bluuebunny/crossref_metadata_2025 huggingface dataset:
Preparation and Characterization of Mesoporous Carbon Materials Based on Hard Coal-Tar Pitch
Authors: Xu Gui Ying , Bai Jin Feng , Zhang Jian , Zhang Li Hua , Ni Rui , Dai Wei
Published: August 2013

Mesoporous carbons were prepared by one step method using hard coal pitch as carbon source, in which magnesium oxide was adopted as template. The adsorption value of vitamin B12, specific surface and pore size distribution, surface topography of mesoporous carbons were tested by spectrophotometer, specific surface analyzer and scanning electron microscopy. The results showed that the vitamin B12 absorption value on mesoporous carbon could be improved with suitable carbonization temperature and mass ratio of template agent to carbon source. The maximum value achieved to 103.82mg/g when the mass ratio of MgO to modified pitch was 8:2.
A New Green Process for Synthesising High Quality PLLA Materials
Authors: Shao Hui Li , Zhou Xian Jue , Hu Xue Chao
Published: August 2013

Synthesis of Poly(L-lactide) (PLLA) by the ring-opening polymerization (ROP) of L-lactides in supercritical carbon dioxide (SC-CO2) with co-solvent were studied. Effects of kinds of co-solvent on the molecular weight (MW) and the molecular weight distribution (MWD) of the resultant polymers were investigated by the gel permeation chromatography (GPC). The resultant polymers were also characterized with 1H NMR, 13C NMR and FT-IR. It was found that PLLA with high purity and almost without racemization could be obtained by this technology and the acetone is the best co-solvent for this kind of polymerization. By using stannous octoate as initiator and acetone as co-solvent, PLLA having a weight-average molecular weight (Mw) near to 9×104 and polydispersity index (PDI) of 1.7 was successfully synthesized.
The Application of Modified Nanometer Titanium Dioxide in Degradation of Methyl Orange Solution
Authors: Shu Xin Qian , Shan Zhi Qiang
Published: August 2013

The nanometer TiO2 thin membrane on different substrates doped with La3+ was prepared from Ti (OC4H9)4 and La (NO3)3 by Sol-Gel processing using dipping technique. The photocatalytic activity of membrane at different doping concentration in photocatalytic methyl orange was studied. The result showed that both the degraded rate and the optimum concentration depended on the change of doping concentration and substrates. When TiO2 thin membrane was doped with 0.5 La3+ on the substrates of glazed ceramic, aluminum and stainless steel, TiO2 membrane has the maximum degradation rate.
Synthesis and Identification of Heavy Metal Lead Artificial Antigen
Authors: Ye Hai Qing , Liu Jing Bo , Wei Jun Xiao , Xu Meng Lei , Li Yan Song
Published: August 2013

Lead ions were coupled to protein carrier bovine serum albumin (BSA) and keyhole limpet hemocyanin (KLH) respectively. Diethylene Triamine Pentacetate Acid (DTPA) was used as bifunctional chelator. Pb-DTPA-Carrier protein, DTPA-Carrier protein and carrier protein were detected qualitatively with ICP-MS, UV spectrophotometer and electrophoresis. It turns out that the Pb-DTPA-Carrier protein contains certain concentration of heavy metal ion, the maximum ultraviolet absorption peak value of Pb-DTPA-Carrier protein significantly higher than that of DTPA-Carrier protein and carrier protein, and the electrophoresis reveals more vague bands of Pb-DTPA-Carrier protein with slower migrations speed comparing to the bands of the DTPA-Carrier protein and carrier protein. The result indicated that the artiﬁcial antigen for lead was successfully synthesized.
Removal of Methyl Red from Aqueous Solution by Adsorption onto Mg-Al HTLc
Authors: Zang Yun Bo
Published: August 2013

In this study, removal of Methyl Red from aqueous solutions by synthetic Mg-Al-HTlc was investigated as a function of contact time, pH and temperature. It is found that HTlc could reduced Methyl Red concentration effectively. The kinetic process which reached equilibrium at about 2h can be fitted by pseudo-second order kinetics. The percent removal of MR by the HTlc was dependent on the initial pH of bulk solution. There was no much changes in amount of adsorption in the initial pH range of 6-8, while it reached maxium at about of 9. The adsorption process was endothermic.
Feasibility Study on Coking Waste Water Treatment by Three-Dimensional Electrode
Authors: Jia Ya Nan , Jiang Wu Feng , Hao Su Ju , Zhang Yu Zhu , Zhang Lei
Published: August 2013

The feasibility of coking waste water treatment by three-dimensional electrode was studied in the experiment. The reactor is comprised of a conventional two-dimensional electrode filled with high carbon-bearing metallized pellets which is also called the third electrode. The results show that there is a dramatic decrease in the content of COD, phenol and cyanide by this treatment. Also the color of coking wastewater after being treated is compared with original sample.
Effect of Camptothecin on the Embryonic Development and Angiogenesis of Zebrafish Embryos
Authors: Song Chun Xia , Song Shu Liang , Liang Hao , Liu Xu
Published: August 2013

Camptothecin (camptothecin, CPT) is a kind of anti-cancer drugs targeted at DNA topoisomerase with strong toxicity and side effects. The zebrafish is a model organism to study the anti-tumor drugs. The CPT was added into culture system in early development period of zebrafish embryos, and staining techniques were used to study embryonic development and angiogenesis in zebrafish. Results showed that low concentration of CPT can affect embryonic development seriously, and trigger the developmental delay which might led to teratism or death and accompanied with apoptosis phenomenon at the same time. Besides, CPT can also inhibit the development of intestinal vein in zebrafish embryos, which provided the experimental basis for the research of the pharmacological analysis, screening and evaluation model of topoisomerase I inhibitor class drugs.
Parameter Optimization of Biodegradable Polymer Materials Degradation Model Based on ACO Algorithm
Authors: Zhang Ying , Zhang Yu Huan , Zhang Hao
Published: August 2013

