bluuebunny/crossref_metadata_2025 huggingface dataset:
The Research of Companding Transform for Peak-to-Average Power Ratio Reduction of OFDM Signals
Authors: Zhang Xiu Yan , Wang Wei Dong , Pei Lei Lei , Duan Yu Bo
Published: October 2011

One of the main drawbacks of orthogonal frequency division multiplexing (OFDM) is the high peak-to-average power ratio (PAPR) of the OFDM signal. How to reduce the PAPR is the key to applying the technology of OFDM efficiently. In this paper, companding transform method is presented. The performance of the systerm BER is analysised, then PAPR is reduced by using the method through simulation. Simulation results have shown that the proposed methods are very effective and flexible to improve PAPR performance in the OFDM based on the performance of the system BER is not changed very much compare to the original system.
The Research of Static Friction Coefficient Measure Technology and Calibration Method for Traffic Engineering
Authors: Ma Xue Feng , Guo Dong Hua , Lu Yu Hong
Published: October 2011

The measure technology of static friction coefficient of traffic engineering communication and cable ducts by using inclined plane method is introduced in this paper. The calibrated method for that equipment system of static friction coefficient is discussed, furthermore.
Intelligent Built-in Test Fault Diagnosis and Prediction for Mechatronics Equipment
Authors: Guo Ming Wei , Ni Shi Hong , Zhu Jia Hai
Published: October 2011

This paper proposes an intelligent Built-in Test (BIT) technology based on wavelet packet analysis and gray neural network. The aim is to improve the fault diagnosis and prediction capability of intelligent BIT. Firstly, the energy of each frequency-band was computed to form the eigenvectors by using the wavelet packet decomposition, then the energy eigenvectors were used as samples to the forecasting model, which were based on wavelet packet analysis and gray neural network. Finally, the proposed method was applied to the BIT system of the airborne mechatronics, and the results have shown that the proposed method could improve the performance of the intelligent BIT system.
Intelligent Temperature Control of Ceramic Kiln Based on Data Fusion Technology
Authors: Zhu Yong Hong , Wan Jun
Published: October 2011

At first, according to the feature of ceramic kiln, this paper studies a fundamental data fusion method which is applied to ceramic kiln temperature control system. This method is used to solve the parameter estimation problem in measurement noise environment. Then, it proposes a kind of intelligent control structure of ceramic kiln temperature control system based on multi-sensor data fusion technology. At last, this data fusion method is applied to intelligent temperature control system of ceramic kiln. The result shows that the method proposed is effective and feasible.
Median Morphological Filter Design Based on the PSO Algorithm
Authors: Zhu You Lian , Huang Cheng
Published: October 2011

Design of morphological filter greatly depends on morphological operations and structuring elements selection. A filter design method used median closing morphological operation is proposed to enhance the image denoising ability and the PSO algorithm is introduced for structural elements selecting. The method takes the peak value signal-to-noise ratio (PSNR) as the cost function and may adaptively build unit structuring elements with zero square matrix. Experimental results show the proposed method can effectively remove impulse noise from a noisy image, especially from a low signal-to-noise ratio (SNR) image; the noise reduction performance has obvious advantages than the other.
Regulation of PID Controller Parameters Based on Ant Colony Optimization Algorithm in Bending Control System
Authors: Yu Yu Zhen , Ren Xin Yi , Deng Chun Yan , Yu Jing Jing , Li Shu Zhen , Shi Jun Jie
Published: October 2011

The bending-roll control system has characteristics of time-varying, time-delay, nonlinearity and serious external disturbance, so it is hard to establish precise math model that be applied to control. In view of the problems above, ant colony algorithm is used to tuning parameters of PID controller and concrete step of PID parameters tuning based on ant colony algorithm is given. The simulation results indicate that the method not only improves control performance and dynamic quality, but also has strong self-adapting ability and robustness. It achieved a very good control effect when used in bending control system that proved the correctness and effectiveness of the control method.
Reserch on Cutting Depth Effect in Cutting Process
Authors: Dong Zhao Wei , Wan Xiao Hang , Li Shu Jun , Liu Sheng Yong
Published: October 2011

In the cutting procedure, the cutting depth influences cutting forces, chip breaking, chip shaping, and the distribution status of residual stress. The two-dimension heat-mechanic coupling orthogonal cutting model is established with the FEM analysis software by use of the Lagrange quality point coordinate system description method in this paper. This paper simulates a typical work-piece chip breaking process with different cutting depth, which gets the cutting forces curves and the total status of residual stress distribution and the status.
Unsteady Characteristics over Dynamic Delta Wings
Authors: Zhang Ming Lu , Yang Yi Ren , Lu Zhi Yong
Published: October 2011

