bluuebunny/crossref_metadata_2025 huggingface dataset:
The Drying Characteristic of Biomass with High Moisture Content
Authors: Wang Xiao Qiang , Feng Shi Ye , Su Shu Hua , Zhang Zhi Bo , Lu Qiang , Dong Chang Qing
Published: October 2011

This paper presents the drying characteristics of rice husk and cornstalk with high moisture content at fixed temperatures. Experiments were performed in an oven drier, to reveal to the effects of initial moisture content, bed thickness and drying temperature on the biomass drying characteristics. The results indicated that the drying time was decreased as the rising of the drying temperature, and increased along with the initial moisture content and bed thickness. Moreover, the risk husk was easy to be dried than the cornstalk.
Improved Method of Target Detection on Optoelectronic Hybrid Joint Transform Correlator in Cluttered Scences
Authors: Qian Yi Xian , Yang Li Bao , Cheng Xiao Wei , Hong Xue Ting
Published: October 2011

A classical joint transform correlator (JTC) usually yields large correlation sidelobes as well as a large correlation peak width, strong zero-order peak, and low diffraction efficiency, which make the detection ability of JTC lower. To overcome these difficulties, firstly, a joint power spectrum (JPS) subtraction technique in Fourier plane was proposed, where reference image power spectrum and object image power spectrum are subtracted from the JPS before inverse Fourier-transform operation, it is obvious that the modified JPS removes the zero-order term. Secondly, a fringe-adjusted filter (FAF) was presented to suppress sidelobes and noises. The modified JPS is multiplied by a FAF before the inverse Fourier-transform operation to obtain the cross-correlation peak. Computer simulations demonstrated the improved method can obviously remove zero-order diffraction and effectively suppress the sidelobes and noises compared with classic JTC, and then improve the detection ability for JTC. Experimental results presented the sharp correlation peak and also confirmed the method effectiveness.
Key Factors in Fiber Point Diffraction Interference Technology for Measuring Surface
Authors: Li Jie , Chen Ling Feng
Published: October 2011

The point diffraction interferometer (PDI), which generates the nearly ideal spherical wavefront with the pinhole method, is realized the absolute interferometric measurement without the use of reference surface. But it is hard to detect the diameter of the pinhole and hard for use of phase shifting interferometers in PDI. However the advanced fiber point diffraction interferometer (FPDI) not only replaces the pinhole with the fiber, but also makes it possible to implement phase shifting and maintain advantage of traditional PDI. In this paper, the different methods of measuring surface are proposed according to different experimental conditions and different targets (such as concave spherical surface, convex spherical surface, flat surface) with the fiber point diffraction interferometer built in the laboratory. Base on these experiments, there are several key factors in the measurement process such as measurement configuration, laser source, polarization beamsplitter, optical fiber. And these factors, affecting the experiment accuracy, were analyzed seriously.
Research on High-Precision Intelligent PWM Optically Controlled LED Road Illumination Drive Power Supply
Authors: Wang Yi Wang , Wu Shuo
Published: October 2011

Considering the traditional LED road illumination drive power supply existence some shortcomings,such as the illuminance can not be adjustable, output current constant poor accuracy and so on. Therefore this paper design a high-precision intelligent PWM optically controlled LED road illumination drive power supply,which use the fuzzy control algorithm can automatically adjust power output drive current according to ambient light, and achieve LED optically controlled, then improve power efficiency and save energy.The experimental results show that the design has very good characteristics of LED road illumination intelligent optical ly controled, high-precision output constant current, strong adaptability, stable and reliable performance.
An Experimental Investigation on Controllable Slow Light Based on a New-Type Multi-Stage Delay SBS Structure
Authors: Cheng Hong Qiao , Yang Li , Chen Long Yin , Cao Ye , Tong Zheng Rong , Yang Xiu Feng
Published: October 2011

A new-type controllable slow light system based on a multi-stage delay Stimulated Brilliouin Scattering (SBS) structure is proposed. In this experiment, a shorter fiber (600 meters) is used to raise the Brillouin thresholds, and the pump power is also increased, therefore the unsaturated gain and the single-stage delay effect are enhanced. Moreover, the two fiber segments of slow light delay are cascaded by two circulators in the configuration, which can increase the delay time and the utilization rate of stokes signal during the experiment, the signal light which the power is-15dBm has acquired 51.299dB gain and the delay time is 55.333ns. Compared with the single-stage delay, the delay time has been increased.
Study on Light Intensity Enhancement of ZnO/ITO/P-GaN Light-Emitting Diodes
Authors: Chang Hsing Cheng , Chen Ya Hui , Hung San Shan , Lai Chi Chih , Hung Chein Chuan , Chang I Nan
Published: October 2011

