bluuebunny/crossref_metadata_2025 huggingface dataset:
Design and Development for the Self-Expandable Packer Test-Bed
Authors: Qin Jian Jun , Hua Yan , He Zhen Long
Published: September 2013

A new self-expandable packer test-bed for performance testing is developed against many problems of self-expandable packer test-beds which are in existence during detection process, for instance, imitative open hole cannot be used to detect environments in the downhole, size of a specimen for detection is undersize, pressure in experiments is low and detailed data cannot be gathered in development phrase. The new test-bed makes autoclave a modular design, which can test various performance of a specimen in a high-pressure environment and match relevant replacement parts of autoclave with the purpose of doing a variety of experiments on specimens. In this way, many existing problems of test-bed during the experiments can be solved.
Optimization Analysis of XML Embedded System Based on J2ME Platform
Authors: Ji Jian Hua
Published: September 2013

In the 21st century, with the rapid development of computer science and technology, the usage of all kinds of embedded system is increasingly common. The function of the embedded system is more and more strong, and there has many kinds of embedded systems, the range of application is gradually expanded. With the requirements of application, embedded system experienced the changes from single application system to integrated system. However, because the current integrated systems mostly are limited to the stand-alone usage, this does not give full play to the application and function of the embedded system. The paper was based on the limitations of XML embedded system of the J2ME platform, and it provided optimization design to current limitations, at the same time it made the application and function get the promotion.
Resource Utilization of Digital Library in Full View Analysis of SWOT
Authors: Gao Li Ping
Published: September 2013

With the development of information technology, the network information resource grows rapidly. The information collection, processing, storage, retrieval and utilization of the construction of Library Digital Resource have become the important issues of library management. It is also the new hot topic of Library digital. Firstly, this article analyzes the using of digital library resources in developed countries. According to the survey data, it analyzes the utilization of Chinese digital library resources and digs out the main problem. It uses SWOT method to analyze the association of external environmental and internal functional factors of the entire construction of digital library resources. Then it puts forward some scientific suggestions of the development of digital library which provides theoretical basics and technical supports for the construction of the digital library.
Design and Implementation of Books Management System Based on JSP
Authors: Liu Jian Guo
Published: September 2013

In order to meet the requirements of the modern books management, the thesis tries, based on the JSP, to propose books management system architecture design, the function module design and the database design and the function implementation scheme.
Research on Web Page Staticize Technology in E-Commerce System
Authors: Bai Xiao Jun , Wu Fu Dan
Published: September 2013

Dynamic webpage technology is widely used in web development, but for a large e-commerce system, it will bring huge workload to the server if access database frequently and create web page dynamically, thus the server may breakdown on this condition. In this paper, the author introduced the techniques of web page staticize, based on the design of an E-shop system, puts forward the principle, strategy and method for staticizing dynamic page, and verified the effectiveness of this solution by experiments.
Decision Support Configuration Design in Broadcasting and Television Business & Operation Support System
Authors: Yin Fu Lian , Lu Lu , Gao Ya
Published: September 2013

A decision support system (DSS) for broadcasting and television is proposed in this paper. This broadcasting and television DSS fills the blank of broadcasting and television business & operation support system (BOSS). It is also bridging the industry chain of broadcasting and television system. The result of typical model for broadcasting and television DSS proves its validity.
Research on Data Item Correlation in Dataspace
Authors: Jiang Shuo , Yu Shou Jian , Li Ye Feng
Published: September 2013

4-ary vector expression was defined by 3-ary vector to describe subject and data item in dataspace. Association method between subject and data item was represented. Correlation of data item was defined by 4-ary vector. Correlation and association way between data items were represented by 4-ary vector. The validity of these methods was verified in technical document library.
Design and Implementation of the HTTP Proxy Server in SSL VPN
Authors: Chen Ping , Shen Li Jun , Zhang Tao , Yu Han
Published: September 2013

With the deepening of the degree of enterprise information,SSL VPN is gradually becoming an important way for remote enterprise users safely connecting with internal servers.SSL VPN takes the role of being an agent of remote clients to access the internal servers.Such function is called HTTP Proxy Server.To avoid being attacked,HTTP Proxy Server encrypts the IP of internal Web Server.This paper presents the design and implementation of the secure HTTP Proxy Server in SSL VPN.
Website Data Mining Based Hyperlink Analysis Method and its Application Research
Authors: Feng Lu , Wen Zhan Quan , Lin Jie Mei
Published: September 2013

In the paper, we use the principle of hyperlink analysis method to mine the website data according to the indicators of the hyperlink analysis. This method can evaluate the impact of the website based on the data which is mined from the website. The application of the results of its evaluation can be used in two hands. On the one hand, the analysis of website impact can help to find the status and problems of the website and propose improved strategies; on the other hand, it can help to analysis the applicability of the evaluation indicators of the hyperlink analysis method for the evaluation of the impact of the website.
Categorizing and Identifying with Covert Channel Based on Information Flow Analysis
Authors: Jiao Yang , Xie Li Jun , Zhao Zhi Yuan
Published: September 2013

