bluuebunny/crossref_metadata_2025 huggingface dataset:
A Simulation System for Grinding Based on Virtual Reality
Authors: Yu Tian Biao , Su Peng Cheng , Zhang Jing Qiang , Guan Peng , Wang Wan Shan
Published: August 2010

A grinding simulation system is developed based on the technology of virtual reality. Simulation theory based on virtual reality is introduced and architecture workflow and operation of the system is studied. With the system, simulation of grinding process of all kinds of materials can be done, influence law of grinding wheel parameters (abrasive grain sizes, bond materials, grinding wheel diameter, etc.) and process parameters (grinding speed, workpiece speed, axial feed workpiece materials, etc.) on machining quality of the workpiece can be analyzed, machining quality can be forecasted and optimization of grinding process parameters can be gained.
Wear Rate Predication for Steel Based on Regression Analysis
Authors: Yan Yu Tao , Sun Zhi Li , Zhu Tao
Published: August 2010

The wear experimental project on contact pressure, sliding speed and surface hardness was instituted by the uniform design method, the wear properties were investigated on a vertical universal friction/wear tester, the worn surfaces of specimens were observed by scanning electron microscope (SEM). The wear rate predication model was established by polynomial regression analysis, and the goodness of fit and the significance of influencing factors was verified. The results showed that the experimental efficiency was evidently increased, and the experimental cycle was shortened by the uniform design. It is found that the wear rate predication model established is reasonable and valid, and the impact of three factors on the wear rate is coupling effect. The main wear mechanism is abrasive wear and adhesive wear.
Research on Fault Diagnosis for Centrifugal Compressor Using Entropy-Based Fuzzy Gray Relational Analysis
Authors: Li Lan Yun , Yang Zhuan Zhao , He Zhi
Published: August 2010

. A novel fault diagnosis method for centrifugal compressor was proposed by using entropy- based fuzzy gray relational analysis (EF-GRA). Firstly, the minimize entropy principle (MEP) was used to subdivide all real-valued fault features and construct membership functions of fuzzy variables. Secondly, based on the gray theory, the fuzzy-gray relational coefficients (F-GRC) were calculated and the weighted fuzzy-gray relation degrees (WF-GRD) were obtained, so that the diagnostic result can be determined. Finally, a centrifugal compressor fault dataset was used to illustrate the proposed method, and the results show that it has strong engineering practicability and validity.
SH: A Novel Method for the Dynamic and Shortest Path Problem
Authors: Guo Ya Fei , Qin Zheng , Guo Rong Hua , Ji Lei
Published: August 2010

For the dynamic and shortest path problem, a novel algorithm SH(simulate human) is designed by simulating the process of our searching path in real life. The algorithm adopts the idea of heuristic search and integrates with the ant colony algorithm, in which the saved current path, the idea of “ask once every junction”, the bypassing barrier search and other some related definitions are proposed, as well as the ant colony algorithm is improved, so as to find the better solution and reduce the searching time. The experimental results show that the algorithm runs better than other existing methods. Moreover, it can find the shortest path or the approximate shortest one in a shorter time on road networks of any scales. Especially, SH algorithm is more effective for the large scale road network.
Fabrication of a β-TCP Nanomaterial and its Inhibitory Effects on Human Ovarian Cancer SKOV-3 Cells
Authors: Ma Xiang Dong , Wu Xiao Ming , Duan Hai Xia , Ma Xing , Fu Tao
Published: August 2010

Nanosized β-tricalcium phosphate (TCP) material was produced in this study using a wet precipitation method and characterized by transmission electron microscopy (TEM) and X-ray diffraction (XRD). Human ovarian sarcoma SKOV-3 cells were cultured and the influence of nanoscale β-TCP particles on SKOV-3 cell behavior was studied in vitro. As a result, β-TCP nanoparticles with average size of 100 nm were obtained. Cell growth of SKOV-3 cells was noticeably declined in the presence of β-TCP nanoparticles (200ng/ml). The distribution of cell cycle for SKOV-3 cells cultured with and without β-TCP nanomaterials was quite different. In G1 phase of cell cycle, the percentage of SKOV-3 cells cultured in the absence of β-TCP nanoparticles was significantly lower than that cultured in the presence of β-TCP nanoparticles (p<0.01). In S phase of cell cycle, on the other hand, the percentage of SKOV-3 cells cultured without β-TCP nanoparticles was noticeably increased compared with that cultured with β-TCP nanoparticles (p<0.01). Moreover, the expression of proliferating cell nuclear antigen (PCNA) in SKOV-3 cells cultured in medium containing 200ng/ml β-TCP nanopaticles was significantly lower than that in the cells cultured without β-TCP nanoparticles (p<0.01). In conclusion, the nanoscale β-TCP material synthesized in this study can exert anti-tumor effects on SKOV-3 cells through mechanisms of cell growth inhibition, downregulation of PCNA expression and cell cycle arrest at G1 phase.
Preparation of Nanocrystalline γ-Alumina Using Ultrasonic Technique
Authors: Sebayang Darwin , Ade Firdianto , Yanuandri Putrasari , Egi Agustian , Saryanto Hendi , Untoro Pudji
Published: August 2010

