bluuebunny/crossref_metadata_2025 huggingface dataset:
Design and Implementation of Remote Destruction SSD
Authors: Li Qing Jiang , Liu Hai Jun , Sun Zhao Lin , Nie Hong Shan , Xu Xin
Published: September 2012

An implementation of a remote destruction solid state drive (SSD) was introduced in the design. The advanced technology of rapid data destruction, the technology of breakdown the flash with high-voltage pulse and the technology of GSM is combined together. As a result, user can operate through a simple command (text message or a call) to destroy all data in SSD, as long as the user confirms SSD is out of control. The method of erasing data and destroying the flash I/O are both executed, so the data can’t be recovered after destruction. At last, some tests are displayed to verify the performance of the remote destruction SSD.
Research on Software Optimization Solutions of E-Commerce Site
Authors: Wang Xin
Published: September 2012

There are generally two types of E-commerce platform optimized programs: hardware optimization and software optimization, This paper first analyzes the system optimization techniques of software optimization, Including dynamic load optimization technology and cluster technology; Then studies the database performance optimization methods from the table, connection pooling, query and several other aspects; Finally to carry on the research to optimization electronic commerce platform used the cache technology. Proposes a universal significance of E-commerce platform software optimization solutions, these studies have some references for relevant E-commerce website designers and maintainers, and provides a strategy for the corresponding E-commerce enterprises to optimize platform environments.
Analysis and Design of Energy-Saving Information Management System Based on .NET
Authors: Wang Shou Jin , Song Xiao Yu , Liu Ji Fei , Wang Yong Hui
Published: September 2012

In order to achieve the national energy saving targets, and track, supervise, manage and assess the energy-using condition of the key energy-using enterprise effectively, according to the user’s demand and the system feature, the Microsoft.Net framework and the MVC mode are chosen, and combined with the Ajax technology, the implemented plan is settled. The .net-based energy-saving information management system is designed and implemented, and it improves the condition of the information reporting and statistical analysis mean for key energy-using enterprise and relevant functional departments. The result shows that the system architecture is reasonable, and it improves the maintainability and extendibility of the system.
Modular Design of Flash-Based Educational Software
Authors: Miao Liang , Zhang Er Feng , Sui Chun Rong
Published: September 2012

In order to resolve the problems of inefficiency and difficulty in educational software development, a new idea of modular method based on Flash technology is proposed in this paper. Under the guidance of advanced education, educational software constitutes are decomposed, the different module types are analyzed, learning modules are built by using Flash layer, different learning modules are integrated through a control module. It is indicated through practice that our method can greatly improve the efficiency of educational software development.
The Implementation of a RAM Disk
Authors: Diao Jie Tao , Guo Jing , Yu Hong Qi , Sun Zhao Lin , Liu Hai Jun , Nie Hong Shan
Published: September 2012

RAM disk uses the memory of a computer to construct a high speed, high reliable storage space. Though it is useful, there is little information on the development of RAM disk, especially on Microsoft Windows platform. On Windows platform, RAM disk has to be realized though writing Windows drivers. Implement drivers for Windows is a challenging task that only a small group of programmer can handle for many years. Now, with the new Windows Driver Foundation (WDF), this task is much easier. In this paper, Microsoft’s skeleton RAM disk driver in Windows Driver Kit (WDK) was analyzed and modified. At last, a full function, resizable RAM disk driver was got.
Instrument Driver for Signal-Oreinted ATS
Authors: Wang Feng Qin , Wang Chang Jin , Guo Tian Jie , Liu Yu
Published: September 2012

The virtual instrument technology and auto test system software architecture for the Signal-Oriented test are first introduced, and then the requirement of virtual instrument driver module is analyzed. Finally, the design scheme of virtual instrument driver module based on Component Object Model component technology is given. Using the scheme, we developed 22 kinds of the test instruments driver. Experiment results show that the scheme improved the driver scalability, maintainability and reusability greatly.
Noise Level Prediction by Combination Sound Signal
Authors: Zhong Qi Ming
Published: September 2012

In the paper, a new method for accuracy noise monitoring method is presented in detail. Noise level estimation and together two vibration signals have been used to predict the noise level. The results show that the sound signal method can effectively improve the accuracy of noise monitoring, which can be very useful for further research and noise control. This method is very convenient in the testing workshop.
Study on Neural Networks in Parallel Computing Environments
Authors: Hu Yu
Published: September 2012

Neurons are highly interconnected with each other and are communicating via sending and receiving electrochemical signals, thus composing sophisticated network of interconnected and communicating neurons. This paper discuss the structure of the neural network function approximator and the time series forecasting with neural network, the results could help us to obtain the optimal solutions to higher complexity of the problem.
Research of Compensating Weights of Cascade Hydropower Stations
Authors: Wang Gan Yi , Wu Xiang Lin , Song Hong Sheng
Published: September 2012

