bluuebunny/crossref_metadata_2025 huggingface dataset:
Basic Research on Reduction Characteristics of Niobium Compounds in CaO-SiO2-Al2O3 Slag
Authors: Jiang Yin Ju , Zhao Zeng Wu , Xu Zhang Yin , Li Bao Wei
Published: February 2012

Reduction experiments between slag-metal at 1600°C were carried out by using equilibrium method, in which the slag phase was CaO-SiO2-Al2O3 containing Nb2O5 or Fe(NbO3), while the metal phase was Fe-C or Fe-Si. Reduction ability of carbon and silicon as well as reduction characteristics of Nb2O5 and Fe(NbO3) were compared.
The Assessment of Work Hardening Behaviour of Dual Phase Steels with Coarse Martensite Islands
Authors: Rasouli Azam , Mazinani Mohammad
Published: February 2012

In this paper, the tensile properties of dual phase (DP) steels with different martensite contents have been studied. Two steels with 0.09 and 0.15% carbon were used for the production of DP steel samples via intercritical annealing treatment, and the deformation behaviour of DP steel samples were examined during tensile loading. Although DP steels usually show two-stage work hardening behaviour, DP steels in this study with relatively high martensite content and coarse islands size exhibit a three-stage work hardening behaviour. This unusual behaviour was attributed, with the help of SEM micrographs, to decohesion of martensite-ferrite interface and martensite cracking.
Effect of Microstructures on Corrosion of X80 Pipeline Steel in an Alkaline Soil
Authors: Xu Cong Min , Li Rong Biao , Wang Ji Long , Zhang Gang Gang
Published: February 2012

The influence of microstructures with different heat treatments to stimulate the weld fusion zone and HAZ on corrosion properties of X80 pipeline steel was investigated in alkaline sand soil using electrochemical measurement and surface analysis(SEM, EDS and XRD). The results showed that the microstructure of X80 steel affected the properties of corrosion product layers. Generally, X80 steels with heat treatments had a higher corrosion rate than the as-received steel. The increase of pearlite content enhanced the corrosion of ferrite through a galvanic effect. The appearance of upper bainite and martenite increased further the activity of the steel. The corrosion product layer formed on as-received X80 steel was compact and complete, provided an effective protection to the underneath steel. However, the corrosion product layers on the heat-treated X80 steels were generally inhomogeneous, loose, porous and defective, and provided minor protectiveness. The cathodic/ anodic reactions of X80 steel are dominated by the oxygen reduction and formation of iron oxides that deposit on the steel surface which was through a physical block effect to afford the protection. We shall be able to publish your paper in electronic form on our web page http://www.scientific.net, if the paper format and the margins are correct. Your manuscript will be reduced by approximately 20% by the publisher. Please keep this in mind when designing your figures and tables etc.
Effect of Mo and Ni Content on the Mechanical Properties of Low Carbon and Alloy Steel Casting Sample for Coal-Mining Machinery
Authors: Ma Zhi Ying , Yang Yi Tao
Published: February 2012

The effect of Mo and Ni content on the mechanical properties of low carbon and alloy casting steel by using Vacuum Arc Melting Furnace had been studied in this paper. The results indicated that increasing Mo or Ni content would enhance the hardness and strength of the steel separately, with some of elongation loss. It showed that ferrite refined with the increasing alloy content. The combinations of Mo and Ni content were of importance for comprehensive mechanical properties and wear resistance. The appropriate content in low carbon casting steel with 0.02%Nb was 0.5%-0.6%Mo and 0.2%-0.4%Ni.
Research on Forming Process of Anodic Oxide Film of AZ91D Magnesium Alloy
Authors: Ma Xiao Chun , Hu Jian Cheng , Tao Ying Qi
Published: February 2012

The matrix of AZ91D Magnesium alloy can be covered with a coat of protective film through anodic oxidation treatment, it’s able to make certain that the optimal surface combination properties are generated especially on corrosion resistance. This thesis is devoted to the research on forming process of anodic oxide film of AZ91D magnesium alloy; the experiment shows the formation of anodic oxide film at constant pressure is accompanied by precipitation of gases and fluctuation of current, XRD indicates that anodic oxide film is composed of MgO、γ-Al2O3 and a small amount of Si.
Study on Optimization of Machining Parameters in Electrochemical Machining
Authors: Wang Lei , Gai Jiang Ning
Published: February 2012

In electrochemical machining (ECM) machining accuracy of workpieces is greatly influenced by many machining parameters. In this paper the BP neural network model is employed to optimize machining parameters in ECM. Taking a three dimensional complicated surface as the research object the experimental results have shown that the optimization process can be easily operated and the result is of high precision.
Research of Ultrasound and Electromagnetic Field on the Microstructure of Cast-Rolling Magnesium Strip
Authors: Tan Xiang Fu , Mao Da Heng , Li Jian Ping
Published: February 2012