A study of flow and frequency characteristics of the leading-edge vortices over a delta wing undergoing pitching up-stop motions is presented. The experiments with the dynamic delta wings were conducted in a water channel and a wind tunnel respectively. Among them, the test of the flow visualization was completed in the water channel with the delta wing with pitching up-stop motions. The result shows that in the case of pitching up-stop movement the vortex breakdown position is dependent on the range of incidence at which the wing is subject to pitching up-stop and the reduced frequency k (k=c/2U∞). Analysis of the pressure signal measured in the wind tunnel shows when the delta wing is subject to pitching-up the nondimensional spiral wave frequency at nominal incidence in post-breakdown is higher than that at corresponding static state and the bigger the k is, the higher the nondimensional spiral wave frequency is. The same conclusion is fitted with different sweep delta wing.
Influence of Pressure Amplitude on Formability in Pulsating Hydro-Bugling of AZ31B Magnesium Alloy Sheet
Authors: Yang Lian Fa , Yi Liang , Guo Chen
Published: October 2011

The formability of the magnesium alloy sheets is poor at room temperature even though the magnesium alloy sheets are attractive because of their excellent characteristics. Application of pulsating hydroforming is a new and effective method to improve the formability. The effects of the pressure amplitude on the maximum bulging height and minimum wall thickness of the formed parts of AZ31B magnesium alloy sheets are examined using finite element simulations. It is shown that the distribution of maximum bugling height and minimum wall thickness is similar for different pressure amplitude A, and a uniform expansion in bulging region is obtained, the cause of the uniform expansion obtained may be caused by the variation of stress components. The AZ31B sheet has an excellent performance in formability when the pressure amplitude and pulsating frequency are properly selected.
Research on Performance of Sasobit Warm Mix Asphalt and Influence of Aging Using DSR
Authors: Zhao Hai
Published: October 2011

In order to study the performance of Sasobit warm mix asphalt and the influence of aging, complex shear modulus G* and phase angle δ of Sasobit warm mix asphalt are tested by Dynamic Shear Rheometer （DSR） at different aging phase, to analyze the effects of Sasobit to the performance and the aging of 70# and SBS asphalt. The results show that with the increasing of the dosage of Sasobit, the value of G*/sinδ can be increased at different aging phase, the change in the phase angle has the same trend; the degree of Long-term aging of warm-matrix asphalt is larger than modified asphalt's. This may be related to the interaction of Sasobit and modifier.
A Detection Circuit to Faint Signal for Difference Absorption Gas Sensor
Authors: Wang Yan Ju , Chen Jia Xing , Kang Yue Yi , Yang Li Kun , Wang Yu Tian
Published: October 2011

ion: In gas difference absorption detecting system, the output electric signal is very faint and submerged in the background noise. In order to extract the faint signal covered by the background noise, we design the detective circuit aiming at how to restrain the noise and improve SNR of the system. In this paper, the detection circuit centering lock-in amplifier which reference signal frequency is automaticly followed is designed. The circuit adopts synchronization cumulating and locked loop technic, carries out frequency and phase aotomatic follow to the measuring signal by a locked loop circuit. The circuit not only avoids the tache taking reference signai from the modulator then adjusting the phase shif, but also improving signal-to-noise ratio more by synchronization cumulation.
A Natural Image Compression Approach Based on ICA and Visual Saliency Detection
Authors: Duan Li Juan , Ke Chun Xia , Wu Chun Peng , Yang Zhen , Miao Jun
Published: October 2011

In this paper, a natural image compression method is proposed based on independent component analysis (ICA) and visual saliency detection. The proposed compression method learns basis functions trained from data using ICA to transform the image at first; and then sets percentage of the zero coefficient number in the total transforming coefficients. After that, transforming coefficients are sparser which indicates further improving of compression ratio. Next, the compression method performance is compared with the discrete cosine transform (DCT). Evaluation through both the usual PSNR and Structural Similarity Index (SSIM) measurements showed that proposed compression method is more robust to DCT. And finally, we proposed a visual saliency detection method to detect automatically the important region of image which is not or low compressed while the other regions are highly compressed. Experiment shows that the method can guarantee the quality of important region effectively.
A Novel Skin Image Detection Method Based on GMM and GAs
Authors: Mao Ke Ming , Zhu Zhi Liang , Jiang Hui Yan , Deng Zhuo Fu
Published: October 2011

This paper proposes a new skin image detection method. First, skin pixel histogram in RGB color space is analyzed. Then Gaussian Mixture Model is used to constructed distribution of skin pixels. Second, a Gaussian parameter combination and selection procedure is implemented with Genetic Algorithms, and the optimal Gaussian Mixture Model can be obtained. Experimental results on public database show that our proposed method outperforms the traditional method with ROC test.
Application of Bidimensional Empirical Mode Decomposition to Medical Liquid Opacity Detection
Authors: Wan Jian , Diao Yuan Peng , Yan Dong Mei , Guo Qiang , Qu Zhen Shen
Published: October 2011

A Robert operator edge detection algorithm based on Bidimensional Empirical Mode Decomposition (BEMD) to detect medical liquid opacity is proposed. This method can effectively resolve the problem that traditional Robert operator edge detection can be easily effected by noise, and it also has certain effects on restraining external environment influence. The simulation results show that, compare with traditional medical liquid opacity detection methods, the proposed method could achieve higher detection accuracy, and has a certain theory and application value.
Calibration of Pressure Sensor in Automobiles Based on ZMD Chip
Authors: Wang Zhong Ming , Zhou Yong Zheng
Published: October 2011