Based on the security OS (SLinux) designing and implementing, this paper adopted information flow sequence to represent information flows and covert channels. Categorized the covert channels according to their information flow characteristics and discussed the integral method of dealing with covert channel. On this basis, proposed a genera l framework for covert channel identification founded on information flow analysis, and designed the optimization rules of covert channel identification. The framework and the rules can decrease the illegal flow of misinformation by restricting in formation flow combination spread, and provide the basis process for improving of analyzing covert channel.
A New Routing Selection Algorithm in Cognitive Mesh Networks
Authors: Ren Zhi , Zheng Yuan , Liu Dong Yuan , Lei Hong Jiang
Published: September 2013

In cognitive networks, the existing RASR routing algorithm does not consider channel usage ratio of the PU and results in an unstable path problem. To address these issues, a new Routing Selection Algorithm in Cognitive mesh networks (RSAC) is proposed in this paper. RSAC is designed by piggybacking the information of link stability factor which is the sum of the channel usage ratio of secondary users and choosing routes based on it. It enhances the route stability, improving the success ratio of data packets transmission, reducing the average end-to-end delay. Theoretical analysis and simulation results show that RSAC outperforms the RASR routing algorithm in terms of the success ratio of data packets transmission, the average end-to-end delay.
Classifying Sentiment Based on LDA Model
Authors: Peng Qing Xi
Published: September 2013

Online reviews as a new textual domain offer a unique proposition for sentiment analysis. Their short document length suggests any sentiment they contain is compact and explicit. Although supersized methods have obtained good results, a large amount of corpus should be trained beforehand. Recently, topic models have been introduced for the simultaneous analysis for sentiment in the document. However, the LDA model makes the assumption that, given the parameters the words in the document are all independent. It obviously isnt the case. The words in the document express the sentiment of the author. This paper proposes a model to solve the problem. We assume that the sentiments are related to the topic in the documents. A sentiment layer is added to the LDA model to improve it. Experimental result in the dataset demonstrates the advantage of the proposed model.
Research on Reliability of Software in Internet of Things for Risk Assessment and Reengineering
Authors: Wang Jun , Shao Li Hu
Published: September 2013

In order to establish software system in application conditions of Internet of Things (IOT) on reliability of evaluation system and methods. This paper puts Quality of Service (QoS) of the protocols and reliability assessment of software system together, with aims at research on very large complex software system in reliability assessment, which is consisted of individual components in distribution of the perception layer, network layer and application layer of IOT and subsystems. At the same time, this paper adopts reengineering technology to realize the reliability evolution of software system in IOT application conditions, and improve the reliability index of software assessment further.
One QoS Routing Algorithm for Load Balancing in IP Backbone Networks: Design and Simulation
Authors: Cai Zhi Qiang , Lv Rong Sheng , Sun Shi Wen
Published: September 2013

Quality of Service (QoS) routing is intent to find feasible routes according to QoS constraints and optimize utilization of whole network resources. In order to solve bandwidth-guaranteed QoS routing problem, a simple but effective routing algorithm based on precomputation scheme with load balancing consideration, is proposed. The algorithm is implemented and simulated using Network Simulator (NS2). Research results showed that the proposal can keep some links free from becoming bottlenecks earlier, avoid congestion caused by unbalanced traffic load distribution, and improve performance of IP backbone networks.
Research on Road Adhesion Coefficient Estimation for Electric Vehicle under Tire Cornering Condition
Authors: Chen Yi , Li Xue Feng , Qu Tong
Published: September 2013

The research came up with a road adhesion coefficient estimation method for electric vehicle under tire cornering condition, compared with the previous researches that mainly focused on tire longitudinal behaviors. The designed identification method first distinguishes the states of small longitudinal slip and large longitudinal slip in the condition of tire cornering. Then estimation algorithms for the two conditions above operate respectively. By designing the simulation and selecting typical road conditions, the applicability and validity of the algorithm have been verified. The estimation method can be used to serve the electric vehicles dynamics stability control system.
Improved ADOPT Algorithm for the Problem of Multi-Robot Communication Failure
Authors: Ge Bin , Liu Ling
Published: September 2013

DCOP (Distributed Constraint Optimization Problem) is currently the most widely used in multi-robot communication algorithm problem, Adopt algorithm is a kind of algorithm which is relatively perfect; it can transport messages accurately under the harsh environment of communication. It is completely asynchronous algorithm, through analyzing algorithm for local agents to obtain the global optimal solution, in the comparison of each algorithm can see that ADOPT algorithm not only can well solve the problem of communication failure, and the algorithm set up mechanism of terminate detection, it can make the algorithm stops on the optimal solution, and effectively solve the deadlock problem. The text use ADOPT algorithm to analyze how to solve the problem of multi-robot communication failure, and improve the algorithm to take messages more accurately and effectively.
Research on the Friction Performance of Bionic Surface Based on the Clamber Animal Foot Pad
Authors: Su Chun Jian , Fu Zhou Yu , Sun Hui , Shen Xiao
Published: September 2013