The γ-alumina powder is a potential material for washcoat application. This paper shows the preparation of γ-alumina using ultrasonic technique in order to obtain nanocrystalline of γ-alumina powder. The 50 gr of the γ-alumina powders was treated in the 250 gr ethanol solution using ultrasonic technique within 10, 20, 30, and 60 minutes, respectively. The process of sonication was set at the fixed frequency (18.520 kHz) and current of 2 A. Crystallite size was evaluated by using X-ray diffraction (XRD) data based with Scherrer analysis and Williamson-Hall method. The microstructural characterization of the γ-alumina powders was observed using Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDX) analysis. The result shows that the optimum of nanocrystalline size of γ-alumina at ultrasonic process for 30 minutes are approximately 4.80 nm and 29.50 nm with Scherrer and Williamson-Hall calculation, respectively.
Technical Parameter Research of High Purity Green SiC from Cutting Waste Mortar of Solar Silicon Wafer
Authors: Zhang Ming Xing , Chen Hai Yan , Yan Cui Ping
Published: August 2010

The green SiC (silicon carbide) powder, cutting fluid and pure Si (silicon) has the great recovery value in cutting waste mortar of solar silicon wafer. Nowadays, the critical technology of recycling SiC powder is classification technology in which the quality of recovery SiC powder is depended on classification precision. The self developed turbine air classifier (LNC-120A-2 type with two air classifier connected) was used in this experiment. The test dust is dry admixture of waste mortar containing SiC (JIS1200＃) through pretreatment. Through the orthogonal experiment, the optimum classification condition: the speed of first stage classifier is 1914rpm, the speed of second stage classifier is 3480rpm , the secondary air flow of second stage classifier is 13m3/h, the disperse pressure is 0.2MPa and the total system air volume is 1400m3/h. Under this condition, the classification precision of SiC powder is 85.73%, the particle size d50 is 9.571μm meeting the demand of JIS1200＃, the recovery efficiency is 89.2% and yield is 65Kg/h. Sometimes, the results show: the granule morphology of recovery SiC powder is basically some with standard SiC powder of JIS1200＃, meeting the effective cutting for silicon wafer.
Py-GC/MS Analysis on Biomedicine of Ether/Acetone Extractives from Eucalyptus camaldulensis Biomass
Authors: Qi Hong Chen , Peng Wan Xi , Wu Yi Qiang , Zhang Ming Long
Published: August 2010

Eucalyptus camaldulensis biomass has been widely used in fiber and pulp. However, this would result in serious water pollution and meanwhile bring a great waste of biological resources. Therefore, the ether/acetone extractives of Eucalyptus camaldulensis biomass were identified by Py-GC/MS. The main 350°С pyrolysis components were 7-Oxabicyclo[3.3.1]non- 2-ene,8-(4-methoxyphenyl)- 2,4,9-trimethyl- (7.1%), Indolo[2,3-b]quinoxaline, 1-fluoro(4.23%), etc. The main 550°С pyrolysis components were 7-Oxabicyclo[3.3.1]non-2-ene,8-(4-methoxyphenyl)- 2,4,9-trimethyl-(7.1%), Indolo[2,3-b]quinoxaline, 1-fluoro(4.23%), etc. And the main 750°С pyrolysis components were oleic acid(6.77%), 10,18-bisnorabieta-5,7,9(10),11,13 -pentaene(2.33%), 9,12-hexadecadienoic acid, methyl ester(2.12%), etc. So the ether/acetone extractives of Eucalyptus camaldulensis could be used as biomedicine.
The Effects of Nodularity Distribution on Vertical Configuration Mould for Automotive Ductile Iron Casting
Authors: Saman Alias Mohd , Abdullah Abdul Halim , Mohd Nor Mohd Asri , Idris Mohd Hasbullah
Published: August 2010

Mechanical properties of ductile iron casting are strongly inclined with metal matrix microstructure, graphite elements presence and impurities rate. Increasing in the number of graphite elements near to sphere shape (nodule), more superior mechanical properties will be realized. Automotive castings normally produced in mass production due to high demand; vertical moulding configuration is one of the best options for producing mass quantity automotive castings. This study aim to discover either the vertical moulding configuration will affects the nodularity properties distribution for different cavity position in the mold. In this study, ductile iron disc brake castings have been produced by in-mold Mg treatment using vertical parted molding method. Samples from different cavity position were taken and analyzed their nodularity distribution. Image processing computer procedure-Lieca was used to characterize the graphite morphology of the samples. The result shows that the different cavity position of vertical orientation disc brake casting produced dissimilar distribution of graphite. Higher position of cavity has higher nodule count and round graphite.
Numerical Simulation of Solar Ground-Source Heat Pump with Latent Heat Storage
Authors: Wang Fang , Liu Zhi Long , Li Zhong Jian , Zheng Mao Yu
Published: August 2010

