bluuebunny/crossref_metadata_2025 huggingface dataset:
Speed Estimation Method for Sensor Less Control of AC Motor Drives Based on Stator Field Orientation
Authors: Chen Shou Qiang , Li Fan , Long Yu
Published: October 2011

Based on stator-field-orientation control combining with both direct torque control (DTC) and rotor-field-orientation control a speed estimation scheme is presented in this paper. Two key problems are discussed in detail. First is to use phase operation to decide stator-field-orientation angle θs and then the discrete-tracking-differential (DTD) technique is employed to high quality stator current. The experiments show that accurate speed estimation can be obtained by the method.
Damage Efficiency Research of PCB Components under Strong Electromagnetic Pulse
Authors: Xie Fei , Cao Bing , Liu Cheng Long
Published: October 2011

To study damage effectiveness of strong electro-magnetic pulse to components of equipments, the power density in area of MOS circuit, diodes and transistor of a computer is simulated, using the method of the finite-difference time-domain (FDTD). Coupling laws in different areas are achieved, and then judging the damage efficiency of components. Electromagnetic pulse reflects constantly in computer box, causing power density appears oscillations. Energy gradually declines to zero, for it radiates outward from slots. Field concentration around PCB board results in dissociation of field strength, and slows down the attenuation of energy. Finally, formula of power density at random field strength and rise time is also obtained.
Stress-Strain Analysis of Back-up Roll with Roll-Sleeve
Authors: Zhua Zhong Ying , Sun Deng Yue
Published: October 2011

The back-up roll with roll-sleeve was studied and simulated using the finite element analysis software Abaqus in this paper. The stress-strain field of back-up roll with different roll-sleeve thickness and different magnitude of interference were compared because these two parameters are of importance for us to guide the application of roll with sleeve.
Study of a New Electromagnetic Weft Insertion Mechanism Based on the PLC
Authors: Luo Sheng Mei , Zhang Bo
Published: October 2011

Based on the in-depth study of traditional weft insertion mechanism, the electromagnetic technology was introduced into the textile machinery, a new weft insertion mechanism was designed whose shuttle was moved fast in the shed by the electromagnetic force. The electromagnetic force was generated by electromagnetic coils. Meanwhile, the PLC control system which control the new electromagnetic weft insertion mechanism was devised to achieve the high speed of the shuttle.
The Research of High-Precision Interpolation for Complex Trajectory of SCARA Robot Based on NURBS
Authors: Zhao Liang , Chen Kai Qiang , Zhang Zhi Zheng
Published: October 2011

The traditional interpolation methods can’t get high-precision result for the path planning of industrial robot, to solve this problem, this paper presented a new interpolation method based on NURBS curve. The paper established the kinematics transformation matrix of SCARA robot, put forward the principle of NURBS curve interpolation, and described the details of trajectory planning for industrial robot in the rectangular space. Finally, the method mentioned in the paper was tested and compared with point to point interpolation method by Matlab simulations, the result showed that the method mentioned in the paper can reduce the interpolation error and the computational cost markedly.
PVA/PVAm Hydrogel Membranes for Removal of Metal Ions from Aqueous Solution
Authors: Chen Qiang , Zhu Lin
Published: October 2011

Glutaraldehyde cross-linked Poly (vinyl alcohol)/Polyvinylamine (PVA/PVAm) membranes for removal of metal ions from aqueous solution were prepared by solution casting and solvent evaporation techniques. The membranes were characterized using XRD, Swelling studies and metal ions adsorption experiments. The results show that PVA/PVAm membranes exhibit semi-crystalline natures as PVA macromolecular, however, the degree of crystallinity of membranes decrease as PVAm increased. The membranes were pH-sensitive and the swelling ability of membranes was significantly enhanced. It was found that the change of swelling behavior versus pH was consistent with the change of degree of ionization versus pH. The amount of Cu2+ions adsorbed increased as PVAm increased as well as increasing pH of solution in the range of 2.5~6.0.
The High Resolution Three Lateral Logging Response Research Based on MATLA
Authors: Han Ze Xi , Li Ya Ni , Wu Jie
Published: October 2011

The formation resistivity is a main parameter in logging interpretation and evaluation of oil and gas reservoir. And high resolution three-lateral logging is an important measuring method in resistivity logging. According to the present finite element program for three lateral logging concludes data and the powerful graphics capabilities of MATLAB, we study the relationship between potential or current and focusing characteristics. The results are important for how to design equipment parameters, and control the current focus to achieve the best focusing.
Compound-Fault Diagnosis of Bearing Based on Order Tracking Wavelet Packet and Rough Sets
Authors: Tian Guang , Tian Hao , Liu Guang Sheng , Zhao Jin Hui , Luo Li Ping
Published: October 2011