To improve the simulation accuracy of biodegradable polymer materials degradation model, a parameter optimization model was proposed, and the ant colony optimization algorithm (ACO) was used to solve the model and optimize undetermined parameters of the model. A comparative analysis of the calculation results was progressed which proved that the simulation accuracy of biodegradable polymer materials degradation of model can be significantly improved by using the optimized parameters. This parameter optimization is propitious to demonstrate the science meaning of degradation mechanization and guide the design and product of medical devices.
Preparation of Laponite-Armored Polystyrene Particles by Pickering Emulsion Polymerization
Authors: Yang Ying , Wu Da Yong , Jiang Shi Dong
Published: August 2013

Laponite-armored polystyrene (PS) particles were fabricated by Pickering emulsion polymerization. Emulsions of styrene dispersed in water were stabilized by hydrophobic modified Laponite nanodiscs. The properties of PS particles were investigated by TEM, SEM and DLS. The results show that these particles have narrow size distribution with diameter around 160 nm, which attributes to the improvable wettibility of modified Laponite stabilizer. TEM result proves that Laponite nanodiscs are on the surface of PS particles.
Study on Purification of Tea Saponin by Foam Separation Method
Authors: He Jun , Cao Li Fen , Yao Qing Qing , Xu Peng Fei , Yu Ning , Zhou Yang , Zhao Feng , Hu Zhi Wen , Peng Zhi Qin
Published: August 2013

Foam separation method was utilized to purify crude tea saponin. The factors influencing the purification were studied, including the effects of original concentration, airflow rate and loading liquid volume. By systematic experiments, the optimal purification technology was determined. Foam separation method showed great advantages such as: low solvent and energy consumption, convenience, environmental friendliness. This work provides useful information for tea saponin purification development.
Study on Preparation and Properties of High Permeability Polyurethane Composites with Low Swelling
Authors: Wang Lin , Liu Fang , Cao Si Tong
Published: August 2013

The water vapor permeability and water-swelling property of Polyurethane (PU) membranes with hydrophilic group and the PU composites were investigated. The water vapor permeability of the PU membranes increases with increasing polyethylene glycol (PEG) content. The highest water vapor permeability of PU membrane reaches 5,500 g/m2×24h, whose expansion ratio reaches fifty-eight percent. The PU composites have three PU layers. The best surface layer of the composite is PU with fifteen percent PEG content, and the best base layer is PU with one hundred percent PEG content. The middle layer uses PU with PEG content from fifty to one hundred percent. The water vapor permeability of the PU composites can reach 4,000 g/m2×24h, and the water-expansion ratio of the composites is below four percent when the surface layer of the composites contacts with water.
Mechanical Properties of Carbon/PEEK Composites According to the Fiber Ply Orientation and Sizing Removal of Carbon Fiber for Artificial Hip Joint
Authors: Kim Yun Hae , Yoon Sung Won , Lee Jin Woo , Kim Tae Hyun , Jung Min Kyo , Moon Kyung Man , Choi Hyeung Sik , Murakami Ri Ichi
Published: August 2013

The purpose of this study is to determine the correct estimation of the mechanical property between epoxy resin and PEEK sheet as the composites and its validity has been tested with the alternative materials of the metal-based materials for artificial hip joint. Moreover, this work evaluated the mechanical properties according to the temperature of heat treatments for sizing removal of carbon fiber and the fractured surfaces of Carbon/Epoxy and Carbon/PEEK composites were also evaluated. First, the sizing removal of carbon fiber were conducted at 300°C for 4 hours and 400°C for 2 hours. The fractured surface in the specimen of tensile test made from PEEK and epoxy resin was observed by SEM. the fracture surface of the tensile test specimen of the Carbon/Epoxy composites heat-treated to 400°C showed that the resin did not bury nearly in the fiber surface and pull out was observed. It is shown that 400°C is suitable for the sizing removal of the carbon fiber. The mechanical test result showed that there was no significant differences in short beam strength. However, the tensile strength and compressive strength of the Carbon/PEEK composites was higher than those of the Carbon/Epoxy composites in the case of the Vacuum Bag process. In addition, this result showed that the sizing material did not have a significant effect on the strength of the Carbon/PEEK composites.
Cu Ion Release and Cell Damage Effect of Cu-Containing IUDs with Different Surface Areas of Copper
Authors: Zhang Xiao Meng , Ding Ting Ting , Sun Jiao
Published: August 2013

The aim of the present study is to evaluate the cupric ion releases and cytotoxicity of Cu-bearing intrauterine device (IUD) with different surface areas. TCu380, GCu300 and MCu165 were selected and extracted with MEM for 24h. Inductively Coupled Plasma Mass Spectrometry (ICP-MS) was employed to determine the concentration of Cu ions. MTT assay was conducted to evaluate the cell viability of original and diluted extracts. Oxidative stress indicators such as superoxide dismutase (SOD) and lipid peroxidation (MDA) were measured. The results showed the concentration of Cu ions released from three kinds of IUDs were 114.836mg/L, 91.161mg/L and 85.750mg/L, respectively. Cell viability of all original IUDs extracts was around 10%. TCu380 showed more significant cytotoxicity and higher oxidative stress level than other two IUDs when extracts were diluted. The study suggested that there was a positive correlation between the quantity of released Cu ions and cell damage effect in Cu-IUDs. The mechanism of cytotoxicity might be elevation of oxidative stress.
Modelling of a Monolithic Solid Oxide Fuel Cell
Authors: Williams G.J. , Chen Y. K. , Bhinde F.S.
Published: August 2013

