bluuebunny/crossref_metadata_2025 huggingface dataset:
Research and Design of Data Processing Based on ETL Framework
Authors: Guo Xiao Li , Chen Bo
Published: October 2014

ETL is a key link in the construction of data warehouse. On the base of analyzing the mainstream ETL tool Datastage, the data extraction, transformation and loading, proposes a ETL framework based on data processing, and the realization method and steps are discussed in detail. The framework uses HIVE as a data processing station, improve the operating efficiency of the file; data task according to the E, T and L three parts and hierarchical partitioning, conversion of data users to better grasp the process; development data using the configuration file of the task, the development personnel free out from the heavy code, will to shift the focus of the work to the data logical task, which has greatly improved the efficiency of development personnel data processing.
Research on Software Testing to Ensure Web Application Usability, Reliability and Security
Authors: He Cheng , Liu Yan Fei
Published: October 2014

Compared with traditional web sites, there are some new features on modern web applications, as follows: dynamic functionalities, diverse representation, uncertainty for running performance, innovative data handling and data transferring mechanism, vulnerability Subsequently, the problems in testing web application are discussed from functional testing , reliability testing and security testing. At last, in order to solve these problems,new testing methods are proposed, which are systematic web application testing method,random test methods, reliability testing methods and security testing methods.
Research on the Application of Information Technology in Production Management of Ginseng
Authors: Cai Jian Pei , Yao Yu Xia , Zhang Bo Fu , Bing Dong Mei , Yang Bao Min
Published: October 2014

In order to realize the scientific farming modernization,standardization of production management for ginseng,ginseng production technology using the information technology to knowledge acquisition,cultivation and management,data processing,the effective sharing of information,guidance and training,enhanced the ability of the ginseng plant personnel to solve problems in production management,improving the yield and quality of ginseng,reduce the pollution of the environment.
Study of Wi-Fi Security Basing on Wireless Security Standards (WEP, WPA and WPA2)
Authors: Jiang Zi Gui
Published: October 2014

Wi-Fi becomes increasingly popular for people who use smart phones, tablet computers and laptops frequently. It is essentially for users to understand the security problems of Wi-Fi in order to prevent information leakage. The key wireless security standards used in IEEE 802.11 are WEP, WPA and WPA2. The main purpose of this paper is to investigate the security vulnerabilities of these three standards and attempt to conclude an optimal solution for common users.
An I/O Fault-Tolerant Method Based on Application-Level Agent in Object-Based Storage System
Authors: Zhang Wei , Liu Zhi Long , Zhou En Qiang , Lu Yu Tong
Published: October 2014

The fault-tolerant ability of an object-based storage system is an important factor that affects the reliability and usability of the entire system. Existing fault-tolerant methods either increase procurement cost, or impede performance. In this paper, we propose an I/O fault-tolerant method based on an application-level agent, which can perform fault-tolerance swiftly and efficiently at runtime by constructing the fault-tolerant agent’s execution engine. We consider a “disk full” exception as an example to further detail the implementation of this method. Experimental results confirm the method’s effectiveness.
Struts2-MVC Based Design of Mobile Supervision System
Authors: Wu Shi Feng , Zhong Luo , Hu Man Li , Zhou Fan , Song Hua Zhu
Published: October 2014

The Supervision System is one of the important components of the Construction Engineering Information Management. This paper proposed the system’s design with the Struts2 and MVC framework based on the android mobile platform. First of all, it gives the E-R model and data design in the system. Then, it gives the overall architecture of the system in which the android client uses MVC framework while the Server-Client uses Struts2 framework that is responsible for the separation of MVC and the jump of the business layer. Besides, for the communication protocol between the Client and the Server, it adopts the HTTP service and Socket service, and uses JSON as a data interchange format. In the end, the UI design of each module in the system is given.
Application and Research of Instruction Serialization Technology in the Simulation Test System
Authors: Yu Ai Rong , Wang Jun , Ye Xu Guang , Chen Guo You
Published: October 2014

The process of converting a data structure or object state into a storable format is referred to as serialization. For the simulation of complex electromagnetic interference test environment, to evaluate the ability of the communication system, based on the semi physical simulation test environment, this paper presents a kind of instruction serialization mode based on TCP protocol as the data transmission and control scheme of multi device control, design and implementation of various types of equipment centralized monitoring framework for the realization of all kinds of network communications equipment and status data centralized testing and monitoring purposes, to achieve a data device management control process is accurate, real-time transmission.
Research Paper Influence Measurement and Applications: A Machine-Learning-Based Approach
Authors: Du San Shan , Wu Yue Chun
Published: October 2014

Measuring the influence of academic research publication is an meaningful work in academe. In this paper, the co-author and the citation networks are built to calculate the influence of a researcher and a paper in the way of networks separately with the discussion of further applications. At the beginning, the co-author network is built to determine the influence of co-authors. Then, based on the citations among the papers in the database, we build up the citation network with the help of graph theory. Thirdly, the method is implemented with the application of American Airline network analysis. As the final, the analysis of strengths and weaknesses is conducted.
A Load Balancing Mechanism for Video Surveillance System
Authors: Pan Jin Xue
Published: October 2014

