bluuebunny/crossref_metadata_2025 huggingface dataset:
Realization of a Wideband Microwave Noise Filter Used Magnetic Multilayer Thin Films by Using Exchange Bais Stacks Structure
Authors: Jin Li Chuan , Zhang Huai Wu , Tang Xiao Li , Lu Guang Duo , Zhong Zhi Yong
Published: September 2011

The microwave magnetic dynamic properties of the [NiFe(40nm)/IrMn(15nm)]6/[NiFe(30nm)/IrMn(15nm)]7/[NiFe(20nm)/IrMn(15nm)]10 multi-stacks structure films, prepared by high vacuum DC magnetron sputtering deposition, have been investigated at the frequency range from 10 MHz to 6 GHz. By changing the thickness of the ferromagnetic (FM) NiFe layer in bottom [NiFe(t nm)/IrMn(15nm)]6 stack part, a tunable lower frequency range used magnetic multilayer can be realized. The influence of the NiFe layer thickness in bottom stack to static and dynamic magnetic properties were obtained and analyzed. Combining with the top [NiFe(30nm)/IrMn(15nm)]7/[NiFe(20nm)/IrMn(15nm)]10 two stacks used in the higher frequency, a kind of multi-stacks structure magnetic thin films were fabricated for the wideband microwave noise filter.
Study on the Polyol Synthesis of LiFePO4 for Lithium Ion Batteries
Authors: Wen Jia Jie , Guo Xiao Dong , Zhong Ben He , Liu Heng , Fang Wei Mao , Tang Yan , Tang Hong
Published: September 2011

The LiFePO4nanoparticles with high crystallinity were prepared using polyol process without any further heating as a post step, which will greatly economize in time and energy comparing with other conventional synthesis method. The temperature of the polyol solution was rapidly increased up to 550 K and maintained for 24 h in a round-bottomed flask attached to refluxing condenser to obtain nanoparticles. The X-ray diffraction (XRD) pattern was indexed on the basis of orthorhombic olivine-type structure without any unwanted second phase. The scanning electron microscopy (SEM) images of the samples showed the needled and flaky shapes of particles with uniform size in the range of 50-250 nm. It is noted that the nanoparticle was in favor of shortening the diffusion path to improve electrochemical performance. A reversible specific capacity around 160 mAh·g-1at 0.1C rate was achieved without capacity fading during the 20 cycles.
Application of Magnetite Mill Tailings and Solvay Distiller Waste in Foamed Concrete In Situ
Authors: Cai Ji Wei , Lü Zheng Hang , Hou Gui Xiang , Bai Rui Ying , Liu Man Man
Published: September 2011

It is in great request to substitute foamed concrete for organic thermal insulating materials that are inflammable and liberate virulent gases on burning. In current study, felsite powder (powdery magnetite mill tailings) was used as filler and Solvay distiller waste (DW) was used as hardening accelerator for foamed concrete. The results showed that the strength and strength-to-density ratio of foamed concrete in cement-felsite powder system is much higher than those in cement-sand system and cement-lime-sand system. The Solvay distiller waste, suspending agent and polypropylene fiber can improve performances of foamed concrete such as cohesion and strength. DW can reduce shrinkage in forming process of foamed concrete.
Inserting the GS1 to HACCP System to Guarantee the Food Safety
Authors: Zhao Lu Ying , Xia Ming , Guan Jing Jing
Published: September 2011

Hazard Analysis & Critical Control Points (HACCP) is the core component of the food safety management system which analyzes and controls biological, chemical, and physical hazards of food at each key point of food chain, namely from raw material production, procurement and handling, to manufacturing, distribution and consumption of the finished product [1]. However, the information of each point of HACCP does not connect. To bridge the gaps among points of food chain, GS1 system needs to be integrated into the HACCP system.
Preparation and Application of Talc-Fiber Composite Fillers in Paper-Making
Authors: Yao Xiao Hong , Xue Guo Xin , Guo Xing
Published: September 2011

A kind of composite filler was prepared by using talc, 85。SR softwood pulp and CPAM. The effects of talc-fiber composite fillers on paper were investigated. The results showed that the composite fillers mainly adsorbed onto the surface of external fibrillatioed fibrils. Compared with commercial talc, the paper wih composite fillers addition had higher tensile index. It also showed that the composite fillers had some negative influence on drainage effect, when compared with the blank samples. Composite fillers which were prepared at CPAM dosage 0.6% had better effects on preparation of high filler paper.
Experimental Application of Salt Slurry in Zhongyuan High Density Polymer Saturated Brine-Based Drilling Fluid
Authors: Zhou Li Ju , Feng Jia Man , Lei Jin Jie , Yuan Jun Wen
Published: September 2011

Salt slurry is the solid waste of the salt industry. The study object is the salt slurry in Jianghan Salt & Chemical Complex. This study investigates the application of the salt slurry in high density polymer saturated brine-based drilling fluid. This laboratory study indicates that the salt slurry may improve the rheology behavior of the drilling fluid, and may measure up both the API and the HTHP filtrate loss. On the premise of the same density and pH value as the basic drilling fluid recipe, with the increasing of the salt slurry, the YP/PV value increased, but the friction coefficient of the mud-cake increased. This investigate will reduce the cost of the high density polymer saturated brine-based drilling fluid with the salt slurry as a resource, and will have important significance for both recycling economy and the cleaner production of the salt industry.
Study of EDLC and its Usage in Stand-Alone Photovoltaic System
Authors: Li Bao Hua , Pan Xue Song , He Yan Bing , Du Hong Da
Published: September 2011

