bluuebunny/crossref_metadata_2025 huggingface dataset:
A Study on Enterprise Performance Prediction Model by Reducing Financial Ratio
Authors: Cheng Ching Hsue , Huang Sue Fen , Chen Chen Tung
Published: February 2011

Financial ratio is an important indicator to represent the operation performance of an enterprise. Operating performance is defined as some important financial ratios which can indicate enterprise financial with positive operation and growth. The strength and weakness of financial health can not only show the results of operation performance of the organization, but also indicate its growth and potential in the future. However, how to select a set of representative financial ratios is an important issue for evaluating the operating performance of an enterprise. Traditionally, more related researchers have long used statistical methods for handling these problems. However, these conventional methods become more complex when relationships in the input/output dataset are nonlinear. Nevertheless, statistical techniques always rely on the restrictive assumptions on linear separability for the predictive variables, multivariate normality, and many of the models of financial performance violate these assumptions. Therefore, to overcome these existing shortcomings, the proposal proposed attribute selection method to extract financial ratio attributes and OWA based multiple attribute decision making (MADM) to analyze enterprise operating performance situation for stakeholders (i.e., management, investors, employees, shareholders and other interested parties). The financial ratios are collected from the open source information retrieval systems of dataset for publicly traded enterprises in Taiwan stock market from 2008. The proposed model use singular value decomposition (SVD) + ordered weight averaging (OWA) for evaluating enterprise operating performance. At last, the results indicate that the proposed selection attribute can explain enterprise financial situation, and proposed model can objectively evaluate the performance of enterprise.
Dielectric and Piezoelectric Properties of Lead-Free (Na0.5K0.5)NbO3- Bi0.5(Na0.85K0.15)0.5TiO3 Ceramics
Authors: Wang Chun Huy
Published: February 2011

Extending the investigations on (Na0.5K0.5)NbO3-based solid solution for lead-free piezoelectric ceramics, this paper consider the complex solid-solution system (Na0.5K0.5)NbO3–Bi0.5(Na0.85K0.15)0.5TiO3[NKN-BNKT]. (Na0.5K0.5)NbO3with 2 ~ 6 mol% Bi0.5(Na0.85K0.15)0.5TiO3has been prepared following the conventional mixed oxide process. A morphotropic phase boundary (MPB) between orthorhombic (O) and hexagonal (H) was found at the composition 0.96NKN-0.04BNKT with correspondingly enhanced dielectric and piezoelectric properties. The electromechanical coupling factor and dielectric constant are higher for compositions near the MPB. The dielectric constant (KT33), planar coupling coefficient (kp) and thickness coupling coefficient (kt)of 0.96NKN-0.04BNKT ceramics were 1273, 34% and 38%, respectively.
Cutting Parameter Optimization Technique for High Efficiency NC Machining
Authors: Cai An Jiang , Guo Shi Hong , Dong Zhao Yang , Guo Hong Wei
Published: February 2011

High efficient cutting process technique is one of the main development directions of cutting process technology in the future, a reasonable choice of NC machining cutting parameter is an important way to realize high efficiency NC machining. NC machining cutting parameter optimization techniques were studied, using BP neural network, milling parameters optimization model of aluminum alloy shell structure was built, and the structure of BP neural network was analysed, realizing the optimizing of the BP neural network model, the improving of the convergence accuracy, convergence speed, prediction accuracy, generalization ability of BP neural network model, which optimized the cutting parameters selection and predicted the processing efficiency to provide a theoretical basis for the selection of high efficiency NC machining cutting parameter. Production practice showed: the application of the optimized cutting parameters of BP neural network for processing could improve processing efficiency, reduce costs notablely while guaranteeing the processing quality, and achieve the optimization of integrated application efficiency for high efficiency NC machining and NC machine, so it has a higher promotional value.
Investigation of Roll Pass Optimal Design Based on IGA
Authors: Huang Bin , Xing Ke , Abhary Kazem , Spuzic Sead
Published: February 2011

The primary purpose of this study is to develop a genetic algorithm based computer-aided roll pass optimal design (CAROD) system to support the generalized roll pass design for rod rolling, where the final products are round bars with different sizes. The system was developed to minimize the number of roll passes, decrease the trails and errors in industry, as well as extend the work range of multi-pass rolling systems for rod rolling. Parametric equations were established for geometrical modeling and graphic plotting, which can realize to the parametric transformation for roll pass design and optimization. A methodology based on a hybrid model was proposed to choose passes with different profiles for the multi-pass rod rolling system. In addition, an improved genetic algorithm (IGA) was employed for the optimization of roll passes. A MATLAB program was designed to achieve all these objectives. To reduce the complexity and computational burden of the software, some reliable empirical formulas were applied in this system. Finally, the proposed approach has been applied in a rod rolling system; through simulation and comparison of results against analytical solutions, numerical analysis and experimental data presented by other researchers, it was found that this system is reliable, effective and easier to use.
Theoretical Analysis and Experimental Investigations of the Frictional Wear Characteristics of Nanometric Zirconia Ceramics
Authors: Li Chang He , Qi Ling Yun , Li Lin Gang , Ding Yu Cheng
Published: February 2011

