bluuebunny/crossref_metadata_2025 huggingface dataset:
The Height Amplitudes of Surface Roughness Based on Area-Direction Character and Relative Assessed Indexes
Authors: Wang Hong Cai , Wang Yang
Published: February 2012

To study the relationship among the height amplitude of surface roughness , assessed area and assessed direction, the height amplitudes SRa, SRq, SRsk and SRku based on area-direction character are defined in the paper. And on the foundation of these parameters, relative assessed area indexes, assessed direction indexes and assessed total indexes are established. SRa, SRq, SRsk and SRku are the natural extension of 2D height amplitudes Ra, Rq, Rsk and Rku. They are different from 3D height amplitudes Sa, Sq, Ssk and Sku. They provide an evidence to study the quantitative relationship among surface roughness, assessed area and assessed direction. Relative assessed area indexes, assessed direction indexes and assessed total indexes can be used to assess the distribution situation of height amplitudes of surface roughness related to area, direction and entireness.
Retained Austenite Amount Determination Comparison in JIS SKD11 Steel Using Quantitative Metallography and X-Ray Diffraction Methods
Authors: Su Yang Yu , Chiu Liu Ho , Chuang Tao Liang , Huang Chien Lung , Wu Cheng Yen , Liao Kuan Chueh
Published: February 2012

This research compares the difference in determining the austenite amount in SKD 11 tool steel using the micrographic method as opposed to the X-ray diffraction method. Calculating the amount of retained austenite in tool steel using X-ray diffraction analysis requires first taking off the primary carbide content. By etching the SKD11 specimen using Beraha’s CdS reagent, the retained austenite, martensite and carbide are shown as white, red and blue regions in the microstructure, respectively. With quantitative metallography, the retained austenite can be distinguished as separate micro-constituents and properly counted. However, the calculated values are lower than those acquired from the X-ray diffraction. It is more accurate to evaluate the amount of retained austenite with carbide by X-ray diffraction analysis.
Properties Evaluation of Polymer-Free Fluid for Fracturing Application
Authors: Deng Qiang , Xu Jing Fang , Gu Xue Fan , Tang Ying
Published: February 2012

A new and easy-to-prepare, surfactant-based polymer-free fluid, CTAB-SA, consists of etradecyl trimethyl ammonium bromide, cetyl trimethyl ammonium bromide and octadecyl trimethyl ammonium bromide with salicylic acid is described. The properties as a fracturing fluid were evaluated with regard to viscoelasticity and proppant carrying capability. The results showed that these water gels have strong proppant-carrying capacity and high viscoelasticity, and the best performance was obtained from the gels derived from octadecyl trimethyl ammonium bromide with salicylic acid. The viscoelasticity of these gels were increase with the quality ratio of ammonium bromide to acid.
The Impact of Anneal on Electromigration of Copper Interconnect and the Optimized Anneal Technology Study
Authors: Du Ming , Ma Pei Jun , Hao Yue
Published: February 2012

The theoretical and experimental work is executed for study the impact of anneal on the grain size, electromigration (EM) reliability of copper (Cu) interconnect system, and subsequently find the optimized anneal condition. EM accelerated failure tests are carried on the Cu interconnect samples with 0.2μm line width, which are produced at different anneal conditions. It is shown that anneal can lead the grains to grow to become larger, and lessen the EM diffuse path. As a result, the EM diffuse active energy (Ea) of Cu interconnect is enhanced, and the ability against the EM of Cu interconnect is improved. By comparing the EM character of Cu interconnects produced at different anneal conditions, results can be obtained as below: the anneal time should be maintained 40 minutes at least in order to achieve fully anneal and excellent ability against the EM; the anneal temperature should be set about 350°C approximately, because high temperature (beyond 400°C) anneal can induce the other reliability issues, which will have a strong negative impact on the EM reliability. The results in this paper are significance for Cu interconnect technology optimize and are beneficial to improve the EM reliability of the Cu interconnect system.
Surface Properties and Selenate Adsorption of Hydroxyiron-Vermiculite Complexes
Authors: Wei Shi Yong
Published: February 2012

Hydroxyiron-vermiculite complexes (Fe-Vermiculite) were prepared and identified using X-ray diffraction (XRD). The surface properties and selenate adsorption characteristics of Fe-Vermiculite were investigated. The specific surface area, surface fractal dimension D value and the pH value of the point of zero charge (pHPZC) of vermiculite were 287.19 m2/g, 2.14, and 2.87, respectively, and those of Fe-Vermiculite were 312.48 m2/g, 2.59, and 5.74, respectively. At pH 5.5, the maximum adsorption capacities (qmax) for selenate of vermiculite and Fe-Vermiculite were 4.36 and 9.12 mg/g, respectively. Langmuir isotherm was very suitable for describing the selenate adsorption of vermiculite (R2 =0.993), and Freundlich isotherm could fit the adsorption data for selenate by Fe-Vermiculite (R2 =0.981).
Design of a Anti-Theft Alarm Monitoring Circuit Based on Mobile Phone
Authors: Long Guang Li
Published: February 2012