In recent years, Electric Double Layer Capacitors (EDLCs) are gradually accepted by people and used in different areas as storage devices. This paper studied the working mechanism of EDLC and discussed two kinds of models of EDLC. Based on the advantages of EDLC, this paper proposed EDLC-battery combine storage system in stand-alone photovoltaic system and designed Energy Control System (ECS). Test results show that the hybrid storage system can collect more energy generated by solar panels, enhance the power output ability of energy storage system and extend battery’s life.
The Role of CdS Buffer Layer in ZnO Nanowire Arrays/SnS Thin Film Solar Cells
Authors: Hu Zhe , Yang Wei Guang , Liu Sheng , Tang Ke , Wang Lin Jun , Shi Wei Min
Published: September 2011

SnS is a promising p-type semiconductor material for low-cost and low-toxic solar cells due to its exciting properties, such as high absorption in the visible range, little toxicity, inexpensiveness, and so on. The CdS nano-layer used as buffer layer of ZnO nanowire arrays/CdS/SnS thin film solar cells was prepared by thermal evaporation method. X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), atomic force microscopy (AFM), UV-Vis spectra, Hall effect measurement system and I-V measurement system were used to characterize the ZnO nanowire arrays/CdS/SnS thin film solar cells. It is found that the CdS nano-layer plays a key role in reducing the leakage current.
Investigation of Thermal Insulation Materials Based on Easy Renewable Row Materials from Agriculture
Authors: Zach Jiri , Peterková Jitka , Petranek Vít , Kosíková Jana , Korjenic Azra
Published: September 2011

Production of building materials is mostly energy consuming. In the sphere of insulation materials we mostly see rock wool based materials or foam-plastic materials whose production process is demanding from material aspect and raw materials aspect as well. At present the demand for thermal insulation materials has been growing globally. The thermal insulation materials form integral part of all constructions in civil engineering. The materials mainly fulfill the thermal insulating functions and also the sound-insulating one. The majority of thermal insulation materials are able to fulfill both of the functions simultaneously. The paper describes questions of thermal insulation materials development with good sound properties based on natural fibres that represent a quickly renewable source of raw materials coming from agriculture. The main advantage of the materials are mainly the local availability and simple renewability of the raw materials. In addition an easy recycling of the materials after their service life end in the building construction and last but not least also the connection of human friendly properties of organic materials with advanced product manufacture qualities of modern insulation materials.
Tribological Properties of Aluminum Alloy Coating Deposited on Magnesium Alloy Surface by Cold Spray
Authors: Zhu Sheng , Han Guo Feng , Wang Xiao Ming , Du Wen Bo
Published: September 2011

In this study, Al-Si alloy protective coating was deposited on the surface of ZM5 magnesium alloy by cold spray technology. Researchers observed the surface morphology of the coating by SEM, and researched tribological properties of the substrate material and the coating. The results show that, the bonding mechanism of the Al-Si alloy coating and substrate is metallurgical bonding and mechanical interlocking. The abrasion mechanism of Al-Si alloy coating is adhesive wear. The friction coefficient of the coating is higher than magnesium alloy in different friction frequencies. Greater change in friction coefficient is caused by the inhomogeneous phase composition. But the wear track depth of the coating is smaller than magnesium alloy. Wear-resisting property is improved.
Effect of Aspect Ratio of Micro Sphere Lens Arrays on the Optical Property of Diffuser
Authors: He Xiao Xiang , Zheng Xiu Ting , Wu Da Ming , Zhang Ya Jun , Zhuang Jian , Zhou Yang
Published: September 2011

The effect of the aspect ratio of micro sphere lens arrays on the optical properties of diffuser including transmittance and haze have been simulated by the LightTools software, and the results show that with the increasing of the aspect ratio, the haze rises first and drops later while the transmittance decreases all the time. Later, the mold with uniform micro sphere lens arrays arranged in regular triangle has been fabricated successfully by the ball embossing method. Then, the micro sphere lens arrays diffuser with aspect ratio of 0.19, 0.23, 0.26 and 0.29 have been made using the hot embossing method in polypropylene (PP) substrate. Last, haze and transmittance of the micro sphere lens arrays PP diffuser made are verified both by experiment and simulation and the results of experiment and simulation are consistent well.
Research on Controllable Effects of HI Ultrasonic Radiation to Active Composition in Hippophae
Authors: Wang Bao Qiang , Yang Liang Liang
Published: September 2011

The controllable cavitation effects of high intensity ultrasound are introduced. The effects are used for active component extraction of biomaterials. The research aims: combining with extraction of the total flavones from hippophoe leaves, the effects to chemical structure of active components with HI ultrasonic radiation are deeply explored. The research contents: ①the reaction mechanism of HI ultrasound to plants and ②the effects of cavitation to active composition of hippophae will be discussed. The research methods: ①through the theory and experiment research, the characters of HI ultrasonic energy ere introduced, and then ②the chemical structures of total flavones from Hippophoe leaves extracted with ultrasound are tested by means of HPLC. The results: ①the characters of ultrasonic energy could be controlled and ②at the reasonable conditions, the active ingredients of plant medicine will not be destroyed by ultrasound.
Photocatalytic Activities of Mo Ions Implanted TiO2 Thin Films
Authors: Zheng Shu Kai
Published: September 2011

