bluuebunny/crossref_metadata_2025 huggingface dataset:
The Analysis of Implement of SiPM in LDRI System
Authors: Song Yi Shuo , Cai Wei , Du Xiao Ping
Published: May 2014

LDRI system stands for Laser Dynamic Range Imager. It has been used in STS-114 mission in 2005 as the main sensors to realize an on-orbit inspection of the thermal protection system which covers the Orbiter spacecraft. The basic of LDRI is phase discrimination and the key technology is the realization of optoelectronic mixing (OEM) using ICCD. Unfortunately, 2 main drawbacks arise from the usage of ICCD, including the high voltage (~2000V) of PMT drivers and the difficulties in high voltage modulations. SiPM is a rather novel detector which has the similar performances as PMT does but only requires a driving voltage of about 30V. Recently, the SiPM based OEM has been proved and this implies the implement of SiPM in LDRI system. In this paper, the basic of LDRI and SiPM are summerized and some theoretical analysis and simulations are made to verify the feasibility of implement of SiPM in LDRI system. The results show that SiPM is capable of realizing phase discrimination regardless of the high driving voltage and difficulties in modulations. The mean range error is found to be no more than 0.4mm within a range of 5m and an average incident power of 6nW.
Control Strategy of Low Voltage Ride-Through for Grid-Connected Photovoltaic Power System Based on Predictive Current
Authors: Zhang Ming Guang , Chen Xiao Jing
Published: May 2014

The control strategy based on predictive current is proposed to solve problems that destruct stable operation of grid-connected photovoltaic system during asymmetrical fall. A mathematical model of PV inverter is established to calculate current instruction; a method of tracking based on predictive current is proposed to reduce the fluctuations of 2 times frequency. In the meantime, PV inverter provides reactive power to support voltage recovery according to the depth of grid voltage sags and realize LVRT. The result also shows that the proposed control strategy can reduce wave of DC voltage and provide reactive power to support voltage recovery.
Research on Broadband Power Amplifier Adaptive Digital Pre-Distortion Based on FPGA Technology
Authors: Xiong Yu Shu , Ran Sheng Yi
Published: May 2014

In this paper, we use the adaptive function model to improve FPGA digital pre-distortion technique, design the adaptive pre-distortion function and algorithm, and adopt PC-CFR technique to process digital distortion problem in high order modulation, and obtain very good effect of digital signal processing. In order to verify the validity and reliability of PC-CFR technology, we use Agilent 89600 VSA software to exquisite power output signal before and after the broadband power amplifier pre-distortion. The results shows that before PC-CFR pre-distortion processing, phase difference of AM/PM reaches a maximum of 0.258, signal distortion is more serious; and after the PC-CFR pre-distortion processing, phase difference is only 0.021, the minimum is 0.005, which controls the distortion signal and improves the signal transmission quality. It provides technical reference to study the broadband power amplifier technology.
Novel Optimal Configuration of Multiple Hybrid Energy Etorage Combained with Wind Farm in Smart Grid
Authors: Li Jia Ming , Li Peng
Published: May 2014

The development and application of energy storage technology was described. Based on wind power fluctuation limit and system peaking demand in the smart grid, a novel optimized operation strategy between wind power and energy storage devices. The correctness of the strategy is verified by numerical example.
Study of the Influence of the Electrocoagulation Unit on Activated Sludge in Membrane Bioreactor
Authors: Zhang Hai Feng , Gao Zhong Yu , Zhan Lan He
Published: May 2014

The research team studied in the effect of electrocoagulation on sludge mixture from the angles of electric field and iron ion. The results show that: Electric field and iron ions can improve the activity of microorganism and Fractal dimension, Iron ions causes the MFI reduce rather than electric fields.
Simulation of VLF CSS System in Atmospheric Noise
Authors: Fu Gang , Wu Yan Jun , He Qian
Published: May 2014

Very Low Frequency (VLF) communication is designed to operate in the frequency between 3 kHz and 30 kHz. The atmospheric noise generated by lightning phenomena is the main source of interference in VLF communications, it is rather difficult to detect the communication signal that not only merged in strong channel noise, but probably interfered by high-tension impulse caused by thunder. This paper, Alpha stable distribution noise model is proposed to simulate atmospheric noise firstly, then, we study a new technique of Chirp Spread Spectrum (CSS) communication based on Fractional Fourier Transform (FRFT), This paper studies a new VLF communication technique of the Chirp Spread Spectrum (CSS) communication based on Fractional Fourier Transform (FRFT), and it demodulates message utilizing energy gathering property of chirp signal in FRFT domain.
Research of Control Method in Multi-Working Condition to Charging and Discharging under Multi DC/DC Modules
Authors: Jia Dong Ming , Guo Chun Lin , Tang Zhe Ci
Published: May 2014

