Shanghai, China
Shanghai, China

Donghua University is a public research university in Shanghai, China. Established in 1951, it is a member of China's Project 211 group of national key universities, with a heavy focus on high level technological and scientific research. Among its various departments it is especially well known for engineering, business, and textile design, among which its fashion design, textile engineering, international trade, material science, and information technology departments have been consistently ranked highly in China for decades. Wikipedia.


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Zhang J.,Zhongyuan University of Technology | Zhang J.,Donghua University
Nonlinearity | Year: 2017

In this paper, we study a large time behavior of the global spherically or cylindrically symmetric solutions in H 1 for the compressible viscous radiative and reactive gas in multi-dimension with large initial data. Precisely, if the initial data are spherically symmetric or cylindrically symmetric, the smallness of initial data is not needed. The main concern of the present paper is to investigate the exponential stability of a solution toward the stationary solution as time goes to infinity. We obtain the uniform positive lower and upper bounds of the density by using different methods. © 2017 IOP Publishing Ltd & London Mathematical Society.


Zeng X.,Donghua University | Peng Y.,Donghua University | Lang H.,Donghua University
Carbon | Year: 2017

Graphene as a well-known solid lubricant is widely used in micro- and nano-scale mechanical devices, decreasing the friction of graphene as far as possible is a perpetual task to improve the performance of these devices. A novel approach was proposed to decrease the friction of graphene against atomic force microscopy (AFM) tip by plasma treatment of the substrate. The plasma treatment of the substrate enhances the adhesive attraction between graphene and SiO2 substrate by generating stronger van der Waals attraction. Enhancing the adhesive attraction can indeed decrease the friction of graphene, regardless of the thickness of graphene and the kinds of AFM tip. Longer time of plasma treatment results in stronger adhesive attraction, leads to smaller friction. The decreased friction is mainly due to the combined action of the suppressed puckering of graphene and the reduced ability of graphene to adjust its atomic configuration. This novel approach will promote the engineering application of graphene and other related 2D materials as lubricants in MEMS/NEMS. © 2017


Song K.,Donghua University | Song K.,University of Nebraska - Lincoln | Xu H.,University of Nebraska - Lincoln | Xu L.,University of Nebraska - Lincoln | And 2 more authors.
Bioresource Technology | Year: 2017

High-efficiency and recyclable three-dimensional bioadsorbents were prepared by incorporating cellulose nanocrystal (CNC) as reinforcements in keratin sponge matrix to remove dyes from aqueous solution. Adsorption performance of dyes by CNC-reinforced keratin bioadsorbent was improved significantly as a result of adding CNC as filler. Batch adsorption results showed that the adsorption capacities for Reactive Black 5 and Direct Red 80 by the bioadsorbent were 1201 and 1070 mg g−1, respectively. The isotherms and kinetics for adsorption of both dyes on bioadsorbent followed the Langmuir isotherm model and pseudo-second order model, respectively. Desorption and regeneration experiments showed that the removal efficiencies of the bioadsorbent for both dyes could remain above 80% at the fifth recycling cycles. Moreover, the bioadsorbent possessed excellent packed-bed column operation performance. Those results suggested that the adsorbent could be considered as a high-performance and promising candidate for dye wastewater treatment. © 2017 Elsevier Ltd


Wang P.H.,Donghua University
Environmental Engineering and Computer Application - Proceedings of the International Conference on Environmental Engineering and Computer Application, ICEECA 2014 | Year: 2015

The Internet-based finance is a new model of finance featuring the combination of the Internet and finance. With the help of the Internet and big data technology, Internet companies can reduce the cost in financial transactions, alleviate information asymmetry, and extend the scope and duration of financial transactions. This paper deals with the impact of Internet-based finance on traditional financing, especially the banking industry, and by analyzing their respective advantages and disadvantages, proposes three business models for the banking industry in response to the challenges from the Internet-based financing. © 2015 Taylor & Francis Group, London.


Wan Y.,Donghua University | Zhou X.,Donghua University
RSC Advances | Year: 2017

Hafnium oxide nanoparticles (NPs) were synthesized by a hydrothermal route, using hafnium tetrachloride (HfCl4) as the starting material and sodium hydroxide (NaOH) to adjust the pH. Through changing the aging temperature, concentration of NaOH and reaction time, both pure tetragonal hafnium oxide (t-HfO2) and pure monoclinic hafnium oxide (m-HfO2) were obtained. X-ray diffraction (XRD) spectra and transmission electron microscopy (TEM) images indicated that the shapes of t-HfO2 NPs and m-HfO2 NPs were near-spherical and spindle-like, respectively. The formation of t-HfO2 NPs or m-HfO2 NPs is probably related to their crystal cell structure, thermodynamic and kinetic stabilities. Tetragonal HfO2 is produced originally in the process of the formation of monoclinic HfO2. A higher temperature, lower concentration of NaOH, longer reaction time and addition of m-HfO2 seeds are beneficial for the formation of m-HfO2 NPs. By analysis and calculation of the equilibrium constants involving hydrolysis of hafnium ions, the changes in the mole fractions of hafnium hydro-complexes with pH were determined. The Hf(OH)6 2− ion is assigned to the precursory hydro-complex for the formation of HfO2 nanoparticles transformed from Hf(OH)4 gel according to a comparison between the influences of pH on the equilibrium and the formation of HfO2 particles. Moreover, the formation of HfO2 NPs was obviously promoted and the size was reduced by addition of seeds, suggesting that the formation of HfO2 NPs is controlled by the surface-deposition reaction. The above results are of great importance for studying nano-inorganic solution chemistry. © The Royal Society of Chemistry.


Xu D.,Donghua University | Zheng X.,Donghua University | Xiao R.,Donghua University
RSC Advances | Year: 2017

A polyethylene-co-polyvinyl alcohol (EVOH) nanofiber membrane was prepared by the melt blending extrusion and high-speed airflow deposition process. Then nano cellulose crystal/polyethylene-co-polyvinyl alcohol (NCC/EVOH) nanofiber composite membranes were obtained via coating and depositing the barrier layer on the surface of the nanofiber membrane. The basic structural properties and oil-water separation performance of the composite membranes were investigated. The results show that the deposited NCC formed a dense layer in the surface of the nanofiber membrane with smaller pore size, and had no effect on the continuous pore structure of the membrane. With increasing NCC content, the composite membranes showed an increase of tensile strength (from 9.969 MPa to 12.991 MPa) and a decrease of contact angle, pore size, and water flux. The water flux and the filtration flux of the composite membrane can be improved within a certain range by increasing the operating pressure. The NCC/EVOH nanofiber composite membranes were successfully applied for the separation of oil-water emulsion and exhibited a higher rejection rate (99.5%). Moreover, the NCC/EVOH nanofiber composite membranes possessed a higher recovery rate of filtration flux than unmodified EVOH nanofiber membranes and the commercial micro-filtration membranes. © 2017 The Royal Society of Chemistry.


Wang Y.,Donghua University | Liu D.,Donghua University
Chemistry Letters | Year: 2016

Mesoporous zeolites were synthesized by a new organosilane template with double-oxycarbonyl carbon chains. The structure of the zeolite crystals was confirmed by scanning electron microscopy (SEM), transmission electron microscopy (TEM), nitrogen adsorption-desorption measurements, and X-ray diffraction (XRD), which showed that their structure has the same characteristics as ZSM-5 zeolites, and there were about 4 nm mesopores in the acquired zeolites. © 2016 The Chemical Society of Japan.


Kuppan S.,Lawrence Berkeley National Laboratory | Xu Y.,SLAC | Xu Y.,Donghua University | Liu Y.,SLAC | Chen G.,Lawrence Berkeley National Laboratory
Nature Communications | Year: 2017

Understanding the reaction pathway and kinetics of solid-state phase transformation is critical in designing advanced electrode materials with better performance and stability. Despite the first-order phase transition with a large lattice mismatch between the involved phases, spinel LiMn 1.5 Ni 0.5 O 4 is capable of fast rate even at large particle size, presenting an enigma yet to be understood. The present study uses advanced two-dimensional and three-dimensional nano-Tomography on a series of well-formed Li x Mn 1.5 Ni 0.5 O 4 (0≤x≤1) crystals to visualize the mesoscale phase distribution, as a function of Li content at the sub-particle level. Inhomogeneity along with the coexistence of Li-rich and Li-poor phases are broadly observed on partially delithiated crystals, providing direct evidence for a concurrent nucleation and growth process instead of a shrinking-core or a particle-by-particle process. Superior kinetics of (100) facets at the vertices of truncated octahedral particles promote preferential delithiation, whereas the observation of strain-induced cracking suggests mechanical degradation in the material. © 2017 The Author(s).


Zhou H.,Donghua University | Hu D.,Donghua University | Gu B.,Donghua University | Sun B.,Donghua University
Composite Structures | Year: 2017

The transverse impact performance of three dimensional (3-D) braided composite tubes has been studied both experimentally and numerically. Three types of braided composite tubes were manufactured by changing the number of braiding layers. The transverse impact test was performed on a modified split Hopkinson pressure bar (SHPB) apparatus under three impact gas pressures. From the tests, impact load, displacement and energy absorbed all increase with the increase of gas pressure. The increase of braiding layers leads to the increase of the impact load and energy absorption, but leads to the decrease of impact displacement. The specific load normalized by the linear density of the tubes also increases with the increment of braiding layers. The results indicated that more braiding layers contributed to higher stiffness. The impact damage modes were matrix crack, fiber breakage and shear bands at the area of impact. From the finite element method (FEM), the stress distribution on the impacted tube was highlighted plus the damage progression during the transverse impact cycles. © 2017 Elsevier Ltd


Lu T.,Donghua University | Chang S.,Donghua University | Liu G.,Donghua University
Communications in Computer and Information Science | Year: 2017

Delay-constrained least-energy-consumption multicast tree construction is an important problem in wireless ad hoc networks and sensor networks to support multimedia applications such as audio and video. In the past few years, delay-constrained least-cost multicast tree construction had received much attention. However, these algorithms in wired networks cannot be directly used in wireless networks, because energy consumption are not considered in protocol design. In this paper, we focus on the problem of delay-constrained least-energy-consumption multicast routing in unreliable wireless multi-hop networks. Link error rate is considered in the process of multicast tree construction. We proposed a heuristic genetic algorithm to solve the problem. Simulations are performed to demonstrate the effectiveness and efficiency of the proposed algorithm. © Springer Nature Singapore Pte Ltd. 2017.


Yan C.,Donghua University | Zhao X.,Donghua University | Zhang Q.,Donghua University | Huang Y.,Donghua University
PLoS ONE | Year: 2017

In big data area a significant challenge about string similarity join is to find all similar pairs more efficiently. In this paper, we propose a parallel processing framework for efficient string similarity join. First, the input is split into some disjoint small subsets according to the joint frequency distribution and the interval distribution of strings. Then the filter-verification strategy is adopted in the computation of string similarity for each subset so that the number of candidate pairs is reduced before an effective pruning strategy is used to improve the performance. Finally, the operation of string join is executed in parallel. Para-Join algorithm based on the multi-threading technique is proposed to implement the framework in a multi-core system while Pada-Join algorithm based on Spark platform is proposed to implement the framework in a cluster system. We prove that Para-Join and Pada-Join cannot only avoid reduplicate computation but also ensure the completeness of the result. Experimental results show that Para-Join can achieve high efficiency and significantly outperform than state-of-the-art approaches, meanwhile, Pada-Join can work on large datasets. © 2017 Yan et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


Li X.,Donghua University | Shi C.-H.,Donghua University | Tang C.-L.,Donghua University | Cai Y.-M.,Donghua University | Meng Q.,Donghua University
Biology Open | Year: 2017

Spider silk is an attractive biopolymer with numerous potential applications due to its remarkable characteristics. Among the six categories of spider silks, flagelliform (Flag) spider silk possesses longer and more repetitive core domains than others, therefore performing the highest extensibility. To investigate the correlation between the recombinant spidroin size and the synthetic fiber properties, four recombinant proteins with different sizes [N-Scn-C (n=1-4)] were constructed and expressed using IMPACT system. Subsequently, different recombinant spidroins were spun into fibers through wet-spinning via a custom-made continuous post-drawing device. Mechanical tests of the synthetic fibers with four parameters (maximum stress, maximum extension, Young's modulus and toughness) demonstrated that the extensibility of the fibers showed a positive correlation with spidroin size, consequently resulting in the extensibility of N-Sc4-C fiber ranked the highest (58.76%) among four fibers. Raman data revealed the relationship between secondary structure content and mechanical properties. The data here provide a deeper insight into the relationship between the function and structure of Flag silk for future design of artificial fibers. © 2017. Published by The Company of Biologists Ltd.


Li J.,Donghua University | Wang S.,Donghua University | Shi X.,University of Madeira | Shen M.,Donghua University
Advances in Colloid and Interface Science | Year: 2017

The design and development of multifunctional nanoplatforms for biomedical applications still remains to be challenging. This review reports the recent advances in aqueous-phase synthesis of iron oxide nanoparticles (Fe3O4 NPs) and their composites for magnetic resonance (MR) imaging and photothermal therapy of cancer. Water dispersible and colloidally stable Fe3O4 NPs synthesized via controlled coprecipitation route, hydrothermal route and mild reduction route are introduced. Some of key strategies to improve the r2 relaxivity of Fe3O4 NPs and to enhance their uptake by cancer cells are discussed in detail. These aqueous-phase synthetic methods can also be applied to prepare Fe3O4 NP-based composites for dual-mode molecular imaging applications. More interestingly, aqueous-phase synthesized Fe3O4 NPs are able to be fabricated as multifunctional theranostic agents for multi-mode imaging and photothermal therapy of cancer. This review will provide some meaningful information for the design and development of various Fe3O4 NP-based multifunctional nanoplatforms for cancer diagnosis and therapy. © 2017 Elsevier B.V.


Sun S.,Donghua University | Gebauer D.,University of Konstanz | Colfen H.,University of Konstanz
Angewandte Chemie - International Edition | Year: 2017

Despite numerous studies on the nucleation and crystallization of iron (oxyhydr)oxides, the roles of species developing during the early stages, especially primary clusters and intermediate amorphous particles, are still poorly understood. Herein, both ligand-free and ligand-protected amorphous iron oxide (AIO) clusters (<2 nm) were synthesized as precursors for magnetite formation. Thermal annealing can crystallize the clusters into magnetite particles, and AIO bulk phases with domains of pre-aligned clusters are found to be direct precursors to crystals, suggesting a non-classical aggregation-based pathway that differs from the reported oriented attachment or particle accretion mechanisms. © 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim


Zhu Y.,Donghua University | Chen D.,Donghua University
Materials and Design | Year: 2017

Inspired by the woodpile and irregular entanglement phenomenon, attapulgite (AT)-based nanofibrous membranes (NFMs) with different poly(vinyl alcohol) (PVA) contents were fabricated via a facile method consisting of pulping, handsheet making and low temperature drying process. In this study, the dispersion state and rheological behavior of AT with different PVA contents were studied. A “woodpile” structure of AT-based NFMs was proposed and discussed. AT-based NFMs showed high porosity (above 50%), high tensile strength (12.5 MPa) and elongation at break (1.9%). Furthermore, the optimized AT-9 exhibited low pore size (around 10 nm), good hydrophilicity (contact angle, 31.3°), high pure water flux (105 L m− 2 h− 1 bar− 1) and high rejection (0.1 MPa, 99.4%) for oil/water emulsion, suggesting a promising candidate for wastewater treatment applications. This work also provides a new insight into the design and development of inorganic-based NFMs. © 2016 Elsevier Ltd


Hu J.,Shanghai Institute of Technology | Deng W.,Shanghai Institute of Technology | Deng W.,Donghua University | Chen D.,Donghua University
ACS Sustainable Chemistry and Engineering | Year: 2017

Efficient removal of dye pollutants from water is of significant importance for environmental protection; thus, the development of advanced sorbent materials with high adsorption capacity is highly desirable. Herein, we report a large-scale synthesis of ceria hollow spheres (CHS) derived from the sol-gel reaction of cerium nitrate on polymeric templates. The obtained CHS have efficient adsorption performance to acid black 210 (AB 210), with a maximum adsorption capacity of 175.75 mg g-1, which is considerably bigger than those of the previously reported ceria-based adsorbents and more than 5 times those of powdered activated carbons (PAC) and ceria nanoparticles (CNP). © 2017 American Chemical Society.


Hu L.,Donghua University | Qiu R.,Donghua University
Proceedings of the 2014 International Symposium on Information Technology, ISIT 2014 | Year: 2015

In order to improve the recognition rate of facial image under the complex illumination conditions and improve the speed of running, a novel face recognition method based on Self Quotient Image and human face priori symmetry theory is proposed. In the paper, firstly, we analyzed the Gamma transformation algorithm and applied it to improve the contrast of the image, Furthermore; we elaborated the facial symmetry theory base on parity decomposition theory and extracted the half even symmetrical facial image for face recognition system. Finally, we use a quotient image algorithm to half even face image for training and testing. The experimental results of Yale B show that the proposed method can eliminate the effects of illumination, strengthen the robustness of uneven illumination and achieved a better recognition effect. © 2015 Taylor & Francis Group, London.


Liu S.,Donghua University | Qiu R.,Donghua University
Proceedings of the 2014 International Symposium on Information Technology, ISIT 2014 | Year: 2015

According to the principle and characteristics of chaotic sequence, this paper creates a three-dimensional Rossler chaotic image encryption algorithm, which generates the initial key with the aid of the initial value and the plaintext explicitly, it will obtain iterative sequence when the initial key through the initial chaotic systems, then the original plaintext images iterative sequence encrypted with the method of diffusion and scrambling again. Simulation results and analysis show that the spread of chaos and scrambling encrypted image generated by means of this algorithm, the key space is large, low correlation of adjacent pixels, and strong anti-attack capability. The key space reaches 105 in addition to explicit self-generated key. © 2015 Taylor & Francis Group, London.


Gao S.-L.,Shanghai Urban Construction Vocational College | Fan J.-H.,Donghua University
Zhuzao/Foundry | Year: 2016

The casting industry feature of Chinese Shang and Zhou Dynasties was reviewed according to historical documents and archeological findings. From the smelting copper furnace, the alloy composition, the ceramic mould production and the casting method, the casting technique features of Chinese Shang and Zhou Dynasties were discussed. The results show that there was a large scale of bronze casting industry in Shang and Zhou Dynasties, with detailed labor division, skilled technology. At that time workers were able to choose different smelting copper furnace according to the size of bronze, found out the relationship between bronze alloy composition and mechanical properties, well mastered the mould formulation and ceramic mould making process. The one-step forming casting, compound pottery mould and connection casting were skillfully applied to the production practice. © 2016, Chinese Mechanical Engineering Society. All right reserved.


He L.,Donghua University | Xu Z.,Donghua University | Hirokawa T.,Hiroshima University | Shen L.,Donghua University
Journal of Chromatography A | Year: 2017

Biogenic amines (BAs) play significant roles in indicating human health or food quality. Aiming to simultaneously determine three structures (aliphatic, aromatic and heterocyclic) of underivatized BAs, we explored a simple and rapid capillary electrophoresis (CE) method only coupled with conventional UV detector for the separation of thirteen key BAs. The strategy is to choose a UV absorbing probe as co-ion in the background electrolyte (BGE), and different BAs could be characterized by positive or negative peaks according to the fact that their UV absorptivity coefficients at a certain wavelength are better or worse than that of the UV absorbing probe. After the detailed investigation of critical parameters as pH, the concentration of Imidazole (Im) and α-cyclodextrin (α-CD), the optimized BGE consisted of 12.0 mmol/L Im as the UV probe and 10.0 mmol/L α-CD as the additive (at pH 4.50 adjusted with acetic acid). With such condition, the targets of thirteen BAs were baseline separated in 9.0 min and appeared at nine positive peaks and four negative peaks at 200 nm. The obtained LODs and LOQs (S/N = 3 or 10) were in the range of 0.36–3.67 and 1.2–12.2 μmol/L, respectively. The interday RSDs of migration time and peak area were less than 0.7% and 4.7% (n = 6), respectively. To the best of our knowledge, this is the first report on separating diverse structures of BAs by using Im as UV absorbing probe. The thirteen BAs were simultaneously detected by direct and indirect UV detection in a CE process. To verify the applicability, this method was used to analyze BAs in commercial beer samples. The recoveries of all BAs except carnosine (not identified by the interference) ranged from 70.4 to 119.6%, and four aliphatic and aromatic amines were satisfactorily identified and quantified. © 2016 Elsevier B.V.


Zhou J.,Donghua University | Zhao R.,Donghua University
Xitong Gongcheng Lilun yu Shijian/System Engineering Theory and Practice | Year: 2016

This study investigated how two types of free-riding effects may influence quality disclosure and pricing decision in a dual-channel supply chain, consisting of an upstream manufacturer, which owns an electronic channel, and a downstream retailer. In this paper we incorporated consumer attentiveness, as well as search costs, into a model of quality disclosure, to describe end consumers' surplus of purchase and both channels' demand. Then we derived the channel's optimal pricing strategy and disclosure conditions under two free-riding formats, respectively. And the impact of consumer attentiveness, search costs and product differentiation between two channels on quality disclosure was analyzed, too. We next compared the decisions of the manufacturer and the retailer under two free-riding formats to derive the influence exerted on the point-of-sale terminal free-riding effect. Our results suggest that: when considering free-riding effect, a retailer discloses the quality to consumers if and only if the quality is appropriate and the wholesale price is sufficiently low; a retailer should disclose less quality information as the share of partially informed consumers (informed about one channel but not the other) increases, as consumer search costs increase, or as product differentiation between two channels decreases; the point-of-sale terminal free-riding effect leads to a lower incentive for information revelation; if some conditions are satisfied for consumer attentiveness, more information will be provided than that when the wholesale price free-riding effect is considered only; when the point-of-sale terminal free-riding parameter is sufficiently high, the greater it is, the more incentives a manufacture will have to induce his retailer to disclose information. © 2016, Editorial Board of Journal of Systems Engineering Society of China. All right reserved.


Guo Y.,Donghua University | Li Y.,Donghua University | Zhang Q.,Donghua University | Wang H.,Donghua University
Journal of Materials Chemistry C | Year: 2017

Inspired by the human eye, an electronic eye (e-eye) is a photodetector that senses optical signals. To solve the problems of power supply and the limitation of application only in the visible region, a self-powered, multifunctional e-eye for UV and IR light detection was developed. The e-eye harvests mechanical and thermal energy from the ambient environment by the triboelectric and thermoelectric effect to power itself. ZnO and RGO were chosen as active UV and IR photosensitive materials, respectively, and were vertically integrated into a single device with a multilayer structure. The self-powered, e-eye has good photoelectric properties. Moreover, it can distinguish UV and IR irradiation of different intensities individually or simultaneously through the generation of different electric signals, endowing the e-eye great with potential applications in portable/wearable UV and IR detection devices. © The Royal Society of Chemistry.


Liu K.,Donghua University | Zhang X.,Donghua University | Yan K.,Donghua University
Cellulose | Year: 2017

Pentaacetyl glucose (PAG) is a common and cheap intermediate and has biocompatible, nontoxic, and renewable features. PAG was investigated as a bleach activator for H2O2 in the pretreatment of gray knitting cotton fabric. The bleaching performance of the H2O2/PAG bleaching system was investigated by measuring the CIE whiteness index (WI), H2O2 decomposition rate and bursting strength. By addition of PAG, the WI and H2O2 decomposition rate increased significantly at 70 °C with little damage to the strength. The effects of temperature and pH value on WI were also considered. Due to its environmental advantages, the H2O2/PAG system showed a good applied prospect. By using benzenepentacarboxylic acid as a fluorescent probe for HO· detection, it was found that PAG could strongly promote HO· generation and that the concentration of HO· was closely related to the WI of the fabric. On this basis, a bleaching mechanism of the H2O2/PAG system was proposed. © 2017 Springer Science+Business Media Dordrecht


Pan Z.,Zhejiang Provincial Key Laboratory of Fiber Materials and Manufacturing Technology | Gu B.,Donghua University | Sun B.,Donghua University | Xiong J.,Zhejiang Provincial Key Laboratory of Fiber Materials and Manufacturing Technology
Composite Structures | Year: 2017

Progress of dynamic failure of 3-D textile structural composites have not been sufficiently studied. This work is aimed to investigate the progressive failure of 3-D braided, biaxial warp-knitted and angle-interlock woven composites by high-speed imaging system during impact loadings. Real-time images are listed frame by frame and located in stress-strain curves. There is a sharp decrease stage and a steady decrease stage in stress under catastrophic failures. These two stages reveal different damage morphologies in progressive failures. For the out-of-plane impact compression, if there is no catastrophic failure, composites get limited rebound because of structural recovery of their reinforcements. If catastrophic failure occurs, composite structures would be split. For the in-plane impact compression, the 3-D braided, biaxial warp-knitted and angle-interlock woven structures protect themselves from being thoroughly split under explosive cracks/shear/delamination failures. © 2017 Elsevier Ltd


In this article, fault diagnosis of bearing based on relevance vector machine classifier with improved binary bat algorithm is proposed, and the improved binary bat algorithm is used to select the appropriate features and kernel parameter of relevance vector machine. In the improved binary bat algorithm, the new velocities updating method of the bats is presented in order to ensure the decreasing of the probabilities of changing their position vectors' elements when the position vectors' elements of the bats are equal to the current best location's element, and the increasing of the probabilities of changing their position vectors' elements when the position vectors' elements of the bats are unequal to the current best location's element, which are helpful to strengthen the optimization ability of binary bat algorithm. The traditional relevance vector machine trained by the training samples with the unreduced features can be used to compare with the proposed improved binary bat algorithm-relevance vector machine method. The experimental results indicate that improved binary bat algorithm-relevance vector machine has a stronger fault diagnosis ability of bearing than the traditional relevance vector machine trained by the training samples with the unreduced features, and fault diagnosis of bearing based on improved binary bat algorithm-relevance vector machine is feasible. © The Author(s) 2017.


Lang H.,Donghua University | Peng Y.,Donghua University | Zeng X.,Donghua University
Applied Surface Science | Year: 2017

Atomic-scale steps generally presented in 2-dimensional materials have important influence on the overall nanotribological properties of surface. Frictional properties at atomic-scale steps of two types of 2-dimensional materials are studied using calibrated atomic force microscopy (AFM) tip sliding against the steps. The lateral force at uncovered step is larger than covered step due to the bending of step edge. The lateral force at monolayer uncovered step edge of h-BN is lower than graphene because h-BN possesses higher interlayer bonding strength than graphene and the bending of h-BN step edge is suppressed to some extent. The high uncovered step exhibits much larger lateral force than low uncovered step, which could be mainly induced by increased bending stiffness of step edge rather than increased step height. The results revealed that interlayer bonding strength and bending stiffness have great influence on the lateral force at atomic-scale steps. The studies can provide a further understanding of frictional properties at atomic scale steps and could be helpful for the applications of 2-dimensional materials as lubricant coating. © 2017 Elsevier B.V.


Wang P.,Donghua University | Cai Z.,Donghua University
Polymer Degradation and Stability | Year: 2017

A novel 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO)-based triazole compound (DTA) was prepared by reacting DOPO with imine obtained from the condensation of terephthalaldehyde with 3-amino-1H-1,2,4-triazole. Its chemical structure was characterized by FTIR, 1H NMR, 13C NMR, 31P NMR and elemental analysis. DTA was used as co-curing agent to improve the flame retardancy of epoxy resin. The thermal stabilities and flame-retardant properties of epoxy thermosets were evaluated by thermogravimetric analysis (TGA), limiting oxygen index (LOI) and UL-94 test. Moreover, the flame-retardant mechanism was investigated by FTIR, Py-GC/MS, SEM, elemental analysis and Raman spectroscopy. The results revealed that the addition of DTA resulted in the decrease of 5 wt% mass loss temperature of epoxy thermoset. With triazole ring and DOPO group in the molecular structure, DTA possessed superior flame-retardant efficiency. The thermoset modified with 4 wt% DTA achieved an LOI value of 34.8% and V-0 rating in UL-94 test, where the phosphorus content was only 0.34 wt%. Impressively, all modified thermosets showed blowing-out effect during combustion, which resulted from the concentrated release of pyrolytic gases containing phosphorus-based radicals and nonflammable gases. The flame-retardant mechanism was ascribed to the barrier effect of phosphorus-rich char layers with polyaromatic structures in the condensed phase, and quenching effect of phosphorus-based radicals and diluting effect of nonflammable gases in the gas phase. © 2017 Elsevier Ltd


Wang Q.,Donghua University | Chen S.,Donghua University | Chen D.,Donghua University
Journal of the Mechanical Behavior of Biomedical Materials | Year: 2017

The objective of current study was to prepare an injectable hydrogel with great mechanical properties and biological compatibility, which could be more suitable to be applied as tissue engineering scaffold. Chitin nano-whiskers (CNWs) were introduced into chitosan/β-glycerophosphate disodium salt (CS/GP) injectable hydrogel. The effects of CNWs contents and gelation temperatures on gelation speed and mechanical properties of the composite hydrogels were characterized and discussed. The maximum values of tensile strength and elongation at break were both more than 4 times larger than that of neat CS/GP hydrogel. The gelation time of injectable hydrogel with 5% CNWs content (formed at 37 °C) was 25 seconds, which was much shorter than that (6038 seconds) of the neat CS/GP hydrogel. In combination with results of Fourier transform infrared spectroscopy (FT-IR), it was proved that CNWs functioned as a cross-linker through hydrogen bond interaction in the gel formation process, which might be the main reason for mechanical enhancement. Meanwhile, gels formed with higher CNWs content and gelation temperature had lower equilibrium swelling ratio and drug release rate. Cytotoxicity of hydrogel in vitro was studied by MTT method with a result of indicating a good biocompatibility of CNWs enhanced hydrogel. © 2016 Elsevier Ltd


Zhang H.,Donghua University | Liu X.,Donghua University | Liu X.,Key Laboratory of Textile Science & Technology
Iranian Polymer Journal (English Edition) | Year: 2017

Photonic crystals play the vital role in structural color appearance, and they can be fabricated on polymer substrates. In this paper, monodispersed SiO2 microspheres with the average diameter ranging from 150 to 300 nm were prepared by classical Stöber method. The spherical size of SiO2 microspheres was regulated by controlling concentrations of ammonia. The tunable structural colors could be changed by modulating the diameters of SiO2 microspheres or viewing angles, which adhered to the law of the Bragg diffraction. As a kind of polymer fabric, the polyester fabrics, smoother than natural fiber fabrics, exhibited bright structural colors from the well-ordered photonic crystal microstructure by vertical deposition self-assembly of SiO2 photonic crystals. Moreover, the result indicated that the difference of fabric-woven structure could affect the lightness of structure color, and the lightness on satin fabric was duller than that of plain fabric. Besides, we have also discussed the influence of fabric structure on the lightness of structure color using the theory of thin film interference. It is believed that the structural color could provide a new strategy for related polymer product coloration without chemical dyes and pigments, and has a potential to reduce the pollution in related polymer materials dyeing and printing processes. © 2017, Iran Polymer and Petrochemical Institute.


Su Y.,Donghua University | Li J.,Donghua University | Wang Y.,Donghua University
Fibers and Polymers | Year: 2017

Hot steam from a hose spray and dew or rains directly threatens firefighter’s health and lives. The thickness of air gap between the protective clothing and the skin has an important and complicated influence on thermal protection. The purpose of this study was to examine the effect of air gap thickness on thermal protection in dry heat exposure (thermal radiation) and wet heat exposure (hot steam and thermal radiation). The results showed that the air gap between the clothing and the skin, while providing better thermal protection for dry heat exposure, also slowed down the steam transfer rate to provide heat protection. There was no critical air gap in dry and wet heat exposures. It was also found that hot steam increased sharply the heat flux absorbed by the skin, leading to the occurrence of steam burns. The increase of air gap thickness could reduce the heat flux during the exposure while no significant correlation between the air gap thickness and the final heat flux was observed during the cooling of wet heat exposure (P>0.05). © 2017, The Korean Fiber Society and Springer Science+Business Media Dordrecht.


Hao H.,Donghua University | Liu X.,Donghua University
Fibers and Polymers | Year: 2017

In this paper, thermotropic liquid-crystal microcapsules of cholesteric liquid crystal (CLC) as core material and melamine-formaldehyde (M-F) as shell material were prepared via in-situ polymerization. The core material of CLC herein was mixture of cholesteryl oleyl carbonate (COC) and cholesterol pelargonate (CPE). The optimal preparation conditions were assured based on the serial trial experiments. It was found that the prepared CLC microcapsules had spherical shape and smooth surface, and the mean particle size was about 8-10 μm. The FT-IR spectra and SEM images confirmed that the M-F shell was successfully fabricated on the surface of CLC core material. Finally, the CLC microcapsules were treated on the fabric, and the treated fabric showed color change between 33.4 °C and 38.0 °C, which is appropriate for human comfortable feeling. CIE L*a*b* values were obtained, and it confirmed the treated fabric had good color change performance. In this paper, the cholesteric liquid crystal (CLC) showed its excellent ability to change color, and the experiment result also proved that CLC microcapsules for preparing thermotropic fabric is reasonable and practicable. © 2017, The Korean Fiber Society and Springer Science+Business Media Dordrecht.


Guo S.,Hong Kong Polytechnic University | Shen B.,Donghua University | Choi T.-M.,Hong Kong Polytechnic University | Jung S.,Hong Kong Polytechnic University
Journal of Cleaner Production | Year: 2017

With the growing awareness of environmental sustainability, reverse logistics is a very timely and critical area. Traditionally, the use of supply chain contracts has been proven to be effective in enhancing the performance of logistics systems. However, the current literature on supply chain contracts in reverse logistics is scattered. As a result, we aim to review in this paper the recent state of the art literature (2006–2016) on supply chain contracts with a focus on reverse logistics systems. We explore the popularity of different kinds of supply chain contracts, and identify the most productive researchers in the area. We classify and examine the literature with respect to the supply chain structure (i.e. the involved supply chain links), and channel leaderships (i.e. who acts as the leader). Finally, we identify the research gaps, suggest five major categories of future research directions and discuss the respective research challenges. © 2016 Elsevier Ltd


Dong Q.,Donghua University | Yang C.,Donghua University | Lu Y.,Donghua University
Journal of Materials Science: Materials in Electronics | Year: 2017

An electrophoretic deposition system was used to deposit graphene oxide (GO) or alkali-functionalized GO (GONa) on the surface of graphite fiber cloth (GFC). The morphology and structure of the obtained products were examined by scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR) and Raman spectrum. The SEM images showed the GO or GONa sheets tightly covered on GFC. However, the GONa was easier to be deposited on the GFC than GO and the loading ratio could be up to 20.58 wt%. The composites showed the best electrochemical performance with specific capacitance of 27.32 F/g at 0.5 A/g when loading ratio of GONa was 8.54 wt%, synthesized at 27 V in 0.35 g/L GONa solution for 2.5 h. Moreover, the specific capacitance of the composites decreased slower with increasing current and was higher than that of the GO at 5.0 A/g. The relative specific capacitance of the GO or GONa in their composites was respectively a dozen times higher than that of the GO alone (33.39 F/g at 0.5 A/g), i.e. 427.63 F/g in GO-GFC and 355.41 F/g in GONa-GFC at 0.5 A/g. After the reduction, the specific capacitance of the reduced GO-GFC was enhanced while the reduced GO lowered, indicating that the composites prevented the most GO molecules agglomerating or restacking. © 2017 Springer Science+Business Media New York


Tang Y.,East China University of Science and Technology | Li Z.,Donghua University
2016 14th International Conference on Control, Automation, Robotics and Vision, ICARCV 2016 | Year: 2016

In this brief, a novel impulsive control has been proposed for consensus problems of discrete-time multi-agent systems. Utilizing the Lyapunov technique, a parametric discrete-time Riccati equation has been obtained in order to design impulsive controller. The derived criteria show that such impulsive control relies on the proper value of designed parameters and the upper bound of impulsive intervals. Finally, the applicability of proposed strategy is given through a numerical example. © 2016 IEEE.