Transparent TiO2 thin films were deposited onto microscope glass slides by means of d.c. magnetron sputtering method. In order to enhance the photocatalytic activity of TiO2 thin films, Mo ions with different nominal doses were implanted into the TiO2 thin films. The samples were characterized by different technologies including X-ray diffraction (XRD), X-ray photoelectron spectroscope (XPS) and UV-VIS-NIR spectrophotometer. The photodegradation results of methylene blue dye solution indicated that optimal dose of 2×1012ions/cm2 Mo ion-implantation resulted in a higher photocatalytic activity in the implanted TiO2 thin films.
Preparation and Properties of Polytriphenylamine/Multi-Walled Carbon Nanotube Composite as a Cathode Material for Li-Ion Batteries
Authors: Su Chang , Ye Yin Peng , Bu Xi Dan , Xu Li Huan , Zhang Cheng
Published: September 2011

A composite of polytriphenylamine (PTPAn) and multiwalled carbon nanotube (CNT) was prepared and tested as a cathode material in the Li-ion battery. To research the crucial role and effect of CNT in the above composite electrode, a comparing cathode of PTPAn mechanically mixed with super-p carbon was prepared and tested in the similar Li-ion batteries. The results indicate that due to good resiliency and loosing structure of the composite, PTPAn/CNT composite cathode exhibits lower charge transfer resistance (Rct), higher discharge capacity and cycle stability than those of PTPAn+super-p electrode.
The Mechanical Characteristics of Straw/poly(Lactic Acid) Composite Materials
Authors: Wu Xue Li , Qiu Jian Hui , Lei Lin , Zhao Yang , Sakai Eiichi
Published: September 2011

To consider the effective utilization of plastics and agricultural wastes, rice straw fibre was extracted from agricultural wastes, and then composited with polylactic acid(PLA). The thermal stability of straw/poly(lactic acid)(straw/PLA) composites decreased (Thermogravimetric Analysis, TGA). Tensile strength, fracture strain and sharply impact strength of straw/PLA were decreased with the increase of filler content and grain size of straw. Yong’s modulus were increased as the increasing of straw content.
The Preparation Method of Solid Electrolyte Lanthanum Fluoride Powder
Authors: Han Yuan Shan , Zhang Qin , Fang San Feng , Wang Chang Zhen
Published: September 2011

LaF3 powder is prepared by means of three methods . The traditional precipitation of LaC13 with HF action, sol-gel of La (CH3COO) 3 with NH4F action then gel is handled by infrared furnace and microwave method of La (CO3)3 as La source with NH4F action to become LaF3 Ultra-fine powder under the action of microwave. Through the SEM photographs, it can be revealed that the powder particles are different. Precipitation particles diameter is 10 μm; sol-gel method of particle is 1 um and there are a lot of needle-like particles; microwave particles is 100nm.
Reaction Sintering of Carbon Fiber Reinforced Silicon Carbide Composite by Gel-Casting Method with Water Soluble Epoxy Resin as Gel Former
Authors: Wei Jing , Fang Jing Zhong , Zhang Ai Fang
Published: September 2011

Reaction-bonding sintering silicon carbide (RB-SiC) toughened by 10vol% short carbon fibers were produced by Gel-casting method using water soluble epoxy as gel former and then reaction sintering at 1750°C under vacuum atmosphere for 2 h . SEM showed that short carbon fibers could disperse uniformly in the preforms and sintered carbon fiber reinforced silicon carbide composites (Cf/SiC). The mechanical test results showed that the strength decrease from 286 MPa for RB-SiC to 231 MPa for Cf/SiC, however, the fracture toughness of Cf/SiC increased from 3.65 MPa m1/2 to 5.28 MPa m1/2 compared with RB-SiC. The strength decrease of the Cf/SiC should be ascribed to the chemical reaction between the addition of short fibers and matrix, and the increase of the fracture toughness could be attributed to fiber debonding, fiber pull-out and crack deflection .
An Experiment Study on the Moisture Absorption and Desorption Characteristic of Humidity-Controlled Composite Building Blocks in Greenhouse
Authors: Wei Feng Lan , Li Chun Long , Liu E , Zhang Cai Bei
Published: September 2011

The moisture absorption characteristic of the humidity-controlled materials at different relative humidity was studied by experiment and the moisture equilibrium content under different humidity condition was obtained. At the same time, the humidity-controlled composite building blocks in greenhouse were successfully developed. The experiment of the humidity-controlled composite building blocks shows that the humidity-controlled composite building blocks can realize the humidity control without the high power consumption, operation inconvenience or polluted the environment etc. compared with the traditional dehumidification method. The humidity-controlled composite building blocks in greenhouse have the very good application prospects.
Preparation and Characterization of ZrO2/CNTs by Hydrthermal Method
Authors: Zheng Yu Ying , Ji Wen Jun , Li Jun , Huang Hui Min , Sun Ming
Published: September 2011

Nano-compounds of ZrO2/CNTs were prepared by hydrothermal method. The ZrO2/CNTs nano-compounds were characterizated by XRD, TEM, BET and Zeta potentials. The results showed that perfect hydrothermal temperature was 180°C, hydrothermal time was 11h, pH was 9.5. It is showed by the analysis of TEM and Zeta potential, adding surfacant CTBA, the surface of nano-tube and Zr(OH)4colloids take different charge, and they adsorpt each other. And ZrO2particles were successfully coated on the CNTs in surface-active agent of CTBA.
Researches on the Strength of Composite Material Barrels Based on Continuum Damage Mechanics
Authors: Wu Qi Jun , Zhou Ke Dong , He Lei
Published: September 2011