For to steals, robs, and so on accidents to carry on the effective monitor and the warning, a burglar alarm monitoring circuit is designed by using mobile phone, which utilizes a pyroelectric infrared sensor to detect the human body moving signal, when someone moves in a monitoring region, pyroelectric infrared sensor can detect the human body moving signal, and converts it to the voltage signal, the signal is amplified, comparison, time delay, control the relay connect or disconnect the mobile phone to the owners alarm. The components are welded on the circuit board, and connected to internal lead wire of mobile phone key, electrifying testing, it can realized anti-theft alarm and monitoring function.
Analysis on Vehicle On-Center Performance
Authors: Li Hai Bin , Ji Peng
Published: February 2012

On-center handling performance for high speed vehicle is becoming more and more concerned. Road feel is the most indexes to evaluate the on-center handling performance. Steering system is the key part of the whole vehicle to affect the performance, which include much nonlinearity: steer ratio, dry friction and stiffness etc. In this paper, steering system model is set up by ADAMS, and embed into the whole vehicle model to study the effects of these nonlinearities on on-center handling performance.
Stress Field Simulation of Concrete Structure Considering Influence of Temperature on Autogenous Volume Deformation
Authors: Zhang Xiao Yue , Liu Shao Ping
Published: February 2012

Aotugenous volume deformation is one of the influence factors of stress field of concrete structure. Generally, the influence of temperature on autogenous volume strain is not considered in calculation. In fact, the difference of internal and surface temperature of concrete structure can lead to different hydration reaction and different autogeneous volume deformation. In order to find out the effect of temperature difference on aotogenous volume deformation and stress field of concrete structure, a model is established and a corresponding example is given. The result shows that it is necessary to take temperature effect into consideration while calculate autogenous volume deformation in stress field simulation of concrete structure.
Characterization and Properties of Chitosan-Soybean Trypsin Inhibitor Blend Film with Antifungal Activity Inhibits Aspergillus flavus α-Amylase
Authors: Zhang Bin , Deng Shang Gui
Published: February 2012

The chitosan-based blend films were prepared from chitosan, soybean trypsin inhibitor (TI) extract and glycerol (Gly) solutions, the properties of which were investigated, including mechanical property, water vapor transmission, transmittance, solubility, and the microstructure. Then, the antifungal activity against A. ﬂavus by the blend films had been investigated. The resistance to A. flavus infection was partially due to the ability of TI to inhibit α-amylase activity, thereby limiting the availability of hydrolyzed reducing sugar for fungal growth. And the facts that the germination and growth of A. ﬂavus were strongly inhibited by chitosan-TI-Gly film indicated the blend films might be useful as potential biocontrol packaging against A. ﬂavus during the peanuts storage.
Coal Mining Industrial Robots the Institutions of the Modeling and Simulation
Authors: Lu Shu Kuan
Published: February 2012

With practical small coal roadway coal winning machine for reference to the tunneling of the prototype, the mining of coal industry robot is analyzed. The coal set up 3 d model of the robot, and analyzed the main part. Coal institutions became a hybrid driven simplified controllable seven poles structure model, the use of robots COSM OSM otion coal mining mechanism model of the simulation and analysis, and the results show that: through a mixture of drive controllable institutions can make the smaller of input enough amplifier, which can save energy, reflected the superiority of the composite driving controllable institutions. And on a movement cycle repeated impact there, this characteristic is suitable for the coal mining robots work characteristics, can reduce the reaction, which is beneficial to the whole of the equipment operation.
Theory and Experimental Research on Inclusions Aggregation in Molten Steel
Authors: Yue Qiang , Wang Cheng , Kong Hui
Published: February 2012

A mechanism of particles aggregation in liquid media is analyzed by applying the theory of aggregation which was developed in the field of colloid engineering. Hydrophobic particles are liable to aggregate in collision. Inclusions aggregation by using solid plastics particles in various solvent is observed in the course of floatation. Aggregation rate and size distribution of particles in turbulent dispersions has been studied. The aggregation contributed by plastic particles based on surface energy density and the droplet surface oscillation is considered. Hydrophobic particles, generally having a tendency to aggregate in water, disperse well in ethanol, particles in the mixture of water and ethanol are much better disperse than separately in water. The solvent properties, temperature and simulation particles are influence to the aggregation from the experiment that we can discover. The aggregation rate and size distribution were determined by wettabiliy.
The Research Advances in the Flexible Tubular Organs Material
Authors: Tan Heng , Wang Ze , Dai Guo Hong , Ye Xia
Published: February 2012

The domestic and foreign research situation of the biomechanical characteristics and rheological characteristics of the biological flexible tubular organs is introduced in this paper. The research includes the biomechanical characteristics of the cardiovascular system ,the trachea，the alimentary tract and the rheological characteristics of the blood, the mucus. The biomechanical characteristics of the biological flexible tubular organs divides into two parts: the stress-strain rule is researched through the one-dimensional or two-dimensional tensile experiments of the biological flexible tubular organs；the wall residual stress strain is researched for the biological flexible tubular organs in no load conditions. The stress-strain rule has been acquired through the one-dimensional or two-dimensional tensile experiments of the cardiovascular system, the trachea, the alimentary tract. The walls of the cardiovascular system ,the trachea，the alimentary tract have residual stress strain through measuring the opening angles.
Phase Change Materials of Microcapsules Containing Paraffin
Authors: Huang Dian Wu , Wang Hong Mei
Published: February 2012

