bluuebunny/crossref_metadata_2025 huggingface dataset:
The Blue Luminescence of CeCl3 Doped Aluminum Oxide Thin Film
Authors: Liao Guo Jin , Luo Hong , Yan Shao Feng , Chen Ming
Published: August 2011

Aluminum oxide film doped with Ce3+ has been deposited by the medium frequency reactive magnetron sputtering technique. The photoluminescence emission from these films show peaks at range of 374-405 nm. The relative intensity of these peaks is strongly dependent on the amount of Ce incorporated in the films. The presence of Ce3+ as well as the stoichiometry of these films has been determined by energy dispersive x-ray spectroscope (EDS) measurements. It is proposed that the light emission observed generated by luminescent center associated with cerium chloride molecular rather than to atomic cerium impurities. The reason for a dominance of the lower energy transition as the amount of Ce3+ in the oxide films is increased is that the energy difference of 4f1and 5d1 decreases, with the increase of the Ce3+ concentration. These luminescent films are potentially good candidates for photonics applications.
Study on the Effects of the Self-Healing Microcapsules on the Tensile Properties of Polymer Composite
Authors: Zhang Li , Dong Xiu Ping , Chen Hao
Published: August 2011

By designing different formulations of composites and adopting optimized technology including extrusion and molding, the different composites with various content microcapsules were prepared. The results of the tensile tests show that with the increasing content of self-healing microcapsules in the glass fiber reinforced nylon composites, the mechanical properties of the composites will change, i.e. tensile strength, elastic modulus will decrease. But there is little effect on the mechanical properties of the composite gears if the content of self-healing microcapsules is less than 3.5%, and the technology of self-healing microcapsules used in the polymer composite gear is feasible.
Study on Effect of Sintering Temperature on Microstructure and Compressive Property of Porous NiTi Alloys
Authors: Yu Jing Yuan , Li Qiang
Published: August 2011

Porous NiTi alloys were prepared by powder metallurgy method using NH4HCO3as space-holder. The effect of sintering temperature on pore characteristic, phase composition and compressive property of porous NiTi alloys was studied by XRD, SEM, EDS and a universal testing machine. The results show with the increase of sintering temperature the porosity of porous NiTi alloys first increases and then decreases, but the content of NiTi phase, compressive strength and modulous of sintered products continuously increase. When sintered at 980°C for 2h, the porous NiTi alloys have higher porosity of 53.6%, better compressive strength of 173.7MPa and elastic modulous of 4.2GPa. The phases of sinter products are mainly composed by TiNi, Ti2Ni, and TiNi3phases.
Fabrication and Sinter-Ability of Ce3+-Doped YAG Ceramics by Low-Temperature Combustion Method
Authors: Wang Zhi Qiang , Sun Xin , Zhou Xiao Li
Published: August 2011

The phosphors YAG doped with Ce3+was prepared by low-temperature combustion method. Utilizing the prepared YAG powders as raw material and Li2O-CaO-ZnO-Y2O3-Al2O3-SiO2glass powder as sintering additive, YAG:Ce3+ceramics were sintered at 1400-1550°C for 10h in vacuum. Thesinter-ability of the YAG ceramics was studied by measuring the linear shrinkage rate. The phase, microstructure and photoluminescence properties of the YAG: Ce3+powders and ceramics were investigated by X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence (PL) analysis. The results show that the sinter-ability properties of YAG:Ce3+ceramics was mainly associated with sintering temperature and contents of glass sintering additive; the best result was achieved when the sample was sintered at 1500°C and doped sintering additive of 1%.
Synthesis and Lithium Storage Performance of Sn-Co/C Composite Anode Materials for Li-Ion Battery
Authors: Yang Shao Bin , Shen Ding , Wu Xiao Guang
Published: August 2011

The Sn-Co/C composites as novel anode materials for lithium-ion batteries were prepared by solid-state sintering. The influences of carbon black content in Sn-Co/C composite on material structures and the electrochemical properties were investigated. Structure analyses show that carbon black mainly is physically mixed with CoSn phase and could inhibit the growth of grain of CoSn phase, avoid the formation of large particles and increase the specific surface area obviously. Electrochemical analyses show that the refinement of grain size or particle size could contribute to improve the discharge capacity and cycle performance, but the increasing of specific surface area could reduce the charge-discharge efficiency. When carbon black content is 6 wt.%, the discharge capacity reach its maximum, which is 275 mAh/g, the initial charge-discharge efficiency is 52.8% and the retention of discharge capacity is 72.8% after 30 cycles.
Structural, Electrical and Optical Properties of Li-Doped ZnO Thin Films Influenced by Annealing Oxygen Pressure
Authors: Tang Li Dan , Wang Bing , Wang Jian Zhong
Published: August 2011

Li-doped ZnO thin films were grown on quartz substrates by radio frequency magnetron sputtering and In-situ annealing. The structural, electrical and optical properties of Li-doped ZnO films strongly depend on the annealing oxygen pressure. XRD and AFM analysis indicate that the ZnO films possess a good crystallinity with c-axis orientation, uniform thickness and dense surface. Optical transmission spectra show a high transmittance (~85%) in the visible region. Hall measurement demonstrates that ZnO films have p-type conduction with a Hall mobility of 5.0 cm2/Vs, resistivity of 0.97Ωcm and carrier concentration of 1.60×1017cm-3when annealing oxygen pressure is 1Pa.
Synthesis of Nano Amorphous In2O3 by Microwave Method and its Photocatalysis
Authors: Si Wei , Yu Jing Yuan , Li Qiang
Published: August 2011