Experimental study on ultrasonic and electromagnetic roll-casting of magnesium alloy was carried out using a self designed and installed twin roll continuous horizontal caster . 2.5mmthickness and 200mmbreadth of AZ31B magnesium alloy casting strips were produced successfully. The results show that the ultrasonic and electromagnetic field is transferred into roll-casting zone and result in a great decrease of the grain size,the average grain size has decreased to 10～15μm from 60～70μm; and also improved the mechanic properties of the AZ31B magnesium alloy sheet, the tensile strength and yield strength and elongation and hardness are improved by 25%and 44.4% and 120.7% and 12%respectively. On this basis, the mechanism of grain refinement during cast-rolling process with ultrasonic cavitation and electromagnetic field effect are discussed.
Comparison on the Compositions, Microstructure and Hardness of Super Large Section Prehardened Steels for Plastic Mould Block
Authors: Luo Yi , Wu Jun , Wu Xiao Chun , Min Yong’an , Wang Hong Bin
Published: February 2012

Compositions and hardness of four prehardened steels for plastic mould blocks with more than 1 m thick, named QTPA, QTPB, QTPC and QTPD were tested, and microstructures at center and surface of blocks were observed. The results show that hardness uniformity of the QTPC steel block is less than ± 4 HRC, its center appears pearlite, while microstructures at center of the other three steel blocks are martensite and bainite, hardness uniformity of the QTPA steel is less than ±1 HRC, hardness uniformity of the QTPB and QTPD steels are less than ±2 HRC. Combined with the compositions analysis, molybdenum has bigger effect on the hardenablity and hardness uniformity of the large section prehardened steels for plastic mould block, and QTPC steel with higher carbon and lower Molybdenum content makes the hardness uniformity be less than the others.
Synthesis of Silver Nanoparticles through Two-Phase Reaction by the Reduction of N, N-Dimethylformamide
Authors: Yu Da Wei , Chen Yan Ming , Shi Gui Mei
Published: February 2012

Sliver nanoparticles were synthesized in organic phase through two-phase reaction procedure using DMF as a reducing agent and oleate as a ligand without addition of phase transfer agent.
Managing B2B-Supply Chain with Option Contract under Disruptions
Authors: Ruan Jian , Pang Su Lin , Nong Guo Ping
Published: February 2012

By establishing an option contract model under disruptions in chronological order, we analysis the optimum decision variables and application of option contract to manage the changes in the supply chain benefits which result from the changes of market demand distribution under disruptions, and get optimal strategies. The conclusion is the option contract to supply chain members to achieve shared interests and risks, effective response the changes in market demand with B2B E-markets under disruptions. Finally the conclusion is verified by numerical example.
Hydrogen-Induced Wear of Ti–6Al–4V Alloy
Authors: Yuan Bao Guo , Yu Hai Ping , Li Ping , Xu Gui Hua , Li Chun Feng , Xue Ke Min , Sun Dong Li
Published: February 2012

The effects of hydrogen on friction and wear properties of Ti–6Al–4V alloy sliding against GCr15 steel were investigated through dry sliding friction and wear tests in atmosphere at room temperature. Wear mechanism was determined by studying the morphology and chemical element of worn surface using SEM and EDS. Results show that friction coefficient decreases slightly and wear rate increases after hydrogenation. Wear mechanism is discussed.
Mechanical Performance of Composite Laminate with Oblique Splicing Ply
Authors: Wang Ling , Jia Pu Rong , Li Liang
Published: February 2012

In order to determine the mechanical properties of the carbon/polyurethane composite laminate with splicing ply, the tensile testing were performed on laminate specimens which has been designed specially. The tensile elastic modulus and tensile strength were obtained from the experimental datum. The breakage happened in place of joint gap. The stiffness of the composite laminate was affected by the oblique splicing ply significantly, but the strength is mainly determined by the continuous layers. The laminate is failure in low load. The numerical analyses using linear elastic and progressive damage model were conducted with the commercial the finite element model (FEM) software ABAQUS. The linear elastic FEM is established to calculate the inter-laminar stress. The progressive model is used to predict the strength on the basis of numerical computation. There are three different criteria used here in the strength prediction. By combining the damage model with classical lamination theory, the behavior of laminates under plane stress loading is predicted. The results show that the experimental tests are in good agreement with the finite element simulation.
Graft Copolymerazation of 1-Vinylimidazole onto Poly(vinylidene Flouride) by Radiation-Induced Grafting for Fuel Cells Membrane
Authors: Lepit Ajis , Ahmad Aini Nazli , Ali Abd Malik Marwan , Mohd Dahlan Khairul Zaman , Yahya Muhd Zu Azhan
Published: February 2012

γγψγRadiation-Induced grafting of high energy γ-rays onto proton conducting polymer electrolyte membranes (PEMs)-based poly(vinylidene flouride) (PVDF) immersed in 1-Vinylimidazole (VIm) solution have been studied. The different concentrations of VIm from 0.5 to 3.0 M in 1,4-dioxane were prepared. The samples were then exposed to γ-rays from 20 to 100 kGy. The properties of the membranes were characterized based on degree of grafting, spectroscopic study, surface morphology, and X-ray diffraction (XRD) measurement. The degree of grafting (DoG) increased in the PVDF membrane associated with absorbed dose. The results showed that the surface morphology of the membrane observed homogenous when grafting with VIm the after irradiation that compliment with XRD study.
Thermal and Dielectric Properties of Inorganic-Organic Nanocomposites Involving Epoxy Resin and Polyhedral Oligomeric Silsesquioxanes
Authors: Yang Li , Yin Miao , Li Xiu Yun , Ma Han Bing
Published: February 2012

