bluuebunny/crossref_metadata_2025 huggingface dataset:
Subset Optimization of ACM Schemes Based on DVB-S2 Standard
Authors: Qi Ye Long , Yang Yu Hong
Published: September 2012

A rain fading mitigation technique, called Adaptive Coding and Modulation (ACM), is supported by the DVB-S2 standard. But the number of Coding and Modulation Schemes is over dimensioned. It is shown that by a careful selection of the ACM schemes, with one fourth of the total number of schemes, it is possible to get performance close to the optimum, but with a much lower terminal complexity.
Information Acquisition and Processing System Based on RFID
Authors: Yang Guang Hao , Li Meng Yuan , Tao Wei Wei , Chen Zhan Sheng
Published: September 2012

Paper, bar-code labels common in the market is unable to meet the needs of efficiency and information visualization on modern society. When identifying or checking the information of the device, the traditional method of recording information is too cumbersome. It will result in unnecessary waste and cannot guarantee the correct rate. To use RFID to record and query device information, it will significantly improve system efficiency and accuracy. Information management system based on RFID equipment consist of three parts, including electronic tags, mobile handsets, fixed background management system. Vendors of background management system can write information to the tag for uniform coding.
Design of the Web-Servers Monitoring System Based on ACE Framework
Authors: Wang Hua Xia , Zeng Xiu Pin , Deng Li Jun , Guo Yi Na
Published: September 2012

For low effectiveness and passiveness of current monitoring of domestic web-servers, this paper presents a design of web-server monitoring system based on ACE framework, which combines with government’s website approve , and gives a detailed statement of the design of the network transmission sub-system and the choice of non-blocking I/O model based on ACE framework.
A JBPM-Based Workflow Engine for Web Services Orchestration
Authors: Lu Fan Feng , Ying Shi , Zhao Kai , Zhang Li
Published: September 2012

A novel workflow engine for Web service orchestration, JBPM4WS is proposed in this paper. JBPM4WS is built on JBPM, a well-known workflow engine. We extend the workflow language JPDL, which is adopted by JBPM, to support service invoking. JBPM4WS engine adopts four-layer architecture, and is implemented based on some open-source frameworks, such as Hibernate, CXF and JAXB.
Study on Frost Resistance of Nano SiO2 Cement Concrete
Authors: Zhao Zheng Rong , Kong Jie , Yang Hong Xia
Published: September 2012

According the test, this paper discussed the relationships among nano SiO2content of nano SiO2cement concrete ,air content, water-cement ratio and frost resistance property.Meanwhile, the relationship among the bubble parameter, structure of holes and the frost resistance is primarily discussed. The results show that the concrete mixed with some nano SiO2, with the increase of impervious holes in hardened cement paste, compared with ordinary concrete,both the ability of freezing-thawing resisting and compression strength will have an improvement. What’s more, when mixed with the air-entraining agent, freezing-thawing cycles number will have an obvious increase.When water-cement ratio is 0.35-0.39, the ability of frost resisting is very high but when water-cement ratio is larger than 0.39, freezing-thawing resisting performance is substantial decline.
MVC Pattern Based on JAVA
Authors: Ding Yue Hua , Liu Chang Hua , Tang Yu Xin
Published: September 2012

With development of software scale, programmer has been noticed the importance of design pattern. Each pattern has different realization in different platform. As the object-oriented technique develops, application of MVC pattern has been widely used. MVC pattern doesn’t only used in component construction, but also it used in large-scale object-oriented system design, such as e-commerce system. This paper discusses application of MVC on JAVA platform, and analysis advantages and disadvantages of MVC and MVC2.
Self-Adjust Terrain LOD Rendering Based on GPU
Authors: Yu Wen Long , Zhang Li Min
Published: September 2012

This paper presents a kind of adaptive rendering algorithm based on the data structure of patch block. It adopts the Tessellation technology and index template technology .The terrain is rendered through the index template technology when it does not need high precision geometric characteristic. The paper presents the calculation model of subdivision coefficient based on the patch boundary and deals with the result of the calculation when the terrain needs high precision geometric characteristic. The result of the experiment indicates the algorithm can improve the rate of frame and the effect is more reality. The terrain of higher detail will be rendered when we input more rough grids.
Design of E-Commerce Platform Based on MDA
Authors: Ren Xiao Juan
Published: September 2012

How to deal with platform transferring and to improve the adaptability to changes in demand are two problems in E-Commerce applications. MDA technique is one of the most effective methods. The article discusses the core technology and the framework model of MDA. Finally, it takes the ordering system in E-commerce as an example to make a vivid presentation.
Analysis of Students Health Based on Association Rules
Authors: Wang Li , Li Ai Jing
Published: September 2012

Association rule mining is one of the most important techniques in data mining. According to the national standard of students’ health, the health condition of university student should be tested once every academic year. So a lot of testing data have been recorded in our university. This paper analyzes these data of freshman students by positive and negative association rules and finds lots interesting results. By analyzing these results, some suggestions are proposed to improve the students’ health condition, including targeted physical education teaching, establish a supervising system, and do exercises on own initiative.
Electric Energy Demand Forcasting with GRNN for Energy Saving Strategy
Authors: Zhao Lan Guang , Hou Jing , Pian Jin Xiang , Zhang Feng Zhong
Published: September 2012