In order to eliminate the negative effect of temperature to automobile pressure sensor whose environment temperature changes from-40°C to 130°C, a calibration circuit is designed based on ZMD chip. The temperature characters of this pressure sensor are: zero point linearly change with temperature at the rate-0.07mV/20°C; strain coefficient linearly change with temperature at the rate 3.27e-4/°C. After calibrated, the output of pressure sensor change only with pressure and the deviation value is from-0.48%FSO to +0.84%FSO，in the designing range ±2%FSO.
Comparison of Single-Layer and Multi-Layer Laser Scanners for Measuring Characteristic
Authors: Li Xin , Xiong Guang Ming , Hu Yu Wen , Li Wen Bin , Jiang Yan , Gong Jian Wei , Chen Hui Yan
Published: October 2011

This paper presents our initial studies on comparing properties of two laser scanners. The research mainly consists of two parts: tests on measurement characteristics of laser scanners and performances of them under different environments. Through the tests on measurement characteristics, we deeply understand the measurement drift over time and measuring stability of the two scanners. From comparing their performances under different environments, we found the suited application environment for the two scanners. The conclusion from the whole research provides a support for subsequent studies on intelligent vehicles.
Design and Fabrication of an Electromagnetic Stress Sensor
Authors: Sun Zhi Yuan , Leng Jia Xing , Liu Xiao Wei
Published: October 2011

Ferromagnetic steel material is widely used as the bearing carrier in structure, whose stress would influence the entire security. As stress has a notable influence on magnetic characteristic parameters of steel material, with analysis of basic principles, a tubular type magnetic stress sensor is proposed in this paper. We verified the rationality of the magnetic path design with finite element analysis (In FLUX), and proposed a method combined with experiment and simulation to calibrate the output voltage of the sensor. With the comparison of the simulation and experimental results, feasibility of this means is proved, providing a high efficient calibration method of this kind of stress detection sensor, showing a promising marketing value.
Difference Absorption Optical Fiber Methane Gas Sensor Based on FBG
Authors: Kang Yue Yi , Wang Yan Ju , Yang Li Kun , Wang Yu Tian
Published: October 2011

In this paper, based on analysis of the near infrared spectral absorption of methane molecule and considering factors such as compatibility with the transmission characteristics of silica optical fiber and the price, using Fiber Bragg Grating (FBG) filters to replace the the traditional interference filter, a novel kind of all-fiber remote sensor utilizing FBG filters and 1.33μm high power light-emitting diode (LED) was developed for real time measurement of methane gas concentration. FBG has a low insert loss and can be produced easily compared with dielectric interference filters. Theory and experiment proved that the system has simple construct and high sensibility.
Fusion of Infrared and Visible Image Based on Target Regions for Environment Perception
Authors: Niu Yi Feng , Xu Sheng Tao , Hu Wei Dong
Published: October 2011

Infrared and visible image fusion is an important precondition to realize target perception for unmanned aerial vehicles (UAV) based on which UAV can perform various missions. The details in visible images are abundant, while the target information is more outstanding in infrared images. However, the conventional fusion methods are mostly based on region segmentation, and then the fused image for target recognition can’t be actually acquired. In this paper, a novel fusion method of infrared and visible image based on target regions in discrete wavelet transform (DWT) domain is proposed, which can gain more target information and preserve the details. Experimental results show that our method can generate better fused image for target recognition.
Identification the Low-Frequency Oscillation Stakeout of Power System by Wide-Area Measurement System
Authors: Liu Yang , Huang Qian , Chen Dong
Published: October 2011

With the rapid development of interconnected power grid, the phenomenon of power system low-frequency oscillation appears unavoidably. Then, the appearance of wide-area measurement system provided a supporting technology for better scout low-frequency oscillation system and better recognize the oscillation mode . In this paper, the existing oscillation mode identifying methods are analyzed from the viewpoint of calculation speed, criterion, calculation accuracy, etc. Mainly compared the applicability of two methods, Prony and ESPRIT . Based on the above research, a new idea of monitoring power system low frequency oscillation based on WAMS is put forward in this paper.
An Effective CS-BP Algorithm for 2-D DOA Estimation
Authors: An Yu Yan , Bai Sen Sen
Published: October 2011

The bandwidth of the direction of arrival (DOA) estimation requires high sampling rate which extends the current analog to digital converter capacity. The paper presents an effective basis pursuit (BP) algorithm based on compressive sensing (CS) signals, which is called CS-BP algorithm, for two-dimensional (2-D) DOA estimation of Linear Frequency Modulation (LFM ). The simulation results verified that the method can effectively reduce the sampling data, and improve DOA estimation performance and efficiency.
Research on Note Location of Wireless Sensor Network in Logistics Transportation
Authors: Yao Su Fen , Yao Ge , Zhang Jie
Published: October 2011

In order to solve the location problem of WSN, this paper uses MCL algorithm to follow location, and improve the limited appliance of MCL algorithm. Nodes in the direction of the MCL algorithm can greatly reduce the estimated location of speculation and location of the computational filter stage, saving the energy consumption of the node. And more easily filter out positions inconsistent with the observations. For the establishment of logistics tracking and scheduling planning service system to provide technical support.
Research on Temperature Monitoring System for Electrical Equipment Based on Wireless Sensor Networks
Authors: Jia Dan Ping , Qiu Lin , Lin Song , Yang Ji Hua
Published: October 2011