Hong X.,State University of New York at Buffalo | Hong X.,Donghua University | Chung D.D.L.,State University of New York at Buffalo
Carbon | Year: 2017

This paper reports the electromagnetic interference shielding effectiveness of carbon nanofiber (CNF, originally called carbon filament) mats made from 0.16-μm-diameter catalytically grown CNFs by the paper-making process (1.7–13.1 MPa compaction pressure). These low-cost lightweight binderless mats (2.9–5.4 mm thick, 0.13–0.22 g/cm3 bulk density, 6.1–10 vol% solid) provide high shielding effectiveness (SE, 52–81 dB, 1.5 GHz) and high SE/density (370–470 dB cm3/g), though SE/thickness is low (14–18 dB/mm). Compared to the spun CNF mats of prior work, they exhibit higher SE, but lower SE/thickness. With consideration of SE, SE/thickness, and SE/density, the CNF mats are superior to graphene aerogel, reduced-graphene-oxide polyurethane foam and reduced-graphene-oxide aerogel of prior work, but are inferior to carbon nanotube mats, graphene film, carbon foam and flexible graphite of prior work. Absorption is the dominant shielding mechanism of CNF mats, so both SE and absorption loss tend to decrease with decreasing thickness. The absorption-loss/thickness tends to decrease with increasing thickness. The reflection loss is independent of the thickness, density or mass, indicating saturated reflection. The reflection-loss/density increases with decreasing density, suggesting that a higher degree of three-dimensional electrical connectivity, as provided by a lower density, enables the reflection to occur at a greater depth into the mat surface. © 2016 Elsevier Ltd


Hong X.,State University of New York at Buffalo | Hong X.,Donghua University | Yu W.,Donghua University | Chung D.D.L.,State University of New York at Buffalo
Carbon | Year: 2017

The through-thickness electric permittivity (real part) of the solid part (53 vol%) of reduced graphite oxide (RGO) paper (100–300 μm thick, prepared by hydrazine reduction of modified-Hummers-method graphite oxide, GO) is 1130 (50 Hz), which is higher than that of the similarly tested parent GO (915, 50 Hz) and other carbons (31–124, 50 Hz). The high permittivity of RGO is attributed to the defects. Due to the conductivity of RGO, an insulating film between the specimen and an electrical contact is necessary during permittivity measurement using an RLC meter. Without the film, the measured capacitance is too high by 10–11 orders of magnitude, thus resulting in incorrectly high values of the permittivity. The relative permittivity 4 × 109 (20 Hz) reported by Sarkar et al. (2016) for similarly prepared RGO is therefore incorrect. The solid part of the RGO paper exhibits at 50 Hz in-plane conductivity 31 S/m, through-thickness conductivity 1.17 S/m, through-thickness relative permittivity (imaginary part) −4.2 × 108, through-thickness dielectric loss angle 90.0°, specific capacitance of the interface with an electrical contact 0.31 μF/m2, and areal resistivity of this interface 0.18 Ω cm2. The resistivity and specific capacitance of the RGO-contact interface are lower for RGO than GO. © 2016 Elsevier Ltd


Huang H.,Donghua University | Huang H.,McGill University | Liu Q.,Huazhong Agricultural University
Fibres and Textiles in Eastern Europe | Year: 2017

Improving the accuracy of forecasting is crucial but complex in the clothing industry, especially for new products, with the lack of historical data and a wide range of factors affecting demand. Previous studies more concentrate on sales forecasting rather than demand forecasting, and the variables affecting demand remained to be optimized. In this study, a two-stage intelligent retail forecasting system is designed for new clothing products. In the first stage, demand is estimated with original sales data considering stock-out. The adaptive neuro fuzzy inference system (ANFIS) is introduced into the second stage to forecast demand. Meanwhile a data selection process is presented due to the limited data of new products. The empirical data are from a Canadian fast-fashion company. The results reveal the relationship between demand and sales, demonstrate the necessity of integrating the demand estimation process into a forecasting system, and show that the ANFIS-based forecasting system outperforms the traditional ANN technique. © 2017, Institute of Biopolymers and Chemical Fibres. All rights reserved.


Dai J.,Donghua University | Wang S.,Donghua University
Proceedings - 2016 International Conference on Cybernetics, Robotics and Control, CRC 2016 | Year: 2016

Ordinary plane existing noncircular gear algorithm has many kinds, but non-circular bevel gear because of its special structure research is not much, this paper deeply studies the similarities and differences of ordinary non-circular gear with non-circular bevel gear, a plane non-circular gear algorithm compatible approximation algorithm for non-circular bevel gear, the core idea of the algorithm is very important for the expansion of other ordinary non-circular gear. © 2016 IEEE.


Ding C.,Donghua University | Zhang T.,Donghua University
Proceedings of 2016 Prognostics and System Health Management Conference, PHM-Chengdu 2016 | Year: 2016

Intelligent monitoring is a useful method to improve the efficiency of maintenance and reduce running costs for the LED lighting system with scattered distribution and large quantity of LEDs. A simple and effective proposal is raised in this paper for LED health monitoring. Firstly, the relation curve between LED life and junction temperature is fitted out based on its parameters tested in factory. Then the relationship between junction temperature and input electric parameters is deduced by LED heating mechanism, and the mathematical model of about the two previous is established by applying BP neural network. Thus, based on the relationship between LED life and input electric parameters the intelligent monitoring system could be easy to construct. The health monitoring system is designed by applying Zigbee wireless technology, integrating the sampling circuit of the input electric parameters on LED driver, processing and analyzing the data which is sampled in the LED driver output side and then transmitted wirelessly to the PC. A principle prototype of the monitoring system is made to do experiments, and the experimental results have verified the validity and feasibility of the electric parameter sampling circuit and the ZigBee data transmission. It is proved that the method proposed can achieve the LED damage detection and predict the residual life through data analysis of input electric parameter. © 2016 IEEE.


Zheng Y.,Tsinghua University | Wang J.,Tsinghua University | Yu B.,Tsinghua University | Zhang W.,Tsinghua University | And 4 more authors.
Chemical Society Reviews | Year: 2017

High-temperature solid oxide electrolysis cells (SOECs) are advanced electrochemical energy storage and conversion devices with high conversion/energy efficiencies. They offer attractive high-temperature co-electrolysis routes that reduce extra CO2 emissions, enable large-scale energy storage/conversion and facilitate the integration of renewable energies into the electric grid. Exciting new research has focused on CO2 electrochemical activation/conversion through a co-electrolysis process based on the assumption that difficult CO double bonds can be activated effectively through this electrochemical method. Based on existing investigations, this paper puts forth a comprehensive overview of recent and past developments in co-electrolysis with SOECs for CO2 conversion and utilization. Here, we discuss in detail the approaches of CO2 conversion, the developmental history, the basic principles, the economic feasibility of CO2/H2O co-electrolysis, and the diverse range of fuel electrodes as well as oxygen electrode materials. SOEC performance measurements, characterization and simulations are classified and presented in this paper. SOEC cell and stack designs, fabrications and scale-ups are also summarized and described. In particular, insights into CO2 electrochemical conversions, solid oxide cell material behaviors and degradation mechanisms are highlighted to obtain a better understanding of the high temperature electrolysis process in SOECs. Proposed research directions are also outlined to provide guidelines for future research. © The Royal Society of Chemistry 2017.


Zhang S.,Donghua University | Zhang S.,University of California at Davis | Li F.-X.,Donghua University | Yu J.-y.,Donghua University | Hsieh Y.-L.,University of California at Davis
Carbohydrate Polymers | Year: 2010

Aqueous mixture of NaOH/urea/thiourea at a 8/8/6.5 composition and pre-cooled at -10 °C readily dissolved cellulose to produce stable solutions at relatively high concentrations. The exothermic dissolution process was favored at -2 to 0 °C. Aqueous NaOH/urea/thiourea solution as non-derivatizing solvent broke the intra- and inter-molecular hydrogen bonding of cellulose and prevented the approach toward each other of the cellulose molecules, leading to the good dispersion of cellulose to form solution. The strength of the solvent network structure as well as the interaction between cellulose and solvent decreased as a function of increasing solution temperature. In the semi-dilute entangled solutions (>3.5% concentration), the entropy-driven gelation occurred, and the gel temperature dropped with increasing cellulose contents in the solution. The NaOH/urea/thiourea/H2O was demonstrated to be the most powerful solvent among all aqueous NaOH solutions and this novel solvent does not degrade cellulose even after storage times of up to 1 month. © 2010 Elsevier Ltd. All rights reserved.


Liu Y.,Donghua University | Ma Y.,Donghua University | Guang S.,Donghua University | Xu H.,Donghua University | And 2 more authors.
Journal of Materials Chemistry A | Year: 2014

A novel approach to constructing three-dimensional (3D) highly ordered structural polyaniline-graphene bulk hybrid materials was proposed for high performance supercapacitor electrodes, in which a functional molecule, sulfonated triazine (ST), was introduced and adsorbed on graphene sheets via hydrogen bonding and π-π stacking interactions. The aim of adding ST is to achieve better dispersion of graphene nanosheets in water, and subsequently induce heterogeneous nucleation of polyaniline (PANI) through electrostatic interactions. Thus, the PANI nanorods were impelled to grow vertically on both surfaces of the individual sulfonated triazine functional graphene nanosheets (STGNS) via in situ chemical oxidative polymerization of aniline in aqueous solution. The formation mechanism of well-controlled PANI nanorod array-sulfonated triazine functional graphene nanosheet (PANI-STGNS) hybrid materials was investigated in detail using a combination of UV-vis, FTIR, Raman spectroscopy and XRD. The optimized PANI-STGNS10 bulk hybrid material possesses a specific capacitance as high as 1225 F g-1 at 1 A g-1, together with outstanding rate capability and cycling stability, which are essential for its application in high performance supercapacitor electrodes. © 2014 The Royal Society of Chemistry.


Yan Z.,Donghua University | Guang S.,Donghua University | Xu H.,Donghua University | Liu X.,National University of Singapore
Analyst | Year: 2011

In this contribution, a new, real-time and sensitive colorimetric sensor, di-N-methyl-N-hydroxyethylaniline squaraine (SQ), has been identified and synthesized for cysteine analysis based on its ΔA in neutral aqueous medium (pH ≈ 7.5). The proposed method was applied to analyse synthetic amino acid samples and human serum samples. The results show that the linear range of cysteine detection in aqueous medium at pH ≈ 7.5 is 10∼700 nmol L -1 with a correlation coefficient (R) of 0.9984 and a limit of detection (3σ, n = 20) of 3.9 nmol L-1. The relative standard deviation (RSD) for cysteine detection was lower than 4.1% (n = 5). The proposed method possesses the advantages of simplicity, rapidity, high selectivity and sensitivity. This makes it possible, for the first time, the real-time detection of cysteine under normal physiological conditions. © 2011 The Royal Society of Chemistry.


Qi J.,Donghua University | Qi J.,University of California at San Diego | Vazquez R.,University of Seville | Krstic M.,University of California at San Diego
IEEE Transactions on Automatic Control | Year: 2015

This paper introduces a methodology for modelling, analysis, and control design of a large-scale system of agents deployed in 3-D space. The agents' communication graph is a mesh-grid disk 2-D topology in polar coordinates. Treating the agents as a continuum, we model the agents' collective dynamics by complex-valued reaction-diffusion 2-D partial differential equations (PDEs) in polar coordinates, whose states represent the position coordinates of the agents. Due to the reaction term in the PDEs, the agents can achieve a rich family of 2-D deployment manifolds in 3-D space which correspond to the PDEs' equilibrium as determined by the boundary conditions. Unfortunately, many of these deployment surfaces are open-loop unstable. To stabilize them, a heretofore open and challenging problem of PDE stabilization by boundary control on a disk has been solved in this paper, using a new class of explicit backstepping kernels that involve the Poisson kernel. A dual observer, which is also explicit, allows to estimate the positions of all the agents, as needed in the leaders' feedback, by only measuring the position of their closest neighbors. Hence, an all-explicit control scheme is found which is distributed in the sense that each agent only needs local information. Closed-loop exponential stability in the L2, H1, and H2 spaces is proved for both full state and output feedback designs. Numerical simulations illustrate the proposed approach for 3-D deployment of discrete agents. © 1963-2012 IEEE.


Carbon fiber reinforced polyimide (CF/PI) composites have been filled with polyethylene-polyamine-treated carbon nanotube to enhance the adhesion. According to the modification, the interlaminar shear strength (ILSS) of composites has been greatly improved. Dynamic wetting method, XPS and SEM are used to examine the microscopic properties of resultant composites. The enhanced ILSS is attributed to the CNT interlock, which improves the wetting between carbon fibers and resins. © Taylor & Francis Group, LLC.


Yu Y.-S.,Shanghai University | Zheng H.,Donghua University
Molecular and Cellular Biochemistry | Year: 2012

In hypertensive animals and patients, oxidative stress represents the primary risk factor for progression of left ventricular hypertrophy. Recently, it has been demonstrated that hydrogen, as a novel antioxidant, can selectively reduce hydroxyl radicals and peroxynitrite anion to exert therapeutic antioxidant activity. In the current study, we explored the effect of chronic treatment with hydrogen-rich saline (HRS) on left ventricular hypertrophy in spontaneously hypertensive rats (SHR). The 8-week-old male SHR and age-matched Wistar-Kyoto rats (WKY) were randomized into HRS-treated (6 ml/kg/day for 3 months, i.p.) and vehicle-treated groups. HRS treatment had no significant effect on blood pressure, but it effectively attenuated left ventricular hypertrophy in SHR. HRS treatment abated oxidative stress, restored the activity of antioxidant enzymes including GPx, GST, catalase, and SOD, suppressed NADPH oxidase activity and downregulated Nox2 and Nox4 expression in left ventricles of SHR. HRS treatment suppressed pro-inflammatory cytokines including IL-1β, IL-6, TNF-α, and MCP-1, and inhibited NF-κB activation through preventing IκBα degradation in left ventricles of SHR. HRS treatment preserved mitochondrial function through restoring electron transport chain enzyme activity, repressing ROS formation, and enhancing ATP production in left ventricles of SHR. Moreover, HRS treatment suppressed ACE expression and locally reduced angiotensin II generation in left ventricles of SHR. In conclusion, HRS treatment attenuates left ventricular hypertrophy through abating oxidative stress, suppressing inflammatory process, preserving mitochondrial function, in which suppression of HRS on angiotensin II in left ventricles locally might be involved. © 2012 Springer Science+Business Media, LLC.


Pan H.,National University of Singapore | Pan H.,Zhejiang University | Liu X.Y.,National University of Singapore | Liu X.Y.,Donghua University | And 2 more authors.
Chemical Communications | Year: 2010

The process from the amorphous calcium phosphate phase to the hydroxyapatite (HAP) crystalline phase has been captured in a simulated physiological fluid by combining in situ extinction detection and ex situ electronic microscopy. The results reveal the secret of the phase transformation and orientation controls during the initial stage of mineral formation. © 2010 The Royal Society of Chemistry.


Yan Z.,Donghua University | Xu H.,Donghua University | Guang S.,Donghua University | Zhao X.,Shandong University | And 3 more authors.
Advanced Functional Materials | Year: 2012

A generic and effective approach for solving the aggregation effect observed with optical materials in solid state or in a solution with a poor solvent was explored by designing two types of squaraine-containing polyhedral oligomeric silsesquoixane (POSS)-based hybrids. It is expected that incorporation of "huge" inorganic POSS nanoparticles into optical materials via covalent bonding can effectively decrease the strong dipole-dipole and π-π stacking interactions, inhibit intermolecular charge transfer between adjacent squaraine molecules, and improve optical, thermal and chemical stability of the resultant materials. Both theoretical calculations and experimental results indicate that the molecular design strategy is rational and efficacious. The resultant organic-inorganic hybrid optical materials effectively eliminate the aggregation of organic optical chromophoric groups by hindering intermolecular charge transfer and decreasing dipole-dipole and π-π stacking interaction between the chromophores, and exhibit good optical stability, i.e., the absorption peaks of H1 and H2 display only a slight blue-shift, even in the solid. Simultaneously, the hybrids also show significantly enhanced thermal, and chemical stabilities in comparison with the precursor organic optical materials. Add POSS to make definite improvement: Incorporation of "huge" inorganic polyhedral oligomeric silsesquoixane (POSS) nanoparticles into organic optical materials via covalent bonding can effectively decrease the strong dipole-dipole and π-π stacking interactions, and inhibit intermolecular charge transfer between the chromophores to enable preparation of stable optical materials with enhanced thermal, chemical, and photostabilities. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Cui W.-X.,Donghua University | Fang J.-A.,Donghua University | Shen Y.-L.,Zilang Cocational Technical College | Zhang W.-B.,Donghua University
Neurocomputing | Year: 2013

In this paper, the problem of delay-dependent α-dissipativity analysis is investigated for a general class of singular systems with Markovian jump parameters and mode-dependent mixed time-delays. By using the novel Lyapunov-Krasovskii functional and stochastic analysis technology, the new criteria are derived to guarantee that the addressed singular systems are stochastically admissible and strictly (Q, R, S)-α-dissipative. Numerical examples are presented to illustrate the effectiveness and less conservativeness of the proposed theoretical results. © 2013 Elsevier B.V.


Su Y.,Donghua University
Advanced Materials Research | Year: 2011

The authors numerically simulated the natural ventilation in an industrial workshop with heat sources by computational fluid dynamics (CFD) method when the height of air inlet opening was set different values. The flow and temperature fields in the workshop were simulated by realizable k-ε turbulent model combined with a Discrete Ordinate (DO) radiate on. Results showed the height of air inlet opening strongly influenced the flow and temperature fields in the workshop. When the height of air inlet opening increased, the natural ventilation was improved and more fresh air flowed into the workshop. When the height of air inlet opening increased from 1.7 meters to 3 meters, the temperature in the operation zone of the workshop dropped. When the height of air inlet opening increased from 2.7 meters to 3.7 meters, the temperature in operation zone did not change much, while the temperature in the upper zone of the workshop dropped. The heat distribution factor decreased first with the height of air inlet opening and then increased again. When the height of air inlet opening was 3 meters, the heat distribution factor was minimal. © (2011) Trans Tech Publications, Switzerland.


Hou A.,Donghua University | Hou A.,University of California at Davis | Sun G.,University of California at Davis
Carbohydrate Polymers | Year: 2013

Aqueous solutions of 3,3′,4,4′-benzophenone tetracarboxylic dianhydride (BPTCD) were successfully employed in treatment of cotton fabrics to bring multiple functions onto the cotton cellulose. The overall reaction mechanism of the chemical finishing process was investigated. Results revealed that the dianhydride groups of BPTCD were hydrolyzed to tetracarboxylic acid groups, and the acid could directly react with hydroxyl groups on cellulose under the catalyst sodium hypophosphite to form ester bonds. Such a mechanism is different from the mostly recognized formation of anhydride from polycarboxylic acid and then esterification between the anhydride with hydroxyl groups. FTIR, DSC and thermogravimetric analyzer (TGA) were employed in the analysis of the reactions, respectively. © 2013 Elsevier Ltd.


Zhang L.,Fudan University | Liu T.,Donghua University | Liu T.,Shanghai Geriatric Institute of Chinese Medicine | Huang Y.,University of Toulon | Liu J.,Rutgers University
International Journal of Molecular Medicine | Year: 2011

Lung cancer is one of the main causes of cancer death worldwide. The cortactin gene, CTTN, may play a pivotal role in the proliferation and invasion of tumors. A microRNA (miR-182) was cloned and used to study the expression of CTTN and its regulatory effects on the proliferation and invasion of the lung cancer cell line, A549. Cortactin protein and CTTN mRNA expression decreased in A549 cells that were transfected with the miR-182 expression plasmid. A cell proliferation assay indicated that miR-182 expression affected cell cycle regulation and suppressed proliferation of lung cancer cells in vitro. In addition, xenograft experiments confirmed the suppression of tumor growth in vivo, which was due to the promotion of apoptosis. In conclusion, endogenous mature miR-182 expression may have an important role in the pathogenesis of lung cancer through its interference with the target gene CTTN by epigenetic modification.


Li J.-L.,National University of Singapore | Li J.-L.,Swinburne University of Technology | Liu X.-Y.,Donghua University | Liu X.-Y.,National University of Singapore
Advanced Functional Materials | Year: 2010

This article gives an overview of the current progress of a class of supramolecular soft materials consisting of fiber networks and the trapped liquid. After discussing the up-to-date knowledge on the types of fi ber networks and the correlation to the rheological properties, the gelation mechanism turns out to be one of the key subjects for this review. In this concern, the following two aspects will be focused upon: the single fi ber network formation and the multi-domain fi ber network formation of this type of material. Concerning the fi ber network formation, taking place via nucleation, and the nucleationmediated growth and branching mechanism, the theoretical basis of crystallographic mismatch nucleation that governs fi ber branching and formation of three-dimensional fi ber networks is presented. In connection to the multidomain fi ber network formation, which is governed by the primary nucleation and the subsequent formation of single fi ber networks from nucleation centers, the control of the primary nucleation rate will be considered. Based on the understanding on the the gelation mechanism, the engineering strategies of soft functional materials of this type will be systematically discussed. These include the control of the nucleation and branching-controlled fi ber network formation in terms of tuning the thermodynamic driving force of the gelling system and introducing suitable additives, as well as introducing ultrasound. Finally, a summary and the outlook of future research on the basis of the nucleation-growth-controlled fi ber network formation are given. © 2010 WILEY-VCH Verlag GmbH & Co. KGaA.


Ding B.,Donghua University | Si Y.,Donghua University | Wang X.,Donghua University | Yu J.,Donghua University | And 3 more authors.
Journal of Materials Chemistry | Year: 2011

A novel, ultrasensitive, selective and flexible sensor strip based on polyaniline/polyamide-6 (PANI/PA-6) nano-fiber/net (NFN) membranes for naked-eye colorimetric detection of Cu2+ ions in water is successfully prepared by a facile electro-spinning/netting (ESN) process. The sensing mechanism involves the transformations between different oxidation and doping forms of PANI. Upon exposure to Cu2+ aqueous solution, the sensors exhibit two significant reflectance intensity decreasing bands at 435 and 650 nm which induce the color changes from white to blue dramatically. This new sensor shows colorimetric response specifically to Cu2+ ions (white-to-blue color change) over other possible interfering metal cations and allows for detection of Cu2+ in aqueous solution with a low detection limit of 1 ppb observing by naked eye. Additionally, the colorimetric responses are visualized quantitative by using a color-differentiation map prepared from converted RGB (red, green and blue) values. Furthermore, the as-prepared PANI/PA-6 NFN sensor strips could successfully combine with the color map, which suggested a promising analytical method as an economical alternative to traditional Cu2+ sensors and also provided a new insight into the design and development of a novel colorimetric sensing system based on the NFN platform. © 2011 The Royal Society of Chemistry.


Lin J.,Donghua University | Ding B.,Donghua University | Yang J.,Donghua University | Yu J.,Donghua University | Sun G.,University of California at Davis
Nanoscale | Year: 2012

In this study, we conducted a subtle regulation of micro- and nanostructures of electrospun polystyrene (PS) fibers via tuning the molecular weights of the polymers with different sources, solvent compositions, and solution concentration. The surface morphology and porous structures of as-prepared PS fibers were characterized, and a full and intuitive observation of the porous structures as well as a tentative account of the formation of porous structures was presented. Additionally, the porous PS fibrous mats showed much higher oil absorption capacities than those of commercial polypropylene fibers in the form of a non-woven fabric, which displays a bight future for oil spill cleanups. We believe that such regulation of micro- and nanostructures of the PS fibers will widen the range of their applications in self-cleaning materials, ultra-high sensitivity sensors, tissue engineering, ion exchange materials, etc.


Cheng R.,University of Surrey | Jin Y.,University of Surrey | Jin Y.,Donghua University
Information Sciences | Year: 2015

Social learning plays an important role in behavior learning among social animals. In contrast to individual (asocial) learning, social learning has the advantage of allowing individuals to learn behaviors from others without incurring the costs of individual trials-and-errors. This paper introduces social learning mechanisms into particle swarm optimization (PSO) to develop a social learning PSO (SL-PSO). Unlike classical PSO variants where the particles are updated based on historical information, including the best solution found by the whole swarm (global best) and the best solution found by each particle (personal best), each particle in the proposed SL-PSO learns from any better particles (termed demonstrators) in the current swarm. In addition, to ease the burden of parameter settings, the proposed SL-PSO adopts a dimension-dependent parameter control method. The proposed SL-PSO is first compared with five representative PSO variants on 40 low-dimensional test functions, including shifted and rotated test functions. The scalability of the proposed SL-PSO is further tested by comparing it with five state-of-the-art algorithms for large-scale optimization on seven high-dimensional (100-D, 500-D, and 1000-D) benchmark functions. Our comparative results show that SL-PSO performs well on low-dimensional problems and is promising for solving large-scale problems as well. © 2014 Elsevier Inc. All rights reserved.


Gu Y.,Donghua University | Zhang Q.,Donghua University | Wang H.,Donghua University
Journal of Alloys and Compounds | Year: 2011

Tunable color point and efficient excitation are two important challenges for improving white light LEDs. In this paper, red-shift in the emission spectra of Sr2SiO4:Eu has been achieved, and the excitation band has been tuned to fit the blue LED chips simultaneously by doping N into the host. XRD results showed that the unit cell volume markedly increased after nitridation. Moreover, nitridation resulted in the increase in weight loss, which can be attributed to the substitute of Si-O bonds by Si-N bonds. The effect of nitridation on the luminescence properties was well discussed. © 2010 Elsevier B.V. All rights reserved.


Ji H.,University of Texas at Austin | Ji H.,CAS Hefei Key Laboratory of Materials for Energy Conversion | Zhao X.,University of Texas at Austin | Zhao X.,Donghua University | And 12 more authors.
Nature Communications | Year: 2014

Experimental electrical double-layer capacitances of porous carbon electrodes fall below ideal values, thus limiting the practical energy densities of carbon-based electrical double-layer capacitors. Here we investigate the origin of this behaviour by measuring the electrical double-layer capacitance in one to five-layer graphene. We find that the capacitances are suppressed near neutrality, and are anomalously enhanced for thicknesses below a few layers. We attribute the first effect to quantum capacitance effects near the point of zero charge, and the second to correlations between electrons in the graphene sheet and ions in the electrolyte. The large capacitance values imply gravimetric energy storage densities in the single-layer graphene limit that are comparable to those of batteries. We anticipate that these results shed light on developing new theoretical models in understanding the electrical double-layer capacitance of carbon electrodes, and on opening up new strategies for improving the energy density of carbon-based capacitors. © 2014 Macmillan Publishers Limited. All rights reserved.


Jianyong F.,Donghua University
Textile Research Journal | Year: 2013

Hemp fiber has many superior performances and applications, for instance, the yarns, woven fabrics, knitted fabrics and composite materials. However, there is no hemp nonwoven in the market and in application. Therefore, in order to continue to expand the application fields and increase the additional value of hemp fiber, we developed a hemp/cotton spunlaced nonwoven to research its oil filtration property and verify the filtration mechanisms. The results indicate that the filtration efficiency of a hemp/cotton spunlaced nonwoven increases with the increase in particle diameter and the decrease in filtration time. In addition, compared with the change in filtration efficiency with the increase in particle diameter, it can be found that the filtration time has a relatively smaller influence on filtration efficiency. The experimental results suggest that the filtration efficiencies of direct interception and gravitational deposition are substantially higher than inertia collision, while the filtration efficiency of inertia collision is so low that can be neglected. Through a theoretical analysis of filtration we make a verification of the mechanisms and suggest a new equation to reduce the errors in filtration efficiency between the theoretical results and experimental values. Then, the hemp/cotton spunlaced nonwoven was used to develop two different automobile engine oil filters on an experimental scale. © The Author(s) 2013.


Zhao X.D.,National University of Singapore | Fan H.M.,National University of Singapore | Fan H.M.,Northwest University, China | Liu X.Y.,National University of Singapore | And 2 more authors.
Langmuir | Year: 2011

Tuning the adhesive force on a superhydrophobic MnO 2 nanostructured film was achieved by fabricating different patterns including meshlike, ball cactus-like, and tilted nanorod structures. The marvelous modulation range of the adhesive forces from 130 to nearly 0 μN endows these superhydrophobic surfaces with extraordinarily different dynamic properties of water droplets. This pattern-dependent adhesive property is attributed to the kinetic barrier difference resulting from the different continuity of the three-interface contact line. This finding will provide the general strategies for the adhesion adjustment on superhydrophobic surfaces. © 2011 American Chemical Society.


Zhang D.,University of Ontario Institute of Technology | Zhang D.,Donghua University | Lei J.,University of Ontario Institute of Technology
Robotics and Computer-Integrated Manufacturing | Year: 2011

Kinematic analysis is one of the key issues in the research domain of parallel kinematic manipulators. It includes inverse kinematics and forward kinematics. Contrary to a serial manipulator, the inverse kinematics of a parallel manipulator is usually simple and straightforward. However, forward kinematic mapping of a parallel manipulator involves highly coupled nonlinear equations. Therefore, it is more difficult to solve the forward kinematics problem of parallel robots. In this paper, a novel three degrees-of-freedom (DOFs) actuation redundant parallel manipulator is introduced. Different intelligent approaches, which include the Multilayer Perceptron (MLP) neural network, Radial Basis Functions (RBF) neural network, and Support Vector Machine (SVM), are applied to investigate the forward kinematic problem of the robot. Simulation is conducted and the accuracy of the models set up by the different methods is compared in detail. The advantages and the disadvantages of each method are analyzed. It is concluded that ν-SVM with a linear kernel function has the best performance to estimate the forward kinematic mapping of a parallel manipulator. © 2010 Elsevier Ltd. All rights reserved.


Zhang B.,Shanghai University | Zhang B.,Donghua University | Weng Y.,Shanghai University | Xu H.,Donghua University | Mao Z.,Donghua University
Applied Microbiology and Biotechnology | Year: 2012

Biodiesel has attracted more and more attention in recent years because of its biodegradability, environmentally friendliness, and renewability. Contrary to the conventional chemical catalysis method to produce biodiesel, the biochemical catalysis method developed quickly in the past decade and many immobilized enzymes are commercially available to meet the large-scale industrialization of biodiesel. This review is focusing on the current status of biodiesel production by biochemical catalysis method, especially the commercial enzyme and its immobilization for biodiesel production. Consequently, we believe that biochemical catalysis with immobilized enzymes is bound to be an alternative method instead of chemical catalysis in biodiesel production in the near future. © 2011 Springer-Verlag.


Yang S.,Donghua University | Nair A.S.,Amrita University | Ramakrishna S.,National University of Singapore
Materials Letters | Year: 2014

Here we fabricated quantum dot-sensitized solar cells (QDSCs) based on electrospinning of unique TiO2 nanostructures and subsequent CdS QDs deposition via successive ionic layer adsorption and reaction (SILAR) followed by dipole treatment (DT). It was found that by treating with 4-methoxy benzenethiol for 24 h, an overall conversion efficiency of 1.17% was achieved under AM1.5 illumination which corresponds to a dramatic 100% enhancement compared with that of untreated cells. The significant photovoltaic improvement was attributed to the upward shifting of CdS QDs energy levels for efficient charge separation and effective electron transport in electrospun TiO 2 nanostructures which is confirmed by electrochemical impedance spectroscopy. © 2013 Elsevier B.V.


Tian L.,Donghua University | Prabhakaran M.P.,National University of Singapore | Ding X.,Donghua University | Ramakrishna S.,National University of Singapore
Journal of Biomaterials Science, Polymer Edition | Year: 2013

Emulsion electrospinning is an advanced technique to fabricate core-shell structured nanofibrous scaffolds, with great potential for drug encapsulation. Incorporation of dual factors hydroxyapatite (HA) and laminin, respectively, within the shell and core of nanofibers through emulsion electrospinning might be of advantageous in supporting the adhesion, proliferation, and maturation of cells instead of single factor-encapsulated nanofibers. We fabricated poly(L-lactic acid-co-ε-caprolactone) (PLCL)/hydroxyapaptite (PLCL/HA), PLCL/laminin (PLCL/Lam), and PLCL/hydroxyapatite/laminin (PLCL/HA/Lam) scaffolds with fiber diameter of 388 ± 35, 388 ± 81, and 379 ± 57 nm, respectively, by emulsion electrospinning. The elastic modulus of the prepared scaffolds ranged from 22.7-37.0 MPa. The osteoblast proliferation on PLCL/HA/Lam scaffolds, determined on day 21, was found 10.4% and 12.0% higher than the cell proliferation on PLCL/Lam or PLCL/HA scaffold, respectively. Cell maturation determined on day 14, by alkaline phosphatase (ALP) activity, was significantly higher on PLCL/HA/Lam scaffolds than the ALP activity on PLCL/HA and PLCL/Lam scaffolds (p ≤ 0.05). Results of the energy dispersive X-ray studies carried out on day 28 also showed higher calcium deposition by cells seeded on PLCL/HA/Lam scaffolds. Osteoblasts were found to adhere, proliferate, and mature actively on PLCL/HA/Lam nanofibers with enhanced cell proliferation, ALP activity, bone protein expression, and mineral deposition. Based on the results, we can conclude that laminin and HA individually played roles in osteoblast proliferation and maturation, and the synergistic function of both factors within the novel emulsion electrospun PLCL/HA/Lam nanofibers enhanced the functionality of osteoblasts, confirming their potential application in bone tissue regeneration. © 2013 © 2013 Taylor & Francis.


Ouyang C.,Donghua University | Zhu S.,Donghua University | Qu H.,Donghua University
Materials and Design | Year: 2012

The effects of doping with VC and Cr3C2 (grain growth inhibitors, GGIs) on the microstructural characteristics and mechanical properties of WC-MgO compacts prepared by hot-pressing sintering were investigated. GGIs suppressed the rate of densification during isothermal and non-isothermal sintering, but eventually increased the sintered density with extended holding time. Microstructure observation results revealed that the grain growth of WC was significantly retarded, and the homogeneity of MgO particulate dispersion and particulate/matrix interfacial coherence were improved effectively with the addition of GGIs. Meanwhile, the activation energy for grain growth during isothermal sintering increased from 426.85 to 492.53kJ/mol, which is consistent with the inhibition mechanism of VC and/or Cr3C2. The mechanical properties (hardness, fracture toughness and flexural strength) of compacts were enhanced by adding 0.25wt.% VC and 0.25wt.% Cr3C2. © 2012 Elsevier Ltd.


Bhattacharyya A.,PSG College of Technology | Chen S.,Donghua University | Zhu M.,Donghua University
Express Polymer Letters | Year: 2014

Reduced graphene oxide or graphene was dispersed in ultra high molecular weight polyethylene (UHMWPE) using two methods to prepare nanocomposite films. In pre-reduction method, graphite oxide (GO) was exfoliated and dispersed in organic solvents and reduced to graphene before polymer was added, while reduction of graphene oxide was carried out after polymer addition for in situ reduction method. Raman spectroscopic study reveals that the second method results in better exfoliation of graphene but it has more amorphous content as evident from selected area electron diffraction (SAED) pattern, wide angle X-ray and differential scanning calorimetry (DSC). The nanocomposite film produced by prereduction method possesses higher crystallinity (almost the same as that of the pure film) as compared to the in situ method. It shows better modulus (increased from 864 to 1236 MPa), better strength (increased from 12.6 to 22.2 MPa), network hardening and creep resistance (creep strain reduced to 9% from 50% when 40% of maximum load was applied for 72 h) than the pure film. These findings show that graphene can be used for reinforcement of UHMWPE to improve its tensile and creep resistance properties. © BME-PT.


Lei Y.,Donghua University
Applied Mechanics and Materials | Year: 2014

Mostly used in packing and outdoor facilities in the early stage, wood-plastic composites are gradually applied to other design sectors thanks to their advantageous features including cost efficiency, environmental protection, recyclability as well as being easy to be processed and fabricated. The application of this kind of green and new material in the exhibition design sector will be beneficial to developing the standardized structure and rapid fabrication in the exhibition design to save the project construction material costs and shorten erection time. In this article, the feasibility and ecological significance of using wood-plastic composites in the exhibition sector are explored from the aspects of the physical and chemical properties of the wood-plastic composites as well as their processing methods. © (2014) Trans Tech Publications, Switzerland.


Liu H.,Henan Normal University | Liu G.,Henan Normal University | Liu G.,Guangdong University of Technology | Shi X.,Donghua University
Colloids and Surfaces A: Physicochemical and Engineering Aspects | Year: 2010

We firstly report an electrochemical approach to fabricating N/Zr-codoped TiO2 nanotube arrays for photocatalytic applications. In this approach, TiO2 nanotube arrays were first prepared by anodic oxidation using titanium anode and platinum cathode. Then the formed TiO2 nanotube arrays and Pt were used as cathode and anode, respectively for subsequent formation of N/Zr-codoped TiO2 nanotube arrays through an electrochemical process in the presence of a solution of Zr(NO3)4 and NH4Cl. The morphology and composition of the N/Zr-codoped nanotube arrays were characterized using field-emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and UV-vis diffusion reflection spectroscopy (UV-vis DRS). The photocatalytic activities of the N/Zr-codoped TiO2 nanotube arrays were evaluated by the degradation of a model dye, rhodamine B. We show that the codoping with N and Zr elements significantly improves the photocatalytic efficiency of TiO2 nanotube arrays under both UV and visible light irradiation. XPS analysis suggests that the N impurities are interstitially doped into the TiO2 lattice, also enhancing the visible light sensitivity. Findings from this study suggest that through a simple codoping approach, TiO2 nanotube arrays with enhanced photocatalytic activity can be fabricated, thereby opening a new pathway to construct nanostructured TiO2-based composite materials for photocatalytic applications. © 2010 Elsevier B.V.


Liu J.,Donghua University | Liu J.,Nanjing Forestry University | Yue D.,Huazhong University of Science and Technology
International Journal of Robust and Nonlinear Control | Year: 2012

SUMMARY In this paper, we propose and investigate a new general model of fuzzy genetic regulatory networks described by the Takagi-Sugeno (T-S) fuzzy model with time-varying delays. By using a Lyapunov functional approach and linear matrix inequality (LMI) techniques, the stability criteria for the delayed fuzzy genetic regulatory networks are expressed as a set of LMIs, which can be solved numerically by LMI toolbox in Matlab. Two fuzzy genetic network example are given to verify the effectiveness and applicability of the proposed approach. © 2011 John Wiley & Sons, Ltd.


Rui Y.,Donghua University | Wang H.,Donghua University
CrystEngComm | Year: 2013

Sub-micrometer sized rutile TiO2 nanorod microspheres with diameters of 500-700 nm and with a specific surface area of 63.7 m2 g-1 were synthesized via a salt-assisted hydrothermal method. Morphological evolution as a function of reaction time was carried out to gain insight into the formation mechanism of the nanorod microspheres. Unlike traditional bulk rutile TiO2 particles, the nanorod microspheres could provide dual-functions of adsorbing dye molecules and strong light-harvesting efficiency when they were fabricated as a scattering overlayer in dye-sensitized solar cells (DSSCs). Furthermore, the inherent nanorods would provide excellent electron percolation pathways for charge transfer as confirmed by electrochemical impedance spectroscopy. Consequentially, DSSC with the scattering overlayer exhibited a 39% increment of cell efficiency (7.32%) compared with the DSSC without one (5.28%), and the efficiency was also a little higher than the DSSC with the same thickness composed of only nanocrystallites (7.14%). © 2013 The Royal Society of Chemistry.


