bluuebunny/crossref_metadata_2025 huggingface dataset:
Cost Optimization Problem of Hybrid Flow-Shop Based on PSO Algorithm
Authors: Han Zhong Hua , Ma Xiao Fu , Yao Li Li , Shi Hai Bo
Published: June 2012

A PSO-algorithm-based job scheduling method that takes production cost as optimization object is presented in this paper. The cost optimization model of HFSP, in which production cost is considered as an optimal factor, is constructed. PSO is used to take global optimization, make the production task assignment and find which machine the jobs should be assigned at each stage, which is also called the process route of the job. After that the local assignment rules are used to determine the job’s starting time and processing sequence at each stage. The total production cost converted by time-based scheduling results is comprehensively considering the processing cost, waiting costs, and the products storage costs. The numerical results show the effectiveness of the algorithm after comparing between multi-group programs.
Study on Coarse-Grained Parallel Genetic Algorithm
Authors: Chen Yan , Wei Xing
Published: June 2012

The genetic algorithm is a powerful global search and optimization technique based on the principles of natural selection and genetics, but it is not suitable in solving large-scale and complicated problems due to its the shortcomings in computational accuracy and efficiency. Against these deficiencies, a coarse-grained parallel genetic algorithm (PGA) model based on distributed cluster system is proposed in this paper. Flow chart about the model is designed and detailed analysis of migration scheme is offered. This paper investigates the parallel efficiency of the coarse-grained PGA and migration operator by experiments on a specific inverse heat conduction problem .The experimental results show that the model can achieve upper speedup rations, improve computational efficiency and the overall performance of the PGA.
Research on Data Mining Based on Apriori Algorithm
Authors: Wang Pei Ji , Zhao Yu Lin
Published: June 2012

With the availability of inexpensive storage and the progress in data collection tools, many organizations have created large databases of business and scientific data, which create an imminent need and great opportunities for mining interesting knowledge from data.Mining association rules is an important topic in the data mining research. In the paper, research mining frequent itemsets algorithm based on recognizable matrix and mining association rules algorithm based on improved measure system, the above method is used to mine association rules to the students’ data table under Visual FoxPro 6.0.
An Algorithms for Super-Resolution Reconstruction of Video Based on Spatio-Temporal Adaptive
Authors: Li Meng He , Lin Chuan , Tian Jing Bei , Pan Sheng Hui
Published: June 2012

For the weakness of conventional POCS algorithms, a novel spatio-temporal adaptive super-resolution reconstruction algorithm of video is proposed in this paper. The spatio-temporal adaptive mechanism, which is based on POCS super-resolution reconstruction algorithm, can effectively prevent reconstructed image from the influence of inaccuracy of motion information and avoid the impact of noise amplification, which exist in using conventional POCS algorithms to reconstruct image sequences in dramatic motion. Experimental results show that the spatio-temporal adaptive algorithm not only effectively alleviate amplification noise but is better than the traditional POCS algorithms in signal to noise ration.
Research on Algorithm of Function Set Mining Based on Interests
Authors: Zhang Jing Zun , Wang Yu Xin , Zhang Rui Zhe
Published: June 2012

Function mining aims to discover valid functions from various data which seem not related. Nowadays, the results of most mining algorithms are not capable to characterize the things fully, because the algorithms aim at one simple function, meanwhile, another one can achieve this task, but its efficiency is very low because of the too much iteration. The paper presents one new algorithm named interest-based function set mining algorithm (IFSM), it applies the user's experience, expectations and prior knowledge to the mining process. IFSM succeeds in improving the description and enhancing the mining efficiency and quality.
Application of Chaotic Encryption Algorithm in RFID Secure Mechanism
Authors: Deng Ai Ping , Xiao Ben
Published: June 2012

It urgently needs to solve the information security issues of RFID system at present. In order to increase the security of RFID Secure Mechanism without affecting the operation efficiency, a novel chaotic encryption scheme is proposed to improve the RFID information security in RFID. The Logistic map with variable initial value is used to generate chaotic cipher sequence, and then the sequence is encrypted. Related analysis and simulation experiment verified that this chaotic encryption RFID Secure Mechanism is easily to realize. It shows that the novel chaotic encryption can completely meet the security demand of the RFID systems effectively.
A New Hybrid Image Reconstruction Algorithm for Magnetic Induction Tomography
Authors: Chen Yu Yan , Wang Xu , Yang Dan , Lv Yi
Published: June 2012

A new hybrid algorithm is presented in this paper, which solves the ill-posed inverse problem of magnetic induction tomography (MIT) and improves the quality of reconstructed image. The hybrid algorithm firstly produces the preliminary image region using Tikhonov regularization algorithm, and then it obtains the final reconstructed image using variation regularization algorithm. The hybrid algorithm, compared with the Tikhonov regularization algorithm and the variation regularization algorithm, overcomes the numerical instability of MIT image reconstruction and accelerates the convergence speed of image reconstruction, and it also improves the resolving power of targets conductor and the quality of the reconstructed image. Simulation results show that the quality of the reconstructed image obtained using the hybrid algorithm is enhanced, so an effective algorithm for magnetic induction tomography (MIT) is introduced.
Evolutionary Algorithm Research Based on Neural Network for Fuzzy Cognitive Map
Authors: Liu Ping Ping , Hao Ying Jun
Published: June 2012

