bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Multi-Sectoral Synergetic Mechanism for Emergent Decision-Making on Critical Incidents
Authors: Wang Xiao Guang , Xie Ya Li , Wang Yuan Fen , Zuo Zhong Hai
Published: July 2011

Emergency decision making is the core link and key content of crisis emergent management. The conventional decision-making principle cannot meet the needs of emergent decision-making. Therefore, general linear superposition principle is not applicable any more, and the synergetic principle must be followed in emergent decision-making on critical incidents. Basic principles of making emergent decision and approaches to multi-sectoral synergetic mechanism innovation relating to emergency decision making is presented in the article.
Research on Plasma Inducing-Graft Functionalized CNTs and their Epoxy Resin Composites
Authors: Jia Run Ping , Tao L. , Zheng K. S.
Published: July 2011

In this work, highly functionalized carbon nanotubes (CNTs) were achieved using plasma inducing-graft technique, in which maleic anhydride (MAH) was used as graft monomer. Then they were introduced into epoxy resin (EP) curing system to obtain CNTs/EP composites. The modification performance of this proposed method was summarized and contrasted with that of argon (Ar) plasma atmosphere. Results show that these two plasma methods can improve CNTs’ surface activity, and corresponding optimum powers are both 60 W. Meanwhile, thin polymaleic anhydride film can be coated on the surface of CNTs during MAH plasma inducing-graft, which can make sure of effectively dispersion and adhesion of CNTs in epoxy. Such treatment can not only obtain highly functionalized CNTs, but also overcome its serious self-entangling and aggregation problem. Compared with those composites modified by argon (Ar) plasma, the mechanical and thermal properties of CNTs/EP composites modified by MAH plasma are greatly enhanced.
Re-Entrant Production Scheduling Problem under Uncertainty Based on QPSO Algorithm
Authors: Pan Feng Shan , Ye Chun Ming , Zhou Ji Hua
Published: July 2011

Production scheduling problem is the one of the most basic, important and difficult theoretical research in a manufacturing system. In the past decades of research, the classical scheduling theory has made signficant progress, but the actual scheduling problems are much more complicated than the classical theory. In order to study, the actual scheduling problems are often made much simpler. Therefore, it is difficult for the results of the classical scheduling theory to been put into practice. The considerable gap also exists between the classical scheduling theory and the actual scheduling problem. But with the increasingly fierce market competition, customers have become increasingly demanding product diversification, product life cycle is shorter and more sophisticated structure of the product makes the actual scheduling a large number of uncertainties, the traditional model has become difficult to obtain satisfactory results. This paper makes a analysis on the uncertainties of production scheduling,and tries to solve re-entrant production scheduling problem based on QPSO. It introduces the mathematical model and the solving process based on QPSO algorithm. Then it makes construction strategies to solve it. The paper simulates with Visual C. The results show that this algorithm is feasibility.
Development of a Measuring-Controlling Platform for MR Absorber with Embedded Controller
Authors: Hu Hong Sheng , Wang Juan
Published: July 2011

In order to improve its comprehensive properties and speed up its development period, a measuring-controlling platform was designed and tested for MR damper based on virtual instrument in this paper. Parameters and its comprehensive properties of the manufactured MR damper with embedded controller are firstly introduced and show. Then, its design principle of a measuring-controlling unit for MR damper with embedded controller is analyzed. Finally, a virtual integral developing platform based on virtual instrument and Labview environment is designed and developed. And a lot of properties test are finished for the designed and manufactured MR damper. Testing results show that the developed integral platform could meet its engineering application requirements of MR damper with embedded controller.
The Corn Seed Image Segmentation and Measurement of the Geometrical Features Based on Image Analysis
Authors: Zhao Min , Wu Wen Fu , Zhang Ya Qiu
Published: July 2011

In this article, separation of touching grain kernels and measurement of geometric features in an image are presented. The objective of this work is to discriminate single corn kernel and some broken kernels, which are difficult to achieve on the existing machinery and equipment, especially for the counted number and quality inspection process. The digital image was obtained from flatted conveyor belt; the geometrical features were analyzed using Matlab R2009a software. It was used for recognizing multiple kernels for once. Intact and broken kernels were characterized by the changed geometrical features and combining SVM for the classification of them with accuracy 95%.Which meet the requirement of corn quality inspection comparable to subjective human inspection.
Modified Projective Synchronization of Uncertain Unified Chaotic Systems via Backstepping Approach
Authors: Luo R. Z. , Wang Y. L. , Deng S. C.
Published: July 2011

This paper focuses on modified projective synchronization of uncertain unified chaotic systems via backstepping approach. A parameter observer is designed to identify the unknown parameter of unified chaotic systems and a novel backstepping control method is presented for synchronizing two identical unified chaotic systems with each other. Numerical simulations are shown to verify the feasibility and effectiveness of the proposed control technique.
Effects of Macroscopic Pores on the Damping Behaviors of Metal Materials
Authors: Wei Jian Ning , Li Gen Mei , Zhou Li Ling , Zhou Xue Yun , Yu Jian Min , Huang Tian Cheng
Published: July 2011

