bluuebunny/crossref_metadata_2025 huggingface dataset:
Study of Speed Adjustment in Friction Drive for Aerostatic Guide Way Components
Authors: Long Wei , Wu Zhang Yong
Published: December 2013

T Abstract here. This paper designs the transmission structures of an aerostatic guide way and makes a series of analysis respectively. With the use of friction drive theories, a transmission system which is composed by rods and oblique wheels is designed. After strength check and feasibility analysis of this transmission agent, ADAMS is adopted to do kinematics analysis successfully for this transmission agent. Finally related conclusions are made.
Study of the Influence of the Erosion and Wear on Artillery Internal Ballistic Performance
Authors: Yu Wen Wen , Sun Hai Tao , Fang Li Qing , Ma Zi Long
Published: December 2013

In order to investigate the influence of the erosion and wear on artillery ballistic performance, artillery ballistic model was founded, and graphic integration was used for providing the calculation of internal ballistic parameters. Base on this method, the influence of the erosion and wear on artillery internal ballistic performance was analyzed with the help of numerical simulation.
Stability Analysis on Double-Layer Single Span Rigid Frame with Sway Based on FEM
Authors: Cao Liang , Wang Hui Min , Qian Shan Guang , Huang Jian Feng
Published: December 2013

The FEM model of a double-layer single span symmetrical rigid frame was established in this paper, by changing the linear stiffness ratio between beam and column, the rigid frames stability with sway under the symmetrical load was analyzed, and the buckling load of rigid frame with linear stiffness ratio between beam and column was obtained, then the calculation length of corresponding column could be obtained too. The results were compared with the theoretical analysis results of displacement method, provided reference for the buckling analysis on double-layer single span symmetrical rigid frame with finite element theory.
Analysis on Slope Stability Based on Factor Sensitivity
Authors: Cao Liang , Qian Shan Guang , Wang Hui Min , Huang Jian Feng
Published: December 2013

A slope model was established in this paper, the accuracy of simplified Bishop Method based on rigid body limit equilibrium method was verified. The orthogonal experiment for structure was made aimed at the main mechanical parameters of rock material, and then simplified Bishop Method was used to analyze the slope stability. Using range analysis method and variance analysis method to analyze various factors affecting slope stability, then the key factors for slope stability were obtained. The focus of geotechnical engineering considerations was pointed out, and provided reference for more accurate slope stability analysis.
Mathematical Modeling and Simulating of Microscan for Area CCD
Authors: Li Ya Peng , He Bin , Sha Wei
Published: December 2013

A mathematical model for simulating microscan of area charge coupled device (CCD) is derived and presented. The model takes into account the effect of fill factor of CCD pixel to image quality and is employed to evaluate image quality improvement introduced by microscan. Imaging results of common imaging mode, diagonal microscan and four-point microscan of area CCD with 64% pixel fill factor have been simulated on Matlab based on the proposed model, using the scene information from an existing image. Then, gray mean gradient (GMG) and energy of Laplacian (EOL) are utilized to evaluate image quality performance. GMGs of imaging results obtained by diagonal microscan and four-point microscan are improved by 3.1346, 4.2200 respectively compared with that of imaging result obtained by common imaging mode, and EOLs are enhanced by 0.2242 and 0.3697 accordingly. Research demonstrates that microscan technique can enhance image quality, and four-point microscan provides more improvement on image quality than diagonal microscan. The model can be extended for simulation of microscan of CCD with other pixel fill factors.
The Design and Establishment of 3D Urban Underground Pipeline Plan Aid System
Authors: Tao Ying Chun , Zhao Lian , Zheng Guo Jiang , Yang Bo Gang
Published: December 2013

Urban underground pipelines are the lifelines of the city. With the acceleration of city modernization, the traditional way to design and manage pipeline plans which relies on 2D diagrams has been difficult to secure the normal operation of the city. In this paper, a standard automatic 3D pipeline modelling process is proposed; a way to manage massive 3D scenes by scene graph is raised; three patterns of 3D integrated visualization are suggested; innovative stereo displays of pipeline analysis results are thought out. Eventually, a 3D urban underground pipeline plan aid system has been developed. At present, the system has been used in Xicheng Bureau of the Beijing Municipal Planning Commission, providing valuable decision-making information for urban underground pipeline network planning and management.
The Method of Tree Dynamic Modeling under Rainfall Field
Authors: Li Tie Nan , Yu Shun , Yang Feng
Published: December 2013

Almost all the fields use tree modeling in society, so it analyses the tree modeling in the academic circles. But it is difficult to find an efficient tree modeling method because its own complexity and wind, rain acting on tree. The object suffers rain power that the force calculated by momentum theorem. And then compare the value of rupture limit to Young modulus. It is determined object to fracture or sway. Then it constructs tree dynamic modeling in the nature.
Applications of Multi-Point Mirror Supporting
Authors: Zhuo Ren Shan , Zhang Dong Ge
Published: December 2013

