and temperature. The results suggest that the water-soluble chitosan derivatives produced through Maillard reaction may be promising commercial additive in cosmetics and food. © 2010 Elsevier Ltd. All rights reserved.


Du F.,Zhejiang University of Technology
Advanced Materials Research | Year: 2012

In this paper, a Faster algorithm: BMF is proposed, which sets improvements in the time complexity of the BM algorithm. The BMF algorithm defines a new pre-calculation function to increase in the skips of pattern significantly. Experiments indicate that the time complexity is reduced by 63% at most. Therefore, the improved algorithm could provide significant improvement in pattern matching performance when using in an IDS. © (2012) Trans Tech Publications, Switzerland.


Shen C.,Zhejiang University | Chen H.,Zhejiang University | Wu S.,Zhejiang University | Wen Y.,Zhejiang University | And 4 more authors.
Journal of Hazardous Materials | Year: 2013

Metal-biopolymer complexes has recently gained significant attention as an effective adsorbent used for the removal of Cr(VI) from water. Unfortunately, despite increasing research efforts in the field of removal efficiency, whether this kind of complex can reduce Cr(VI) to less-toxic Cr(III) and what are the mechanisms of detoxification processes are still unknown. In this study, despite the highly adsorption efficiency (maximum adsorption capacity of 173.1. mg/g in 10. min), the significant improvement of Cr(VI) reduction by chitosan-Fe(III) complex compared with normal crosslinked chitoan has been demonstrated. In addition, the structure of chitosan-Fe(III) complex and its functional groups concerned with Cr(VI) detoxification have been characterized by the powerful spectroscopic techniques X-ray absorption fine structure (XAFS) and X-ray photoelectron spectroscopy (XPS). The XPS spectra indicated that the primary alcoholic function on C-6 served as an electron donor during Cr(VI) reduction and was oxidized to a carbonyl group. The X-ray adsorption near edge spectra (XANES) of the Cr(VI)-treated chitosan-Fe(III) complex revealed the similar geometrical arrangement of Cr species as that in Cr(III)-bound chitosan-Fe(III). Overall, a possible process and mechanism for highly efficient detoxification of Cr(VI) by chitosan-Fe(III) complex has been elucidate. © 2012 Elsevier B.V.


Wen X.,Zhejiang University of Technology
Synlett | Year: 2012

(A) Instead of the traditional palladium-catalyzed Wacker oxidation, Itoh and co-workers3 have reported an one-pot synthetic protocol of acetophenones from styrenes with molecular iodine, visible light and oxygen. Regardless of various substituents at the aromatic ring, the corresponding acetophenones could be obtained in moderate to good yields. This procedure involves aerobic photooxidation and deiodination in one pot and provides the first report of metal-free direct syntheses of acetophenones from styrenes. (B) By employing catalytic amount (10 mol%) of I 2 and [hydroxy( tosyloxy)iodo]benzene (HTIB, Koser's reagent), Giannis et al.4 have described a new and efficient synthetic method for diverse tetrahydrofuran derivatives. Compared to the previous systems such as Pd(II)/DIB5 or NaIO4/NaHSO3,6 the present methodology exhibits obvious advantages; it is a one-step, metal-free and simple operation and has also great applicability in the synthesis of biologically active natural products. (C) Iodine-induced regioselective C-C and C-N bond forming reactions of N-protected indole derivatives were reported by Liang and co-workers.7 Compared with the transition-metal-catalyzed crosscouplings requiring noble metal catalysts and high loading of metal oxidants, the novel coupling method has shown great potential for both industrial and academic purposes. (D) Nicholas and co-workers8 have disclosed an I 2-catalyzed aminosulfonating system for a broad range of benzylic and some types of saturated hydrocarbons utilizing imido-iodinanes (PhI = NSO2Ar) as aminosulfonating reagent. It was worth to mention that the reaction was highly regioselective for the tertiary C-H of adamantine with no secondary C-H aminated product detected. While in some previous reported transition-metal-catalyzed systems,9 the regioselectivity was relatively poor and the ratio of tertiary to secondary aminated products was 3-15:1. (E) Mao et al.10 have found that the transition-metal-catalyzed Suzuki coupling could also be well performed in air using iodine as effective catalyst. In addition, the newly developed metal-free protocol was also applicable for the coupling of (E)-β-bromostyene with phenylboronic acid, with retention of the double bond geometry. (F) Benzimidazole is an important chemical entity in pharmaceuticals due to its structural similarity to purine. In order to obtain this useful reagent, Lin et al.11 have developed an efficient method for the conversion of unprotected and unmodified aldoses into aldobenzimidazoles and aldo-naphthimidazoles using iodine as oxidant. A series of mono-, di-, and trialdoses containing carboxyl and acetamido groups were introduced into the reaction given the desired products in high yields. Notably, no cleavage of the glycosidic bond occurred under such mild reaction conditions. (G) Molecular iodine can also be used for deprotection. Konwar and co-workers12 found that the I 2/SDS/water system could transform a broad range of oximes and imines to the corresponding carbonyl compounds with moderate to good yields under neutral conditions. it was found that the catalytic amount of I 2 could promote the reaction in the presence of surfactant (SDS), meanwhile, no formation of iodoxime/imidoyl iodide or over-oxidized products (acids) were observed during the reaction. © Georg Thieme Verlag Stuttgart. New York.


Sun Y.,Zhejiang University of Technology
Lecture Notes in Electrical Engineering | Year: 2013

The effective implementation of human centered management needs an essential understanding to the ethnological characters of human resource. A study is carried out on Chinese ethnological characters and the difference to western from the view point of order pattern. A global pattern and a local pattern are used to describe them respectively. The two patterns work together in management, which cause conflicts between Chinese ethnological character and the western-originated modern management system, and result in low efficiency and stability of corporations. The paper gives a study on human resource management based on this difference and describes clearly the problems caused by ethnological characters. A net structure and the knot response mechanism are used to express the exterior behavior of Chinese ethnological characters. Some inspiring suggestions are given based on connectionism theories. © 2013 Springer Science+Business Media.


Huang W.,Zhejiang University of Technology | Chen S.,Zhejiang University of Technology
Journal of Statistical Mechanics: Theory and Experiment | Year: 2011

In this paper, we propose a model incorporating both the traffic routing dynamics and the virus prevalence dynamics. In this model, each packet may be isolated from the network on its transporting path, which means that the packet cannot be successfully delivered to its destination. In contrast, a successful transport means that a packet can be delivered from source to destination without being isolated. The effects of model parameters on the delivery success rate and the delivery failure rate are intensively studied and analyzed. Several routing strategies are performed for our model. Results show that the shortest path routing strategy is the most effective for enhancing the delivery success rate, especially when each packet is only allowed to be delivered to the neighbor with the lowest degree along the shortest path. We also find that, by minimizing the sum of the nodes' degree along the transporting path, we can also obtain a satisfactory delivery success rate. © 2011 IOP Publishing Ltd and SISSA.


Chen L.,Zhejiang University of Technology | Shen H.,Zhejiang University of Technology | Wei C.,Zhejiang University of Technology | Zhu Q.,Zhejiang University of Technology
Applied Microbiology and Biotechnology | Year: 2013

A newly isolated Aspergillus niger strain containing epoxide hydrolase was used to resolve racemic glycidyl azide and four derivatives to the (R)-enantiomers. After optimization of the biotransformation conditions, (R)-glycidyl azide was produced with good enantioselectivity (e.e.s > 95 %, E > 20). The substrate structure, pH, and reaction time were found to have profound influences on the catalytic property of A. niger ZJUTZQ208. Enantiopure glycidyl azide was further utilized to synthesize linezolid in good yield, indicating it is a new and concise synthon for chiral vicinal amino alcohols. Enzyme-substrate docking studies were carried out with glycidyl azide to study the selectivity of this strain. © 2012 Springer-Verlag.


You Z.-Y.,Zhejiang University of Technology | Liu Z.-Q.,Zhejiang University of Technology | Zheng Y.-G.,Zhejiang University of Technology | Shen Y.-C.,Zhejiang University of Technology
Journal of Industrial Microbiology and Biotechnology | Year: 2013

A codon-optimized 2-deoxyribose-5-phosphate aldolase (DERA) gene was newly synthesized and expressed in Escherichia coli to investigate its biochemical properties and applications in synthesis of statin intermediates. The expressed DERA was purified and characterized using 2-deoxyribose-5-phosphate as the substrate. The specific activity of recombinant DERA was 1.8 U/mg. The optimum pH and temperature for DERA activity were pH 7.0 and 35 C, respectively. The recombinant DERA was stable at pH 4.0-7.0 and at temperatures below 50 C. The enzyme activity was inhibited by 1 mM of Ni2+, Ba2+ and Fe2+. The apparent K m and V max values of purified enzyme for 2-deoxyribose-5-phosphate were 0.038 mM and 2.9 μmol min-1 mg-1, for 2-deoxyribose were 0.033 mM and 2.59 μmol min-1 mg-1, respectively, which revealed that the enzyme had similar catalytic efficiency towards phosphorylated and non-phosphorylated substrates. To synthesize statin intermediates, the bioconversion process for production of (3R, 5S)-6-chloro-2,4,6-trideoxyhexose from chloroacetaldehyde and acetaldehyde by the recombinant DERA was developed and a conversion of 94.4 % was achieved. This recombinant DERA could be a potential candidate for application in production of (3R, 5S)-6-chloro-2,4,6- trideoxyhexose. © 2012 Society for Industrial Microbiology and Biotechnology.


Bai S.,Zhejiang University of Technology | Peng X.,Zhejiang University of Technology | Li Y.,Zhejiang University of Technology | Sheng S.,Zhejiang University of Technology
Tribology Letters | Year: 2010

A new type of hydrodynamic laser surface texturing gas seal with orientation ellipse dimples is introduced to improve hydrodynamic effect. Theoretical model is developed to study the hydrodynamic effect of this new gas seal. Then, a parametric investigation of the texturing parameters such as slender ratio, dimple inclination angle, dimple depth, and dimple area rate is presented for the presented gas seal under different operating parameters of rotation speed, seal pressure, and clearance. Results show that the orientation dimples can greatly improve hydrodynamic effect of laser surface texturing gas seals. Open force may be improved more than 20% greater by hydrodynamic effect in the analysis. © 2010 Springer Science+Business Media, LLC.


Niu L.,Zhejiang University | Yang F.,Zhejiang University | Xu C.,Zhejiang University of Technology | Yang H.,Hangzhou Normal University | Liu W.,Zhejiang University
Environmental Pollution | Year: 2013

Increasing metal pollution has drawn broad public attention in China due to severe environmental quality deterioration. However, so far, there has been no study to survey metal accumulation in Chinese farmland soil at the national scale. In this study, we determined 11 metals in farmland soils across the Mainland China. Our results indicated the concentrations of Pb, Cd, Zn, and Cu (10.1-184.2, 0.082-1.31, 20.2-321.9, 8.2-515.9 mg/kg, respectively) were elevated above their reference values. Moreover, these metals followed a similar geochemical distribution pattern. The accumulation of Pb, Cd, Zn, and Cu in soils may be associated with human activities for soil fertility. Cadmium had the highest pollution index (PI) of 5.28, and the average hazard quotients (HQs) for all the metals were below 1. Hence, except for Cd, the metals in Chinese arable soils are comparatively safe. Results from this study may provide valuable information for agricultural soil management in China. © 2013 Elsevier Ltd. All rights reserved.


Zhou J.,Zhejiang University of Technology | Jin C.,Zhejiang University of Technology | Su W.,Zhejiang University of Technology
Organic Process Research and Development | Year: 2014

A novel process for the preparation of fluticasone propionate (1), a corticosteroid, is reported. In this paper, compound 2 was used as starting material to prepare 6 by using NaClO or NaBrO which was much cheaper than H 5IO6 as an oxidizing agent. Furthermore, toxic, expensive, and pollutive BrCH2F was replaced by AgNO3 and Selectfluor in decarboxylative fluorination. © 2014 American Chemical Society.


Yu C.,Zhejiang University of Technology | Zhang C.,Zhejiang University of Technology | Shi X.,Zhejiang University of Technology
European Journal of Organic Chemistry | Year: 2012

A Cu-catalyzed cross-coupling reaction of diaryl disulfides or aryl thiols with pentafluorobenzene using CuBr as the catalyst, tBuOLi or tBuOK as the base in DMSO at 60 °C under an O 2 atmosphere was investigated. The corresponding bisarylthiolation products were obtained in moderate to good yields by C-H bond and C-F bond activation. When 1,10- phenanthroline·H 2O and DDQ were added to the above system, monoarylthiolation products, with/without bisarylthiolation products, could be isolated in moderate yields. A plausible mechanism for these transformations was given. Thus, it represents a method for the synthesis of polyfluorinated diaryl sulfides and polyfluorinated triarylbisulfides throughC-H bond and C-F bond activation. The Cu-catalyzed cross-coupling of diaryl disulfides/thiols with pentafluorobenzene in the presence of CuBr and tBuOLi or tBuOK in DMSO at 60 °C under an O 2 atmosphere was investigated. The corresponding bisarylthiolation products wereobtained by C-H bond and C-F bond activation. When 1,10-phenanthroline·H 2O and DDQ were added to the above system, monoarylthiolation products could be isolated. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Zhang G.,Zhejiang University of Technology | Zhao X.,Zhejiang University of Technology | Yan Y.,Zhejiang University of Technology | Ding C.,Zhejiang University of Technology
European Journal of Organic Chemistry | Year: 2012

A phosphane-free method for the direct arylation of benzothiazole by employing oxime-derived palladacycle 1 as a catalyst was developed. The new catalyst system can be used for 2-arylations by using aryl bromides and iodides. In addition, this method is especially suitable for the intramolecular direct coupling of bromo-and iodoamides, as well aschloroamides, to achieve a rapid synthesis of benzo[c]phenanthridine alkaloids. Direct arylation reactions under catalysis of an oxime-derived palladacycle were investigated. This phosphane-free method is applicable for the 2-arylation of benzothiazole and is especially suitable for the intramolecular direct coupling of bromo-and iodoamides, as well as chloroamides, to achieve rapid synthesis of benzo[c]phenanthridine alkaloids. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Zhou C.-H.,Zhejiang University of Technology | Shen Z.-F.,Zhejiang University of Technology | Shen Z.-F.,Curtin University Australia | Liu L.-H.,Curtin University Australia | Liu S.-M.,Curtin University Australia
Journal of Materials Chemistry | Year: 2011

This article provides an insight into state-of-the-art advances in the preparation and functionalization of clay-containing thin films. Layered clay minerals and their synthetic counterparts such as cationic montmorillonite, saponite, laponite and anionic layered double hydroxides are often used as main components or functional fillers in the hybrid films. Strategic assembly of clay minerals or layered double hydroxides with functional molecules has led to a variety of nanostructured clay-containing hybrid films. Frequently used approaches are the solvent casting, the spin-coating, the layer-by-layer (LbL) assembly and the Langmuir-Blodgett (LB) techniques. The type of clay mineral, solvent, pH, organic components and functional molecules generally play a pivotal role in the formation and structure of a desired functional film. Different processes result in differences in the thickness, surface morphology and internal structure in the resultant clay-containing films. Functional polymers, dye molecules, transition metal complexes and protein molecules and even their combination have been exploited to fabricate and functionalize clay-containing films. Many studies have suggested that the functional clay-containing films have potential applications in many areas such as catalysis, modified electrodes and optoelectronic devices, anti-corrosion and packaging materials. Finally, the prospects for the future preparation and applications of clay-containing films are discussed. © 2011 The Royal Society of Chemistry.


Xue Y.-L.,Jiangsu University | Liu X.-H.,Zhejiang University of Technology | Zhang Y.-G.,Shandong Academy of Sciences
Asian Journal of Chemistry | Year: 2012

A cyclopropane derivative, 1-cyano-N-phenylcyclopropanecarboxamide (C 11H 10N 2O) was synthesized and its structure was studied by X-ray diffraction, FTIR, 1H NMR spectrum and MS. The crystals are monoclinic, space group Pbca with a = 10.0466(19), b = 9.6067(17), c = 20.790(3) Å, α = 90.00, b = 90.00, g = 90.00°, V = 2006.5(6) Å 3, Z = 8, F(000) = 784.00, Dc = 1.233 g/cm 3, μ = 0.815 cm -1, the final R = 0.0567 and wR = 0.1456. A total of 8716 reflections were collected, of which 1967 were independent (R int = 0.045). Theoretical calculation of the title compound was carried out with B3LYP/6-31G (d.p.). The full geometry optimization was carried out using 6-31G(d.p.) basis set and the frontier orbital energy. The structure-activity relationship was also studied. The preliminary biological test showed that the synthesized compound is bioactive against the ketol-acid reductoisomerase of Escherichia coli.