In this study, phase change microcapsules were prepared by in situ polymerization using paraffin as core material, poly(MMA -co- MAA) as shell material, Tween60/span60 as emulsifier. The surface morphology, thermal properties and particle size distribution of the prepared microcapsules were investigated by using SEM, TGA, DSC and ELS. The effects of paraffin core content and amount of emulsifier on the properties of microcapsules were studied.
Numerical Simulation of 2D Hydraulic Jump Flow in a Vertical Plane
Authors: Wei Wen Li , Zhao X.J , Liu Y. L
Published: February 2012

This paper was concerned with a vertical two-dimensional (2D) flow model with free surface. The water governing equations were discretized with finite difference method. The function of volume method was employed to track the moving free surface. The model was used to predict the characteristics of hydraulic jump flow in a 2D vertical plane. The surface profile and time averaged velocity were calculated, which shows the proposed model can be capable of capturing sharp water and gas interface configuration as time changes.
Effect of Cooling Rate after Deformation on Microstructure of V-N Microalloying High Strength Aseismic Rebar
Authors: Zhao Dong Wei , Cao Jian Chun , Chen Wei , Deng Lei , Shi Zhe , Qi Xin
Published: February 2012

Thermo-simulated test was conducted to study the effect of cooling rate from 1 °C/s to 15 °C/s on microstructure of V-N microalloying high strength aseismic rebar. Microstructure investigation was done using both optical and scanning electron microscopes. Microstructures in center of the rebar mainly consist of ferrite, pearlite, and bainite. The percentage of bainite increases below 5 °C/s cooling rate and decreases between 5 °C/s and 15 °C/s with the increase in cooling rate. At the cooling rate of 15 °C/s the fraction of bainite is about 7.7%, and the finest ferrite with 5.3 μm was obtained. Higher strength value obtained at the cooling rate 8~10 °C/s is due to the combination of smaller ferrite and about 10 % bainite.
Mechanical Properties Study of FRP Tube Steel Reinforced Concrete Structure Subjected to Axial Compression
Authors: Zhou Le , Li Kai , Jiang Ji Hong
Published: February 2012

In order to facilitate the actual design of the project, we study force performance of FRP tube steel-reinforced concrete columns under axial load. By five FRP tube steel reinforced concrete structures of axial compression, explore the damage characteristics and the force characteristics of the combination of column, and study parameters on performance of the force combination of column such as FRP tube wall thickness, fiber winding angle and loading mode etc. The capacity of combination column increases with the larger of the FRP tube wall thickness; and increases with the smaller of the FRP fiber winding angle; loaded in different ways lead to different capacities. Using superposition method Study and deduce a more reasonable axial compressive bearing capacity formula of FRP tube steel reinforced concrete structure. Theoretical calculation results match well with experimental results.
Evaluation of Maximum Inclusion Size and Fatigue Limit for High Strength Steel in Rotating Rending
Authors: Wang Ping , Li Wei , Wang Dong Ming
Published: February 2012

Based on the observation of fracture surfaces for a low-alloy high strength steel under rotating bending in very high cycle regime, a newly defined method about inspection plane under rotating bending was developed in this paper. By using the statistics of extreme values (SEV) method, the maximum sizes of inclusion and FGA corresponding to the control volume of specimen are evaluated to be about 41.38 μm and 58.51 μm on the basis of this newly defined inspection plane, and the corresponding values of fatigue limit are evaluated to be 690 MPa and 654 MPa, respectively. It should be noted that fatigue design based on former involves a certain amount of risk in very high cycle regime.
Virtual Design and Interactive Demonstration of the Product Based on Sketchup
Authors: Wu Yi Wei , Zhong Yi , Wu Di
Published: February 2012

In order to design industrial products efficiently, the Google's free software--SketchUp was used for the design and research of the product which can transform from a single chair to double person bench, and the SketchyPhysics plug-in was used to complete the dynamic showing process of the design product. The design cycle is short and it is easy to adjust and operate. SketchUp and its plug-ins can be competence for the design of industrial product and presentation.
The Optimum Arrangement of Working Face Ventilation System for Coal Mine
Authors: He Ning , Ma Qiu Ju , Shi Yu Zhu
Published: February 2012

It was most effective and practical that using computational fluid dynamics simulation to analyze the distribution of flow field in gob for studying optimal layout scheme of the working face ventilation system. In this paper, numerical simulation was applied for studying the migration laws and high concentration of gas gathering area of N1201 working face in Tunliu Coal Mine; the gob of robbing working surface gas migration laws and high concentration of gas gathering area was obtained; the optimum arrangement of ventilation system for the working face was given. The conclusions had a certain theoretical value and practical significance for controlling the working face gas.
Study on the Influence of Compression Damage on Tensile Properties in Fully Lamellar TiAl-Based Alloy
Authors: Tang Bin , Chen Chuan Jing , Xue Zhi Yong , Wu Chun Jing , Li Shuang Shou
Published: February 2012

