bluuebunny/crossref_metadata_2025 huggingface dataset:
Polyurethane Foaming Process Modelling by Finite Point Method
Authors: Abdessalam Hichem , Abbès Boussad , Li Yu Ming , Guo Ying Qiao , Kwassi Elvis , Romain J.L.
Published: January 2014

Polyurethane foaming process is under fluid mechanics with complex geometries, its numerical modelling by using the classical grid methods such as the finite element method and the finite volume method can cause problems related to the mesh deformation. In order to avoid these problems a mesh free Lagrangian method developed by Kuhnert called Finite Point Method (FPM) is used in this study. The FPM consists in representing the fluid domain by a set of particles. It is proved efficient in the numerical modelling of polyurethane foaming. In this model, the chemical kinetics contribution and the rheological coupling are adopted and the expansion of the mixture is governed by the front velocity which is calculated by solving the Navier-Stokes equations. The numerical results for polyurethane foaming process in a conical beaker using the FPM are compared with the experimental results.
Synergistic Effects of Nanoporous Nickel Phosphates VSB-1 on Intumescent Flame Retardant Polypropylene Composites
Authors: Peng Chao , Nie Shi Bin , Liu Lei , He Qi Lin , Hu Yuan , Gao Fei
Published: January 2014

Nanoporous nickel phosphates (VSB-1) was synthesized by hydrothermal method. Then VSB-1 was added to the ammonium polyphosphate and pentaerythritol system in polypropylene (PP) matrix.The synergistic effect of VSB-1 with intumescent flame retardants (IFR) was studied by cone calorimetry test. The results of cone calorimetry show that heat release rate peak (pHRR) and total heat release (THR) of intumescent flame retardant PP with 2wt% VSB-1 decrease remarkably compared with that of without VSB-1. The pHRR and THR decrease respectively from 1140 to 286.0 kW/m2, and from 96.0 to 63.2 MJ/m2.
Alignment and Surface Modification of Multiwall Carbon Nanotubes Polymeric Composites
Authors: Wang Ming Wen
Published: January 2014

Polymer matrices add carbon nanotubes have significantly improved mechanical and electrical properties at very low carbon nanotube loading. That mechanical and electrical properties of aligned composites are better than those of random ones has been demonstrated in past studies. The non-conductive barriers of surface contaminants and weakly bound polymer layers will deform on the surface of composite resulted from the effects of micro gravity and oxidization. Addition of the adaptive plasma modification makes improvement in the surface properties of the composites is necessary. In this study, we actively align and network multiwall carbon nanotubes (MWCNTs) in a polymer matrix, then adopt O2/CF4radio frequency (RF) plasma to modify the surface of polymeric composite. MWCNTs were aligned using an AC electric field to elicit dipolar interactions among the nanotubes in a viscous matrix following immobilization by curing under continuous application of an anisotropic electric field, and the barriers of surface contaminants and weakly bound polymer layers can be reduced to the smallest degree or eliminated by RF plasma modification. Consequently, the MWCNTs polymeric composite amplify the flexural modulus, wear resistance, and electrical conductivity in the reality.
Facile Fabrication and Enhanced Photoluminescence Property of Zn(II) Coordination Polymers with 2,2'-biquinoline-4,4'-dicarboxylic Acid
Authors: Deng Bin , Huang Hai Ying , Li Qiang Guo
Published: January 2014

With 2,2'-biquinoline-4,4'-dicarboxylic acid disodium salt (BCA) and Zn (CH3COO)2·2H2O as starting materials, a sheaflike Zn (II)-2,2'-biquinoline-4,4'-dicarboxylic acid disodium salt coordination polymers (Zn-BCA CPs) has been successfully synthesized through a simple and mild one-step process in aqueous solution at room temperature. The effects of reactant molar ratio, temperature and reaction time on the morphology of the coordination polymers have also been examined. It was found that the Zn-BCA CPs showed an greatly enhanced blue photoluminescence emission compared with Zn-free BCA.
Effects of MPBM on Crosslinking Density and Mechanical Properties of Tetrafluoroethylene-Propylene Copolymer
Authors: Lu Jiang Rong , Wang Yu Feng , Yan Pu Xuan , Han Fei Xue
Published: January 2014

The composites of tetrafluoroethylene-propylene copolymer (TFE-P copolymer)/N, N'-metaphenylene-bis-maleimide (MPBM)/DCP were prepared by mill. The effects of MPBM on the crosslinking density and mechanical properties of TFE-P copolymer were investigated by equilibrium swelling method, MDR rheometer and electric tensile testing machine. The results show that MPBM can efficiently increase the crosslinking density of TFE-P copolymer cured with peroxide. There is a linear relationship between MPBM and the crosslinking density while MPBM is less than 5 phr.; due to the resinification and reinforcing effect of micro-zone of MPBM resin, the crosslinking degree and the modulus of the composite increase faster while MPBM is used more than 5 phr. Perfect network and mechanical properties could be obtained by regulating the amount of MPBM in peroxide curing system.
Wood Smoke Impact on Particulate Matter (PM)
Authors: Ge Peng
Published: January 2014

The emission factors and emission profiles of wood combustion tracers of different wood types were assessed. Emission profiles are additionally assessed for two advanced oven/boiler types. The emission profiles and emission ratios of wood smoke tracers to the PM emission of wood fires for the major tree species were established. From this a wood smoke profile will be derived which will be used to assess the impact of wood smoke to selected PM10and PM2.5sampling sites. Furthermore, using the energy-normalised PM mass emission data from different types of wood combustion appliances PM reduction scenarios will be assessed with the goal of a sustainable use of wood or wood-based fuels.
Fabrication of the ZnS-ZnO Composite Film by Sulfurizing the as-Electrodeposited ZnO Film
Authors: Wang Zi Feng , Liu Yong Zhao , Liu Yu Shan , Zhang Jian Min
Published: January 2014

