bluuebunny/crossref_metadata_2025 huggingface dataset:
The Application Research of Web3D-Based Virtual Reality Technology in Modern Distance Education
Authors: Wang Tao , An Wen Guang
Published: July 2011

Web3D technology is an implementation of virtual reality technology in the form. This paper researches the theory and mainstream technology of the virtual reality based on Web3D technology, and explores the application of virtual reality technology in distance education, thus to further promote the development of online teaching.
The Design and Implementation of Web2.0-Based Virtual Network Lab
Authors: An Wen Guang , Wang Tao
Published: July 2011

Experimental teaching is an important way to cultivate students’ professional qualities. This article first gives an account of the background and significance of developing virtual network lab, and then puts forward a solution to design and implementation of the lab based on the design concept of Web2.0.
Zinc-Doping in TiO2 Films to Enhance Photovoltaic Performance of Dye-Sensitized Solar Cells
Authors: Liu Qiu Ping , Zhou Yang , Duan Yan Dong , Lin Yuan
Published: July 2011

Dye-sensitized solar cells based on Zn-doped TiO2 thin film prepared by the hydrothermal method show a photovoltaic efficiency of 7.68%, which is higher than that of the undoped TiO2 thin film (6.16%). The Zn-doped films exhibit an elevated electron Fermi level,which may enhance band bending to lower the density of empty trap states.Because of this Zn-doping,the consequent Dsscs can alleviate the decay of light to electric energy conversion efficiency due to light intensity reduction. Intensity-modulated photocurrent spectroscopic analysis reveals that enhanced transport of photogenerated electrons as a result of the trap density minimization is responsible for the high photovoltaic performance.
A Practical Algorithm for Plagiarism Detection Based on Search Engine
Authors: Qiu Zhuang Li , Xu Dong Ling
Published: July 2011

In the current background of quantitative academic evaluation system in China, many scholars, graduate students are tend to plagiarize from web. To detect plagiarism efficiently, there should be a massive text collection which could be accessed easily, cheaply and quickly. Some algorithms refer to the quickly developing online database, such as Chinese CNKI database. We introduced an algorithm to detect plagiarism quantitatively based on natural language segment and precise retrieval function of search engine. The source text is segmented into sentences with punctuation marks. Each sentence is searched in search engine as a single keyword with quotes. The similarity between source file and web information is computed by the ratio of matched sentences return by search engine. The experiments show that this algorithm is practical and feasible.
The Present Situation and Opportunities of China’s Colleges and Universities Network Physical Education
Authors: Cao Dong Ping , Lu Nian Ci , Li Chang Xin
Published: July 2011

Network education is a new form of modern open education. In China, after 10 years of development, network education has manifested its predominant functions and great advantages in modern higher education. Starting fairly late, although score several achievements among colleges and universities, network education still has many drawbacks. Gazing into futurity, it is beyond dispute that college network physical education will be faced with enormous development opportunities as well as Challenges.
Theoretical and Empirical Study on Deepening Reform of School Physical Education in Modern Education Technology Environment
Authors: Zhai Lin , Zhai Yin Fei
Published: July 2011

The paper understands the essential characteristics of modern educational technology, analyzes the necessity and feasibility of deepening the reform of school physical education and proposes the thinking of making use of modern educational technology to build new sports teaching mode so as to provide theoretical basis and practical guidance for promoting the application and development of modern educational technology in school physical education.
Theoretical Research on University Outward Bound Curriculum System
Authors: Zhu Xin Hua
Published: July 2011

This paper uses the methods of documentary, interview, and inductive analysis and so on; give a profound research on the meaning, property, the construction of curriculum system, the formulation of teaching outline of outward bound curriculum. Aim to establish a outward bound curriculum system which helps to cultivate students’ attic faith, strong self-confidence and brave strong will; formulate a outward bound curriculum teaching outline which can effectively promote the implementation of the outline, can carry out reform and innovation of the traditional P.E. class.
The Current Situation and Countermeasures of Our National Competitive Basketball Capital Input and Earnings in the Period of Transformation
Authors: Xu Ping
Published: July 2011

In the period of transformation, the current situation and countermeasures of our national competitive basketball capital input and earnings is that the sources of fund tend to be multi-facetted, but the right of property is not clear enough; the way of profit is various, but the amount is limited. Therefore, we should accelerate the process of our national basketball professionalism, make the most of the tangible and intangible assets of basketball, look for many other ways of financing actively, and at the same time, use the successful operation experience of NBA industry as a source of reference.
The Research on Assembly Angle Measurement of Cylinder Rod Located at ICF Target
Authors: Xu Xiao Jie , Dong Xi Yan
Published: July 2011