Fuzzy Cognitive Map (FCM) fails to represent the measures of uncertain causal relationships, proposes an evolutionary algorithm Based on Neural Network for FCM. This algorithm integrates the high non-linear mapping ability of neural network and the globally optimizing ability of evolutionary computation to improve the dynamic reasoning for fuzzy knowledge.
A Novel Filtering Algorithm Based on Least Square Support Vector
Authors: Li Ya Qin , Xu Yang Hua
Published: June 2012

In this paper, we proposed a novel filtering algorithm that using the Ricker wavelet kernel to reduce the noise. The algorithm based on Support vector machine (SVM) which is a machine learning method on the base of statistical learning theory. Those parameters of the new algorithm affect the rising edge, the band width and central frequency of passband. The experimental results of synthetic seismic data show that the filter with the Ricker wavelet kernel works better than other methods．
Complex Relationship Mining Algorithm and its Application
Authors: He Tong
Published: June 2012

Based on rough graph theory, this paper gives a new algorithm in rough network, which generalizes the classical algorithm of exploring maximum flow. This algorithm successfully deals with a kind of complex relationship mining problem between different relationship levels. Simulation shows the effectiveness of this algorithm.
Fast Multilevel Thresholding Method for Image Segmentation Based on Improved Particle Swarm Optimization and Maximal Variance
Authors: Peng Zheng Tao , Fang Kang Ling , Su Zhi Qi , Li Shi Hong
Published: June 2012

To determine the optimal thresholds in image segmentation, a new multilevel thresholding method based on improved particle swarm optimization (IPSO) is proposed in this paper. Firstly, use the conception of independent peaks to divide the histogram to several regions, secondly, the optimization object function using maximum between-class variance (MV) method can be gotten in each area, by the non-uniform mutation and Geese-LDW PSO optimization of the object function, the optimal thresholds can be gotten, and the image can be segmented with the thresholds. Compared with the basic MV algorithm and genetic algorithm (GA) modified MV, the experimental results show that the new method not only realizes the image segmentation well, but also improves the speed.
Near-Replicas of Web Pages Eliminating Repetitive Algorithms Based on MD5
Authors: Yan Jun Ya , Ma Xiao Hui , Zhao Wen Juan
Published: June 2012

The development of the internet and exponential growth of network information produce a large number of duplicated pages on the network, reducing the retrieval of recall and precision and affecting the retrieval efficiency. The accuracy of the web, therefore, influences the quality of search engine. On the basis of the structural text description, this paper proposes an improved eliminating repetitive algorithm method, which is based on MD5 of Near-replicas. It proves that the method has a good effect on improving the recall and the precision through experiment.
Research on the Genetic Algorithm Simulating Human Reproduction Mode and its Blending Application with Neural Network
Authors: Yan Tai Shan
Published: June 2012

In this study, a genetic algorithm simulating human reproduction mode (HRGA) is proposed. The genetic operators of HRGA include selection operator, help operator, crossover operator and mutation operator. The sex feature, age feature and consanguinity feature of genetic individuals are considered. Two individuals with opposite sex can reproduce the next generation if they are distant consanguinity individuals and their age is allowable. Based on this genetic algorithm, an improved evolutionary neural network algorithm named HRGA-BP algorithm is formed. In HRGA-BP algorithm, HRGA is used firstly to evolve and design the structure, the initial weights and thresholds, the training ratio and momentum factor of neural network roundly. Then, training samples are used to search for the optimal solution by the evolutionary neural network. HRGA-BP algorithm is used in motor fault diagnosis. The illustrational results show that HRGA-BP algorithm is better than traditional neural network algorithms in both speed and precision of convergence, and its validity in fault diagnosis is proved.
An Energy Efficient Wireless Sensor Network QOS Multicast Routing Algorithms Based on Ant Colony Algorithm
Authors: Zhang Qi , Xiong Hai Jun
Published: June 2012

Multicast routing technology of wireless sensor network is a method of transferring special data to a group of clients selectively; therefore, quality of the services is the key to evaluate the method. Ant colony algorithm is a bionic optimization algorithm. Improved QoS Multicast Routing Algorithm is proposed based on energy constraint and based on ant colony algorithm, it takes into account the energy cost routing, making the nodes to establish of minimum cost path under the condition of energy constraint. The results show that this algorithm can obtain better energy balance, improve the network services of the time. This algorithm applies to energy-sensitive multicast applications in wireless sensor networks.
Watermarking Algorithm Based on Video Features
Authors: Yang Cheng Zhong , Zheng Xiao Shi , Ding Yuan Yu
Published: June 2012

A variety of video watermarking algorithm is not rare. But the connection of watermarking algorithm and video feature is a completely new field. This algorithm attempts to generate the watermarking image based the number of video’s key frames. All the key frame numbers are converts to a binary matrix after data transformation, at last the binary image is produced. According to those steps, the watermarking image reflects the video’s features, so it is easy to resist the watermark copy attack.
The Research of Web Image Recognition Algorithms Based on Knowledge Base
Authors: Shi Lin , Chi Zeng Xiao
Published: June 2012