This paper is based on the development process of charge-discharge experiment platform of electric cars under multi-working condition and more modules, it can carry out much charge-discharge experiment under several of control modes and parameters, and it contains lots of functions, like modular control, data collection, on-off control, human-computer interaction and environmental monitoring. There are 6 DC/DC modules in this platform, to realize these modules run independently under one backstage control system, meanwhile one module can change working condition ongoing, status inquiry and in-out operation automatic, this article proposes a new control method. It comes true by identifying critical parameters and taking into account many situations, finally we give the flow process of the method. The conclusion claim that this method could meet the request of the platform, and it has certain of reference price to such platform.
Applications of Two Level SVPWM in the Cascade Multilevel Carrier-Based PWM
Authors: Liu Zuo Ming , Xi Zi Qiang , Yu Chen Guang
Published: May 2014

First of all, this paper speculates that the essence of the space vector pulse width modulation (SVPWM) is the injection of some kind of zero sequence component through the theoretical analysis. Increasing the range of output voltage and reducing the switching loss are the optimization it can realize, the essential realization method is implemented by changing the placement of zero space vector. Then the method is applied to the cascade multilevel carrier modulation. The main work of this paper is to analyze the relation between SVPWM and the carrier PWM in the two level converter, then add the discrete modulation into the cascade multilevel carrier modulation to verify that the space vector modulation can be realized in cascade multilevel and can get similar results with the two level.
Development of the Mobile Power Supply System with Stabilizing Voltage and Frequency, UPS, Intelligent Charging
Authors: Zhou Bin , Chen Jing , Wang Yi Fei , Yuan You Xin , Yuan Liang , Kuang Ping
Published: May 2014

According to the principle of a novel integration method with stabilizing voltage and frequency, UPS, intelligent charging for mobile power supply proposed by authors, the mobile UPS system has been developed in this paper. The system is designed by the inverter NB70124 with integration functions and the additional peripheral configuration, such as the touch screen, the circuit breaker, and so on. The following works have been done in the study: the configuration of the mobile UPS system, communication between the touch screen and the inverter, GUI of the mobile UPS system. The system can be realized functions, such as the generating electricity, outputting stabilizing voltage and frequency, UPS, and intelligent charging. By the system, the high precision voltage amplitude and frequency is supply to outdoor load, and the UPS state is maintained.
Dynamic Mathematical Model of Variable Pitch Double-Fed Wind Power Generator
Authors: Wang Zhi Jie , Liu San Ming , Sun Xia , Su Xin Xia , Chen Li Juan , Pei Ze Yang
Published: May 2014

Based on the variable speed constant frequency doubly-fed wind turbine model, this paper increased the power factor control link for the wind farm to apply two kinds of constant voltage and constant power factor control mode of the simulation needs, and build a suitable for our country to contain a mathematical model of wind power system stability analysis.
The Design and Manufacture of the LED Acousto-Optic Game Box
Authors: Song Hui , Liang Yu Wen , Wang Zhi Tan
Published: May 2014

The article introduces a jaculatory acousto-optic game box that can display the numbers by LED. The box is a regular hexahedron, with different points on each side showed by LED. Its construction is similar with the dice played in mahjong. When the box stops, the LED on the upper side will be lighted, meanwhile, the buzzer will give out sounds in same number with the points.
Research on the Charge and Discharge Control of the High-Capacity Lithium Battery Using in Escape Capsule
Authors: Ouyang Ming San , She Qing Tao
Published: May 2014

The high-capacity lithium batteries are optimization in coal mine backup power supply. Their electricity properties directly affect their related equipment performance. So it is crucial importance for controlling lithium battery charge and discharge and understanding their characteristics. It puts forward design scheme of lithium-ion battery charging and discharging controller with STM32F103 chip. It includes DC/DC adopting full bridge phase shift high power switch, the sampling and processing circuit of voltage, current and temperature, charge and discharge control circuit, and software design flow of the real-time monitoring of lithium-ion batteries. The test shows that the charging and discharging control meet the design requirements.
Analysis of Two-Phase Operation Mechanism of Three-Phase Motor Based on Capacitor Phase Shift Method
Authors: Huang Yu Ping , Zhong Yue , Zheng Zai Ping , Xu Ying , Wu Hong Xing
Published: May 2014

In the absence of a three-phase power source, single-phase operation of three-phase induction motor used single-phase power source had a certain practical significance. In this paper, utilized symmetrical component method analysed the asymmetric circuit system of motor, will be voltage and current of the three-phase stator windings decomposed into positive, negative and zero sequence three groups symmetrical components. The theory is analyzed and the formula is deduced of capacitor phase shift method, solved the problem of starting torque, proposed to add starting capacitors and deduced the optimal value of starting capacitor. Finally, the single-phase operation of three-phase induction motor is simulated and verified by simulation software.
A New Power System Fault Diagnosis Model under UNIX Platform
Authors: Wang Lei , Chen Qing , Gao Zhan Jun , Chen Bin , Chen Min Wei , Sun Kong Ming , Wu De Jun , Wang Shi Tao , Pei Ying , Zhao Jun Wei
Published: May 2014