Solar ground-source heat pump (SGSHP) system is unsteady when used to heating. Latent heat storage tank (LHST) was used appropriately in which phase change material (PCM) - CaCl2•6H2O was encapsulated in plastic kegs setting on the serpentine coil. PCM which was as controlling unit of the phase change heat transfer model were solved numerically by an enthalpy-based finite differences method and was validated by experimental data. In order to reflect the effect of the system, two days were chosen to compare the numerical results with experimental data. Inlet and outlet temperature of the water in the LHST, temperature of PCM and storage & emission heat of LHST were measured. The trends of the variation of numerical results and experimental data were in close agreement. Numerical results can reflect the operation mode of the system very well.
Simulation Technologies for Tamper System of Asphalt-Paver Based on AMESim
Authors: Luo Tian Hong , Gan Xin Fu , Luo Wen Jun
Published: August 2010

Tamper mechanism is one of the most important parts in all of Asphalt-pavers. In this article, the mathematical model of the tamper system has been established and the stability of the system has been analyzed by using Matlab. According to the operating principle of tamper system of Asphalt-paver, the simulation model of tamper system of Asphalt-paver has been established by using AMESim. The main parameters of the model were set, and then, the simulation results were analyzed, which show that the system is stable and the dynamic performance of system will be improved, when accumulator and PID controller were equipped. Besides, the tamping frequency of hammer is very important to the performance of system. When tamping frequency of hammer over 20HZ, the performance of system will go bad.
Effects of Microstructural Evolution and Mechanical Properties on 440C-TiC Composite Steel by HIP Treatment
Authors: Chang Shih Hsien , Tang Tzu Piao , Huang Kuo Tsung , Chen Jhewn Kuang , Liang Cheng
Published: August 2010

The aim of this paper is to investigate the effects of HIP treatment on 440C-TiC composite steel. In this study, AISI 440C stainless steel powders were added with different amounts of TiC powders (25, 33 and 40 wt%), the composite materials were sintered at 1473 K, 1573 K, and 1673 K, followed by different pressures of HIP and HIP plus heat treatment. HIP treatments were used 120 and 150 MPa at 1523 K 1 hour. Experimental results showed that the microstructure of matrix had small needle structures after HIP treatment, which were effective in improving the hardness and strength. Furthermore 440C-TiC composite steels which were added with 25wt% TiC powder after 1673 K sintered and high pressure HIP treatments, TiC powders were uniformly dispersed in the high chromium stainless steel matrix were observed and consequently possessed the higher hardness (HRA 85) and highest TRS (1213 MPa).
Research on Velocity Field and Dynamic Pressure Effect of Oil Film of Hydrostatic Center Rack
Authors: Shao Jun Peng , Yin Chao , Wu Bo , Wang Zhong Wen , Huang Zhi , Li Chong
Published: August 2010

Hydrostatic center rack is an open type hydrostatic supporting equipment. In this paper, taking oil film of middle pillow of hydrostatic center rack as the research object, the velocity field, pressure field and dynamic pressure effect are simulated based on CFX finite element analysis software. The velocity distribution, pressure field and the relationship curve between spindle speeds and dynamic pressure are obtained. The simulation results show that there is negative pressure at the entrance of spindle rotation direction. When the spindle speed is less than 360r/min, the dynamic pressure effect is not obvious and at the steady state basically. Above this speed, the dynamic pressure effect increases significantly as the spindle speed rises. The simulation results can reflect the flow law of internal flow field of the middle pillow. It provides a theoretical basis for the structure optimization of hydrostatic center rack and open type radial sliding bearing in engineering practice.
Physical Modeling of Cylinder Upsetting with Plasticine for Validation of FEM
Authors: Yu Suo Qing , Zhao L.P. , Wang A.B. , Lin H.C. , Chen J.J. , Yao G.D. , Ni Li Yong
Published: August 2010

Physical simulation was conducted on the process of upsetting cylinder between flat platens by using colorful plasticine. The results of the physical simulation are basically consistent with rigid-plastic finite element analysis, which supports the rigid-plastic mechanical model for the cylindrical billets whose height-diameter ratio are greater than 1. Further physical simulation is conducted on cylinders upsetting between platen and supporting ring. The experimental method provides a reference for physical simulation of large deformation.
Study on Smelting Metallic Magnesium by Siliconthermic Reducing Method and its Reaction Kinetics
Authors: Gao Feng , Sheng Wang Guo , Yi Liu Yun , Ge Ying Xin , Min Wang Zhu
Published: August 2010

The metallic magnesium by siliconthermic reducing method was studied by magnetite as raw materials. The Mg reduction rate, such as reduction temperature and time, Si-Fe added mount, mineralize CaF2 added, briquette pressure, were discussed by experiments. Through siliconthermic reducing process analyzed, the result showed reduction process was in line with three-dimensional phase boundary reaction D3 model and kinetic equitation were expressed as , with an apparent activation energy 313.58 KJ/mol, frequency factor 2.7×106 s-1.
Study on Flexural Fatigue Performance and Damage Laws of Hybrid Fiber Reinforced Concrete
Authors: Chen Meng , Lu Zhe An , Ren Zhi Gang , Zou You
Published: August 2010

The flexural fatigue experiment of plain concrete (C) and Steel - Polypropylene Hybrid Fiber Reinforced Concrete (HFRC) is carried out to study the flexural fatigue performance and damage laws under cyclic loading. With the strain gauges pasted on the bottom of the specimens, the strain is collected by dynamic acquisition instrument.We obtain the fatigue life and the maximum strain - cyclic ratio ( ) curves by counting and analyzing the results of fatigue experiment ,which move forward a single step for analysis of fatigue damage laws of HFRC. The study would provide reference for flexural fatigue properties of HFRC.
Design and Study of Lapping Device in Large Caliber Spherical Surface Valve Core
Authors: Li Tie Cheng , Ren Cai Xia , Wang Zong Cai , Qiu Chao , He Wen Ping
Published: August 2010