This study was focused on the theoretical analysis and experimental investigations about the frictional wear of nanometric zirconia dental ceramics. An MRH-3 digital-display high-speed ring-on-block tribometer was used for frictional wear experiments. A PGI800 coarseness profiling instrument was used to test the width and the length of the grinding defects on specimen surfaces. An S-3500N SEM was employed in the microscopic observation of the surface morphology after the abrasion. Results indicated that the frictional factor and the wear rate of nanometric ZrO2 ceramics decreased significantly under identical working and frictional conditions compared with ZrO2. The wear mechanism of nanometric ZrO2 ceramics was micromachining and plastic deformation while the wearing mechanism of ZrO2 ceramics was brittle fracture and abrasive wear.
An ADRC Method for Vibrating MEMS Gyrosocope Drive
Authors: Niu Shao Hua , Gao Shi Qiao , Liu Hai Peng , Jin Lei
Published: February 2011

The stability and accuracy of the drive mode are important for the performance of vibrating MEMS gyroscope. At present, the PI-like controller is always used in the control of the drive mode of vibrating MEMS gyroscope. The PI-like control has good effect on rejecting the literal disturbance, but it can’t reject the time-dependent disturbance well. The disturbance for the MEMS gyroscope is so uncertain that the stability and accuracy of the PI-like control for the gyro are comparatively low. In this paper, an ADRC method for vibrating MEMS gyroscope drive is introduced, and it is proved that this method can rapidly and stably control the MEMS gyro drive mode by simulation and comparing with the PI-like method.
Study on Trispectrum Characteristics of MR Damper in Vibration Processes
Authors: Wu Fu Sen , Huang Yi Jian , Xu Shan
Published: February 2011

In order to find out a new type of MR damper for block making machine, the signals of displacement in the vibration process during the test are collected and the time series AR model of trispectrum for analyzing the dynamic characteristics of the MR damper is built. It turns out that , in different working conditions, slices of trispectrum are applied to obtain the signal’s non-Gaussian, nonlinear amplitude-frequency characteristics which are very important for us to select the optimum working parameters of the MR damper.
Statistical Process Control on Time Delay Feedback Adjustment Process
Authors: Wang Hai Yu
Published: February 2011

Control chart can be designed to quickly detect small shifts in the mean of a sequence of independent normal observations. But this chart cannot perform well for autocorrelated process. The main goal of this article is to suggest a control chart method using to monitoring process with different time delay feedback controlled processes. A quality control model based on delay feedback controlled processes is set up. And the calculating method of average run length of control charts based on process output and control action of multiple steps delay MMSE feedback controlled processes is provided to evaluate control charts performance. A simple example is used to illustrate the procedure of this approach.
On-Line Detection and Tracking Welding Control Technology of Thin-Walled Bellow
Authors: Ren Zhong Wei , Duan Zhen Yun , Zhao Wen Hui , Jiang Wei Wei
Published: February 2011

In order to improve the welding speed, quality and automation level of thin-walled bellow, on-line detection and tracking welding control technology is proposed which includes on-line detection system and tracking welding control system. Based on laser sensor, on-line detection system can rapidly filter the data, and the data is stored in a queue, the control system which is based on motion control card is developed by using ActiveX controls for programming, VB is used to develop the integrated user operating system, other control tasks are completely integrated on this system to realize real-time welding control bellow. Results showed that the system is reliable and effectively, the automation level of the bellow welding is greatly improved.
Influence of the Grinding Pass on Microstructure and its Uniformity of the Grind-Hardened Layer
Authors: Liu Ju Dong , Zhuang Jie Zhen , Huang Song Wei
Published: February 2011

On the basis of the surface grind-hardening experiment, the influence of grinding pass on the microstructure and its uniformity of the grind-hardened layer of 65Mn steel were studied using optical microscope, scanning electron microscope, and digital microhardness tester in detail. The results show that the grind-hardened layer generated by two-passes grinding has better uniformity compare with one-pass grinding along the length. Under the conditions of this experiment, grind-hardened layer generated by one-pass grinding has part unhardened region, and grinding pass has little remarkable effect upon the delamination of the macrostructure, the microstructure and its microhardness value of the hardened layer. The hardened layer comprises completely hardened zone and transition zone, and the completely hardened zone whose microhardness is about 780HV0.5 is of fine lathe martensites, residual austenite and a few carbides. The grind-hardened layer uniformity can be observably enhanced when two-passes grinding is adopted.
Modeling Slump Flow of Concrete Using Genetic Programming
Authors: Hsu Hsun Hsin , Chen Li , Kou Chang Huan , Chiu Chang Hung
Published: February 2011

The present study applied genetic programming (GP) to estimate the slump flow of high-performance concrete (HPC) using seven concrete ingredients. GP optimizes functions and their associated coefficients simultaneously and is suitable to automatically discover complex relationships between nonlinear systems. The results demonstrated that GP generates a more accurate formula and has lower estimating errors for predicting the slump flow of HPC than multiple linear regressions (MLRs).
Effect of Temperature on Oil-Gas Separation in Membrane Separation Based Transformer On-Line Monitoring
Authors: Wang Fei , Zhao Liang , He Peng , Zhao Xue Zeng
Published: February 2011