A new power system fault diagnosis model is proposed in this paper and it will be used in the UNIX platform. It includes the Petri net system's structure, software service and hardware integration method. Though technology of Petri net is quite successful, its application to power system fault diagnosis is deficient. According to the UNIX platform, a new power system fault diagnosis model is designed and it takes an example to explain how to use its high performance computing method (or parallel computing method) and UNIX environment to design a new intelligent algorithm with information fusion and multi-data resources in power system fault diagnosis.
Position Servo Control Technology Based on Sliding Mode Variable Structure for Permanent Magnet Linear Synchronous Motor
Authors: Zheng Ji Gui , Wu Hong Xing , Xu Ying , Zheng Ping
Published: May 2014

The traditional rocket and missile actuator usually uses the hydromantic servo system or pneumatic servo system, because of their better dynamic characteristic and structural adaptability. While with heavy weight, complex structure and expensive cost, it is difficult to realize. The permanent magnet active current servo motor has many advantages, such as high torque, small inertia, high efficiency, the high ratio of power to inertia, cramped construction, firmness, easy maintaining and high reliability. The electrical servo system using the permanent magnet active current servo motor as the power unit satisfies the need of the tactical missile gas vane and air vane servo system, because the range of its transmitted power is wide, its response is quick, and control power is low. This paper analyzed the pole shoe’s shape optimization characteristic against the interior permanent magnet synchronous motor for actuator, presents the design method and main process of permanent magnet synchronous motor for actuator using the field-circuit method. Optimal design can be acquired by the equivalent magnetic circuit method and the finite-element method conveniently and precisely. The analytical result of the prototype motor validated the feasibility of the optimization design.
Simulation of Indoor Temperature Control in VAV Air Conditioning System Based on Fuzzy PID and Smith Predictor Controller
Authors: Guo Tian Tian , Hu Qi Gao
Published: May 2014

A Fuzzy PID-Smith Control algorithm is proposed based on Fuzzy PID Control and Smith Predictor Control for the indoor temperature control of VAV air conditioning system which is a big inertia, pure time-delay, nonlinearity and greatly affected by circumstances complex temperature system. The algorithm flow and fuzzy reasoning rules were designed and it possesses the advantages of both Fuzzy PID and Smith Predictor. The simulation results show that the algorithm has fast response, small overshoot, high accuracy, strong robust and self-setting in line when the parameter changes and a great improvement in the aspects of overshoot and adjusting time has been achieved compared to the current control algorithm.
The Electronic Control Design of Automatic Door Based on Micro-Controller
Authors: Li De Wang , Zhang Wei
Published: May 2014

This paper mainly introduces the design scheme of the automatic door control based on the Micro-controller. The whole system adopts the modular design theory, uses high polymer piezoelectric materials as transducer and takes MC68HIIK4 as cybernetics core. Also, according to automatic door control requirement, it proposes corresponding improvement program on the basis of the common small-sized translational induction type automatic door. The system has the following advantages:simple operation,functional maturation, high sensitivity, low R&D cost.
The Design of Mixed Solution Control System Based on Siemens S7-412-3H PLC
Authors: Zheng Ming Feng , Yan Ya Lin , Miao Sheng , Hou Han Xia
Published: May 2014

In order to achieve the automation of industrial production, this paper designed a control system which used a Siemens S7-412-3H PLC as the core controller, the combination software of WINCC STEP7 and PCS7 was used for the mixed solution control system, and the control system showed the dynamic magic form of the control principle.
Keywords: Siemens S7-412-3PLC; PCS7; Mixed solution
Optimal Control for Wheeled Inverted Pendulum Based on Collaborative Simulation
Authors: Shi Xiang , Xu Zhe , Tian Ka , He Qing Yi
Published: May 2014

To control wheeled inverted pendulum is a good way to test all kinds of theories of control. The optimal control based on MATLAB is used to control wheeled inverted pendulum, and the control law is designed, and its feasibility is verified. However the mathematical model of the wheeled inverted pendulum is linearized and inverted pendulum is a high-order nonlinear system, both of them exist errors. Then the collaborative simulation of MATLAB and ADAMS is also used to control wheeled inverted pendulum, in which wheeled inverted pendulum is built up to virtual prototype model in ADAMS based on virtual prototype technology, and the control law designed from simulation of MATLAB is consulted. At last the results of simulation demonstrate the correctness of optimal control of wheeled inverted pendulum, and it also indicates the way is worth advocating in the study.
Adaptive Sliding Mode Control of Servo System
Authors: Wu Yue Fei , Ma Da Wei , Le Gui Gao
Published: May 2014

A novel adaptive sliding mode control is proposed to guarantee high precision and robustness of servo system of rocket launcher. An improved PID switching function is designed to smooth control input, meanwhile Chebyshev neural network is adopted to identify the system’s Jacobian information, and parameters of controller can be acquired by self-tuning law which can be derived by Lyapunov theory. Simulation results show the control input is chattering-free, and both load disturbance and parameter perturbation can be compensated.
Sumoylation of PDX-1 Regulates the Rat Insulin 2 Gene Transcription
Authors: Wang Nan , Jian Ruo Lei , Wang Feng Po , Mao Li Bin , Zhang Tong Cun
Published: May 2014