The compensation benefits distribution weights model of cascade hydropower stations has been proposed. The method of compensation weights calculation has been discussed. The subjective weights in the station indexes are calculated by analytic hierarchy process and the objective weights by variance coefficient and the combination weights by Topsis. The calculation results will be evaluated. The increased benefits of the system will be distributed by the objective weights. The enthusiasm for electric energy production of each station will be increased because they can receive compensations from the whole increased benefits.
The Deduction of Similarity Relationships in Tunnel Model Test
Authors: Zheng Sheng Bao , Jiang Shu Ping , Wang Xiao Wen
Published: September 2012

Similarity relation has been studied on the basis of similarity theory in . Galongla tunnel shaking table model test The model test similarity criterion is deduced by equation analysis and dimensional analysis. The geometric conditions, boundary conditions, loads and materials are correctly simulated in the table test. Comparison has been finished from the curve of acceleration-time, spectrum feature, coefficient of acceleration and failure. The results from the tests coincide highly with theory values. The phenomena of failure and location also agree well. It shows that it is reasonable for the simulation relation.
Research of Application of Bounded Rationality on Virtual Soldier Modeling
Authors: Xue Qing , Cao Bo Wei , Li Ai Lan , Yu Ping Gang , Yao Yi Jun
Published: September 2012

Rational theory of finite virtual soldiers on the concept of bounded rationality, bounded rationality theory analysis of the added features of the virtual soldiers, given the limited rationality based on the overall framework of the virtual soldiers, using the model framework to make the virtual real soldiers, soldiers with similar perception, decision making and exercise capacity, for the subsequent implementation of the modules laid the foundation framework.
Evaluation of University Logistic Guarantee Based on Grey Theory
Authors: Zhang Jian , Li Qin Zhen , Yin Kai , He Song Bai , Yin Gang
Published: September 2012

An index system for the assessment of university logistic guarantee is built. By the combination of analytic method, based on hiberarchy and gray theory as well as all sorts of the facts of university logistic guarantee in battle, a model of assessment of university logistic guarantee is established. By the test, the model is valid.
Atrium-Corridor Structure Fire Smoke Simulation
Authors: Liu Wen Si , Zhong Chen Hua , Yang Zhi Qing , Wang Li Wei
Published: September 2012

This article aims to simulate fire smoke spread in atrium-corridor structure with different factors, reveal the relation between spread time and each single factor, which may provide guidance for further fire design in the atrium-corridor structure.
Research on the Evacuation Complexity Model in Mass Emergency Evacuation
Authors: Liu Yi , Huang Quan Yi , Zhu Hai Guo , Yuan Hong Yong , Zhang Hui
Published: September 2012

Based on the analysis of the mixed traffic evacuation in china, this paper presents the behavior characteristics and inherent laws of the mixed traffic evacuation, designs the quantification model of evacuation behaviors and utility index of mixed traffic evacuation. By improving the Critical Cluster Model (CCM), three types of sub-emergency planning zones (sub-EPZ) were presented, and the quantification expression and visualization of mixed traffic Emergency Evacuation were realized based on GIS. Through the analysis of emergency evacuation intent, this paper expands the theory of critical cluster model to solve the theoretical and technical problems, which provides a support for the scientific and reasonable emergency evacuation decision-making. This case study demonstrates the feasibility and effectiveness of the improved model from this study.
Stability Properties of Pulse Vaccination Strategy in the SIVS Epidemic Models with Nonlinear Incidence Rate
Authors: Song Yan
Published: September 2012

In this paper, we discuss the SIVS epidemic models with vertical transmission and nonlinear incidence rate. We study the stability properties of pulse vaccination strategy in the models and obtain the sufficient condition for which the epidemic elimination solution is globally asymptotically stable.
Security Workflow with Schematic Protection Model
Authors: Wang Guo Qian
Published: September 2012

Application of Schematic Protection Model (SPM) on workflow access control is studied. Fine grained access control properties of SPM made it feasible to express workflow security policies. SPM link predicate semantics is extended in the workflow context. Link predicate between workflow activities is applied to constrain the take grant enforcement. License access control in the workflow is also modeled by SPM Inner control ticket.
Time-Dependent Ginzburg-Landau Equation in Car Following Model Considering the Traffic Interruption Probability
Authors: Zhang Yi Qiang , Cheng Rong Jun , Ge Hong Xia
Published: September 2012

This paper focuses on a car-following model which involves the effects of traffic interruption probability. The stability condition of the model is obtained through the linear stability analysis. The time-dependent Ginzburg-Landau (TDGL) equation is derived by the reductive perturbation method. In addition, the coexisting curve and the spinodal line are obtained by the first and second derivatives of the thermodynamic potential. The analytical results show that the traffic interruption probability indeed has an influence on driving behaviour.
Modeling and Dynamic Analysis of the Xijiang FPSO Mooring System
Authors: Yang Jia Xuan , Shi Guo You , Huang Yao Liang
Published: September 2012

