bluuebunny/crossref_metadata_2025 huggingface dataset:
Three-Dimensional Micro-Channel Structure of Graphene Field-Effect Transistor
Authors: Liu Hong Zhong , Liu Wei Hua , Liu Jun Hua , Li Xin
Published: July 2011

Graphene, comprising of monolayer of carbon atoms packed into a two-dimensional honeycomb lattice, has a series of peculiar properties such as the anomalously quantized Hall effects, the large charge carrier mobility and so on. Both micromechanical cleavage method and hydrazine reduction process are used to produce graphene sheet. Two kinds of graphene pattern have been placed between the source and the drain electrodes of a new type of combined three dimensional back-gated FET as the channel by location transplantation method. Micromechanical cleavage method can produce graphene which has uniform crystal lattice structure and the same chirality, while chemical reductions produce graphene with different chirality. The IDS-VDS curves of FET properties show that micromechanical cleavage graphene sheet channels have obvious response to the gate voltage.
Channel Direction Effect on the GaAs Mesfet Performances for MEMS Accelerometer Application
Authors: Shi Wei Li , Xue Chen Yang , Tan Zhen Xin , Liu Jun , Zhang Wen Dong
Published: July 2011

An experimental investigation has been carried out with clarifying the external mechanical stress effect on GaAs metal-semiconductor field-effect transistor (MESFET) I-V characteristic curve which as the sensitive element of micro-accelerometer in different condition. In this paper, we research different channel directions to explore the output characteristics of the GaAs MESFET which fabricated at the root of the cantilever. We design three channel directions which angled with the cantilever as 0 degree, 45 degree, 90 degree. We find that when the Channel direction parallel to the cantilever direction, ∆U has the maximum value of 12.13mv. The sensitivity of 0 degree is 0.04mv/g higher than the 90 degree. The dynamic result indicates that the channel direction parallel to the cantilever direction is the optimized design structure.
Dynamic Analysis of Physical Modeling of Underground Gas Storage
Authors: Shi Lei , Gao Shu Sheng , Hu Zhi Ming
Published: July 2011

Reservoir characteristic of Underground gas storage（UGS）was not only unique, but also complex, which decided the steady and reliability of operation for UGS in the long run, brought the initial building difficulties, and affected the long effective period of economy and important parameters. So learning building and operation mechanism of UGS could help us in the process of actual production. According to the characteristic of UGS, Indoor physical modeling system was developed. The building process and several injection-production cycles of UGS were simulated. Basing on the operation rule of injection-production cycles of UGS and the flow mechanism of gas and water in reservoir, dynamic analysis theory of UGS was built. It was concluded that, porosity and permeability of reservoir, flooded condition, and heterogeneity degree of reservoir determined the building and operation effect of UGS together. Above all, flooded condition and heterogeneity were the main reasons of the long building period, the poor effect of operation and the unrealized program targets. So physical homogeneous reservoir should be used as the main target layer of UGS, and the flooded condition in gas reservoir need to be paid close attention in the long run of UGS .
Modeling and Simulation on the New Technology Diffusion of Cars Using Cellular Automata
Authors: Ma Fang , Chao Gang Ling
Published: July 2011

Based on cellular automata (CA), the new technology diffusions of domestic cars and completely knocked down (CKD) cars were modeled and simulated. It is found that: (1) CA method successfully examined the new technology diffusion of domestic and CKD cars, (2) the predicted results of domestic cars show four stages of the life cycle of new technology, but those of CKD cars display only the decline stage of the life cycle, (3) the present technology of domestic cars in China is in the period of growth stage and that of CKD cars is at the decline stage, (4) with the advanced technology and new service are created and introduced into the industry of domestic cars, CKD cars will lose their market and be gradually out of the market.
Production Logistics System Simulation about Automobile Parts Shop Based on Witness and E-Factory
Authors: Zhou Rong , Zhao Han , Chen Ke
Published: July 2011

Aimed at the problems existed in the production logistics system for the automobile parts’ shop which has the characteristics of multi-product and small quantities, in this paper a production logistics simulation model is first established based on the witness to analyze the bottleneck of the current production line and to reengineer a new production process. Then a visual simulation model is established based on the e-factory to optimize the layout planning and the dynamic material handling system of the production logistics system which has been improved above. The results of this investigation present guidance and reference for other small and medium enterprises.
Flask Management in the Foundry Moulding Plan
Authors: Ji Xiao Yuan , Zhou Jian Xin , Liao Dun Ming
Published: July 2011

There are many studies about foundry process design, foundry quality control, and foundry methods selection; however few researches have been published regarding foundry production scheduling management and expert system and flask management in casting production in particular. It is difficult for a production planner to judge whether there are enough flasks to meet the moulding plan in casting companies, and it is a highly troublesome problem to provide the planned castings with the compatible flasks as well. In order to address these two issues, in this paper we analyzes the cause of the problem and finds that the difficulty is to manage assembling flasks, and then constructs a decision analysis method. The method can make a validity analysis to the made moulding plan, and make up a flask assignment solution for the valid plan. Finally, a foundry moulding plan expert system based on the method is developed to prove this study.
Agent-Based Modeling and Simulation on Multi-Stage Supply Chain Operation
Authors: Zhao Can Can , Zhang Xiao Dong , Lei Shao Juan , Qiu Jun Jiang
Published: July 2011