The clamber animal foot pads were researched by the Super Depth of Field3D Microscopic System marked VHX-600 and the flexible non-smooth surface friction mechanism of clamber animal foot pad was analysed through bionic tribology. The total friction includes two aspects: a) The sliding friction caused by the adsorbability between clamber animal foot pad and external surface. b) The embedding resistance caused by the external surface micro particles embedded into clamber animal foot pad. The mathematical model of single convex hull was built and the different center distance bionic surfaces were designed, the friction contact simulation of bionic surface was done by ANSYS and the friction performance of bionic surface was verified through the plane friction testbed.
The Reliability Analysis of Car Electronic Horn Sound Level Based on the Fault Tree
Authors: Sun Quan Ying , Cui Si Hai , Wang Yi Lin , Yu Xiao Dong
Published: September 2013

Through access to information obtained by the probability of the basic event to occur as the known data, using the structure function method of the diagram analysis and fault tree calculation method, calculated the probability about the sound level decline of car electronic horn, then known reliability and tested the sound level aspects of the car electronic horn is the stable and reliable, found out the main reasons of the sound level decline at the same time, proposed the prevention and improvement measures, improved the reliability of the car electric horn in sound level by the implementing measures.
Simulation Analysis on Mechanical Effect Based on ADAMS and Matlab Software
Authors: Huang Xing Yu , Wu Xiu Hua
Published: September 2013

Muscle length change and mechanical effect have an important meaning to the analysis of the relationship between the muscle fatigues. It can be widely used in muscle physiology pathology research which played a role of technical guidance to cure muscle fatigue damage and prevent muscle fatigue. This paper analyzes the muscle physiology theory. It concludes that the muscle is composed of a series of muscle bundle which is made up by a set of parallel muscle fiber through the theoretical analysis. Then, it sets up a model formula of muscle length change and stress relationship based on the mechanical theory. It gets muscle movement and mechanical related parameters by measurement method. It uses the ADAMS and Mat lab software to do the simulation analysis on the muscle movement. It establishes the muscular movement speed and the 3 d graphics of muscle displacement under the action of muscle force through the Mat lab software. Through the ADMAS software it establishes the displacement curve under the action of muscle forces which changes with time and it provides a theoretical reference for the research of muscle length change and mechanical relationship based on muscle physiology theory.
Detection Model of Eggs Based on Improved BP Neural Network
Authors: Yang Jian , Xia Chun Yan , Peng Zhan Wu
Published: September 2013

In order to improve the precision in the detection of egg fresh degree, an improved BP neural network ensemble method was proposed herein, where the K-means clustering was applied to optimize better neural network individuals and Lagrange multiplier was used to not only compute the weight of neural network individuals, forecast egg fresh degree (Haff value). Based on the image of eggs acquired by the machine vision device, taking color characteristic parameter (H, S and I) of the central area of the egg as input and Haff value of the egg as output, a model was constructed. With experimental verification, it was calculated that the mean square error of Haff value was 1.3764 and the generalization ability of the network was high.
Design of a Monitoring System of Tower Crane Based on uC/OS-II
Authors: Yang Xiang , Zhou Kun , Wang Wei
Published: September 2013

At present, there are some shortcomings in tower crane protect device. In order to reduce the difficulty of the operation, and ensure the safety of the crane, we design this monitoring system. For the purpose of improve tower crane self-control ability and self-diagnosis ability .we propose a design of tower crane monitoring system , a combination of sensor technology and wireless technology. We choose the stm32 as the master chip, and choose uC/OS-II as the operating system. All kinds of tasks could coordinate with each other, and orderly operation. UCGUI is used to realize human-machine interface. It can display real-time operating parameters of the tower crane. The central monitoring room can monitor multiple tower cranes through wireless communication technology.
Sorted QR-Decomposition Based Parallel Detection Algorithm for MIMO Systems
Authors: Liu Li , Wang Jin Kuan , Song Xin , Han Ying Hua , Yan Dong Mei
Published: September 2013

Multiple input multiple output (MIMO) wireless communication system can increase system capacity enormously. Maximum likelihood (ML) detection algorithm can obtain the optimal detection performance with exponential computational complexity that results it difficulty to use in practice. Classical ordered successive interference cancellation (SIC) algorithm suffers from error propagation and high complexity, so an improved parallel SIC algorithm based on Maximum likelihood (ML) detection is proposed, in which signal detection is performed at two stages. ML detections for one layer is carried out firstly, and redundancy of candidate sequences are selected to perform parallel detection for improving detection performance for next step. Sorted QR decomposition based SIC algorithm are performed in second step in order to reduce calculating complexity. By adjusting the number of candidate sequences, tradeoff between detection performance and calculating complexity can be obtained properly.
Average Consensus of Sensor Networks with Uncertain Markov Topologies
Authors: Kim Won Il , Xiong Rong , Wu Jun
Published: September 2013

Average consensus is studied in mean square sense of distributed inference in a sensor network under Markov communication topology of uncertain transition probability. A sufficient condition is presented for average consensus. Based on linear matrix inequalities and numerical optimization, a design method is provided of faster distributed inference systems.
Visualization Spectrometer Based on Refit Xilinx FPGA
Authors: Huang Xin Hua , Liu Hui Wen , Ye Lv Su
Published: September 2013