In recent years, with the development of video surveillance systems, the cluster and load balancing technology need be applied to improve the system performance and the quality of service. In this paper, on the basis of common load balancing algorithms, considering the characteristics of the video surveillance system, design a new load balancing scheduling mechanism, by improving the weighted round robin algorithm and introducing the nodes cooperation strategy. The testing results show that the new mechanism can distribute the loads more reasonably and make use of the server resources more effectively.
Digital Modulation Recognition in Different Environments
Authors: Li Rong
Published: October 2014

For the using of multi-modulation, the precondition of receiving and demodulating signal is to determine the type of the modulation, so automatic recognition of modulation signal has significant influence on the analysis of the signals. In this paper, digital modulation recognition is studied respectively in different environment of White Gaussian Noise (WGN), stationary interference and multipath interference. The simulation results show that the recognition success rate is the highest in stationary interference environment and the lowest in multipath interference environment with the same signal to noise ratio (SNR).
A Pulse-Based 60GHz Ranging System
Authors: Wang Min , Zhang Hao , Lu Ting Ting
Published: October 2014

60GHz signal has very high time resolution and multipath resolution, thus having the potential of achieving high accuracy ranging and positioning at centimeter level or even millimeter level. This technology has great application value in fields like indoor robot navigation, hazardous area monitoring and accurate positioning. In this paper, after designing the pulse-based 60GHz wireless communication system, we proposed a pulse-based 60GHz ranging system. Theoretical analysis and simulations demonstrate that the proposed system can achieve good ranging performance.
The Design of Improved Elman Network Intrusion Detection Algorithm in Digital Campus Network
Authors: Wang Jing Jing
Published: October 2014

With the development of digital campus network users, web users exhibit scale up, the campus network users to use different computer level each are not identical, uneven, a potential threat to network is more serious, campus network security has become an urgent need to solve the problem. In this paper, based on the neural network, the concept of Elman memory, and proposed an improved algorithm of Elman neural network, the realization of network intrusion detection. The experimental results show that, the algorithm can effectively improve the accuracy of network intrusion detection algorithm.
Research on the Present Development Status and Path Construction of Domestic E-Government
Authors: Li Geng
Published: October 2014

E-government is a new approach for technology management and governance, with the advantage of optimizing workflow, improving government efficiency and promoting openness and transparency of government operations and so on, which is helpful for establishing a service-oriented government. It is widely used in developed countries; however, the construction of domestic E-government faces some problems, such as, talent shortage, insufficient fund, unclear understanding and lacking of information sharing. In order to better promote the construction of E-government, we need to strengthen the awareness of information services, broaden the multi-channel investment, strengthen specialized personals’ training and focus on integration of information resources.
Structural Design of Mountain Tunnels in the 3rd Pipeline Project of Natural Gas Transmission from West to East China
Authors: Zhou Xiao Jun
Published: October 2014

This paper mainly summarizes the structural design of mountain tunnels used to lay natural gas pipes in the 3rd pipeline project of natural gas transmission from west to east China according to the main requirement of laying gas pipes in mountain tunnels supported with concrete lining in light of geological conditions of surrounding rock, the designed parameters for tunnel lining are presented and meanwhile, the installation of gas pipe is also illustrated in the paper. The type of laying gas pipe and designing of tunnel support in mountainous regions proposed in this paper can provide practicable guidance to the design and construction of oil and gas pipe tunnels under similar circumstances.
Design of Municipal Tunnel for Public Utilities to Cross Urban River with Open Cut Method
Authors: Zhou Xiao Jun
Published: October 2014

On the basis of ground geology and hydrogeology of an urban river, a municipal tunnel in which public pipes and cables are placed is designed to cross the river by means of open cut method. The main structure of the municipal tunnel and its waterproof measures are both summarized in this paper. Reinforced concrete frame structure with one story and three box-shaped sections is used in the design of the municipal tunnel. Both self-waterproof structure and waterproof sheet are applied to prevent ground water from permeating into the subaqueous tunnel. The installation of public cables and pipes are still elucidated in the paper. The typical structure of the municipal tunnel can be a guiding reference for the design of other subaqueous tunnel to cross urban rivers under analogous conditions.
Research on Criterion and Prediction of Surface Defects in Alloy Steel Casting Slab
Authors: Li Xin Cheng , Tang Yong Chun , Zhu Wei Xing , Liu Jie , Wang Xiao Li
Published: October 2014

To effectively control all types of surface defects in alloy steel casting slab, quantitative characterization must be taken. Thus, corresponding quantitative characterization criterion of various casting slab surface defects was established firstly in this paper. Mapping relationships between casting process parameters (like carbon content, slab thickness, casting speed, depth of submerged nozzle, water ratio of secondary cooling, and so on) and surface defects, and simplified surface defect prediction model of alloy steel casting slab were established by using Partial Least Squares Regression. Application results indicated that the prediction results of surface defects highly coincided with casting production situation, which fully verified the applicability of the prediction model.
Mechanical Analysis of Tunnel Steel Frame with Steel Frame and Sprayed Concrete Combination Model
Authors: Sun Zhi Jie , Xue Xiao Hui
Published: October 2014