Supply chain simulation is a fundamental approach for supply chain prediction, management, evaluation, and improvement. In order to simulate member behavior, organizational strategy, and management strategy of the supply chain, an agent-based modeling and simulation approach on multi-stage supply chain operation was proposed in this paper. First, the model structure of multi-stage supply chain operation was introduced. Then, the individual agent behavior model was emphatically studied, and hierarchical colored Petri-nets were used to describe the agent behavior process and cooperative behavior process. Finally, the model was validated using a series of simulation which focused on the agent inventory strategy.
Finite Element Analysis of the Effect of Surface Hardening Depth in Port Crane Wheel
Authors: Wu Jiang Wei , Wang Peng
Published: July 2011

In port crane industry, the surface hardening technique is widely used in order to improve the strength of wheel. But the hardening depth is chosen only by according to the experience, and the effect of different hardened depths is not studied theoretically. In this paper, the contact stresses in wheel with different hardening depth have been analyzed by applying three-dimensional finite element model. Based on this model, the ANSYS10.0 finite element software is used. The elastic wheel is used to verify the numerical results with the Hertz’s theory. Three different hardening depths, namely 10mm, 25mm and whole hardened wheel, under three different vertical loads were applied. The effect of hardening depth of a surface hardened wheel is discussed by comparing the contact stresses and contact areas from the numerical results.
Integrated Process Planning and Scheduling Based on Genetic Algorithms
Authors: Wang Jin Feng , Li Shi Jie , Fan Shun Cheng
Published: July 2011

Process planning and scheduling are two important manufacturing activities in the manufacturing system. In this paper, an improved genetic algorithm(GA) has been developed to facilitate the integration and optimization of process planning and scheduling. To improve the optimization performance, an efficient genetic representation has been developed. Selection, crossover, and mutation operators have been described. Simulation studies have been established to evaluate the performance of the algorithm. The results show that the algorithm is a promising and effective method for the integration of process planning and scheduling(IPPS).
Odor Source Localization Using Multiple Robots in Complicated City-Like Environments
Authors: Liu Zhen Zhang , Wang Yi Jun , Lu Tien Fu
Published: July 2011

The detection of a dangerous emission source location has the potential to be enhanced by using plume-tracing mobile robots, without endangering human life during the detection and source localization process. So far, many researchers focus on odor source localization in simple & laboratory based environments. The present study focuses on more real life odor source localization scenarios. In this study, multiple robots were used and coordinated by a supervisory program to locate an odor source in complicated city-like environments. A series of simulations has been conducted and the results demonstrated the potential of the supervisory program to effectively control a number of robots to locate a dangerous odor source in real life scenarios.
Research on Shaft-Less Technology of Inking System
Authors: Zhao Ji Bin , Li Xiu Li
Published: July 2011

The principle of inking system in sheet-feed printing press is introduced. Some tests on ink thickness are performed and the experiment results shows that in the traditional press, some inherent defects cause serious quality problems. The application of shaft-less drive technology to printing press is introduced and the drive principle of inking rollers of printing press and is explained. Synchronization control method of rollers is put forward, and the shaft-less technology is applied to the inking roller. Control system of shaft-less roller press is constructed for four color printing. Mechanical zero and electrical zero can be reset and corrected. Slight asynchrony is allowed between inking rollers and cylinders for normal printing, and the speed difference between them can eliminate a kind of printing troublesome of ghosting when needed. Analysis shows that with this technology, the functions of press are extended. Furthermore, the results of calculation indicated that when printing the special products, the make-ready time for inking is shorten about 50% and the power consumption is decreased about 19.8 to 21.5%, so the efficiency of machine can be increased by a big margin and the power cost can be cut down obviously.
Experimental Research on Modifier Optimization of Flotation Process in a Molybdenum Ore in Inner Mongolia
Authors: Li Lin , Lu Xian Jun , Qiu Jun
Published: July 2011

The research has conducted a experimental research on the issues in modifier of flotation process in a molybdenum ore concentrating mill in Inner Mongolia. The results show that: when the raw ore is grinded into 61% -200 meshes, which is the same to the site production ore, the sorting index is optimum in neutral magma condition; and for dispersing agent, the sorting effect of sodium silicate is better than sodium hexametaphosphate, and the confirmed sufficient quality of sodium silicate is 300g/t.
The Research of Impact in Pipe Pile Squeezing Soil to Bearing Capacity of the Pile
Authors: Xu Jin , He Jing
Published: July 2011

This paper are doing responsive and exploratory test of the pile bearing capacity for squeezing soil. In order to provide the basis for determining the ultimate bearing capacity of the pile foundation for the design and construction units.
Distance Density Based Clustering Algorithm in Wireless Sensor Network
Authors: Lin Lin , Yan Shu , Nian Yi
Published: July 2011