Light intensity enhancement of GaN-based blue light-emitting diodes (LEDs) is performed using different surface roughening technologies. Three roughening technologies are applied that contain surface roughening of p-GaN, textured indium tin oxide (ITO) on roughened p-GaN, and growing ZnO nanorods on textured ITO/p-GaN. A roughened p-GaN surface was grown on the c-plane sapphire substrate at temperature 800 °C. The morphologies of the textured LEDs with roughness in the range from 9.67 nm to 51.13 nm were observed. The light output efficiency of LED with roughened ITO layer is increased up to 73.8 %. Different dimensions of LEDs can be driven by constant injection current 20 mA without increasing threshold voltage, and larger size of ZnO/ITO/p-GaN LED shows higher luminance intensity. The LEDs with ZnO nanorods on roughened ITO/GaN have shown great performance to enhance the power conversion efficiency.
Application of Direct Actuated Digital Servo Valve in Electrohydraulic Static Loading System
Authors: Zhu Fa Ming , Li Sheng
Published: October 2011

Structure static testing is an important means to study the static characteristic of complex engineering structure. Electrohydraulic stactic loading system is the singnificant equipment of the testing. With its function of transfering low-power electrical singal to large-power hydraulic output quickly and precisely, the servo valve plays a key role in an electrohydraulic servo control system and dominates to a large extent the performance of the whole control system. Conventional electrohydraulic servo or proportional control is subject to the nonlinearites of their electro-mechanical interface, such as hysteresis, saturation and finite resolution. In this paper, a direct actuated digital servo valve was applied in electrohydraulic static loading system. It can be driven directly by computer needn’t D/A and has the advantages of simple structure, high tolerance to contamination and high reliability. Practical load-experiment results show that the static loading system with a direct actuated digital servo valve can work steadily and reliably and possess high accuracy and fast response.
Comparative Analysis of Two Land Surface Temperature Retrieval Algorithms Based on Multi-Source Remote Sensing Data
Authors: Zheng Wen Wu , Zeng Yong Nian
Published: October 2011

The main disadvantage of Land surface temperature (LST) retrieval methods from Landsat TM thermal channel images is that atmospheric profile parameters are needed, and MODIS has several near infrared bands that can be used to estimate atmospheric profile parameters. Two methods that could be used to retrieve the LST from Landsat TM and MODIS data were compared in this paper, the first of them is the mono-window algorithm developed by Qin et al. and the second is the single-channel algorithm developed by Jimenez-Munoz and Sobrino. Atmospheric profile parameters such as atmospheric moisture content, atmospheric transmittance and average atmospheric temperature have been estimated from MODIS data, and the land surface emissivity values have been estimated from a methodology based on spectral mixture analysis. Finally, a comparison between the LST measured in situ and retrieved by the algorithms over urban area of Changsha city in China is present. Result indicates that the two LST retrieval algorithms can get high-precision results in support of atmospheric parameters from MODIS images, the average deviation of mono-window algorithm is 0.76K, and the deviation of generalized single-channel algorithm is 1.23k.
Research on the Array Type Infrared Radiation Thermometer
Authors: Jiang Xiao Yu , Zhong Sheng , Wei Zhen
Published: October 2011

In recent years, infrared temperature-measuring attracted more and more attention from home and abroad. Infrared temperature-measuring is non-contact and does not destroy the temperature distribution of the measured target object. At present, infrared radiation thermometer (point thermometer) and thermal infrared imager are wildly used. They both have advantages and disadvantages. The array type infrared radiation thermometer discussed in this paper contains the advantages of IR thermometer and thermal infrared imager and could measure the multi-point of the target’s surface simultaneously and accurately. Its basic principle is to obtain array processing to the infrared detector, simultaneously measure the multi-point temperature of the objects, take the measured object as a benchmark to calibrate infrared radiation thermometer so as to solve the problem of radiation rate fixed difficulties and improve accuracy of radiation temperature measurement.
Design of Three Voltage Level Test System for Auto Sensor Based on LabVIEW
Authors: Tian Jin Ming , Zhang Lei , Gong Cheng Long , Ji Lin Hai
Published: October 2011

A set of data acquisition terminal for automotive sensor three voltage level signal performance testing is designed. It is connected together to form a complete set of automotive sensor performance test monitoring system using NI-6259 data acquisition card and PC data collection terminal. The system can display real-time maximum, minimum and average of high voltage level, middle and low, duty cycle, frequency, and flipping or not. The measured signal frequency range is 1Hz~2.5 KHz. The measured data and the specified range of data interface is contrasted, automatically determined whether it is reasonable, and classified saved.
Fiber-Optic Sensing of Coal Mine Gas Based on Fabry - Perot Interferometer
Authors: Zhou Meng Ran , Wu Di , Zhang Hai Qing
Published: October 2011

In this paper, According to mine gas accident frequent and the shortages of traditional gas monitoring system, puts forward some eigenvalue fabry-perot interference (EFPI) technology, its spectrum domain to study the mechanism of white light interference demodulation . establishing the wavelength fiber methane sensor system, realized the sensing information high resolution, wide measuring range and do not suffer light wave, the spectrum domain influence of disturbance synthesis technology. Experimental results show that have an accurate measurement results, it can be applied in underground bad environment method of measuring gas concentration, the research may realize all fiber optical signal measurement, underground only, no electrical signals, strong anti-jamming capability, suitable for inflammable, explosive and other environmental.
The Application of Temperature Sensor TMP36 and the Assembly Algorithm of Multidigit Decimal Resolving
Authors: Ren Yong Jie , Ding Xiao Hua , Yang Xue You
Published: October 2011