This paper uses the information on the Xijiang floating production storage and offloading mooring system coupled with dynamic analysis of the system to generate scenarios for the most likely causes of the damage to the wires and if this is likely to result in further progressive damage of the mooring system. The modeling reflects the fundamentals of the Xijiang FPSO mooring system and can be used to further investigate potential causes for the mooring leg damage. The mooring dynamic analysis has been used to investigate the indicative behavior of the mooring lines under various conditions when BTM connected. The model has been used to investigate the tensions, bending moments and bending radiuses close to the lower socket. However the models have been checked to determine that they produce results which are of the correct order for the mooring system.
Contagion Effect Analysis of Financial Crisis in Soybean Futures Markets Based on Copula Functions
Authors: Chen Jian Bao , Yang Ting , Zhou Huo Biao
Published: September 2012

Using five kinds of Copula functions to investigate the changes of correlations among soybean futures in Tokyo Grain Exchange, Chicago Board of Trade and Dalian Commodity Exchange market before and after the financial crisis caused by American subprime mortgage, this paper verifies the existence of contagion effect of this crisis in the international soybean futures markets.
Model Checking Multirate Hybrid Systems with Dense Timed Interval Temporal Logic
Authors: Zhang Hai Bin , Yang Li Ya
Published: September 2012

This paper investigates the model checking issue of multirate hybrid systems. To this end, multirate automata are used to represent the possible behavior of multirate hybrid systems, and a dense timed interval temporal logic (DTITL) is defined to describe the desirable property. To check whether a multirate automaton satisfies a DTITL formula, a corresponding region automaton and a propositional interval temporal logic (PITL) formula are constructed. After each vertex of the region automaton being labeled with propositions appearing in the corresponding PITL formula, the model checking problem for mutirate hybrid systems is reduced to the same issue for PITL, which can be solved readily.
A Control Method for Car Following Model Considering Changing Behaviors
Authors: Meng Xiang Pei , Cheng Rong Jun , Ge Hong Xia
Published: September 2012

We propose a simple control method to suppress two-lane traffic congestion for full velocity difference (for short, FVD) car-following model. The influence of lane changing behaviors is also studied in the stability of two-lane traffic flow under the boundary condition, and the friction interference which is from the neighbor lane has been taken into account. We derive the stability conditions by the control method. The feedback signals, which include vehicular information from both lanes, acting on the two-lane traffic system have been extended to the FVD car-following model. Theoretically, lane changing behaviors can break the stability of two-lane traffic flow and aggravate traffic perturbation, but it is proven that the congested traffic in two-lane traffic flow could be suppressed by using this control method.
Tactics System of Air-Raid Target-Stream Based on Air-Confront-Ground
Authors: Zhang Bo , Liu Fu Xian , Zhao Rui Qi , Chen Yong Ge
Published: September 2012

This paper ascertains the battleplane’s tactics applied in Air-Confront-Ground simulation, constructs the battleplane Agent’s tactics system, and illuminates the main module of the system. Then taking the Attack-elevate tactic for example, the math model of the tactic is founded primarily, and the process of tactics’ choice and evaluation is analyzed, at last the executing algorithm of Attack-elevate tactic is generated.
Virtual Instrument Measurement System Architecture Design Based on Database Management
Authors: Zhang Ke Jun , Xu Wu
Published: September 2012

The purpose of virtual instrument measurement system architecture design based on database management is to expand stand-alone mode into the measurement mode of network. Through computer network, multiple virtual instrument measurement networks for data storage, communication and control the formation of network measurement applications are realized. This article discusses the formation of virtual instrument based on the database and computer network monitoring and control network programs, measures and achievement.
Magnesium Nitrate as Additive for Synthesis of Mg(OH)2 Nanoparticles
Authors: Kong Qing Gang , Qian Hai Yan
Published: September 2012

Magnesium nitrate was used as additive for synthesis of Mg(OH)2(MH) nanoparticles at low temperature (70°C). Mg(OH)2nanoparticles have platelet-like structure and approximately 40-60nm in thicknesses. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were applied to characterize the crystal phase. The supersaturation degree of solution effects the size and morphology of MH nanoparticles.
Stability Margin Clearance of Missile Autopilot Using μ Anylysis
Authors: Hou Zhen Qian , Liang Xiao Geng , Wang Wen Zheng , Wang Qiang Feng
Published: September 2012

A new method of stability margin clearance of missile autopilot is described. First, a model of linear fractional transformation form is established for missile has uncertain parameters; then, the system stability margin requirements are seen as a virtual uncertainty and introduced into the model; Finally, the model is analyzed, and the clearance results about the missile autopilot performance is obtained. The results show this is a more efficient and accurate clearance method than traditional ones.
Interval XFEM and its Application to Fracture Mechanics Problems
Authors: Yu Tian Tang , Shi Lu Yang
Published: September 2012

This paper presents the results of a combination of interval perturbation method and the XFEM (IXFEM) to analyze Linear Elastic Fracture Mechanics problem. Uncertain parameters were expressed as interval variables and sub-intervals perturbation for the elements employed in the analysis. The IXFEM method proved very robust in handling parameters uncertainties in fracture problems.
Predictive Control and Simulation for Variable-Pitch Wind Turbines
Authors: Wang S.X. , Li Z.X. , Sun D.X. , Xie X.X.
Published: September 2012