To research the mechanical regularity of steel frame in tunnel, Steel frame and Sprayed concrete Combination Model is applied and the large-section loess tunnel of highway is taken as an example. The hoop stress of flange and the radial stress of web were analyzed, the research results show that:The most areas of hoop stress of flange is in press, the compress value which most areas of flank edge is larger than the outer flank flange in the same area of steel frame. The hoop and radial stress of web is in press. The hoop stress value which most areas of flank edge are larger than the radial stress in the same area of steel frame.
Finite Element Analysis on Hysteretic Behavior of Aluminium Columns under Cyclic Loading
Authors: Zhang Zheng , Zheng Yong Qian , Chen Xue Chao , Wang Zhi Bin
Published: October 2014

The mechanical properties of axial compression aluminium members under cyclic loading were studied and compared with those of steel columns. In order to proceed to theoretical study on hysteretic behavior of aluminium columns, a method by finite element analysis was proposed. The method was based on FEA software, ANSYS. The analysis methods considered the effects of material nonlinearity, geometrical nonlinearity and initial imperfection. On this basis, hysteretic curves, reversal skeleton curves and stiffness degradation curves of 6061-T6 aluminium columns, 6061-T4 aluminium columns and Q235 steel columns under axial cyclic loading were obtained and compared. Results show that the hysteretic behavior of the aluminium columns is similar with the low carbon steel columns and is significantly influenced by constitutive relationship.
Experimental Research on Calculation Parameters of GFRP Bars Tensile Strength
Authors: Jin Qing Ping , Zheng Zu Jia , Xiao Liang Li
Published: October 2014

A tensile test on the 18mm diameter (φ18) and 25mm (φ25) GFRP bars was conducted to observe the tensile apparent characteristics and failure strength. The value calculated by failure strength fomula and the experimental value were ,contrasted to study the parameters and value of the strength calculating formula,, and drawn the conclusions as follows: The φ18 and φ25 GFRP bars' failure strength is effected by fiber materials, enhance materials itself and interface performance. The φ18 bars’ failure strength is about 10% higher than φ25 bars’. The deviation between the calculated value and the actual value is more than 30%. k is the correction parameter in theoretical formula, kφ18=0.76, kφ25 = 0.68 is appropriate. Based on statistical intensity distribution model of GFRP bars’ failure strength, reference stresses value of the φ18 and φ25 GFRP bars are different and the diameters of GFRP bars increases to weaken the strength of the composite material. The reducing rate of the reference stresses is significantly affected by the diameters. The diameters effect is greater than the fiber content effect.
Stability Studies of Tailings Dam Based on the Geo-Studio
Authors: Song Zhi Fei , Tian Bo , Wang Qun
Published: October 2014

The tailings dam safety situation is not optimistic in our country, the accident of tailings dam do great harm to people's safety and state’s property. In this paper, based on methods Sweden arc method and Bishop method which were written in the latest tailings dam design specification. Firstly, the paper verifies the security of the tailings under the normal working condition. Secondly, the paper simulates the flood of dam body seepage field and sliding field contours on the assumption of multiple conditions, coming out the safety coefficient. Finally, the author put forward many control Suggestions and measures for the safe operation of the tailings.
Research on Controlled Release Technology of the Anti-Icing Modifier in Asphalt Mixture
Authors: Tian Miao Miao , Cao Yan Hua , Jiang Rui Nan , Zhu Bao Lin , Ling Gui Xiang
Published: October 2014

The agent with a function of controlling the release rate of the anti-icing modifier used in the asphalt mixture was researched in this paper. The purpose is to make the salt components’ release rate controllable and extend the usage life of the anti-icing modifier. Apply the “Rapid Determination of Chloride Ion Content Instrument” to assess the release rate of the different agents. Research and analyze the impact on the anti-icing modifier’s durability brought by the different agents.
The Preservation Research of Traditional Houses of Tujia Minority in Western Hunan - Taking the Market Town in Huochang Tujia Township as an Example
Authors: Dai Bei Lei , Liu Hong Tao
Published: October 2014

With the high-speed development of urbanization and the strengthening of new countryside construction, traditional houses of Tujia minority in western Hunan are facing a severe test. Nowadays, it has become a difficult problem that how to make the vanishing traditional houses not only get effective preservation but also can continue to use for residents. This paper takes the architectures of Huochang Tujia Township, Yuanling County in western Hunan as an example, through the analysis of the existing situation of the architectures of market town, puts forward some measures of preservation and renovation.
The Adaptation Analysis of the Fully Mechanized Coal Mining Face of Huopu Mine’s Third Soft Coal Seam
Authors: Liu Fa Quan , Geng Xue Wen , Che Yong , Cui Xiang
Published: October 2014

