bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on the Performance of SiAlON-Graphite-SiC Composites
Authors: Wang Wen Wu , Cao Hui Yan , Zhang Zhi Ping , Wang Jing Xiang
Published: July 2011

Based on SiC grains and powder, flake graphite, AlN powder, Silicon powder, sintered alumina ultra-fine powder as the starting materials, the sample of SiAlON-Graphite-SiC composites was prepared by firing under N2 atmosphere at 1 550°C and then analyzed in terms of high temperature performances by XRD, SEM and EDAX etc. The interrelation between composition, structure and performance of the material was also investigated. It indicates that this material provides excellent thermal shock resistance and molten alkali resistance, also proper oxidation resistance and applicable as the inner lining of the blast furnace.
Comparison of Precipitants in Preparing Ultrafine ZnO Powder
Authors: Shen Xiao Yi , Liang Yuan , Sun Yi , Zhai Yu Chun
Published: July 2011

With zinc acetate used as raw material and polyethylene glycol employed as dispersant, ultrafine ZnO flower-like powder was successfully synthesized by hydrothermal method using NaOH and NH3·H2O as precipitants. The influences of the precipitants on the morphology of the ZnO powder were discussed. The as-synthesized ZnO flower-like powder was composed of lots of microrods with hexagon figure. The ZnO flower-like structures synthesized using NaOH were more regular and uniform than that obtained using NH3·H2O. The ZnO flower-like powder was hexagonal wurtzite structure with high purity. The exciton absorptions of the two ZnO flower-like powder both appeared at 300 nm in UV-VIS spectrum.
Batch Supercritical Hydrothermal Synthesis of CeO2 Nanoparticles
Authors: Zhao Dan , Li Da Liang , Wu Xin Qiang , Han En-Hou
Published: July 2011

CeO2 nanoparticles with diameter of about 5 nm were prepared by batch supercritical hydrothermal synthesis method at 390 °C without additional treatment. It was found that the characteristics of products depended on the pH value, reactant concentration (C0), and reaction temperature. The reaction time and coexisting cations (Li+, Na+ and K+) had little effect on the size and morphology of CeO2 particles. Uniform CeO2 nanoparticles were synthesized at 390 °C, pH = 9 and C0 = 0.06 M. The mechanism for batch supercritical hydrothermal synthesis of CeO2 nanoparticles is discussed.
Enhancement of Thermal Conductivity with Carbon-Encapsulated Copper Nano-Particle for Nanofluids
Authors: Pang Jin Shan , Zhang Hai Yan , Li Li Ping
Published: July 2011

Carbon-encapsulated copper nanoparticles were synthesized by a carbon arc discharge method. The particles were characterized in detail by transmission electron microscope, high-resolution transmission electron microscopy, thermogravimetric and differential scanning calorimetry. The result showed that the outside graphitic carbon layers effectively prevented unwanted oxidation of the copper inside. The dispersion behaviors and thermal conductivity of Carbon-encapsulated copper nanoparticles in water with different dispersants were investigated under different pH values. The results showed that the dispersion and thermal conductivity enhancements of Carbon-encapsulated copper nanoparticles nanofluids are higher than that of copper nanoparticles.
Improvement of Tribological Behaviour of Biomedical Nanocrystalline Titanium by Magnetron Sputtered CNx/SiC Double Layer Films
Authors: Ji Jia Ming , Xu Xiao Jing , Chen Dan , Xin Xi Ling , Tian Kun , Sheng Xin Lan
Published: July 2011

The nano-indentation response and the friction and wear properties of the CNx/SiC (carbon nitride /silicon carbon) double layer thin films (SiC films as interlayer) deposited on nanocrystalline titanium substrate using magnetron sputtering technique at room temperature were investigated. The results show that the CNx films exhibited a low nano-hardness of 8.0 GPa and Young's modulus of 55.0 GPa but a high hardness-to-modulus ratio of 0.146. As sliding against Si3N4 (silicon nitride) ball under Kokubo simulation body fluid (SBF) at room temperature, the CNx films exhibited the superior tribological properties with the friction coefficients of about 0.1 and the special wear rate of about 1.6×10−6 mm3/Nm.
Fabrication and Characterization of YAG Nanopowders by Co-Precipitation under Ultrasonic Radiation
Authors: Wang Li Li , Chen Jin , Yang Guang Cheng , Nie Fu De
Published: July 2011

A carbonate precursor with high sintering activity was prepared by co-precipitation method under ultrasonic radiation. This precursor precipitant completely transformed to pure YAG phase after being calcined at 900 °C for 4 h. The properties of YAG nanopowders obtained under different synthetic process were studied by XRD, TG-DSC, FT-IR and SEM. The results show that the ultrasonic radiation can fine the precursor and reduce its agglomeration. YAG nanopowders with an average particle size of about 60 nm were obtained and particles were sphere-shaped with good dispersity.
The Characteristics of Natural Occurred Carbon Nanotubes - from Transmission Electronic Microscopy and Raman Spectroscopy
Authors: Feng You Li , Yu Li Jing
Published: July 2011

The natural carbon nanotubes(CNTs) have been found in the Sujiquan graphite ore deposit and the high resolution transmission electronic microscopy and the micro laser Raman Spectrum have been used to study their structure. The length of CNTs from n nm to 300nm and width vary between 0.n nm and 30 nm. The RBMs at 462cm-1 in the first-order Raman spectrum of natural CNTs should originate from the inner diameters of 0.5nm. The obvious characteristic peak is at 1343.41 cm-1and 1577.08 cm-1 indicating high graphitization degree. The S1～S4 peaks also found in the second-order Raman spectra.
Characterization and Thermal Properties of the Microencapsulated PCM Slurry
Authors: Zhang Yan Lai , Rao Zhong Hao , Wang Shuang Feng , Zhang Hong , Li Li Jun , Zhang Ming Long
Published: July 2011