Ji X.,Donghua University | Shen Q.,Donghua University | Liu F.,Donghua University | Ma J.,Shanghai University | And 3 more authors.
Journal of Hazardous Materials | Year: 2012

Eight antibiotic resistance genes (ARGs), 7 heavy metals, and 6 antibiotics were quantified in manures and soils collected from multiple feedlots in Shanghai. The samples were analyzed to determine if ARG abundances were associated with heavy metal concentration and independent of antibiotics. The results revealed the presence of chloramphenicol, sulfonamides and tetracyclines at concentration ranges of 3.27-17.85, 5.85-33.37 and 4.54-24.66mgkg-1, respectively. Typical heavy metals, such as Cu, Zn, and As, were detected at concentration ranges of 32.3-730.1, 75.9-4333.8, and 2.6-617.2mgkg-1. All ARGs tested were detected in the collected samples except tetB(P), which was absent in animal manures. Overall, sulfonamide ARGs were more abundant than tetracycline ARGs. Except for sulII, only a weak positive correlation was found between ARGs and their corresponding antibiotics. On the contrary, significant positive correlations (p<0.05) were found between some ARGs and typical heavy metals. For example, sulA and sulIII were strongly correlated with levels of Cu, Zn and Hg. The data demonstrated that the presence of ARGs was relatively independent of their respective antibiotic inducer. In addition to antibiotics, toxic heavy metals, such as Hg, Cu, and Zn, exerted a strong selection pressure and acted as complementary factors for ARG abundance. © 2012 Elsevier B.V.


Gu Q.,Donghua University | Ding Y.-S.,Donghua University | Zhang T.-L.,Donghua University
Protein and Peptide Letters | Year: 2010

We use approximate entropy and hydrophobicity patterns to predict G-protein-coupled receptors. Adaboost classifier is adopted as the prediction engine. A low homology dataset is used to validate the proposed method. Compared with the results reported, the successful rate is encouraging. The source code is written by Matlab. © 2010 Bentham Science Publishers Ltd.


Yang B.-H.,Donghua University | Yang B.-H.,Hefei University | Xu H.-Y.,Donghua University | Yang Z.-Z.,CAS Institute of Chemistry | Zhang C.,Donghua University
Journal of Materials Chemistry | Year: 2010

Four organic-inorganic hybrids were respectively synthesized via hydrosilylative addition reaction between octahydridosilsesquioxane (POSS) and linear dienes with different numbers of methylene groups, and well characterized by FTIR, 13C NMR and 29Si NMR technologies. It is confirmed that the hybrids have well-defined three-dimensional network structures with POSS cages uniformly dispersed in the networks. The four hybrids were then used as templates to produce silica films through an optimized spin-coating and calcination process. N2 sorption-desorption determination reveals that the silica films are nanoporous with a narrow pore distribution. Cross-section HRTEM images of the four films further confirm that the nanosize pores are evenly dispersed. SEM observation shows that the surfaces of the films are smooth and free of cracks or flaws. By altering the number of methylene groups of the dienes linking the POSS cages, pore size and porosity of the porous silica films are easily adjusted. After dehydroxylation treatment with trimethylchlorosilane (TMCS), the porous films show very low dielectric constants, which is closely related to the porosity of the film. This result reveals that the controllable preparation of low dielectric silica films has been achieved in this study. © The Royal Society of Chemistry 2010.


Peng S.,Nanyang Technological University | Peng S.,National University of Singapore | Tian L.,Donghua University | Liang J.,Nankai University | And 3 more authors.
ACS Applied Materials and Interfaces | Year: 2012

Polypyrrole(PPy) nanorod networks with a high electrical conductivity of 40 S cm-1 have been obtained in a high yield by employing an ion association of heparin-methylene blue as a new morphology-directing agent. The polypyrrole nanorod networks are mixed with different content of carbon nanoparticles to make PPy nanorod networks/carbon nanoparticles(PPy/C) counter electrodes. It is found that the PPy/C composite with 10% carbon content shows a lower charge transfer resistance and better catalytic performance for the reduction of I3-, compared with the pristine PPy and carbon electrodes. The better catalytic performance is attributed to the interaction of the superior electrocatalytic activity of the unique polypyrrole nanorod networks and the carbon nanoparticles, which can accelerate triiodide reduction and electron transfer in the electrode. Under standard AM 1.5 sunlight illumination, the dye-sensitized solar cell based on the PPy/C composite with 10% carbon content as the counter electrode demonstrates a high efficiency of 7.2%, which is much higher than that of pristine PPy and carbon electrode-based DSCs and comparable to that of the thermal decomposed Pt-based DSC. © 2011 American Chemical Society.


Li J.,Shanghai University | Wang L.,Donghua University | Jiang W.,Donghua University
Carbon | Year: 2010

The surfaces of bulk carbon nanotubes compacted by plasma spark sintering have been modified with polytetrofluorethylene, thereby producing a super-hydrophobic surface with a contact angle above 160°. The surface roughness and air trapped in pores and between the polytetrofluorethylene particles are responsible for the super-hydrophobility. The material can be machined into desired shapes with fine and complex channels, allowing internal surfaces to also be super-hydrophobic. © 2010 Elsevier Ltd. All rights reserved.


Zhang L.L.,University of Texas at Austin | Zhao X.,University of Texas at Austin | Zhao X.,Donghua University | Ji H.,University of Texas at Austin | And 7 more authors.
Energy and Environmental Science | Year: 2012

Many researchers have used nitrogen (N) as a dopant and/or N-containing functional groups to enhance the capacitance of carbon electrodes of electrical double layer (EDL) capacitors. However, the physical mechanism(s) giving rise to the interfacial capacitance of the N-containing carbon electrodes is not well understood. Here, we show that the area-normalized capacitance of lightly N-doped activated graphene with similar porous structure increased from 6 μF cm -2 to 22 μF cm -2 with 0 at%, and 2.3 at% N-doping, respectively. The quantum capacitance of pristine single layer graphene and various N-doped graphene was measured and a trend of upwards shifts of the Dirac Point with increasing N concentration was observed. The increase in bulk capacitance with increasing N concentration, and the increase of the quantum capacitance in the N-doped monolayer graphene versus pristine monolayer graphene suggests that the increase in the EDL type of capacitance of many, if not all, N-doped carbon electrodes studied to date, is primarily due to the modification of the electronic structure of the graphene by the N dopant. It was further found that the quantum capacitance is closely related to the N dopant concentration and N-doping provides an effective way to increase the density of the states of monolayer graphene. © 2012 The Royal Society of Chemistry.


Ren Z.-F.,Donghua University
Computers and Mathematics with Applications | Year: 2011

He's frequency formulation, derived on the basis of an ancient Chinese mathematical method, is an effective method for treating nonlinear oscillators. There are different approaches for choosing location points in the formulation. This paper suggests another location point, an example is given, and the accuracy is improved. © 2010 Elsevier Ltd. All rights reserved.


Du D.,Donghua University | Du D.,Shanghai University | Lou X.,Donghua University
Differentiation | Year: 2014

The sensory epithelium (SE) within the mammalian cochleae has a limited capacity for regeneration, and the loss of mammalian cochlear hair cells always lead to permanent hearing loss. Previous reports show that early postnatal cochlea harbors stem/progenitor-like cells nominated otospheres which have a limited regenerative/repair capacity, while these cell populations are progressively lost during the postnatal development. Induced pluripotent stem cells (iPS cells) directly reprogrammed from non-embryonic cells have captured great attentions in the scientific community. In the present study, we determine whether Yamanaka's factors can induce the reprogramming of cochlear cells into iPS cells. We introduce defined factors Oct3/4, Sox2 and Klf4 into otospheres derived from postnatal day-1 (P1) mouse SE, and analyze characteristics alterations in cochlear cells. After transduction, otospheres generated colonies exhibiting a normal karyotype and morphology similar to that of mouse embryonic stem cells (ESCs). Moreover, these cochlear iPS cells also express ESC-like markers. Importantly, the cochlear iPS cells show pluripotency in vitro and in vivo, as evidenced by differentiation into three germ layers by embryoid body formation, as well as high efficient formation of teratomas containing three germ layers in immunodeficient mice. Thus, pluripotent cochlear iPS cells can be generated from cochlear cells by using three Yamanaka's transcription factors. These attempts represent the first step toward generating fully pluripotent iPS cells from mammalian cochleae with defined exogenous genes. © 2014 International Society of Differentiation.


Wang Z.,Southern Cross University of Australia | Wang Z.,Donghua University | Bush R.T.,Southern Cross University of Australia | Liu J.,Donghua University
Chemosphere | Year: 2013

Iron-catalyzed oxidation of As(III) to As(V) can be highly effective for toxic arsenic removal via Fenton reaction and Fe(II) oxygenation. However, the contribution of ubiquitous organic ligands is poorly understood, despite its significant role in redox chemistry of arsenic in natural and engineered systems. In this work, selected naturally occurring organic ligands and synthetic ligands in co-oxidation of Fe(II) and As(III) were examined as a function of pH, Fe(II), H2O2, and radical scavengers (methanol and 2-propanol) concentration. As(III) was not measurably oxidised in the presence of excess ethylenediaminetetraacetic acid (EDTA) (i.e. Fe(II):EDTA<1:1), contrasting with the rapid oxidation of Fe(II) by O2 and H2O2 at neutral pH under the same conditions. However, partial oxidation of As(III) was observed at a 2:1 ratio of Fe(II):EDTA. Rapid Fe(II) oxidation in the presence of organic ligands did not necessarily result in the coupled As(III) oxidation. Organic ligands act as both iron speciation regulators and radicals scavengers. Further quenching experiments suggested both hydroxyl radicals and high-valent Fe species contributed to As(III) oxidation. The present findings are significant for the better understanding of aquatic redox chemistry of iron and arsenic in the environment and for optimization of iron-catalyzed arsenic remediation technology. © 2013 Elsevier Ltd.


Pan H.,Donghua University | Sun G.,University of California at Davis | Sun G.,Donghua University | Zhao T.,Donghua University
International Journal of Biological Macromolecules | Year: 2013

Amination of lignin can bring reactive amino groups onto the natural polymer and enable it to be employed in engineering materials. The amination reaction was successfully implemented after some of the hydroxyl groups on lignin were epoxidized. The resulted products showed a great quantity of primary amine group and secondary amine group which can be used as curing agents of epoxy resin. The results revealed that several factors including reaction temperature and time, as well as ratios of compounds, could influence the epoxidation and amination reactions. The resulted products were characterized by FT-IR spectra, 1H NMR, 13C NMR, element analysis, XPS and thermogravimetry analysis. © 2013 Elsevier B.V.


Zhong S.,National University of Singapore | Zhang Y.,Donghua University | Lim C.T.,National University of Singapore
Tissue Engineering - Part B: Reviews | Year: 2012

In the past decade, considerable effort has been made to construct biomimetic scaffolds from electrospun nanofibers for engineering different tissues. However, one of the major concerns with electrospun nanofibrous scaffolds is that the densely arranged architecture of fibers and small pores or voids between fibers hinder efficient cellular infiltration or prevent three dimensional (3D) cellular integration with host tissue in vivo after implantation. To overcome this problem, many concepts or strategies applicable during the electrospinning or post-electrospinning procedures have been proposed to enlarge pore size of electrospun scaffolds. This article addresses the issues of pore geometry and cellular infiltration of electrospun scaffolds, and first reviews the fabrication solutions/approaches applied to achieve larger micropores in electrospun mats. The evidence and potential for fostering cellular infiltration using these improved porous scaffolds are then discussed. Finally, it is hoped that this will enable us to better exploit viable technologies or develop new ones for constructing ideal nanofibrous architecture for fulfilling specific tissue engineering needs. © 2012 Mary Ann Liebert, Inc.


Zhong C.,Tianjin University of Technology | Deng Y.,Tianjin University | Hu W.,Tianjin University of Technology | Hu W.,Tianjin University | And 3 more authors.
Chemical Society Reviews | Year: 2015

Electrolytes have been identified as some of the most influential components in the performance of electrochemical supercapacitors (ESs), which include: electrical double-layer capacitors, pseudocapacitors and hybrid supercapacitors. This paper reviews recent progress in the research and development of ES electrolytes. The electrolytes are classified into several categories, including: aqueous, organic, ionic liquids, solid-state or quasi-solid-state, as well as redox-active electrolytes. Effects of electrolyte properties on ES performance are discussed in detail. The principles and methods of designing and optimizing electrolytes for ES performance and application are highlighted through a comprehensive analysis of the literature. Interaction among the electrolytes, electro-active materials and inactive components (current collectors, binders, and separators) is discussed. The challenges in producing high-performing electrolytes are analyzed. Several possible research directions to overcome these challenges are proposed for future efforts, with the main aim of improving ESs' energy density without sacrificing existing advantages (e.g., a high power density and a long cycle-life) (507 references). © The Royal Society of Chemistry.


Du N.,National University of Singapore | Du N.,Singapore MIT Alliance for Research and Technology | Yang Z.,National University of Singapore | Liu X.Y.,National University of Singapore | And 2 more authors.
Advanced Functional Materials | Year: 2011

Spider dragline silk, as a type of high-performance natural fiber, displays a unique combination of tensile strength and extensibility that gives rise to a greater toughness than any other natural or synthetic fiber. In contrast to silkworm silk, spider dragline silk displays a remarkable strain-hardening character for which the origin remains unknown. In this paper, the performance of silkworm silk and spider dragline fibers under stretching is compared based on a combined structural and mechanical analysis. The molecular origin of the strain-hardening of spider silk filaments is addressed in comparison to rubber and Kevlar. Unlike rubber, the occurrence of strain-hardening can be attributed to the unfolding of the intramolecular β-sheets in spider silk fibrils, which serve as "molecular spindles" to store lengthy molecular chains in space compactly. With the progressive unfolding and alignment of protein during fiber extension, protein backbones and nodes of the molecular network are stretched to support the load. Consequently the dragline filaments become gradually hardened, enabling efficient energy buffering when an abseiling spider escapes from a predator. As distinct from synthetic materials such as rubber (elastomers), this particular structural feature of spider draglines not only enables quick energy absorption, but also efficiently suppresses the drastic oscillation which occurs upon an impact. The mimicking of this strain-hardening character of spider silk will give rise to the design and fabrication of new advanced functional materials with applications in kinetic energy buffering and absorption. The structural response of spider dragline fiber to stretching is distinct from that of silkworm silk. The unfolding of the intramolecular β-sheets in spider silk fibrils gives rise to strain-hardening behavior, enabling efficient energy buffering and absorption when an abseiling spider escapes from a predator. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Lin N.,Donghua University | Liu X.Y.,Donghua University | Diao Y.Y.,National University of Singapore | Xu H.,Donghua University | And 4 more authors.
Advanced Functional Materials | Year: 2012

A generic and effective approach to "switch on" and enhance the two-photon fluorescence (TPF) emission of quenched TPF molecules, i.e., fluorene derivatives, is reported in terms of molecular recognition with a decoupling medium. Such a medium, in this case Bombyx mori silk, can recognize TPF molecules and inhibit the aggregation of the TPF molecules. The designed TPF molecules are 2,7-bis[2-(4-nitrophenyl)ethenyl]-9,9-dibutylfluorene (4NF) and 2,7-bis[2-(4-nitrophenyl)ethenyl]-9,9-dioctylfluorene (8NF), which exhibit suppressed TPF emission owing to molecular-stacking-led aggregation in the solid form. Due to the specific recognition between -NO 2 in the quenched fluorescent molecules and -NH groups in silk fibroin molecules, the aggregated molecules of 4NF/8NF molecules are decoupled. This decoupling gives rise to a significant increase in TPF quantum yields. The mechanism is further confirmed by replacing the terminal group -NO 2 in 8NF with -CH 3 (in 2,7-bis[2-(4-methylphenyl)ethenyl]-9,9-dioctylfluorene; 8MF) to eliminate the possibility of molecular recognition. As predicted, in the case of 8MF the switching-on effect is eliminated. Completely new TPF silk fibers can additionally be applied in real-time 3D high-resolution TPF scaffold bioimaging. Luminescent silk fibers that exhibit two-photon fluorescence are prepared by combining Bombyx mori silk with fluorene derivatives. The enhancement mechanism is based on biomolecular recognition by decoupling the molecules in the special silk fibers. This work provides a promising solution for imaging of scaffolds in a noninvasive, high-resolution, 3D, and real-time manner. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Ma J.,Donghua University | Zhu S.,Donghua University | Ouyang C.,Donghua University
Journal of the European Ceramic Society | Year: 2011

Two-step hot-pressing sintering (TSS) was applied to consolidate nanocomposite tungsten carbide-magnesia (WC-MgO) powders. The first step sintering was employed at a higher temperature to obtain an initial high density, and the second step was held at a lower temperature by isothermal sintering for several hours to increase bulk density without significant grain growth. The experimental results showed the sintering temperature plays an important role in densification and grain growth of WC-MgO compacts. The optimum TSS regime consisted of heating at 1750°C (1st step) and 1550°C (2nd step), resulting in the formation of near full dense microstructure (0.99 TD) with suppressed grain growth (2.59μm). Accordingly, the improvement on the mechanical properties, including increase in the hardness (from 16.7 to 18.4GPa), fracture toughness (from 10.2 to 12.95MPam1/2) and flexural strength (from 976.6 to 1283.7MPa), was also observed due to the grain refining and full dense bulk. © 2011 Elsevier Ltd.


Song G.,Donghua University | Wang Q.,Shanghai JiaoTong University | Wang Y.,Fudan University | Lv G.,Shanghai University | And 7 more authors.
Advanced Functional Materials | Year: 2013

Copper chalcogenides have been demonstrated to be a promising photothermal agent due to their high photothermal conversion efficiency, synthetic simplicity, and low cost. However, the hydrophobic and less biocompatible characteristics associated with their synthetic processes hamper widely biological applications. An alternative strategy for improving hydrophilicity and biocompatibility is to coat the copper chalcogenide nanomaterials with silica shell. Herein, the rational preparation design results in successful coating mesoporous silica (mSiO2) on as-synthesized Cu 9S5 nanocrystals, forming Cu9S 5@mSiO2-PEG core-shell nanostructures. As-prepared Cu 9S5@mSiO2-PEG core-shell nanostructures show low cytotoxicity and excellent blood compatibility, and are effectively employed for photothermal ablation of cancer cells and infrared thermal imaging. Moreover, anticancer drug of doxorubicin (DOX)-loaded Cu9S 5@mSiO2-PEG core-shell nanostructures show pH sensitive release profile and are therefore beneficial to delivery of DOX into cancer cells for chemotherapy. Importantly, the combination of photothermal- and chemotherapies demonstrates better effects of therapy on cancer treatment than individual therapy approaches in vitro and in vivo. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Zhong S.P.,National University of Singapore | Zhang Y.Z.,Donghua University | Lim C.T.,National University of Singapore
Wiley Interdisciplinary Reviews: Nanomedicine and Nanobiotechnology | Year: 2010

One of the major applications of tissue-engineered skin substitutes for wound healing is to promote the healing of cutaneous wounds. In this respect, many important clinical milestones have been reached in the past decades. However, currently available skin substitutes for wound healing often suffer from a range of problems including wound contraction, scar formation, and poor integration with host tissue. Engineering skin substitutes by tissue engineering approach has relied upon the creation of three-dimensional scaffolds as extracellular matrix (ECM) analog to guide cell adhesion, growth, and differentiation to form skin-functional and structural tissue. The three-dimensional scaffolds can not only cover wound and give a physical barrier against external infection as wound dressing, but also can provide support both for dermal fibroblasts and the overlying keratinocytes for skin tissue engineering. A successful tissue scaffold should exhibit appropriate physical and mechanical characteristics and provide an appropriate surface chemistry and nano and microstructures to facilitate cellular attachment, proliferation, and differentiation. A variety of scaffolds have been fabricated based on materials ranging from naturally occurring ones to those manufactured synthetically. This review discusses a variety of commercial or laboratory-engineered skin substitutes for wound healing. Central to the discussion are the scaffolds/materials, fabrication techniques, and their characteristics associated with wound healing. One specifically highlighted emerging fabrication technique is electrospinning that allows the design and fabrication of biomimetic scaffolds that offer tremendous potential applications in wound healing of skin. © 2010 John Wiley & Sons, Inc.


Rui Y.,Donghua University | Li Y.,Donghua University | Zhang Q.,Donghua University | Wang H.,Donghua University
Nanoscale | Year: 2013

TiO2 microspheres assembled by single crystalline rutile TiO2 nanorods were synthesized by one-pot solvothermal treatment at 180 °C based on an aqueous-organic mixture solution containing n-hexane, distilled water, titanium n-butoxide and hydrochloric acid. The spheres had a radiative structure from the center, and their diameters were controlled in the range from 1 to 5 μm by adjusting the volume of the reactant water. Nitrogen adsorption-desorption isotherms showed that all the as-prepared microspheres had relatively high specific surface areas of about 50 m2 g -1. The 1 μm sized TiO2 nanorod microspheres were fabricated as a scattering overlayer in DSSCs, leading to a remarkable improvement in the power conversion efficiency: 8.22% of the bi-layer DSSCs versus 7.00% for the reference cell made of a single-layer film prepared from nanocrystalline TiO2. Such improvement was mainly attributed to the enhanced light harvesting and dye loading brought by the effective scattering centers. © 2013 The Royal Society of Chemistry.


Wang X.,Donghua University | Ding B.,Donghua University | Yu J.,Donghua University | Si Y.,Donghua University | And 2 more authors.
Nanoscale | Year: 2011

Two-dimensional (2D) polyacrylic acid (PAA) nano-nets that comprise interlinked ultrathin nanowires with diameters of 10-30 nm are successfully prepared by a facile electro-netting process. Nano-nets feature a clear geometric characteristic with ideal and weighted Steiner networks due to the rapid phase separation process and its obeyed minimal energy principle. The versatile nano-nets create enhanced interconnectivity and additional surface area and facilitate the diffusion of analytes into the membranes, which significantly boost the gas diffusion coefficient and sensing properties. As one example, PAA membranes containing fibers and nano-nets used as sensing materials are deposited by electrospinning/electro-netting on an electrode of a quartz crystal microbalance (QCM) for trimethylamine (TMA) detection, which exhibits a quick response (∼180 s), low detection limit (1 ppm) and ideal selectivity at room temperature. © 2011 The Royal Society of Chemistry.


Yang S.,Donghua University | Wang X.,Donghua University | Ding B.,Donghua University | Yu J.,Donghua University | And 2 more authors.
Nanoscale | Year: 2011

Soap-bubble-like structured polyacrylic acid (PAA) nano-nets that comprise interlinked ultrathin nanowires with diameters of 10-35 nm are controllably prepared by a one-step electro-netting process. © 2011 The Royal Society of Chemistry.


Wang C.-Y.,Shanghai JiaoTong University | Zhang K.-H.,Donghua University | Fan C.-Y.,Shanghai JiaoTong University | Mo X.-M.,Donghua University | And 2 more authors.
Acta Biomaterialia | Year: 2011

Peripheral nerve regeneration remains a significant clinical challenge to researchers. Progress in the design of tissue engineering scaffolds provides an alternative approach for neural regeneration. In this study aligned silk fibroin (SF) blended poly(l-lactic acid-co - caprolactone) (P(LLA-CL)) nanofibrous scaffolds were fabricated by electrospinning methods and then reeled into aligned nerve guidance conduits (NGC) to promote nerve regeneration. The aligned SF/P(LLA-CL) NGC was used as a bridge implanted across a 10 mm defect in the sciatic nerve of rats and the outcome in terms of of regenerated nerve at 4 and 8 weeks was evaluated by a combination of electrophysiological assessment and histological and immunohistological analysis, as well as electron microscopy. The electrophysiological examination showed that functional recovery of the regenerated nerve in the SF/P(LLA-CL) NGC group was superior to that in the P(LLA-CL) NGC group. The morphological analysis also indicated that the regenerated nerve in the SF/P(LLA-CL) NGC was more mature. All the results demonstrated that the aligned SF/P(LLA-CL) NGC promoted peripheral nerve regeneration significantly better in comparison with the aligned P(LLA-CL) NGC, thus suggesting a potential application in nerve regeneration. © 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.


Tian Q.,Donghua University | Hu J.,Donghua University | Zhu Y.,King Abdullah University of Science and Technology | Zou R.,Donghua University | And 7 more authors.
Journal of the American Chemical Society | Year: 2013

Photothermal nanomaterials have recently attracted significant research interest due to their potential applications in biological imaging and therapeutics. However, the development of small-sized photothermal nanomaterials with high thermal stability remains a formidable challenge. Here, we report the rational design and synthesis of ultrasmall (<10 nm) Fe3O 4@Cu2-xS core-shell nanoparticles, which offer both high photothermal stability and superparamagnetic properties. Specifically, these core-shell nanoparticles have proven effective as probes for T 2-weighted magnetic resonance imaging and infrared thermal imaging because of their strong absorption at the near-infrared region centered around 960 nm. Importantly, the photothermal effect of the nanoparticles can be precisely controlled by varying the Cu content in the core-shell structure. Furthermore, we demonstrate in vitro and in vivo photothermal ablation of cancer cells using these multifunctional nanoparticles. The results should provide improved understanding of synergistic effect resulting from the integration of magnetism with photothermal phenomenon, important for developing multimode nanoparticle probes for biomedical applications. © 2013 American Chemical Society.


Dong M.,Shanghai JiaoTong University | Yang D.,Donghua University | Su L.,Shanghai JiaoTong University
Expert Systems with Applications | Year: 2011

With the development of mass customization (MC) paradigm, service product/package configuration is getting crucial to service industry. Aiming to extend the achievements of product configuration in manufacturing industry to service industry and considering ontology's reusability, an ontology-based service product modeling approach for configuration is presented in this paper. Firstly, service variants of service products are represented through the feature modeling approach. Then, the feature-based service model is formalized in OWL (Ontology Web language) - an ontology language for semantic web, and configuration rules are formalized in SWRL (Semantic Web Rule Language) - a rule language. Configuration reasoning processes are performed with the support of JESS (Java Expert System Shell) rule engine. Finally, the proposed approach to service customization is demonstrated by an example of configuring service packages for China Mobile. © 2011 Elsevier Ltd. All rights reserved.


Yang H.,Shanghai Normal University | Zhang C.,Shanghai Normal University | Shi X.,Donghua University | Hu H.,Shanghai Normal University | And 5 more authors.
Biomaterials | Year: 2010

We report here a thermal decomposition approach to the synthesis of water-soluble superparamagnetic manganese ferrite (MnFe2O4) nanoparticles (NPs) for magnetic resonance (MR) imaging applications. In this approach, tetraethylene glycol was utilized as a coordination and stabilization agent, rendering the NPs water-soluble and stable. The formed NPs had a diameter of 7 nm with a narrow size distribution, and were superparamagnetic with a saturated magnetization (Ms) of 39 emu/g. In vitro cytotoxicity test revealed that the MnFe2O4 NPs were biocompatible at a particle concentration below 200 μg/mL. The transverse relaxivity of MnFe2O4 NPs in water and cells after incubation were determined to be 189.3 mm-1 s-1 and 36.8 mm-1 s-1 based on iron concentration, respectively. In vivo MR imaging studies in conjunction with inductively coupled plasma-atomic emission spectroscopy showed that the MnFe2O4 NPs were preferentially accumulated in liver after intravenous injection for 4 h. This suggests that the developed MnFe2O4 NPs can serve as a sensitive MR imaging contrast agent for liver imaging. By appropriately modifying or functionalizing the surface of the NPs, these particles may be used for MR detection of other diseases. Crown Copyright © 2010.


Zhu J.,Donghua University | Zheng L.,Shanghai JiaoTong University | Wen S.,Donghua University | Tang Y.,Shanghai JiaoTong University | And 3 more authors.
Biomaterials | Year: 2014

Development of multifunctional theranostic nanoplatforms for targeted cancer imaging and therapy still remains a great challenge. Herein, we report the use of multifunctional dendrimer-entrapped gold nanoparticles (Au DENPs) covalently linked with α-tocopheryl succinate (α-TOS) as a platform for targeted cancer computed tomography (CT) imaging and therapy. In this study, amine-terminated poly(amidoamine) dendrimers of generation 5 (G5.NH2) conjugated with fluorescein isothiocyanate (FI), polyethylene glycol (PEG)-modified α-TOS, and PEGylated folic acid (FA) were used as templates to synthesize Au DENPs, followed by acetylation of the remaining dendrimer terminal amines. The formed multifunctional Au DENPs were characterized via different techniques. We show that the Au DENPs conjugated with approximately 9.8 α-TOS molecules per dendrimer and with an Au core size of 3.3nm are water-dispersible, and stable under different pH and temperature conditions and in different aqueous media. The FA modification onto the Au DENPs enables efficient targeting of the particles to cancer cells overexpressing FA receptors (FAR), and effective targeted CT imaging of the cancer cells invitro and the xenografted tumor model invivo. Likewise, the covalent conjugation of α-TOS does not compromise its therapeutic activity, instead significantly improves its water solubility. Importantly, thanks to the role of FA-directed targeting, the formed multifunctional Au DENPs are able to exert the specific therapeutic efficacy of α-TOS to the FAR-overexpressing cancer cells invitro and the xenografted tumor model invivo. The developed multifunctional Au DENPs may hold a great promise to be used as a unique theranostic nanoplatform for targeted CT imaging and therapy of different types of cancer. © 2014 Elsevier Ltd.


Hou C.,Donghua University | Duan Y.,Shanghai JiaoTong University | Zhang Q.,Donghua University | Wang H.,Donghua University | Li Y.,Donghua University
Journal of Materials Chemistry | Year: 2012

For biomimetic applications, an artificial material is needed to be self-healing, electroactive and bio-applicable. Herein we report a strategy to build a graphene-poly(N,N-dimethylacrylamide) (PDMAA) cross-linking structure based on graphene networks. The obtained hydrogel exhibits good neural compatibility, high conductivity, low impedance and efficient near-infrared-triggered photothermal self-healing behaviour owing to its unique 3-dimensional graphene-PDMAA cross-linking networks. The results indicate that the graphene-PDMAA hydrogel has potential for application as an artificial tissue. This journal is © The Royal Society of Chemistry 2012.


Cai H.,Donghua University | Li K.,Shanghai JiaoTong University | Shen M.,Donghua University | Wen S.,Donghua University | And 5 more authors.
Journal of Materials Chemistry | Year: 2012

We report a facile approach for fabrication of Fe 3O 4@Au nanocomposite particles (NCPs) as a dual mode contrast agent for both magnetic resonance (MR) and computed tomography (CT) imaging applications. In this study, Fe 3O 4 nanoparticles (NPs) prepared by a controlled coprecipitation approach were used as core particles for subsequent electrostatic layer-by-layer (LbL) assembly of poly(γ-glutamic acid) (PGA) and poly(l-lysine) (PLL) to form PGA/PLL/PGA multilayers, followed by assembly with dendrimer-entrapped gold NPs (Au DENPs) formed using amine-terminated generation 5 poly(amidoamine) dendrimers as templates. After crosslinking the multilayered shell of PGA/PLL/PGA/Au DENPs via EDC chemistry, the remaining amine groups of the outermost layer of Au DENPs were acetylated to neutralize the surface charge of the particles. The formed Fe 3O 4@Au NCPs were well characterized via different techniques. We show that the formed Fe 3O 4@Au NCPs are colloidally stable, hemocompatible, and biocompatible in the given concentration range (0-100 μg mL -1). The relatively high r 2 relaxivity (71.55 mM -1 s -1) and enhanced X-ray attenuation property when compared with either the uncoated Fe 3O 4 NPs or the Au DENPs afford the developed Fe 3O 4@Au NCPs with a capacity not only for dual mode CT and MR imaging of cells in vitro, but also for MR imaging of liver and CT imaging of subcutaneous tissue in vivo. With the facile integration of both Fe 3O 4 NPs and Au DENPs within one particle system via the LbL assembly technique and dendrimer chemistry, it is expected that the fabricated Fe 3O 4@Au NCPs may be further modified with multifunctionalities for multi-mode imaging of various biological systems. This journal is © The Royal Society of Chemistry 2012.


Tan L.,Shanghai JiaoTong University | Wan A.,Shanghai JiaoTong University | Pan D.,Donghua University
Materials Letters | Year: 2011

A new spinning method - pregelled gel spinning method for polyacrylonitrile (PAN) precursor fiber was reported. The physical and structural properties of the pregelled gel spun PAN precursor fibers as well as dry-jet wet spun PAN precursor fibers were studied. Compared with the dry-jet wet spun fibers, the pregelled gel spun fibers had reduced core-shell difference, circular cross sections and fewer internal pores. The pregelled gel spun fibers were found to have higher crystallinity and larger crystallite size than the dry-jet wet spun fibers. The tensile stress relaxation tests suggested that the pregelled gel spun fibers had higher elasticity and better developed supermolecular structure. © 2010 Elsevier B.V. All rights reserved.


Liu Y.,Shanghai JiaoTong University | Gu D.,Shanghai JiaoTong University | Liu Z.,Shanghai JiaoTong University | Li W.,Donghua University | Li W.,Integrate
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2012

LBlock is a lightweight block cipher with 32 rounds, which can be implemented efficiently not only in hardware environment but also in software platforms. In this paper, by exploiting the structure of LBlock and the redundancy in its key schedule, we propose an impossible differential attack on 21-round LBlock based on a 14-round impossible differential. The data and time complexities are about 2 62.5 chosen plaintexts and 2 73.7 21-round encryptions, respectively. As far as we know, these results are the currently best results on LBlock in the single key scenario. © 2012 Springer-Verlag.


Yue B.,University of Wollongong | Yue B.,Donghua University | Wang C.,University of Wollongong | Ding X.,Donghua University | Wallace G.G.,University of Wollongong
Electrochimica Acta | Year: 2012

Wearable electronics offer the combined advantages of both electronics and fabrics. Being an indispensable part of these electronics, lightweight, stretchable and wearable power sources are strongly demanded. Here we describe a daily-used nylon lycra fabric coated with polypyrrole as electrode for stretchable supercapacitors. Polypyrrole was synthesized on the fabric via a simple chemical polymerization process with ammonium persulfate (APS) as an oxidant and naphthalene-2,6-disulfonic acid disodium salt (Na 2NDS) as a dopant. This material was characterized with FESEM, FTIR, tensile stress, and studied as a supercapacitor electrode in 1.0 M NaCl. This conductive textile could endure 1000 stretching cycles with 100% strain applied, and still retained its electrical conductivity and electrochemical properties. Interestingly, we also found that this material showed improved electrochemical properties when it was being stretched. © 2012 Elsevier Ltd. All rights reserved.


Li X.,Donghua University | Xi Y.,Shanghai JiaoTong University
ASCC 2011 - 8th Asian Control Conference - Final Program and Proceedings | Year: 2011

Cooperative control of multi-agent system has been extensively discussed for groups with single-layer topology. This paper is unfolded from the problem of consensus and discusses how to decompose a single-layer topology into layers of connected subgraphs to improve the cooperative performance of group. A hierarchical decomposition algorithm is developed to split the topology into hierarchy. On the premise that each agent can only interact with its neighbors restricted by the original topology of system, performing consensus within the hierarchical structure obtained by our algorithm will yield the fastest convergence when compared with running consensus on original single-layer topology or other hierarchical structures. This paper also presents a connection between topological structure of group and the global performance in cooperative control. © 2011 Asian Control Association.


Wei W.,Donghua University | Du J.,University of California at Los Angeles | Li J.,University of California at Los Angeles | Yan M.,University of California at Los Angeles | And 6 more authors.
Advanced Materials | Year: 2013

Nanocapsules of organophosphorous hydrolase with enhanced enzyme activity and stability are prepared via in situ polymerization, providing a novel class of nanoparticles for the decontamination and detoxification of organophosphates such as chemical warfare agents and pesticides. Using the nanocapsules as building blocks, bioactive nanocomposites are also fabricated, enabling their use for organophosphate protection. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Wei S.,Anyang University, China | Wang S.,Anyang University, China | Zhang Y.,Henan University of Urban Construction | Zhou M.,Donghua University
Sensors and Actuators, B: Chemical | Year: 2014

Different morphologies of ZnO nanomaterials (long nanofibers, rod-like short nanofibers and nano-powders) were successfully synthesized by electrospinning process and chemical precipitation, respectively. A comparative ethanol sensing study among the three samples were also performed. The results indicate that the ZnO long nanofiber sensor shows desirable response to ethanol at 270 C with good stability, which is attributed to the long nanofiber structures. This sample also presents good selectivity and fast response-recovery properties (7-9 and 9-11 s, respectively). The ethanol sensing mechanism and the advantages of the long nanofiber structure in sensing materials were also discussed. © 2013 Elsevier B.V.