Xue Y.-L.,Jiangsu University | Zhang Y.-G.,Shandong Academy of Sciences | Liu X.-H.,Zhejiang University of Technology
Asian Journal of Chemistry | Year: 2012

A cyclopropane derivative, 1-cyano-N-(2,4-dichlorophenyl) cyclopropanecarboxamide (C11H8N2OCl2) was synthesized and its structure was studied by X-ray diffraction, FTIR, 1H NMR, MS and elemental analysis. The crystals are monoclinic, space group C2 with a = 14.387(9), b = 6.926(4), c = 12.237(7) A°, a = 90.00, b = 100.386(10), g = 90.00°, V = 1199.4(12) A°3, Z = 4, F(000) = 520, Dc = 1.413 g/cm3, μ = 0.520 cm-1, the final R = 0.0603 and wR = 0.1653. A total of 2976 reflections were collected, of which 1134 were independent (Rint = 0.0381). The preliminary biological test showed that the synthesized compound is bioactive against the KARI of Escherichia coli.


Gu S.,Zhejiang University of Technology | Chai G.,Zhejiang University of Technology | Wu H.,Zhejiang University of Technology | Bao Y.,Zhejiang University of Technology
Materials and Design | Year: 2012

The H13-TiC composite coatings were synthesized by the laser cladding and the mechanical properties of particle and matrix phases at the microscopic scales were measured by the non-destructive testing (nanoindentation). The influence of indentation depth on the individual constituent properties of composite coating was investigated and the particle morphology effect on the particle modulus and hardness was studied by a simple model. The TiC particle crack induced by nanoindentation was observed and the critical fracture stress of TiC particle was obtained by the combination of experiment and finite element analysis. The indentation process was modeled by the perfect elastic-plastic behavior of particle and elastic-plastic hardening of matrix, while a critical maximum tensile stress criterion for particle fracture initiation was adopted. The Young's modulus and hardness of TiC particle were obtained to be 456 ± 36. GPa and 38.2 ± 3.7. GPa, respectively, while those of matrix were 255 ± 35. GPa and 9 ± 2. GPa, respectively. The comparison between the simulations and experimental results gives an estimation of the critical maximum tensile stress of 5.2 ± 0.7. GPa. © 2012 Elsevier Ltd.


Zheng J.-J.,Zhejiang University of Technology | Zhang J.,Princeton University | Scherer G.W.,Princeton University
Cement and Concrete Research | Year: 2012

This paper presents a computer simulation method for predicting the degree of hydration at the initial setting time of cement paste with particle agglomeration. Agglomeration is controlled by using a square-well potential for the interaction between two cement particles, and the degree of hydration at the initial setting time is determined using the burning algorithm. It is verified that, when the critical surface-to-surface distance for attachment is taken as 0.05 μm, the simulation predictions are in good agreement with experimental results. For cement particles in water at the initial stage of hydration, the number of clusters obeys the power law with an average Fisher exponent of 1.9. Finally, the effects of key factors affecting the degree of hydration at the initial setting time are quantitatively evaluated. © 2012 Elsevier Ltd. All rights reserved.


Xu L.,Zhejiang University of Technology | Xu L.,Shenyang University of Chemical Technology | Yang F.,Zhejiang University of Technology | Su C.,Zhejiang University of Technology | And 2 more authors.
Electrochimica Acta | Year: 2014

Two 2,2,6,6-tetramethylpiperidinyl-N-oxy (TEMPO) contained polypyrrole (PPy) derivatives with the different side-chain length were synthesized by esterification of 4-hydroxy-2,2,6,6-tetramethylpiperidine-1-oxyl free radial with pyrrole butyric acid and pyrrole caproic acid. Then the homopolymers of 4-(3-(Pyrrol-1-yl)butyryloxy)-2,2,6,6-tetramethylpiperidin-1-yloxy (PPy-B-TEMPO) and 4-(3-(Pyrrol-1-yl)hexanoyloxy)-2,2,6,6-tetramethylpiperidin-1-yloxy (PPy-C-TEMPO) were prepared by chemical oxidative polymerization. The structure, morphology, electrochemical properties of prepared polymers were characterized by fourier transform infrared spectroscopy (FTIR), ultraviolet visible spectroscopy (UV-vis), scanning electron microscopy (SEM), cyclic voltammograms (CV) and electrochemical impedance spectra (EIS), respectively. Also, the charge-discharge properties of the prepared polymers were studied by galvanostatic charge-discharge testing. The results demonstrated that the as-synthesized nitroxide radical polymers showed a reversible two-electron redox reaction process in the potential limits of 2.5-3.0 V and 3.4-3.8 V vs Li/Li+, respectively. Under our experimental conditions, PPy only presented the discharge capacity of 16.5 mAh·g-1 at 20 mA·g-1 between 2.5 and 4.2 V, while PPy-B-TEMPO with the short side-chain linked to TEMPO groups exhibited an initial discharge capacity of up to 86.5 mAh·g-1 with two well-dened plateaus. Furthermore, the PPy-C-TEMPO with the longer linking side-chain even displayed a discharge capacity of 115 mAh·g-1. These superior electrochemical performances were ascribed to the flexible linking side-chain and the introduction of stable conductive PPy main chain, which benefits the improvement of charge carrier transportation in the aggregated polymer bulk. © 2014 Elsevier Ltd.


Qi J.,Zhejiang University of Technology | Zhang Y.,Zhejiang University of Technology | Chen Y.,Zhejiang University of Technology
Renewable Energy | Year: 2014

Influenced by partial shade, PV module aging or fault, there are multiple peaks on PV array's output power-voltage (P - V) characteristic curve. Conventional maximum power point tracking (MPPT) methods are effective for single peak P - V characteristic under uniform solar irradiation, but they may fail in global MPP tracking under multi-peak P - V characteristics. Existing methods in literature for this problem are still unsatisfactory in terms of effectiveness, complexity and speed. In this paper, we first analyze the mathematical model of PV array that is suitable for simulation of complex partial shade situation. Then an adaptive MPPT (AMPPT) method is proposed, which can find real global maximum power point (MPP) for different partial shade conditions. When output characteristic of PV array varies, AMPPT will adjust tracking strategies to search for global peak area (GPA). Then it is easy for conventional MPPT to track the global MPP in GPA. Simulation and experimental results verify that the proposed AMPPT method is able to find real global MPP accurately, quickly and smoothly for complex multi-peak P - V characteristics. Comparison analysis results demonstrate that AMPPT is more effective for most shade types. © 2013 Elsevier Ltd.


Li J.,Zhejiang University of Technology | Chen Y.,Nanjing University of Science and Technology
Optics and Laser Technology | Year: 2012

Based on the theory of paraxial electromagnetic beams in anisotropic medium, propagation properties of a linearly polarized confluent hypergeometric (HyG) beam through uniaxial crystals orthogonal to the optical axis are investigated. Analytical expressions are derived for the resultant optical field components. Effects of separate beam parameters together with the ratio of refractive indices of crystals on transversal intensity distributions are revealed by numerical calculations, respectively. It is shown that the beam profile finally converts into an elliptical shape due to influences of anisotropic crystals. Moreover, it is also indicated that through suitable selection of parameters, types of the optical vortices of resultant field would change from a central dark spot to a slight dark ring or an axial shadow during the propagation. These numerical results may provide alternative advantages to the trapping of tiny particles by utilizing HyG beams in practical experiments. © 2011 Elsevier Ltd. All rights reserved.


Tao S.,Zhejiang University of Technology | Yumei Y.,Shanghai Research Institute of Building Sciences
Advances in Cement Research | Year: 2015

This paper reports on the characterisation and quantitative analysis of ettringite in the hydration products of several high-alite cements. The study has three main parts: (a) the investigation of the microscopic morphology of ettringite; (b) an X-ray diffraction characterisation; and (c) a quantitative analysis of the ettringite in the hardened cement pastes. The results show that the ettringite could be selectively extracted by an ethylene glycol/methanol solvent with a volume ratio of 1:3, which thereby proved to be an effective method for the quantitative analysis of ettringite. Combined with the results of the X-ray diffraction analysis, the formation and transformation mechanisms of ettringite could be characterised and described in more detail. During the 90-d aging period, the reaction degree of the coal gangue was higher than that of fly ash and had a greater impact on the formation and transformation of ettringite. The amount of ettringite formed from the hydration of coal gangue cement was higher than that from neat Portland cement, whereas the amount of ettringite formed from the hydration of fly ash cement was lower than that from neat Portland cement.


Hu Q.,Zhejiang University of Technology
Mathematical Problems in Engineering | Year: 2013

An ultradeep foundation pit is a complex system composed of a retaining structure, foundation soil, and groundwater. Design and construction of foundation pits for use at greater depths than in the past require continual improvement in the design methods and analysis methods applied. In this paper, a load-deformation analysis model of a retaining structure based on a bearing-mode analysis of an ultra-deep foundation pit is proposed. A calculation method was theoretically derived for the horizontal foundation stiffness coefficient for this model, and the influences of factors such as space size, stress path, load level, and seepage were analyzed. A numerical example and a case study of an ultra-deep foundation pit in the Hangzhou Metro Line number 1 test section are presented. The calculated results for deformation of the structure and for earth pressure were found to be similar to the results obtained from elastic-plastic finite element analysis and similar to the measured results. The results of this study indicate that the proposed analysis model adequately reflects the force-deformation characteristics of an ultra-deep foundation pit and show that the proposed analysis model appropriately considers the influences of various factors. © 2013 Qi Hu.


Chen J.-M.,Zhejiang University of Technology | Zhou Y.-Y.,Zhejiang University of Technology | Chen D.-Z.,Zhejiang University of Technology | Jin X.-J.,Zhejiang University of Technology
Bioresource Technology | Year: 2010

A Gram-negative strain DT4, capable of growing aerobically on tetrahydrofuran (THF) as the sole carbon and energy source was isolated from a pharmaceutical wastewater treatment plant. It was identified as Pseudomonas oleovorans by morphological and physiological characteristics as well as Biolog profiling and 16S rDNA sequence. Cells of P. oleovorans DT4 pre-cultured in THF could degrade 5 mM THF completely without lag phase. The generation time of 2.7 h and the maximum degradation rate of 203.9 mg THF/(h g dry weight) were observed, demonstrating that DT4 bears the highest THF-degrading activity in ever described strains. Furthermore, THF concentration as high as 100 mM was tolerated by the culture. Several important compounds including γ-butyrrolactone and benzene could be directly metabolized, whereas other pollutants (e.g., tetrahydropyrane) could be cometabolized by DT4. THF removal was achieved in a continuous flow system with the maximum specific growth rate 0.113 h -1 and half-saturation constant 1.224 mg/L, indicating the great potential of THF bioremediation in future full-scale application. © 2010 Elsevier Ltd. All rights reserved.


Wu X.,Zhejiang University of Technology | He X.,Zhejiang University of Technology | Sun N.,Nankai University | Fang Y.,Nankai University
Proceedings of the American Control Conference | Year: 2014

In this paper, a novel anti-swing controller is proposed for 3-dimensional (3-D) overhead cranes, which ensures fast transportation and efficient swing suppression during the regulation control process. Specifically, to increase the performance of the payload swing suppression, a swing-suppressing element is introduced, based on which a novel error signal is constructed. Then, a new control method is developed according to partial feedback linearization, and the overall system is divided into two subsystems including a defined error subsystem and a swing-suppressing subsystem. The stability analysis of the two subsystems and the overall system is given. Besides, the convergence of the system states is also proved. Simulation results are provided to demonstrate the effectiveness and superior performance of the proposed approach over the energy-based method. © 2014 American Automatic Control Council.


Yu Z.,Zhejiang University of Technology | Lv Y.,Zhejiang University of Technology | Lv Y.,Quzhou University | Yu C.,Zhejiang University of Technology
Organic Process Research and Development | Year: 2012

An expeditious and multikilogram-scale process for the Balz-Schiemann synthesis of o-difluorobenzene from ofluoroaniline via two separate continuous flow reactors in 90.0% yield has been set up. The main steps involved the generation of stable diazonium fluoborate intermediate in situ via continuous diazotization reactor at 20 °C, and the choice of odifluorobenzene as cosolvent to achieve the continuous flow fluorodediazoniation system. Reaction time of both steps could be brought down to within 10 s and 2 min, respectively, by increasing the reaction temperature and thereby taking advantage of improved mass and heat American Chemical Society. © 2012 American Chemical Society.


Zhu X.,Zhejiang University of Technology | Liu J.,Zhejiang University of Technology | Chen T.,Zhejiang University of Technology | Su W.,Zhejiang University of Technology
Applied Organometallic Chemistry | Year: 2012

An efficient mechanically activated solvent-free synthesis of (E)-stilbene derivatives by high-speed ball milling is described. This method has notable advantages in terms of good yield, short reaction time and high selectivity. Copyright © 2012 John Wiley & Sons, Ltd.


Cao H.,Zhejiang University of Technology | Wang Z.,Zhejiang University of Technology | Hou G.,Zhejiang University of Technology | Zheng G.,Zhejiang University of Technology
Surface and Coatings Technology | Year: 2010

Amorphous Ni-B/TiO2 electrodes were successfully prepared by electroless plating. Highly ordered TiO2 nanotube arrays fabricated by anodic oxidation were employed as substrate and loaded with Ni-B alloy by electroless plating. The phase formation, microstructures and catalytic activity of electrodes were investigated by field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD) and electrochemistry analyzer, respectively. The results show that Ni-B/TiO2 electrodes with an average particle size of 200nm present a typical amorphous structure of Ni and B, and have high catalytic activity for methanol electrooxidation in alkaline medium. The peak current density in cyclic voltammetry (CV) curves reaches 360 mAcm-2 in the solution with 0.5 molL-1 methanol, much higher than that of Ni-B/Ti electrode. With the methanol concentration increasing to 1.5 molL-1, the peak current density increases to 488 mAcm-2, after which it remains almost constant. The Ni-B/TiO2 electrodes are relatively stable according to catalytic lifetime test; the peak current density remains 72.1% of the original value after 1300 times cycles. The amorphous Ni-B/TiO2 electrode should be a promising candidate for direct methanol fuel cell. © 2010 Elsevier B.V.


Zhang A.,Zhejiang University of Technology | Li X.,Zhejiang University of Technology | Xing C.,Zhejiang University of Technology | Yang J.,Zhejiang University of Technology | Sun P.,Zhejiang University of Technology
International Journal of Biological Macromolecules | Year: 2014

Ultrasonic technology was applied for polysaccharide extraction from the fruiting bodies of P. Eryngii, and response surface methodology (RSM) was used to optimize the effects of processing parameters on polysaccharide extraction yield. Three independent variables were extraction time (A), ultrasonic power (B) and the ratio of solvent to sample (C), respectively. Results showed that the maximum yield of P. eryngii polysaccharide (PEPS) was obtained at an optimum condition: extraction time 39. min, ultrasonic power 517. W, the ratio of water to material 19. mL/g, and the PEPS extracting yield reached 34.3% under the conditions. PEPS were precipitated into three crude polysaccharides, PEPS30, PEPS60 and PEPS80, by different concentrations of ethanol respectively. The antioxidant activities of these three polysaccharides were evaluated. The results showed that PEPS80 had the best reducing power, DPPH radical scavenging ability and oxygen radical scavenging ability followed by PEPS60 and PEPS30. © 2014 Elsevier B.V.


Dong H.-P.,Zhejiang University of Technology | Wang Y.-J.,Zhejiang University of Technology | Zheng Y.-G.,Zhejiang University of Technology
Journal of Molecular Catalysis B: Enzymatic | Year: 2010

Optically pure ethyl (S)-3-hydroxyglutarate [(S)-3-EHG] is used as a key precursor for synthesis of a variety of pharmaceutically important compounds. In this work, we established an efficient procedure for enantioselectively hydrolyzing diethyl 3-hydroxyglutarate (3-DHG) to optically active (S)-3-EHG employing immobilized Candida antarctica lipase B (Novozym 435). Under the optimized conditions: pH 7.0, agitation speed 200 rpm, temperature 40 °C, 3-DHG concentration 0.15 mol L-1, and enzyme loading 7 g L -1, (S)-3-EHG was prepared in above 95% ee value and 98.5% yield, and the reaction was free from external mass transfer and intra-particle diffusion limitations and kinetically controlled. The inhibitions of substrate (3-DHG) and product (3-EHG) were excluded because both displayed no decline in activity at elevated concentrations within the given ranges. In addition, ethanol, a byproduct of the reaction, inhibited lipase B following an uncompetitive inhibition pattern. The kinetic constants were obtained through non-linear regression, with values of Vmax 1.29 mmol min-1 g -1, Km 0.06 mol L-1, and Ki 0.37 mol L-1, respectively. © 2010 Elsevier B.V. All rights reserved.


Chen L.,Zhejiang University of Technology | Wu F.,Intertek
Journal of Saudi Chemical Society | Year: 2014

Fluorinated acrylate latex was successfully prepared by semi-continuous seeded emulsion polymerization of dodecafluoroheptyl methacrylate (DFMA) with butyl acrylate (BA), methyl methacrylate (MMA) initiated by potassium persulfate in the water. The resultant latexes and their films are characterized with Fourier transform infrared (FTIR) spectrometry, contact angle determinator, dynamic light scattering detector and surface tension determinator. Effect of different surfactants on colloidal and polymer properties of fluorinated acrylate latex was studied. Results show that the latex prepared with sodium dodecyl benzene sulfonate surfactant has the smallest particle size and contact angle but the moderate surface tension. The latex prepared with perfluorooctanesulfonic acid potassium surfactant has the smallest surface tension, moderate particle size but the biggest contact angle. The latex prepared with sodium 2-hydroxy-3-(methacryloyloxy) prop- ane-1-sulfonate surfactant has the biggest particle size and surface tension but moderate contact angle. In addition, the latex prepared with sodium 2-hydroxy-3-(methacryloyloxy) prop- ane-1-sulfonate has higher electrolyte stability. © 2011.