In the same conditions, the transformer on-line monitoring and off-line chromatographic analysis should be consistent, but the actual on-line monitoring is effected by the ambient temperature to make it is different from the off-line chromatographic measurement. this paper analyzes the theory of oil-gas separation, and develops a gas-oil separation test platform first, conducts an experiment about the changes of temperature based on the device, and then compares with the data of off-line measurement, gets the law of temperature affection on the oil-gas separation process, Finally gives the reason of influence of ambient temperature on oil-gas separation in on-line monitoring.
Simulation on the Effects of Misaligned Coupling on the Output Intensity Distribution in Water-Jet Guided Laser
Authors: Li Chun Qi , Yan Li Jun , Wang Yang , Tang Jing
Published: February 2011

Water-jet guided laser machining is a kind of material processing technology using water optical waveguide which is formed by coupling a high energy laser beam into variable-length water jet. In order to design the coupling unit and form the effective energy-jet, the research on the distribution of output intensity is beneficial to understand the structure of the coupling unit and improve the coupling efficiency of laser energy. This paper lists the different coupling misalignments in the coupling unit when laser couplings into water-jet. In this paper, the distribution of energy output intensity in water-jet guided laser is simulated with the ray trace theory under several different types of coupling misalignments with ZEMAX software, the results show that misaligned coupling provide various morphology of energy output intensity distribution: center peak morphology, ring peak morphology, and uniform peak morphology, which provides a method to optimize the energy output intensity distribution of water-jet guided laser.
Rigorous Coupled Wave Analysis of Surface Plasmon Resonance Sensor Based on Metallic Grating
Authors: Chen De Wei
Published: February 2011

Since the development almost a decade ago of the first biosensor based on surface plasmon resonance (SPR), the use of this technique has increased steadily. In this study, we theoretically investigated the sensing character of SPR sensor with reflection type metallic with Rigorous Coupled Wave Analysis (RCWA) method, and the mechanism is analyzed by the field distribution. It is found that the sensitivity of negative diffraction order, which goes higher quickly as the resonant angle increases, is much greater than that of positive diffraction order.
Research on Deep Plowing for Compacted Soil Based on SPH
Authors: Li Liang Jing , Zhang Guo Qing
Published: February 2011

In order to reduce the working power of tillage implement, made a combination of the down-cut rotary tillage and the up-cut rotary tillage applied on small agricultural machine is proposed. SPH method is applied to the three-dimensional numerical simulation for rotary soil process of rotating, and thus draws the force characteristics of rotary cutting tools under the different parameters. Combining with the simulation data of the up-cut rotary tillage, the work of tool matching is done. So it can make the force of the up-cut rotary blade and the down-cut rotary blade offset respectively. Accordingly, the small agricultural machinery can reduce energy consumption and improve efficiency. Based on these methods, we develop the small farming machinery which is fit for farming in compacted soil. The data and analysis program based on the study are of great significance for the small farming machine.
New Open Loop Control Improves Linearity of Piezoelectric Actuators
Authors: Ma Yu Ting , Huang Liang , Shao Wei Wei
Published: February 2011

The piezoelectric material is subject to hysteresis and creep resulting in a nonlinear relationship between the applied voltage and the output mechanical displacement. An approach for compensation of both the hysteresis and creep characteristics of a piezoelectric stack actuator is proposed by utilizing a switched capacitor charge pump. The new charge pump transfers the same amount of charges to the piezoelectric actuator quantitatively, and the actuator will be excited to change its length with constant step. Compared with voltage driving mode, experiments show that both creep and hysteresis of the piezoelectric stack driven by the charge pump are effectively reduced. A hysteresis reduction of 86.10% at 0.01Hz and 94.36% at 5Hz is achieved. At the maximum driving voltage, a creep reduction of 77% is obtained.
Vibration Analysis of High-Speed Vehicles under the Condition of Track Random Irregularity
Authors: Shi Hong Mei , Zhou Jia Liang
Published: February 2011

Track irregularity is the most important excitation source of wheel-rail system. The vibration characteristics of vehicle components and track components are analyzed in this paper under the condition of track irregularity by establishing the vehicle - track vertical coupling model. And the establishment of vibration differential equation and numerical simulation method for solving vibration response are described in detail. Finally, the results are given by MATLAB. The method is of great significance for evaluating the dynamic track irregularity and vehicle’s vibration at different running speeds.
Estimate of the Elastic Property of Microtubule Based on a Multiscale Model
Authors: Sun Yu Zhou , Wang Jin Yan , Gao Bin , Chang Li Wu
Published: February 2011