Primary mirror (PM) supporting system design is one of the key components to the design of a telescope. This paper presents applications of extended multi-point supporting structures that are employed in ground based theodolites, 3 points positioning-9 points supporting system and 18 points supporting system. A number of theoretical studies have been performed using Finite Element Analysis (FEA) on each supporting system, in which the extended multi-point supporting system to 0.6-m and 1-m diameter primary mirror is particularly focused. Analyzing Zerodur major mirrors with a diameter to thickness ratio less than 7.3, deformation due to supporting gives an RMS value less than 6-nm which is 24% of the design requirement of 60-nm. Series of experiments have also been conducted using 4-D interferometer. The deformation due to supporting of major mirror has been predominantly suppressed mainly by deformation during the fabrication process. This indicates that the above supporting systems perform an excellent task under given conditions.
Study on Dynamic Behavior of Ancient Timber Structures Roof
Authors: Dai Jun
Published: December 2013

The roof model of the palace timber buildings was established according to the construction technology of the Ying-tsao fa-shih. Based on its analysis of dynamic behavior with shaking table test and ANSYS finite element software, the dynamic behavior of structure and its maximal response under different conditions were gotten, and also the dynamic magnification factor of the beams layer and the whole structure were gotten, at last the results got by shaking table test was compared with the numerical simulation. Research shows that the nature frequency of the model is 1.486 Hz which is much bigger than that of the whole structure; the maximal displacement of beam layer gradually increases with the increase of ground motion intensity and the height of structure; the vibration isolation performance of semi-rigid tenon-mortise joints in rare earthquake (400gal) is better than that in moderate earthquake (220gal) and frequent earthquake (110gal); the dynamic magnification factor between layers was about 1, and roof 0.9 or so.
Numerical Simulation of Atmospheric Pressure Glow Discharges in Coaxial Tube
Authors: Zhao Chun Xiao , Lu Jun
Published: December 2013

The dynamics of atmospheric pressure glow discharges in coaxial tube have been numerically studied by a self-consist, one-dimensional fluid model. An asymmetric discharge current pulse, which operated in glow mode, was obtained in the cylindrical geometry. As the frequency or the voltage peak is increased, the discharge transits into a period-two state.
Study on Average Support Probability Oriented to Electromechanical Integration System
Authors: Wang Shen , Liu Tian Hua
Published: December 2013

The traditional model for average support probability often assumes that component life is exponentially distributed. But the different types of components in electromechanical integration system may follow different non-exponential distributions. In order to solve the problem, we formulate the random event of support failure as the event of system shutdown with service parts in short supply. We show system shutdown can be formulated as a Markov process and we develop a practical method for solving the problem of how converting non-exponential distribution to exponential. In the base of above, we develop an average support probability model for series system with arbitrary-life-distribution units. By simulating the operation of a non-exponential distribution system in Extendsim software, we compare the result with our model and prove the correctness of it.
Measurement of Amplifier Open-Loop Amplitude Frequency Characteristics Based on Virtual Instrument
Authors: Tian Tian , Jian Wu , Li Nie
Published: December 2013

In the electronic measurement field, how to measure the open-loop amplitude frequency characteristics of the amplifier automatically is a question to be overcame. And now , the system ,which under the integrated development environment that the virtual instrument software LabVIEW provides, to measure the open-loop amplitude frequency characteristics of the amplifier is developed by combining the modern electronic measurement technology and computer data processing technology. The virtual signal generator which is based on the data acquisition card, signal acquisition, correlation analysis, frequency response analysis, etc is included in the system. This design mainly includes the hardware circuit and the software program. The hardware circuit consists of the low noise preamplifier, measured operational amplifier, data acquisition card, power supply, computer, etc. Modular design is adopted in the software part, which includes the design of soft panel, signal generation, collection and analysis module. The advantages of the virtual instrument, such as the digital signal processing, waveform data automatic storage, graphical programming, are fully used in the modern electronic measurement. Simple structure, low cost, high level of test automation are its characteristics.
A Digital Compensation Device Based on Multiplying Digital-to-Analog Converter
Authors: Li Liang , Chi Zong Tao , Wang Yun Jing , Qu Zheng Wei
Published: December 2013

This paper presents a digital compensation device based on two multiplying digital-to-analog converters (M-DAC) whose reference voltages are the same standard AC signals. The output of two M-DACs, which is controlled by software coding, are used as the in-phase and the quadrature component through a reverse proportional amplifier and a derivation circuit respectively. Then the four-quadrant compensative signal can be got after the in-phase and quadrature components have been synthesized. The resolution of digital compensation device is determined by the M-DAC, and usually can be reached to 10ppm of the reference voltage. Measurement results show that the linearity of the presented digital compensation device is about 3.7×10-5.
Low Distortion Analog Front-End for Digital Electret Microphone
Authors: Bae Seung Yong , Lee Jong Do , Choe Eun Ju , Ahn Gil Cho
Published: December 2013

