bluuebunny/crossref_metadata_2025 huggingface dataset:
Microstructure and Electrical Properties of ZnO–Bi2O3-Based Varistor Ceramics by Different High-Energy Ball Milling Time
Authors: Zhang Cheng Hua , Li Ming Shuang , Xu Dong , Chen Yong Fang , Liu Yuan Ling , Zhang Ke
Published: March 2012

The microstructure and electrical properties of ZnO-Bi2O3-based varistor ceramics prepared by the high-energy ball milling were studied. The varistor ceramics samples were characterized by XRD and SEM analysis, as well as by dc electrical measurements, such as the nonlinearity coefficients, leakage current and threshold voltage. The best electrical characteristics were found in sample by the high-energy ball milling 1 h and sintered at 1000 °C for 2 h, which exhibited the threshold voltage was 457 V/mm, the nonlinear coefficient was 59.3 and the leakage current was 1.18 μA.
Pythagoras Number Theory and the Scientific Beauty of the Theory Origin
Authors: Wang Zhi De
Published: March 2012

In the long journey of the western aesthetics development, science and aesthetics especially the mathematics and the aesthetics relationship is more intimate. In the ancient Greece civilization, there is a very prominent characteristic, which is a kind of unparalleled thick interesting to question closely to the nature. As they don’t satisfied only stay in the imagination of the world picture view of the poetic in the mythology, and try to use the reason to guide the heaven sent human being’s imagination, they try eagerly to explain the nature order, evolution and movement. When the ancient Greece natural philosophers do the nature science research, they also do the aesthetic research. Pythagoras, as a mathematician and physicist and a astronomer, who with most of the disciples used the nature science view to see the aesthetics problems once at the beginning, which created the second to none of the method of quantitative research of the things.
Preparation and Characterization of Resveratrol-Loaded Hydroxylpropyl-β-Cyclodextrin
Authors: Zhao W. J. , Liu G. Y. , Xia Q.
Published: March 2012

The purpose of this research was to prepare Resveratrol-loaded Hydroxylpropyl-β-Cyclodextrin, and to solve solubility and stability limitation of Res. Res-loaded HP-β-CD was prepared by freeze-dryer , then its solution was adjusted to different pH value, and finally its identification and content were analyzed by UV spectrophotometer. Res-loaded HP-β-CD prepared here was water soluble, and after pH adjustment, its appearance was improved.
Research on Lubricating Property of Piston Pin
Authors: Huo Ping , He Chuan , Tian Lv Zhu , Li Yu Hong
Published: March 2012

The lubrication model of connecting rod small end is established based on AVL Excite Designer software. On the based the four-cylinder diesel engine, the key to the study is the variation of oil-film thickness between the piston pin and the connecting-rod bush. The relationship between the oil film and the engine rotate speed is analyzed, and the results indicated that variation amplitude of the oil film thickness becomes smaller by the engine rotate speed increases, and the average film thickness is increased
Preparation of β-PbO2 and β-PbO2-MnO2 Coating on Stainless Steel Substrate
Authors: Yu Qiang , Chen Zhen , Guo Zhong Cheng
Published: March 2012

In order to prepare a new type of anode material, stainless steel was selected as substrate material. The β-PbO2 coating on stainless steel substrate was prepared under the appropriate plating solution, and the PbO2-MnO2 coating was prepared with thermal decomposition. The crystal structure was determined by X-ray diffraction; Surface morphology was test by Scanning Electron Microscopy; the energy spectrum was used to determine element mass-fraction and the ratio of atomic number of the coatings.
Study of an Inorganic Ion Exchanger Al1.25Fe0.75(PO4)2
Authors: Jiang Jin He
Published: March 2012

New complex inorganic ion exchanger Al1.25Fe0.75(PO4)2 is synthesized. Chemical composition, structure and some related properties and complex mechanism of this ion exchanger are investigated by electron microscopic, X-ray diffraction and chemical methods. The ion exchange behavior of Al1.25Fe0.75(PO4)2 has been studied in detail. Results of column test indicated, that the exchange capacity obtained from tests for Li+ in 0.1mol /L HNO3 solution is 7.0mmol/g.
Study on Preparation of Gradient Porous Ti by Powder Metallurgy Method
Authors: Li Qiang , Yu Jing Yuan , Zheng Er Yong , Sun Ze , Zeng Yu Shan
Published: March 2012