The ZnS-ZnO composite film was successfully prepared by sulfidation of the as-electrodeposited ZnO film in the aqueous solution of zinc nitrate and hexamethylenetetramine. The ZnO film was electrodeposited on the substrate of indium-tin oxide (ITO) glass, and then the sodium sulfide solution was used to convert the ZnO film into the ZnS-ZnO composite film. The products were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectrometer (EDS) and UVvisible absorption. The experimental results show that the composite film on ITO glass still retained the morphology of as-electrodeposited ZnO coating, and is composed of ZnS with cubic structure and ZnO with hexagonal structure.
Investigate of Phase Compositions and Microstructure of MgO-C through In Situ Nitride
Authors: Zhang Xiao Jun , Peng Nai , Deng Cheng Ji , Zhu Hong Xi , Yuan Wen Jie
Published: January 2014

In this paper, the phase compositions and microstructure of MgO-C samples containing Si powder in N2sintered at 1350-1500°C were investigated by X-ray diffraction (XRD) and scanning electron microscope (SEM). The α-Si3N4, β-Si3N4, MgSiN2and SiC phases have formed together with MgO and C phases in the sintered samples. The morphologies of β-Si3N4crystals were almost in the shape of rod-like through the α-β phase transformation of Si3N4by Mg-Si-O-N and silicon liquid. The morphologies of α-Si3N4crystals were in the shape of equiaxed. The morphology of MgSiN2crystals was in the shape of polyhedron with the size of 5 μm.
Efffect of Spark Plasma Sintering Temperature on Mechanical Properties of In Situ TiB/Ti Composites
Authors: Shen Xiang Bo , Zhang Zhao Hui , Cao Mao Sheng , Wang Fu Chi
Published: January 2014

The in-situ synthesized TiB reinforced titanium matrix composites have been prepared by spark plasma sintering technique at 950–1250°C, using mixtures of 10wt% TiB2 and 90wt% Ti powders. The effects of the sintering temperature on the mechanical properties (Vickers microhardness, yield strength and Young`s modulus) of the composites were investigated. SEM was used to analyze the reaction process and the microstructure of the compacts synthesized at different sintering temperatures. The results indicated that the in situ synthesized TiB grow rapidly with increasing sintering temperature. The composite sintered at 1250°C have the highest relative density of 99.2%. However, the composite sintered at 950°C exhibits the best Vickers microhardness of 4.64GPa and yield strength of 989MPa, respectively.
Determination of 17β-Estradiol Based on Electropolymerized-Molecularly Imprinted Polymer on Gold Nanoparticles-Graphene Modified Electrode
Authors: Li Tian Hua , Wang De , Lan Hang Zhen , Gan Ning
Published: January 2014

An electrochemical sensor for estradiol was prepared by a molecularly imprinted polymer (MIP) film and its recognition properties for estradiol were investigated. The polypyrrole (PPy) film was prepared by electropolymerizing pyrrole on gold nanoparticles (Au NPs) and graphene (Gs) modified glassy carbon (GC) electrode. The electrochemical response of 17β-Estradiol (17β-E2) at the imprinted PPy-Gs-Au/GC electrode was investigated by cyclic voltammetry. The results indicated that the imprinted PPy-Gs-Au/GC electrode can effectively improve the electrochemical signal of 17β-E2 and eliminate interferences of other interfering substances. The results showed that a wide detection linear range (3.0 × 10-9 1.0 × 10-6 mol L-1) for the determination of 17β-E2 with the low detection limit of 1.0 × 10-9 mol L-1 (S/N = 3) was obtained. The proposed sensor exhibited fast balance response time of 10 min, which is propitious to rapid detect 17β-E2 in real samples. The merits of the imprinted electrode suggested an attractive and broadly applicable way for developing the chemical sensor used for the estrogen detection.
Preparation of Nano t-ZrO2 Particle by the Integrated Process of High-Gravity Field and Hydrothermal Crystallization
Authors: Liu Si Wei , Zhou Ji Cheng , Liu Rui Xing
Published: January 2014

ZrO2nano-crystals have been prepared through the integrated process of high-gravity field and hydrothermal crystallization by using ZrOCl2•8H2O solution added scale 3mol% yttrium nitrate and precipitator ammonia. Precursor of ZrO2powders was prepared by high-gravity field co-precipitation reaction. Then, the precursor crystallized by the hydrothermal method to obtain ZrO2powders. The influence of hydrothermal crystallization temperature and hydrothermal crystallization time on crystal structure, morphology and grain size has been investigated. The structure, morphology and grain size of ZrO2were characterized by X-ray diffraction(XRD) , transmission electron microscopy( TEM).The sizes of pure tetragonal ZrO2nano-crystallites prepared by hydrothermal crystallizing at 175°C-200°C for 1-8h are observed to be typically in the rang of 4-10nm. What’s more, ZrO2powders prepared from crystallizing at 200°C for 6h shows great crystallinity , uniformly particle size and low aggregate.
Effect of Polyvinylpyrrolidone on the Preparation of Silver Nanowires
Authors: Li Si Fang , Zhang Hai Yan
Published: January 2014

Polyvinylpyrrolidone (PVP) has been used to control size and shape of metal nanoparticles in aqueous solution, where PVP plays the dual role of protective and reducing agent. The influence of PVP with different molecular weight on the aspect ratio of nanorods and nanowires during a classical polyol process was studied. Nanowires with higher aspect ratio were obtained by using PVP with higher molecular weight. It is suggested that the reduction rate is decreased with an increase of the molecular weight of PVP, leading to the growth of nanowires with higher aspect ratio.
Comparative Study about Cytotoxicity with CuO Engineered Nanoparticles, TiO2 Engineered Nanoparticles, CeO2 Engineered Nanoparticles, Single-Walled Carbon Nanotubes
Authors: Men Shao Kun , Cao Xue Song , Wang Zhen Yu
Published: January 2014