A kind of high reliability and high-precision division operation achieved by 8051 series SCM was discussed; the algorithm eliminated the limitations of system’s unsigned division through the iterative multiplication. Combined with the application of the TMP36 temperature sensor, the experiment demonstrates that the result is accurate, the algorithm has the advantages of simple algorithm, strong adaptability and high reliability, etc, it is very practical.
Overview of Chemical Characterization of Biomass Fast Pyrolysis Oils
Authors: Lu Qiang , Zhang Zhi Bo , Zhang Cai Juan , Su Shu Hua , Li Wen Yan , Dong Chang Qing
Published: October 2011

Fast pyrolysis of biomass to produce bio-oil is one of the most promising technologies to utilize lignocellulosic biomass. Liquid bio-oil covers many potential application fields, to be used a fuel or a source for chemical extraction and production. Hence, it is necessary to understand the chemical properties of bio-oil. This review concentrates on the elemental and chemical properties of bio-oil, and also discusses the analysis and separation methods.
Multi-Sensor Combination Intelligent Vehicle Control System’s Design Based on HCS12X
Authors: Han Yi Lun , Wang Bin Long , Wen Xue Lei
Published: October 2011

In this paper, the intelligent vehicle control system’s design based on HCS12X MCU.The Multi-sensor combination technology be used in this control system. This system can control vehicle's position and Navigate the vehicle with GPS, vision sensor and laser radar sensor. This control system have an optimal decision in safety, reliability and handleability. The experiment showed that the smart vehicle can driving in the designed road by itself.
BISS: A Built-In SEU Sensor for Soft Error Mitigation
Authors: Huang Zheng Feng , Yi Mao Xiang
Published: October 2011

This paper presents a built-in SEU sensor (BISS) to detect soft errors in CMOS digital systems. BISS detects SEU-induced soft errors by monitoring the meta-stability in the flip-flops. BISS includes positive pulse generator, footed dynamic inverter and keeper. SPICE simulations validate the approach. Experiments show minor overhead in terms of area. BISS can yield 80% error coverage at the cost of 22% area overhead. As its prominent advantage, insertion of BISS will incur minimal performance degradation.
Research on Control Strategy of Grid-Side Inverter in Direct Drive Wind Power System
Authors: Wu Xiao Na , Wang Song
Published: October 2011

Aimed at the influence of grid power quality suffered from the wind turbine, a new control strategy for grid-side inverter of direct drive wind power is proposed, that is voltage loop is controlled by ADRC and current loop is controlled by PI controller. The simulation results show that the system with new control strategy has stronger robustness, better steady state and dynamic characteristics, compared with the traditional control strategy that is voltage and current loops are both controlled by PI controller. Obviously, grid-connected power quality has been improved.
A Design of the Device for Lower Limbs Rehabilitation and Simulation Analysis
Authors: Wang Yong , Zhang Ying , Li Ji Fen
Published: October 2011

Based on the positional characteristic of ellipticorbit of four-bar linkage, we develop a device to support rehabilitation of a patient’s lower limb’s motion in two-dimensional plane. In addition, we use ADAMS software to analyze two aspects parameters. One aspect is about the horizontal and vertical displacement of four-bar mechanism of ellipticorbit. The other simulation is about angles θ1 (angle between thigh and the horizontal) and θ2 (angle between thigh and calf). Before using the device, we install them in both sides of a normal chair. Driven by electric motor, lower limbs can follow the trajectory to do rehabilitation exercise. Long-term exercise can help a patient to repair damaged muscles.
Synthesis and Performance of Molecular Imprinted Polymers as Drug Release Controller
Authors: Chu Hui Juan , Wei Hong Liang , Zhu Jing , Nong Chun Ping
Published: October 2011

Molecular imprinted polymers were synthesized using α-methylacrylacid as monomer, acetylsalicylic acid as template. Polyethylene glycol dimethylacrylate was taken as cross-linker. UV-Vis spectrophotometer was used to detect the drug-loading and releasing performances of these polymers. The studies showed that the imprinted polymers could load more drugs than non-imprinted polymer, and exhibited a slower drug-releasing rate than the latter at pH 7.4. The content of cross-linker had influences on drug-loading amounts. The imprinted polymer released few drugs at the buffer solution of pH 1.2.
Study on Compound Cross-Flow Liquid-Liquid Extraction for Separating Methylal-Methanol Azeotropic System
Authors: Lin Jun , Huang Qun Qun , Zhu Jing Jing , Gu Zheng Gui
Published: October 2011

Aiming at the raw material of a methylal-methanol azeotropic mixture (including 91.8% of methylal, 8.2% of methanol), With a certain proportion of the composite solvent as extracting agent, over 99.5% purity of methylal can be obtained with two-stage cross-flow liquid-liquid extraction combining distillation operation, while the compound extracting agent can be recycled. Compared with the traditional methods, the new technology has more obvious methanol removing effect, higher product purity, higher recovery ratio (>95%), and lower energy consumption. It’s a new feasible scheme to Separate methylal-methanol azeotropic system.
Modeling and Simulating on Star Map Genetation for All-Sky
Authors: Jiang Hao , Xue Yan , Liu Guang Bing , Fan Xiao Yu
Published: October 2011