The paper presents a bespoke mathematical model that simulates the electrochemical, thermal and fluid-dynamic interactions in a solid oxide fuel cell. This model is created for the purpose of evaluating and optimising a novel SOFC architecture. The proprietary fuel cell design consists of cathode supported cross-flow monolithic flow channels of hexagonal honeycomb section. The monolithic cells are constructed from porous cathodic material, with porous anodic and dense electrolytic material deposited inside specific hexagons such that any anodic cell is surrounded by six cathodic cells. Current collection is achieved by bus-plating on the monolith perpendicular to the direction of flow, and using thin interconnects attached to a corner of an anodic cell. The mathematical model considers a single side of the hexagon to simulate electrochemical interactions combined with heat and mass transfer. The finite difference technique is applied to predict numerically from a given current value voltage potential, temperature, fuel and oxidant compositions and partial pressures at the electrolyte/electrode interfaces. The model can be treated as a small segment of any geometry, thus can be, with added complexities of non-uniformity in surface thickness, extended to other shapes, and therefore used as an aid at the design stage to choose the values of geometric variables such as electrode and electrolyte thickness, etc.
Study on a Novel Prerefining Catalyst for Hydrocracking Process
Authors: Tian Ran , Wang Fu Cun , Liu Wen Yong , Li Xiao Gang
Published: August 2013

The effect of different promoters and the content of promoters on the hydrorefining catalyst for hydrocracking process were studied. The results showed that specific promoter can effectively change the properties of carriers, which resulted in the catalysts have large surface area, high activity,and suitable acidity. When the content of promoter was three percent, the catalyst had the best performance. The evaluation results revealed the reaction temperature of developped catalyst was lower 6°C than that of the reference catalyst on the condition of obtaining the same products.
Moisture Deterioration Mechanism of Fiber Reinforced Composites
Authors: Kim Yun Hae , Park Jun Mu , Lee Jin Woo , Jeong Jae Hyun , Moon Kyung Man
Published: August 2013

Generally, the moisture absorbed in the composites plasticizes the resin. And it makes the composites expansion in volume and generates the cracking at the same time, So, the fracture is often generated in the composites by those reason. Therefore, in this study, the change of mechanical properties due to the moisture-absorption for the carbon fiber reinforced composites in comparison with basalt fiber and glass fiber reinforced composites are investigated. The specimens for the carbon, basalt, and glass fiber reinforced composites manufactured with the ASTM standard. The specimens immersed in distilled water at 80°C during 100 days and the coefficient of moisture was measured in according to the Fick's law. In addition, after drying process, the humidity-absorbed specimen under 80°C for 1 day, the recovery rate was measured. As a result, the coefficient of moisture-absorption of carbon fiber reinforced composite material was the lowest at approximately 3 % because the interface coherence with the fiber and resin are the most strong. Also, after drying process, the recovery rate was 20 percent higher than the others.
Preparation of SiO2/PMMA Organic-Inorganic Hybrid Membrane via Microemulsion Situ Polymerization Technology
Authors: Lu Man , Zhou Yan Yan , Zhu Yi Chen , Lian Jie , Lin Tong Hui , Wang Ting , Wu Li Guang , Fang Ting
Published: August 2013

SiO2 nanoparticles was synthesized by F127/MMA/(NH3+H2O)/TEOS inverse microemulsion, the formation and morphology of nanoparticles were analyzed by Ultraviolet-visible spectrum and transmission electron microscopy, and scanning electron microscope. The results showed that SiO2 nanoparticles were spherical structure and its average particle size was about 25 nanometers. The number of SiO2 nanoparticles in the microemulsion and hybrid membrane was increased slightly with the increase of TEOS content. However, agglomeration of SiO2 nanoparticles appeared in the hybrid membranes at high TEOS content.
Structure and Photoelectric Properties of Dy Doped CdS Polycrystalline Thin Films
Authors: Zou Kai , Li Rong Ping , Liu Yong Sheng , Tian Lei , Feng Song
Published: August 2013

Using chemical bath deposition (CBD) deposited CdS thin films for two times and prepared CdS films contained different thickness Dy-doping layer by connecting using the vacuum electron beam evaporation method, then studied the structure, surface morphology, optical and electrical properties of the films. The results show that no-doped CdS films are the cubic structure and preferentially oriented in the (111) directions. Its conductive type is N type. After Dy doping the CdS thin films are mixed structure by cubic and hexagonal phase, the conductive type is still N type, the uniformity and compactness of the films are improved. At the same time, the proportion of Cd and S atoms in Dy-doping films are more close to the stoichiometric ratio. Dy-doping can also reduce the resistivity of the films, result in an increase of carrier concentration and improve the transmittance in the visible region.
Isothermal Crystallization of PET/PTT-CNTs Composites
Authors: Xie Fang , Liang Hao , Ren Xiao Jun , Chen Yi Fa
Published: August 2013

Isothermal crystallization behavior of PET/PTT-CNTs composites was investigated by DSC. The Avrami equation was employed to describe the isothermal crystallization process. The change of the half-time of crystallization t1/2 suggested that the addition of CNTs in the composites can accelerate the overall crystallization process.
Impacts of N2 Import into Reaction System on the Structures and Properties of the Graphite-Amorphous Carbon Films
Authors: Zhang Bin , Qiang Li , Ling Xiao , Zhang Jun Yan
Published: August 2013