In this paper, a type of nanoporous polyhedral oligomeric silisesquioxanes (POSS) containing eight functional groups have been synthesized and mixed with diglycidyl ether of bisphenol A (DGEBA) to form epoxy resin networks with nanostructures. The cured octa(aminophenyl) silsesquioxane (1c-POSS) and DGEBA system inherently possesses higher thermal stability and higher char yield than the control epoxy resins. Furthermore, the dielectric constant of the 1c-POSS/DGEBA material (4.36) is substantially lower than that of the neat epoxy resins (4.64) as a consequence the presence of nanoporous POSS cubes in the epoxy matrix.
Dielectric and Magnetic Properties of Sintered Cobalt Ferrite Derived from Nanocrystalline Powders
Authors: Wu Liang Neng , Jiang Li Zhen , Hong Fang Yu
Published: February 2012

A kind of Cobalt ferrite ceramics were successfully prepared by using nanocrystalline powders synthesized by citrate gel method. The relative dielectric constant and loss tangent of the ceramic as a function of frequency (100 Hz - 1 MHz) was investigated at room temperature. Both of them decrease with increase in frequency showing dispersion. Hysteresis loop magnetization was measured and the ceramic show good magnetic characteristics at room temperature.
Effect of Temperature on Impact Properties of ZA27 Alloy
Authors: Zhong Li Ping , Si Jia Yong , Zheng Zi Qiao
Published: February 2012

The impact toughness of ZA27 alloy at different temperatures is investigated by pendulum impact testing. In addition, the morphology of impact fracture surface observed by SEM. The results indicate that impact energy of ZA27 alloy is reduced with the temperature rising when the temperature is lower than 100°C. At 100°C to 200°C, impact energy increase as the temperature rising. And when the temperature reaches to 250°C, impact energy suddenly descend. Impact energy is the highest and reaches to 72.768J at 20°C. At impact fracture surface, it is mostly tear ridges and dimples. The higher the impact energy is, the more obvious the characteristic of tear ridges is. Furthermore, dimples are small and distribute more uniformly. Lower the impact energy, the less distinct of tear ridges. Dimples are larger and deeper, their distribution are not uniform. Impact behavior of material could be evaluated by the width of impact curve. The wider the peak of impact curve, the higher the impact toughness. But impact toughness is worse while peak is narrow.
Local Electric Field Distribution of Graded Cylindrical Composites
Authors: Ding Xia , Guo Guang Hai , Niu Wei Guo
Published: February 2012

For a sinusoidal alternating current (AC) external field of finite frequency ω , the local electric field distribution at all harmonics has been investigated by graded cylindrical composites with power-law gradient inclusions. In the dilute limit, the obtained results show that the local electrical field distribution in the cylindrical inclusion region is controllable and the electric field peak’s position inside the cylindrical composites can be confined at its centre by varying the parameters of the graded dielectric profiles.
Spinning Effluents Treatment from Dry-Spun Acrylic Fiber Producing by Integrated Membrane Filtration
Authors: Yan Guang Xu , Zhang Qian , Li Hui , Li Yu
Published: February 2012

Spinning effluents (SE) from dry-spun acrylic fiber producing are hard to biodegrade for dimethyl formamide (DMF) and nitriles contained. Integrated membrane filtrations including micro-filtration (MF), ultra-filtration (UF) and nano-filtration (NF) were adopted to separate the pollutants in SE. Experiment showed that MF has weak capacity for the removal of organic pollutants, while NF and UF contributed to 49.49% and 31.51% to the initial COD removal rates of SE.
Synthesis and Characterization of Bacterial Cellulose/Calcium Silicate Composites
Authors: Ouyang Yang , Yin Na , Chen Shi Yan , Tang Lian , Wang Hua Ping
Published: February 2012

A novel composites material consisting of calcium silicate deposited in bacterial cellulose membrane was synthesized by immersing BC membrane in the calcium and silicate solutions by turns with different cycle times and characterized. The results indicated that the CaSiO3 particles were homogeneously dispersed on the surface of nanofibers with the effect of BC template when two cycles of soaking proceed, during which the fabrication of most CaSiO3 particles took place. The FT-IR reveals the strong interaction between the two parts of the BC/CaSiO3 composite. The XRD pattern demonstrated a crystal structure disruption of the cellulose aroused by CaSiO3 particle. BC/ CaSiO3 is considered to have a potential application in bone tissue field.
LBM Application in Two-Phase Fluid Flow with Large Density Ratio
Authors: Chang Qing Ming , Yang Yin Kai , Yuan Jing , Chen Xia , Zhang Min
Published: February 2012

In this paper, a stable lattice Boltzmann model (LBM) based on non-ideal gases is presented for simulation of incompressible two-phase flows with large density ratio. To reduce the parasitic currents across the interface and correspondingly increase the numerical stability, the stress and potential forms of the surface tension force is employed. The applications to a stationary bubble and capillary-gravity wave with density ratio 1000 are given to verify this model. The numerical solutions is agree well with analytic solutions of the Laplace's law and capillary-gravity wave.
Preparation of Al-N Based Material by Ti-Bearing Blast Furnace Slag
Authors: Xu Ying , Cai Yan Qing , Dong Gong Yue
Published: February 2012