The changes of the tensile properties of the full lamellar TiAl alloy under pre-compression were studied by means of pre-compression damage tests and tensile tests. The study indicated that：The changes of the tensile property of the damaged alloy at room temperature were different from that of high temperature. The mechanical property of the TiAl alloy degrades because of the present of the cracks, which decrease the load area of the alloy.
Analysis and Study of the Steel Plate Surface Defects Image Processing and the Fractal Dimension Characteristics
Authors: Wang Xuan , Liu Wei , Cao Hui , Ma Dong Ping
Published: February 2012

Steel surface defect detection is the key point of this research. The paper mainly focuses on the image processing and image feature extraction of the steel plate surface. The paper also focuses on the calculating procedure and results of the fractal dimension in different defects images. It can be concluded from the results of the study, fractal dimension of the defect images becomes an important feature of the steel plate surface image pattern recognition.
Fault Control for a Class of Nonlinear System with Input Delay
Authors: Yu Yang , Wang Wei
Published: February 2012

The paper studies fuzzy fault control for a class of nonlinear system with input delay based on T-S fuzzy model. The state feedback controller that ensures the stability of fuzzy tolerant control system is given via Lyapunov theory and derived in terms of LMI and the results are delay-dependent. Simulation examples are given to illustrate the effectiveness of the approach.
Research on Fluid-Structure Interaction Dynamic Characteristics of Steam Generator Heat Exchanger Tubes
Authors: Zhang Li Na , Zhao Hui , Liu Min Shan
Published: February 2012

For heat exchanger tube of steam generator, the relation between heat exchanger tube and fluid is typical fluid-structure interaction problem. Flow induced vibration has been found so far to be responsible for fatigue damage and failure of steam generator tubes, which will result in large economic loss and radioactive pollution. So the steam generator tubes are the weakest link in the primary coolant loop. Based on the synthesis of all sorts of factors influencing the dynamic characteristics of steam generator heat transfer tubes, establishing the heat transfer tube model, research on the weakening effect of fluid hole on fluid, the natural frequencies of the heat transfer tubes are analyzed under different fluid holes and fluid hole distance by numerical simulation.
Polypseudorotaxane Hydrogels Based on F127 Block-Selected Inclusion Complexation with α-Cyclodextrin
Authors: Zhou Ying Xue , Fan Xiao Dong , Xue Dan
Published: February 2012

Supramolecular hydrogels were formed through F127, acryloyl chloride modified F127 inclusion complex with α-cyclodextrin, respectively. The structure of modified copolymers and inclusion complex was characterized by Fourier transform infrared spectroscopy (FTIR) and hydrogen nuclear magnetic resonance (1H-NMR). Hydrogels formed from supramolecular inclusion are imparted channel-type structure investigated by wide angle x-ray diffraction (WAXRD). Differential scanning calorimetry (DSC) and TG experiments showed that thermal stability of hydrogels depend on the nature of axis polymer. The relative model was proposed to elucidate the inclusion complexes and hydrogels formation.
Mechanical Engineering in English Teaching
Authors: Yu Ying
Published: February 2012

Based on the characteristic of English for mechanical engineering (EME) curriculum, an analysis is made of the EME teaching situation and learners’ requirement, and then the EME teaching practice is researched from the respects of teaching materials selection, acquisition of vocabulary, analysis of long complex sentence, training of students autonomous learning and diversity of teaching methods in order to well cultivate compound talents needed in the new century.
Biomimetic Universal Blade Test Analysis
Authors: Li Zhuo Shi , Wang Zeng Hui
Published: February 2012

The experiment on four factors (bending angle, bending radius, tangent edge sliding cutting angle, operating width) that affect the single-pole unit width twist of rotary-broken universal blade is done using orthogonal experimental method.The paper respectively set up the function operations of single-pole unit width twist and bending angle, bending radius, tangent sliding cutting angle, and single-pole blade width according to experimental results. By these function operations, the paper analyze the value and scope of various factors in order to minimize the single-pole unit width twist under the conditions of rotary experiment.
Study on Warship Combat System Design Using DMOPSO Algorithm
Authors: Ren Wei , Xiong Ying , Xia Hong Mei
Published: February 2012

A new method for selecting warship combat system during the period of warship alternatives conceptual design was discussed in the paper. After computing the overall measure of performance (OMOE) and overall measure of risk (OMOR) of all combat sub-system using analytic hierarchy process and utility function, the design variables representing this equipment alternatives were selected using discrete particle swarm. Niche technique was used for constructing non-dominated sort set and TOPSIS method was adopted to sort the final pareto solution. The results of selecting equipment alternatives in warship combat system show that DMOPSO (discrete multi-objective particle swarm optimization) can search the overall pareto solution effectively.
Consensus Analysis of Nonlinear Dynamical Multi-Agent Systems by Relative Lyapunov Function Method
Authors: Ma Hai Ying , Cai Ning
Published: February 2012

In this note, condition for consensus of general nonlinear high-order multi-agent systems is analyzed based on the idea of space transformation. Consensus can be assured by sufficient connection of network and the dissipative property of the entire system regulated by relative Lyapunov function, with two independent variables.
Flexible Photovoltaic Solar Cells Based on AZO Anode
Authors: Sun Nan Hai , Bai Xu Can , Li Ming Wei , Yao Bo Lei
Published: February 2012