To research the strength of composite material barrels, based on the CDM theory, an energy-based stiffness degradation method is proposed to predict the progressive failure properties of steel- fiberglass/ epoxy composite laminated barrels. Three failure modes of fiberglass/ epoxy composites, including fiber breakage, matrix cracking and fiber/matrix interface shear failure are considered in the present model. A 3D finite element technique including the multiframe restart analysis is employed to conduct the progressive failure analysis. The results indicate that the mode considering the stiffness degradation and progressive failure of the material is more reasonable on researching the strength of composite material barrels. The strength of composite material barrels in this paper is influenced by the fiber strength mainly.
Preparation and Properties of Antistatic SMS Composite Nonwovens
Authors: Kang Wei Min , Yan Jing , Cheng Bo Wen
Published: September 2011

A kind of SMS composite nonwovens with excellent antistatic property was developed by mixing the polypropylene resin and the antistatic agent. Mechanical property, air permeability, drapability and antistatic property of the products at different antistatic agent content were analysed. The results show that the antistatic property of SMS composite nonwovens was improved significantly by blending antistatic agent, Although the mechanical property, drapability and permeability is deceased slightly.
Influence of AC Driving Current on Magneto-Impedance Effect in Glass-Covered Co-Based Microwire
Authors: Tian Bin , Shi Hua
Published: September 2011

The influence of ac driving current on the frequency dependence in the range from 0.1 to 20 MHz of the giant magnetoimpedance effect (GMI) of glass-covered amorphous microwires were investigated. The dependence of GMI for a range of values of ac current (from 0.5 mA to 20 mA) flowing along the microwire has been measured in as-prepared samples. The double-peak feature is changed to the single-peak festure and the magnetic field at which the value of GMI reaches a maximum should increase with the higher the amplitude of the ac at low frequency. It was found that the change of GMI related to circular coercivity.
Study on Using Numerical Method to Predict Wear Volume of Rail
Authors: Wang Cai Yun , Shen Peng , Liu Qi Yue
Published: September 2011

This paper describes an numerical method and simulation experiment investigation on the rail wear affected by the curve radius and axle load etc. the effects of curve radius and axle load on The effects of axle load and curve radius on total slippage of contact particles and friction work of wheel/rail are investigated with numerical methods are analyzed by kalker’s program CONTACT. The effect of curve radius and axle load on rolling wear behaviour of rail is investigated by simulation experiment. It is indicated that axle load and curve radius are important factors to effect rolling contact wear of wheel-rail, and there is a linear relationship between wear volume of rail and friction work of wheel/rail; The preliminary empirical formula between wear volume of rail sample and friction work is given by analysis the experimental and calculation results, the formula offers a certain reference value for researching wear of wheel-rail and predicting wear volume of rail.
Anodic Oxidized Titania Nanotubes as Drug Delivery
Authors: Mao Dan , Xiao Xiu Feng , Wang Chun Yan , Tang Hai Zhen , Liu Rong Fang
Published: September 2011

TiO2 nanotube arrays were fabricated by anodic oxidation in electrolytes containing F- in this paper. To achieve local drug delivery, anodized titanium with nanotube layer structures were loaded with ibuprofen(IBU) using a vacuum drying method in which drug molecules were tiled on the anodized titanium to dry in vacuum drying oven. The morphology and phase of TiO2nanotube were characterized by means of FE-SEM, XRD, FIRT, respectively. Results indicated IBU were loaded on titania nanotube (220nm inner diameter and 7.3μm deep) layer successfully. But the IBU loading on anatase is more than on amorphism. And different phases with drug loading have the same release process, which was divided into quick release and stable release. Quick release processes about Anatase/IBU are fitted with different equations. We found that the experimental data fit the theoretical first-order curve the best. It suggested that the drug carrier had the properties of sustained release.
Crystallization Properties of Polypropene/Graphene Oxide Nanocomposites
Authors: Ying Zong Rong , Dang Zhi Min , Yan Xiao Hui , Ouyang Xiu , Gao Yan Ying
Published: September 2011

Polypropene (PP)/graphite oxide (GO) nanocomposite was prepared via solution blending and studied by adopting polarized optical microscopy observations, X-ray diffraction analysis and differential scanning calorimetry analysis. It is found that GO acts as an effective heterogeneous nucleation agent. The addition of GO doesn’t change the crystalline structure of PP, but leads to the decrease of spherulite dimension. GO makes the temperature of the crystallization exothermic peak increase, the crystallization temperature range and the half width of the crystallization peak narrow.
A New Test Setup for Experimental Test of RC Beams under Combined Shear and Torsion
Authors: Talaeitaba Sayed Behzad , Mostofinejad Davood
Published: September 2011

Studying the RC beams’ behavior, when they are exposed to combined shear and torsion is one of the most important problems in civil engineering which has been going on for half a century. In this study, to build a suitable set up and to load the beams properly, is of special importance when an area of little bending as the test area is needed in the pure shear and torsion test. In this investigation, based on the primary principle of structure analysis and fixed support, a setup is developed and its efficiency has been evaluated. Also this support system has been tested for five RC beams under the eccentricity of zero (pure shear) to extreme (pure torsion) and its efficiency has been evaluated and confirmed through these five tests.
Coupling Grafting Modification of Nano-ZnO Using N,N’-Carbonyldiiimidazole as Activator
Authors: Chen Heng Zhi , Jia Ling Ling
Published: September 2011