In order to reasonable distribute electric energy and develop an energy-saving plan, electric energy demand forecasting which can represent a fundamental information is necessary. Power consumption has long duration, obvious nonlinear effect and the energy demand may be seen as a temporal series when its data are conveniently arranged. Neural networks have proved to be a very powerful tool which can predict a future value by studying the past one. In this paper, we propose a time series prediction model based on Generalized Regression Neural Network (GRNN) to predict the evolution of the monthly demand of electric consumption. GRNN is trained in just one presentation of the training patterns and is capable of providing fast and accurate results. The performance of the algorithm is evaluated using mean absolute and mean square errors. Tests are carried out by using the power consumption data of a campus distribution subsystem and the results obtained are found to be compatible with the actually data.
An Instruction Decoder for x86_64 Based on Specification Language
Authors: Wei Zhen Fang , Pang Jian Min , Zhang Yi Chi , Shan Zheng
Published: September 2012

With the development of computer architecture, new architecture cannot use the executable files on the old architecture and other architectures. In order to translate the x86_64 binary executable files to other architectures, we decode the binary files by a decoder generated by the New Jersey Machine-Code Toolkit through writing a specification of the x86_64 instructions. This paper give a brief introduce about the Specification Language for Encoding and Decoding and the x86_64 instructions characteristics, then make a detailed description on the specifications of the x86_64 instructions, and the result of the test proved that the decoder is correct and has high speed.
Application of DFG Model on SOPC Technology
Authors: Niu Wen Liang , Li Wen Zheng , Yin Kai Shuang
Published: September 2012

HW/SW (hardware/software) co-design method based on analysis and optimization of DFG (data flow graphic) model is introduced for SOPC (System on a Programmable Chip) used for digital instrument design in this paper. The method is based on the DFG model of the digital signal process algorithm and implemented with SOPC technology. The DFG model could help designer to divide the function into hardware and software respectively, therefore, the optimizing analysis at system level and circuit level of a SOPC used for portable logic analyzer shows that the DFG model is very useful for not only optimizing architecture and power consumption, but also HW/SW co-design.
Constitution of the Stationary Scene of the Traffic Testing Field of the Transportation Ministry
Authors: Zhang Zhen Hua , Chen Xue Mei , Gao Li
Published: September 2012

The paper gives the process of building the model of the Traffic Testing Field’s stationary scene which includes the acquisition and modifying of the texture, the building of the model and testing simulation. In the process, the model builder uses Geometry tool, Face tool, billboard tool and so on to build the model. Through testing and simulating, the model turns out to be a perfect simulation.
Research on Application of Airport Simulation System Based on 3D GIS
Authors: Tang Ke , Xu Jun Ku
Published: September 2012

Due to the characteristics of long period and complicated project, in order to display and manage the airport project in a comprehensive and visual way, it is imperative to establish an application system in 3D airport simulation in advance. This system is just based on this theory and developed by adopting 3DS MAX and Sketchup modeling tool and utilizing OpenGL 3D engine based on the development language Visual C++. The system realizes 3D informationized display and management of airport. The system is testified in necessity and intuitionism through practical examples.
Chemical Stability and Thermal Property of Hollow Hydroxyapatite Microspheres Fabricated by a Glass Immersion Process
Authors: Wang Ying Chun , Zhang Shi Xiong , Wang Mei Chun
Published: September 2012

In recent years there has been increasing interest concerning the synthesis of hollow materials in nanometer to micrometer dimensions. Hollow hydroxyapatite(HAP) microspheres with pores on their surfaces were prepared by a Li-Ca-B glass in situ immersion conversion process in an aqueous phosphate solution at 37°C. The chemical reaction ability of the Li-Ca-B glass was studied by immersing the glass in SBF solution, and the phases of the reaction product were identified by the XRD method. The morphology, composition, phases and thermal property of the hollow HAP microspheres were investigated using by chemical analysis, SEM ,and XRD . The microphere wall consisted of calcium deficient hydroxyapatite (CDHAP) crystals only. Furthermore, the formation mechanism of the hollow HAP microsphere was also discussed.
Research on Method of Credibility Evaluation of Simulation System Based on Mission
Authors: Su Xiang Ping , Lin Qi
Published: September 2012

With the scale of the simulation system is being bigger and bigger, and the complex is being higher and higher, the research on credibility evaluation becomes the hotspot in the modeling and simulation field. This paper is established in resolving the credibility evaluation of large-scale complex simulation system, on the basis of analysis of the characteristic of credibility evaluation of the complex system, it proposes a dynamic method for the credibility evaluation work from the standpoint of the engineering application, and validated by the following instance, it turns up to be effective for the guidance of the credibility evaluation.
Performance Analysis of State-Dependent M/Hk/1/L Queue with Balking
Authors: Tian Rui Ling , Yue De Quan , Wu Xi Jun
Published: September 2012