Liu Z.-Q.,Zhejiang University of Technology | Zheng X.-B.,Zhejiang University of Technology | Zhang S.-P.,Zhejiang University of Technology | Zheng Y.-G.,Zhejiang University of Technology
Microbiological Research | Year: 2012

Lipase is one of the most important industrial enzymes, which has been widely used in the preparation of food additives, cosmetics and pharmaceuticals industries. In order to obtain a large amount of lipase, the lipase gene from Candida antarctica ZJB09193 was cloned, and expressed in Pichia pastoris with the vector pPICZαA. Under the optimal conditions, the yield of recombinant lipase in the culture broth reached 3.0g/L. After purification, the properties of recombinant lipase were studied: the optimum pH and temperature were pH 8.0 and 52°C, Ca 2+ activated the activity of lipase, and the apparent K m and V max values for p-nitrophenyl acetate were 0.34mM and 7.36μmolmin -1mg -1, respectively. Furthermore, the recombinant lipase was immobilized on pretreated textile for biosynthesis of vitamin A esters. In a system of n-hexane, 0.3g immobilized recombinant lipase was used in the presence of 0.06g vitamin A acetate and 0.55mmol fatty acid (nine different fatty acids were tested). The yield of all vitamin A esters exceeded 78% in 7h at 30°C except using lactic acid and hexanoic acid as substrates. After optimization, the yield of vitamin A palmitate reached 87%. This study has the potential to be developed into industrial application. © 2012 Elsevier GmbH.


Xue Y.-L.,Jiangsu University | Zhang Y.-G.,Shandong Academy of Sciences | Liu X.-H.,Zhejiang University of Technology
Asian Journal of Chemistry | Year: 2012

A cyclopropane derivative, 1-cyano-N-(4-bromophenyl)cyclopropanecarboxamide (C11H9N2OBr) was synthesized and its structure was studied by X-ray diffraction, FTIR, 1H NMR spectrum and MS. The crystal is triclinic, space group P-1 with α = 8.902(4), β = 10.944(5), c = 12.733(6) Å, α = 103.753(8), β = 106.812(9), γ = 104.004(9)°, V = 1087.1(9) Å3, Z = 4, F(000) = 528, Dc = 1.620 g/cm 3, the final R = 0.0604 and wR = 0.1197. A total of 5404 reflections were collected of which 3790 were independent (Rint = 0.0578). There are two intramolecular hydrogen bonds in the crystal lattice. The preliminary biological test showed that the synthesized compound had weak activity against the KARI of Escherichia coli.


Wang Y.-F.,Zhejiang University of Technology | Wang K.,Zhejiang University of Technology | Zhang W.,Zhejiang University of Technology | Zhang B.-B.,Zhejiang University of Technology | And 2 more authors.
European Journal of Organic Chemistry | Year: 2012

An efficient, organocatalytic enantioselective addition of cyclic diketones with β,γ-unsaturated α-keto esters has been developed that affords products in high yields (up to 95%) and excellent enantioselectivity (up to >99ee) under mild conditions with a low catalyst loading (2.5 mol-%). The unsaturated α-keto esters are effectively coordinated and activated through hydrogen bonds with the squaramides and proved to be excellent hydrogen-bond acceptors in this asymmetric organocatalytic reaction. This reaction provides valuable and easy access to chiral Michael adducts, which are important moieties in the skeletons of biological and pharmaceutical molecules. The Michael addition of cyclic diketones to β,γ-unsaturated α-keto esters catalyzed by bifunctional squaramide-derived chiral catalysts to afford adducts in high yields (up to 95%) and excellent enantioselectivities (up to 99%ee) under mild conditions is reported. The reaction affords chiral Michael adducts, which are important moieties in the skeletons of biological and pharmaceutical molecules. © 2012 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.


Long X.,Zhejiang University | Meng Q.,Zhejiang University | Zhang G.,Zhejiang University of Technology
Journal of Membrane Science | Year: 2014

Membrane fouling was inevitable in the ultrafiltration process in dairy industry, causing harsh reduction of the membrane performance. The current cleaning agents like acid/base and chemical surfactants would be limitedly used in future due to their detrimental effect on membrane or/and environment/health. In this study, the environmental-friendly biosurfactant rhamnolipid was for the first time applied to clean the ultrafiltration membrane fouled by protein. The cleaning by rhamnolipid under pH 9 could largely remove the foulant from the PSU, PAN and PEG-g-PSU membranes and restore the water flux to about 94% of the initial level, performing much better than the flux recovery of 50-70% for Tween 20 and SDS, the most extensively used surfactants in membrane cleaning. Moreover, rhamnolipid exhibited superior properties over the commonly used cleaner of sodium hydrate (NaOH) and even the commercial membrane cleaner in view of cleaning efficiency and operation mildness. Finally, rhamnolipid was demonstrated to be effective in cleaning the long-term fouling membrane. Taken together, rhamnolipid as an economical product of lowly costive cell-free broth shows great potential in industrial application as membrane cleaner. © 2014.


Zheng H.,Zhejiang University of Technology | Hu D.,Zhejiang University of Technology | Zhang L.,CAS Dalian Institute of Chemical Physics | Ma C.,Zhejiang University of Technology | Rufford T.,University of Western Australia
Minerals Engineering | Year: 2012

Thiol functionalized mesoporous silica (TFMS) with ordered hexagonal pore structure was fabricated by one-step synthesis pathway. The selective adsorption for precious metals was investigated using single component and binary adsorption solutions. The TFMS displayed strong affinity for gold or platinum in specific conditions with a large adsorption capacity, and showed a high selectivity in the binary solutions within 30 min. Furthermore, gold and platinum could be totally recovered by elution with 5 M HCl and 0.7 M thiourea-2 M HCl, respectively. © 2012 Elsevier Ltd. All rights reserved.


Hu F.,Zhejiang Shuren University | Hu F.,Zhejiang University of Technology
Journal of Information and Computational Science | Year: 2013

A robotic eye-to-hand coordination technology was put forward based on depth camera and Bursa coordinate transformation model. This technology employed the Zhang Zhengyou's calibration method to get intrinsic parameters of the depth camera and RGB camera, employed the triangulation measuring principles of infrared camera and infrared laser projector to get in-depth information of target, employed the imaging model of camera to finally get the coordinates of target in the coordinate system of camera, then described the relationship between camera coordinate system and world coordinate system of robot with Bursa model and finally solved the parameters of Bursa model with the indirect adjustment function model. It was demonstrated in the experiment that this simple and convenient hand-eye technology could carry out vision guiding tasks effectively. © 2013 Binary Information Press.


Dai X.,Zhejiang University of Technology | Xu X.,Zhejiang University of Technology | Li X.,Zhejiang University of Technology
Chinese Journal of Organic Chemistry | Year: 2013

Recently visible light photoredox catalysis was widely used in organic synthesis. Due to its low cost, easy availability and environmental friendliness, it has become one of the fastest growing fields in organic chemistry. This review summarizes recent development and application of visible light photoredox catalysis in organic synthesis and also gave its outlook in the future. © 2013 Chinese Chemical Society & SIOC, CAS.


Guo H.Y.,Zhejiang University of Technology | Yu Y.,Zhejiang University of Technology
Chinese Chemical Letters | Year: 2010

A series of new 7-aryl-11,12-dihydrobenzo[h]pyrimido-[4,5-b]quinoline-8,10(7. H,9. H)-diones were synthesized via three-component reaction of aldehydes, 1-naphthylamine and barbituric acid in ionic liquid. The method provided several advantages such as easy work-up, high yields and environmentally benign procedure. © 2010 Hong Yun Guo.


Zhu X.-Y.,Zhejiang University of Technology | Zheng Z.-J.,Zhejiang University of Technology | Xie J.,Zhejiang University of Technology | Wang P.,Zhejiang University of Technology
Journal of Separation Science | Year: 2012

Molecularly imprinted membranes (MIMs) for selective separation of magnolol were prepared by thermal polymerization using magnolol as the template, ethylene glycol dimethacrylate (EGDMA) as the cross-linker, 2,2- azobisisobutyronitrile (AIBN) as the initiator, organic solvent as the porogen, methacrylamide (MAM) and acrylic acid (AA) as the functional monomers and cellulose acetate as the agglutinant. Commercial filter paper was used as the supporting material. The effects of different porogens and the ratio of functional monomers on the binding and recognition capacity of MIMs were investigated, and the morphology of the membranes was examined by scanning electron microscopy (SEM). The results showed that the MIMs have the highest selectivity to magnolol when the ratio of MAM/AA was 1:4 and tetrahydrofuran (THF) with dimethyl sulfoxide (DMSO) was used as the porogen. The morphology of the imprinted membranes after template extracting is much rougher with big cavities than that of the non-imprinted membranes (NIMs) and the imprinted membranes before template extracting. The MIMs can selectively separate the magnolol. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Zhou M.,Zhejiang University of Technology
Advanced Materials Research | Year: 2013

Poly(ethylene glycol) methyl ether-grafted- graphene oxide (GO) was synthesized by a coupling reaction and formed inclusion complexes (ICs) after selective threading of the mPEG segments of the GO-mPEG through the cavities of α-cyclodextrins (α-CDs) units. The polypseudorotaxane structures of the as-obtained hydrogels were confirmed by X-ray diffraction, TGA, DSC, and SEM. The complexation of the mPEG segments with α-CDs and the hydrogen-bond interaction between CDs resulted in the formation of supramolecular hybrid hydrogels with a strong network. The resultant hybrid hydrogels were found to be thermo-responsive, and could be applied as a promising drug delivery system. © (2013) Trans Tech Publications, Switzerland.


Zhang Y.J.,Zhejiang University of Technology | Wang Y.G.,Zhejiang University of Technology
Applied Organometallic Chemistry | Year: 2012

A very efficient solid-phase synthesis of substituted benzofuran using polymer-supported selenium resin is described. The advantages of the new method are good yields, high purity, straightforward operations, broad range and high diversity of products, lack of odor, and good stability of the resins. The easy work-up procedure makes the method suitable for building parallel libraries. © 2012 John Wiley & Sons, Ltd.


Ning X.,Zhejiang University of Technology | Zhao C.,Zhejiang University of Technology | Shen J.,Zhejiang University of Technology
Procedia Engineering | Year: 2011

The design of a vehicle suspension, which is truly a multi-degree of freedom mechanism, is really challenging. This paper primarily focuses on Kinematics and Dynamic analysis of the system in ADAMS. A specific module of chassis platform is developed to analyze suspension ride comfort on adaptability to different vehicle with ADAMS/Car. The work intention is to make a parametric ADAMS model and then link it to a Knowledge Based Engineering application to facilitate designer to quickly carry out designing iterations in order to reduce development time. The Knowledge Based Engineering software is made using object oriented language called 'Object Definition Language' which is developed using VC++ software languages. The module not only carry through parametric modeling of front and rear suspension and other subsystems of chassis quickly and compactly, but also can carry on the analysis and optimization of various factors those have crucial impact on ride comfort. The module offers two test-bend, vehicle virtual simulation test stand and four-post test rig. Finally, the module is applied to analyze two kinds of cars which used chassis platform: front and rear frequency determination, pulse inspiration simulation and Broad simulation. The results show that the chassis platform being adopted by two kinds of cars meet the ride comfort requirements. © 2010 Published by Elsevier Ltd.


Shen C.,Zhejiang University | Zhang G.,Zhejiang University of Technology | Meng Q.,Zhejiang University
Biochemical Engineering Journal | Year: 2010

Various mechanisms are involved in drug hepatotoxicity including reactive intermediates, steatosis, phospholipidosis, mitochondrial dysfunction, etc. Although 3D cultured hepatocytes reflected more CYP 450 mediated reactive intermediates than traditional 2D cultured hepatocytes, the 3D model has not been evaluated for drug-induced phospholipidosis. This study applied 3D cultured hepatocytes in gel entrapment for drug-induced phospholipidosis, and amiodarone was used as a model drug. By amiodarone exposure for 48 h, 3D cultured hepatocytes showed large number of lysosomal lamellar bodies (indicating phospholipidosis) and toxic response at a low dose of 2.5 μM, equivalent to toxic serum concentration in rats. This sensitivity to amiodarone-induced phospholipidosis might relate to the more intracellular drug distribution in 3D cultured hepatocytes. Moreover, steatosis, mitochondrial injury and oxidative stress were all sensitively detected in 3D cultured hepatocytes, well reflecting the involvement of these mechanisms in amiodarone hepatotoxicity. In addition, pretreatment of 3D cultured hepatocytes by CYP 3A1/2 inhibitor (ketoconazole) significantly reduced the toxicity of amiodarone, indicating the positive mediation of CYP 3A1/2. By comparison, 2D cultured hepatocytes did not show significant phospholipidosis and involvement of CYP 3A1/2. In conclusion, hepatocytes in 3D culture well reflected amiodarone toxicity and thus could be a promising model for phospholipidosis study. © 2010 Elsevier B.V. All rights reserved.


Zhu Y.-H.,Zhejiang University of Technology | Leung V.C.M.,University of British Columbia
IEEE Transactions on Wireless Communications | Year: 2010

To achieve a long run-time for battery-operated portable electronic devices that incorporate wireless transceivers, efficient power management of the radio is a critical requirement. The power management function of IEEE 802.11 wireless local area networks (WLANs) allows stations (STAs) to operate in the doze mode so that their power consumption is significantly reduced. Hence, efficient algorithms to manage when and how often a STA enters and exits doze mode are crucial to battery-operated STAs. We address this problem by developing a novel model for stochastic analysis of timer-based power management in infrastructure IEEE 802.11 WLANs. Based on this model, the probabilities that a STA is active, idle, or dozing are derived, and the power consumption of the STA, number of frames buffered, and average delay per frame are obtained. These results enable an efficient power management algorithm that optimizes the idle timer and doze duration at the STA and the frame buffer at the access point. Moreover, similar statistics for the basic power management method in the IEEE 802.11 standard are derived as a special case of the proposed timer-based power management scheme. Numerical results are presented to demonstrate the effectiveness of the proposed algorithms. © 2006 IEEE.


Li X.,CAS Nanjing Institute of Soil Science | Li X.,Zhejiang University of Technology | Wu Y.,CAS Nanjing Institute of Soil Science | Lin X.,CAS Nanjing Institute of Soil Science | And 2 more authors.
Soil Biology and Biochemistry | Year: 2012

The potential of mushroom cultivation substrate (MCS) in bioremediation was examined in polycyclic aromatic hydrocarbon (PAH)-contaminated soil. After a 60-day incubation, 32.9% dissipation of the 15 studied PAHs was observed in MCS-amended microcosms, with anthracene, benzo(a)pyrene and benzo(a)anthracene being the most degradable PAHs. MCS significantly increased the abundance and changed the community compositions of bacteria, fungi and aromatic hydrocarbon degraders. Two species belonging to the Sordariomycetes of the Ascomycota were enriched in all MCS-treated soil samples, and coupled with the unique changes in the PAH profile, this implies the involvement of laccase-like enzymes. Limited improvement was observed after adding Pleurotus ostreatus, possibly because of its poor colonization of the soil. In addition, alfalfa appeared to antagonize the bioremediation effects of MCS. The results of this study suggest that MCS can be a cost-effective and green biostimulation agent, thereby providing support for the development of MCS-based biostimulation of PAH-contaminated soil. © 2012 Elsevier Ltd.


Zhang Z.,Zhejiang University of Technology | Wang S.,Zhejiang University of Technology | Liu D.,Zhejiang University of Technology | Jordan M.I.,University of California at Berkeley
Journal of Machine Learning Research | Year: 2012

In this paper we propose a novel framework for the construction of sparsity-inducing priors. In particular, we define such priors as a mixture of exponential power distributions with a generalized inverse Gaussian density (EP-GIG). EP-GIG is a variant of generalized hyperbolic distributions, and the special cases include Gaussian scale mixtures and Laplace scale mixtures. Furthermore, Laplace scale mixtures can subserve a Bayesian framework for sparse learning with nonconvex penalization. The densities of EP-GIG can be explicitly expressed. Moreover, the corresponding posterior distribution also follows a generalized inverse Gaussian distribution. We exploit these properties to develop EM algorithms for sparse empirical Bayesian learning. We also show that these algorithms bear an interesting resemblance to iteratively reweighted l2 or l1 methods. Finally, we present two extensions for grouped variable selection and logistic regression. © 2012 Zhihua Zhang, Shusen Wang, Dehua Liu and Michael I. Jordan.