The microencapsulated phase change material (PCM) slurry is a kind of mixture with the PCM microcapsule particles and water. The actual PCM in the microcapsule is composed of several kinds of paraffin waxes (mainly nonadecane), and the membrane is a type of melamine resin. This study is focused on preparation, characterization, and thermal properties of the microencapsulated (PCM) slurry. The microencapsulated PCM particles are prepared by in-situ polymerization method. Four different levels of mass concentration Cm of the PCM will be used such as Cm=10%, 20%, 30% and 40%, respectively. The diameter of the particles is distributed in the range of 0µm~4.5µm, and most (61%) of them occur in the range of 0.5µm~1.5µm. The average volumetric diameter of the PCM microcapsule particle is about 0.78µm. And the average membrane thickness is about 11nm.Thermal properties of the microencapsulated PCM slurry are determined using differential scanning calorimeter (DSC). From DSC analysis, the melting and freezing temperatures and the latent heats of Cm=30% are measured as 38°C and 25°C, and 37.9 kJ/kg, respectively. The rheological properties are measured by a rotating cylinder type of rheometer, which the slurry shows the pseudo plastic non-Newtonian fluid behavior with the power-law fluid index n.
Investigation of Ultrasonic Electroplating Ni-P Coatings on Nd-Fe-B Permanent Magnet
Authors: Wang Fei Fei , Li Li
Published: July 2011

In order to improve the corrosion resistance of Nd-Fe-B, the new technological process is done which involves electroplating Ni–P alloys with ultrasonic. The influence of ultrasonic on electroplating Ni–P alloy on Nd-Fe-B was studied by using microscope, adhesion test and NaCl solution immersion test. The results showed that the Ni–P alloy deposit on Nd-Fe-B is rough and has poor adhesion without ultrasonic agitation; however, the Ni–P alloy deposit on Nd-Fe-B with ultrasonic agitation has more compact and uniform microstructure, smoother morphology. At the same time, the adhesion and corrosion resistance are greatly enhanced.
Effect of Active Alumina on Sintering Behavior of Andalusite Powder
Authors: Li Liu Sheng , Cao Qin Cun , Xu Guo Hui , Liao Gui Hua
Published: July 2011

The effect of active alumina on the sintering behavior of andalusite powder was studied. The results revealed that the addition of active alumina delayed the decomposition of andalusite and primary mullitization, beginning temperature of secondary mullitization was about 1350°C. The temperature at which the effect of expansion of the secondary mullitization emerged was about 1400°C, and the expansion effect of secondary mullitization did not yet complete at 1600°C.
Corrosion Mechanism on Oilwell Cement in Formation Water with High Content of CO2&H2S
Authors: Cheng Xiao Wei , Ma Yong , Li Zao Yuan , Guo Xiao Yang
Published: July 2011

Usually, marine carbonate gas reservoirs contain formation water with high content of CO2&H2S, It is difficult to satisfy the requirement of cementing quality in the gas reseroirs exploration due to the corrosion effect of formation water on cement. In this thesis, corroding tests of cement in formation water, which derived from a development well in northeast Sichuan province, were based on the simulation environment condition of 90°C under 0.1 MPa, 5 MPa and 10Mpa. Performances of cement including mineral composition, microstructure and permeability before and after corrosion were measured by TG-DTA, SEM, XRD and gas permeability and porosity of dense rock core tester. The results show that main corrosion products of cement being corroded in formation water with high content of CO2&H2S are ettringite, CaCO3 and CaSO4, both strength reduction and gradual rising of permeability can occur as testing pressure increasing. Accordingly, the corrosion mechanism and the damage process of cement under formation water with high content of CO2&H2S are expounded in the end.
Study on Strength and Durability of Concrete Containing Recycled Coarse Aggregate Manufactured with Various Method
Authors: Quan Hong Zhu
Published: July 2011

This paper presents the results of experimental study on the effects of adhered mortar content on strengths and durability of concrete. Compressive, tensile and shear strengths, modulus of elasticity, drying shrinkage and carbonation were tested on concrete mixtures with the water cement ratio of 0.43, 0.50 and 0.60 using 3 kinds recycled coarse aggregate and a riversand. The test results of concrete indicated higher compressive, tensile amd shear strengths and higher modulus of elasticity for concrete using recycled corase aggregate with lower adhered mortar content, lower absorption and higher specific gravity. Recycled aggregate with higher adhered mortar content also showed significunt adverse effects on drying shrinkage and carbonation. In conclusion, the upper limit of adhered mortar content of coarse recycled aggregate to keep up the quality of aggregate and concrete equal to natural coarse aggregate and those concrete is considered to be 15%.
Research on Pavement Performance of Dense Skeleton Lime Fly-Ash Stabilized Aggregate in Gravelly Conditions
Authors: Guo Jian Ning , Ma Shi Bin , Wang Lei
Published: July 2011

Lime fly-ash stabilized aggregate is the commonly material used as semi-rigid base course of pavement and the performance of pavement directly affects its service life. This paper focuses on pavement performance of dense skeleton lime fly-ash stabilized aggregate in gravelly conditions. Test results show that coarse aggregate of lime fly-ash stabilized aggregate can form skeleton structure and has the advantage of high strength and other better material properties which can meet the requirements pavement.
The Research on Dense Packing Concrete Mix Proportion
Authors: Yao Shao Wei , Wang Chang Rui , Gao Zhen Guo
Published: July 2011