Graphite-amorphous carbon films were grown by sputtered Ni target in Ar/CH4 mixture atmosphere. The impacts of N2 import into reaction system on the structures and properties of the graphite-amorphous carbon films were studied. The results shown that graphite-amorphous carbon films with good hardness, elastic and friction coefficient were obtained at the N2/CH4 flow ratio below 20/80. Beyond the flow ratio of 20/80, the number and size of nanocrystal graphite decrease induce the bad hardness, elastic and friction coefficient of the graphite-amorphous films. Graphite-amorphous carbon films properties were possible correlate with the size and number of nanocrytal graphite and its crosslinking degree to carbon network, especially the former.
The Structure and Properties Research on Poly(Lactide-Co-Trimethylene Carbonate) Film Prepared by Blow Molding
Authors: Chang Jiang Ping , Li Hong Li , Zhang Ying Jie , Zhou Guo Xian , Yuan Ming Long
Published: August 2013

The poly (lactide-co-trimethylene carbonate) copolymers are prepared by ring opening polymerization and catalyzed by SnOct and their films are prepared by blow molding. The 1HNMR study demonstrates that PLA-PTMC copolymers were successfully obtained and the graft way is A-B model. The water vapor permeability (WVP) of the films decreases with the increasing TMC content due to the formation of denser structure. The mechanical measurement reveals that the tensile strength of blown films has been declined with the increasing TMC content, but the elongation at break is improved and the tensile strength can be satisfied for the requirement of film product. Therefore, the copolymer film will be great prospect in the application of food and beverage packing.
Improved Wear and Corrosion Resistance of Ni-P Electroless Deposited Coating with RE Added
Authors: Zhang Jing Yao , Yu Zhou , Xiong Dang Sheng
Published: August 2013

Effect of three kinds of RE ion (Y3+, Nd3+, La3+), which added separately in the Ni-P electroless deposition bath, on coating micro-structure and property such as microhardness, wear and corrosion resistance was investigated. Optimization of organization structure and property of coating attributed to RE-added was analysed by means of ICPM, XRD, SEM and micro-sclerometer, wear testing machine. The results show that the coating has still amorphous structure but higher of phosphorus content due to RE, which added in the bath can make coating grains smaller and more compact. At the same time, improved microhardness, wear and corrosion resistance of coating are observed with RE-added properly. The effect of Y3+ is most remarkable among three RE ions. When the concentration of Y3+ in the bath is 0.04g.L-1, the microhardness, wear loss and corrosion rate in 10% H2SO4 solution of coating is 606HV, 4.9572mg and 0.0064mg.cm-2.h-1, respectively.
Preparation of Polymer Composite Latex via Miniemulsion Polymerization: Fluorinated Acrylate as Co-Stabilizer and Functional Modifier
Authors: Zhao Fu Chun , Liao Shuang Quan , Zhao Yan Fang , Tan Hai Sheng , Xu Nai
Published: August 2013

The silica/polyacylate composite latex was prepared via miniemulsion polymerization. Fluorinated acrylate monomer was used the co-stabilizer and hydrophobic modifier. The effect of fluorinated acrylate on stability of the composite latex was compared with the traditional co-stabilizer. The composite latex and the resultant film were characterized by Fourier transformation infrared spectroscopy, Dynamic laser scattering, Water contact angle. Fluorinated acrylate can stabilize the miniemulsion polymerization as the co-stabilizer and the resultant film has good durability of hydrophobicity under high moisture environments.
Effects of Vanadium on Microstructure and Properties of a Fe-Cr-W-Mo-V Overlaying Alloy
Authors: Xiao Yi Feng , Hou Zhi Wei , Tang Fang , Gong Jian Xun , He Yue Hui
Published: August 2013

A Fe-Cr-W-Mo-V overlaying alloy was prepared on Q235 steel by SMAW with different Fe-V powders added in electrode coating. Effects of vanadium on microstructure, hardness and wear resistance of the alloy were studied with SEM, OM, hardness and wear test. The results show that Fe-V powders content affects welding crack number, which increasing quickly at 0-2%(wt, as fellow), decreasing slowly at 2-20%, disappearing above 22%. With the increase of Fe-V, vanadium-rich carbides number increase, the grain size and hardness increase firstly then decrease above 2, at 20% gain the highest. Conversely, the wear loss decreases slowly first, then increases quickly above 2, wear resistance is the best at 20-22%.
Study on Technology of Multi-Trace Overlapping and Rapid Prototype by Broad-Beam Laser Cladding
Authors: Zhang Yi Shao , Fu Ge Yan , Cao Fei , Li Ji
Published: August 2013

Obvious physical process differences exist between overlapping area and non-overlapping area by broad-beam laser cladding,also the parallel and vertical interface of RP.By comparing the microstructure and performance, the result shows: the microstructure of overlapping area has broken crystal,the size of overlapping area crystal is bigger than the non-overlapping one.Repeated heating makes overlapping area secondary dissolving out and having higher rigidity;Between layer and layer of broad-beam laser cladding RP is metallurgical combination completely,the degree of uniformity of central microstructures performance is good,hardness of the bow shape area between overlapping layer and matrix is greatly increased.
A Preliminary Study on Preparation of MgAlON Refractory
Authors: Gao Fu , Liu Ran , Wang Xing Juan
Published: August 2013

MgAlON is a new type of refractory material. This article summarized the advantages and disadvantages of the preparative technique through different methods including aluminothermic reduction, carbothermal reduction-nitridation, reaction sintering, spark plasma sintering and so on. The future development was also discussed.
Finite Element Analysis of Thermal Stress for Femoral Prosthesis
Authors: Wang Mo Nan
Published: August 2013