Shen J.N.,Zhejiang University of Technology | Yu C.C.,Zhejiang University of Technology | Ruan H.M.,Zhejiang University of Technology | Gao C.J.,National Engineering Research Center for Liquid Separation Membrane | Van der Bruggen B.,Catholic University of Leuven
Journal of Membrane Science | Year: 2013

Carbon nanotube enhanced thin-film nanocomposite membranes were prepared by incorporating carbon nanotubes (CNTs) into the active layers of membranes used for water treatment. For inclusion into these active layers, a grafting procedure for carbon nanotubes was set up to increase their hydrophobicity. Multiwalled carbon nanotubes (MWNTs) grafted by poly(methyl methacrylate) (PMMA) were synthesized via a microemulsion polymerization of methyl methacrylate (MMA) in the presence of acid-modified multiwalled carbon nanotubes (c-MWNTs). Subsequently, polyamide thin-film nanocomposite (TFN) membranes containing PMMA-MWNTs were prepared via interfacial polymerization. Morphology studies demonstrate that MWNTs have been successfully embedded into the active polyamide layer. The rejection of Na2SO4 was high (99%), and the water flux was about 62% increased compared to the thin-film composite membrane when using 2g/L piperazine (PIP) in the aqueous phase, 4g/L trimesoyl chloride (TMC) and 0.67g/L PMMA-MWNTs in the organic phase, which demonstrates that PMMA-MWNTs significantly improve selectivity and permeability. © 2013 Elsevier B.V.


Chen J.-Y.,Zhejiang University of Technology | He H.-H.,Zhejiang University of Technology
Information Sciences | Year: 2016

Most data streams encountered in real life are data objects with mixed numerical and categorical attributes. Currently most data stream algorithms have shortcomings including low clustering quality, difficulties in determining cluster centers, poor ability for dealing with outliers' issue. A fast density-based data stream clustering algorithm with cluster centers automatically determined in the initialization stage is proposed. Based on data attribute relationships analysis, mixed data sets are filed into three types whose corresponding distance measure metrics are designed. Based on field intensity-distance distribution graph for each data object, linear regression model and residuals analysis are used to find the outliers of the graph, enabling cluster centers automatic determination. After the cluster centers are found, all data objects can be clustered according to their distance with centers. The data stream clustering algorithm adopts an online/offline two-stage processing framework, and a new micro cluster characteristic vector to maintain the arriving data objects dynamically. Micro clusters decay function and deletion mechanism of micro clusters are used to maintain the micro clusters, which reflects the data stream evolution process accurately. Finally, the performances of the proposed algorithm are testified by a series of experiments on real-world mixed data sets in comparison with several outstanding clustering algorithms in terms of the clustering purity, efficiency and time complexity. © 2016 Elsevier Inc. All rights reserved.


Huang Y.,Zhejiang University of Technology | Wang A.,Zhejiang University of Technology
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2012

In this paper, we study non-Gaussianity generated by a single scalar field in slow-roll inflation in the framework of the nonrelativistic general covariant Hořava-Lifshitz theory of gravity with the projectability condition and an arbitrary coupling constant λ, where λ characterizes the deviation of the theory from general relativity (GR) in the infrared. We find that the leading effect of self-interaction, contrary to the case of the minimal scenario of GR, is in general of the order α ^n3 /2, where is a slow-roll parameter, and α ^n(n=3,5) are the dimensionless coupling coefficients of the sixth-order operators of the Lifshitz scalar and have no contributions to power spectra and indices of both scalar and tensor. The bispectrum, comparing with the standard one given in GR, is enhanced and gives rise to a large value of the nonlinearity parameter f NL. We study how the modified dispersion relation with high order moment terms affects the evaluation of the mode function and in turn the bispectrum, and we show explicitly that the mode function takes various asymptotic forms during different periods of its evolution. In particular, we find that it is in general of superpositions of oscillatory functions, instead of plane waves like in the minimal scenario of GR. This results in a large enhancement of the folded shape in the bispectrum. © 2012 American Physical Society.


Cao H.,Nanjing College of Chemical Technology | Wang R.,Zhejiang University of Technology
Advanced Materials Research | Year: 2013

A quantitative structure-property relationship (QSPR) model for prediction of standard net heat of combustion (ΔHc°) was developed based on the ant colony optimization (ACO) method coupled with the partial least square (PLS) for variable selection. For developing this model, a diverse set of 1650 organic compounds were used, and 1481 molecular descriptors were calculated for every compound. Four molecular descriptors were screened out as the parameters of the model, which was finally constructed using multi-linear regression (MLR) method. The squared correlation coefficient R2 of the model was 0.995 for the training set of 1322 compounds. For the test set of 328 compounds, the corresponding R2 was 0.996. The results of this study showed that an accurate prediction model for ΔHc° could be obtained by using the ant colony optimization method. Moreover, this study can provide a new way for predicting the ΔHc° of organic compounds for engineering based on only their molecular structures. © (2013) Trans Tech Publications, Switzerland.


Liu A.,Zhejiang University of Technology | Yu L.,Zhejiang University of Technology | Zhang W.-A.,Zhejiang University of Technology
Journal of Process Control | Year: 2012

The moving horizon estimation (MHE) problem is investigated in this paper for a class of networked systems with multiple packet dropouts. The packet dropout process is modeled as a Bernoulli random process and the networked system is described as a stochastic parameter system model. By choosing a stochastic cost function, a novel solution strategy is presented for MHE optimization problem with multiple packet dropouts. By considering noise constraints, the LOQO algorithm is used to solve the constrained MHE problem. Moreover, the convergence properties of the estimator are studied. Finally, two examples are given to demonstrate the effectiveness of the proposed method and the practical advantages of the MHE method. © 2012 Elsevier Ltd. All rights reserved.


Ma C.,Zhejiang University of Technology | Kang L.,Zhejiang University of Technology | Shi M.,Zhejiang University of Technology | Lang X.,Zhejiang University of Technology | Jiang Y.,Zhejiang University of Technology
Journal of Alloys and Compounds | Year: 2014

This paper introduces a simple and reproducible chemical process for synthesis of Pt-mesoporous tungsten carbide/carbon composites composites Pt-m(WC/C) by means of a soft-template method. In this process, low-molecular-weight phenolic resol acted as the precursor both for carbon support and also the carbon resource of tungsten carbide. Tungsten hexachloride was used as a tungsten precursor along with different amount of triblock copolymer Pluronic F127 as pore-forming component. The best performance of Pt-m(WC/C) towards methanol oxidation is found when the mass ratios of WCl 6:F127 is 1:0.6. The composite presents an improved methanol oxidation performance evidenced by a negative shift in onset potential, and increase of peak current density, compared with commercial Pt/C. The difference is explained by the adding of appropriate amount of F127 which facilitates the construction of mesoporous matrix structure of WC/C. © 2013 Published by Elsevier B.V.


Tang Y.,Zhejiang University of Technology | Tan X.,Zhejiang University of Technology | Hou G.,Zhejiang University of Technology | Zheng G.,Zhejiang University of Technology
Electrochimica Acta | Year: 2014

A novel nanocomposite of crystalline Li4Ti5O 12-coated TiO2 nanotube arrays (Li4Ti 5O12/TNTA) was synthesized by anodic oxidation and sol-gel method as three-dimensional (3D) anode for Li-ion batteries. The 3D nanotubular structure was well retained in Li4Ti5O12/TNTA, and the pure and nanocrystalline Li4Ti5O12 formed on the surface of TNTA by the simple, template-free and low-temperature process. The morphology and microstructure of the samples were investigated by glancing angle X-ray diffraction (GAXRD), field emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM). In addition, the electrochemical performance was further evaluated by charge-discharge measurements and electrochemical impedance spectroscopy (EIS), and the formation mechanism of nanocrystalline of Li4Ti5O12 was discussed. The results showed that the new phase Li4Ti 5O12 separated the phases of anatase and rutile, and hindered the phase transformation of anatase to rutile severely due to the steric hindrance effect, moreover nanocrystalline Li4Ti 5O12 coating bonded TNTA firmly and improved the stability of the porous tubular structure. Li4Ti5O 12/TNTA anode with the novel nanostructure exhibited higher electrochemical performance than that of TNTA. The areal capacity of Li 4Ti5O12/TNTA anode is 400.9 μAh cm -2 at the current density of 10 μA cm-2, after 50 cycles of different current density it retains 175.8 μAh cm-2, which is almost tripled of TNTA 63.9 μAh cm-2. © 2013 Elsevier Ltd.


Hu J.,Zhejiang University of Technology | Hu X.,Zhejiang University of Technology | Chen A.,Zhejiang University of Technology | Zhao S.,Zhejiang University of Technology
Journal of Alloys and Compounds | Year: 2014

In this paper, well-dispersed superparamagnetic Fe3O4 nanoparticles have been successfully synthesized in aqueous phase by a simple co-precipitation method using ionic liquid of 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIN]BF4) as templates. As we studied, the microstructures and magnetic properties of the Fe3O4 nanoparticles were strongly influenced by the addition of ionic liquid. The possible formation mechanisms of Fe3O4 nanoparticles were proposed. It was found that the nanoparticle surface was modified with ionic liquid during the growth of the Fe3O4 nanoparticles, which could prevent the nanoparticles from aggregating effectively. In addition, ionic liquid can be easily removed using deionized water. As a result, well-dispersed Fe3O4 nanoparticles without organic cover can be obtained. Besides, the particle size and magnetic properties of Fe 3O4 nanoparticles were strongly depended on the amount of ionic liquid [BMIN]BF4. © 2014 Elsevier B.V. All rights reserved.


Zhu J.,Zhejiang University of Technology
Advanced Materials Research | Year: 2011

With the rapid development of wireless mobile communicational technology and the growing demand for lifelong education, mobile education has become a convenient and effective way of education and received considerable attention and research. To further meet the needs of study at "any time, anywhere, any style" for teachers and solve the problem that the difficulty of continuing education and training of in-service teachers, this paper uses the wireless communicational technology of 3G to create the platform for teachers' training by the main mobile terminals of mobile phone. It will promote the better service under the concept of mobile learning and it has great significance for solving the problems in the traditional training and supporting teachers to enhance the professional development.


Yang H.,Zhejiang University of Technology | Kuang B.,Cranfield University | Mouazen A.M.,Cranfield University
Advanced Materials Research | Year: 2011

Fast classification of soil with different texture is essential for site-specific application of different inputs into farmland. Total 178 soil samples with five textures were collected from Silsoe Farm, Cranfield University, England. Using a Vis/NIR spectrophotometer (LabSpec2500, ASD), spectra of soil samples were scanned for the study. Amongst various pre-processing methods, smoothing with moving average(MA), standard normal variation(SNV) and 1st derivatives were mainly investigated. PCA was applied to evaluate the discriminative capacity of the pre-processing methods on soil spectra. The score plot of PCs shows that 1st derivative with variable smoothing points can help classify soil samples much more effectively than others. With the increase of smoothing points, the cumulative variance of first few PCs in PCA tends to increase while the discriminative capability based on these PCs becomes worse. A trade-off between cumulative variance and discriminative capability should be concerned. In the study, an appropriate range of smoothing points in the 1st derivative is 7-21.


Hu H.,Zhejiang University of Technology | Zhang Q.,Zhejiang University of Technology | Cen J.,Zhejiang University of Technology | Li X.,Zhejiang University of Technology
Catalysis Communications | Year: 2014

The generation of ethylbenzene is difficult to be avoided in benzene alkylation with methanol over ZSM-5 catalysts to produce toluene and xylene. Moreover, the separation or removal of ethylbenzene from C8 aromatic yet remains as a major challenge. In this study, the effect of Pt addition on the catalytic performance of ZSM-5 for benzene alkylation was investigated. It was found that the presence of a small amount of Pt in ZSM-5 catalyst would largely suppress the formation of ethylbenzene and extend the life-span of the catalyst, which was mainly due to the hydrogenation of ethylene into ethane on Pt particles. © 2014 Elsevier B.V.


Wang G.,Zhejiang University of Technology | Chen C.,Zhejiang University of Technology | Du T.,Zhejiang University of Technology | Zhong W.,Zhejiang University of Technology
Advanced Synthesis and Catalysis | Year: 2014

A series of [2.2]paracyclophane-derived frustrated Lewis pairs (FLPs) with reversible, metal-free hydrogen activation was synthesized and successfully applied in the hydrogenation of imines in moderate to good yields. The high stability of the novel FLP system enables effective recycling of the metal-free catalysts. This reaction could also be compatible with a larger scale and developed into a pharmaceutical synthesis of cinacalcet {(R)-N-[1-(1-naphthyl) ethyl]-3-[3-(trifluoromethyl)phenyl]propan-1-amine} without heavy metal residues. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Zhao S.-L.,Zhejiang University of Technology
Journal of Nonlinear Mathematical Physics | Year: 2016

Generalized Cauchy matrix approach is used to investigate a discrete negative Ablowitz–Kaup–Newell–Segur (AKNS) equation. Several kinds of solutions more than multi-soliton solutions to this equation are derived by solving determining equation set. Furthermore, applying an appropriate continuum limit we obtain a semidiscrete negative AKNS equation and after a second continuum limit we derive the nonlinear negative AKNS equation. The reductions to discrete, semi-discrete and continuous sine-Gordon equations are also discussed. © 2016 the authors.


Shao P.,Zhejiang University of Technology | Zhang J.,Zhejiang University of Technology | Fang Z.,Curtin University Australia | Sun P.,Zhejiang University of Technology
Food Hydrocolloids | Year: 2014

Chlorogenic acid (CGA) is a polyphenol commonly existed in fruits and vegetables with a variety of bioactivities. To increase its stability and potential broader industrial application, CGA/cyclodextrin (CD) complexes were prepared using β-cyclodextrin (β-CD) and its derivative (2-hydroxypropyl)-β-cyclodextrin (2-HP-β-CD). Their inclusion complexation behavior and characterization were investigated by FT-IR, XRD, SEM, and 1H NMR spectroscopy. The morphologic and spectral studies indicated the formation of inclusion complexes. Moreover, spatial arrangements of inclusion complexes were proposed based on 1H NMR results. The antioxidant activities of the complexes were improved compared with the CGA without inclusion, and the CGA/HP-β-CD complexes showed the highest antioxidant activity. In addition, the CGA/CD complexes were added in grape juice to explore the potential on the preservation of anthocyanin and color quality. Results showed that the degradation of anthocyanins was reduced when CGA and CGA/CDs inclusions were added in grape juice due to copigmentation effect, and their copigmentation strength showed in an order of CGA/HP-β-CD complex>CGA/β-CD complex>free CGA. © 2014 Elsevier Ltd.


Zhang Y.-B.,Zhejiang University of Technology | Mu M.-J.,Zhejiang University of Technology | Weng G.-Q.,Zhejiang University of Technology
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2011

Through analyzing the islanding and non-detection zone and focusing on various islanding detection methods based on the inverter-side in distributed power generation systems, these islanding detection techniques can broadly be divided into passive detection and active detection. The detection theory, advantages and disadvantages and the improved schemes of several detection methods are evaluated comprehensively. According to the degree of the power match and the requirement of the power quality, the appropriate combination of detection methods can be selected. In this way, the best detection result can be achieved by exploiting the advantage of each method. The future research will focus on the transition from interconnected to islanding and application of islanding operation in microgrid.


Yu Z.,Zhejiang University of Technology | Zhou N.,Zhejiang University of Technology | Zhao C.,Zhejiang University of Technology | Qiu J.,Zhejiang University of Technology
PLoS ONE | Year: 2013

L-amino acid oxidase (LAAO) is attracting increasing attention due to its important functions. Diverse detection methods with their own properties have been developed for characterization of LAAO. In the present study, a simple, rapid, sensitive, cost-effective and reproducible method for quantitative in-gel determination of LAAO activity based on the visualization of Prussian blue-forming reaction is described. Coupled with SDS-PAGE, this Prussian blue agar assay can be directly used to determine the numbers and approximate molecular weights of LAAO in one step, allowing straightforward application for purification and sequence identification of LAAO from diverse samples. © 2013 Yu et al.


Liu Z.-Q.,Zhejiang University of Technology | Zhang X.-H.,Zhejiang University of Technology | Xue Y.-P.,Zhejiang University of Technology | Xu M.,Zhejiang Laiyi Biotechnology Co. | Zheng Y.-G.,Zhejiang University of Technology
Journal of Agricultural and Food Chemistry | Year: 2014

Nitrilases have recently received considerable attention as the biocatalysts for stereospecific production of carboxylic acids. To improve the activity, the nitrilase from Alcaligenes faecalis was selected for further modification by the gene site saturation mutagenesis method (GSSM), based on homology modeling and previous reports about mutations. After mutagenesis, the positive mutants were selected using a convenient two-step high-throughput screening method based on product formation and pH indicator combined with the HPLC method. After three rounds of GSSM, Mut3 (Gln196Ser/Ala284Ile) with the highest activity and ability of tolerance to the substrate was selected. As compared to the wild-type A. faecalis nitrilase, Mut3 showed 154% higher specific activity. Mut3 could retain 91.6% of its residual activity after incubation at pH 6.5 for 6 h. In a fed-batch reaction with 800 mM mandelonitrile as the substrate, the cumulative production of (R)-(-)-mandelic acid after 7.5 h of conversion reached 693 mM with an enantiomeric excess of 99%, and the space-time productivity of Mut3 was 21.50-fold higher than that of wild-type nitrilase. The Km, Vmax, and kcat of wild-type and Mut3 for mandelonitrile were 20.64 mM, 33.74 μmol mg-1 min-1, 24.45 s-1, and 9.24 mM, 47.68 μmol mg -1 min-1, and 34.55 s-1, respectively. A homology modeling and molecular docking study showed that the diameter of the catalytic tunnel of Mut3 became longer and that the tunnel volume was smaller. These structural changes are proposed to improve the hydrolytic activity and pH stability of Mut3. Mut3 has the potential for industrial applications in the upscale production of (R)-(-)-mandelic acid. © 2014 American Chemical Society.