A large number of macroscopic pores were introduced into commercially pure aluminum (Al) and Zn-Al eutectoid alloy by air pressure infiltration process to comparatively study the influence of macroscopic pores on the damping behaviors of the materials. Macroscopic pores size are on the order of a millimetre (0.5~1.4mm) and in large proportions, typically high 76vol.%. The damping behavior of the materials is characterized by internal friction (IF). The IF was measured on a multifunction internal friction apparatus (MFIFA) at frequencies of 0.5, 1.0 and 3.0 Hz over the temperature range of 25 to 400 °C, while continuously changing temperature. The damping capacity of the metal materials is shown to increase with introducing macroscopic pores. Finally, the operative damping mechanisms in the metal materials with macroscopic pores were discussed in light of IF measurements.
Influence of Mechanical Vibration Moulding Process on the Tensile Properties of TiC Reinforced LM6 Alloy Composite Castings
Authors: Sayuti Mohd , Sulaiman Shamsuddin , Baharudin B.T. Hang Tuah , Arifin M.K.A.M. , Vijayaram T.R. , Suraya S.
Published: July 2011

Vibrational moulding process has a remarkable effect on the properties of castings during solidification processing of metals, alloys, and composites. This research paper discusses on the investigation of mechanical vibration mould effects on the tensile properties of titanium carbide particulate reinforced LM6 aluminium alloy composites processed with the frequencies of 10.2 Hz, 12 Hz and 14 Hz. In this experimental work, titanium carbide particulate reinforced LM6 composites were fabricated by carbon dioxide sand moulding process. The quantities of titanium carbide particulate added as reinforcement in the LM6 alloy matrix were varied from 0.2% to 2% by weight fraction. Samples taken from the castings and tensile tests were conducted to determine the tensile strength and modulus of elasticity. The results showed that tensile strength of the composites increased with an increase in the frequency of vibration and increasing titanium carbide particulate reinforcement in the LM6 alloy matrix.
The Lifting Efficiency of Coarse Particles in Vertical Pipes
Authors: Pan Hua Chen , Tian Xiao Qing , Wu Lei
Published: July 2011

A numerical method has been developed to analyze the solid-liquid two-phase flow with coarse particles in vertical pipes. Based on the numerical study, a concept of lifting efficiency has been suggested to describe the efficiency of lifting solid particles by the moving liquid. The lifting efficiency can be defined as, where vs is the average velocity of the solid particles and vl is the average speed of the liquid. It was found that when the liquid speed is lower than 3m/s, the lifting efficiency is increased when the liquid speed is increased. On the other hand if the liquid speed is more than 3m/s, the lifting efficiency will decrease if the liquid speed increases. It was also found that the speed of the particles will decrease if pipe vibration frequency is increased. However the lifting efficiency remains unchanged compared with the stationary pipes.
The 3S Education in Carbon Cycle by WEBGIS
Authors: Zhang Yuan Zhu , Kuang Hong Hai
Published: July 2011

The 3S education in carbon cycle by Webgis has been studied in the paper. Ways of 3S education in carbon cycle are introduced in the paper. By analysing these ways of 3S education, a new way by the help of Webgis is chosen. Two classes are chosen to test the way. The result of the test tells us that Webgis can help students in 3S education in carbon cycle.
Finite Element Analysis of the Thermal Field of Piston in an External Combustion Cam Engine
Authors: Gao Sheng Yao , Wang De Shi , Zhou Qi Zheng
Published: July 2011

As the most dominative component under stress in an external combustion cam engine, the working condition of piston is very rigor. Once new design type and technical improvement is applied, it is necessary to analysis its thermal load and take secure steps. And the finite element model on each conditions of thermal is calculated, which is used to estimate the temperature field and provide a theoretical basis for further structural strength analysis and optimization design. Choosing analysis results of the piston as reference and taking five structural parameters of the piston as design variables, two objective functions including piston mass and maximal Von Mises stress are respectively considered. The optimum design of the piston is executed and the results indicate that it is feasible to improve temperature field and strength of the piston. These results enrich and develop the research on structural analysis and optimization of spatial engine, which are of guiding significance for analyzing engine strength and related problem in theoretically.
Simulation of Non-Linear of Vertical Impact Damping System
Authors: Zhang Jian Sheng
Published: July 2011

The simulation research of vertical impact damping system was made in the paper, taking the experimental parameters of [1] as input of simulation program, and the comparison between the result of simulation and that of experiment was drawn, which brought some conclusions in the aspect of non-linear of system.
Researching Progress of Zeolite Modification and their Applications in Wastewater Treatment
Authors: Yu Li Jing , Feng You Li
Published: July 2011

Zeolite as a cheap mineral material in industry used in catalytic and environment protection, long time has passed for research on zeolite modification, synthesis and application. In the paper, several modifications for zeolite have been reviewed in detail such as the skeleton element modification, skeleton element modification and zeolite crystals surface modification, modified zeolite properties and application. The shortcomings of the modification methods were pointed out, development and zeolite modification suggestions in the future were put forward.
Three-Dimensional Consolidation of Visco-Elastic Soil around a Driven Pile
Authors: Chen Zhang Long , Tang Liang Liang , Niu Si Bin , Yu Chuang
Published: July 2011