Li J.,Donghua University | Hu Y.,Donghua University | Yang J.,Shanghai JiaoTong University | Wei P.,Donghua University | And 4 more authors.
Biomaterials | Year: 2015

Development of multifunctional theranostic nanoplatforms for diagnosis and therapy of cancer still remains a great challenge. In this work, we report the use of hyaluronic acid-modified Fe3O4 at Au core/shell nanostars (Fe3O4 at Au-HA NSs) for tri-mode magnetic resonance (MR), computed tomography (CT), and thermal imaging and photothermal therapy of tumors. In our approach, hydrothermally synthesized Fe3O4 at Ag nanoparticles (NPs) were used as seeds to form Fe3O4 at Au NSs in the growth solution. Further sequential modification of polyethyleneimine (PEI) and HA affords the NSs with excellent colloidal stability, good biocompatibility, and targeting specificity to CD44 receptor-overexpressing cancer cells. With the Fe3O4 core NPs and the star-shaped Au shell, the formed Fe3O4 at Au-HA NSs are able to be used as a nanoprobe for efficient MR and CT imaging of cancer cells invitro and the xenografted tumor model invivo. Likewise, the NIR absorption property enables the developed Fe3O4 at Au-HA NSs to be used as a nanoprobe for thermal imaging of tumors invivo and photothermal ablation of cancer cells invitro and xenografted tumor model invivo. This study demonstrates a unique multifunctional theranostic nanoplatform for multi-mode imaging and photothermal therapy of tumors, which may find applications in theranostics of different types of cancer. © 2014 Elsevier Ltd.


Wei S.,Donghua University | Wei S.,Anyang University, South Korea | Yu Y.,Donghua University | Zhou M.,Donghua University
Materials Letters | Year: 2010

Pure and Pd-doped ZnO nanofibers were synthesized by electrospinning method, and characterized via X-ray diffraction (XRD) and scanning electron microscopy (SEM). The diameters of the fibers annealed at 600 °C range from 70 to 160 nm. Compared with pure ZnO nanofiber sensor, the Pd-doped ZnO nanofiber sensor exhibits improved sensing properties to CO at 220 °C. Moreover, this sensor processes considerable sensitivity to low concentration CO in the range of 1-20 ppm with good selectivity. The response and recovery times are in the range of 25-29 s and 12-17 s, respectively. The sensing mechanism is also discussed. © 2010 Elsevier B.V.


Xu Y.,Anhui Agricultural University | Huang C.,Anhui Agricultural University | Wang X.,Donghua University
Carbohydrate Polymers | Year: 2013

For exploiting the novel multifunctional cotton fibers, a collagen protein modified cotton fiber (CPMCF) was prepared by the oxidation of cotton fiber with sodium periodate solution and subsequent crosslinking reaction with an aqueous solution of collagen protein in acetic acid. Infrared spectra and X-ray photoelectron spectrometry (XPS) analysis of the CPMCF illuminated that the CN double bond was formed through the imine reaction of the aldehyde group on oxidized cotton fiber with the amino group of collagen protein. X-ray diffractograms indicated that the crystallinity of the oxidized cotton fiber increased from 65.6 to 69.3% after collagen protein treatment. Scanning electron microscopy photographs displayed that the collagen protein combined on the surface of oxidized cotton fiber. The resulting optimum conditions to prepare the CPMCF achieved the sufficient aldehyde groups in oxidized cotton fiber and the collagen protein content on CPMCF, whereas the mechanical strength of the oxidized cotton fiber had no significant change. Meanwhile, a model experiment for the controlled release of aloe anthraquinone extract on CPMCF showed a satisfactory result compared with those release of the original cotton fiber, demonstrated potential application of the synthetic collagen protein-cotton fiber as a carrier for the sustained release of drugs. © 2012 Elsevier Ltd.


Wei S.,Donghua University | Wei S.,Anyang University, China | Zhou M.,Donghua University | Du W.,Donghua University
Sensors and Actuators, B: Chemical | Year: 2011

Solid and hollow ZnO nanofibers were fabricated through a facile single capillary electrospinning. The samples have been characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), and selected area electron diffraction (SAED). A comparative acetone sensing study between the two samples were also performed. The results indicate that the ZnO hollow nanofibers show improved response to acetone at 220 °C with good selectivity and stability, which is attributed to the 1D hollow nanostructure. Especially, the sensor can detect acetone down to 1 ppm with obvious response (7.1). The formation mechanism and acetone sensing mechanism of the ZnO hollow nanofibers were also discussed. © 2011 Elsevier B.V. All rights reserved.


Yang D.,Donghua University | Dong M.,Shanghai JiaoTong University
Advanced Engineering Informatics | Year: 2012

Product configuration is an essential means for selecting various components to constitute a customized product with the aim of meeting the individualized requirements of a customer. Nevertheless, configuration conflicts may occur when too strict requirements of the customer are given and thus any configuration cannot be found to satisfy the customer requirements. In this situation, it is vital important for a product configurator to recommend the corrective actions for generating valid configurations. In this paper, we present a method of applying constraint satisfaction to resolve product configuration conflicts. In the presented approach, the configuration conflict problem is encoded as a CSP (constraint satisfaction problem). Therefore, the resolution to the configuration conflict problem can be regarded as solving a CSP. As a consequence, corrective actions such as removing selected components or adding new components are suggested by the system. In the case of multiple resolving strategies, a multi-objective decision model is adopted to find the optimal repair strategy according to customer preferences. A computer configuration is illustrated to demonstrate the effectiveness of the presented approach. © 2012 Elsevier Ltd. All rights reserved.


Liu H.,Donghua University | Wang H.,Shanghai JiaoTong University | Xu Y.,Shanghai JiaoTong University | Shen M.,Donghua University | And 4 more authors.
Nanoscale | Year: 2014

Dendrimer-entrapped gold nanoparticles (Au DENPs) can be formed using low-generation dendrimers pre-modified by polyethylene glycol (PEG). The formed PEGylated Au DENPs with desirable stability, cytocompatibility, and X-ray attenuation properties enable efficient computed tomography imaging of the heart and tumor model of mice. © 2014 the Partner Organisations.


Li B.,Donghua University | Wang Q.,Donghua University | Wang Q.,Shanghai JiaoTong University | Zou R.,Donghua University | And 4 more authors.
Nanoscale | Year: 2014

Copper sulphides, as a novel kind of photothermal agent for photothermal therapy (PTT) of cancer cells, have attracted increasing attention in recent years due to good photostability, synthetic simplicity, low toxicity and low cost. However, the unsatisfactory photothermal conversion efficiency of copper sulphides limits their bioapplication as PTT agents. Herein, Cu 7.2S4 NCs with a mean size of ∼20 nm as a novel photothermal agent have been prepared by a simple thermal decomposition route. Moreover, these NCs exhibit strong near-infrared (NIR) absorption, good photostability and significant photothermal conversion efficiency up to 56.7% due to strong NIR absorption, good dispersity and suitable size. Importantly, these NCs can be very compatibly used as a 980 nm laser-driven PTT agent for the efficient PTT of cancer cells in vitro and in vivo. This journal is © The Royal Society of Chemistry.


Zhou Y.,Shanghai JiaoTong University | Li J.,Shanghai JiaoTong University | Wang D.,Donghua University
IEEE Signal Processing Letters | Year: 2010

We consider the problem of target tracking in a wireless sensor network (WSN) that consists of randomly distributed range-only sensors. Quantized measurements are usually adopted in such a network to attack the problem of limited power supply and communication bandwidth. Assuming that local sensor noises are mutually independent, we derive the posterior Cramér-Rao lower bound (CRLB) on the mean squared error (MSE) of target tracking in WSNs with quantized range-only measurements. Recursion of posterior CRLB on tracking based on both constant velocity (CV) and constant acceleration (CA) model for target dynamics and a general range-only measuring model for local sensors are obtained. Due to the analytical difficulties, particle filter is applied to approximate the theoretical bounds. To illustrate the posterior CRLB, an example on tracking a target with noisy circular trajectories is given. © 2009 IEEE.


Wang H.,Shanghai JiaoTong University | Zheng L.,Shanghai JiaoTong University | Peng C.,Donghua University | Guo R.,Donghua University | And 4 more authors.
Biomaterials | Year: 2011

We report a new use of acetylated dendrimer-entrapped gold nanoparticles (Au DENPs) for in vitro and in vivo computed tomography (CT) imaging of cancer cells. In this study, Au DENPs prepared using amine-terminated generation 5 poly(amidoamine) dendrimers were subjected to an acetylation reaction to neutralize the positive surface potential. The acetylated Au DENPs were used for both in vitro and in vivo CT imaging of a human lung adencarcinoma cell line (SPC-A1 cells). Micro-CT images show that SPC-A1 cells can be detected under X-ray after incubation with the acetylated Au DENPs in vitro and the xenograft tumor model can be imaged after both intratumoral and intraperitoneal administration of the particles. Transmission electron microscopy data further confirm that the acetylated Au DENPs are able to be uptaken dominantly in the lysosomes of the cells. Combined morphological observation of cells after hematoxylin and eosin staining, MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay of cell viability, and flow cytometric analysis of cell cycle show that the acetylated Au DENPs do not appreciably affect the cell morphology, viability, and cell cycle, indicating their good biocompatibility at the given concentration range. Findings from this study suggest that the developed acetylated Au DENPs have a great potential to be used for CT imaging of cancer cells. © 2011 Elsevier Ltd.


Zhao L.,Shanghai JiaoTong University | Shi X.,Donghua University | Shi X.,University of Madeira | Zhao J.,Shanghai JiaoTong University
Current Topics in Medicinal Chemistry | Year: 2015

This review reports the recent advances in chlorotoxin (CTX)-targeted nanoparticles (NPs) for imaging and therapy of glioma. CTX has been identified as a targeting ligand to specifically bind to glioma. Through different conjugation approaches, CTX can be conjugated onto iron oxide NPs, quantum dots, and rare-earth upconversion NPs for targeted magnetic resonance and fluorescence imaging of glioma. Likewise, CTX-conjugated NPs can also be used as a carrier system to load anticancer drugs or therapeutic genes for targeted chemotherapy or gene therapy of glioma, respectively. Some of the key developments in this area of research will be introduced in detail. Challenges and future perspectives in the development of CTX-conjugated NPs will be discussed. © 2015 Bentham Science Publishers.


Xu L.,Donghua University | Xu L.,Soochow University of China | Wu Y.,Shanghai University of Political Science and Law | Nawaz Y.,Donghua University
Computers and Mathematics with Applications | Year: 2011

In this paper, a discrete mathematical model of a magnetic electrospinning process is established and used to analyze numerically the effect of excitation current on electrospinning instability. The charged jet is assumed to be discrete electrified particles, which are joined by viscous flexible materials. The simulation results agree well with the experimental data and show that the magnetic approach provides an effective way to control instability. © 2010 Elsevier Ltd. All rights reserved.


Guo R.,Donghua University | Wang H.,Shanghai JiaoTong University | Peng C.,Donghua University | Shen M.,Donghua University | And 4 more authors.
Journal of Physical Chemistry C | Year: 2010

We report the X-ray attenuation property of dendrimer-entrapped gold nanoparticles (Au DENPs) that could be used as a computed tomography (CT) contrast agent. Amine-terminated generation 5 (G5.NH2) poly(amidoamine) dendrimers were used as templates to complex AuCl4 - ions for subsequent reductive formation of Au DENPs using sodium borohydride as a reducing agent. By varying the molar ratio between gold salt to G5.NH2, Au DENPs with a size range of 2-4 nm can be prepared. The formed Au DENPs are not only stable in water, PBS buffer, and cell culture media but also at different temperatures (from 4 to 50 °C) and different pH conditions (pH 5-8). X-ray absorption coefficient measurements show that the attenuation of Au DENPs is much higher than that of the iodine-based contrast agent at the same molar concentration of the active element (Au versus iodine). Furthermore, CT scanning showed significant enhancement at the point of mice injected subcutaneously with Au DENPs, and intravenous injection of acetylated Au DENPs enabled the X-ray CT imaging of mice, rendering them a promising contrast agent in CT imaging applications. © 2010 American Chemical Society.


He S.,Shanghai JiaoTong University | Xue G.,Donghua University
Journal of Hazardous Materials | Year: 2010

Algal-based immobilization process was applied to treat the effluent from a secondary wastewater treatment plant. Batch test proved that algae could attach onto fiber-bundle carrier in 7 days, and then the algal-based immobilization reactor could reduce TN (total nitrogen) and TP (total phosphorus) significantly within 48. h. Based on the above investigations, the hydraulic retention time (HRT) of the algal-based immobilization reactor in continuous operation mode was determined to be 2 days. During the 91 days of experiment on the treating secondary effluent of Guang-Rao wastewater treatment plant, it was found that the fiber-bundle carrier could collect the heterobacteria and nitrifying bacteria gradually, and thus improved the COD removal efficiency and nitrification performance step by step. Results of the continuous operation indicated that the final effluent could meet the Chinese National First A-level Sewage Discharge Standard when the algal-based immobilization reactor reached steady state. © 2010 Elsevier B.V.


Wang C.,Yancheng Institute of Technology | Wang C.,Donghua University | Qiu Y.,Donghua University
Journal of Applied Polymer Science | Year: 2012

The influence of processing parameters on wettability improvement and its uniformity of wool fabric treated by atmospheric pressure plasma jet (APPJ) was explored. A woven wool fabric was treated by APPJ under various treatment conditions such as different treatment time, different oxygen flow rate, and different jet-to-substrate distance. The water absorption time of wool fabric was measured to determine wettability improvement. The diffusion photo of water droplet on wool fabric surface was taken by digital camera to reflect wettability uniformity. After APPJ treatment, SEM observation showed that the scales on the wool fiber surface directly facing plasma jet pores were destroyed than those on the other fiber surface. XPS analysis showed that the carbon concentration substantially decreased. The concentration of oxygen and nitrogen significantly increased and but the concentration of sulfur and silicon did not obviously changed. With the addition of oxygen gas, more polar groups such as hydroxyl and carboxyl produced on wool fiber surface. The water absorption time of wool fabric greatly reduced indicating wettability improvement. The diffusion of water droplet on wool fabric surface was also larger and more homogenous suggesting uniform plasma treatment. It was concluded that the wettability improvement and its uniformity of the treated wool fabric increased and then decreased with the increasing oxygen flow rate and jet-to-substrate distance, and increased with the increasing treatment time. Therefore to achieve reasonable wettability and its uniformity of the wool fabric treated by APPJ, plasma treatment conditions have to be carefully chosen. © 2011 Wiley Periodicals, Inc.


Chen Z.,Donghua University | Chen Z.,Fudan University | Wang Q.,Shanghai JiaoTong University | Wang H.,Donghua University | And 7 more authors.
Advanced Materials | Year: 2013

A new photothermal coupling agent for photothermal ablation (PTA) therapy of tumors is developed based on ultrathin PEGylated W18O49 nanowires. After being injected with the nanowire solution, the in vivo tumors exhibit a rapid temperature rise to 50.0 ± 0.5 °C upon irradiation with NIR laser light at a safe, low intensity (0.72 W cm-2) for 2 min (left-hand mouse in the figure),), resulting in the efficient PTA of cancer cells in vivo in 10 min. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Li J.,Donghua University | Zheng L.,Shanghai JiaoTong University | Cai H.,Donghua University | Sun W.,Donghua University | And 4 more authors.
ACS Applied Materials and Interfaces | Year: 2013

A facile one-pot hydrothermal approach to synthesizing Fe3O 4@Au composite nanoparticles (CNPs) for dual-mode magnetic resonance (MR) and computed tomography (CT) imaging applications is reported. In this work, polyethyleneimine (PEI) partially modified with poly(ethylene glycol) monomethyl ether (mPEG) was used as a stabilizer to form gold NPs (mPEG-PEI.NH2-Au NPs) with the assistance of sodium borohydride reduction. The mPEG-PEI.NH2-Au NPs were then mixed with iron(II) salt in a basic aqueous solution followed by treatment under an elevated temperature and pressure. This hydrothermal process led to the formation of Fe 3O4@Au-mPEG-PEI.NH2 CNPs. The remaining PEI amine groups were finally acetylated to reduce the surface positive charge of the CNPs. The formed Fe3O4@Au-mPEG-PEI.NHAc (Fe 3O4@Au) CNPs were characterized via different techniques. The combined in vitro cell viability assay, cell morphology observation, flow cytometry, and hemolysis assay data show that the formed Fe3O 4@Au CNPs are noncytotoxic and hemocompatible in the given concentration range. MR and CT imaging data reveal that the formed Fe 3O4@Au CNPs have a relatively high r2 relaxivity (146.07 mM-1s-1) and good X-ray attenuation property, which enables their uses as contrast agents for MR imaging of mouse liver and CT imaging of rat liver and aorta. The Fe3O4@Au CNPs developed via the facile one-pot approach may have promising potential for the dual-mode MR/CT imaging of different biological systems. © 2013 American Chemical Society.


Wang H.,Shanghai JiaoTong University | Zheng L.,Shanghai JiaoTong University | Peng C.,Donghua University | Shen M.,Donghua University | And 3 more authors.
Biomaterials | Year: 2013

We report a new usage of folic acid-modified dendrimer-entrapped gold nanoparticles (Au DENPs-FA) as nanoprobes for in vitro and in vivo targeted computed tomography (CT) imaging of human lung adencarcinoma. In this study, Au DENPs prepared using amine-terminated generation 5 poly(amidoamine) dendrimers as templates were covalently linked with FA, followed by an acetylation reaction to neutralize the remaining dendrimer surface amines. The formed Au DENPs-FA was used for both in vitro and in vivo targeted CT imaging of human lung adencarcinoma cells (SPC-A1 cells) and the xenograft tumor model, which express folic acid receptors (FAR) verified by immunohistochemical staining. Micro-CT images show that SPC-A1 cells can be detected under X-ray after incubation with the Au DENPs-FA in vitro and the xenograft tumor model can be imaged after intravenous, intratumoral, and intraperitoneal administration of the particles. Transmission electron microscopy data confirm that the Au DENPs-FA is able to be uptaken dominantly in the lysosomes of the cells. Combined morphological observation of cells after Hematoxylin and Eosin staining, MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay of cell viability, and flow cytometric analysis of cell cycle and apoptosis show that the Au DENPs-FA does not affect cell morphology, viability, and cell cycle and apoptosis, indicating their good biocompatibility at the given concentration range. These findings suggest that the developed Au DENPs-FA have a great potential to be used as imaging probes for targeted CT imaging of human lung adencarcinoma. © 2012 Elsevier Ltd.


Hou C.,Donghua University | Quan H.,Donghua University | Duan Y.,Shanghai JiaoTong University | Zhang Q.,Donghua University | And 2 more authors.
Nanoscale | Year: 2013

We report a Cu2O nanocrystal-reduced graphene oxide hybrid that is dispersible in water and has anticancer activity under both visible and near-infrared light irradiation. In contrast to the highly efficient killing of both normal and cancer cells initiated by the photothermal effect, the photocatalytic effect of this material results in the selective killing of cancer cells under visible light irradiation. These results have implications for safe and widely applicable cancer therapy agents. © 2013 The Royal Society of Chemistry.


Wen S.,Donghua University | Li K.,Shanghai JiaoTong University | Cai H.,Donghua University | Chen Q.,Donghua University | And 8 more authors.
Biomaterials | Year: 2013

We report the synthesis, characterization, and utilization of gadolium-loaded dendrimer-entrapped gold nanoparticles (Gd-Au DENPs) for dual mode computed tomography (CT)/magnetic resonance (MR) imaging applications. In this study, amine-terminated generation five poly(amidoamine) dendrimers (G5.NH2) modified with gadolinium (Gd) chelator and polyethylene glycol (PEG) monomethyl ether were used as templates to synthesize gold nanoparticles (AuNPs). Followed by sequential chelation of Gd(III) and acetylation of the remaining dendrimer terminal amine groups, multifunctional Gd-Au DENPs were formed. The formed Gd-Au DENPs were characterized via different techniques. We show that the formed Gd-Au DENPs are colloidally stable and non-cytotoxic at an Au concentration up to 50 μm. With the coexistence of two radiodense imaging elements of AuNPs and Gd(III) within one NP system, the formed Gd-Au DENPs display both r1 relaxivity for MR imaging mode and X-ray attenuation property for CT imaging mode, which enables CT/MR dual mode imaging of the heart, liver, kidney, and bladder of rat or mouse within a time frame of 45 min. Furthermore, in vivo biodistribution studies reveal that the Gd-Au DENPs have an extended blood circulation time and can be cleared from the major organs within 24 h. The strategy to use facile dendrimer technology to design dual mode contrast agents may be extended to prepare multifunctional platforms for targeted multimode molecular imaging of various biological systems. © 2012 Elsevier Ltd.


Chen Q.,Donghua University | Li K.,Shanghai JiaoTong University | Wen S.,Donghua University | Liu H.,Donghua University | And 6 more authors.
Biomaterials | Year: 2013

We report the synthesis and characterization of folic acid (FA)-modified multifunctional dendrimer-entrapped gold nanoparticles (Au DENPs) loaded with gadolinium (Gd) for targeted dual mode computed tomography (CT)/magnetic resonance (MR) imaging of tumors. In this work, amine-terminated generation 5 poly(amidoamine) dendrimers (G5.NH2) modified with Gd(III) chelator, polyethylene glycol (PEG) monomethyl ether, and PEGylated FA were used as templates to entrap gold nanoparticles (AuNPs). Further chelation of Gd(III) ions and acetylation of the remaining dendrimer terminal amines led to the formation of multifunctional FA-targeted Au DENPs loaded with Gd(III) (Gd-Au DENPs-FA). The formed Gd-Au DENPs-FA probes were characterized via different techniques. We show that the Gd-Au DENPs-FA probes with an Au NP core size of 4.0 nm are water dispersible, stable under different pH and temperature conditions, and cytocompatible in the given concentration range. With the co-existence of AuNPs and Gd(III) ions within the single multifunctional particles, Gd-Au DENPs-FA displayed high X-ray attenuation intensity and reasonable r1 relaxivity. These properties of the particles enabled them to be used as dual mode nanoprobes for targeted CT/MR imaging of cancer cells in vitro and xenograft tumor model in vivo via FA receptor-mediated active targeting pathway. The strategy to design multifunctional nanoprobes using the versatile dendrimer nanotechnology may be extended to design various dual mode or multimode imaging agents for accurate diagnosis of different types of cancer. © 2013 Elsevier Ltd.


He X.,Donghua University | Chen W.,University of Wollongong
Physica A: Statistical Mechanics and its Applications | Year: 2014

In this paper, we consider the pricing of the CDS (credit default swap) under a GMFBM (generalized mixed fractional Brownian motion) model. As the name suggests, the GMFBM model is indeed a generalization of all the FBM (fractional Brownian motion) models used in the literature, and is proved to be able to effectively capture the long-range dependence of the stock returns. To develop the pricing mechanics of the CDS, we firstly derive a sufficient condition for the market modeled under the GMFBM to be arbitrage free. Then under the risk-neutral assumption, the CDS is fairly priced by investigating the two legs of the cash flow involved. The price we obtained involves elementary functions only, and can be easily implemented for practical purpose. Finally, based on numerical experiments, we analyze quantitatively the impacts of different parameters on the prices of the CDS. Interestingly, in comparison with all the other FBM models documented in the literature, the results produced from the GMFBM model are in a better agreement with those calculated from the classical Black-Scholes model. © 2014 Published by Elsevier B.V. All rights reserved.


Li J.,Donghua University | Zheng L.,Shanghai JiaoTong University | Cai H.,Donghua University | Sun W.,Donghua University | And 4 more authors.
Biomaterials | Year: 2013

We report a facile polyethyleneimine (PEI)-mediated approach to synthesizing folic acid (FA)-targeted magnetic iron oxide nanoparticles (Fe3O4 NPs) for invivo magnetic resonance (MR) imaging of tumors. In this study, stable PEI-coated Fe3O4 NPs were prepared by a one-pot hydrothermal route. The aminated Fe3O4 NPs with PEI coating enabled covalent conjugation of fluorescein isothiocyanate (FI) and folate-conjugated polyethylene glycol (PEG) with one end of carboxyl groups (FA-PEG-COOH). Followed by final acetylation, FA-targeted PEGylated Fe3O4 NPs (Fe3O4-PEI-Ac-FI-PEG-FA NPs) were formed. The formed multifunctional Fe3O4 NPs were characterized via different techniques. We show that the PEI-mediated approach along with the PEGylation conjugation enables the generation of water-dispersible and stable multifunctional Fe3O4 NPs, and the particles are quite cytocompatible and hemocompatible in the given concentration range as confirmed by invitro cytotoxicity assay, cell morphology observation, and hemolysis assay. In addition, flow cytometry and confocal microscopy data show that the multifunctional Fe3O4 NPs are able to target a model cancer cell line (KB cells) overexpressing FA receptors invitro. Importantly, the FA-targeted Fe3O4 NPs are able to be used as an efficient nanoprobe for MR imaging of cancer cells invitro and a xenografted tumor model invivo via an active FA targeting pathway. With the facile PEI-mediated formation strategy and PEGylation conjugation chemistry, the Fe3O4 NPs may be multifunctionalized with other biological ligands for MR imaging of different biological systems. © 2013 Elsevier Ltd.


Liu H.,Donghua University | Xu Y.,Shanghai JiaoTong University | Wen S.,Donghua University | Chen Q.,Donghua University | And 6 more authors.
Chemistry - A European Journal | Year: 2013

We report a facile approach to fabricating low-generation poly(amidoamine) (PAMAM) dendrimer-stabilized gold nanoparticles (Au DSNPs) functionalized with folic acid (FA) for in vitro and in vivo targeted computed tomography (CT) imaging of cancer cells. In this study, amine-terminated generation 2 PAMAM dendrimers were employed as stabilizers to form Au DSNPs without additional reducing agents. The formed Au DSNPs with an Au core size of 5.5 nm were covalently modified with the targeting ligand FA, followed by acetylation of the remaining dendrimer terminal amines to endow the particles with targeting specificity and improved biocompatibility. Our characterization data show that the formed FA-modified Au DSNPs are stable at different pH values (5 - 8) and temperatures (4-50°C), as well as in different aqueous media. MTT assay data along with cell morphology observations reveal that the FA-modified Au DSNPs are noncytotoxic in the particle concentration range of 0-3000 nM. X-ray attenuation coefficient measurements show that the CT value of FA-modified Au DSNPs is much higher than that of Omnipaque (a clinically used CT contrast agent) at the same concentration of the radiodense elements (Au or iodine). Importantly, the FA-modified Au DSNPs are able to specifically target a model cancer cell line (KB cells, a human epithelial carcinoma cell line) over-expressing FA receptors and they enable targeted CT imaging of the cancer cells in vitro and the xenografted tumor model in vivo after intravenous administration of the particles. With the simple synthesis approach, easy modification, good cytocompatibility, and high X-ray attenuation coefficient, the FA-modified low-generation Au DSNPs could be used as promising contrast agents for targeted CT imaging of different tumors over-expressing FA receptors. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Wei S.,Donghua University | Wei S.,Anyang University, China | Zhang Y.,Donghua University | Zhang Y.,Henan University of Urban Construction | Zhou M.,Donghua University
Solid State Communications | Year: 2011

SnO2ZnO hollow nanofibers were fabricated through a facile single capillary electrospinning technology. The structure and toluene sensing properties of the hollow fibers were investigated. The results indicated that the fibers possess a hollow structure, a rough porous surface after being annealed at 600 °C and the diameters are in the range of 80160 nm. A sensor fabricated from these fibers exhibits considerable sensitivity and good stability against toluene at 190 °C, which can be attributed to the special 1D hollow structure and the promoting effect of the SnO2ZnO heterojunction. The formation mechanism and toluene sensing mechanism of SnO2ZnO hollow nanofibers were also discussed. © 2011 Elsevier Ltd. All rights reserved.


Peng C.,Donghua University | Zheng L.,Shanghai JiaoTong University | Chen Q.,Donghua University | Shen M.,Donghua University | And 6 more authors.
Biomaterials | Year: 2012

We report the synthesis and characterization of dendrimer-entrapped gold nanoparticles (Au DENPs) modified by polyethylene glycol (PEG) with enhanced biocompatibility for computed tomography (CT) imaging applications. In this study, amine-terminated poly(amidoamine) dendrimers of generation 5 (G5.NH 2) modified by PEG monomethyl ether (G5.NH 2-mPEG 20) were used as templates to synthesize Au DENPs, followed by acetylation of the remaining dendrimer terminal amines to generate PEGylated Au DENPs. The partial PEGylation modification of dendrimer terminal amines allows high loading of Au within the dendrimer interior, and consequently by simply varying the Au salt/dendrimer molar ratio, the size of the PEGylated Au DENPs can be controlled at a range of 2-4 nm with a narrow size distribution. The formed PEGylated Au DENPs are water-dispersible, stable in a pH range of 5-8 and a temperature range of 0-50 °C, and non-cytotoxic at a concentration as high as 100 μm. X-ray absorption coefficient measurements show that the attenuation intensity of the PEGylated Au DENPs is much higher than that of Omnipaque with iodine concentration similar to Au. With the sufficiently long half-decay time demonstrated by pharmacokinetics studies, the PEGylated Au DENPs enabled not only X-ray CT blood pool imaging of mice and rats after intravenous injection of the particles, but also effective CT imaging of a xenograft tumor model in nude mice. These findings suggest that the designed PEGylated Au DENPs can be used as a promising contrast agent with enhanced biocompatibility for CT imaging of various biological systems, especially in cancer diagnosis. © 2011 Elsevier Ltd.


Ouyang Y.,Shanghai JiaoTong University | Huang C.,Donghua University | Zhu Y.,Shanghai JiaoTong University | Fan C.,Shanghai JiaoTong University | Ke Q.,Donghua University
Journal of Biomedical Nanotechnology | Year: 2013

An ideal nerve scaffold should supply structural guidance and trophic support to facilitate nerve regeneration. Aligned electrospun nanofibers have shown considerable promise for the precise guidance of regenerating axons in vitro and in vivo. Therefore, uniaxially aligned three-dimension (3D) nanofiberous scaffolds may allow regenerating axons to traverse large gaps to treat severe nerve injuries. However, the aligned 3D conduit was always rolled by an aligned 2-dimensional (2D) sheet in current fabrication methods, which was inconvenient for transplant due to the discontinuous joint and inconsistent size. We developed a modified one-step electrospinning technique to produce a seamless 3D nanofiberous nerve conduit (NC) with highly longitudinal aligned nanofibers that combines the biocompatibility of natural collagen and the strength of the synthetic polymer poly(lactic-co-glycolic acid) (PLGA). Scanning electron microscopy (SEM) confirmed the parallel alignment of the scaffold fibers. To test the effectiveness of these scaffolds at restoring neuronal connections, they were implanted into adult rats across a 13 mm sciatic nerve defect. Tests of motor function, nerve conduction, axonal and Schwann cell morphology, and marker expression all revealed that uniaxially aligned seamless 3D electrospun collagen/PLGA NCs were superior to randomly oriented NCs and inferior to autografts for promoting axon regeneration, myelination, action potential propagation, neuromuscular transmission, and functional recovery. These uniaxially aligned seamless 3D electrospun collagen/PLGA nerve guides can also incorporate signaling molecules and additional structural cues to guide nerve growth, and so may be a promising substitute for autogenous nerve grafts. Copyright © 2013 American Scientific Publishers All rights reserved.


Tao Z.,Yancheng Institute of Technology | Yan L.,University of Missouri | Qiao J.,Yancheng Institute of Technology | Qiao J.,Donghua University | And 4 more authors.
Progress in Materials Science | Year: 2015

Abstract This paper provides a comprehensive overview of developments and recent trends in H2 separation technology that uses dense proton-electron conducting ceramic materials and their associated membranes. Various proton-electron conducting materials and their associated membranes are summarized and classified into several important categories, such as Ni-composite proton-conducting materials, as well as tungstate-based, BaPrO3-based, LaGaO3-based, and niobate/tantalite composite metal oxide-based ceramic materials/membranes. Various membrane designs, including asymmetric ceramic membranes (supported and self-supported) and surface-modified membranes, are also reviewed. Several important properties of ceramic materials and membranes, such as proton and electron conductivity and performance (i.e., H2 transport flux and lifetime stability), are also discussed. To highlight the technical progress in this area, all possible ceramic materials and associated membranes are summarized, along with their properties and performance, to help readers quickly locate the information they are looking for. Based on this review, several challenges hindering the maturation of this technology are analyzed in depth, and possible research directions for overcoming these challenges are suggested. © 2015 Elsevier Ltd.


Yang D.,Donghua University | Dong M.,Shanghai JiaoTong University | Chang X.-K.,Shanghai JiaoTong University
Engineering Applications of Artificial Intelligence | Year: 2012

Configuring structured products poses new challenges to the solving technologies for product configuration. This paper presents a novel and direct approach to encoding configuration models into the Dynamic Constraint Satisfaction Problems (DCSP). In the presented approach, components are encoded as DCSP variables while structural relationships are represented as DCSP activity constraints. Furthermore, the configuration constraints such as the requisition and exclusion constraints are treated as DCSP compatibility constraints, which allow a low-level component to join in the solving process only after its high-level component is selected in the configuration. The presented method allows a more compact encoding representation, compared to CSP and generative CSP. Experimental study shows that the presented DCSP encoding approach makes a significant improvement in the performance of product configuration. © 2012 Elsevier Ltd. All rights reserved.


Wang Y.,Donghua University | Shi Z.,Shanghai JiaoTong University | Yu J.,Donghua University | Chen L.,Donghua University | And 2 more authors.
Carbon | Year: 2012

The extent of oxidation of graphite oxide (GO) was tailored by adjusting the amount of oxidant during oxidation. The characteristics of GOs with different degrees of oxidation and their corresponding exfoliated GO nanosheets (GONS) were investigated. It was found that the less oxidized GONS possessed 3-4 layers with much fewer structural defects. Mechanical testing of the resultant poly(vinyl alcohol)-based composites demonstrated that the less oxidized GONS was more effective than fully oxidized single-layered GONS in terms of reinforcing polymers. The reinforcement effect was discussed and confirmed by the Halpin-Tsai model. The results may provide an alternative for the fabrication of low-cost and high-performance graphene/polymer composites. © 2012 Elsevier Ltd. All rights reserved.


Tian Q.,Donghua University | Tang M.,Donghua University | Sun Y.,Donghua University | Zou R.,Donghua University | And 5 more authors.
Advanced Materials | Year: 2011

Hydrophilic flower-like CuS superstructures synthesized by a hydrothermal route can serve as an efficient 980 nm laser-driven photothermal agent for ablation of cancer cells, because the CuS superstructures exhibit greatly enhanced photothermal effects upon irradiation by a 980 nm laser. This finding demonstrates the great potential application of the CuS superstructures in the photothermal ablation of in vivo tumor tissues. Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Tian Q.,Donghua University | Jiang F.,Donghua University | Zou R.,Donghua University | Liu Q.,Donghua University | And 5 more authors.
ACS Nano | Year: 2011

Photothermal ablation (PTA) therapy has a great potential to revolutionize conventional therapeutic approaches for cancers, but it has been limited by difficulties in obtaining biocompatible photothermal agents that have low cost, small size (<100 nm), and high photothermal conversion efficiency. Herein, we have developed hydrophilic plate-like Cu 9S 5 nanocrystals (NCs, a mean size of ∼70 nm × 13 nm) as a new photothermal agent, which are synthesized by combining a thermal decomposition and ligand exchange route. The aqueous dispersion of as-synthesized Cu 9S 5 NCs exhibits an enhanced absorption (e.g., ∼1.2 × 10 9 M -1 cm -1 at 980 nm) with the increase of wavelength in near-infrared (NIR) region, which should be attributed to localized surface plasmon resonances (SPR) arising from p-type carriers. The exposure of the aqueous dispersion of Cu 9S 5 NCs (40 ppm) to 980 nm laser with a power density of 0.51 W/cm 2 can elevate its temperature by 15.1 °C in 7 min; a 980 nm laser heat conversion efficiency reaches as high as 25.7%, which is higher than that of the as-synthesized Au nanorods (23.7% from 980 nm laser) and the recently reported Cu 2-xSe NCs (22% from 808 nm laser). Importantly, under the irradiation of 980 nm laser with the conservative and safe power density over a short period (∼10 min), cancer cells in vivo can be efficiently killed by the photothermal effects of the Cu 9S 5 NCs. The present finding demonstrates the promising application of the Cu 9S 5 NCs as an ideal photothermal agent in the PTA of in vivo tumor tissues. © 2011 American Chemical Society.


Yang D.,Donghua University | Dong M.,Shanghai JiaoTong University
Journal of Intelligent Manufacturing | Year: 2013

In this paper, the product configuration problems that are characterized by cardinality-based configuration rules are dealt with. Novel configuration rules including FI and EI rules are presented to clarify the semantics of inclusion rules when cardinalities and hierarchies of products are encountered. Then, a configuration graph is proposed to visualize structural rules and configuration rules in product configuration problem. An encoding approach is elaborated to transform the configuration graph as a CSP (Constraint Satisfaction Problem). As a consequence, existing CSP solver, i.e. JCL (Java Constraint Library), is employed to implement the configuration system for product configuration problem with cardinality-related configuration rules. A case study of a bus configuration is used throughout this paper to illustrate the effectiveness of the presented approach. © 2011 Springer Science+Business Media, LLC.


Hu J.,Zhejiang Ocean University | Li N.,Donghua University | Liu X.,Nanjing University of Science and Technology | Zhang G.,Nanjing University of Science and Technology
Nonlinear Dynamics | Year: 2013

This paper is concerned with the sampled-data state estimation problem for a class of delayed neural networks with Markovian jumping parameters. Unlike the classical state estimation problem, in our state estimation scheme, the sampled measurements are adopted to estimate the concerned neuron states. The neural network under consideration is assumed to have multiple modes that switch from one to another according to a given Markovian chain. By utilizing the input delay approach, the sampling period is converted into a time-varying yet bounded delay. Then a sufficient condition is given under which the resulting error dynamics of the neural networks is exponentially stable in the mean square. Based on that, a set of sampled-data estimators is designed in terms of the solution to a set of linear matrix inequalities (LMIs) which can be solved by using the available software. Finally, a numerical example is used to show the effectiveness of the estimation approach proposed in this paper. © 2013 Springer Science+Business Media Dordrecht.