Precursor In(OH)3 was synthesized by ultrasonic method with carbamide and indium salt, and was performed microwave radiation, then nano amorphous In2O3 was obtained. The structural and morphology of precursor and In2O3 were characterized by TG-DTA, XRD, TEM, etc. The results show that the In2O3 is nano amorphous with average grain size 12nm by microwave method. This paper discovered that nano amorphous In2O3 has good photocatalysis when we used it to degrade acidic black dye.
Synthesis and Growth Mechanism of NbSe2 Nanostructures
Authors: Wu Qiong
Published: August 2011

Nb and Se elements were encapsulated in a quartz ampoules (Ø8×100mm), Then heated to 750°C and keep the quartz ampoules at corresponding temperature for 1h. Nanowires of NbSe2were obtained. This method is simple and minimizes the pollution. The nanostructure was investigated by XRD、EDAX、SEM、TEM and HRTEM. The results show that the nanostructures have outer diameters in the 40~200nm range, with lengths in excess of several hundred nanometers. Besides, growth process of nano- structure was discussed.
Influence of Electrical Pulse on Shape Memory Effects and Phase Transition of FeMnSiCrNi Shape Memory Alloy
Authors: Liu Xing Jiang , Gao Yan , Qi Jin Gang
Published: August 2011

This paper studies the electric-pulse applied in the solidification process of the FeMnSiCrNi shape memory alloy, by applying different pulse frequency and polarity on the FeMnSiCrNi shape memory alloy to improve the shape memory effects. The results show : electric-pulse was conducive to FeMnSiCrNi alloys grain refinement, the alloy can improve the shape memory effect of Compression deformation, the absolute shape recovery rate is improved from 2% to 3.2% which is not treated by the electric-pulse ; when the liquid metal was connected with the anode of the pulse, it is easy to get the columnar grain structure and the column spacing is smaller; when the liquid metal was connected with the cathode of the pulse, the column spacing is larger; Columnar grain is conducive to FeMnSiCrNi alloy specimens compressed shape recovery, it has the smaller column spacing, yet the shape recovery rate is higher; equiaxed is favor in bending back, columnar crystals impede the bending response.
Study on the Influence of Different Pulse Temperatures on Al-22%Si Alloy Solidification Structure
Authors: Zhao Zuo Fu , Wang Jian Zhong , Qi Jin Gang , Dai Shan , Zhang Dong Jun
Published: August 2011

Taking the hypereutectic Al-Si alloy as the research object, the fading characteristics of Al-22% Si alloy at different pulse temperatures are investigated in this paper in order to analyze the mechanism of electrical pulse modification to the alloy. We can get the conclusion by observing the microstructure of the sample, measuring the microhardness and calculating the volume fraction and the average size of primary silicon: at different pulse temperatures, the effect of electric pulse modification is fading with static duration prolonging; meanwhile, with the temperature upward, the modification effect and fading trends to be weak, which indicates the best pulse temperature is one of the important factors to influence the modification effect.
Analysis of Structural Condition and Thermodynamics Condition of Graphite Heterogeneity Nucleation in Cast Iron
Authors: Qu Hua , Liu Wei Dong
Published: August 2011

Based on the empirical electron theory of solid and molecule, the valence electron structures(VESs) of graphite, CaS and MnS in cast iron are calculated, their bond-forming energy F of the structure unit and bond-forming energyEof the crystal plane are defined and calculated. Combined with the nucleation theory of the liquid metal,Fand E are applied to analyze the thermodynamics condition of graphite heterogeneity nucleation in undercooling liquid of case iron, i.e.,GL-FG>GL-FH,>. According to the coincidence lattice model of large-angle grain boundary used commonly in modern times, the corresponding structural condition is analyzed, i.e., the crystal structure of graphite should have the better lattice contract ratio with the crystal structure of its annexed heterogeneous particles.
Study on the Activation Energy of Nanocrystallization of Amorphous Fe78Si9B13 Alloy Treated by Low Frequency Pulse Magnetic Field
Authors: Zhou Ying Chun , Zhang Qi Jian
Published: August 2011

The amorphous Fe78Si9B13 alloy was treated by low frequency pulse magnetic field (LFPMF). The microstructure was observed by Mössbauer spectroscopy and Transmission Electron Microscope. The activation energy of nanocrystallization of amorphous alloy Fe78Si9B13 treated by low frequency pulse magnetic field was determined by differential scanning calorimetry (DSC). The results indicated that the activation energy was decreased from 433.6kJ.mol-1 to less than 200kJ.mol-1 after LFPMF. The nucleating rate of α-Fe(Si) was increased and there was only single phase α-Fe(Si) crystalline formed.
Theoretical Calculation of β Transition Temperature of Ti-6Al-4V from Valence Electron Level
Authors: Qu Hua , Liu Wei Dong
Published: August 2011

Based on the empirical electron theory of solids and molecules and the basic theory of the phase transformation of titanium alloys, a new method to calculate β transition temperature of titanium alloys is put forward after calculating the valence electron structure(VES) parameternAwhich is the covalence electron pairs on the strongest bond of alloy phases, the crystal cell weight of a and b phases in the structure, the compensation coefficient of the phase and the temperature coefficient of b stable element. After calculating we find β transition temperature of Ti-6Al-4V is 974.9 °C, the error of the theoretical calculation value and the experimental one(995 °C) is 2%, so it is feasible to calculate β transition temperature of the titanium alloys from covalence electron level.
The Promotional Effect of Lanthanum Additive on the Apparent Electrocatalysis of Ti/(Ru,Ir)OX Electrode
Authors: Long Ping , Li Qing Fen , Xu Li Kun , Xue Li Li , Xin Yong Lei
Published: August 2011