Zhang G.-J.,Zhejiang University of Technology | Zhou X.-G.,Zhejiang University of Technology
Kongzhi yu Juece/Control and Decision | Year: 2015

To solve the problem of high computation complexity in deterministic global optimization algorithms and low success ratio in stochastic global optimization algorithms, a population-based global optimization algorithm using abstract convex underestimate is proposed. The proposed algorithm combines the abstract convexity theory within the framework of population evolutionary algorithms. The first step of the algorithm is to construct the abstract convex underestimate relaxed model for the whole initial population. Then, relevant tightening underestimate information is used to safely eliminate invalid regions and to guide the population updating. Additionally, descent directions of supporting hyperplanes are employed for local enhancement. Finally, evolutionary information helps to update supporting hyperplanes. Numerical experiment results show the effectiveness of the proposed algorithm. ©, 2015, Northeast University. All right reserved.


Yang H.,Zhejiang University of Technology | Xue B.,State Oceanic Administration | Jin L.,Zhejiang University of Technology | Zhou S.,Zhejiang University of Technology | Liu W.,Zhejiang University
Chemosphere | Year: 2011

The spatial distribution and source of polychlorinated biphenyls (PCBs) in 30 surface sediments of Yueqing Bay, Xiangshan Bay, and Sanmen Bay in Eastern China were analysed. Total concentrations of PCBs ranged from 9.33 to 19.60ngg-1 dry weight for all the sampling stations. The observed PCB levels were lower than those in areas of high urbanisation or contamination in the bay. Low-chlorinated PCBs, dominated by tri-PCB, were identified as the prevalent contaminate of surface sediments, and the top three PCB congeners were lighter chlorinated congeners (PCB 8, PCB 18 and PCB 28). These results were in agreement with the fact that tri-PCB compounds are the dominant contaminants in China. The result of the principal component analysis revealed that all samples were similar in composition to Aroclor 1242, suggesting they might originate from electrical capacitors and transformers. The levels of PCBs were significantly correlated with the total organic carbon in the sediments. © 2010 Elsevier Ltd.


Cheng S.,Zhejiang University of Technology
PETMEI'11 - Proceedings of the 1st International Workshop on Pervasive Eye Tracking and Mobile Eye-Based Interaction | Year: 2011

Eye-tracking is a valuable tool for mobile device usability research, but there are still many challenges about how to create good usability evaluation, such as the accurate enough eye-movement data from the small view angle on a real mobile device. This paper presents one research framework, which combines the remote eye-tracker and portable eye-tracker for both quantitive and qualitative evaluation. An example is reported in which a mobile device user interface is analyzed in on-screen simulation using a remote eye-tracker, and with the real device using a portable eye-tracker. We get the usability problem lists and design advices at the end. It illustrates the feasibility and effectiveness for the proposed research framework. © 2011 ACM.


Wang P.,Zhejiang University of Technology
AIP Advances | Year: 2012

In this paper we study the time evolution of an observable in the interacting fermion systems driven out of equilibrium. We present a method for solving the Heisenberg equations of motion by constructing excitation operators which are defined as the operators  satisfying [ Ĥ, Â] = λ Â. It is demonstrated how an excitation operator and its excitation energy λ can be calculated. By an appropriate supposition of the form of  we turn the problem into the one of diagonalizing a series of matrices whose dimension depends linearly on the size of the system.We perform this method to calculate the evolution of the creation operator in a toy model Hamiltonian which is inspired by the Hubbard model and the nonequilibrium current through the single impurity Anderson model. This method is beyond the traditional perturbation theory in Keldysh-Green's function formalism, because the excitation energy λ is modified by the interaction and it will appear in the exponent in the function of time.© Copyright 2012 Author(s).


Shi H.,Zhejiang University of Technology
Acta Crystallographica Section E: Structure Reports Online | Year: 2010

The title compound, C22H34O3, was synthesized from isosteviol. The asymmetric unit contains of two independent mol-ecules with the same absolute configurations. In both the mol-ecules, the three six-membered rings adopt chair conformations, the stereochemistry of the A/B and B/C ring junctions are trans, and the five-membered ring D adopts an envelope conformation.


Chen J.,Zhejiang University of Technology | Dai Q.,Zhejiang University of Technology | Wang J.,Zhejiang University of Technology
Separation and Purification Technology | Year: 2014

The catalyst of cerium supported on activated carbon (Ce/AC) for ozonation was prepared and the catalytic activity was evaluated by the degradation of p-toluenesulfonic acid (p-TSA). The results showed that Ce/AC catalyst could not only greatly enhance the degradation of p-TSA but also significantly increase the efficiency of COD removal by ozonation. The COD removal could reach 74.1% with the Ce/AC catalyst at 60 min, while the effects of activated carbon (AC) catalyst and without catalyst were only 62.4% and 50.8%, respectively. The superiority of Ce/AC catalyst was attributed to the fact that cerium increased the generation of hydroxyl radicals (OH), which could react with p-TSA and intermediate to form oxidized products rapidly. Based on the intermediates detected by GC/MS, IC and HPLC, a possible degradation pathway of p-TSA was proposed. Our aim is to provide basic data and theoretical support for pharmaceutical wastewater treatment by catalytic ozonation.© 2014 Published by Elsevier B.V.


Li X.,Zhejiang University of Technology | Fang M.,Zhejiang University of Technology | Hu P.,Zhejiang University of Technology | Hong G.,Zhejiang University of Technology | And 2 more authors.
Advanced Synthesis and Catalysis | Year: 2014

A practical and environmentally friendly strategy for generating alkoxycarbonyl radicals from readily available carbazates under metal-free conditions has been developed. In the presence of tetrabutylammonium iodide and tert-butyl hydroperoxide, 2-isocyanobiphenyls smoothly underwent radical alkoxycarbonylation with carbazates to afford phenanthridine-6-carboxylates. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Ding C.,Zhejiang University of Technology
Advanced Materials Research | Year: 2012

For the long elastic pile, the "m" method is often used to solve the elastic deflection differential equation, and the bending rigidity of pile can be obtained. The single pile can be replaced by one column fixed at two ends which has the same rigidity of the pile to solve the interaction problem of pile, base beam, and upper structure. So the influences of the pile construction error on base beam can be calculated. The analysis example shows that compared with no construction error of pile, the bending moment and the reinforcement of base beam increase greatly in the scope of allowable maximal construction error stipulated by the Code. The calculation method of the internal forces of base beam is put forward. © (2012) Trans Tech Publications, Switzerland.


Zhao J.,Zhejiang University of Technology | Xu X.,Zhejiang University of Technology | Li X.,Zhejiang University of Technology | Wang J.,Zhejiang University of Technology
Catalysis Communications | Year: 2014

The effect of Sn on the Pd/AC catalysts for the selective hydrogenation of cinnamaldehyde (CALD) was investigated. TEM, EDX, XRD and XPS have been employed to characterize Pd-Sn/AC. 80% cinnamyl alcohol (COL) selectivity can be obtained at 96% CALD conversion, even 100% selectivity can be achieved at 3% conversion. The PdSn type alloy is responsible for the enhancement of unsaturated alcohol (UA) selectivity, as confirmed by XRD and EDX. XPS technique confirmed that the promoting effect of Sn was related to Pd-Sn interaction. The favorable adsorption of C = O bond on the PdSn has been supported by means of density functional theory. © 2013 Elsevier B.V.


Liu X.-H.,Zhejiang University of Technology | Xu X.-Y.,Southern Research Institute | Tan C.-X.,Zhejiang University of Technology | Weng J.-Q.,Zhejiang University of Technology | And 2 more authors.
Pest Management Science | Year: 2015

Background: 1,2,4-Triazolo[4,3-a]pyridine derivatives represent a new series of compounds that possess good herbicidal activity against Echinochloa crusgalli (L.) Beauv., Setaria faberii, Digitaria sanguinalis (L.) Scop., Brassica juncea Coss., Amaranthus retroflexus L. and Eclipta prostrata L. Results: A total of 23 novel 1,2,4-triazolo[4,3-a]pyridine derivatives were synthesised and identified by 1H NMR, IR, single-crystal X-ray diffraction, mass-spectroscopic and elemental analysis, and their herbicidal activities were tested against E. crusgalli (L.) Beauv., S. faberii, D. sanguinalis (L.) Scop., B. juncea Coss., A. retroflexus L. and E. prostrata L. at 150 g a.i. ha-1. It was found that the title compound 8-chloro-3-(4-propylphenyl)-[1,2,4]-triazolo[4,3-a]pyridine possesses high herbicidal activity and a broad spectrum against the 22 test weeds, with an inhibition effect of about 50% at a dosage of 37.5 g a.i. ha-1, and is safe for corn, cotton and rice at a dosage of 150 g a.i. ha-1. Furthermore, comparative molecular field analysis contour models were established to study the structure-activity relationship of the title compounds. Conclusion: It is possible that, with further structure modification, 1,2,4-triazolo[4,3-a]pyridine derivatives, which possess good herbicidal activities, may become novel lead compounds for the development of herbicides against dicotyledonous weeds. © 2014 Society of Chemical Industry.


Nie R.,Zhejiang University | Shi J.,Zhejiang University | Du W.,Zhejiang University | Ning W.,Zhejiang University of Technology | And 2 more authors.
Journal of Materials Chemistry A | Year: 2013

A sandwich-like N-doped graphene/Co3O4 hybrid was prepared via a simple one-pot hydrothermal reaction in a solution of NH 3. Characterizations disclosed that highly dispersed Co 3O4 nanoparticles with dominant exposed {112} and {110} planes were fabricated on both sides of well-exfoliated N-doped graphene; N-dopants in the graphene matrix can prevent re-graphitization of graphene, strengthen the interaction between Co3O4 and the graphene matrix, and improve the dispersion of Co3O4. This hybrid (Co3O4/RGO-N) exhibited superior activity and stability for the epoxidation of styrene compared to bulk Co3O 4 and N-free graphene supported Co3O4. At the same time, the resulting catalyst also showed high compatibility with various olefins and alcohols with good conversion and high selectivity. This synergistic strategy can provide simple, efficient and versatile blue-prints for low-cost fabrication of graphene-based nanocomposites for extending applications where graphene has rarely been exploited and beyond. © 2013 The Royal Society of Chemistry.


Tao X.,Zhejiang University of Technology | Chen X.,Zhejiang University of Technology | Xia Y.,Zhejiang University of Technology | Huang H.,Zhejiang University of Technology | And 4 more authors.
Journal of Materials Chemistry A | Year: 2013

Highly mesoporous carbon foam (MCF) with a high specific surface area has been successfully synthesized via a facile, cost-effective and template-free Pechini method. The as-prepared MCF exhibits a high specific surface area of 1478.55 m2 g-1 and a commendable pore size distribution for impregnating sulfur. After sulfur loaded in MCF, the relationship between pore size distribution of mesoporous carbon foam/sulfur nanocomposite (MCF/S) and the content of loaded sulfur is investigated in detail, which impacts on subtle variation of lithium storage performance. MCF/S (57.22 wt%) delivers an initial discharge of 1285 mA h g-1 and retains 878 mA h g -1 after 50 cycles. Compared with pristine sulfur, MCF/S cathodes display enhanced electrochemical performances, which can be attributed to the cross-linked hierarchical structure of MCF conductive matrix. Based on the advantages of the template-free Pechini method such as low cost, relative simplicity and atomic-scaled mixing, the MCF with hierarchical porous structure can be generalized to other practical applications including electrochemical double-layer capacitors, adsorption, separation, catalyst supports, etc. In addition, we believe that this modified Pechini method is general and can be extended to the fabrication of other types of mesoporous carbon by changing metal salts and organic reagents. © 2013 The Royal Society of Chemistry.


He Z.,Zhejiang University of Technology | Shi Y.,Zhejiang University of Technology | Gao C.,Zhejiang University of Technology | Wen L.,Zhejiang University of Technology | And 2 more authors.
Journal of Physical Chemistry C | Year: 2014

A novel visible-light-active BiOCl/BiVO4 photocatalyst with a p-n heterojunction structure was prepared using a hydrothermal method. The photocatalytic activity of the heterojunction was investigated by monitoring the change in methyl orange (MO) concentration under visible-light irradiation. The results reveal that the composite exhibited markedly improved efficiency for MO photodegradation in comparison with pure BiVO4, BiOCl, and Degussa P25. This is ascribed to the B-type heterojunction structure with a strong oxidative ability and efficient charge separation and transfer across the BiOCl/BiVO4 p-n junction. The highest activity was obtained in the BiOCl/BiVO4 heterojunction using a composite of 13 mol % BiOCl and 87 mol % BiVO4. The removal of MO was mainly initiated by valence-band holes, but dissolved oxygen also played a crucial role in consuming the conduction-band electrons. This was verified by the effects of scavengers and N2 purging. © 2013 American Chemical Society.


Zhou Z.,Zhejiang University of Technology | Shi D.,Zhejiang University of Technology | Qiu Y.,Zhejiang University of Technology | Sheng G.D.,Zhejiang University of Technology
Environmental Pollution | Year: 2010

Chars were generated by pyrolyzing pine wood at temperatures between 300 °C and 700 °C for 6 h and at 500 °C for 10-300 min. Their organic content and surface acidity decreased, and BET surface area increased, with increasing pyrolytic temperature and time. The uptake of benzene and nitrobenzene increased with increasing pyrolytic temperature and time with isotherms characterized by a transition from less to more concave-downward. The isotherms with low-temperature and short-time chars were fitted to the dual Langmuir-partition model, whereas those with high-temperature chars to the dual-Langmuir model. Calculations suggest that the organic phases of chars functioned as partition media and the uptake of benzene and nitrobenzene on carbonized chars occurred first in micropores via pore-filling and later in larger pores through capillary condensation and adsorption. It is concluded that chars may be considered to consist of the partition domain, the high-energy micropores domain and the low-energy large pores domain. © 2009 Elsevier Ltd. All rights reserved.


Xiao H.,Zhejiang University of Technology | Xia Y.,Zhejiang University of Technology | Zhang W.,Zhejiang University of Technology | Huang H.,Zhejiang University of Technology | And 2 more authors.
Journal of Materials Chemistry A | Year: 2013

Hollow α-Fe2O3 microcubes were fabricated by a facile hydrothermal method in an ethanol-water co-solvent system. The as-synthesized microcubes have a uniform size with an edge length of about 1.5 μm. Time and solvent proportion dependent experiments reveal that the ethanol adsorption and surface-protected etching mechanisms play key roles in the formation hollow cubic structures. Compared with their solid counterparts, hollow α-Fe2O3 microcubes show an enhanced electrochemical performance in terms of long-term cycling (458 mA h g -1 at a current density of 100 mA g-1 after 100 cycles) and high rate capability (859, 855, 688 and 460 mA h g-1 at current densities of 100, 200, 500 and 1000 mA g-1, respectively). These remarkable electrochemical properties can be attributed to the unique hollow microstructure, which could retain structural stability, relieve stress and increase reaction areas. This journal is © The Royal Society of Chemistry 2013.


Xia Z.,Zhejiang University of Technology
Mathematical Methods in the Applied Sciences | Year: 2014

In this paper, we propose a new class of functions called pseudo S-asymptotically ω-periodic function in the Stepanov sense and explore its properties in Banach spaces including composition results. Furthermore, the existence and uniqueness of the pseudo S-asymptotically ω-periodic mild solutions to Volterra integro-differential equations is investigated. Applications to integral equations arising in the study of heat conduction in materials with memory are shown. © 2014 John Wiley & Sons, Ltd.


Wang H.-Y.,Zhejiang University of Technology | Huang H.-F.,Zhejiang University of Technology | Jiang J.-Q.,Glasgow Caledonian University
Separation and Purification Technology | Year: 2011

This paper is concerned with the preparation and use of HDTMA-modified clinoptilolite (Ct.) to remove phenol and investigate the effect of cation ions on the phenol sorption performance. It was found that HDTMA-modified Ct. removed phenol more efficiently than natural Ct. This can be attributed to the enhanced hydrophobic surface properties of HDTMA-modified Ct. In the presence of Ca 2+ and Mg2+ ions, the phenol sorption by HDTMA-modified Ct. was further improved. The formation of neutral ion pair of metal-phenol and increasing hydrophobic interactions were contributed to such phenomena. © 2011 Elsevier B.V. All rights reserved.