Aiming at the installation angle measuring requirement of cylinder rod located at some kind of laser target for inertial confinement fusion, a non-contact five-coordinate measuring machine is exploited and built. According to the projection characteristic of spatial line, the mathematical model of spatial angle between the cylinder rod and support rod is established. Combining with image processing technique, the angle measurement issue between spatial lines can be dexterously transformed into the plane image processing problem. Based on this projection method, the direction vector of cylinder rod centerline can be obtained by testing the cylinder rod from two perpendicular directions with CCD camera. LOG operator is applied to detect the edge of image, which is able to reach single-pixel positioning precision. Furthermore, the application of sub-pixel detecting method based on least squares linear regression can further improve the positioning precision of image edge. The experiments illustrate the measuring accuracy of angle can reach 0.1 degree with the projection method.
A Comparison between B4C-TiB2-Al Composite and B4C-Al Composite on Microstructure and Mechanical Properties
Authors: Lü Peng , Yu Fang , Ru Hong Qiang
Published: July 2011

B4C-Al and B4C-TiB2-Al composites were fabricated by infiltrating aluminum into porous B4C and B4C-TiB2preforms in vacuum. The effect of TiB2addition on the microstucture and mechanical properties of the B4C-Al composites were investigated. The flexural strength and the fracture toughness of composite improved greatly as the result of TiB2addition. The TiB2addition inhibited the reaction between B4C and Al. The infiltrated aluminum addition was the leading reason for the fracture toughness improvement of the composites. Inter/transgranular fracture mode with many tear ridges and dimples was showing in the fracture surface of the B4C-TiB2-Al composite. The relationships between the microstructures and the mechanical properties of the B4C-TiB2-Al composites were discussed.
Predictive Control of a Cable-Stayed Bridge under Multiple-Support Excitations
Authors: Yan Gui Yun , Zhang Zheng
Published: July 2011

This paper presents a predictive control strategy for seismic protection of a benchmark cable-stayed bridge with consideration of multiple-support excitations. In this active control strategy, a multi-step predictive model is built to estimate the seismic dynamics of cable-stayed bridge and the effects of some complicated factors such as time-varying, model mismatching, disturbances and uncertainty of controlled system, are taken into account by the prediction error feedback in the multi-step predictive model. The prediction error is that the actual system output is compared to the model prediction at each time step. Numerical simulation is carried out for analyzing the seismic responses of the controlled cable-stayed bridge and the results show that the developed predictive control strategy can reduce the seismic response of benchmark cable-stayed bridge efficiently.
Realization of Crane's Online Safety Assessing System Based on B/S Structure
Authors: Qian Ni Jun , Cheng Qiu Ping , Liu Zhi Yun , Dong Xiao Rui
Published: July 2011

A crane’s online safety assessment system is introduced in this paper, which adopted the 3-tiers structure, dotnet and sql technology. The system implemented the hazard risk identification, risk assessment publishing, publicity function of safety culture, rights management, and system maintenance. The system is running smoothly which verified that the designing method is effective and feasible.
Directed Control for the Thermal Diffusion Fractal Growth of Thin Plate
Authors: Zhang L.
Published: July 2011

A new theoretical model for the directed thermal diffusion fractalgrowth of thin plate with environmental disturbance is considered to control thediffusion direction. Using the norm theory, a quantitative relationship of such anoptimal control problem is obtained, and the following simulations show that therelationship controls the diffusion direction effectively. In addition, the comparisonof the dimensions between the diffusion with round controlled region and thegrowth with piecewise region illustrates that the controlled regions play differentroles in the real complex fractal growth.
The Effect of Two Fault Segments Sliding Velocity on Strong Earthquakes
Authors: Bai Yu Zhu , Xu Xi Wei , Xu Jie
Published: July 2011

For researching the strong earthquake recurrence period of Kusai Lake and Xidatan fault segment in different sliding velocities, we apply the spring-block model (or BK model) controlled by the velocity and state depended frictional constitutive. Through numerically solving the one order differential equations picturing the block (or fault segment) motion, the parameter charactering the fault segment motion is achieved. Finally, we find the recurrence period of strong earthquake is shorter in fast sliding velocity than that in slow one. The 0.1 mm changing of fault segment sliding velocity per year will make the several hundreds years of variation in strong earthquake recurrence period.
The Research on Mechanism of Post-Earthquake Property Disposal — Example of Beichuan
Authors: Pi Xing Can , Xie Xiao Qing , Liu Yun Lang , Lu Hai Jian , Li Guan Nan
Published: July 2011

Post-earthquake restoration and reconstruction work is a huge social project, the disposal of post-earthquake property is a complex and urgent issue. At present, the research on this area is still in a preliminary stage. By means of comparative studying on domestic and international documents, this paper classified the post-earthquake property, through the case study of Beichuan and field test of local post-earthquake property disposal situation, analyses the problems existing in the current mechanism, puts forward a scientific and rational suggestions, expecting to solve the problems and conflicts, promoting social stability and development in earthquake stricken area.
Based on Risk Source Tanks Leakage Adaptive Strong Magnetic Emergency Device and Sealing Method Research
Authors: Yan Hong Wei , Kou Zi Ming , Gao Bo , Wu Juan , Wang Xian Hui
Published: July 2011