Gradient porous Ti was prepared by powder metallurgy method using NH4HCO3 as pore former. The effect of content and distribution of NH4HCO3 and sintering temperature on pore characteristic, sintering shrinkage, flexural property was studied. Stress-strain curves of gradient and uniform porous Ti material were compared. The results show the porosity, sintering shrinkage rate and flexural strength vary from 51.8% to 41.3%, from 23.5% to 28.7%, and from 145.7 MPa to 221.6 MPa when the distribution of NH4HCO3 varying form uniformity to gradient. Additionally, with the increase of sintering temperature, the porosity of gradient samples first increases and then decreases. When sintered at 1573K for 2h, the porosity of gradient porous Ti has the maximum of 45.6%. Moreover, there is pseudo yield phenomenon according to the test curve of three points bending of the gradient porous Ti with three layers structure.
Startup Research of DIC Hydrolysis Acidification Reactor in Printing and Dyeing Wastewater Treatment
Authors: Guo Yong Fu , Chu Jin Yu , Liu Yong Jian , Zhang Wei Jia , Xu Le Zhong
Published: March 2012

As the main source of textile industrial pollution, printing and dyeing wastewater is usually difficult to be biodegraded. In this paper, a unique hydrolysis acidification reactor with double circulation sludge recycling system (DIC) is designed to treat simulated printing and dyeing wastewater. The results show that DIC reactor can realize quick startup with concentrated sludge of sludge concentration tank as inoculated sludge. And DIC reactor has high removal capabilities for CODcr and chroma, with efficiencies of about 70% and 60%, respectively. The sludge concentration is obviously increased. Moreover, the biodegradability of wastewater has been greatly increased to 0.38, which is favorable to the removal of organic pollutants in wastewater.
Study on the Ductile-Mode Milling of Brittle Ceramics
Authors: Cheng Xiang , Gao Bin , Liu Jun Ying , Yang Xian Hai
Published: March 2012

Hard and brittle materials such as silicon and ceramic materials are difficult to machining due to their brittle properties. By the ductile-mode machining, delicate features with high accuracy can be created on these materials by mechanical micro/nano machining. This paper introduced the experimental study on the ductile-mode milling of ceramics. First, the experimental background and plans have been introduced. Then, on the sub-micron milling center, experimental results show that ductile-mode machining can be achieved. Both machining parameters and machining conditions are very important in order to realize the ductile-mode machining
Startup Research of Integrated Anoxic Aerobic Process in Printing and Dyeing Wastewater Treatment
Authors: Guo Yong Fu , Yang Hai Hua , Hao Zhi Sheng , Mu Tao , Cao Yu , Chu Jin Yu
Published: March 2012

Based on the treatment situation and the modification of effluent standard of printing and dyeing wastewater, a novel integrated and three-dimensional anoxic-aerobic process (A/O) is put forward. The experiment studies the startup of A/O process with simulated printing and dyeing wastewater. The results show that the removal efficiencies of CODcr, NH4+-N and chroma are 67.6%, 90.9% and 54.5% at the steady stage, respectively. The novel A/O process has perfect and steady performance for treatment of printing and dyeing wastewater.
Synthesis and Properties of a Novel Unsymmetrical Diarylethene with Five and Six Ring Aryls
Authors: Geng Wei Wei , Pu Shou Zhi , Cui Shi Qiang
Published: March 2012

A novel photochromic diarylethene with thiophene and benzene compound, 1-{[2-methyl-5-(1, 3-dioxolane)-3-thienyl]}-2-(2-cyanophenyl)perfluorocyclopentene(1a) has been synthesized. Its photochemical properties, including photochromic behavior and fluorescent features, have been investigated in detail. The compound showed good photochromism both in solution and in PMMA. The diarylethene exhibited a fluorescence switches along with the photochromism from open-ring isomers to closed-ring isomers. When irradiated by UV light, the photocyclization reaction was occurred and the emission intensity of the diarylethene decreased significantly, due to producing the non-fluorescence closed-ring isomers. The back irradiation by appropriate wavelength visible light regenerated its open-ring isomers and recovered the original emission intensity.
Study on the Dynamic Lubrication Characteristics of Water Lubricated Rubber Bearing
Authors: Liu Jian Hua
Published: March 2012