In this paper, we present an analysis for an queue with balking and state-dependent service. By using the block matrix solution, we first deduce the matrix form iterative formula of the steady-state probability. We also derive some performance measures of the system. Based on these performance analyses, we develop a cost model to determine numerically the system’s optimal cost and critical value. Finally, we perform a sensitivity analysis through numerical experiments.
Effect of VC Content on Abrasion Resistance of VC/Fe Composite
Authors: Zhang Guo Jun , Sun Zhi Ping , Zou Li Yan
Published: September 2012

Normal load can affect the wear performance of the materials. with the normal load increased, friction coefficient is firstly increases and then decreases, when the normal load is 80N, the minimum friction coefficient is 0.916; rotating speed can effect the wear performance of the materials with the change of rotating speed, the faster the speed, the bigger the friction coefficient When the speed is 60 rad/min, the minimum friction coefficient is 0.918.The content of VC can influence greatly for wear-resisting performance, when the content of VC was 55%, the wear performance of material is better, the friction coefficient is 0.916-0.918.The results show that: the microstructure analysis can judged that, in the wear process, iron is off first, then the particle phase, so VC grain can intensify the wear resistance.
A UML-Based Software Services Ecosystem Modeling Approach
Authors: Shen Ju Fang , Zhang Li , Fan Zhi Qiang , Abbasi Maissom , Rafique Irfan
Published: September 2012

This paper presents a software service ecosystem modeling framework. The framework includes resource model, actor model and standard model. The meta model of each model is described and a UML-based software service ecosystem modeling language is proposed. A case study is presented to show the practicality of the proposed framework. Finally we conclude by highlighting the research areas that in our opinion are worth for future investigation.
The Application Study of Simulation Model Based on Cellular Automata in the Evolution of Internet Public Opinion
Authors: Yao Cui You
Published: September 2012

In this paper, the author analysized the internet evolution of public opinion and thought it was suitable for simulating network evolution in public opinion by using cellular automata model. At the same time, it was discussed for the application of cellular automata simulation model of internet evolution of public opinion. In the end, the author gave some conclusions.
Model of Fire Co-Operation Based on DCPN
Authors: Zhao Rui Qi , Liu Fu Xian , Zhang Bo , Chen Yong Ge
Published: September 2012

To meet the need of deploying decision, co-operating decision, calculating the intercepting probability of target and realizing the simulation of firing in air-defense, we established the Dynamic Colored Petri Net, DCPN model, to solve the questions above. The model is definitely intuitionistic, convenient to realize in computer and clear to understand.
A New Model of Tourism Space Carrying Capacity
Authors: Yan Hui Li
Published: September 2012

Recently, in several articles, scholar Huang Yang Shan analyzed the method of calculating the carry capacity of scenic area, and pointed out the limitation of traditional method based on the turnover. Then he deduced an improved model. But in his studies there is no comparison analysis to the difference of the optimal capacity value of the models in different conditions, and his improved model still has some limitation. Therefore, this paper first presents a new tourism scenic capacity calculation model based on production line, then analyses the balance of the attraction time and the attraction capacity of the scenic depot, which is the important fact influencing the volume of the carry capacity. And then, we compared our new model with the traditional ones in different condition. The results show that the new model based on tourism production line is suitable for wider scope, and is more reasonable.
Analytical Solution for the Subsurface Flow Wetland Model
Authors: Cheng Feng Lin
Published: September 2012

In this paper, the subsurface flow wetland sewage treatment mathematical model is studied. the analytical solution is obtained by using the Laplace transform technique for non-steady subsurface flow wetland model and the diffusion characteristics for some parameters used in the model are analyzed. Then the solution for the model which is added by the source is obtained on two boundary conditions by the adomian decomposition method. The examples are given compare the approximate solution and the exact solutions.
Model and Simulation of the Brain Scalp Potential Analysis
Authors: Wang Xiang Li , Su Shi Mei , Shang Zhi Gang
Published: September 2012

Based on spherical head models, this paper, by employing the finite element method (FEM), analyzes the potential distribution of the brain scalp surface and attempts to work out the electroencephalography (EEG) forward problem, in hope of finding out the impact the dipole parameters has on it. According to the electromagnetism theory, this paper discusses the general resolution of EEG, it requires electric potentials of the globe's surface, and graphically displays results of computation through finite element post-processing, which tests their effectiveness. Furthermore, it analyzes the influences of dipole parameters on the potential distribution of scalp surface, such as position, direction and strength, which attempts to provide an effective method to solve EEG forward problem, based on diversified head model, and also proposes a prior information to the solution to EEG inverse problem.
Stability of the Redundant System with Two Correlated Units
Authors: Qiao Xing , Fang Ming
Published: September 2012

In this paper the qualitative behaviors of the two correlated units redundant system with two types of failure were discussed. By using the method of functional analysis, especially, the semigroup theory of bounded linear operators on Banach space, the well-posedness and the existence of positive solution of the system was obtained. By analyzing the spectra distribution of the system operator, the dynamic solution of the system asymptotically converges to the nonnegative steady-state solution which is the eigenfunction corresponding to eigenvalue 0 of the system operator was proved.
A Preliminary Study for Building Artificial Space Target System
Authors: Song Yi Ning , Li Zhi
Published: September 2012