This paper presented an efficient flexible bulk-heterojunction [regioregular of poly(3-hexylthiophene) (P3HT):(6,6)-phenyl C61 butyric acid methyl ester (PCBM)] solar cells with a highly transparent and electrical conductive NiO film as hole-transporting layer (HTL) on optimized Al doped zinc oxide (AZO) substrate. The strcture of this kind of devices is PET/AZO/NiO/P3HT: PCBM /Al. The highest power conversion efficiency (PCE) on glass substrate is 3.15%, and 1.66% on flexible substrate. The physical and electrical properties of AZO thin film were discussed, and the device photovoltaic characteristics were investigated in detail.
Integration of CAx/PDM Systems Based on Service-Oriented Architecture
Authors: Liu Yan Bin , Tong Xiao Wei
Published: February 2012

The emphasis of enterprises information is manufacturing information, the key of which is to realize the information sharing and integrating. In this paper, a new approach to integrate CAx / PDM systems is provided, which is based on service-oriented architecture. In accordance with service architecture, the PDM's functionality can be encapsulated by a new interface which is developed based on it's original interface. In this way, the PDM can be invoked as a service for CAx systems, such as CAD,CAPP,CAE etc, the CAx systems can share information with each other and realize the integration of heterogeneous system.
Supply Chain Coordination with Option Contracts in VMI System
Authors: Wu Jian Zu , Liu Jin
Published: February 2012

This paper focuses on the optimal option contract coordinating of ordering quantity and option prices between retailer and supplier in a VMI system under market uncertainty. The option contract is characterized by a dominant supplier with two parameters which are ordering price coand executive price cepaid by retailer. An option ordering price is paid by retailer for each additional ordering unit of product at the end of selling reason if realized demand is larger than retailer’s committed minimum ordering. An executive price plays a role of purchasing price for each unit of product if retailer set a second ordering. A successful coordination has been shown and a numerical analysis demonstrates that such an option contract brings a Pareto improvement to each party, especially to the retailer. At last, the analysis of market uncertainty effects on the profits of both sides illustrates that, as the increasing of market demand uncertainty, the retailer’s ordering quantity of options will increase but his profit will reduce, and supplier’s profit will add.
Effects of Inoculation on Microstructures and Mechanical Properties of Resistance Spot Welded Magnesium Alloy Joints
Authors: Sun Hai Xuan , Sun Da Qian , Wang Xin Zui , Yin Huan Cai , Cheng Wen Bo
Published: February 2012

Resistance spot welded magnesium alloy joints contain the nugget and heat affected zone (HAZ), and the weld nugget of magnesium alloy generally contains two different microstructures, the cellular dendritic crystals at the edge of the nugget and the equiaxed dendritic crystals in the center of the nugget. Characteristics of cellular dendritic crystals make the cellular dendritic crystals zone to be the weak area, and the more unfortunate thing is that it is located in the high-stress zone, which further degrades the mechanical properties of the joints. Based on this conditions, inoculation would be tried to refine the cellular dendritic crystals in order to improve the mechanical properties of resistance spot welded magnesium alloy joints. Al-10Sr was chosen as the inoculant in this experiment. As the addition of Al-10Sr increases from zero to 1.4mg, the average width of cellular dendritic crystal zone decreases from 332μm to 58μm while the microstructure tends to be refined, accordingly, tensile shear load of the joints increases by 24.3% from 2.379 KN to 2.959 KN. It is favorable to select a relative higher content of Al-10Sr addition to improve the mechanical properties of the spot welded magnesium alloy joints.
Line Selection Analysis of Ground Fault in Distribution Network Based on Chief Half-Wave and Remnant Current
Authors: Peng Fang , Zhou Yu Shen , Liu Yong Feng , Yuan An Hui , Zhu Lei
Published: February 2012

Abstract：This paper analyses characteristics of single-phase ground fault in distribution system. Now, most of the line selection methods have some limitations, which leads to the low accuracy of the fault line selection. In order to solve above problems, make use of the matlab software in this article to simulate and analyze the isolated neutral system and resonance neutral earthing system when they occur single-phase ground fault. Finally, the new method based on first half wave method and increment of residual current to improve the accuracy of fault line selection is proposed.
Prediction of Molten Pool Width with Artificial Neural Network Model
Authors: Wang Teng , Gao Xiang Dong
Published: February 2012

Online monitoring of welding process has become necessary as the use of laser welding increases. In laser welding the molten pool width is one of the most important quality aspects. Metal plume and spatters are measured and used as signals for predicting the molten pool width. In this work, BP neural network model is established. The effectiveness of the model is demonstrated, the results show good agreements with corresponding experimental data.
Virtual Manufacturing for Machining Process Monitoring
Authors: Li Bai Chun , Fu Hai Jun , Yu Tian Biao , Wang Wan Shan
Published: February 2012

This paper presents an overall framework of the machining process monitoring system based on virtual manufacturing and does research on its key technology and validates the system with a engraving machine tool. By using of tabletop virtual reality platform Quest 3D, a virtual environment of the machine tool has been created and the machining simulation combined with VC++ has been realized. It has been proved that the simulation and the actual processing interface of monitoring interface are consistent, and the effect is very good. What's more, Using the network module of the virtual reality platform Quest 3D and the additional functions of the database operation, the communications among the machine tools, the server and the client is finished and the manufacturing process monitoring system based on virtual manufacturing is also realized.
Study on the ERP System Selection Based DEA Model
Authors: Qu Jian Hua , Gao Xian Kun
Published: February 2012