For satisfying the dispersion and compatibility of nano-ZnO particles in organ medium, stearic acid (SA) which was activated by N, N’-carbonyldiiimidazole (CDI) was grafted onto the surface of ZnO nanoparticles prefunctionalized with aminopropyltriethoxysilane (APS). The results showed that the grafting reaction of SA on the nanoparticles had occurred successfully through the intermediate of carbonyl imidazole obtained by reacting between CDI and the stearic acid, and the amount of stearic acid grafting on the nano-ZnO with CDI was much more than that on the nano-ZnO particles without CDI.
Injury on Blood Systems Caused by Silicon Dioxide Nanoparticles
Authors: Huang Zhe Wei , Sun Jiao , Shi Li Yi , Zhang Da Wei
Published: September 2011

Nano-sized silicon dioxide (SiO2) is widely utilized in artificial bone, artificial tooth, interventional catheters and drug delivery system，so it is imperative to study SiO2 NPs on the role of the body damage. Consulted with standard reference of GB/T16886, 20 and 80 nm SiO2 NPs were selected to prepare suspension (1mg/ml) for subacute systemic toxicity; 2000mg/ml suspension for MTT; and extracts (0.1g/ml) for hemolytic test. The results show that the hemolysis rate are all more than 5%, after its continuous injection of 2W nanoparticles into SD rats and New Zealand Rabbits, the alterations on the hemoglobin, hematocrit, mean corpuscular volume and other indicators have gained in blood routine test, and there was a marked inhibition on the L929 cells of SiO2 NPs. Therefore, these two kinds of particle size of SiO2 NPs have certain extent of injury effect on the blood system, and the contact time of NPs in the blood compatibility evaluation has play a more important role than the others.
Controlling Aspect Ratio of Copper Group Nanowire Arrays by Electrochemical Deposition in the Nanopores of AAO
Authors: Sun Xiu Yu , Xu Fa Qiang
Published: September 2011

Highly ordered Cu, Ag and Au nanowire arrays with high aspect ratio and highly dense self-supporting nanowire patterns of copper group were successfully prepared using cyclic voltammetry with the assistance of anodic aluminum oxide (AAO) template. The X-ray diffraction (XRD) patterns of the metal nanowries were indexed to the face-centered cubic structure. The field emission scanning electron microscope (FE-SEM) results demonstrated that the length of nanowire could be controlled by changing the electrodepositon conditions. The aspect ratio of nanowire arrays can be tuned.
Preparation of Nano-CuS by Phase-Transfer Method and its Application to CuS Modified Electrode
Authors: Xu Chao , Zhang Xiao Hui , Zhang Jun , Yin Hong Zong
Published: September 2011

Homogeneous nano-CuS were synthesized by phase-transfer method, and the preparatory conditions were studied in detail. The synthesized nano-CuS was characterized by transmission electron microscopy (TEM) and UV–vis absorption spectroscopy. The results indicated that the as-prepared nano-CuS showed a willow-like structure with average diameter of 30-40 nm. Then a novel carbon paste electrode (CPE) based on these nano-CuS was prepared, and its chemical characteristics were researched. The modified CPE based on nano-CuS was used to detect of H2O2, and a satisfactory result was achieved.
Study on Properties and Cross-Linking Structure of NR Dried by Microwave
Authors: Wang Yong Zhou , Zhang Fu Quan , Chen Mei , Lv Ming Zhe , Huang Hong Hai
Published: September 2011

In this work, the cross-linking density and frequency sweep, temperature sweep of NR dried by microwave were tested by using nuclear magnetic resonance spectrometer (NMR) and rubber process analyzer (RPA), respectively. And the test results were compared with those of NR dried by hot-air. The results showed that the cross-linking density and A(Mc) for NR dried by microwave were bigger than those for NR dried by hot-air, but the A(T2) of latter was bigger; the frequency sweep results showed that the elastic modulus of NR dried by hot-air increased slower with the increase of frequency than those of NR dried by microwave , and the tanδ of NR dried by hot-air decreased with the increase of frequency slower than those of NR dried by microwave in low frequency phase, respectively; the temperature sweep results showed that the elastic modulus of NR dried by hot air were smaller compared with those of NR dried by microwave in the entire scanning process, but, the tanδ value of former was bigger.
A Simple and Sufficient Method to Fabricate ZnO Nanowire Thin-Film Transistors
Authors: Dai Zhen Qing , Hui Bing , Zhang Ya Fei
Published: September 2011

Large-scale fabrication of ZnO nanowire (NW) based devices with a low cost process is a key issue in practical application. In this paper, we report a simple and sufficient self-assembly process to prepare highly dense, uniform ZnO NW films. In this process, the NWs are modified with the aminopropyltriethoxy silane (APTES) to form the positively charged amine-terminated layer, so they are adsorbed on negatively charged SiO2/Si substrates to form ZnO NW films by the electrostatic interaction in aqueous solution. Nanowire thin-film transistors (NW-TFTs) based on the prepared ZnO NW films are fabricated. A typical NW-TFT exhibited a current on/off ratio of 2.7×105, a transconductance of 546 nS and a field-effect mobility of 8.9 cm2/V•s. This study may pave the way toward large-scale fabrication of ZnO NW based devices with simple, sufficient and low cost process.
Effects of Hydrogen on Electrochemical Behaviors of X80 Steel in Simulated Soil Solution
Authors: He Chuan , Chen Xu , Xu Yang , Liu Zhi Yong
Published: September 2011

X80 pipeline steel specimens were treated by electrochemical hydrogen charging under various current density and charging time. The polarization resistance and corrosion rate of X80 steel were analyzed in Yingtan simulated soil solution under the different hydrogen charging conditions. The results showed that hydrogen accelerated anodic dissolution and enhanced corrosion sensitivity. With hydrogen in the steel, the charge transfer resistance and polarization resistance decreased, double electric layer capacitor and corrosion current increased. The effects were enhanced with the increase of hydrogen charging time and current density.
Corrosion Behavior of TP95S Anti-Sulfur Casing Steel in High Temperature High Pressure H2S/CO2 Environment
Authors: Wang Bin , Zhou Dong Mei , Bai Jiang Hu
Published: September 2011