Adopted the coupling method and considered the elastic deformation，the paper did the numerical calculation for a water lubrication rubber bearing used horizontal installation. And by means of the finite element analysis software, the nonlinear contact was studied. The results of water film pressure, water film thickness, carrying capacity and deformation of rubber bush are analysed, and draw some useful conclusions. The results provide design basis and reference information for the dynamic calculation to rubber bearing.
Synthesis, Optoelectronic Properties of a Novel Photochromic Diarylethene Bearing Phenyl and Benzofuran Group
Authors: Jiang Duo Hua , Liu Gang , Liu Wei Jun , Cui Shi Qiang
Published: March 2012

An unsymmetrical diarylethene derivative bearing both phenyl and benzofuranyl, in which a trifluoromethyl group was substituted at the para-positions of the terminal phenyl ring, was synthesized. At the same time, its photochromic properties and fluorescence switch were investigated in detail. The results showed that this compound exhibited reversible photochromism, undergoing reversible cyclization and cycloreversion reactions upon alternating irradiation with UV and visible light both in solution and in PMMA film, and its absorption maxima were observed at 498 nm in hexane and at 505 nm in PMMA amorphous film, respectively, upon irradiation with 297 nm UV light. In hexane solution, the open-ring isomer of the diarylethene 1 exhibited relatively strong fluorescence at 419 nm when excited at 330 nm
The Design of the Wind-Light Complementary Street Lamp
Authors: Li Cheng Qun , Zhou Xuan , Wang Xin
Published: March 2012

This article describes the street lamp of the daily life ,which brings the long lines of the low voltage transmission and the high cost of the construction and so on. In view of these problems, the Wind-light Complementary Street Lamp is designed. According to the complementary street lamp system’s composition and working principle, and the analysis of wind power, solar energy power generation and the control strategy of battery charging, thus chooses the Single-chip microcomputer as the controller of it, as to fulfills the efficient and reasonable power generation goal.
The Building of Debris Flow Monitoring and Warning System Based on Zigbee Protocol Using Multi-Sensor Technology
Authors: Yang Yi Jin , Gu Quan Yu , Tan Wei Jie , Shang Yun Qiang , Yang Ya Wei
Published: March 2012

We built a monitor and warn system based on Multi - sensor network, which could monitor data in real time. In order to imitate scene of the monitor areas, we have built a sand table model according to topographic feature, it changed the traditional monitor methods. In this system, we not only designed the hardware, but also investigated the relationship between the sensor nodes distribution and areal geology. The designing methods and ideal of this system also could apply to environmental monitoring and forest fire prevention system.
The Intelligent Bridge Health Monitoring System Based on Optical Fiber Sensing Technology
Authors: Yue Li Na , Xiang Shao Jun , Yang Yan
Published: March 2012

This paper focuses on the application of Optical fiber sensing technology in bridge health monitoring. The health and safety monitoring system of the new large bridge based on the fiber Bragg grating (FBG) sensing technology of Hubei Jing Yue Yangtze River Highway Bridge as an example, its health and safety monitoring system in using period based on FBG sensing technology was introduced in detail. The construction and the key point monitoring sensors design of the intelligent system were shown in the paper.
The Study of Counting the Strapping Steel Pipes Based on Image Recognition
Authors: Li Xue Hua , Liang Hui Min , Cao Zhi Kai , Jiang Zhong Yun , Chen Long
Published: March 2012

The accurate count has been realized and the expected results have been acquired by the image of the end of steel pipes recognized, which has a good market prospect and economic profit. The mathematical morphology was used to preprocess image and inspect the edge of the target. An improved Hough Transformation was applied to recognize inner diameter of steel pipes, which improved the detection rate. The Hu invariant moments described in the area was used to recognize inner diameter of steel pipes, which realized the pipe sum accurately. The method to count points was used to realize the sum of pipes according to the condition that the inner diameter circus of binary pipe image was corroded more times came to change into small area.
Virtual Prototype Simulation of Fine-Adjustment System Kinematics for Segment Erector of Tunnel Boring Machine
Authors: Li Gang , Chen Ya Dong , Wang Bo , Wang Wan Shan
Published: March 2012