The diagnosis of compound-fault is always a difficult point, and there is not an effective method in equipment diagnosis field, then a new method of compound-fault diagnosis was presented. The vibration signals at start-up in the gearbox are non-stationary signals, and traditional ways of diagnosis have low precision. Order tracking and wavelet packet and rough sets theory are introduced in the compound-fault diagnosis of bearing. First, the vibration signals at start-up were resampled using computer order tracking arithmetic and equal angle distributed vibration signals were obtained, and wavelet packet has been used for equal angle distributed vibration signals decomposition and reconstruction. Then, energy distribution of every frequency band can be calculated according to normalization process. A new feature vector can be obtained, then clear and concise decision rules can be obtained by rough sets theory. Finally, the result of compound-fault example proves that the proposed method has high validity and more amplitude appliance foreground.
Dataflow Errors Detection in Business Process Model
Authors: Rgibi Ahmed Elajeli , Yao Shu Zhen , Xu Jia Jun
Published: October 2011

Despite the abundance of analysis techniques to discover control-flow errors in workflow designs, there is hardly any support for data-flow verification. Most techniques simply abstract from data while data dependencies can be the source of all kinds of errors. This paper focuses on the discovery of data-flow errors in workflows. There are many issues in the dataflow, like Redundant Data, Lost Data, Missing Data, Mismatched data, Inconsistent data, and Misdirected data. We present an analysis approach that uses so called “The RWD Boolean Table Technique” expressed in steps, I Split dataflow from control flow; II Create Boolean table for each data element/s; III Make comparative between RWD Boolean table for current task and next task until get the end of workflow; Typical errors include dataflow issue, like redundant Data, lost Data and missing Data.
The Research of Humanization Design for Coal Mine Machine
Authors: Xia Zhi Liang
Published: October 2011

Based on principles of humanization design, through the Human-Machine interface, Man-machine engineering, mechanical esthetics aspects of Coal Mine Machinery for “person-machine-environment” coordinate design research. This article make " humanization" design idea got fully manifests, change the former design of coal mine machinery simply focusing on product function, which pay more attention to the core content of product design, lay emphasis on the user comfort requirements, ascending users simple and efficient operation mode, satisfy user physiological and psychological needs. And thereby give the humanistic concern, make the products of coal mine machinery to be more comfortable and pleasant, what’s more, improve the added value of the heavy machinery products and showed the development direction of the modern coal mine machinery equipment.
Anti-Explosion Control System for Fine Powder Processing
Authors: Bing Xu , Ping Qian , Qian Xu Cheng , Hong Yuan Fang
Published: October 2011

This paper discusses the anti-explosion control system project for the fine powder processing. To prevent explosion, safety interlock control system is brought up. The article describes the hardware configuration and software establishment of the project, and makes suggestions for the project implement about sensor installing and program debugging.
Review on Automobile Steering-by-Wire System Development
Authors: Cong Zhou , Jian Xiao , Iqbal Muhammad Naveed
Published: October 2011

There is much advancement in steering control technology with time. Steering-By-Wire (SBW) system is the most modern and efficient technique. This paper first introduces current status and history of SBW system from concept proposal, prototype design and development of concept car with SBW system. The structure, principle, key components and classification of SBW system are also described systematically. Then several features of SBW system are analyzed in detail in connection with efficient handling, stability, spatial structure, intelligence and security of vehicle. Finally the future issues to be researched are discussed, including system reliability, hardware technology, system control strategy and power supply.
Analysis and Research on Braking Safe Performance of Long Distance Bus
Authors: Xu An , Qiao Xiang Ming
Published: October 2011

To define the situation of traffic safety about highway passenger transport accurately, and reveal the statistical regularity of braking safe performances on long distance buses, based on large sample braking performance detection of a given type long distance buses, the statistical models about 4 braking performance were established. This research shows that the unqualified rate of front axle braking force balance performance of the given type long distance buses beyond 24%, and the rear one is 7% as well, which could be one serious hidden danger. The models established have very high calculating precision. What makes this conclusion more persuasive is the relative error maximum between model calculating values and real detecting results is 0.428% only. In addition, the practicable direction and way to solve the exposed problem in vehicle braking system are given. The research results can be used to understand the braking performance statistical regularity of typical long distance bus accurately, providing a reliable technical guarantee for improving traffic safety.
AE Regularity of Coal Failure Shear Deformation Localization under Triaxial Dynamical Loading
Authors: Ren Fen Hua , Lai Xing Ping
Published: October 2011

Based on MTS-815.02 servo-controlled rock mechanics and acoustic emission (AE) integrated test system, the strength, shear deformation localization and damage AE-energy-rate characteristics process of coal specimen from Weihuliang Coal Mine under tri-axial loading were analyzed. A new model of Weibull distribution on the AE higher energy-rate emergence interval under tri-axial loading had been established, the total probability of coal sample localization failure in an interval is proposed. Then, the forecasting analysis of the coal fracture failure can be studied. The results indicate that the Weibull distribution of the AE higher energy-rate emergence were similar to the experimental results that measured. It is very important to the identification and ration prediction of coal failure in the mining.
A Method to Design Common Product Platform Based on Structure Matrix Analysis
Authors: Zhu Bin , Li Hong
Published: October 2011