The anti-corrosion performance of Tiangang TP95S casing steel was studied by high temperature autoclaves simulating the high-temperature and high-pressure H2S/CO2 environment. The experimental results show that the corrosion rates increase with the rising of temperature which is from 40°C to 80°C under the dynamic and static conditions of the simulated environments; the dynamic corrosion rates are between 1.7294 and 1.8601mm/a and the corrosion rates are 0.4264～1.2715mm/a under the static conditions, both of which belong to a serious corrosion category; the dynamic corrosion samples have had the localized corrosion at 40°C, but the local corrosion of the static corrosion specimens appeared at 80°C; the corrosion product of TP95S steel takes FeS as the core in the case of static corrosion at 40°C.
Preparation and Characterization of ZnO Nanowire Arrays Grown on Different ZnO Seed Layers by Hydrothermal Method
Authors: Liu Sheng , Yang Wei Guang , Hu Zhe , Wang Ya Li , Tang Ke , Wang Lin Jun , Shi Wei Min
Published: September 2011

Due to its suitable band gap, low cost, environmental friendliness, and high electron mobility, ZnO, naturally n-type semiconductor with a wide bandgap (Eg = 3.37 eV), is widely studied, as a window layer of heterojunction solar cells. In this study, the ZnO nanowire arrays were grown on the different ZnO seed layers by hydrothermal method. X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM) and UV-Vis spectra were used to characterize the ZnO nanowire arrays. The results indicate the seed layer can effect the size distribution, density, crystal structure and optical properties of the nanowire arrays.
Study on the Surface Quality of Fender NC Incremental Forming
Authors: Zhou Liu Ru
Published: September 2011

The NC incremental sheet metal forming technology is a flexible forming technology without dedicated forming dies. The forming locus of the forming tool can be adjusted by correcting the numerical model of the product. Because the deformation of sheet metal only occurs around the tool head and the deformed region is subjected to stretch deformation, the deformed region of sheet metal thins, and surface area increases. Sheet metal forming stepwise is to lead to the whole sheet metal deformation. The principle of NC incremental sheet metal forming and the forming process of the fender are introduced. The effect of process parameters on forming is analysed. The improvement method of the forming quality is suggested. The groove is created in the starting point of tool moving when the starting point of tool moving locus at all layers is identical. The groove can be eliminated when the starting point of tool moving locus at all layers is different. The feed pitch p increase, the process time decrease, production rate and surface degree of roughness increase. In general, the feed pitch is 0.25mm.
Simulation and Experiment of Dynamics of Flange Structure with Bolted Joint
Authors: Zeng Guo Ying , Zhao Deng Feng
Published: September 2011

The relationships between dynamics response and preload of bolted joint were studied. By using finite element analysis method, nonlinear model of flange structure with bolted joint was established. The transient analysis for different preload condition of bolted joint was employed to obtain steady state response. The energy of the difference signals between up and down mating surfaces was computed. The energy of the difference signals increased as preload of bolted joint decreased, and nonlinearity of bolted joint increased. The numerical results were compared with experimental measurements. The similarity was found to be satisfactory.
Analysis on the Influence of Vibration Performance of Air-Gap of Ceramic Motorized Spindle
Authors: Zhang Li Xiu , Wu Yu Hou , Wang Li Yan
Published: September 2011

Engineering ceramic is the ideal material for high-speed and high precision motorized spindle due to perfect characteristics of light weight, wear resistance, high temperature, high strength, and so on. The air-gap is changed due to the influence from various factors not only the tolerance of the manufacture and assembly of motorized spindle but also different working condition. The change of air-gap impacts on vibration performance of motorized spindle. The effects of rotating speed and air-gap between the rotator and stator on these characteristic parameters of the motorized spindle are analyzed. This paper analyses the effect change of air-gap on vibration performance of motorized spindle by the simulation analysis and experimental. The results show that vibration increase with the decrease of air-gap. Meanwhile, electromagnetic vibration increase with the increase of eccentricity of motorized spindle. These results are very helpful to the structure optimization and application of the ceramic motorized spindle.
Microstructure and Properties of Forging Engine Valve Seat
Authors: Huang Zhi De
Published: September 2011

Microstructure and properties of Forging high Cr cast iron were investigated according to the requirements for production and application of engine valve seat. It is found that the microstructure of Forging high Cr cast iron consists of tempering martensite, M7C3 carbide and austenite. The strength ,and plasticity and hardness of Forging high Cr cast iron after heat treating is higher than that of centrifugal casting high Cr cast iron. So the Forging high Cr cast iron can meet the application demand of the engine valve seat.
Research on the CAD / CAM Collaborative Mode Based on the IOT
Authors: Cao Li Jun
Published: September 2011

The Internet of Things need new business mode to developing. Under the booming manufacturing industry, modern IT technology is applied in traditional mechanical processing and manufacturing industry to relieve the talents shortage, and to improve production efficiency. According to the characteristics of CNC machinery, proposed an idea that to establish a CAD/CAM integrating services platform by equipment manufacturing enterprises. By taking full advantage of technology and human resources, offer services to equipment users to meet market demand. The mode uses advanced computer network technology, providing a new business model to the development of the internet of things, also, offering a new way for the upgrading of enterprise products.
Performance of Externally Pressurized Dry Gas Seal
Authors: Zhu Wei Bing , Zhou Sheng Ren , Wang He Shun
Published: September 2011