The hierarchical topology of wireless sensor networks can effectively reduce the consumption in communication. Clustering algorithm is the foundation to realize herarchical structure, so it has been extensive researched. On the basis of Leach algorithm, a distance density based clustering algorithm (DDBC) is proposed, considering synthetically the distribution density of around nodes and the remaining energy factors of the node to dynamically banlance energy usage of nodes when selecting cluster heads. We analyzed the performance of DDBC through compared with the existing other clustering algorithms in simulation experiment. Results show that the proposed method can generare stable quantity cluster heads and banlance the energy load effectively.
Finite Element Analysis of Hydro-Viscous Drive Main Transmission Shaft Using ANSYS
Authors: So Re Feng , Yang Qian Ming , Wang Xiao Ming
Published: July 2011

The main drive shaft is one of the key component of the Hydro-Viscous Drive device. The advantage or not of the mechanics performance as the shaft running became the focus of technology design since the complexity of structural design caused by complex function and the strain displacement caused by alternating stress in the condition of low-speed and heavy-duty. The mechanics analysis has been accomplished by the traditional way of mechanics and been proved by the ANSYS , as well as the orderliness of the stress and stain been obtained on the condition of bearing conditions in this paper. The result of the finite element analysis has offered the design reference for the shaft optimizing and pointed out that there was the biggest stress and strain value near the oil hole φ22 in the direction of radical.
The Research about Machining Technique of the Parts with Complex Curved Surfaces by WEDM
Authors: Wang Xin Rong , Li Xiao Hai
Published: July 2011

In this paper, analyze the motion rules of multiple-spindle linkage motion in machining complex ruled curved surfaces by WEDM. Sum up the motion parameters and motion types in machining various complex surfaces by WEDM. According to the basic principles of the forming of ruled surface in spatial analytic geometry, establish five-spindle linkage motion cutting system. Prove the correctness of the mathematics models by means of computer simulating. In turn, verify the correctness of the computer simulating by machining simple parts. Therefore, give the theoretical base for the application in production. Solve the problem in cutting parts with complex surfaces and widen the range of processing complex surface by WEDM. This method gets better application in model manufacture.
Modeling and Simulation of Five-Axis Milling Machine Based on ADAMS
Authors: Zhang Zai Chun , Zhong Gao Yan , Gao Yong
Published: July 2011

A method for motion control and analysis of five-axis milling machine was proposed by means of simulation. The method started from solid modeling of five-axis milling machine in PRO/E, and then imported the model into ADAMS, generating its own solid model, through seamless interface software Mechanism/Pro 2005. Therefore, co-simulation of PRO/E and ADAMS was realized. On the platform of ADAMS, constraints and drivers necessary for simulation was added to the solid model and the simulation was begun. During the simulation process, motion parameters of each head were produced, and these information directly provided a control basis for NC machining of five-axis milling machine. Thus, the performance study of five-axis milling machine through simulation was realized on the computer and it provided an effective method for the engineering design of the machine.
Numerical and Experimental Pore Network Study on Drying of Grain Materials
Authors: Yuan Yue Jin , Yuan Yue Ding , Zhang Man , Dong Ji Xian , Liu Xiang Dong
Published: July 2011

A pore network model for drying of grain materials was established on the base of pore network theory and transport process principle, and a corn drying experiment was conducted to verify the validity of this model. The experiment and simulation results indicated that this model could explain the drying process of grain materials well. There is a significant difference between the corn and pore vapor temperature, and it is unreasonable to confuse the two kinds of temperature. The particle size distribution has a great effect on the drying process. The higher the uneven degree of particle size distribution was, the slower the grain materials were dried and the more unbalanced the moisture distribution appeared.
Numerical Analysis of RPC-Filled Circular Steel Tube Columns
Authors: Wang Yan , Zhao Guan Yuan
Published: July 2011

Reactive Powder Concrete(RPC) is a cementitious material that exhibits high performance properties. Brittle failure mode usually appears when it is subjected to high or complicated stress. The fragility performance of RPC can be great improved if efficient confinement is provided. In this paper, four RPC-filled steel tube stub columns under axial loads were analyzed using the finite element program ABAQUS. Two different axially loading modes were considered. The analysis results were compared with the results of the tests. It was found that the FEM models can predict the force-displacement relationship of such columns with acceptable accuracy.
Finite Element Design and Numerical Simulation on Non-Pneumatic Beehive Damping Tire
Authors: Zhu Ge Gang , Xu Chen , Yi Long , Li Ning
Published: July 2011

The design and numerical simulation and analysis on non-pneumatic beehive damping tire were discussed in this paper by finite element techniques. And use the molding software filling its experimental to analyze the process of injection molding qualities for the reasonable mold design. And the corresponding improvement measures, the rationality of mold design and molding process were arised for quality issues according to the simulation analysis.
Effects of U-Shape Inner Cooler on Flow and Solidification of Molten Steel in Slab Continuous Casting Mold
Authors: Jin Yan Juan , Cui Xiao Chao , Zhang Zhu
Published: July 2011

An inner-outer coupled cooling technology of molten steel for 1240×200mm slab continuous casting, that is to set an inner cooler—U shape pipes in the mold, is put forward in order to enhance the efficiency of transmitting heat and improve inner structure of billet. The flow status and solidification status of molten steel under coupling flow field and temperature field in inner-outer coupled cooling mold are simulated by using fluid dynamics software, and compare with those in traditional mold. It is found that setting inner cooler in the mold can make molten steel flow status even, which is favorable to floating up of the inclusion, quickening the solidification of steel liquid and improving the quality of billet.
A Novel Amorphous SiGe Material Used in CMOS Device
Authors: Cui Wei , Xu Shi Lu , Li Ping , Ma Ting , Yang Yong Hui
Published: July 2011