Design for product family is an efficient way to guarantee the idea of mass customization to be implemented successfully. This paper presents an approach to architecting a product family that aims to provide methodological guidance for enterprises which plan to implement strategy of product family design. Based on the conventional methodology of designing for a single product, this paper respectively demonstrates the methods of requirement modeling, function-principle modeling and structure modeling in details according to the characteristics of product family design, and also some key approaches in different design processes are presented.
Detecting Centroid for a Quadruped Robot with Hand-Fused Foot Based on ARM
Authors: Wang Xin Jie , Yang Zhi Lin , Zeng Xian Quan , Zhang Yu Xiao
Published: October 2011

Because weight is unsymmetrical for the robot with hand-fused foot, a method is found to calculate the centroid coordinate from the perspective of Newtonian mechanics. Centroid coordinate of the robot is detected using ARM, pressure sensors, distance measuring sensors, and multiplexer. Software is designed for the centroid detection from 3 aspects as multiplexer chip selection, A/D conversion operations, and centroid calculation. Centroid projection detection has certain reference value for gait generation and path planning.
The Design of Temperature and Humidity Control System in Multi Incubators Based on Fuzzy Control
Authors: Wang Rui Lan
Published: October 2011

Hatching systems requiring high control accuracy of temperature and humidity. Particularly temperature, small temperature change will significantly affect hatching time and hatching rate；and temperature and humidity is the controlled amount of interaction between two. Due to the coupling characteristics of temperature and humidity is difficult to establish a precise mathematical model, caused uncertainty in its control. Fuzzy control method witch proposed in this article will not only improve control precision, and to improve the robustness of control algorithms and adaptive capacity.
Automatic Defect Extraction and Segmentation in Welding Seam Based on X-Ray Images
Authors: Wang Ming Quan , Wang Yu
Published: October 2011

In light of the characteristic of thin-wall weld joint in X-ray image, Flaw-edge extraction algorithm and image enhancement algorithm which is based on mathematical morphology are proposed in the study of flaw extraction technique. Therefore, the area of flaw and background can be removed successfully. On this basis, there are two algorithms to identify different flaw types: one is that spatial domain transform to extract flaw edge for clack, the other one is mathematical morphology which is combined with iteration threshold to extract flaw edge for pore; Experimental results show that both of algorithms can implement flaw extraction and segmentation automatically, which is lay a good foundation for flaw feature parameter extraction and recognition.
Research on On-Line Oil Monitoring System for High Power Mining Gearbox
Authors: Huang Xue Wen
Published: October 2011

In order to realizing real-time on-line oil monitoring for high-power gearbox’s wear state during operation, a monitoring system is developed on the basis of the ferrograph sensors in this paper. By means of a multi-level monitoring system, a real-time remote monitoring and analysis system of unattended machine wear condition is achieved which can real-time display the image of the wear particles and the wear information of the gears, thus getting such advantages as timely notice and warning, reducing equipment’s damage and maintenance costs . The initial application of system on the real machine shows good results and effects.
Simulation and Comparison of Adaptive Detection Algorithm
Authors: Wang Yun Liang , Li Guo Cun
Published: October 2011

The active power filter has two key link for harmonic current detection and respectively compensation current tracking. This article mainly aims at harmonic current detection link. Firstly, Analysis adaptive harmonic detection methods, then based on over to LMS (Least Mean Square) adaptive algorithm as the research object, in discussing the adaptive algorithm criteria. By comparing several simulation-based LMS algorithm to achieve the results of the filter,analyse the causes of the results.
Analysis of the Tire Temperature Distribution Based on Tests
Authors: Guo Xue Liang , Zuo Shu Guang , Li Yong
Published: October 2011

In order to study the change of the tire surface temperature during tire running, tire surface temperature experiments were made with the automobile rotary drum, the thermovision infrared equipment etc. Through the tests we got the temperature distribution of the tire surface during the tire rolling and after the tire stopped. Then the temperature distribution is analyzed.
Fault Ride through of Doubly Fed Induction Generator Wind Turbine Based on Supercapacitors Energy Storage
Authors: Zou He Ping , Yu Peng , Sun Hui , Zou Ji Yan , Liu Jian , Liu Yan
Published: October 2011

This paper proposes a low voltage ride through (LVRT) scheme of doubly fed induction generator (DFIG) based on the supercapacitors energy storage. The novel control strategy of the bi-directional converter and the grid side converter is established. Simulation model of the DFIG system is developed. Simulation results show that the presented scheme can efficiently reduce the DC-link overvoltage, supply reactive power to the power system through grid side converter, and help grid recovery under system fault, improving the LVRT capability of the system.
Research on the Model of Instantaneous DUO and Simulation
Authors: Shi Shi Ying , Fu Dao Chun , Tang Wei Fang , Huang Wei Dong
Published: October 2011

The transportation network dynamic port and the correlation question are in the intelligence transportation system the transportation flow the induction the core theory. This article has first studied the immediate road section transportation time dynamic user most superior assignment characteristic and the road section equation of state, and has established the immediate road section transportation time dynamic user most superior assignment model. In the third part, mainly discussed but should grasp for the time discrimination and the Frank-Wolfe algorithm which the solution immediate dynamic user route selection model; the article finally uses the example through the test, to the model which establishes has carried on the simulation.
Quadrilateral Grid Automatic Generation Algorithm and its Application for Multi-Media and Complex Domain
Authors: Fu Cheng Hua , Zhou Hong Bo
Published: October 2011

