bluuebunny/crossref_metadata_2025 huggingface dataset:
Effect of Argon Ambient Gas Pressure on Plume Expansion Dynamics
Authors: Hamadi Farida , Amara El Hachemi
Published: April 2011

In this paper we present a numerical modeling of a nanosecond laser pulse interaction with a titanium target. We investigate the vapor plume formation and the influence of the ambient gas pressure on plume expansion dynamics. The vapor plume formation depends on the results of the heat transfer in the solid target modeling. The solid-liquid phase change is modeled by a two dimensional approach using an enthalpy formulation. The resulting plume expansion in the argon background gas is studied using the species transport model. The algebraic equations are discretized by the finite volume method implemented by Fluent CFD software [1]. The calculation results of plume expansion velocity, density, temperature and degree of ionization in the plume are presented.
Numerical Modeling of an End-Hall Ion Source
Authors: Oudini Noureddine , Hagelaar Gerjan , Garrigues Laurent , Bouef Jean Pierre
Published: April 2011

In an End-Hall source an ion-beam is extracted from a magnetized plasma and accelerated by the plasma electric field without grids. The ion beam of End-Hall sources is not space charge limited and ion current as large as 5 A at relatively low energy (100 V) can be achieved. These properties are very interesting for surface processing applications and thin film technology. Although End-Hall sources are commonly used for these applications, the physics of these sources is only poorly understood and a quantitative and predictive model of their regime of operation is still missing. The two-dimensional self-consistent model of Hall effect thrusters described in Ref. [1] has been adapted to End Hall sources and is used in this paper to describe the principles and main characteristics of these sources.
Influence of Plasma Parameters and Circuit Connecting on Harmonics Generated in Ar/O2 13.56 Mhz Plasma Discharge
Authors: Tadjine Rabah , Lahmar Hadj , Alim Mohamed Mounis
Published: April 2011

A non invasive ex-situ harmonic probe technique was used to characterize the plasma-generated harmonics of Ar/O2 plasma. To extract the harmonics, we used an iterative least-squares curve fitting algorithm and taking into account the presence of parasitic electrical elements. This study reports the influence of the process parameters on the harmonic response (from 2nd to 7th) to reveal the most sensitive electrical measurements that represent faithfully the evolution of the plasma. The electrical response of the matching network and the electrical model circuit chamber was taken into account.
Diagnostic of a RF (13.56MHz) Magnetron in Ar/CH4 Discharge
Authors: Djerourou Samira , Saoula Nadia , Henda Karim
Published: April 2011

This work presents an electrical and optical emission diagnostics of radiofrequency (RF) magnetron discharge used for titanium deposition in argon (Ar) and methane (CH4) gas precursor. The plasma was produced in incident power and gas pressure ranges of 20-300W and 15-100mTorr, respectively. We have studied the influence of the system operation parameters (incident power, pressure, proportion of gas precursor) on the self- bias voltage (Vdc) and emission intensity IAr of Ar (750.3nm) line. The results obtained show that the pressure of the optimum operation of the magnetron discharge was around 30 mTorr when the incident power varied from 20 to 300W. The relationship between the intensity of IAr (750.3nm) line and the incident power was established.
Angular Distribution and Ion Time of Flight Produced on Silicon Target by Laser Irradiation
Authors: Belaroussi Yasmina , Kerdja Tahar , Malek Smail
Published: April 2011

The growth of thin films by laser ablation involves very complex physical processes. The quality of the layer and stoechiometry of the deposits depend on key parameters like the ion energy and their angular distribution. The evolution of ions number and energy, and the angular distributions in regards to the incident laser energy, have been studied by the mean of a charges collector. We present the polar diagrams of energy and number of ions collected by irradiating a silicon target using an excimer laser at different energies.
Behavior of Cr-Rich Phase during Rapid Solidification Cu71Cr29 Alloys
Authors: Zhou Zhi Ming , Tang Li Wen , Luo Jing , Zhou Tao , Zhan Jie , Peng Cheng Yun , Xia Hua , Lei Bin Bin
Published: April 2011

Behavior of Cr-rich phase in rapid solidification Cu71Cr29 alloys was investigated by using melt spinning and splat quenching. The microstructure and solidification behavior of the Cr-rich were investigated by scanning electron microscopy (SEM). The results showed that the alloys generally have a microstructure consisting of a fine dispersion of a Cr-rich phase in a Cu-rich matrix. However, the morphology and size of the Cr-rich phase vary greatly with the cooling rate. On the one hand, the average size of the Cr-rich phase is reduced with increasing cooling rate. On the other hand, the Cr-rich phase show both dendrites and spheroids for lower cooling rate but only spheroids for the higher cooling rate. This means liquid phase separation occurred during rapid solidification. The results were discussed with respect to the formation of the Cr-rich spheroids during rapid solidification.
Numerical Calculation and Analysis of Mechanical Strength of Steel Wire Product
Authors: Wang Dao Ming , Hou You Fu , Meng Qing Rui
Published: April 2011