In this paper, we present the modeling and kinematics simulation of fine-adjustment system for segment erector of tunnel boring machine (TBM), which is performed in the virtual prototype platform. The 3D virtual assembling model of fine-adjustment system is built with Pro/E software according to its design parameters such as structure and size. After the interference inspection, the model is imported into ADAMS through the interface module of Mech/Pro. The model is simplified and optimized reasonably and various constraints are applied under variety working conditions. The results of simulation show that the design has three degrees of freedom movement capacity which meets the design requirements. At the same time the kinematics characteristics of each part along three different directions are obtained and they will provide some references for the further optimal design.
The Preparation of Al–Cu–Fe Quasicrystalline Coating by Low Power Plasma Spraying
Authors: Li Jie , Jiang Da Qiang , Jiao Shu Jing , Cui Li Shan
Published: March 2012

Al-Cu-Fe with an atomic ratio of 70:20:10 was selected for preparing the quasicrystalline coating by low power plasma spraying. X-ray diffraction (XRD) and scanning electron microscope (SEM) were used for analyzing the phase component and microstructure of the quasicrystalline coating. It was found that the best quality of quasicrystalline coating was obtained under a current of 400A and a voltage of 40V. XRD results show that, using these parameters, a relatively higher content of quasicrystalline phase can be acquired in the coating. SEM results show that the sprayed coating has a low level of porosity.
Research on Deformation Properties and Boundary Effect of Composite Sandwich Structure under Deep Hydrostatic Pressure
Authors: Qiu Jia Bo , Mei Zhi Yuan
Published: March 2012

Composite sandwich structures have been used more and more widely in the underwater structures, therefore deformation problems under deep-water hydrostatic pressure can not be ignored. For the deformation properties of composite sandwich structures under deep-water hydrostatic pressure, the paper carried out theoretical and test research. First, the paper analyzed the surface deformation features as well as the law of the element’s cross-sectional dimension, the core thickness and elastic modulus to the surface deformation by establishing theoretical analysis model; The results show that the deformation area can be divided into central area and boundary area, and the boundary effect is an important factor affecting the deformation, the core parameters can affect the reach of boundary effect. Second, the paper carried out hydrostatic test of composite sandwich structural element model, and then verified the theoretical analysis model’s rationality and accuracy by comparing the test results and theoretical results.
Delay-Dependent Robust Strictly Dissipative Analysis for a Class of Singular LPV Systems with Delays
Authors: Wang Yan Tao , Wang Xin , Zhang Rui Zhi , Zhang Xing Hua
Published: March 2012

Delay-dependent robust strictly dissipative analysis for a class of singular linear parameter-varying (LPV) systems with delays is investigated in this paper. By constructing a proper Lyapunov functional and using matrix inequality techniques, a delay-dependent robust strictly dissipativity criterion for a class of singular LPV systems with delays is derived. A numerical example is presented to demonstrate the effectiveness of the proposed method.
Pattern Recognition Based on New Distances between Intuitionistic Fuzzy Sets
Authors: Feng Yu , Chen Dong Feng , Liu Hui
Published: March 2012

In the application of intuitionistic fuzzy sets(IFSs), distances and similarity measures play very important roles. In this paper, firstly, the modified definition of normalized distance and degree of similarity between IFSs are introduced, which are proved to be more reasonable than some existing definitions. Then, the relations between normalized distance and degree of similarity are analyzed. New distances and similarity measures between IFSs are proposed and corresponding proofs are given. Finally, a comparison of application to pattern recognitions is made to show the proposed distances and similarity measures are more reasonable than some existing methods.
Preparation of Quartz Nano-Powder Based on GA-BP Neural Network
Authors: Jin Yuan Qiang , Ma Hui Ping
Published: March 2012

In this paper, The authors briefly Analyzed the process parameters on the effect of quartz nano-powder preparation. used orthogonal experiment to study the test method of quartz nano-powders prepared by ball milling, applicated artificial neural network technology to build a prediction model of powder parameters based on BP network and optimized the BP network weights and improved the prediction model of quartz particle size based on BP network by using the global search capability of genetic algorithm . This study showed that the model has higher accuracy and realize acceptable prediction of powder particle size.
Naive Bayes Classification Algorithm Based on Optimized Training Data
Authors: Zhu Xiao Dan , Su Jin Song , Wu Qing Feng , Dong Huai Lin
Published: March 2012