To get the maximum coal in front of the working face of the 17# coal seam, we installed a longer beam which is 1.2m in length in the leading end of the original working face supports ZF3000/17/28, and know that working face supports’ setting load and working resistance are lower .We changed the original supports with shield supports ZY3800/15/33 that are adaptable in the geological condition and got the favorable affection.
The Analysis of the Composite Beam in the Earthquake Response by the Finite Element
Authors: Yu Bao Chu , Wang Gong Dong
Published: October 2014

By large-scale finite element software ANSYS, the seismic response of large span steel - concrete composite beams were analyzed, to get the change rule of the deflection and stress of the design. And analysis of the extension of design parameters for influence factors, such as concrete grade, reinforcement ratio, the height of steel beam, is to get their effect of the seismic responses of the composite beam deflection and stress, and provide powerful basis for optimal design of composite beams. For the model in the interface by setting the three direction spring element to simulate the interface slip and vertical uplift, and choosing three directions of EI Centro seismic wave including relatively rich spectrum as input, the result of analysis is relatively accurate.
The Ecological Utilization of the Wood of Guangxi in the Local Minority Ethnic Architectural Environment
Authors: Zhu Wen Shuang
Published: October 2014

Analyzing the use of wood in the folk houses of Guangxi Province, this paper tries to probe into the ecological and cultural value of wood of Guangxi, aiming to find a green pathway to the ecological, environmental friendly lifestyle.
The Effect of the Secondary Dead Load on Vibration Characteristics of a Steel Box Girder Footbridge Model
Authors: Zhang Ju Bing , Zou Ying , Zhang Shao Xia
Published: October 2014

Making field test and finite element simulation on East Third Ring Road Xiaobawang footbridge in Beijing, considering the effect of the deck loads of the bridge on the model calculation results, we can find the effect of the secondary dead load on vibration characteristics of the footbridge model. Comparison of the frequencies of model before and after applying the secondary dead load make us know that applying dead load will lead to the lower frequency of bridge. In the process of the bridge finite element analysis, factors to consider should be more comprehensive and the way to simulation should be more realistic so that the results of finite element simulation can be closer to the actual.
Research on the Crack Detection of Subway Station Double-Layer Framework Structure Based on ANSYS
Authors: Gong Jing Min , Ma Juan
Published: October 2014

By introducing the basic theory of finite element method and commercial software ANSYS, the coupling field modeling theory, according to the structure of three point bending test to establish the finite element model for the electric and mechanical coupling field simulation test structure. At the same time, with the change of load structure deformation, due to smart layer piezoresistive effect, its potential changes, which can be implemented using intelligent layer resistivity changes of structural damage detection and monitoring.
Study on Preparation and Mechanical Properties of Magnesium Phosphate Cement
Authors: Liu Run Qing , Chen Ding Qiang , Hou Tian Bo
Published: October 2014

The orthogonal experiment method is utilized in this paper to get a comprehensive analysis of the compressive strength of magnesium phosphate cement (MPC) to prepare the cement with the best performance. What’s more, a further study is conducted on the compressive strength of paste and the compressive strength and the flexural strength of mortar, and the last is the adhesive properties. The results showed that the optimal ratio was obtained; the setting time of the optimum mix ratio of cement is 13min, which meets the requirements of rapid repair; the development of the strength of the paste and mortar all have the characteristics of early strength and fast hardening. Generally, the strength at 7d can reach the 90% of the strength at 28d, and the compressive strength of the paste at 28d can reach to 79.8MPa. The compressive strength and flexural strength of mortar at 28d are 53.2MPa and 11.3MPa, respectively.
Sulfur Dioxide Was Carried out by Activated Carbon Adsorption in Combination with Microwave Desorption in Scene
Authors: Peng Si Yi , Wang Jian Hong , Ma Li Ping
Published: October 2014

The desulfurization of low-concentration sulfur dioxide in laboratory simulated flue gas and on-site metallurgical flue gas was carried out by activated carbon adsorption in combination with microwave desorption. In comparison with the results of desulfurization, the effect of gas impurities in on-site metallurgical flue gas on the performance of activated carbon adsorption and microwave desorption, as well as the consumption of activated carbon during the desorption process, was also studied. The results show that the gas impurities decrease the unit adsorption capacity by 28.73mg/g and increase the consumption of activated carbon by 0.25g, thus go against the adsorption of activated carbon. Moreover, the use of on-site flue gas as microwave carrier gas in the desorption process can benefit the accumulation of medium-or high-concentration SO2 from the desorption process which can be used to produce acids.
The Stability Monitoring of High Fill Soggy Railway Embankment in Chongqing Steel Plant
Authors: Su Qian , Yao Jun Kai , Hao Jia , Sun Wen
Published: October 2014

Based on the special section of high fill soggy embankment in Chongqing Steel Plant Railway, we successfully implemented high fill soggy embankment’s dynamic stability monitoring by laying high precision measuring instruments inside the embankment. This stability monitoring reveals the changes and rules of the lateral horizontal displacement, layered settlement, internal stress of this particular form of embankment and provides references for designing and construction for high fill soggy embankment in mountainous area.
Analysis of Bridge Pier’s Dynamic Characteristics Considering Fluid-Solid Interface Coupling
Authors: Jin Chen Hui , Zhao Bo Ming , Bai Run Bo
Published: October 2014