This paper introduces a framework of parallel control and management for space target system (STS). An artificial space target system is a new type of astronautics simulation software that employs agent modeling, large scale calculation and concept of artificial societies to support the research and development in space engineering. First, introduce the concept of parallel system. Then, pose the definition of artificial space target system and its framework based on multi-agent modeling technology, an artificial STS that is consistent with realistic operations of the actual STS is constructed different kinds of computational experiments are performed on the artificial STS, followed by analysis and synthesis with a case. Finally, future work and issues related to operational mechanisms and strategies for such implementation are also addressed.
The Vibration Analysis and Improvements of Compressor and Pipeline for Reforming Hydrogen Device
Authors: Zhang Wei Pan , Yang Guoan , Zhou Zhi Yong
Published: September 2012

Excessive vibration was observed from hydrogen reciprocating compressor pipelines since the capacity expansion revamping of this unit finished in a refinery. The production had been frequently stopped since the vibrations on the pipelines exceeded the alarm value, which often led to a delivery failure of Hydrogen for subsequent reactions, causing great economic losses. In order to identify the root cause of vibration, reduce the airflow pulse peak, and enhance the pipeline security strength and rigidity of the structure, a comprehensive analysis on the reciprocating compressor and pipeline system was conducted. The vibration has been constrained in an acceptable range after the adjustment，and the unit has gotten a long-period and stable operation.
Design of Detecting System for Moving Target Based on Twice Mixing
Authors: Wang Kang Yi
Published: September 2012

The low altitude breakthrough has become an important battle mode of modern war, which brings the huge difficulty for low altitude defense. The microwave technology is an effective method to detect the moving target in the low altitude. Taking the frequency modulation of microwave as basic principle, and combined the Doppler Effect which can measure the velocity information of target, a microwave detecting system based on twice mixing is established. Its composition and working principle are analyzed, and the circuits are designed. The laboratory experiment indicates that it is completely feasible to apply the system to the detection of the moving target.
Numerical Study of the Thermal Performance in Natural Draft Wet Cooling Tower with Different Fill Types
Authors: Zheng Shui Hua , Jin Tai , Fan Jian Ren
Published: September 2012

Based on the heat and mass transfer theory and characteristics of the FLUENT software, a three-dimensional numerical simulation platform composed by user defined functions had been developed to simulate the thermal performance in a natural draft wet cooling tower. This platform was used to study a typical hyperbolic natural draft wet cooling tower with different fill types. The variations of the flow and temperature field in the cooling tower caused by the two different methods of fill were investigated. It is found that the outlet water temperature will decrease due to the non-uniform fill depth. The non-uniform fill depth is beneficial to increasing the efficiency of the cooling tower.
Design of Driving Circuit of Solenoid Valve for High Pressure Common Rail Diesel Engine Injector
Authors: Wang Jun , Jia Yong Hui , Zu Bing Jie
Published: September 2012

Based on the BOSCH injector for research object, driving circuit is adopted the "dual voltage" adjustable pulse width driven model. Using the method of combining simulation analysis and correlation calculation, the key parameters in the boost circuit and the logical drive circuit is studied and selected. Experimental results show that the driver modules meet the needs of high speed solenoid, basically achieved the target.
CFD Simulation Analysis of Pressure Drop in a Vertical Helical-Coil Heat Exchanger
Authors: Jiang Ning , Li Jia
Published: September 2012

The pressure drop in a helical-coil heat exchanger is studied. The helically coiled tube with a coil pitch of 1080 mm and coil diameter of 950 mm is fabricated by bending a stainless steel tube of 8m length and 15.6 mm inner diameter. The total height of the helix tube is 2.8 m. The concerned range of mass flow rate for two-phase flow is 25-100 kg/m2s. Computational fluid dynamics (CFD) simulation analysis of pressure drop in the vertical helical-coil heat exchanger is carried out.
Adjust the Content of Nickel in NiZnO Films by Vacuum Anneal
Authors: Dong Xin , Wang Jin , Wang Hui , Shi Zhi Feng , Zhang Bao Lin
Published: September 2012

NiZnO films were grown on sapphire substrates by metal-organic chemical vapor deposition (MOCVD). Then the films were annealed in vacuum at different temperatures for 1h. The UV emission peak was blue shifted in the photoluminescence (PL) spectra and a dramatic shift of (002) diffraction peak to higher angle was observed in X-ray diffraction (XRD) pattern with the increasing anneal temperature. It showed the band gap and the lattice parameter of NiZnO had been affected by anneal in vacuum. From the X-ray photoelectron spectroscopy (XPS) of the NiZnO film, we can find that the anneal temperature had an important effect on the content of each element in NiZnO quantificationally. In addition, the value of x in NiZnO varied slightly with the anneal temperature increasing. The above phenomena indicated that anneal in vacuum could slightly adjust the percentage of Ni indirectly in NiZnO film and offer a good idea in NiZnO devices facture.
A New Method for Tectonic Conserved Quantity on Invariant Manifold of Autonomous System
Authors: Yin Jun Yi
Published: September 2012