In this paper, we propose a novel material- amorphous silicon germanium(a-SiGe). The a-SiGe film was formed by PECVD at a low temperature and a low frequency. By adjusting the fraction x of Ge in Si1-xGex, optimal SiGe bandgap was achieved. We used amorphous silicon germanium alloy as MOSFET source/drain. The parameter of MOSFET shows that, as the fraction increases, the drain-to-source breakdown voltage increases. With reduction of the minority carrier inject ratio, the current gain β of parasitic BJT in MOSFET was reduced greatly, which eliminates the limit of the breakdown voltage of the device.
Study of Splat Particle Temperature Distribution in Plasma Spray Forming
Authors: Zhao Zi Yu , Xia Bi Bo , Zhang Su Zhi , Wang Li
Published: July 2011

This paper studies the thermal interaction of Ni particle and Al particle setting in the carbon steel surface using ANSYS software by finite element numerical simulation. It highlights the temperature-time change of feature points that are at different locations of flattened particles and substrate, and micro-contact heat transfer of particle and substrate surface is also analyzed. The results help to study residual stress distribution of a splat particle in the plasma spray forming, which further provide an important basis for improving the quality of the coating.
Experimental Study of Drawing Load Curves in Forming Conical Parts by Hydroforming and Conventional Deep Drawing Processes
Authors: Norouzi Salman , Yaghoubi Amir Reza , Bakhshi-Jooybari Mohammad , Gorji Abdolhamid
Published: July 2011

Since conical parts have wide applications in the industry and forming these parts is one of the most complex and difficult fields in sheet metal forming processes, the study on different methods in forming these parts can be useful. Hydroforming and conventional multistage deep drawing are two deep drawing processes which have been used to form conical parts. Hydroforming deep drawing is one of the special deep drawing processes which have been introduced in order to overcome some inherent problems in the conventional deep drawing with rigid tools. In the present work, an experimental program has been carried out to compare the drawing load variation and maximum drawing load in forming pure copper conical-cylindrical cups with the thickness of 2.5 mm by hydroforming and conventional multistage deep drawing processes. The results of the study demonstrate that drawing load variation is more uniform in the forming of conical parts by hydroforming deep drawing process. The maximum drawing load for drawing copper blank occurs at a higher amount in hydroforming process.
Effect of Carbon Coating on Tensile Strength of SiC Filament by Chemical Vapor Deposition
Authors: Liu Cui Xia , Yang Yan Qing , Luo Xian
Published: July 2011

The tensile strengths of carbon-coated and non carbon-coated SiC filament by Chemical Vapor Deposition were tested, respectively, which were analyzed according to double-parameter Weibull distribution. Various techniques including XRD and SEM were also used to study the phase composition and microstructure of SiC filament. The result shows that carbon coating plays a very important role on increasing the tensile strength.
Application of Numerical Simulation in Stamping Process of Complex Box-Type Parts
Authors: Wang Guang Kai , Cheng Si Yuan , Li Su Yang , Zhang Xiang Wei
Published: July 2011

Due to the recent development both in the numerical simulation technology and computer technology, the role of numerical simulation in sheet forming industry has been continuously increasing in recent years. This paper describes the application of numerical simulation technology in the forming process of a complex box-type part with Dynaform and gives a fairly accurate forecast of defects that may appear in the forming process. Prediction of the effect of design parameters such as blank holding force and drawbeads on forming quality is investigated. The study indicates that blank holding force and drawbead directly affect the metal flow and formability of stamping. Then, by adjusting blank holding force and setting appropriate drawbeads, an optimized stamping process plan is obtained and is validated in experiments. Finally the phenomenon and displacement of distortion springback are predicted in the springback simulation, which is useful to further improve the quality of this kind of part.
Study of the Structural Characteristics of Mold for Precise Injection Molding
Authors: Li Hong Lin , Jia Zhi Xin
Published: July 2011

With the improvement of accuracy requirements for industrial products, the precise injection molding is replacing the traditional injection molding quickly and widely. Many factors influence the quality of injection-molded parts greatly, such as the property of the plastics, mold structure and the manufacturing accuracy, injecting machine and the injecting process parameters. In this paper, the work is emphasized for the influence of mold structure on the quality of injection-molded parts. Eight portions of injection mold are analyzed, including the cavities and cores, the guide components, the runner system, the ejection system, the side-core pulling mechanism, the temperature balance system, the venting system and the supporting parts. The structural characteristics of the above eight portions are presented.
Model Deduction of Rolling Tension Building Process
Authors: Zheng Shen Bai , Li Hong Bin , Wang Tao
Published: July 2011

Using elongation model by drawing force, a dynamic tension equation is directly established. The new tension formula has the peak in the early pulling intuitively based on the velocity difference, and considering not only the surface sliding change between the rolled-piece and the roll but also the motor inertia with load.
Effect of Corrosive Medium on the Corrosion Resistance of FeCrMoCB Amorphous Alloy Coating
Authors: Chen Qing Jun , Hu Lin Li , Zhou Xian Liang , Hua Xiao Zhen , Yang Ying Jun
Published: July 2011