Ti/(Ru,Ir)Ox, and Ti/(Ru,Ir,La)Ox oxide electrodes were prepared by using thermal decomposition of the metal chlorides in the precursor solution on the Ti base. Their apparent electrocatalytic activity investigated by cyclic voltammetry, polarization curve, scanning electron microscope and X-ray diffraction. These data show that Ti/(Ru,Ir,La)Ox oxide electrode exhibits considerably high voltammetric charges, apparent current density and low onset potential for the ClER and OER. The XRD results reveal the main formation of the La-containing oxide electrode in amorphous phase.
Influence of Processing Parameters on Atmospheric Pressure Plasma Etching of Polyvinyl Alcohol Films
Authors: Peng Shu Jing , Qiu Yi Ping
Published: August 2011

This paper investigated the influence of various processing parameters of atmospheric pressure plasma jet (APPJ) on the etching behavior of PVA films. The etching rate increased as output power, and moisture regain increased. As the treatment time increased, the etching rate increased initially and then decreased. Atomic force microscopy (AFM) results showed that the surface roughness varied as the moisture regain (MR) (2.45%, 9.32%, and 78.31%, respectively) of PVA films changed during APPJ treatment. It was found that higher moisture regain and lower thermal conduction of underlayer had negative effect on the solubility of plasma treated PVA films.
Photoluminescence of (Gd1-x,Dyx)2O2SO4 Phosphors Synthesized by Homogeneous Precipitation Method
Authors: Lian Jing Bao , Wang Wen Guang , Wang Bing Xin , Li Jing
Published: August 2011

(Gd1-x,Dyx)2O2SO4 phosphors were synthesized by a homogeneous precipitation method from commercially available Gd2O3, Dy2O3, H2SO4 and Urea ((NH2)2CO) starting materials. XRD analysis shows that the amorphous precursor can be transformed into pure Gd2O2SO4 phase by calcining at 900 °C for 2 h in air. Photoluminescence (PL) spectroscopy reveals that the strongest and second emission peaks are located at 575 nm and 485 nm under 277 nm UV light excitation, which corresponds to the 4F9/2→6H13/2 and the 4F9/2→6H15/2 transitions of Dy3+ ions, and both transitions of Dy3+ ions have a single exponential decay behavior. The quenching concentration of Dy3+ ions is 1 mol%. The CIE chromaticity coordinate and the color temperature of (Gd0.99,Dy0.01)2O2SO4 phosphor are (0.306, 0.379, 0.315）and 6546 K, respectively.
Fabrication and Luminescent Properties of Eu3+-Doped Yttrium Lanthanum Oxide Transparent Ceramics
Authors: Yang Qiu Hong , Lu Shen Zhou , Bian Zhi Jia , Li Yun Han , Shi Zhi Fa , Li Ying Zi
Published: August 2011

High-transparent Eu3+-doped yttrium lanthanum oxide ceramics were fabricated with nanopowders and the highest transmittance in the visible light wavelength region reaches 78%. The Eu3+-doped transparent ceramics exhibited a broad absorption band around 240 nm, a sharp red emission at 611 nm under X-ray excitation and the fluorescent decay time of 0.96 ms. It is expected to be a potential polycrystalline scintillation material for the applications in medical-imaging detectors.
The Effect of Sc2O3 on Yb3+-Doped Y2O3 Transparent Ceramics
Authors: Lu Shen Zhou , Yang Qiu Hong , Shi Zhi Fa
Published: August 2011

Yb3+-doped Y2O3and (Y0.9Sc0.1)2O3transparent ceramics were fabricated, and their microstructures, structural and spectral properties were investigated. Sc2O3can effeciviely inhibit the excessive grain growth in Yb:Y2O3ceramics, and increased the transparency. The lattice parameter of Yb:(Y0.9Sc0.1)2O3became small due to introducing of Sc3+ions. The emission bands of Yb:(Y0.9Sc0.1)2O3ceramics are inhomogeneously broadened compared to Yb:Y2O3. The broad emission bandwidths of Yb:(Y0.9Sc0.1)2O3ceramics are favorable for the generation of ultrashort mode-locked pulse laser.
The Preparation and Characterization of LaAlO3 Translucent Ceramics
Authors: Wang Yong Gang , Yang Qiu Hong , Huang Dong Dong , Lu Shen Zhou , Shi Zhi Fa , Li Yun Han
Published: August 2011

LaAlO3 translucent ceramics were fabricated with solid-state reaction method and sintered in vacuum condition. The powders are synthetized at 1200°C. There are almost no pores in the grains of ceramics sintered at 1750 °C. But the ceramics have few La2O3 second phase. The highest transmittance is 22%. The low transmittance may be caused by scattering losses of La2O3 second phase.
Fabrication and Spectroscopic Properties of (Ho0.01La0.10Y0.89)2O3 Transparent Ceramics
Authors: Huang Dong Dong , Yang Qiu Hong , Wang Yong Gang , Zhang Hao Jia
Published: August 2011