This paper put forward the principal and index of ERP. After the analysis of present ERP selection method and the character of ERP selection, the cone-ratio C2WH model, which preference cone is constructed with AHP method, is valid in ERP selection. Numerical example shows the effectiveness of such model used in ERP selection.
Fabrication of 50nm T-Gate on GaN Substrate
Authors: Liu Fan , Gu Guo Dong , Zeng Chun Hong , Li Hai Jun , Wang Wei , Zhang Bao Shun , Yuan Jin She
Published: February 2012

This paper reports New advances in e-beam lithography which have made possible the fabrication of high electron mobility transistors (HEMT) on GaN substrate with gate length well in the nanometer regime. Using PMMA/PMMA-MMA Pseudo-bilayer resists technology with electron beam lithography preparation 50nm gate length T-gate. A method of in a single lithographic step and a development step, which can be applied to simplify the process and get a more narrow gate. The ratio of head to footprint of the T gate is controllable. The way meets the need of the device fabrication.
Modal Analysis and Experimental Analysis of Dynamic Characteristics of Linear Rolling Guide
Authors: Li Xiao Peng , Guo Hao , Liu Jing Nian , Liu Ya Li
Published: February 2012

The finite element model of the liner rolling guide of the CNC machine tool is established. Then the natural frequencies and the corresponding vibration modes of the liner rolling guide (LRG) are obtained by analyzing the finite element model (FEM) of the linear rolling guide in two different boundary conditions. By comparing the modal characters of the two states it is proved that the movable joint and bolted interfaces of the rail have certain effects on the dynamic performance of linear rolling guide. Besides, the liner rolling guide also have been tested dynamically, obtaining the modal parameters of the rail guide; finally, the validity of finite element model and the effect of boundary conditions on the interface of the linear rolling guide are verified by comparing the finite element analysis of frequency and experimental analysis of frequency
Microstructure and Performance of Nano-Al2O3/Ni-Co Composite Coatings by Electro-Brush Plating
Authors: Wang Xiao He , Xu Bin Shi , Hu Zhen Feng , Dong Shi Yun
Published: February 2012

To remanufacture hard chromium-plated workpiece, nano-Al2O3/Ni-Co composite coatings and Ni-Co alloy coatings are developed using electric brush plating technology. Scanning electron microscopy (SEM) and transmission electron microscope (TEM) are used to analyze the surface morphology, phase structure and wear properties of coatings. The surface morphology of nano-composite coating is more compact. The nano-particles are well-distributed in the coating and bounded tightly with the substrate. The hardness of composite coating is HV1027, increased approximately 38% compared with Ni-Co alloy coating, overtaking the hard chrome plating. The results of sliding wear test shows that the nano-composite coating reduces friction coefficient, increases wear resistance significantly and exceeds the chromium plating.
Review of Nanobainite Steel Welding
Authors: Fang Kun , Yang Jian Guo , Zhao De Long , Song Kui Jing , Yan Zhong Jie , Fang Hong Yuan
Published: February 2012

Nanobainite steel is a new strong structural material with an ultimate tensile strength of 2500 MPa, and toughness in excess of 30-40 MPam1/2. However, so far, no suitable methods can realize its welding because of poor weldabilities. This paper reviews recent researches on welding of nanobainite steel and points out their merits and demerits. Three problems during welding, cold cracks, formation of brittle martensite, and cementite precipitation, are presented. Several possible methods are provided and discussed. This paper is intended to provide an introduction of the development of welding of nanobainite steel, give several suggestions theoretically for future research, and inspire further applications for nanobainite steel.
The New Preforging Method of Closed-Die Forging with Controlled-Flash for Steering Knuckles
Authors: Cheng Lian Jun , Zhang Tie Zhu , Zhang Hong Xin
Published: February 2012

In this paper, the new forging process for forming the steering knuckle of the truck is proposed, which includes preforming, preforging and finish-forging. The key technology of new forging process is focused on the preforging design. The closed-die forging with controlled-flash process for the preforging is proposed, by which the material utilization rate is enhanced greatly. The proper preforming includes three steps: rod extrusion, fork flatting and cleaving. The 3D finite element method (FEM) for simulation the forging process is also presented. The new and the traditional forging processes of producing the steering knuckle are compared too.
Characterization of Spherical Molybdenum Powders Prepared by RF Plasma Processing
Authors: Sheng Yan Wei , Guo Zhi Meng , Hao Jun Jie
Published: February 2012

Spherical molybdenum powders were synthesized by (RF) plasma with irregular molybdenum powders. The powder characteristics and spheroidization efficiency of the feeding rate for obtain the spherical molybdenum powders were studied. The phase composition and morphological properties of the powders were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM). As a result, the fine spherical powders composed of pure molybdenum with favorable dispersity and its surface became smooth. The spheroidization efficiency of synthesized powders was almost 100 % at feeding rate of 5g/min. LMS analysis indicated that the as-prepared powder had narrow particle size distribution and the spheroidization efficiency of the sample decreases gradually as increasing of the feeding rate. The RF plasma spheroidization of molybdenum powder is an ideal route synthesis of well- spherical molybdenum powders used as near net-shape technology and powder metallurgy.
Density-Functional Theory Study of Ce@C82
Authors: Zhang Guo Lin , Zhang Jian Min , Yuan Hong Kuan
Published: February 2012