The purpose of this study is to investigate the electrochemical properties of Fe44Cr16Mo16C18B6amorphous alloy coating fabricated using high velocity oxygen fuel (HVOF) technology in 2.0M HCl and NaOH solution at room temperature(25°C). Based on the potentiodynamic polarization curves and Electrochemical Impedance Spectroscopy(EIS) testing results of coating in aqueous solutions of HCl and NaOH, the corrosion resistance of Fe44Cr16Mo16C18B6amorphous alloy coating in HCl solution was superior to that in NaOH solution. The icorrwas 1.487×10-5A·cm-2in HClsolution and 1.107×10-4A·cm-2in NaOH solution, while the Rtreach to 5.789×104Ω·cm2and 9780Ω·cm2, respectively. On the other hand, these corrosion phenomenon could be better interpreted by R(Q(R(RQW)))(RL) and R(RL)(Q(R(CW))) equivalent circuit model, which were different from that of other Fe-based amorphous alloys in HCl and NaOH solution, respectively.
Study on the Rules and Effects of Wear on Die Service Life in Steel Synchronizer Gear Ring Forging Process
Authors: Zhao Jun , Yi Ji Ming , Luo Shan Ming
Published: July 2011

The die accuracy and die service life reduce due to die wear during precision forming processes of steel synchronizer gear ring. The most serious part of wear is the middle between two tooth shapes. The rules of the wear and initial die hardness and frictional coefficient are analyzed based on numerical simulation. It shows that the higher of the initial die hardness, the better antiwear and good lubrication is benefit to reduce wear and prolong the die service life. The effect of the temperature on die life is reflected through hardness. The relationship of die hardness and die temperature, forming time is deduced. The higher of the die temperature and the longer of the forging time, the more serious of die wear. To prolong the die life and improve the quality of forgings, the synthetic forming technology is adopted and the ejection way and control system of the Plate Friction Press are improved. Experiment verification shows that the die service life has been prolonged.
The Effect of Anisotropy on Spring-Back of CK67 Steel Sheet in L-Dies Bending Processes
Authors: Bazrafshan Jafar , Gorji A. , Armaky A. Taghizadeh
Published: July 2011

One of the most sensitive features of sheet metal forming processes is the elastic recovery during unloading, called spring-back, which leads to some geometric changes in the product. This phenomenon will affect bend angle and bend curvature, and can be influenced by various factors. In this research, the effects of sheet thickness and die radiuses an sheet anisotropy on spring-back in L-die bending of CK67 steel sheet were studied by experiments and numerical simulations.
Numerical Simulation and Optimization of Drawing for Shallow Tapered Surface
Authors: Ding Hong Yan , Xia Mu Jian , Zhang Yue , Zhou Guang Hong
Published: July 2011

It was hard to predict crack and wrinkle which are the main failure modes when drawing for the shallow tapered parts. In this paper crack and wrinkle can be avoided effectively by using the software DYNAFORM in combination with orthogonal design of experiment method. The influence of normal anisotropy coefficient, friction coefficient, drawbead resistance and blank holding force on deep drawing shallow tapered surface was analyzed by numerical simulation. The results show that the minimum-wall-thickness was the main criterion for the drawing process but not the only criterion. Crack and wrinkle can be moderately eliminated finally after optimization of the parameters and following trim process in the drawing for shallow tapered surface.
Studies on Diamond Brazing Process
Authors: Song Cheng , Hua Li , Wei Fa Can , Liu Jin
Published: July 2011

Through scientific experiments, we studied the binder, diamond, solder, uniform distribution and heating curves in brazing. We selected DH temporary binder, compared two kinds of diamond, selected the diamond with fine thermal stability. The experiments adopted diamond with uniform templates, experimenting 13 kinds of solder of which 9 were mixed with diamond for comparison of brazing effects and thermal damage. We optimized solder and brazing process and comprehensive analyzed experimental results. The analysis showed a small amount of DH temporary binder residue in brazing, fine effect in case of low alloy solder brazing temperature, better adhesion of solder and diamond achieved by elements formed by Cr and other strong carbides, sufficient volatilization of temporary binder and other impurities achieved by insulation before 500°C, heating rate of 1°C/min when the temperature it is higher than 20°C-50°C, the solder melting point, and that cooling should be carried out under high vacuum, brazing diamond should have fine thermal stability.
Studies on High Efficiency Diamond Trimming Saw Bits
Authors: Hua Li
Published: July 2011

Improvement of the service life and efficiency of trimming bits is the key to studies on metallic bond diamond saw bits. We conducted test of the preparation of layered trimming bits with different diamond and binder ingredient and sintering process with the results showing: hardness, cutting performance, strength, wear resistance and toughness of bits were improved through taking Cu as a binder phase, taking added small amount of Fe, Sn, Ni, Cr as additional binder phase to further improve the performance. After 3min insulation and sintering under 780°C, 50/60-mesh diamond hard phases are distributed on the bit alloy microscopic structure with 65Mn as the substrate. Combination of the flexible substrate and appropriately disperse hard phases achieves the improvement.
Temperature Field Simulation of Air Cooling Condition 40Cr ANSYS
Authors: Chen Lian Sheng , Leng Yan Hong , Han Yan Kai , Song Jin Ying
Published: July 2011