The paper mainly studies the algorithm of identifying the object of the web image, using the visual feature of the object in the image and the knowledge base, based on the image analysis and the extraction of the text in the web image.
An Improved Apriori Algorithm Based on Similarity
Authors: Zeng An Ping , Liu Dun , Chen Hong Mei
Published: June 2012

The disadvantages of Apriori algorithm are firstly discussed. Then, a new measure of cosine similarity is proposed and treated as an interest threshold. Furthermore, an improved Apriori algorithm called Sim-Apriori is proposed based on similarity. It cannot only accurately find the relations between different products in transactions databases and reduce the useless rules but also handle the negative rules. Experiments have been carried out to verify the effectiveness of the algorithm. A Sim-Apriori system is developed by ASP.NET and SQL SERVER in B/S mode. The result shows that the algorithm is effective at discovering the association rules in sales management related ERP.
An Improved Genetic Algorithm of Web Services Composition with QOS
Authors: Zhang Yan Yan , Xiong Hai Ling , Zhang Yong Chun
Published: June 2012

A web service composition method based on the adaptive genetic operator was proposed to deal with the issues of the lack of adaptability and the easy-premature phenomena in web services composition genetic algorithm. Adaptive crossover and mutation operator were designed according to the individual adaptability and evolution stage for enlarging local search range and increasing convergent speed. Moreover, use for reference the idea of taboo table in taboo search algorithm, we can inhibit the algorithm from converging to false optimal solution untimely; meanwhile, an evolution strategy was adopted to prevent the loss of composite service with high fitness value. The experimental result shows that better composite services can be gotten through the improved algorithm; moreover the convergence speed has also been improved.
The Research and Improvement of APFFT Algorithm
Authors: Diao Jie Tao , Guo Jing , Li Nan , Yi Wei , Liu Sen , Li Qiang , Xu Hui
Published: June 2012

Discrete Fourier Transform (DFT) is widely used in spectrum analysis. All Phase Fast Fourier Transform (APFFT) is proposed to improve FFT. It has merits such as phase invariance and small spectral leakage. But APFFT is a concrete algorithm. There are no parameters to adjust the result. The paper researches APFFT by changing the length of the overlapping data segments of APFFT. This change gives APFFT some new characteristic and some meaningful results are got.
Multiple Blind Watermark Algorithm Based on Wavelet Packet Transform and Two-Dimensional Chaos Scramble
Authors: Zhao Tian Zhong , Chen Tao , Xu Jia , Wang Tao , Shi Wei Yi
Published: June 2012

In this paper, multiple blind watermark algorithm based on wavelet packet transform (WPT) and two-dimensional chaos image scramble is put forward. In the sub-images of WPT, multiple watermarks are embedded and distilled blindly. Meantime, the image contrast enhancement to hidden information before hand can improve its robustness effectively. In order to improve the security, two-dimensional chaos image scramble algorithm is designed. Experimental results show that the multiple blind watermark algorithm has good invisibleness, security and robustness to common image processing and noise attack.
A New Path Planning Algorithm Based on the Virtual Ridges for an Agro-Machinery
Authors: Bai Xiao Ping , Hu Jing Tao , Li Tao Chang , Liu Xiao Guang , Gao Lei
Published: June 2012

This A new path planning algorithm of agro-machinery based on the virtual ridges is proposed in this paper. A virtual ridge is determined by the width of a real ridge and the operating width of the agro-machinery to make the agro-machinery operate effectively. First, the algorithm divides a rectangular plot into some basic units, and makes a complete and exclusive path plan in the basic unit. Then, the path planning algorithm in the basic unit is extended to the entire rectangular plot. The algorithm is proved to be effective in path planning and convenient for the agro-machinery headland turning.
Formal Specification Technology of Modeling Based on Feature
Authors: Zhao Xiao Feng , Wang Yan Yan , Zhou Yi Qi
Published: June 2012

Based on the analysis of existing product specification STL, IGES, STEP, a new product model approach based on feature was put forward. According to data specification method, this article studied the specification description technology. At last, with reference to STEP specification, a new neutral text data format of this method was designed, which contained the construct feature information.
Wind Tunnel Test and the Analysis of Buffeting Performance of Free-Standing Tower of Cable-Stayed Bridge under Yaw Wind
Authors: Zhao Guo Hui , Li Yu , Bai Hua
Published: June 2012

The buffeting performance of free-standing tower of JiangHai Navigation Channel Bridge, a cable-stayed bridge, under yaw wind is investigated by means of wind tunnel test of aeroelastic model. It is found that the variation of buffeting response of free-standing tower with wind yaw angle is not monotonous. The lateral buffeting response on the top of the free-standing tower reach their minimal values and maximal values at around 150°and 180°of wind yaw angle respectively and the longitudinal buffeting response attain their maximal values at around 90°of wind yaw angle. Also, at the 2/3 height of the tower the lateral buffeting response and torsional buffeting response get their minimal values at around 150°of wind yaw angle, and at around 180°achieve the maximal values. It is also seen that, the buffeting response changes with the wind speed at a conic curve approximately.
Comparative Study on Dynamical Performance of Hybrid Ceramic and Steel Ball Screw Mechanism Based on Multi-Body Dynamic Simulation
Authors: Jiang Hong Kui , Liu Li , Song Xian Chun
Published: June 2012