Based on the thermo elasticity theory, the stress of femur prosthesis system was analyzed using finite element method. An evaluation for the selection of prosthetic material was presented after discussing the thermo physical property of material which had an effect on the stress of femur prosthesis system. The results indicate that the interface failure is the primary failure form of the femoral prosthesis system and the interface failure is accelerated for the reason of the thermal effect. So the prosthesis with low coefficient of thermal expansion should be selected which can moderate the interface failure in the certain degree.
Fabrication of Porous Alumina Nanofibers with Hollow Structure by Single Capillary Electrospinning
Authors: Liu Peng Chao , Ma Jing Hong , Gong Jing Hua , Xu Jian
Published: August 2013

Alumina nanofibers were fabricated by single-spinneret electrospinning of aluminium nitrate (Al (NO3)3)/polyacrylonitrile (PAN) precursor solution, followed by sintering treatment. The Al (NO3)3/PAN composite fibers and sintered fibers were characterized by SEM, TG, FTIR and XRD. It is found that the obtained alumina nanofibers show porous external surfaces and hollow sections. Upon calcining the composite fibers at 1000 or 1300 oC, the nanofibers are consisted of α-phased crystalline grains. Sintering temperature plays an important role in controlling the morphology and crystal structure of the nanofibers. A mechanism based on Kirkendall Effect was proposed to explain the formation process of the hollow structure.
Surfactant CTAB-Assisted Synthesis and Gas-Sensing Characteristics of SnO2 Nanomaterials
Authors: Zhao He Yun , Jiang Qiu Ping , Li Yue Huan
Published: August 2013

Rutile structure SnO2 nanomaterials was successfully synthesized by cationic surfactant CTAB assisted method from inorganic precursor and alkali source (SnCl4·5H2O and NaOH) solution under microwave radiation. The final products were characterized by XRD, SEM and TEM. The results show that pure and high crystalline of SnO2 nanomaterials was obtained after calcining at 500 °C. The gas-sensing characteristics of SnO2 nanomaterials to formaldehyde, acetone, isopropyl alcohol, xylene, toluene, alcohol, gasoline, ammonia were investigated. The sensor based on SnO2 nanomaterials exhibits good response properties to isopropyl alcohol.
Controllable Preparation of Multishaped Micro/Nanosized Hydrated Nickel Molybdate via Chelator-Assisted Hydrothermal Route
Authors: Zhang Jun , Jiang Zheng Quan , Li Jing Jing , Du Xi Gang , Song Bang Cai
Published: August 2013

Nickel molybdate is one of the significant and frequently-used basis materials for catalyst. The micro/nanohydrated nickel molybdate with different shapes has been successfully prepared via hydrothermal route using chelator as shape-control agent under the pH values from 4.5 to 6.4. The x-ray powder diffractometry, transmission electron microscope and scanning electron microscope were employed for the characterization and analysis of the phase, morphology and size of the resulting products. The chelator plays a key role for the shape and crystalline degree of the hydrated nickel molybdate. With the pH values of the initial suspension set below 4.5 or above 6.4, no any solid products could be obtained despite using the same hydrothermal preparation conditions. The formation mechanism of the related products with multiple shapes has been proposed.
Preparation of TiO2/CNT Composites and Effect of CNT's Structure on Morphology of Nano-TiO2
Authors: Li Feng , Bian He , Zhang Hui
Published: August 2013

Four kinds of TiO2/CNT (or carbon fiber) composites were successfully prepared by the sol-gel method using Ti(OBu)4 as precursor of TiO2, and untreated CNT, carboxylic CNT, hydroxylated CNT and carbon fiber were used as carriers, respectively. After heat treatment at 400 and 800°C, TiO2/CNT nanocomposites and purified TiO2 were obtained. Their structure and morphology were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). The results indicate that different carbon nanotubes and nanofiber have notable influences on the morphology and structure of TiO2 nanocrystals.
Polyaniline Nanofibers Produced via Rapid Initiated Polymerization in a Binary Oxidant System
Authors: Luo Jie Ni , Qin Zong Yi , Wu Qian , Zhou Zhe , Lu Ya Qing
Published: August 2013

Polyaniline (PANI) nanofibers were fabricated via rapid initiated polymerization in a binary oxidant system consisting of ammonium peroxydisulfate (APS) and hydrogen peroxide (H2O2). The influence of the ratios of APS to H2O2 on the morphologies and optical properties of PANI nanofibers were discussed. It is found that the minimum optical band gap of PANI nanofibers with a relatively uniform diameter of 40 nm can be obtained for the ratio of 1:3.
Preparation and Properties of PS/PP/Nano-TiO2 Composites
Authors: Yu Shou Wu , Xiao Shu Juan , Zhang Peng Bo , Zhang Li Jie , Li Yu Qing
Published: August 2013

PS/PP/nano-TiO2 composites are prepared via melt compounding method. We study on the effects of mechanical properties, rheological, heat stability and microscopic structures on the composites. Results show that the impact resistance performance, compatibility, melt index, etc are associated with the addition amount of TiO2.
Effects of PMDI Modified on Physico-Mechanical Properties of Silvergrass Reinforced High Density Polyethylene Composites
Authors: Yu Wang Wang , Li Juan , Cao Yun Ping
Published: August 2013