This paper presents a low distortion analog front-end (AFE) circuit to process electret microphone output signal. A source follower is employed for the input buffer to interface electret microphone directly to the IC with level shifting. A single-ended to differential converter with output common-mode control is presented to compensate the common-mode variation resulted from gate to source voltage variation in the source follower. A replica stage is adopted to control the output bias voltage of the single-ended to differential converter. The prototype AFE circuit fabricated in a 0.35μm CMOS technology achieves 68.2dB peak SNDR and 79.9dB SFDR over an audio signal bandwidth of 20kHz with 2.5V supply while consuming 1.05mW.
The Key Technologies Analysis of Automotive Head-Up Display
Authors: Liu Yuan , Li Yan Qiang
Published: December 2013

Under analysis of the head-up display system working principle, this paper details the key technologies of automotive head-up display, such as micro-projection technology, image processing technology and networking interconnection technology. At last, the development trends was introduced in detail.
The Study of Radio Frequency Electromagnetic Environmental Test for Cascade System
Authors: Wang Yi , Chen Yun Tao , Zhang Hua , Zhou Yong Liang
Published: December 2013

In this paper, a new method is brought to solve outside radio frequency electromagnetic environmental test of cascade system, which is becoming more and more import to meet electromagnetic compatibility requirements for systems. However, it is very difficult for comprehensive assessment as the volume size of cascade system is very big and irradiation spot of antenna is limited. Based on the theory of field line coupling and aperture-coupled, technology of injection and radiation, the difficulty of test is solved better.
A Bandgap Reference without Passive Components Based on Standard CMOS
Authors: Sun Ye Chao , Huang Zhuo Lei , Wang Wei Bing
Published: December 2013

A bandgap reference without passive components based on standard CMOS is proposed. Using an improved inverse-function technique without any curvature-compensated techniques, two reference voltages are got in different temperature ranges. One is 1.56V with a temperature coefficient of 9.2ppm/°C in the range [0, 14 °C at 3.3V supply voltage, and the other is 1.546V with 47ppm/°C in [-25, 15 °C at 3.3V. Its PSRR (power supply rejection ratio) is below-60dB at 10kHz, and it is quite suitable for integration in processing circuits of MEMS (micro-electro-mechanical systems) devices.
Ultra Broadband Power Amplifier Based on GaN HEMT
Authors: Cheng Zhi Qun , Jia Min Shi , Lian Xin Xiang , Luan Ya
Published: December 2013

An Ultra broadband power amplifier module based on GaN HEMT is studied. TGF2023-02 Chip of GaN HEMT from TriQuint Corporation is adopted and modeled first. The amplifier is designed with negative feedback technique. DC bias circuits and microstrip matching circuits are simulated and optimized carefully. Simulation results show that the amplifier module has a wide range frequency response from 3 to 8 GHz. It exhibits power gain of 7.6 dB, an output power of 37.5dBm under DC bias of Vds= 28 V, Vgs= -3.6 V at the frequency of 5.5 GHz.
Effects of Longitudinal RF Electric Field on the Characteristics of Dielectric Single-Surface Multipactor Discharge
Authors: Hao Jian Hong , Guo Yong Qing
Published: December 2013

A 2-D model of electron movement on the dielectric window surface is established, and the combined effects of additional RF field and dielectric surface electrostatic field are considered. According to the simulation of movement trajectories of electrons under different longitudinal RF field, it indicates that electrons are pulled back dielectric surface and transit time is shortened when longitudinal RF field and surface electrostatic field are in the same direction. While electrons are pushed away from the surface when the fields are in the reverse direction.We also analyzed the effect of longitudinal RF field on the multipactor discharge by calculating susceptibility diagrams.
Coherent Optical OFDM-PON Using Phase Diversity Receiver and Phase Estimation
Authors: Shao Yu Feng , Wang Jiang Jun , Wang Shi Kui , Wang Lian Dong , Luo Yin Xiang , Tan Ze Fu
Published: December 2013

In this paper, a novel CO-OFDM system using phase diversity receiver and phase estimating is proposed, theoretically analyzed, and demonstrated by simulation results. 10Gb/s C0-OFDM signals can travel in this system for at least 320km.
The Application of Project Management Maturity Model
Authors: Chang Xiao Ni , Wei Bin
Published: December 2013

With the application and development of modern Project Management technology, Project Management Maturity Model (PM3) made great progress and become a tool. This paper reviews the development history of project management maturity model, researches comparingly on several PM3, points out that scientific research can evaluate the project management ability by using PM3s theory and find out shortages, then seek method and approach to improve continually on project management. At last, The concrete application process and effect of PM3 are analyzed using examples. Keywords-Project Management Maturity Model; Manufacturing maturity; project management ability
Research on Nuclear Power Plant Operational Safety Performance Based on Confidence Level and Fussy Evaluation Model
Authors: Niu Dong Xiao , Song Zong Yun
Published: December 2013

Fussy evaluation model will be used in this article to evaluate the operational safety performance of nuclear power plant. Through the combination of the existing three indicator system, the article builds a safety performance indicator system and fatherly establishes evaluation matrix of the importance level and performance level,then gets the weigh and confidence of every indicator. Finally, the evaluation results of the operational safety performance of nuclear power plant can be obtained after analyzing the confidence and evaluation matrix.
Research and Development of Tracking Survey System Based on Employment of University Graduates
Authors: Zhang Ying , Jiang Fan
Published: December 2013

