Lin L.,Dalian Polytechnic University |
Zhai S.-R.,Dalian Polytechnic University |
Xiao Z.-Y.,Dalian Polytechnic University |
Song Y.,Dalian Polytechnic University |
And 2 more authors.
Bioresource Technology | Year: 2013
In continuation of previous work on utilizing rice husks, this study aimed to prepare mesoporous activated carbons using residues of sodium hydroxide-pretreated RHs, and then examine their dye adsorption performance. The influences of the activation temperature and activation time on the surface area, pore volume, and pore radius of the activated carbon were investigated based on nitrogen adsorption/desorption isotherms and transmission electron microscopy. The adsorptive behavior of the mesoporous activated carbons obtained under optimum preparation conditions was evaluated using methyleneblue as the model adsorbate. The adsorption kinetics was studied by pseudo-first-and pseudo-second-order models, and the adsorption isotherms were studied by Langmuir and Freundlich models. The pseudo-second-order model and Langmuir isotherm were found to fit well the adsorption characteristics of the as-prepared mesoporous activated carbons. Thermodynamic data of the adsorption process were also obtained to elucidate the adsorption thermo-chemistry between the activated carbons produced from NaOH-pretreated RHs and MB molecules. © 2013 Elsevier Ltd.
Wang Y.,Dalian Polytechnic University
MATEC Web of Conferences | Year: 2016
China is a country with the most abundant forms of traditional books, and the evolution of book forms has special material characteristics. The Paper meets the demands of people on multi-sensory stimulation and spiritual experience not only through sense of touch taken as one of human body's multiple senses, but also through analyzing and researching the tactile materials generated based on the sense of touch and discussing how the tactile materials change the single visual experience of traditional paper media. Unique emotional experience and interactive experience brought by the tactile materials are the future book development direction. Through discussing application to contemporary culture and design thinking and introspection and more profoundly understanding the cultural connotation and the artistic value of the books, a newer way of development is provided for future development of paper books. © Owned by the authors, published by EDP Sciences, 2016.
Zhang X.,Dalian University of Technology |
Zhang X.,Dalian Polytechnic University |
Quan X.,Dalian University of Technology |
Chen S.,Dalian University of Technology |
Yu H.,Dalian University of Technology
Applied Catalysis B: Environmental | Year: 2011
Graphene (Gr)/InNbO4 composite with visible light response was fabricated by a facile one-step hydrothermal method. The prepared samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and diffuse reflectance UV-vis spectra (DRS), respectively. The results indicated that InNbO4 particles with monoclinic type mainly distributed on the Gr sheet uniformly. The samples had good visible light response. Photocatalytic degradation of Methylene Blue (MB) was conducted under the visible light irradiation (>400nm) in order to evaluate the photoactivity of this photocatalyst. The kinetic constant of MB removal with Gr/InNbO4 (0.0346min-1) was 1.87 times that with InNbO4 (0.0185min-1). The enhanced photocatalytic performance of Gr/InNbO4 was attributed to the improved adsorption performance and the separation efficiency of the carriers. With Gr/InNbO4 as the photocatalyst the OH radicals be another type of oxidant in the photocatalytic process in addition to holes and electrons on Gr transporting from InNbO4 participated the oxidation of MB adsorbed on Gr. Overall, the result of this work could provide a new way of the construction of a visible-light-driven photocatalyst with high performance. © 2011 Elsevier B.V.
Deng T.-B.,Toho University |
Qin W.,Dalian Polytechnic University
Signal Processing | Year: 2013
Although the coefficient-relation of the even-order sub-filters in the Farrow structure has been revealed and adopted in the weighted-least-squares (WLS) design of even-order finite-impulse-response (FIR) variable fractional-delay (VFD) digital filters in the literature, it has never been exploited in implementing low-complexity VFD filters. This paper aims topropose a low-complexity implementation structure through exploiting the coefficient-relation such that the coefficient-relation is not only utilized in the design process, but also utilized in the low-complexity implementation; formulate the minimax design of an even-order VFD filter through exploiting the coefficient-relation;propose a new two-stage scheme called increase-then- decrease scheme for optimizing the sub-filter orders so as to minimize the VFD digital filter complexity.With the above three advances, an even-order VFD filter can not only be designed and but also be implemented efficiently by exploiting the coefficient-relation. We will use a design example to illustrate the low complexity and high design accuracy. © 2012 Elsevier B.V. All rights reserved.
Deng T.-B.,Toho University |
Qin W.,Dalian Polytechnic University
Signal Processing | Year: 2014
This paper presents a bi-minimax method for designing an odd-order variable fractional-delay (VFD) finite-impulse-response (FIR) digital filter such that both the peak errors of its variable frequency response (VFR) and VFD response can be simultaneously suppressed. The bi-minimax design iteratively minimizes a mixed error function involving both the VFR-peak-error and VFD-peak-error subject to the second-order-cone (SOC) constraints on the VFR errors and linear-programming (LP) constraints on the VFD errors. As compared with the existing SOC-based minimax design that minimizes the VFR-peak-error only, this odd-order bi-minimax design suppresses the VFD-peak-error and flattens both the VFR errors and VFD errors simultaneously. Consequently, both the two errors are made nearly equi-ripple (bi-equiripple). An example is given for showing the simultaneous suppression of the two kinds of peak errors and verifying the effectiveness of the odd-order bi-minimax design approach. © 2013 Elsevier B.V.