Ivlev A.V.,Max Planck Institute for Extraterrestrial Physics | Bartnick J.,Heinrich Heine University Düsseldorf | Heinen M.,Heinrich Heine University Düsseldorf | Heinen M.,California Institute of Technology | And 3 more authors.
Physical Review X | Year: 2015

There is a variety of situations in which Newton's third law is violated. Generally, the action-reaction symmetry can be broken for mesoscopic particles, when their effective interactions are mediated by a nonequilibrium environment. Here, we investigate different classes of nonreciprocal interactions relevant to real experimental situations and present their basic statistical mechanics analysis.We show that in mixtures of particles with such interactions, distinct species acquire distinct kinetic temperatures. In certain cases, the nonreciprocal systems are exactly characterized by a pseudo-Hamiltonian; i.e., being intrinsically nonequilibrium, they can nevertheless be described in terms of equilibrium statistical mechanics. Our results have profound implications, in particular, demonstrating the possibility to generate extreme temperature gradients on the particle scale. We verify the principal theoretical predictions in experimental tests performed with two-dimensional binary complex plasmas.


Wu B.H.,Donghua University | Yi W.,Anhui University of Science and Technology | Cao J.C.,CAS Shanghai Institute of Microsystem and Information Technology | Guo G.-C.,Anhui University of Science and Technology
Physical Review B - Condensed Matter and Materials Physics | Year: 2014

We show that noncollinear Andreev reflections can be induced at interfaces of semiconductor nanowires with spin-orbit coupling, Zeeman splitting, and proximity-induced superconductivity. In a noncollinear local Andreev reflection, the spin polarizations of the injected and the retro-reflected carriers are typically at an angle that is tunable via system parameters. While in a nonlocal transport, this noncollinearity enables us to identify and block, at different voltage configurations, the noncollinear cross Andreev reflection and the direct charge transfer processes. We demonstrate that the intriguing noncollinearity originates from the spin-dependent coupling between carriers in the lead and the lowest discrete states in the wire, which, for a topological superconducting nanowire, are related to the overlap-induced hybridization of Majorana edge states in a finite system. These interesting phenomena can be observed in semiconductor nanowires of experimentally relevant lengths, and are potentially useful for spintronics. © 2014 American Physical Society.


Si Y.,Donghua University | Wang X.,Donghua University | Li Y.,Donghua University | Chen K.,Donghua University | And 4 more authors.
Journal of Materials Chemistry A | Year: 2014

Creating a sensitive and selective method that can provide simple, practical and high-throughput determination of levels of Hg2+ ions in water has proved extremely challenging. This work responds to these challenges by designing, fabricating and evaluating a polyaniline (PANI) based immobilized sensor optimized to exhibit a colorimetric response to trace amount of Hg 2+ ions. The sensor design is realized using a leucoemeraldine based PANI as probe, which has a specific interaction with Hg2+ and results in both "off-on" and "color-change" signals. Hierarchical structured nanofibrous sensing membranes within well immobilized probes are fabricated by a bottom-up blending electrospinning nanofabrication method. This sensor shows a vivid colorimetric response specifically to Hg2+ ions (white-yellow/green-green-blue) over other possible interfering metal cations and achieves a low detection limit of 5 nM observed by the naked eye. Additionally, the sensing responses are visualized quantitatively by employing a colorimetric framework that translates measured spectra into numeric color values directly related to color perception. Furthermore, the as-prepared sensors exhibited good reversibility after extended regeneration cycles, which suggests a promising analytical method as an economical alternative to traditional Hg2+ sensors and also provides a new insight into the design and development of a novel colorimetric sensing system based on PANI immobilized materials. © 2014 The Royal Society of Chemistry.


Zhang W.,Donghua University | Tang Y.,Harbin Institute of Technology | Tang Y.,Humboldt University of Berlin | Tang Y.,Potsdam Institute for Climate Impact Research | And 2 more authors.
Neural Networks | Year: 2012

This paper addresses the stability problem of a class of delayed neural networks with time-varying impulses. One important feature of the time-varying impulses is that both the stabilizing and destabilizing impulses are considered simultaneously. Based on the comparison principle, the stability of delayed neural networks with time-varying impulses is investigated. Finally, the simulation results demonstrate the effectiveness of the results. © 2012 Elsevier Ltd.


Zhang W.,Donghua University | Tang Y.,Harbin Institute of Technology | Fang J.,Humboldt University of Berlin | Zhu W.,Potsdam Institute for Climate Impact Research
Chaos | Year: 2011

This paper investigates the problem of the exponential cluster synchronization of coupled impulsive genetic oscillators with external disturbances and communication delay. Based on the Kronecker product, some new cluster synchronization criteria for coupled impulsive genetic oscillators with attenuation level are derived. The derived results are related to the impulsive strength, and the derived results also indicate that the maximal allowable bound of time delay is inversely proportional to the decay rate, the decay rate is proportional to the couple strength, the maximal allowable bound of time delay is proportional to attenuation level, and the attenuation level is inversely proportional to the couple strength. Moreover, the case when the feedback have different self-delay is also investigated. Finally, numerical examples are given to illustrate the effectiveness of the derived results. © 2011 American Institute of Physics.


Zhang Y.,Donghua University | Zhang Y.,University of Aarhus | Thingholm B.,University of Aarhus | Goldie K.N.,University of Basel | And 2 more authors.
Langmuir | Year: 2012

Poly(dopamine) (PDA) coatings have recently attracted considerable interest for a variety of applications. Here, we investigate the film deposition of dopamine mixed with a nonionic polymer (i.e., poly(ethylene glycol) (PEG), poly(vinyl alcohol) (PVA), and poly(N-vinyl pyrrolidone) (PVP)) onto silica substrates using X-ray photoelectron spectroscopy and quartz crystal microbalance. Furthermore, we assess the possibility of coating silica colloids to yield polymer capsules and liposomes with these mixtures. We found that mixed PDA/PEG and PDA/PVA films are deposited without the need for a covalent linker such as an amine or thiol. We also discovered the first material, namely, PVP, that can suppress PDA film assembly. These fundamental findings give further insight into PDA film properties and contribute to establish PDA as a widely applicable coating. © 2012 American Chemical Society.


Peng Y.,Donghua University | Wang Z.,Nanjing Southeast University | Zou K.,Donghua University
Langmuir | Year: 2015

Friction and wear properties of graphene nanosheets prepared by different processes as solid lubricant on silicon dioxide have been comparatively studied via calibrated atomic force microscopy. The effects of normal load, humidity, and velocity on the friction were also investigated. All kinds of graphene nanosheets possess friction-reduction properties on the nanoscale. Mechanically exfoliated graphene nanosheets exhibit ultralubrication and zero wear under high pressure due to perfect graphitic structure and a hydrophobic surface. Defects in chemical vapor deposited graphene nanosheets decrease the antiwear and friction-reduction capability. The graphene oxide nanosheets (GOS) show the weakest friction-reduction properties on account of destroyed graphitic structure and a hydrophilic surface. The reduced graphene oxide nanosheets (RGOS) possess better friction reduction than GOS by virtue of hydrophobic surface properties. Both RGOS and GOS have weak antiwear properties due to the destroyed graphitic structure. Antiwear properties are correlated strongly with the structure, and friction depends mainly on the structure and surface properties. (Figure Presented). © 2015 American Chemical Society.


Xiaofeng L.,Donghua University | Wang M.,Zhejiang University | Zhang Z.,Beihang University
Journal of Mathematical Fluid Mechanics | Year: 2010

We consider the existence of the 2D inviscid Boussinesq equations in critical Besov spaces and obtain some blowup criteria. © 2009 Birkhäuser Verlag, Basel.


Wang L.,Shanghai Key Laboratory of Modern Optical Systems | Wei G.,Shanghai Key Laboratory of Modern Optical Systems | Shu H.,Donghua University
Neurocomputing | Year: 2013

In this paper, the H∞ state estimation problem is investigated for a class of discrete-time complex networks with randomly occurring phenomena. The proposed randomly occurring phenomena include both probabilistic missing measurements and randomly occurring coupling delays which are described by two random variable sequences satisfying individual probability distributions, respectively. Rather than the common Lipschitz-type function, a more general sector-like nonlinear function is employed to characterize the nonlinearities in the networks. The purpose of the addressed H∞ state estimation problem is to design a state estimator such that, for all admissible nonlinear disturbances, missing measurements as well as coupling delays, the dynamics of the augmented systems is guaranteed to be exponentially mean-square stable and attenuated to a given H∞ performance level. By constructing a novel Lyapunov-Krasovskii functional and utilizing convex optimization method as well as Kronecker product, we derive the sufficient conditions under which the desired state estimator exists. An illustrative example is exploited to show the effectiveness of the proposed state estimation scheme. © 2013 Elsevier B.V.


Wu B.H.,Donghua University | Cao J.C.,CAS Shanghai Institute of Microsystem and Information Technology | Timm C.,TU Dresden
Physical Review B - Condensed Matter and Materials Physics | Year: 2012

We study the interplay of polaronic effect and superconductivity in transport through molecular Josephson junctions. The tunneling rates of electrons are dominated by vibronic replicas of the superconducting gap, which show up as prominent features in the differential conductance for the dc and ac current. For relatively large molecule-lead coupling, a features that appears when the Josephson frequency matches the vibron frequency can be identified with an over-the-gap structure observed by Marchenkov. However, we are more concerned with the weak-coupling limit, where resonant tunneling through the molecular level dominates. We find that certain features involving both Andreev reflection and vibron emission show an unusual shift of the bias voltage V at their maximum with the gate voltage V g as V∼(2/3)V g. Moreover, due to the polaronic effect, the ac Josephson current shows a phase shift of π when the bias eV is increased by one vibronic energy quantum ω v. This distinctive even-odd effect is explained in terms of the different sign of the coupling to vibrons of electrons and of Andreev-reflected holes. © 2012 American Physical Society.


Shen B.,Donghua University | Wang Z.,Donghua University | Wang Z.,Brunel University | Liang J.,Nanjing Southeast University | Liu X.,Brunel University
International Journal of Robust and Nonlinear Control | Year: 2011

This paper is concerned with the sampled-data Hinfty filtering problem for a class of stochastic genetic regulatory networks with both extrinsic and intrinsic disturbances. The extrinsic disturbance and intrinsic noises are described, respectively, by an unknown signal with finite energy and a set of scalar Brownian motions. The expression levels of the mRNA and protein of the considered genetic regulatory network are sampled and then transmitted to the filter in order to estimate the states of the genetic network under consideration. The corresponding filtering error dynamics is then represented by means of a system with time-varying delay. By constructing a simple yet practical Lyapunov functional that reflects all the information about the system complexity, sufficient conditions are established so as to guarantee both the exponential mean-square stability and the H∞ performance for the filtering error dynamics. It is shown that the desired sampled-data H ∞ filter exists if certain matrix inequalities are solvable where the solvability can be readily checked by using the available software. Finally, a simulation example is employed to show the effectiveness of the filtering scheme proposed in this paper. Copyright © 2011 John Wiley & Sons, Ltd.


Wang Y.,Donghua University | Wang Z.,Brunel University | Liang J.,Nanjing Southeast University
IEEE Transactions on Systems, Man, and Cybernetics, Part B: Cybernetics | Year: 2010

Robust stability serves as an important regulation mechanism in system biology and synthetic biology. In this paper, the robust stability analysis problem is investigated for a class of nonlinear delayed genetic regulatory networks with parameter uncertainties and stochastic perturbations. The nonlinear function describing the feedback regulation satisfies the sector condition, the time delays exist in both translation and feedback regulation processes, and the state-dependent Brownian motions are introduced to reflect the inherent intrinsic and extrinsic noise perturbations. The purpose of the addressed stability analysis problem is to establish some easy-to-verify conditions under which the dynamics of the true concentrations of the messenger ribonucleic acid (mRNA) and protein is asymptotically stable irrespective of the norm-bounded modeling errors. By utilizing a new Lyapunov functional based on the idea of delay fractioning, we employ the linear matrix inequality (LMI) technique to derive delay-dependent sufficient conditions ensuring the robust stability of the gene regulatory networks. Note that the obtained results are formulated in terms of LMIs that can easily be solved using standard software packages. Simulation examples are exploited to illustrate the effectiveness of the proposed design procedures. © 2006 IEEE.


Yue R.-X.,Shanghai Normal University | Yue R.-X.,e-computing | Liu X.,Donghua University
Computational Statistics and Data Analysis | Year: 2010

Ir L-optimal designs are described for a kind of hierarchically ordered system of regression models with an r-dimensional response variable y. The components of y may be correlated with a known variance-covariance matrix Σ. The present results show that Ir L-optimal designs for this system of regression models do not depend on Σ. The Ir L-optimal designs are given for the systems of trigonometric and Haar wavelet regression models, respectively. © 2009 Elsevier B.V. All rights reserved.


Ding D.,Shanghai Key Laboratory of Modern Optical Systems | Wang Z.,Brunel University | Lam J.,University of Hong Kong | Shen B.,Donghua University
IEEE Transactions on Automatic Control | Year: 2015

This technical note deals with the H control problem for a class of discrete time-varying nonlinear systems with both randomly occurring nonlinearities and fading measurements over a finite-horizon. The system measurements are transmitted through fading channels described by a modified stochastic Rice fading model. The purpose of the addressed problem is to design a set of time-varying controllers such that, in the presence of channel fading and randomly occurring nonlinearities, the H performance is guaranteed over a given finite-horizon. The model transformation technique is first employed to simplify the addressed problem, and then the stochastic analysis in combination with the completing squares method are carried out to obtain necessary and sufficient conditions of an auxiliary index which is closely related to the finite-horizon H performance. Moreover, the time-varying controller parameters are characterized via solving coupled backward recursive Riccati difference equations (RDEs). A simulation example is utilized to illustrate the usefulness of the proposed controller design scheme. © 1963-2012 IEEE.


Li L.,Donghua University | Li L.,Catholic University of Leuven | Lomov S.V.,Catholic University of Leuven | Yan X.,Donghua University | Carvelli V.,Polytechnic of Milan
Composite Structures | Year: 2014

The goal of this work is to identify the best strategy for clustering of AE events, originated from damage initiation and development of 2D and 3D glass/epoxy woven composites loaded in tension. Two AE features - peak amplitude and peak frequency - were selected as the best cluster-definition features from nine AE parameters by (a) Laplacian score and correlation analysis, (b) principal component analysis and k-means++ algorithm and (c) repeatability and similarity analysis of the clusters in AE registration of different specimens. Peak amplitude and peak frequency represent adequately and in a reproducible way the AE events clustering for both 2D and 3D woven glass/epoxy composites, resulting in the clusters of similar shape. Cluster bounds are identified for different reinforcement type and different loading directions. The cluster identification creates a framework for analysis of a link between damage mode and AE parameters of the corresponding AE event. © 2014 Elsevier Ltd.


Ding D.,Shanghai Key Laboratory of Modern Optical Systems | Wang Z.,Brunel University | Shen B.,Donghua University | Dong H.,Northeast Petroleum University
Automatica | Year: 2015

In this paper, the envelope-constrained H∗ filtering problem is investigated for a class of discrete time-varying stochastic systems over a finite horizon. The system under consideration involves fading measurements, randomly occurring nonlinearities (RONs) and mixed (multiplicative and additive) noises. A novel envelope-constrained performance criterion is proposed to better quantify the transient dynamics of the filtering error process over the finite horizon. The purpose of the problem addressed is to design a time-varying filter such that both the H∗ performance and the desired envelope constraints are achieved at each time step. By utilizing the stochastic analysis techniques combined with the ellipsoid description on the estimation errors, sufficient conditions are established in the form of recursive matrix inequalities (RMIs) reflecting both the envelope information and the desired H∗ performance index. The filter gain matrix is characterized by means of the solvability of the deduced RMIs. Finally, a simulation example is provided to show the effectiveness of the proposed filtering design scheme. © 2015 Elsevier Ltd.


Zhang W.,Donghua University | Fang J.-A.,Donghua University | Tang Y.,Donghua University | Tang Y.,Potsdam Institute for Climate Impact Research
Neurocomputing | Year: 2011

This paper investigates the delay-probability-distribution-dependent stability problem of stochastic genetic regulatory networks (GRNs) with random discrete time delays and distributed time delays which exist in both translation process and feedback regulation process. The information of the probability distribution of the discrete time delays is considered and transformed into parameter matrices of the GRN models. By introducing a new Lyapunov functional which takes into account the ranges of delays and employing some free-weighting matrices, some new delay-probability-distribution-dependent stability criteria are established in the form of linear matrix inequalities (LMIs) to guarantee the GRNs to be asymptotically stable in the mean square. In addition, when estimating the upper bounds of the derivative of Lyapunov functionals, we carefully handle the additional useful terms about the distributed delays, which may lead to the less conservative results. The new criteria are applicable to both slow and fast time delays. Finally, numerical examples are given to illustrate the effectiveness of our theoretical results and less conservativeness of the proposed method. © 2011 Elsevier B.V.


Garg S.,University of Idaho | Gao H.,China Agricultural University | Joo Y.-H.,University of Idaho | Parrish D.A.,U.S. Navy | And 2 more authors.
Journal of the American Chemical Society | Year: 2010

The first silver-FOX, silver-ammonia-FOX, and silver-amine-FOX compounds were synthesized by the reactions of silver nitrate with K-FOX or guanidine-FOX in water, aqueous ammonia, and amines, respectively. The crystal structure of silver-ammonia-FOX exhibits unique covalent bonding behavior, which is supported by NBO calculations. © 2010 American Chemical Society.


Ding D.,Shanghai Key Laboratory of Modern Optical Systems | Wang Z.,Brunel University | Shen B.,Donghua University | Wei G.,Shanghai Key Laboratory of Modern Optical Systems
Automatica | Year: 2015

This paper is concerned with the event-triggered consensus control problem for a class of discrete-time stochastic multi-agent systems with state-dependent noises. A novel definition of consensus in probability is proposed to better describe the dynamics of the consensus process of the addressed stochastic multi-agent systems. The measurement output available for the controller is not only from the individual agent but also from its neighboring ones according to the given topology. An event-triggered mechanism is adopted with hope to reduce the communication burden, where the control input on each agent is updated only when a certain triggering condition is violated. The purpose of the problem under consideration is to design both the output feedback controller and the threshold of the triggering condition such that the closed-loop system achieves the desired consensus in probability. First of all, a theoretical framework is established for analyzing the so-called input-to-state stability in probability (ISSiP) for general discrete-time nonlinear stochastic systems. Within such a theoretical framework, some sufficient conditions on event-triggered control protocol are derived under which the consensus in probability is reached. Furthermore, both the controller parameter and the triggering threshold are obtained in terms of the solution to certain matrix inequalities involving the topology information and the desired consensus probability. Finally, a simulation example is utilized to illustrate the usefulness of the proposed control protocol. © 2015 Elsevier Ltd.


Zhu W.,Donghua University | Tang Y.,Harbin Institute of Technology | Tang Y.,Humboldt University of Berlin | Tang Y.,Potsdam Institute for Climate Impact Research | And 2 more authors.
Information Sciences | Year: 2013

Recently, various offspring generation strategies and parameter adaptation mechanisms have been developed to enhance the reliability and robustness of differential evolution (DE). However, the population size is generally fixed throughout the evolutionary search in most existing DE-variants, which leads to unsatisfactory performance. Based on the solution-searching status, in this paper, an adaptive population tuning scheme (APTS) for DE is proposed to dynamically adjust the population size. More specifically, on the basis of a ranking technique, a dynamic population strategy is adopted to remove redundant individuals from the population according to its ranking order. It is also applied to perturb the population and generate "fine" individuals. The proposed APTS is controlled by a status monitor, which is used to keep track of the progress of individuals and improve the performance of dynamic population strategy. In addition, this APTS framework is incorporated into several recently reported DE variants. The experimental results over 25 commonly used CEC2005 test functions demonstrate the effectiveness and usefulness of the proposed method. © 2012 Elsevier Inc. All rights reserved.


Hosta-Rigau L.,University of Aarhus | Zhang Y.,University of Aarhus | Zhang Y.,Donghua University | Teo B.M.,University of Aarhus | And 2 more authors.
Nanoscale | Year: 2013

Cholesterol is a molecule with many tasks in nature but also a long history in science. This feature article highlights the contribution of this small compound to bionanotechnology. We discuss relevant chemical aspects in this context followed by an overview of its self-assembly capabilities both as a free molecule and when conjugated to a polymer. Further, cholesterol in the context of liposomes is reviewed and its impact ranging from biosensing to drug delivery is outlined. Cholesterol is and will be an indispensable player in bionanotechnology, contributing to the progress of this potent field of research. © 2013 The Royal Society of Chemistry.


Wang D.,Donghua University | Wang D.,Linköping University | Tang O.,Linköping University | Zhang L.,Tongji University
International Journal of Production Economics | Year: 2014

This paper examines a periodic-reviewed lot sizing problem with random yields, disruptions and limited inventory capacity. To characterise the continuous production, an additive random yield model is considered rather than a multiplicative one. Disruptions cause breakdowns to production. Inventory capacity is included since the production has to be shut down when the inventory buffer is full. Both disruptions and shutdowns lead to a start-up cost and a stochastic lead time to recover the production. These compound factors of uncertainty are encountered in practical planning decisions in process industries. We review the existing random yield models, which are then compared with the additive model. With a linear production cost, the additive model has an order-up-to policy to be optimal. Disruptions deteriorate the expected actual production quantity and the fill-rate dramatically, even though the optimal order-up-to level increases compared with the cases of no disruption. Considering inventory capacity makes the problem to be a non-convex dynamic programming problem. Numerical analysis shows that the performance is dramatically deteriorated when the inventory capacity is rather tight, which indicates the importance of selecting a proper inventory capacity to reduce the negative impacts and avoid redundant investment on capacity. Moreover, the start-up cost plays an important role in determining the level of inventory capacity. © 2014 Elsevier B.V. All rights reserved.


Lin J.,Donghua University | Ding B.,Donghua University | Jianyong Yu.,Donghua University | Hsieh Y.,University of California
ACS Applied Materials and Interfaces | Year: 2010

A direct approach for fabricating nanoporous polymer fibers via electrospinning has been demonstrated. Polystyrene (PS) fibers with micro- and nanoporous structures both in the core and/or on the fiber surfaces were electrospun in a single process by varying solvent compositions and solution concentrations of the PS solutions. The porous structures of the fibrous mats were characterized by field emission scanning electron microscopy and Brunauer-Emmett-Teller measurements to confirm that they could be accurately controlled by tuning vapor pressure of tetrahydrofuran (THF) and N,N-dimethylformamide (DMF) solvent mixtures and PS concentrations in the solutions. As the solution concentration decreased, the average fiber diameter decreased, whereas the bead density increased dramatically to show a beads-on-string morphology. Both the specific surface area and pore volume of the fibrous mats showed a unimodal distributions centered at 1/3 THF /DMF mix ratio. Fibers formed from 5 wt%PS in the 1/3 THF and DMF mixtures had the largest specific surface area of 54.92 m2 g-1 and a pore volume of 0.318 cm3g-1, respectively. © 2010 American Chemical Society.


Liang J.,Nanjing Southeast University | Wang Z.,Brunel University | Shen B.,Donghua University | Liu X.,Brunel University
ACM Transactions on Sensor Networks | Year: 2012

This article is concerned with a new distributed state estimation problem for a class of dynamical systems in sensor networks. The target plant is described by a set of differential equations disturbed by a Brownian motion and randomly occurring nonlinearities (RONs) subject to time delays. The RONs are investigated here to reflect network-induced randomly occurring regulation of the delayed states on the current ones. Through available measurement output transmitted from the sensors, a distributed state estimator is designed to estimate the states of the target system, where each sensor can communicate with the neighboring sensors according to the given topology by means of a directed graph. The state estimation is carried out in a distributed way and is therefore applicable to online application. By resorting to the Lyapunov functional combined with stochastic analysis techniques, several delay-dependent criteria are established that not only ensure the estimation error to be globally asymptotically stable in the mean square, but also guarantee the existence of the desired estimator gains that can then be explicitly expressed when certain matrix inequalities are solved. A numerical example is given to verify the designed distributed state estimators. © 2012 ACM.


Lin J.,Donghua University | Wang X.,Donghua University | Ding B.,Donghua University | Yu J.,Donghua University | And 3 more authors.
Critical Reviews in Solid State and Materials Sciences | Year: 2012

Electrospinning, an efficient technique to produce long fibers with micro-or nanoscale diameters, has attracted tremendous interests during past decades. By orchestrating parameters in electrospinning, diverse forms of fibrous assemblies and individual fibers with hierarchical structures can be successfully achieved. Some of these versatile micro-and nanostructures display a remarkable resemblance to the materials and objects existing in nature, such as honeycomb, spider webs, extracellular matrix, plant tendril and leaf, etc. The emerging field of biomimicry enables one to mimic biology or nature to develop novel nanomaterials as well as to improve processes for materials via electrospinning. In this review, we present a full panorama of recent studies on biomimicry via electrospinning, and highlight some of biomimicked one-dimensional nanomaterials as well as their functions and applications to date. © 2012 Taylor and Francis Group, LLC.


Wang X.,Donghua University | Ding B.,Donghua University | Sun G.,Donghua University | Wang M.,Tsinghua University | Yu J.,Donghua University
Progress in Materials Science | Year: 2013

Since 2006, a rapid development has been achieved in a subject area, so called electro-spinning/netting (ESN), which comprises the conventional electrospinning process and a unique electro-netting process. Electro-netting overcomes the bottleneck problem of electrospinning technique and provides a versatile method for generating spider-web-like nano-nets with ultrafine fiber diameter less than 20 nm. Nano-nets, supported by the conventional electrospun nanofibers in the nano-fiber/nets (NFN) membranes, exhibit numerious attractive characteristics such as extremely small diameter, high porosity, and Steiner tree network geometry, which make NFN membranes optimal candidates for many significant applications. The progress made during the last few years in the field of ESN is highlighted in this review, with particular emphasis on results obtained in the author's research units. After a brief description of the development of the electrospinning and ESN techniques, several fundamental properties of NFN nanomaterials are addressed. Subsequently, the used polymers and the state-of-the-art strategies for the controllable fabrication of NFN membranes are highlighted in terms of the ESN process. Additionally, we highlight some potential applications associated with the remarkable features of NFN nanostructure. Our discussion is concluded with some personal perspectives on the future development in which this wonderful technique could be pursued. © 2013 Elsevier Ltd. All rights reserved.


Shao Y.,University of California at Los Angeles | Shao Y.,Donghua University | El-Kady M.F.,University of California at Los Angeles | El-Kady M.F.,Cairo University | And 7 more authors.
Chemical Society Reviews | Year: 2015

The demand for flexible/wearable electronic devices that have aesthetic appeal and multi-functionality has stimulated the rapid development of flexible supercapacitors with enhanced electrochemical performance and mechanical flexibility. After a brief introduction to flexible supercapacitors, we summarize current progress made with graphene-based electrodes. Two recently proposed prototypes for flexible supercapacitors, known as micro-supercapacitors and fiber-type supercapacitors, are then discussed. We also present our perspective on the development of graphene-based electrodes for flexible supercapacitors. © The Royal Society of Chemistry 2015.


Wang X.,Donghua University | Ding B.,Donghua University | Yu J.,Donghua University | Wang M.,Tsinghua University | And 2 more authors.
Nano Today | Year: 2011

Biomimetics provides a model for developments of functional surfaces with special wettability. Recently, manufacturing bio-inspired superhydrophobic surfaces has become an increasingly hot research topic. The electrospinning technique is a versatile and effective method for manufacturing nanomaterials with controllable compositions and structures, and therefore provides an ideal strategy for construction of superhydrophobic surfaces on a large scale. After a brief description of several superhydrophobic surfaces inspired by nature, we highlighted the recent progresses in design and fabrication of these bio-inspired superhydrophobic surfaces via electrospinning technique. The studies on the switchable wettability of nanofibrous surface brought about by external stimuli are also addressed. We conclude with a summary of current and future research efforts and opportunities in the development of electrospun nanomaterials for superhydrophobic applications. © 2011 Elsevier Ltd.


Wang L.,Donghua University | Zhang J.,Tohoku University | Jiang W.,Donghua University
International Journal of Refractory Metals and Hard Materials | Year: 2013

As a relatively novel sintering technique, spark plasma sintering (SPS) has been used extensively over the past decade to prepare a wide variety of materials, e.g., ceramics, composites, cermets, metals and alloys. Many applications of the SPS technique are the fabrication of nanostructured materials using nanosize powdered precursors as starting materials. This article provides a review of research activities that concentrate on the development of the SPS reaction sintering (SPS-RS) to produce dense nanostructured materials, which indicate that it is possible to synthesize and compact dense bulk materials with controlled sub-micron or even nanoscale grain sizes by the use of the SPS technique. © 2013 Elsevier Ltd. All rights reserved.


Feng Y.,Max Planck Institute for Plasma Physics (Garching) | Lunt T.,Max Planck Institute for Plasma Physics (Garching) | Sardei F.,Max Planck Institute for Plasma Physics (Garching) | Zha X.,Donghua University
Computer Physics Communications | Year: 2013

The paper presents a numerical technique for modeling "trace" impurity transport in the scrape-off-layer (SOL) and core regions by implicit coupling of a three-dimensional (3D) edge Monte Carlo code like EMC3-Eirene Feng et al. (2004) [4], Reiter et al. (2005) [6] to a one-dimensional (1D) core model handled by a finite difference method. For given core plasma and transport coefficient profiles, certain types of particular solutions to the 1D model are pre-calculated under specific boundary conditions at the SOL-core interface. Linear combination of these solutions yields a general solution, which is then translated into "Monte Carlo language" by formulating a so-called "charge state transition probability" matrix. This matrix provides definitive boundary conditions at the SOL-core interface so that a self-consistent solution for both SOL and core is achievable without the need for SOL-core iteration. © 2013 Elsevier B.V. All rights reserved.


Cao X.,Donghua University | Ding B.,Donghua University | Ding B.,Wuhan Textile University | Yu J.,Donghua University | Al-Deyab S.S.,King Saud University
Carbohydrate Polymers | Year: 2012

Cellulose nanowhiskers is a kind of renewable and biocompatible nanomaterials evoke much interest because of its versatility in various applications. Here, for the first time, a novel controllable fabrication of cellulose nanowhiskers from jute fibers with a high yield (over 80%) via a 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO)/NaBr/NaClO system selective oxidization combined with mechanical homogenization is reported. The versatile jute cellulose nanowhiskers with ultrathin diameters (3-10 nm) and high crystallinity (69.72%), contains C6 carboxylate groups converted from C6 primary hydroxyls, which would be particularly useful for applications in the nanocomposites as reinforcing phase, as well as in tissue engineering, pharmaceutical and optical industries as additives. © 2012 Elsevier Ltd. All rights reserved.


Zhang W.,Yangzhou University | Tang Y.,Humboldt University of Berlin | Wu X.,Anhui Polytechnic University | Fang J.-A.,Donghua University
IEEE Transactions on Circuits and Systems I: Regular Papers | Year: 2014

In this paper, the synchronization problem is investigated for a class of nonlinear delayed dynamical networks with heterogeneous impulsive effects. The intrinsic properties of heterogeneous impulses are that impulsive strengths are inhomogeneous in both time and space domains, i.e., the impulsive effect in each node is not only nonidentical from each other, but also time-varying at different impulsive instants. The purpose of the addressed problem is to derive synchronization criteria such that, the nonlinear delayed dynamical networks with heterogeneous impulses can be synchronized to a desired state. By means of a time-dependent Lyapunov function and the comparison principle, several sufficient conditions are established under which nonlinear dynamical networks with heterogeneous impulsive effects are exponentially synchronized to a desired state. An example is given to show the effectiveness of the proposed results. © 2004-2012 IEEE.


Ding Y.-S.,Donghua University | Hu Z.-H.,Donghua University | Hu Z.-H.,Shanghai Maritime University | Zhang W.-B.,Donghua University
Expert Systems with Applications | Year: 2011

In this paper, we propose a co-evolutionary immune algorithm for the multi-criteria decision making (MCDM) model, and use the model to solve the large scale garment matching problem. Size fitting problem is a main obstacle to large scale garment sales and online sales because it is difficult to find the fit garments by the general size information. This study regards the fit garment matching problem as a MCDM model with the constraints of size satisfaction. An immune co-evolutionary algorithm is used to search the fit garments from the candidate garments in the stock. The garments in the stock are taken as antibodies and the customer request as antigen. The concepts of ideal garment and loose garment are virtual garment to model the customer request. Two affinity measures including dominance affinity and distance affinity are defined to represent the similarity of antibody to antibody and that of antibody to antigen. Correspondingly, the fit garments are chosen by two methods: the Pareto optimal garments by the MCDM solving algorithm, and the optimal garments with the minimal distance affinity to the ideal garments. An evaluation model on garments is proposed to evaluate the fit garments by the affinity measures. Based on the experiment data from the effective study of detail factors of female trousers, the proposed model and algorithm demonstrate to be a feasible and effective attempt aiming at a valuable problem and provide the key tool for garment store sale system or online garment order system to support accurate garment size matching. © 2011 Published by Elsevier Ltd.


Li X.-G.,Tongji University | Li A.,Tongji University | Li A.,University of California at Los Angeles | Huang M.-R.,Tongji University | And 3 more authors.
Journal of Physical Chemistry C | Year: 2010

Pure polypyrrole (PPy) nanoparticles that are well-applicable for nanocomposite and nanocarbon precursor were productively synthesized by necessarily unstirred oxidative polymerization of pyrrole in acidic aqueous media at 0 °C without any template. The species and concentration of acid and oxidant have been carefully investigated to optimize the polymerization yield, conjugated structure, size, and conductivity of the PPy particles. Laser particle-size analysis, field-emission scanning electron microscopy, transmission electron microscopy, and atomic force microscopy all revealed that the PPy particles produced in still acid media have narrow size distribution and uniform spheroid morphology. Homogeneous nucleation and static repulsion are proposed as the formation and self-stabilization mechanisms of the PPy nanoparticles. Combination of HNO3 medium and (NH4) 2S2O8 oxidant is optimal for the synthesis of PPy nanoparticles possessing maximal yield of 87.2%, small diameter, and high conductivity which has been confirmed by a strong UV-vis band due to a large π-conjugated chain structure. This quiescent polymerization could be simply scaled up or down to synthesize a larger or smaller amount of PPy nanoparticles without compromising their yield, structure, and properties. Furthermore, the conductivity of the nano-PPy could reach 2.8 S/cm upon doping in 2.0 M HClO 4. Simultaneous thermogravimetry-differential thermal analysis technique demonstrates that the PPy nanoparticles at 1000 °C can be efficiently carbonized into carbon nanoparticles with narrower size distribution, smaller diameter of 62 nm, and much higher conductivity of about 21 S/cm. In particular, the conductivity will dramatically be enhanced to 219 S/cm and even 370 S/cm at the carbonization and graphitization temperatures of 1300 and 2300 °C in nitrogen and argon, respectively. A conductive nano-PPy/cellulose diacetate nanocomposite film with low percolation threshold down to 0.2 wt %, good conductivity stability for at least 8 weeks, and potential bioapplicability was simply fabricated. The present synthesis requires no external templates and provides a facile and direct route to scalable synthesis of PPy exclusive nanoparticles with high yield, controllable size, strong re-dispersibility, high purity, adjustable conductivity, and high nanocarbon yield. © 2010 American Chemical Society.


Hu J.,Harbin Institute of Technology | Hu J.,Harbin University of Science and Technology | Wang Z.,Harbin University of Science and Technology | Wang Z.,Tsinghua University | And 3 more authors.
IEEE Transactions on Signal Processing | Year: 2013

This paper is concerned with the gain-constrained recursive filtering problem for a class of time-varying nonlinear stochastic systems with probabilistic sensor delays and correlated noises. The stochastic nonlinearities are described by statistical means that cover the multiplicative stochastic disturbances as a special case. The phenomenon of probabilistic sensor delays is modeled by introducing a diagonal matrix composed of Bernoulli distributed random variables taking values of 1 or 0, which means that the sensors may experience randomly occurring delays with individual delay characteristics. The process noise is finite-step autocorrelated. The purpose of the addressed gain-constrained filtering problem is to design a filter such that, for all probabilistic sensor delays, stochastic nonlinearities, gain constraint as well as correlated noises, the cost function concerning the filtering error is minimized at each sampling instant, where the filter gain satisfies a certain equality constraint. A new recursive filtering algorithm is developed that ensures both the local optimality and the unbiasedness of the designed filter at each sampling instant which achieving the pre-specified filter gain constraint. A simulation example is provided to illustrate the effectiveness of the proposed filter design approach. © 1991-2012 IEEE.