In this paper, the tracking survey system of empoyment of univeisty graduates is developed based on J2EE. Through tracking and surveying the university graduates employment by the system, we can provide a constructive opinion of major setting, curriculum provision, and the subject establishment. Which can increase the talent cultivation quality. This article collects practical employment condition of one university and confirms the system requirement. Moreover, it builds monitory system under the fuzzy comprehensive evaluation and applies the modern information technology to discuss this system realization.
Discussion of the Integrated Giddied Urban Management
Authors: Wang Ning Ning , Chen Rui
Published: December 2013

This paper concentrates on the gridding urban management (GUM). In the background of the rapid development of the process of urbanization and urban-scale, based on computer grid technology and space grid technology, Integrated Gridding Urban Management (IGUM) of the modern city is established, which included city management, economic management and social management into the areas of urban grid system. This model manages to further enrich the contents of the urban grid management. Furthermore, Knowledge-based gridding urban management (KGUM) mode is put up for the future of the smart-sensor city to realize real-time dynamic and intelligent city management.
Study on the Forecast Model of Water Quantity on the Basis of BP Artificial Neural Network
Authors: Ding Xiao Bin
Published: December 2013

Back Propagation network, Widely used in automatic control, image recognition, hydrological forecasting and water quality evaluation, etc., as one of the Artificial Neural Networks, has stronger property of mapping, classification, functional fitting. This article takes the water flow of Lanzhou section of Yellow river as example by use of BP model to predict the water flow. It is well proved that BP network model can reach the purposes of early warning and forecasting.
Design of Embedded Indoor Multiple Dangerous Gas Detection Alarm System
Authors: Fang Hong , Deng Lin Cai
Published: December 2013

This paper describes a embedded system,using ARM processor LPC2148 as the core of hardware,and using MQ series gas sensor as the detection component,and using ENC28J60 as the network communication interface,and using uc / OS-II real-time operating system as software platform for the real-time remote monitoring of density of harmful gases indoor.In this system,voltage signals from MQ sensor will be processed by the ARM micro-controller and be displayed in the LCD.Then they will be compared with the set voltage value.If they are greater than the set value,sound and light alarm will be touched off,and data will be transfered to the network through the ARM ENC28J6 network interface.Above all,the system is able to achieve accurate detection, alarm and remote monitoring indoor dangerous gases.
Multi-Touch Wireless Monitoring System Based on Android
Authors: Zhang Hai Bin , Tan Chao , Cheng Xi , Su Chao
Published: December 2013

Multi-touch wireless monitoring technology is one of the industrial control fields of human-computer interaction in the future development direction. The multi-touch system is based on android. We install it into the android system comes with a mobile terminal and WIFI will transfer all kinds of control signals to the industrial PC or embedded platform with WIFI module. And the embedded platform will complete the decoding and control PLC, so the multi-touch based on the android system of industrial control will be implemented. It can provide an effective solution for multi-touch applications in industrial fields.
A Method to Calculate the Net Power Delivered into a TEM Cell Using a Directional Coupler in a Probe Calibration Application
Authors: Liu Xiao , Xie Ming , Li Da Bo , Li Jin Yuan
Published: December 2013

In a probe calibration facility employing the TEM cell as the field generator, a method to calculate the net power delivered into the TEM cell is presented through monitoring the coupling power of the directional coupler. The new formula requires the effective reflection coefficient of the dual coupler and takes into consideration the directivity of the coupler, the mismatch between the coupler and the TEM cell, the mismatch between the power sensor and the coupling port of the coupler. The formula can provide sufficient accuracy in calibration purpose application using a TEM cell with a coupler combined with power sensors to monitor the net power.
Performance Enhancement of Gain-Modulated 3D Imaging System by Multi-Pulse Accumulation
Authors: Wang Fei
Published: December 2013

Range accuracy is one of the key parameters for 3D laser imaging systems. A gain-modulated 3D imaging system employing multi-pulse accumulation method is proposed to improve the range accuracy performance. Experiments results show that the range error decreases exponentially with the number of accumulated laser echoes.
Research on K Distribution in Anderson-Darling Goodness-of-Fit Test
Authors: Feng Rui , Liu Yun Xue , Fan Wen Qiang
Published: December 2013

Identification of radar clutter model is one important step to choose optimum CFAR processor in radar signal detection, and Anderson-Darling (AD) goodness-of-fit test considered the practical and effective way under small sample size. As K distribution is a complex model providing suitable description for the amplitude of microwave sea clutter, the research on K distribution in AD test is useful but very difficult. Moment-based methods are widely used to estimate parameters of K distribution and comparison show that methods with lower moments are more accurate. Further in AD test, the influence of shape parameter on critical value (CV) for K distribution is presented. Taking it into account, tables of AD test results using varied critical value advanced in our study and fixed critical value proposed in previous research are shown based on Monte Carlo simulations.
Impact of Missing Data on Parameter Estimation of EM Algorithm under Rayleigh Distribution
Authors: Li Zhen Dong , Li Meng Meng
Published: December 2013