Along with the rapid development of chemical industry and the progress of science and technology, a large number of risk source tanks safe hidden trouble, this paper there with the present risk source leaking take on the basis of conventional containment measures, design a kind of adaptive strong magnetic emergency device, and introduces its rapid sealing method, it includes the rapid adjustable bits institutions, strong magnetic containment institutions and pressure, it is in switch diversion institutions with eternal magnets, universal of dynamic compaction ring and soft rubber balloon as sealing the ductility of the original, using rubber sealing, universal and with dynamic pressure locking ring with the move in all directions, adapted to the storage tank of planar, curved surface, large pipe outside surface and so on the different radius of curvature of the leak sealing kiss magnets, and simple structure, convenient operation, satisfy the production equipments of chemical industry and gas liquid storage facilities outside surface leakage occurs rapidly blocked.
Design of Solar Energy Photon-Thermal Conversion Thin Film System
Authors: Wang Wen Liang , Rong Xiao Hong
Published: July 2011

A high-absorption of thin film system used for solar energy photon-thermal conversion is designed. Which is composed of four function parts with metals and dielectric materials. The result of design show that it has a very high absorption over 95% with wide working wavelength range from 400nm to 1000nm and incident angle from 0oto 60o.
Non Ferrous Melting by Gas
Authors: Prasertsook Somsak
Published: July 2011

The most popular non-ferrous melting in Thailand is melted by using oil crucible furnace however since in the year 2004 we have faced the oil crisis situation oil price became expensive that made the production cost was rising up so we have designed and constructed new one crucible furnace which used LPG gas to be fuel the capacity of furnace is 40 kilograms for aluminium melting after that we tested to find out the melting rate and fuel consumption for cost comparison between diesel oil using and LPG gas using and we have got the result that new LPG furnace could save production cost more than diesel oil furnace it mean could make more profit for producers.
Vibration Characteristics of the Non-Conservative Thermoelastic Coupling Plate
Authors: Guo X. X.
Published: July 2011

The vibration characteristics of the thermoelastic coupling rectangular plate under the action of uniformly distributed tangential follower force are investigated. The coupled thermoelastic differential equation of the plate under the action of uniformly distributed tangential follower force was derived. Dimensionless complex frequencies of the thermoelastic coupling rectangular plate with one edge clamped and other three edges simply supported, two opposite edges simply supported and other two edges clamped were calculated by the differential quadrature method. The effects of the dimensionless thermoelastic coupling factor on the stability and critical load of the thin plate were analyzed. The results show that the flutter loads of the coupled modes increase with the increase of the dimensionless coupled thermoelastic factor and the aspect ratio.
Probabilistic Study on Corrosion Damage Distribution and Fatigue Lives of LY12CZ Aluminum Alloy Structure
Authors: Yu Da Zhao , Chen Yue Liang , Yong Zhang , Fan Qing He
Published: July 2011

A probabilistic neural network was developed to classify corrosion damage depth ranges based on the aluminum alloy failure mode. The results obtained indicate that corrosion damage depth for aluminum alloy can be classified into three groups. Statistical study on classified corrosion damage was carried out. The results show that pitting corrosion depth for aluminum alloy is in conforms to Gumbel distribution. The normal distribution fits well with intergranular corrosion depth and the exfoliation corrosion depth is consistent with Weibull distribution law. It may be necessary to use several distribution functions rather than a single distribution to represent corrosion damage characteristics due to the large distribution of corrosion depth in aircraft materials. According to corrosion damage depth distribution, corrosion depth was simulated by Monte Carlo method and used as the starting crack size. Fatigue lives were estimated by using a life prediction program AFGROW and the results are in good agreement with the experimental data. A probabilistic analysis shows that the distribution of fatigue lives is strongly correlated to the distribution of corrosion damage depth and should be classified into several groups to study.
The Comparison of Oil Quality from Different Processes
Authors: Li Yang , Jiang Lian Zhou , Wang Chen , Sui Xiao Nan
Published: July 2011

In this study, different oil extraction processes, such as extrusion pretreatment, ultrasound-ethanol assisted demulsification and traditional hexane extraction of oil, were employed to extract oil from soybean in order to compare their different effects on oil quality, fatty acid distribution and VE content of oil. The result shows that the quality of oil from extrusion pretreatment aqueous enzyme extraction (EAEP) of oil and ultrasound-ethanol assisted demulsification aqueous enzyme extraction of oil were same. The raw oil quality from the above two processes was better than the hexane extraction of oil. The fatty acid contents of oil were similar in different oil extraction processes. The VE content of oil from ultrasound-ethanol assisted demulsification process was decreased, while the extrusion pretreatment aqueous enzyme extraction of oil had no influence on VE concentration.
Effect of Temperature on the Corrosion Resistance of QPQ Treated Specimens in CO2 Environment
Authors: Li Yuan Hui , Zhang Shi Ping , Wang Jing , Ding Yi Chao
Published: July 2011