A special grinding device is designed to solve the problems of the shape precision, surface quality and grinding efficiency. The device is based on the sine generator and triaxial speed to achieve the ideal Grinding trajectory. The accuracy of grinding in spherical valve core & surface quality is assured and improved by three-dimensional elastic support, pressurized floating contact and auto centering device in core and lapping tools. The grinding efficiency is highly enhanced by using the lateral and vertical speeding workpiece installration and the automatic control. The device is worth widely being applied to achieve a good large diameter hemispherical workpiece grinding.
Pyramid Shaped Pyrolysis Flame Catalyst Synthesis of Carbon Nanofibers
Authors: Sun Bao Min , Ding Zhao Yong , Guo Yong Hong , Xu Bing Hao , Liu Yuan Chao
Published: August 2010

Pyramid shaped pyrolysis flame is a new method for carbon nanofibes (CNFs) synthesis. Oxy-acetylene flame outside the frustum of pyramid shaped reactor provides the necessary high temperature environment, while CO is used as the source of carbon, iron pentacarbonyl (Fe(CO)5) as the source of catalyst precursor in reactor. Inside, the mixture of CO, H2, and Fe(CO)5 will burn incompletely after initial reaction under high temperature. Inserting a sampling substrate into the incomplete burning flame can gain CNFs. Field emission scanning electron microscope (FE-SEM) was used to illustrate the results of experimental. By adjusting the distance between the oxy-acetylene flame jet and the synthesis zone, studied the effects of pyrolysis and synthesis temperature. The preferable pyrolysis temperature in experimental is about 693°C while the synthesis temperature is about 595°C, and preferable synthesis temperature is about 535°C while pyrolysis temperature is about 1000°C. It can be also concluded that when the synthesis temperature is high (595°C, comparing with 535°C), preferable pyrolysis temperature is low (693°C, comparing with 1000°C), vice versa. Effects of sampling substrate were also studied. Using 304 stainless steel wire as sampling substrate can not gain CNFs, while 201 stainless steel plate can gain straight and uniform, and silicon chip can gain curly ones.
Forming of 2A12 Aluminum Alloy Double Curvature Thin-Wall Part Based on the Hill (1948) Anisotropic Yield Criterion
Authors: Zhang De Hai , Liang Jin , Guo Chen , Li Yan Qin , Guo Zhe
Published: August 2010

In order to solve the existing problems such as the less-plump corners and wrinkle during the forming process of a double curvature thin-wall part. Material parameter formulas are calculated based on Hill 1948 anisotropic yield criterion and flow rule. The material mechanical property parameters of 2A12 are obtained using uniaxial tensile experiment. Single factor test method is used and LS-DYNA is applied to conduct finite element analysis. So the influence law of holding force, blank shape and blank size imposed on the finite element model are calculated in sequence. On the basis of these laws, that the blanking force, blank dimension and blank shape are decided. Stamping die for the experiment model is designed and made, deformation measurement technology of coordinate grid circle is used to carry out strain analysis. From the comparison result between experiment and simulated data, it can be seen that Hill 1948 yield criterion and flow law can better solve the formability of 2A12 sheet.
Simulation Study on Combustion and Emission Process of High Proportional of DME-Diesel Mixed Fuel
Authors: Zhu Jian Jun , Li Xiao Fen , Wang Tie
Published: August 2010

With the ESE module of FIRE software, this paper establishes the diesel engine model of 4100, and verifies the correctness with the test result. Based on this, the paper carries on a simulation on three high proportions of DME-diesel D65, D75 and D85, and makes a contract with diesel on the mean pressure, mean temperature, mass fraction, accumulated heat release, as well as the mass fraction of NOx and soot. The result shows that the higher proportional, the lower mean pressure in-cylinder. Also the result shows that NOx growth will come to a “freezing period” when it comes to a certain temperature, while soot growth is growing first and oxygenated later, and with the increase of DME proportion, NOx grows later and its mass fraction is lower. Besides, the mass fractions of soot of three kinds of mixed fuels are far below diesel’s, D85’s is the lowest.
Research on the Supporting Technology for Design, Process and Manufacturing Integration
Authors: Mi Xiao Zhen , Zhai Feng Xiang , Zhao Wen Zhong
Published: August 2010

According to integration requirements of design, process and manufacturing in railway vehicle manufacturing enterprises, an integration solution centered at material quota and key technologies are proposed, which includes the data integration technology between PDM, CAPP, FastCut/Nest, ERP on the server layer; the Data Pre-process technology for design and process integration; the automatic nesting optimization technology meeting practical production requirements; the method to calculate material quota based on nesting optimized layouts; and the sharing of general NC codes. Considering automatic nesting optimization and material quota computing, a solution for split/combination data pre-processing and post-processing is proposed and implemented. And practical production conditions are taken into account in the nesting algorithm. All these technologies and solutions support the integration centered at material quota for design, process and manufacturing.
Design and Study of Automobile Air Condition Control System Based on CAN Bus
Authors: Zhang Jin Dong , Qin Gui He , Zhou Xu , Xu Bing , Chen Zhao Xia
Published: August 2010