Driven piles commonly generate excess pore water pressures in the surrounding soil. The reconsolidation of the clay around the piles is investigated, assuming that the Mechant model can be used to describe the visco-elastic features of the soil. The initial excess pore distribution away from the pile varies according to the cylindrical cavity expansion theory. The governing equation is derived under the continuity condition. The three-dimensional analytic solution of dissipation of the excess pore water pressures induced by pile driving is solved by the methods of separation of variables and using the Laplace transform and inverse transform. Then, a case is analyzed making use of the solutions. The results show the dissipation speed of excess pore water pressures around the pile is faster than that far away from the pile and the vertical dissipation rate increases along the depth.
Instability Analysis and Rate-Dependent Failure Criteria for Adiabatic Shear Band Propagation of Ti-6Al-4V
Authors: Ma Li , Xin Jian , Wang Li Ke , Xu Ping
Published: July 2011

Adiabatic shearing is a typical response of materials under high strain rate loading. Based on the instability analysis for the thermo-viscoplastic constitutive model, a new rate-dependent failure criterion is proposed, where the failure strain decreases with the increment in strain rate. Using the finite element simulation of the Mode-II impact problem for the titanium alloy Ti-6Al-4V, we verified the damage mechanism induced by adiabatic shear band (ASB) under this rate-dependent failure criterion. Also the ASB propagation path and the width of localized shear band are predicted, which is in a good agreement with experimental observation.
Reckoning for Element Characteristics Matrix of Space Timoshenko-Beam Based on Energy Variational Principle
Authors: Pan Wen Jun , Wei Zhi Wu
Published: July 2011

To analyze and calculate the element characteristics matrices of space Timoshenko-beam, research work were carried out on the basis of energy variational principle. Displacement function for the space Timoshenko-beam were put forward, the expressions for element mass matrix, stiffness matrix and load array were deduced by energy functional extremum, and the explicit forms of element mass and stiffness matrices were integrated finally. Results show that the element mass and stiffness matrices computed by this method are consistent with those in related references. It has a good theoretical and practical value in the calculation for characteristics matrices of other elements.
Study on Preparation and Catalytic Properties of Pd/γ-Al2O3 Catalysts in One-Step Synthesis of Dimethyl Ether
Authors: Chu Rui Zhi , Zhang Zhong Cai , Liu Ya Fei , Meng Xian Liang , Zong Zhi Min , Wei Xian Yong
Published: July 2011

A series of Pd/γ-Al2O3 catalysts with different additons of Pd were prepared by impregnation. The effect of calcination condition and Pd loading on catalytic performance of catalysts for one-step dimethyl ether synthesis has been investigated. The physic-chemical performance and structure of Pd/γ-Al2O3 catalysts were characterized by CO-TPD, TGA and nitrogen physisorption. The results show that the dispersion of Pd and the amount of adsorbration on the CO-bridge of Pd could be increased to by the moderate microwave heating on the catalysts, and the catalyst performance can be improved. But a large number of surface acidic sites of Pd/γ-Al2O3 are covered by highly fragmented Pd-grain, it causes DME selectivity reduced. And the excessive Pd can reduce the samples’ surface acid, decrease the dispersion of the metal Pd and block up the pore of γ-Al2O3. The CO conversion rate and DME space-time yield could reach 60.1% and 28.76 mmol·g-1·h-1 respectively at 2% Pd loading, at this time Pd/γ-Al2O3 has a high Pd activity surface and ideal acid sites.
Simulation of Control System for Permanent Magnet Synchronous Machine
Authors: You Ting , Li Pei Jiang
Published: July 2011

For optimal control of synchronous machine, chattering phenomenon will appear if traditional slider control is adopted because permanent magnet synchronous machine is a complex nonlinear time-dependent system with strong coupling of current and rotational speed to cause the deterioration of system control performance with load or load disturbance. In this article, based on the mathematical model of permanent magnet synchronous machine, a control system for it, which combines sliding mode control and active disturbance rejection control, is proposed to improve the dynamic performance and robustness of control system. In the control system, sliding mode control is adopted to control the inner current of machine and active disturbance rejection control is adopted to control the outer speed. The load disturbance of system is also estimated and offset. The results of matlab simulation show that the control system can eliminate serious chattering phenomenon existing in sliding mode control, improves the robustness of system for load and system parameter disturbance as well as has great dynamic and static performance.
A Study on the Decision-Making Thinking of the Management of University E-Library in Taiwan
Authors: Chin Jiung Bin
Published: July 2011