When the pressure of CO2 is 2 MPa, through the autoclave corrosion tests of annealed N80 steel specimens in simulated oil field water solution at different temperature, the mechanism of corrosion and the change rule of corrosion resistance with the change of temperature were discussed. In the autoclave tests, some iron elements of the specimens become Fe2+ions and the Fe2+ ions go into the solution, which results in the corrosion weight loss. Scaling develops because the CO32- ions in the simulated oil field water solution react with iron elements of the specimen. To QPQ treated specimens, with the increase of temperature, the compactness of the scaling increase, the corrosion weight loss and the weight of scaling decrease. In the same temperature, the corrosion weight loss and the weight of scaling of QPQ treated specimens are both lower than that of untreated specimens.
Analysis of Hinge System for Large-Scale Hydraulic Radial Gate
Authors: Peng Wei Ping , Zeng Wei Cheng , Zhang Zhi Qiang , Xia Re
Published: July 2011

As the key components of large-scale hydraulic radial gate, hinge system play an important role in supporting the gate and sustaining loads. They must satisfy the requirements of intensity, rigidity and supporting stability. Due to the complicated working conditions of the gate, it is difficult to calculate stress and strain of the hinge system based on traditional design method. In this paper, taking the radial gate in Silin hydropower station as an example, finite element technology is introduced into the analysis of the hinge system. The approach of this work includes steps of (1) obtaining the maximum load of the hinge system by analyzing and comparing different working conditions of the gate, (2) modeling the hinge system by meshing, loading and boundary constraints, and (3) computing stress and strain of its major components under the most dangerous condition. The results verify design feasibility and structural reliability of the hinge system.
Microstructure and Properties of Mg-6Zn-6Al-0.5Mn-0.6Si-0.1Ca Alloy
Authors: Zhang Bao Feng , Jiang Ai Yun , Li Zhi , Chen Xiao Wei
Published: July 2011

The Mg-6Zn-6Al-0.5Mn-0.6Si-0.1Ca alloy has been produced in a steel crucible in an electric resistance furnace protectived by CO2+0.5%SF6. The microstructure of the as-cast alloy consisted of matrix–α(Mg) supersaturated solid solution, τ(Mg32(Al,Zn)49) ternary-phase and a small polygonal type Mg2Si phase in matrix. The τ(Mg32(Al,Zn)49) ternary-phase dispersion distribution in grain boundaries. After solution-treated, the amount of quasi-continuous net-shape ternary-phases reduce and small part of ternary-phases dissolve to the matrix which lead to the distribution on the matrix more uniform than as-casting condition in the alloy. The results of tensile, microhardness, impact toughness and corrosion property show that the alloy has better compressive properties.
Free Vibrations of Beams with Arbitrary Boundary Conditions Based on Wave Propagation Method
Authors: Li Wan You , Zhou Hai Jun , Dai Jun , Lv Bing Lin , Wang Dong Hua , Gao Zhan Bin
Published: July 2011

Under the Euler-Bernoulli beam theory, the wave propagation method is used for the vibration analysis of beams with arbitrary boundary conditions. The boundary conditions end the beam could be arbitrary that all the conventional homogeneous beam boundary conditions can be included by setting the stiffnesses of the springs be infinity or zero. In this paper, the flexural displacement of the beam is expressed in the wave propagation form including wave numbers. The wavenumber could be obtained in a known form for conventional boundary conditions. So the results are obtained through the boundary conditions and the known wavenumbers and compared with the numerical results. In order to validate the correctness, results with different stiffness are compared with those obtained by previous published papers.
A Templated Carbon Prepared by Using a Clinoptilolite-Ca Mineral as Template and Furfuralcohol as Carbon Source: Pore Structure and Electrochemical Performance in H2SO4
Authors: Liu Gui Yang , Guo Jun Ming , Zhang Lili , Wang Bao Sen , He Ying
Published: July 2011

A templated carbon has been prepared by using a clinoptilolite-Ca mineral as template and furfuralcohol as carbon source. X-ray diffraction (XRD), nitrogen adsorption, scanning electric microscope (SEM) and cyclic voltammetry (CV) are used to analyze the phase composition, pore structure, micro morphology and electrochemical performance. The specific surface area of the templated carbon is 590m2/g and the mesoporosity is high to 63.4%. In H2SO4 medium, due to its rich mesopores, the carbon exhibits a large capacity and a good rate capability. The capacity of the carbon is 174F/g at a scan rate of 5mV/s. When the scan rate increases from 5 to 300mV/s, the capacity of the carbon decreases only from 174 to 144F/g, exhibiting a good rate capability.
Effect of Further Calcination on the Phase Structure of LiMn2O4 Prepared by a Solution Combustion Synthesis
Authors: Liu Gui Yang , Guo Jun Ming , Wang Bao Sen , He Ying
Published: July 2011

In this paper, LiMn2O4 materials were prepared by a solution combustion synthesis method using acetate salts as raw materials and acetic acid as fuel. The effect of further calcination at 500°C and 600°C on the phase structure and composition were investigated. The composition and phase structure are determined by X-ray diffraction (XRD). XRD results indicated that the main phase of the products was LiMn2O4,and there was a trace amount Mn2O3 impurity in the products prepared at 500°C and 600°C. The impurity Mn2O3 in the products prepared at 500°C is increased with increasing calcination time, but the Mn2O3 in the products prepared at 600°C is decreased. The grain sizes of the products prepared at 500°C and 600°C are increased with increasing calcination time, and the grain sizes of the products prepared at 600°C are larger than these of the products prepared at 500°C. The lattice parameters of the products prepared at 500°C and 600°C are smaller than that of LiMn2O4 with perfect crystal, and the lattice parameters of the products are more close to that of LiMn2O4 with perfect crystal.
Road Curve Speed Control Engineering Study
Authors: Liu Xing Wang
Published: July 2011