The latent heat’s releasing has effect on temperature dropping.. For example of 40Cr bar, using ANSYS finite element establish transient temperature field model in air cooling condition, and using Thermal compensation calculate latent heat can simulate cross-sectional temperature field in air cooling, obtain the temperature variation with time, this founds base for the quantitative description of the microstructure and properties of rolled steel.
The Use and Grinding of the New Configuring Finishing Hob
Authors: Hu Yong , Song Jingan , Wang Yu Lei , Xiang Ming Jun , Peng Fu Hua
Published: July 2011

This paper aimed at demonstrating advantages of a new configuring finishing hob. The features in use of the new configuring finishing hob was discussed. The advantages of the new configuring finishing hob was demonstrated. The principles that eliminate machining errors by modulating the mounting parameters, and that prolong the life span of the new configuring finishing hob were proposed. This paper is of great importance to the rationality in use, specifying tolerances, and excavating the potential of the new configuring finishing hob.
Studies on the Mechanical Property of Ring Nugget Formed in Sheet to Tube Joining
Authors: Liang Cai Ping , Sun Fang Fang , Liu Xiao Hang
Published: July 2011

Single sided resistance spot welding (SSRSW) developed from resistance spot welding (RSW) is a feasible plan to join vehicle structure to closed-form tube and is increasingly used in automobile manufacturing. A ring spot weld can be formed between the two workpieces during this process. The weld strength is critical to the performance of vehicle. The mechanical property of the ring nugget, however, is lack of attention. In this study, a simulation model of workpieces with ring nugget for tensile-shear test was established and the stress and strain distributions around the weld were researched in detail. It was found that the maximum stress is generally concentrated at the out edge around the ring nugget. The failure region, however, may be in the heat affected zone (HAZ) instead of in the place of maximum stress, which should be judged by stress failure criteria (SFC) in the model. In addition, the tensile stress and shear stress on the surface of the lower sheet and upper tube were illustrated.
The Prelimary Study of the Welds between Mg and Al by Friction Stir Welding
Authors: Chen Ying , Shen Chang Bin , Ge Ji Ping
Published: July 2011

The dissimilar welds between magnesium alloy and aluminum alloy formed by friction stir welding has been investigated. The results show that the cavity and tunnel defect often appear in the welds, and the formation of fragile intermetallic compounds which exhibit virtually no ductility and lower strength cause the poor property of the welds during FSW.
Determination of Optimal Recrystallization Annealing Temperature on Structural Hot Dip Galvanized Steel Sheets
Authors: Wang Min Li , Zheng Zhi Wang , Zhang Gong Ting
Published: July 2011

The salt-bath annealing was used to study the recrystallization of structural steels as well as the effect of chemical compositions on the microstructure and properties of structural hot dip galvanized steel sheets was investigated in term with the production condition of the No.2 hot dip galvanizing line in Pangang. The optimum annealing temperature range was determined. Experimental results show that the recrystallization temperature of Grade40 and Grade33 is approximately 720°C and 680°C, respectively. Considering the stability of mechanical properties, their optimum annealing temperature are determined to be approximately 720°C. The recrystallization temperature of Grade50 is above 700°C. In order to ensure the margin of strength and the stability of properties of Grade50, the optimum annealing temperature is approximately 780°C.
Evaluation Study on Angular Distortion and Residual Stress of Stainless Steel Pulsed TIG Weldment
Authors: Tseng Kuang Hung , Sung Hsiang Lin
Published: July 2011

The aim of this study was to investigate the effect of pulsed current welding parameters on angular distortion and residual stress of TIG weldment. Autogenous TIG welding was applied on type 316L stainless steel sheet to produce bead-on-plate welds. Angular distortion was determined using the mean vertical displacement method. Residual stress was determined using the hole-drilling strain- gage method. The results showed that the pulsed current TIG welding has a number of advantages, including lower heat input and consequently a reduction in distortion and residual stress of weldment.
Effect of Physical Simulation Thermal Parameters on Microstructure Transition and Property Variation of Boron Steel
Authors: Han Kun , Li Qing Shan , Zhang Mei , Fu Ren Yu , Li Lin
Published: July 2011

Different physical simulation welding parameters were performed using Gleeble-3500 type thermal simulator to research the effect of thermal cycle on microstructure transition and property variation of boron steel 22MnB5. The peak temperature of welding thermal cycle was set to 1320-870°C, and cooling rates t8/5 to 6s-100s. Then microstructure observation, hardness detection, and impact toughness tests were carried out to clarify the effect of different thermal cycles. The results show that 22MnB5 has good mechanical properties, but the toughness decreases obviously under certain thermal cycles, showing cold crack sensitivity of 22MnB5. Martensite and ferrite are the main microstructure under different peak temperature and t8/5.
The Chemical Reactions in Solution Synthesis of Aluminum Alloy Brazing Fluorate Flux
Authors: Cheng Fang Jie , Jin Wen Shan , Wang Ying , Wang Dong Po
Published: July 2011