In order to improve the reliability and comfortableness of driving, network used in automobile air-condition control system have been studied in this paper and we also designed a automobile air-condition control system based on CAN bus. The control system can improve the reliability of driving, it interconnects the air-condition system with other automobile CAN buses, which accelerating the automobile integration process. To optimize the control of vehicle air-condition system, we can improve and enhance the performance of conventional automobile air-condition, it is the key technology with a good prospect in the turning of electronic automobile control to the advanced stage.
Appling Fuzzy Logic for Optimization Formulation of Sapphire Precision Grinding
Authors: Wang Xiao , Lu Cong Da
Published: August 2010

Fuzzy logic is a mathematical theory of inexact reasoning that allows modeling of the reasoning process of humans in linguistic terms, and it is an effective method approved to deal with the fuzzy objects in many areas of engineering application. The purpose of this paper is to explore the relationship between grinding process parameters and surface quality parameters of sapphire wafer by using fuzzy theory and to obtain optimization parameters to enhance the processing efficiency and higher the surface quality of the sapphire in ultra-precision grinding. This paper sets up the triangular fuzzy logic model between processing parameters and surface quality parameters for precision lapping of sapphire, and 2 groups of optimization parameters are selected. Finally, the experimental results verified that the optimization parameters of sapphire lapping obtained by using fuzzy logic which can improve the grinding efficiency and the surface quality of sapphire.
Research on Dynamic Intrusion Detection Model Based on Risk Coefficient
Authors: Wei Zheng , Hou Jun Yi , Tan Hua , Guo Guang Nan
Published: August 2010

Intrusion detection technology is a kind of network security technology that can protect system from attacks. Based on the definition of system call risk coefficient, the paper brought out a system risk coefficient based dynamic intrusion detection model. Using the model, the drawbacks of traditional intrusion detection method based on system call was solved, which speeds up detection process and decreased false rate and error rate. It can also effectively identify error operations or users. The experiment result also proves the effectiveness and efficiency of the method.
Synthesis and Properties Epoxy Resin/Mesoporous Silica-Sepiolite Nanocomposites
Authors: Jia Qing Ming , Shan Shao Yun , Jiang Li Hong , Wang Ya Ming
Published: August 2010

Size, shape and processing of the inorganic fillers are important for improving properties of nanocomposites. In this paper, a novel nanofiller containing mesoporous silica(MS) and fibrous sepiolite(SE) was prepared by in situ deposition method. EP/MS-SE nanocomposite was obtained by adding MS-SE to epoxy resin(EP) matrix. Morphologies and mechanical properties of the new ternary nanocomposite were investigated. For purpose of comparison, the corresponding binary nanocomposites, i.e., EP modified with either MS or SE, were tested as well. The test results of mechanical properties show that MS improves the strength of EP and SE obviously enhances the toughness of EP, but oM-MS exhibits synergistic effect on toughening and reinforcing of EP at the same time. Dynamic mechanical analysis revealed that the glass transition temperature and storage modulus of the EP/MS-SE nanocomposite was higher than those of pure EP.
The Effect of Different Lubricant Mixture and the Method of Preparation on Properties of Effervescent Tablets
Authors: Asgarirad H. , Honary S. , Ebrahimi P. , Ruhi M.
Published: August 2010

Various mixtures of different lubricants and preparation methods were investigated in order to find the best lubricant mixture for effervescent tablets. Methods: Lubrication effectiveness in two methods of granulation of standard effervescent formulation was tested by using mixtures of various percents of different lubricants. L- Leucine, Polyethylen glycol 6000 and SLS were used as lubricant. The hardness, disintegration time and abrasion for tablets which produced from each formulation were determined. All formulations were investigated for transparency and tastelessness after their complete disintegration of tablets in 200 ml of water. Results: The results show the best lubrication results were obtained by using a mixture of 2% w/w of L- Leucine and 3% w/w of PEG 6000 by ethanol granulation method.
Research on Virtual Enterprise Risk Control Based on Optimization
Authors: Wang Neng
Published: August 2010

Virtual enterprises not only help to improve the competitiveness of enterprises but also increase the risks that enterprises face. This paper studies the methods and indexes for enterprise risk evaluation and steps of virtual enterprise risk identification and adjustment, constructs a local optimization model and global optimization model of virtual enterprise risk based on minimum risk loss and finally gives a risk control framework of virtual enterprise.
Virtual enterprise is also called virtual organization or dynamic alliance, etc, and it refers to a dynamic alliance of multiple enterprises taking information network technology as support to integrate their respective core competences and resources for catering for fast-changing market opportunities. Virtual enterprise brings advantages of flexibility and quick reaction, etc, but we can not neglect its risks and losses brought by the risks due to uncertainty of external market environment and its complexity and even these risks and losses will lead to its abortion. Under the circumstances, we need to carry out effective identification and control of virtual enterprise risks to ensure the successful establishment and operation of virtual enterprises.
Study on Electron Shopping Website Based on ASP.NET
Authors: Li Rui Qiang
Published: August 2010