The magnetic ground state structure of the metallofullerene Ce@C82 is confirmed by the density functional calculations. The results show that the Ce atom is located inside the C82 cage with site at the C2 symmetry axis. The effective magnetic moment of Ce@C82 is increased relative to the value of a free Ce3+ ion. The reason is that there is hybridization between unoccupied Ce-4f states and carbon-π states, which result in a general ferromagnetic coupling of the Ce-4f spin with the remaining unpaired spin in the hybridized molecular orbital.
CFD Simulation on Circulation within the Liquid Slug under Gas-Liquid Taylor Flow in Circular Capillary
Authors: Xie Yun Feng , Zhang Xu Bin , Wang Yan , Cai Wang Feng
Published: February 2012

Computational Fluid Dynamics (CFD) was used to simulate the circulation within the liquid slug on gas-liquid Taylor flow in circular capillaries. The velocity profile within liquid slug was studied, the strength of circulation was considered. The separate influences of the gas bubble velocity， Taylor unit length, capillary diameter and liquid film thickness on the internal circulation in liquid slug were investigated. Parabolic velocity distribution inside liquid was obtained and found to in good agreement with the literature report. The strength of circulation was mainly determined by the gas bubble velocity and the liquid film thickness.
Study on Management of Invite Public Bidding of Military Equipment Material Stock
Authors: Dong Peng , Luo Zhao Hui , Zhang Wei Hong
Published: February 2012

In allusion to the problem of the management of invite public bidding of military equipment material stock, we analyses the specialty of invite public bidding of military equipment material stock, researches the model of negotiate mechanism based on bargain; in allusion to course of judging signs, the peculiarity of fix quantify indexes and determine the nature indexes in its judged indexes, put forward a method of synthesis multiattribute group decision- making of operator of OWA and lingual OWA to study it, has come true the judging and ordering signs in management of bidding and tendering. Finally, study an application example to prove that the method is effective.
Experimental Evaluation of X-Ray CT Images of Asphalt Mixture Based on Threshold Segmentation Principle
Authors: Wei Jian Jun , Li Hai Bin , Wan Cheng
Published: February 2012

In order to select threshold of CT image of asphalt mixture for image segmentation more accurately, the perlite powder was added in asphalt mixture to increase the density contrast, three different mixture gradations in which added different levels of perlite powder were prepared and compacted in laboratory, the X-ray CT was used to scan the asphalt mixture specimen to obtain continuous CT images, the CT images were transformed to be histograms which formed double peak. Through comparing with the double peak situation of three mixture types, AC-13 has the best double peak situation, AK-13 and SMA-13 have similar feature of histogram. The results indicate that the addition levels of perlite powder influence the double peak situation significantly. This new approach is an effective way to identify aggregates, mastic and air voids exactly.
Analysis on Engine Stall Issue of Closed Hydraulic System
Authors: Cao Zhong Yi , Liu Rui Guo , Wu Wan Rong , Chen Qing
Published: February 2012

The paper obtains motor pressure, flow and speed and the engine speed curves with time by theoretically analyzing closed hydraulic system of wheel walk engineering machinery and establishes a mathematical model of the system and AMESim simulation model. The simulation curves show that in some cases the external loads react against motor and drive motor speeding and then motor outlet flow increase that leads to the pressure of low-pressure side increasing and the pressure of high-pressure side reducing. The mutation of system pressure drives bump and engine speeding that equates to the engine speed is lower than the speed corresponding to the motor flow, which is engine stall problem. The simulation results show that the basic reason of engine stall is walking condition mutation leads to motor speeding and system pressure mutation and then motor reacts against bump and engine.
A Kind of Preconditioned IGMRES(m) Algorithm
Authors: Yu Chun Xiao
Published: February 2012

Fundamental theories are studied for an Incomplete Generalized Minimal Residual Method(IGMRES(m)) in Krylov subspace. An algebraic equations generated from the IGMRES(m) algorithm is presented. The relationships are deeply researched for the algorithm convergence and the coefficient matrix of the equations. A kind of preconditioned method is proposed to improve the convergence of the IGMRES(m) algorithm. It is proved that the best convergence can be obtained through appropriate matrix decomposition.
The Development of the Free Shuttle Bus Policy in Hsichu, Taiwan
Authors: Hsu Ming Tsai , Chiu Chin Hsin , Chen Hsuan Yi , Ho Li Hsing
Published: February 2012

Abstract. When the citizens of Hsichu became concerned about their polluted atmosphere their thoughts centered on their mode of transportation. An investigation by the city government resulted in a study which showed that if more people rode buses for working, shopping, etc. this result would be fewer cars and scooters on the streets. In order for this to come about, the bus service needed to be improved. The SWOT model was implemented. SWOT stands for Strengths, Weaknesses, Opportunities and Threats. The satisfaction of the residents is now evident.
The Design of Portable Electromyograph and Induced Instrument
Authors: Qin Gang , Li Han , Feng Xiao Gang
Published: February 2012