The spectrometer is a basic tool of optical measurement, having a wide application field. Because of its small visual range and used in a dark environment, traditional spectrometer cause eye fatigue, inconvenient in reading figure and its utilization rate is low. In order to solve these problems, I utilize Xilinx FPGA and CCD to retrofit the traditional spectrometer. Making the image which in the eyepiece shown on the displayer, realize the goal of Digital Angle measurement. The new design spectrometer has the advantage of operate simply, convenient maintenance, etc.
Immune Algorithm for the Singular Sample of Near Infrared Spectroscopy
Authors: Yu Fan , Li Ji Xin
Published: September 2013

This paper proposes a method to identify the singular sample with near infrared spectroscopy based on immune algorithm. T The immune algorithm and genetic algorithm for the same NIR spectral data sets are singular sample identification and comparison of the two methods. Remove the singular sample, immune algorithm is better than the genetic algorithm are used to PRESS of PLS model of water, fat, the protein increased by 25.8%, 32.1%, 21.7%.Experiments show that, artificial immune algorithm is not only suitable for near infrared spectra of singular sample, but also can improve the model prediction accuracy and robustness.
Experiment Research on Control Algorithm of ESP System
Authors: Liu Xi , Xiong Lu , Yu Zhuo Ping , Yang Peng Fei
Published: September 2013

In this paper a sliding mode controller was designed to calculate the target yaw moment for model tracking control and a fuzzy controller was used to real-timely determine the activation of the algorithm, which ensures the robustness of the control system, while avoiding chattering and undesired intervention of ESP at the same time. After testing the control algorithm on the HIL test bench in double-lane change condition, a comparison was made between the trajectories and handling stability of vehicles with the control algorithm and those without. The simulation and experimental results demonstrate that the designed control algorithm can effectively improve the stability of the vehicle.
Implementation of QPSK Modulation and Demodulation of FPGA
Authors: Zhu Jin , Yan Dan Dan
Published: September 2013

This paper studies the realization method of QPSK modulation and demodulation circuit based on FPGA.And the simulation results are given under the environment of MAX+PLUSII .In this paper, the scheme uses phase selection method, compared with the modulation and demodulation method commonly used, design more simple, more suitable for FPGA implementation, the reliability of the system is higher.Through the analysis of the simulation waveform shows, the very good realization of the QPSK modulation and demodulation function.
Particularities of Upper Limb Movements of Healthy and Pathologic Subjects
Authors: Toth-Taşcău Mirela , Bălănean Flavia , Stoia Dan Ioan
Published: September 2013

The paper presents a comparative study of the kinematic parameters of the upper limbs of one healthy subject and one patient with lateral distal humerus implant. This study aims to identify the movement patterns of the upper limb joints, having a particular interest in elbow joint, due to the patients pathology. Both subjects have been recorded in identical conditions, performing the same exercise what simulates one of the common daily activities.
The kinematic parameters which have been analyzed were flexion-extension and abduction-adduction in shoulder joint and flexion-extension of the elbow joint. The joint angles have been averaged per each valid trial and exercise. The comparison of the joint angle variation was performed in terms of normalized time. Standard deviation was computed to evaluate the variability of joint angles. Movement symmetry between left and right arms was evaluated by computing the p-values of the averaged series.
Physical Instability and Functional Uncertainties of the Dynamic Systems in Resonance
Authors: Bratu Polidor
Published: September 2013

Depending on the type of systems,the resonance statesare either short and without inducing structural changes, or lead to forced variations of the elasticity and damping parameters with the additional energy absorption. For the material physical systems, that simulate the dynamic behavior of equipments, industrial plants and constructions,the operation in resonance mode is unstablebeing characterized by pulse variations in the band-pass. In this case, the necessary energy input, from outside, when the operation state is maintained within the band-pass, inevitably leads to the modification of the elastic and damping parameters and to structural degradation processes appearance. Thus the resonance band, Δω, considered as a significant parameter of the excitation, as well as the specific relaxation duration considered as an intrinsic system parameter are in a functional correlation of the dynamic system. When the dissipation increases Δc > 0, the relaxation duration drops with Δt=m/Δc, in such a way that the relation Δω Δt = 1 is valid, similar to the Heisenberg indeterminacy formula for subatomic particles. It can be observed that for Δt tending to 0 and for very high values of Δc the resonance state can be achieved for any value of the excitation pulsation as a discrete variable parameter by the modification of the viscous component. In the ideal case, the resonance interval is reduced to a single value that corresponds to its own pulsation. The systems dynamic behavior generated by periodic functions resulting in either forced vibrations or wave propagation processes in viscoelastic media is characterized bydoubtful operation and physical instabilitywithin resonance.
Rolling Element Bearings Fault Identification in Rotating Machines, Existing Methods of Vibration Signal Processing Techniques and Practical Considerations
Authors: Zuber Ninoslav , Cvetkovic Dragan
Published: September 2013