As the internet and related technology matured gradually, it indicates a new era of electronic business. This article is developed with ASP and Access Data Base technology, including the realization of the design of shopping website home page module and design of customer and Merchant function module; the develop and management of website backstage function, including management of registered customers, merchants and administrator user, setting to the management of the viewing, modification and publication of products. Detailed research is also made to the development and design of the Data base. The electronic shopping website built based on ASP.NET is B2C and C2C type electronic business website in combination. The merchant shop keeping module is clear and easy to operate. The customer shopping trading procedure is convenient and easy to understand. These are the trend of the current e-business development. As the information industry develops quickly, internet and related technology gradually matured. These all promote the electronic business development, and acknowledged people of this new industry. E-business is applied to many areas to different extend, bring new opportunity to all countries worldwide. In this article, the electronic business model is mainly targeted on the synthesis of C2C (small scale, small amount trade person to person or small service to person) and B2C (adding commodities at backstage, and trade at front stage). The e- business platform discussed is mainly to provide the buyer and seller a only trade platform, to enable the seller to publish commodities selling online, and the buyer to choose the commodities to purchase. The website needs to guarantee the authenticity of the information published by both buyers and sellers, along with safe, convenient shopping and trading procedure. Currently the website hopes to attract large amount of user with free service. Later special service will be promoted to make profit, improve the e-business, win user’s trust, and increase trade amount. However, there are some question to face in current electronic business websites, like the bottle-neck of online trade, only honest trade and trading amount both increase will draw more companies to take part in electronic business websites, and lead to develop and prosperity of this business.
The Design and Study on Portable Pipe Thread Shaping Machine
Authors: An Mei Ling , Du Yan Gui , Mu Xi Qing
Published: August 2010

By analyzing and comparing several possible proposals of structure for transmission device of pipe thread shaping machine, the non-axis 2-class gear transmission device is designed innovatively, and the tube clamping device is also designed by using principle of differential screw. At last, a portable thread pipe shaping machine is designed and manufactured, which can process both linear and non-linear round pipe threads. The whole machine, with small number of parts, is compacter, smaller and lighter so that it is easier to be moved.
Flow Stress Correction of AZ80 Magnesium Alloy for Deformation Heating at High Strain Rates during Hot Compression
Authors: Lou Yan , Li Luo Xing , Luan Na
Published: August 2010

Accurate description of the material flow stress behaviour is an essential requirement for FEM simulation of metal forming processes. In the present hot compression tests of AZ80 magnesium alloy were performed on Gleeble 3500 at strain rates between 0.01-50s-1 and deformation temperatures between 300-450°C to determine the flow stress data of the AZ80 magnesium alloy. It was noticed that with increasing strain rate, deformation heating become more pronounced since there is no time for heat escaping during hot compression tests. Thus, a flow stress correction for deformation heating at high strain rates was carried out for the calculation of the constants of constitutive equation. Validation tests were then performed. Good agreements between the predicted and measured values in extrusion pressure were achieved.
The Application of Numerical Analysis in the Optimization of Deformation Resistance Model
Authors: Du Tai Hang , Gao Jie
Published: August 2010

Aimed at the problem that the deformation resistance can’t be measured in the cold rolling processing and it influence the precision of rolling force directly , propose the secant method to calculate the non-linear equation of deformation resistance. Solve the high-level non-linear equation with the iteration calculation, in which the deformation resistance is the independent variable, to improve the calculation precision of the deformation resistance and rolling force. It is proved that the secant method has less iterations, simpler calculation and smaller relative error, which has a vital meaning in improving the accuracy of rolling force.
Pressure Field Analysis of Continuous Rotary Electro-Hydraulic Servo Motor Based on ADINA
Authors: Wang Xiao Jing , Yang Xiao Dong , Shao Jun Peng , Jiang Ji Hai
Published: August 2010

In order to improve the low speed stationary of continuous rotary electro-hydraulic servo motor and avoid the pressure impact in the sealed cavity during the oil distribution, based on fluid and solid interaction theory, this paper adopted ADINA to analyze the pressure field distribution of sealed cavity in certain radial and axial gap, the computed model of the motor was established, and the pressure change of sealed cavity under the given dimension of the buffer groove was analyzed. The result shows that the pressure changes stably and buffer groove’s dimension is reasonable, which lays foundation for the structure design and experimental research of large displacement servo motor and improve the low speed performance of continuous rotary electro-hydraulic servo motor.
Study of the Emergency Logistics Based on GERT
Authors: Lin Lu
Published: August 2010

Disaster, emergency and epidemic diseases occur often bring huge losses, these losses in large part due to the loss of emergency logistics after disaster. So how to schedule schemes within shortest time in unpredictable situations, sent emergency resources to emergency locations within the shortest time is the key. According to the principle, GERT function, moment generating function, flow chart of theory and mason formula, then, combined with examples, construct an emergency distribution model. By calculating, distribution probability of success for each line and risk probability, the distribution of time and variance were achieved, then, analyze the defects in the model and areas in which need of improvement, and finally according to the defects put forward the improved solution.
Research of Pore Structure of Phosphoaluminate Cement Paste Using Nitrogen Adsorption Isotherm
Authors: Zhang Ming , Ding Zhu , Liu Peng , Wang Ming Ke , Xing Feng
Published: August 2010