Reached the autonomous force system, indicate the concept of invariant manifold of autonomous system. If the autonomous force system exists the (n-1) dimensional invariant manifold,then the system invariant manifold’s generating function can be calculated, farther, we can construct the system’s conserved quantity by these generating functions. Last one illustrative example is given with the help of n-body.
Experimental Study on Wear Test of Grind-Hardened Layer
Authors: Liu Ju Dong , Yuan Wei
Published: September 2012

40Cr steel was grind-hardened on a surface grinder. The microstructure, wear resistance and wear mechanism of the grind-hardened layer were studied. The results indicate that the grind-hardened layer consists of the lath martensite and twin martensite, dislocation density is higher in the lath martensite. The microhardness is up to 670 HV0.5 and the compressive residual stresses exist in the grind-hardened layer. Compared with the matrix, the wear resistance of the grind-hardened layer is increased by 6-11 times. The wear mechanisms of the grind-hardened layer are characterized abrasive and oxidation under dry sliding conditions.
Numerical Simulation and Performance Study of Adjustable Steam Ejector Using CFD
Authors: Zhang Qi , Liu Ruo Fei , Liu Hao , Wang Ru Wu
Published: September 2012

A djustable ejector flow control can be achieved to export in a stable area, thus reducing the jet inlet parameters on the export parameters as well as the impact of the entire system, widening of the jet's effective operating range. In this paper, the establishment of an effective mathematical models and computational methods to commercial CFD software FLUENT 6.3 as a platform for the adjustable jet to simulate the internal flow process and performance research, exploration and analysis of the main needle is moved (ie the nozzle throat orifice area change) operating parameters (including the working fluid inlet pressure, inlet pressure and the lead body jet mixing fluid outlet pressure) on the adjustable jet performance of the law, for the adjustable jet to provide important parameters to optimize the design. Studies show that: ① the needle device with adjustable spray jet in a non-rated conditions, can increase the coefficient of the jet injector; ② other parameters remain the same circumstances, the adjustable jet to varying degrees, increased work pressure , suction pressure, discharge pressure and outlet flow range.
Numerical Calculation of the Pressure Distributions on a Rudder Surface
Authors: Wu Jing Ping , Chen Shun Huai , Xiao Ji Cheng
Published: September 2012

This paper numerically calculates the pressure distributions of a rudder of a ship for structure strength design. The sections profile of the rudder is NACA0020 airfoil. The viscous flow is simulated by FLUENT commercial software, while the model and mesh is generated by GAMBIT software. A 2D viscous flow around a NACA0020 airfoil is calculated firstly. Some notices are given here about the magnitude of computing domain, the density distribution and the numbers of grid nodes on the airfoil surface in order to gain better results. Then, based on these experiences, the viscous flow around a 3D rudder is simulated. The calculated pressure coefficients on the rudder’s section are compared with the experiment results and BEM results of the potential theory. At the attack angles and , the three results agree well with each other. However, when the attack angle is , the viscous results from FLUENT give better agreement with the experiment results than the BEM results. This conclusion confirms that the viscosity effect is great in the case of large attack angles.
The Fractional-Order Control Method of Dynamic Elastoplastic Responses of Benchmark Buildings
Authors: Zhou Xing De , Zhang Xiang , Jiang Dong Ju , Li Ping , Li Yong Zhi , Wang Lu Jian , Qing Fei Ma
Published: September 2012

The elastoplastic phenomenon of the structures will be advent under the action of the strong earthquakes, the presented research on the vibration control of the ones is chiefly concentrated on fuzzy and neuro-controller with the expense of bigger energy. In the paper, the 3-storey benchmark building is used as research object, the control strategy of vibration system with fractional-order is studied. The control method based on acceleration responses output is emphatically concerned as it is usually adopted in most actual application of active vibration control techniques. The concrete courses include the following three steps: the integer-order approximation of fraction-order, the transfer function reduction in frequency-domain which base on Pade approximation, the controller design and simulation. In the last, an example is used to show the feasibility of proposed method.
Design of Solar Tracker Based on Image Sensor
Authors: Wang Jing Bo , Wang Jing Tao
Published: September 2012

This article describes a detection, tracking control method. The image sensor is the core components of the system. The microcontroller determine the position of the sun to track, store location information, and offer protection measures implemented on the system in inclement weather. The system has high accuracy, good adaptability and other characteristics.
Developing Coarse-Grained Force Fields of Poly (methylmethacrylate-b-2-vinylpyridine) from Atomistic Simulation
Authors: Du Bo , Wang Zi Lu , He Xue Hao
Published: September 2012

A coarse-grained force field for poly (methylmethacrylate-b-2-vinyl pyridine) is developed based on the Iterative Boltzmann Inversion method. The proposed coarse-grained model, successfully reproduced the properties of the polymer melts obtained from atomistic simulations, may provide an efficient way to study their mechanical properties and self-assembly behaviors.
Inﬂuence of VC Precipitation on the Shape-Memory Effect and Corrosion Resistance on an Fe–Mn–Si–Cr–Ni Alloy
Authors: Zhang Lin , Dong Zhi Zhong , Liu Yong Chang , Wang Ya Peng , Liu Zhi Chao , Li Kang , Jiang Hua
Published: September 2012