As of end of December 2010, Taiwan reports over 160 colleges and universities and is proclaimed as a country that reports highest college density. Therefore, a heavy impact and acute competition between colleges and universities has made the schools spare no effort to enhance quantity & quality of teaching and research related resources to stay competitive. However, a large improvement is required to the existing university e-libraries in terms of manpower allocation, budget amount, software & hardware facilities, quantity & quality of library collection and management philosophy deficiencies. Therefore, the management of various libraries needs to reinforce librarians’ capabilities in management and decision making to enhance overall library performance. The paper mainly follows various decision-making thinking, decision-making philosophy, decision-making mindset, decision-making methods and decision-making discipline ideas of Habitual Domains, with over 10 years personal experience of being a curator of university library considered to come up with strategies that are beneficial to the decision making thinking of university curators in Taiwan, so as to achieve the performance of library affairs and to expect to enable a new opportunity for the future development of university e-libraries in Taiwan.
Adaptive Lateral Control of Reconnaissance and Strike Integrated UAV
Authors: Xiao Wei , Zhu Xiao Ping , Zhou Zhou
Published: July 2011

This paper presents a lateral Integrated Fire/Flight Control (IFFC) for a Reconnaissance and Strike integrated Unmanned Aerial Vehicle (R/S UAV). The system consists of a fire/flight coupler and an adaptive rolling angle controller. In order to improve the changeful dynamic in the rolling loop of the R/S UAV, a Neural Network (NN) is used to obtains approximate inverse dynamics of the response. Numerical simulation is performed using this method, and the results show that the proposed system improves the IFFC performance including the time delay and overshoot.
An Experiment of Fatigue Crack Growth under Different R-Ratio for 2024-T4 Aluminum Alloy
Authors: Yang Guang , Gao Zeng Liang , Xu Feng , Wang Xiao Gui
Published: July 2011

The fatigue crack growth tests of compact tension (CT) specimens of 2024-T4 aluminum alloy were conducted under constant amplitude loading with differentR-ratios, 0.05, 0.1, 0.5, 0.75, respectively. The thickness of the specimen is 3.8mm. All the fatigue crack growth experiments were carried out in ambient air without a pre-crack. The early crack growth region reflects the influence of the notch. An optical reading micrometer with a magnification of 40 was used to measure the crack length. The size of the notch together with the loading conditions has a great influence on the early crack growth within the notch influenced region. Beyond the notch influenced zone, the stable fatigue crack growth is reached and can be characterized by the Paris law. The experimental results indicate that fatigue crack growth rate increases with theR-ratio for a given stress intensity factor amplitude.
Study on the Anti-Mite Property of Home Textiles
Authors: Zhang Hong Xia , Tao Rong , Tian Wei , Lu Yan , Zhu Cheng Yan , Xie Jian Qiang
Published: July 2011

In order to study the influence of anti-mite and antibacterial fibers content on the anti-mite property of fabrics, yarns of antibacterial moisture absorption & perspiration elimination fibers, photocatalytic moisture absorption & perspiration elimination fibers and their blended yarns with hemp fiber, bamboo fiber, Tencel, cotton fiber were selected, and six sets of samples were manufactured. The anti-mite properties of these six fabrics were tested with the repellent method and analyzed, the relationship between the content of these two anti-mite and antibacterial fibers and the anti-mite property of fabrics was obtained. The experimental results indicated that with the content of anti-mite and antibacterial fibers increasing, the anti-mite property of fabrics improved gradually. When the content of antibacterial moisture absorption & perspiration elimination fiber was 100%, the repellent rate of the fabric for dust mite was 80.51%; when the ratio of photocatalytic moisture absorption & perspiration elimination fiber and bamboo fiber in fabric was 65/35, the repellent rate of the fabric for dust mite reached to 82.05%, the two kinds of fabrics both owned better anti-mite performance. The conclusions from this research can be used as a reference to design and develop fabrics for home textiles with better anti-mite effect and comfortability.
Study on the Out-Plane Size Effects of Honeycomb Sandwich Panels
Authors: Sun Shi Ping , Lai Yu Dong
Published: July 2011

A computational model, which can reveal the out-plane size variation of sandwich panel unit cell, is proposed to study the out-plane size effects of honeycomb sandwich panels. In this model, the three dimensional unit cell of sandwich panel, consisting of the upper and the lower skins and the homogenized core, is constructed based on homogenization method. Three methods, i.e., homogenization method, the finite element method and the classical laminated plate theory, are used to study the influences of the out-plane size variation on the bending effect and vibration response of sandwich panel. Numerical results show that the solution of finite element method agrees with that of laminated plate theory when the number of out-plane unit cell is small. However, once the number of out-of-plane unit cell is large enough, the finite element solution is close to the homogenization results.
The Lower Muscles Force Features of Elite Short Track Athletes and Regression Analysis of their 500m Results
Authors: Wang Xin
Published: July 2011

In order to point out the relationship between the lower muscles force and 500m result f6r short track speed skating, the knee and ankle muscle strength of elite male skating athletes is measured and analyzed by IsoMed 2000 isokinetic testing system. Based on the features of athletes’ muscle strength, the study tends to find out the differences and drawbacks in short track speed skating athletes and to make further discussion on the laws and determinations of the event. The main conclusions are as follows: 500m result of elite male short track skating athletes are determined by that the muscle performances of fast speed, which including force opportunity, power ability and max-strength ability; the knee muscles are more important than that of the ankle’s; the strength with technique is the core factor for result.
Structure and Properties of Anodized Films Formed on AZ91D Magnesium Alloy
Authors: Li Jian San , Liu Jun Quan
Published: July 2011