Highly transparent (Ho0.01La0.10Y0.89)2O3transparent ceramics were fabricated by the conventional ceramics processing with nanopowders. The microstructure, the optical properties and the spectroscopic properties of (Ho0.01La0.10Y0.89)2O3 ceramics were investigated. (Ho0.01La0.10Y0.89)2O3 ceramics with the grain size of ~50 μm were obtained by sintering at 1530 °C for 45 h. The highest in-line transmittance reaches 65%. The emission peak located at 2 μm wavelength indicates (Ho0.01La0.10Y0.89)2O3 transparent ceramics is suitable for 2 μm laser gain medium.
Effect of Y Addition on Mechanical Properties of Ni50Mn28Ga22 Magnetic Shape Memory Alloy
Authors: Liu Ai Lian , Xu Jia Wen , Gao Li , Zheng Yu Feng
Published: August 2011

The effect of Y addition on the average grain size and mechanical properties of Ni-Mn-Ga magnetic shape memory alloys is researched by means of optical microscope, compressive test and scanning electron microscope (SEM) in the paper. The results show that Y addition refines the grains of Ni-Mn-Ga alloy significantly and significantly enhances the compressive strength and maximum compressive strain. In addition, the fracture type changes from typical intergranular crack to transgranular crack gradually with Y addition.
Study on the Preparation and Properties of PEG Phase Change Materials Fixed by Semi-IPN
Authors: Zhang Hong , Wang Xiao Lei , Wang Qian Qian
Published: August 2011

Semi-IPN phase change material (PCM) which is suitable for the temperature adjustment textile field is prepared by solution copolymerization. The structure of framework material is a three-dimensional network prepared by N-hydroxymethyl acrylamide, and the phase change material is prepared by polyethylene glycol with molecular weigh 2000. The orthogonal experimental method is used for determining the optimum formula and investigating the various factors on the phase change material properties. Structure and properties of the composite properties are synthesized by SEM, DSC, TGA. The result shows: the advanced process of making composite phase change material is that PEG owns 70% of the overall mass fractions, initiator owns 2.5% of monomer mass fractions, the molar ratio of cross-linker monomer is 1:8, the reaction time is 3 hours, and mass ratio of monomer to water is 1:6. The prepared composite material is distributed uniformly of framework holes, and it has a well fixed effect to the phase change material, which the phase transition temperature is 32.92 °C, the enthalpy is up to 108.41 J / g. It also has a good thermal stability, and applies to the spinning environment which the temperature is not higher than 300 °C.
Effect of Post-Annealing Ambient on Electrical Structural Properties and Optical Properties of ZnO:Al Transparent Films
Authors: Tang Li Dan , Wang Bing , Wang Jian Zhong
Published: August 2011

Transparent ZnO:Al films deposited by RF/DC magnetron sputtering in room temperature are annealed under gaseous ammonia ambient and air ambient, respectively. The characteristics of ZnO films are examined by XRD, SEM, Hall measurement and optical transmission spectra. The XRD and SEM analysis shows that both films are crystallized in the wurzite phase with a preferential orientation along the c-axis and have a smooth dense surface. Hall measurement results indicate ZnO:Al films annealed under ammonia ambient convert to p-type conduction with the high carrier concentration of 8.3×1018 cm-3. Optical transmission spectra show a high transmittance (~85%) in the visible region.
Effect of SnO2 Coating on the Low Temperature Extrusion of 6061Al Matrix Composite Reinforced with Aluminum Borate Whisker
Authors: Zhao Pei Tang , Du Zhi Ming , Wang Li Dong , Fei Wei Dong
Published: August 2011

The 6061Al matrix composites reinforced with SnO2-coated aluminum borate whisker were fabricated using squeeze casting method. The composites with different SnO2 coating contents were extruded successfully at 350°C with the extrusion rate of 18mm/s. The results show that the Sn particles at the interface as liquid state at extrusion temperature result in the reduction of the extrusion load and the decrease of the probability of whisker fracture during hot deformation process. Moreover, unlike many surface cracks can be seen in the extruded composite without whisker coating, the surface crack-free extruded rods can be obtained for composites with whisker coating. The ABOW/SnO/6061Al composites tensile properties increased obviously after extrusion.
Research on Drag Reduction Effect of Concave Non-Smooth Surface in Air
Authors: Xu Zhong , Li Shu Zhao , Wu Xiao Yan , Zhao Xi Jiang
Published: August 2011

The standard k-ε turbulence model was used to simulate the flow of a new unsmooth surface - dimple concave surface in air and the drag reduction coefficients of both unsmooth surface and smooth surface with hemisphere of 0.4mm radius were presented. The result showed that this kind of unsmooth surface had a good drag reduction effect for flow velocity ranging from 4m/s to 48m /s. And it had the best reducing ability (7.2%) at a velocity of 24 m/s. The theory of the drag reduction was finally analyzed.
Effect of Voltage and Current Density on the Coating Performance of Micro Arc Oxidation on Pure Titanium Metal
Authors: Jin Guang , Zheng Nan , Lou Chang Sheng
Published: August 2011

The maximum thickness of the pure titanium metal coating by micro arc oxidation increases when current density increases, but the color isn’t even when the current density is too big. Thickness of the coating increases when voltage increases,but the color isn’t even when the voltage is too big. The better technical parameters are Na2SiO3 100g/L, voltage 350V, current density 100A/dm2, oxidation time 150 s, the thickness of the coating is 12 μm, the color is light-grey and even. The diameter of the holes of the coating increase when voltage or current density increases. The coating mainly contains O, Si and Ti elements. The coating’s micro hardness is 1000 HV.
Preparation of Flexible Polymer-Cement Mortar
Authors: Sun Shi An , Fei Yi Wei , Xiao Yun Peng , Yang Hong Wei , Zong Zhi Min
Published: August 2011