In this study, the silvergrass (SV) was used to reinforce HDPE composites. The effects of polymeric methylene diphenyl diisocyanate (PMDI) content, slivergrass fibers content on the mechanical, water absortion of wood plastic composites (WPCs) were investigated. It was found that the mechanical properties of the SV reinforced HDPE composites can be improved by PMDI treatment. The highest tensile strength and flexural strength of the composites can be reached with 50% SV contents at the SV: PMDI=6:1. It has been proved that the hydroxyl groups of SV fibers which can react with the-NCO by FTIR. It also can be concluded that the water absorption of PMDI treated WPCs was lower than untreated ones.
Alloy Elements Added in Fe-6.5wt% Si Silicon Steel and their Effect on Ductility and Magnetic Properties
Authors: Cheng Zhao Yang , Liu Jing , Chen Wen Si , Sun Guo Dong , Lin Xi Feng , Zhu Yuan , Zhu Shang , Zhu Jia Chen , Xiang Zhi Dong
Published: August 2013

Fe-6.5wt%Si silicon steel has excellent soft magnetic properties, but its ductility in room temperature is near zero. A lot of researchers tried to improve the ductility by adding alloy elements. In this paper, we summarized the action mechanism and the content of these alloy elements according to the overseas and domestic research status. Al, B, Cr, RE, et al. improved the ductility of Fe-6.5wt%Si silicon steel in low temperature, but reduced its magnetic properties simultaneously. Ni, Ti, Mn, et al. improved the ductility of Fe-6.5wt%Si silicon steel inconspicuously.
Improvement of Thermal Shock Resistance Performance of High Alumina Ceramic Filter Support
Authors: Tian Yue Chao , Liu Xi , Tang Hui , Bu Jing Long , Zhao Dong Mei , Chen Yue Jun , Yu Li Xue
Published: August 2013

Mullite-corundum multiphase ceramic materials were prepared at 1400°C for 2h with bauxite chamotte and clay clinker as raw material (size<74 μm), molded at pressure of 50 MPa. Effect of raw materials composition on sintering and themal shock resistance of composite were researched by measurements of apparent porosity, bending strength，thermal shock resistance and thermal expansion rates, and analysed by XRD and SEM. The results showed that the best weigh percentage of raw materials with better sintering and themal shock resistance are bauxite chamotte 50 wt%, clay clinker 50wt% for mullite-corundum multiphase ceramic materials. The test results for high temperature gas cleaning dust removal technology development and the application of the composite ceramic material has important application value.
Effect of Addition of Fused Alumina Zirconia on the Properties of Unfired Al2O3-C Slide
Authors: Wei Jun Cong , Ai Li , Ji Xiu Mei , Tu Jun Bo
Published: August 2013

Unfired Al2O3-C slides were prepared by using tabular corundum, reactive Al2O3 and fused alumina zirconia (FAZ) as main starting materials, Al powder and Si powder as anti-oxidation agents, phenolic resin as a binder. The effects of addition of fused alumina zirconia on the room temperature physical properties and hot modulus of rupture (HMOR) of unfired Al2O3-C slide were investigated. The phase composition and microstructure were investigated by means of X-ray diffraction (XRD), scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy (EDS). The results showed that with the increase of fused alumina zirconia content, bulk density of the specimens after dried increased, apparent porosity decreased and high temperature strength increased. Phase transformation in ZrO2 could take place at different temperature, accompanying a volumetric expansion and microcrack formation. This would lead to a first increase and then decrease in HMOR. A maximum value was reached at 11 wt. % ZrO2. The thickness of decarbonization increased with increasing ZrO2 content.
Hot Deformation Behavior of as-Cast AZ61 Magnesium Alloy
Authors: Feng Zhong Xue , Shi Qing Nan , Pan Fu Sheng , Tan Jun , Chen Liang Wei , Chen Xi Liang
Published: August 2013

Thermal compression tests of AZ61 magnesium alloy were performed at deformation temperature 25-400°C with strain rates ranged from 0.02 to 20 s-1, and the microstructure was studied. The conventional dynamic recrystallization (DRX) and shear zones were observed on grain boundaries at temperatures above 200°C. The shear zone and the temperature rise are considered to be responsible for the fracture of specimens. For the large internal stress concentration in the shear zones and the deformation incompatibility between matrix and shear zones, the fracture grew along with the shear zones and the failure occurred in the large deformation field of the matrix at the high strain rate 20 s-1 even at 400°C.
Influence of the Temperature on the Mechanical Properties and Fracture Surfaces of 93WNiFe Alloy
Authors: Xu Ying Ge
Published: August 2013

The effect of temperature on the mechanical properties and fracture surfaces of 93WNiFe alloy was investigated in tension with temperature ranges from 10 to 900 degrees. The ultimate strength declined gradually as the temperature increased, and the elongation increases below 400°C but decreases above it. The fracture surfaces changes from tungsten pellet cleavage to detachment of tungsten-matrix.The ultimate strength was influenced by the fracture mode, the elongation influenced by the the deformation of tungsten pellet and matrix.
Effect of Hydrogenation on Microstructure and Mechanical Properties of Ti-6Al-4V Titanium Alloy
Authors: Zhou Li , Liu Hui Jie
Published: August 2013

The α + β dual-phase titanium alloy, Ti-6Al-4V, was thermohydrogen processed with 0.1, 0.3 and 0.5 wt% hydrogen. Effect of hydrogenation on microstructure and mechanical properties of Ti-6Al-4V titanium alloy was systematically discussed. It was found that hydrogen stabled the β phase and leaded to the formation of α martensite as well as δ hydride in the hydrogenated titanium alloy. Mechanical properties of hydrogenated titanium alloy deteriorated with increasing hydrogenation content. The mechanism of hydrogen-induced microstructure/mechanical properties modification in Ti-6Al-4V alloy was elucidated.
Enhancement of Faceted Growth of Primary Al3Ni Phase in High Magnetic Field
Authors: Li Chuan Jun , Chen Long , Ren Zhong Ming
Published: August 2013