Anodized films on AZ91D magnesium alloy were prepared in sodium hydroxide based solution. Structure and properties of the anodized films were investigated by X-ray diffraction (XRD), scanning electron microscope (SEM) and electrochemical potentiodynamic polarization analysis. The results of XRD showed that the films were mainly composed of Mg(OH)2and Al(OH)3. As the solution temperature increasing, the anodized films became thicker and denser, which could cover up the substrate. The films also became thicker and denser with the increase of anodizing time. The grain in the films grew fast when anodic current density increasing and a larger grain size would be found at a higher anodic current density. The results of microscopic analysis exhibited the porous-type anodic oxide, which was similar to the films on aluminum alloy. The results of electrochemical potentiodynamic polarization analysis showed that thermodynamic stability of the alloy had a certain improvement after anodization. The anodized films also exhibited an obvious increase of polarization resistanceRPand an obvious decrease of corrosion current densityic. Discoloration time of drop test on the films lasted for 30 min, which indicated that corrosion resistance of the magnesium alloy was greatly improved by anodization.
State of the Art of Graded Self-Lubricating Ceramic Cutting Tool Materials
Authors: Wu Guang Yong , Xu Chong Hai , Zhang Yong Lian , Yi Ming Dong
Published: July 2011

In this paper, the effects of addition of solid lubricants on mechanical properties, tribological properties and cutting performance of ceramic cutting tool materials were analyzed. The problem that existing homogeneous self-lubricating ceramic cutting tool materials were not available to possess rational combination of antifriction and antiwear properties was pointed out. The main methods to acquire graded self-lubricating materials were discussed. The design concept and research prospect of graded self-lubricating ceramic cutting tool materials were proposed, which would have promising applications in the field of high speed cutting.
Effect of Mg2Si Contents on Microstructure of Mg2Si Particle Reinforced Hypereutectic Al-Si Alloy Composites
Authors: Liu Zheng , Liu Xiao Mei , Xie Min
Published: July 2011

Mg2Si particle reinforced hypereutectic Al-Si composite was prepared by direct melt reaction, and the effects of Mg2Si content on the microstructure of the composite were researched. The results indicated that the morphology of Mg2Si obviously changed with Mg2Si contents increasing, in which the morphology of Mg2Si in the composite had changed from polygon block to characters like and finally became coarse dendrite. Formation of α-Al grains in the composites with the high Si and Mg content was discussed.
Numerical Simulation of the Auto Claw-Pole Thixoforming Process
Authors: Dao Van Luu , Zhao Sheng Dun , Lin Wen Jie
Published: July 2011

Thixoforming is an effective near-net-shape forming process to produce components with complex geometry and in fewer forming steps. In this study, thixoforming was used to replace the conventional hot forging to form the auto claw-pole. The finite element code Forge2008Ó was used to simulate the auto claw-pole thixoforming process. The results show that initial billet temperature, punch speed, die temperature and friction have strong impact on the forming process. Finally, the reasonable process parameters for the auto claw-pole thixoforming were obtained: initial billet temperature 1430~1440°C, punch speed 100~200mm/s and die temperature 300~400°C.
Back Analysis of 3-D Initial Geostress of Laohutai Coal Mine by the Method of Multiple Regression and FLAC3D
Authors: Zhou Jian Jun , Zheng Tian Ya , Fu Zhan Ling , Chen Lei
Published: July 2011

Initial geostress is one of the most important factors in coal mining. By combination the finite difference software FLAC3D with multivariate linear regression theory, 3-D initial geostress in situ is back analyzed, which also considers the effect of gravimetrical and tectonic stress. The back analysis results of initial geostress in Laohutai coal mine are in a good agreement with the in-situ test results, which provides theoretical support on prediction of geostress and also more convenient geostress data in coal mining.
Study on the Mechanism of the Strippable Sintering Layer of the Natural Yellow Clay-Bonded Sand for Iron Casting
Authors: Luo Yi Lan , Zhu Shi Gen , Yang Zheng Gang , Zhang Rui
Published: July 2011

The distinguished characteristic of casting process of natural yellow clay-bonded green sand is a strippable sintering layer formed at the interface of casting and mould. Hot shake-out can be realized because this sintering layer can firmly attach to the casting surfaces to protect castings at elevated temperature. Better surface quality of castings is achieved after the sintering layer easily shed from the casting surface at room temperature. In this study, a series of tests were carried out to reveal the characteristic of this sintering layer. First, thermal gravimetric/differential thermal analysis (TG/DTA) method was used for detailed analysis the thermal property of natural yellow clay-bonded green sand. And, X-ray diffraction (XRD) analysis was employed to define the phase composition at variable temperatures. Then, sintering experiments were carried out on mixtures of natural yellow clay-bonded sand with iron powder or iron oxides under different conditions. Finally, the mechanical performances of sinter layer of natural yellow clay-bonded sand at elevated and room temperatures were investigated. The result revealed that natural yellow clay-bonded green sand is a kind of low grade molding sand, and iron oxides participate in the forming of sintering layer. The sintering layer of natural yellow clay-bonded sand were proved both excellent plastic at elevated temperature and brittle at room temperature, which coincides with its behavior in the casting process.
Study of Temperature Evolution and Metal Flow of 6005A Aluminum Alloy during Indirect Extrusion
Authors: Qiao Ji Sen , Li Fi , Xia Tian Dong
Published: July 2011