This paper addresses the suitability of vibration monitoring and analysis techniques to detect different types of defects in roller element bearings. Processing techniques are demonstrated on signals acquired from the test rig with defective bearings. As a result it is shown that there is no reliable universal method for bearing failure monitoring from its early occurence up to bearings failure. Two real life case studies with different types of bearing failures are presented with practical considerations on methods used for failure identification.
Energy and Economic Analysis of Different Buildings Constructed with Environmentally Sustainable and Traditional Materials
Authors: Franzitta V. , Viola Alessia , Trapanese Marco
Published: September 2013

The use of bioclimatic principles can reduce energy demands and CO2emissions in the building sector. Costs are one of the most important barriers to a widespread adoption of the green architecture e.[ The aim of this study is to compare the energy and economic performances of two buildings: a real residential bioclimatic building located in Cinisi (a small town near Palermo, Sicily) and an imaginary residential building supposed having the same geographical location, cubature, shape and orientation as the bioclimatic building but built by conventional building materials. The tools used for this study were TRNSYS and HOMER[
Structural and Optical Properties of Ti1-x Fex O2 Nanoparticles
Authors: Alkhtaby Lila A.
Published: September 2013

We have synthesized the Ti1-xFexO2(x=0.01, 0.02, 0.03 and 0.05) nanoparticles by the sol gel method to enhance the photocatalyic property of TiO2.These samples are characterized using x-ray diffraction (XRD), Raman spectroscopy, Ultraviolet /Visible (UV/V) spectroscopy and fluorescence spectroscopy (PL). The x-ray diffraction patterns show that all the sample are formed in single phase with a complete solubility of Fe ions in the TiO2matrix. TiO2nanoparticles are tetragonal with anatase structure belong to the space group D41h9(141)/amdRaman active modes appear at 150, 196, 396, 483, 516 and 637cm-1. UV/V spectra show a decrease in the band gap with the increase in Fe concentration from 3.26 eV (1% Fe concentration) to3.11 eV (5% Fe concentration).
Modern Motion Control Systems-State of the Art, Challenges and Industrial Applications
Authors: Baimel Dmitry , Tapuchi Saad
Published: September 2013

The paper presents a technological review of modern motion control systems. Existing solutions are discussed and analyzed based on their topologies, limitations, and control techniques. A special attention is given to the servo control and variable frequency control systems, their comparison and applications. The paper also presents future trends in motion control systems.
Passive Angle-Only Maneuvering Target Tracking Using Federated Filter in Hybrid Coordinates
Authors: Fong Li Wei , Chen I Heng
Published: September 2013

An approach to federated filtering in hybrid coordinates is presented for a maneuvering target tracking through a multi-passive-sensor system. This new design accommodates a group of extended Kalman filters that the sensor-dedicated local processors process angle-only measurements extracted from a number of associated maneuverable aircrafts with onboard direction finders. Each filter utilizes the Reference Cartesian Coordinate (RCC) system for state and state covariance extrapolation and utilizes the modified spherical coordinate system for state and state covariance updating. In addition, a discrete-time state equation with the piecewise constant white target acceleration model is introduced into the RCC system for federated filtering. A weighted least squares estimator is used for the global processor aggregating the local estimates to generate a global estimate in the local inertial Cartesian coordinate system. Simulation results show that proposed approach drastically improves the tracking accuracy.
Design and Implementation of Fuzzy PID Controller for Brushless DC Motor Control System
Authors: Fan Wei , Chen Tao
Published: September 2013

This paper presents a robust fuzzy proportional-integral-derivative (PID) controller for brushless DC motor (BLDCM) control system. The hardware circuit of the BLDCM control system is designed and implemented using a digital signal processor (DSP) TMS320LF2407A and a monolithic BLDCM controller MC33035 as the core. Furthermore, a fuzzy PID controller, which combines the advantages of good robustness of fuzzy controller and high precision of conventional PID controller, is employed in the hardware system, thereby yielding a digital, intelligent BLDCM control system. Experimental results have shown that the control system can run steadily and control accurately, and have convincingly demonstrated the usefulness of the proposed fuzzy PID controller in BLDCM control system.
Smith-ADRC for Main Steam Pressure of CFBB
Authors: Fu Xi Liang
Published: September 2013

The main steam pressure control is one of the most important parts in Circulating Fluidized Bed Boiler (CFBB) control system. However, it is difficult to design controller because the combustion system of CFBB is an object that has many features: distributed parameters, nonlinear, time-varying and long time-delay. Therefore, in this paper, Smith-Active Disturbance Rejection Control (ADRC) is proposed and simulation results demonstrate the Smith-ADRC is effective in main steam pressure control.
Baffle Positioning System for Thomson Scattering Diagnostic on EAST
Authors: Sun Teng Fei , Zang Qing , Hu Qing Sheng , Han Xiao Feng , Wang Teng Fei , Shao Chun Qiang , Chen Hui , Yang Jian Hua , Hu Ai Lan , Li Ya Dong
Published: September 2013