Shen J.,CAS Shanghai Institutes for Biological Sciences | Song G.,Donghua University | An M.,CAS Shanghai Institutes for Biological Sciences | Li X.,Xuhui Central Hospital | And 4 more authors.
Biomaterials | Year: 2014

Bortezomib (BTZ) is the first clinically approved proteasome inhibitor for treating multiple human malignancies. However, the poor water-solubility and low stability of BTZ and the emergence of tumor resistance have severely restrained its therapeutic efficacy. Herein, we report the application of hollow mesoporous silica nanospheres (HMSNs) in encapsulating BTZ for drug delivery. In invitro cell viability assay on human NSCLC H1299 cells, the half-maximum inhibiting concentration (IC50) of HMSNs-BTZ was 42% of that for free BTZ in 48h treatments. Invivo tumor-suppression assay further indicated that HMSNs-BTZ (0.3mg/kg) showed approximately 1.5 folds stronger anti-tumor activity than free BTZ. Furthermore, we report that more potent induction of cell cycle arrest and apoptotic cell death, along with promoted activation of Caspase 3 and autophagy might mechanistically underlie the improved anti-tumor efficacy of HMSNs-BTZ. Finally, the tumor-suppressing effect of HMSNs-BTZ was enhanced in the presence of wild-type p53 signaling, suggesting a potential enhancement in clinical efficacy with combined p53 gene therapy and BTZ-based chemotherapy. Therefore, the HMSNs-based nanoparticles are emerging as a promising platform to deliver therapeutic agents for beneficial clinical outcomes through lowering doses and frequency of drug administration and reducing potential side effects. © 2013 Elsevier Ltd.


Cai G.M.,Wuhan Textile University | Yu W.D.,Wuhan Textile University | Yu W.D.,Donghua University
Journal of Thermal Analysis and Calorimetry | Year: 2011

The thermal degradation behaviors of Kevlar 49, Kevlar 129 (Poly(p-phenylene terephthamide), Nomex (polyisophthaloyl metaphenylene diamine), and PBO (poly(p-phenylene benzobisoxazole)) fibers were measured by TG/FTIR and Py-GC/MS. The characteristic temperatures of the fibers in air were obtained by TG. It indicated that the initial degradation temperature of the PBO is the highest. The initial degradation temperature of Nomex fiber is the lowest, but the end decomposition temperature of Nomex is the highest. The gases released by the pyrolysis in air were mainly CO2, CO, H 2O, NO, and HCN, also containing a small amount of NH3, and the absorption peaks of CO2 were the strongest. The results of Py-GC/MS showed that CO2 and benzene were the most pyrolysis fragment. With the change of pyrolysis temperature, the chromatogram and mass spectra results take a large variety. The pyrolysates can help us to study the pyrolysis process of high performance fibers. © 2011 Akadémiai Kiadó, Budapest, Hungary.


Qiao J.,Donghua University | Liu Y.,Tohoku University | Hong F.,Donghua University | Zhang J.,Donghua University | Zhang J.,National Research Council Canada
Chemical Society Reviews | Year: 2014

This paper reviews recent progress made in identifying electrocatalysts for carbon dioxide (CO2) reduction to produce low-carbon fuels, including CO, HCOOH/HCOO-, CH2O, CH4, H 2C2O4/HC2O4-, C2H4, CH3OH, CH3CH2OH and others. The electrocatalysts are classified into several categories, including metals, metal alloys, metal oxides, metal complexes, polymers/clusters, enzymes and organic molecules. The catalyts' activity, product selectivity, Faradaic efficiency, catalytic stability and reduction mechanisms during CO2 electroreduction have received detailed treatment. In particular, we review the effects of electrode potential, solution-electrolyte type and composition, temperature, pressure, and other conditions on these catalyst properties. The challenges in achieving highly active and stable CO2 reduction electrocatalysts are analyzed, and several research directions for practical applications are proposed, with the aim of mitigating performance degradation, overcoming additional challenges, and facilitating research and development in this area. © The Royal Society of Chemistry.


Wang L.,Wayne State University | Rege M.,Rochester Institute of Technology | Dong M.,Wayne State University | Ding Y.,Donghua University
IEEE Transactions on Knowledge and Data Engineering | Year: 2012

Traditional clustering techniques are inapplicable to problems where the relationships between data points evolve over time. Not only is it important for the clustering algorithm to adapt to the recent changes in the evolving data, but it also needs to take the historical relationship between the data points into consideration. In this paper, we propose ECKF, a general framework for evolutionary clustering large-scale data based on low-rank kernel matrix factorization. To the best of our knowledge, this is the first work that clusters large evolutionary data sets by the amalgamation of low-rank matrix approximation methods and matrix factorization-based clustering. Since the low-rank approximation provides a compact representation of the original matrix, and especially, the near-optimal low-rank approximation can preserve the sparsity of the original data, ECKF gains computational efficiency and hence is applicable to large evolutionary data sets. Moreover, matrix factorization-based methods have been shown to effectively cluster high-dimensional data in text mining and multimedia data analysis. From a theoretical standpoint, we mathematically prove the convergence and correctness of ECKF, and provide detailed analysis of its computational efficiency (both time and space). Through extensive experiments performed on synthetic and real data sets, we show that ECKF outperforms the existing methods in evolutionary clustering. © 1989-2012 IEEE.


Hu W.,University of California at Los Angeles | Hu W.,Donghua University | Niu X.,University of California at Los Angeles | Zhao R.,University of California at Los Angeles | Pei Q.,University of California at Los Angeles
Applied Physics Letters | Year: 2013

Highly flexible transparent capacitive sensors have been demonstrated for the detection of deformation and pressure. The elastomeric sensors employ a pair of compliant electrodes comprising silver nanowire networks embedded in the surface layer of polyurethane matrix, and a highly compliant dielectric spacer sandwiched between the electrodes. The capacitance of the sensor sheets increases linearly with strains up to 60% during uniaxial stretching, and linearly with externally applied transverse pressure from 1 MPa down to 1 kPa. Stretchable sensor arrays consisting of 10 × 10 pixels have also been fabricated by patterning the composite electrodes into X-Y addressable passive matrix. © 2013 American Institute of Physics.


Qiao J.,Donghua University | Fu J.,Donghua University | Liu L.,Donghua University | Liu Y.,Tohoku University | Sheng J.,Zhejiang University
International Journal of Hydrogen Energy | Year: 2012

Highly stable hydroxyl anion conducting membranes have been developed using poly(vinyl alcohol) (PVA) as matrix by incorporation of poly(acrylamide-co- diallyldimethylammonium chloride) (PAADDA) as anion charge carriers. In order to clarifying the cross-linking effect on membrane performances, two series of PVA/PAADDA membranes were prepared by direct and indirect chemical cross-linking ways, and have been characterized in detail at structural and hydroxyl ion (OH -) conducting property by FTIR spectroscopy, thermal gravity analysis (TG), scanning electron microscopy (SEM), water sorption, ion exchange capacity and alkaline resistance stability. The OH - conductivity of the membranes increased with increasing the content of PAADDA in polymer and temperature, and reached 0.74-12 mS cm -1 with direct cross-linking way and 0.66-7.1 mS cm -1 with indirect cross-linking way in the temperature range 30-90°C. The membranes are found to have the same IEC values but the membranes with direct cross-linking way showed higher water uptake than that with indirect cross-link one. Both membranes showed the thermal stability above 200°C, and can integrity in 100°C hot water and methanol solution, where the swelling are better suppressed as high dense chemical cross-linkages in PVA network. Very low methanol permeability (from 1.82 × 10 -7 to 3.03 × 10 -7 cm 2 s -1) in 50% methanol solution was obtained at 30°C. Besides, the chemical stability in 80°C, 6 M hot alkali conditions and long-term stability of 350 h in 60°C hot water revealed that the PVA/PAADDA membranes are promising for potential application in alkaline fuel cells. Copyright © 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.


Shang Y.,Donghua University | Si Y.,Donghua University | Raza A.,Donghua University | Yang L.,Donghua University | And 4 more authors.
Nanoscale | Year: 2012

Superhydrophobic and superoleophilic nanofibrous membranes exhibiting robust oil-water separation performance were prepared by a facile combination of electrospun cellulose acetate (CA) nanofibers and a novel in situ polymerized fluorinated polybenzoxazine (F-PBZ) functional layer that incorporated silica nanoparticles (SiO2 NPs). By employing the F-PBZ/SiO2 NPs modification, the pristine hydrophilic CA nanofibrous membranes were endowed with a superhydrophobicity with the water contact angle of 161°and a superoleophilicity with the oil contact angle of 3°. Surface morphological studies have indicated that the wettability of resultant membranes could be manipulated by tuning the surface composition as well as the hierarchical structures. The quantitative hierarchical roughness analysis using the N 2 adsorption method has confirmed the major contribution of SiO 2 NPs on enhancing the porous structure, and a detailed correlation between roughness and solid-liquid interface pinning is proposed. Furthermore, the as-prepared membranes exhibited fast and efficient separation for oil-water mixtures and excellent stability over a wide range of pH conditions, which would make them a good candidate in industrial oil-polluted water treatments and oil spill cleanup, and also provided a new insight into the design and development of functional nanofibrous membranes through F-PBZ modification. This journal is © 2012 The Royal Society of Chemistry.


Huang J.,Donghua University | Xu W.,Donghua University | Xu W.,Wuhan Textile University
Applied Surface Science | Year: 2010

A new zwitterionic surface was obtained by a novel three-step grafting procedure. The zwitterionic monomer was introduced by cerium-induced graft copolymerization in the presence of N,N′-methylene bisacrylamide (MBAA) as cross-linking agent. Attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR) and X-ray photoelectron spectroscopy (XPS) analysis confirmed the MBAA could stimulate zwitterionic monomer grafting onto the membrane surface. Surface properties were also determined by atomic force microscope (AFM) and water contact angle. The hemocompatibility of the modified PU membranes was evaluated by the activated partial thromboplastin time (APTT), thrombin time (TT) and prothrombin time (PT). The TT and APTT of PU were significantly prolonged by the zwitterion of sulfobetaine monomer grafting copolymerization. The new polyurethane membrane could have a great potential in biomedical applications. © 2010 Elsevier B.V. All rights reserved.


Wang Z.,Tsinghua University | Wang Z.,Brunel University | Dong H.,Northeast Petroleum University | Dong H.,University of Duisburg - Essen | And 2 more authors.
IEEE Transactions on Automatic Control | Year: 2013

In this paper, a new H∞ filtering approach is developed for a class of discrete time-varying systems subject to missing measurements and quantization effects. The missing measurements are modeled via a diagonal matrix consisting of a series of mutually independent random variables satisfying certain probabilistic distributions on the interval [0,1]. The measured output is quantized by a logarithmic quantizer. Attention is focused on the design of a stochastic H∞ filter such that the H∞ estimation performance is guaranteed over a given finite-horizon in the simultaneous presence of probabilistic missing measurements, quantization effects as well as external non-Gaussian disturbances. A necessary and sufficient condition is first established for the existence of the desired time-varying filters in virtue of the solvability of certain coupled recursive Riccati difference equations (RDEs). Owing to its recursive nature, the proposed RDE approach is shown to be suitable for online application without the need of increasing the problem size. The simulation experiment is carried out for the mobile robot localization problem with non-Gaussian disturbances, missing measurements and quantization effects. The effectiveness of the proposed method is demonstrated in the numerical example. © 1963-2012 IEEE.


Huang J.,Donghua University | Xu W.,Donghua University | Xu W.,Wuhan Textile University
Journal of Applied Polymer Science | Year: 2011

A novel polyurethane material containing zwitterionic sulfobetaine groups has been synthesized using the copper-catalyzed 1,3-dipolar cycloaddition (azide-alkyne click chemistry). A standard two-step polyaddition method was used to produce the well-defined polyurethane based on polycarbonatediol (PCDL) with alkyne groups. These polyurethanes containing alkyne units were then efficiently clicked using 3-((2-azidoethyl)dimethylammonio)propane-1-sulfonate (DMPS-N3). The novel PU material was characterized by 1H NMR, Fourier transform infrared (FTIR) spectrometer, gel permeation chromatography (GPC), elemental analysis, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and dynamic mechanical analysis (DMA). This facile "click" reaction provides a useful tool for the development of novel functional polyurethanes for biomedical applications. © 2011 Wiley Periodicals, Inc.


Wang J.,Donghua University | Raza A.,Donghua University | Si Y.,Donghua University | Cui L.,Donghua University | And 4 more authors.
Nanoscale | Year: 2012

Superamphiphobic nanofibrous membranes exhibiting robust water/oil proof and breathable performances were prepared by the combination of a novel synthesized fluorinated polyurethane (FPU) containing a terminal perfluoroalkane segment and incorporated SiO2 nanoparticles (SiO2 NPs). By employing the FPU/SiO2 NPs incorporation, the hybrid membranes possess superhydrophobicity with a water contact angle of 165°and superoleophobicity with an oil contact angle of 151°. Surface morphological studies have indicated that the wettability of resultant membranes could be manipulated by tuning the surface composition as well as the hierarchical structures. The quantitative hierarchical roughness analysis using N2 adsorption method has confirmed a major contribution of SiO2 NPs on enhancing the porous structure, and a detailed correlation between the fractal dimension and amphiphobicity is proposed. Furthermore, a designed concept test shows that the as-prepared membranes could load 1.5 kg water or oil at the same time maintained an extremely high air permeability of 2 L min-1, suggesting their use as promising materials for a variety of potential applications in protective clothing, bioseparation, water purification, tissue engineering, microfluidic systems, etc., and also provided new insight into the design and development of functional hybrid membranes based on FPU. © 2012 The Royal Society of Chemistry.


Zhang J.,Donghua University | Qiao J.,Donghua University | Jiang G.,Donghua University | Jiang G.,University of Waterloo | And 3 more authors.
Journal of Power Sources | Year: 2013

The novel, low-cost anion-exchange membranes (abbreviated as PVA/PDDA-OH-), made from poly(vinyl alcohol) and poly(diallyldimethylammonium chloride) blends, are successfully synthesized by a combined thermal and chemical cross-linking technique. The hydroxide (OH -) conductivity, water uptake, ion exchange capacity (IEC), thermal stability, oxidative stability and alkaline stability of PVA/PDDA-OH- membranes are measured to evaluate their applicability in alkaline fuel cells. The effects of cross-linking procedure, cross-linking time and membrane composition on OH- conductivity are studied using AC impedance technique. It is found that by cross-linking modifications, the membranes exhibit excellent thermal stability with onset degradation temperature high above 170 C, a relatively high oxidative stability at 60 C, and a strong alkaline stability in 8 M KOH at 80 C. High OH- conductivity of 0.025 S cm-1 is achieved at 25 C and reaches up to 0.037 S cm-1 at 80 C. For exploring the conducting mechanisms, the concentration and mobility of charge carries of the membranes are also measured. The H 2/O2 fuel cell tests with PVA/PDDA-OH- membranes yield the peak power density of 11.5 mW cm-2 and greatly increase to 35.1 mW cm-2 depending on PVA/PDDA mass ratio, on a low metal loading on both the anode and the cathode of 0.5 mg (Pt) cm-2 at ambient temperature. © 2013 Elsevier B.V. All rights reserved.


Fan Y.,Tohoku University | Estili M.,Japan National Institute of Materials Science | Igarashi G.,Tohoku University | Jiang W.,Donghua University | Kawasaki A.,Tohoku University
Journal of the European Ceramic Society | Year: 2014

Fully dense few-layer graphene (FG)/Al2O3 nanocomposites with homogeneously dispersed FG in matrix are prepared by using a heteroaggregation method followed by spark plasma sintering. It is found that the two dimensional FG has great ability to restrain grain growth in comparison to other inclusions. In addition, the morphology of grain in composite is modified by the addition of FG during densification process compared with monolithic alumina. Thanks to the greatly decreased grain size, the composites are almost as hard as monolithic alumina at low sintering temperature (1573K) even if graphene content is as high as 1.2vol.%. However, at higher sintering temperature (1673K), the hardness of composites decreases further but the change in elastic modulus is very limited. The decline of hardness and elastic modulus mainly arises from the sliding feature of FG, low modulus of reduced graphene oxide in both in-plane and out-of-plane directions. © 2013 Elsevier Ltd.


Fan Y.,Tohoku University | Jiang W.,Donghua University | Kawasaki A.,Tohoku University
Advanced Functional Materials | Year: 2012

An ex situ strategy for fabrication of graphene oxide (GO)/metal oxide hybrids without assistance of surfactant is introduced. Guided by this strategy, GO/Al 2O 3 hybrids are fabricated by two kinds of titration methods in which GO and Al 2O 3 colloids are utilized as titrant for hybrids of low and high GO content respectively. After sintered by spark plasma sintering, few-layer graphene (FG)/Al 2O 3 nanocomposites are obtained and GO is well reduced to FG simultaneously. A percolation threshold as low as 0.38 vol.% is achieved and the electrical conductivity surpasses 10 3 Sm -1 when FG content is only 2.35 vol.% in FG/Al 2O 3 composite, revealing the homogeneous dispersion and high quality of as-prepared FG. Furthermore, it is found that the charge carrier type changes from p- to n-type as graphene content becomes higher. It is deduced that this conversion is related to the doping effect induced by Al 2O 3 matrix and is thickness-dependent with respect to FG. © 2012 WILEY-VCH Verlag erlag GmbH & Co. KGaA, Weinheim.


Zhu Q.,Donghua University | Gao Q.,Dymatic Chemicals Inc. | Guo Y.,Dymatic Chemicals Inc. | Yang C.Q.,University of Georgia | Shen L.,Donghua University
Industrial and Engineering Chemistry Research | Year: 2011

The applications of water-resistant and stain-resistant finishes to apparel have become widespread in recent years due to high consumer demand. In our previous research, we studied the formation of highly hydrophobic surfaces on cotton and polyester fabrics using a two-step treatment procedure, i.e., first forming silica sol by hydrolysis and subsequent condensation of tetraethoxysilane under alkaline conditions, applying the sol to the surfaces of cotton and polyester fabrics, and then applying hydrolyzed hexadecyltrimethoxysilane on the treated fabrics to impart hydrophobicity to the surfaces of the fabrics. In this research, we developed a novel one-step procedure to form highly hydrophobic surfaces on cotton and polyester fabrics using different modified silica sols. The first series of modified silica sol ("sol A") was prepared by the reactions of a sol formed by alkaline hydrolysis of tetraethoxysilane and alkyltrialkoxysilanes in a NH 4OH-ethanol solution. A second series ("sol B") was prepared by the reactions of a sol formed by the same method, followed by adding (3-glycidyloxypropyl)trimethoxysilane and alkyltrialkoxysilanes to the sol. The cotton and polyester fabrics treated with the two modified silica sol systems showed excellent water repellency with the water contact angle above 150° on cotton and above 140° on polyester under the optimum treatment conditions. The treated cotton and polyester had significantly improved hydrolysis resistance and maintained high levels of hydrophobicity after 30 laundering cycles. © 2011 American Chemical Society.


Shen B.,Donghua University | Ding S.X.,University of Duisburg - Essen | Wang Z.,Tsinghua University | Wang Z.,Brunel University
IEEE Transactions on Circuits and Systems II: Express Briefs | Year: 2013

In this brief, the finite-horizon H∞ fault estimation problem is investigated for a class of uncertain linear discrete time-varying systems with known inputs. A new H\infty performance index including the known inputs is put forward in order to better reflect the effect of the known input on the whole fault estimation systems. To cope with the uncertainties, an auxiliary system is constructed with a certain indefinite quadratic form. By recurring to the Krein-space theory, the optimization problem of the associated indefinite quadratic form is solved, and a sufficient condition with much less conservativeness is established for the existence of the desired fault estimator. Then, all the estimator parameters are derived simultaneously in terms of an explicit solution to a matrix equation. Finally, an illustrative numerical example is employed to demonstrate the effectiveness of the proposed fault estimation scheme. © 2004-2012 IEEE.


Hu W.,University of California at Los Angeles | Hu W.,Donghua University | Niu X.,University of California at Los Angeles | Li L.,University of California at Los Angeles | And 3 more authors.
Nanotechnology | Year: 2012

Stretchable transparent composites have been synthesized consisting of a silver nanowire (AgNW) network embedded in the surface layer of a crosslinked poly(acrylate) matrix. The interpenetrating networks of AgNWs and the crosslinked polymer matrix lead to high surface conductivity, high transparency, and rubbery elasticity. The presence of carboxylic acid groups on the polymer chains enhances the bonding between AgNWs and the polymer matrix, and further increases the stretchability of the composites. The sheet resistance of the composite electrode increases by only 2.3 times at 50% strain. Repeated stretching to 50% strain and relaxation only causes a small increase of the sheet resistance after 600 cycles. The morphology of the composites during reversible stretching and relaxation has been investigated to expound the conductivity changes. © 2012 IOP Publishing Ltd.


Hu W.,University of California at Los Angeles | Hu W.,Donghua University | Wang R.,University of California at Los Angeles | Lu Y.,University of California at Los Angeles | Pei Q.,University of California at Los Angeles
Journal of Materials Chemistry C | Year: 2014

An elastomeric transparent composite electrode has been fabricated comprising a percolation network of copper nanowires (CuNWs) embedded in the surface layer of an elastomeric polyurethane (PU) matrix. The composite electrode was fabricated by first forming a highly conductive CuNW network on glass, then overcoating with a layer of a liquid polyurethane precursor which was subsequently polymerized, and finally peeling off the resulting PU sheet. The composite retained the elastomeric stretchability of the polymer matrix. Pre-treatment of the CuNW network with 6-aminohexanoic acid enhanced the bonding between nanowires and PU matrix, and significantly improved the reversibility of the surface conductance of the composite electrode during repeated stretching at room temperature. The composite electrodes exhibited a low sheet resistance of <102 Ω sq-1 at tensile strains up to 60%. High stretchability was obtained in a wide range of strain rates over 200 cycles of stretching. Morphological development during the stretching-releasing processes was consistent with the important role of the bonding between the nanowires and the PU matrix in the stretchability of the composite electrode. © 2014 The Royal Society of Chemistry.


Si Y.,Donghua University | Ren T.,Donghua University | Li Y.,Donghua University | Ding B.,Donghua University | And 2 more authors.
Carbon | Year: 2012

Hierarchical porous, magnetic Fe 3O 4@carbon nanofibers (Fe 3O 4@CNFs) based on polybenzoxazine precursors have been synthesized by a combination of electrospinning and in situ polymerization. The benzoxazine monomers could easily form thermosetting nanofibers by in situ ring-opening polymerization and subsequently be converted into CNFs by carbonization. The resultant fibers with an average diameter of 130 nm are comprised of carbon fibers with embedded Fe 3O 4 nanocrystals, and could have a high surface area of 1885 m 2 g -1 and a porosity of 2.3 cm 3 g -1. Quantitative pore size distribution and fractal analysis were used to investigate the hierarchical porous structure using N 2 adsorption and synchrotron radiation small-angle X-ray scattering measurements. The role of precursor composition and activation process for the effects of the porous structure is discussed, and a plausible correlation between surface fractal dimension and porous parameter is proposed. The Fe 3O 4@CNFs exhibit efficient adsorption for organic dyes in water and excellent magnetic separation performance, suggesting their use as a promising adsorbent for water treatment, and also provided new insight into the design and development of a carbon nanomaterial based on a polybenzoxazine precursor. © 2012 Elsevier Ltd. All rights reserved.


Xiao S.,Wuhan Textile University | Xu W.,Wuhan Textile University | Ma H.,Donghua University | Fang X.,Donghua University
RSC Advances | Year: 2012

We report a facile method to immobilizing silver nanoparticles (AgNPs) into electrospun polymer nanofibers. In this approach, water-stable polyacrylic acid (PAA)/polyvinyl alcohol (PVA) nanofibers, fabricated by electrospinning a 10 wt% PAA/PVA solution and subsequent heating treatment at 145 °C for 30 min, were used as nanoreactors to complex Ag(i) ions through binding with carboxyl groups of PAA for the subsequent reductive formation of AgNPs. The as-prepared AgNP-immobilized nanofibers are thoroughly characterized by scanning electronic microscopy, transmission electron microscopy, energy dispersive spectroscopy, selected area electron diffraction, Fourier transform infrared spectroscopy, and thermogravimetric analysis. Moreover, the effect of AgNO 3 solution concentration on the morphology of hybrid nanofibers, Ag content, the size of AgNPs, and catalytic activity of hybrid nanofibrous mats are systematically investigated. We show that spherical AgNPs are uniformly distributed along the cross-section of nanofibers. X-Ray diffraction indicates that the formed AgNPs in the nanofibers are crystalline. The AgNP-immobilized nanofibrous mats exhibit superior catalytic reduction capacity to 4-nitrophenol with efficiency approaching 100% within 30 min and excellent reusability. Furthermore, the size and spacial distribution of AgNPs can be tuned by varying the AgNO 3 solution concentration, thus manipulating the catalytic activity of AgNP-immobilized nanofibrous mats. The strategy to immobilizing and manipulating the size of the AgNPs within polymer nanofibers may be extended to other particle systems for various applications in catalysis, energy, sensing, photonic and biomedical applications. © 2012 The Royal Society of Chemistry.


News Article | October 10, 2016
Site: www.rdmag.com

Silk derived from the pint-sized silkworm is being explored as a viable component to build a new wave of wearable devices or tactical clothing. One project in particular is testing one way to engineer this durable, tensile material in order to create a slew of super-strong products. Researchers hailing from China’s Tsinghua University and Donghua University fed these insects a diet of single-walled carbon nanotubes and graphene, reported Scientific American. The worms ate a diet of mulberry leaves sprayed with an aqueous solutions that contained either 0.2 percent of carbon nanotubes or graphene. As a result of this feeding process, the worm’s spun silk that was twice as strong as traditional silk and could withstand about 50 percent more stress. Heating these new fibers up to 1,050 degrees Celsius carbonized them, enabling them to conduct electricity too. Donghua University material scientist Yaopeng Zhang, Ph.D., told Scientific American this technique provides an, “easy way to produce high-strength silk fibers on a large scale.” Some potential applications for this product could include sensors for reading nerve signals, but more research needs to be conducted in order to understand how the worms incorporate this graphene into the silk along with deciding what percentage comes out as waste or gets metabolized. Other scientists are also testing synthetic silk’s properties. The Army gave a $1 million grant to Kraig Biocraft Laboratories over the summer so they could genetically engineer another form of silk for a new type of body armor.


News Article | October 12, 2016
Site: www.techtimes.com

Graphene - Here's What You Should Know Nanotechnology - What You Should Know The prospects for producing stronger silk fibers like carbon-reinforced silk on a mass basis have brightened. This follows the success reported by Chinese researchers in producing carbon-reinforced silk by feeding silkworms with mulberry leaves that were dipped in a solution containing the wonder material: graphene. The tests for making carbon-reinforced silk were conducted by Yingying Zhang and her colleagues at Tsinghua University. They fed single-walled carbon nanotubes and graphene to Bombyx mori larval silkworms. "We report mechanically enhanced silk directly collected by feeding ... silkworms with single-walled carbon nanotubes and graphene. We found that parts of the fed carbon nanomaterials were incorporated into the as-spun silk fibers," wrote the authors in their research published in the journal Nano Letters. According to industry experts, the material produced has amazing applications including biodegradable medical implants and wearable electronics. Silk is already a lustrous clothing material and very tough too. The graphene experiment has proved that there is a smarter way to make the gossamer threads stronger by graphene infusion in the feed. To test the properties, the team heated the silk fibers at 1,050 °C to carbonize the silk and examined the conductivity. It was found that the modified silks can conduct electricity. Detailed spectroscopy and microscopy imaging showed that the carbon-enhanced silk fibers possessed an ordered crystal structure thanks to the incorporation of nanomaterials. Pyrolysis of modified silk confirmed a highly developed graphitic structure with higher conductivity of electricity. Detailed spectroscopy showed the changes. Nano-carbon infusion was seen blocking transition of silk fibroin from a random coil, α-helix to β-sheet. This further facilitated greater elongation. Compared to regular silk, the carbon-reinforced silk had a higher endurance of more than 50 percent for stress and breakage with better conductivity for electricity after heating to a range of 1,050 °C. Materials scientist Yaopeng Zhang of Donghua University hailed the method as the "easy way to produce high-strength silk fibers on a large scale." Zhang has been a veteran in the silkworms sector and he also once fed titanium dioxide nanoparticles to make silkworms' threads resistant to ultraviolet degradation. He said carbon-reinforced silk would prove apt for sensors in smart textiles to trace nerve signals. While highlighting the potential of carbon-reinforced silk, researcher Zhang pointed to the challenges as well. There is the issue of carbon materials not showing up in the cross sections of the silk threads because of the low volume of the nanoparticle content. However, there is a consensus that this method is lucrative, unlike treating spun silk in nanomaterials by using toxic chemical solvents. The feeding method is surely simpler and environmentally friendly. © 2017 Tech Times, All rights reserved. Do not reproduce without permission.


News Article | October 13, 2016
Site: cleantechnica.com

Spidey is notoriously close-lipped about the formula of his webbing, and it looks like the folks over at China’s Tsinghua University have a silkworm version of the mystery on their hands. A research team at the school has been doping their silkworms’ meals with graphene and carbon nanotubes to engineer amped-up silk threads that are twice as strong as ordinary silk — and yet, neither the graphene nor the nanotubes show up when the threads are examined. According to our friends over at Chemical and Engineering News, the idea of modding out silkworm threads at the source is not new: Researchers have previously added dyes, antimicrobial agents, conductive polymers, and nanoparticles to silk — either by treating spun silk with the additives or, in some cases, by directly feeding the additives to silkworms. A couple of years ago, a research team at Donghua University also reported good results with silkworms that digested carbon nanotubes. The new Tsinghua University research fine-tunes that effort by using graphene and smaller, single-walled nanotubes of 1-2 nanometers wide (the Donghua team used 30-nm wide, multi-walled nanotubes). In contrast to regular silk, the carbon-enhanced silks are twice as tough and can withstand at least 50% higher stress before breaking. The modified silks conduct electricity, unlike regular silk. Raman spectroscopy and electron microscopy imaging showed that the carbon-enhanced silk fibers had a more ordered crystal structure due to the incorporated nanomaterials. The study, published in the journal Nano Letters, explains the effect of the nano-bits of carbon on the formation of silk: Spectroscopy study indicated that nanocarbon additions hindered the conformation transition of silk fibroin from random coil and α-helix to β-sheet, which may contribute to increased elongation at break and toughness modules. The carbon does not show up in the silk. However, it does come out in the silkworms’ excretions, so go figure. If you would like to DIY this at home, order up some Bombyx mori larval silkworms  and mulberry leaves and have a go at it. Don’t over-stuff your little charges on carbon, though. To get the silkworms to digest their enhancers, the team used a solution containing no more than 0.2 percent graphene or carbon nanotubes, which they sprayed onto the leaves. Meanwhile, a research team over here in the US has come up with a graphene angle that could dovetail with the silkworm study. Working with Lockheed Martin Space Systems, researchers at Oak Ridge National Laboratory in Tennessee have hit upon a method for controlling defects in graphene and other 2-D materials (for those of you new to the topic, graphene is an atom-thin but super-strong (and weirdly electronic) form of carbon with a structure that resembles chickenwire). So, imagine if you could feed graphene to silkworms that is precisely engineered to achieve certain desirable effects in silk. What those might be, we don’t know. If you have an idea, drop us a note in the comment thread. For now, the Oak Ridge research team is looking at deploying fine-tuned graphene and other 2-D materials for energy storage and water desalination, among other uses. Here’s corresponding author Adri van Duin, cited by Oak Ridge: As long as you can control defects, you might be able to synthesize in whatever response the graphene will give you. But that does require that you have very good control over defect structure and defect behavior. As van Duin notes, this is just the first step. The potential for controlling defects in graphene was revealed by a modeling technique that he co-invented, called ReaxFF: [It] is capable of predicting the interactions of thousands of atoms when they are perturbed by an external force, in this case the bombardment of graphene by atoms of a noble gas. If you’re wondering what that looks like in graphene, here’s an snippet of an illustration from van Duin’s page at the Penn State College of Engineering: A simulation shows the path for the collision of a krypton ion (blue) with a defected graphene sheet and subsequent formation of a carbon vacancy (red). Red shades indicate local strain in the graphene. And, here’s how the folks at Oak Ridge depict it: As for Spiderman’s silk envy, hold on to your hats. Marvel introduced the character Silk into its universe just a couple of years ago, and it looks like she’s already heading for the big screen. Follow me on Twitter and Google+. Images: Top by Clara Jordan via flickr.com, creative commons license; middle (cropped) by Kichel Yoon via Penn State College of Engineering; bottom via Oak Ridge National Laboratory. Buy a cool T-shirt or mug in the CleanTechnica store!   Keep up to date with all the hottest cleantech news by subscribing to our (free) cleantech daily newsletter or weekly newsletter, or keep an eye on sector-specific news by getting our (also free) solar energy newsletter, electric vehicle newsletter, or wind energy newsletter.


Ma G.,Donghua University | Ma G.,University of Michigan | Zhou Y.,University of Michigan | Li X.,University of Michigan | And 6 more authors.
ACS Nano | Year: 2013

Copper chalcogenide nanoparticles (NPs) represent a promising material for solar energy conversion, electrical charge storage, and plasmonic devices. However, it is difficult to achieve high-quality NP dispersions in experimentally convenient and technologically preferred aqueous media. Also problematic is the transition from NP dispersion to continuously crystalline nanoscale materials, for instance, nanowires, nanoribbons, or similar high aspect ratio nano/microstructures capable of charge transport necessary for such applications. All previous examples of copper sulfide assemblies contained insulating gaps between NPs. Here we show that aqueous synthesis of high-quality monodispersed high-chalcocite β-Cu2S NPs, with sizes from 2 to 10 nm, is possible. When reaction time increased, the NP shape evolved from nearly spherical particles into disks with predominantly hexagonal shape. Moreover, the monodispersed β-Cu2S NPs were found to spontaneously self-assemble into nanochains and, subsequently, to nanoribbons. The width and length of the nanoribbons were 4-20 nm and 50-950 nm, respectively, depending on the assembly conditions. We observed the formation of the nanoribbons with continuous crystal lattice and charge transport pathways, making possible the utilization of self-assembly processes in the manufacturing of photovoltaic, plasmonic, and charge storage devices. © 2013 American Chemical Society.


Xu Z.,Hiroshima University | Xu Z.,Donghua University | Nakamura K.,Hiroshima University | Timerbaev A.R.,RAS Vernadsky Institute of Geochemistry and Analytical Chemistry | Hirokawa T.,Hiroshima University
Analytical Chemistry | Year: 2011

Electrokinetic supercharging (EKS) is a powerful and practical method for multifold in-line concentration of various analytes prior to capillary electrophoresis (CE) analysis. However, a problem of insufficient sensitivity has always existed when trace analyte quantification by EKS-CE is a target, especially when coupled with conventional detectors. Normally this requires a greatly increased amount of analyte injected without separation degradation. In this contribution, we have shown that it is possible to substantially improve analyte loading and hence CE method detectability by modifying sample introduction configuration. The volume of sample vial was increased (from typical 500 μL to 17 mL), the common wire electrode was replaced by a ring electrode, and the sample solution was stirred. With these alterations, more analyte ions are accumulated within the effective electric field during electrokinetic injection and then maintained as focused zones due to transient isotachophoresis. The versatility of the customized EKS-CE approach for sample concentration was demonstrated for a mixture of seven rare-earth metal ions with an enrichment factor of 500 000 giving detection limits at or below 1 ng/L. These detection limits are over 100 000 times better than can be achieved by normal hydrodynamic injection, 1000 times better than the sensitivity thresholds of inductively coupled plasma atomic emission spectrometry (ICP-AES), and even close to those of inductively coupled plasma mass spectrometry (ICPMS). © 2010 American Chemical Society.


Li X.,Donghua University | Wang C.,Donghua University | Yang Y.,Donghua University | Wang X.,Donghua University | And 2 more authors.
ACS Applied Materials and Interfaces | Year: 2014

A new type of dual-biomimetic hierarchically rough polystyrene (PS) superhydrophobic micro/nano-fibrous membrane was fabricated via a one-step electrospinning technique at various polymer concentrations from 15 to 30 wt %. The obtained micro/nano-fibers exhibited a nanopapillose, nanoporous, and microgrooved surface morphology that originated from mimicking the micro/nanoscale hierarchical structures of lotus leaf and silver ragwort leaf, respectively. Superhydrophobicity and high porosity of such resultant electrospun nanofibrous membranes make them attractive candidates for membrane distillation (MD) application with low energy water recovery. In this study, two kinds of optimized PS nanofibrous membranes with different thicknesses were applied for desalination via direct contact MD. The membranes maintained a high and stable permeate water vapor flux (104.8 ± 4.9 kg/m 2·h, 20 g/L NaCl salt feed for a thinner PS nanofibrous membrane with thickness of 60 μm; 51 ± 4.5 kg/m2·h, 35 g/L NaCl salt feed for the thicker sample with thickness of 120 μm; ΔT = 50°C) for a test period of 10 h without remarkable membrane pores wetting detected. These results were better than those of typical commercial polyvinylidene fluoride (PVDF) MD membranes or related PVDF nanofibrous membranes reported in literature, suggesting excellent competency of PS nanofibrous membranes for MD applications. © 2014 American Chemical Society.


Yang S.-D.,Wuhan University of Science and Technology | Yi Y.-L.,Central China Normal University | Shan Z.-Y.,Donghua University
Procedia Engineering | Year: 2011

Chemical reaction(ACR) optimization algorithm invented recently by Bilal Alatas is a heuristics algorithm. However, there is still an insufficiency in ACR algorithm regarding its solution search equation, which is good at exploration but poor at exploitation. Inspired by Particle swarm optimization, we propose an improved ACR algorithm called gbest-guided ACR (GACR) algorithm by incorporating the information of global best (gbest) solution into the solution search equation to improve the exploitation. The experimental results tested on a set of numerical benchmark functions show that GACR algorithm can outperform ACR algorithm in most of the experiments © 2011 Published by Elsevier Ltd.