Faceted growth of primary Al3Ni phase in the hypereutectic Al-Ni alloy in a high magnetic field was investigated. It was found that faceted growth of primary Al3Ni phase was enhanced in the presence of the magnetic field. However, the fibrous to granular transition of Al-Al3Ni eutectics occurred. The undercooling of primary and eutectic phases during solidification was measured using differential thermal analysis. It was showed that the undercooling of primary phase was hardly changed but that of eutectics markedly increased in the magnetic field. According to Cahn theory of crystal growth, the critical driving force was used to satisfactorily explain the morphology transition in the magnetic field.
Thermal Stress Variation of Titanium Alloy under Laser Radiation
Authors: Cheng Jing Ran
Published: August 2013

Titanium alloy is a premium metal with properties of low density, high hardness and resistance against high temperature and corrosion, the application of which has gained serious explorations in manufacture and military. Laser pulses of different power, duration and beam spot size are employed under room temperature to investigate the thermal stress variation of a titanium alloy plate with the aim of proposing ideal coefficients in laser processing of titanium alloy. The experiment was carried out as numeric simulations of thermal response and thermal dynamo coupling of the titanium alloy plate by using the COMSOL software.
Study on Performance of Beryllium Bronze's Stress Relaxation
Authors: Wang Deng Jiang , Zhang Wei Fang , Fang Xiao Tong , Zhao Li
Published: August 2013

Based on the dynamic analysis of beryllium bronze's stress relaxation, the environmental temperature and outside stress which related to its stress relaxation were discussed. The TEM was been used to observe materials micro-structure during the test of stress relaxation. Then the performances regulation of beryllium bronze's stress relaxation and the variation of its microcosmic organization structure were researched. Results showed that the process of stress relaxation is divided into two stages: accelerating stage and smoothing stage. Besides, the materials microscopic mechanism was analyzed and explained.
Organization and Performance of the Novel High Aluminum Zinc-Based Alloy
Authors: Ji Jia Ming , Shao Hong Hong , Meng Guo Cui , Gu Dong Qing
Published: August 2013

The novel high aluminum zinc-based alloy is prepared by changing composition of the alloy and adding 0.05% mixed rare earth with lanthanum-rich. The microstructure, mechanical properties and thermal expansion coefficient are investigated under as casting condition. The results showed that the novel high aluminum zinc-based alloy had fine microstructure, higher mechanical properties and smaller thermal expansion coefficient compared to the ZA27 alloy.
The Study on Fracture Behavior in Hot Compression of As-Cast Ti60 Titanium Alloy
Authors: Peng Wen Wen , Zeng Wei Dong , Wang Qing Jiang , Zhu Yan Chun
Published: August 2013

Hot compression testing of as-cast Ti60 alloy was carried out 970-1120 °C, 0.01-10 s1 and 30-75%. The fracture behavior of the alloy was investigated by light optical microscope, scanning electron microscope. The result shows that, at high strain rate and large height reduction, 45° transgranular fracture and longitudinal intergranular fracture are observed, which are confirmed to be transgranular cleavage brittle fracture and ductile fracture respectively. Moreover, the cracking degree increases with the increasing height reduction. Besides, the alloy deformed at high temperature exhibits a good ductility, whereas lots of longitudinal cracks occurs on its surface due to the brittle alpha-case formation. Consequently, the systematic analysis on the fracture mechanism for as-cast Ti60 alloy is vitally necessary for the optimization of processing parameters in its cogging process.
The Corrosion Behavior of 07/09Cr2AlMoRE Used for Petro-Chemical Equipment
Authors: Zhang Yu Fu , Ma Ying , Hao Yuan , Guo Hui Xia , Song Wen Ming
Published: August 2013

The stress corrosion property of 07/09Cr2AlMoRE and its welding joint were investigated under different conditions. The results showed that the anti-SSC performance of welding joint was lower than that of the plate through the Sc experiment. The martensite and overheated structure appeared owing to the improper control during welding and heat treatment, which resulted in the lower anti-SSC property of welding joint. The temperature and Ph value had important effect on corrosion rate through analysis the data of comprehensive corrosion. The corrosion rate would rise 1 times when the temperature increased 30°C. The corrosion rate was improved nearly by one order of magnitude when the pH value decreased from 6 to 4. The corrosion surface was uniform and no any corrosion pit, which indicated that the microstructure and chemical component was nearly uniform.
Preparation and Property Studies of Core-Shell Structure Polyacrylate Microspheres for Plastisol
Authors: Song Xiao Li , Cheng Zeng Hui , Chen Ying , Xu Yu Zhi , Wang Chun Peng
Published: August 2013

Soft-core/hard-shell polyacrylate latex with different cross-linking degree and shell thickness were prepared by semi-continuous seed emulsion copolymerization .The size, size distribution and morphology of latex particles were characterized using dynamic light scattering (DLS) and scanning electron microscopy (SEM). The properties of plastisol were investigated by testing their dynamic viscoelasticity and storage stability as well as the mechanical properties. The results showed that the latex particles always keep regular spherical structure throughout the polymerization process; Dynamic viscoelasticity of plasticized system with different cross-linking degree however had little changed. The mechanical properties of the plastigels could be improved by increasing the thickness of shell.
Research on Mechanical Properties, Compatibility, Flame Retardancy, Hot-Air Ageing Resistance of Hydrogenated Nitrile-Butadiene Rubber/Chloroprene Rubber Blends
Authors: Wang Teng Teng , Zhong Guo Lun , Zhou Li Ling
Published: August 2013