A baffle positioning system has been designed to align collecting optical fibers and measure the spatial point corresponding to each fiber. In order to control field devices in both remote and local mode, two HMIs were designed with configuration software. One is for an Industrial PC in our laboratory and the other one for a portable industrial tablet deployed in EAST hall. The critical baffle mechanical actuator as well as its manual operation component was specially designed with a careful consideration of structural features of EAST device. Based on an Omron PLC, this system also provides a convenient control over several pneumatic valves and laser-spot watching lights, which are closely related to the preparation work before positioning. The trial running result shows this baffle positioning system can work stably and safely, reduce positioning time largely and bring much convenience to operator. It also has a great capability of integrating with more devices in the future.
Application of Dispersibility Mechanism for the Dispersibility of ZrB2 Powder Materials in the Liquor
Authors: Song Jie Guang , Wang Xiu Qin , Xu Ming Han , Li Shi Bin , Ji Gang Chang
Published: September 2013

With the fast development of preparing technology of new materials, the solving method of conglobation and decentralization problem of superfine powders already is key technology for preparing and developing new high-performance materials. Through investigating the dispersibility mechanism of particles in the liquor, the dispersibility mechanism is applied for the dispersibility of ZrB2 particles with the sedimentation method. When pH is 9, the dispersibility of ZrB2 particles is the best than that of other pH, the dispersibility of ZrB2 particles using dispersant in the ZrB2 suspension is better than that of using pure deionized water, the dispersibility of ZrB2 particles adding polymethacrylic acid ammonium in the ZrB2 suspension is the best than other conditions.
Enhanced Diamond Nucleation by Surface Texturing of Si Substrate in SF6/O2 Plasmas
Authors: Park Jong Cheon , Jeong Ok Geun , Kim Sang Youn , Kim Tae Gyu , Kim Jin Kon , Cho Hyun
Published: September 2013

SF6/O2 plasma surface texturing was employed to pretreat Si substrate for achieving enhanced diamond nucleation density. Surface roughness of the textured Si was found to be strongly dependent on the process pressure and normalized roughness values in the range of 2-16 were obtained. Remarkably enhanced nucleation densities of ~1010 cm-2 compared to conventional mechanical abrasion were obtained after seeding for the surface textured Si substrates. Raman spectroscopy revealed that ultrananocrystalline diamond films with grain size below 10 nm were grown on the surface textured Si.
Dynamic Preisach Hysteresis Model for Magnetostrictive Materials for Energy Application
Authors: Rocca G. La , Franzitta V. , Viola Alessia , Trapanese Marco
Published: September 2013

In this paper the magnetostrictive material considered is Terfenol-D. Its hysteresis is modeled by applying the DPM whose identification procedure is performed by using a neural network procedure previously publised [. The neural network used is a multiplayer perceptron trained with the Levenberg-Marquadt training algorithm. This allows to obtain the Preisach distribution function, without any special conditioning of the measured data, owing to the filtering capabilities of the neural network interpolators. The model is able to reconstruct both the magnetization relation and the Field-strain relation. The model is validated through comparison and prediction of data collected from a typical Terfenol-D transducer.
Grinding Force and Surface Roughness in Ultrasonic Assisted Grinding of SiC Ceramics with Diamond Grinding Wheel
Authors: Liu Li Fei , Zhang Fei Hu , Li Chun Hui , Chen Jiang , Liu Min Hui
Published: September 2013

In this paper, experiments are conducted to study the characters of Ultrasonic Assisted Grinding (UAG) and Conventional Grinding (CG), diamond grinding wheel is used in experiments, grinding forces and surface roughness are measured in both UAG and CG. The effects of different parameters on grinding force, surface roughness and force ratio are discussed. The results show that the grinding force and surface roughness in UAG is smaller than those in CG. The force ratio in UAG is lower than that in CG, which reveals that the grinding wheel has a good wear-resistant property in UAG process.
Study on Chemical Mechanical Polishing Parameters of 6H-SiC Crystal Substrate Based on Diamond Abrasive
Authors: Su Jian Xiu , Zhang Zhu Qing , Yao Jian Guo , Ma Li Jie , Feng Qi Gao
Published: September 2013

In this paper, according to the slurry ingredients obtained by former research, the influences of the chemical mechanical polishing (CMP) process parameters, such as the rotational velocity of the platen and the carrier, the polishing pressure and the abrasive size on the material removal rate (MRR) and surface roughness Ra have been studied in CMP SiC crystal substrate (0001) C and (0001) Si surface based on the diamond abrasive. The research results show that the material removal rate changes with the change of the abrasive size, the rotational velocity of the platen and the polishing pressure significantly, but the maximum of MRR can be obtained at a certain rotational velocity of platen, abrasive size and polishing pressure. The influence of the abrasive size, the platen velocity, the carrier velocity and the polishing pressure on surface roughness is no significant. Under the same conditions, the MRR of CMP the Si surface is larger than that of the C surface. This study results will provide the reference for optimizing the process parameters and researching the material removal mechanism in CMP SiC crystal substrate.
Fundamental Machining Characteristics of Ultrasonic Assisted Turning of Titanium Alloy Ti-6Al-4V
Authors: Wu Yong Bo , Niu Jing Ti , Fujimoto M. , Nomura Mitsuyoshi
Published: September 2013