Based on the SAO catalogue, it is presented an approach for modeling and simulating on star map genetation for all-sky. All this can be done with the SAO catalogue in the following way. First, with time conversion, the star position eliminated the effect of the proper motion. Next, throught conversion of precession, nutation and aberration, it gived the star position of the observation named time. Finally, it transformed position coordinates and grayness of star sensor’s parameters in any time and at any places.
A Generic Model for Spiral Groove Grinding
Authors: Lu Yan Ming
Published: October 2011

As to spiral groove grinding, convertionally was based on envelope theory, a formed wheel was needed to be designed and manufactured, and then this wheel was used to grind the specified spiral groove. This paper tried to find the other way to manufacture the specified spiral groove with common disc wheel or dish wheels. A generic model for groove grinding is presented in this paper. With the model, the groove geometries can be calculated under certain grinding parameters. The relations between the grinding parameter and groove geometries were studied numreically. A test was done and the results proved the model is correct. This technology make the spiral groove virtual machining possible. The technology is also a real DFM (Design For Manufacture), because the design process for spiral groove is the process for selecting manufacure parameters.
Modeling and Simulation of NC Precision Sphere Grinding Machine Feed Drive System
Authors: Li Dong Dong , Xu Ming Ming , Xu Li Ming , Hu De Jin
Published: October 2011

The feed drive system model of NC precision sphere grinding machine (MD6040) is constructed. Although a large number of researchers pay more attention on advanced controllers, most high performance machine tools still adopt PID (Proportion Integration Differentiation) controller today. In this paper, PDF (Pseudo-Derivative Feedback) controller and PDFF (Pseudo-Derivative Control with feedforward Gain) controller which evolved from PID controller are studied. The performance of PID controller, PDF controller and PDFF controller is investigated by simulation and experiment. Both simulation results and experiment results showed that PID controller has severe overshoot and less rise time, PDF controller has strong robustness and long rise time and PDFF controller possesses the advantages of the other two controllers. PDFF controller is more suitable for NC precision sphere grinding machine feed drive system.
The Application of Hydraulic System in Wind Turbine
Authors: Sun Hong Mei , Gao Ming , Nie Song Lin
Published: October 2011

As the global energy and environmental situation is serious, the wind energy as a clean, renewable energy，is got more and more world attention. Wind power technology is becoming the research focus of many countries. Hydraulic system with its high reliability and fast response characters is widely used in the rotor brake system, yaw brake system, pitch system.
A New Application Research of Time-Base Following Control in Non-Circular Contour Turning Lathe
Authors: Yao Xiao Peng , Yao Xiang Ying , Zhu Fan
Published: October 2011

On the base of analyzing the kinematics equations of non-circular machine tool, a new control algorithm is created by lathe tool kinematics principle, which based on the time-base method, in the non-circular machine tool have been verified on the experimental results show that the machining accuracy can be improved effectively. In order to obtain non-circular turning function relative to traditional CNC system, a new Open CNC systems was designed based on PMAC (programmable multi-axes controller) and linear motor. The research focused on the time-base following control between the CNC system and the linear servo systems used for the non-circular section turning. The advantages of the linear motor system directly driven by simple structure, quick transient response, high velocity and acceleration, high accuracy, little vibration and noise etc, which meets the requirements of manufacturing parts with non-circular section, and has been widely applied in the CNC forming and machining. To fit the crank non-circular contour, uses the high frequency linear servo motor to drive the tool move to-and-fro with high frequency, so the tool will track the crank non-circular contour with real time. With the results of several experiments for time-base following control with displacement feedback, the feasibility and efficiency of Open CNC system are verified.
The Dynamic Fault Tree Analysis of Not-Cutting Failure for MG550/1220 Electrical Haulage Shearer
Authors: Wang Wei Han , Zhang De Kun , Cheng Gang , Shen Li Hua
Published: October 2011

The electrical haulage shearer is an important coal mining machine, and the reliability of cutting unit plays an important role in improving the production efficiency. First of all, the dynamic fault tree of not-cutting failure for the MG550/1220 electrical haulage shearer was established. The dynamic fault tree was analyzed by the binary decision diagram and Markov method in the manner of modular approach. Eventually, the minimum cut sets, the top event unreliability and the importance measures of dynamic fault tree were obtained. Research shows that the improper installation of first shaft bearing, the cage off of the first shaft bearing, the cutting motor damage and the poor quality of lubricating oil are the principal contributor to the not-cutting failure of the shear. Consequently, these parts should be given more attention in the optimization design and routing maintenance.
Modeling and Development of Gap Adjustment Automatically Technology for Offset Machine
Authors: Gao Zhen Qing , Wang Yi Ming , Bai Jian Jun
Published: October 2011