Combining with the outstanding performance of Ti (C, N), such as wear-resistant, withstand high temperature and alkali erosion, Ti-bearing blast furnace slag was modified, and Al-N-based materials were prepared in this paper. Based on the thermodynamic analysis, reasonable formula program was designed by the phase diagram, and then through high-temperature orthogonal experiments, a reasonable process condition was determined. The experimental results showed that the twice firing at the temperature of 1500°C was propitious to carbonitriding reaction. SiO2 was participated in carbonitriding reaction as reactant, which was conducive to the formation of Ti≡N bond. Eventually Al-N based materials that meet the design requirements were obtained.
Study on Simulation and Visualization of Microstructure
Authors: Li Ping
Published: February 2012

In this study，a simulation model of deformed microstructure has been proposed on the basis of the initial microstructure obtained from normal grain growth simulation with Monte Carlo method．And simulation models of recrystallization microstructure of heterogeneous and simultaneous nucleation and random growth of nuclei have been developed in terms of the mechanism of microstructure evolution．On the basis of the simulated microstructure parameters distribution obtained by incorporating the neural network model into FEM Code，simulation and visualization of the microstructure of Ti-15-3 alloy during hot compression deformation and solution treatment have been realized．Comparison of the simulated results with the corresponding experimental ones indicates that the size and distribution of the simulated grains agree well with the actual ones．These studies lay scientific foundation for determining reasonable hot forming process．
Effects of V2O5 Addition on the Microstructure and Microwave Dielectric Properties of ZnNb2O6 Ceramics
Authors: Yan Zhong , Huang Jin Liang , Gu Yong Jun , Jin Biao , Wang Ru Yu
Published: February 2012

ZnNb2O6 ceramics doped with V2O5 were prepared by conventional mixed solid method. The effects of V2O5 addition on the microstructure and the microwave dielectric properties of ZnNb2O6 ceramics were investigated systematically. The sintering temperature of ZnNb2O6 ceramics with 1.0wt.% V2O5 addition can be effectively reduced from 1150°C to 1050°C. The secondary phase ZnV2O6 was observed in sintered samples with V2O5 addition content higher than 1.0wt.%. For 0.3–3wt.%V2O5-doped ZnNb2O6 ceramics, The dielectric constants (εr) of densiﬁed samples were higher than that of undoped ZnNb2O6 ceramics. The temperature coefficient of resonant frequency (τf) were shifted toward zero direction with the increase of V2O5 addition, However, the dielectric loss (tanδ=1/Q) increased. The 1.0wt.% V2O5-doped ZnNb2O6 ceramics sintered at 1050°C for 3h have the optimum microwave dielectric properties: εr=28, tanδ=0.0006 and τf=-42.5 ppm/°C.
Properties of Ni-Cu Bulk Alloy Prepared by Spark Plasma Sintering Technique
Authors: Li Li Xin
Published: February 2012

Ni-Cu bulk alloys were successfully prepared with spark plasma sintering (SPS) technique from nanopowders obtained by the arc plasma evaporation method. The tensile tests indicated that the tensile strength of Ni-Cu bulk alloy sintered by SPS at 600°C was the highest among the Ni-Cu bulk alloys sintered at different temperature and much higher than that of bulk ingots. Through investigating the fractographs of the bulk alloy, the intrinsic reasons for the tensile strength of the sintered specimens were discussed.
Dynamics Modeling of Main Rotor Teeterboard Flap on Unmanned Autonomous Rotorcraft by D' Alembert Principle
Authors: Fang Cun Guang , Li Jie , Wang Wei
Published: February 2012

On teeterboard flap of main rotor rotating around free space point of a 30Kg class unmanned autonomous helicopter (UAH), aerodynamics kinematics model is set up in terms of D' Alembert principle. On conditions of the helicopter physical parameter value, simulation validates the model in reason, and points out：①Teeterboard Flap on main rotor is self-stable system; ②unmanned autonomous helicopter structure plays a leading role on transient process of main rotor teeterboard flap, and relative air current acting on the blade plays a leading role on its steady process.
Preparation of Dumbbell-Like ZnO Microcrystals and Characterization of their Thermal Radiation Properties
Authors: Zhao Liang , Zhu Yong Ping
Published: February 2012

3D-ordered dumbbell-like ZnO microcrystals were prepared under hydrothermal conditions without using any additive, template or surfactant. FE-SEM images show that 3D-ordered dumbbell-like ZnO microcrystals are made of two elements-(Ⅰ) dumbbell-like microrods and (Ⅱ) nanorods that grow on the two ends of microrods. The thermal radiation properties of 3D-ordered dumbbell-like ZnO microcrystals were discussed in detail.
Quality Inspection of Reinforced Concrete Structures and Reinforcement
Authors: Bu Na Rui , Cai Huan Qing , Bai Run Shan , Li Zhi Qiang
Published: February 2012

In the modern design and construction of building structures, building structural safety, reliability is a top priority for construction work. In combination with practical engineering quality inspection and reinforcement methods the building structure are analyzed and presented.
Financial Competitiveness of China's Textile and Clothing Companies Based on Factor Analysis
Authors: Chen Hong Ming , Kang Ya Nan
Published: February 2012

It use factor analysis in this article, through the special analysis about 46 listed textile and garment companies' profitability, solvency, growth capacity and operational capabilities of Shanghai and Shenzhen Stock Exchange, conduct empirical research of the Textile and clothing companies’ financial competitiveness to get the samples’ position in the industry, as well as each factor’s affection on the corporate consolidated financial competitiveness and recommend rationalization proposals for the industry to enhance the companies’ overall financial competitiveness, which will promote the development of textile and apparel industry.
Experiment Study on the Running-In Properties of Double-Circular-Arc Gear
Authors: Wu Jie , Zhang Shuo
Published: February 2012