The improved advancing front method is proposed for quadrilateral grid automatic generation and used in multi-media and complex domain. Background grid does not need to be given first, multi-media complex domain is divided into several closed sub-domains, information of points and lines from these closed sub-domain boundary is automatically extracted from the AutoCAD model, the generation of internal node is controlled with mesh density parameters and topology relation of points and lines from the closed domain. Grid density is controlled by the global density parameter and the relative size of adjacent sub-domains. Mesh quality evaluation system and multiple refinement measures are used to improve grid quality. First, the whole domain is divided into triangle meshes, after optimizing these triangle meshes, quadrilateral elements are obtained by combining or dividing these triangle elements, good quadrilateral meshes are obtained by these optimization measures. Finally, a railway embankment example shows its feasibility and reliability.
Reconfigurable Design and Implementation of Data Extraction and Permutation Facing Stream Cipher Algorithm
Authors: Gao Fei , Dai Zi Bin
Published: October 2011

For design of a class of stream cipher algorithm reconfigurable coprocessor, it is necessary to realize efficient and flexible distribution between the initial chaos source generator and nonlinear transformation unit. From the analysis, it can be seen that the data distribution should have any data extraction and repeatable permutation characteristics. In this paper, design of data distribution network’s main circuit based on Inverse Butterfly network and Crossbar network is presented. And an algorithm of control information generation is given. By analysis and comparison with other realization ways, this design can save 16% hardware resources.
Ergonomics Evaluation of Mobile Maintenance Shelter with Fuzzy AHP Method
Authors: Liu Ning , Wu Lei Ming , Wang Min , Niu Yong , Zhang Yan , Wang Wen Zhao
Published: October 2011

Fuzzy AHP Method is applicable to estimate ergonomics of mobile maintenance shelter. Workload, usability and user questionnaire grade are selected to constitute alternative set. Comparison matrixes are constituted by pair-wise comparison according to Saaty1-9 scales. The relative weights between alternatives are determined by calculating the eigenvectors of comparison matrixes. Then fuzzy evaluation of every stage is carried out. According to maximum membership degree principle, the ergonomics evaluation grade is determined.
Research on the Color Calculation Method of LCD Based on the Spectral Radiation
Authors: Liu Hao Xue , Zheng Lan , Dai Li , Huang Min
Published: October 2011

The principle of color rendering of LCD is discussed. An experiment with EIZO CG 19 LCD and NEC PA 241 LCD was done to test the spectral additive property and the results show that the spectral additivity is held well. A new calculation method based on spectral additivity is proposed and discussed. The proposed method is simple and very few samples need to measure, and the computation precision is very high.
The Analysis of the Associated Legendre Functions with Non-Integral Degree
Authors: Wang Jian Qiang , Chen Hao Yuan , Chen Yin Fu
Published: October 2011

Spherical cap harmonic (SCH) theory has been widely used to format regional model of fields that can be expressed as the gradient of a scalar potential. The functions of this method consist of trigonometric functions and associated Legendre functions with integral-order but non-integral degree. Evidently, the constructing and computing of Legendre functions are the core content of the spherical cap functions. In this paper,the approximated calculation method of the normalized association Legendre functions with non-integral degree is introduced and an analysis of the entire order of associated non-Legendre function calculation is presented. Besides, we use the Muller method to search out for all intrinsic values. The results showed that the highest order of spherical harmonic function for constructing regional model of fields is limited, thus high-resolution spherical harmonic structure of local gravity field need to be improved.
Rotational Speed Control of Wind Power Generation Systems with Variable-Speed and Variable-Pitch
Authors: Xia Ja Kuan , Lu Shi Xuan , Mao Shuang , Huang Wei
Published: October 2011

A robust controller of wind turbine pitch angle is designed by using the quantitative feedback theory based on the analysis of wind power system model in this paper. The controller design methodology is to select the system parameters quantitatively at different wind speed disturbances in order to optimize the response time and the output stability. Theoretical analysis and simulation results demonstrate that the controller can control the speed stability of wind power system with strong robustness to uncertain disturbances of the system parameters when the wind speed fluctuates randomly.
Elimination of Scan Blindness in Rectangular Waveguide End-Slot Phased Arrays Using High-Impedance Surface
Authors: Zhu Wei , Lu Xv Fu , Gao Qiang
Published: October 2011

High-impedance ground plane (HIGP) is applied in the design of rectangular waveguide end-slot phased array. The benefits of using such a HIGP are related to the suppression of surface waves because of its obvious frequency bandgap and, therefore, the scan blindness could be eliminated. Both of the bandgap curve of the HIGP structure and the scan properties of the phased arrays have been calculated. The elimination of scan blindness is obtained.
Effect of Solid Solution under High Pressure on the Microstructures and Mechanical Properties of AM60B Alloy
Authors: Liu Qiu Xiang , Zhang Rui Jun , Zhang Miao
Published: October 2011