A wireless temperature monitoring system based on fluorescence lifetime is researched in this paper, which mainly consists of the temperature acquisition unit and the master control monitoring unit. The wireless module with the core of low-power microcontroller (SX1212) and the sensor based on optical-fiber fluorescence are designed. And the unit of fluorescence temperature measurement is introduced in detail. Testing result indicates that the communication distance of the wireless module can be up to 300 meters, which meets the requirements very well. There are many advantages in this system, such as no wiring, better scalability, real-time monitoring.
The Safety Monitoring of Colliery Equipments Based on Data Mining Technology
Authors: Zhao Shu Fang , Chen Li Chao
Published: October 2011

Data mining is the process of abstracting unaware, potential and useful information and knowledge from plentiful, incomplete, noisy, fuzzy and stochastic data. The reliability of colliery equipments takes an essential role in the safety of production. Not only since their continuance of operation, had the accumulation of historical error data of colliery equipments resulted in a mass of surplus data, but also because their lacks of helpful information, which as a result makes colliery managers as well as equipment operators hard to make decisions. Seeing that, we introduced ways here that makes use of data mining technology by processing and analyzing historical monitoring data, recognizing and extracting meaningful patterns so as to provide scientific information for decision-making on the safety of colliery operations, which would help for the forecasting of potential threatens of colliery equipments’ operation, thus, make great contributions to prevent disasters from happening.
Video Signal Capture and Processing Card Based on H.264 Hardware Encoder
Authors: Ye Xi En , Chen Xing
Published: October 2011

This paper proposes a hardware and software design proposal of video collection and processing used in digital multimedia microteaching system. The system core is H.264 hardware encoder. 4-channel video data in the case of D1 (720*576) @25fps can be encoded in real-time and uploaded to the PC in distance control room. On the premise of stability, the system adopts friendly operating interface, the user operation is very convenience.
Voice Activity Detection with Decision Trees in Noisy Environments
Authors: Hu Da Li , Yi Liang Zhong , Pei Zheng , Luo Bing
Published: October 2011

An improved project based on double thresholds method in noisy environments is proposed for robust endpoints detection. Firstly, in this method, the distribution of zero crossing rate (ZCR) on the preprocessed signal is taken into account, and then the speech signal is divided into different parts to obtain appropriate thresholds with decision trees on the basis of the ZCR distribution. Finally, the double thresholds method, focusing on different importance of the energy and ZCR, is taken in the corresponding situation to determine the input segment is speech or non-speech. Simulation results indicate that the proposed method with decision trees obtains more accurate data than the traditional double thresholds method.
Voltage Dip Analyzing Method for Multiple Faults Condition in Complex Power Network
Authors: Wang Dong Xu , Le Jian , Lei Xiao , Yang Cai Xia , Zheng Xue , Liu Kai Pei
Published: October 2011

This paper proposed a voltage dip analyzing method for multiple faults condition in complex power network. This method regarded the fault points as virtual buses and introduced multiple fault position parameters into voltage dip analysis. It expanded the node impedance matrix by calculating the self-impedance of the virtual bus, the mutual impedance between virtual bus and non-fault bus, one virtual bus and another. According to the faults boundary conditions, each fault current phasor was calculated. The fault voltage function of any bus related with the multiple fault position parameters in the power network was derived. The voltage dip analysis result was obtained associated with the voltage dip threshold. The proposed method was validated in the standard IEEE-30 bus system.
Analysis on Application of HCCI Technology for Hybrid Electric Vehicles
Authors: Wu Jing , Zhang Hong Yuan
Published: October 2011

The article introduces HCCI technical characteristics, existing technical problems and characteristics of the hybrid electric vehicles, analyzes application feasibility and advantages of HCCI technology for hybrid electric vehicles and proposes that HCCI technology is an effective solution for the hybrid electric vehicles in increasing economy of internal-combustion engine oil and reducing emissions and further can realize batch production of products.
Effect of Yaw Angle Error in an Aircraft’s Aerial Triangulation
Authors: Wang Hong Xun , Liu Qin She , Wang Hong Wei , Wang Xing
Published: October 2011

Yaw angle Error was excluded in normal ground Triangulation. But in aerial triangulation, Yaw angle error of Direction-Finding (DF) platform is one of important factors which affect location precision. The theoretical GDOP of aerial triangulation is introduced out which included the yaw angle error of DF platform, the general GDOP distributions of aerial triangulation was brought out by simulation. The results showed that yaw angle error of DF platform degenerate location precision of aerial triangulation.
Fault Diagnosis of CNC Machine Using Hybrid Neural Network
Authors: Du Juan , Yan Xian Guo , Wei Na Sha
Published: October 2011