The experiment of running-in properties of Double Circular-Arc has been done at power circulating testing. We have obtained rules of wearing at running-in stage. It may supply references to establish practical running-in course.
Aerodynamic Analysis in Time Domain of a Cable-Stayed Bridge
Authors: Chen Chern Hwa , Lin Yuh Yi , Chang Cheng Hsin , Yang Shun Chin , Cheng Yung Chang , Huang Ming Chih
Published: February 2012

To determine its actual dynamic responses under the wind loads, modal identification from the field tests was carried out for the Kao Ping Hsi cable-stayed bridge in southern Taiwan. The rational finite element model has been established for the bridge. With the refined finite element model, a nonlinear analysis in time domain is employed to determine the buffeting response of the bridge. Through validation of the results against those obtained by the frequency domain approach, it is confirmed that the time domain approach adopted herein is applicable for the buffeting analysis of cable-stayed bridges.
The Effect of Macro-Synthetic Fiber on the Seismic Performance of Reinforced Concrete Columns Carried Out by Experiment Study
Authors: Ma Hua , Zhou Li Chun , Li Zhen Bao , Wang Hong Huan , Hao Xiao Min , Sun Xin Yu , Zhang Xue Wei
Published: February 2012

The macro-synthetic fiber is widely used to prevent the cracking at concrete members. By the way of experiment that macro-synthetic fiber-reinforced concrete ductile columns comparing with the usual fiber-reinforced columns under the action of low-frequency cyclic loading, seismic performance of the columns in different form of bars were obtained. Meanwhile, the damage pattern, hysteresis curve, ductile coefficient and equivalent viscous damping coefficient of the columns could be also obtained. The results show that the macro-synthetic fiber-reinforced concrete ductile column has the better ductility and the higher post-crack energy absorption ability.
Vibration Analysis for Pipeline Connected with Centrifugal Pump by FEM
Authors: Dong Jun Hua , Bao Xiang Fu , Xie Peng Bo
Published: February 2012

The vibration of a complicated pipeline connected with centrifugal pump has been studied by ANSYS. The first 32 natural frequencies and the first five modal shape of the pipeline system is obtained by Modal analysis. The result shows that its excited frequency is close to the 30th natural frequency of the pipeline system，which will result in resonance. Because excited force caused by pulsatile fluid in pipe can make pipeline to has a compulsive vibrations, harmonic respones analysis is used to determine continuous dynamic characteristics of pipeline. The critical frequencies of node with the maximal amplitude at 30th modal shape are 12.452Hz and 56.284Hz by investigating its spectrum image of displacement. The major principal stress at two critical frequencies, far exceeding the yield strength of material, is respectively -1223MPa and 621 MPa, which demonstrates that the pipeline are very incidental to be destroyed.
Vibration and Noise Reduction of PASSIM 12K Cigarette Machine
Authors: Li Shan
Published: February 2012

Because of PASSIM 12K cigarette machine improper design, equipment parts wear and tear, and aging sound-absorbing material, unit will generate a lot of noise when running. Through analysis noise spectrum characteristics of main suction cabinet, determine the characteristics of broadband noise spectrum, complete the design of vibration isolation system. And after transforming, measure noise spectrum value of main suction cabinet from 86dB to 76.5 dB
Analysis of Bolt Fracture Cause for Gearbox of Cold Rolling Mill
Authors: Wang Xing Dong , Shi Lei , Peng Wei , Li You Rong , Liu Ao
Published: February 2012

In order to solve the continual bolt fracture fault for gearbox of rolling mill in one cold strip rolling mill plant, vibration signals of gearbox in the process of rolling were collected by experimental research. Based on the signal analysis, combined with the results of statics and modal analysis of bolt, abnormal vibration of gearbox is confirmed the main cause for bolt fracture. Moreover, by further signals analysis of gearbox and vibration intensity analysis of bearing pedestal, finally found deflection of input shaft is the direct cause for gearbox abnormal vibration. Through the maintenance, it was found that eccentricity ring of bearing of input shaft had been worn down. The results of maintenance proved effectiveness of this paper.
Application of Association Rules Mining in Employment Guidance
Authors: Wang Lei , Yi Cun Xiao
Published: February 2012

How to improve the employment rate of graduates is an important task for higher vocational colleges to solve. In order to effectively improve their Employment competitiveness, advice should be made to help students to enhance specific kinds of learning and ability. Association Rules Mining is one core of the Data Mining Association Rules, it’s helpful in finding useful information hidden in complex data. By using Association Rules Mining in finding the knowledge and ability which helps employed students to earn their jobs, necessary ability for each kind of job can be found, and then advice offered for students to target their employment career will be more exact and proper.
Study on Polymer Powder Solid Extrusion Forming
Authors: Mu Bing Song , Fan Zhi Xin , Barton D C
Published: February 2012