Aiming at the complex operation , low performance-to-price ratio and the weak adaptability of the like products at present, this paper designs one type of portable electromyograph and induced instrument, The detector uses S3C2440, low power consumption but high performance ,as its main processor. it designs sEMG signal detection module by itself, and proceed electromyography collection, display and storage in time. The practical use shows that the instrument is chiefly featured by complete functions, low power consumption, simple portable, low price, and extensive application etc.
Graphic Simulation of Hobbing Process for Higher-Order Elliptic Gear
Authors: Liu You Yu , Zhang Gou Zheng , Han Jiang
Published: February 2012

To solve higher-order elliptic gear manufacturing problems, this paper builds the model of hobbing process based on higher-order elliptic gear equation, and researches the graphic simulation technology of hobbing process by using tools (inclined) rack. Four higher-order elliptic spur gears and helical gears with different parameters are simulated by Matlab, to verify the processing model built and the condition of hobbing process can be applied. This work provided the theory foundation for the manufacturing modular of higher-order elliptic gear in CNC System and the reference for its manufacture.
New Methord of Optimizing the Filling Time in Injection Molding
Authors: Zhang Shi Qiang , Liu Hai Sheng , Wang Hui Gang , Liu Xiao Wen
Published: February 2012

In order to acquire the best filling time, Mold trial is made by setting different injection time, or Moldflow software is used to analysis data recorded by computer. Whether doing successive trials or being simulated point by point, is very tedious. Put forward a method of using the Lagrange to simulate a curve based on the mold flow analysis, the minimum of the curve is the best filling time. This method can gain the best filling time as quickly as possible, and improve the efficiency of the mold flow analysis.
Analysis for the Propagation of Edge Crack of Silicon Steel during Cold Rolling Process Based on GTN Damage Model
Authors: Yan Yu Xi , Sun Quan , Chen Jian Jun , Pan Hong Liang
Published: February 2012

Silicon steels tend to develop edge cracks during cold rolling, which need to be removed and cause rupture of the steel in the rolling mill. Hence, it is necessary to understand the formation of edge cracks. The damage distribution and the initiation and propagation of edge cracks occur around the notch tip during cold rolling process was investigated by using GTN damage model. The damage parameters f0, fcand fFare determined by tension experiments and SEM observation. The influence of various rolling parameters on damage distribution and crack length was simulated by using ABAQUS. The numerical results show that the GTN damage model is available to prediction the initiation and propagation of edge cracks during rolling process. Parametric study carried out in this present work reveals that the possible occurrence of edge cracks is higher at larger reduction, higher friction coefficient, smaller roll radius and stronger unit tension. The simulation and experimental results have a good agreement .
Research on the Calibration Technology of Robot Vision System
Authors: Wang Jian Qiang , Chen Li Song , Zhu Jiu You , Niu Zhao Long , Tang Dong Hua
Published: February 2012

This paper introduces calibration technique for robot vision system, aiming to enhance the robot’s ability to adapt to various environments. In accordance with a calibration plate and car body, we figured out the relationship among the coordinates of car body, camera, and robot by image acquisition, processing, analysis, and calculation. An algorithm was developed to deduce the coordinate transformation between robot frame and calibration plate frame with 4 points. Its feasibility was validated by the experiment.
Discussions about Scaling Rules of Suction Anchor Model Tests
Authors: Xu Hui Min
Published: February 2012

Based on the equation analysis method and theorem dimensional analysis, the scaling rules between field tests and mode tests for embedded suction anchors have been investigated. Some critical parameters affecting the characteristics of anchor penetration and capacity are studied in detail. It is illustrated that although adopting non-normal scale because of using prototype of soil and water in model tests, the model tests could reflect the qualitative nature in field tests through adjusting some critical scale factors.
Construction Monitoring and Post Analysis of a Deep Foundation Pit
Authors: Zhang Rui Mei , Cao Jing , Song Zhi Gang
Published: February 2012

Construction monitoring of excavation engineering is important in verifying design theory and guiding field construction. It plays a significant role in safety management of construction, deformation control of supporting structure and safety assurance of surrounding buildings. A construction monitoring of a deep foundation pit in urban village is carried out. The observation datum are reviewed and analyzed. It is found that the process of high pressure water-rushed hole by single tube and poor piling result in silt are two main reasons for large deformation observed in supporting structure and surrounding ground.
Adaptive Detection of Sinusoidal Signal Based on Adaptive Iir Notch Filter
Authors: Liu Jin Chun , He Qi Wei , Zhu Shi Jian
Published: February 2012

Adaptive tracking sinusoidal signals with time-varying frequency buried in white noise presents a great interest in engineering applications. A simple approach of application of adaptive notch filters (ANFs) in recursive identification was presented. The use of adaptive infinite impulse response (IIR) notch filters is exploited to detect the sinusoidal components in noise as far as the two-stage vibration isolation system. Computer simulations and experiments on real signals generated by the two-stage system vibration isolation demonstrate the advantage of this method in terms of estimation variance, convergence speed, and the capability of tracking the signals.