To obtain the influence law of laying combination and lay pitch multiple on mechanical strength of steel wire product, we took 6×19IWS right lang lay and right regular lay wire ropes as examples, combining with the strength theory, nonlinear finite element analysis were carried out with ANSYS software. The simulation results show the mechanical strength of the lang lay wire rope is better than that of the regular lay at the same lay pitch multiple; the lay pitch multiple of rope has a great impact on mechanical strength of steel wire product, however, the impact trend is similar among difference laying combinations, meanwhile the effect of the lay pitch multiple of strand is relatively small. Finally, finite element model for wire rope was verified reasonable through tensile experiment. Research results have important applications value for structural design and rational use of wire rope.
New Method Used to Prepare Paraffin Spheres Based on Digitalization of Microfluids Technology
Authors: Yang Mei , Hou Li Ya , Zhang Wei Yi
Published: April 2011

In tissue engineering, paraffin spheres are often used as porogen in solvent casting/particulate leaching technology to prepare scaffold. Shape, size of paraffin spheres is very important to connectivity of scaffold. Emulsification is commonly used to prepare paraffin spheres, in which the paraffin size can not be controlled well. In this paper, a new method based on digitalization of microfluids technology is used to produce paraffin spheres. In this method, relationship between drive voltage U and diameter of spheres, and relationship between diameter of nozzle d and diameter of spheres are studied. The two parameters have great effect on the shape, size of paraffin spheres. The shape, size of paraffin spheres can be adjusted by controlling the drive voltage U and diameter of nozzle d. The results show that the method based on digitalization of microfluids technology is simple, highly controllability.
Characteristics Analysis and Study for Area-Changing and Damp-Increasing Range Correction Device
Authors: Yang Fang , Hao Yong Ping
Published: April 2011

A new kind of correction system with damp-increasing area-changing was analyzed and proposed through analyzing researches of one-dimension trajectory correction at home and abroad. And carried out an analysis of the change and the influence that caused by drag coefficient, lift coefficient with angle-of-attack and wind speed under different area. The mathematical model was proposed between increased drag coefficient and variable area opened by the damper. Feasibility and rationality of the new system were verified by simulation analysis. Furthermore, the damper can open at the right place under the system requirements. By researching aerodynamic characteristics of the projectile fixed this device would promoted the further design of damp-increasing range correction system.
Low Temperature Anti-Cracking Performance of Brucite-Fiber-Reinforced Asphalt Concrete
Authors: Guan Bo Wen , Chen Shuan Fa , Xiong Rui
Published: April 2011

As a naturally occurring fibrous mineral abundant in China, it is not common to use the brucite fiber as the reinforcement in asphalt concrete to improve its anti-cracking property in low temperature until now. Laboratory experiments are made on the brucite fiber asphalt binder and the brucite fiber asphalt concrete in this paper. Effects of the dosage of the brucite fiber on anti-crack properties of asphalt binder and brucite fiber asphalt concrete in low temperature are also studied. The contrast test is made between brucite fiber, lignin fiber and basalt fiber. Test results show that the value of the ductility, the compliance in extension and the yield strain energy of asphalt binder decreases with the increasement of the dosage of brucite fiber. However, the temperature sensitivity property of asphalt binder in low temperature can be improved. The anti-crack properties especially the maximum bending stress and the maximum bending strain are improved by adding the proper quantity of brucite fiber in asphalt concrete. According to the test results, the optimum quantity of brucite fiber was about 0.4 wt.% of asphalt. Based on the contrast test, the brucite fiber is better than the lignin fiber on improving the anti-crack properties of the asphalt concrete, but which is similar to the basalt fiber.
The Study of Combination Model Forecasting of Dynamic Traffic Volumes Based on MATLAB
Authors: Sun Qian , Ding Wei Dong , Liu Han Li , Du Sheng Pin
Published: April 2011

The most important part of ITS (Intelligent Technology System) is the forecasting of dynamic traffic information reporting in a timely manner. Based on the results of past empirical studies, this article is presenting and analyzing two models based on Grey Theory and the BP (Back propagation) Neural Network. In accordance with the advantages and disadvantages of these two models, we established a new combination model. This article also presents the calculation of dynamic traffic stream volumes based on the application of two models (Grey Theory and BP Neutral Network).The results predicted an increase in the overall prediction accuracy of road traffic volume.
Simulation Research on the Influence of Oil Damping to the Effect of Assimilating Impulsion Based on Accumulator
Authors: Nie Qing , Nie Hong , Zhang Ming
Published: April 2011

The general function library and hydraulic control library of EASY5 software were used to establish the dynamic model of hydraulic system of a sudden load, which could assimilate impulsion based on accumulator. The system was simulated with different diameters of the oil supply hole of accumulator. The simulation results were compared and analyzed to research the influence of oil damping to the effect of assimilating impulsion based on accumulator. From the simulation results, a hydraulic circuit consists of a throttle valve controlled by pressure and an accumulator was put forward to improve the capacity of accumulator to assimilate impulsion by changing the oil damping of accumulator through throttle valve, which had certain of meaning in project.
A Quantitative Analysis of the Residual Stress and Grain Size Gradient Effects on the Energy Release Rate of a Coating-Substrate System
Authors: Yang Ban Quan , Li Fa Xin
Published: April 2011