This paper presents a multiscale method to estimate the elastic property of the 13_3 microtubule. A microtubule is viewed as being formed by rolling up its planar encounter into the tubular shape, and the transformation is written into a set of equations with three geometrical parameters. The representative cell is chosen as an unit of two pairs of tubulin momoners. With the appropriate longitudinal and lateral interactive potentials, the strain energy density is calculated by deviding the cell’s energy by its spacial volume. The elastic property of microtubule is determined by minimizing the strain energy density, and the elastic constants are calculated in the thereotical scheme of orthotropic elasticity due to the geometrical meanings of the induced parameters. The advantage of the proposed method and its future application are discussed.
Numerical Simulation of Stress Field of PRMMC Caused by Current Impulse
Authors: Guo Rong Xin , Xia Hai Ting , Yang Bang Cheng , Huang Le Hui , Yan Feng
Published: February 2011

In this paper, based on the finite element analysis platform ANSYS, the stress field of particle reinforced metal matrix composites (PRMMC) caused by current impulse has been simulated. The cube cell model and multi-particle random distribution cell model are used in this simulation. The current field, temperature field and stress field of PRMMC caused by current impulse are given. The influence of material character of PRMMC, number or volume fraction of the particles in cell model, particles shape and distance on those fields is analyzed.
Influence of Outer Rubber Bushing Stiffness of the Lateral Rod on Multi-Link Independent Suspension Performance
Authors: Liu Xin Tian , Wang Yan Song , Zhao Li Hui , Huang Hu , Guo Hui
Published: February 2011

Rear multi-link suspension is built according to hard point parameters of a car. After the inner rubber bushing stiffness of the lateral rod is changed, the suspension performance were analyzed under the simulation test of parallel wheel travel, loading brake force and discussed with multi-body dynamics and Suspension Kinematics theory. The conclusion is drawn that under the test of loading brake force and wheel travel, changing the axial and torsion stiffness of rubber bushing has no effect on the suspension performance, changing the radial stiffness has a little effect on the camber angle, total track and toe angle. But the change of the radial stiffness has significant effect on the ride rate and wheel rate.
Research about Tool Management Based on FMS
Authors: Zhang Tian Shun , Zhang Yin Song
Published: February 2011

Tool management based on Flexible Manufacturing System (FMS) is important in settling the problems brought about by the machining of many kinds of productions in small scale. Through the research about tool management based on FMS, the flowing conclusions were concluded. The device configuration of tool management system based on FMS was provided, and the realization of tool coding was completed by use of flexible coding method. The information flow of tool and the function modules of the tool management system were investigated. The Tool management system was developed, the main functions were realized and some soft interface of tool management system was presented. Tool management system provides an efficient path to make system more flexible and improve the efficiency and quality of manufacturer.
Study on Vibration Grinding Deburring Finishing Process
Authors: Zhang Peng , Guo Xing Yu , Shan Shao Fu , Wu Chen Ge
Published: February 2011

It is difficult to remove for burr, especially for micro-hole burr, so the vibration grinding process is put forward and adopted to remove burrs. The mechanism of vibration grinding deburring is analyzed, and the experiments of micro-hole deburring are done with the technology of vibration grinding. From the results of the experiments, the conclusion can be draw that this technology can remove the burrs effectively. The vibration grinding process has the features of simple process system, low cost, easy operating. The Vibration grinding process technology method can also be used to remove burrs of other machining process. It has more application value in practice.
A High Precision Positioning Control Method Based on Learning Algorithm with Reference Model
Authors: Nakajima Kenji , Saitou Hiroyuki , Hashimoto Seiji
Published: February 2011

In this paper, a high precision positioning control method based on the learning algorithm with the reference model is proposed. The reference model is composed of a plant model and a feedback controller. In the proposed control method, disturbance, modeling error and nonlinear characteristic can be effectively compensated by the neural network-based controller, which learns the reference model. Moreover, the control-input saturation problem due to the over-learning for the neural network can be avoided. The effectiveness of the proposed control method is experimentally verified using the precision positioning equipment with nonlinear friction characteristics.
Spectral Finite Element Modeling of Cylindrical Shells with Passive Constrained Layer Damping
Authors: Zhang Xiang , Lou Jing Jun , Liu Gui Feng , Ding Shao Chun
Published: February 2011

This paper presents a spectral finite element method for a cylindriacl shell with a passive constrained layer damping treatment. A thin shell theory based on Donnell-Mushtari-Vlasov assumption is employed. The equation of spectral unit and the method of determination of natural frequency and modal loss factor are presented.
Effect of Surface Relaxation on Characteristics of Nanomachined Surface
Authors: Tang Yu Lan , He Ya Ting , Liu Guo Zhi , Fu Jing Xiang , Sun Hong , Zhang Ke , Wu Yu Hou
Published: February 2011

With the development of Micro-electro-mechanical systems (MEMS) and Nano-electro-mechanical systems (NEMS), dimension of their parts is required to nanometer scale, and the characteristics of machined-surface of nano-scale parts affect strongly its application. Surface relaxation plays an important role to the characteristics of the machined-surface. In this paper, machined-surface of monocrystal copper used as the specimen of surface relaxation, and its surface relaxation process is simulated. The influences of surface relaxation on surface energy, atom array, surface roughness, surfaces hardness and surface residual stress of the monocrystal copper are analyzed. Results show that surface energy and surface hardness decrease due to relaxation; work-hardening can’t be completely eliminated by the relaxation; compression residual stress of the machined surface is changed gradually to tensile stress during the relaxation. These research results are very helpful to the application of nano-machined parts.
JIT Single Vehicle Scheduling in a Mixed-Model Assembly Line
Authors: Rao Yun Qing , Wang Meng Chang , Wang Kun Peng
Published: February 2011