In order to avoid the limitations of traditional mechanism modeling method, a neural network (NN) model of variable - pitch wind turbine is built by the NN modeling method based on field data. Then considering that from wind turbine’s startup to grid integration, the generator speed must be controlled to rise to the synchronous speed smoothly and precisely, a neural network model predictive control (NNMPC) strategy based on the small-world optimization algorithm (SWOA) is proposed. Simulation results show that the strategy can forecast the change of generator rotational speed based on the wind speed disturbance, making the controller act ahead to eliminate the impact of system delay. Furthermore, the system output can track the reference trajectory well, making sure that the system can connect the electricity grid steadily.
Study of Fuel Injection Quantity Fluctuation in High Pressure Common Rail System in Entire Operating Conditions
Authors: Tian Bing Qi , Fan Li Yun , Ma Xiu Zhen , Wang Hao , Liu Hong Bin
Published: September 2012

Variations in high pressure common rail (HPCR) system characteristic parameters influence injection characteristics and lead to fluctuation of fuel injection quantity (FIQ). The fuel injection quantity fluctuation (FIQF) has adverse affects both on coherence and stability of HPCR system. Numerical simulation model of HPCR has been developed and its accuracy has been validated by experimental results. Influence law and generation mechanism of FIQF caused by variations of different parameters such as fuel return pressure, solenoid reset force, control valve lift, fuel return orifice (A orifice) diameter, fuel inlet orifice (Z orifice) diameter, injector needle lift, needle pre-tightening force and injector flow coefficient in entire operating conditions have been analyzed.
Study on Forming Mechanism of Lamination Defect of AH36 Shipbuilding Plate Steel
Authors: Feng Rui , Zhang Rui Tang , Li Sheng Li , Kong Guan Hong , Zhu Xin De
Published: September 2012

The lamination defect makes the mechanical properties deterioration along the thickness of steel plate and therefore finding out the forming mechanism is of great significance for production of shipbuilding plate steel. The tensile fracture and microstructure characteristics on AH36 shipbuilding plate steel of lamination defect were studied with Scanning Electron Microscope (SEM), Transmission Electron Microscopy (TEM), etc. The results show that the strength-toughness properties vary widely at different thickness of the steel plate due to different ferrite grain size, and the center zone firstly yields and steps into plastic deformation stage due to coarse ferrite grain subjected to tensile stress, while the surface zone is still in elastic deformation stage due to relatively fine ferrite grain. The inconsistency of deformation and fracture leads to fracture separation, namely lamination. The continuous banded Widmanstätten structure, strip-shaped sulphide inclusions and mixed ferrite grain distributed at the center of shipbuilding plate steel create conditions for the lamination defect, which are important reasons for fracture separation. Widmanstätten structure at the center of steel plate has relationship with coarse austenite grain, and strip-shaped sulphide inclusions have relationship with centerline segregation of continuous casting slab during solidification process.
Study on the Applicable Wind Speed Model of Wind Farm and High-Frequency Wind Simulation
Authors: Ai Chao , Kong Xiang Dong , Wang Jing
Published: September 2012

In order to study how to deal with the load changes of the wind turbine transmission system that high-frequency wind caused, this paper used the mathematic model of combined type wind speed. This model simulated the actual wind speed precisely using the speed data obtained from Dalateqi wind farm. In this paper, several wind speed and direction which referred in the Wind turbine generator system-Design requirements were analyzed. We drew the velocity curve of different time which used the combined simulation model according to the referred model. Error analysis proved that the combined model simulated the actual wind speed with high precision. The high-frequency wind model simulation had practical significance on the engineering application.
Application of Heat Pump Technology in Coal Mine
Authors: Liu Jia You
Published: September 2012

Heat pump is widely used in many fields, and it has advantages of energy-saving, environment-friendly and good economy, etc. Coal mine drainage, cooling water from cooling tower of power plant and exhaust air in coal mine have stable temperature throughout the year, and they are good heat (cold) source for heat pump. By analyzing technical and economic performance of heat pump, several ways and purposes of heat pump used in coal mine are proposed, and the technical processes are given. Application of heat pump to recycle energy from coal mine drainage, cooling water and exhaust air is beneficial to improving economic efficiency and achieving sustainable development for coal mine.
Research Advances of NOx Emissions Control Technologies of Stoker Boilers
Authors: Liu Jia You , Sun Feng Zhong
Published: September 2012

Nitrogen oxides (NOx) are one of the pollutants generating from coal combustion in stoker boilers, and they are very harmful to human health and environment. It is necessary to study NOx emissions control technology for stoker boilers. By explaining the formation mechanism and control methods of thermal NOx, fuel NOx and prompt NOx, NOx emissions control technologies applied in stoker boilers are introduced and research advances are given, some advice for NOx emissions control in stoker boilers is put forward.
A Probability Density Estimation for Fault Detection
Authors: Zhuang Zhe Min , Li Fen Lan , Wei Chu Liang
Published: September 2012