According to the postulation on dense packing of aggregates, the paper discusses the dense packing method of various aggregates and its coefficients, and offers the mix proportion design method of concrete. The research results indicate that using method of the mix proportion design based on the theory on dense packing of aggregates, aggregates can play a maximum role, especially the micro-aggregate effect of the fly ash, then the compactness of concrete is raised effectively, the quantity of cement is reduced and the endurance of concrete is improved.
Study of Ageing of Copper Foils in the Outdoor Environment
Authors: Tian Xing Ling , Zheng Ming Tian , Ma Qing Lin , Li Zhi Lin
Published: July 2011

The ageing of copper foils and Copper foils-surfaced in UV rays are studied by 3D Video, SEM, EDX, which shows that copper foils and Copper foils-surfaced are in different level of ageing; embossment and crack which are the most obvious aging characteristics found by SEM, obviously, the ageing velocity of copper foil -surfaced is higher; The sulfur is found in the powder-like material around the embossment on the surface of copper foils by EDX, which indicates that sulfur is involved in the process of aging.
Numerical Analysis on the Load-Carrying Capacity for the FRP Reinforced Four-Point Bending Concrete Beam
Authors: Qu Hong Chang , Wu Chang Qing , Chen Ling Ling
Published: July 2011

In this paper, different types of debonding failure modes are described. Study of concrete cracking behavior and interfacial debonding fracture in fiber reinforced polymer (FRP)-strengthened concrete beams are carried out. A finite element analysis is performed to investigate the different types of debonding propagation along FRP–concrete interface and crack distribution in concrete. The proposed FE, denoted as FRP–FB (force-based) beam, is used to predict the load-carrying capacity and the applied load-midspan deflection response of RC beams subjected to four-point bending loading. Numerical simulations and experimental measurements are compared based on numerous tests available in the literatures and published by different authors. The numerically simulated responses agree remarkably well with the corresponding experimental results. It demonstrates that the proposed two-dimensional frame finite element (FE) is able to accurately estimate the load-carrying capacity of reinforced concrete (RC) beams flexurally strengthened with externally bonded fibre reinforced polymer (FRP) strips and plates.
Mechanism of Melt Treatment Improving Thermal Stability and Glass Forming Ability of the Al-Ni-Y Amorphous Alloy
Authors: Mu Juan , Ge Jing Qi , Li Wen , Zhang Haifeng , Hu Zhuang Qi
Published: July 2011

The mechanism of melt treatment improving the glass forming ability (GFA) and thermal stability of the Al84.5Ni5.5Y10(in atomic percentage) alloy was studied. An yttrium-rich metastable high-melting-temperature-phase is found to be responsible for the deterioration of GFA because it induces the heterogeneous nucleation of the crystals in the solidification process. It can be eliminated through melt treatment as adopted in this paper, resulting in stabilizing the thermal stability of the undercooled melt and enhancing the GFA of the investigated alloy with higher thermal stability for the resultant amorphous phase.
The Study on the Apoptosis of Rat’s Granule Cells Induced by Ethanol
Authors: Li Shu Feng , Hao Li , Tong Hui Li , Zhao Dan Dan , Yan Yun Qin
Published: July 2011

To drink excessively for long time would damage human genital system seriously, nevertheless there is still less researches on the effect of ethanol to granule cells. Here we adhibit means of TUNEL coloration and flowcytometry examination and treat ex vivo granule cells with ethanol at different chroma and time. The result shows that ex vivo granule cells treated with ethanol at different chroma and time can be observed distinctly the morphologic character of cell apoptosis, and the percentage of apoptosis of ex vivo granule cells induced by ethanol would increase in a certain bound of chroma and time as the increasing of the chroma and time, indicating that ethanol can produce dysgenesia by inducing the apoptosis of granule cells of ovaries. The damage of ethanol for granule cells arouses people to control drinking and nip drinking evil in the bud, which is a world of practical importances for human’s procreate and health.
Experimental study on the Crack Initial Stress and the Crack Damage Stress of Red Sandstone Under Different Strain Rate Conditions
Authors: Chen Can Shou , Fan Peng Xian , Li Wen Pei
Published: July 2011

In order to investigate the progressive failure process of brittle rock, the mechanical properties of red sandstone from southeast Shandong province were systemic studied. The stress-strain curves and failure modes of samples under different strain rates were recorded as original data. Based on these data, the axial stiffness, the volume strain, the crack volume strain, and so on were deduced for further analysis. The crack initial stress and the crack damage stress were identified by Moving Point Regression Technique and stiffness curves. The influence of strain rate on the micro-cracking process and the ultimate compression strength of red sandstone were then studied. The results show that: as the strain rate increases, the ultimate compression strength first decreases and then increases as the strain rate increases, and the ratio of crack initial stress/ultimate compression strength and crack damage stress/ultimate compression strength decreases.
Analysis of Heat Conduction of Anisotropic Building Materials
Authors: Su Shun Yu , Chen Jian
Published: July 2011

Heat conduction in anisotropic materials is quite different from that in isotropic materials. Heat flux vector is commonly not perpendicular to the isothermal surface in anisotropic materials. The advantage and disadvantage of anisotropic materials were analyzed in this paper. The thermal conductivities at one point are not equal in all directions for anisotropic materials. The technique of double skin facade has been successfully applied in many building designs. The application of combining building envelope of anisotropic materials and double skin facade was proposed to avoid its disadvantage. Basing on the combination of anisotropic materials and double skin facade in building envelope, the indoor cooling and heating load decrease in summer and winter respectively. Especially in summer, the effect of energy saving is obvious since the partial magnitude of conductive heat in the envelope made of anisotropic materials could be brought out from the cavity of double skin facade by natural or forced ventilation through it.
Microstructure and Strength Characteristics Analysis of Shrinkage-Compensating Shotcrete
Authors: Huang Wei , Ma Qin Yong
Published: July 2011