Engineered nanoparticles have been extensively used in electronics, energy, materials and biomedical areas. Engineered nanoparticles with unique magnetic, luminescent, and catalytic properties can not only benefit human society, but also cause potentially harmful interactions with living systems. This study was aimed at assessing the cytotoxicity of CuO ENPs, TiO2ENPs, CeO2ENPs, SWCNTs in human lung epithelial cell line (A549). Herein, we performed a comprehensive study on the cytotoxicity of four different ENPs by examining the viability of A549 cells. The results showed that CuO ENPs could cause a highest dose-dependent cytotoxicity, SWCNTs were more toxic than TiO2ENPs and CeO2ENPs to A549 cells, TiO2ENPs induced a slight loss of cell viability at 100 mg/L and CeO2ENPs had no obvious cytotoxicity. These effects were dose related, and should be considered in the application of different areas of ENPs.
Facile Preparation of Cu(OH)2@TiO2 Nanowire Arrays for Photoelectrochemical Water Splitting
Authors: Yan Dan , Shi Wei Dong , Fan Wei Qiang
Published: January 2014

Cu (OH)2@TiO2nanowire arrays (NWAs) on the Fluorine-doped tin oxide (FTO) substrates had been fabricated via an simple and facile deposition method. The as-prepared Cu (OH)2@TiO2NWAs were subsequently characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-Ray diffraction (XRD), UVVis diffuse reflectance spectra (DRS), X-ray photoelectron spectrometer (XPS) and photoelectrochemical measurements. This results suggested that the Cu (OH)2@TiO2NWAs efficiently impeded the recombination between photoelectrons and holes. Therefore, this approach would afford a simple, effective, facile and low-cost method for preparation photoanode, which would enhance the hydrogen generating capability of TiO2from water splitting.
Toxicity of CuO Engineered Nanoparticles to Eichhornia crassipes
Authors: Liu Li Jiao , Xu Ya Nan , Wang Zhen Yu
Published: January 2014

Nanomaterials are touching almost every aspect of modern life in recent years and attract the attention of scientists, becoming a hot research in a short time. The extensively use of engineered nanopaticles (ENPs) has increased the risk of ENPs entering into aquatic environments. This study outlines nanotoxicity on large aquatic plants which plays important role in aquatic system. A series of concentrations of copper oxide engineered nanoparticles (CuO ENPs) were used to test the nanotoxicity to aquatic plant Eichhornia crassipes. Results showed that inhibition of plant growth was significant after exposed to CuO ENPs at the concentration of 50 mg/L. the inhibition to the root lengh was obvious. The leaf epidermis was severely damaged. All the results showed that CuO ENPs had nanotoxicity to Eichhornia crassipes and the water system.
Preparation of Iron Carbide from High Phosphorus Oolitic Hematite
Authors: Li Guang Qiang , Wang Heng Hui , Yang Jian , Ma Jiang Hua
Published: January 2014

In order to find a new way to utilize the high phosphorus oolitic hematite ore as raw material for steelmaking, the reduction and carburization of high phosphorus oolitic hematite by the gas of CH4-H2were studied. High phosphorus oolitic hematite, reduction and carburization products were investigated by the means of XRD and scanning electron microscope. The SEM-EDS and XRD analysis show that the main compositions of this ore are hematite and quartz, main microstructure is oolitic cluster with the zonal distribution of hematite and apatite, and iron carbide can be prepared from high phosphorus oolitic hematite.
The Study of nano-SiO2/Polyacrylate Core-Shell Hybrid Emulsions
Authors: Hou Fa Qiu , Qing Ning , Chen Yong Jun
Published: January 2014

nano-SiO2 modified core-shell polyacrylate composite emulsion was synthesized by seeded semi-continuous starved pre-emulsion polymerization and sol-gel technique. The influence of 3-methacryloxypropyltrimethoxysilane(KH-570), tetraethoxysilane(TEOS) on the properties of emulsion and film were studied. The SiO2/silicone polyacrylate composite latex and the resultant films were characterized by fourier transform infrared spectroscopy(FT-IR), differential scanning calorimeter(DSC), thermogravimetric analysis(TGA), water contact angle goniometer (WCAG). The results showed that organic silicon and nano-SiO2 were effectively grafted to the polyacrylate molecular chain. We can observed there are two glass transition temperatures (Tg) in the DSC curve. The water contact angle (WCA) on the PAE film and SSPAE film separately attained 62.5°and 85.5°.
Facile Preparation and Photocatalytic Activity of TiO2 Microspheres with a Diameter of 1-8 μm
Authors: Kang Shi Zhao , Bo Lin Yuan , Li Xiang Qing , Zhou Qin , Mu Jin
Published: January 2014

TiO2 microspheres were prepared in a solvothermal process without involving any templates. Meanwhile, the photocatalytic activity of TiO2 microspheres was studied using p-nitrophenol as a probe. The results indicate that the anatase TiO2 microspheres with a diameter of 1-8 μm can be obtained using this simple method. Moreover, the as-prepared TiO2 microspheres display relatively high visible photocatalytic activity with 35.6% of degradation ratio of p-nitrophenol after 150 min irradiation.
Preparation of HgS Nanoparticles with Adjustable Dispersibility at Water/n-butyl Alcohol Interface
Authors: Zhou Rui Xue , Zhang Yun Yan , Kang Shi Zhao , Li Xiang Qing , Mu Jin
Published: January 2014