In this paper, a time-domain analysis method based on probability density estimation is presented for rotating machine fault detection. Generally, the vibration signals obtained from a rotating machine are time-variant since they are strongly related to the rotational speed that is not constant even in the macro steady state. Since the mostly used signal processing method, the Fourier analysis is only suitable for stationary signals, the development of the joint time-frequency analysis is demanded. Here, the probability density estimation method based on Parzen window is introduced. The probability density function of the vibration signal of the rotating machine is estimated by Parzen window, and a threshold value is predefined to decide the state of the rotating machine. By inspecting the change of the probability density of the vibration signal, the condition of the machine is monitored. Air gap eccentricity and ball cage broken bearing are considered in the experiment section, they are difficult to be detected in frequency domain while the rotating speed is not constant. The validity of the method is proved by the experiment.
The Experiment on the Features of Ultrasonic Vibration Stimulating the Absorption and Desorption of Methane in Coal
Authors: Jiang Yong Dong , Yang Xing Yang , Zhang Hai Long , Zheng Quan , Liu Hao , Song Xiao
Published: September 2012

Through adopting the self-explored experimental system of ultrasonic vibration, this experiment studied the adsorption and desorption characteristics of methane in coal under the sound field varying in frequency and sound intensity. Results of the research showed that the methane absorption in coal reduces when being placed in the sound field, and the amount of absorption reduces as the sound intensity increases. The amount of methane desorbed in coal increases under the working of sound field, which indicates that the effect of sound field can promote methane desorption and diffusion. the adsorption 、desorption law of methane in coal are the same under the condition of sound field and no sound field, The absorption model can be described by the Eequation D-R、Langmuir Equation、Freundlich Equation and Equation BET. Plus, the Equation D-R、Langmuir Equation can better describe the law of methane absorption in coal. Desorption model can be expressed by empirical formula、diffusion model and percolation model, and the diffusion model can better describe the desorbing characteristics of methane. These results can provide theoretical principles to improve the rate of coal seam extraction under ultrasonic vibration.
Differential Equation and Analytic Computation of Throttle Slice Deformation under Micro-Circle Pressure
Authors: Zhou Chang Cheng , Zhao Lei Lei , Li Hong Yan
Published: September 2012

It has been a key problem that the analytical computation of a throttle slice deformation, for the design of shock absorber valves parameters. In this paper, the mechanics model of throttle slice under a spring pre-tightening was simplified into that under a micro-circle pressure. Using boundary and continuity constraints, the general equation for throttle-slice deformation under a micro-circle pressure was given, and by mathematical transformation, an analytical formula was established. With the practical example, the deformation of throttle slices on spring pre-tightening force at any radius was computed, and was testified by ANSYS. It is known that the results computed are close to that simulated, and the deviation is only 6.6 mm. It is shows that the method of deformation analysis of a throttle slice under micro-circle pressure is reliable, which has important reference value for throttle valves parameters design and characteristic simulation of shock absorbers.
Dynamic Analysis and Multiparameters Optimization of Hydrostatic Supported Worktable System
Authors: Ye Hong Ling , Wen Pin , Zheng Xiao Long
Published: September 2012

The natural frequency at lower orders for hydrostatic supported worktable system may easily give rise to vibration as in resonance with excitation frequency. This paper is concerned with the geometrical optimum design and dynamic modal analysis for system with hydrostatic oil fluid and worktable simultaneously. The variations of eigenfrequency, respect to oil film thickness, outer radius of worktable, recess shape and number, were discussed. The results show that, under linear increment/decrement of geometry dimension, frequency increase/decrease but in nonlinear regularity. Therefore there exists an optimum dimension resulting the optimum frequency that deviate from the rotary frequency at work and its multiple ones. Then two-phase optimization strategy was effectively programmed to get involved with finite element analysis software. It is theoretically critical to get the optimum parameter of hydrostatic supported worktable on how and practically important to guide the design in engineering.
Research on Performances of the Pressure-Exchange Ejector
Authors: Liu Pei Qi , Wei Li , Zhao Wen Jing , Dai Yu Qiang , Hu Da Peng
Published: September 2012

The ejector technology is a commonly used in nature gas exploration. In this article the pressure-exchange ejector is introduced and researched to solve the low efficiency problem of common ejector during low pressure ratio condition. The results show that when pressure ratio is kept fixed, ejection rate decreases with the compression ratio increase, an optimum ratio exist; the pressure-exchange ejector have higher isentropic efficiency and ejection rate when the pressure ratio is under three, it also applies to wilder operation condition. It is both practical valuable and theoretical significant to research on pressure-exchange ejector for China’s gas and oil fields.
Suspension Optimization Based on Ride Comfort and Road-Friendly
Authors: Gang Xian Yue , Zhu Wen Bo
Published: September 2012