The surface heat treatment can lead to the residual stress and inhomogenous effects in coating-substrate system. Based on the well-known Hall-Petch relationship between the coating yield strength and its grain size, the inhomogenous effect can be extended to the grain size gradient effect. In this work, a mechanical model of a coating-substrate specimen is developed to quantify the residual stress and grain size gradient effects on the energy release rate of the coating on its substrate. Using a Micro-Composite-Double-Cantilever Beam Model (MCDCBM), the analytic solutions can be derived, and they can be used to characterize the fracture toughness of the inhomogenous coatings on substrates in terms of the critical energy release rate. Finally, a numerical example is presented to show how the critical energy release rate is obtained.
Numerical Simulation and Process Optimization of the Die Forging for the Center Wedge of the Railway Freight Car Buffers
Authors: Zhang Yu , An Zhi Guo , Li Lu
Published: April 2011

Aiming at the center wedge of the railway freight car buffers, the forging process was analyzed and the die design was optimized. The direct finish-forging process after pre-forming process was contrasted with the finish-forging after pre-forging based on pre-forming process, and the influence of different billet sizes and die structures on the forming were analyzed and compared. To validate the different process scheme and die structure, the numerical simulations were done using FEM software deform3D. The results show that the filling capacity of billet to die cavity increases greatly by using direct finish-forging process and finish-forging die with the resistance wall and the utilization coefficient of materials is improved. This can reduce working procedure and improve the productivity.
Coupling Effect Analysis of 3D Interior Structural-Acoustic Problems Using Wave Based Method
Authors: You Cai Xia , Zhang Guang De
Published: April 2011

This paper describes the basic concept of the new technique for the modeling of the structural-acoustic coupling between the pressure field in an acoustic cavity with arbitrary shape and the out-of-plane displacement of a flat plate with arbitrary shape. It is illustrated through a three-dimensional validation example that the new prediction technique yields a high accuracy. The effect of the cavity depth and the coupling interface area on the strength of mutual coupling interaction are discussed in detail.
Finite Element Analysis on Mechanical Performance of CFRP Used in Masonry Structure Strengthening
Authors: Yang Zhao , Wu Wei Gang
Published: April 2011

CFRP is a new kind of building materials popularly used in structure strengthening. When CFRP is used to strengthen the masonry structures built by the traditional building materials-bricks and mortar, good reinforcing effect will be achieved. But there are still a lot of theoretical difficulties in CFRP’s application in structure strengthening. The paper studied the mechanical performance of CFRP strengthening the masonry structures by finite element analysis. Ansys is used in the paper to establish discrete models of brick walls strengthened by CFRP. In the models, mortar and blocks are given different material properties and simulated by contact elements and plane elements respectively. Through the comparison of the results of finite element calculation and experimental study, the mechanical performance of the walls is studied. The study shows that contact elements can simulate the mortar very well and the mechanical performance of the discrete models presented in the paper meets the actual masonry structure well too; in addition, the strengthening material-CFRP can improve the mechanical performance of the walls effectively.
Experiment Research on the Influence of Fretting on Crack Propagation
Authors: Yang Guang Xue , Li Qiang , Xie Ji Long
Published: April 2011

In order to investigate the influence of fretting induced by a shrink-fit shaft and hub subjected to rotating bending on crack propagation on different position, small specimens consisted of shaft and hub were tested on the four point rotating bending fatigue test machine. The experimental result shows that the fretting fatigue life of specimen with notch outside the shaft-hub contact is shortest, and the fretting fatigue life of specimen with notch inside the shaft-hub contact is longest.
Vibration Analysis of Diesel’s Undercarriage by Virtual Measure and Actual Measure
Authors: Liu Peng , Huang Ying Yun , Gao Hao Peng , Ou Da Sheng
Published: April 2011

This paper proposes to verify and test the vibration of diesel’s undercarriage got by virtual measure and actual measure through the analysis of time domain characteristics and amplitude frequency response characteristics of three-orientation vibrant speed of diesel’s undercarriage, represents the difference in time domain characteristics and amplitude frequency response characteristics got by virtual measure and actual measure, expounds the reasons of difference and puts forward a method to diminution the difference. It proves that virtual measure can replace actual measure in a way, though there are some difference in existence, we can erase these difference to the best of ours’ abilities through enough analysis.
Preparation and Electromagnetic Property of Hexagonal W-Type Ferrite Obtained by the Method of Coprecipitation with Flux
Authors: Xiong Zheng , Xi Zhu , Jun Zhang Li
Published: April 2011

Hexagonal W-type ferrite BaZn0.6Co1.4Fe16O27 was prepared by the method of coprecipitation with flux. The formation, microstructure, element composition and phases were analyzed by TG-DTA, SEM, EDS and XRD. The micrograph showed that the ferrite grains appeared to be hexagonal schistose texture obviously and the dimension of the grains was about 10μm. The product powders were composed mainly of BaZn0.6Co1.4Fe16O27 and few other phases such as α-Fe2O3, M-type ferrite (BaFe12O19) and S-type ferrite (MeFe2O4, Me for Zn or Co) were also found in the product. Electromagnetic parameters and microwave absorption capability were measured by the microwave vector network analyzer. The results showed that the reflection loss (RL) of the sample came up to -10dB in the spectrum from 8GHz to 18GHz and -20dB in the spectrum from 9.5GHz to 16GHz.
Electricity Control System of Semi-Automatic Figuration Machine of the Grind Material
Authors: Jia Yu Jing , Cheng Yuan Bo , Han Yan Yan
Published: April 2011