HgS nanoparticles with adjustable dispersibility have been synthesized at the water/n-butyl alcohol interface and characterized with Xray diffraction, transmission electron microscopy. Meanwhile, the dispersibility of the asprepared HgS nanoparticles in water and nbutyl alcohol were measured, respectively. The results indicate that the cubic HgS nanoparticles could be obtained; and the dispersibility of the HgS nanoparticles can be simply tuned. When Hg (CH3COO)2 aqueous solution and nbutyl alcohol solution of thioacetamide are used, the asprepared HgS nanoparticles can be dispersed in water to form a solutionlike suspension. In contrast, when thioacetamide aqueous solution and nbutyl alcohol solution of Hg (CH3COO)2 are used, the oil dispersible HgS nanoparticles are obtained. Moreover, the mechanism about the adjustable dispersibility of HgS nanoparticles is discussed.
New Insight into Wettability Alteration to Gas Wetness: Core Experiment and Modeling
Authors: Zhou Ming Hui , Sun Wen Jie
Published: January 2014

Many attentions have been paid on wettability alteration to gas wetness since it is widely concerned in 2000. Although many researchers tried to explain or realize such phenomenon, several problems have not been resolved now including possibility and mechanism of wettability alteration in water saturated cores. In this study, new insight is made into wettability alteration to gas wetness, both experimental and simulate. A serial of spontaneous water imbibition experiments are conducted to evaluate applicability of wattability alteration in different water saturated cores. SEM observation indicates microcosmic mechanism by compare of pore surface before and after chemical treatment. Numerical simulation in Eclipse gives theoretical evidence of wettability alteration phenomenon and also proves almost the same result with that in spontaneous water imbibition experiments.
Preparation of Supported Fe/SiO2 Catalyst and its Catalytic Performance for Wastewater Treatment
Authors: Li Hong Ya , Yan Biao , Zhao Bin Xia , Zhang Xiao Li
Published: January 2014

The catalyst Fe/SiO2 was prepared by impregnation method and used as catalyst for treating the dye wastewater by catalytic wet peroxide oxidation method. The catalyst preparation process was optimized, and under the conditions of: the particle size of catalyst carrier was 0.125-0.200 mm, concentration of iron nitrate was 1.10mol/L, calcination temperature was 600 °C, and calcination time was 4h, the catalyst has higher activity and better stability in treating the wastewater.
Removal of Manganese(II) Ions from Wastewater by H2O2 as Oxidant
Authors: Yang Wen Qiang , An Juan , Yin Jian Guo , Yuan Xiao Li , Xia Wen Tang
Published: January 2014

Removal of manganese (II) ions from wastewater by H2O2as oxidant was studied. Effects of reaction temperature, hydrogen peroxide concentration, reaction time and calcium oxide concen-tration on the manganese removal were investigated. The results indicated that the removal rate of manganese exceeded 99.9% and the Mn (II) ions concentration of treated wastewater was lower than 0.1 mg·L-1under the conditions of reaction temperature 55 °C, concentration of H2O20.1 mL·L-1, reaction time 70 min, concentration of CaO 0.25 g·L-1.
Separation of Methyl Propionate-Methanol-Water by Salting-Out Extraction
Authors: Cao Yu Feng , Fan Dong Li
Published: January 2014

In order to reduce the energy consumption for the separation of methyl propionate-methanol-water system, the application of salting-out extraction was studied. The main functional mechanism of salting-out extraction was that the salt ions form complex with the methanol molecules and intermolecular hydrogen bonds were formed between the moleculed of inorganic salts and water. The results of gas chromatography showed that adding salts can significantly decrease the mutual solubility of the components in the system mentioned above. The results showed that the optimum operation parameters were as follows: the saturated MgCl2 was selected as the best solvent, solvent ratio (VF/VS) was 1：2.5, extraction temperature was 20 °C, stirring rate was 300r/min, stirring time was 20min, and settling time was 20min. Under the optimized parameters, the mass fraction of methyl propionate exceeded 99.33% and the yield was 90.19% through the three-stage of cross-current extraction.
Study on Volatile Evolution during the Eucalyptus Pyrolysis by Using TG-FTIR Analysis
Authors: Fu Dian Zheng , Tang Ye , Fu Zheng Hui , Zhang Hong Liang , Li Wei
Published: January 2014

In this study, thermogravimetric analysis coupled with Fourier transform infrared analysis (TG-FTIR) was used to studying the volatile evolution characteristic during the eucalyptus pyrolysis from South China. The thermogravimetric analysis results indicate that the pyrolysis of eucalyptus occurred in three main stages which are the moisture vaporization stage, the volatile matter release stage and the char decomposition stage. The major gases evolved during the pyrolysis process were identified to be H2O, CO, CO2, CH4. In addition, the effects of different heating rates on the emissions of these pyrolysis products have been studied.
Adsorption Breakthrough Curves for Alkaline-Earth Metal Ions on the Resins in a Fixed-Bed Column
Authors: Liu Hai Ning , Zhang Hui Fang , Gao Can , Ye Xiu Shen , Wu Zhi Jian
Published: January 2014

A column sorption study was carried out by using four resins (D113, D001, LS-1000, LS-5000) for the adsorption of alkaline-earth metal ions from aqueous solutions. The breakthrough curve was obtained as a function of feed flow rate, and the total and breakthrough capacity values of the resins were calculated. Four kinetic models: Adams-Bohart, Wolborska and Thomas models were applied to experimental data to predict the breakthrough curves of Na-form resins and to determine the characteristic parameters of the column useful for process design. All models were found suitable for describing the whole or a definite part of the dynamic behavior of the column with respect to flow rate and inlet ion concentration. The results obtained would be helpful for the understanding of the competitive adsorption processes and the recovery or removal of one or more alkaline-earth metal ions from aqueous solutions.
The Present Situation and Future Trend of the Applications of TiO2 in the Wastewater Treatment
Authors: Wang Bing , Tong Shou Hui , Han Song , Xiao Yi , Wei Xing , Guo Ping Wu , Zheng Yi , Xu Wei Jian , Wang Huan Shu
Published: January 2014