Effect of solid solution under high pressure on the microstructures and mechanical properties of AM60B alloy has been investigated. The results show that solid solution under high pressure leads to refined crystal grains of α-Mg phase in the alloys after aging treatment. When the solid solution pressure is about 4GPa, the smallest grain size can be obtained, which is only 8.4% of the grain size when the solid solution is carried out under ambient pressure. Moreover, hardness and compressive strength of AM60B after aging treatment both increase remarkably when the solid solution is performed under high pressure. The superior compressive strength and plasticity can be achieved at 5GPa.
Establishing Mathematics Model of Pole Gap Parameters in the High Frequency Short Pulse Electrochemical Machining
Authors: Cao Guo Qiang , Dai Yi Tong , Yao Lan
Published: October 2011

Recently, high frequency short pulse electrochemical machining is a focus engineering of national research, its mechanism of research must established in the foundation of correct mathematics model, capacitance model is a ideal model to analysis high frequency short pulse, this article is based on capacitance model, make a detailed formula deduction on the main factors for high frequency short pulse electrochemical machining, eventually, acquired high frequency narrow pulse electrolysis processing gap between poles formula which is based on capacitance model.
Double-Loop Push-Pull Forward DC/DC Converter Control System
Authors: Yue Gai Li , Li Rong , Chen Chao , Wei Xiao Long
Published: October 2011

With the continuous development of aviation technology, reliability requirements for air power is growing. As an important component, air static inverter air power has been studied extensively. In this paper, we study the following about the design of the front push-pull forward converter of Aeronautical Static Inverter: First, we design the Push-Pull Forward DC/DC converter control system on the basis of small-signal modeling; Secondly set control system parameters ; Finally, Through the simulation in MATLAB Simulink, we verify the design of the converter control parameter is reasonable, and then verify that Double-loop push-pull Forward DC/DC converter control system in the aviation static inverter is effectiveness.
Adaptive Control of Machining Process Based on Fuzzy Wavelet Neural Network and Generalized Entropy Square Error
Authors: Lai Xing Yu , Yan Chun Yan , Ye Bang Yan , Li Wei Guang
Published: October 2011

In order to improve the slow response and weak robustness of fuzzy control for machining process, combining qualitative knowledge expressiveness of fuzzy control with excellent local property of wavelet analysis and quantitative learning ability of neural network, a new kind of fuzzy wavelet neural network controller (FWNNC) is presented and a generalized entropy square error (GESE) function is also defined. The FWNNC is then applied to the on-line control of the cutting force under variable cutting conditions. Simulation results show that the proposed controller is superior to the fuzzy control or the neural network control for machining process and it has better static, dynamic performance. Experimental examples are also given to demonstrate the effectiveness of the proposed controller.
Numerical Simulation of 2D Flows with Hydraulic Jump Using Shallow Water Equations
Authors: Su B.L. , Wei W.L.
Published: October 2011

This paper is concerned with a mathematical model for numerical simulation of 2D flow accompanied with a hydraulic jump. The governing water equations are solved by the Mac Cormack’s predictor-corrector technique. The mathematical model is used to numerically predict 2D hydraulic jump in a rectangular open channel. The comparison and the analysis show that the proposed method is accurate, reliable and effective in simulation of hydraulic jump flows.
Effect of Different Photoperiodic on Flowering in Dendranthema lavandulifolium
Authors: Ma Yue Ping , Dai Si Lan
Published: October 2011

After 50 days long-day maintenance ofD. lavandulifolium, seedlings with 6 leaves had different flower bud under different photoperiodic induction during 30 days treatment. The result showed that maximum flower bud (70%) was observed in 12hr light/ 12hr dark and 13hr light/11hr dark after 30 days induction. 11h light/13h dark also showed good flower bud (60%). 30% flowering were observed on 9hr light. None flower bud was observed in control plant. The earliest bud appeared only need 10 days after short-day induction.
Quantization of Mesoscopic Quartz Piezoelectric Crystal Equivalent Circuit
Authors: Yan Zhan Yuan , Zhao Pan , Xu Shi Liang
Published: October 2011

By using the advanced quantum theory of mesoscopic circuits, a mesoscopic quartz piezoelectric crystal equivalent circuit is quantized. The energy spectrum and wave functions of the system are obtained with perturbative method and the current quantum fluctuation are calculated as an application. The detail characters of energy spectrum and wave functions in the system would be helpful to the design of integrate circuit.
High-Performance Readout Circuit for Monolithic Integrated Pressure Sensor
Authors: Zhou Xu Hua , Xu Shi Liu , Zhang Zheng Yuan
Published: October 2011