Is EM algorithm parameter estimation under Rayleigh distribution sensitive to missing data and if it is, what extent is it? By designing computer simulation methods, contrast and analyze the results of maximum likelihood estimation and EM algorithm estimation under different missing rate. It shows that the results were almost identical when the missing rate is below 0.30, but the efficiency of EM algorithm gradually deteriorates as the missing rate increases. Meanwhile the results also show that the EM algorithm is sensitive to sample size and the selection of initial value.
The Method for Extraction of Marine Underwater Electromagnetic Anomalous Field
Authors: Yue Rui Yong , Liu Yue Lei , Tian Ji , Lu Jun Jun , Jiang Li Jun
Published: December 2013

Marine underwater electromagnetic field plays an important role in the prediction of the marine disasters, such as earthquake and tsunami. A detection method for the weak marine electromagnetic anomalous signatures generated by the earthquake and tsunami is presented. In order to implement the anomalous signal detection, the ocean current meter and tidal wave meter are integrated into the marine environmental underwater electromagnetic field measurement system, and the electromagnetic field data and environmental data such as sea current and wave height can be measured synchronously. The measured environmental data should be used to construct the prediction model of marine underwater electromagnetic field induced by the sea motion. Based on the prediction model, the theoretical values of electromagnetic field induced by the sea motion are estimated. This real signature induced by the sea motion can be extracted from the measured underwater electromagnetic data by use of the coherent filter method, and the remaining anomalous signature can be used to analyze the earthquake and tsunami phenomenon.
Image Stereo Correspondence Method for Stereo Vision
Authors: Chen Ai Hua , Gao Cheng Hui , He Bing Wei
Published: December 2013

Image stereo correspondence is the core technology of stereo vision. It has been widely studied and applied in the fields such as 3D reconstruction, vision measurement and target recognition. According to characteristics and application of stereo matching technology, the image stereo correspondence methods can be classified into three categories: local stereo correspondence, global stereo correspondence and semi-global stereo correspondence. Some image stereo correspondence solutions and problems are emphatically analyzed. Finally some future research issues on image stereo correspondence are highlighted.
A Color Image Enhancement Based on Improved Genetic Algorithm
Authors: Mo Shu , Yang Xiao Dong
Published: December 2013

Image enhancement plays a fundamental role in image processing. Because of the influence of internal and external factors such as the sensor precision,light,random noise.It has a certain difficulty for image recognition directly.To solve such problems, we proposed a novel and efficient enhancement method based on improved genetic algorithm. This paper combined median filter and improved genetic algorithm to enhance the visual effect of color image. Simulation results proved that the proposed method was stronger than traditional method in terms of details and contrast enhancement and natural visual effect.
A Sub-Pixel Edge Detection Method Combining the Interpolation with the Moment Theory
Authors: Zhou Ya Zhou , Sun Qiu Cheng , Chen Hao
Published: December 2013

A new sub-pixel edge detection method is proposed to improve the detection accuracy. Firstly, using the theory of interpolation to acquire the continuous gray level distribution in one-dimensional .Therefore, the location of edge is determined. Secondly, in view of the two-dimensional edge detection, the moment spatial is taken into account. At last, the two-dimensional edge detection simplified as one-dimensional. From the test ,its known that the accuracy of the this algorithm is higher, especially for images with noise. So, the proposed algorithm has good applicability in image processing.
Extraction Method of PCA for Alteration Mineral Mapping, Using Landsat TM Data in Northwestern Junggar Basin
Authors: Wang Shan Shan , Zhou Ke Fa , Wang Jin Lin
Published: December 2013

Wall rock alteration is an important indication of mineralization. On the basis of analyzing spectrum characteristic of Landsat Thematic Mapper (TM) image data, the rock ore spectrum characteristic and the theory of extracting information from remote sensing,this paper utilized Principal Component Analysis (PCA) to analyses and mapping efficiency of alteration information extracting. Study area is located in the North West periphery of Junggar Basin, China. PCA was carried out on six bands of Landsat TM data and the relevant principal components were chosen to obtain images that show alternation minerals. The results showed that PCA technique can be used as a very reliable method for enhancing the areas with alteration as a fast, effective and cheap tool for exploration of mineralization information in the northwestern Junggar basin.
Feature Extraction and Classification of Images Based on Corner Invariant Moments
Authors: Zhai Xue Ming , Zhang Dong Ya , Zhai Yu Jia , Li Ruo Chen , Wang De Wen
Published: December 2013

Image feature extraction and classification is increasingly important in all sectors of the images system management. Aiming at the problems that applying Hu invariant moments to extract image feature computes large and too dimensions, this paper presented Harris corner invariant moments algorithm. This algorithm only calculates corner coordinates, so can reduce the corner matching dimensions. Combined with the SVM (Support Vector Machine) classification method, we conducted a classification for a large number of images, and the result shows that using this algorithm to extract invariant moments and classifying can achieve better classification accuracy.
Thermal Test of Lunar Rock Drill Bit in Vacuum Environment
Authors: Hou Xu Yan , Cui Jin Sheng , Zhao De Ming , Hou You Song , Quan Qi Quan , Wu Xiang , Deng Zong Quan , Jiang Sheng Yuan , Tang De Wei
Published: December 2013