By adding the flow rate of throttle orifice to conventional stable externally pressurized gas lubrication equation, the Reynolds equation for externally pressurized dry gas seal with orifice compensation is established. The solution of the equation is studied by functional extremum algorithm and finite element method, and the computer numerical simulation is carried out in Matlab software. The effects of air supply pressure, numbers and diameter of throttle orifice, on face opening force and gas film stiffness are discussed in detail.
Study on the Precipitation Behavior of the Drill Pipe Steel Microalloyed with Nb
Authors: Xu Xin , Song Sheng Yin , Feng Yao Rong , Wang Xin Hu
Published: September 2011

A new drill pipe steel microalloyed with 0.04 w.t.% Nb was designed to meet the needs of drilling operation in super-deep wells, and the precipitation behavior of Nb during temper was studied in detail. The results show the austenitic grain can be refined by the addition of 0.04 w.t.% Nb, and the steel has a high yield strength of 1192MPa, high tensile strength of 1226MPa and high impact absorbing energy of 137J when the steel is quenched at 900°C and tempered at 550°C, moreover, the volume fraction and dimension of precipitates increases with increasing temper temperature. When the new steel is tempered at 550°C, the new steel has the best comprehensive performance due to the fine dispersed precipitates. The mechanical properties of the new steel are much better than that of the common drill pipe steel.
Effect of Gd2O3-Nd2O3 Compound Additive on Crystallization and Sintering of Fused Quartz Ceramic Materials
Authors: Wei Heng Yong , Liu Shu Long , Bu Jing Long , Shen Shu Bin , Yu Li Xue , Wang Zhi Fa
Published: September 2011

Fused quartz granules (d50=19 μm) were used as raw material, and Gd2O3-Nd2O3 (1:1, in mass) was used as additive with dosages of 1% (in mass, similarly hereinafter), 2% and 3%. Fused quartz ceramic materials were fabricated in reduction atmosphere at 1300 °C, 1350 °C and 1400 °C for 1 h. The apparent porosity, bending strength and thermal expansion ratios of the samples were examined and the samples were further analysed by means of XRD and SEM. The results showed that the sample sintered at each temperature with 3% Gd2O3-Nd2O3 had the lowest apparent porosity, the highest bending strength and more compact microstructure. This indicated that 3% Gd2O3-Nd2O3 was helpful to sintering of fused quartz ceramic materials. The results of XRD and thermal expansion ratio analysis showed that 3% Gd2O3-Nd2O3 compound additive had better effect on inhibiting crystallization of the samples sintered at 1300 °C and 1350 °C, but had a little effect on inhibiting crystallization of the sample sintered at 1400 °C.
Microstructure Simulation and Toughening Mechanism of Ceramic Tool Material
Authors: Zhu Xiao Hui , Huang Chuan Zhen , Liu Han Lian , Zou Bin , Zhu Hong Tao
Published: September 2011

Based on the microstructure results of Monte Carlo simulation, a three-dimensional grid model is built up, and imported into the finite element software with C++ language to analyze the mechanical properties of ceramic tool material. The stress field and residual stress of single-phase and multiphase ceramics have been analyzed by the computer simulation technology.
Preparation and Performance of Micro-Arc Oxidation Ceramic Coating of Titanium Alloy in Low Current Density
Authors: Xi Jian Jun , Zhao Jun , Niu Guo Jun
Published: September 2011

In this paper, Three types of electrolyte (phosphate, silicate, aluminum) are considered to make preparation for micro-arc oxidation coatings on titanium alloy by bipolar pulse MAO oxidation power with low power consumption (density of current less than 1A/dm2). Treated by micro-arc oxidation, dense micro-arc oxidation ceramic coating is formed on titanium alloy. Surface morphology and friction coefficient of MAO coating is analyzed. The research on the effect of NaF on ablation of MAO coating is prepared, which guides the configuration of the electrolyte later.
Fabrication and Mechanical Properties of Nano-Al2O3 Based Composite Ceramic Tool Material
Authors: Li Xing , Fang Bin , Xu Xiu Guo , Xu Chong Hai
Published: September 2011

The Al2O3(nm)/SiC（μm）/Al2O3（μm）ceramic tool materials were fabricated by the hot-pressing technique. Effect of the compositions on microstructure and mechanical properties is investigated. With nano-particles content decreasing, the flexural strength increased and fine grains can be obtained. When the nano-alumina content is 60wt%, the grain of this sample is fine, the Vickers hardness and flexural strength are 16.24 GPa and 678 MPa, respectively.
Variance Analysis from an Inter-Laboratory Comparison about Different Emission Test Methods by a Certified Green Building Material in Taiwan
Authors: Liao Ling Ya , Chiang Che Ming , Chen Chen Cheng
Published: September 2011

This paper utilizes a product certified by Green Building Material Label (TGBML) in Taiwan on comparing the benchmarks of emission, test methods and compounds with other green building material labels, especially focusing the analyte on HCHO and VOCs. On a statistical basis, we get the test values of 288 low-emission products certified by TGBML. The average emission rates of HCHO and VOCs are as follows: HCHO=0.0028 mg/m2*hr, and TVOC=0.0683 mg/m2*hr. (Benchmarks of low-emission product of TGBML are as follows: HCHO=0.08 mg/m2*hr, and TVOC=0.19 mg/m2*hr) This paper reveals that the product certified by Taiwan Green Building Material Label (TGBML) can pass the benchmarks of other 3 building material labels. In order to promote a healthy IEQ environment in Taiwan, these results may provide stricter low-emission benchmarks and suggestions of other compounds which can be added to the prerequisites of tests in Taiwan.
Preparation, Characterization and Properties of Ternary Blends with Epoxidized Natural Rubber, Poly (Lactic Acid) and Poly (Butylene Adipate-Co-Terephthalate)
Authors: Nampitch Tarinee , Magaraphan Rathanawan
Published: September 2011