A new flexible polymer-cement mortar was prepared by adjusting the ratio of cement, polymer emulsion and solution. The effects of cement and different kinds of polymer emulsion on the construction performance of composite materials such as workability, anti-aging, flexibility and impact resistance were evaluated. It was indicted that the prepared flexible polymer-cement mortar possessed a good application prospect.
Wearability of SiCP Particle Reinforced Aluminum Matrix Composites Creeper Tread
Authors: Du Zhi Ming , Qin Jin , Liu Jun , Chen Gang , Jia Hai Meng , Xie Shui Sheng
Published: August 2011

Wearability of SiCpreinforced aluminum matrix composites creeper treads was studied. Wear resistance of these creeper treads was tested by sliding friction pin-disk tester at room temperature. Friction morphology was observed and the friction mechanism of these creeper treads was investigated. The experiment parameters such as SiCpparticle size, volume fraction, mixing temperature, mixing time were adjusted and the best parameters were found through the tests. The results showed that the creeper tread had the most excellent wearability, high strength and hardness with 875r/min mixing speed, 40min~60min mixing time, 660°C~700°C mixing temperature, 7μm SiCpparticle size and the 10vol% SiCpvolume fraction. There were no microscopic holes and other defects in these dense composite materials. The interface between SiCpand Al matrix was clean and straight, where Al4C3brittle phase wasn't observed.
Complex Modification on Microstructure and Properties in Mg2Si Reinforced Hypereutectic Al-Si Composite
Authors: Liu Zheng , Liu Xiao Mei
Published: August 2011

The effects of complex modification which mainly consisted of mixed rare earth oxides and CaCO3 on microstructure and properties in Mg2Si reinforced hypereutectic A1-Si composite were researched. The results indicated that the morphology of Mg2Si particle changed from irregular or crosses to polygonal shape, and its size obviously decreased. The hardness and wear resistance of the composite were improved by the complex modification.
Preparation of Magnetically Modified Zeolites and the Application of Metal Ions Adsorption
Authors: Yuan Ming Liang , Yu Liang , Tao Jia Hua , Song Cong
Published: August 2011

Natural zeolites combined with the magnetic iron oxides are prepared by a chemical coprecipitation process. A detailed characterization of our magnetically modified zeolite (MMZ) is given, including powder X-ray diffraction (XRD), nitrogen adsorption and vibrating sample magnetometer (VSM). The results reveal that in comparison with Na-zeolite, the structure of MMZ has no obvious change but its surface area increases from 25.13 m2g-1to 100.90 m2g-1. The adsorption properties of MMZ to Pb2+and Cu2+were studied. The results show that the maximum loading capacities for Pb2+and Cu2+in the initial concentration range are 123.74 and 14.633 mg g-1, respectively. The MMZ can be used as an adsorbent for removal of heavy metal ions from industrial effluents or municipal waters, and the saturated adsorbent is separated from the medium by a simple magnetic process.
Influence of High Current Pulsed Electron Beam Irradiation on Ni-P Electroless Plating
Authors: Xu Yang , Hao Sheng Zhi , Zhang Xiang Dong , Li Min Cai , Dong Chuang
Published: August 2011

The surface irradiation of 6063 aluminum alloy by high current pulsed electron was conducted with the aim of replacing the complicated pre-treatment in the processes of electroless plating. To explore the microstructure changes, optical metallography, SEM (scanning electron microscope), XRD (X-ray diffraction) analyses were carried out, and the sliding tests were used for the detection of wear resistance. It was concluded that the HCPEB irradiation could replace the pre-treatment of aluminum substrate as required in conventional electroless plating with a decreased surface roughness of Ni-P alloy plating layer. The plates exhibited an amorphous microstructure as demonstrated by XRD analysis. The plates, produced with the routine of HCPEB irradiation, activation and electroless plating possess, also exhibited good quality, even better than that of conventional electroless plating technique.
Research on Mixture Design and Mechanical Performance of Porous Asphalt Concrete in Cold Regions
Authors: Xu Jin Hua , Chen Si Li , Wang Ying , Li Gang
Published: August 2011

Porous asphalt pavement (PAC) is constructed with an open-graded porous mixture with 15–25% designed air void and 4–5 cm surface thickness. This paper presents paving material selection and requirements of porous asphalt concrete in the cold regions. Through a series of laboratory tests, optimum gradation of the aggregates and bitumen content (BC) were selected, which met all aspects of performance indexes. Uniform experiment design methods, including Marshall test, immersion Marshall test and Freezing–thaw indirect tensile test, were applied to analyze road performance of PAC, such as temperature stability, water stability, resistance to Freezing and thawing and so on. The results confirmed that PAC studied is an effective pavement surfacing materials in cold climate regions.
The Influencing of Fibers on the Concrete Used to Nuclear Waste Container
Authors: Li Yi , Zhou Jia Jun , Han Jian Yong , Zhang Chang
Published: August 2011