This paper proposed a technology of fault diagnosis for CNC machine based on hybrid neural network. Before the fault diagnosis was made, the fault patterns were firstly obtained from technical manuals and field experience to build a sample set, and then they were classified and coded according to the rule. In order to improve diagnosis speed, the fault diagnosis system was designed as a hybrid neural network system which consists of two-grade neural networks. When the fault pattern was input the system, the fault was first classified by the first-grade BP network, and according to the fault type, the corresponding second-grade ART network was activated to perform fault diagnosis. In this paper, the train algorithms of two kinds of neural networks were programmed by MATLAB. Comparing with the traditional diagnosis method, the presented technology possesses advantages of automatic fault diagnosis and ability for self-learning and self-organization.
Local Stiffness and Dexterity Analysis of a 3-SPS-S Orientation Fine-Tuning Manipulator for Segment Assembly Robots in Shield Tunneling Machines
Authors: Zhang Yan Wei , Wei Bin , Cui Guo Hua , Wang Nan
Published: October 2011

This study focus on the stiffness analysis of a three-DOF orientation fine-tuning manipulator for segment assembly robots in shield tunneling machines. In underground space development, shield tunneling machines are widely used in subway tunnels, channel tunnels and other kinds of tunnels. As one of the key sub-devices in a shield tunneling machine, a segment assembly robot is used to automatically form the segment lining. In order to evaluate the operational capacity, an analysis of the inverse kinematics is conducted. The local performance atlas, including stiffness and dexterity, are investigated. The results show that the proposed orientation fine-tuning manipulator has good performances and it can meet the needs.
Penetration Acceleration Signal Overload Rigid Separation Base on Local Mean Decomposition
Authors: Hao Hui Yan , Wang Ya Bin , Liu Ming Jie , Li Xiao Feng
Published: October 2011

Hard target penetration acceleration signals are non-stationary signals. In this paper use the local mean decomposition theory to analysis hard target penetration acceleration signals. Local mean decomposition can adaptively decompose any complex non-stationary signal into a number of physically meaningful instantaneous frequency components and these components could well reflect the intrinsic nature of the signals. Use local mean decomposition to separate the rigid projectile overload from hard target penetration acceleration signals. That provide reliable data to support accurately calculating the effective penetration depth, hard floors or holes through the number of target parameters on the penetration of weapons is significant. The author apply local mean decomposition algorithm in penetration acceleration signal separation and the results verify the effectiveness of the method.
PLC Control System Design for Automated Storage and Retrieval System
Authors: Zhang Jian Qi , Bao Fu Min , Li Mo Han
Published: October 2011

In order to satisfy the running requirements of Automated Storage and Retrieval System’s control system with big load, high speed and high accuracy, the design is proposed by adopting PLC and servo motor control. The Ethernet , MELSECNET/H ,CC-LINK and serial communication of Mitsubishi is adopted to satisfy complicated worksite environment, meanwhile the semi-closed loop control and full-closed control is adopted to satisfy the demand of high speed high accuracy smooth running servo control system. The practical application verifies that the system is of high reliability and stability, thus greatly meets the production requirements, and saves considerable labor force.
Real-Time Simulation Study for a Series Hybrid Electric Vehicle
Authors: Liu Xu Dong , Fan Qing Wu , Zheng Bang Gui , Duan Jian Min
Published: October 2011

To shorten design period and reduce development costs, computer modeling & simulation is important for HEV design and development. In this paper, real-time simulation for a Series Hybrid Electric Vehicle (SHEV) is made to test its fuzzy logic control strategy based on dSPACE-DS1103 development kits. The whole real-time simulation schematic is designed and the vehicle forward-facing simulation model is set up. Driver behavior is simulated by two potentiometers and introduced into the system to realize close-loop control. A real-time monitoring interface is also developed to observe the experiment results. Experiment results show that the real-time simulation platform works well and the SHEV fuzzy logic control strategy is effective.
Self-Optimized Nonlinear PID Controller for Networked Chaotic Systems to Synchronize onto Arbitrary Orbit
Authors: Liu Ge Qun , Xu Xiao Ming
Published: October 2011

Synchronization onto arbitrary orbit for diffusively coupled complex networks is of great application value and was investigated in this paper especially when nodes are chaotic systems. A decentralized nonlinear PID controller was proposed for this purpose. The controller was designed with assistance of associated feedback system of the network. A particle swarm style self-optimization algorithm was provided to find the optimal parameter of the controller online with IAE performance index. Finally a networked Chen system was given to be controlled to track sine wave, square wave and triangular wave simultaneously as the example to verify the method presented.
Characterization of Novel Perovskite-Type La0.6Sr0.2Ca0.2Co1-YFeYO3-δ  Cathode Materials Prepared by Solid State Reaction for IT-SOFCs
Authors: Li Chen , Zhao Jie , Kong Ling Long , Ma Yong Chang
Published: October 2011