Naive Bayes classification algorithm is an effective simple classification algorithm. Most researches in traditional Naive Bayes classification focus on the improvement of the classification algorithm, ignoring the selection of training data which has a great effect on the performance of classifier. And so a method is proposed to optimize the selection of training data in this paper. Adopting this method, the noisy instances in training data are eliminated by user-defined effectiveness threshold, improving the performance of classifier. Experimental results on large-scale data show that our approach significantly outperforms the baseline classifier.
A Novel Hierarchical Dynamic Video Summarization Representation for Video Analysis
Authors: Li Xiang Wei , Kang Yu Xiu , Zheng Gang
Published: March 2012

Based on Rough Sets (RS), a novel effective video summarization representation was proposed for video analysis in compressed domain. Firstly, DCT coefficients and DC coefficients are extracted from original video image sequences, so an Information System can construct with DC coefficients. Then, Information System is reduced by attributes reduction theory of RS, the representation of the video frame is achieved by reduced DC coefficients. Finally, the reduced Information System can be achieved. Since the Core of Information System contained all major video information in video sequences, which banished the redundant video frame, so it can be considered as the efficient summarization representation. Compared to conventional or existing algorithm, the algorithm enjoys following advantages. (1) Only a subset of video frames considered during video analysis, so it can avoid the computational complexity. (2) The video summarization representation becomes more scientific and efficient than previous methods. (3) According to the reduced frame number, the algorithm can extract hierarchical dynamic video summarization representation.
Remote Improved Inspecting Gas Sensing System Based on CAN Communication
Authors: Jiang Jian Ming , Bing Shi , Ma Zhen Hua
Published: March 2012

This paper presents a new method for inspecting the consistency of methane based on controller area network (CAN) nodes. It is advantageous for control center to keep fluent communication with far excavate coal spot; it enhances the safety factor and solves the problem of telecommunication. The catalytic burning technique to inspect the concentration of methane is introduced. It is also illuminated how to use MCU and SJA1000CAN controller to construct the communication node of CAN
Precision Analysis for the 3-PRS Parallel Robot
Authors: Hu Shi Jie
Published: March 2012

The precision analysis of a 3-PRS parallel robot with three DOFs has been studied in this paper. The 3-PRS parallel robot has been introduced with its kinematics analysis. The closed-loop vector model has been introduced. By the differential method, the mathematic error model of the position and orientation has been built. The forward error solution has been deduced including all the structural errors. Given the structural errors, the output errors of the parallel robot can be solved by the introduced model. The effect of the variation of the position and orientation of the 3-PRS on the output errors of the parallel robot have been analyzed
A New Coarsening Strategy for Multilevel Graph Partitioning
Authors: Yao Lu , Wang Zheng Hua , Cao Wei , Li Zong Zhe
Published: March 2012

When applying multilevel scheme to solve the graph partitioning problem, shortcomings and limitations exist in the state-of-the-art coarsening schemes depend mainly on finding maximal matchings to obtain the coarse graphs, which can cause the multilevel algorithms to produce poor-quality solutions. This paper proposes an improved coarsening scheme by improving vertex combining strategy and edge ordering criteria. The new coarsening scheme is more effective in quality, which is proved by both theoretical analysis and experimental results.
Research of Company Internal Control Evaluation Based on Space Statistical Distance Evaluation Method
Authors: Lin Zhi Hong , Yang Shuo
Published: March 2012

The internal control is one of the core problems in enterprise management, which not only relates to the company's quality, but also affects its own long-term development. It is especially important to take effective implementation evaluation for internal control distortion caused from the existing financial fraud in company. In this paper the internal control evaluation index system which had already set was further improved. And this paper evaluated the intensity of enterprise internal control combined with space statistical distance evaluation method on the whole. It can provided the reference for managers when they adopt corresponding countermeasures for the problem of internal control.
Research on Multi-Level Modeling Method for Aircraft Assembly Line
Authors: Liu Xia , Ye Wen Hua , Wei Bi Sheng , Leng Sheng
Published: March 2012