The shape-memory effect (SME) and corrosion resistance of an Fe-20Mn-5Si-10Cr-5Ni- 0.7V-0.2C alloy, before and after aging, were investigated. The results showed that VC precipitation and bending temperatures obviously affect the alloy’s SME. Nearly perfect SME (90.2% of initial 4% bend) was achieved when the 2h aged sample was deformed at 223K. At the meantime, the electrochemical impedance spectroscopy (EIS) showed that the alloy, aged for 2h to 4h, exhibited the worst corrosion resistance in the research system related with the fine VC precipitates. The morphology and distribution of VC were observed by SEM.
Real-Time Infrared Image Analysis for Deformation Heat of Precast Defected PVC Sheet Based on MATLAB
Authors: Chen Sheng Ming , Luo Ying She , Zhang Yong Zhong , Su Jian Xin
Published: September 2012

In a deformation progress of a polyvinyl chloride sheet, the coupled deforming heat is recorded by a thermal infrared imager. In order to have a real-time study for the variation regularity of the deforming temperature field distribution, all infrared images are imported into MATLAB software as digital data through a dynamic link routine compiled based on MATLAB and Windows. By utilizing a gradient-based transition region extraction algorithm and an interpolation algorithm, the high-resolution recognized and reconstructed infrared images are obtained from original blurring images recorded in thermal infrared imager. The variations of temperature distribution are studied combining with the test data based on MATLAB.
The Construction of Cerebrovascular Model and Numerical Simulation
Authors: He Ling Na , Pan Jian Wei
Published: September 2012

Medical image reconstruction technique has been an important research topic. Based on cerebrovascular CT image of actual victims, through extracting the contour of image, dividing the nodes and defining boundary, the paper reconstructed 2D grid model of blood vessel of brain. Using the finite element method to simulate and analyze the dynamics features of the medical image mesh model. Through experiment, the paper mainly compared the value of blood velocity and dynamics pressure, and analyzed the difference of hemodynamic parameters in different models. Finally, It found that the model I artery more easily alter form and induce arterial hemorrhage. This will provide the theoretical basis for analyzing the mechanism of Cerebrovascular diseases.
Shifting Control and Simulation of Dual-Clutch Transmission
Authors: Wang Yong , Yi Jun , Xu Zhong Bao
Published: September 2012

This paper expounds the structure and working principle of gear-shifting of dual-clutch transmission (DCT), analyzes the shift process of dual-clutch transmission, and establishes its dynamic model and the evaluation index of shifting quality. Aimed at the evaluation index of the impact degree, this paper puts forward the method of controlling oil pressure of clutches and throttle opening of engine which makes the impact degrees to zero, uses smatlab/simulink to establish the simulation and the results tests the method is available.
The Simulation Platform of Network Control System
Authors: Liang Chen , Lin Jun
Published: September 2012

With the development of electronic technology, computer and networked communication technology, control system is speeding up from close and centralized architecture to being open and distributed, to satisfy the continuous developing requirement of control quality and management. Networked control system is gradually formed in the process, and soon become one of the most important domains of control technique. One of the research of networked control systems is the effect of network upon control systems .A simulation platform of networked control systems is designed for this purpose. Matlab is used to build models of real systems. The simulation platform gives good environment for the analysis and design of networked control systems.
3D Model Transformation of Waveguide Slot Array Antenna in Mechanical-Electromagnetic Analyses
Authors: Chen Mei , Zheng Fei , Li Na
Published: September 2012

The mechanical errors in a mobile waveguide slot array antenna will finally influence the electromagnetic performances. Hence it is necessary to understand the relationship between them, which requires mechanical-electromagnetic analyses. The 3D models in both mechanical analysis and electromagnetic analysis are greatly different. They need a precise connection and transformation. The paper proposes an effective 3D model transformation method. From 3D geometric model to 3D mechanical model, and then to 3D electromagnetic model, the precise connection and transformation can be finished. It can be used to increase the analysis precision of a complex waveguide slot array antenna.
Research on Loading Method of Linear Motor Reliability Test
Authors: Hu Ye , Yang Zhao Jun , Zeng Xiao Ming , Fang Jie , Wang Kai , Zhu Yan
Published: September 2012

Improving the reliability of linear motor is one of the best ways to improve its quality and performances. The core in reliability test is to simulate the dynamic loading as real operating condition. In this paper, a common loading model, which can reflect various operating conditions of linear motor, is proposed. Then a set of dynamic loading method for reproducing the operating conditions is put forward. This method completes dynamic loading against linear motor simutaneously in its moving and non-moving directions using servo control contact method and magnetic non-contact method, respectively. This research provides not only a set of feasible method for linear motor reliability test in lab, but also a prerequisity for studying linear motor reliability further.
Undercooled Solidification of Ni-3.3wt.%B Alloy
Authors: Liu Feng , Xu Jun Feng
Published: September 2012