Perovskite-type cathode materials La0.6Sr0.2Ca0.2Co1-yFeyO3-δ(0.2≤y≤0.5, marked as LSCCF62282, LSCCF62273, LSCCF62264 and LSCCF62255) for intermediate-temperature solid oxide fuel cells (IT-SOFCs) were prepared by solid state reaction. The establishment process and phase transformation were measured by TG-DTA, FT/IR and XRD techniques. Single hexagonal perovskite phase can be achieved after sintered at 1100 °C for 3 h. Mixed conductivity, thermal expansion behavior and chemical stability of sintered samples at 1100 °C for 3 h have been investigated. At intermediate temperature (600-800 °C), the mixed conductivity characterized by DC four-probe technique is higher than 100 S/cm. LSCCF62282 has the highest conductivity of 297.3 S/cm at 700 °C among the four samples. At lower temperatures, the conductivity follows small polaron hopping mechanism. Thermal expansion coefficients (TECs) of the samples from 50 °C to 850 °C exhibit a reducing tendency with increasing amount of doped Fe3+. Thermal expansion behavior can be improved by doping with Ca2+and Fe3+commonly. XRD pattern for LSCCF62282 and YSZ mixture sintered at 800 °C for 6h indicates that cathode material LSCCF62282 is chemically stable against YSZ electrolyte at operating temperature.
Critical Rotation Speed Calculation and Application Development of Multi-Stage Centrifugal Pumps for Mining
Authors: Li Wei , Shi Wei Dong , Jiang Xiao Ping , Xu Yan
Published: October 2011

Multi-stage centrifugal pumps for mining are widely used in mining and smelting industry. The operational environment in coal mine sewage is very harsh, so pump shaft and bearing failure happens frequently. In order to avoid disaster damage caused by failure of the pump shaft due to resonance, it is quite necessary and urgent to calculate critical rotation speed of the pump shaft. A calculation program of critical rotation speed for multi-stage centrifugal pumps for mining was developed using the secondary development tool of Object ARX, to give the computational method of the pump shaft load and static deflection and to achieve calculation of the critical speed, and which avoided the disadvantage of the traditional method. The practical application indicates that the program of critical rotation speed is convenient, intuitive and calculation accurate. It not only improves the work efficiency, but also reduces the labor intensity, so the program will have a good application prospect.
A Study of Bag-Breaking Device Based on Whitworth Mechanism
Authors: Ying Qin , Cheng Xiao Yong
Published: October 2011

It is a necessary step to break bags for bagged domestic waste before crushing it. This thesis carried out kinematic analysis for Whitworth mechanism, and put forward the requirements of shape of tool on account of the problem that materials (garbage) winded tools, In addition, it briefly discussed the design of avoidance device by Theory of Inventive Problem Solving (TRIZ). Preface Domestic waste refers to the solid waste generated in people’s daily lives. In recent years, with further urbanization, and the growth of population, domestic waste has been in sharp increase, so rational treatment of garbage has become a national sustainable development strategies related to the important issue. The main methods of waste disposal at this stage are landfilling, composting, incineration, of which landfilling is the most important. The level of domestic waste processing has a great gap between at home and abroad. As the processing technology has been started in Europe and other developed countries, thus, it is relatively mature, and the sense of residents’ environmental protection is stronger, the difficulty of waste disposal is reduced, so that the problems of waste disposal have been solved better. The research of waste disposal in China began in the 1980’s,and waste is bagged in the main form of garbage collection at present. On grouping garbage is so complicated and the equipments used to dispose garbage are insufficient, which can not meet the standards of waste reduction, innocuity and reclamation required by the government. At present, the garbage crushing equipment used in China is prone to twist, less efficient, poorly noisy, and adapt to different waste. Besides, it is easily over-fragment the unbreakable material such as glasses and used batteries, causing second pollution. Consequently, to develop new equipment for bagged domestic waste is of top priority.
Research on the Characteristics of PMSM Vector Control System Based on Speed Sliding Mode Controller
Authors: Fan Hui , Wang Yi Chao
Published: October 2011

In the actual permanent magnet synchronous motor servo system, the load changes are a major factor that affects system performance. In this paper, a PMSM vector control system model based on speed sliding mode controller is established in Matlab/Simulink environment. By adjusting the parameters of controller, simulation and analysis are done on the load changes that may appear. The results demonstrate that the system is stable, with good load characteristics and Robustness.
Comprehensive Analysis of Wheel Drive Motor Torque Characteristics
Authors: Sun Qing , Zuo Shu Guang , Ma Cong Gan , Zhang Fan Hui , Meng Shu
Published: October 2011

Wheel drive motor torque ripple will cause noise and vibration, and affect vehicle ride comfort. The research status of electric vehicle wheel drive systems was described briefly. Based on the analysis and comparison of several electric vehicle motor, The causes of torque ripple in permanent magnet DC motors were summarized. Preventive measures of the torque ripple were proposed accordingly. Finally to be proposed were the new questions of the torque output characteristic of BLDC while used as the wheel drive motor in complex driving conditions.
Mechanism of Improving Mechanical and Electrical Properties of Fe40NiCrSiAl Alloy Induced by Laser Shock Wave
Authors: Chen Rui Fang , Hua Yin Qun , Liu Hai Xia , Ye Yun Xia
Published: October 2011

This paper explores the properties of Fe40NiCrSiAl alloy treated by different methods. The hardness, elastic modulus and resistivity are tested. The results indicate that: after LSP to rolled Fe40NiCrSiAl alloy, the hardness increased 25.22%, the elastic modulus increased 7.17% and the resistivity decreased 39%. TEM photographs demonstrated that there appeared dislocations, martensite transformation and twin crystals inside the material after being treated by LSP. Twin crystals are the main reason attributing to the improvement of material electrical properties.
Dynamic Response Analysis of Cantilever Beam under Moving Mass by Time-Discontinuous Galerkin Finite Element Method
Authors: Hao Jian Wei , Ge Jian Li
Published: October 2011