With the improvement of industrial technology level there are more and more special water quality in the waste water, this bring great difficulties to the water treatment, and the water environment has been an unprecedented severe challenges , especially in some industrial cities. This not only endanger the safety of nearby residents drinking water, even threatening the whole ecological environment. There are some people proposed TiO2 photocatalysis oxidation technology in wastewater treatment may play an important role, so it has been a hot issue in the field of science and technology research.
Adsorption of 4-Chloro-2,5-Dimethoxy Nitrobenzene by Activated Pyrolytic Char from Pine Sawdust
Authors: Xiao Wei , Zhang Ran Di , Song Yu Bing , Han Run Ping , Li Yan Qiang
Published: January 2014

The adsorption studies of 4-chloro-2,5-dimethoxy nitrobenzene (CDNB) from aqueous solution on pyrolytic char activated by ammonium dihydrogen phosphate from pine sawdust have been performed. Several experimental parameters like initial pH, NaCl concentration, contact time solution temperature were evaluated. Solution pH within 2-7 is favor of adsorption and it is advantage of adsorption at higher temperature. Langmuir, Freundlich and Temkin isotherm models were used to fit the experimental data and Temkin model was better. The adsorption capacity was up to 33.8 mg·g1at 323 K. The process is spontaneous and endothermic and physical action is major mechanism.
Adsorption of Neutral Red by Pyrolytic Char from Pine Sawdust
Authors: Shang Yu , Zhang Jing Hua , Li Yi Ke , Han Run Ping
Published: January 2014

Pyrolytic-char, a by-product from the slow pyrolysis of pine sawdust, was characterized by FTIR, SEM and XRD, etc. Then it was used as an adsorbent for the removal of cationic dye, neutral red (NR) from solution in batch mode. Adsorption studies were performed at different pH, salt concentration, contact time and dye concentration in the batch mode. Solution pH 6 is favor of adsorption and it is disadvantage of adsorption with common salt existed. Langmuir and Freundlich isotherm models were used to fit the experimental data and Freundlich was better. The adsorption quantity from experiment was up to 272 mg g1at 293 K. PR can effectively adsorb cationic dye from solution.
Effects of Different Zeolite Cluster Model on the Simulation of Benzene Adsorption by ONIOM3 Method
Authors: Sun Xiao Yan , Qiao Dan , Qiang Long , Xiang Shu Guang
Published: January 2014

The influence of different cluster model structures to adsorption of benzene have been investigated by three H-ZSM-5 zeolite cluster models of different structures. The size of three cluster models are 15T, 33T and 36T. The ONIOM adsorption energies of benzene on the three H-ZSM-5 zeolite are-8.48 kcal/mol, -26 kcal/mol and-20.15 kcal/mol, respectively. The results derived in this study show that, zeolite cluster model is more bigger, the adsorption energies of benzene can be greater. These are because the small cluster model ignores the van der Waals interaction framework structure of zeolite. The difference between 33T and 36T cluster model calculations indicate that different quantum clusters of the same size can infulence the simulation results in some degree. In order to reflect the van der Waals interaction of zeolite micropore structure, the zeolite cluter model should include the cage structures like 33T model on simulation process of adsorption.
Natural Dye from Garcinia dulcis (Roxb.) Kurz Bark and Application on Silk Fabric by Using Pad-Batch Dyeing: A Study on Mordant Concentrations Efficiency
Authors: Mongkholrattanasit Rattanaphol , Rungruangkitkrai Nattadon , Tubtimthai Nitaya , Sasivatchutikool Nuttanan , Punrattanasin Nattaya
Published: January 2014

The dyeing and fastness properties of silk fabric dyed with natural dye extraction from the bark of Garcinia Dulcis (Roxb.) Kurz by the pad-batch process was studied. The effect of dyes at different mordant concentration levels on their colour strength was also investigated. Silk fabrics dyed with Garcinia Dulcis (Roxb.) Kurz bark extract showed a pale yellow shade, while those dyed with alum and stannous chloride bright yellow and light yellow colour, respectively. Silk substrates dyed with CuSO4 gave a yellowish green colour, while those dyed with FeSO4 had a dark brown colour. The fastness properties showed fair to good rating, whereas the colour fastness to perspiration was at a poor level.
Preparation of a New Type Cleanup Additive
Authors: Wang Zeng Lin , Gao Jian Bo , Fan Hai Ming , Li Bing Cheng , Zhang Hong Tao
Published: January 2014

Nonionic surface active agent AO-1, n-butanol, kerosene and water were mixed in varying proportions to compound micro-emulsion. According to different phase states of each micro-emulsion, some systems with representative were picked up, and then tested the interface properties of oil phase of the systems above. The experimental results show that there is a system with low interfacial tension and steady surface tension.
Synthesis and Characterization of Luminescence Eu3+/Polyurethane Composite Material
Authors: Sheng Kai , Wang Jie Lin , Li Ying , Wang Yi Han , Xu Meng Xue , Liu An Jin
Published: January 2014

Selecting lactam 2,6-pyridinedicarboxamide (PDCA) as the ligand and 1,4-butanediol as chain extender, we prepare polyurea polyurethane PDCA-PU; then, introduction of rare earth ion Eu3+ and small molecule ligands 1,10-phenanthroline (phen), synthesized binary and ternary polyurethane composite containing Eu3+, and comparing the fluorescence properties of the material. We investigated the thermal stability and luminescence properties of hybrids and found that the ternary hybrid materials exhibit better thermal stability and stronger emission intensity.
Application Study of Viscoelastic Damping Material for the Anti-Galloping of Overhead Transmission Lines
Authors: Sun Na , Zhu Kuan Jun , Liu Bin , Liu Sheng Chun , Liu Liang
Published: January 2014