Chen X.-P.,Zhejiang University of Technology | Qian L.-L.,Zhejiang University of Technology | Jiang H.,Zhejiang University | Chen J.-H.,Zhejiang University
International Journal of Clinical Oncology | Year: 2011

Background: Ginsenoside Rg3 is an extract from the natural product ginseng. Previous studies have linked Rg3 with anti-metastasis of cancer in vivo and in vitro. CXC receptor 4 (CXCR4) is a vital molecule in migration and homing of cancer to the docking regions. Methods: In this study, the effects of Rg3 on CXCR4 expression were investigated in a breast cancer cell line. Immunohistochemistry, chemotaxis and wound healing mobility assays were performed in cultured MDA-MB-231 cells. Results: At a dosage without obvious cytotoxicity, Rg3 treatment elicits a weak CXCR4 stain color, decreases the number of migrated cells in CXCL12-elicited chemotaxis and reduces the width of the scar in wound healing. Conclusion: This work suggests that Rg3 is a new CXCR4 inhibitor from a natural product. © Japan Society of Clinical Oncology 2011.


Zhang W.,Zhejiang University of Technology | Wu D.,Zhejiang University of Technology | Zhang J.,Zhejiang University of Technology | Liu Y.,Zhejiang University of Technology
European Journal of Organic Chemistry | Year: 2014

A regiospecific synthesis of substituted 2-nitrobenzaldehydes from substituted benzaldehydes has been developed that involves a three-step process with palladium-catalyzed chelation-assisted C-H nitration as the key step. In the process, O-methyl aldoxime serves as a removable directing group for the palladium-catalyzed ortho-nitration of substituted benzaldoximes and it can be removed in subsequent conversion of the resulting 2-nitrobenzaldoximes into 2-nitrobenzaldehydes. © 2014 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.


Lou S.-J.,Zhejiang University of Technology | Xu D.-Q.,Zhejiang University of Technology | Xia A.-B.,Zhejiang University of Technology | Wang Y.-F.,Zhejiang University of Technology | And 3 more authors.
Chemical Communications | Year: 2013

A novel Pd(OAc)2-NFSI-TFA system was developed for the highly selective ortho-monofluorination directed by diverse aryl-N-heterocyclic directing groups e.g., quinoxaline, pyrazole, benzo[d]oxazole, and pyrazine derivatives. A Pd(ii/iv) catalytic cycle was proposed based on the ESI-MS/MS studies. © The Royal Society of Chemistry 2013.


Xia Y.,Zhejiang University of Technology | Zhang W.,Zhejiang University of Technology | Xiao Z.,Zhejiang University | Huang H.,Zhejiang University of Technology | And 5 more authors.
Journal of Materials Chemistry | Year: 2012

In this work, hierarchically porous NiO/C microspheres were successfully synthesized via a facile biotemplating method using natural porous lotus pollen grains as both the carbon source and the template. The as-prepared hierarchically porous NiO/C microspheres exhibited a large specific surface area and multiple pore size distribution, which could effectively increase the electrochemical reaction area and allow better penetration of the electrolyte. The Raman results also confirmed that the pollen grains have been well carbonized, which could provide good electronic conductivity. The specific capacities of the porous NiO/C microspheres after every 10 cycles at 0.1, 0.5, 1, and 3 A g -1 are about 698, 608, 454 and 352 mAh g -1. As an anode material in a Li ion half-cell, these unique hybrid hierarchically porous NiO/C microspheres exhibited fascinating electrochemical performance. © 2012 The Royal Society of Chemistry.


Xiao Z.,Zhejiang University | Xia Y.,Zhejiang University of Technology | Ren Z.,Zhejiang University | Liu Z.,Zhejiang University | And 5 more authors.
Journal of Materials Chemistry | Year: 2012

In this work, single-crystalline α-FeOOH nanorods with a length of 400-700 nm and a diameter of 20-80 nm were successfully synthesized via a facile template-free hydrothermal method. Single-crystalline mesoporous α-Fe2O3 and Fe3O4 nanorods could be obtained from these α-FeOOH precursors after calcining at 350 °C in air and 500 °C in nitrogen, respectively. The as-prepared single-crystalline mesoporous α-Fe2O3 and Fe 3O4 nanorods exhibited a large specific surface area and porosity, effectively enhancing the electrochemical reaction area and accommodate the strain during the charge-discharge cycling process. © 2012 The Royal Society of Chemistry.


Yang X.,Zhejiang University of Technology | Wiltschko M.,University of British Columbia
Journal of Pragmatics | Year: 2016

This paper focuses on the form, distribution and function of the sentence-final particle ha (哈) in Northern Mandarin. To understand its function, we also compare ha with two other Mandarin particles: ba and the A-Not-A tags (dui bu dui and shi bu shi) in their confirmational use. The interpretation of these particles is highly context-dependent. We show that there are three distinct phonetic forms of ha and each of them has a different pragmatic function. Ha1 is used for confirmation of the speaker's stance; ha2 is used for confirmation of the addressee's stance; and ha3 is a narrative marker. We develop an analysis according to which the two confirmational instances of ha modify the illocutionary act of an utterance. We also show that the choice among particles with seemingly identical function is determined by the strength of the speaker's stance toward the proposition as well as considerations of politeness. © 2016 Elsevier B.V.


Zhang D.,Zhejiang University of Technology | Yu L.,Zhejiang University of Technology | Zhang W.-A.,Zhejiang University of Technology
Signal Processing | Year: 2011

In this paper, the fault detection problem is investigated for a class of discrete-time switched linear systems with time-varying delays. The main purpose is to design a fault detection filter such that, for all unknown inputs, control inputs and time delays, the estimation error between the residual and fault is minimized in an exponential way. The fault detection problem is converted into an exponential H∞ filtering problem. By using a newly constructed Lyapunov functional and the average dwell time scheme, a novel delay-dependent sufficient condition for the solvability of this problem is established in terms of linear matrix inequalities (LMIs). A numerical example is given to demonstrate the effectiveness of the developed theoretical results. © 2010 Elsevier B.V. All rights reserved.


Chen J.-X.,Fuzhou University | Lin S.-W.,Fuzhou University | Zhou X.-L.,Zhejiang University of Technology
International Journal of Machine Tools and Manufacture | Year: 2016

In this paper, a comprehensive error analysis method is proposed to discover how the geometric error propagation through every motion axis, and to find out which error parameters have greater impact on the tool posture error at the end of the kinematic chain. As the geometric error of a motion axis can be regarded as the differential movement, an error model for a four-axis machine tool is established to calculate the tool posture error with all the geometric error parameters. Then a cumulative process of the differential movements of every axis is proposed to describe the error propagation process when moving the tool to the given position. Moreover, the workspace of the machine tool is discretized into an amount of points with a uniform sampling method on the measured positions of the geometric error. Then, a Spearman rank correlation method is presented to find out how closely linked between a single error parameter and the tool posture error all over the sampling workspace. Hence, the ten key error parameters are selected according to the analysis results in the three-axis and four-axis sampling workspace. Finally, an experiment is conducted on the four-axis machine tool with a three-axis controlled trajectory to verify the effectiveness and correctness of the proposed method using a double ballbar. © 2016 Elsevier Ltd. All rights reserved.


Huang H.,Zhejiang University of Technology | Xia Y.,Zhejiang University of Technology | Tao X.,Zhejiang University of Technology | Du J.,Zhejiang University of Technology | And 3 more authors.
Journal of Materials Chemistry | Year: 2012

In this communication, we report a facile and novel molten salt electrolysis method to prepare high-quality graphene sheets. Transmission electron microscopy (TEM) and atomic force microscopy (AFM) confirmed that the final products exfoliated from the electrolysis of graphite cathode in the molten LiOH medium are mainly graphene sheets (approx. 80 wt% conversion efficiency). Raman spectroscopy revealed that the as-formed graphene sheets have significantly low density of defects. Based on these observations, the exfoliation mechanism of graphite cathode into graphene sheets through lithium intercalation-expansion-microexplosion processes was proposed. The discovery of a molten salt electrolysis method presents us with the possibility for large scale and continuous production of graphene. © The Royal Society of Chemistry 2012.


Nie R.,Zhejiang University | Shi J.,Zhejiang University | Xia S.,Zhejiang University | Shen L.,Zhejiang University of Technology | And 3 more authors.
Journal of Materials Chemistry | Year: 2012

Rod-like MnO 2 uniformly attached on both side of GO sheets (MnO 2/GO) is an efficient heterogeneous catalyst for the synthesis of primary amides from primary alcohols and ammonia as well as from aldehydes or nitriles. Water is the best solvent for these reactions, analytically pure crystals of product could be isolated by simply cooling in ice and this catalyst has excellent recyclability. © 2012 The Royal Society of Chemistry.


Wang L.,Zhejiang University of Technology | Tang W.,Zhejiang University of Technology | Jing Y.,Nankai University | Su L.,Zhejiang University of Technology | Zhou Z.,Nankai University
ACS Applied Materials and Interfaces | Year: 2014

As substitutions for transition metal oxides (MOs), transition metal carbonates (MCO3) have been attracting more and more attention because of their lithium storage ability in recent years. Is MCO3 better than MOs for lithium storage? To answer this question, monodisperse CoCO3 and CoO microspindles with comparable structures were synthesized and investigated as a case study. Excluding its structural effect, we found CoCO3 still exhibited reversible capacities and rate capabilities much higher than those of CoO. The reversible capacity of CoCO 3 after 10 cycles was 1065 mAh g-1, 48.2% higher than that (∼720 mAh g-1) of CoO. Furthermore, the greatly different electrochemical behaviors were investigated by analyzing the discharge-charge profiles, cyclic voltammetry curves, and Nyquist plots in depth. This work can improve our understanding of the lithium storage advantages of MCO3 against MOs and enlighten us in terms of developing high-performance MCO 3 with favorable structures. © 2014 American Chemical Society.


Zhang D.,Zhejiang University of Technology | Yu L.,Zhejiang University of Technology
Neural Networks | Year: 2012

This paper is concerned with the exponential state estimation for Markovian jumping neural networks with time-varying discrete and distributed delays. The parameters of the neural networks are subject to the switching from one mode to another according to a Markov chain. By constructing a novel Lyapunov-Krasovskii functional and developing a new convex combination technique, a new delay-dependent exponential stability condition is proposed, such that for all admissible delay bounds, the resulting estimation error system is mean-square exponentially stable with a prescribed noise attenuation level in the H∞ sense. It is also shown that the design of the desired state estimator is achieved by solving a set of linear matrix inequalities (LMIs). The obtained condition implicitly establishes the relations among the maximum delay bounds, H∞ noise attenuation level and the exponential decay rate of the estimation error system. Finally, a numerical example is given to show the effectiveness of the proposed result. © 2012 Elsevier Ltd.


Wang A.,Zhejiang University of Technology | Wang A.,Baylor University
Physical Review Letters | Year: 2013

Stationary, axisymmetric, and slowly rotating vacuum spacetimes in the Hořava-Lifshitz (HL) gravity are studied, and it is shown that, for any given spherical static vacuum solution of the HL theory (of any model, including the ones with an additional U(1) symmetry), there always exists a corresponding slowly rotating, stationary, and axisymmetric vacuum solution, which reduces to the former, when the rotation is switched off. The rotation is universal and only implicitly depends on the models of the HL theory and their coupling constants through the spherical seed solution. As a result, all asymptotically flat slowly rotating vacuum solutions are asymptotically identical to the slowly rotating Kerr solution. This is in contrast to the claim of Barausse and Sotiriou, in which slowly rotating black holes were reported (incorrectly) not to exist in the infrared limit of the nonprojectable HL theory. © 2013 American Physical Society.


Xie W.-D.,Zhejiang University of Technology | Luan W.,Zhejiang University of Technology
2011 International Conference on Electric Information and Control Engineering, ICEICE 2011 - Proceedings | Year: 2011

Forecasting the power supply capacity from the public grid and the power storage capacity in a public EV charging station is an important work when making a construction plan of the charging station. The power flow diagrams of charging station in different load periods and their electric quantity equations are given. The mathematical model considering the power dissipation in every subsystem of charging station is established. Through simulation calculating the Class I EV charging station which defined in the Beijing local standard about the public EV charging station the optimal allocation between the power supply capacity and the power storage capacity under the certain scale of charging station is known. The simulation example also shows that the calculating results are credible. © 2011 IEEE.


Li B.,Zhejiang University of Technology
Wuli Huaxue Xuebao/ Acta Physico - Chimica Sinica | Year: 2012

The ferroelectric thin film of lead magnesium niobate-lead titanate (PMN-PT) was fabricated and characterized using UV-Vis transmission spectroscopy, X-ray diffraction (XRD), and atomic force microscopy (AFM). To determine the photocurrent properties of the bulk hetero junction organic blend film a photovoltaic device with the structure of tin indium oxide (ITO)/PMN-PT/organic blend film /aluminum (Al)was fabricated. Under modulated laser irradiation the amplitude and polarity of the transient photocurrent varied with the bias voltage, which shows that the photocurrent polarity of a conventional bulk hetero junction organic photovoltaic device is determined by the internal electric field that is induced by the difference between the work function of the anode and cathode electrodes. A new method is proposed for investigating the photocurrent properties of bulk hetero junction organic photovoltaic devices. © Editorial office of Acta Physico-Chimica Sinica.


Li X.,Zhejiang University of Technology | Guo H.,Zhejiang University of Technology
Chinese Journal of Organic Chemistry | Year: 2012

A series of 1,4-dihydropyrano[2,3-c]pyrazoles were synthesized via four-component one-pot reaction of aromatic aldehyde, malononitrile, ethyl benzoylacetate and hydrazine or hydrazinobenzene. 1-Butyl-3-methyl imidazolium hydroxide ([bmim]OH) was used as basic ionic liquid catalyst. The effect of catalyst, reaction temperature, catalyst amount and solvent on the yield were investigated. The optimum reaction condition was determined and the possible mechanism was proposed. Besides, the catalyst could be recovered conveniently and reused for at least four times without evident loss of activity. The products were identified by 1H NMR, IR, MS techniques and elemental analysis. The present methodology offers several advantages such as milder reaction condition, shorter reaction time, excellent yield and environmental friendliness. © 2012 Chinese Chemical Society & SIOC, CAS.


Dai Q.,Zhejiang University of Technology | Shen H.,Zhejiang University of Technology | Xia Y.,Zhejiang University of Technology | Chen F.,Zhejiang University of Technology | And 2 more authors.
Separation and Purification Technology | Year: 2013

In this study, the novel PbO2 electrodes co-doped with rare earth (La and Ce) were prepared by electrodeposition technique. The rare earth co-doped electrode applied as an anode was carefully studied for the degradation of cationic gold yellow X-GL, in sono-electrochemical oxidation system. Optimal degradation conditions were achieved by investigating the effects of different parameters, such as initial concentrations, pH levels, electrolyte concentrations, current densities, on the constant frequency and power of ultrasound. Under the optimal conditions, removal rates of cationic gold yellow X-GL and COD were about 99.95% and 74.03%, respectively, after 2 h degradation. Moreover, the synergistic effect in sono-electrochemical oxidation system was also certificated and discussed. In addition, SEM images indicated that the surface of Ti/SnO2-Sb2O3/PTFE-La-Ce-β- PbO2 electrode had the dense structure and the preferred crystalline orientation, which could be helpful to improve the mass transportation and mineralization of cationic gold yellow X-GL. © 2012 Elsevier B.V. All rights reserved.


Xu L.,Zhejiang University of Technology
International Journal of Control, Automation and Systems | Year: 2011

In this paper, we study singularly perturbed impulsive stochastic delay differential systems (SPISDDSs). By establishing an L-operator delay differential inequality and using the stochastic analysis technique, we obtain some sufficient conditions ensuring the exponential p-stability of any solution of SPISDDSs for sufficiently small ε < 0. The results extend and improve the earlier publications. An example is also discussed to illustrate the efficiency of the obtained results. © ICROS, KIEE and Springer 2011.


Ru Q.-M.,Zhejiang University of Technology | Feng Q.,Zhejiang University of Technology | He J.-Z.,Zhejiang University of Technology
Food and Chemical Toxicology | Year: 2013

The levels of copper (Cu), zinc (Zn), cadmium (Cd), lead (Pb), arsenic (As), and mercury (Hg) in eight types of honey collected in China were determined. The average concentrations of the six heavy metals in the honey samples were 46.18, 1329.5, 1.34, 33.98, 13.44, and 1.65μgkg-1, respectively. All these values were below the maximum allowable contaminant levels in foods (GB2762-2005) and honey (GB14963-2011) in China. The hazard quotients of individual heavy metals and the hazard index of all six heavy metals were far below one, indicating no chronic-toxic risk from these metals for the inhabitants of Zhejiang under the current consumption rates of honey. However, the carcinogenic risk of As for the female inhabitants in Zhejiang exceeded the acceptable level of 10-4. Therefore, As is the most concerning heavy metal in honey. © 2013 Elsevier Ltd.


Zhou Y.,North China Institute of Aerospace Engineering | Zhu J.,Zhejiang University of Technology
Composite Structures | Year: 2016

The third-order shear deformation plate theory is utilized to analyze the vibration and bending of the simply-supported magneto-electro-elastic rectangular plates. The obtained analytical solution is valid for both thick and thin plates, and for arbitrary variation of material properties in the thickness direction. The natural frequencies obtained by the present study are proved to be identical with available results provided in references, which validates and verifies our formulation and programming. Parametric studies are completed for varying material gradient profile and length-to-thickness ratios. Analyses for forced vibrations and static bending of a multiferroic plate with a sinusoidal spatial variation of the pressure applied on its top surface complete the paper. © 2016 Elsevier Ltd


Sun M.-X.,Zhejiang University of Technology
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2012

This paper proposes a unified architecture of time-varying neural networks for implementing unknown time-varying mappings. The methodology of iterative learning is applied for the network training, and a modified iterative learning least squares algorithm is presented. Under the assumption of bounded input signals, convergence results of the proposed learning algorithm are given. In order to realize periodic mappings, periodic neural networks are characterized and a periodic learning algorithm is presented for training such neural networks. © 2012 Springer-Verlag.