Drilling samples of lunar soil is an important and indispensable part of Chinas lunar exploration project. The drill bit temperature during the drilling process is one of the key concerns for scholars, especially for the hard lunar rock drilling in vacuum environment. In this article, a fiber grating temperature measurement system integrated with vacuum drilling system is established. Experiment on simulated lunar rock in atmospheric and vacuum environments is taken out and compared.
High Sediment Concentration Underwater Communication Using Current Field
Authors: Su Bao Ping
Published: December 2013

The Yellow River is the muddiest major river in the world. It has thick bottom sediment and its water has low light transmittance, which can make sound signal, laser, radio waves through it attenuated and communication distance in its waters limited. So it is unable to meet the communication requirements of the underwater survey. In order to solve the problem, based on the electrical conductivity of water, an idea of underwater communication using current field was proposed, a model of underwater current field communication channel was also made according to electromagnetic field theory. The relationship among the received signal, transmitting voltage, communication distance and other parameters were analyzed. Underwater current field communication devices were then developed. It was proved by test that the bi-way underwater communication of such devices was correct, reliable, and easy to perform, thus a practical and feasible communication means for the underwater survey in the Yellow River silt layer was provided.
Research about the LED Lighting Intelligent Control System and the Light-Sensitive Sensors Used in Feedback Module
Authors: Shen Zhong Hong , Yang Lin , Liu Qun Xing , Jiang Chun Xu
Published: December 2013

The basic composition and working principle of the intelligent control system of LED lighting was studied in this paper. And the two feedback control adjustment methods of this control system were researched deeply. Details including working principle and typical applications of light-sensitive sensor in feedback control part of this control system were studied. The content of this paper had great significance for the design of the intelligent control system of LED lighting.
Measuring System with Dual Magnetic Sensors for Outer-Rotor Type Torque Motor
Authors: Qiao Hai , Zhang Chi , Liao Yong Yong , Zhou Jie , Shu Xin Dong
Published: December 2013

As there is no round optical grating and magnetic grating with large diameter that is over 0.5m in the market, a measuring system adopting dual magnetic sensors based on FPGA is proposed in this paper to measure the position/displacement and velocity of the rotating outer-rotor motor. Through using strip-type magnetic grating to stick around the outer rotor over half circumstance, the proposed system is able to produce continuous position pulse signals by switching the signals of dual magnetic sensors. The system core chip distinguishes, subdivides and filters the signals from two sensors, judging the operational state of the sensor and generating the dual magnetic sensor switching signals. It can switches the sensor signals in real time during motor operation and measures the position/displacement and velocity of motor in a precise manner. Moreover, the position/displacement, operating time and positive/negative rotation can be displayed through man-machine interactive unit. The experimental results show that arc-second control accuracy of the outer-rotor torque motor can be achieved by using the proposed system to measure the speed and position/ displacement of the outer-rotor torque motor as the feedback signal through the motion control system of motor.
Performance of Manganese Oxide Reference Electrode for Concrete Monitoring with Inner Alkaline Electrolytes
Authors: Fan Ling , Wei Jun , Peng Shu Quan , Dong Rong Zhen
Published: December 2013

Manganese oxide electrode (MnO2) is a promising reference electrode imbedded in concrete for long-term health monitoring of concrete structure. The MnO2 electrodes made of the high purity graphite powders, the MnO2 powders and Ca (OH)2 powders mixed with the inner alkaline electrolytes such as saturated Ca (OH)2 solution or synthetic concrete pore solution are manually assembled. The rejection ratios, reproducibilities, stabilities and the effects of temperature and NaCl concentration in outer electrolyte (synthetic concrete pore solution) on potentials of the MnO2 electrodes are comparatively experimented. And then the comprehensive properties of the MnO2 electrodes are analyzed based on their potentials relative standard error (PRSE). Though the relative high rejection ratio of MnO2 electrode is induced by the manual method, the following results and conclusions can be drawn. Firstly the MnO2 electrodes express good performances with little potential fluctuations in outer synthetic concrete pore solution. Secondly the potentials under condition of certain temperature or certain NaCl concentration, the reproducibilities and stabilities of MnO2 electrodes are influenced by their inner alkaline electrolytes. Especially the potential of the MnO2 electrode with the inner saturated Ca (OH)2 solution in outer electrolyte with high NaCl concentration is more outstandingly stable than the one with the inner synthetic concrete pore solution. The third the MnO2 electrode with inner synthetic concrete pore solution has better comprehensive property than the one with inner saturated Ca (OH)2 solution when the temperature is less than 50 °C or the NaCl concentration is not greater than 0.1 mol/L in outer electrolyte.
The Electric Field Sensor Calibration System Based on Virtual Instrument
Authors: Liu Yue Lei
Published: December 2013