The mechanical properties, compatibility, flame retardancy property, hot-air ageing resistance of hydrogenated nitrile-butadiene rubber (HNBR) / chloroprene rubber (CR) blends were investigated. With increasing CR, stress at 100% elongation, shore A hardness, limited oxygen index of HNBR/CR blends increased, while the tensile strength, hot-air aging resistance of the blends decreased. Differential scanning calorimeter (DSC) revealed that it’s incompatible with both HNBR and CR before vulcanization, however they became compatible completely after vulcanization as indicated by Dynamic Mechanical Analysis (DMA).
Properties of Europium (III) Chelating Polymer Film
Authors: Liang Hao , Xie Fang , Chen Yi Fa , Ren Xiao Jun
Published: August 2013

A europium (III) chelating polymer film has been investigated by fluorescence spectrum, lifetime measurement, near-field scanning optical microscopy (NSOM) and m-line method. The obtained film thickness is 1.748μm and refractive index is 1.571. Near-field scanning optical microscopy shows the good surface quality of the Europium (III) chelating polymer film.
High Efficiency Thin Film Silicon Solar Cells
Authors: Xue Chun Rong , Sun Xia Yun
Published: August 2013

High-efﬁciency solar cells based on amorphous silicon technology are designed. Multi-junction amorphous silicon solar cells are discussed, how these are made and how their performance can be understood and optimized. Although significant amount of work has been carried out in the last twenty-five years, the Staebler-Wronski effect has limited the development of a-Si:H solar cells. As an alternative material, nc-Si:H has attracted remarkable attention. Taking advantage of a lower degradation in nc-Si:H than a-Si:H and a-SiGe:H alloys, the light induced degradation in triple junction structures has been minimized by designing a bottom-cell-limited current mismatching, and obtained a stable active-area cell efficiency. All this has been investigated in this paper.
Simulation on the Planar Array Antenna Penetrated to Tungsten Spherical Fragment
Authors: Liu Feng , Shi Quan , Wang Guang Yan , Zhang Bao Quan
Published: August 2013

Assess the array element number of planar phased array antenna which suffers fragments combat damage. A single fragment damage as the research object, the simulation of penetration condition for Tungsten Spherical fragments is developed using the software of ANSYS/LS-DYNA. The penetration of antenna at 0°attack angel and 800m/s is simulated, and we can gain the penetrated distortion data. Based on the data the damage circular is calculated. The last one study was made on x-band planar array antennas, the array elements invulnerability of triangular setting is better than rectangular, and the influence characteristics between the position of the damage circle and the damage of the antenna. The results can be used in a rapid assessment of a battle-damaged Radar repair and maintain inventory of phased-Array element.
Application Status of Superconducting in Magnetic Separation
Authors: Guo Yan Hua , Dai Hui Xin , Yang Jun Long
Published: August 2013

Introduce the basic concepts of the superconducting and superconducting magnetic separation, the species and properties of superconducting material. Through the current use situation of superconducting magnetic separation machine to explain the advantages and disadvantages about superconducting magnetic separation machine than conventional magnetic separation machine. The paper analyzes the main problems of the superconducting magnetic separation. With a clear direction of superconducting magnetic separation research, improve the superconducting magnet of the critical temperature, especially in liquid nitrogen temperature, even at room temperature, which is a very important research subject.
Investigation of Wave Field Stress Method in Seismic Analysis of Underground Structures
Authors: Zhang Zhi Guo , Mu Chun Lai , Liu Chan Ge , Zhang Cun Hui
Published: August 2013

It is indicated by many earthquake damage surveys that the seismic design of underground structures is a key issue for underground caverns. However, methods regarding seismic design of underground caverns have not been covered by current national codes. The wave field stress method is a kind of method in which the additional stress induced by earthquake is calculated based on the dynamic features of structures. Based on the earthquake damage survey of the underground cavern at Yingxiuwan hydropower plant after Wenchuan earthquake, the wave field method is used to analyze the structural response under earthquake impact. After comparing calcluation results to field findings, it is discovered that they are basically in good agreement. Therefore, it is concluded that the wave filed stress method can be adopted to assist the seismic design of underground structures during the preliminary design phase of project.
Nonlinear Numerical Analysis of SRC Frame End Joint
Authors: Kong Jie , Zou Yun , Li Cheng , Wan Zhi Wei
Published: August 2013

Nonlinear numerical analysis for the stress performance of RC beam - SRC column and SRC beam - SRC column frame end joints are processed in this paper with the finite element software of ABAQUS. Compared with experimental results, simulation results are found to be reasonable. In order to study the influence of steel bone content on the frame node, two kinds of frame joints are contrastively analyzed under monotonic loading and cyclic loading. The load-displacement curves and hysteretic curves show that with the steel ratio increases, the ultimate bearing capacity improves and the seismic performance becomes better.
A Study on the Stability of a Vehicle with Lifting Utility
Authors: Jung Dong Won , Jeong Ji Hyun , Woo Seung Min , Jang Eun Sil , Park Kee Jin , Son Jae Hwan
Published: August 2013

Due to recent requirements for the systematization of cultivation in agriculture, many kinds of agricultural machines have been used. Vehicles with lifting utility are used to harvest and transfer crops and fruit. These vehicles have buckets that can be moved up and down to harvest crops and fruit in high places. These vehicles often have to operate on unpaved slopes. Therefore, the stability of the vehicle should be studied in the development stage. In this study, the overturn angles of the vehicle in three conditions have been calculated to determine stability. As a result, it could be concluded that these vehicle models are stable.