This paper focus on single vehicle scheduling problem minimizing the line-side inventory of mixed-model assembly lines, considering the assembly sequence as an input.An exact algorithm is proposed based on three newly introduced concepts: conflicting, tight subset and complete conflicting subset, which divide the transportation operations into three classes.The solution generated by the algorithm is proved to be optimal. The algorithm is compared with the most popular FCFS (first-come, first-served) rule, and results shows the advantages of the algorithm, especially for large instances of the problem.
Effect of Particles Size on the Properties of Nano Core-Shell Ni/TiO2 EMR Fluid
Authors: Tan Suo Kui , Song Xiao Ping , Li Qiao , Guo Hong Yan , Ji Song , Zhao Hong
Published: February 2011

By means of mechanical properties test， the relationship among particle size，electric field，magnetic field ,electromagnetic field and shear ratio on the Ni/TiO2/Urea core-shell particles electrorheological fluid properties analyses. It is found that with increasing particle size， the property of electrorheological fluid decreased, and with increasing shear ratio the property of electrorheological fluid increased for same composition ER. At same time, the smaller of particle size, the higher of ER properties, but there is a critical value for shear ratio, the properties of ER is near value for same composition ER fluid. In magnetic field, the properties of ER showed a contrary result, the smaller of particle size, the lower of ER properties，and electromagnetic field make the properties increase.
Research of Feature Extraction Method on Facial Expression Change
Authors: Liu Jin Qing , Fan Qun Zhen
Published: February 2011

In this paper, the purpose is to find a method that can be more suited to facial expression change and also improve the recognition rate. The proposed system contains three parts, wavelet transform, Fisher linear discriminant method feature extraction and face classification. The basic idea of the proposed method is that first extract the low-frequency components through wavelet transform, then the low-frequency images mapped into a low-dimensional space by PCA transform, and finally the utilization of LDA feature extraction method in low-dimensional space. The algorithms were tested on ORL and Yale face database, respectively. Experimental results shows that the proposed method not only improve the recognition rate, but also improve the recognition speed. This method can effectively overcome the impact of expression changes on face recognition, and play a certain role in inhibition of expression.
A Multi-Objective Robust Preference Genetic Algorithm Based on Decision Variable Perturbation
Authors: Zhu Bing Kun , Xu Li Hong , Hu Hai Gen
Published: February 2011

Multi-objective optimization is a challenging research topic because it involves the simultaneous optimization of several complex and conflicting objectives. However multi-objectivity is only one aspect of real-world applications and there is a growing interest in the optimization of solutions that are insensitive to parametric variations as well. A new robust preference multi-objective optimization algorithm is proposed in this paper, and the robust measurement of solution is designed based on Latin Hypercube Sampling, which is embedded in the optimization process to guide the optimization direction and help the better robust solution have more chance to survive. In order to obtain different preference of the robust solutions, a new fitness scheme is also presented. Through the adjustment of fitness function parameter preference, robust solutions can be obtained. Results suggest that the proposed algorithm has a bias towards the region where the preference robust solutions lie.
Study on Rebuilding of X53 Milling Machine for Numerical Control
Authors: Chen Shuang , Lai Wu Jun , Liu Feng
Published: February 2011

CNC technology and equipment is an important foundation for modern manufacturing industry.In this paper, mechanical system and hardware was rebuilded on the X53 Milling Machine for Numerical Control based on the transformation of economy, convenience, practicalityand reliability. After the transformation , mechanical transmission part has high static and dynamic stiffness, CNC system has integration and high reliability, strong function.
Constrained Model Algorithmic Control for the Generalized Hammerstein Model with Impulse Response
Authors: Song E Nuo , Li Na , Wang Guo Xin
Published: February 2011

A Generalized Hammerstein Model with Impulse Response for symmetric nonlinear systems was presented in this paper. A hyper-quadratic object function was developed by adding highest order control input term with a symbolic function into the object function, and a constrained multi-step model algorithmic control for the non-minimum phase systems with open-loop stable characterization was established by forcing the control input with saturated limitation. The algorithm with one control policy can guarantee the simulative results without steady state deviation and the control input being converged to a varying region centered in the zero-point. Simulated results validated the constrained model algorithmic control for Generalized Hammerstein Model with impulse response is reasonable and applicable.
A Study of Grid Resource Management Model Based on Ant Colony Algorithm
Authors: Zou Xian Chun , Ma Yan , Song Ning
Published: February 2011

This paper analyzes grid resources organization, elaborates on the fundamental principles of the Ant Colony Algorithm, and proposes a grid resource discovery method based on the Ant Colony Algorithm. We consider users request ontology as ants, take search resource as food, and food source is the node of search target. The process of ants to find food is similar to the process of discovery grid resources.
The Out-of-Plane Instability of a Bending Beam with Multiple Loads
Authors: Li Yu Mei
Published: February 2011