Current ceramic is used as the material for high speed ball bearing for its low density and lubricant performance; however the most common material for the high speed ball screw is chromium-molybdenum steel rather than the ceramic. Following the hertz contact and raceway control theory of the ball screw and considering the centrifugal force and gyroscopic moment acting on the ball screw, the dynamic model of high-speed ball screw was set up. The effects of different types of working ceramic ball chains on the mechanical properties of the ball screw were studied and compared through multi-body dynamic simulation. The result has shown that these factors affect the dynamic characteristic of ball screw dramatically, and the dynamic characteristic of ball screw at high speed is greatly different from that of ball screw made by chromium-molybdenum steel.
The Effect of Heat Treatment on Mechanical Properties of Car Interior Fabric Used for Injection Molding
Authors: Chen Wei Lai , Yi Ding Hong , Zhang Jian Fu
Published: June 2012

The purpose of this paper is to study the effect of high temperature in injection molding process on mechanical properties of the warp-knitted and nonwoven composite fabrics (WNC)used in car interior. Tensile, tearing and peeling properties of WNC fabrics were tested after heat treatment under120, 140,160,180°C respectively. It was found that, after 140°C heat treatment, the breaking and tearing value of these WNC fabrics are lower than others. The results of this study show that this phenomenon is due to the material properties of fabrics. These high temperatures have no much effect on peeling properties of these WNC fabrics. It is concluded that in order to preserve the mechanical properties of these WNC fabrics, the temperature near 140°C should be avoided possibly during injection molding process.
Integrality Assessment of Tubular Joints in Aging Offshore Platform Based on Reliability Theory
Authors: Lin Hong , Chen Guo Ming , Wang Zheng Fang , Yang Lei
Published: June 2012

The paper presents a reliability-based approach to assess the structural integrality of tubular joints with cracks in aging offshore platforms. Two different fatigue failure models are established respectively according to crack propagation size and equivalent fatigue strength, and the corresponding computing methods of fatigue reliability are proposed. The fatigue stress of tubular joint suffering sea wave load is calculated by spectrum analysis. The numerical examples are given to show the difference between the two reliability models. Considered the influence of inspection and repair, the reliability is updated by two different maintenance schedules. The analysis results can help to work out the optimal inspection planning, so as to prolong the service life for aged offshore platforms.
Absolute Blood Flow Measurement of early Stage Chicken Embryo Heart Using High Speed 4D Optical Coherence Tomography
Authors: Ma Zhen He , Liu Xu , Wang Qiao Yun , He Zhong Hai
Published: June 2012

The measurement of blood-plasma absolute velocity distributions with spatial and temporal resolution in vivo is important for research on early stage embryo heart development. We introduce a novel method to measure absolute blood flow velocity based on high speed spectral domain Optical Coherence Tomography (OCT) and applied it to measure velocities on the heart outflow tract (OFT) of a chicken embryo (stage HH18).
Effect of Diamond on the Thermal Conductivities of Diamond-Copper Composites Prepared by Spark Plasma Sintering
Authors: Dong Ying Hu , Zhang Rui Qing , Ye Zhi Guo
Published: June 2012

Diamond-copper composites are fabricated by spark plasma sintering (SPS). The effects of particle size, original properties and coatings of diamond on the thermal conductivity (TC) of diamond-copper composites have been investigated, respectively. The results indicate that thermal conductivity of composites enhances with an increase in particle size and original properties of diamond. Composites with Cr, Ti or Ni coatings on diamond surface appear remarkably higher TC than that which without any coatings. The improvements of TC of diamond/copper composites are mainly due to the large particle size diamond decreasing the interfacial area in composites, the high original properties diamond possessing higher original TC, and coatings on diamond surface declining the interfacial thermal resistance and improving the wetting properties between diamond and copper.
Research on the Influence of the Aerodynamic Measure on the Flutter Derivative of the Steel Truss Suspension Bridge
Authors: Bai Hua , Guo Wei , Li Wei , Li Yu
Published: June 2012

Flutter derivative is a significant index of the structure flutter stability. Identifying flutter derivative precisely contributes to the bridge flutter stability analyzing. In this paper, we take a research on the Liujiaxia Bridge in Gansu Province, China. Different flutter derivatives, which were got via segment model vibration tests with different aerodynamic measures, were classified, and made comparison in order to get the law of how different aerodynamic measures effect on the flutter derivative. The results show that, setting central stabilized plate, Build-in deflector, flange plate all affect flutter derivative significantly, which leads to changes in the flutter critical wind velocity of the structure. Setting central stabilized plate above the deck contributes to identify the flutter derivative of the 0° and positive attack angle, while setting central stabilized plate will contribute to flutter derivative identification at negative angles. It will make it difficult to identify the flutter derivative at 0° and -3° if the built-in deflector was set. Wind plate contributes to the identification of the flutter derivative at +3°, however, it will make it harder to identify the flutter derivative at 0° and -3°.
Effect of Thermal Charging of Iron Ore Pellets on the Reduction Rate and Compressive Strength in Gas-Based Reduction Process
Authors: Huang Zhu Cheng , Yang Dao Guang , Yi Ling Yun
Published: June 2012