Aiming to the advantages of traditional manual mechanical adjustment for gaps between key parts of offset machine, a method for gaps adjusting automatically was proposed and a prototype of adjusting device based on BR622 offset machine was formed. In this research, the principle of adjustment automatically was discussed, the configuration with the ARM controller as core of adjustment automatically system was designed, the control software process was analyzing and a prototype was developed. The method of automatic adjustment for gap can simplify the operations and has practical significance.
Reliability Design of Agricultural Products
Authors: Wang Hong
Published: October 2011

In recent years, agricultural products are evolving to dynamic and multiplicity. With the product features improved, the capacity and parameters increased and development to the mechanical and electrical integration, The product structure is in increasing complexity and the use conditions increasingly harsh, so the product fault and potential for failure is growing, reliability issues become increasingly prominent. Has analyzed the reliability characteristics of agricultural product, proposed the principle and method of reliability design using reliability project theory. it is very important for improving the quality and reliability of agricultural product and the majority of agricultural design workers must rise to attach great importance.
Straightness Apparatus in the Automatic Control Design Deep Hole
Authors: Shu Liu Yan , Ning Yan Pin
Published: October 2011

In this paper, the instrument is designed by basing on principle of the measurement method of straightness error measurement of deep hole, the design technologies of A/D converters, automatic control and computer are used. The instrument can automatically acquire data, the process of acquire data is convenient, fast, safe and the data is reliable.
Fast Multipole Boundary Element Method for 3-Dimension Acoustic Radiation Problem
Authors: Zhang Bing Rong , Chen Jian , Chen Li Tao , Zhang Wu
Published: October 2011

In order to reduce computational complexity and memory requirements using conventional boundary element method (CBEM) for large scale acoustical analysis, a fast solving algorithm called the Fast Multipole BEM (FMBEM) based on the fast multipole algorithm and GMRES iterative solver is developed without composing the dense influence coefficient matrices. The multipole level structure is introduced to accelerate the solution of large-scale acoustical problems, by employing a concept of cells clustering boundary elements and hierarchical cell structure. To further improve the efficiency of the FMBEM with iterative solvers, a block diagonal matrix method is used in the system of equations as the left pre-conditioner. Numerical examples are presented to further demonstrate the efficiency, accuracy and potentials of the fast multipole BEM for solving large-scale acoustical problems.
Hybrid Fuzzy PID Control for Synchrodrive System of Dual Linear Motors
Authors: Wan Ren Yi , Zhang Yu Zeng , Sun Hong Hui , Zhou Wei , Chen Zhuo Jun
Published: October 2011

In this paper, a synchrodrive scheme for dual linear motors position servo system in gantry moving type milling machine is presented. The feedforward control, disturbance observer and electrical cross coupled control algorithm based on fuzzy PID are applied to the position servo system to counteract the influence of mechanical coupling rapidly, and then meet dynamic synchronized performance in machining. From the simulated, the results show that the proposed control method is effective and yield superior performance.
Numerical Simulation of Hydroxyapatite Particle Impacting on Ti Substrate in Cold Spraying
Authors: Zhang Lei , Zhang Wen Tao , Wu Zhi Yong
Published: October 2011

Hydroxyapatite (HA) is a calcium phosphate ceramics and HA coating is essential for the medical metallic implants. This paper presents a computational model of HA particle impact behavior in cold spraying. The impact pressure at the predefined contact surface between the HA particle and the Ti substrate is investigated numerically using ABAQUS/Explicit. The effects of particle size, particle velocity and substrate temperature on the impact pressure are examined. A Taguchi’s orthogonal array is employed to arrange the simulation conditions and the simulation results are analyzed to reveal the main factors influencing the impact pressure, which provides a better understanding of the bonding mechanism during cold spraying.
Influence of Material Microstructure on Micro EDM
Authors: Li Jian Zhong , Shen Fei Hu , Guo Mei Gang
Published: October 2011

In conventional electrical discharge machining (EDM), the workpiece material is considered as homogenous material. When a micro feature is machined in alloy by micro EDM, microstructure of alloy may be of the same order as the micro feature. This may lead to the variation of machining performance of micro EDM. This paper demonstrates the influence of material microstructure on the machining performance by drilling micro holes within the crystal grain and on the boundary of TA0-1. Experimental results indicate that the average values of material removal rate, tool wear ratios and the discharge gaps on different locations are different because their material properties are different.
Strengthening Mechanisms of Vanadium Micro-Alloyed Reinforcing Steel Bar
Authors: Li Lie Jun , Huo Xiang Dong , Guo Lin
Published: October 2011

High strength vanadium micro-alloyed steel with yield strength of 600MPa has been developed based on commercial 20MnSi steel bar. Experimental methods, such as OM, SEM and TEM, were used to study the experimental steels. Compared with 20MnSi, steel 20MnSiV boasts much finer microstructure, and large numbers of nanometer precipitates exist in the specimens of 20MnSiV. Analysis shows that strength of 20MnSiV dramatically increases through grain refinement strengthening and precipitation hardening of nanometer VCN particles.
Influence of Variable Swirl Intake Manifolds for DI Diesel Engine on in-Cylinder Air Motion
Authors: Xin Xi , Liu De Xin , Wang Liu Qing , Wang Li
Published: October 2011