Due to the easy cracking of shotcrete, shrinkage-compensating shotcrete is researched and its micro-structure and strength properties are analyzed. Firstly, cement slurry is made by CSA, accelerating agent and two different cements. When hydrated 3 days and 28 days , hydration products of cement slurry are analyzed by SEM and XRD in feature, crystal characteristics and mineral compositions. The compatibility of the two different cements and admixtures is studied in apparent characteristics, and the fact that Portland cement is more suitable for making shrinkage-compensating shotcrete is obtained. Then, mechanical properties of concrete which consists of Portland cement, expansive agent and steel fiber are did to analyze the influence of strength characteristics caused by mix amount of expansive agent and steel fiber. The results show that the compression strength and tensile strength of concrete improve with the increasing mix of steel fiber. Incorporation of the expansive agent is greater impact on concrete strength, when mix amount of expansive agent is 8%, strength properties are the best. When mix amount of steel fiber is 1.0% and expansive agent is 8%, the effect of cooperative enhancement is the best.
Investigation of Aging Kinetics of SBS Modified Asphalt Based on Rheological Properties
Authors: Ouyang Jun , Sun Da Quan
Published: July 2011

on the analysis of the ageing kinetics model, ageing kinetics equation has been established on the basis of complex modulus. Rheological properties test have been carried out on SBS modified asphalt and base asphalt. The results demonstrate that when asphalt material in ageing process, the hypothesis that complex modulus is inversely proportional to the concentration of reactant assumptions of ageing reaction is established, on the basis of which, ageing kinetics constant has been obtained. Ageing kinetics equation has been validated by using measured data, it shows that, SBS modified asphalt owns higher reaction activation energy, a good anti-ageing property as well, that the measured data can keep accordance with calculated data, which demonstrates ageing kinetics equation is established reasonably on the basis of complex modulus. The equation can well describe rheological state changes of asphalt in ageing process.
Study on Solid Phase Crystallization of Silicon Films Deposited on Different Substrates
Authors: Chen Qing Dong , Wang Jun Ping , Zhang Yu Xiang
Published: July 2011

Porous silicon were prepared by electrochemical corrosion. Undoped and boron doped silicon films were deposited on quartz substrate、porous silicon and silicon substrate by PECVD,and were solid phase crystallized at different temperature and different hours. The microstructure of films before and after annealing were studied by Raman and XRD. The results show that:the crystallization of films deposited on porous silicon and monocrystalline silicon substrate are better than quartz substrate; The substrate which has silicon crystal lattice play an important role of seed crystal in the solid phase crystallization, the same grain orientation film can be grown on certain condition.
Effect of the Thickness of Cr Interlayer on the High-Frequency Characteristics of FeCoTa/Cr/FeCoTa Multilayers
Authors: Li Shan Dong , Xu Feng , Liu Ming , Hu Yi , Wu Jian Peng , Cai Xin Le , Qiu Jie , Lin Jian Hua , Duh Jenq Gong
Published: July 2011

The effect of non-ferromagnetic Cr interlayer on the high-frequency ferromagnetic properties (HFFMPs) was investigated by use of FeCoTa/Cr/ FeCoTa triple layered films. In conventional thought, the metal interlayer gives rise to a high eddy current loss and therefore a deteriorated HFFMP. However, it is found that HFFMPs depend on the thickness of Cr interlayer. The HFFPMs are improved by Cr-interlayer with a thickness less than 12 nm (sample C1). Comparing with the Cr-interlayer-free FeCoHf single layered film (sample C0), the magnetic anisotropy field of C1 dramatically increases from 185 Oe for C0 to 558 Oe for C1. As a consequence, a high ferromagnetic resonance frequency over than 3 GHz is achieved for sample C1. When the thickness of Cr-interlayer is more than 120 nm (C2), the HFFMPs are reduced due to the increase of eddy current loss and magnetic decoupling between the ferromagnetic layers.
Synthesis of Monodiperse Carbon-Coated Lithium Iron Phosphate
Authors: Ye Qing , Hao Jun Jie , Guo Zhi Meng
Published: July 2011

Carbon-coated lithium iron phosphate (LiFePO4/C) powders were synthesized by a simple hydrothermal method and incipient wetness impregnation. The structural and morphological properties were investigated by XRD and SEM. The results show that the LiFePO4 powders are composed of small plate particles with diameter size of 1-3μm and thickness of 0.2μm. Through incipient wetness impregnation, monodisperse LiFePO4/C particles were obtained and carbon was uniformly distributed over LiFePO4 particles to avoid the direct contact of them, which reduces the trend of agglomeration of the particles during the calcinations process.
Modification of Recycled Melamine-Formaldehyde Plastic on Polypropylene
Authors: Yang Ming Shan , Li Lin Kai
Published: July 2011

The modification process of recycled melamine-formaldehyde(MF) plastic on polypropylene(PP) has been studied, and the optimal compounding parameters were obtained by twin extruding system in this paper. The results showed that with increasing of recycled MF plastic in PP, the tensile strength, elongation at break, molding shrinkage and impact strength decreased, the modulus, heat distortion temperature(HDT) and melt flow rate(MFR) increased, which indicates that the addition of recycled MF plastic can improve rigidity, heat resistance, size stability and flowability of PP. More importantly, the oxygen index(OI) of PP was increased with the addition of recycled MF plastic, which indicates that recycled MF plastic can improve the flame-retardant property of PP.
Several Measures to Improve the Mechanical Properties of Hand-Pushing Tapping Knife
Authors: Huang Hui , Li Ming , Cui Zhen De , Zhang Jin
Published: July 2011