In the study of bridge pier’s dynamic characteristics, the modal analysis is the foundation of other dynamic analysis and is of great significance for studying other dynamic performance. Based on the dynamic theory of fluid-solid interface coupling, a 3D water-structure coupling finite element modal is established and computed by ANSYS. To verify the validity of the calculation results, the results of finite element software is compared with the analytical solutions in reference books. The analysis indicated that the results of finite element software are reasonable when the radius of bridge pier is five times the radius of water body. The ratio of water depth and the bridge pier’s height has a great influence on the change scale of bridge pier’s frequency. With the increase of bridge pier’s height-diameter ratio, the first three order natural vibration frequency is reduced.
Modeling of Steel Bolted T-Stub Connection under Large Deformation Condition
Authors: Zhang Jin Fan , Wang Zhen Yu , Jiang Jian Qun
Published: October 2014

Based on the component method of EuroCode3, a new component model to evaluate properties of T-stub connections under large deformation condition has been proposed in this paper. Firstly, the T-stub connection was breakdown into several components. And then those components was equivalent to bilinear springs. Finally the multi-spring model of T-stub connection was set up to describe its load deformation behaviour. With the purpose of verifying and calibrating the proposed model, a series of case studies were carried out and corresponding finite element models has also been set up. Results of FEM and multi-spring model fit well each other. And the applicability of the proposed model can be testified by the parametric study. The method of this paper can describe the behaviour of T-stub connections under large deformation condition, which can be a useful improvement to conventional design codes.
The Comparison and Analysis of the Fuel Extracted Chlorine Detection Methods in Refuse Incinerator
Authors: Li Shi Ping , Yang Bo , Li Mao Dong , Wang Xiao Cong , Zhang Hui , Lin Jin Mei , Yu Ai Zhi
Published: October 2014

High temperature chlorine corrosion problems in refuse incinerator get more and more attention in recent years. At present, there is no uniform method of detection of chlorine. In this paper, three common detection methods are introduced. Combined with quantitative experiment, the detection effects of these three detection methods are compared.
A Heuristic Link Selection for Radio Frequency Tomography Based on BCS: Principle and Method
Authors: Hao Xiao Xi , Guo Xue Mei , Wang Guo Li
Published: October 2014

Radio tomographic imaging as a coarse computational imaging method has attracted much attentions due to its potential applications in human surveillance. It utilizes the shadow fading characteristics of radio signals among wireless sensor network nodes to infer the targets' localization. The recovery process involves a large number of scanning links, which brings heavy burdens on node energy, communication routes and data storage. In general, there is a small number of targets and could be seen as a sparse signal compared with the original high-dimensional space. Hence, the key of scene recovery is the effective links selected. This part of work presents a heuristic link selection for radio tomographic localization system, which introduces a Bayesian compressive sensing (BCS) to heuristic link selection method for scene imaging reconstruction.
A Heuristic Link Selection for Radio Frequency Tomography Based on BCS: Application
Authors: Hao Xiao Xi , Guo Xue Mei , Wang Guo Li
Published: October 2014

Radio tomographic imaging as a coarse computational imaging method has attracted much attentions due to its potential applications in human surveillance. It utilizes the shadow fading characteristics of radio signals among wireless sensor network nodes to infer the targets' localization. The recovery process involves a large number of scanning links, which brings heavy burdens on node energy, communication routes and data storage. In general, there is a small number of targets and could be seen as a sparse signal compared with the original high-dimensional space. Hence, the key of scene recovery is the effective links selected. As the continuation of the previous part of work, this part of paper presents experimental studies indicate the proposed method is able to obtain better accuracy under the same number of measurements compared with the existed method. Numerical applications of proposed model are illustrated as well.
Analysis of the Electrically Driven Compressor for New Energy Vehicles
Authors: Li Chuan Wu , Wang Xian Yan
Published: October 2014

The new energy electric bus has already been used for many years; however, it is also not strange that there are problems in the actual operation process. Base on the running status of new energy vehicles during the early stage, this article provides some opinions on problems of using electrically driven compressor, which is mainly stated oil carryover and vibration noise of several kinds of electrically driven compressor and enumerated the partial performance of the compressors. After all, the behavior of compressor will not only directly affect the braking safety performance, but also had a greater influence on the Sequential maintenance costs.
Research and Realization of Power System SVG 3D Render Engine Named PSSRE
Authors: Pan Li Jie , Fang Yu
Published: October 2014

According to the problem of power network visualization system which has the poor effect in 2D style and the limitation of visual effect in 3D style, setting geographical SVG as research target, and introducing virtual reality platform as basic simulation environment, designing and realizing power system SVG 3D render engine named PSSRE. The design and implementation of parsing module and rendering module are analyzed as well as three-layer render architecture and representation method of layered grid structure. The results show the efficiency of PSSRE.
Laying Scheme Design of Solar Photovoltaic Cells about a Single House
Authors: Yao Zhi Peng
Published: October 2014