A numerical model has been build up to study temperature evolution and metal flow for the indirect extrusion of 6005A aluminium alloy. Model validation was carried out by comparison between experiments and simulations. Results show a good agreement with each other. The influence of the extrusion parameters on the profile temperature and metal flow were studied according to the real industrialized process. It was found that the profile temperature increases with the ram speed as well as the peak load of the total press force. However, a too slow extrusion process would cause increasing of the total force at the end of the extrusion because of heat dissipation to the environment. In addition the dead metal zone at the top of the billet was shrunk during the extrusion process. The ram speed would have little influence on the distribution and shape changing of dead metal zone. Once the extrusion went into steady stage, the strain rate of metal flow would keep a stable situation relatively.
The Experimental Modal Analysis of Water-Lubricated Rubber Stern Bearing
Authors: Jin Yong , Zheng Lin Liu
Published: July 2011

With the widespread use of the water lubricated rubber stern bearing, researches around rubber bearings are becoming hot points in recent years and researches on dynamic characteristic are particularly important. The dynamic characteristics of vibration system depend mainly on its modality parameters. This paper presented experimental modal analysis of water-lubricated rubber stern bearing by hammering method, and by comparing the differences with the finite element simulating result, analyzed the rubber bearing based on linear modal analysis theory. Due to the nonlinearity of rubber material, although the natural frequency range of rubber layer could be gotten, it’s hard to get the precise modal shapes of it, yet the metal layer could get more precise results.
Development of Stock Trading Optimization Analysis System Using Moving Average Method
Authors: Ling Pang Wen
Published: July 2011

The Taiwan stock market has millions of investors. If each investor spends $5,000 NTD each month on a professional technical analysis system (the current use price is $5,000~10,000 NTD) and it is conservatively estimated 100,000 investors would use the system, the market potential will be $500 million NTD. Developing an effective stock trading analysis system can help investors obtain profits. At the same time, the system buyers can also make considerable profits. The study is intended to develop a stock trading technical analysis system with moving average method.
Mesoscopic Models of Two-Phase Transport in PEMFCs: A Review
Authors: Wu Wei , Jiang Fang Ming , Dong Zhi Qiang
Published: July 2011

Water management is one of the most critical and widely studied topics in what concerns proton exchange membrane fuel cell (PEMFC). Traditional macroscopic models of two-phase transport in PEMFCs generally assume “homogeneous” medium and are based on the concept of volumetric averaging, thus lumping all the detailed information of the structural morphology inside a PEMFC. Mesoscopic models have the potential to reveal the underlying pore-scale mechanism of two-phase transport in PEMFCs. This paper aims to review the sate-of-the-art and perspective of the PEMFC mesoscopic two-phase transport models, mainly the pore network (PN) model and the Lattice Boltzmann (LB) model. We will talk about what we are planning to do using the LB model as well.
Inventory Control and Simulation Optimization in Supply Chain Network Based on MPC
Authors: Liu Chun Ling , Li Ji Zi , Wu You
Published: July 2011

The control approach applies multivariable model-predictive control principles to the entire network. The optimization scheme based on predictive-control aims at adjusting the decision variables in the supply chain to satisfy the customer orders with the least operating cost over a specified rolling time horizon using a detailed difference model of the system. Dedicated feedback controllers are utilized to maintain product inventory at all nodes of the supply chain network within pre-specified target levels that are subsequently embedded within the optimization control framework. The PID control policy is applied to promoting the predictive control effect, and the comparative simulations of the system under both PID and non-PID control are exerted. Simulated results prove that the inventory control system with the proposed MPC optimizations show good dynamic performance. But the MPC approach combined with PID control makes better effect on inventory predicted control in the supply chain network.
The Evaluation Method of Enterprise Financial Management Skill
Authors: Tu Jian Ping
Published: July 2011

By means of selecting evaluation procedure and evaluation methods of financial management expertise, regulators of the financial management system can know the existing problems feedback and reverse the amendment evaluation parameters, revise the problems in the evaluation program, thereby improving the reliability and validity of the evaluation system . Exploration to financial management expertise can promote the formulation of other professional skill system; building of financial management system can strengthen students' practical application of basic knowledge and realize the combination between skills and; the Practice of financial management system can improve the integration between vocational education and vocational skills; the development of financial management system can improve students' abilities in respects of professional extension, actual work capacity, practical innovation, collaboration, management, employment and entrepreneurship.
A Flow-Dependent Secondary-Shortest Path Algorithm for Naval Ship Evacuation
Authors: Liu Chong , Qiu Chang Hua
Published: July 2011