Wang X.,Zhejiang University of Technology | Yin D.,Zhejiang University of Technology | Xu F.,Zhejiang University of Technology | Qiu B.,Zhejiang University of Technology | Gao Z.,Zhejiang University of Technology
International Journal of Fatigue | Year: 2012

The effects of stress ratio on the fatigue crack initiation and growth were investigated by a newly developed unified model, which is based on the cyclic plasticity property of material and a multiaxial fatigue damage criterion in incremental form. The cyclic elastic-plastic stress-strain field was analyzed using the general-purpose finite element software (ABAQUS) with the implementation of a robust cyclic plasticity theory. The fatigue damage was determined by applying the calculated stress-strain responses to the incremental fatigue criterion. The fatigue crack growth rates were then obtained by the unified model. Six compact specimens with a thickness less than 3.8 mm were used for the fatigue crack initiation and growth testing under various stress ratios (-1.0, 0.05, 0.1, 0.2, 0.3 and 0.5). Finite element results indicated that crack closure occurred for the specimen whose stress ratio was less than 0.3. The combined effects of accumulated fatigue damage induced by cyclic plastic deformation and possible contact of cracked surfaces were responsible for the fatigue crack initiation and growth. The predicted results agreed with the benchmark mode I fatigue crack growth experiments very well. © 2010 Published by Elsevier Ltd. All rights reserved.


Chen B.,Donghua University | Lu S.-X.,Donghua University | Li C.-H.,Donghua University | Kang Q.-S.,Donghua University | And 2 more authors.
Journal of Hazardous Materials | Year: 2011

The influence of the initial fuel temperature on the burning behavior of n-heptane pool fire was experimentally studied at the State Key Laboratory of Fire Science (SKLFS) large test hall. Circular pool fires with diameters of 100. mm, 141. mm, and 200. mm were considered with initial fuel temperatures ranging from 290. K to 363. K. Burning rate and temperature distributions in fuel and vessel wall were recorded during the combustion. The burning rate exhibited five typical stages: initial development, steady burning, transition, bulk boiling burning, and decay. The burning rate during the steady burning stage was observed to be relatively independent of the initial fuel temperature. In contrast, the burning rate of the bulk boiling burning stage increases with increased initial fuel temperature. It was also observed that increased initial fuel temperature decreases the duration of steady burning stage. When the initial temperature approaches the boiling point, the steady burning stage nearly disappears and the burning rate moves directly from the initial development stage to the transition stage. The fuel surface temperature increases to its boiling point at the steady burning stage, shortly after ignition, and the bulk liquid reaches boiling temperature at the bulk boiling burning stage. No distinguished cold zone is formed in the fuel bed. However, boiling zone is observed and the thickness increases to its maximum value when the bulk boiling phenomena occurs. © 2011 Elsevier B.V.


Chen L.,Zhejiang University of Technology | Shi H.-X.,Zhejiang University of Technology
Journal of Dispersion Science and Technology | Year: 2010

The new fluorinated acrylate emulsion was synthesized by using the intermediate perfluorous nonene and 2-hydroxyethyl methacrylate as the staring reactants via semi-continuous seeded emulsion polymerization. The structures, glass transition temperature, thermal property and water repellency of the fluorinated acrylate emulsion were characterized with FTIR, differential scanning calorimetry, thermal analysis, and contact angle meter. Influences of many factors such as the theoretical solid content, the temperature of the emulsion polymerization on the stability of the emulsion polymerization, the added amount of emulsifiers and the added amount of the initiator were studied. Results show that the stability of the emulsion polymerization is fairly good when the theoretical solid content is below 30% and the reaction temperature is 80°C and the added amount of emulsifiers and the initiator are 6.0-8.0% and 2.0% respectively. In comparison with the acylate emulsion, the thermal stability of the fluorinated acrylate emulsion is decreased but the water repellency of the fluorinated acrylate emulsion is greatly increased. © Taylor & Francis Group, LLC.


Sun D.,Zhejiang University of Technology
Biochemical and Biophysical Research Communications | Year: 2016

Escherichia coli is naturally transformable, independent on the conserved DNA uptake machinery for single-stranded DNA (ssDNA) integration. The transfer of double-stranded DNA (dsDNA) during natural transformation of E. coli is regulated by the alternative sigma factor σS. However, it remains mysterious how dsDNA transfers across the membranes and how σS regulates natural transformation of E. coli. Here, I screened for σS-regulated genes for dsDNA transfer in E. coli. The screening identified the σS-regulated genes ydcS and ydcV, both locate on the putative ABC transporter ydcSTUV operon. Considering that ydcS and ydcV are predicted to encode a periplasmic protein and an inner membrane protein for substrate binding and translocation respectively, I propose that they may mediate dsDNA translocation across the inner membrane during natural transformation. In chemical transformation of E. coli, ydcS was but ydcV was not required. Thus, YdcV should not be the channel for dsDNA translocation in artificial transformation. Together with the previous observation that the outer membrane porin OmpA mediates dsDNA transfer across the outer membrane in chemical transformation but not in natural transformation, I conclude that dsDNA transfers across the two membranes through different routes in natural and artificial transformation of E. coli. © 2016 Elsevier Inc. All rights reserved.


Huang G.,Taizhou University | Yang J.,Taizhou University | Gao J.,Zhejiang University of Technology | Wang X.,Zhejiang University of Technology
Industrial and Engineering Chemistry Research | Year: 2012

A novel intumescent flame retardant-polyacrylamide (IFR-PAM) was prepared by the copolymerization of N 1-(5,5-dimethyl-1,3,2-dioxaphosphinyl-2- yl)-acrylamide (DPAA) and acrylamide and was used to prepare various IFR-PAM/ graphene oxide (GO) thin films via layer-by-layer (LbL) assembly as a flame retardant coating system for cotton fabric. Films assembled with IFR-PAM and GO nanosheets show linear growth as a function of the number of bilayer deposited. Higher hydrophobe DPAA content of IFR-PAM results in much thicker assemblies due to hydrophobic association. The results from Xray diffraction (XRD), atomic force microscopy (AFM), and scanning electronic microscopy (SEM) indicate that the IFR-PAM/ GO ultrathin films with high homogeneity and orientation are formed by LbL assembly driven by hydrogen interaction. The thermogravimetric analysis (TGA) results indicate that the IFR-PAM/GO coating improves the thermal stability of cotton fabric. Cone calorimeter testing shows that the IFR-PAM/GO-coated fabrics become less flammable with lower peak heat release rate (PHRR) and longer time to ignition (TTI). SEM images demonstrate that the surface of the IFR-PAM/GO-coated fabrics is covered by a layer of continuous and compact char after combustion. © 2012 American Chemical Society.


Huang G.,Taizhou University | Liang H.,Taizhou University | Wang X.,Zhejiang University of Technology | Gao J.,Zhejiang University of Technology
Industrial and Engineering Chemistry Research | Year: 2012

A flame-retardant poly(acrylic acid) (FR-PAA) was prepared by copolymerization of N-(2-(5,5-dimethyl-1,3,2- dioxaphosphinyl-2-ylamino)- ethylacetamide-2-propenyl acid (DPEPA) and acrylic acid and used to fabricate various FR-PAA/ montmorillonite (MMT) thin films via layer-by-layer (LbL) deposition as a flame-retardant coating system for cotton fabric. Thermogravimetric analysis (TGA) indicated that treatment of FR-PAA/MMT thin films improved the thermal stability of cotton fabric. Cone calorimeter testing showed that the cotton fabrics coated with the FR-PAA/MMT thin films had less flammability with lower peak heat release rate (PHRR), lower total heat release (THR), and lower average mass loss rate (AMLR). In addition, scanning electronic microscopy (SEM) demonstrated that the surface of the fabrics coated with FR-PAA/ MMT films after combustion was covered by a layer of continuous and compact char. © 2012 American Chemical Society.


Lin K.,Zhejiang University of Technology | Ding J.,Zhejiang University of Technology | Huang X.,Zhejiang University of Technology
Industrial and Engineering Chemistry Research | Year: 2012

Tetrabromobisphenol A (TBBPA) is one of the most widely used brominated flame retardants and is ubiquitously present in the environment. In this study, we investigated the debromination of TBBPA by nanoscale zerovalent iron (nZVI) in methanol/water (50/50) solutions. Zerovalent iron nanoparticles demonstrated an excellent capacity to debrominate TBBPA to tribromobisphenol A, dibromobisphenol A, bromobisphenol A, and bisphenol A. More than 86% of TBBPA was debrominated within 16 h in a pH 7.5 reaction solution initially containing 3.0 g/L of nZVI. Debromination of TBBPA was apparently accompanied by the release of bromine ions and the elevation of solution pH. The debromination kinetics could be well-described by a three-parameter pseudo-first-order decay model. A higher loading of nZVI and acidic conditions facilitated the debromination process, while coexisting Ca 2+ and Na + species inhibited the reaction. On the basis of identified reaction intermediates and products, TBBPA debromination pathways by nZVI were proposed. This study suggests that nZVI may be potentially employed to debrominate TBBPA in soil and sediment. © 2012 American Chemical Society.


Xiao J.,Nankai University | Cheng Z.,Zhejiang University of Technology
Journal of Computational and Theoretical Nanoscience | Year: 2013

In DNA computing and DNA nanotechnology, the DNA encoding is one of the most practical and important research topics. DNA encoding need meet simultaneously several physical, chemical and logical constraints, which has been proved to be an NP-hard problem. In the paper, a multi-swarm particle swarm optimization is proposed to deal with DNA encodings problem. The method proposed used the local PSO with the time-varying acceleration coefficients (TVAC) as the search engine for each sub-swarms, and incorporated the differential evolution to improve the swarm search space. The results of simulation experiments show that the proposed algorithm is valid and outperforms other evolutionary algorithms. Copyright © 2013 American Scientific Publishers All rights reserved.


Gao J.,Zhejiang University of Technology | Jin Z.,Zhejiang University of Technology | Pan Z.,Zhejiang University of Technology
Polymer Degradation and Stability | Year: 2012

Poly(trimethylene terephthalate) (PTT) was depolymerized in hot compressed water (HCW) using a fused-silica capillary reactor (FSCR) and a batch-type autoclave reactor. The phase behavior of PTT in water during the heating, reaction, and cooling processes was observed in an FSCR with a microscope and recorded by a digital camera. It was found that PTT can dissolve in water in a temperature range of 240-320°C and form a homogeneous aqueous solution. The effects of the reaction temperature (240-320°C) and reaction time (5-60 min) were evaluated in a batch-type autoclave reactor. The main depolymerization products of PTT were terephthalic acid (TPA) and 1,3-propanediol (1,3-PDO), which were identied by liquid chromatography mass spectrometry, Fourier-transform infrared spectroscopy, gas chromatography mass spectrometry, Raman spectroscopy, and quantied by high-performance liquid chromatography as well as gas chromatography. Additionally, it was found that 1,3-PDO was converted to 1,5-dioxocane partly in the presence of TPA. Under optimal reaction conditions, i.e. 300°C, 15 min, with a water/PTT ratio of 8:1 (w/w), complete depolymerization was achieved, and the yields of TPA and 1,3-PDO reached 90.5% and 69.03%, respectively. Based on the results, a reaction mechanism for PTT depolymerization in HCW was proposed. © 2012 Elsevier Ltd. All rights reserved.


Wu H.,Zhejiang University of Technology | Xu B.,Zhejiang University of Technology | Liu A.,Zhejiang Sci-Tech University | Chai G.,Zhejiang University of Technology
Journal of Physics D: Applied Physics | Year: 2012

The strain-mediated magnetocapacitance (MC) of 1-3-type vertical ferroelectric-ferromagnetic nanocomposite films epitaxially grown on different cubic substrates is theoretically calculated using the nonlinear thermodynamic theory combined with elastic theory. The dependences of relative dielectric constant and strain sensitivity of permittivity for the ferroelectric film on the in-plane and out-of-plane misfit strains are obtained. Our results show that the MC effect strongly depends on the in-plane misfit strain and ferromagnetic volume fraction in the nanocomposite films. The calculated MC for the BaTiO 3-CoFe 2O 4 nanocomposite film grown on the SrTiO 3 substrate is consistent with the experimental result. Furthermore, a giant MC, which is enhanced by 1-2 orders of magnitude than those reported in experiments, can be obtained for the BaTiO 3-CoFe 2O 4 system grown on the MgO substrate near the transition from the aa-phase to the r-phase. Our result provides a new method for the design of multiferroic nanocomposites with colossal MC effect by optimizing the ferromagnetic phase and substrate types to realize their applications in magnetic-field-controlled electric devices, such as magneto-oscillators, magnetovaractors and magnetoelectric sensors. © 2012 IOP Publishing Ltd.


Deng D.,Zhejiang University of Technology | Cui Y.,Zhejiang University of Technology | Chen D.,Zhejiang University of Technology | Ai N.,Zhejiang University of Technology
Journal of Chemical Thermodynamics | Year: 2013

Several hydrophilic amide-based Bronsted acidic ionic liquids (BAILs) were prepared by simple acid-base neutralization reaction of N,N-dimethylformamide (DMF), N,N-dimethylacetamide (DMAc), and N-methylpyrrolidone (NMP) with trifluoroacetic acid (TFA) or tetrafluoroboric acid (FBA). The solubility data of CO2 in these BAILs were determined at T = (303.15, 313.15, and 323.15) K and subatmospheric pressure using isochoric saturation method. With the same cation, CO2 solubility in TFA-based BAILs was higher than that in FBA-based ones. From the variation of solubility, expressed as Henry's law constants, with temperature, the standard Gibbs free energy, enthalpy, and entropy changes of CO2 solvation were calculated. The solubilities of CO2 in these BAILs were apparently increased with increasing the molar volume of BAIL except for [DMFH][TFA]. © 2012 Elsevier Ltd. All rights reserved.


Wu X.,Zhejiang University of Technology | Wang Y.,Zhejiang University of Technology | Xu L.,Zhejiang University of Technology | Lv L.,Zhejiang University of Technology
Desalination | Year: 2010

The adsorption properties of calcined layered double hydroxide (denoted as CLDH) for perchlorate (ClO4 -) pollutant from aqueous solution were examined in batch and column model. The influences of chemical composition of adsorbents, adsorbent dose, and co-existing anions on the perchlorate removal in batch model have been investigated. The maximum uptake capacity was obtained at a calcined temperature of 500°C with Zn/Al ratio of 2. The Freundlich isotherm and Langmuir isotherm were used to fit the data of equilibrium experiments. The removal of perchlorate ion is best represented by the Freundlich curve than that of the Langmuir. Free energy (ΔG0=-1.4kJ/mol), calculated from Freundlich constants, indicated the spontaneity of the uptake process. The adsorption process was found to be endothermic and followed the modified multiplex kinetic model. The calculated values of Ea1 and Ea2 are 11.66 and 30.13kJ/mol respectively, indicating that the rapid step of the uptake process is controlled by diffusion, and the slow step is controlled by the reaction of perchlorate with the CLDH rather than by diffusion. The effect of flow rate on the column behavior was also studied. Increasing the residence time in the column could enhance the sorption capacity of the bed and its efficiency. © 2010 Elsevier B.V.


Huang F.,Zhejiang University of Technology | Huang Y.,Zhejiang University of Technology | Pan Z.,Zhejiang University of Technology
Industrial and Engineering Chemistry Research | Year: 2012

Depolymerization of polyimide synthesized from 4,4′-oxidiphthalic anhydride and 4,4′-diaminodiphenyl ether monomers (ODPA/ODA PI) in hot compressed water was carried out in a fused silica capillary reactor (FSCR) and batch autoclave reactor system. The phase behavior of ODPA/ODA PI in water during the heating, reaction, and cooling stages of the process in FSCR was observed with an image recording system from under the microscope. The effects of temperature (320-350 °C) and reaction time (30-90 min) on the depolymerization yield and products yields in batch autoclave reactor were investigated at a fixed H 2O/PI ratio, and optimal conditions were established. Additionally, an understanding of the reaction pathway of ODPA/ODA PI depolymerization in hot compressed water was developed. © 2012 American Chemical Society.


Liu Y.,Zhejiang University of Technology | Gao Z.,Zhejiang University of Technology | Li P.,Zhejiang University | Wang H.,China University of Petroleum - East China
Industrial and Engineering Chemistry Research | Year: 2012

An efficient nonlinear just-in-time learning (JITL) soft sensor method for online modeling of batch processes with uneven operating durations is proposed. A recursive least-squares support vector regression (RLSSVR) approach is combined with the JITL manner to model the nonlinearity of batch processes. The similarity between the query sample and the most relevant samples, including the weight of similarity and the size of the relevant set, can be chosen using a presented cumulative similarity factor. Then, the kernel parameters of the developed JITL-RLSSVR model structure can be determined adaptively using an efficient cross-validation strategy with low computational load. The soft sensor implement algorithm for batch processes is also developed. Both the batch-to-batch similarity and variation characteristics are taken into consideration to make the modeling procedure more practical. The superiority of the proposed soft sensor approach is demonstrated by predicting the concentrations of the active biomass and recombinant protein in the streptokinase fed-batch fermentation process, compared with other existing JITL-based and global soft sensors. © 2012 American Chemical Society.