Engineering plastics has many uses, such as national defence, communication and scientific research. In this paper a new experiment plan was proposed in order to get a new engineering plastics forming method. Through the compressive test of polyoxymethylene powder, the process parameters such as temperature, stress and velocity are obtained.Based on the parameters got from compressive test polyoxymethylene powder solid extrusion forming was studied by self-made device. Microscopic analysis and mechanical properties test show that the process parameters are reasonable, the crystallinity increase and molecular chain is oriented along the extrusion direction, as a result the tensile strength and modulus increase greatly.
The Vibration Response Analysis of Coupling System and its Experimental Validation Based on the SEA Method
Authors: Lu Shou Wei , Feng Hui Hua , Mou Xiao Long , Zuo Zheng Xing
Published: February 2012

In this paper, methods of acquiring internal loss factors and coupling loss factors by experimental measurement are investigated. The internal loss factor and coupling loss factor of two coupled plates is measured by the modified power injection method. The SEA model of coupled system is established based on the measured results of internal loss factor (ILF) and coupling loss factor (CLF). A random vibration analysis is conducted as a validation example. Since the formulation solution and measured result agree preferably, the validity of the measurement method and the effectiveness of analyzing vibration response using SEA are proved.
Analysis and Solution Proposals of the Coating Defects on the Galvanized Cables
Authors: Hong Li Hua , Chen Yong Lu
Published: February 2012

The phases composition and forming mechanism of the coating defects on the galvanized cables produced by different manufacturers have been analyzed and compared by SEM and EDS. The results showed that: the white phases in the coating of the galvanized cables were mainly the ZnO2 phase and the gray ones were the zincilate. The coating quality could be improved by optimizing the galvanization process parameters and assurancing the compactness of the coating and its adhesion to the matrix.
The Research of the Numerical Simulation on the Granular Ballast Bed Tamping
Authors: Wang Xue Jun , Chi Yi Lin , Li Wei , Zhou Tao Yong , Geng Xing Li
Published: February 2012

Abstract. Under the action of high speed train and the repeated heavy vehicles, the granular ballast bed produce degradation and deformation that do not restore, tamping homework is an effective method that is being used to recovery the elastic of the track. In this article, the discrete element method is be used to establish a cross discrete particle flow simulation model between ballast track bed and tamping picks, and to simulate the movement and vibration characteristics of the granular ballast particles while tamping. The three main work are included in this paper. With the large commercial software EDEM, the first main work is to research the modeling method of ballast particles. The second work is to establish firm-soft coupling particle flow simulation model among ballast 、sleeper and tamping picks. The third work is to validate the ballasts' mechanical properties' change rule under the railway sleeper, while different tamping working condition and out load are being implemented. The research shows the discrete element method is effective for solving the vibration problem produced during the process of tamping homework.
Research on Green Supply Chain Operating Model of Electronic Manufacture Industry
Authors: Ji Shou Wen , Deng Ting , Dong Yan Tao
Published: February 2012

This paper studies the concept, connotation of green supply chain in the background of electronic manufacture industry, its operating model and construction process. The research expounds several processes within the operating model, like green design, green procurement, green manufacture, green distribution and green recycling. The research serves as a fundamental for the operation management, control and evaluation in the green supply chain of electronic manufacture industry.
Optimized Design of the Structure of High-Speed Railway Bearing Test Rig
Authors: Jia Xian Zhao , Yu Yong Jian , Liu Hong Bin
Published: February 2012

This paper establishes the finite element model of main spindle in the test rig for high-speed railway bearing. Utilizing the finite element analysis software ANSYS, the modal analysis for spindle is carried on. Preliminary determination is that spindle resonance occurs. Structural optimization is carried out by increasing first natural frequency and reducing weight of main spindle in order to avoid resonance. The results showed that the position of support bearings is determined. The first natural frequency is increased by reducing spindle weight. The dynamic performance of the spindle is improved, avoiding the resonance region effectively.
Numerical Analysis of Quasistatic Contact between Rubber Roller and Rigid Roller
Authors: Wang Bing , Wang Zhao Wu
Published: February 2012

A quasistatic and steady state contact problems of rubber roller and rigid roller is modeled by using a stress function in the form of series. The model is derived from the paper feed unit of duplicating machine. The point interpolation meshfree method (PIM) is applied to obtain the solution of the dual series equations resulting from the boundary condition. Stress and deformation for the rubber roller are obtained based on elasticity theory. Effects of rubber thickness and normal load are observed through the numerical examples. The observation show that the contact zone is changing with the normal load F and the rubber thickness has effect on the stress distribution. In addition, the study shows that the PIM method is an efficient and promising method for simulating the problem.
Meshing Performance Analysis of New Non-Zero-Positive Modification Spiral Bevel Gear
Authors: Zhang Hua , Tie Xiao Yan
Published: February 2012

For non-zero-modification spiral bevel gear, its machining parameters could be designed with big contact ratio by Local Synthesis. This design method could make up the shortage of low coincidence degree resulted by increasing mesh angle in the non-zero-positive transmission designing. Taking an example, according to comparing the new with conventional design simulation results, the max root tensile stress of pinion was reduced by 28.36%, and the max root compressive stress was reduced by 23.31%, and the max tooth surface contact stress was reduced by3.5%, and the root stress of gear was a bit decreased under the same load conditions. The conclusions showed that the pinion bending strength was improved obviously, and new tooth profile design and its machining parameters made gear pair possess higher life and reliability.
Dynamics Research of RRR-PRP Planar Six Bar Mechanism
Authors: Wu Ying
Published: February 2012