Firstly introduce compose structure of semi-automatic figuration machine of the grind material,and the motion it must be realized.Based on working demand of pneumatic actuator,analysing input and output signals of electricity control equipments,drawing a work process sketch map.According to the logic design method and step of electricity control circuitry,draw a logic relation chart.Reasonable dispose operation component work zone and write out operation component logic expression,then change the operation component logic expression to electricity control circuit diagram,finally point out the advantage of this design method.
Finite Element Analysis for Belt Conveyor's Drum
Authors: Wang Shang Bin , Zhang Xin Zhou , Wu Kai , Sun Yu
Published: April 2011

A new finite element analysis method of driver drum is introduced in this paper, conveyor belt is introduced in analysis model, and the effect that bearing imposed on drum is treated as spherical constraints. The drum is analyzed under the coalition of assembly load and ultimate torque load using the paper method as well as the traditional method, and the results between two methods are compared. The analysis results show that the danger points are on the hub inner and the weld seam between spoke and hub, the comparison shows that the analysis results by the paper described method are smaller than the traditional method results by 10%. The load imposing ways described in this paper are more consistent with the actual work process, and the analysis results are more accurate and reliable.
Robust Stability of Uncertain Switched Delay Systems with Nonlinear Perturbations
Authors: Xiang Chang Cheng , Liu Xiu , Ding Xiu Yong
Published: April 2011

This paper focuses on the stability problem of a class of uncertain switched delay systems with nonlinear perturbations. Applying multiple functional technique, we establish a delay dependent stability condition via designing appropriate switching rule. It should emphasize that this result is a standard extension of linear delay differential equations. Meanwhile, this result is presented by LMIs and thus solved easily.
Effect of Ammonia on Preparation of Ammonium Polyphosphate
Authors: Liu Gou Sheng , Duan Xian Zhi
Published: April 2011

Ammonium polyphosphate (APP) was prepared by process of diammonium hydrogen phosphate at different ammonia atmosphere. XRD techniques were used to characterize the crystalline form of this product. Results showed that ammonium had significant effect on the crystalline form of prepared ammonium polyphosphate. The results were informative for controllable preparation ammonium polyphosphate in industrial production.
Ammonium Polyphosphate Crystalline Transformation from Form II to Form V
Authors: Liu Gou Sheng , Duan Xian Zhi
Published: April 2011

Ammonium polyphosphate (APP) is an effective intumescent flame retardant, it has different crystalline forms and therefore, different application. The crystalline transformation from form II to form V was measured. The results were informative for controllable preparation ammonium polyphosphate in industrial production.
High-Rise Fire Escape Device’s Design and Analysis
Authors: Qian Bing Feng
Published: April 2011

For the current lack of convenient, reliable and safe lifting of the fire escape equipment, design a device along the rope, using functions with self-locking worm gear structure. Then assess the strength of the contact state and reliability of the structure, use ANSYS to analysis the contact stress and dynamic characteristics. Finally, improve the winch device design to increase the safety factor. The check calculation and experiments showed that the device can be safely hoisting the target.
Synthesis of LiFePO4/C Nanocomposite and its Electrochemical Properties
Authors: Lim Jin Sub , Choi Eun Seok , Kim Dong Han , Choi Choel Hoon , Kim Jae Kook
Published: April 2011

LiFePO4/C nanocomposite was synthesized by the polyol process without any further heating as a post step and its properties were compared to LiFePO4with no carbon. The X-ray diffraction patterns of all samples were indexed on the basis of the orthorhombic olivine-type structure. The field emission-SEM and TEM images of the nanocomposite showed agglomerated larger particles with rod type mixed with carbon nanoparticles. The initial discharge capacity of LiFePO4/C nanocomposite showed 166 mAh/g at a current density of 0.1 mA/cm2in the voltage range of 2.5-4.2 V without capacity fading during the 20 cycles. Furthermore, the nanocomposite appeared more enhanced high rate performance, compared with the result of LiFePO4with no carbon, due to the existence of conductive agents such as carbon which suppresses particle growth and exhibits improved electronic conductivity and lithium ion diffusivity, simultaneously.
Numerical Method on Drug Release from Nanoparticles Using CFD
Authors: Hussain Siti Aslina , Rosly Mohd Imran , Abdullah Norhafizah
Published: April 2011