Burden in gas-based direct reduction process is iron ore oxide pellet, which has experienced oxide roasting and cooling before reduction. However, it would be heated again in the reduction process. This may cause much energy waste and adverse effects on reduction process. In this paper, roasted pellets with and without cooling were charged for gas-based reduction respectively. The reduction rate and compressive strength during reduction were studied to reveal the effects of charging methods. Results showed that there is little difference on reduction rate between the two. However, the compressive strength of reduced pellets via thermal charging improves obviously. And nucleation and growth mechanisms of iron crystal grain in gas-based reduction were investigated by optical microscope (Leica DMRXP). The iron crystal nucleuses firstly form at the interface of grains and edge of wustite, and then gradually grow from surface layer to inner core as reduction proceeds. Thermal charging can promote the migration and accumulation of iron crystal grain effectively.
Finite Element Analysis of the Process of Drilling Medical Titanium Sheet
Authors: Shen Hong , Deng Yu Feng , Hao Jian
Published: June 2012

This article showed that the research of the process of drilling medical titanium sheet. Internal stress, strain and temperature distribution could not be seen, so based on Finite element analysis software, establishing finite element model of the process of drilling. On the basis of the inspection and studying existing drilling technology, three options were proposed .In view of stress, strain, temperature, and axial force, analyze the process of drilling titanium sheet. The results showed that penetration rate in 1000r/min and feed in 0.04mm/r, twist drill drilling medical titanium sheet is more reasonable.
CFD Simulation of Volute of Variable Geometry Turbocharger
Authors: Lei Jie , Wang Yan Song , Ren Hong Juan
Published: June 2012

To study the Volute of Variable Geometry Turbocharger (VGT) flow field and the possibility of providing the basis theory for control strategy and matching with engine, in this paper, a method is presented. The 3D viscous compressible flow in the model of volute and the vanes is simulated by CFD using FVM (Finite Volume Method). And taking some VGT as an example, the simulation is carried out. The result shows that the method can display the distribution of pressure and velocity in the model clearly. The zone and the reasons resulting in loss will be found after analyzing the results, and then the turbocharger can be optimized and redesigned purposeful to reduce the losses resulted from improper figure. The distribution of pressure and velocity at open and close vanes will be found after analyzing the results, and the basis theory for VGT control strategy and matching with engine can be provided.
Study on the Stress Relaxation of Polychloroprene Rubber by Molecular Dynamics Simulation at Different Temperature
Authors: Gao Yue Kai , Ding Xue Jia , Hu Tao , Li Yi , Wu Si Zhu
Published: June 2012

In this study, molecular dynamics (MD) simulation has been employed to investigate the distribution function of gyration radius under different temperatures. The structure of chloroprene rubber (CR) was constructed and the circles of energy minimization were applied. The fitting functions of normal stress with time under different pressures were obtained. Compression stress relaxation experiment of different temperatures was also conducted. Comparing with the coefficient of stress relaxation from the experiment, it was found that the theoretical stress relaxation results were similar to the experimental data. The results indicated that the mean-square radius of gyration decreased with reduction of temperature, which corresponded to the typical viscoelasticity stress relaxation behaviors of polymers. It is confirmed that the variation of mean-square radius can be used to quantitatively describe the stress relaxation of rubber system and a good agreement between the theoretical curves with the experimental data can be obtained from MD simulation.
Thermal Stress Simulation of Cooling Tube with Grid Plate Using Indirect Finite Element Method
Authors: Song Chang Li , Ji Jing
Published: June 2012

Indirect finite element method was used to analyze the thermal - structural coupled field of cooling tube with grid plate, and the process of finite element modeling, loading and solution were given. Cooling grid tube deformation shape and node radial deformation curve were obtained by finite element analysis and the deformation increases gradually from pipeline inner wall to the outer wall, so the nonlinear performance is significantly. Deformation of grid plate increases linearly, and the maximum and minimum deformation are respectively for 0.32mm and 0.22mm. Diameter, axial and hoop stress distribution of cooling gate can be obtained, and the results show that heat transfer result in structure internal stress, radial stress is the state of compression at the place of cooling grid and pipeline Interchange, the axial stress is the state of compression in the middle of a cooling grid, the hoop stress is pressure at the wall of pipeline and tension at grid plate.
The Disease Treatment Measures and Intensification of Reinforced Concrete T-Shaped Girder Bridges
Authors: Yang Ya Xun , Yang Zhi Kui , Qiao Chao
Published: June 2012

Reinforced concrete and Prestressed concrete T-beam bridge are widely used because they have the features of good economy and easy construction in bridge construction. However, with the increase in traffic and the growth of hours of operation, diseases like the increase of the deflection in this bridge,the more cracks,etc.,are being emerging gradually.According to the disease of Chun Ma Bridge while that is being used, we have made a detailed analysis,and proposed purposeful measures to deal with the disease as well as the design to reinforce the bridge,solved the problem of the safety in the bridge operation. This article have made a good in-depth discussion and analysis on the T-beam retrofitting,and it will have a guidance significance for the similar bridges in the future.
Study on Fatigue Resistance Design of A-Alloy Automobile Wheel
Authors: Zhang Bin
Published: June 2012