In order to analyze suspension’ impact on vehicle ride comfort and road-friendly and the way to chose reasonable suspension parameters，a two DOF suspension model was established. Taking RMS of sprung mass acceleration and dynamic load of unsprung mass, a multi-objective suspension parameters optimization model was carried out by optimal points method. After the optimization，the RMS of body decreases by 36.24%,and the RMS of dynamic load decreases by 17.71%.As is stated above, optimal suspension parameters can improve the ride comfort as well as road-friendly.
Analysis for 2D Flow Field around H-Vertical Axis Wind Turbine with Different Types of Airfoil
Authors: Ye Tao , Liu Meng
Published: September 2012

In this study, moving mesh technique is used to construct an outside flow CFD model around H-vertical axis wind turbine with different types of airfoil. RNG turbulent models and the implicit Couple arithmetic based on pressure are selected to solve the transient equation. From the results of the calculation, the author obtains the velocity field, pressure field distribution of H-type vertical axis wind turbine airfoil at different moments and analyze the wind wheel blade torque variation. The conclusion provides the theoretical basis and a method to optimize aerodynamic performance for the further study of vertical axis wind turbine in the future.
Method of Controlling the Inversion Quality of NMR T2 Spectrum
Authors: Li Peng Ju , Liu Huan Huan , Wei Jia Yin
Published: September 2012

In order to improve the application effect of the NMR in Petroleum exploration and development, the quality of T2 spectrum inversion need to be controlled. Echo resolution matrix,T2 spectrum resolution matrix are deduced, the quality control index of T2 spectrum inversion is provided: the stretch coefficient, maximum, minimum, average and range of principal diagonal elements of resolution matrix. Calculating the inversion quality control index under different observation modes and choosing the observation mode of resolution matrix approximate to unit matrix for data acquisition can improve T2 spectrum inversion quality. Numerical experimentation indicate there is very good consistency between inversion quality and control index. Hence, it may direct the design before NMR data acquisition, control inversion quality of T2 spectrum
Simulation and Research of a Thermal Type Liquid Flow Sensor
Authors: Tian Feng , Gao Zhen Bin , Sun Yi Cai
Published: September 2012

A flow sensor for liquids, based on the principle of fluid-structure heat transfer is presented. The heater and thermistor are integrated and wrapped together as a detector and heat source, allowing heat exchange between the sensor and the fluid. Through numerical simulation, the temperature distribution of the sensor was investigated, under conditions of various flow velocities. The process of turbulent heat transfer in the flow pipe was simulated, the temperature distribution in the sensor was analyzed and compared under different temperature and velocity of the fluid, and the corresponding measuring ranges were determined. The flow detection circuit is designed and the results of water flow velocity tests in the range of (0.01–1)m/s are presented.
The Design of Automatic Testing System of the Central Air-Conditioning Terminal Temperature Based on the Wireless Communication Mode
Authors: Guo Sheng Hui , Zhu Xue Li , Zhu Shu Xian , Zhu Yong Jun
Published: September 2012

Building energy research has been focused on the study of improving the efficiency of equipment operation and operating control mode, rather than the management of central air conditioning system terminal. In fact, large amounts of energy can be conserved through that study. And terminal temperature of the central air conditioning with automatic detection is necessary to fulfill the energy-saving with the management of central air conditioning system terminal. An automatic terminal temperature detection of central air conditioning system based on wireless communication mode has been designed. It can transfer data to the monitoring center to provide reference data to fulfill the energy-saving.
Architecture of Meteorology Observing System Based on Wireless Sensor Networks
Authors: Du Jing Lin , Liu Rong , Xue Jian Jun , Zhou Jie
Published: September 2012

This paper presents an application platform for meteorology observing heterogeneous wireless sensor networks (WSNs) and a data fusion weather platform. We propose system architecture for wireless sensor networks and mesh networks for handling and storing sensor data streams in real-time. It collects data from WSN and continuously transmits physical or metrology conditions at different locations to a remote central data server. A web based platform designed to enable remote online access to WSN data with interactive data retrieval and visualization functionalities.
A Waist-Attached PNS Algorithm Based on MIMU
Authors: Zhou Qi Fan , Zhang Hai , Mao You Ze , Chang Yan Hong
Published: September 2012

Pedestrian Navigation System (PNS) is a system aims at determining the current location of person, recording the walking trajectory. This paper presents an algorithm of PNS based on lowperformance MEMS-IMU attaching to the waist of people. The algorithm consists of step detection, model identification, stride, heading determination and position estimation. A method to identify a user’s status, calibrate the length coefficient K by Least-Squares and update K online according to different models and acceleration is presented, which adaptively adjusts the calculation of stride length in case of different walking speeds and manners. The integration of INS and magnetic azimuth for heading direction is put forward and the walking trajectory is calculated by Dead Reckoning (DR). Several tests have been conducted and the algorithm performed well.
The Effect of Current Density on Zinc Whisker Growth
Authors: Cui Wen
Published: September 2012