Virtual Instrument as the fifth-generation instrument has been a new technology with its unique advantages and got applying and developing more and more widely. From the view of composition and characteristics of the virtual instrument, the paper expounds the designing and developing process of electric field sensor calibration system based on the Ethernet and GPIB communication protocols. The table of the electric field sensor calibration system developed in the paper with a friendly interface improves the work efficiency of the electric field sensor calibration greatly, and the method and process of developing the electric field sensor calibration system could be a reference for the development of other relevant virtual instruments.
A Carrier Gas Flow Velocity and Flow Direction Sensor and its Interface Circuit
Authors: Liao Hong Hua
Published: December 2013

For the selenium content on-line detection of low voltage electrophoresis chip-atomic fluorescence, a design scheme of carrier gas flow velocity and flow direction sensor, which is fabricated using MEMS technology, is presented. A new structure was designed to achieve the current detection of heater, the detection of temperature and the discrimination of flow direction. Cu layer of the flexible PCB was used as resistive material because of its stable physical properties and linearity of temperature to resistance conversion. The sensor consists of one copper current detector, two copper flow direction detectors, one double-spiral copper micro-heater and one copper temperature detector. The operating principles and the fabrication of carrier gas flow velocity and flow direction sensor is emphatically expounded. Simultaneously, the detection and control system of carrier gas flow velocity and flow direction sensor and its interface circuit are analyzed and discussed.
Research on Energy Harvesting Device Based on Spatial Electric Field
Authors: Li Hong Wei , Yu Chun Hui , Zhang Li
Published: December 2013

It is rich in electric field energy in high voltage substations while it is hardly collected and utilized. A novel energy harvesting device based on spatial electric field is presented in this paper, which is composed of capacitive energy collector and conditioning circuit. A simulation model of the energy collector is established to study the relationship between output voltage and its structural parameters and is verified by no-load tests. There are some restraining factors such as output voltage unstable in the traditional conditioning circuit. A new conditioning circuit is designed to overcome the problems and this new circuit is more effectively. This paper designs a new device to harvest the electric field energy within substations and it can provide broad potential use in the future.
Design of the Active Audio Signal Sensor and its Application in the Correlation Algorithms for Water Leakage Survey
Authors: Zhang Peng Ju , Guo Gai Zhi , Yu Zong Zuo
Published: December 2013

Using piezoelectric sensors and low noise power amplifier, a probe for leak location was designed. With A/D-D/A converter TLV320AIC10s and one DSP chip TMS320C5402 which received the sampled data through McBSP0, the hardware connection of the two way real time sampling and correlation analyzing system for audio signals was accomplished. The software program of the system was completed by using assembly language in conjunction with C code. The experiment results indicate that the system is reliable and practical.
PACMLA: A Localization Algorithm Based on Permutation and Combination Midnormal for Wireless Sensor Networks
Authors: Jiang Wei Yong , Wan Pin , Wang Yong Hua , Liang Dong
Published: December 2013

Localization of sensors is one key technique in wireless sensor networks (WSN).Because the midnormal-based localization algorithm (MBLA) has shortcomings such as low accuracy, relatively large number of iterations, a localization algorithm based on permutation and combination midnormal (PACMLA) for WSN is proposed. Nodes are divided into anchor nodes and unknown nodes. In its own communication range, unknown node can communicate with anchor nodes. In PACMLA algorithm, the unknown node communicates with the anchor nodes in turn, and collects their coordinate information and RSSI value. Then by comparing the RSSI values received by unknown node, these RSSI values are formed an array in accordance with the order from small to large. Then starting from the first value of the RSSI array, each of these values and the value behind them will be combined into data sets. Finally, according to corresponding coordinate information of the RSSI value in the data sets, we will determine the position of the unknown node by Point In Which Side (PIWS) determination. In addition, our algorithm is a kind of Range-free algorithm, and it can cuts down the node energy cost. The experiment results illustrate that the PACMLA algorithm has lower error and higher accuracy.
Measurement System for Characterizing Liquid Moisture Transfer Difference between Two Surfaces of Textile Materials
Authors: Yao Bao Guo , Hong Shui Yuan
Published: December 2013

A new measurement apparatus was developed to characterize the dynamic liquid moisture transfer properties of textile materials such as textile fabrics, based on the mechanical equipment, microelectronics, sensors and control system. Derived from the test data, five indices were defined to characterize the dynamic liquid moisture transfer difference between two surfaces of textile fabrics. The test principle and the evaluation method for the dynamic moisture transfer difference between two surfaces of textile fabrics were introduced. Six types of fabrics made from different textile materials were measured. The one-way ANOVA analysis was carried out to identify the significance of the differences of the indices among the test fabrics. The results show that each evaluation index is significantly different (P<0.05) among different test fabrics, and fabric 3 has a better liquid moisture transfer from inner surface to outer surface with the highest value of moisture transfer difference.
Design of Control System for Multimedia Classroom Based on Mitsubishi PLC
Authors: Li Wen Guo , Duan Shao Jun
Published: December 2013