Phosphoaluminate cement (PAC) sets quickly and develops high early strength. As a novel cementitious material, its hydration mechanism and microstructure are more complex than ordinary cement. Based on nitrogen adsorption isotherm method, investigated characteristic of adsorption isotherm of PAC paste, adsorption loop and pore distribution at different hydration period with various W/C ratio, results show that adsorption and desorption isotherm are tight relate to pore structure and pore distribution. In addition, the study analyzed the scope of application of nitrogen adsorption isotherm method on investigating pore structure of cement paste.
Dynamic Vehicle Routing Problem and its Algorithm Analysis
Authors: Lin Lu
Published: August 2010

Based on systematically illustrating the current research of dynamic vehicle routing problem and one-off optimization strategies, the paper takes dynamic vehicle routing problem with time window as the study object, proposed a new INTER-SQM dynamic programming strategy to optimize the traffic path of moving vehicle, which highlights the robustness of INTER-SQM strategy, the corresponding ant colony optimization is presented also. Random test compares the operating performance of various optimization strategies in different strong dynamic degrees scenario, discusses the characteristics of the INTER-SQM strategy and points out the research direction of dynamic vehicle routing problem.
The Cooperative Organizational Modes for Technological Exploitation: Evidence from Chinese Heating Ventilating and Air Conditioning Industry
Authors: Wang An Yu , Li Jun
Published: August 2010

The Aim—this paper is to investigate whether there is a certain kind of organizational modes for cooperative technological exploitation. In recent years, an important objective of cooperative R&D alliances built by independent organizations is to explore a new market or to exploit the existing one. Whether the objective can be achieved or not is tightly related to the governing efficiency of the R&D alliance, and the latter in turn depends on the suitable organizational mode. The Method--this paper selects 39 Heating Ventilating and Air Conditioning companies listed in Shanghai and Shenzhen Stock Exchange according to some certain criteria, and collects their collaborative R&D cases since their listing, and then analyzes the impact of technological exploitation objective to the selection of cooperative R&D organizational modes in light of LOGIT model. The result—this paper shows that the equity mode is prior to the non-equity one no matter the R&D alliance is to explore a new market or exploit the existing market.
Modeling of Sensor Assignment in Cooperative Target Tracking
Authors: Zhu Peng , Zhao Ming Sheng
Published: August 2010

Sensor assignment is an important issue in the collaborative tracking, a good sensor assignment method can improve the efficiency of collaborative tracking. This paper proposes a filtering based sensor assignment modeling method. The method uses relation of set theory to establish the sensor target assignment scheme model, combines the sensor assignment scheme with the filter, regards each sensor detect program as an filtering, and chooses the best scheme according to error upper limit of filtering. This modeling method does not need assumption of statistical characteristics of the target.
Research of Earth Berm and the Simplified Analysis
Authors: Ying Sheng Bin
Published: August 2010

Earth berms are often used for the temporary support of embedded retaining walls,but there is a lack of information concerning the factors that influence their behaviour. It is shown that earth berms will probably be more effective in reducing soil and wall movements than an increase in the depth of wall embedment.
Log-Based Network Security Audit System Research and Design
Authors: Qing Xia
Published: August 2010

This paper presents a security protection model of logs from the aspect of the system security architecture and technical feasibility, describes complete system architecture according to the system design objects, and gives the design process of each module in this system. Finally the proposed algorithm for association rules mining is experimentally tested in the network security audit system and there are satisfactory results.
Research on Gird Task Scheduling Based on Ant Colony Algorithm
Authors: Qi Chen , Ming Hou
Published: August 2010

Combining with the advantages of ant colony algorithm to solve optimization problem, this paper designs a grid resource allocation model and task scheduling system based on ant colony algorithm. The algorithm can not only locally update for the pheromone in the allocation of grid computing resources, but also can entirely update for the pheromone after the completion of grid computing resources. Experimental results show that the ant colony algorithm can effectively achieve a reasonable task scheduling and load balancing, its application in the task scheduling in grid environment is very successful.
Manufacturing Technology of Strengthened Poplar Veneers
Authors: Zhu Xiao Dong , Wang Feng Hu , Cao Jun , Sun Jian Ping
Published: August 2010

Three mixed liquids, Styrene, Methylmethacrylate and Vinyl acetate were used to soak poplar veneer to obtain strengthen poplar veneers. The optimal molar ratio was fixed on 1:2:1.Soaking and polymerization technology were obtained as pressure 0.4Mpa, packing time 60 minutes, polymerization temperature 80°C, polymerization time 6 hours, cobalt naphthenate 2%, zinc chloride 6%, and azobisisobutyronitrile 3%. The impact of high temperature on the conversion was significant in the chosen level, other factors on the conversion rate was not significant.
Investigation of Core Node Separation and Crush
Authors: Yu Fen , Leonard Shi , Yang Fei Long
Published: August 2010