For being convenient for researching the dynamic characteristic and the improvement and use of RRR-PRP planar six bar mechanism, for improving the dynamic technical performance, the three-dimensional solid model of the mechanism was established with ADAMS. Each part of the model in ADAMS was set up. Simulation analysis on the working process of the mechanism was achieved. The structure optimization parameters of the mechanism were obtained. The result proves that the vertical locations of two end points of rocker are almost no impact on the vertical velocity of slider. The location of block and the horizontal locations of two end points of crank and rocker have less impact on the vertical velocity and acceleration of slider. The vertical locations of two end points of crank have greater impact on the maximum vertical velocity and acceleration of slider.
Dynamics Analysis for Naval Gun with Consideration of Contact between Arc and Gear
Authors: Ke Xue Wei , Hou Jian , Wei Ping
Published: February 2012

The effect of contact between cradle arc and main gear of elevating mechanism on muzzle disturbance is studied.The precise 3D models of involute straight tooth gear and arc are constructed by PRO/E software.Considering the contact between cradle arc and main gear of elevating mechanism,the nonlinear finite element model for naval gun is established.The results of numerical simulation show that the contact/impact has great effect on muzzle disturbance.
Research on Analysis and Simulation of Random of the Machine Gun RCWS
Authors: Mao Bao Quan , Wang Chuan You , Liu Xin Liang , Wu Yong Liang , Dai Dong Ming
Published: February 2012

Based on rigid-flexible coupling dynamic model, firing density model and ADAMS / Insight platform, the chamber pressure random of machine gun RCWS is studied by stochastic dynamics simulation of stochastic chamber pressure curve generated by the Monte-Carlo random generator and the internal ballistics module. It can provide theoretical guidance to the virtual fire accuracy of the machine gun RCWS.
Researches on Diameter Automatic Measurement Device of Artillery Gun Tube
Authors: Shi Wei , Wang Xiao Juan , Ren Shao Qing , Wang Jian Guo
Published: February 2012

The powder chamber of cannon gun tube was an important indicator which affected gun performance. The accuracy of fire, precision and the other technical indexes were inevitably affected by the chamber geometry parameters directly or indirectly. So the detection of cannon gun tube was an important part in the whole gun detection technology. This paper introduced the structure and the measuring principle about diameter automatic measurement device of cannon gun tube and made a prototype. Then the experimental verification was carried out. The experimental results showed that the automatic measuring device had the advantages of simple principle, convenient operation, high precision, and had a certain popularization value in use.
International Comparison of Continuous Improving Performance in Chinese Enterprises and the Research of Improvement Measure
Authors: Yang Yang , Shi Chun Sheng , Hu Li Run
Published: February 2012

No matter what managerial strategy is adopted, the final goal of an enterprise is to improve its business performance and competition. As a company-wide incremental process of innovation, Continuous Improvement has become an important strategy for an enterprise to maintain manufacturing competition. In this paper, the performance of CI in Chinese enterprises will be evaluated based on the international investigation of CI. And the paper has a comparative analysis of the performances of CI in Chinese enterprises and foreign enterprises. Then the paper chooses the enterprises with good performance and uses Benchmarking to research the methods of CI. Finally the paper sums the suggestions of the performance of CI in Chinese enterprises. These suggestions provide reference to carry out CI in enterprises.
Method of Customer's Requirements Gain and Analysis
Authors: Shan Quan , Chen Yan
Published: February 2012

Modularity has been recognized as a vital factor to implement mass customization. To obtain the optimization project of modular design, Customer's Requirements must be gained firstly. There has relation between each Customer's Requirement. So, the gain technology of Customer's Requirements degree, which using investigate questionnaire, is expatiated in this paper. Then, the gray relation degrees between customer's requirements can be gained by gray correlation analysis. A questionnaire, which using the household hanging air-conditioning system as an example, is proposed in this paper. The result, which using gray system theory to analyze, demonstrates the feasibility of the proposed approaches.
Customer Requirements Driving NPD Method Based on Integrated CAX Technology
Authors: Lin Li , Luo Tian Hong , Ran Xian Sheng
Published: February 2012

A customer requirements driving NPD method is addressed. This study proposes a new method to elicit customers’ requirement, through which NPD team acquire product attributes and quality functional deployment. Customer requirements driving New Product Development Method addressed in this paper is based on integrated application of customer requirements elicitation, CAD, CAM, CAE technology. It makes STP strategy of NPD become more quickly and more effectively compared with the traditional method. This study finds that precise customer requirement elicitation contribute to NPD’ success, a better NPD performance can be achieved by customer requirements driving NPD method (CRDNPD). A case study of All Terrain Vehicle NDP is used to illustrate the new method. We believe that the proposed methodology will have a positive impact on the future new product development.
Preparation of Magnetic Chitosan-β-Cyclodextrin Polymer and its Adsorption for Thallium (III) in Aqueous Solution
Authors: Zhou Zhi Wu , Wang Jing Song , Guo Qing Wei , Xu Zhen Cheng
Published: February 2012

Magnetic chitosan bonded β-cyclodextrin polymer was prepared, and its metal ion binding was studied using the batch static tests for thallium removal. The results indicated that magnetic chitosan-β-cyclodextrin polymer (MCS-CD) showed a high efficiency for the removal of thallium, the experiment data fitted well to the pseudo second-order kinetic model, the maximum adsorption capacity of 2.154mgg-1 was obtained according to the isothermal data.
Modular Design of Mechanical Products Based on Module Family
Authors: Li Jun , Zhou Jing Kai , Li Qiang , Zhang Yu
Published: February 2012