A time-discontinuous Galerkin (TDG) finite element method for analyzing the dynamic response of cantilever beam subjected to moving force or moving mass is presented. The cantilever beam is discretized in space by finite element method, and the time-varying dynamic equations are derived. The TDG finite element method by which both the displacements and velocities are approximated as piecewise linear functions in time domain and discontinuous at the discrete time levels is adopted to solve the differential equations. This method inherits third order accuracy and the unconditionally stable behavior, moreover, it is endowed with large stability limits and controllable numerical dissipation. The numerical solutions are accord with analytic ones, which validates the feasibility and superiority of this method for solving the dynamic response of cantilever beam under moving force or moving mass.
Study on the Design Process Based on Green Design
Authors: Shu Yu’an , Xiong Xing Fu
Published: October 2011

Facing the new century design, we should take full consideration to green design in design, and should have the systematic concept when we design, to save resources, protect the ecology, prevent the pollution, and protect the environment as the guidance. Based on the green design concept, this article analyzes the process of design, discusses the connotation and meaning of green design, expound the process of the green design and combine the multiple conception and meaning of green design to confirm the various requirements and consideration of design process. This article also perfects the green design evaluation methods and provides certain guidance and reference for the green design evaluation.
Electromagnetic Analysis of Frequency Selective Surfaces Using the SSED Method
Authors: Xue Wei , Liu Chen , Zhu Nan , He Xiao Xiang
Published: October 2011

The Simplified sub-entire domain (SSED) basis function method has been introduced and modified to analyze some planar and curved Frequency selective surfaces (FSSs) with finite size. The number of unknowns and memory consumption of the methods are discussed in detail. The reflection coefficients and transmission coefficients are given, which agree well with the reference results.
The Pulverization and its Dynamic Model of Waste Thermosetting Phenol-Formaldehyde Resins
Authors: Song Shou Xu , Hu Jian , Wu Zhong Wei
Published: October 2011

Pulverizing the waste thermosetting phenol-formaldehyde resins by the self-developed machine which is used to recycle thermosetting plastics, studying the variable laws of fractions of different particle changing with the pulverization time, and establishing a pulverizing dynamic model by regression analysis. The results show that the particle distribution parameters b and m are not constants but the functions of pulverization time; the established equation of regression dynamic is high accurate which clearly describes the pulverization process.
Study of Cutting Composite Materials with Low Pressure Abrasive-Water Jet
Authors: Zou Zheng Long
Published: October 2011

This paper using low-pressure pre-mixed abrasive water jet to cutting composite material,testing and verifying feasibility of the low pressure abrasive water jet cutting , analyzes the abrasive waterjet working parameters on cutting of influence which performance level and interaction effect.
Research on the Properties of NiZnO Thin Films
Authors: Dong Xin , Wang Jin , Wang Hui , Shi Zhi Feng , Zhao Long
Published: October 2011

NiZnO thin films had been fabricated on c-plane sapphire substrates using photo-assisted metal organic chemical vapour deposition system. The crystal quality of the films had been improved greatly comparing to the results in earlier reports. The crystal structure analysis indicated the NiZnO kept the basic wurtzite structure until the content of Ni attained 0.18. The crystal and electrical properties of the films showed the content of Ni had an important effect on the properties of NiZnO films.
Effect of Supports on Stress Distributions in the Adhesive Joints
Authors: He Xiao Cong
Published: October 2011

The aim of this paper is to investigate the effect of supports on the actual stress distribution of the single-lap adhesive joints under tension using the three-dimensional finite element methods. Five layers of elements were used across the adhesive thickness in order to obtain an accurate indication of the variation of stresses. All the numerical results obtained from the finite element analysis show that the spatial distribution of all components of stress are similar for different interfaces though the stress values are obviously different. The results also show that most of the maximum stresses occur at the interface 1. It can be seen from the results that the stresses are concentrated near the left free ends of the adhesive layer while the centre region of the adhesive layer is mostly stress-free.
RDX-Based Energetic Material Cook-Off Characters in Different Clearances
Authors: Zhi Xiao Qi , Hu Shuang Qi
Published: October 2011

This paper presents the effects of clearance on reactive violence to RDX-based energetic material at the temperature rate of 2 ± 0.2°C / min. The experimental effort is to introduce the safe use of energetic materials in ammunitions and to reduce the vulnerability of energetic materials in practice. The results indicated that reactions were violent when charge clearance occurred. These phenomena are explained in relation to detonation theory. So clearance should be restricted for the safe use energetic materials in practice.
New Liquid Crystalline Material with an Azo Group in the Molecular Core
Authors: Chen Si , Li Si Pei , Wang Xu
Published: October 2011

A new kind of liquid crystalline material with an azo group in the molecular core was synthesized successfully. The chemical structures of the compounds were confirmed by mass spectrometry and 1H NMR. Their phase structures and transitions were investigated by differential scanning calorimetry. And the liquid crystalline behaviors were researched with polarized light microscopy experiments. The experimental results suggested that the compounds with a azo group in the molecular core can develop into a well-defined nematic phase.
On the Dynamical Behavior of Three Species System with Time Delays
Authors: Sun Dan Na , Wu Zi Ku
Published: October 2011