The causes of the honeycomb core node separation/core crush defects of fiberglass sandwich panel is analyzed. The porosity of skin and leakage of vacuum bag under high-pressure curing environment are identified as root causes based on the analysis of historical data and designed simulation testes, and approved by statistic analysis calculation also. The relationship of core thickness and the opportunity of the defects appearing are discovered by tests.
Cutting Tool Edge Temperature in Dry Hard Orthogonal Cutting AISI D2 Tool Steel with CBN Tool
Authors: Tang Lin Hu , Huang Jian Long , Xie Li Ming , Luo Wen Cui
Published: August 2010

The influence of cutting conditions on temperature of CBN cutting tool edge during dry hard machining of hardened AISI D2 tool steel (62±1HRC) is investigated in this paper. Measuring cutting tool edge temperature with experimental methods is time-consuming and diseconomy in dry hard machining. In this paper, Johnson–Cook model is utilized to propose finite element (FE) orthogonal cutting model. The FE model is properly calibrated based on the comparison between experimental resultant forces obtained from literatures and simulated resultant forces. Then, the FE model is utilized to predict influence of cutting speed and depth of cut on cutting tool edge temperature in dry hard machining hardened AISI D2 tool steel. As shown from this investigation, the maximum temperature in the secondary deformation zone is a little lower than that in the rake face of tool tip. And maximum temperature in high-temperature zone is in the range of 984-1065K.
A Methodology for Idea Generation in Sustainable Product Design
Authors: Wang Jun Feng , Yu Sui Huai , Chu Jan Jie , Qi Bin
Published: August 2010

Sustainable product design has become the tendency of the product design because the degradation of the environment. However, there are no effective methodologies or framework designers and developer eager to. This paper base on the soft system methodology present a methodology which is effective to the idea generation phases in sustainable product design process. From the need identification to the idea generation, sustainable product design criteria and relationship between it and customer requirements, 39 engineering parameters, 40 inventive principles were use in the methodology. An example is illustrated to show the process of this work flow, and the result show the effectiveness of the methodology.
Experimental of Energy Dissipation Characteristics of Metal Rubber
Authors: Gu Cheng Zhong , Wu Xin Yue , Zhang Ping Hao
Published: August 2010

The metal rubber is a kind of material for vibration control. In this paper, experimental research on characteristics of energy dissipation of metal rubber is exploited, and the relation between metal rubber stiffness and the amplitude of relative density and load. The relative between relative density and characteristics of energy dissipation is researched, in the excitation of displacement and load respectively. By comparing variation of the deformation and load with time, we found that the cycle of deformation and load is the same, but the deformation is still lag behind load. The research provided a basis for the application of metal rubber.
Effects of Low Temperature and Hot Pressure Molding Process Conditions on Unidirectional C/C Composites
Authors: Qiao Zhi Jun , Liu Xiu Jun , Li Tong Qi , Hu Zi Jun , Wan Ju
Published: August 2010

Under low temperature and hot pressure molding process, the unidirectional C/C composites is prepared with PAN-based carbon fiber and AR-mesophase pitch. The effects of The heating program, heating time, the carbon fiber content, the temperature of pressure starting and pressure value on prepared sample are investigated. The morphology of C/C composites preform were characterized by polarizing optical microscope (POM). The results show that the optimization conditions are as follows: 60% of the carbon fiber content, 9h from 350°C to 550°C of heating time and the pressure of 44MPa at 450°C. The density of C/C composites compact preform is up to 1.43g ·cm-3 under the optimization condition.
Study on the Effect of Value of the Current on Synthesis of W-C-Co Composites under an Electric Field
Authors: Yang Song , Yi Yang , Jian Liu
Published: August 2010

Using Gleele-1500D thermal simulation instrument, the effect of value of the current on synthesis of W-C-Co composites was investigated. It was shown that the nature of combustion products depended on the magnitude of the current intensity and the electric field was not only providing the Joule heat for a compact, but also accelerating the diffusion among atoms in the synthesis process. X-ray and microscopic analysis of combustion products suggest that the solid state reaction takes place at a relatively lower temperature by passing through the samples with current intensities between 20000 A and 30000 A. Moreover, as the current increases, the TTE becomes lower. At the same time, the relative strength of WC diffraction peaks in XRD diagram increases while that of W2C decreases.
Research on Electro-Hydraulic Load Simulator Based on Building Model of Flow Press Servo Valve
Authors: Shao Jun Peng , Li Jian Ying , Wang Zhong Wen , Han Gui Hua
Published: August 2010

The model of flow press servo valve is built in this paper, during building the model, the author emphatically analyses the flow equation and force (torque) balance equation of every part of the valve, at the same time, all levels sub-models are organic combined according to power flow direction, signal flow direction of elements and causality, then we get the bond graph model of the flow press servo from this way. Adapting flow press servo valve and flow servo valve to concurrently control load system has its great advantage in restraining the superfluous force of the electro-hydraulic load simulator system, the performance such as load precision of system is enhanced greatly according to this method. Based on the system bond graph model, and by comparing the simulation curves and experiment curves, we can know that the simulation curves basically tally with the experiment curves, the bond graph models are validated right, which are flow press servo valve bond graph model and double valves concurrently control the electro-hydraulic load simulator system bond graph model. Simultaneity, the bond graph models in this paper take on generality, they are can be used on other aspects, such as other valve controlling cylinder system simulation, design and control strategy theory research.