Ni-3.3wt.%B alloy solidified at different undercooling by glass fluxing has been studied. The as-solidified structure is mainly controlled by the undercooling for eutectic solidification, ΔT2, instead of ΔT1, the undercooling for primary solidification. For ∆T22 ≥145±5K, three recalescence peaks appear in cooling curves. If ∆T22≥145±5 K, two kinds of dot phases occur. Further analysis declares that, the regularly distributed dot phases with larger size come from the transformation L→Ni23B6+Ni, whereas, the irregularly distributed ones with smaller size come from Ni23B6→Ni3B+Ni. Both of them have a contribution to strengthen the mechanical property.
Carrier-Based Modulation Strategy and its Dead-Time Compensation Method on Two-Stage Matrix Converter
Authors: Guo Xu Dong , Wu Wen Hua , Su Mei , Feng Zhuo Wen , Shen Qun Tai
Published: September 2012

To deal with the problem that dead time is indispensable and that its compensation is difficult to implement especially when taking Space Vector Modulation method to modulate the inverter stage of Two-Stage Matrix Converter (TSMC), this paper presents a Carrier-based Modulation (CBM) strategy suitable for the TSMC and amplifies concerned the uniqueness of the proposed CBM. Based on this, the dead-time effect to TSMC is analyzed, formula for describing dead-time effect is induced, and two compensation methods are given, namely modulation voltage modification method and time compensation method. At last, the uncompensated and compensated experiments are carried out on the prototype, and the results prove that this strategy meets the satisfaction.
E-pH Diagram of Fe-N-H2O System and its Application in Nitrite
Authors: Li Jun Guo , Shi Yan , Wang Fan , Feng Yan Ping
Published: September 2012

Reduction product of nitrite by Spherical sponge iron (SSI) was investigated through static state experiment combined with E-pH diagram of Fe-N-H2O system. In a certain range of pH and redox potential, the speciation of iron include Fe0, Fe2+, Fe3+, Fe(OH)2 and Fe(OH)3, and the speciation of N was NO2, NO3-, N2, NH4+ or NH3 as the initial speciation of N was nitrite. pH in solution increased to above 10 in 6min because of rapid erosion battery reaction of zero-valent iron. Moreover, the E value in solution declined quickly to the minimum and then increased slightly because of dissolution of oxygen from atmosphere. It was suggested that ammonium was the finial product during the reduction of nitrite by SSI. Nitrite removal from wastewater was related with escape of ammonia, which was gas state of ammonium, when the water solution was alkaline.
A Dynamic Game Approach for Analyzing the Coalitional Stability of Cascaded Hydropower Stations
Authors: Song Heng Li , Yue Chao Yuan
Published: September 2012

A game model is proposed to discuss the possible coalition structures of hydropower stations. The stable coalition structures in different contexts of electricity markets are derived on basic of numerical simulation using the raw data of three hydropower stations on the middle and lower reaches of some river in China's south-western region as a case. The coalitional stability is analyzed by a dynamic cooperation game approach using the conception of LCS and EPCS. The total purchase power fees of the grid in three coalition structures are calculated and compared to analyze the effects of coalition structures on the social benefit.
The Research and Application of Leveler Knowledge Base System
Authors: Wang Qiu Shu , Hu Ying , Huang Qing Xue
Published: September 2012

The control system of third generation leveler has introduced the intelligent models system, knowledge base system, self-learning system and other advanced technologies. Among them, the intelligent model system and knowledge base system is a core of leveler process setting system, and they determine the advanced level of leveler control system. As an original material information database of intelligent model system, the knowledge base system can provide basic parameters for the model operation and assist the process model to complete the setting of parameters. These provide a prerequisite for achieving automatic straightening of leveler. As the core of leveler control system, the knowledge base system contains lots of modules, such as knowledge base module, data management module, self-learning module and so on. By these modules, the system can achieve storage, management, self-learning and other functions for original information of plate. The leveler adopts DCS and OPC technology to achieve the control and communication of the whole system. In addition, using Oracle10G database and HP380 server clusters can achieve the storage and management function for knowledge base date.
Visual Intelligent Vehicle Control System’s Design Based on PC9S12XS128 MCU
Authors: Han Yi Lun , Zhang Zong Bing , Wen Xue Lei
Published: September 2012

In this paper, PC9S12XS128 MCU produced by Freescale Semiconductor Co., Ltd is used as the core control unit to designed a intelligent vehicle, which can be free to follow the line of travel. The main control system including motor drive module, server drive module, the path identification module, power module, etc..Through compare a variety of hardware control program, use the best program to take control of car model’s speed and direction. Experimental results show that the intelligent vehicle designed can antomatic driving on the path of human plan accuracy.
Design of Universal Experimental Interface Based on STM32
Authors: Yang Hao , Tong Jian Ping , Xu Dan Yang , Sui Cheng Hua
Published: September 2012

Based on Franck-Hertz experimental instrument and photoelectric effect experimental instrument, an universal experimental interface is proposed.And its circuit is designed, which is based on an ARM Cortex-M3 core 32 bit processor STM32F103.The interface is a data exchange center between the experimental instrument and visual display .It can collect the analog data from experimental instrument, after A/D conversion and storage, then the result is sent to the host computer or the oscilloscope after D/A conversion. Besides,it can also export digital signal to control the analog output of experimental instrument, collect the analog data and export digital signal to the oscilloscope after the interface’s processing.Furthermore, the universal interface has the interface which can be upgraded by on-line, and can be updated by the remote software.
Contour Extraction for Images of High Temperature Long Shaft Heavy Forgings
Authors: Xia Qin Xiang , Li Zhe Lin , Zong Wei Qi , Xie He Qing
Published: September 2012