Nowadays, there are many ways to administer the huge variety of drugs that are on the market. A drug is a chemical substance, that when applied to a living creature, alters its body function. Many drugs are used daily, such as caffeine in coffee and aspirin for pain. A route of drug administration in pharmacology and toxicology is the path by which a drug is brought into contact with the body. The most critical issue is some drugs are not significantly absorbed into the bloodstream. There are thousands of questions on the drug diffusion in the bloodstream and the most common issue is how long will these micro particles drug be released from the tablet? Thus, to identify the rate of the drug release and to control the drug release in our body is important, where to meet the target and not to become a waste. The Computational Fluid Dynamics method was used to investigate the drug design and diffusion profiles with time during the process of degradation and diffusion in water.
Social Network Analysis in Knowledge Management Research
Authors: Wu Bing , Ge Jun , Xu Wen Xia
Published: April 2011

This study is a productivity review on the literature gleaned from SSCI, SCIE databases concerning social network analysis in knowledge management research. The result indicates that the number of related literature is still growing especially in recent two years. The main research development country is the United States, then England and German, and from the analysis of the subject area, Information Science & Library Science is the most popular subject. Concerning source title, Knowledge Management Research & Practice is in the priority. Moreover the research focuses on this topic are mainly in close relationship with knowledge network. Typical references were analyzed in detail, including limitations and future research.
A Method for Designing OLED Unit Template-Based Customization Technology
Authors: Yao Yi Yong , Zhao Li Ping
Published: April 2011

Aiming at the hierarchical and modularization characteristics of OLED (Organic Light Emitting Display) unit, based on the analysis of electric, optics, and structure combination process of OLED unit template, the OLED unit customization and combination method based on template customization technology was proposed for the geometric features, process features and joint features of three-dimensional microstructures. Consequently, the typical OLED unit three-dimensional microstructure and OLED unit customization platform were constructed to provide an approach for the design and manufacturing of OLED unit.
The Stress Analysis of New Pressure Piping Model
Authors: Wang Bin , Liu Cai , Wu Xue Li , Qiao Xue  Fei
Published: April 2011

High-pressure becomes the high pressure unit design main consideration factor to compressive load capacity, security, efficiency, economic and manufacturing process of high-pressure equipment. This article proposes a new pressure piping according to the current high-voltage device development tendency and the future requirement. This new type of pressure pipe can be simplified for pipe casing model. Firstly we establish single, double and multilayer pressure piping model. We push out the multilayer pressure pipe stress formula according to stress situation of the analysis of the knowledge of mechanics of each model. We get this pressure piping withstand by the most intrinsic pressure enhance obviously under each layer within the radius of the cylinder reach the initial limitation of materials and other parameters of model are same through the comparison of the theoretical formula calculation with other general. Pressure pipeline calculated value. The multi-layer pressure piping system's circum radius are smaller than other piping with other pressure piping withstand the same most intrinsic pressure and the most interior radius are the same situation.
Preliminary Study on Application of Computer Color Matching Technique for Wood Dyeing
Authors: Liu Wei , Yu Zhi Ming , Li Wan Zhao
Published: April 2011

Wood dyeing requires a non-subjective, repeatable method for determining the color testing and matching. Previously published method used human visual perception to determine the percent of dyestuffs. In this study, computer color matching technique was applied into the dyeing of fast growing wood for the imitation of precious wood species. The process includes measuring the color of wood samples, determining dyeset, preparing and measuring basic color samples, establishing a basic database, calculating and correcting recipes. The recipe of black walnut provided by the system was as follows: acid yellow 2G 0.19%, acid green 0.59%, acid red B 0.29%, with the chromatic difference 0.12%. It could be concluded that dyeing with computer color matching technique allows for a faster, less subjective and easily repeatable procedure that is superior to simple human visual perception.
Synthesis a New Photochromic Diarylethene Based on Five-Membered Heterocycle and Hexatomic Ring Aryl for Optical Storage
Authors: Cui Shi Qiang , Pu Shou Zhi , Liu Gang , Liu Wei Jun
Published: April 2011

A new unsymmetrical photochromic diarylethene 1-[2-cyanophenyl]-2-[(2-methyl-5-(4- methoxyphenyl)-3-thienyl)]perfluorocyclopentene (1a) was synthesized, its photochromic properties were examined, the result indicated that the Diarylethene 1a changed the color from colorless to purple upon irradiation with 297 nm UV light, in which absorption maxima were observed at 550 and 557 nm in hexane and PMMA film, respectively. This new photochromic system also exhibited remarkable fluorescence switching in hexane solution and remarkable optical storage character in PMMA film.
Prediction of Resin Thermal Behavior during Curing Process Based on Kamal-Ryan Model
Authors: Tang Wen Xian , Zhang Jian , Ma Bao
Published: April 2011

This paper was devoted to the numerical simulation the resin curing process. Anisotropic conduction was considered in the model. And Kamal-Ryan model was used to describe the curing kinetics of the resin. The general purpose finite element code ABAQUS was used in conjunction with its user subroutine UMATHT to solve the heat conduction equation and the kinetic model, simultaneously. Then corresponding experiment was carried out to validate the model. Finally, rate-of-cure, temperature and state-of-cure were analyzed during the curing process.
Validity of Definition Assessments for Motion Blur Identification
Authors: Xiang Shou Bing , He Jin Ping , Su Guang Da
Published: April 2011