The process time of aircraft assembly line is easily influenced by the efficiency of workers, the supply circumstance of components and the assembly quality. While the aircraft assembly line is hardly to reconfigure after it is in use, in order to optimize the assembly line before its application, a new object-oriented modeling method based on hierarchy and stochastic petri net has been put forward in this paper. The behavior and the structural characteristics of the model have been analyzed according to the solution of linear invariant. Finally, the model of aircraft wing assembly line has been established as an example, which proves the feasibility of the modeling method.
A Screw Dislocation Interacting with a Lip-Shaped Crack Bonded by a Strained Reinforcement Layer under Remote Longitudinal Shear Load
Authors: Yu Min , Liu You Wen
Published: March 2012

The interaction between a screw dislocation and a reinforced lip-shaped crack embedded in an infinite matrix subjected to a remote longitudinal shear load is investigated in this paper. By combining the sectionally holomorphic function theory, Cauchy singular integral, singularity analysis of complex functions and Riemann boundary problem, the problem is reduced to solve an elementary complex potentials equation. The general expressions of complex function in the matrix and the reinforcement layer are derived explicitly in series form for the case when the screw dislocation is located in the matrix. The image force acting on the screw dislocation and the stress intensity factor are also calculated. Some numerical results are provided to discuss the effects of dislocation position, material parameters, geometric configurations and eigenstrain on the image force.
Study on Novel Automatic Steel Bundling Machine Pneumatic Control System
Authors: Li Cheng Qun , Gao Liang
Published: March 2012

This paper introduces a new type of automatic steel bundling machine for bundling process, which includes a pneumatic action process, mainly do some researches on the pneumatic control system. The system chooses PLC as the core control component, puts forward the hardware of control system and control flow. Eventually we have been designed the control program.
A Circuit Model of Quantum Cascade Laser Based on a Numerical Analysis
Authors: Yang Jie , Zhou Wei , Li Xiang , Wu Jie , Xia Su Jing
Published: March 2012

Based on the dynamic analysis and numerical computation of quantum cascade laser(QCL), a simple equivalent circuit model of QCL was established, in which we considered the spontaneous emission effect for QCL's start delay. The direct current(DC), transient and frequency response characteristics of QCL were obtained by means of the circuit simulation of PSPICE program, and some relevant parameters that may affect the QCL performance have been analyzed. The results of simulation are consistent with that of numerical calculation in previous literatures.
Study on on-Line Fault Diagnosis of Torque and Position Sensor of EPS Based on Artificial Neural Networks
Authors: Gu Jun
Published: March 2012

The strategy of the On-line Fault Diagnosis of the torque and position sensor of the EPS system based on the artificial neural networks (ANN) is advanced in this paper. The strategy is modeled, simulated and analyzed in ANN Toolbox of Mat lab. The results show that the strategy is effective and it can be applied in the development of EPS fault diagnosis.
Study on the Hydraulic Relationship between Molin River and Groundwater
Authors: Wan Yu Yu , Liu Fu Tian , Lin Guang Yu
Published: March 2012

Molin River catchment is located in arid and semi-arid region in China. River water and groundwater are major water sources in this area. It is a key work to identify the interaction between river water and groundwater for not only water resources assessment and sustainable development, but residents living, industry and agriculture and environment protection. In this study, the interaction of Molin River water and groundwater has been analyzed systematically with hydrogeochemical and isotopic methods based on analyzing the characteristics of groundwater hydrodynamic field. The results show that Molin river water originates from groundwater in river source and is recharged by precipitation and groundwater with different recharge intensity along river flow. From the conclusions, it is obviously that these two parts of water cycle can not be departed, and their interactions need to be considered comprehensively in water resources assessment and development in order to avoid irreversible surface ecological environment damage in Molin River basin
The Logistics Warehouse Management and Control Integrated System Based on Information Fusion
Authors: Liu Jun , An Ya Wen , Qian Yan
Published: March 2012

CPS has five functions of computation, communication, precise control, remote collaboration and autonomy, so there are broad prospects to do research on applying CPS to the warehouse management and control integration system. At present, it has considerable difficulties to design low-cost, real-time networking, predictable and strong robustness embedded systems for mature hardware technologies. The existing computer software technologies do not support to generate predictable and high reliable computing system. The application and development of CPS still need to study and solve many foundational scientific problems. On the basis of analyzing technological characteristic and technological potentiality of CPS, this paper provided a method which described the feedback working mechanism of the basic function of CPS unit, provided a common system architecture of the warehouse management and control integration system according to the characteristic of warehouse management, analyzed its working mechanism in detail, envisaged the application prospect of present research project
The Measurement Method for the Stealth Performance of Large-Electric-Size Unmanned Aircraft
Authors: Guo Wen Sheng , Liu Hong Yi , Feng Wei
Published: March 2012