Insulin is essential for maintaining glucose homeostasis and is synthesized and secreted almost exclusively from pancreatic β-cells in the islets of Langerhans. The analysis of rat insulin2 promoter sequences indicates that it has pancreatic and duodenal homeobox factor-1 (PDX-1) binding site. In mature β-cells, PDX-1 transactivates the insulin and other genes involved in glucose sensing and metabolism. The function of PDX-1 can be regulated by post-translational modifications. Sumoylation plays an important role in regulating numerous physiological and pathological processes through altering the function of its target proteins. In this paper, to understand the function and transcription activities of insulin gene promoter, we constructed rat insulin 2 promoter (RIP II). Then we investigated whether sumoylation of PDX-1 activated this promoter transcription by luciferase reporter assay in HepG-2 cells. Results indicated that sumoylation enhanced PDX-1 activity for the insulin gene promoter transcription.
Study on PID Parameters Turning Method Based on Simulink
Authors: Wang Xin Rong , Tao Min , Jia Yun Xiang
Published: May 2014

The process of PID parameters turning is complicated and time-consuming to engineering technician. To solve this problem, simulating the Z-N method of engineering turning, based on the simulink, a simple and efficient method for PID parameters turning is presented in this paper. Compares with the general methods, it has many advantages, such as simplicity, visual manipulation, leaving out the work load of program and so on. The simulation results show the effectiveness of this method and be fit for application in the engineering.
The Research of Precision Detection System on Grade Rode Based on Image Processing Technology
Authors: Kang Hui Feng , Hou Qian Qian
Published: May 2014

In this article, a level ruler Precision Verification System program of the mobile-camera image processing technology that is based on the camera mobile image processing technology is proposed, as a result of the research for the existing barcode type level ruler verification system and a high-precision grating sensor system hardware structure is also built. Secondly, we calculate the uncertainty of the system, and at last do the system stability test that the results show that the system achieves the test requirements.
On the barcode type level existing ruler verification system research, proposed a camera mobile image processing technology based on the level ruler of precision calibration system, builds a detection sensor system with high precision grating, realizes automatic acquisition level ruler barcode image, method of application without barcode image with barcode image subtraction the preliminary processing of image acquisition, eliminate the influence of background light on the image acquisition, the uncertainty of the calibration system of the theoretical calculation and experimental verification, the results show that the system achieves the test requirements.
Design of Remote Monitoring System Based on GoAhead Web Server
Authors: Xiao Da Wei , Tang Lin , Ao Lei , Wang Yong Hui
Published: May 2014

This paper covers the current situation of remote monitoring system, combined with the basic features and running environment of GoAhead web server, Put forward the solution to integrate GoAhead web server, Internet, embedded development platform and Linux operation system, design a remote monitoring system. By which the user can monitor voltage and control the stepper motor’s running in real time. The application results show that GoAhead web server reacts rapidly manipulates data quickly. It’s feasible to put into place and to achieve satisfied effect for the management and control of the embedded product.
Procedure and Discussion of Failure Analysis in Iron-Steel Materials
Authors: Wang Zhi Gang , Shi Lu Dan , Jing Min , Xu Yong
Published: May 2014

The failure analysis of the H13 steel hot-forging mould is the main content in the open experiment. The scan electronic microscope and the optical microscope are used to analyze the failure workpiece in this experiment. The over-high quenching temperature, the too low drawing temperature, the insufficient drawing time and frequency, the over-high hardness value are the main reasons of fracture failure of the mould. The work environment of the failure materials, the heat treatment processing, the metallographic analysis, the fracture analysis and the using of test standard are the important aspects which the students should know. The students can learn how to analyze problem and how to solve them from the open experiments which is a good teaching try.
Design and Implementation of Vehicle Monitoring System Based on the Compatible Interface of Web Map
Authors: Zhao Yun Bo , Wang Jian , Chen Hong
Published: May 2014

This paper analyzes the present situation of intelligent transportation industry in China and proposes a solution based on web map compatible interface which is aimed at satisfying the various requirements of the vehicle monitoring system on map. Firstly the technical feasibility of the solution is analyzed and 36 interface methods are listed. Then design principles and key techniques of vehicle monitoring and tracking, historical trajectory playback, regional function and monitoring are provided. Finally the development environment of the system and the screenshot of running results are presented. This system has already passed the platform compliance testing of the Department of Transportation and has achieved good results in management benefit in several enterprises.
Research and Design of License Plate Recognition System
Authors: Ran Feng , Zhang Fa Yu , Xu Mei Hua
Published: May 2014

Introduce a complete system of license plate recognition: using morphological processing and priori knowledge of license plate to discern the location of license plate, accomplishing tilt correction through Radon transform, then fulfilling character segmentation of accurate positioning license plate by projection, finishing character recognition through BP neural network which was improved by the use of adaptive learning rate and momentum factor. With the programming and verification on Matlab experimental platform, experimental results show that we can have a preferable recognition speed and accuracy.
Rolling Bearing Fault Diagnosis Based on Second Generation Wavelet Denoising and Improved EEMD
Authors: Meng Ling Jie , Xiang Jia Wei
Published: May 2014