In this paper, we introduce a secondary evacuation planning problem which is solved by computing flow-dependent shortest path through a known shortest time escape route on a ship. Given a primary escape route, our secondary evacuation planning problem consists in finding the second-shortest escape route, based on the cabin network rebuilding. We suggest a new model for flow-dependent network where the travel time of each link depends on the flow speed and the flow speed depends on the total number of evacuees traversing the link. The model focused on the average evacuation time to travel through the ordered sequence of consecutive arcs by each group, and we proposed a heuristic algorithm to produce sub-optimal secondary evacuation plan. A numerical example is given at last. Results showing that our algorithm can effective supply the flow-dependent network k-shortest path need in reasonable computation times.
Temperature Field Numerical Simulation on the Exhaust Silencer with Adiabatic Envelope
Authors: Yu Yun Liang , Wang Zhong Yi , Chu Shu Guang , Han Jia
Published: July 2011

Exhaust noise is the major noise source of the internal combustion engines, and the exhaust silencer is the device to reduce the exhaust noise. Exhaust gas of the internal combustion engine is high-temperature, therefore in the study of internal combustion engine exhaust silencer, the surface temperature’s influence on the surrounding adjacent facilities should be controlled to a certain range and the status of the temperature field depends on the material and structure of the adiabatic envelope. The model of exhaust silencers discussed in this article is fluid-solid interaction model and this paper uses the CFD software for numerical simulation of the model. Using appropriate boundary conditions, calculation models and silencer model with heat transfer surface, this paper uses N-S equation and standard turbulent model to simulate the flow field and wall temperature field inside the silencer, and does post-processing analysis of the results.
Influences of the Height of Two Wall-Mounted Rectangle Cylinders on their Flow Patterns and Drag Coefficients
Authors: Li Hai Yuan , Xue Da Wen , Chen Zhi Hua , Li Bao Ming
Published: July 2011

Large eddy simulation has been applied to simulate the compressible flow past one and two wall-mounted rectangle cylinders, respectively. The dynamic subgrid stress model is employed to approximate the subgrid scale effects. Flow past one single wall-mounted cylinder is used as an example to validate our code. Flow past two wall-mounted cylinders is chosen for investigating the variation of flow fields and drag coefficients under different heights of two cylinders. Our numerical results show that, with certain ratio of two cylinder height, their drag coefficient can be improved, which is important for practical building industries.
State- Owned Forest Tenure Reform Efficiency Evaluation of Heilongjiang Province
Authors: Zhong Wei Wei , Cao Yu Kun
Published: July 2011

This dissertation adopts Data Envelopment Analysis method, in accordance with principles of comprehensiveness, concise, relevance and relativity as well as decision package requirements on quality and quantity, it selects four input indexes as woodland area, stuff, technical stuff proportion and fund; two output indexes as live stumpage and output value of state-owned forest farm, and takes use of DEAP2.1 software based on input-oriented BCC model to make an efficiency evaluation of 11 state-owned forest farms which participate in forest tenure reform and 19 which does not. The result shows no matter it's technical efficiency, scale efficiency or pure technical efficiency, forest farms which carries out reform are more efficient that those which does not.
The Micro Fluidic Integrated Circuits Design Method based on the CAD System
Authors: Zhao San Ping
Published: July 2011

In this study, SPICE program is applied to design micro fluidic circuits based on the analogical relationship with MOSFET models for the first time. A SPICE model of pneumatic-FET is established to express the behavior of them in micro fluidic circuits. Construction of pneumatic-FET model, its optimization, and effectiveness in circuit design and comparison are discussed in the later sections.
A Discussion on the Incorporation of National Defense Education Factors into College Physical Education
Authors: Ren Li Ying , Shi Jin Liang
Published: July 2011

Based on the author’s research, this article suggests that incorporating national defense factors into the teaching of college P.E. courses is beneficial to raise college students’ awareness of the importance of national defense, can help lay a solid foundation for the building of national defense reserve force and refine and standardize college students’ social behavior as well. It also advances utilizing drills of parade and procession march in order to reinforce and reap the good results from military trainings, improve and enrich the trainings through physical exercises, sports games and extracurricular competitions in which the concept of national defense education should be included and emphasized. In the process of cultural development regarding P.E. systems, a few pieces of advice are offered here to introduce and integrate elements of national defense education.
Fault Classification Model of Rotor Based on Support Vector Machine
Authors: Niu Wei , Wang Guo Qing , Zhai Zheng Jun , Cheng Juan
Published: July 2011

The vibration signals of rotating machinery in operation consist of plenty of information about its running condition, and extraction and identification of fault signals in the process of speed change are necessary for the fault diagnosis of rotating machinery. This paper improves DDAG classification method and proposes a new fault diagnosis model based on support vector machine to solve the problem of restricting the rotating machinery fault intelligent diagnosis due to the lack of fault data samples. The testing results demonstrate that the model has good classification precision and can correctly diagnose faults.
Experimental Study and Detached Eddy Simulation of the Macro-Instability in an Eccentric Stirred Tank
Authors: Yang Feng Ling , Zhou Shen Jie , Wang Gui Chao
Published: July 2011