Zinc whiskers threaten the safety of electronic components due to their electrical conductivity. Factors that control zinc whisker growth are still unknown. The aim of this study was to investigate the effect of current density (1.5, 2.25 and 3.0 A/dm2) on the formation of zinc whiskers, and to relate this to the microstructure of the deposit. Scanning Electron Microscopy (SEM) analyses show that the surface morphologies of deposits became rougher when current density increased; however, nodule density increased from 25/mm2 to 53/mm2 when current density increased from 1.5 to 2.25 A/dm2, and it decreased to 24/mm2 when current density increased to 3.0 A/dm2. X-ray diffraction analyses (XRD) show that the preferred orientation of deposits remain when current densities increased from 1.5 to 2.25 A/dm2, while it changed to when current density increased to 3.0 A/dm2. Results show that zinc coatings electroplated at 2.25 A/dm2 may have greater risk of whisker growth then that electroplated at 1.5 or 3.0 A/dm2.
Moving Object Detection Based on Improved Variational GAC Model
Authors: Xu Yang , Wu Cheng Dong , Zhao Ying , Zhao Ji , Zhang Xue Dong
Published: September 2012

In view of the detection of moving object in video sequence, the traditional moving object detection algorithms are researched. The paper presents a new algorithm for object detection based on initial contour and improved variational GAC model. First, this method built up background model utilizing Gaussian mixture model and background subtraction to extract initial contour of the object; taking initial contour as initial value of curve evolution. Then, an improved restriction item is introduced into variational GAC vector model, the proposed restriction item that is a nonlinear hear equation with normalized diffusion rate, therefore re-initialization procedure of level set function is completely eliminated. Iteration number of curve evolution and run time is reduced. The experimental show that accurate contour of moving object is got and this algorithm is effective and feasible in real video environment.
MAN-B&W 10L90MC Main Engine a Starting Trouble of Remote Control System Analysis
Authors: Liu Xin Jian
Published: September 2012

Main engine remote control system of modern ship with unattended engine room is vital for the navigational safety , through a starting trouble of the AUTOCHIEF-IV remote control system, analyzes the air starting process of the system from the “Local”“Bridge”“Engine Control Room”position ， identify the trouble reason and solve the fault, put forward the daily work of the special note, provide for work personnel to valuable reference.
The Multi-Deformable Contact Analysis of Rotate Test Tree
Authors: Liu Jing Hua , Hu Gui Chuan , Ding You Qing
Published: September 2012

In order to research contact force between mechanical components of the multi-deformable assembly and product’s reliability, this paper explored the non-linear contact problems by employing the contact mechanics and the finite element method. On the basis of the Lagrange multiplier algorithm, taking multi-deformable assembly as a system, the finite element method is utilized in this paper to analyze the contact cases among deformable components in various conditions, the distribution rules of contact force, the distribution rules of stress and the deformation, with the purpose of figuring out the weakness regions and their solutions.
Theoretical Analysis and Simulation on Seeds Throw Process of Seedling-Sowing Machine
Authors: Luo Xin , Cheng Qian , Hu Bin
Published: September 2012

For the technical problems that traditional Suction Plug Seedling -Sowing machine high positive hole rate which caused by the highly uneven rate of seeds " boiling ", and put forward the “boiling” way that the tray and seeds are throwing up boiling, innovative design of the thrown system which is compose of mechanical spring ,solenoid and suction cup , through to the theoretical analysis of the process of seeds thrown intrasystem,and established a mathematic model between seeds throw height and structural parameter, based on the SolidWorks software environment to build the multi-body system dynamics thrown model, to simulation and verification law of motion of tray and seeds intrasystem. The testing results show that the throw system can realize the "boiling" condition that seeds could adsorption, ensure that when the planter adsorbed seeds it could take a highly uniform on the thrown height, effectively reduce the positive hole rate, provides a new concept, structure and theory for design and research on the Suction Plug seedling-sowing machine seeds "boiling" system.
A Performance Model for U-Tube Ground-Coupled Heat Exchanger
Authors: Ming Gang , Tian Ye , Xia Cai Chu
Published: September 2012

Because of the great advantages of savings for installation costs and areas of the ground, the ground source heat pump (GSHP) system combined with the ground-coupled heat exchanger with structural member is becoming more and more popular such as energy pile foundation etc.. However, the calculation method especially on the perspective of plate-type ground-coupled heat exchanger (PGHE) has not been established. This paper reports a study on a mathematical model developed to analyze the heat transfer of U-tube plate-type ground-coupled heat exchanger (UPGHE) which combined with structural member and an analytical solution is revealed. The results show that there are clear ‘heat submerge’ for the leg with lower temperature of UPGHE and it is more sensible to arrange one leg apart from another. The results also show that the spacing of pipes have obvious impact on the performance of UPGHE and the temperature difference between two legs have no important effect on the total performance of UPGHE.
Influence of Low Temperature Annealing on Structure and Photoelectric Properties of MgZnO Thin Films
Authors: Zhang Xi Jian , Liu Xiao Yu , Zhang Xue Yan , Wang Han Bin , Wang Qing Pu , Ma Hong Lei
Published: September 2012