In consideration of the generated energy per unit area as large as possible and the expense of generated energy per unit as low as possible, this paper has proposed optimization selection method for the types of solar panels about six surfaces of the single house which receive solar radiation,the solar panels series and parallel connection and the invertors. The final laying scheme has been obtained through the synthetical evaluation of the optimization results about six surfaces .
Research of New Type Velocity Modulation System Based on Extra Power of Rural Grid
Authors: Wang Ying Hai , Zhang Hao Ming , Peh Lian Soon
Published: October 2014

Rural grid has large waste for its discontinuity in application. Li-ion battery, with feature such as small size, large power density, high single voltage, low self-discharge rate, low inner resistor and so on, has been applied in power storage system. The intelligent power storage system based on li-ion battery and super capacitor can effectively storage the extra power in the period of grid off-peak, and also could absorb the feedback energy when the velocity modulation system is braking, largely increases the use rate of energy storage.
Study on Regenerative Braking of HEV Based on ADVISOR
Authors: Wang Ying Hai , Zhang Hao Ming , Peh Lian Soon
Published: October 2014

Much energy was created when hybrid electric vehicle braked down, Battery storage system can not absorb the energy efficiently due to its limitation, which caused energy waste. Regenerative braking system with super capacitor based on TMS320F2812 was brought forward in order to solve the problem, ADVSOR simulation results prove the system can improve battery’s performance and reduce engine emission pollution greatly.
The Factors Affecting Accuracy Rate of Power Load Forecasting in Summer
Authors: Chen Yan Ping , Chang Yan Li
Published: October 2014

This paper analysis the low power load forecasting accuracy in summer deep. It found the factors affecting accuracy rate of power load forecasting in summer, and proposed the measures to increase the load forecasting accuracy.
The Research on Application of 1000Mw Unit Boiler Safety System
Authors: Zheng Yue Xia , Li Hui Qiang , Wang Xu Hui
Published: October 2014

1000MW thermal power the first one million kilowatts unit project, in central China. It is also China's first with "big pressure on the small" approach approved one million kilowatts unit project, its safe operation of boilers has important significance. This article describes the FSSS boiler protection system debugging, application of 2*1000MW units Unit 1, from system debugging, maintenance, use, etc. It should be noted that some of the issues rose for the technical officers.
A Wavelet Analysis of Three-Dimensional Surface Vibration Signal of Running Power Transformer
Authors: Ding Qiao Lin , Yuan Yi Min , Li Zhong
Published: October 2014

Theoretical analysis and practice experience have shown that, the vibration signal on power transformer surface can be used to analyze and judge the work state of the winding and iron core. For vibration analysis, to extract a precise feature of the vibration signal is a basic work. Based on wavelet multiresolution analysis, three-dimensional surface vibration signal of the running power transformer is analyzed. Based on the Parseval theorem, the feature of frequency bands-energy in X, Y, Z directions is computed and compared. It provides some reference for the power transformer vibration analysis.
Implementation of the Variable Center Frequency Band-Pass Filter Based on FPGA
Authors: Hu Dan Hua , Zeng Zhao Xiong , Meng Jing Song , Zhang Chang Hua
Published: October 2014

Digital band-pass filters play a very important role in instrument design. For some special applications, such as corrosion inspection of buried oil or gas pipeline, more than one band-pass filter with different center frequencies are needed to process different frequency signals. FPGA (Field-Programmable Gate Array) are widely used in these applications because of its high compute velocity and flexibility. For low cost and high reliability purposes, it is expected that one digital filter with a fixed configuration parameters can serve as multi different center frequency digital filter. In this paper a design method is proposed to realize two different center frequency band-pass filters which have the same filtering effect. Through analysis of design process for FIR band-pass filter, it’s easy to find that if the ratios (filter’ sample rate of input data to its cut-off frequency) of two filters keep equal, the normalized frequency will also equal. Thus according to this, two band-pass filters can have the same coefficients only if they have the same ratio of sample rate to cut-off frequency. This relationship is discussed here and MATLAB experiment is used to prove its effectiveness. This method is already used to design filters in pipeline current mapper instrument to inspect pipeline corrosion.
A Low Noise CMOS Digital Output Interface Circuit
Authors: Xu Hua , Qiao Zhe
Published: October 2014

A digital CMOS output interface circuit is proposed, which lowers down the peak and lengthen the duration of the pulse of current supplied by the power supply to reduce the SSN (simultaneously-switching noise) effects. The simulation shows that the maximal SSN voltage of the proposed circuit is 331.5mV compared to 662.4mV of the traditional one.
Automatic Navigation of Intelligent Vehicle Control System Based on Laser Sensor
Authors: Han Yong Qi , Liu Yi , Lin Nan
Published: October 2014