This paper presents the characteristic equation of out-of-plane instability when a bending beam, which is composed of two beams, is under lateral force and vertical force. It clarifies a method which can calculate the out-of-plane instability load of a structural component with main jib and counterbrace.
Application of Constructed Wetland Technology in Urban Landscape Designs
Authors: Tian Mi Mi
Published: February 2011

China is still in the preliminary stage of applying the constructed wetland technology to the designing of urban landscape. This paper focuses on the research of the technology's application in the urban landscape design in Chinese cities and the detailed process flow, and gives the readers a brief introduction to the background of the technology and relevant research development in foreign counties. Through the analysis of different cases this paper indicates the multiple benefits constructed wetland technology can bring to urban landscape designs.
Realization of Handwheel and Tool Setting of Micro Milling Machine Based on PMAC
Authors: Lu Xiao Hong , Jia Zhen Yuan , Zheng Xiu Yan , Yu Xiao Yan
Published: February 2011

The realization of the handwheel function is a key problem for development of numerical control system of micro milling machine. This paper introduced the interface specifications and hardware connecting methods of handwheel NK100AB2, developed control program based on PMAC (Programmable Multi-Axis Controller) and industrial personal computer, finally achieved the function of axes selecting and the feed rate selecting. Based on the traditional edge detector tool setting method, an improved tool setting method is proposed. The inverted micro milling cutter hilt is used to replace the traditional edge detector, which avoids the opposite reamer error caused by the irregular cutter blade shape, finally, tool setting function is achieved through the collecting of electrical signal. The research will provide a useful reference for the realization of handwheel and tool setting of micro milling machine based on PMAC.
Research on State Recognition and Wear Lifetime Predication of Tribo-System
Authors: Yu Xia , Li Juan , Jin Long
Published: February 2011

Methods of tribo-system health state recognition and wear residual lifetime prediction are proposed based on wear failure mechanism, many uncertain influence factors also being taken into consideration. It mainly deals such engineering problems as tribological behavior measurement, friction pair surface testing, experiment data collection and management, feature extraction and health state recognition, and so on. It outlines the basic frame of the application of PHM technology in the tribo-system.
Applied Design and Research of RFID for Sports Competitions
Authors: Xie Jing Chen
Published: February 2011

The purpose of this study is to provide necessary test management and security surveillance for players of long distance competitions through the applied design of RFID for sports competitions. The achievement of the applied design of RFID in this study is valuable in the practical aspect for long distance swimmers or marathon runners in sports competitions. This design can not lonely reduce the cost of surveillance management, but also locate every player. When there is an emergency, timely and precise steps can be performed for rescue. While the patent application of the design result of this study is being processed, it is expected that related manufacturers interested in this applied design can assist with the development of the product and, in the process of practical verification, find out problems and provide suggestions as references for future improvement.
Photocatalytic Activity of TiO2-HZSM-5 Composite for C.I. Reactive Red 2 Degradation
Authors: Zhang Li Fang , Wang Peng , Zhang Wen Jie
Published: February 2011

A composite of TiO2 and HZSM-5 zeolite was used for photocatalytic degradation of C.I. Reactive Red 2(RR2). With TiO2 concentration of 320 mg/l, the optimum composite was composed of TiO2 and HZSM-5 by the weight ratio of 1:10. The composite showed higher activity than the P25 powder in calcination temperature range from 400 to 600 oC and 450 oC can be the optimum calcination temperature. When irradiation time was 40 min, the composite degraded 96.8% of the initial RR2. 94.9% of the dye was degraded in 70 min using pure TiO2. The RR2 degradation rate increased constantly with increasing composite photocatalyst concentration up to 320 mg/l. The activity of the composite grinded without ethanol was less than that of the composite photocatalyst grinded with ethanol.
Manufacturing of Biocompatible Implant Component Using Rapid Prototyping Technology
Authors: Yusof Yusri , Samson Mohd Noor Hakim
Published: February 2011

The purpose of this research is to study the manufacturing of biocompatible implant component by using rapid prototyping technology, in particular of 3D printing process. The biocompatible material consist of 80% cobalt-chromium-HAP were prepared by mechanically blended with 10% maltodextrin and 10% polyvinyl alcohol as binding mechanism for 3D printing process. Test specimens were fabricated using experimental 3D printing machine followed by sintering process. The characteristic of the composites were studied using various techniques including Scanning Electron Microscope (SEM and EDS), hardness test, flexural test, porosity and density measurement. The results show that the biocompatible cobalt implant composite can be fabricated successfully using 3D printing process. Further investigation can be carried out on the samples to study the toxicity, chemical reaction and cell reaction for implant application.
Structure and Compressive Properties of Silver Foams with Various Porosities
Authors: Asavavisithchai Seksak , Oonpraderm Anyamanee
Published: February 2011