Horizontal curves have been recognised as a significant safety issue for many years, a more important factor than road width, vertical clearance or sight distance. This study investigates the issue of speed selection through curves from several different perspectives. The relationship between safety and curve speed in SiChuan provinces was analysed using data from the local crash database. A sample of curves was selected and surveyed. Following this, acurve treatments for controlling Curve speed for different vehicles was developed based on many factors that has influence on safey.
Research on a Fault Diagnosis Method for Aero-Engine Based on Improved SVM and Information Fusion
Authors: Wu Wen Jie , Huang Da Gui , Dong Zheng
Published: July 2011

This paper describes a support vector machine(SVM) approach to improve the test validity and accuracy for Aero-engine fault diagnosis. A new concept called classification rate has been introduced. The paper presents a new information fusion fault diagnosis method based on SVM. The diagnostic decision rules have been improved and applied to aero-engine gas path fault diagnosis. The test result manifests SVM has distinguish limitation to a strong linear correlation of two types of fault samples, it may also have diagnostic difficulties caused by Maximum number of classifications. Therefore, this paper has then proposed a corresponding solution. The simulation results verify that the method is feasible and it can reduce the defect caused by small sample data. It has high capacity of resisting disturbance and high accuracy.
Application of Open Source Software Image-J in Microscopic Movement Tracking: Movement Track Reconstruction and Parameter Algorithms
Authors: Liu Guang Xu
Published: July 2011

Since movement is an important characteristic of micro-motile cells, the development of microscopic movement tracking techniques is in urgent demand. To meet this need, applications of open source software Image-J in microscopic movement tracking were illustrated with examples. Movement track reconstruction was performed in both circular and linear movement patterns. The algorithms of real time radius, VCL (curvilinear velocity), VAP (average path velocity), VSL (straight line velocity), and other descriptive parameters using original coordinate values were developed and/or explained. Microscopic movement tracking can now be conducted at low cost using Image-J. Moreover, the algorithms can be easily controlled to fit users’ study purpose.
Magnetron Sputtering Applied in Shape Memory Alloys Preparation
Authors: Shi Jia Zi , Chen Chuan Zhong , Dang Xing
Published: July 2011

Shape memory alloys (SMAs) thin films have attracted much attention in recent years as intelligent and functional materials because of their unique characteristics. The sputtering thin films have been attracted great interest as powerful actuators in microelectromechanical systems (MEMS) such as microvalves, microfluid pumps, and microgrippers. Amongst SMAs, the equiatomic TiNi compound is the most widely used. In this paper, TiNi films prepared by magnetron sputtering are reviewed. The influence of parameters including thickness, target, substrate temperature and work pressure on the microstructure and properties of TiNi films are analysised. In additionally, several TiNi based ternary alloys films such as TiNiCu films, TiNiPd films and TiNiPt films are introduced. At last, the research direction of SMAs thin films is presented.
Inversion Analysis of Three-Dimensional Geostress Field in the Second Stage Project of South-to-North Water Transfer
Authors: Pei Qi Tao , Li Hai Bo , Liu Y.Q. , Yang Feng Wei
Published: July 2011

Focus on the topography features of V-shaped deep river valley in Ada dam area, the influence of intensively, moderately and slightly weathered stratum as well as the action of river valley erosion on geostress field was considered. Then, the 3-D initial geostress unloading model was established based on the measured geostress data and geological conditions. Combining the finite element numerical method and inversion theory, multiple regression analysis was established between the measured and corresponding calculated results of geostress. Then, the optimal regression coefficient could be derived. In addition, for convenience of comparison, another method was adopted by ignoring the action of river valley erosion. Through the comparison between the computed values by two methods and the measured geostress values respectively, it is found that the computed values by the former method are more close to the measured ones. Therefore, the distribution rule of initial geostress field can be obtained accurately, which provides important reference for design and construction of Ada dam and its diversion tunnel layout.
A Design for Spinning Die Channel of Melt-Blown Nonwoven Fabric
Authors: Yin Ming Fu , Li Xiao Qing , Gong Hui
Published: July 2011

This paper has designed the T-channel, the fish-tail channel and the coat-hanger channel, and compared them separately. The conclusion has been obtained, which the coat-hanger channel conforms to the production technological requirement of melt-blown nonwoven fabric. In order to further confirm the coat-hanger channel design, the pressure and speed distribution of flow process which polymer melt flow in the channel have been simulated by ANSYS. The results indicated that the coat-hanger die channel conformed to the design requirement perfectly.
The Influence of Stiffness on Automonile Brake Groan
Authors: Meng Xian Jie , Zhou Chang Cheng
Published: July 2011