In this study, a 14×6JJ a-alloy automobile wheel was used as the object, the fatigue strength and lifetime of the wheel suffered from varying amplitude load were predicted with a cumulative damage theory (the modified Miner theorem), which was considered to be accurate and secure, based on the analysis of load spectrum. The predicted lifetime was verified using a reliability theory. The results showed that, the modified Miner theorem was reliable in the prediction of the lifetime of an automobile a-alloy wheel.
Investigation on Preparation and Electrical Properties of Novel Perovskite Cathode Materials Doped with Multi-Elements for IT-SOFC
Authors: Zhao Jie , Kong Ling Long , Li Chen , Ma Yong Chang
Published: June 2012

To develop novel cathode materials with high electrical performances for intermediate temperature solid oxide fuel cells (IT-SOFCs) and optimize the preparation process, perovskite-type oxides Pr1-x-ySrxCayCo1-zFezO3-δ (x=0.1, 0.2; y=0.1, 0.2; z=0.2, 0.3, 0.4; denoted as PSCCF-81182, PSCCF-72173 and PSCCF-62264) were prepared by solid state reaction. The formation process, phase structure and microstructure of the prepared samples were measured using TG-DTA, FT/IR, XRD and SEM techniques. The mixed conductivity of the samples was measured using DC four-terminal method in the range of 150-950 °C. Chemical state of the elements was measured by XPS experiments. The results show that the prepared samples PSCCF-81182, PSCCF-72173 and PSCCF-62264 exhibit a single phase with cubic perovskite structure after sintered at 1200 °C for 6 h. The mixed conductivity of the samples increases with temperature up to a maximum value, and then decreases. At lower temperature, the conductivity follows small polaron hopping mechanism. The negative temperature dependence occurring at higher temperature is due to the creation of oxygen vacancies for charge balance. At intermediate temperature (600-800 °C), the mixed conductivity values of the prepared samples are all much higher than 100 S•cm-1，and can meet the demand of cathode materials for IT-SOFC. XPS tests show that Co and Fe elements in PSCCF-72173 are all of + 3 and + 4 valence. Absorbed oxygen can also be found from the XPS patterns, which is related to the concentration of oxygen vacancies in the perovskite-type oxides.
The Influence of Matrix Concrete on the Strength of Recycled Concrete
Authors: Zhao Huan Qi , Li Guo Zhong
Published: June 2012

Recycled coarse aggregates obtained by crushed concrete were used for concrete production in this study. Four different recycled aggregate concretes were produced; made with 50% of recycled coarse aggregates of four intensity levels. The damage of the recycled concrete is the bond failure of the interface of aggregate and mortar, which is basically the same as the damage process and damage mechanism of the natural concrete. The strength of recycled concrete was influenced by matrix concrete. When the strength grade of matrix concrete is less than C35, the recycled strength of concrete will be inferior to that of natural concrete basically. But when the strength grade of matrix concrete is higher than C35, the recycled concrete strength will be higher than that of natural concrete.
Dynamic Mechanical Properties of Cyanate Ester Resin Modified by Functionalized POSS
Authors: Zhang Zeng Ping , Pei Jian Zhong , Fang Chang Qing , Chen Shuan Fa
Published: June 2012

Different contents of epoxy functionalized polyhedral oligomeric silsesquioxane (POSS-Ep) were used to modify cyanate ester resin. The dynamic mechanical properties of the hybrids were studied dynamic mechanical analysis (DMA). DMA results showed that POSS-Ep tended to decrease E’ of the hybrids at the glassy state but to increase E’ of the hybrids at the rubbery state.
Optimization and Simulation Analysis on Bar Truss System of the Variable Parameters
Authors: Song Chang Li , Ji Jing
Published: June 2012

To meet the given requirements of rigidity and strength of the system and make the system for minimum weight, optimization design of three bar system is carried out by the finite element software ANSYS, The finite element model of truss system is established, loaded and solved and the structure system is optimized using its optimal function module. The truss system optimal combination is given and these can provide a valuable theory basis for similar actual engineering design.
Seam Tracking Monitoring Based on Molten Pool Infrared Images
Authors: Zhen Ren He , Gao Xiang Dong
Published: June 2012

Visual sensors can be used for monitoring the welding seam and seam tracking, but it is difficult to acquire the deviations between the laser beam spot and the weld seam from the images because of the strong disturbances caused by spatters and plume. An extraction method was developed to detect the deviations between the laser beam spot and the weld seam during high power fiber laser welding. Laser welding experimental results showed that the deviations could be detected accurately, and the proposed method can be used to monitor the seam tracking status.
Influence of Lumped Mass on the Natural Frequency of Cylindrical Pipe
Authors: Li Bing , Wei Yu Lan , Zhang Dan , Huang Qing
Published: June 2012