This paper developed a new design of variable swirl intake manifolds for four-valve DI diesel engine by setting swirl control valves in the intake manifolds. The 3-D numerical model under the same experimental condition was established and particular flow information in intake manifolds and cylinder was achieved. Influence of variable swirl intake manifolds on intake flow characteristics and in-cylinder swirl characteristics were analyzed. The simulation results show that the swirl intensity in cylinder can be tuned by this device. The swirl intensity increases gradually with decrease flow coefficient and it can meet the requirements of swirl intensity for different operating conditions.
Research on Water-Lubricated Bearing Applied in Propulsion Improvement of Certain Type of Motorboat
Authors: Li Fu Long , Han Tan
Published: October 2011

With energy price and environmental pressure increasing, water-lubricated bearing has been further applied in ship propulsion system. By analyzing structure characteristic of propulsion system, especially propeller shaft system of the certain type of motorboat, the improving design is proposed that water-lubricated bearing made by new improved material of MC nylon is used to substitute the oil-lubricated bearing. The abrasion characteristics test for improved motorboat bearing is made, which is analyzed by way of comparison with material sample test to predict useful life, and its environmental suitability analyzed. The results show that the bearing improvement of motorboat propulsion system has met the using requirements, and improved propulsion reliability, lowered fuel consumption, avoided water pollution, saved maintenance costs, and been the significant social and economic benefits.
A Class of Optimizations and Energy-Saving Application
Authors: Yao Fu Lai , Sun He Xu
Published: October 2011

This paper presents a class of optimization functions, and gives the optimal value. The optimal conclusion is applied to energy optimization for general devices. When the total load is fixed and the devices are used with same model, the optimal control method is given: adjusting each device to the same load, the minimum energy is required.
The Construction of Marketing-Distribution Integrated System
Authors: Wang Wen Bo , Wang Lei
Published: October 2011

With the development of economy, the acceleration of urbanization and the promotion of living standards, power users have put forward higher requirement of the power quality and reliability. The traditional methods of management can not satisfy the demands of users. Therefore, the power supply enterprises need to make use of the advanced technology to improve the technological and automation level. The marketing-distribution integrated system which takes the GIS platform as the basis, the users’ demands as the orientation, is comprehensive and cross-business application system. It can improve the level of management obviously. This paper proposes the construction aims, construction principles, the frame of information platform and application platform which are critical for the integration system.
The Control System Model of Gantry Crane for Preventing Swing
Authors: He Kong De , Fang Zi Fan , Zhu Da Lin , Yang Wei Hua
Published: October 2011

This paper aimed at the phenomenon of swing which caused by inertia force and outer loads when gantry crane worked, the dynamical equation and state space equation were founded based on Lagrange, analyzed the swing phenomenon by LQR linearity secondary optimal control method, and simulated the equation by MATLAB software, through the results, the conclusion can be got that this method could reduce time for crane swing and improve the precision of orientation and working efficiency, this method had important meaning for improve the security and working efficiency for gantry crane, which can be extended to other crane too.
The Design of High Voltage DC Power Supply of 4.6GHZ/500MW LHCD
Authors: Hao Xu , Huang Yi Yun
Published: October 2011

The steady-state and transient performances of the power supply system of LHCD (Lower Hybrid Current Drive) heating system are highly demanded which makes it difficult to design the power source. In this thesis, the method of designing the 4.6GHZ/6MW power source of LHCD of EAST is discussed. And the results of the experiment are provided and some special characteristics are analysed to prove the accuracy of the method.
Wireless Temperature Measurement and Alarm Device Based on Single Bus Digital Temperature Sensor
Authors: Dong Li Mei
Published: October 2011

AT89S52 microcontroller was the center controler for wireless temperature measurement and alarm system, through temperature measurement circuit and remote wireless alarm circuit, realized the temperature detection and off-limit alarm of the ambient temperature. The system was composed of temperature acquisition circuit, display circuit and alarm circuit. Temperature sensor was DS18B20, real-time temperature displayed via LED displayer. Users can customize the alarm lower limit and superior limit. when the ambient temperature exceeds the alarm limit, the microcontroller will start the sound and light alarm, and remote wireless alarm. Temperature measurement range from -40 °C to +85 °C, measurement accuracy is 0.5 °C, wireless alarm distance is up to 100 meters. This system is of high precision, wide temperature measurement, and timely alarm.
A Fast Reactivation Scheme in Power Gating Design
Authors: Huang Ping , Xing Hui Yuan , Yang Xian Ju , Yan Pei Xiang , Zhao Tian Lei , Xing Zuo Cheng
Published: October 2011

Power gating has become a popular technique to reduce the ever-increasing leakage power for commercial microprocessors or SoCs, however the wakeup energy and delay cost harm its performance. This paper proposes a fast reactivation scheme to reduce the transition delay and energy. The experiment results show that, comparing to the traditional power gating implementation, it can achieve 19.66% reactivation energy reduction, 9.28% peak leakage reduction, and 23.36% wakeup delay reduction, at the cost of 2.75% area increasing.
An Energy-Efficient Data Gathering Method for Sensor Networks with Mixed Communication Modes
Authors: Yuan Hui Yong , Liu Ze Ping , Yang Si Qing
Published: October 2011