In this paper, a new machining method is proposed for the high efficiency turning of titanium alloy Ti-6Al-4V in which the cutting tool is ultrasonically vibrated. An experimental setup is constructed by installing an ultrasonic cutting unit onto a NC lathe followed by experimental investigations on the fundamental machining characteristics. The results obtained in the current work showed that (1) the cutting force decreases with the increase in the power supplying level (i.e., the ultrasonic vibration (UV) amplitude), e.g., the cutting force components in X-. Y-and Z-directions were decreased by 48%, 45% and 87%, respectively, once the UV has been applied to the tool at the power supplying level of 50%; (2) the cutting marks with knit pattern are formed on work-surface with UV while the parallel distributed cutting marks are generated without UV, and the surface roughness is decreased by up to 10% when the UV is applied at an appropriate power supplying level; (3) the work-surface straightness is improved by 46% once the UV is applied.
Effect of Ultrasonic EDM on Machinability of Coarse PCD
Authors: Iwai Manabu , Ninomiya Shinichi , Zhou Zhi Rong , Suzuki Kiyoshi
Published: September 2013

For a purpose to improve electric discharge machinability of PCD composed of coarse (25μm) diamond particles, which has been thought to be extremely difficult to EDM, in this study, a method (US-EDM) to give an ultrasonic vibration to an electrode in axial direction, flexural direction and complex direction that couples axial and flexural directions was attempted. As a result, it was found that EDM efficiency could be improved to 6 times higher (0.065mm3/min) than a standard efficiency (0.011mm3/min) obtained in machining conventional PCD (C-PCD) and the electrode wear could be reduced to 1/2 by giving vibrations to the electrode in axial direction (frequency f=28kHz, amplitude δ=18μm). Further, this method (US-EDM) was applied also to a new PCD (EC-PCD) composed of electrically conductive diamond particles. As a result, it was made clear that EDM efficiency could be improved to 0.22mm3/min. This value is equivalent to approximately 5 times higher efficiency obtained in the machining of ordinary die steel and cemented carbide materials.
A Study on Erosion Performance of Monocrystalline Silicon in Ultrasonic Vibration-Assisted Abrasive Water Jet Machining
Authors: Zhang Zhong Wei , Zhu Hong Tao , Huang Chuan Zhen , Wang Jun , Yao Peng , Liu Zeng Wen
Published: September 2013

Ultrasonic vibration-assisted machining (UVAM) is an effective and promising technology for processing hard and brittle materials, it has been explored in many experimental and theoretical investigations. In this paper, a study on the erosion performance of monocrystalline silicon with UVAM is presented and discussed. In the erosion experiments, monocrystalline silicon wafers were eroded by the abrasive water jet machine assisted with an ultrasonic vibration system. A contrast experiment was carried out firstly to study the influence of the ultrasonic vibration, and then an orthogonal experiment investigation was carried out to understand the effect of process variables (the abrasive particle diameter, jet impact angle, standoff distance, abrasive mass flow rate and ultrasonic vibration power) on the depth of erosion and material removal rate (MRR). The experimental results revealed that ultrasonic vibration-assisted abrasive water jet erosion (UVA-AWJE) can obviously improve the depth of the erosion and MRR compared with those in traditional AWJE and the variation trends of the effect of the abrasive particle diameter, jet impact angle, standoff distance and abrasive mass flow rate on the erosion performance in UVA-AWJE are very similar to those effect in the traditional AWJ machining.
Experimental Study on a New Combination Processing Technology of Polycrystalline Diamond
Authors: Cui Z.M. , Han Y.G. , Kong J.P. , Chen Q.Q.
Published: September 2013

Polycrystalline diamond compacts (PCD) has high hardness, good anti abrasion property. The precision processing technology of PCD is key technology in applications. This article introduces a new combination machining method of polycrystalline diamond (PCD). This machining method combines diffusion machining with free abrasive milling. In the processing polycrystalline diamonds in PCD were removed by the diffusing; binders in PCD were removed by grinding. The two main factors in the processing were described. The results of the experiment indicate that grinding speed, abrasives particle - size are factors of the significant impact.
Heat Pipe Grinding Wheel in Grinding Titanium Alloy Ti-6Al-4V
Authors: He Qing Shan , Fu Yu Can , Chen Jia Jia , Zhang Wei
Published: September 2013

Heat pipe grinding wheel (HPGW) is a new grinding wheel which can improves heat transfer enhancement with the contact zone by means of the heat pipe technology. In this paper, the heat transfer principle and making process about heat pipe grinding wheel is illustrated. After then, grinding experiments with HPGW were carried out to verify the effect of heat transfer in the grinding titanium alloy Ti-6Al-4V. Results showed that using HPGW could significantly reduce grinding temperature and prevent the burnout in the grinding.
Research on Hole-Making Tools for CFRP
Authors: Zhang Hong Zhou , Wei Ying Ying , Yuan Yi Chu , Jiang Hong Yu
Published: September 2013