The lumped mass on the cylindrical pipe affects the natural frequency of the cylindrical pipe. The first-three order natural frequencies and vibration modes of the cylindrical pipe with different lumped masses are analyzed by the bending vibration theory and finite element analysis, respectively. The results with different lumped masses are obtained by experiments. As shown in the results, the natural frequencies of the cylindrical pipe with lumped mass are lower than those without lumped mass. The greater the lumped mass is, the smaller the natural frequencies of the pipe are.
Research of Path Control Algorithm the Joint Cotton Bundle Stowage
Authors: Li Jin Liang , Lv Chuan Yi , Ling Si Ying , Wang Zheng Fang
Published: June 2012

Applying structural theories of series connected robot, the joint coordinate series connected robots were finally determined as the design scheme. The basic structural parameters of stowage equipment of cotton bundle were determined on the result from workspace of clamp compared with the room which the stowage was occupied. The controlling arithmetic of stowage equipment of cotton bundle was inferred and educed, which had built the foundation of automatization of system.
Study of Detecting Flaws in a Heavy Bridge-Making Steel Plate
Authors: Luo Hai He , Dong Han Xiong , Dong Zhong Bo , Hong Jun
Published: June 2012

The flaws in a heavy bridge-making steel plate (Q370qE) were detected by ultrasonic test, the types and formation reasons of which were studied by metallographic examination, scanning electron microscope (SEM) and energy dispersive X-ray (EDX) spectrometer. The results showed that the types of the flaws were mainly crack, micropore and inclusion. The formation of crack and micropore was attributed to the center segregation, porosity, as well as the role of structural stress and thermal stress. Moreover, the inclusions were mainly composite oxides (MgO, Al2O3, CaO, etc.) and MnS, the former came from the raw materials and impurity oxides, however, the latter came from the center segregation of the alloying elements. Besides, some improvement measures to reduce detecting flaws were also proposed.
Excavation and Support of Deep Foundation Pit Finite Element Analysis
Authors: Dong Xiao Lin , Han Dong Nan
Published: June 2012

In this paper, sun deep foundation works as background for the pit excavation process are charged to protect the structural deformation and earth pressure traits were studied, and the use of the GTS large-scale finite element software, the actual works in the excavation process in a step-by-stepthe displacement field, the internal force distribution of the analysis, management is deep foundation software and GTS software to calculate the results were compared, focusing on the supporting structure of the deformation and its influencing factors, and come to some meaningful patternsprovide a meaningful reference for similar projects.
Simulation of Underground Water Inrush Spreading Based on Multiple-Phase LBM
Authors: Lu Qiu Qin , Huang Guang Qiu
Published: June 2012

In order to study behaviors of underground mine water inrush spreading, the multiple-phase LBM based on finite-volume particles and point-particles applied to create the LBM-Lagrange simulating model of underground water inrush spreading with silt. The simulation result shows that the model can get the visual information of water-sand inrush speed, water-sand pressure and distribution of water-sand phase. Therefore some effective alternatives can be made to control underground mine water inrush.
Nonlinear System Modeling Study Based on Fuzzy Neural Network with Chaotic Mechanism
Authors: Li Wen , Guo Yu
Published: June 2012

This paper for the shortcomings of conventional BP algorithm which has slow convergence and falls into local minimum easily, the nonlinear self-feedback term with chaotic mechanism is introduced into this algorithm. Thus chaotic BP algorithm (CBPA) is given. The weight of fuzzy neural network (FNN) is trained and learned by using it. Thus an introduction-type fuzzy chaotic neural network (IFCNN) is constituted. Then simulation of nonlinear system based on IFCNN given is proposed. Simulation results show that the designed IFCNN has the same and complex dynamic characteristics with chaotic system, which has good modeling capabilities for nonlinear system.
Test Study on Aerodynamic Performance of Three-Dimensional Stayed Cables in Two-Dimensional Flow Field
Authors: Xue Xiao Feng , Bai Hua , Li Yu , Li Wei , Gong Sai
Published: June 2012

Cables, distributed with diversity spatially angle, are rich in wind direction. Circular cross sectional shape is sensitive to the Reynolds number. This paper studed the aerodynamic performance of three-dimentional stayed cable under two-dimensional flow field in Chang'an University wind tunnel by Pitot tube, electronic pressure scanning valve, data conversion and collection systems. The following conclusions are obtained: (1)The stagnation point and the upper and lower airflow separation point clockwise goes on with the wind angle increases. Absolute value of pressure coefficient at stagnation point and separation point are biggest at 0°wind angle.(2)The absolute value of pressure coefficient at upper and lower separation point increase with the increase of wind speed.(3) Pressure stagnation point,and upper and lower airflow separation point don’t changed with the parameters of helix,while pressures near helix changed irregularlly. Drag coefficient decrease with the increase of helix distance and the deduce of helix height. Meaningful references are provided for the further refinement research on aerodynamic performance of cable-stayed with suppressing vibration measures.
Flow Analysis of Axial Compressor AV63-15 Variable Stator Simulation
Authors: Cheng Wei Hua , Li Mian Chang , Li Chuan Peng
Published: June 2012