RCS is an important indicator to evaluate the performance of an unmanned aircraft. It is often costly to measure the dynamic RCS of a large-electric-size unmanned aircraft. To solve the problem, a scale formula for RCS measurement is deducted from the Maxwell Equations. With the formula, the RCS of a large-electric-size unmanned aircraft can be calculated based on the RCS of a scale model. Furthermore, the method of calculation the dynamic RCS of an unmanned aircraft based on its static RCS and its flight paths is brought forward.
The Research on Implementation Effect Evaluation ERP Financial Management of Electric Power Enterprise
Authors: Guan Min Li
Published: March 2012

After the implement of ERP system in electric power enterprise, the enterprise's management had a great change. Financial management work, as an important part of enterprise management, the improving of the performance of it will have an important impact on the management of the whole enterprise competitiveness. This paper mainly analyzes the implementation effect of electric power enterprise ERP financial management. By constructing evaluation index system, using the AHP method to analyze it, and then have a conclusion that the quantitative evaluation results, what will have a strong boost role to the electric power enterprise ERP financial management work.
The Similarities and Differences of Speech Communication between Face-to-Face Situations and Electronic Situations
Authors: Xie Qing Guo , Cao Yan Hui
Published: March 2012

With the development of electronic media and the demand of human, speech communication becomes more and more diversified and important. Face-to-face Speech Communication(FSC) is the most basic form and the flourishing of Electronic Speech Communication(ESC) indicates rejuvenation of oral tradition. This paper aims at demonstrating the similarities and differences between FSC and ESC through literature review and observation. FSC is highly dependent on communication environment while ESC depend upon other non-verbal symbols which determine communicator’s image; in terms of communication content, both of them are full of characteristics of oral language, but have significant differences in information code and language regulation; From the perspective of emotion interaction, FSC pays more attention to face-work while ESC focuses on confrontation performance to create exciting point.
The Motion Simulation of Humanoid Robots Based on Adams
Authors: Fan Bing Hui , Zheng Yi , Yuan Cheng Zhi , Lu Xiao
Published: March 2012

This paper uses the 3D modeling software SolidWorks to establish the virtual prototype of humanoid robots. It is introduced into Adams through the interface between SolidWorks and Adams, and we made a simulation of the robot by dynamics analysis software Adams. It showed the method function expressions and torque curves of the robot, and provided reference for the motor selection and design of robot.
The Study of Opening Control Algorithm for Proportional Vales which are with Pressure Compensators
Authors: Liu Guo Ping , Yu Jian Yu , Hu Rong Hua
Published: March 2012

It is essentially the precise control of opening that proportional valve flow control. This thesis establish mechanical model for proportional vales which with pressure compensators under the condition of steady-state, and experimental verification has been given, the result prove that electromagnetic force needs two mutations, while the normal PID can’t fulfill the requirements. The thesis has designed the algorithm of differential first PID, It is proved that this algorithm can fulfill the mutation of electromagnetic forces, We have achieved good linear relationship between setting point and actual point.
Three-Dimensional Dynamic Analysis of Sluice Structure
Authors: Zhang Xiao Yan , Li Ze , Wang Long
Published: March 2012

In this paper a sluice project is taken as an example. Dynamic finite element method is used to analyze dynamic response of sluice structure under the action of seismic acceleration (0.157g). The subspace iterative method is used in the modal analysis of the sluice structure after the finite element model is established, the natural vibration frequencies, and mode shapes are obtained. And then the response spectrum method is employed to implement dynamic response of the structures. The results show that the dynamic stress concentrations take place on some regions
Simulation Research of the Ship Course Control System
Authors: Gao Hong Wei
Published: March 2012