This paper describes the structural characteristics, manufacturing processes and quality problems of hand-pushing tapping knife for natural rubber tree milk and suggests several measures to improve its mechanical properties effectively by analyzing relevant factors that affect hand-pushing tapping knife’s mechanical properties.
Structure and Magnetic Properties of MnAl/α-Fe Nano-Composite Powders Prepared by High-Energy Ball Milling
Authors: Wang Hai Xia , Si Ping Zhan , Jiang Wei , Liu Jin Jun , Lee Jung Goo , Choi C.J. , Ge Hong Liang
Published: July 2011

Novel nano-composite powders composed of hard-magnetic Mn54Al46 and soft-magnetic α-Fe were prepared by high-energy ball milling. The effect of α-Fe and preparation conditions on the structure and magnetic properties of the composite powders has been investigated. The ε-MnAl transforms to γ-MnAl, τ-MnAl, and β-phase under ball milling and annealing. The saturation magnetization and coercivity of the two-phase samples decrease with increasing temperature for the τ-phase decomposes at elevated temperatures. With increasing iron content, the coercivity decrease first and then increase up to 0.33 T when the Fe content is 10 wt%. Further addition of the magnetically soft iron phase would result in a decrease of the coercivity.
Synthesis and Properties of Waterborne Polyurethane-Acrylate Hybrid Emulsion Modified by Organic Silicane
Authors: Lai Xiao Juan , Shen Yi Ding , Wang Lei
Published: July 2011

Waterborne polyurethane emulsions were synthesized with isophorone diisocyanate(IPDI), dihydromethyl propionic acid(DMPA) and poly-ε-caprolactone glycol(PCL), and then reacted with hydroxy-ethyl acrylate(HEA) and 3-aminopropyltriethoxylsilane(APTES) to cap the terminal -NCO groups. The polyurethane emulsions were used to copolymerize with acrylates to synthesize the modified waterborne polyurethane-acrylate hybrid emulsions. The structure, thermal stability and crystallinity of modified polyurethane were studied by FTIR, TG, XRD and the mechanical properties of modified polyurethane films was also investigated. The results show that crystallization of the modified waterborne polyurethane decreases and thermal stability is improved. When the mass fraction of acrylate is 20% and APTES content is 15%, tensile strength of the modified polyurethane films can reach 23.9MPa and elongation at break is 247%.
Manufacturing Technique and Physical Properties of Environment-Protective Composite Nonwoven Fabrics
Authors: Lin Jia Horng , Chen An Pang , Lin Jan Yi , Lin Ting An , Lou Ching Wen
Published: July 2011

Rapid technical advancement threatens the earth ecology, driving people by degrees to develop green energy and green products. Tencel® fiber uses natural fibers. Products made of Tencel® fiber could be biodegraded, which solves the problems for the increasing consumptions of disposable nonwoven product. In this research, Tencel® fiber, polylactic acid (PLA) fiber, and high absorbent fiber (HAF) were used to produce Tencel®/PLA/HAF composite nonwoven fabrics. Among the nonwoven processing parameters, to increase the Tencel® fiber content helped heighten the water absorbency. When there were 80 wt% Tencel® fibers, the basis weight was 100 g/m2 and the needle-punching density was 300 needle/cm2, the Tencel®/PLA/HAF composite nonwoven fabric exhibited the optimum water absorbency in cross machine direction (CD), which was 5.0 cm. The air permeability of the Tencel®/PLA/HAF composite nonwoven fabrics reached 164.4 cm3/cm2/s when the basis weight was 100 g/m2 and the needle-punching density was 300 needle/cm2
Photocatalytic Degradation of Gaseous Acetone by a Self-Prepared Nano-Sized Composite TiO2/In2O3/SnO2 Film Photocatalyst
Authors: Yuan Chung Shin , Tsai Hsieh Hung , Wu Jeng Fong , Guo Bo Cheng , Hung Chung Hsuang
Published: July 2011

The objective of this study is to decompose gaseous acetone ((CH3)2CO) by a self-prepared nano-sized composite TiO2/In2O3/SnO2 film photocatalyst that was prepared by a multi-target vacuum sputter operating at a vacuum pressure of 3 mtorr. The operating parameters investigated for the sputtering process included oxygen to argon ratio (O2/Ar), sputtering temperature, substrate materials, substrate layers, and sputtering duration. The nano-sized composite TiO2/In2O3/SnO2 film photocatalyst was mainly composed of anatase with a few rutile. The surface roughness of the TiO2/In2O3/SnO2 film photocatalyst in terms of RMS ranged from 2.292 to 7.533 nm, while the thickness of the single- and double-layer film photocatalysts were 473.5 and 506.0 nm, respectively. Gaseous acetone was initially injected into and further degraded in a self-designed batch photocatalytic reactor containing the nano-sized composite TiO2/In2O3/SnO2 film photocatalyst. Experimental results indicated that the highest acetone degradation efficiency of 99.9% was obtained at 50°C and 1 atm with the incident of near-UV illuminated by a fluorescent black light lamp. Under the incidence of blue light (430-500 nm), the reaction rates of acetone decomposition were 2.353x10-5 and 3.478x10-5 μmole/cm2-sec for using single- and double-layer TiO2/In2O3/SnO2 film photocatalysts, respectively.
Preparation and Photocatalytic Activity of Pb2+- SiO2-TiO2 Composite Catalyst
Authors: Qiu Zu Min , Lv Ya Zhou , He Zong Jian
Published: July 2011