To ensure the carrying safety and long-term durability of nuclear waste, using orthogonal mix proportion design and incorporating steel, polypropylene hybrid fiber, fly ash or steel fiber solely in the concrete, then flexural properties and impermeability tests are carried out respectively in normal temperature and after being heated to 150°C. By the gradation and variance analysis, the quantification of effects which the different kinds of admixtures and their incorporation had toughness and impermeability of concrete had been done: The bond force of steel fiber A which is more longer and with the type of sheared thread and concrete is better, the effect of crack-resistance and toughening is all better when pre-and post heated; As the addition of the fiber mixing amount, the bending property basically present the tendency enhanced for hybrid steel fiber A and B; The factors play a strengthened role in impermeability height of concrete with the increase of fiber’s content, for the order of effect: A> C> D> B. When the time for heating is longer than 17 days, the impermeability of steel fiber concrete SP-10 is stronger than high-strength concrete SP-13, therefore, the hybrid steel fiber (A , B) concrete is fit for container for nuclear waste.
Manufacturing Process of Large Scale Sandwich Structure with Variable Thickness of PMI Foam Core
Authors: Wang Chun , Zhang Xuan Ming , Tang Chun Ying
Published: August 2011

Composite sandwich structures are extensively used in the aerospace, wind power, sports equipment, shipbuilding, automotive and train locomotive industries in order to improve structure rigidity and reduce weight. The molding process of sandwich structure using glass cloth and fibre materials as panels has been reported in many literatures. However, few researches are found relative to the molding process of large scale sandwich structure with the characteristics of thin-walled aluminum alloy panels and variable thickness of Polymethacrylimide (PMI) foam cores. This paper describes a preformed molding process that consists of thermoforming foam core blocks, assembling blocks into a whole sandwich core, CNC machining the sandwich core according to surface models of the thin-walled aluminum alloy panels, and finally, bonding and curing panels and sandwich cores.
Manufacturing Brake Pads by Using Hot Powder Preform Forging for Low Duty Applications
Authors: Ghazi A.A.S. , Chandra K. , Misra P.S.
Published: August 2011

To develop a high density brake pad for low duty application, a P/M route based on ‘Hot Powder Preform Forging’ was developed, which is not possible by sintering route. The mechanical properties of these materials were characterized using ASTM standards. The limitations of the conventional technique i.e. Compacting and Sintering for the manufacture of brake pads were tried to remove by adopting this technology. It offers better opportunity for pore free materials with better bonding between metallic and non-metallic constituents. Fade and Recovery test were done by using a Krauss Tester. μfade, μrecoveryand μperformancelie within the range of friction materials used for low duty applications.
Modeling and Simulation on Four-Way Valve Control Motor System of Cable Car Reel
Authors: Mao Jun , Mo Guo Wei
Published: August 2011

In the cable car work process, the performance of valve control motor system directly influences the drum controlling accuracy and stability. In order to analyze the dynamic characteristic of servo hydraulic system and optimal design parameters, cost reduction and shortened product development cycles. Aiming at the cable car valve control motor major components of hydraulic system are analyzed, establishment of the math model, and deduces the transfer function. Using matlab software of system analysis of time domain. The results show that the system well meet the design requirements, and has good stability, and to the cable car drum the servo control system design and testing has laid a solid theoretical foundation.
Design of Monitoring Device for Goods Train Based on Zigbee Technology
Authors: Huo Chun Bao , Liu Chun Ling , Zhang Cai Juan
Published: August 2011

Design and implementation of system of wireless-monitoring for goods train is based on ZigBee technology. The system is consisted of ZigBee monitoring nodes on-site and handheld display terminal. The JN5139 wireless microprocessor is used as the master controller for ZigBee monitoring nodes, which is produced by JENNIC Ltd. in Britain. ZigBee device nodes automatically form wireless sensor networks, and use door magnetic sensor circuit which has high sensitivity and fast response to monitor the status of the door. The alarm information about the status of the door will be transmitted to the handheld wireless terminal to display and alarm. RFID technology is useful in conditions that mobile and car numbers are arbitrarily setted for freight transport in the process of practical design. Furthermore, modular design is used to facilitate the maintenance of the system and improve the capabilities of real-time, reliability, stability and anti-jamming.
Research and Application of an Enhanced Data Mining Algorithm in Virtual Manufacturing Technology
Authors: Tong Yu Jun , Zhou Jun , Xie Wen Ge , Jia Dan
Published: August 2011

Association rules mining is an important branch of data mining. Apriori algorithm is a classical algorithm of mining association rules. Based on the original Apriori algorithm an improved Apriori algorithm is analyzed according to the multiple minimum supports and support difference constraint. An experiment has been conducted and the results showed that the new algorithm can not only mine out the association rules to meet the demands of multiple minimum supports, but also mine out the rare but potentially profitable items’ association rules.
Study on the Reliability Allocation Algorithm Based on Partial Squares Sum
Authors: Jiang Yue Ling , Jiang An , Xie Wen Ge , Jia Dan , Tong Yu Jun , Chen Wen Shi
Published: August 2011

In this paper, it is first time that partial squares sum combined with orthogonal design according to the characteristics of quality assurance system, and applied to the reliability predicting and allocation, therefore, We may get the best reliability allocation.it has more important role to device new production.
Research on Iterative Learning Servo Controller of Permanent Magnet Linear Synchronous Motor
Authors: Cao Yong , Luo De Jun , Li Hua De
Published: August 2011

An iterative learning servo controller with RBF network feed-forward position compensation is proposed to control the mover of permanent magnet linear servo system to track reference position signal. The structure of RBF feed-forward position controller is analyzed in detail. The effective estimation of nonlinear load is realized by higher-order D-type iterative learning identification method. The feedback position control law was made up of load identification and feedback error signal. Finally, the simulation results demonstrate that this method can assure system obtains good servo performance.
Study on a Novel Single-Stage QR PFC Converter
Authors: Hou Xiao Yun
Published: August 2011