A readout circuit with high sensitivity and high linearity is proposed in this paper. The applied pressure is sensed by Wheatstone bridge which can reduce the adverse effect of temperature. As the applied pressure changes from 15kPa to 115kPa, the sensitivity of the bridge is 0.36mV/kPa. The current source of the circuit can provide a current with a positive coefficient which can compensate for the inherent high-temperature loss of sensitivity of the Piezoresistive Bridge. Three high-precision operational amplifiers with symmetrical input and rail-to-rail output are used to process the output signal of the bridge. It can provide high CMRR with 123.8dB, open loop gain is 110dB and the output swings from 36.41mV to 4.953mV as the power supply is 5V. A thin film resistors network can compensate for the zero pressure offset and sensitivity by trimming. The high sensitivity of the bridge and the high linearity of the proposed circuit make the readout circuit suitable for monolithically integrated pressure sensor.
A Long Sequence Length, Reduced Complexity MASH 1-1-1 DDSM for Fractional-N Frequency Synthesizer
Authors: Li Bin , Fan Xiang Ning , Zhu Wei Wei
Published: October 2011

In this paper, a long sequence length, reduced complexity MASH 1-1-1 digital delta-sigma modulator (DDSM) suitable for fractional-N frequency synthesizer applications is presented. Good shaping of quantization noise is achieved by using the state of art MASH structure for a digital third-order delta-sigma modulator, meanwhile, the hardware required for this modulator is considerably reduced by recoding all carry output signal from accumulators. The functional operation of the modulator is confirmed by simulation.
Mathematical Modeling: A Brilliant Future of Electric Vehicles
Authors: Lin Meng Meng , Yu Sheng Tao , Ying Yu Lin
Published: October 2011

This paper analyses the factors that influence the development of electric vehicles, from the aspects of energy, power grid capacity, environment and the society as a whole. A mathematical model of AHP (Analytic Hierarchy Process) is established to study the factors that influence the development of electric vehicles. The model reveals that the feasibility value of system reaches 0.7332, which indicates the feasibility of promotion for widespread use of electric vehicles in China.
Texture Segmentation Using Active Contours Driven by Local Steerable Features
Authors: Lee Dan , Wang Huai Bin
Published: October 2011

Oriented filters are useful in many computer vision and image processing tasks. It is a kind of oriented filters, rotated very efficiently by taking a suitable linear combination of basis filters. Local steerable feature (LSF), which captures local structure corresponding to any orientation, is distinctive enough to provide useful identity orientation information. This paper investigates novel LSF-guided active contour approach for texture segmentation. The steerable filters are first employed to produce a new energy image, then, the active contour proposed by Chan-Vese (ACWE) is applied to the energy image. These active contours combine the advantages of both the LSF texture representation and the ACWE model, and yield high quality texture segmentation. The performance of the algorithm on some test images is presented and analyzed.
Dynamics Analysis of Double-Tamper Mechanism for Asphalt Paver
Authors: Sun Jian , Xu Gui Yun
Published: October 2011

Owing to the tamping mechanism of paving machines, the shocks towards flatiron-box are produced by compound motion of tamping beam. This significantly influences the road paving quality. In this paper, the dynamics model of double-tamper mechanism is established and the vibration process is simulated by the numerical analysis software—Matlab. Through the analysis of double-tamper mechanism, we can get the impact regularity of the vibrating beam inertia force and moment of inertia as a result of the vibration frequency and amplitude. It provides a reference for the design of double-tamper mechanism for asphalt paver and the adjustment of construction parameters.
Simulation and Analysis of Special Motor of the Hydraulic Motor-Vane Pump Based on Ansoft
Authors: Qi Qi , Ji Hong
Published: October 2011

The simulation models of the hydraulic motor-vane pump and three-phase asynchronous motor are established based on Maxwell 2D of ANSOFT, with which the basic performance and transient characteristic are analyzed and the influence law of the hydraulic oil on the transient starting performance of special motor is obtained. The simulation results can be used to design the special motor.
Dynamic Model of Gears with Trapped Oil and Coupled Analysis in External Spur-Gear Pump
Authors: Li Yu Long , Liu Kun , Sun Fu Chun
Published: October 2011

In order to understand the vibration characteristics of gears based on trapped-oil in external spur-gear pump, from the calculations of trapped-oil pressure and hydraulic load and contact stiffness and trapped-oil stiffness, etc., a dynamic model coupled with trapped-oil pressure was derived for the gears, then an iterative operation based on Runge-Kutta method was used for analyzing the model, therefore the data related to trapped-oil pressure and the vibration displacement and the vibration velocity were obtained in a periodic of trapped oil, and the impact of different backlash value and different distance between two unloading grooves on trapped oil pressure and dynamic characteristics of gears was briefly analyzed. All results of simulation showed that trapped-oil pressure and trapped-oil stiffness had greater impact on vibration characteristics of gears in external spur-gear pump, trapped-oil stiffness could reduce the vibration of the gears; in simulation of trapped-oil pressure, dynamic trapped-oil model related to dynamic characteristics of gears more accurate than the static trapped-oil model irrelated to dynamic characteristics of gears; the trapped-oil pressures in two trapped-oil cavity were different, the vibration characteristics of gears was better that in larger backlash value, etc.. Finally, by the trapped-oil stiffness of the external gear pump is unique, the important conclusions are educed that the vibration of gears in external spur-gear pump is indeed different from conventional gears and so on.
Excavator Operator Mechanism and Hydraulic Integration Model Construction and Simulation Based on Modelica
Authors: Gong You Ping , Bian Xiang Juan , Chen Guo Jin
Published: October 2011