Pb2+-SiO2-TiO2(Hereinafter referred to as PST) composite catalysts were prepared by sol-gel method from tetrabutyl titanate(TBOT),tetraetethyl orthosilicate(TEOS) and lead nitrate. Properties of the catalyst were characterized by means of XRD and FT-IR. In addition, the photocatalytic activities of Pb2+ doped silicon-titanium composite samples were evaluated by the result of photocatalytic degradation of methyl orange as a model reaction under simulated sunlight.The results have been showed that the optimum Pb2+ doping concentration is 1.5% and the optimum heat treatment temperature is 500°C. Photocatalytic degradation conversion of methyl orange (10 mg/L) on PST catalyst could reach above 90.0% under simulated sunlight for 3h.
Research on Correlation of Total Bacterial and other water quality index in Water Distribution Network
Authors: Li Song Hu , Li Jie , Dai Dong Sheng
Published: July 2011

The water qualities of 5 waterplants were studied by investigating the total bacterial colony, oxygen consumption, free oxygen, and the turbidity. The results showed that the quality of water from ground water in the Industry North Road waterplant is better than those in Yuqing and Quehua which derived from the Yellow River indicated tipical seasonal chang. The quality of the outlet is mainly affected by the quality of raw water. The correlation analysis indicated that total number of colony did not significantly correlated to other indicators.
Adsorption Behavior and Thermodynamic Characteristics of p,p’- DDT on Expanded Graphite
Authors: Zhou You Ya , Yan Zeng Guang , Kim Kinam
Published: July 2011

The adsorption of p,p’-DDT onto expanded graphite (EG) in aqueous solutions was investigated under varying conditions of p,p’-DDT concentrations, adsorbent doses, pH, and contact time. The removal efficiency of p,p’-DDT from the aqueous solutions remained constant in a range of pH 2 to 10, and the thermodynamic data followed the type II adsorption isotherm characterized by a spontaneous process. At lower concentrations, adsorption equilibrium of p,p’-DDT onto EG was fitted to Freundlich isotherm. Dynamic modeling of the adsorption showed that the first order reversible kinetic model was held for the adsorption process within the range of experimental concentration. It was suggested that expanded graphite can be used for efficient removal of p,p’-DDT from water and wastewater.
Preparation, Characterization, and Oxidative Dehydrogenation of C3H8 with CO2 of V-Cr/SBA-15/Al2O3/FeCrAl Metal Monolithic Catalysts
Authors: Zhang Hong Jiang , Jia Zhi Gang , Ji Sheng Fu
Published: July 2011

A series of V-Cr/SBA-15/Al2O3/FeCrAl metal monolithic catalysts withV content of 10wt% and Cr contents from 0 to 12.5wt% were prepared. The structure of the catalysts was characterized using XRD, XPS and TPR techniques. The catalytic activity for oxidative dehydrogenation (ODH) of propane with CO2 was evaluated. The results indicate that the mesoporous structure of SBA-15 was retained after vanadium and chromium incorporation and the vanadium species were well dispersed. The V-Cr/SBA-15/Al2O3/FeCrAl catalyst with 10wt% V and 10 wt% Cr exhibited the best activity with a propane conversion of 49.9% and a propylene selectivity of 86.5% at 650 °C.
Preparation of Dialdehyde Konjac Glucomamman
Authors: Xu Dong Ying , Liao Zheng Fu , Zhao Mou Ming , Ren Jiao Yan
Published: July 2011

Dialdehyde konjac glucomannan (DAKGM) was synthesized by konjac glucomannan via sodium periodate (NaIO4) as an oxidant and characterized by NMR and FTIR spectroscopy techniques. The results indicated that the oxidization of KGM catalyzed by NaIO4 was highly selective for C2 and C3 of sugar units to form aldehyde group. Further, the solution behaviors of DAKGM were investigated by steady-state fluorescence. DAKGM exhibited two emission peaks at maximum wavelength 425 nm and 465 nm, respectively.
Preparation of Au and Au-Ce Catalysts Supported on Acid-Activated Bentontie and its Catalytic Performance
Authors: Zhang Rong Bin , Yao Liu Jing , Ju Yan
Published: July 2011

Acid-activated by H2SO4 was applied to modify bentonite. Acid-activated bentonite supported Au catalyst was prepared by deposition-precipitation and compared with SiO2 supported one. CTAB was used to modify the surface of acid-activated bentonite. Au-Ce/bentontie catalyst was prepared by adding Ce into catalyst as assistant. CO oxidation was used to evaluate the catalytic activity of samples. These samples were characterized by BET, XRD, ICP and CO-TPD. The activity results showed that Au/Bentonite was more active than Au/SiO2. The BET results showed that the surface area and pore volume of acid-activated bentontie had a substantial improvement. Using the bentontie acid-activated by 30wt%H2SO4 as supporter，the Au-Ce catalyst has a better catalytic performance than Au catalyst.
Synthesized WO3/ZrO2 Nanocomposite as the Catalyst for Preparation of Peracetic Acid
Authors: Li Mei , Chen Zhi Ming
Published: July 2011

Nanosized material tungstate zirconia (WO3/ZrO2) was prepared by surfactant -assisted precipitation. Structural characterizations of the catalyst were performed by N2 adsorption– desorption and FTIR pyridine adsorption spectroscopy. Preparation of peracetic acid (PAA) from acetic acid (AA) and hydrogen peroxide (HP) under the catalysis of Lewis acid WO3/ZrO2 was investigated.
Vapor-Phase Elemental Mercury Adsorption by Novel Modified Vermiculite Adsorbents Impregnated with Different Agents
Authors: Ma Li Ping , Liu Jing Ping , Wang Jian Ying , He Ke Diao , Cui Xia
Published: July 2011