The sintering and dissolution process (SDP), in which NaCl is used as space holder, was used to produce open-cell Ag foams with various pore sizes. The content, size and shape of NaCl particles dictate the pore architecture of the foams. The yield strength of Ag foams decreases with increasing porosity. Of equivalent porosity, the yield strength of the foams with larger pore size is also higher than the foams with smaller pore size.
Effect of L/D Ratio on Al-Si Functionally Graded Material Cast through Centrifuge Technique
Authors: Aithal Kiran , Narendranath  , Desai Vijay , Mukunda P.G.
Published: February 2011

Functionally Graded Material (FGM) is a class of material wherein the properties and structure are varied intentionally from one side to the other side of the specimen. This paper describes the effect of L/D (Length to Diameter) ratio of the cast on cast Al-Si FGM. The present study uses Al-17%wt Si to cast FGM's. The cast is evaluated for Microstructure and Hardness all along the length of the specimen. Three L/D ratios: 0.5, 1.0, 1.5 were cast using the Centrifuge Technique. The microstructures showed that enrichment of primary Si was largest in 1.5 ratio compared to other two. Hardness value of the cast at the upper and lower region were examined and found that gradient of hardness was more in 1.5 case. High volume percentage of primary Si was nearly 26% in the upper region and a hypoeutectic structure in the lower region.
Automatic Ultrasonic Inspection Method of Railway Axle and its Remaining Life Prediction
Authors: Hu Hong Wei , Li Xiong Bing , Wang Xiang Hong , Shao Yi Min
Published: February 2011

With the high speed railway utilization, the probability of defects or fatigue cracks in railway axles is increased. An automatic ultrasonic inspection system for railway axles is presented. This system uses combined probes and inspects the defects with spiral trajectory along the axis of the axle. Through the matrix representation of C-scan image element, a defect edge extraction method is adopted, with which the defect parameters of crack are obtained automatically. Based on these defect parameters, the stress intensity factor is assessed by svm regression and the method to predict remaining life is proposed.
Discussion about Calculation Principle of Carbon Emission in Low-Carbon Architectures
Authors: Zhu Xiao Fei , Lv Da Wei
Published: February 2011

There are more and more low-carbon architectures around us gradually. Low-carbon architectures is to decrease the use of renewable energy, improving energy efficiency, reduce carbon dioxide emissions during materials and equipment manufacturing, construction and the whole life of building use. According to calculating carbon emissions of the building materials in production, construction, using and removal, and the process of calculation, the total sum of carbon emissions in the life cycle was calculated.
Characteristics of Rotary Draw-Bent Tubes for the Hydroforming
Authors: Joo Byeong Don , Jang Jeong Hwan , Lee Hyun Jong , Moon Young Hoon
Published: February 2011

Hydroformed parts have higher dimensional accuracy, structural strength, and dimensional repeatability. The pre-bending process is an important process for the successful hydroforming in the case where the perimeter of the blank is nearly the same as that of final product. At initial pre-bending stage, the variations of wall thickness and cross-section have effects on the accuracy of final products and quality. Because of a relatively excellent productive velocity, geometric size precision and reliance of product qualities, rotary draw bending is widely used. This study shows the bendability such as cross-section ovality, springback ratio and thickness variation in the various conditions of materials.
Marginal Design Evaluation for CAM Obtained Zirconia Based Crown Frameworks
Authors: Sandu Liliana , Topală Florin , Porojan Sorin
Published: February 2011

Aim: The purpose of the study was to investigate the influence of two factors on the fit of zirconia-based frameworks: the teeth preparation design and the achieving technology. Materials and methods: Sixteen maxillary molar working dies were created from two master dies and divided into four groups. The master dies were fabricated with two different preparation designs: chamfer, and shoulder. Zirconia based crown frameworks were obtained through classical modeling/CAM, and CAD/CAM procedures. For both the Cercon system was used. Marginal and internal fit for all restorations were measured on the dies using cross-sections. Results: The mean gap size varied between 81.07 and 98.53 μm for the tested groups. There was no the significant difference in the fit of CAM obtained zirconia-based frameworks, irrespective of the studied technologies or preparation designs. Conclusion: Based on the results of this study, both marginal designs and achieving technologies are within acceptable ranges.
Ethylene Polymerization by Thioether Bridged Dinuclear Titanocene Complex
Authors: Nie Yu Jing , Yang Ming
Published: February 2011

The thioether bridged metallocene complex [(C5H5)Cl2TiC5H4CH2CH2]2S has been synthesized by treating the dilithium salts of the thioether bridged cyclopentadienyl ligand with two equivalents of C5H5TiCl3 and characterized by 1HMNR and elemental analysis. After activation with methylaluminoxane (MAO), the complex was highly active catalysts for homogeneous ethylene polymerization in toluene. The influence of the molar ratio [MAO]/[Cat], the catalyst concentration, time and temperature have been studied systematically. The catalytic activity of 1 is 3.63×105 g PE/mol•Cat•h. Rising the polymerization temperature decreases the catalytic activity for 1. A high concentration of the catalysts drops the catalytic activity as well as the molecular weight of polyethylene for the complex. High temperature gel permeation chromatography (HT-GPC) proves the production of polyethylene with a broad molecular weight distribution (MWD).
Modeling and Decoupling Control of Grid-Connected Voltage Source Inverter for Wind Energy Applications
Authors: Mao Jing Feng , Wu Guo Qing , Wu Ai Hua , Zhang Xu Dong , Yang Kun
Published: February 2011