Liu Q.,Donghua University | Zou R.,Donghua University | Bando Y.,Japan International Center for Materials Nanoarchitectonics | Golberg D.,Japan International Center for Materials Nanoarchitectonics | Hu J.,Donghua University
Progress in Materials Science | Year: 2015

Since the discovery of metals encapsulated into multi-walled carbon nanotubes (CNTs), such sheathed structures attracted extensive interest with respect to the development of various synthetic strategies for producing the unique structure of nanowires sheathed inside nanotubes. The nanowire materials varied from metals to alloys, from semiconductors to insulators, and even metal-semiconductor heterojunctions were tried. In recent years, the studies on these nanostructures have been mainly focused on in-situ manipulation, property analysis and applications. Exploration of on-demand nano-engineering of the regarded structures toward practical device design and fabrication was mainly guided by high-resolution transmission electron microscopy (TEM) technique combining new capabilities of implementation of atomic force (AFM) or scanning tunneling microscopy (STM) holders, and heating/cooling holders. Such novel in-situ TEM techniques have rapidly developed to a stage where they truly become a very powerful tool for the studies of core/shell nanowire heterostructures. In this review, we summarize the significant developments and achievements in regards of manipulation, property measurements and device applications of inorganic nanowires sheathed inside nanotubes according to different categories of the filling materials, i.e., metals, alloys, compounds and semiconductor-metal heterojunction nanowires. We also highlight the irreplaceable value of in-situ TEM technology in this field, compare different fillings for so-called nanothermometers, discuss mass transportation mechanism in nanotubes, and conclude with an outlook of future developments and challenging issues that are still in the premature stage. © 2014, Elsevier Ltd. All rights reserved.


Wang Z.,Donghua University | Wang Z.,Brunel University | Ho D.W.C.,City University of Hong Kong | Dong H.,Harbin Institute of Technology | And 2 more authors.
IEEE Transactions on Automatic Control | Year: 2010

This technical note addresses the robust H∞ finite-horizon output feedback control problem for a class of uncertain discrete stochastic nonlinear time-varying systems with both sensor and actuator saturations. In the system under investigation, all the system parameters are allowed to be time-varying, the parameter uncertainties are assumed to be of the polytopic type, and the stochastic nonlinearities are described by statistical means which can cover several classes of well-studied nonlinearities. The purpose of the problem addressed is to design an output feedback controller, over a given finite-horizon, such that the H∞ disturbance attenuation level is guaranteed for the nonlinear stochastic polytopic system in the presence of saturated sensor and actuator outputs. Sufficient conditions are first established for the robust H∞ performance through intensive stochastic analysis, and then a recursive linear matrix inequality (RLMI) approach is employed to design the desired output feedback controller achieving the prescribed H∞ disturbance rejection level. Simulation results demonstrate the effectiveness of the developed controller design scheme. © 2006 IEEE.


Peng G.,Harbin Institute of Technology | Chen G.,Donghua University | Wu C.,Harbin Institute of Technology | Xin H.,Harbin Institute of Technology | Jiang Y.,Harbin Institute of Technology
Expert Systems with Applications | Year: 2011

A fixture is a special tool used to accurately and stably locate the workpiece during machining process. Proper fixture design improves the quality and production of parts and also facilitates the interchangeability of parts that is prevalent in much of modern manufacturing. This study combines the rule-based reasoning (RBR) and case-based reasoning (CBR) method for machining fixture design in a VR based integrated system. In this paper, an approach combines the RBR and fuzzy comprehensive judgment method is proposed for reasoning suitable locating schemes and locating features. Based on the reasoning results, a CBR method for machining fixture design is then presented. This method could help designers, by referencing previous design cases, to make a conceptual fixturing solution quickly. Finally, the implementation of proposed system is outlined and cases study has been used to demonstrate the applicability of the proposed approach. © 2010 Elsevier Ltd. All rights reserved.


Li J.,Zhejiang University | Li J.,Donghua University | Li J.,CAS Institute of Automation | Lu G.,Zhejiang University
Computers in Industry | Year: 2011

Improving the reusability of design results is very important for garment design industry, since designing an elegant garment is usually labor-intensive and time-consuming. In this paper, we present a new approach for customizing 3D garment models. Our approach can transfer garment models initially dressed on a reference human model onto a target human model. To achieve this goal, firstly a spatial mapping between the two human models is established with the shape constraints of cross-sections. Secondly, the space around the clothed reference human model is tetrahedralized into five tetrahedral meshes each of which either can be worked dependently with its adjacent ones or can be worked independently. The clothed reference human model is parametrically encoded in the tetrahedral meshes. Thirdly, these tetrahedral meshes are deformed by fitting the reference human model onto the target human model by using constrained volumetric graph Laplacian deformation. The updated garment models are finally decoded from the deformed tetrahedral meshes. As a result, the updated garment models are fitted onto the target human model. Experiments show that our approach performs very well and has the potential to be used in the garment design industry. © 2011 Elsevier B.V. All rights reserved.


Wang Z.,Donghua University | Wang Z.,Brunel University | Ding D.,Donghua University | Dong H.,Northeast Petroleum University | And 2 more authors.
Systems and Control Letters | Year: 2013

This paper deals with the H∞ consensus control problem for a class of discrete time-varying multi-agent systems with both missing measurements and parameter uncertainties. A directed graph is used to represent the communication topology of the multi-agent network, and a binary switching sequence satisfying a conditional probability distribution is employed to describe the missing measurements. The purpose of the addressed problem is to design a time-varying controller such that, for all probabilistic missing observations and admissible parameter uncertainties, the H∞ consensus performance is guaranteed over a given finite horizon for the closed-loop networked multi-agent systems. According to the given topology, the measurement output available for the controller is not only from the individual agent but also from its neighboring agents. By using the completing squares method and stochastic analysis techniques, necessary and sufficient conditions are derived for the H∞ consensus to be ensured, and then the time-varying controller parameters are designed by solving coupled backward recursive Riccati difference equations (RDEs). A simulation example is utilized to illustrate the usefulness of the proposed control protocol. © 2013 Elsevier B.V. All rights reserved.


Feng J.,Harbin Institute of Technology | Wang Z.,Donghua University | Wang Z.,Brunel University | Zeng M.,Harbin Institute of Technology
Information Fusion | Year: 2013

In this paper, the problem of distributed weighted robust Kalman filter fusion is studied for a class of uncertain systems with autocorrelated and cross-correlated noises. The system under consideration is subject to stochastic uncertainties or multiplicative noises. The process noise is assumed to be one-step autocorrelated. For each subsystem, the measurement noise is one-step autocorrelated, and the process noise and the measurement noise are two-step cross-correlated. An optimal robust Kalman-type recursive filter is first designed for each subsystem. Then, based on the newly obtained optimal robust Kalman-type recursive filter, a distributed weighted robust Kalman filter fusion algorithm is derived for uncertain systems with multiple sensors. The distributed fusion algorithm involves a recursive computation of the filtering error cross-covariance matrix between any two subsystems. Compared with the centralized Kalman filter, the distributed weighted robust Kalman filter developed in this paper has stronger fault-tolerance ability. Simulation results are provided to demonstrate the effectiveness of the proposed approaches. © 2011 Elsevier B.V. All rights reserved.


Ju A.,Jiangnan University | Xu H.,Donghua University | Ge M.,Jiangnan University
Journal of Thermal Analysis and Calorimetry | Year: 2014

In order to replace terpolymer with bipolymer, a bifunctional comonomer β-methylhydrogen itaconate (MHI) containing carboxyl group and ester group was synthesized to prepare poly[acrylonitrile-co-(β-methylhydrogen itaconate)] [P(AN-co-MHI)] bipolymers used as carbon fiber precursor for improving the stabilization and spinnability at the same time. The P(AN-co-MHI) bipolymers with different monomer feed ratios were characterized by elemental analysis, Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and differential scanning calorimetry (DSC). The results show that both the polymerization conversion and molecular mass of P(AN-co-MHI) reduce with the increasing MHI amounts in the feed due to the larger molecular volume of MHI than acrylonitrile (AN). The monomer reactivity ratios were calculated by Fineman-Ross and Kelen-Tüdõs methods, the results show good agreement and MHI possesses higher reactivity than AN. Two parameters Es = A1, 629 cm-1 / A2, 244 cm 1 and SI = (I0 - I S) / I0 were defined to evaluate the extent of stabilization, and the activation energy (E a) of the cyclization was calculated by Kissinger method and Ozawa method. The FTIR, XRD, and DSC results show that P(AN-co-MHI) bipolymers exhibit significantly improved stabilization characteristics than PAN homopolymer, such as larger extent of stabilization, lower initiation temperature, and smaller E a of cyclization, which is attributed to the ionic initiation by MHI comonomer and it is beneficial to preparing high-performance carbon fiber. © 2013 Akadémiai Kiadó, Budapest, Hungary.


Ding D.,Donghua University | Wang Z.,Donghua University | Wang Z.,Brunel University | Dong H.,Harbin Institute of Technology | Shu H.,Donghua University
Automatica | Year: 2012

This paper deals with the distributed H ∞ state estimation problem for a class of discrete time-varying nonlinear systems with both stochastic parameters and stochastic nonlinearities. The system measurements are collected through sensor networks with sensors distributed according to a given topology. The purpose of the addressed problem is to design a set of time-varying estimators such that the average estimation performance of the networked sensors is guaranteed over a given finite-horizon. Through available output measurements from not only the individual sensor but also its neighboring sensors, a necessary and sufficient condition is established to achieve the H ∞ performance constraint, and then the estimator design scheme is proposed via a certain H 2-type criterion. The desired estimator parameters can be obtained by solving coupled backward recursive Riccati difference equations (RDEs). A numerical simulation example is provided to demonstrate the effectiveness and applicability of the proposed estimator design approach. © 2012 Elsevier Ltd. All rights reserved.


Feng J.,Harbin Institute of Technology | Wang Z.,Donghua University | Wang Z.,Brunel University | Zeng M.,Harbin Institute of Technology
Aerospace Science and Technology | Year: 2011

In this paper, the optimal robust non-fragile Kalman-type recursive filtering problem is studied for a class of uncertain systems with finite-step autocorrelated measurement noises and multiple packet dropouts. The system state, measurement output and filter parameters are all subject to stochastic uncertainties or multiplicative noises, where the measurement noises are finite-step autocorrelated. When there exist multiple packet dropouts in the system output, the original system is converted into an auxiliary stochastic uncertain system by the augmentation of system states and measurements. The process noises and measurement noises of the auxiliary system are shown to be finite-step autocorrelated and cross-correlated. Then, a robust non-fragile Kalman-type recursive filter is designed that is optimal in the minimum-variance sense. The proposed filter is not only robust against the uncertainties in the system model and measurement model, but also non-fragile against the implementation error with the filter parameters. Simulation results are employed to demonstrate the effectiveness of the proposed method. © 2010 Elsevier Masson SAS. All rights reserved.


Zhou X.,Donghua University | Qiao J.,Donghua University | Qiao J.,Henan Normal University | Yang L.,Henan Normal University | And 2 more authors.
Advanced Energy Materials | Year: 2014

A comprehensive overview and description of graphene-based nanomaterials explored in recent years for catalyst supports and metal-free catalysts for polymer electrolyte membrane (PEM) fuel cell oxygen reduction reactions (ORR) is presented. The catalyst material structures/morphologies, material selection, and design for synthesis, catalytic performance, catalytic mechanisms, and theoretical approaches for catalyst down-selection and catalyzed ORR mechanisms are emphasized with respect to the performance of ORR catalysts in terms of both activity and stability. When graphene-based materials, including graphene and doped graphene, are used as the supporting materials for both Pt/Pt alloy catalysts and non-precious metal catalyst, the resulting ORR catalysts can give superior catalyst activity and stability compared to those of conventional carbon-supported catalysts; when they are used as metal-free ORR catalysts, significant catalytic activity and stability are observed. The nitrogen-doped graphene materials even show superior performance compared to supported metal catalysts. Challenges including the lack of material mass production, unoptimized catalyst structure/morphology, insufficient fundamental understanding, and testing tools/protocols for performance optimization and validation are identified, and approaches to address these challenges are suggested. A comprehensive overview and description of graphene-based nanomaterials for catalyst supports and metal-free catalysts for polymer electrolyte membrane (PEM) fuel cell oxygen reduction reactions (ORR) is presented. The catalyst material selection, design, synthesis, and characterization, as well as a theoretical understanding of the catalysis process and mechanisms are discussed. The challenges and their corresponding approaches, in addition to directions for future perspectives and research are suggested. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Wang Y.-J.,Donghua University | Wang Y.-J.,National Research Council Canada | Qiao J.,Donghua University | Baker R.,National Research Council Canada | And 2 more authors.
Chemical Society Reviews | Year: 2013

In this review, we examine the most recent progress and research trends in the area of alkaline polymer electrolyte membrane (PEM) development in terms of material selection, synthesis, characterization, and theoretical approach, as well as their fabrication into alkaline PEM-based membrane electrode assemblies (MEAs) and the corresponding performance/durability in alkaline polymer electrolyte membrane fuel cells (PEMFCs). Respective advantages and challenges are also reviewed. To overcome challenges hindering alkaline PEM technology advancement and commercialization, several research directions are then proposed. © 2013 The Royal Society of Chemistry.


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.


Qiao J.,Donghua University | Jiang P.,Donghua University | Liu J.,Donghua University | Zhang J.,Donghua University | Zhang J.,National Research Council Canada
Electrochemistry Communications | Year: 2014

An effective fibrous Cu electrode surface, created using a procedure combining high-temperature annealing and electroreduction, is explored for CO2 reduction to produce useful fuels. The nanostructure of this Cu electrode surface contains a layer of nanofibers or nanofibers surrounded by kernels with 30-100 nm diameters. With a specific surface area as high as 458 cm2 per geometric electrode surface area, this nanostructured electrode is found to have a high activity toward CO2 reduction, indicated by its more positive reduction potentials and higher catalytic current density than a smooth Cu electrode. The Faradaic efficiency for HCOO - production is 43%, and the electrode surface remains stable during 19 h of electrolysis - better results than with smooth Cu under identical conditions. © 2013 Elsevier B.V.


Xu P.,Donghua University | Xu P.,University of Delaware | Kang J.,Sungkyunkwan University | Choi J.-B.,Sungkyunkwan University | And 6 more authors.
ACS Nano | Year: 2014

Due to their exceptional flexibility and transparency, CVD graphene films have been regarded as an ideal replacement of indium tin oxide for transparent electrodes, especially in applications where electronic devices may be subjected to large tensile strain. However, the search for a desirable combination of stretchability and electrochemical performance of such devices remains a huge challenge. Here, we demonstrate the implementation of a laminated ultrathin CVD graphene film as a stretchable and transparent electrode for supercapacitors. Transferred and buckled on PDMS substrates by a prestraininig-then-buckling strategy, the four-layer graphene film maintained its outstanding quality, as evidenced by Raman spectra. Optical transmittance of up to 72.9% at a wavelength of 550 nm and stretchability of 40% were achieved. As the tensile strain increased up to 40%, the specific capacitance showed no degradation and even increased slightly. Furthermore, the supercapacitor demonstrated excellent frequency capability with small time constants under stretching. © 2014 American Chemical Society.


Liu H.,Donghua University | Lai X.,Zhejiang Chinese Medical University | Wu W.,Zhejiang University
Robotics and Computer-Integrated Manufacturing | Year: 2013

In this paper a high smooth trajectory planning method is presented to improve the practical performance of tracking control for robot manipulators. The strategy is designed as a combination of the planning with multi-degree splines in Cartesian space and multi-degree B-splines in joint space. Following implementation, under the premise of precisely passing the via-points required, the cubic spline is used in Cartesian space planning to make either the velocities or the accelerations at the initial and ending moments controllable for the end effector. While the septuple B-spline is applied in joint space planning to make the velocities, accelerations and jerks bounded and continuous, with the initial and ending values of them configurable. In the meantime, minimum-time optimization problem is also discussed. Experimental results show that, the proposed approach is an effective solution to trajectory planning, with ensuring a both smooth and efficiency tracking performance with fluent movement for the robot manipulators. © 2012 Elsevier Ltd. All rights reserved.


Hu L.,West Anhui University | Yan Z.,West Anhui University | Yan Z.,Donghua University | Xu H.,Donghua University
RSC Advances | Year: 2013

Due to the specially rigid, planar and zwitterionic structures, squaraine dyes have strong absorption (ε ≥ 105 L mol-1 cm-1) in the visible to near-infrared region. Therefore, squaraine dyes have been extensively investigated from both fundamental and technological viewpoints. To present the readers a better understanding of the important dyes, in this article, we will highlight the recent synthetic developments of squaraine derivatives as a class of functional near infrared absorbing optic materials and their application in the areas of anti-aggregation, sensor, solar cell, nonlinear optics and self-assembly functional materials based on our own work during the recent years. © 2013 The Royal Society of Chemistry.


Zhou Z.,Shanghai Normal University | Kong B.,Shanghai Normal University | Yu C.,Shanghai Normal University | Shi X.,Donghua University | And 6 more authors.
Scientific Reports | Year: 2014

We report here a facile thermal decomposition approach to creating tungsten oxide nanorods (WO2.9 NRs) with a length of 13.1 ± 3.6 nm and a diameter of 4.4 ± 1.5 nm for tumor theranostic applications. The formed WO2.9 NRs were modified with methoxypoly(ethylene glycol) (PEG) carboxyl acid via ligand exchange to have good water dispersability and biocompatibility. With the high photothermal conversion efficiency irradiated by a 980 nm laser and the better X-ray attenuation property than clinically used computed tomography (CT) contrast agent Iohexol, the formed PEGylated WO 2.9 NRs are able to inhibit the growth of the model cancer cells in vitro and the corresponding tumor model in vivo, and enable effective CT imaging of the tumor model in vivo. Our "killing two birds with one stone" strategy could be extended for fabricating other nanoplatforms for efficient tumor theranostic applications.


Yang H.,Shanghai Normal University | Zhuang Y.,Shanghai Normal University | Hu H.,Shanghai Normal University | Du X.,Shanghai Normal University | And 5 more authors.
Advanced Functional Materials | Year: 2010

Monodisperse silica-coated manganese oxide nanoparticles (NPs) with a diameter of ∼35 nm are synthesized and are aminated through silanization. The amine-functionalized core-shell NPs enable the covalent conjugation of a fluorescent dye, Rhodamine B isothiocyanate (RBITC), and folate (FA) onto their surface. The formed Mn3O4@SiO2(RBITC)-FA core-shell nanocomposites are water-dispersible, stable, and biocompatible when the Mn concentration is below 50 μg mL-1 as confirmed by a cytotoxicity assay. Relaxivity measurements show that the core-shell NPs have a T1 relaxivity (r1) of 0.50 mm-1s-1 on the 0.5 T scanner and 0.47 mm-1S-1 on the 3.0 T scanner, suggesting the possibility of using the particles as a T1 contrast agent Combined flow cytometry, confocal microscopy, and magnetic resonance imaging studies show that the Mn3O4@SiO 2(RBITC)-FA nanocomposites can specifically target cancer cells overexpressing FA receptors (FARs). Findings from this study suggest that the silica-coated Mn3O4 core-shell NPs could be used as a platform for bimodal imaging (both magnetic resonance and fluorescence) in various biological systems. © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Xue J.,Shanghai Key Laboratory of Tissue Engineering | Xue J.,Wenzhou Medical College | Feng B.,Donghua University | Zheng R.,Shanghai Key Laboratory of Tissue Engineering | And 6 more authors.
Biomaterials | Year: 2013

Tissue engineering approach continuously requires for emerging strategies to improve the efficacy in repairing and regeneration of tissue defects. Previously, we developed a sandwich model strategy for cartilage engineering, using the combination of acellular cartilage sheets (ACSs) and chondrocytes. However, the process for the preparation of ACSs is complicated, and it is also difficult to obtain large ACSs. The aim of this study was to engineer cartilage with precise three-dimensional (3-D) structures by applying electrospun fibrous membranes of gelatin/polycaprolactone (GT/PCL). We first prepared the electrospun GT/PCL membranes into rounded shape, and then seeded chondrocytes in the sandwich model. After in vitro and in vivo cultivation, the newly formed cartilage-like tissues were harvested. Macroscopic observations and histological analysis confirmed that the engineering of cartilage using the electrospun GT/PCL membranes was feasible. An ear-shaped cartilage was then constructed in the sandwich model, with the help of an ear-shaped titanium alloy mold. After 2 weeks of culture in vitro and 6 weeks of subcutaneous incubation in vivo, the ear-shaped cartilage largely maintained their original shape, with a shape similarity up to 91.41% of the titanium mold. In addition, the engineered cartilage showed good elasticity and impressive mechanical strength. These results demonstrated that the engineering of 3-D cartilage in a sandwich model using electrospun fibrous membranes was a facile and effective approach, which has the potential to be applied for the engineering of other tissues with complicated 3-D structures. © 2012 Elsevier Ltd.


Qiao J.,Donghua University | Zhang J.,Donghua University | Zhang J.,National Research Council Canada
Journal of Power Sources | Year: 2013

Novel and highly durable alkaline anion-exchange membranes, PVA/PDDA-OH-, are synthesized using a combined thermal and chemical cross-linking method. In the synthesis, poly(vinyl alcohol) (PVA) is used as polymer matrix and poly(diallyldimethylammonium chloride) (PDDA) as anion charge carriers. The resulting membrane exhibits a high hydroxide conductivity of 0.025 S cm-1 at a polymer composition PVA/PDDA being 1:0.5 by mass. A promising H2/O2 fuel cell peak power density of 32.7 mW cm-2 is reached for MEA fabricated with this PVA/PDDA-OH- at 25 °C. The membrane also shows a strong alkaline stability in 8 M KOH at 80 °C for 360 h. This is considered a new record for the fully cation-free hydrocarbon membranes for the use in alkaline fuel cell, seeing that PVA/PDDA-OH- is made simply of aliphatic skeletons. © 2013 Elsevier B.V. All rights reserved.


Zhou X.,Donghua University | Bai Z.,Henan Normal University | Wu M.,Donghua University | Qiao J.,Donghua University | And 2 more authors.
Journal of Materials Chemistry A | Year: 2015

Nitrogen-doped graphene materials have been demonstrated as promising alternative catalysts for the oxygen reduction reaction (ORR) in fuel cells and metal-air batteries due to their relatively high activity and good stability in alkaline solutions. However, they suffer from low catalytic activity in acid medium. Herein, we have developed an efficient ORR catalyst based on nitrogen doped porous graphene foams (PNGFs) using a hard templating approach. The obtained catalyst exhibits both remarkable ORR activity and long term stability in both alkaline and acidic solutions, and its ORR activity is even better than that of the Pt-based catalyst in alkaline medium. Our results demonstrate a new strategy to rationally design highly efficient graphene-based non-precious catalysts for electrochemical energy devices. © The Royal Society of Chemistry 2015.


Qiao J.,Donghua University | Xu L.,Donghua University | Ding L.,Donghua University | Zhang L.,National Research Council Canada | And 3 more authors.
Applied Catalysis B: Environmental | Year: 2012

The development of non-noble metal catalysts is of great interest due to their significant potential application in both fuel cell systems and metal-air batteries, particularly when considering long term commercial deployment. In this regard, novel Co-N-S/C non-noble metal catalysts supported on carbon, are synthesized in this study using a solvent-milling method followed by heat-treatment at elevated temperatures. Pyridine is used as the nitrogen-rich ligand for Co-N x precursor complex formation. The morphology and composition of the catalyst are characterized by X-ray diffraction (XRD), energy-dispersive X-ray (EDX) spectroscopy, transmission electron microscopy (TEM) as well as X-ray photoelectron spectroscopy (XPS). Several catalysts containing different amounts of Co are also synthesized. The optimal Co content is found to be in the range of 10-15wt% nominal, in terms of catalytic oxygen reduction reaction (ORR) activity. This catalyst shows high electroactivity for the ORR with a high stability in alkaline media. Using rotating disk electrode measurements, and Koutechy-Levich analysis, the overall electron transfer number in the catalyzed ORR is found to be 3.8-4.0, suggesting the catalyzed ORR is a four-electron transfer process from O 2 to H 2O. © 2012 Elsevier B.V..


Ding L.,Donghua University | Qiao J.,Donghua University | Dai X.,Donghua University | Zhang J.,Donghua University | And 2 more authors.
International Journal of Hydrogen Energy | Year: 2012

The active, carbon-supported copper phthalocyanine (CuPc/C) nano-catalyst, as a novel cathode catalyst for oxygen reduction reaction, is synthesized via a combined solvent-impregnation along with the high temperature treatment. The catalytic activities of both pyrolyzed and unpyrolyzed catalysts are screened by linear sweep voltammetry (LSV) employing a rotating disk electrode (RDE) technique to quantitatively obtain the oxygen reduction reaction (ORR) kinetic constants and the reaction mechanisms. The results show that heat-treatment can significantly improve the ORR activity of the catalyst, and the optimal heat-treated temperature is around 800 °C, under which, an onset potential of 0.10 V and a half-wave potential of -0.05 V are achieved in alkaline electrolyte. Besides the ORR kinetic rate is increased, the ORR electron transfer number is also increased from 2.5 to 3.6 with increasing heat-treatment temperature from 600 to 800 °C. Also, the effect of catalyst loading in the catalyst layer on the corresponding ORR activity is also studied, and finds that increasing the catalyst loading, the catalyzed ORR kinetic current density can be significantly increased. For a fully understanding of this heat-treatment temperature effect, XRD, TEM, SEM-EDX, TG and XPS are used to identify the catalyst structure and composition. TG results demonstrated that the presence of Cu prevents phthalocyanine from thermal decomposition, thus contribute to higher nitrogen content which can form more Cu-Nx activity sites for the ORR. XPS analysis indicates that both pyridinic-N and graphitic-N may be responsible for the enhanced ORR activity. © 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.


Xu Y.,Wuhan University | Xu Y.,Yunyang Teachers College | Xu Y.,Donghua University | Zhou W.,Donghua University | Fang J.,Donghua University
Nonlinear Dynamics | Year: 2012

In practical situations, there exists much uncertain information in complex networks, such as the topological structures and the time delays. So the identification of the topology is an important issue in the research of the complex networks with time delays. In this paper, we consider the problem of identification of the topology of modified complex networks with non-delayed and delayed coupling, and achieve the synchronization of the response networks with the drive networks. Finally, some simulation results are given to show the effectiveness of the method proposed in this paper. © 2011 Springer Science+Business Media B.V.


Fan J.,Tianjin Polytechnic University | Yu W.D.,Donghua University
Advanced Materials Research | Year: 2011

Wool fiber shows a natural crimp morphology, which endows textiles made of wool fiber with good elasticity and warmth-retaining performance. The natural crimp of wool fiber is due to the difference of the hierarchic structure of ortho-cortex and para-cortex of wool fiber. The present study investigated the fractal structure of ortho-cortex and para-cortex in detail to provide a new interpretation for the reason why the wool fiber has a natural crimp morphology and good performance in textiles. © (2011) Trans Tech Publications.


Lu W.,Donghua University | Zhu C.,Xi'an Jiaotong University
IEEE Transactions on Industrial Electronics | Year: 2010

In this paper, we present the bulk acoustic wave (BAW), the soundelectricity reclamation (SER), and the insertion loss as the three key problems of a wavelet transform processor using surface acoustic wave devices. The solutions to these problems are achieved in this study. The more the number of electrode pairs for the interdigital transducer (IDT) is, the weaker the excited BAW is, so the BAW can be eliminated when the number of electrode pairs for IDT is large enough. The substrate material of a small electromechanical coupling coefficient (ECC) k 2 and the low-impedance load of IDT can eliminate SER. When the output ends of the wavelet transform processors are respectively connected to the amplifiers, their insertion losses can be compensated. X-112°Y LiTaO 3 (small ECC k 2) is used as a substrate material to fabricate the wavelet transform processor. © 2010 IEEE.


Duan Q.,Donghua University | Wang H.,Donghua University | Benziger J.,Princeton University
Journal of Membrane Science | Year: 2012

The flux of liquid water through Nafion membranes of different thickness and equivalent weight was measured as a function of hydrostatic pressure and temperature. Hydraulic water transport across Nafion membranes increases with temperature and equivalent weight of the Nafion. Hydraulic permeability increases with temperature due to both decreased water viscosity and increased hydrophilic volume fraction. Convective flow from the applied hydrostatic water pressure is an order of magnitude greater than the estimated diffusive water flux associated with the water activity gradient. Water sorption and hydraulic permeability data predict a hydrophilic pore network with hydrophilic domains 2.5. nm in diameter spaced 5.5. nm apart. The pore network structure from water sorption and hydraulic permeability are consistent with the spacing between hydrophilic domains observed with small angle X-ray scattering experiments. © 2011 Elsevier B.V.


Zongyao H.,Henan University of Urban Construction | Zhou L.,Donghua University
International Journal of Advancements in Computing Technology | Year: 2011

A new real-coded quantum evolutionary algorithm is proposed in this paper. The new algorithm consists of trigonometric quantum individuals (TQIs) which are different from traditional quantum individuals design. The new TQIs specify two potential parallel structures; they can react upon each other in order to improve the efficiency of the new algorithm. In the course of evolution, the population executes high frequency mutation operation to keep its diversity, and then use the prior information which include optimal solution and gradient information of objective function to implement the update operation with acceleration mechanism. Numerical results indicate that this new algorithm has the characteristics of fast convergence rate, and good global search capability.


Gauthier E.,Princeton University | Duan Q.,Donghua University | Hellstern T.,Princeton University | Benziger J.,Princeton University
Fuel Cells | Year: 2012

Liquid water produced in polymer electrolyte membrane fuel cells is transported from the cathode catalyst/membrane interface through the gas diffusion layer (GDL) to the gas flow channel. Liquid water travels both laterally (in the plane of GDL) and transversely through the largest pores of the porous GDL structure. Narrow apertures in the largest pores are the primary resistance to liquid water penetration. Carbon paper has limiting apertures ~20 μm in diameter and ~1 lm in length whereas carbon cloth has apertures ~100 lm in diameter and ~200 lm in length. After sufficient hydrostatic pressure is applied, water penetrates the limiting aperture and flows through the pore. The pressure required for water to flow through the pores is less than the pressure to penetrate the limiting aperture of the pores. Water moved laterally and directed through a small number of transverse pores. There is less resistance to lateral liquid water flow at the interface between the GDL and a solid surface than through the GDL. The results from these experiments suggest that water flow through the GDL is dominated by a small number of pores and most pores remain free of liquid water. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA,Weinheim.


Shi P.,Donghua University | Shi P.,Henan University of Urban Construction | Su R.,Donghua University | Wan F.,Donghua University | And 4 more authors.
Applied Catalysis B: Environmental | Year: 2012

Graphene oxide and cobalt oxide nanocomposites (Co 3O 4/GO) are fabricated in situ as heterogeneous catalysts by the decomposition of cobalt nitrate through heat and crystal growth of Co 3O 4 on the surface of GO sheets in 1-hexanol solvent. The Co 3O 4/GO catalyst is characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), energy dispersive X-ray spectroscopy (EDS), scanning electron microscopy (SEM), and high-resolution transmission electron microscopy (HRTEM). Results show that the Co 3O 4/GO catalysts are large GO sheets decorated homogenously with well-dispersed Co 3O 4 nanoparticles. Although Co 3O 4 or GO alone exhibit little catalytic activity, their hybrid (Co 3O 4/GO) exhibits an unexpectedly high catalytic activity in the degradation of Orange II in water by advanced oxidation technology based on sulfate radicals, and 100% decomposition can be achieved in 6min. These phenomena suggest a synergistic catalytic activity of Co 3O 4 and GO in the hybrid. © 2012 Elsevier B.V.


Zheng F.,Xi'an Jiaotong University | Zheng F.,Donghua University | Cheng Y.,Xi'an Jiaotong University | Liu M.,Tongji University | Xu Y.,Xi'an Jiaotong University
Computers and Operations Research | Year: 2013

We study an online weighted interval scheduling problem on a single machine, where all intervals have unit length and the objective is to maximize the total weight of all completed intervals. We investigate how the function of finite lookahead improves the competitivities of deterministic online heuristics, under both preemptive and non-preemptive models. The lookahead model studied in this paper is that an online heuristic is said to have a lookahead ability of LD if at any time point it is able to foresee all the intervals to be released within the next LD units of time. We investigate both competitive online heuristics and lower bounds on the competitive ratio, with lookahead 0≤LD≤1 under the preemptive model, and lookahead 0≤LD≤2 under the non-preemptive model. A method to transform a preemptive lookahead online algorithm to a non-preemptive online algorithm with enhanced lookahead ability is also given. Computational tests are performed to compare the practical competitivities of the online heuristics with different lookahead abilities. © 2012 Elsevier Ltd. All rights reserved.


Li F.,Donghua University | Meng J.,Tianjin Polytechnic University | Ye J.,Shanghai Academy of Environmental science | Yang B.,Donghua University | And 3 more authors.
Desalination | Year: 2014

Polydopamine (PD) coating and PD-graft-poly(ethylene glycol) (PD-g-PEG) surface modification can be used to improve the anti-fouling properties of membrane surface. This work studies the features of polyethersulfone (PES) membranes with different molecular weight cut-off (MWCO) modified by PD coating and PD-g-PEG modification on their morphology, stability, and adsorbability. The stability of modified membranes was evaluated by immersion tests. Bovine serum albumin (BSA) was used as a model foulant to investigate the anti-biofouling performance of modified membranes. The results of stability tests showed that both modified membranes had a fine mechanical stability, and the PD-g-PEG modified membrane had a better chemical stability. The images of FESEM and AFM indicate the modifications of PD coating and PD-g-PEG changes the morphology of the PES ultrafiltration (UF) membrane apparently. The modified membranes had less flux reduction in filtration and lower adsorptive amount of BSA in isothermal adsorption tests. The PD-g-PEG modification improves the stability of the PES membrane and the adsorbability for BSA more significantly. © 2014 Elsevier B.V.


Fan J.,Tianjin Polytechnic University | Yu W.,Donghua University
Fibers and Polymers | Year: 2012

A descaling and oxidation pretreatment was employed to maximize the yield of cortical cells in the disintegration process of wool fiber. The results indicated that the productivity of intact cortical cells was greatly increased by moderate oxidation pretreatment in 1. 6 % per-acetic acid within 2 h, but the yield would be decreased by further oxidation pretreatment. In order to give a reasonable explanation for this fact, the effect of the increasing time of oxidation pretreatment on the yield of intact cortical cells was investigated by means of spectral analysis using FT-IR and XRD. The intensity of the peak at 1040 and 1173 cm -1 in FT-Infrared spectrum gradually increased with increasing oxidation pretreatment time, suggesting that more and more SS bonds were cleaved to form cysteic acid. X-ray Diffraction investigation showed that the crystallinity of wool fiber obviously decreased when the time of oxidation pretreatment exceeded 2 h. The combined results of FT-IR and XRD revealed that SS bonds in the amorphous region of wool fiber were first cleaved in the fiber components. The selective cleavage of SS bonds in the amorphous region by the appropriate oxidation pretreatment can effectively decrease the bonding force between the components of wool fiber and enhance the yield of intact cortical cells. © 2012 The Korean Fiber Society and Springer Science+Business Media Dordrecht.


Hu L.,Donghua University | Mao X.,University of Strathclyde | Mao X.,Fuzhou University | Zhang L.,Beijing University of Technology
IEEE Transactions on Automatic Control | Year: 2013

One of the important issues in the study of hybrid stochastic differential delay equations (SDDEs) is the automatic control, with consequent emphasis being placed on the asymptotic analysis of stability and boundedness. In the study of asymptotic properties, the robust stability has received a great deal of attention. The theory of robust stability shows how much perturbation a given stable hybrid SDDE can tolerate so that its perturbed system remains stable. Almost all results so far on the robust stability require that the underlying SDDEs be either linear or nonlinear with linear growth condition. However, little is known on the robust stability of nonlinear hybrid SDDEs without the linear growth condition, which is one of the key topics in this paper. The other key topic is the robust boundedness. The aim here is to answer the question: how much perturbation can a given asymptotically bounded hybrid SDDE tolerate so that its perturbed system remains asymptotically bounded? © 1963-2012 IEEE.


Shen B.,Donghua University | Wang Z.,Donghua University | Wang Z.,Brunel University | Hung Y.S.,University of Hong Kong | Chesi G.,University of Hong Kong
IEEE Transactions on Industrial Electronics | Year: 2011

In this paper, the distributed H∞ filtering problem is addressed for a class of polynomial nonlinear stochastic systems in sensor networks. For a Lyapunov function candidate whose entries are polynomials, we calculate its first- and second-order derivatives in order to facilitate the use of It's differential rule. Then, a sufficient condition for the existence of a feasible solution to the addressed distributed H∞ filtering problem is derived in terms of parameter-dependent linear matrix inequalities (PDLMIs). For computational convenience, these PDLMIs are further converted into a set of sums of squares that can be solved effectively by using the semidefinite programming technique. Finally, a numerical simulation example is provided to demonstrate the effectiveness and applicability of the proposed design approach. © 2010 IEEE.


Wang H.,Donghua University | Zhang L.,Donghua University | Chen Z.,Donghua University | Hu J.,Donghua University | And 4 more authors.
Chemical Society Reviews | Year: 2014

Semiconductor-mediated photocatalysis has received tremendous attention as it holds great promise to address the worldwide energy and environmental issues. To overcome the serious drawbacks of fast charge recombination and the limited visible-light absorption of semiconductor photocatalysts, many strategies have been developed in the past few decades and the most widely used one is to develop photocatalytic heterojunctions. This review attempts to summarize the recent progress in the rational design and fabrication of heterojunction photocatalysts, such as the semiconductor-semiconductor heterojunction, the semiconductor-metal heterojunction, the semiconductor-carbon heterojunction and the multicomponent heterojunction. The photocatalytic properties of the four junction systems are also discussed in relation to the environmental and energy applications, such as degradation of pollutants, hydrogen generation and photocatalytic disinfection. This tutorial review ends with a summary and some perspectives on the challenges and new directions in this exciting and still emerging area of research. This journal is © the Partner Organisations 2014.