A two degrees of freedom nonlinear dynamics model of self-excited vibration induced by dry-friction of brake disk and pads is built firstly, the numerical method is taken to study the impacts of stiffness on automobile brake groan. The calculation result shows that the variation of stiffness and has different influence on automobile brake groan. So the brake groan could be controlled through the adjustment of the relevant parameters according to the real vibration state of brake disk and pads.
Numerical Analysis of Ground Vibration Induced by High-Speed Train on Viaduct
Authors: Li Zheng Hui , Cao Yan Mei , Xia He
Published: July 2011

In order to study the ground vibrations induced by high-speed train passing on viaduct, two FEM sub-models, the train-bridge-pier model and the pile foundation-soil model, are established by means of the software of ANSYS. The effectiveness of the numerical models is tested and verified by comparing with other existed results. Moreover, the influences of different train speed and the damping ratio of soil on ground vibration are analyzed.
Study on the Rapid Design and Optimization Technology of Forklift Styling
Authors: Su Huan , Sun Shou Qian , Ren Hai Hua , Liu Xiao Jian
Published: July 2011

The paper introduced a computer-aided industrial design system: Forklift Truck’s Multi Plan Optimizaion System, and demonstrated the modules’ function and techniques with examples. Considering the requirements for efficiency and precision in the forklift styling, the author developed the forklift optimizing software for its styling, which includes parameter optimization, color optimization and part combination three modules. The parameter optimization module can vary the user defined parameters of the forklift models and generate new models. Color optimization module can group the model surfaces and render the groups with different color. New color plans are generated through random changing of the colors in each group. The parts combination module divides forklift into several parts and build lib for each part. The module can pick parts from the lib and assemble them into a whole forklift and demonstrate them. The thesis developed a proto system on the Solidworks platform with VBA programming tools. Interactive genetic algorithms are applied to realize the three module’s function.
Hybrid Particle Swarm Algorithm for Solving Multiprocessor Problem
Authors: Pan Feng Shan , Ye Chun Ming , Sheng Xiao Hua
Published: July 2011

Multiprocessor problem signifies that there are at least one process produced at more than two machines, which increases the difficulty and complexity of the problem. Hybrid particle swarm algorithm is adopted to solve the problem of multiprocessor in this paper.Through the redesigning parameters and programming, the final result is compared with that of genetic algorithm in conferences. The simulation results indicate that Hybrid particle swarm algorithm for solving multiple processors problem is better that of using genetic algorithms.
Study on Enterprise Network Based on B2B Website Platform
Authors: Liu Hui
Published: July 2011

A new type of enterprise network based on B2B website platform, which is expanding constantly, has appeared now. Such new enterprise network based on B2B website platform is different from traditional network in competition and cooperation among members, dynamics of enterprise network and scope of network. An enterprise joins a B2B website platform in order to complement each other’s advantages and create competitiveness. According to the basic features of B2B platforms, we selected 4 indexes including correlativity, centrality, scope and stability of network to analyze the effect of B2B enterprise network on enterprise performance.
Integrated Guidance, Control and Maneuver for Anti-Vessel Missiles Based on Backstepping Method
Authors: Li Cong Ying , Yu Jin Yong , Han Lei , Zhang Wen Guang
Published: July 2011

Integrated guidance, control and maneuver for anti-vessel missiles against vessel targets was studied. Firstly, the integrated guidance and autopilot model of the yaw plane was formulated, the guidance and control law was designed based on the backstepping method and sliding mode control theory. For the unavailable information of the vessel target, an estimating method was given. Integration of guidance and maneuver was realized based on a new guidance law. Finally, to verify the effectiveness and rightness of the integrated design scheme, the simulation of some anti-vessel missile against maneuvering targets had been made, the simulation results showed that high accuracy performance of guidance and control system can be got.
Study on Statistical Damage Softening Constitutive Model and Determination of Parameters for Rock Based on Lognormal Distribution
Authors: Wen Jian Hua , Zhou Cui Ying , Huang Li , Cheng Ye , Huang Lin Chong , You Fan Fan
Published: July 2011

Based on the property that micro-cells strength is consistent with lognormal distribution function, this paper presented a new statistical damage softening constitutive model simulating the full process of strain softening for rock. Through discussing the characteristics of random distributions for rock micro-cells strength, lognormal distribution assumption is tested by Kolmogorov-Smirnov test in statistics, and the reasonable method of geometry boundary condition is selected to determine model parameters that can be easily applied to the situations under different complex conditions. Gabbro experiment comparative analyses show that the new damage softening constitutive model is rational and convenient in engineering.
Structure Information of Barium Hexaferrite and Strategies for its Syntheses
Authors: Liu Yue , Li Yang , Liu Ying , Yin Hong Sheng , Wang Li Li , Sun Kun , Gao Yu
Published: July 2011

Structure information of barium hexaferrite is very important in designing higher efficient synthetic methods and in tailoring the magnetic properties of barium hexaferrite by doping. The structure information of M-type barium hexaferrite has helped to find new efficient routes of hydrothermal and co-precipitation methods in synthesizing barium hexaferrites and in altering their magnetic properties by doping.
New Approach in Cost Structuring of High Speed Hard Turning
Authors: Al Hazza Muataz H.F. , Adesta Erry Yulian Triblas
Published: July 2011