This paper investigates the modeling and decoupling control of grid-connected voltage source inverter (GC-VSI) for wind energy conversion system (WECS) applications. Firstly, the typical configuration and operation principle of the direct-driven grid-connected WECS are analyzed. Then, by means of input-output modeling method and instantaneous active power theory, a time domain mathematical model of the GC-VSI is set up. Besides, in order to resolve the GC-VSI active current and reactive current cross-coupling nonlinear control problem, a vector decoupling control method for the GC-VSI firing pulse generation is deduced in the dq synchronous rotating coordinates. The proposed decoupling control method can realize the active power and reactive power of the GC-VSI injected into the grid are regulated independently. Finally, the performance of the proposed GC-VSI system is evaluated by using MATLAB/Simulink simulation.
Study on Mechanical Properties of New Type Chain Concrete Blocks with Ecological Function
Authors: Zhang Xiao Lei , Li Jun Jie , Huang Zun Xin , Chen Yong Hao
Published: February 2011

A drainage experiment on chain concrete blocks with ecological function has carried out to study their mechanical properties. This paper presents the stress condition, stability and the effect of infilling gravels, and analyzes the anti-scour capability of the chain concrete block revetment, finally provides some usage suggestions. The results indicate that: The stability and anti-scour capability are good after the blocks are filled with gravels. The infilling gravels are scoured and a certain slope is formed. It is suggested to consider the residual volume of the gravels to save investments. The average thickness of the cushion is suggested to be 15cm to keep the dry stones smooth. The new type chain concrete blocks have such advantages as high anti-shear stress and stability, well permeability, ecological protection, easy construction and low cost.
Manufacturing Process Planning to Evaluation on Failure Causes for Lithography Machine: Analytic Hierarchy Process
Authors: Ko Po Sheng , Wu Cheng Chung
Published: February 2011

This study conducted hierarchical analysis on the evaluation item of the stability index of the lithography machine, and established a set of evaluation mechanism for failure prediction, in order to provide references and indicators of troubleshooting for lithography machine. The results showed, when the lithography machine is out of order, the possible failure causes are mainly be found based on the past experiences. Moreover, engineers’ skills in maintenance of lithography machine should be also considered. It is clear that, technology-centered is the current trend in today's semiconductor technology processing. In the weight analysis of rating index for complexity in broken Wafer, the most important problem is the lithography machine error due to failure in its components. Good design and configuration of semiconductor lithography process in the early stage can enhance the rapid maintenance of lithography machine in case of malfunctioning effectively. For timely maintenance, maintaining the organization stringency needs to be improved. This study also found that, under the good configuration of maintenance system, adequate information is closely associated a good system. As for lithography process in semiconductor industry, the complexity of broken Wafer is first considered. Thus, the overall lithography process of semiconductor relies on engineers’ experience. More specifically, a quick error interpretation and repair are required in field maintenance. As in a competitive market of semiconductor processing with high-tech and high-cost, a timely maintenance in the lithography machine is urgent and requested.
Effect of Heat Treatments on the Bio-Corrosion Resistance of Magnesium Alloy Mg-8.0Al-1.0Zn-xGd
Authors: Li Lei , He Rui , Huang Guo Jie , Xie Shui Sheng
Published: February 2011

In order to improve the bio-corrosion resistance of magnesium alloy Mg-8.0Al-1.0Zn-xGd in the simulated human fluid, different heat treatment procedures were studied. Results showed that annealing treatment lowered the alloy’s corrosion resistance and hardness, while T6 treatment (solid solution+ aging) improved the alloy’s corrosion resistance and hardness. Microstructure analysis showed that the β phase dissolved into α phase after the annealing treatment. Hence, annealing treatment decreased the alloy’s corrosion resistance. However, lots of β-phases were precipitated in the T6 heat treatment, and they impeded the corrosion extending.
Kinetic Analysis of Thermal Decomposition of Epoxy Resin/Polyaniline Nanocomposites
Authors: Shan Shao Yun , Jia Qing Ming , Jiang Li Hong , Wang Ya Ming
Published: February 2011

Polyaniline(PANI) nanofibers were firstly prepared by rapid mixture method, EP/PANI nanocomposite was obtained by in-situ adding the PANI nanofibers to epoxy resin(EP). Thermal degradation behavior of PANI and kinetic analysis of thermal decomposition of EP/PANI nanocomposites were investigated in detail by using thermogravimetric analyser (TGA) in inert atmosphere. Typical three step decomposition profiles of PANI were obtained. On the basis of isoconversional analysis by the methods of Kissinger-Akahira-Sunose method(KAS method) and Flynn-Wall-Ozawa method(FWO method), it was found that the value of the activation energy of EP/PANI nanocomposites is higher than that of pure EP, which proves that PANI nanofibers obviously improve the thermal stability of pure EP.