Potts J.R.,University of Texas at Austin | Murali S.,University of Texas at Austin | Zhu Y.,University of Texas at Austin | Zhao X.,Donghua University | And 2 more authors.
Macromolecules | Year: 2011

We present the first report of polymer composites using microwave-exfoliated graphite oxide (MEGO) as filler, a high surface area carbon material that resembles graphene on a local scale. MEGO has a "wormlike" layered structure which can be sheared apart during melt mixing with a polymer host. In this study, we produced MEGO/polycarbonate (PC) composites at various loadings and evaluated their morphology and properties. Transmission electron microscopy and X-ray scattering studies suggested an exfoliated morphology, with wrinkled platelets of approximately 4-5 nm thickness evenly dispersed throughout the PC matrix. Frequency scans of composite melts using shear rheology showed an onset of frequency-independent terminal behavior around 2.1 wt %, suggesting an effective aspect ratio of nearly 50 for the dispersed platelets, in agreement with TEM analysis. The composites showed significant increases in electrical conductivity, with an onset of electrical percolation around 1.3 wt %, but only exhibited modest improvements in thermal conductivity. Long-term thermal annealing was performed to promote disorientation of the dispersed platelets, which further improved the electrical conductivity but had little effect on the thermal conductivity. Dynamic mechanical analysis showed reinforcement by MEGO; however, very little change in the glass transition temperature and in the thermal stability was observed in the composites versus neat PC. © 2011 American Chemical Society.


Tang X.,Donghua University | Si Y.,Donghua University | Ge J.,Donghua University | Ding B.,Donghua University | And 4 more authors.
Nanoscale | Year: 2013

Creating an efficient, cost-effective method that can provide simple, practical and high-throughput separation of oil-water mixtures has proved extremely challenging. This work responds to these challenges by designing, fabricating and evaluating a novel fluorinated polybenzoxazine (F-PBZ) modified nanofibrous membrane optimized to achieve gravity driven oil-water separation. The membrane design is then realized by a facile combination of electrospun poly(m-phenylene isophthalamide) (PMIA) nanofibers and an in situ polymerized F-PBZ functional layer incorporating SiO2 nanoparticles (SiO 2 NPs). By employing the F-PBZ/SiO2 NP modification, the pristine hydrophilic PMIA nanofibrous membranes are endowed with promising superhydrophobicity with a water contact angle of 161° and superoleophilicity with an oil contact angle of 0°. This new membrane shows high thermal stability (350 °C) and good repellency to hot water (80 °C), and achieves an excellent mechanical strength of 40.8 MPa. Furthermore, the as-prepared membranes exhibited fast and efficient separation of oil-water mixtures by a solely gravity driven process, which makes them good candidates for industrial oil-polluted water treatments and oil spill cleanup, and also provided new insights into the design and development of functional nanofibrous membranes through F-PBZ modification. © 2013 The Royal Society of Chemistry.


Zhang L.L.,University of Texas at Austin | Zhao X.,University of Texas at Austin | Zhao X.,Donghua University | Stoller M.D.,University of Texas at Austin | And 8 more authors.
Nano Letters | Year: 2012

We present a novel method to prepare highly conductive, free-standing, and flexible porous carbon thin films by chemical activation of reduced graphene oxide paper. These flexible carbon thin films possess a very high specific surface area of 2400 m 2 g -1 with a high in-plane electrical conductivity of 5880 S m -1. This is the highest specific surface area for a free-standing carbon film reported to date. A two-electrode supercapacitor using these carbon films as electrodes demonstrated an excellent high-frequency response, an extremely low equivalent series resistance on the order of 0.1 ohm, and a high-power delivery of about 500 kW kg -1. While higher frequency and power values for graphene materials have been reported, these are the highest values achieved while simultaneously maintaining excellent specific capacitances and energy densities of 120 F g -1 and 26 W h kg -1, respectively. In addition, these free-standing thin films provide a route to simplify the electrode-manufacturing process by eliminating conducting additives and binders. The synthetic process is also compatible with existing industrial level KOH activation processes and roll-to-roll thin-film fabrication technologies. © 2012 American Chemical Society.


Shen B.,Donghua University | Wang Z.,Donghua University | Wang Z.,Brunel University | Hung Y.S.,University of Hong Kong
Automatica | Year: 2010

This paper is concerned with a new distributed H∞-consensus filtering problem over a finite-horizon for sensor networks with multiple missing measurements. The so-called H∞-consensus performance requirement is defined to quantify bounded consensus regarding the filtering errors (agreements) over a finite-horizon. A set of random variables are utilized to model the probabilistic information missing phenomena occurring in the channels from the system to the sensors. A sufficient condition is first established in terms of a set of difference linear matrix inequalities (DLMIs) under which the expected H∞-consensus performance constraint is guaranteed. Given the measurements and estimates of the system state and its neighbors, the filter parameters are then explicitly parameterized by means of the solutions to a certain set of DLMIs that can be computed recursively. Subsequently, two kinds of robust distributed H∞-consensus filters are designed for the system with norm-bounded uncertainties and polytopic uncertainties. Finally, two numerical simulation examples are used to demonstrate the effectiveness of the proposed distributed filters design scheme. © 2010 Elsevier Ltd. All rights reserved.


Li J.,Donghua University | Li J.,Key Laboratory of Clothing Design and Technology | Lu Y.,Donghua University | Li X.,Donghua University
Textile Research Journal | Year: 2012

Relative humidity (RH) and air gap size are two characteristic indices of clothing microclimate. The current thermal protective performance (TPP) tests cannot evaluate protective performance of fabrics under a microclimate with high temperature and humidity. In this study, a newly modified TPP test apparatus was applied to investigate the effect of RH in a microclimate on heat transfer of fabrics exposed to flash fires. Air gap heights from 0 to 24 mm with increments of 3 mm were employed. Three microclimates with different RH were preconditioned respectively. The results indicate that the RH in a microclimate significantly improves thermal protection of fabric with various air gaps. Under 35% RH, the TPP obviously increases with the air gap up to 15 mm and then the increment becomes a little lower; under humidified conditions (65% or 95% RH), it becomes higher substantially with air gap height increasing until 12 mm, subsequently it decreases or increases alternatively if the size keeps increasing. The positive effect of air gap with small size on TPP of fabrics is enhanced due to the increase of the vapor in the air; however, the positive effect of air gap with large size is interfered by the RH. It is indicated that around 12-15 mm was a critical air gap size under 35% RH, while about 12 mm was a key air gap size for a damp microclimate with 65% or 95% RH. © The Author(s) 2012 Reprints and permissions: sagepub.co.uk/journalsPermissions.nav.


Zhao X.,University of Texas at Austin | Zhao X.,Donghua University | Zhang L.,University of Texas at Austin | Murali S.,University of Texas at Austin | And 4 more authors.
ACS Nano | Year: 2012

Figure Persented: Manganese dioxide (MnO 2) particles 2-3 nm in size were deposited onto a porous "activated microwave expanded graphite oxide" (aMEGO) carbon scaffold via a self-controlled redox process. Symmetric electrochemical capacitors were fabricated that yielded a specific capacitance of 256 F/g (volumetric: 640 F/cm 3) and a capacitance retention of 87.7% after 1000 cycles in 1 M H 2SO 4; when normalized to MnO 2, the specific capacitance was 850 F/g. Asymmetric electrochemical capacitors were also fabricated with aMEGO/MnO 2 as the positive electrode and aMEGO as the negative electrode and had a power density of 32.3 kW/kg (for an energy density of 20.8 Wh/kg), an energy density of 24.3 Wh/kg (for a power density of 24.5 kW/kg), and a capacitance retention of 80.5% over 5000 cycles. © 2012 American Chemical Society.


Yan R.,Donghua University | Liu J.,Nanjing University of Finance and Economics
International Journal of Innovative Computing, Information and Control | Year: 2012

The robust asymptotic stability problem of genetic regulatory networks with time-varying delays is investigated. Based on a piecewise analysis method, the variation interval of the time delay is firstly divided into two subintervals, and then the convexity property of the matrix inequality and the free weighting matrix method are fully used in this paper. By using a Lyapunov functional approach and linear matrix inequality techniques, the stability criteria for the delayed genetic regulatory networks are expressed as a set of linear matrix inequalities (LMIs), which can lead to much less conservative analysis results. A genetic network example is given to illustrate that the results in this paper are more effective and less conservative than some existing ones. © 2012 ICIC International.


Gao S.,Henan Normal University | Jia X.,Henan Normal University | Yang J.,Donghua University | Wei X.,Henan Normal University
Journal of Materials Chemistry | Year: 2012

This paper reports a simple one-step growth of hierarchically micro/nanostructured porous metallic copper microspheres with high yield at room temperature. The key growth strategy is to use phenol and ascorbic acid as porogen and reducing agents, respectively, to induce the growth of the porous hierarchical micro/nanostructure. The samples are characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and nitrogen adsorption. It is found that the morphology and structure of the porous Cu microspheres are highly dependent on the phenol added. Compared to the commercial Cu powders and Cu sheets with dense internal structure, hierarchically micro/nanostructured porous metallic copper microspheres show excellent superhydrophilic surface property and much higher catalytic activity for the reduction of 4-nitrophenol, demonstrating the significance of the pore structure of the copper materials. Their potential applications in catalysis for oxygen reduction reaction of fuel cells are also explored. All these features make the as-prepared porous copper microspheres a highly attractive candidate for multi-functional materials. © 2012 The Royal Society of Chemistry.


Yang H.-X.,Fuzhou University | Rong Z.,University of Electronic Science and Technology of China | Rong Z.,Donghua University
Physica A: Statistical Mechanics and its Applications | Year: 2015

We study the collective motion of self-propelled agents with the restricted view. The field of view of each agent is an annulus bounded by the outer radius r and inner radius αr, where α is a tunable parameter. We find that there exists an optimal value of α leading to the highest degree of direction consensus. This phenomenon indicates that there exists superfluous communication in the collective motion of self-propelled agents and short-range interactions hinder the direction consensus of the system. The value of optimal α decreases as the absolute velocity increases, while it increases as the outer radius r and the system size increase. For a fixed value of α, direction consensus is enhanced when the absolute velocity is small, the outer radius or the system size is large. ©2015 Elsevier B.V. All rights reserved.


Xu P.,Donghua University | Gu T.,University of Delaware | Cao Z.,University of Delaware | Wei B.,University of Delaware | And 6 more authors.
Advanced Energy Materials | Year: 2014

A stretchable carbon nanotube (CNT) fiber based wire-shaped supercapacitor is fabricated using a prestraining-then-buckling approach. At tensile strains from 0% to 100% or after 20 mechanical stretching-releasing cycles with maximum strain of 100%, the electrochemical properties are not reduced but rather somewhat improved. This may have implications for the integration of wire-shaped supercapacitors with wearable, miniaturized, and portable electronic devices. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


He J.-H.,Donghua University | He J.-H.,Beijing Institute of Technology
International Journal of Nonlinear Sciences and Numerical Simulation | Year: 2010

A fractal harmonic law is proposed to design swimming vest and a moving surface with minimum friction; the differential-difference model is used to optimize breathing cloth, lubrication theory is employed to outline an overall design of a flying car on soft compressible porous mat; the well-known concept of self-lock friction angle gives a new outlook for bullet-proof/stab-proof vest and explosion-proof fabric. The concept of the morph-force can predict twin earthquakes and can explain volcanic eruption and anti-gravity illusion. Space geometry and topology affects gravity greatly, and curved time affects velocity of light and motion of the electrons. When time is curved, energy can be produced enormously. Finally, the Heisenberg uncertainty principle is explained by observing the motion of the Moon in different observation scales from the Earth to an extragalactic celestial object. ©Freund Publishing House Ltd.


Lu Y.,Soochow University of China | Song G.,University of Alberta | Li J.,Donghua University | Li J.,Key Laboratory of Clothing Design and Technology
Applied Ergonomics | Year: 2014

The garment fit played an important role in protective performance, comfort and mobility. The purpose of this study is to quantify the air gap to quantitatively characterize a three-dimensional (3-D) garment fit using a 3-D body scanning technique. A method for processing of scanned data was developed to investigate the air gap size and distribution between the clothing and human body. The mesh model formed from nude and clothed body was aligned, superimposed and sectioned using Rapidform software. The air gap size and distribution over the body surface were analyzed. The total air volume was also calculated. The effects of fabric properties and garment size on air gap distribution were explored. The results indicated that average air gap of the fit clothing was around 25-30 mm and the overall air gap distribution was similar. The air gap was unevenly distributed over the body and it was strongly associated with the body parts, fabric properties and garment size. The research will help understand the overall clothing fit and its association with protection, thermal and movement comfort, and provide guidelines for clothing engineers to improve thermal performance and reduce physiological burden. © 2014 Elsevier Ltd and The Ergonomics Society.


Liu Y.,Dalian University of Technology | Wang Z.,Donghua University | Wang Z.,Brunel University | Wang W.,Dalian University of Technology
Signal Processing | Year: 2011

In this paper, the reliable H∞ filtering problem is investigated for a class of uncertain discrete time-delay systems with randomly occurred nonlinearities (RONs) and sensor failures. RONs are introduced to model a class of sector-like nonlinearities that occur in a probabilistic way according to a Bernoulli distributed white sequence with a known conditional probability. The failures of sensors are quantified by a variable varying in a given interval. The time-varying delay is unknown with given lower and upper bounds. The aim of the addressed reliable H∞ filtering problem is to design a filter such that, for all possible sensor failures, RONs, time-delays as well as admissible parameter uncertainties, the filtering error dynamics is asymptotically mean-square stable and also achieves a prescribed H∞ performance level. Sufficient conditions for the existence of such a filter are obtained by using a new LyapunovKrasovskii functional and delay-partitioning technique. The filter gains are characterized in terms of the solution to a set of linear matrix inequalities (LMIs). A numerical example is given to demonstrate the effectiveness of the proposed design approach. © 2010 Elsevier B.V. All rights reserved.


Liu Y.,Dalian University of Technology | Wang Z.,Donghua University | Wang Z.,Brunel University | Wang W.,Dalian University of Technology
Optimal Control Applications and Methods | Year: 2011

This paper is concerned with the reliable control problem against actuator failures for a class of uncertain discrete-time stochastic nonlinear time-delay systems. The failures of actuators are quantified by a variable varying in a given interval. The stochastic nonlinearities described by statistical means cover several well-studied nonlinear functions as special cases. The time-varying delay is unknown with given lower and upper bounds. The multiplicative stochastic disturbances are in the form of a scalar Gaussian white noise with unit variance. Attention is focused on the analysis and design of a stable controller such that, for all possible actuator failures, stochastic nonlinearities and disturbances, time delays and admissible parameter uncertainties, the closed-loop system is exponentially mean-square stable. A linear matrix inequality approach is developed to solve the addressed problem. A numerical example is given to demonstrate the effectiveness of the proposed design approach. Copyright © 2010 John Wiley & Sons, Ltd.


Liu Y.,Dalian University of Technology | Wang Z.,Brunel University | Wang Z.,Donghua University | Wang W.,Dalian University of Technology
International Journal of Adaptive Control and Signal Processing | Year: 2011

In this paper, the reliable H∞ filtering problem is studied for a class of discrete nonlinear Markovian jump systems with sensor failures and time delays. The transition probabilities of the jumping process are assumed to be partly unknown. The failures of sensors are quantified by a variable taking values in a given interval. The time-varying delay is unknown with given lower and upper bounds. The purpose of the addressed reliable H ∞ filtering problem is to design a mode-dependent filter such that the filtering error dynamics is asymptotically mean-square stable and also achieves a prescribed H∞ performance level. By using a new Lyapunov-Krasovskii functional and delay-partitioning technique, sufficient delay-dependent conditions for the existence of such a filter are obtained. The filter gains are characterized in terms of the solution to a convex optimization problem that can be easily solved by using the semi-definite programme method. A numerical example is provided to demonstrate the effectiveness of the proposed design approach. © 2011 John Wiley & Sons, Ltd.


Xiao H.,Donghua University | Lu Y.,Donghua University | Wang M.,CAS Shanghai Institute of Applied Physics | Qin X.,Donghua University | And 2 more authors.
Carbon | Year: 2013

The influence of gamma-irradiation on the structure and mechanical properties of polyacrylonitrile-based carbon fibers was studied. It was observed that the Young's modulus of the fibers irradiated increased with irradiation dose, increasing to 267 GPa at 300 kGy, a 16.1% improvement compared to that of as-received carbon fiber. However, the tensile strength increased to 5.4 GPa at 30 kGy, i.e., a 17.4% increase, and then dropped to 4.65 GPa at 300 kGy, which is almost the same as for the untreated fiber. Uniform stress model analysis and Raman spectroscopy show that the degree of covalent cross-linking between the graphene planes increased to a maximum at 30 kGy and then remained almost constant with further irradiation. The SEM images show that the degree of surface roughness increased with the increasing irradiation dose. It is believed that when the dose is less than 30 kGy, the increased cross-linking is the dominant effect, and thus improves the tensile strength. On the other hand, further irradiation generates surface flaws, which neutralizes the increase and results in a decrease of tensile strength. © 2012 Elsevier Ltd. All rights reserved.


Rong Z.,University of Electronic Science and Technology of China | Rong Z.,Donghua University | Wu Z.-X.,Lanzhou University | Chen G.,City University of Hong Kong
EPL | Year: 2013

In this paper, we investigate a networked prisoner's dilemma game where individuals' strategy-selection time scale evolves based on their historical learning information. We show that the more times the current strategy of an individual is learnt by his neighbors, the longer time he will stick on the successful behavior by adaptively adjusting the lifetime of the adopted strategy. Through characterizing the extent of success of the individuals with normalized payoffs, we show that properly using the learned information can form a positive feedback mechanism between cooperative behavior and its lifetime, which can boost cooperation on square lattices and scale-free networks. © Copyright EPLA, 2013.


Lin J.,Donghua University | Lin J.,CAS Shanghai Institute of Applied Physics | Tian F.,CAS Shanghai Institute of Applied Physics | Shang Y.,Donghua University | And 3 more authors.
Nanoscale | Year: 2012

We report a facile method to control intra-fiber porosity via varying the relative humidity and inter-fiber voids through the blending of two different polymeric fibers via multi-nozzles spinning of electrospun fibers for selective adsorption of oil from water. This journal is © 2012 The Royal Society of Chemistry.


Lin J.,Donghua University | Lin J.,CAS Shanghai Institute of Applied Physics | Tian F.,CAS Shanghai Institute of Applied Physics | Shang Y.,Donghua University | And 4 more authors.
Nanoscale | Year: 2013

The pollution arising from oil spills is a matter of great concern due to its damaging impacts on the ecological environment, which has created a tremendous need to find more efficient materials for oil spill cleanup. In this work, we reported a sorbent for oil soak-up from a water surface with a high sorption capacity, good selectivity, and excellent reusability based on the hydrophobic-oleophilic fibrous mats that were fabricated via co-axial electrospinning polystyrene (PS) solution as the shell solution and polyurethane (PU) solution as the core solution. The fine structures of as-prepared fibers were regulated by manipulating the spinning voltages, core solution concentrations, and solvent compositions in shell solutions, which were also characterized by field emission scanning electron microscopy, transmission electron microscopy, nitrogen adsorption method, and synchrotron radiation small-angle X-ray scattering. The effects of inter-fiber voids and intra-fiber porosity on oil sorption capacities were well studied. A comparison of oil sorption capacity for the single fiber with different porous structures was also investigated with the help of scanning transmission X-ray microscopy. The results showed that the sorption capacities of the as-prepared sorbent with regards to motor oil and sunflower seed oil can be 64.40 and 47.48 g g -1, respectively, approximately 2-3 times that of conventional polypropylene (PP) fibers for these two same oils. Even after five sorption cycles, a comparable oil sorption capacity with PP fibers was still maintained, exhibiting an excellent reusability. We believe that the composite PS-PU fibrous mats have a great potential application in wastewater treatment, oil accident remediation and environmental protection. © The Royal Society of Chemistry 2013.


Ding Y.,Donghua University | Liu F.,Donghua University | Liu F.,Shandong Normal University | Tang B.,Donghua University
Knowledge-Based Systems | Year: 2012

With deep and broad applications in distributed computing, how to promote cooperation between entities becomes more and more important. Trust has been proven to be essential to enforce cooperative behaviors in distributed environments. To build trust relationship depends on some factors, such as context, behaviors, and experiences, and it is more challenging to accurately measure them. In this paper, we present a context-sensitive trust computing model to address this problem. Firstly, a trust space with fit-degree is defined based on the contextual information and a context-sensitive fit-law is proposed to judge the abilities of entities. Then, a trust computing model is proposed and followed by an expatiated dynamics trust analysis. Next, considering a new entity without trustworthiness can almost not do anything, we further present an algorithm of initial trustworthiness based on the new entity's abilities. The entity's trustworthiness is divided into the initial trustworthiness, the direct trustworthiness, and the recommended trustworthiness. Based on the trustworthiness obtained by the trust fusion algorithm, a mechanism of making trust decision is presented to promote cooperation. The simulation results show that our model can enhance the cooperation among entities. The malicious behaviors can be controlled because of the trustworthiness threshold of services. As such, the honest peers can be incentive, the network stability can be promoted, and the extent of network security can be improved. The proposed dynamic trust computing model is proven to be reasonable, practical, comparable, and workable in distributed services environments. © 2011 Elsevier B.V. All rights reserved.


Hu J.,Shanghai Institute of Technology | Deng W.,Donghua University
Journal of Cleaner Production | Year: 2015

Supercritical fluids have attracted considerable interest as reaction media over the last decade. Supercritical carbon dioxide is a clean and versatile solvent for various processes and synthesis. In this review, supercritical carbon dioxide properties and its industrial applications related to leather technology were summarized. Application of supercritical carbon dioxide on leather making was reviewed in-depth according to individual process to avoid the corresponding pollutions and reduce environmental burden. Due to high investment cost, supercritical carbon dioxide was widely believed to be restricted only to high value-added products. To position this technology in leather industrial production, the economic evaluation was estimated based on published resources. Supercritical carbon dioxide could deliver its potential values in the forthcoming years for greener and cleaner leather production. The aim of this review is to highlight the available opportunities with supercritical carbon dioxide as a potential alternative solution for leather cleaner production. © 2015 Elsevier Ltd.


Yu D.-G.,Donghua University | Gao L.-D.,Beijing University of Chemical Technology | White K.,London Metropolitan University | Branford-White C.,London Metropolitan University | And 2 more authors.
Pharmaceutical Research | Year: 2010

Purpose: To design and fabricate multicomponent amorphous electrospun nanofibers for synergistically improving the dissolution rate and permeation profiles of poorly water-soluble drugs. Methods: Nanofibers were designed to be composed of a poorly water soluble drug, helicid, a hydrophilic polymer polyvinylpyrrolidone as filament-forming matrix, sodium dodecyl sulfate as transmembrane enhancer and mannitol as taste masking agent, and were prepared from hot aqueous co-dissolving solutions of them. An elevated temperature electrospinning process was developed to fabricate the composite nanofibers, which were characterized using FESEM, DSC, XRD, ATR-FTIR, in vitro dissolution and permeation tests. Results: The composite nanofibers were homogeneous with smooth surfaces and uniform structure, and the components were combined together in an amorphous state because of the favorable interactions such as hydrogen bonding, electrostatic interaction and hydrophobic interactions among them. In vitro dissolution and permeation tests demonstrated that the composite nanofibers had a dissolution rate over 26-fold faster than that of crude helicid particles and a 10-fold higher permeation rate across sublingual mucosa. Conclusions: A new type of amorphous material in the form of nanofibers was prepared from hot aqueous solutions of multiple ingredients using an electrospinning process. The amorphous nanofibers were able to improve the dissolution rate and permeation rate of helicid. © 2010 Springer Science+Business Media, LLC.


Ding Y.,Donghua University | Wang Z.,Donghua University | Wang Z.,Brunel University | Ye H.,Donghua University
IEEE Transactions on Control Systems Technology | Year: 2012

The fact that fractional-order models possess memory leads to modeling a fractional-order HIV-immune system. We discuss the necessary conditions for the optimality of a general fractional optimal control problem whose fractional derivative is described in the Caputo sense. Using an objective function that minimizes the infectious viral load and count of infected CD4 + T cells, the optimal control problem is solved for the fractional-order optimality system with minimal dosage of anti-HIV drugs and the effects of mathematically optimal therapy are demonstrated. Simulation results show that the fractional-order optimal control scheme can achieve improved quality of the treatment. © 2011 IEEE.


Zhang Y.,University of Idaho | Huang Y.,Donghua University | Parrish D.A.,U.S. Navy | Shreeve J.M.,University of Idaho
Journal of Materials Chemistry | Year: 2011

Energetic salts based on the 4-amino-3,5-dinitropyrazolate anion and selected nitrogen-rich cations were prepared in high yield by neutralization or metathesis reactions. Their key properties of the resulting energetic salts, such as melting point, thermal stability (169-303 °C), density (1.54-1.84 g cm -3), impact sensitivity (>60 J), heat of formation, and detonation pressure (20.99-32.55 GPa) and velocity (7712-8751 m s -1), were measured or calculated. As highly insensitive energetic materials, salts 9 (32.55 GPa, 8743 m s -1) and 11 (28.85 GPa, 8751 m s -1) are comparable with 1,3,5-triamino-2,4,6-trinitrobenzene (TATB, 31.15 GPa and 8114 m s -1). © 2011 The Royal Society of Chemistry.


Zhang L.,Donghua University | Wang H.,Donghua University | Chen Z.,Donghua University | Wong P.K.,Chinese University of Hong Kong | Liu J.,Donghua University
Applied Catalysis B: Environmental | Year: 2011

Currently, the photocatalytic reactions occurring under solar illumination have attracted worldwide attentions due to a tremendous set of environmental problems. Taking the sunlight into account, it is indispensable to develop highly effective visible-light-driven photocatalysts. Bi2WO6 is one of newly developed visible-light-driven photocatalysts, and its photocatalytic performance is seriously dependent on its structure, morphology and components. This article features recent research progress in the preparation and growth mechanism of Bi2WO6 micro/nano-structures, including nanoplates, nanoparticles, superstructures and thin films. In addition, the advances in the doped Bi2WO6 and Bi2WO6 based composites have also been overviewed. These Bi2WO6 based micro/nano-structures exhibit different photocatalytic performances on the degradation of the organic pollutant as well as the disinfection of the bacteria, and the effects of their structures and components on photocatalytic activities are also compared. © 2011 Elsevier B.V.


Zhu F.,Zhongyuan University of Technology | Zhu F.,Donghua University | Cui S.,Zhongyuan University of Technology | Gu B.,Donghua University
Physics Letters, Section A: General, Atomic and Solid State Physics | Year: 2010

In this Letter, a fractal series-parallel model, which included numerous capillary channels both parallel and perpendicular to the heat flow direction, was established to predict the effective thermal conductivity of fibrous porous material (FPM). The prediction results from the proposed model are compared with calculated values from other theoretical models and experimental data. © 2010 Elsevier B.V. All rights reserved.


Huang Y.,Donghua University | Zhang Y.,University of Idaho | Shreeve J.M.,University of Idaho
Chemistry - A European Journal | Year: 2011

Highly dense nitrogen-rich ionic compounds are potential high-performance energetic materials for use in military and industrial venues. Guanazinium salts with promising energetic anions and a family of energetic salts based on nitrogen-rich cations and the 6-nitroamino-2,4-diazido[1,3,5]triazine anion (NADAT) were prepared and fully characterized by elemental analysis, IR spectroscopy, 1Ha NMR and 13Ca NMR spectroscopy, and differential scanning calorimetry (DSC). The crystal structures of neutral NADAT (2) and its biguanidinium salt 5 were determined by single-crystal X-ray diffraction (2: orthorhombic, Pnma; 5: monoclinic, P21). Additionally, the isomerization behavior of 2 in solution was investigated by proton-decoupled 13C and 15N NMR spectroscopy. All the new salts exhibit desirable physical properties, such as relatively high densities (1.63-1.78a ga cm-3) and moderate thermal stabilities (Td = 130-196°C for 3-10 and 209-257°C for 11-15). Theoretical performance calculations (Gaussiana 03 and Cheetaha 5.0) gave detonation pressures and velocities for the ionic compounds 3-15 in the range of 21.0-30.3a GPa and 7675-9048a ma s-1, respectively, which makes them competitive energetic materials. Bang boom bang: Nitrogen-rich salts based on nitroamino-diazido-s-triazine and guanazine exhibit high density, good thermal stabilities, and positive calculated heats of formation (see scheme). Predicted detonation pressures (21.0-30.3a GPa) and detonation velocities (7675-9048a ma s-1) suggest that these salts have potential as insensitive energetic materials. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Reddy N.,University of Nebraska - Lincoln | Hu C.,University of Nebraska - Lincoln | Hu C.,Donghua University | Yan K.,Donghua University | Yang Y.,University of Nebraska - Lincoln
Applied Energy | Year: 2011

This paper shows that acidic conditions provide substantially higher % acetyl content, intrinsic viscosity and thermoplasticity even at low ratios of acetic anhydride and catalyst concentrations compared to using alkaline conditions for acetylation of oil-and-zein-free distillers dried grains with solubles (DDGS). Conventional methods of carbohydrate and protein acetylation are unsuitable for acetylating DDGS which is a mixture of carbohydrates and proteins. In this research, methods were developed to simultaneously acetylate the carbohydrates and proteins in DDGS using alkaline and acidic catalyses. The effect of various acetylation conditions on the % acetyl content and intrinsic viscosity of DDGS acetates was studied. Acetylation of DDGS was confirmed using FTIR and 1H NMR and thermal behavior of the DDGS acetates was studied using TGA and DSC. The highest % acetyl content obtained was 28.1% (Degree of substitution (DS) of 1.5) under alkaline conditions using an anhydride to DDGS ratio of 3:1 whereas a much higher % acetyl content of 36.1% (DS 2.1) was obtained under acidic conditions even with a lower anhydride to DDGS ratio of 2:1. DDGS acetates obtained using alkaline catalysts also had higher melting temperature and low melting enthalpy and hence exhibit poor thermoplasticity compared to the DDGS acetates obtained using acid catalysts. © 2010 Elsevier Ltd.


Li C.-H.,Donghua University | Li C.-H.,Dezhou University | He J.-X.,Key Laboratory of Textile Science and Technology
Journal of Cleaner Production | Year: 2013

In this research, a facile process combined chitosan adsorption and UV-Fenton advanced oxidation process (CAAOP) has been developed for the treatment and reuse of spent acid dyebaths. The acid dyes in the spent dyebaths are completely removed through the adsorption column filled with chitosan, while most of sodium sulphate and Peregal O-25 (nonionic organic surfactant) can pass through the adsorption column with the water. Although the resulting recycled spent acid dyebaths are reused over ten times as new dyebaths for dyeing with C.I. Acid Red 1, the changes of the color differences and the relative unlevelness properties on dyed fabrics are still remained within the acceptable levels. That is also true for the other shade dye, namely C.I. Acid Yellow 11, in the 11th recycling cycle. As a result, an average saving of 87.4%, 91.7% and 50.1% for water, sodium sulphate and Peregal O-25, respectively, is achieved with the reuse process for the total eleven dyebaths. The exhausted chitosan can be easily recovered by dilute alkali as a desorbing agent, and the emissions from the two eluted concentrates treated with UV-Fenton are found to meet the most stringent emission standards for both COD and color in China. Results reveal that CAAOP is a promising process for the treatment and reuse of textile dyeing wastewaters, which can benefit the environment and reduce the operating cost. © 2013 Elsevier Ltd. All rights reserved.


Zhang S.,Donghua University | Wang Z.,Donghua University | Wang Z.,Brunel University | Ding D.,Donghua University | Shu H.,Donghua University
IEEE Transactions on Fuzzy Systems | Year: 2014

In this paper, the H output-feedback control problem is investigated for a class of discrete-time fuzzy systems with randomly occurring infinite distributed delays and channel fadings. A random variable obeying the Bernoulli distribution is introduced to account for the probabilistic infinite distributed delays. The stochastic Rice fading model is employed to simultaneously describe the phenomena of random time delays and channel fadings via setting different values of the channel coefficients. The aim of this paper is to design an H output-feedback fuzzy controller such that the closed-loop Takagi-Sugeno (T-S) fuzzy control system is exponentially mean-square stable, and the disturbance rejection attenuation is constrained to a given level by means of the H performance index. Intensive analysis is carried out to obtain sufficient conditions for the existence of desired output-feedback controllers, ensuring both the exponential mean-square stability and the prescribed H performance. The cone-complementarity linearization algorithm is utilized to cast the controller design problem into a sequential minimization: one that is solvable by the semi-definite programming method. A simulation result is exploited to illustrate the usefulness and effectiveness of the proposed design technique. © 2013 IEEE.


Ding D.,Donghua University | Wang Z.,Donghua University | Wang Z.,Brunel University | Shen B.,Donghua University
International Journal of General Systems | Year: 2014

Sensor networks comprising of tiny, power-constrained nodes with sensing, computation, and wireless communication capabilities are gaining popularity due to their potential application in a wide variety of environments like monitoring of environmental attributes and various military and civilian applications. Considering the limited power and communication resources of the sensor nodes, the strategy of the distributed information processing is widely exploited. Therefore, it would be interesting to examine how the topology, network-induced phenomena, and power constraints influence the distributed filtering performance and to obtain some suitable schemes in order to solve the addressed distributed filter design problem. In this paper, we aim to survey some recent advances on the distributed filtering and distributed state estimation problems over the sensor networks with various performance requirements and/or randomly occurring network-induced phenomena. First, some practical filter structures are addressed in detail. Then, the developments of the distributed Kalman filtering, distributed state estimation based on the stability or mean-square error analysis, and distributed filtering are systematically reviewed. In addition, latest results on the distributed filtering or state estimation over sensor networks are discussed in great detail and some challenges are highlighted. Finally, some concluding remarks are given and some possible future research directions are pointed out. © 2014 © 2014 Taylor & Francis.


Xu Y.,Yunyang Teachers College | Yang H.,China Three Gorges University | Tong D.,Donghua University | Wang Y.,South-Central University for Nationalities
Nonlinear Dynamics | Year: 2013

In this paper, the analysis problem of adaptive exponential synchronization in pth moment is considered for stochastic complex networks with time varying multi-delayed coupling. By using the Lyapunov-Krasovskii functional, stochastic analysis theory, several sufficient conditions to ensure the mode adaptive exponential synchronization in pth moment for stochastic delayed complex networks are derived. To illustrate the effectiveness of the synchronization conditions derived in this paper, a numerical example is finally provided. © 2013 Springer Science+Business Media Dordrecht.


Wei G.,Donghua University | Wang Z.,Brunel University | Shen B.,Donghua University
IEEE Transactions on Automatic Control | Year: 2010

In this technical note, the quadratic error-constrained filtering problem is formulated and investigated for discrete time-varying nonlinear systems with state delays and non-Gaussian noises. Both the Lipschitz-like and ellipsoid-bounded nonlinearities are considered. The non-Gaussian noises are assumed to be unknown, bounded, and confined to specified ellipsoidal sets. The aim of the addressed filtering problem is to develop a recursive algorithm based on the semi-definite programme method such that, for the admissible time-delays, nonlinear parameters and external bounded noise disturbances, the quadratic estimation error is not more than a certain optimized upper bound at every time step k. The filter parameters are characterized in terms of the solution to a convex optimization problem that can be easily solved by using the semi-definite programme method. A simulation example is exploited to illustrate the effectiveness of the proposed design procedures. © 2006 IEEE.


Zhao Q.,Donghua University | Sun J.,Donghua University | Li J.,Donghua University | He J.,Donghua University | He J.,Key Laboratory of Textile Science and Technology
Catalysis Communications | Year: 2013

Homer-Wadsworth-Emmons (HWE) reaction of diethyl benzylphosphonate (DEBP, pKa = 27.55) with aldehyde was performed in a solid-liquid phase-transfer catalysis (SL-PTC) system using sodium hydroxide as the solid phase. Various parameters that influenced the pseudo-first-order rate constant including stirring speed, catalysts, salt, water and temperature were investigated to explore the process of the generation and transfer of the active intermediate. A reasonable interfacial mechanism of the PTC reaction of the weakly acidic substrate was proved for the first time. HWE reactions under SL-PTC conditions showed high activity and geometric selectivity. It is anticipated that this simple and controllable synthesis method should provide a new idea for HWE reaction in chemical industry. © 2013 Elsevier B.V.


Jiang Q.,Key Laboratory of Textile Science and Technology | Jiang Q.,Donghua University | Wang X.,North Carolina State University | Zhu Y.,North Carolina State University | And 3 more authors.
Composites Part B: Engineering | Year: 2014

Carbon nanotubes (CNTs) have high strength and modulus, large aspect ratio, and good electrical and thermal conductivities, which make them attractive for fabricating composite. The poly(biphenyl dianhydride-p-phenylenediamine) (BPDA/PDA) polyimide has good mechanical and thermal performances and is herein used as matrix in unidirectional carbon nanotube composites for the first time. The strength and modulus of the composite increase by 2.73 and 12 times over pure BPDA-PDA polyimide, while its electrical conductivity reaches to 183 S/cm, which is 1018 times over pure polyimide