A three species system with time delays was considered. Firstly, we got the system’s three population equilibrium point and shifted it to zero point through transformation. Secondly, we analyzed the stability of the system at the equilibrium point. We support our analytical findings with numerical simulation.
A New Spacecraft Attitude Controller Considering Variable Saturation Limit of Flywheels Output Torque
Authors: Tian Lin , Xu Shi Jie
Published: October 2011

A new attitude controller is proposed in this paper considering variable flywheels output torque saturation limit. Control model is discussed while the time-varying and state-dependent torque saturation limit is derived. The new controller is similar to linear assignment of torque limit and covers attitude feedback information. With Lyapunov method, the asymptotic convergence of controlled system states is proved. The auxiliary parameter contained in the controller is guaranteed to be bounded to make sure that the control objective can be achieved. All of the simulation results validate the analysis and controller.
The Application of Functional Safety Standards on the Safety Management of a Chemical Process Tank
Authors: Zhang Yan Li , Gu Chun Lei , Ding Yong Jian
Published: October 2011

This paper describes a systematic way to apply the functional safety standards IEC 61508 and IEC 61511 on the safety management of a chemical process tank. After a short introduction of the basic principle of the functional safety philosophy the risk based determination of the safety integrity level (SIL) for a special liquid tank application is given. Then a safety instrumented system (SIS) suitable to the SIL-level 2 has been designed to fulfill the qualitative and quantitative requirements in the safety standards. The experience gained can be seen as a guidance for process and I&C engineers in industrial practice.
Experimental Research on Concrete Confined by Width and Spacing of Straps of GFRP Sheets
Authors: Liu Hua Xin , Wang Dong Ming
Published: October 2011

The technology of GFRP has received significant attentions in civil engineering due to their unique properties, such as high strength-to-weight radio, good resistance to corrosion and fatigue, convenient to construction and no additional dimension. Study the properties of GFRP confining concrete column through eight groups of columns subjected to axial loading, the effect of width of straps and spacing of straps of GFRP sheets confining concrete column is analyesed. The results are the axial compressive strength and ductility of concrete prism wrapped by GFRP sheets or GFRP straps have all increased to a certain degree, the process of destruction of concrete prism wrapped by GFRP become slower than common concrete prism.
Effect of Oil and HPAM in Polymer Flooding Wastewater on the Desalination Process by Electrodialysis
Authors: Deng Meng Jie , Shi Wen Xin , Yu Shui Li
Published: October 2011

A lab-made static electrodialysis (ED) unit was used to study the effect of oil and HPAM on the desalination process by electrodialysis. To do so, various kinds of wastewater samples were prepared to simulate the polymer flooding saltwater treated by ultrafiltration. The demineralization process and the fouling of the ion-exchange membranes could be studied by comparing the removal rates of salt by the desalination processes under different experimental conditions. Results showed that effect of oil on the desalination processes by electrodialysis was quite minor, while the polymer in simulated saltwater has much more effect on the desalination process, indicating serious fouling of ion-exchange membranes caused by HPAM.
Application of the Tabu Search Algorithm on Solving the Optimum Heating Institution of Reheating Furnace
Authors: Yang Ye Jian , Jiang Ze Yi , Zhang Xin Xin , Jin Peng
Published: October 2011

With the aim of minimizing the energy consumption cost and taking the billet heating quality as the constraint condition, a mathematical model was established based on the billet heating model to solve the optimum heat institution of the reheating furnace. The tabu search algorithm was employed to solve the model. The results of the industrial production data optimization showed that the proposed mathematical model and the solving method could fully meet the practical production demand of the reheating furnace. In addition to satisfying the heating quality requirements, the energy consumption is reduced and the oxidation loss is decreased. Compared with the original one, the heating institution obtained from the mentioned model and algorithm had a better performance on energy efficiency.
Effect of Gasoline Fumigation on Diesel Engine Performance and Emissions
Authors: Ou Li Jun , Wang Chun Mei , Qian Ye Jian , Huang Wei , Zhu Su Wei , Sun Jun
Published: October 2011

The present study investigates theoretically the effects of gasoline fumigation on single-cylinder diesel engine performance and emissions. The results indicate that a premixed charge can be obtained by early injection of gasoline because of the high volatility of gasoline. More homogenous mixture was obtained and the fuel burned faster and efficient. The smoke emission was reduced and engine output was increased. Coupling with EGR technique could reduce the NOx emissions simultaneously.
The Optimization of Bimaterial Microcantilever Design for Radiant Heat Flux Measurement
Authors: Liu Bing , Tao Chang Fa , Wang Xi Shi
Published: October 2011

This paper introduces a novel radiant heat flux measurement method based on bimaterial microcantilever. Focus on flame radiant heat flux measurement, the theoretical analysis and optimization of the bimaterial microcantilever, such as its shape, size and thickness ratio are carried out. So the dynamic response time and measurement range of flame radiant heat flux are discussed and determined.