Based on the galloping mechanism of transmission line, it is determined to use viscoelastic damping material and energy effects of TMD to suppress galloping. The dynamic mechanical properties of viscoelastic damping material is studied, with the operating environment of the transmission lines, high-and-low-temperature physics experiment is carried out, while the experimental study on mechanical properties is carried out with the developed viscoelastic damping elements. It is showed that the viscoelastic material meets the anti-galloping device performance requirements for materials, it has a good energy consumption effect, suitable for application to anti-galloping of transmission lines.
Fabrication of Nanostructured Ni Film with Superhydrophobic Property
Authors: Liao Jin Yun , Li Hao , Zhang Xi Bin
Published: January 2014

Superhydrophobic film materials have recieved intensive attention owing to their wide applications in different areas. In the present study, nanostructured Ni film has been successfully fabricated with the assistance of an external magnetic field. X-ray diffraction analysis demonstrates that the as-prepared Ni film is presented in face-centered cubic phase and elmentary analysis indicates the as-prepared Ni film is pure Ni. It is found that ethanol in the reaction solution plays a key role in determing the morpholgy of the final products and ethanol is unfavourable for the formation of Ni film. The static contact angles of water on the as-prepared Ni film can reach ca. 146 o, implying that the film exhibits superhydrophobic property.
Chiral Recognition of L-Carnitine Using Surface Molecularly Imprinted Microspheres via RAFT Polymerization
Authors: Hou Lin Tong , Chen Jiao Jiao , Fu Hong Jun , Fu Xin Lei
Published: January 2014

A molecularly imprinted microsphere (MIPs) was prepared successfullyviasurface-initiated reversible addition-fragmentation chain transfer (RAFT) polymerization. Characterization of the obtained MIPs was achieved by FT-IR and TGA. The isothermal adsorption and chiral separation experiments of MIPs on L-Carnitine were investigated. Compared with non-imprinted microsphere (NMIPs) adsorbent, MIPs showed faster adsorption rate and stronger adsorption capacity for L-Carnitine. Equilibrium experimental data of MIPs fitted the Langmuir isotherm better. Furthermore, the MIPs also exhibited enantioselectivity for L-Carnitine through the resolution experiment.
The Effect of Acrylonitrile Content on the Abrasion Behavior of Unfilled Nitrile Rubber
Authors: Cao Zhi Qiang , Wang De Guo , Zhou Qiong
Published: January 2014

Three unfilled nitrile rubber vulcanizates with different acrylonitrile contents (28%, 33%, and 40%) were prepared. The gravimetric wear rate of testing samples increased with increasing acrylonitrile contents. The cross-linking densities of rubbers were studied by the equilibrium swelling method. The measurement of the dissipated energy between tip and rubber surface was also carried out using tapping mode atomic force microscopy and the results suggest that the cross-linking density in local areas is primary responsible to the abrasion performance of unfilled nitrile rubber with reference to the polarity of polymeric matrix.
The Influence Factors of Silicon Steel Magnetic Property
Authors: Shang Lei , Yang Hai Li , Xu Hong , Li Yun Gang
Published: January 2014

Magnetic properties of silicon steel mainly depend on the internal organizational structure and chemical composition. The main factors affecting magnetic properties of silicon steel are analyzed and summarized, including grain size, inclusions (size, type, quantity, and morphology), crystal texture, internal stress, dimensional accuracy, the surface quality of steels, and chemical composition. The impact mechanism of the factors influencing silicon steel magnetic property is explained and these influence factors are interrelated.
Research of Complex PZT Film Base on Shear Mode Energy Harvesting
Authors: Chen Xiao Jie , Qiu Cheng Jun , Liu Hong Mei , Dou Yan Wei , Cao Shan Shan
Published: January 2014

The preparation of complex PZT with high d31 piezoelectric performance, which is used to the energy harvesting cantilever in vibration mode, is discussed in this paper. The Si/SiO2/Cr/Au/PT/PZT/PT structure base on (100) silicon crystallographic is growth through a PT transition layer before coating Sol-gel PZT film, which is in favor of the PZT film polarization processing in d31 shear mode. It is shown that the PZT film present the perovskite phase after optimize annealing at 700°C by XRD analysis. Piezoelectric properties test indicated that the PZT film has the coercive field at 23kV/cm and the remnant polarization is 60μC/cm2. The silicon-based cantilever with complex PZT film fabricated by MEMS technology is also given in the paper.
The Optimization Research on Hollow-Core Photonic BandgapFiber CoreTransversal Radius
Authors: Xu Ding Jie , Song Hong Ru , Wang Wei , Fan Yue
Published: January 2014

In hollow-core optical fibers, surface mode is one most important reasons causes fiber loss. In order to suppress surface mode loss, simulations of the designed hollow-core optical fibers have been made numerically using full vector finite element method, and the light intensity distributions are in the different core transversal radius is obtained. Analysis results show that both the enlargement of core radius and using fusing transversal method lead into the core holeare more helpful to suppress surface mode loss. This conclusion may provide a basis for small duty cycle (f< 85%) hollow-core optical fibers fabrication the theoretically. Keywords:hollow-corephotonic band-gap fiber (HC-PBF),finite element method (FEM), surface mode loss, core transversal radius, core intersected method
Velocity Profile of Viscous-Elastic Fluid in Eccentric Annulus with the Internal Rod Moving Axially
Authors: Liu Li Li , Hao Wei Dong , Yang Shu Ren , Wang Li Hui , Xu Di
Published: January 2014

Using lower-convected Maxwell constitutive model, the control equation of the steady flow of viscous-elastic fluid in the eccentric annulus with inner rod moving axially in the bipolar coordinates system is established, and discreted by control-volume method, the velocity profile is solved by ADI methods, which lays theory basis for further analyzing the stress field and the reason of pumping rod eccentric wear. The result shows: eccentric ratio is the most important factor to the velocity profile.
Bioinformatic Analysis of Codon Usage Bias in the ompC Gene of Salmonella pullorum
Authors: Bao Xiao Yu , Xu Guo Yang , Fan Lei , Liu Ming Gang , Zhou Yao , Pan Kang Cheng
Published: January 2014