This paper explains and demonstrates how to construct integration simulation model of exavtor operator based on modelica language. The paper firstly introduce the history of modelic language and application in production design; secondly the paper construct exavtor operator dynamics model by D-H method and construct operator’s modelica model by dymola soft; then the paper analyse the hydraulic system of operator, and construct hydraulic simulation model which integrate to operator mechanism system; at last the paper gives simulation results of vauious operating mode. Because of consideration in coordination of mechanism and hydraulic of operator,the simulation results approach actual working process,and improve the exavtor’s design efficiency and reliability.
Preparation of Sands Modified by Aluminous Salt and its Adsorption Capability of CD2+
Authors: Ding Chun Sheng , Fu Yang Ping , Zhu Qian Fen , Fu Jing
Published: October 2011

In this experiment quartz sand was chosen as a carrier to be coated by aluminous salt under alkaline condition, and then the specific surface area was tested, and the adsorption capability and Cd2+ removal influencing factors of modified sand were studied. The investigation results showed that the specific surface area of modified sand was 75.244m2/g which was 9.38 times of that of original sand; the removal efficiency of Cd2+ by aluminous salt modified sand reached 59% contrast to 39% of original sand with pH 7.00. It was also found that the removal efficiency of Cd2+ by the aluminous salt modified sand was reduced with the increase of initial concentration of Cd2+ solution, and was enhanced with the increase of pH value, the Cd2+ removal efficiency was almost 71% with pH 9.0.
Effects of Atmospheric Turbulence on High Resolution SAR Performance
Authors: Bi Yue Kai , Sun Jin Ping , Han Xiao , Wang Yan Ping
Published: October 2011

The phase errors of radar signals can be caused by random tropospheric refractivity fluctuations in a turbulent region, which affects the imaging performance of high resolution airborne SAR. A detailed simulation approach is presented to estimate the phase errors caused by atmospheric turbulence. Applying the von Karman spectrum as the model for turbulent refractivity fluctuations and the raw data collected by a Ku-band airborne spotlight-mode SAR with 0.1m resolution, we simulate the results of effects of atmospheric turbulence on SAR image focusing.
Effect of Substrate Temperature on the Preparation of Cu2ZnSnSe4  Thin Films
Authors: Han Lei , Chen Zhe Sheng , Wan Lei , Xu Jin Zhang
Published: October 2011

The Cu2ZnSnSe4 (CZTSe) thin films were prepared by co-electroplating Cu-Zn-Sn precursors followed by selenization at different substrate temperatures. The effect of substrate temperatures on the morphologies and structures of CZTSe films were characterized using scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), X-ray diffraction (XRD) and Raman scattering spectrum respectively. The results revealed that the impurity phases in CZTSe thin films such as CuSe and SnSe disappeared when the substrate temperatures were increased. The surface morphologies of CZTSe thin films were also strongly dependent on the substrate temperature treatment in the selenization process though the selenium temperature was kept at 340°C.
Study Analysis on Purification of Alumina Electrolytic Flue Gas by Bag Filter
Authors: Wang Jia Qiong , Kong Fan Yu
Published: October 2011

To improve the shortcoming in bag filter design in China (mainly used in purification of HF in alumina electrolytic flue gas), necessity of basic theoretical study on bag-filter used in purification of alumina electrolytic flue gas is analyzed. Four study aspects are proposed , which includs flow field optimization, influences of bag length and process parameter on forming dust layer, properties of the dust layer adsorbing hydrogen. Some primary study is done. This will provide a reference for engineering design and process operation.
The Critical Success Factors and Orientation Enhancing of High-Tech Enterprises Consultation
Authors: Liang Ge Fu , Pang Da Lian , Cui Xiao Na
Published: October 2011

Critical Success Factors can be changed with the difference of industry, environment, business strategy, lifecycle of system, identification method and system, categorization and the study perspective of researchers. In the research of new high-tech enterprises consultation, it’s more valuable to discuss the Critical Success Factors and the orientation enhancing effect under the background of the lifecycle, value system and the classification of SWOT. Consulting the new high-tech enterprises under the background of “LC+CSF” will generate three kinds of prospective oriented aggrandizement, which are foreseeing enhancement of crucial problems, enhancement along the lifecycle track and foreseeing enhancement of the whole lifecycle. At the same time, consulting under the background of “VE+CSF” will generate four kinds of value orientation enhancement, which are type of function increasing relatively, type of cost reducing relatively, type of value upgrading and type of increasing methods applicability. Meanwhile, consulting in the situation of “SWOT+CSF” will make consulting judgment and consultation scheme be strengthened effectively along strategy and environmental orientation because of the application in the strategic quadrangle analysis affected by SWOT classification factors and CSF, factor intensity analysis and strategic situation analysis.
A Rapid Method for Image Compression Based on Wavelet Transform and SOFM Neural Network
Authors: Xu Hong Ke , Yang Wei Song , Fang Jian Wu , Wen Chang Bao , Sun Wei
Published: October 2011