A new rolling bearing fault diagnosis approach is proposed. The original vibration signal is purified using the second generation wavelet denoising. The purified signal is further decomposed by an improved ensemble empirical mode decomposition (EEMD) method. A new selection criterion, including correlation analysis and the first two intrinsic mode functions (IMFs) with the maximum energy, is put forward to eliminate the pseudo low-frequency components. Experimental investigation show that the rolling bearing fault features can be effectively extracted.
The Research of Tunnel Roof Separation Monitoring Device Based on STC12C5A
Authors: Li Xue Zhe , Cao Yang , Qi Yan Wei , Gao Quan Ming , Wu Wen Feng
Published: May 2014

Tunnel roof separation monitoring is an important research content of tunnel supporting technology, it is of great significance to guarantee the safety of mine production. The traditional detection methods of roof separation have disadvantages of low precision, poor reliability, high cost, and the comprehensive analysis of measurement results is difficult. In the paper, a roof separation monitoring device based on STC12C5A is proposed. It has the core of STC12C5A single-chip microcomputer, and realizes the accurate measurement of displacement by using the fine drag-rope displacement sensor, and realizes the data communication and sharing by using bus interface. The device can achieve real-time, reliable monitoring of roof separation condition and also can make pre-caution to the possible production accident.
Building a Distributed Testing Execution System Based on TTCN-3
Authors: Liu Shuang Mei , Liu Yong Po , Wu Ji
Published: May 2014

In this paper, a distributed testing execution system is designed, which provides a mechanism of node communication, test script deployment, test scheduling, executor-driving and test result collection in distributed environment. A workload model is established, by which testers can describe the performance testing requirement. A performance testing framework is given, which simulates user behaviors in real environment based on virtual users so as to generate workload from the system under test (SUT). It can control the execution of virtual users by TTCN-3 standard interface. After executing the performance testing, test report is generated by extracting log. A method of generating performance test-case is studied by reusing functional test scripts. By executing performance testing on an online bookstore, this paper demonstrates the availability of the method of reusing TTCN-3 functional test scripts and the capability of distributed performance testing system that had been established.
Method for Testing and Analyzing the Printing Performance of Fluorescent Inks
Authors: Yang Pan Pan , Xu Yan Fang , Gao Na , Zhang Ya Yuan
Published: May 2014

In recent years, fluorescent ink, with a unique color performance and the advantages of green non-toxic, fast drying, thin ink, etc., is widely used in packaging printing, security printing, and other fields. What’s more, the luminescent properties and the interaction with paper of fluorescent ink are pained more and more attention. In this experiment, an ultraviolet light source is used to motivate the samples to emit, the fiber spectrophotometer is used to receive the reflected light of the samples in the vertical direction of the samples. The tone rendering curve and dot gain curve are obtained according to the radiation energy data of the sample, the printing indicators of fluorescent ink are obtained by analyzing the reproducing image tone scale and dot expansion characteristics of ink on the paper.
Impulsive Noise Detection and Elimination Method for GPS Measurement Data
Authors: Meng Qing Hai
Published: May 2014

For GPS measurement signal in aircraft experiment is often affected by transmission environment, and interfered with impulsive noise, hereby a SVD combined with wavelet neural network to detect and eliminate the impulsive noise method was proposed. The received GPS data is decomposed by SVD, and the decomposed component is acted as the input of wavelet neural network. Letts criterion is adopted to detect the impulsive noise according to the output residue error of the wavelet neural network. For the detection of the interference points of impulse noise, it can use wavelet network output to replace the measured value, so as to eliminate impulsive noise.
Combined QRD-M and Successive Interference Cancellation Detection Algorithm for MIMO Systems
Authors: Liu Li , Song Xin , Han Ying Hua , Liu Fu Lai , Wang Jin Kuan
Published: May 2014

In order to get better trade-off between detection performance and calculating complexity, an improved detection algorithm was presented here. QRD-M algorithm is performed for several layers firstly, and successive interference cancellation detection algorithm was used to detect the bottom several layers parallel, and the candidate sequence with smaller PAM was selected out as the answer. Simulation results show the validity of proposed algorithm.
Design and Implementation of Greenhouse Temperature and Humidity Remote Monitoring Based on Single Chip Microcomputer
Authors: Xiong Jian Yun
Published: May 2014

This article controls the temperature and humidity of greenhouse vegetables through the design of computer automatic control of vegetable greenhouse temperature and humidity remote monitoring system. On this basis, this paper states the corresponding design system’s hardware and software thought in detail, establishes the system core as AT89852 single-chip microcomputer, and with Delphi software to implement the corresponding system simulation. From the point of the effect of implementation, the system is of high automation degree, good human-machine interface, low cost, convenient and simple operation, so it has existence value and good application prospect.
An Effective Pattern Matching Algorithm for Intrusion Detection
Authors: Zhang Qing Qing , Zhang Qian , Feng Yue Jiang
Published: May 2014