Structural and optical properties of MgxZn1-xO (x=0.23) thin films grown by radio frequency (R.F.) magnetron sputtering and annealed with different temperature (from 100°C to 400°C) are reported. The films were single-phase, highly c-axis oriented and wurtzite structure. The transmission spectra, recorded in the visible range, reveal a high transmission coefficient (about 95 %) in the obtained films. Besides, when the annealing temperature is 100°C, the crystalline grains are smooth, compact and uniformly distributed. As the annealing temperature increases from 100°C to 400°C, the crystalline grains get larger, but the annealing temperature does not influence optical transmittance obviously.
Numerical Simulation of Primary Support Effect of Tunnel
Authors: Li Fu Xian
Published: September 2012

The tunnel excavation and support process were simulated by using ANYSY. Firstly, support effects were studied on different modes of support. Secondly, numerical simulation was realized by using the function of APDL parametric design language in ANSYS. By discussing the different support effects which were arrived through changing support parameters and geometric parameters, conclusions and recommendations were put forward. At last, it could be clearly seen that the simulation results were in good agreement with the monitoring records.
Design and Simulation Analysis of 1000KN·m Backstop
Authors: Fu Li Hua , Jiang Juan Juan , Zhang Dai Xing , Li Hai Quan , Song Hua , Yu Cheng Zhong
Published: September 2012

In this article, the Pro/Engineer virtual prototyping technology is used for three dimensional entity modeling, assembly, and simulation analysis of 1000KN·m large backstop in four design plans to confirm the integrity and assembling of backstop. By using the ANSYS/LS-DYNA software, it makes numerical simulation analysis of the backstop in non-return process, and through the analysis comparison to the simulation result, it obtains the optimization design plan of the 1000KN·m backstop.
Modeling and Analyses of a Complex Airborne Antenna Positioner for Mechanical - Electromagnetic Analyses
Authors: Zheng Fei , Chen Mei , Song Li Wei
Published: September 2012

The deformations of an airborne waveguide slot array antenna and its positioner will finally influence the electromagnetic performances. Due to the complexity of the antenna and its positioner, effective simplification methods have to be taken for their mechanical - electromagnetic analyses. This paper describes the modeling and analyses of a complex airborne antenna positioner. The simplification method proposed not only keeps the structure features fairly exact, but also keeps the antenna to be exact enough for further deformed electromagnetic performance analyses. The modal analysis results of the whole system are close to the actual test results. It reveals that such simplification is reasonable and accurate.
Analysis and Simulation of a Parallel Platform with 2R-1T
Authors: Yang Qi Zhi , Zi Peng Fei , Chen Long , Zhuang Jia Qi
Published: September 2012

It is described that a parallel platform with three spatial degrees of freedom; the platform is built up by parallel combination of three symmetrical (SPS) and a branched-chain (PU). It is gotten the freedom of the mechanism and the theory expression of inverse kinematics by theoretical calculation. The mechanism was modeled by Pro/E, and the model is imported with Mech/Pro to ADAMS/View for simulation. The trajectory of three kinematic chains that changes over time through computer simulation, which are got by exerting force on the moving platform, is compared with the theoretical calculation results gotten through MATLAB. The results prove that the curve of position is identical, and it testifies the correctness of the movement of the platform.
A Novel Lost Circulation Material: Fuzzy Ball Working Fluids
Authors: Zheng Li Hui , Zhang Zhi Heng , Zhang Ming Wei
Published: September 2012

Fuzzy ball material which imitating the structure of bacteria have been tested and developed as a new lost circulation material. The fuzzy plugging theory include three pressure distribution methods: the pressure decomposition filling mechanism, the pressure reducing filling mechanism and the pressure support filling mechanism. Fuzzy ball material relies on its own particular structure, achieving full-size sealing and self-adjustment to match the porous media. Fuzzy ball working fluids can be prepared without auxiliary equipment and its non-weighted density is 0.85~1.0g/cm3. Its density can be up to 1.2g/cm3 when it is weighted by inert materials to meet the need of near/under balanced drilling. Indoor test showed that novel working fluids have significant inhibitive capacity and sealing characteristic. There are three properties of fuzzy three ball working fluids: inhibitive capacity, anti-temperature capacity and sealing characteristic. Fuzzy ball working fluid has been successful applied in hundreds of wells to solve the problems such as collapse, severe losses and etc.
The Design of Parallel DC-DC Power
Authors: Zhang Hua Lin , Zhou Xiao Fang
Published: September 2012

With TL494 as the drive chip, MCU controlling output voltage, output current, parallel module average flow, over-current protection, it gives priority to BUCK circuit topology to realize parallel switching power supply. This article introduces the system design, the hardware and software design in detail. Finally a 32W prototype is designed. The test result shows that the design can achieve the preset functions, its performances can meet the requirements and it can work stably.
Power System Transient Stability Based on SVM
Authors: Sun Zhen Long , Fan Ai Long , Guan Da Lu
Published: September 2012

In order to overcome the lack of which power system transient stability assessment model can not continue to learn and update the model online, in this chapter, a incremental learning method of support vector machine is proposed . The new data is added to the solution by constructing a recursive solution , which provides a new way of learning online for power system transient stability assessment.