Based on experiment, preparation method, formation mechanism and reaction process in was studied ,in which phase analysis was adoped. melting method and wet synthesis are separately used to produce ternary flux.it has been found that product will be different by using the method of steaming and filtering in the process of preparing Potassium fluoroaluminate. K2AlF5 is very easy to get as well as Cesium fluoroaluminate.Result of ternary flux is not the way we hoped it would be for the melting point is above 520°C.
Interfacial Reaction of Alumina Ceramics to Mild Steel Braze Joint
Authors: Li Zhuo Ran , Wu Guang Dong , Zhang Xiang Long , Fan Jian Xin , Feng Ji Cai
Published: July 2011

Al2O3 is brazed with mild steel using 70Ag-27Cu-3Ti (wt.%) active filler alloy at 900°C for 5 min. The interfacial reaction products are analyzed with X-ray diffraction (XRD)．The interfacial phases are analyzed with EDAX. According to the experimental observations, the interfaces developed during brazing have been systematically characterized and the structure are separately Ti3Cu3O/Ti3Al+ TiMn+TiFe2 +Ag(s,s)+Cu(s,s)/TiC from alumina ceramics side to mild steel side.
Documentation and Analysis of Sustainable Design and Apllication of Tanggam System in Malay Traditional House
Authors: Sabil Azmal Bin , Utaberta Nangkula
Published: July 2011

‘Tanggam’ system is a main method of joining woods which is applied in Malay traditional building. it works by connecting two small components of a building and yet combining it to form the main structure of the building. there are only small numbers of writing that discuss in tanggam available in malaysia and most of the discussion are focusing on methods of producing tanggam, the types and application of tanggam in construction. In order to conserve this great heritage, the area of study need to be widens to others scopes. This is the way to maintain the use of tanggam in future. Generally, the ‘sistem tanggam’ varies in design, functions and strength where the strength of the tanggam is mainly depends on the tanggam connection design. In this study, a typology framework is created based on the previous writing on tanggam system. This typology will try to connect the design, the strength and also the area of application of the tanggam in Malay building.
The Friction Interaction Mechanism of Welding Seam Identifying Based on Force Sensing
Authors: Liu Lijun , Li Xian Yi , Gao Hong Ming
Published: July 2011

The welding seam identifying(WSI) is one of remote welding precondition. The welding seam is usually identified by vision sensor. The investigation on WSI based on force sensing is less reported. Because the interaction mechanism of friction is not clear in 6 dimension(6D) force of WSI, the influence of friction on the WSI feed and direction is studied. The experimental results show that the friction will decrease the WSI feed in XSY plane and increase in Z direction, but they is in range permitted by WSI. The friction makes WSI feed direction point to the middle of welding seam track, and do not influence WSI. Above technologies, The WSI of S groove is achieved. The average deviation of WSI is less than ±0.5mm when there is friction in 6D force of WSI. It can meet the precision of WSI in remote welding.
Effects of Nd: YAG Laser Welding Parameters on the Microstructure of 21% Cr Ferritic Stainless Steel
Authors: Geng Ke Ping , Hu Sheng Sun , Shen Jun Qi , Han Jian , Xu Hai Gang
Published: July 2011

21% Cr with Ti-Nb dual stabilized ferritic stainless was welded using Nd: YAG laser. The relationship between microstructure and parameters of laser welding was examined. The microstructure was investigated by using the optical microscope and scanning electron microscopes. The average grain size of the HAZ was increased with increasing heat input due to the slow cooling rate. Large precipitates as TiN, TiC and Nb(C,N) were dissolved in the HAZ. Fine precipitates which supposed to be TiC was formed uniformly distributed in the case of the fusion zones.
The Effect of Plasma Treatment on the Performance of Poly(lactide-Co-Glycolide) Fiber
Authors: Guo Zheng , Chen Jin Jing
Published: July 2011

In this paper, Poly(lactide-co-glycolide) (PGLA) fibers were treated with the plasma. The surface, tensile strength, and contact angle with water of the PGLA fiber were investigated. The results showed that the PGLA fiber after treatment possessed more rough surface and smaller contact angle with water compared with the untreated fiber, but the tensile strength of fiber after treatment was not significantly diffrent form the fiber before treatment. In addition, both the treated and untreated PGA fibers were placed in phosphate buffer solution (PBS) (pH=7.4) at 37 °C up to 2.5 weeks to investigate the effect of plasma treatment on the degradation in vitro. Changes in tensile strength during degradation was investigated. The results showed that the treated PGLA fiber degraded faster compared with the untreated fiber.
OH-related Infrared Absorption Spectra in Silicate Glasses
Authors: Liu Xiao Qing , Xie Jun Lin
Published: July 2011

To discover the water structure in glass, two silicate glasses were synthesized under different melting atmospheric conditions. Fourier transform infrared spectrometric analyzer was used to study the OH contents and the infrared spectra bands in 1300-4000cm-1of the glasses. The research shows that water contents of glass samples melted under air atmosphere and oxyfuel firing atmosphere are 0.0323wt% and 0.0512wt% respectively. The infrared absorptions in 1300-4000cm-1band are dominantly related with water dissolved in glass melt. Water existing in glass is mainly in the form of Si-OH, in addition with some free OH connected with metal cations. The IR absorption of ferrous ion in glass is near 3430cm-1, while the IR absorption near 2500 cm-1does not belong to the vibration of KOH.
Optimization Design of Signal Source Based on FPGA
Authors: Zhang Hui Xin , Chen Yan Ran , Zheng Yan Lu , Ren Jian Yun
Published: July 2011