Cost structuring of new technology is a critical mission which needs to be developed systematically to get accurate cost estimation. In this research a new approach was proposed and developed for cost structuring a new process. Cost modeling roadmap was proposed to guide the development of genetic cost model by integrating different cost estimating methods and supporting the optimum solution by using statistical techniques in modeling the cost in high speed hard turning, then by building logical relationships between the different effective variables through three levels of cost drivers; main drivers, process and technical drivers and final drivers. Finally a matlab model was developed for simulating the final cost drivers to study the effect of different parameters on the cost drivers.
Surface Integrity of AISI H13 in End Milling and Electrical Discharge Machining Process
Authors: Ghani Jaharah A. , Goh Geok Yong , Che Haron Che Hassan
Published: July 2011

Industries are forced to seriously evaluate their design and manufacturing of their products due to the competition in the marketplace. Product characteristics such as tolerance specification, appearance, and service life now become a major concern for machined components. One of the most important aspects in machined components is surface integrity. It involves mainly the surface roughness and micro hardness changes during machining operation, which should be controlled and monitored to fulfill the product functions and customer needs. This paper presents the comparison effect of the end milling and EDM parameters on the surface integrity of AISI H13 tool steel (HRC50 3). The parameters studied were the cutting speed (224 m/min – 280 m/min), feed rate (0.25 mm/tooth) and depth of cut (0.3 mm-0.8 mm for end milling process. Whereas for EDM, the parameters studied were the peak current (1 and 4 A), pulse ON-time (6 and 12 μs), and pulse OFF-time (2 μs). The electrodes used were graphite and copper. In this study, the workpiece surface and recast layer were examined using an optical microscope. The observation revealed that both processes of end milling and EDM had cause the formation of three layers structure, i.e. white, martensite quenched and bulk material layers. The subsurface alteration for EDM process is considered rigorous as compared with the end milling process. Damages beneath the machined surface such as micro cracks and void were observed for EDM process, and microscopic pitting and surface roughning for end milling process. The measurement of the microhardness beneath the machined surface of AISI H13 was carried out using Vickers microhardness tester to characterize its mechanical properties. It was found that the highest hardness of 1010 Hv was in the white layer, and hardness of martensite quench layer was 423 Hv, which was lower than the bulk material layer of 430 Hv in EDM process. Whereas, a maximum of 550 Hv was measured directly underneath the generated surface, i.e. 30% more as compared to the hardness of the basic material in the end milling process.
Analysis of Diametrical Error of Machined Workpieces in Ultrasonic Vibration Assisted Turning
Authors: Soleimanimehr H. , Nategh Mohammad Javad , Amini Saeed
Published: July 2011

The elastic compliance of a work-piece under machining forces during machining operation and its subsequent spring back causes dimensional error. This phenomenon is more critical in turning process especially when long work-pieces are machined between chuck and center or between centers. Ultrasonic vibration assisted turning (UAT) where the cutting tool is put into an ultrasonicfrequency vibration during the ordinary cutting process leads to considerable improvement of the machined work-piece including increase in the dimensional accuracy. This is partly attributable to the noticeable decrease of the machining force in UAT compared with those occurring in conventional turning (CT). It is noteworthy that UAT is regarded as an advanced machining technique which is especially suitable for machining of brittle and hard-to-cut materials such as glass, ceramics and super alloys. In the present study, the diametrical error due to the spring back of work-piece being machined between chuck and center in turning operation is first analyzed. A model is then presented for prediction of this error in UAT by statistical analysis of extant experimental results. All influencing parameters are thus taken into consideration when deriving the predicting model. This model is verified by FEM simulation.
Performance of CBN and PCBN Tools on the Machining of Hard AISI 440C Martensitic Stainless Steel
Authors: Thamizhmanii S. , Ahmad Rosli , Hasan S.
Published: July 2011

In this study, flank wear on CBN and PCBN tools due to cutting forces were studied. Turning tests were carried using cutting speeds of 100, 125, 150, 175 and 200 m/min with feed rates of 0.10, 0.20 and 0.30 mm/rev and constant depth of cut. The performances of tools were evaluated based on the flank wear and cutting forces. There is clear relationship between flank wear and cutting forces while turning hard martensitic stainless steel by CBN and PCBN tools. Low cutting forces leads to low flank wear formation and low cutting forces provided good dimensional accuracy of the work material including low surface roughness. Flank wear formation was mostly caused by abrasion and adhesion. The built up edges formed reduced the cutting forces and also causes the heat generated at tool tip and work interface. High cutting forces are identified and this may be due to heat and flank wear combinations. Flank and crater wear on the rake face and hard metal deposition due to diffusion of metals on the cutting tool surface are the damages occurred during process.
Chip Serration Frequency - The Primary Cause of Chatter during End Milling Operation
Authors: Patwari Anayet Ullah , Nurul Amin A.K.M. , Faris Waleed Fekry , Azhari Marian , Farahain S.
Published: July 2011