One critical issue in wireless sensor networks is how to gather sensed information in an energy-efficient way since the energy is a scarce resource in a sensor node. Cluster-based architecture is an effective architecture for data-gathering in wireless sensor networks. In this paper, by taking the nodes energy consumption into account, we first derive the optimal number of clusters for data gathering in sensor networks. To balance the cluster heads energy consumption, we propose a mixed communication modes where the cluster heads can transmit data to the base station in either single-hop or multi-hop. We then develop a data gathering method based on the optimal number of clusters and mixed communication modes. The simulation results show that the proposed method outperforms LEACH and HEED in terms of network lifetime by balancing energy dissipation.
A False Negative Maximal Frequent Itemsets Mining Algorithm over Stream
Authors: Li Hai Feng , Zhang Ning
Published: October 2011

Maximal frequent itemsets are one of several condensed representations of frequent itemsets, which store most of the information contained in frequent itemsets using less space, thus being more suitable for stream mining. This paper focuses on mining maximal frequent itemsets approximately over a stream landmark model. A false negative method is proposed based on Chernoff Bound to save the computing and memory cost. Our experimental results on a real world dataset show that our algorithm is effective and efficient.
Analysis of One Proxy Re-Encryption Scheme
Authors: Liu Li Hua , Cao Zheng Jun
Published: October 2011

Unlike some earlier proxy re-encryption schemes, the LV08 scheme specifies a validity-checking process to guarantee that the received ciphertext is well-formed. In this paper, we clarify that the received message is well-formed is the premise to decryption in all encryption schemes. The underlying mechanism to keep the communicated message well-formed in encryption schemes is another topic. We will simplify the LV08 scheme and show its security level is the same as that of the AFGH05 scheme.
Attacks on Self-Certified Multi-Proxy Signature Schemes with Message Recovery
Authors: Xie Qi
Published: October 2011

Signature schemes with message recovery based on self-certified public keys can reduce the amount of communications and computations, since the signature verification, the public key authentication and the message recovery are simultaneously carried out in a single logical step. Integrating self-certified public-key systems and the message recovery signature schemes, in 2009, Wu et al. proposed two multi-proxy signatures based on the discrete logarithms over a finite field and the elliptic curve discrete logarithms. The proxy warrant revision attacks are proposed, and it will show that Wu et al.’s schemes can not resist the proxy warrant revision attacks by either the proxy group or the original signer.
Design and Implementation of VSP Seismic Data Acquisition System Based on Virtual Instrument Technology
Authors: Sun Nai Quan , Yang Yong Mei , Dong Rui Jing
Published: October 2011

Near earth surface can be seen as viscoelastic medium. It’s important to collect VSP seismic signal in near-surface.This paper proposed plan designed for VSP seismic data acquisition system based on virtual instrument technology. This design applied the characteristic that the virtual instrument technology has strong capability in single processing and more abundant, distinct expression to VSP acquisition system. This design makes the acquisition system simple, expand easily. And it provides a practical and useful testing tool to logging exploration of near surface project.
Design of Gas Leakage Monitoring System Based on CAN Bus
Authors: Chen Yi Jing , Zan Hong Yang , Li Wen Gui
Published: October 2011

In view of the natural gas leakage monitoring status, a distributed monitoring system is designed based on CAN bus, which is composed of Master Controller, CAN bus, and data acquisition modules, etc. As well as the circuit diagram and the flow chart of software are introduced in detail. The results indicate that the distributed natural gas leakage monitoring system can fulfill the task of gas leakage state display and alarm successfully in laboratory test, by using distributed structure, the system can be easily expended, and it has the character of reliability and flexibility.
Directional Human Fall Recognition Using a Pair of Accelerometer and Gyroscope Sensors
Authors: Lim Myeong Jun , Cho Jin Ho , Cho Young Sun , Kim Tae Seong
Published: October 2011

Human fall in the elderly population is one of the major causes of injury or bone fracture: it can be a cause of various injuries (e.g., fracture, concussion, and joint inflammation). It also could be a possible cause of death in a severe case. To detect human fall, various fall detection algorithms have been devised. Most fall detection algorithms rely on signals from a single accelerometer or gyroscope and use a threshold-based method to detect the human fall. However, these algorithms need careful adjustment of a threshold for each subject and cannot detect the direction of falls. In this study, we propose a novel fall recognition algorithm using a pair of a tri-axial accelerometer and a tri-axial gyroscope. Our fall recognition algorithm utilizes a set of augmented features including autoregressive (AR) modeling coefficients of signals, signal magnitude area (SMA), and gradients of angles from the sensors. After Linear Discriminant Analysis (LDA) of the augmented features, an Artificial Neural Nets (ANNs) is utilized to recognize four directional human falls: namely forward fall, backward fall, right-side fall, and left-side fall. Our recognition results show the mean recognition rate of 95.8%. Our proposed fall recognition technique should be useful in the investigation of fall-related injuries and possibly in the prevention of falls for the elderly.
Fatigue Lifetime Design of Pantograph V500 Based on Reliability
Authors: Song Dong Li , Zhang Wei Hua , He Ping
Published: October 2011