The aim was to identify codon usage bias between the newly comfirmed Salmonella pullorum outer membrane protein C (ompC) gene (GenBank accession No. CP003047) and that of other 21 reference Enterobacteriaceae ,and we performed comparative analysis of the codon usage bias among different organisms by a series of bioinformatics softwares The apparent codon usage bias in the 22 ompC were indicated by the codon adaptation index (CAI), effective number of codons (ENc) and the value of G+C content at the 3rd codon position ( GC3s).The Enc-plot revealed that these outer membrane protein C genes are subject to GC compositional constraints.The correlation analysis with other four organisms implied that codon usage pattern of E.coli is similar to Salmonella pullorum OmpC .
Determination of Content of the Four Alkaloids and the Total Alkaloid in Co-Dergocrine Mesyiate Tablets by HPLC
Authors: Yue Hong Kun , Chang Ming , Liu Si Jie , Zhou Ran
Published: January 2014

Objective: To determine the four kinds of alkaloid and the total alkaloid in Co-dergocrine Mesyiate tablets by HPLC. Methods: HPLC was used. C18column (250mm×4.6mm5μm) was selected, the mobile phase was acetonitrile-H2O-triethylamine (50:150:5).Detection was performed by UV with wavelength of 280nm.Results:A linearity of alkaloid I was obtained from 240.336 to 961.344μg/mL with good correlation (r=0.9997). The average recovery of alkaloid Iwas 101.16%, and RSD was0.92%. A linearity of alkaloidII(α isomer) was obtained from 240.336 to 961.344μg/mL with good correlation (r=0.9998). The average recovery of α-alkaloidII was 99.31%, and RSD was1.14%. A linearity of alkaloidII(β isomer) was obtained from 240.336 to 961.344μg/mL with good correlation (r=0.9999). The average recovery of β-alkaloidII was 97.31%, and RSD was1.96%. A linearity of alkaloid IIIwas obtained from 240.336 to 961.344μg/mL with good correlation (r=0.9998).The average recovery of alkaloidIII was 102.02%, and RSD was 1.38%.Conclusion:The HPLC is sensitive and accurate in determining the four kinds of alkaloid in Co-dergocrine Mesyiate tablets. It can be applied efficiently.
Research on Attention EEG Based on Jensen-Shannon Divergence
Authors: Zhang Zheng Xia , Xu Si Qiu , Zhou Er Ning , Huang Xiao Lin , Wang Jun
Published: January 2014

The article adopted the Jensen - Shannon Divergence analysis method for alpha wave EEG complexity analysis, used to quantify the three different status (Eyes closed, count, idle) degree of coupling between acquisition of EEG time series. The algorithm are used to calculate the statistical complexity of alpha wave EEG signals then T test, the results show that the state of eyes closed and idle under the coupling degree between EEG time series, and the state of eyes closed and counting, counting and daze cases EEG time series have significant differences. Thus JSD algorithm can be used to analyze EEG signals attention, statistical complexity can be used as a measure of brain function parameters and would be applied to the auxiliary clinical brain function evaluation in the future.
Structure-Based Virtual Screening of Compound Library for Anti-Estrogen Breast Cancer Candidates
Authors: Li Xiao Yan , Liu Xue , Du Chao Feng , Luo Hua Jun , Deng Wei Qiao , Huang Nian Yu
Published: January 2014

We reported a structure-based virtual screening of acompound library derived from 3-acyl-5-hydroxybenzofurans to develop potentialdrugs for treating breast cancer. A library of 160,000 compounds was generatedand screened based on the G-score between ligands and receptor ERα. The topstructures were further analyzed to evaluate the receptor-ligand bindinginteractions. By comparing the binding characteristics and docking scoringvalues to the existing ERα analogues, we determined top 200 compounds aspotential drug candidates for breast cancer.
Study on Hydrolysis Conditions of Lactobacillus bulgaricus on Casein Sodium by Method of Response Surface and the Antioxidant Activity of Hydrolysates
Authors: Liu Zhen Yan , Yang Wen Qin , Liu Han , Zhang Jie , Zang Chuan Gang , Liu Yu Chao , Guan Hong
Published: January 2014

In order to study the ability ofLactobacillus bulgaricushydrolyzed protein, using casein sodium as substrate, the content of free amino acid and relative ORAC value were used as the index optimization. The conditions including: hydrolysis temperature, cultivation time,Lactobacillus bulgaricusdosage and pH values were investigated by single-factor experiment. In this paper we studied the hydrolysis conditions ofLactobacillus bulgaricuson casein sodium by the Box-Behnken response surface and the optimal hydrolysis temperature, cultivation time,Lactobacillus bulgaricusdosage and pH value were determined to be 43 °C, 36 h, 25 OD/ml, and pH 6.6, respectively. The optimum value of response surface is 857.75 mg/l. In addition, the analysis of relative ORAC value of response surface showed that there is no direct relationship between the degree of protein hydrolysis and radical scavenging activity, namely as extensive hydrolysis could have a negative impact on the antioxidant activity.
Effect of Hydrolyzed Polyacrylamide Used in Oil Recovery on Characters of Crude Oil
Authors: Hou Chun Juan , Jiang Qing Zhe , Song Zhao Zheng , Tan Guo Rong , Zheng Shuai , Li Shao Hua
Published: January 2014

The major objectives of this study are to experimentally investigate the influences of hydrolyzed polyacrylamide (HPAM) used in oil recovery on characters of crude oil. The HPAM is SNF 3640D from SNF Floerger in French. The experiments were putting HPAM with different concentrations into crude oil, and analyzing the basal characters of crude oil. Settling experimental results showed that the content of resin and asphaltene were decrease with the increase of HPAM concentrations. The viscosity of crude oil had relation to HPAM concentrations, when the concentration of HPAM reaching 700 mg/l, the viscosity would increase about 15 percent. The forms of HPAM were observed by environment scanning electron microscope (ESEM) also changed, at first the HPAM gathered into mass, in the end the HPAM was taken off with produced water presented longer linear.
Use New PDLLA/PRGD Nerve Conduits for Promoting Peripheral Nerve Regeneration
Authors: Qiu Tong
Published: January 2014