Xiong Y.,Zhejiang University of Technology | Yu Q.,University of Nevada, Reno | Jiang Y.,University of Nevada, Reno
Materials Science and Engineering A | Year: 2012

Multiaxial fatigue behavior of extruded AZ31B magnesium alloy was experimentally studied in ambient air under strain-controlled axial-torsion loading using tubular specimens. Four fully reversed loading paths were employed: tension-compression, pure torsion, proportional axial-torsion, and 90° out-of-phase nonproportional axial-torsion. Tension-compression asymmetry in cyclic plastic deformation was observed for tension-compression and combined axial-torsion loading. For the same equivalent strain amplitude, the 90° out-of-phase nonproportional loading path resulted in the shortest fatigue life and the proportional loading path produced the longest fatigue life. Two critical plane multiaxial fatigue models, namely, the modified Smith-Watson-Topper (SWT) model and the Jiang multiaxial fatigue criterion, were evaluated based on the experimentally obtained fatigue results. Both models were found to be able to correlate the fatigue experiments reasonably well. © 2012 Elsevier B.V.


Chen L.J.,Zhejiang University of Technology | Wu F.Q.,Intertek
Surface Engineering | Year: 2012

The novel fluorinated polyacrylate latex was successfully prepared by emulsion polymerisation of perfluorononylene allyl ether (PFAE) with butyl acrylate (BA) and methyl methacrylate (MMA) initiated by potassium persulphate (KPS) in the water with different surfactants. PFAE was synthesised from the intermediate perfluoro nonene and 3-allyl alcohol as staring reactants. Films of the novel fluorinated polyacrylate latex were prepared by coating the latex directly on the clean glass sheet and allowed to dry at 80°C in a bake oven. The structure of the novel fluorinated polyacrylate latex was investigated by Fourier transform infrared spectrometry. Surface difference of novel fluorinated polyacrylate latex prepared with different surfactants was studied. Results show that the latex prepared with sodium dodecyl benzene sulphonate surfactant has smaller particle size, contact angle and lower surface tension. The latex prepared with sodium 2-hydroxy-3-(methacryloyloxy) propane-1-sulphonate surfactant has larger particle size, higher surface tension and larger contact angle. © 2012 Institute of Materials, Minerals and Mining.


Jia Y.B.,Zhejiang University of Technology | Zhuang G.L.,Zhejiang University of Technology | Wang J.G.,Zhejiang University of Technology
Journal of Physics D: Applied Physics | Year: 2012

Finding an effective strategy for detecting SO 2 gas is very important in order to solve the problem of pollution of SO 2. Based on the first-principles density functional theory (DFT) calculations, we herein explore the possibility of using (5, 5) silicon carbide nanotubes (SiCNTs) with an external electric field (EF) as a potential gas sensor for SO 2 detection. It is found that SO 2 molecules can be chemisorbed to the SiC bonds of SiCNTs and can generate a different charge distribution under the EF, resulting in the breaking of some SC bonds. It is these broken SC bonds that induce a decrease in the band gap. Furthermore, with the concentration of SO 2 exceeding 20%, the band gap of SiCNT under an EF of 9.00Vnm 1 would be reduced from 1.75eV for SiCNT to zero, indicating the transformation from a semiconductor to a conductor. Hence, with an appropriate EF, SiCNTs can effectively respond to SO 2 and serve as sensors for detecting SO 2 gas. © 2012 IOP Publishing Ltd.


He J.-Z.,Zhejiang University of Technology | Ru Q.-M.,Zhejiang University of Technology | Dong D.-D.,Zhejiang University of Technology | Sun P.-L.,Zhejiang University of Technology
Molecules | Year: 2012

Four crude water soluble polysaccharides, CABP, CAAP, CFVP and CLDP,were isolated from common edible mushrooms, including Agaricus bisporus, Auricularia auricula, Flammulina velutipes and Lentinus edodes, and their chemical characteristics and antioxidant properties were determined. Fourier Transform-infrared analysis showed that the four crude polysaccharides were all composed of β-glycoside linkages. The major monosaccharide compositions were D-galactose, D-glucose and D-mannose for CABP, CAAP and CLDP, while CFVP was found to consist of L-arabinose, D-galactose, D-glucose and D-mannose. The main molecular weight distributions of CABP and the other three polysaccharides were <5.1 × 10 4 Da and >66.0 × 10 4 Da, respectively. Antioxidant properties of the four polysaccharides were evaluated in in vitro systems and CABP showed the best antioxidant properties. The studied mushroom species could potentially be used in part of well-balanced diets and as a source of antioxidant compounds. © 2012 by the authors.


Gao Z.,Zhejiang University of Technology | Qiu B.,Zhejiang University of Technology | Wang X.,Zhejiang University of Technology | Jiang Y.,University of Nevada, Reno
International Journal of Fatigue | Year: 2010

Based on the tension-compression, torsion, and axial-torsion fatigue experiments conducted on notched shaft specimens made of 16MnR steel, local stress fatigue life prediction approaches were evaluated. The cyclic elastic-plastic deformation of the material at the notch was analyzed using the finite element (FE) method and approximate methods. Two critical plane multiaxial fatigue criteria were used to predict the fatigue lives. The predicted fatigue lives based on the FE stress analysis agree well with the experimental observations and predictions made using the local stress-strain results obtained from the approximate methods do not agree well with the experimental results. © 2010 Elsevier Ltd. All rights reserved.


Su L.,Nankai University | Su L.,Zhejiang University of Technology | Zhong Y.,Nankai University | Zhou Z.,Nankai University
Journal of Materials Chemistry A | Year: 2013

The conversion reaction mechanism has widely been accepted in interpreting and evaluating the lithium storage capability of transition metal oxides (MOs). However, this mechanism cannot well explain the phenomenon of the extra capacity which exists in almost all MO materials and attracts much attention. Up to now, the extra capacity phenomenon has generally been ascribed to the reversible conversion of polymeric gel-like films. However, the essential role of metal nanoparticles in this process has not been systematically investigated. To further illustrate the role of metal nanoparticles for the extra capacity, Fe3O4@C and Fe@C monodispersed hierarchical core-shell microspheres were designed and adopted as the case study. Naturally Fe 3O4@C composites exhibited a large Li storage capacity beyond its theoretical value. However, Fe@C microspheres, which are usually regarded to be inert for lithium storage, still presented a certain electrochemical capacity. Fe nanoparticles might serve as electrocatalysts for the reversible conversion of some components of solid electrolyte interface films, and bring extra capacity to Fe3O4 and electrochemical capacity to Fe. This study can enlighten us for the exploiting of advanced active materials and electrolytes for Li ion batteries, and new energy storage devices. © 2013 The Royal Society of Chemistry.


Jin X.,Zhejiang University of Technology
2011 International Conference on Computer Science and Service System, CSSS 2011 - Proceedings | Year: 2011

Watermarking provides an efficient method for copyright protection. This paper discusses the digital watermark technology which is based on Arnold and wavelet transform. After the Arnold transform of embedded watermark information, then embeds it into host gray images with discrete wavelet transform. Emulational experiments are done in Matlab, Experimental results demonstrate that this watermarking algorithms have better effect: The watermark is invisible and robust against kinds of classical attacks. © 2011 IEEE.


Qiu Z.,Zhejiang University of Technology | Huang H.,Zhejiang University of Technology | Du J.,Zhejiang University of Technology | Feng T.,Zhejiang University of Technology | And 3 more authors.
Journal of Physical Chemistry C | Year: 2013

NbC nanowires (NWs) have been successfully synthesized by a bamboo-based carbon-thermal method and used as potential platinum catalyst support for direct methanol fuel cells (DMFCs). The NbC NWs show a highly oriented growth behavior, high electrical conductivity, and outstanding oxidation resistance. Well-deposited platinum (Pt) nanoparticles with the average size of about 6 nm were highly dispersed on the surface of the NbC NWs via sodium borohydride reduction method. Compared with conventional Pt/C (Vulcan XC-72) catalyst, the Pt/NbC NWs catalyst presented a distinctly enhanced methanol oxidation reaction (MOR) by a negative shift in the onset potential and an increase of the peak current density. Meanwhile, the Pt/NbC NW catalyst showed excellent electrochemical stability, which could be attributed to little change of electrochemical surface area during methanol oxidation. On the basis of these intrinsic properties and one-dimensional nanoarchitecture, the NbC NWs will be attractive as a promising catalyst support in DMFCs. © 2013 American Chemical Society.


Cai Q.,Zhejiang University of Technology | Wang X.,Zhejiang University of Technology | Wang J.-G.,Zhejiang University of Technology
Journal of Physical Chemistry C | Year: 2013

Distinctions between supported Au and Pt catalysts on TiO2(110) for CO oxidation have been investigated by means of density functional theory calculations. Our study shows that the following factors determine the obvious differences between two kinds of catalysts for CO oxidation: (1) The adsorption strength of Au11 is much weaker than that of Pt11 on TiO2(110), but both are strongly dependent on the surface properties of TiO2. The addition of Pt increases the interaction between the alloyed cluster and TiO2 support. (2) O2 can adsorb only on the interfacial site between Au and TiO2(110), whereas O 2 can adsorb on both the interfacial and metal sites of supported Pt nanoparticles. (3) CO is directly activated by the adsorbed molecular oxygen on the interfacial site of Au11/TiO2(110)-OH. While on Pt11/TiO2(110)-OH, the main reaction pathway is the dissociated oxygen reacting with CO. Once a Pt ensemble is formed on Au clusters (such as Au8Pt3/TiO2(110)-OH), both of the reaction mechanisms work. © 2013 American Chemical Society.


Gong X.,Zhejiang University of Technology
Physical Chemistry Chemical Physics | Year: 2013

The control of surface properties such as the morphology, roughness, stiffness, and wettability of polyelectrolyte multilayers was carried out using poly(diallyldimethylammonium chloride) (PDADMAC) and poly(4-styrenesulfonic acid-co-maleic acid, 1 : 1 SS : MA) sodium salt (PSSMA 1 : 1) as the building blocks via adjusting the assembly pH value. We found that the surface roughness of the multilayers increased with increasing assembly pH value, and that the morphology was quite different at various assembly pH values when PSSMA was assembled as the final layer. However, the surface roughness and morphology of the multilayers (PDADMAC as the final layer) showed no apparent change at various assembly pH values. Interestingly, the stiffness of the PSSMA/PDADMAC multilayers could be tuned. Nanoindentation measurements by SFM showed that the hardness of the multilayers was very different at various pH values when PSSMA was the outermost layer. Conversely, the hardness of the multilayers remained unchanged regardless of the pH when PDADMAC was the outermost layer. The water contact angle hysteresis (the difference between the advancing and receding contact angles) of the multilayers was largely affected by both surface roughness and surface hydrophilic groups which could also be tuned by assembly pH. © 2013 the Owner Societies.


Huang G.,Taizhou University | Yang J.,Taizhou University | Wang X.,Zhejiang University of Technology | Gao J.,Zhejiang University of Technology | Liang H.,Taizhou University
Journal of Materials Chemistry A | Year: 2013

A novel phosphorus-nitrogen containing dendrimer DPC-PAMAM has been obtained by the functionalization of amine terminated poly(amidoamine) (PAMAM) with diphenyl phosphoryl chloride (DPC), which is used to modify polyurethane (PU) as an intumescent flame retardant. The gel-phase network, made up of a number of nanofibers, is formed by the self-assembly of DPC-PAMAM dendrimer, which is embedded in the PU matrix by in situ polymerization. The results from thermogravimetric analysis (TGA) and cone calorimeter testing indicate that the addition of the DPC-PAMAM gelator improves thermal stability and reduces significantly the flammability (including peak heat release rate (PHRR), total heat release (THR), average mass loss rate (AMLR), etc.) of PU resin. Furthermore, incorporating the DPC-PAMAM gelator into the polymer matrix enhances the strength of PU resin. The scanning electron microscopy (SEM) images show that a compact and dense intumescent char is formed for PU composites filled with DPC-PAMAM after combustion, which results in the improvement of flame-retardant properties of the polymer matrix by condensed phase flame retardancy. © 2013 The Royal Society of Chemistry.


Huang H.,Zhejiang University of Technology | Fang J.,Zhejiang University of Technology | Xia Y.,Zhejiang University of Technology | Tao X.,Zhejiang University of Technology | And 4 more authors.
Journal of Materials Chemistry A | Year: 2013

TiO2(B) is considered as a new kind of anode material, and an alternative to graphite, for high-power lithium ion batteries (LIBs) due to its characteristic pseudocapacitive energy storage mechanism. Herein, we firstly report the synthesis of one-dimensional (1D) mesoporous TiO2(B) nanobelts by hydrothermal treatment of commercial TiO2 (P25) powders in NaOH medium. The as-prepared TiO2(B) nanobelts, with typical sizes of 50-100 nm in width and several micrometers in length, have mesopore channels in the range of 10-30 nm. Moreover, we demonstrate the use of graphene as an excellent mini-current collector to in situ construct unique hybrid sheet-belt nanostructures (G-TiO2(B)) to optimize the performance. Such a 1D mesoporous TiO2(B) structure can provide numerous open channels for the electrolyte to access and facilitate the ultrafast diffusion of lithium ions. In addition, the introduced graphene layers will both be favorable for the fast electron transport in the electrode and make a great contribution to the specific capacity. As a consequence, this G-TiO2(B) hybrid can deliver an ultrahigh reversible capacity (over 430 mA h g-1 at a low current density of 0.15 A g-1), and present a superior rate capability (210 mA h g-1 at 3 A g-1). © 2013 The Royal Society of Chemistry.


Liu X.,Zhejiang University of Technology | Lu M.,Zhejiang University of Technology | Ai N.,Zhejiang University of Technology | Yu F.,Zhejiang University of Technology | Ji J.,Zhejiang University of Technology
Industrial Crops and Products | Year: 2012

Sweet sorghum is a high-yielding energy crop that leaves a large amount of lignocellulosic residues after the sugar fraction fermented to ethanol. Here, we developed a biphasic kinetic model for the dilute sulfuric acid-catalyzed hemicellulose hydrolysis of sweet sorghum bagasse at temperatures of 110-150°C, and we then calculated the kinetic parameters for xylose production and furfural decomposition. The results indicated that elevated reaction temperatures promote the hydrolysis of hemicellulose and the degradation of xylose. The xylose yield increased in proportion to reaction time in the initial stages and then declined due to the degradation of xylose to furfural. The pre-exponential factors for the 'easy-to-hydrolyze' fraction, the 'hard-to-hydrolyze' fraction of hemicellulose and xylose degradation were 3.53×10 6, 1.80×10 5 and 0.62min -1, respectively, and the activation energies were 60.7, 58.1 and 14.5kJ/mol, respectively. The ideal hydrolysis condition for xylose production was 140°C for 50min, under which the xylose yield reached 60% of hemicellulose weight. This xylose can be used to form bioethanol and produce further downstream products. © 2012 Elsevier B.V.


Zhang Q.,Zhejiang University of Technology | Zhang Q.,Zhejiang University | Ye J.,Zhejiang University of Technology | Chen J.,Zhejiang University of Technology | And 4 more authors.
Environmental Pollution | Year: 2014

Risk assessment of abandoned e-waste recycling areas received little attention. Herein, we report the concentrations of 16 PCBs and 7 heavy metals in soils near an abandoned e-waste recycling plant in Taizhou, China. Our data showed that levels of tri-, tetra-, penta-, hexa-PCBs were 9.01, 5.56, 12.93, 3.13 mg/kg, and Pb, Cd, Cu were 6082.9, 42.3, 2364.2 mg/kg soil. Cd was the most prevalent contaminant with Nemerow index value of 44.3. Contaminants have been transported from the abandoned site to nearby areas. The ecology risk assessment based on the high toxicological effect in Chinese hamster ovary cells and earthworms showed that both PCBs and heavy metal residue pose high risk to the ecosystem. Hazard quotient showed that Pb, Cd, Hg and Cu pose high health risks for adults and children. Our results recommended a full examination of the risk and regulatory compliance of abandoned e-waste recycling areas in the future. © 2013 Elsevier Ltd. All rights reserved.


Liu X.-H.,Zhejiang University of Technology | Tan C.-X.,Zhejiang University of Technology | Weng J.-Q.,Zhejiang University of Technology
Phosphorus, Sulfur and Silicon and the Related Elements | Year: 2011

A new triazole compound, C46H46N10O 2S2, has been synthesized, and the crystal structure was determined by a single crystal X-ray diffraction study. The fungicidal activity of the title compound was determined, and the results showed that it displays moderate fungicidal activity. Supplemental materials are available for this article. Go to the publisher's online edition of Phosphorus, Sulfur, and Silicon and the Related Elements to view the free supplemental file. Copyright © Taylor & Francis Group, LLC.