This paper makes a summary of pattern matching algorithm in Intrusion Detection System: KMP algorithm, BM algorithm and BMH algorithm algorithm. The performances of various algorithms are analyzed, and then through the experiment data is verified. Last an improved algorithm based on the BM algorithm: BMD is proposed. BMD algorithm can reduce the space complexity and maintain the time complexity by reducing a pretreatment function and recording the number of times that a bad char found in the pattern.
Microwave Dielectric Properties of B2O3 Doped Ca [(Li1/3Nb2/3)0.95Zr0.05]O3−δ Ceramics
Authors: Xiong Gang
Published: May 2014

The effects of B2O3 on the sinterability and microwave dielectric properties of Ca [(Li1/3Nb2/3)0.95Zr0.05]O3−δ ceramics were investigated. B2O3 doping can effectively reduce sintering temperatue by 150~200oC. The temperature coefficient of resonator frequency τf increased with an increase of B2O3 content and sintering temperatue. When B2O3 of 2wt% were added, the optimum microwave dielectric properties: εr=28.7,Qf =13580GHz and τf= − 7.8×10−6/oC were obtained at the sintering temperature of 950oC.
Study on Thermogravimetric and Differential Thermal Characteristics of Aluminum Salt Flame Retardants
Authors: Zhang Xu , Li Dan , Xie Hua , Zhang Zhi Liang
Published: May 2014

Aluminum salt flame retardants have been synthesized by the chemical method under different reaction conditions. And then, the influence of the reaction temperature, ammonia concentration, aluminum ion concentration and addition on the thermal decomposition characteristics of aluminum salt flame retardants is analyzed and discussed on the basis of the experimental results obtained by using thermogravimetric and differential thermal analysis. Seeding experiments with the current work may have significant potential towards the exploration and development of inorganic salt flame retardants with good thermal decomposition performance.
An Engineering Approach for Observer Trajectory Optimization in Passive Target Tracking System
Authors: Zhao Chong , Quan Hong Wei , Peng Dong Liang
Published: May 2014

In passive target tracking system, the observer trajectories have an important effect on the accuracy of target localization and tracking. This paper addressed an engineering approach to optimize the trajectory altitude of observer platform for airborne ESM surveillance system. The method proposed is based on Monte-Carlo run, which avoid complicated theoretical deduction and make the observer path easy-to-practice. By the analysis, the general principle of observer trajectory altitude optimization can be obtained. Within the range of allowed flying altitudes for observer, the measurements of elevation should be maintain or close to 45 degrees as much as possible.
Center in Navigation System Design and Implementation of the Map Matching Algorithm
Authors: Zhang Chao , Ren Zhi Bin , Qi Hui , Meng Jun Hong , Wei Da
Published: May 2014

With regard to the map matching algorithm based on central navigation, the network data are downloaded according to the GPS data in real time. For this reason a network data transport protocol based on grid storage is designed. The paper discusses map matching algorithm on two cases according to having matching point or not. At last, a running experiment for map matching algorithm is given.
Trajectory Tracking Method Based on Feedback Control in the Virtual Domain
Authors: Zhao Ji Guang , Yan Liang , Li Yuan , Bai Guo Yu
Published: May 2014

A trajectory tracking method based on feedback control in the virtual domain is proposed for the algorithm of online real-time trajectory planning. The method using the way that polynomials approximate states and differential equations convert into algebraic equations. Time domain is converted into virtual domain by introducing the virtual path. Moreover, using the feedback correction tracks fixed trajectory exactly by real-time information. In the background of intercepting of ballistic missiles, simulation verification is carried out on the condition of initial minor disturbances. The simulation results demonstrate that the miss distance, pitch angle error and yaw angle error can meet the requirements.
The Study & Implementation of the Model of Heterogeneous Data Exchange Based on XML
Authors: Xia Yao Wen
Published: May 2014

Face the reality application in the "information island" problem, based on the analysis of the data exchange between heterogeneous database conflict, on the basis of this paper proposes a data exchange model in XML as middle format. Make full use of the XML is easy to extend, good interactivity and semantic is strong, can be formatted, easy processing, has nothing to do with the platform, and other features and advantages, and USES the c # language and XML and related technologies of the model carried on the detailed design and implementation of the main modules, and each function module in the model are relatively independent and extensible, strong commonality.
Discussion on Knapsack Problem Optimization Algorithm Based on Complex Network
Authors: Xiao Meng , Zhou Yun Yao
Published: May 2014

This passage is to put forward knapsack problem optimization algorithm based on complex network (KOABCN). Knapsack problem has extremely wide application in a great number of fields. For instance, knapsack problem can be applied in information coding, budget control, project choosing, material cutting, cargo loading and unloading as well as Internet information safety.
Since 1950’s, knapsack problem has been one of the most heated topics in algorithm and complexity research. Therefore, knapsack will still be largely focused in the next period of research.
DOA Estimation Algorithm for Non-Uniform Linear Array with Parallel Factor and Power Loading
Authors: Jiang Chi , Zhang Xiao Fei , Zhang Li Cen
Published: May 2014