Non-contact measuring method based on CCD camera is desirable for product quality of high temperature long-shaft heavy forgings. In the light of the characteristics of RGB primary color and halation in forging image, the mean red gray value in the high temperature area is proposed as the dynamic threshold to acquire external contours. Internal edges in the image of the hot forging are blurry and discontinuous. For these characteristics, a method based on quadratic B-spline curve is employed to extract and fit the internal contours. Experiments show that this method can effectively remove pseudo features and extract accurate internal and external contours for images of high temperature squaring and chamfering forgings of 900 0C to 1050 0C.
A Breeding Greenhouse Based on the Intelligent Control System
Authors: Zhang Shou Yu , Lin Jian , Ding Guo Chang , Zhang Xiang
Published: September 2012

In order to control the greenhouse system of temperature, humidity, the concentration of carbon dioxide and some other environmental parameters during the plant seedlings process, design a greenhouse real-time monitoring system by using a PLC module, this system can realize the function of controling the various environmental parameters during he plant seedlings process to achieve the best environment plant growth process requirements.
A New Robust Controller for Flight Control System of Hypersonic Flying Vehicle
Authors: Zhang Ren , Fan Jian Fang , Li Jing Jing
Published: September 2012

In this paper, a new robust controller design scheme integrating a nominal controller and a compensator is discussed. The nominal controller is designed for good performance of nominal system using nonlinear dynamic inverse control technique. The compensating controller can be seen as a standalone loop added to the system to compensate the effects of uncertainties guaranteeing the stability of the system. A nonlinear extended state observer-based compensator is proposed. The stability of the whole closed-loop system is analyzed. Application of the new robust control design method to attitude control of hypersonic flying vehicle is demonstrated with a 6-DOF simulation example.
Proportional-Integral Control for Markovian Jumping Systems with Distributed Time Delay
Authors: Wang Yi Zhong
Published: September 2012

This paper deals with the proportional-integral control problem for a class of stochastic Markovian jum v-Krasovskii functional and free-weighting matrix method, the novel delay-dependent robust stabilization criterion for the stochastic Markovian jumping systems is formulated in terms of linear matrix inequality (LMI). When the LMI is feasible, an explicit expression of the desired proportional-integral controller is given. Designed controller, based on the obtained criterion, ensures asymptotically stable in the mean square sense of the resulting closed-loop system for all admissible uncertainties and time delay.
Research on UCAV Efficiency Evaluation System Based on VxWorks
Authors: Wang Cun Ren , Zhou Xiao Cheng , Yan Jian Gang
Published: September 2012

UCAV efficiency evaluation system is used to evaluate the UCAV efficiency index and show the evaluation conclusions. The evaluation system is studied based on VxWorks that has high reliability and good real time character. The UCAV efficiency indexes are analyzed on this paper first. Then system function, system configuration and operating system are discussed. The key points of the system are also analyzed on this paper. At last, the collectivity designing mind of UCAV efficiency evaluation system is acquired. The system can finish the task of UCAV efficiency evaluation under the complex battle circumstance.
Fluid Structure Coupling Analysis of Ultrasonic Traveling Wave Driving
Authors: Wei Chang Zhi , Wei Shou Shui , Zhang Ya Tao , Zhang Chong
Published: September 2012

An ultrasonic travelling wave micro-fluid driving model was presented. Principle of the driving model was introduced and finite element model was developed. Resonance frequencies were predicted by modal analysis. Fluid structure coupling analysis was done to observe the transient fluid velocity. The time-averaged velocity was calculated. Influences of driving voltage, driving frequency and fluid viscosity on time-averaged velocity were taken into accounted. The results indicate that the time-averaged velocity profile is asymmetric parabola and is influenced by the driving frequency obviously. The maximum time-averaged velocity decreases with the increasing of fluid viscosity and reflux appears when the fluid viscosity reaches to 0.07Pa·s.
Corrosion Inhibition of Vitamins B for Hot Dipped Zn Coating Steel in Hydrochloric Acid
Authors: Ju Hong , Li Qiang , Ju Yu Lin
Published: September 2012

The inhibition effect of excellent environmental-friendly corrosion inhibitors-Vitamins B of hot dipping Zn coated steel in diluted HCl was investigated using quantum chemistry analysis and weight loss test. Calculation result shows Vitamins B have a number of active centers. The value of Mulliken charge, distribution of HOMO and LUMO implies its good ability of electron exchange with metal surface. The test results indicate IE% increased with the inhibitor concentration, and the highest IE reached 97%.
Application of PLC in the Production Line of Ore
Authors: Li Cheng Qun , Hou Kai Yuan
Published: September 2012

This article describes one of production lines of automatic control in ore production, which consists of feeding, crushing and conveying equipments and so on. It elaborates the composition and process of the entire system. According to control requirements in this system, electrical control system is designed, which chooses PLC as the core component of it, including hardware circuit and software programming. Furthermore, some anti-interference measures are taken in order to improve the reliability of the system.