There are lots of defects in the drilling process of CFRP, such as splitting, etc, which may affect the assembly quality of the composite materials. Through the analysis of the drilling mechanism of CFRP, and with the help of the correlation experiments of drilling tools, the effects of machining parameters and machining tools on hole quality are studied, the optimal selection method of the drilling tools for CFRP and the selection principle of technical parameters under different machining conditions are also discussed. And the tools geometry affects the hole-machining quality of CFRP materials directly, which should be chosen in accordance with the hole-machining method.
Effect of Low-Frequency Pulsed Magnetic Treatment on Micro-Hardness of High Speed Steel
Authors: Ma Li Ping , Liang Zhi Qiang , Wang Xi Bin , Zhao Wen Xiang , Zhou Tian Feng , Yao Hong Min
Published: September 2013

The effect of low-frequency pulsed magnetic treatment on micro-hardness of W9Mo3Cr4V(W9) high speed steel (HSS) has been investigated. A low-frequency pulsed magnetic treatment system was designed and applied to treat the tool material. Experiments were conducted at different magnetic field intensities and pulse frequencies. Experimental results show that the low-frequency pulsed magnetic treatment can effectively increase the micro-hardness of W9 HSS in a proper treatment parameters. The micro-hardness change rate first increase and then stabilize as the magnetic field intensity increases. Pulse frequency has little effect on the treatment effect.
Research of Micro-Abrasive Suspension Jet Erosion Morphology and Material Removal Mechanism
Authors: Luo Zhuo , Wang Cheng Yong , Wang Rong Juan
Published: September 2013

This paper introduces the micro-abrasive suspension jet polishing technology in precision machining technology. In order to understand the micro-abrasive suspension jet erosion morphology and material removal mechanism, the erosion experiments of micro-abrasive suspension jet on 40CrMnMo7 special steel work-piece were taken. We found that when the incident angles are 90°, 60°, 30°, the polishing area is respectively annular shape, horseshoe shape and blade shape. During the erosion process, as the incident angle becomes smaller, most amounts of abrasive particles impact angles will also be small, and these cause more material removal. When the particles impact the work-piece with small angles, most particles play shearing action on the work-piece and leave the work-piece nanoscale scratches; while the particles impact the work-piece at large angles, extrusion and blow are formed by the majority of the particles on the work-piece, leaving different small size pits.
Pull-in Voltage Analysis of Carbon Nanotube Based Electrostatic Actuators by Using the ANSYS Software
Authors: Sankar P.A. Gowri , Udhayakumar K.
Published: September 2013

This Paper presents the design and simulation of single walled carbon nanotube (SWCNT) based cantilever type electrostatic actuator using finite element analysis method (FEM). The pull-in voltage has been calculated for various chirality of the nanotube based cantilever beam actuators. The pull-in voltage are obtained for the various gap between electrode and ground of the cantilever beam through extensive simulations using ANSYS software. The results obtained shows that pull-in voltages varies from 2.5 to 13.5V with respect to nanotube chirality and gap length.
Nonlinear Optical Studies of SWCNT+Coproporphyrin III Hybrid Systems
Authors: Kislyakov Ivan M. , Arutyunyan Natalia R. , Obraztsova Elena D. , Sheiko Ivan S. , Povarov Svyatoslav A. , Venediktova Anastasia V. , Yelleswarapu Chandra S.
Published: September 2013

We report nonlinear optical properties of hybrid systems that contain single-walled carbon nanotubes and Coproporphyrin dye suspensions. The studies were performed in Vis-NIR spectral range. Our results depict both bleaching and limiting properties. A phenomenon of optical power limiting synergism is demonstrated.
Operating Mode Analysis on Paratactic Structure Hybrid Excitation Synchronous Generators for Wind Power Generation
Authors: Zhao Chao Hui , Sun Jian Long , Li Jin Cai , Hu Xin
Published: September 2013

In order to deal with the difficulty of magnetic field adjustment in permanent magnet synchronous machines, this paper proposed a novel paratactic structure hybrid excitation synchronous generator (HESG) and presented the basic configuration and its principle. Then, with the analysis of armature reactions, it introduced the detailed working performances of permanent magnet synchronous generator (PMSG) and the electric excitation synchronous generator (EESG) in HESGunder different field current conditions. We can classify the operating modes of HESGinto three categories: double-generation mode, single-generation mode and generation-motor mode whose boundaries were deduced. Finally, the experimental results proved the correctness of those analyses.
Analysis of Two Surfaces under Viscoelastic Contact
Authors: Mongkolwongrojn M. , Panichakorn J. , Supawanich S. , Chutima S.
Published: September 2013

This paper presents the analysis of the contact surfaces between a rigid cylinder and a soft plate for viscoelastic material. The contact pressure and deformation of the plate in contact region were determined using finite element technique. Moreover, the characteristics of two surfaces of cylindrical roller and plate under elastohydrodynamic lubrication with nonNewtonian fluid were examined using finite difference technique with full adaptive multigrid method . In this study the simulation of viscoelastic material in contact was under taken to determine the effects of material behaviors on the deformation of plate compared to the elastic materials. The results indicated that the deformation shapes were nonlinearly dependent with the applied loads. Furthermore, the deformation of elastic material would reach a certain value in a period of time whereas the deformation of viscoelastic material was increased inconsistently with time. The film pressure and film thickness profiles in the contact regime were investigated at various loads. The minimum film thickness occurs near the trailing edge of contact region and becomes very small under heavy loads.