The turbulent flow in stirred tank is highly complicated and anisotropic, especially when the macro-instability (MI) are involved. In this work, the numerical simulation method of the eccentric agitation was established based on the detached eddy simulation (DES) model to study the MI in an eccentric stirred tank. The turbulent flow in the eccentrically located Rushton turbine stirred tank was numerically investigated. The rotation of the impeller was simulated by the transient sliding mesh (SM) method. The effect of eccentricity, impeller Reynolds number and impeller-tank diameter ratio were studied in order to quantify the MI frequency. PIV experiments were performed to validate the DES results and frequency analyses were applied to the obtained time series of the velocity recordings. It was found that the flow field in eccentrically stirred tank are highly unsteady and is subject to MI with varying period less than 10 blade passage period. Good agreements have been found between the DES and PIV results, both indicate that the dominant frequency of MI increases linearly with the Reynolds number, increases with the impeller-tank diameter ratio and decreases with the eccentricity. According to the agreements between the experimental and simulation results, it can be concluded that the combination of DES and SM is suitable for the prediction of the MI phenomenon in stirred tanks.
An Circuit Fault Diagnosis Method with K-Means Kernel Density Estimation
Authors: Tang Jing , Shi Xian Jun , Zhang Wen Guang
Published: July 2011

A K-Means kernel density estimation was proposed and it was used in the pretreatment process of circuit fault diagnosis. The unequal division and losing division problem caused by the traditional method are solved by this method. It also avoid the singular problem which is usually caused by the high dimension of characteristic data. A kernel function is designed and it was integrated with fuzzy support vector machine method to solve the classification problem of multi-faults . At last, a solution of optimal bandwidth is given to improve the proposed method.
Dynamic Behavior of a Rigid, Perfectly Plastic Free-Free Beam Subjected to a Local Uniformly Distributed Impulsive Load at one End
Authors: Hao Chen Peng , Wu Cheng
Published: July 2011

The small-deflection response of a free–free beam subjected to a local uniformly distributed impulsive load at one free end is examined; the material of the beam is assumed to be rigid and perfectly plastic. Solutions are obtained for various combinations of the magnitude and length of the local uniformly distributed impulsive load. The location of the plastic hinge on the beam depends not only on the magnitude of the load but also on the length of the load applied. As the length of the applied uniformly local distributed load is fixed, the plastic hinge would occur in the region between the limit position of plastic hinge εlim and the critical position of plastic hinge εc which are determined by the length of the applied load.
Effects of Alloy Compositions on Amorphization and Crystallization of Al-Ni-Ce-C Powders by Mechanical Alloying
Authors: Chen Jun Hua , Zhang Song , Qu Ying Jie
Published: July 2011

In the present work, Al-Ni-Ce-C amorphous powders with different compositions have been prepared by a high energy ball milling technique. The amorphization behaviors of the Al-Ni-Ce-C powders have been studied using X-ray diffraction and transmission electron microscopy. The results show that alloy compositions have a great influence on the amorphization behavior of the Al-Ni-Ce-C powders and the optimum composition is Al85Ni10Ce5+1 wt.% C for the formation of amorphous phase. The thermal stability of the as-milled powders has been investigated by differential scanning calorimetry. It has been found that the compositional effects on thermal stability are similar to those on the amorphization of Al-Ni-Ce-C. In addition, the more addition of carbon decreases both glass forming ability and thermal stability of the Al-Ni-Ce-C system under ball milling conditions. Furthermore, comparison has been carried out between Al85Ni10Ce5+1 wt.% C amorphous powders and Al85Ni10Ce5glassy ribbons with respect to thermal stability.
Experiments on Heat Transfer in Fe Micrometer and Nanometer Powders
Authors: Ho Ching Yen , Chen Cheng Sao , Tsai Yu Hsiang
Published: July 2011

This paper investigates characteristics of heat transfer in Fe micrometer and nanometer powder. The understanding for thermal properties of the powder is advantageous to the advancement of the processing technologies such as laser cladding, laser sintering, powder metallurgy and its other applications. Nanosized particles possess characteristic physical and chemical properties different from those of bulk materials due to the confinement of electrons, excitons, and photons into small volumes. Therefore it is valuable to discuss the thermal behaviours of powders constituted by nanometer-sized particles. The powder is wrapped up in the slender tube. One end of the slender tube filled with powder is connected to the low constant-temperature reservoir and the other end is kept at room temperature. The temperature histories at the 1cm location of the slender tube from the low constant-temperature reservoir are recorded using thermalcouples. Powders of particles with the diameter sizes 20nm and 5000nm are employed in this experiment. The results show that the thermal diffusion in the 20nm Fe powder is faster than that in the 5000nm Fe powder.
Design of Chatter Measurement and Control System Based on Virtual Instrument
Authors: Li Jin Hua , Liu Yong Xian , Yu Yang , Han Jia Liang , Zhang Chao Biao
Published: July 2011

The technique to suppress regenerative chatter is to regulate the spindle speed around the mean speed to disturb the regenerative mechanism. According to the technique, it builds a platform to collect, process the machine working information and output control instruction. On the platform, some advanced algorithms are applied to analyze and finish the control task.