In this paper, based on the series of test images which are synthesized through the linear motion blur model with continue variable parameters, we define the sensitivity of image definition assessments. Experimental data are presented that the validity of definition assessments for motion blur identification closely relates to the sensitivity of definition assessments. The higher the sensitivity is, the better the validity of definition assessments for identification performs.
Tooth Profile Synthesis and Strength Computation of Swing Movable Teeth Drives
Authors: Liang Shang Ming , Fu Bo , Wang Dong Mei , Yin Guo Fu , Huang Bo
Published: April 2011

The tooth profile synthesis of swing movable teeth drives was performed. The tooth profile equation of the internal teeth ring was established. The analysis result shows the deformation distribution of the movable tooth in the normal direction at the contact point of the wave generator is a sine function. Furthermore, the forces of the wave generator, the movable tooth pin and the internal teeth ring acting on the movable tooth were analyzed. Based on the Hertz theory and material mechanics, the contact strength calculation methods for the meshing pairs of the movable tooth and the wave generator as well as the movable tooth and the internal teeth ring were discussed. The calculation method for the bending strength of the pin was also derived. The research result provides a theoretical basis for designing and applying swing movable teeth drives.
Research on Coherence Structure Construction for Chinese Text
Authors: Chen Yan Min , Lou Xi Zhong , Zhan Jing Wen , Wu Shan Qiang
Published: April 2011

This paper presents a coherence structure construction method based on discourse cue phrases for Chinese text. An algorithm that derives the coherence structure from classes of coherence relation is illustrated, and classes of coherence relation can be concluded empirically by cue phrases of discourse. The experiment result shows that the algorithm can find most of the important coherence structure. It is useful for text analysis.
Performance Analysis of Hydrostatic Slideways Systems with Different Types of Restrictors
Authors: Zhou Sheng Hao , Song Jin Chun , Zhang Zhi Wei , Li Song
Published: April 2011

In fluid hydrostatic closed-type slideways systems, restrictor will take an important role of improving the performance of machine tools. Generally there are four types of restrictors to be utilized, capillary type, orifice type, slot type, and dynamic feedback type. The general oil film stiffness model of different types of restrictors was constructed and the characteristics of different types of restrictors are analyzed and compared. The analysis results demonstrated that the stiffness of restrictors depend on the geometry and structure parameters, and according to the analysis results the all types of restrictors can be designed optimally.
Dynamic Adaptive Harmony Search Algorithm for Optimization
Authors: Wang Yi Wen , Yao Min
Published: April 2011

A new meta-heuristic optimization algorithm–harmony search is conceptualized using the musical improvisation process of searching for a perfect state of harmony. Although several variants and an increasing number of applications have appeared, one of its main difficulties is how to select suitable parameter values. In this paper, we proposed a novel algorithm to dynamically adapt the harmony memory consideration rate (HMCR) and pitch adjustment rate (PAR) and distance bandwidth (BW). The experimental results revealed the superiority of the proposed method to the original HS, improved harmony search (IHS) and global-best harmony search (GHS).
The Model of Reliability for a Repairable System
Authors: Xiao Xin , Li Jing Bo , Ma Li
Published: April 2011

In this paper we consider the system of M/M/N queue with service interrup-tions , therates of server breakdown are different between busy time and idle time, and thereis one repairman ite system. We give out the group of equations for the steady state distribution of the number of effective servers. We obtain the steady-state probabilities of the states and the steady-state availability of the system. This document
Design and Finite Element Analysis on Crown Gear Coupling of High Torque Considering Radial Restriction
Authors: Wang Ping , Zheng Zhi Jun , Zhang June
Published: April 2011

In order to meet the requirements of high torque and small center distance of the twin screw pulping extruder, an improved design method of the crown gear coupling (CGC) was studied. Based on the preliminary structural design, the paper selected parameters of tooth form of the crown gear firstly, and according to the contact strength solved the tooth width, then the discussed influences of radius of displacement circle and unilateral thinning amount on tooth thickness, finally through the finite element analysis verified the design results. The results show that under the condition of radial restriction the most effective ways to increase load-bearing capability of the CGC are to improve the tooth stiffness and increase the tooth width, and the increasing of tooth width should consider the tip strength of the crown gear and avoid over-cutting. The CGC design method of the paper can meet the requirements of the twin screw extruder.
Chord-Based Indexing Model to Support Complex Query and Load Balancing
Authors: Zhao Xiu Mei , Liu Fang Ai , Qin Song
Published: April 2011

This paper presents a new model (SMF-Chord) which is expanded from Chord. SMF-Chord uses double-fingerprint, double-mapping and dynamic forwarding mechanism to support multi-attribute multi-keyword fuzzy-matching query, and also has a load balancing mechanism which includes three parts: similar-close transposition, forward balancing and hot-set cache. The experiment results show SMF-Chord has high recall rate with low storage redundancy, and it can effectively balance load when node mapping load, file storage load, or query load is unbalanced.
Constructing Phylogenetic Tree Based on Three-Parameter Model
Authors: Guo Ping , Chen Gui Fang , Wang Yan Xia
Published: April 2011