The novel modified vermiculite adsorbents have been made impregnated with sulfate, HCl and CuCl2. A laboratory-scale packed-bed reactor system was used to screen these adsorbents for their capability to remove elemental mercury. The affection of temperature on adsorption was also detected. Results showed that the adsorption capability for elemental mercury was improved after treated by different modified agents than the natural vermiculite. Comparing with active carbon, the adsorption capability of vermiculite adsorbents modified by sulfate and HCl were less improved, and it is almost increased 40 times than that of active carbon when using the CuCl2 modified vermiculite adsorbent at the same condition. Increasing temperature is active for the adsorption capability for elemental mercury by sulfate and HCl modified vermiculite adsorbents.
Solar Photocatalytic Degradation of MCRR by Ag-Doped TiO2 Films
Authors: Chen Xiao Guo , Yan Rui Ting , Wu Xiao Yan , Hu Yue
Published: July 2011

The photocatalytic degradation of MCRR has been investigated using Ag-doped TiO2 films as photocatalyst and sunlight as irradiation source. Ag-doped TiO2 films can significantly accelerate the degradation of MCRR both in distilled water and in lake water, although the efficiency in lake water was not good as in distilled water. The photocatalytic activity was affected by the number of coating cycles and the best performance was found in films prepared with five coatings. Solution pH can also significantly influence the photocatalytic degradation of MCRR, and acidic pH was more efficient for the degradation of MCRR.
Effects of Different Structural Systems on Lateral Rigidity of Steel Structural Frames
Authors: Yang Wei Guo , Li Xing Po
Published: July 2011

To understand the effect of filler walls on lateral rigidity of steel frame, Some methods such as theoretical analysis, finite elements calculation and experiment study were carried out to do research on the resistant-lateral effectiveness and the steel consumption of the three different structural systems, namely steel frame, frame-bracing and frame-board. The results show that the frame-board system can improve the structural lateral rigidity effectively, and will enhance the structural fundamental natural frequency sharply as well as reducing the structural steel consumption. It is an effective method for improving structural lateral rigidity to utilize the frame filled with wall panel. Making fully use of lateral rigidity of the wall panel can reduce the size of beam and column cross-section, material consumption and project cost.
The Seismic Damage Characteristic and Mechanism Analysis of Building Structure in Wenchuan Earthquake
Authors: Wang Yu , Yao Yong , Cheng Bin , Wang Lin
Published: July 2011

In the paper, the seismic damage information of six kinds of buildings, including Brick and concrete structure, the bottom frame brick and concrete structure, frame construction, Big span structure, special structure, farmhouse, were collected. Based on the architecture type, damage degree, height of house, the seismic damage information were statistic analysis in the damage characteristic of the structure. And on the basis of the damage characteristic, the dynamic response and earthquake resistance mechanism were studied. The correlation among site feature, structure type, strength of materials, construction technology and the seismic damage of structure were discussed.
In-Plane Force Effect of Reinforced Concrete Beam with Elastic Supports
Authors: Guo Zhi Kun , Chen Wan Xiang , Wang Qi Fan , Huang Yu , Li Chao Pu , Xu Xiao Zhuang
Published: July 2011

The bearing capacities of one-way reinforced concrete beams with elastic supports are investigated in this paper. According to the nonlinear characteristics of the beams, the basic equations based on plastic theory of concrete are derived by considering the in-plane force effects that aroused by the constraints of supports when the beams deforming. It is indicated that the calculation results are in good agreement with experimental datum, and the influences of different supports on the bearing capacities of the beams are quantitatively given for the first time.
Coincident Work between Upper Steel Structure and Lower Concrete Structure of Ningxia Flower Art Center
Authors: Yang Wei Guo , Gu Peng
Published: July 2011

In order to investigate the joint work pattern of upper steel part and lower supporting concrete part，the example of Ningxia flower art center was adopted to create finite element models for upper steel structure only and steel-concrete structure. And a further analysis for the models was done in terms of statistic analysis、elastic analysis under frequently occurred earthquake and dynamic elastic-plastic time-history analysis under seldom occurred earthquake. Besides, the influence of concrete structure’s elastic-plastic property to the whole structure under seldom occurred earthquake was discussed. The results show that structure response such as displacement and internal force increase considerably under joint work pattern. Moreover，the magnification effect of the lower structure about seismic load can not be ignored when designing and analyzing. And the structure’s seismic response will decline if we take into account the lower concrete's elastoplasticity under seldom occurred earthquake.
Effect of Quenched Speed on Microwave Properties of the NdFeB Nanocomposites
Authors: Xie Guo Zhi , Song Xiao Long , Zhang Bao Shan , Tang Dong Ming , Chen Jiang Wei , Bian Qing , Lu Huai Xian
Published: July 2011

The effect of the quenched speed on the microstructure and electromagnetic properties of melt spun Nd3Fe68Co18B11 nanocomposites was investigated. XRD spectra showed that only α-Fe phase can be obtained for both quenched samples. The complex permeability () and permittivity () within 2-18GHz were measured by vector network analysis. By virtue of quenched speed increased, the flake-like Nd3Fe68Co18B11 decreased the value of permittivity while that of permeability slightly changed. According to transmission line theory, the reflection loss was calculated. With thin matching thickness of 1.5mm, The Nd3Fe68Co18B11 composites realized the optimum reflection loss RL=-5.3dB at 3.6GHz and RL=-3.5dB at 3.9GHz for quenched speed 30m/s and 20m/s, respectively. It showed that it is possible to obtain good microwave absorbing properties with appreciated quenched speed for as spun Nd-Fe-B nanocomposites.
Enhanced the Insulin Secretion of HIT-T15 Cells by Hyaluronic Acid-Coating Involves Cytosolic Free [Ca2+]i Response
Authors: Li Yu Ping , Gu Bing , Pi Xiao Fang , Gong Yan Chun , Xiong Xiang Yuan , Wu Guang Jie , Li Zi Ling
Published: July 2011