Nerve conduits provide a promising strategy for peripheral nerve injury repair. Additional factors in nerve conduits such as cell adhesion molecules help to provide a more conducive microenvironment for nerve regeneration. In the present study, poly lactic acid (PDLLA) was modified by grafting Gly-Arg-Gly-Asp-Gly (RGD peptide) for fabricating new PDLLA/PRGD nerve conduits to promote nerve regeneration and functional recovery. Invivo, RGD addition improve the recovery efficiency of the transected nerve, that is, the sciatic function index (SFI) value of the PDLLA/PRGD group was significantly higher than those of group PDLLA. The regenerated nerves in PDLLA/PRGD group were more mature with significant elevations in both the cytoskeletal proteins expressions and the nerve growth factors expressions. Taken together, RGD peptide is one of the good candidates to enhance the biocompatibility of the biomaterials and facilitate the peripheral nerve regeneration.
Using 2D-PAGE and Mass Spectrometry (LC-MS/MS) for Embryo Proteins Analysis in Antheraea pernyi
Authors: Wang Yong , Jiang Yi Ren , Qin Li
Published: January 2014

To study the dynamic variation of protein components and contents inAntheraea pernyi, 2D-PAGE, in this job, was used to investigate embryo development. Some special protein spots expression profiles changed obviously were analyzed by mass spectrometry. 2D-PAGE results showed that the protein spots increased from 370 at the development stage of 12 h to 422 at 300 h. Eighteen special protein spots were identified byLC-MS/MS, and 8 kinds of proteins are found to include heat shock proteins families, Vitellogenin, KK-42-binding protein, actin-depolymerizing factor 1, etc., which are mainly involved in some important processes. Analyze the function of those proteins, so as to accumulate basic information on embryonic development inA. pernyi.
Comparison of Chemical Properties and Ni Release of Stainless Steel and Nickel Titanium Wires
Authors: Wichai Wassana , Anuwongnukroh Niwat , Dechkunakorn Surachai
Published: January 2014

Objective: This study aimed to determine the composition and corrosion resistance of stainless steel and nickel titanium (NiTi) archwires and to compare Ni released from simulated standard fixed orthodontic appliances ligated with stainless steel and NiTi wires in artificial saliva at pH 5.14 and pH 6.69. in 4 weeks at 37oC.
Materials and Method: Two commercial rectangular wires, 0.016 x 0.022 in size were studied, one Ormco stainless steel wire and another Ormco nickel titanium wire. Their composition was analyzed by an energy disporsive X-ray spectrometer (ESC) and their corrosion resistance was evaluated by a potentiodynamic polarization technique. For Ni release, the twenty-eight simulated fixed appliance sample sets were used, each corresponding to one half-maxillary arch. The samples were divided in 2 groups (14 sets per group). The first one was ligated to Ormco stainless steel archwires and the other one to Ormco NiTi archwires with elastomeric ligatures. Half sets of each group were immersed in 50 ml artificial saliva at pH 5.14 and the other half were immersed at pH 6.69. Ni release was quantified using flame atomic absorption spectrophotometry. Statistical analysis of variance (t-test) was determined on days 1, 4, 7, 9, 14, 21 and 28 comparing the amount of Ni released between groups.
Results: Stainless steel wire was composed of Ni, Cr, Si, Mn and Fe while the nickel titanium wire was composed of Ti, Ni and Cr. NiTi wire has more percentage of Ni and therefore has less corrosion resistance than stainless steel wire. For Ni release, stainless steel and NiTi continuously increased at the time intervals for both pH levels. For group one, stainless steel wire had more Ni release at pH 5.14 and for the other group, NiTi wire had more Ni-release at pH 6.69. At 4 weeks, the Ni release of one half-maxillary arch was 1.383 ppm (1383 μg/l) at pH 5.14 and 1.079 ppm (1078 μg/l) at pH 6.69 for stainless steel wire while it was 1.221 ppm (1221 μg/l) at pH 5.14 and 1.267 ppm (1267μg/l) at pH 6.69 for NiTi wire. No significant difference was found in the amount of Ni release from stainless steel and NiTi wires at pH 5.14 and pH 6.69 in the different time intervals except on day 1 wherein the stainless steel archwire was significantly different (p<0.05) at pH 5.14 and pH 6.69.
Conclusions: The NiTi wire had more Ni contain and less corrosion resistance than stainless steel wire. Stainless steel had more Ni release at pH 5.14 than pH 6.69 but NiTi had greater Ni release at pH 6.69 than pH 5.14.
Fast Testing Methods on the Performance of Laser Confocal Micro-Raman Spectroscopy System for Cell Analysis
Authors: Meng Xiao Chen , Zhu Lian Qing
Published: January 2014

To provide the quality assurance for various samples test, fast testing methods of the performance of laser confocal micro-Raman spectroscopy system for cell analysis are developed. The silicon wafer was used on the performance test of LabRam INV system produced by Horiba JY. The silicon wafer can not only be used for system calibration (the band of 520.7cm-1), but also for the evaluation of the system performance. The curves of the intensity at the band of 520.7 cm-1 as a function of laser intensity radiated on the sample, pinhole and time were achieved. The results show that the intensity at the band of 520.7 cm-1 change linearly with the laser intensity, which can be used to evaluate the laser intensity radiated on the sample. The intensity changes with pinhole can be used to determine the size of pinhole for different purpose. The stability of Raman system can be determined by the variation of the intensity at the band of 520.7 cm-1 with time, which helps to decide whether it is suitable for other sample test.