Chatter is an unwanted but sometimes unavoidable phenomenon in machining. The term defines the self-excited violent relative dynamic motion between the cutting tool and work-piece. Chatter is undesirable due to its adverse effects on the product quality, operation cost, machining accuracy, tool life, machine-tool bearings, and machine-tool life. It is also responsible for reducing output. This paper includes the findings of an experimental study on instabilities of the chip formation process during end milling of Ti6Al4V alloy at different cutting conditions with two different two holders and its influencing factors on chatter formation. The instabilities of chip formation process are expressed as primary or secondary serrated frequency. The chip formed at different cutting conditions is analyzed and its frequency was calculated. It is observed that the primary serrated frequency is more prominent in end milling of Ti6Al4V alloy and its chip serration frequency has significant interaction effect with the with the prominent natural mode frequency of the system components. The vibration signals in frequency domain (FFT) have been analyzed to identify the chatter frequencies which have been compared with the chip serration frequencies in different cutting conditions for two different tool holders. It has been fairly concluded from the experimental findings that chatter is the outcome of resonance, in between the frequency of primary or secondary serrated frequency with the „prominent natural frequency‟ modes of the system components.
Prediction of Surface Roughness in High Speed Machining of Inconel 718
Authors: Suhaily Mokhtar , Nurul Amin A.K.M. , Patwari Anayet Ullah
Published: July 2011

Surface finish and dimensional accuracy is one of the most important requirements in machining process. Inconel 718 has been widely used in the aerospace industries. High speed machining (HSM) is capable of producing parts that require little or no grinding/lapping operations within the required machining tolerances. In this study small diameter tools are used to achieve high rpm to facilitate the application of low values of feed and depths of cut to investigate better surface finish in high speed machining of Inconel 718. This paper describes mathematically the effect of cutting parameters on Surface roughness in high speed end milling of Inconel 718. The mathematical model for the surface roughness has been developed in terms of cutting speed, feed rate, and axial depth of cut using design of experiments and the response surface methodology (RSM). Central composite design was employed in developing the surface roughness models in relation to primary cutting parameters. Machining were performed using CNC Vertical Machining Center (VMC) with a HES510 high speed machining attachment in which using a 4mm solid carbide fluted flat end mill tool. Wyko NT1100 optical profiler was used to measure the definite machined surface for obtaining the surface roughness data. The predicted results are in good agreement with the experimental one and hence the model can be efficiently used to predict the surface roughness value with in the specified cutting conditions limit.
Influence of Electrode Cooling on Material Migration among the Electrodes during EDM of Titanium Alloy
Authors: Abdulkareem Suleiman , Khan Ahsan Ali , Konneh Mohamed
Published: July 2011

Electrical discharge machining (EDM) is widely used in the machining of electrically conductive hard metals for the production of dies and moulds. This paper describes an investigation of the effect of electrode cooling on the amount of elements migration from the electrode to the workpiece surface and from the workpiece to the electrode surface. In the present study EDM has been performed with electrodes cooled by liquid nitrogen as well as with electrodes without cooling. Current, pulse-on time, pulse-off time and voltage were taken as the variables during conducting the experiments. The analysis on material migration during EDM was carried out by SEM and EDX. It was observed that EDM with liquid nitrogen reduces material migration and minimizes the surface contamination of both the electrodes.
A Study of Jet Characteristics of Plasma Arc under Transverse Alternating Magnetic Field
Authors: Meng Jian Bing , Xu Wen Ji , Sun Jing , Wang Xu Yue , Wang L.J.
Published: July 2011

A theoretical analysis was carried out to investigate the characteristics of plasma arc injected transverse to a transverse-alternating magnetic field. Two mathematical models were developed to describe both the oscillating amplitude of the plasma arc root and the heat flux density distribution of plasma arc on the workpiece surface. The characteristic of plasma arc under the external transverse-alternating magnetic field imposed perpendicular to the plasma current was discussed. The effect of processing parameters, such as working gas flux, arc current, magnetic flux density and the standoff from the nozzle to the workpiece, on the oscillation and heat flux distribution of plasma arc were also analyzed. The results show that it is feasible to adjust the shape and heat flux density of the plasma arc by the transverse alternating magnetic field, which expands the region of plasma arc thermal treatment and uniforms the heat flux density upon the workpiece. Furthermore, the oscillating amplitude of plasma arc decreases, and the heat flux density gradient upon the workpiece increases with decrease of the magnetic flux density. Under the same magnetic flux density, more gas flux and more arc current cause the oscillating amplitude to decrease. The researches have provided a deeper understanding of adjusting of plasma arc characteristics.
A Study on Thermal Fracture Processing Models Applied to Glass Substrate Cutting
Authors: Huang Kuo Cheng , Hung Min Wei , Tseng Shih Feng , Hwang Chi Hung
Published: July 2011

Thermal fracture-cutting technology (TFCT) for brittle materials has become the main technology for LCD glass substrate cutting to meet the low residual thermal stresses requirement. Based on the thermal weight function principle of fracture mechanics, this paper presents thermal weight function distributions for the mode-I and mode-II fracture model, and the fracture phenomenon under a variety of cutting paths, such as tilt crack, split crack, twist crack, and local buckling.