The objective of this work was to study the production of new biodegradable thin films. As a result of increasing problems with regard to the disposal of domestic waste, particularly plastics, a new class of polymers especially designed to be biodegradable has been undergoing development. However these biodegradable plastics still have a limitation, i.e. high cost. This research studied methods of lowering the cost of biodegradable plastic and of improving its properties by using epoxidized natural rubber as a another polymer for polymer blends. Thus, ternary blends of epoxidized natural rubber (ENR), poly(lactic acid) (PLA) and poly(butylene adipate-co-terephthalate) (PBAT) were studied and prepared using a twin-screw extruder, followed by use of a chill roll cast film extruder or a blown film extruder, to produce biodegradable film. The concentration of ENR in the ternary blends was fixed at 10 wt%, with the remainder being PLA and PBAT. In some proportions of the film blends, Irganox and Uvinul were introduced to increase the thermal stabilization and UV stabilization, respectively. The mechanical and thermal properties were evaluated, including the thickness, color, and water vapor permeability (WVP) of the biodegradable films.
The Porous TiNb24Zr4 Alloys with Controllable Porosity Fabricated by Conventional Sintering
Authors: Li Yu Xuan , Cui Zhen Duo , Yang Xian Jin , Zhu Sheng Li
Published: September 2011

In the present study, porous titanium alloys were fabricated successfully by mixing titanium, niobium, and zirconium powder with pore-forming agent of ammonium bicarbonate via conventional sintering method. The pore characteristics, such as pore morphology and distribution, mean pore size and porosity of prepared porous TiNb24Zr4alloy were investigated by optical microscopy, image processing and density determination. It was found that the pore characteristics mainly depended on the shape and size of used ammonium bicarbonate particles in present study. The porosity of the alloys could be tailored by controlling the amount of ammonium bicarbonate addition. The porous TiNb24Zr4alloys were near β type titanium alloys, which consisted mainly of β phase and a little of α phase. The amount of α phase increased in the porous alloys due to segregation caused by the addition of pore-forming agent.
Combination of Extrusion and Artificial Aging to Strengthen AZ80 Magnesium Alloy
Authors: Yin De Liang , Chen Xin
Published: September 2011

Conventional extrusion and artificial aging were combined to investigate the possibility of superposing precipitation strengthening on texture strengthening. Uniaxial tension test was used to characterize the mechanical properties and the static toughness values were calculated. Metallographic microscope and TEM were employed to observe the microstructures after extrusion and artificial aging. It is shown that remarkable discontinuous precipitation occurs after artificial aging at 150 °C. Although static toughness was slightly reduced, the yield strength was obviously increased and therefore good strengthening and toughening effect was achieved.
Fabrication of Al2O3 Based Ceramic Matrix Composite by Conventional Sintering and Sol-Gel Process
Authors: Senthil Kumaran S. , Chandra Sekhar K. , Preetam A. , Balasivanandha Prabu S.
Published: September 2011

Alumina (Al2O3) matrix composites reinforced with 10%, 20% and 40% of 10µm size aluminum particles were fabricated by two processes, namely cold pressing and sintering process and Sol-Gel process. Al2O3, Al, 5% volume fraction of cobalt was mixed together, compacted and then sintered at 400-500oC for 30 minutes to fabricate the CMC. In the Sol-Gel fabrication route the Al2O3, Al, Co were blended with water and aged for 2-3 days to remove all the moisture and to enable oxidation of Al reinforcement. The mixture was cold pressed and sintered at 400-500oC to produce the CMC. The composition analysis of the CMC carried out by EDAX clearly showed that Al2O3 particles were formed by oxidation of Al reinforced in the matrix, effectively forming Al2O3/Al2O3 particulate reinforced ceramic matrix composite. The nature of the bonding at the interface was characterized using Scanning Electron Microscopy (SEM). The amount of porosity was determined using image analyzer based on ASTM B 276 standard. The average micro hardness of the samples was measured. The optimum volume fraction of aluminum for better interface bonding and reduced porosity was determined using the results obtained.
Preparation of a Simple Heat-Resistant Coating of the Optical Fiber Embedded in Composites
Authors: Yin Yan Zi , Wang Ji Hui , Yang Ze Hui , Sun Jiu Xiao , Tian Heng , Gong Ling Ling
Published: September 2011

A new kind of optical fiber corylic resin coating was prepared in this paper. The influence of PVC (pigment volume concentration) to the properties of coatings was studied. The best formula was selected. The best coating was painted on the optical fiber. The relationships of the coating diameter and the distances of the centers of the coating layer and optical fiber were studied. It was found that the circle diameter of coating is greater; the distance of centers of circles is bigger. Finally, the optical fiber with this coating was embedded in resin castings. The cross sections were observed under the same heated situation. The results revealed that the coatings embedded in composites used in large aircraft had no change when it was heated. This kind of coating did not need ultraviolet light or heating, and it’s easy to control the thickness and roundness of the coating by controlling the speed of pulling out the optical fibers. This type coating is a kind of simple heat-resistant coating embedded in composite materials used in the large aircraft.