This paper conducts numerical simulation to a 15-stage civil axial flow compressor and obtains its main parameters distribution and performance curve by a full three-dimensional viscid flow computation software. The computation result indicates that, the developed axial flow compressor meets the anticipated design requirements, and satisfies the customers’ indicators. Under the designed compression ratio, the difference between the maximum air supply quantity in summer and the minimum air supply quantity in winter is 22%. By comparing the operating conditions and data analysis, obtained the change trend of axial velocity, static pressure and temperature, and Ma, and discovered that, under opening of 48° and outlet back pressure of 550KPa, flow separation occurred on the section of machine set close to hud, which indicated that operating condition was close to surging condition.
The Simulation Analysis of Manipulator Grab the Workpiece Based on PRO/E
Authors: Wang Li Mei , Zhang Li Li , Jiang Dong Hua , Shao Dong Wei
Published: June 2012

The creation method of simulation model of manipulator grab the workpiece is studied based on PRO/E, and the steps how to do the simulation analysis of the manipulator grab the workpiece by PRO/E4.0 software are stated. The results of simulation analysis showed that, in the workpiece quality of 0.08 kg, normal force is about 54.11 N between 0.7 seconds to 7.5 seconds, tangential force is about 0.3924 N between 0.65 seconds to 7.7 seconds, the sum of tangential force of both sides is 0.784 N, it’s exactly equal to the workpiece weight, so that the manipulator can grab the workpiece quickly and accurately.
Fuzzy Linear Matrix Inequalities Control for a Rectangular Thermosyphon
Authors: Qian Kun , Pang Xiang Ping , Yan Hao , Liu Kai
Published: June 2012

This paper proposed a fuzzy Linear Matrix Inequalities(LMI) control strategy for a rectangular thermosyphon. These thermo-fluid-dynamic systems are used to refrigerate heat sources by means of natural circulation of a fluid without mechanical pumping. Two different fuzzy LMI controllers have been designed in order to guarantee closed loop stability, on the basis of a suitable nonlinear T-S fuzzy model of the system. In particular the controllers are designed in order to prevent temperature oscillations, associated with the inversion of the flow direction, which compromise the heat removal from the thermal source. Two different strategies have been adopted to introduce suitable constraints on the control action.
Center of Gravity Fuzzy Systems and the Probability Distributions Based on the Circle Operators
Authors: Yang Xue , Wang Xiao Tian , Yuan Xue Hai
Published: June 2012

In the paper, the center of gravity fuzzy systems and probability representation theory based on two circle operators of the regular implications(Godel, Goguen) are studied. Firstly, based on CRI algorithm and the center of gravity defuzzification method, the joint probability density functions of two-dimensional random variables, the marginal probability density functions and numerical characteristics of these two circle operators are obtained. Then it is pointed out that the fuzzy systems based on these two circle operators are regression functions with the joint probability density function. Finally, we prove these two fuzzy systems not only have the universal approximation but possess the first-order approximation accuracy. By comparing with the center-average defuzzification method, it is found that the center of gravity defuzzification method is better than the center-average defuzzification method.
Properties of Si3N4 Based Nanocomposites Prepared by Pressureless Sintering Method
Authors: Li Ming Li , Yu Qiong , Xu Ying , Lu Qing Guo , Zhou Chun Jiang
Published: June 2012

Si3N4 based nanocomposites were prepared with nano-sized amorphous SiO2 and Si3N4 powders by pressureless sintering method. The microstructures, phase composition, mechanical and dielectric properties of the nanocomposites were investigated. The scanning electrical microscope (SEM) photographs reveal that the grains are big and elongated. The X-ray diffraction (XRD) analysis shows that the main crystalline phase in the composites is Si2N2O formed during the sintering process. More β-Si3N4 phases were retained in the nanocomposites with the increase amount of the amorphous Si3N4 powders and no phase of SiO2 were observed. The densities and the strength of the nanocomposites decreased with the increase of amorphous SiO2 content. Despite low density, the flexural strengths of the composites reaches 220MPa and the ceramic has excellent dielectric properties with dielectric constant as low as 3.2-4.7 and dielectric loss in the range 2.6-3.9×10-3.
Debug and Development of ADAM 6022 Communication in Industry Automation Control
Authors: Li Yu Chun , Liu Xiao Wei , Kang Juan , Gao Fan
Published: June 2012

Automatic communication problem was always difficult for installation of industry supervision control system. ‘3Stages’ debug strategy was proposed and discussed for Adam 6022 in detail in this paper, which was composed by three steps which included address setup, port search and Graphical Condition Logic (GCL) test; and this strategy was proved effective after practical industry application.
Control Types Option Research at Signal Intersection Based on LOS
Authors: Jiang Tian Xiao , Yu Quan , Li Ning , Deng Xiao Hui
Published: June 2012

The intersection is the critical node in city, and has important influence on traffic flow. Whether the intersection is controlled reasonably is the key to the safety and efficiency of the intersection. In view of the current urban intersections lack of signal control mode, typical intersection of Beijing Huairou is selected as main object of study. LOS is chosen as Performance Index, 2000 simulation tests of different levels of demand are designed by using Traffic simulation software, each test is made respectively with pre-timed control and semi-actual control. The Choose figures are given as the base of the intersection control types and comprehensive benefits for intersection analysis.