Hyaluronic acid (HA) is an extremely ubiquitous polysaccharide of extracellular matrix in body and plays various biological roles. In this study, cell viability, insulin secretion and cytosolic free Ca2+ concentration were investigated in HIT-T15 cells after HA-treatment. The cell viability was determined by the MTT assay while the insulin secretion was detected by ELISA technique. The Flou-3/AM was applied to probe intracellular free calcium concentration. HA (0.25, 0.5, 1.0 mg/dish) increase insulin secretion in the 3 or 25 mM glucose-stimulation for 4 h. Cytosolic Ca2+ fluorescent intensity in HA-treatment groups (0.25, 0.5, 1.0 mg/dish) is significantly higher than that in control group. This study implied that the increasing of insulin secretion of HIT-T15 cells by HA-coating result from the enhancement of cytosolic Ca2+. And these data also provide some information on design biocompatibility when HA used as a biomaterial for bioartificial pancreas.
Preparation and Properties of Fluoride-Coated Mg-Zn-Zr Alloy for Biodegradable Intravascular Stents
Authors: Ye Xin Yu , Chen Min Fang , Liu De Bao , Yang Meng , Wei Jun
Published: July 2011

In order to improve the corrosion resistance, the samples made of Mg-Zn-Zr alloy were immersed in 20% or 40% hydrofluoric acid (HF) aqueous solutions for different intervals to prepare magnesium fluoride (MgF2) coating on the surface. By comparing the surface morphologies, the samples immersed in 20% HF solution for 6 h on which fine particles in nanoscale covered was selected for the further study. Immersion and electrochemical tests showed that the dense MgF2 coating would improve the corrosion resistance of Mg-Zn-Zr alloy. The corrosion current density (icorr) decreased from 2.10 μA·cm-2 to 0.05 μA·cm-2. The influence of HF treatment on the cytocompatibility was evaluated in vitro. There were significant differences in the cell number between the naked and coated samples after culturing for 3 and 5 days (p<0.05). All the results demonstrate that HF treatment is a promising approach to improve the corrosion resistance and in vitro biocompatibility of Mg-Zn-Zr alloy used as intravascular stents.
Extraction of Polysaccharides from Cordyceps militaris by Ethanol Refluxing Method
Authors: Gao Feng , Yu Ya Li , Chen Yu Jiang
Published: July 2011

The extraction of polysaccharides from cordyceps militaris by ethanol refluxing method was studied and the effected of solvent, solid-liquid ratio and time on the yields of polysaccharides were investigated and optimized conditions were determined through L9(34) orthogonal test at the same time. The yield of validate experiment was 33.50 % and the combination was 50 % ethanol + 1:15(g/ml) solid-liquid ratio + 7 h extraction time.
Effect of Polyethylene Jacket on Swelling Behavior and Mechanical Properties of PVA Hydrogel Nucleus Pulposus Prosthesis
Authors: Gao Jin , Zhu Wei , Zhou Xian , Li Xiao Gang
Published: July 2011

New prosthetic nucleus which consisted of ultrahigh molecular weight polyethylene (UHMWPE) jacket and polyvinyl alcohol (PVA) hydrogel core was prepared and studied. The hydrogels with similar size were encased in polyethylene jacket of different dimension. Studies indicate that with the decrease of jacket dimension, swelling time of prosthetic nucleus increases, the equilibrium water content and volume change ratio decrease. Differential Scanning Caborimetry (DSC) analysis shows that increasing the jacket dimension results in a slight increase of non-freezable bond water and significant increase in free water. The prosthetic nucleus with larger jacket has better stress relaxation property due to the plasticization of non-freezable water. These results suggest that the dimension ratio of jacket to core at 1.19-1.35 is the most suitable for artificial nucleus pulposus
Electronic Binding Energy Changes of Elements in Al2O3-MgAlON Composite during the Crack Healing Process
Authors: Yang Dao Yuan , Yuan Hui Yu , Qian Fen Ling , Wei Guang Hui , Zhu Kai , Wu Juan , Liu Jing Wei
Published: July 2011

Using Al, MgO and Al2O3 as raw materials, Al2O3-MgAlON composite was synthesized in N2 atmosphere by hot-press sintering at 900°C. Cracks prepared on the sample surface were healed at 1200°C×6hrs. Phase composition and element chemical state of sample were studied before and after healing. The results showed that: after healing process Al and MgO phase disappeare, and AlN and MgAlON phase appear, all kinds of elements in Al2O3-MgAlON material change their chemical state after the healing treatment, the changed electronic binding energy is Al 0.05ev, Mg 0.08ev, O 2.58ev or N 1.02ev respectively, and the chemical composition and crystal structure of MgAlON phase also change, all these change are helpful for crack healing process of Al2O3-MgAlON material.
Synthesis and Characterization of Biodegradable Segmented Liquid Crystalline Poly(Ester-Urethane)s
Authors: Du Jie , Cao Xian Ying
Published: July 2011

A series of biodegradable segmented liquid crystalline poly(ester-urethane)s were prepared by solution polymerization of poly(butylene succinate) (PBS), mesogenic diol prepolymer poly(butylene terephthaloyldioxy dibenzoates) (MD), and hexamethylene diisocyanate (HDI). The MD content was varied from 0 to 40 mol% so that the effects of the mesogen content on the thermal and physical properties, hydrolytic degradation and morphological textures were examined respectively. It was found that introducing mesogens units could increase the thermal stability and the elastic properties, while reduced the phase transition temperatures and the hydrolytic degradation rate. The mesogenic monomer and mesogenic diol could exhibit a schlieren texture characteristic of nematics, and some of the poly(ester-urethane)s could display a grainy texture.