Neighbor Joining Algorithm (Neighbor-Joining or NJ) is a common way to construct phylogenetic trees. To enhance the accuracy of constructing the phylogenetic trees, we use the Kimura three-parameter model to calculate the distance between sequences, raising a way to improve NJ. By computer simulation, we made a comparative analysis of the accuracy among the improved NJ, UPGMA, and the original NJ, the result showing that the improved NJ is superior to UPGMA and the original NJ. 
An Improved Control for Large-Scale Wireless Sensor Networks
Authors: Han Shuang Xia , Zhang Lu , Fang Jian Wen
Published: April 2011

A 3-layer topology is proposed to solve the problem of the incompatibility of the traditional topology structure in large-scale WSN. The data communication strategy for each level have been analysed, and an topology control algorithm for top-level is brought up based on the bottleneck-nodes, which will provide higher reliability control for the key-level. The experimental results indicated that, the new topology control strategy will contribute to balance the communication load of the nodes, and the energy consumption in the key-level reduce remarkably.
Framework to Evaluate Operational Effectiveness Based on Extended IDEF3 Method
Authors: Cheng Kai , Zhang Hong Jun , Wu Zhong Jun , Wu Guang Hua
Published: April 2011

Facing the complexity of military operational modeling and the difficulty of operational effectiveness evaluation, based on extended IDEF3, this paper proposes a framework to evaluate operational effectiveness. Bring forward the basic structure of this framework and extend the UOB’s attributes through introducing the combat action effectiveness. By the task decomposition and the "series-parallel connection" model framework aggregation, it can meet the needs of mapping the single combat action effectiveness to task-based operational effectiveness so as to assess the effectiveness of armies aiming at a specific task. Finally, take an air defense brigade performing air defense task for example to prove this framework used to evaluate the operational effectiveness is feasible.
Effect of Priming Techniques on Seed Germination Characteristics of C. Maxima Duch
Authors: Sun Yong Dong , Li Xin Zheng , Yang He Lian , Sun Li
Published: April 2011

The present study was conducted to investigate the effect of seed priming techniques on germination characteristics of C. maxima Duch. cultivar (Beiguan). Treatments were combinations of 3 levels of priming (distilled water, NaCl and PEG6000) and non-priming (control) with 3 replications. Concentrations of NaCl solution were 50, 100, 150, 200 mmol•L-1, and polyethylene glycol (PEG) 6000 were 10%, 20%, 30%, 40%, respectively. Seeds were primed using the above priming materials for 24 hours at 20°C in the dark, respectively. The results showed that different priming techniques could have various effects on germination of Beiguan seeds. Hydropriming (distilled water), NaCl priming and PEG6000 priming (10%) all improved the germination characteristics of Beiguan, compared to the control. NaCl priming was more effective than hydropriming and PEG6000 priming and was the most successful technique in this study. These findings indicated that seed priming techniques could accelerate germination process and were simple and cheap, we should propose these methods to farmers.
Research on Stratiﬁed Re-Sampling Particle Filter Target Tracking Algorithm Based on Multiple Clues
Authors: Cao Jie , Zeng Qing Hong
Published: April 2011

To further improve the performance of video object tracking and overcome the instability brought by using a single measurement source, a new particle filter algorithm was proposed which combined the color with contour information. The methord used color likelihood model to predict object, geometric active contour model to update the particle, and Stratified Re-sampling method to overcome the particle degradation. Experimental results show that the proposed algorithm is more robust than the traditional algorithm based on a single clue in occlusion, even though the color of the object is very similar to the background, it still tracks the target accurately.
Video Image Segmentation Using Gaussian Mixture Models Based on the Differential Evolution-Based Parameter Estimation
Authors: Zeng Zhi Gao , Ding Li Xin , Yi Sheng Qiu , Zeng San You , Qiu Zi Hua
Published: April 2011

In order to improve the accuracy of the image segmentation in video surveillance sequences and to overcome the limits of the traditional clustering algorithms that can not accurately model the image data sets which Contains noise data, the paper presents an automatic and accurate video image segmentation algorithm, according to the spatial properties, which uses the Gaussian mixture models to segment the image. But the expectation-maximization algorithm is very sensitive to initial values, and easy to fall into local optimums, so the paper presents a differential evolution-based parameters estimation for Gaussian mixture models. The experiment result shows that the segmentation accuracy has been improved greatly than by the traditional segmentation algorithms.
Diffusion Bonding of ZrO2 Ceramic and Cu-Pb Alloys
Authors: Pan Hou Hong , Zhang Da Xiang , Itoh Isao , Kawasaki Syuji
Published: April 2011

The effect of Pb in copper alloy on the diffusion bondability of copper alloy and ZrO2 ceramic was investigated. The diffusion bonding was carried out at 1173 K for 3.6, 7.2, 14.4 and 21.6 ks under the pressure of 2, 4, 6, 8 and 10 MPa in the vacuum of 1.3 Pa. Microstructure of the bonding interface and the shear fractured surface was researched by SEM and EPMA. The bonding strength was examined with the shear test. The addition of Pb shows the positive effect on the bondability of copper alloy and ZrO2 ceramic. In the joints of Cu-xPb (x=0, 0.5, 1, 2) alloy and ZrO2 ceramic, Pb at the bonding interface releases the thermal stress which was introduced at and near the bonding interface, and it results in the high shear strength of about 50 MPa. The combined addition of Pb and other elements (Ag, Mg, Zn, Al, Ti, Sn and Ni) was not effective on the bondability in all joints.
Framework for Building Web Sites with Microsoft’s .NET Technology
Authors: Wang Yan En , Chen Yao , Xing Xue
Published: April 2011