In the aerospace test, Signal source is the core component. It provides various signals what are needed by test. However signal transmission’s reflections and noise always cause interference. It will impact the accuracy of signal. Therefore, the precision, stability and reliability of signal source in space telemetry experiment are very important. This paper adopts FPGA + AD768 to achieve a precision, stability signal source. By the assessment test, this system is proved to be feasible and stable.
Kinetics of Reductive Dechlorination of DDT in Soil with Zero-Valent Iron
Authors: Lang Yin Hai , Wang Min Jie , Wang Nan Nan
Published: July 2011

In this study, reductive dechlorination of DDT compounds by zero-valent iron in Jiangxi red soil was investigated. DDT compounds were effectively dechlorinated by zero-valent iron. The pseudo-first-order kinetic model for 2,4¢-DDT and 4,4¢-DDT reduction with zero-valent iron was proposed. The reaction rate constants for 2,4¢-DDT and 4,4¢-DDT were 1.19´10-2(min-1) and 1.44´10-2(min-1), respectively. The dechlorination of 2,4¢-DDT and 4,4¢-DDT were mainly affected by the specific surface area of iron. The data from the variable-pH experiments (between 3.6 and 8.8) suggested that pH does not play a role in the rate-determination step.
Evaluation of Optical Path Designing on 4x4 Cm2 Er3+/Yb3+ Doped Phosphate Glass Waveguide Substrate
Authors: Tian Miao , Zhao Xin , Zhou Zheng Yang , Lin Hai
Published: July 2011

To achieve high-gain C-band waveguide amplifiers with integrated configuration, bent channel structures (S-, U-, and F-bend) based on buried Er3+/Yb3+ codoped phosphate glass waveguide channel fabricated by field-assisted annealing (FAA) have been designed in a 4´4 cm2 substrate. Using simulated-bend method, the optimal radius for the curved structure is derived to be 1.00 cm with loss coefficient of 0.0045 dB/cm. In the wavelength range of 1520-1575 nm, obvious gain enhancement for the bent structure waveguides is anticipated, and for the F-bend waveguide, the net gain at 1534 nm wavelength is derived to be 43.95 dB, which is much higher than the value of 26.67 and 13.20 dB in the U- and S-bend waveguides, respectively, and over three times higher than that of the straight one. The simulation results indicate that the bent structure designing is beneficial in obtaining high signal gain in buried Er3+/Yb3+ codoped phosphate glass waveguides, which lays the foundation for the further design and fabrication of integrated devices.
Load-Carrying Capacity Analysis for Sinusoidal Surfaces Hydrodynamic Bearing
Authors: Yang Jian Xi , Zhang Fa Yu , Liu Jian Ting , Zhou Jian Fang
Published: July 2011

To obtain a new method to improve hydrodynamic bearing carrying capacity, hydrodynamic journal bearing’s characteristics as well as the current study direction are analyzed. According to the calculation of general cylindrical hydrodynamic journal bearing, the mathematic model for sinusoidal surface hydrodynamic bearing’s carrying capacity is established. It is used to calculate, analyze and compare these two bearings’ carrying capacity with example. The bearing, which has the characteristic of sinusoidal surface, has stronger carrying capacity than general cylindrical hydrodynamic bearing. What’s more, the improvement is more obvious when the number of waves is 3, also it has wider carrying area. Compared with other journal bearings, the journal bearing with sinusoidal surfaces has stronger carrying capacity, smaller friction moment and longer life-span. Therefore, it has extensive prospect.
Preparation and Ferroelectromagnetic Characteristics of Bi2SrNdNb2FeO12 Ceramic
Authors: Sun Xiao Liang , Shi Jing , Ma Guang , Li Jin
Published: July 2011

The solid solutions of NdFeO3-Bi2SrNb2O9 (1:1ratio) of the Aurivillius-type compounds was prepared by solid-state reaction. The room structural data were obtained from X-ray diffraction (XRD) and confirmed a Three-layered Aurivillius phase. The dielectric measurement showed no anomalies due to the high conductivity of these samples at elevated temperature. From the magnetic measurement the compounds were found to be of canted antiferromagnetic at room temperature. It is revealed that the formation of Fe2+ can be suppressed by the pre-oxidation of Fe2O3，This result may have implications for further studies on leakage current control of these materials. In all, we’ve synthesized a new material that is ferroelectromagnetic in nature.
New Method of Spherical Surface Defect Detection Based on Machine Vision
Authors: Yang Jian Xi , Zhang Fa Yu , Song Xiao Xia , Xu Hong Zhe
Published: July 2011

According to requirements of online steel ball surface defect inspection, the automatic detection method of spherical surface defect on the track has been posed. To ensure photographing of the whole steel ball surface, the six CCD video cameras are used in this system. To overcome steel ball surface reflection, the red LED light source is used, and then the real and clear images are got. The steel ball surface defect is recognized accurately by means of image recognition technology and image reconstruction technology etc. This method provides theoretical basis and technical support for ball defection and quality classification.