This smart car control system by MC9S12G128 controller as the core, the use of a row of 18 laser tubes and 6 receiving tube as the path recognition sensor, through MC9S12G128 I / 0 interface for sensor signal, and use the feature extraction method to extract the track type, realization of the starting line, cross line recognition. According to road information, the design adopts fuzzy control algorithm of output PWM wave to control the gear steering, complete control of the direction of the car, the car speed extracted with the use of photoelectric encoder, comparing with the current set point to get speed deviation, and output PWM pulse is obtained by using the PID algorithm to control the motor to adjust the car speed, complete the closed-loop control of the car movement speed. Through the experiment, the system is designed to achieve the desired effect.
Study on Fault Diagnosis of Power Transformer with Reduction Method of Attribute Significance
Authors: Lv Hong Li
Published: October 2014

This paper studies the power transformer fault quality diagnosis using rough sets theory and neural network. It is rough sets reduction as the pre-unit of neural network based on reduction algorithm with the attribute significance. The paper describes the reduction algorithm and implementation method detailed. Through the training and testing results with practical data, it is proved that the reduction algorithm with the attribute significance can make the number of input samples shorter, the training speed faster and the diagnostic accuracy higher. The algorithm is feasible and effective for applying to the fault diagnosis system of power transformer.
Interference Lithography Patterned Nanogratings in LiNbO3 Fabricated by Dry Etching
Authors: Gu Qiong Chan , Jiang Xiao Xiao , Lv Jiang Tao , Si Guang Yuan
Published: October 2014

Channel waveguides have been fabricated in x-cut lithium niobate (LiNbO3) by proton exchange (PE) method and optically measured. The thickness and the optical constants of the thin PE layer were characterized using a prism coupling technique. The PE area was plasma etched and a 2.775-μm total etching depth was achieved. The measured average etching rate is 92.5 nm/min. One-and two-dimensional dense arrays of LiNbO3 nanostructures have also been fabricated by using interference lithography (IL) and inductively coupled plasma reactive ion etching (ICP-RIE) techniques.Intorduction
Simulation Study on Three-Phase Three-Wire System Low Voltage SVG in PSCAD
Authors: Hu Shao Gang , Gao Da Yong , Wang Shu Han , Wu Lian Zhi , Li Hong Sheng , Chen Jia Yong , Cai Bo
Published: October 2014

Among the current 3G SVCs, the one with the highest compensating capacity is the static var generator, which is featured by smooth and continuous bipolar reactive power, quick responding and small loss, and widely applied in petrochemical, metallurgy, wind power and power transmission and distribution, etc, working out power quality problems. As demand for static var compensators in market grows, LV SVG comes to the stage. Compared with HV and MV SVGs, although LV SVG is simple in structure, it has stricter requirements on compensating capacity and stability, which requires R&D to consider more technical details in product design.
Protection System Design of Overload, Short Circuit and Three-Phase Imbalance for Electromagnetic Starter in Coal Mine
Authors: Mao Qing Hua , Ma Hong Wei , Xing Wang , Liu Yu , Zeng Min
Published: October 2014

An intelligent protection system of electromagnetic starter in coal mine was designed. Its controller core is PLC LM3108K. The voltage rank of protection system is 660V and the electric current rank is 400A. It has protection functions for overload, short circuit, break phase and three-phase imbalance. The system achieved overload protection by using the method of inversing time overload. Greater the overcurrent is, Shorter the time of protective action is. The system achieved short circuit protection by using phase sensitive protection method, which improves sensitivity and reliability of short circuit protection. The system can display work status parameters and fault types timely by text LCD. It has the advantages of hardware circuit structure flexibility and automatically reset after fault relieved.
Natural Aging Mechanics Characteristics on Fiber Reinforced High Altitude Airship Envelope Composite
Authors: Gu Yun Chao , Liu Long Bin , Cao Shuai , Xiao Hou Di , Lv Ming Yun
Published: October 2014

For High altitude airship (HAA) with long time affected by space harsh environment, due to the occurrence of natural light radiation aging physical and mechanical properties, fiber-reinforced airship envelope material results in degradation of the mechanical load performance, even causing damage to the balloon airship. Based on the ground aging simulation of the airship envelope material under the natural light, the morphology of airship envelope material in the natural aging process can be observed and the specimen comparison test is carried on for its fracture strength and breaking elongation to qualify its mechanical properties. The specimens with the axial angle of 0°and 90°were respectively tested to get its mechanical properties and the comparative analysis on degradation of fracture strength and breaking elongation before and after its 720h aging is developed too. The test results shows that the mechanical properties of different specimens decrease, wherein the maximum degradation is 0° specimens and that of 90°specimens t is not very significant weakening. Natural aging characteristics of airship envelope material provide support for the design and improvement of anti-aging properties of the airship envelope material.
The Design of Substation Electrical Simulation
Authors: Shang Li Qun , Liu Xiao Fei , Lv Dou Niu
Published: October 2014