A novel quasi-resonant single-stage single-switch PFC flyback converter is analyzed. By the additional winding, power factor correction can be achieved, and the topology can be simplified. The circuit can work in quasi-resonant mode, so the switching loss is reduced. By means of digital frequency reduction, the efficiency of the converter is improved further.
Study on Voltage Stability of Electricity Network Structure Based on the Eigenvalue Method
Authors: Lu Bao Chun , Liu Yi , Li Bao Guo , Wang Jin
Published: August 2011

A new Structural analysis method of voltage stability in large power grid is proposed based on the eigenvalue Method in this paper. the method establishes an improved current injection model of Y+D matrix of the topological structural characteristics, which is helpful to the study of mechanism of voltage instibility. Through calculating the eigenvalue of the Y+D matrix, influence of network topology structure to the voltage stable in the electrical power system is analyzed. The simulation results show that voltage stability has close relationship with topological structure of the power network structure.
Influences of Technology Parameters of Heavy Shell Ring Rolling Mill with Double Drive Rolls Based on FEM
Authors: Sun Jian Liang , Peng Yan , Ma Bo , Liu Hong Min , Chen Su Wen , Sun Bin Bin , Liu Gang
Published: August 2011

The heavy shell ring rolling process was taken as subject investigated. Because the size of shell ring is very large and the material of shell ring is special, in order to make the shell ring to be bitten smoothly and make the rolling process stable, the double drive rolls was proposed in the shell ring rolling mill. The thermal simulation test of heavy shell ring material was made on the Gleeble 3500 thermal simulation test machine. Based on FEM, the three dimensional thermal mechanical coupled model of shell ring rolling process was built in this paper. The influences of process parameters on the stress field, strain field and mechanical parameters were investigated. Simulation results show that, with the increase of feed velocity, the strain of shell ring increases, the forging penetration condition becomes good; With the increase of friction coefficient, the equivalent plastic strain of shell ring surface layers increases, the equivalent plastic strain of shell ring middle layers has little change. The conclusions are significant for designing equipments of shell ring rolling mill and developing new rolling schedule.
CAE Optimization Design of Mine Hoist Spindle Device
Authors: Yu Zhen Liang , Li Wei Min
Published: August 2011

Based on ANSYS finite element analysis software for the platform the hoister spindle device overall assembly analysis were accomplished by the finite element theory and method. The overall stress and strain of convective cloud were achieved in the paper, which is the foundation for further overall structure optimization design and assembly analysis research. Meanwhile topological optimization analysis for the board of the picture of drum was gotten and humanoid pore model board was given, which provided a strong theoretical basis for the mine hoist spindle device optimization design.
Dynamic Strain Aging Induced by Cyclic Deformation in Two Magnesium Alloys
Authors: Chen Li Jia , Li Jia , Li Feng , Wang Xin
Published: August 2011

Cyclic deformation for two magnesium alloys AZ91 and AM50 with different processing status has been performed under total strain amplitude control mode and at room temperature. A serrated flow can be observed in both tensile and compressive directions of the stress-strain hysteresis loop for as-extruded AZ91 and AM50 magnesium alloys. It means that the so-called dynamic strain aging occurs during cyclic deformation. In addition, the dynamic strain aging phenomenon can also be observed in two extruded magnesium alloys subjected to aging treatment as well as the AZ91 alloy subjected to solution treatment. However, the dynamic strain aging seems not to take place in the extruded AM50 alloy subjected to solution treatment because there exists no significant serrated flow behavior in either compressive or tensile direction of the stress-strain hysteresis loop. It is suggested that the occurrence of the dynamic strain aging is associated with collective behavior of many mobile dislocations as well as interactions between solute atoms and dislocations.
Weld Width Control System for Pulsed MIG Welding of Aluminum Alloy
Authors: Lu Li Hui , Fan Ding , Huang Jian Kang , Zhu Ming , Shi Yu
Published: August 2011

Due to strong heat accumulation and low surface tension of aluminum alloy, weld width will become wider, even subsidence in pulsed MIG welding process of aluminum alloy at constant parameters. A variable double-pulse method for weld width control is proposed. Weld width control is realized by changing double-pulse duty cycle that is the ratio of high-energy pulse time in a double-pulse cycle to adjust heat input based on the vision sensing for weld width. A rapid prototyping control system is built on the basis of vision sensing and xPC Target real-time environment. Then variable double-pulse MIG welding process test is done and proves the feasibility of the control scheme. On this basis, weld width control test in pulsed MIG welding of aluminum alloy is carried out and obtains a good weld with beautiful formation and uniform weld width. The results show that weld width control can be realized well with the variable double-pulse method in pulsed MIG welding of aluminum alloy.
Study on Stress Intensity Factors for Circumferential Cracked Elliptical Pipes under Tension
Authors: Wang W. , Cai Y. M. , Xie Y.J.
Published: August 2011

Stress intensity factor is one of the most important parameters in fracture mechanics. Based on the principle of virtual work and bending theory, this paper proposes a method to estimate the stress intensity factor for circumferential cracked elliptical pipes and derive the expression of the stress intensity factor for circumferential cracked elliptical pipes under tension. The compare of the result of this method and finite element method shows this method is credible and convenient.
Fatigue Analysis of the Aircraft’s Hydraulic Pipes Based on Fluid–Structure Interaction
Authors: Lv Hui , Qiu Yuan Ying , Sheng Ying
Published: August 2011