The algorithm of DOA estimation for non-uniform linear array with Parallel Factor (PARAFAC) and power loading is carried out detailed studies and simulation in this paper, and we use Trilinear Alternating Least Squares (TALS) estimation algorithm to estimate the DOA of signal source. In addition, we make a simulation analysis and comparison of different parameters (Signal-to-noise ratio, the number of snapshots, the number of antenna elements, the number of targets, the similar angles) and different algorithm. Finally the thesis summarizes the work.
Motion Perception Based on Statistics of Phases
Authors: Wang Hong Xia , Chen Bo , Yang Hao Xing
Published: May 2014

A motion perception model based on the relative phase is proposed in this paper. Firstly we use bilinear representation based on DTCW to derive the phase information on each subband for image series. The relationship between phase shift and edge position is theoretically proved and the distribution of relative phase is carefully explored. Numerical experiments show that the distribution of relative phase may make up the limitations of phases in providing motion information. The new proposed model is quite robust to changing contrast, complex edges and severe noise.
An Algorithm of Network Sensitive Information Features Extracting
Authors: Cheng Xian Yi , Kang Wei , Guo Yu
Published: May 2014

In the vast ocean of data, how people can learn from the best, to eliminate the dross, the Internet age has become a major issue, also facing great challenge for data processing, and it is the key to develop the national network economy. For sensitive information filtering time lag, low accuracy, poor self-adaptability to the Internet, Chinese text media (webpage, micro-blogging, forum, etc.) for the study, using the technology of the opinion mining and natural language processing, study of sensitive information feature extraction algorithm to reveal the interrelationship of sensitive information and sensitive dictionary, providing technical support for sensitive dictionary and sensitive information recognition.
Farming Herdsman Fatstock Feeding Amount Forecasting and Control
Authors: Duan Wen Xi
Published: May 2014

The profit of raising fatstock is subordinated to the random variables of the normal distribution. The average feeding profit is established by using the statistical methods. Moreover, the function between the feeding profit and raising amount is determined by adopting the method of linear regression. The function relationship among the purchase price, demand and production capacity of raising fatstock is gained by using the binary regression method. Therefore, the price of the meat livestock in the future will be forecast. However, the amount of raising fatstock can be controlled according to the differences between the production capacity and the demand.
Application of Slipped-Window Integrator and Repetitive Predictor in APF
Authors: Wang Meng Qiong , Xu Chun Yu
Published: May 2014

In view of the shortages time lag existing in traditional digital low-pass filter in Active Power Filter (Active Power Filter, APF), this paper proposes to adopt slipped-window integrator to realize low-pass filter in harmonic current detection.The current tracking control uses Space Vector Pulse Width Modulation method. Meanwhile, the repetitive predictor is applied so as to improve the real-time performance of the compensation current tracking control. Built a three-phase shunt active power filter simulation model in Matlab/Simulink environment and take experiment under the low pressure condition. The results show that slipped-window integrator and deadbeat current mothod can acquire good dynamic response performance as well as high precision.
A few Kinds of Riccati Equation Integrable Conditions and Variable Separation Method
Authors: Yin Zhi Hong
Published: May 2014

Summarizes several types of the Riccati equation can be used in the form of elementary integral form and its general solution. The Riccati equation through the appropriate variable substitution can be variable separable equation, to calculate the general solution to use the method of elementary integrals. Some of these methods need certain skills. With a typical example this paper introduces the basic techniques of variable substitution.
Research on the N-Reduction of Fuzzy Covering Rough Sets
Authors: Li Qiao Yan , Chen Yan Yan , Li Shao Yang
Published: May 2014

The granular reduction plays an important role in covering rough sets, and the aim of this paper is to explore the granular reduction of covering rough sets and fuzzy covering rough set Firstly, the covering rough sets based on neighborhood element and the N-reduction are introduced, and their properties are discussed; secondly, The definitions and properties of upper and lower approximation of fuzzy covering rough based on the neighborhood are given; Lastly, the N- reduction of fuzzy covering rough based on the neighborhood element is proposed, and we can get that covering rough sets remain the same upper and lower approximations for N-reduction.
The Effects of Coupling Agents on the Electrical Properties of Polyimide/TiO2 Hybrid Films
Authors: Yan Kai , Liu Xiao Xu
Published: May 2014

Polyamides (PI)-matrix composite films with inorganic nanoTiO2have been fabricated by employing in situ polymerization. Before addition, TiO2particles were firstly modified with coupling agents (KH550). The electric breakdown strength and micromorphology of hybrid films were characterized and investigated. Results indicated that nanoTiO2particles were homogeneously dispersed in the PI matrix for the addition of coupling agents and the electric breakdown strength of PI/TiO2composite films with KH550 were better than unmodified PI composite film. The breakdown field strength and tensile modulus of PI composite film with the inorganic content of 5 wt% were 200.1 (KV/mm). So the using coupling agent can effectively improve the compatibility and the homogenous dispersion of nanoTiO2particles in PI matrix. Meanwhile, the procedure described here offers an effective and simple method to produce PI/TiO2with excellent electrical needed for future application in electrical engineering field.
Study on Fast Codeword Search Based on Improved Ant Colony Algorithm
Authors: Zou Da Yong , Wu Wei
Published: May 2014