In this paper, the substation electrical simulation system was designed on the MCGS development platform. The designs include simulation system interface design, database establishment, component modeling, and operating process design. The simulation system not only can simulate the substation switching operation and the fault, but also has the functions of real-time data, historical data and alarm records. The designed simulation system is simple, clear, and easy to use. It can be applied to the teaching and training of the substation operator.
Research of Probability Distribution of Semiconductor Test Parameter
Authors: Zhang Kui , Zhao Hong Dong , Shen Tong Xi , Huang Jie
Published: October 2014

The probability distribution of electrical characteristic parameters of semiconductor device is an important reference which is used to analyze the reliability and quality consistency of devices. These distributions are considered as normal distribution at home and abroad. This paper utilized mature GaAs MESFET low noise amplifier as analytic sample which is volume production and wide application, and used high-precision Agilent B1505A device analyzer to test main electrical characteristics of 408 samples. After the distribution generation of test results, the Skewness-Kurtosis method was used to analyze probability distributions of the results. At last, the conclusion of distribution of measuring parameter is non-normal distribution was educed.
Study on Crack Tearing Propagation of High Altitude Airship Envelope Composite Material
Authors: Cao Shuai , Gu Yun Chao , Xiao Hou Di , Mi Pan Pan
Published: October 2014

High altitude airship (HAA) envelope material is vulnerable to be damaged and become failure with the long floating time in the space while withstanding severe and bad high space environment. HAA envelopee is composed of fabric laminated composite and the fabric yarn bundles are the main part to bear outer loads. Also the main bearing part is woven by Kevlar filaments and it is valid to analyze its mesomechanical properties as two-dimensional textile material. On the basis of yarn bundles mechanics, the paper considers the elastic and plastic deformation and collides among the bundles for its analysis. And the mesomechanic model is built to explore mechanisms on tearing propagation of pre-notched envelopee material samples. The results from the model computed by program language Matlab are compared with the test data for the same model. The comparative results are almost line with what the engineering requires.
DC Motor Drive Control Circuit Design Based on IR2103S High-Power Wide Voltage MOSFET
Authors: He Xun Lai , Hong Qing , Ma Jiu He , Yu Wen Wen
Published: October 2014

Based on IR2103S half-bridge drive chip, high-power wide voltage DC motor drive circuit is successfully designed. This paper analyses high power wide voltage DC motor drive control principle, H-bridge drive principle, control characteristics of MOSFET and drive method, moreover, this paper also introduces operating characteristics of wide voltage IR2103S half-bridge drive chip and its control logic and operation modes, in addition, it provides interface method for connecting IR2103S chip and single-chip microcomputer, and measures to control high-power wide voltage DC motor by the single-chip microcomputer.
Research of AGV Variable Frequency Speed Regulation System Based on New Type PMSM
Authors: Wang Ying Hai , Zhang Hao Ming , Peh Lian Soon
Published: October 2014

Halbach motor is a new type permanent magnet synchronous motor: unique permanent magnet structure makes its magnetic field unilateral and distributed sinusoidal, increases the magnetic density of air gap while decreases the magnetic density of rotor. It helps to raise the power density and efficiency of power, reduces the size of motor and the pulsating torque. The full-digital variable frequency adjustable speed AGV system with halbach motor based on the TMS320F2812 is designed, and its experiment result proves that it performed well and environment-friendly, saving the energy as well.
Application of Feedback Linearization to the Controller of CSTR
Authors: Zhu Lan Xiang , Wang Zhen , Yu Ding Li , Yang Wei Wei , Gu Lei , Zhang Li Zhe , Liu Qi Fan
Published: October 2014

Based on input-output feedback linearization scheme using the theories of differential geometry, this paper designed a controller for the continuous stirred tank reactor system which is a typical nonlinear, multi-variables, time-varying system. First, continuously different the chosen system outputs until control input appear in the expression. Then, overall linearization can be realized by input variable-substitution if some conditions are satisfied. At last, mature linear control theory is used to control the sub linear system stable. Simulation results show that the proposed control scheme is efficient and the system contains good static, dynamic performance.
Design of Manipulator Data Commutation System Based on PLC
Authors: Liu Guo Xin , Liu Shu Long , Bai Er Jing
Published: October 2014

The method to realize the communication between PC and SIEMENS S7-200 series PLC is introduced through MSComm ActiveX and RS-232 serial communication protocol under VB development environment, and it is explained that the application of this way in the control system of the manipulator in detail. The focal point of introduction is about the function setting of special registers and MSComm ActiveX on VB under free-port communication in PLC, and the way to write program is described to realize receiving and sending the data of PLC.
Grey Correlation Analysis of Chery A3 Automotive Air Conditioning System
Authors: Wang Fei , Yu Quan Yu , Pan Ya Wei
Published: October 2014

The gray correlation analysis model of the Chery A3 automotive air-conditioning system (SQRWXJS-A308) was established. Gray theoretical analysis method was used to analyze the grey correlation grade of four kinds air-conditioning system development plans, we get the sorting of grey relational grade of technical indexes such as air conditioning manufacturing cost, power consumption, difficulty of manufacturing, system reliability and so on. Comprehensive judgments on the merits of Chery A3 air conditioning system were made.