The current self-organizing feature map (SOFM) neural network algorithm used for image compression, of which a large amount of network training time and the blocking effect in the reconstructed image existed in codebook design vector calculation. Based on the above issue, this paper proposed an improved SOFM. The new SOFM introduced normalized distance between the sum of input vectors and the sum of the codeword vectors as a constraint in the process of searching for the winning neuron, which can remove redundant Euclidean distance calculation in the competitive process. Furthermore, this paper has done image compression by combining wavelet transform with the improved SOFM (WT & improved SOFM). The method firstly conducted wavelet decomposition for the image, retained low-frequency sub-band, then put the high-frequency sub-band into improved SOFM network, and achieved the purpose of compression. Experimental results showed that this algorithm can greatly reduce the network training time and enhance the learning efficiency of neural network, while effectively improve the PSNR (increased 0.6dB) of reconstructed.
An Identification Management Framework for IT-Enabled Services and E-Government: A Consideration of the Case of Japan
Authors: Uesugi Shiro , Ueda Masashi , Ujikane Yoshikazu
Published: October 2011

Managing identity is an issue that has been dealt with in various contexts. This paper explores the problem in identity management from the perspective of IT-enabled Services, with special emphasis on the Japanese context. It is an illustration of problems involved in the introduction of a unified national digital identification system in Japan. This paper also presents a framework, which serves to enhance ITeS characteristics of digital identification system in Japan. Results from a survey about trust are also included.
Carbon Dioxide Gas Sensor Using SAW Device Based on ZnO Film
Authors: Wen Chang Bao , Ju Yong Feng , Li Wan Lin , Sun Wen Zheng , Xu Xin , Shao Yan , Li Yan Ming , Wen Li Min
Published: October 2011

Carbon dioxide (CO2) gas sensor using surface acoustic wave (SAW) device based on Zinc oxide (ZnO) was developed and fabricated in this paper. The center frequency of SAW device is 203.528 MHz. The input and two output interdigital transducers (IDT) apodized by Morlet wavelet function can improve the side lobe rejection compared with uniform IDT. The ZnO film sensitive to CO2 gas was fabricated in measurement acoustic track of SAW device. Experiments results confirm that the CO2 gas sensor using SAW device based on ZnO film has good response characteristics to different concentrations CO2 gas. Furthermore, the CO2 gas sensor using SAW device based on ZnO film has good stability and linearity.
Development and Application of Asphalt Pavement Construction Quality Control System
Authors: Jing Tao , Yan Hai Feng , Ji She Peng
Published: October 2011

As an important part of the asphalt pavement construction, quality control is directly related to the life of road. In view of the non-uniformity issues in asphalt mixture production and construction processes, depending on the segregation standards in asphalt pavement testing, the universal volumetric chart is used to control the asphalt mixture’s volume indexes in this paper. And a PQI (pavement quality indicator) is used to make a non-destructive inspection of the pavement density. Finally, the controlling and monitoring system from asphalt mixture production to asphalt pavement construction and applying software with asphalt pavement construction quality control and quality assurance in the platform of MATLAB are developed in this paper. According to the field application, the system and software developed in this paper could be well used in the asphalt pavement construction quality control.
Direct Torque Control System for Belt Conveyor Based on Improved Genetic Algorithms
Authors: Yang Zhan She
Published: October 2011

The belt conveyor is the main transport equipments in coal field, and its controllable drive system directly impacts on the running safety reliability and cost in coal production. Starting speed is unsmoothed in the traditional electrical drive system, which causes the belt off tracking or split and even safety accident. Therefore it is theory and practical significant to introduce a novel direct torque control (DTC) system of AC machine to the belt conveyor for solving the problem in coal mine. In allusion to the optimization of PID parameters in the speed regulators of the belt conveyor, the paper presents the improved genetic algorithm based on genetic algorithms and taboo search for the design of variable parameters of PID controller, and its ability of stronger climbing and faster finding the global optimum results are verified through the De Jong function. Compared with the traditional means, the rise time of the suggested system is faster, overshoot and regulating time is shorter, anti-disturbance is stronger, robust is better. So the optimization performance of control system is improved greatly.
Dynamic Optimization for Multi-Phase Intersection Timing Using Stratified Genetic Algorithm
Authors: Xu Hong Ke , Fang Jian Wu , Yang Wei Song , Gao Shang , Yan Mao De
Published: October 2011

Based on the study on traffic flow characteristics of the intersection, and current signal timing model of intersection, this paper selected the stop delay, the number of stops and parking traffic capacity as the indexes, and translated them into a single nonlinear objective function which is the fitness of genetic algorithm. In order to meet the changes of intersection traffic flow, this paper improved the basic genetic algorithm. The improved algorithm with two genetic layers carried on signal timing optimization for middle traffic flow and peak traffic flow situation. Experiments show that the model is reasonable, and the effect caused by timing parameters optimization is obvious.