At first according to several typical definitions this paper concludes the characteristics of the module, based on which the descriptive model of the module of mechanical product and the concept of the module family are proposed, and then the configurative model of the module family of the mechanical product is discussed, so is the modular design of mechanical products based on the module family. Finally, three methods of the modular design of mechanical products are summarized.
Field Experiment Study on Ventilation Characteristics of Block Stones Embankment in Qinghai-Tibet Railway
Authors: Bian Xiao Lin , He Ping , Wu Qing Bai , Shi Ye Hui
Published: February 2012

The forced convection in the blocky stone layer plays a major impact on the temperature field of embankment in Qinghai-Tibetan Plateau. Thus, a field test on air flow inside the blocky stone layer has been carried out to make clear the ventilation characteristics. The results show that pore-air velocity in embankment slope of following wide side is in well accordance with the external wind, and the temperature in sunny slope is higher than in shaded slope. The variation of velocity in sunny slope is larger than shade in summer, which is inverse in winter. The time of air flow through an embankment was calculated by the Bernoulli Equation, and the results show that the air can flow though the embankment in less than a minute, indicating the pore-air velocity in blocky stone layers is mainly influced by atmospheric wind field and blocky stone layers have good ventilation ability. So, it is advisable to consider the ventilation ability in analyzing the temperature field of block stones.
Wheel Loader Working Device Optimization Design Based on the Sensitivity Analysis
Authors: Li Xing , Chen Ya Zhou
Published: February 2012

As designing the loader working device related to multi-variables, multi-objective and it is a non-linear constrained complex optimization problem essentially so using traditional optimization method to design the loader working device is low efficiency. A new method is proposed which combines the sensitivity analysis with the genetic algorithms to reduce the design variables and to improve the optimization efficiency. The optimization mathematical model is established. The key design variables which have greater impact on the loader digging force can be obtained by the sensitivity analysis and then input into genetic algorithms to conduct an optimization. By using this method the result showed that the loader digging force can be increased by 5.9 percent on the premise of meeting the overall performance requirements of the loader.
Preparation of MgB2 Superconducting Thin Films at Low Temperature
Authors: Zhou Zhang Yu , Yang Fa Shun , Yang Jian , Wang Song , Fu Xing Hua
Published: February 2012

MgB2 superconducting thin films have been fabricated on Silicon (111) substrate in a two-step ex situ approach. The precursor boron film was deposited by chemical vapor deposition by using diborane as the boron source at 460°C．The Magnesium film with a thickness of about 380nm was deposited on top of the boron film by magnetron sputtering. The samples were then post-annealed in situ in argon atmosphere at 500°C for time range from 2.5h to 5.0h. The sample for optimized annealing time exhibits abrupt superconducting transition, with an onset temperature around 35K and a zero resistance temperature greater than 34K. The microstructures and morphological properties of the films were examined by X-ray diffraction (XRD) and scanning electron microscopy (SEM).
Research on Application of Damping Vibration Reduction Technology in Marine Gearbox
Authors: Han Jiang Gui , Qian Mei
Published: February 2012

The effect of vibration reduction is analyzed for viscoelastic damping layer of gearbox device. A viscoelastic material is added to the internal and external wall of the gearbox’s oil-pan. A finite element model is established, meanwhile the modal analysis, the dynamic response and structure noise is calculated. The influence of vibration performance by damped vibration reduction technology in the application of gear system provide scientific theory basis.
Multi-Objective Path Planning Model and Algorithm for Warship Evacuation
Authors: Liu Chong , Qiu Chang Hua
Published: February 2012

The aim of naval ship evacuation is to direct crewmembers form the dangerous cabins to mustering station or action station as quickly as possible, when the ship is likely to be attacked or on fire. While evacuating, the crew’s escape routes have to open various watertight doors or airtight doors, which will speed evacuation but it may also degrade the ship’s post-evacuation integrity. In the proposed the multi-objective path program model for warship emergency evacuation, in consideration of the conflict between the minimization of total travel time and the minimization of ship’s integrity. The multi-objective problem was converted into single objective problem by weighted method. The crew speed on each arc depends on the total number of evacuees traversing the arc at roughly the same time. We proposed a heuristic algorithm to solve the multi-objective time-varied escape route planning problem. Finally, a numerical example is presented to show the effectiveness and feasibility of this algorithm.
Optimization and Simulation of Portable Crane's Arm System Based on MATLAB
Authors: Zheng Xiao Liang , Li Ming Ding , Zheng Hua Rong , Chen Ding Fang
Published: February 2012

The arm system is the central part in the design of a portable crane. The purpose of this program is to assure that the load moves approximately along the path of the horizontal direction in the process of luffing, through the optimization of the bars’ length of the arm system. Using vectors in the mathematical model, we figured out the coordinates of the bottom point of the truck-beam according to the geometric relationships of the four-bar linkage. With the appliance of proper algorithm and the idea of visualization, we calculated the reasonable length of the bars in MATLAB and transformed the results into software ultimately. The design is suitable for different types of portable cranes, and the software is very convenient and can be used in engineering.