Vector quantization technology is an efficient and competitive method for data compression, but it is not easy to be implemented because of the comparatively high computation complexity it requires during the coding and decoding process. This paper presents a method of Dual Population Ant Colony Algorithm Codeword Quick Search (DPACAS), exploiting the mechanism of ant trace the optimal path through the pheromones remained, and the behavior pattern of making objects together by picking up and putting down them. It uses Parallel Ant Colony algorithm to sufficiently accelerate the convergence of the ant colony. When the scale of the codebook becomes larger, by setting parameters reasonably and exchanging the pheromones between two species, it broadens the search space, reduces the search time and improves the algorithmic global convergence effectively.
Real-Time Speech Enhancement by Adaptive Spectral Subtraction Method
Authors: Wang Jing Fang
Published: May 2014

Non-stationary noise and strong background noise is difficult to extract the actual audio signal problem, an adaptive spectral reduction algorithm is proposed. A dynamic threshold algorithm is devised, iterative update mechanism and the specific implementation are contrived in the clean speech spectrum and noise spectrum estimating. Simulation experiments show that the algorithm can effectively de-noising filter, significantly improve the intelligibility of speech recognition system performance and read, and the method is robust in different noise environments and SNR. The algorithm complexity low, the computational cost is small, real-time, easy to implement, so that the effectiveness and real-time dual meet.
Bi-Level Locality Sensitive Hashing Index Based on Clustering
Authors: Wang Peng , Yin Dong , Sun Tao
Published: May 2014

Locality sensitive hashing is the most popular algorithm for approximate nearest neighbor search. As LSH partitions vector space uniformly and the distribution of vectors is usually non-uniform, it poorly fits real dataset and has limited search performance. In this paper, we propose a new Bi-level locality sensitive hashing algorithm, which has two-level structures to perform approximate nearest neighbor search in high dimensional spaces. In the first level, we train a number of cluster centers, then use the cluster centers to divide the dataset into many clusters and the vectors in each cluster has near uniform distribution. In the second level, we construct locality sensitive hashing tables for each cluster. Given a query, we determine a few clusters that it belongs to with high probability, and then perform approximate nearest neighbor search in the corresponding locality sensitive hash tables. Experimental results on the dataset of 1,000,000 vectors show that the search speed can be increased by 48 times compared to Euclidean locality sensitive hashing, while keeping high search precision.
Characteristic Exponent Extraction of Experimental Nonlinear Time Series
Authors: Liu Shu Yong , Wei Xiu Lei
Published: May 2014

The experiment of chaotic exponent extraction is carried out on the basis of nonlinear vibration system, and the responses under different conditions are processed with the improved algorithm. Firstly, the weighted wavelet denoise method is applied to filter the contaminated noise. Then, on the basis of fast search technology i.e. space grid hiberarchy inquiry method, the chaos characteristic exponent extraction algorithm is modified and applied to LE and fractal dimension calculation. Finally the piece-wise vibration system is designed, and the nonlinear dynamics under different harmonic frequencies excitation are analyzed. The comprehensive chaos judgment program is developed, in which the time domain diagram, phase space reconstruction attractor, Lyapunov exponent, fractal dimension curve of the measured data are obtained. The interesting phenomena such as AM modulation, limited cycle, and strange attractor are observed.
Simulation Analysis on Data Processing of Neural Network Based on Service Component Architecture
Authors: Sui Hua Jie , Shen Xun Bing , Luo Lan
Published: May 2014

College students are a group of the society. The college students' psychological evaluation data is the foundation of the research. Based on the SCA (Service Component Architecture) technology we complete the establishment and management of platform. Based on SCA architecture, each module can be abstracted as a service. It provides a unified interface for other modules and communication, which greatly enhance the portability and scalability of data. According to the related theory knowledge of neural network, we process data to complete the psychological evaluation data model. It provides the theory and research platform for different treatment methods of different psychological evaluation data.
Tensile and Impact Behavior and Fracture Characteristics of FGH96 Powder Metallurgy Superalloy
Authors: Liu Xin Ling , Zhao Kai
Published: May 2014

Powder metallurgy (P/M) superalloy has not only been the primary material of turbine disk but also the main material of packing disk, packing ring and baffle plate of the aero-engine. Among these components, some parts are very thin, for example, the thinnest of baffle plate is only 2mm. The thin plate component was subjected to complex load, and the failure mode was synthetical. Some parts of component are subjected to impact load or impact-fatigue load although the nominal load of this component is fatigue load, more than one baffle plates have cracked through fast expansion and burst multiple debris because of the different local load type for the same component. It is very useful to investigate the effect on tensile and impact properties by specimen shape and shot peening. In this article, the different tests were carried out, including different specimen shape, temperature and surfaces. The results indicated that fracture strength σb and elongation δ5 were not affected by shape of specimen of P/M superalloy. Rod or plate specimens may be used to characterize the static properties of material. Shot peening would decrease the elongation,δ5 (at room temperature and 650°C) and impact work, but it did not reduce the fracture strength σb. In order to utilize adequately the component subjected to complicated loads, the surface state of the component may be treated distinctively according to the specific local load.