Reliability analysis of structure fatigue has two assignments: a. To forecast lifetime of the structure on given reliability level, b. To evaluate reliability level of the structure on given service conditions, material features and designing dimensions. It aims at evaluating the structure’s designing quality and providing a basis for designing improvement or manufacturing. At mean time, it provides instruction to updating management by parameter of failure rate under given fatigue lifetime.Lastly, in form of tables, this paper presents the predicting results of fatigue lifetime of pantograph V500 based on different reliability levels at 500km/h and the predicting results of reliability level of Pantograph V500 under lifetime of 1,200,000km which provide direction of design, manufacturing and general management for Pantograph V500.
Narrow-Band Interference Suppression in Transform Domain in Tracking and Data Relay Satellite System
Authors: Gong Ping , Xie Hui Jun , Liu Yu Peng , Wu Xing Cun
Published: October 2011

This paper use the methods of lapped transform to implement DSSS system narrowband interference suppression in lapped transform domain. Interference suppression in part, by improved median filter algorithm in a treatment process can locate and suppress interference, and it will not be activated in the absence of presence of interference, thus saving processing time. From the results of Matlab simulation, we can see the structure based on the analysis of lapping transform that has good performance in anti-narrowband interference, so it will be widely used in the tracking and relay satellite communications system.
Research of Cleaning and Quality Control of Data in Investment Research System of Fund Management Company
Authors: Guo Qiang , Liu Ying , Fu Ran Ran
Published: October 2011

The consistency of the meaning of data in data warehouse is a key factor that affects the applications based on the data warehouse. In this paper, a system of cleaning and quality control of data in investment research system was built after investigating the estimation system, TA and other business systems of fund management company and analyzing the requirement of users. The system consists of an ETL program, and other products such as oracle, oracle stored procedures. This design approach can meet business requirements, ensure system scalability, simplify the complexity of the development of ETL program and improve the maintainability of the system. The method used in this paper has a high reference value for design and development of application systems that had the same characteristics.
Research of Information Retrieval Based on Web Semantic Similarity
Authors: Yu Y.X. , Wang L.Y.
Published: October 2011

An important research of information retrieval technology is how to express the intention of users accurately and make a sensible judgment on the semantic similarity between conceptual entities. A scheme is presented to calculate the semantic similarity, which takes multi-inheritance of entities and property values into consideration , and then optimizes the computing process based on the tree structure of inheritance relationship. When the instance multiple inheritances are relatively complex, the accuracy rate is more pronounced than existing methods. The experimental results show that the scheme proposed in this paper can calculate semantic similarity more accurately even in ontology-based knowledge base.
Research on Signal of Branch Junction Based on Adaptive Fuzzy-PID Control
Authors: Ju Yong Feng , Zhao Le , Gao Shang
Published: October 2011

With the rapid development of the urbanization, the problem of city transportation has been becoming the same issue to each big city in China. As the converge points of urban traffic, the branch junctions are playing important role in the road net and traffic flow. It is true that traditional PID control algorithm is widely used in various control systems. Because its principle is simple and easy to build and has no error in the steady state, etc. However, it does not have a good adaptability towards the change of parameters. It is inferior towards interference, etc. According to the above situation, a adaptive Fuzzy-PID control algorithm is proposed which has returned the characters of regular PID control algorithm. The fuzzy control algorithm is used to realize the on-line regulating relative PID parameters. The simulation analysis indicates that the presented method is effective to improve the main road control.
Research on the Doppler Shift Mitigation Scheme for OFDM Underwater Acoustic Communication
Authors: Chang Qing Wen , Shen Xiao Hong , Chang Juan
Published: October 2011

Doppler shift decreases the estimation accuracy of carrier frequency and may result in divergent estimation. It thus degrades the performance of orthogonal frequency division multiplexing (OFDM) underwater acoustic (UWA) communication system. In this paper, the two-step Doppler shift mitigation scheme[4] was adopted to mitigate the Doppler effect. The innovation lied in the second step in which an enhanced carrier frequency offset (CFO) two-time estimation approach on basis of the pilot was proposed to improve the Doppler shift mitigation scheme. In addition, the new Doppler shift mitigation scheme with the proposed approach was implemented in the OFDM communication system under the simulated multipath-spread channel environment. The experiment results show that the new scheme is able to improve the performance of OFDM UWA communication significantly.
Research on the Performance of Network Virtualization Based on Xen
Authors: Li Xu Dong , Lei Zhou
Published: October 2011

It is known to all that the performance of Para-virtualization virtualization machine is much better than full virtualization machine's. However, the full virtualization machine has advantage that it need not require modify the operating system kernel. Therefore we worked to improve the performance of network in the full virtualization environment. This paper provide a method to improve Xen network virtualization performance and so we could be both using the full virtualization machine without change the operating system and improve its performance to a high level.