The author has designed a framework for building web sites using Microsoft’s .NET technology. The framework employs a design approach based upon the Model View Controller (MVC) design pattern. A framework in an object oriented system is a collection of classes that provide an abstract approach to solving a given problem.
The Method to Construct Elementary Dependent Function on Single Interval
Authors: Li Qiao Xing , Li Xing Sen
Published: April 2011

Extension theory are widely used in many fields such as automation, manufacturing process, operations management and artificial intelligence. Dependent function is the core of extension set. In this paper, we construct the elementary dependent function on the single interval, i.e., the discussion field is the same as the positive one, and it includes finite and infinite ones, respectively. Some properties are also discussed. The proposed functions allow extension theory with a broader scope.
Influence of Material Properties on Air Bending Based on RBF
Authors: Gao Ying , Liu Yu Zhong , Fan Li Feng , Li Qiang
Published: April 2011

Based on the plastic bending theory, the influence of material properties fluctuations of pipeline steel on the air bending is discussed by the computer simulation technology and design of the orthogonal was adopted to define scientific simulation experiment scheme. Among the material properties, initial yield strength is the most critical issue. The relation of the initial yield strength, the key process parameter, punch penetration, and the tube forming quality was studied and the variation of bending angle after springback and forming force with the punch insertion was analyzed. The parameters prediction model, which was established by using RBF network technology, is proved rational and precise since the error between predicting results and simulation value is very small. The method can be used to optimize the relevant process parameters and to design the reasonable process scheme.
Stress Distribution Model between Lunar Rover Wheel-Leg Foot and Lunar Soil
Authors: Wang Yong Ming , Fan Tong Hua , Yu Xiao Liu
Published: April 2011

Aiming at the sink problem of wheel-legged lunar rover with double-half-revolution mechanism when walking on the soft lunar surface, a foot mechanism is added at each end of the striding rods of the wheel-legs, in order to improve the contact property between wheel-leg foot and lunar soil. The foot mechanism is composed of a hemispherical lobed foot with friction holes and a rotational joint, and the lobed foot is connected with the striding rod through the rotational joint. Taking the mechanics properties of lunar soil into account, absorbing the present vehicle’s ground mechanics theory and related ground soil models, this paper established the stress distribution model of their interaction between wheel-leg foot and lunar soil, and then simplified the stress distribution model reasonably. By setting the parameters of foot mechanism and the properties of lunar soil, the stress distribution model was simulated and the relation curves about the driving force, subsidence amount, driving torque and load of the wheel-leg were obtained.
Reliability and Maintainability Model of Support Object System for Equipment Combat Unit
Authors: Chen Le , Shu Zheng Ping , Feng Hui Juan , Li Yuan
Published: April 2011

This paper took Support Object System as the research object. With defining the basic concepts just like combat unit, it constructed the three-dimension researching framework of RM modeling for support object system using System Engineering theory, from parameter, time domain and hierarchical these three aspects. It established the RM parameter system for the smallest combat unit -Basic Equipment Combat Unit’s support object system, with distinguishing the comprehensive and monomial parameters. Operational mission-oriented RM model of baisc equipment combat unit was established subsequently, with multiple modeling theories and methods, such as phased-mission system and reliability block diagram, etc. This model could provide the foundation for operational mission-oriented support resource deployment and support efficiency evaluation.
An FPT Algorithm for the Correlation Clustering Problem
Authors: Xin Xiao
Published: April 2011

Given an undirected graph G=(V, E) with real nonnegative weights and + or – labels on its edges, the correlation clustering problem is to partition the vertices of G into clusters to minimize the total weight of cut + edges and uncut – edges. This problem is APX-hard and has been intensively studied mainly from the viewpoint of polynomial time approximation algorithms. By way of contrast, a fixed-parameter tractable algorithm is presented that takes treewidth as the parameter, with a running time that is linear in the number of vertices of G.
Using Data Warehouse to Discover the Relation between TW-DRG and Pharmacology
Authors: Chen Chih Sheng , Chen Guan Yu , Hong Jing Wun , Jhang Ji Rou , Liou Jia Yi , Wu Syuan Zih
Published: April 2011

This research explores the relation between TW-DRG and pharmacological information by using the concept of data warehouse as a basis. It is hoped to assist doctors, under the condition that patients’ rights will not be affected, to replace the high-priced pharmaceuticals with the pharmaceuticals which are low-priced yet with the same pharmacological and pharmacodynamic effects, in order to reduce the medication cost in medical institutions and hospitals. From this result, we learn that the differences among doctors’ medication habits can be offered to hospitals and doctors for policy analysis on medication. Also, doctors can make appropriate adjustments in medication acts and find out the replaceable pharmaceuticals so that the pharmaceutical cost can be lowered.