In the work environment, the structure of aircraft’s hydraulic pipes and the fluid inside constitute a typical fluid-structure interaction (FSI) system, in which there are transfers of momentum and forces between the pipes and fluid. Excitation caused by high frequency pulsation of flow and pressure may lead to fatigue damage of the structure. In order to help the designers estimate the dynamic response of the aircraft’s hydraulic pipes, the FSI of aircraft’s hydraulic pipes is investigated in this paper. Using ANSYS CFX and ANSYS Mechanical as the tools, a finite element analysis was done to compute the stresses and strains of the fluid-filled pipes caused by high-pressure pulsation. Furthermore, the fatigue analysis was done to evaluate the safety of the structure.
The Virtual Design of Cluster Straw Fuel Briquetting Machine
Authors: Wang Feng Hui , Tian Zhao Ying
Published: August 2011

Biomass forming technology is an effective way of using biomass energy. Based on the relative technology information from the home and abroad, the “cluster straw” as a new type of fuel briquetting machine has been proposed. According to many kinds of test data forming straw fuel briquetting machine, the force and power parameters were determined. By using the three-dimensional design method, the virtual design molding of cluster straw fuel machine is built. The strength analysis has been done on finger wheel by the finite element method, which came to valuable design data to referring to; wheel-shaped structure was modified to improve the strength.
Research for Tool Face Mathematical Model of Multi-Facet Drills Used in Processing High Manganese Steel
Authors: Xu Li , Yang Liang , Shi Zhi Hui
Published: August 2011

The multi-facet drill shows good performance during materials are difficultly machined. However, for a new type of the drilling point, the grinding has been the main problem that restricts its application. To properly grinding the drill point confirms the design parameters, the relationship between design parameters and grinding parameters must be resolved. The mathematical model is the key to solve this problem. In this paper, according to the design of the high manganese steel drilling tool, a mathematical model has been established by the plane grinding method to solve grinding parameters, and to achieve improved mechanical grinding of drill point.
Analysis and Simulation of Velocity and Acceleration Based on Three-Translational Parallel Mechanism
Authors: Xu Dong Tao , Sun Zhi Li , Du Yong Ying
Published: August 2011

Aimed at three-translational parallel mechanism, the velocity Jacobian matrix is formulated on the basis of analytical method, so the velocity and acceleration of the moving platform is calculated. Then the velocity and acceleration formulas of all components’ centroids are deduced based on the vector method. The above formulas are very simple and easy to solve. Kinematic simulation is carried out by ADAMS virtual prototyping software. The operating data is obtained, it verifies the correctness of the theoretical calculation.
Research on Surface Morphology of Three-Dimensional in CNC Cylindrical Grinding
Authors: Fan Zhi Guang , Gong Ya Dong , Dong Yong
Published: August 2011

The grind test is detected curve of the grinding surface roughness of cylindrical in use of three-dimensional contour in this paper, major influence factor in the accuracy of surface roughness is proposed in the analysis based on the chatter.
Study on Fatigue Life Prediction of Mechanical Components with Stochastic Cyclic Load Application
Authors: Wang Zheng , Wang A Na , Guo Kai , Cheng Jiang Hua
Published: August 2011

Based on the nominal stress method for fatigue life prediction, the model for predicting the fatigue life of mechanical structures under random cyclic load is developed in this paper. The uncertainty of the cyclic loads applied on the mechanical structures is analyzed. With the number of load application as the life index, the fatigue life prediction models of mechanical structures under random cyclic load are developed with the probability weighted method and the Miner linear cumulated damage rule, when the relationships between fatigue life and stress can be expressed as the exponential function and the power function, respectively. Finally, the models proposed are used to predict the fatigue life of train axis.
The Numerical Simulation and Optimization of Squeeze Casting Process for Producing Magnesium Wheels
Authors: Yao Rong Qing , Tang Hong Qiang
Published: August 2011

The simulation of squeeze casting process of a magnesium alloy wheel was practice. Using professional casting software, the temperature field during filling and solidification process, and then the potential defects were forecasted and previewed. It was found that there would be shrinkage defects at the center and the junctions between the rim and the spokes of the wheel. It is better to choose a mould temperature for a better cast property at meet of full-filling. Number of programs are analyzed and compared through orthogonal experiment. And the best parameter team is educed through analysis. It is confirmed that the potential micro-shrinkage is reduced by simulated again using the best parameter team. And the cast property is enhanced.
Experiment Research on Impact of Total Rolling Reduction Ratio on the Properties of Vacuum Rolling-Bonding Ultra-Thick Steel Plate
Authors: Wang Guang Lei , Luo Zong An , Xie Guang Ming , Zhao Kun
Published: August 2011

Method of vacuum rolling-bonding can be used to produce ultra-thick steel plate over 100mm with continuous casting slab. In this paper, four groups steel plates have been rolled with 10%, 30%, 50% and 70% total reduction ratio respectively. The microstructure of the interface has been analyzed by optical and scanning electron microscopy (SEM). The reaction products formed at the interface have been identified by EDAX. It has been observed that the size and the amount of the reaction products decreased with the increase of the total reduction ratio. The tensile property of the thickness direction has been tested by the universal testing machine. The results indicated that, with the increase of the total reduction ratio, the strength had been increasing from 532MPa to 564MPa, and the plate plasticity became well.
Curvature Characters of Revolving Curved Surface and Applications in Math Model of Milling Cutter
Authors: Ding Wei , Wang Xin Yu
Published: August 2011

The curvature characters of revolving curved surface are discussed. A list of the formulas of average curvature and Gauss curvature are made. The math model can be used to provide references to design some milling cutter.