Zhao C.,Dalian University of Technology |
Xu X.,Dalian University of Technology |
Chen J.,Dalian University of Technology |
Wang G.,Dalian Polytechnic University |
Yang F.,Dalian University of Technology
Desalination | Year: 2014
A composite microfiltration membrane, prepared by blending polyvinylidene fluoride (PVDF) and hydrophilic graphene oxide (GO) nanosheets, was successfully used in a submerged membrane bioreactor system. Scanning electron microscopy (SEM), contact angle measurements, and X-ray photoelectron spectroscopy were used to determine the surface properties of GO modified PVDF membrane. To compare the composite membrane with a commercial PVDF membrane, the critical flux, fouling behavior, membrane resistance, and anti-fouling properties against extracellular polymeric substances (EPS) were studied. Higher critical flux was obtained by PVDF/GO composite membrane due to the change of surface characteristics. The PVDF/GO composite membrane demonstrated sustained permeability, lower cleaning frequency, and filtration time that was three times longer than that of the PVDF membrane. In terms of anti-EPS accumulation, the PVDF/GO composite membrane showed lower membrane resistance, particularly, lower pore plugging resistance than the PVDF membrane. Fewer amounts of EPS, specifically polysaccharide accumulated on the composite membrane surface due to the introduction of GO nanosheets. The SEM and confocal laser scanning microscope images showed that the cake layer on composite membrane was looser and thinner than that of commercial PVDF membrane. Consequently, membrane surface was exposed, resulting in the maintenance of high permeability over a long period of time. © 2014 Elsevier B.V.
Xiao Z.-H.,CAS Suzhou Institute of Nano Technology and Nano Bionics |
Zheng L.,Dalian Polytechnic University |
Lin H.,CAS Suzhou Institute of Nano Technology and Nano Bionics
Optics Express | Year: 2012
Photoinduced diffraction grating is theoretically investigated in a three-level ladder-type hybrid artificial molecule comprised of a semiconductor quantum dot (SQD) and a metal nanoparticle (MNP). The SQD and the MNP are coupled via the Coulomb interaction. The probe absorption vanishes under the action of a strong coupling field, indicating an effect of electromagnetically induced transparency (EIT). Based on this EIT effect, diffraction grating is achievable when a standing-wave coupling field is applied. It turns out that the efficiency of diffraction grating is greatly improved due to the existence of the MNP. Furthermore, the diffraction efficiency can be controlled by tuning the interaction strength between the SQD and the MNP. Nearly pure phase grating is obtained, showing high transmissivity and high diffraction efficiency up to 33%. © 2012 Optical Society of America.
Liu B.-Y.,Dalian Polytechnic University
Chung-kuo Tsao Chih/China Pulp and Paper | Year: 2010
The macro analysis of the energy consumption development of china's pulp and paper industry indicated that it was reduced from 1.76 tce/t paper product in 1985 to 0.46 tce/t paper product in 2007. At the same time, the micro analysis on the energy consumption of different paper machines, different raw materials, different pulping equipment, different chemical pulps with different processes, as well as high yield pulp and waste paper pulp was carried out.
Chen L.F.,Dalian Polytechnic University
Advanced Materials Research | Year: 2013
Gadolinium-doped ZnO nanocrystalline powders were prepared by hydrothermal method using ionic liquid (1-heptyl-3-methyl imidazole bromide) as template. The crystal structure, grain size and optical properties of the samples were characterized by X-ray diffractometry, scanning electron microscopy and UV-Vis spectroscopy. The photocatalytic degradation of KN-R dye under simulated sunlight was chosen as a model reaction to evaluate the photocatalytic activities of the undoped and doped ZnO nanocrystalline catalysts. It was shown that Gadolinium was successfully doped into ZnO powders, and thus showing enhanced performance in degradation of KN-R. © (2013) Trans Tech Publications, Switzerland.
Li H.,Soochow University of China |
Liu R.,Soochow University of China |
Lian S.,Soochow University of China |
Lian S.,Dalian Polytechnic University |
And 3 more authors.
Nanoscale | Year: 2013
Selective oxidation of alcohols is a fundamental and significant transformation for the large-scale production of fine chemicals, UV and visible light driven photocatalytic systems for alcohol oxidation have been developed, however, the long wavelength near infrared (NIR) and infrared (IR) light have not yet fully utilized by the present photocatalytic systems. Herein, we reported carbon quantum dots (CQDs) can function as an effective near infrared (NIR) light driven photocatalyst for the selective oxidation of benzyl alcohol to benzaldehyde. Based on the NIR light driven photo-induced electron transfer property and its photocatalytic activity for H2O2 decomposition, this metal-free catalyst could realize the transformation from benzyl alcohol to benzaldehyde with high selectivity (100%) and conversion (92%) under NIR light irradiation. HO is the main active oxygen specie in benzyl alcohol selective oxidative reaction confirmed by terephthalic acid photoluminescence probing assay (TA-PL), selecting toluene as the substrate. Such metal-free photocatalytic system also selectively converts other alcohol substrates to their corresponding aldehydes with high conversion, demonstrating a potential application of accessing traditional alcohol oxidation chemistry. © The Royal Society of Chemistry 2013.