A control system for multimedia classroom is designed based on Mitsubishi PLC. The specific hardware design and software design are also given. The control system functions are as follows: The manual control of classroom doors, or automatic control by the detection signals of microwave radar sensors; The manual control of lights, or automatic control by the detection signals of the Human pyroelectric sensors and light switch type sensors; The manual control of the air-conditions, or automatic control by the detection signals of the temperature sensors; The control of the projector and screen; Intelligent fault detection and alarm. In addition, the touch screen is used as man-machine interface, which have the advantages of convenient operation and maintenance, also the generous beauty. Through simulation experiment, the control system can achieve all of the above control functions stably and reliably.
Self-Healing Control for a Class of Uncertain Power Distribution Network Based on Fuzzy Sets Theory
Authors: Yu Tong Wei , Wu Chu , Sun Xin
Published: December 2013

The self-healing control problems attract many concerns of researchers who major in power distribution network. This paper proposes a novel self-control method for a class of power distributed network with uncertainties. The fuzzy set idea is introduced to solve the uncertainties considered here. The efficiency of the proposed method is demonstrated by simulation results.
Active Damping Control for an Electric Vehicle Using Robust Controller
Authors: Zhang Hu , Wang Cun Lei , Zhang Yong , Yin Cheng Liang
Published: December 2013

For an electric vehicle, during pedal tip in/out, driveline torsional resonance frequency can be excited by a quick motor torque response. As a result, noticeable oscillations can occur in the vehicle acceleration without adequate controls, which can cause discomfort for passengers. This paper proposes robust controllers to damp driveline oscillations during pedal tip in/out for an electric vehicle. Based on control-oriented system models that take account of various parameter uncertainties and unmodeled dynamics, robust controllers were designed by using the mu synthesis method. The results of the simulation demonstrate the effectiveness of the proposed control algorithms.
Computer Hard Disk Planeness Vision Measurement System Calibration Based on Light Plane Constraint
Authors: Tang Rui Yin , Zeng Zhou Mo , Li Peng Fei
Published: December 2013

This paper proposed a calibration method of sheet-of-light vision measurement sensor based on light plane constraint. Through capturing 12 images of different direction from homemade circular calibration target, the center of the circle and the light stripe is extracted based on Halcon platform of Germany. The experimental results obtained the intrinsic parameters, extrinsic parameters and radial distortion coefficient of the nonlinear model. At the same time the light plane constraint equation is got based on PCA plane fitting method. The results show that the calibration method is simple and reliable, and the method does not need any auxiliary adjustment. The work laid the better foundation for hard disk planeness vision measurement.
Flocking Control Algorithm with Communication Time-Delay
Authors: Peng Huan Xin , Yin Jian Guo , Liu Bin
Published: December 2013

In the paper, we analyze the distributed flocking control algorithms under virtual leader-follower model with communication time-delay. Under virtual leader-follower model, flocking algorithm can avoid diverging, but the performance of flocking control algorithm with communication time-delay often degrades. In the paper, we analyze the impact brought by communication time-delay on the flocking algorithm when part agents can receive the information of the virtual leader, and simulations are done. Results show that the performance of distributed flocking algorithm depends on the number of agents that can receive the information of the virtual leader and the communication time-delay. Bigger is the number of agents that can receive the information of the virtual leader, better is the performance of flocking algorithms with communication time-delay.
A Servo Control Scheme of the Integrated NC Machine of Pipe Fitting
Authors: Wang Cong , Chen Jing , Yuan You Xin , Deng Yi , Long Xiao Bin
Published: December 2013

The current pipe fitting forming process is characterized by more than one equipment and gradually formation processes. Therefore, a servo control scheme of the integrated NC machine of pipe fitting is designed. The following works have been done: design the integrated NC machining processes and structure, and design a novel servo control scheme for the machining equipment. The automatic integration processing of pipe fittings is operated by the SCC control system. It could fulfill the integration NC machining and any combination of processing just by putting the pipe into the entrance of the machine artificially. The integrated equipment can realize the integrated numerical control, combine the whole processes willfully, and enhance the process quality. This scheme can be used for the pipe fitting forming in the air conditioning, the water heater, the refrigerator, or the automotive industry.
Impedance Control System for a Biped Skating Robot
Authors: Li Jin Liang , Bao Ji Hua , Yu Yan
Published: December 2013

This paper studied impedance control problem for a biped skating robot. Impedance control for ground reaction force which is realized through varying load impedance between supporting leg and ground to maintain flexible contact is vital to motion control problem. Biped skating motion is divided into three phase, i.e. leg swing phase, weight reception phase and supporting phase. During weigh reception and supporting phase, one the of the robot legs has pushed onto ground to generated reaction force which must be controlled for dynamic stability. During swing phase a PID controller is used. Impedance control is realized by varying the load impedance between supporting leg and ground to maintain flexible contact. By proposed impedance control method, a dynamic stable skating movement controller was successfully developed for the biped robot with skating speed of 0.13 m/s.