In order to ensure the safe navigation, the ship course control problem is considered. By developing a sensitivity approach and the internal model principle to a ship control system, a course controller is designed. Simulation research shows that, by using the proposed control law, the ship can sail along the desired orientation with minimal energy when there are no current, wind and waves, while the controller can adjust the yaw angle caused by the external disturbances to the desired orientation fast.
Structure Optimization Design and Airflow Numerical Simulation for Negative Pressure Isolated Cabin
Authors: Zhang Yan Jun , Tian Feng , Yang Jian , Sun Qiu Ming , Hu Ming Xi , Sun Xiao Jun , Li Peng
Published: March 2012

Structure optimization design of negative-pressure isolated cabin and numerical simulation for airflow are preformed by using CFD method，and trace of expiration contamination by patient are studied. Results show that when area of outlet setting as 4235mm2, the negative pressure in cabin reached -31.96 Pa meeting to the design requirements. And air flow rate near the head of the body are 0.14m/s, which is comfort for human and closing to test value(0.11m/s). Flow rate and pressure in the cabin distributed evenly in the most of the space of cabin, by which bio-safety and comfort was assured . Results also show that fresh air, after fully spreading, formed airflow to the feet above chest which can drive contaminants expelling from the mouth forming one-way flow to the feet direction, which can ensure maximum exhaust to discharge from cabin and air quality in the cabin improved.
Object Tracking with Gradient Part-Based Models
Authors: Li Yang , Wang Jia Bao , Lu Jian Jiang , Miao Zhuang , Fang Peng Fei
Published: March 2012

Partial occlusion and non-rigid variation are challenging problems in object tracking. To address this problem, robust gradient part-based models are proposed for object tracking in this paper. Our models constructed multiple well-chosen parts based on the gradient energy map of the object. And the local optimization algorithm, mean shift, is used to search the best locations of the multiple parts, which can be used to rectify the location of the tracked object by weighted feedback. Meanwhile, the models of the root and parts are updated online, which can improve tracking accuracy and robustness. Further, our models are easy to be embedded into different tracking algorithms and we implement the mean shift based on gradient part-based models. Experiments results show that our gradient part-based models are robust enough for object tracking, even though the objects are non-rigid or occluded.
A Vehicle On-Board Alcohol Detection System Based on Integrated Multi-Sensors
Authors: Fu Li , Wang Jun Xiang
Published: March 2012

A design and implementation of a detection system for dangerous driving was proposed based on multi-sensor-fusion. It is actually an embedded system consisting of visual,sensor, acceleration sensor, alcohol sensor input, and ARM cortex-M3 microcontroller. Experiment results show that the system has high linearity, high sensitivity,and excellent real-time performance. It can be further used to validate the multi-sensor information fusion algorithms in the field for improving the low reliability of the current detection by using one single-sensor method
Pressure Measurement System Design and Controlling Study on the Double-Clutch Automatic Transmission
Authors: Liu Guo Qiang , Sun Wei , Chen De Min , Guo Xiao Lin
Published: March 2012

Dual-clutch automatic transmission with two clutches alternate way to achieve work uninterrupted power shift, showing the precise control of the clutch in the dual clutch automatic transmission is extremely important, From that point the text, the design of a converter based on AD7731 dual clutch automatic transmission pressure measurement system, the analysis in detail the system design and the corresponding interface circuit, the test results show that the pressure measurement system design can be very good to meet the needs of the clutch pressure measurement system
Moving Target Detection and Segmentation Method Research in Intelligent Transportation System
Authors: Zhang Yi , Sun Hui Zhi
Published: March 2012

This paper proposes a new algorithm for the detection of moving objects based on picture blocks and HVS color space of image differences techniques. The experimental results show that this algorithm can overcome the weakness of image background differencing and coterminous frame differencing method and suppress shadows effectively with advantages of self-adaptation and high speed. It can be used to detect the high-speed moving objects in the complex.
The Phase Stability in the Fe-B Binary System: Comparison between the Interstitial and Substitutional Models
Authors: Abdellah Z. Nait , Chegroune Redoune , Keddam Mourad , Bouarour B. , Haddour L. , Elias A.
Published: March 2012

In the present work, a thermodynamic study was carried out in order to analyze the thermodynamic stability of the and phases in equilibrium with the phase using the calculation of phase diagrams (Calphad) formalism. The two phases and are modelled as substitutional and interstitial solid solutions of boron. The expressions of the chemical potentials ofBandFeare derived in both phases to perform the thermodynamic calculations. A comparison is made between the results provided by the substitutional and interstitial models and good agreement is observed between these two models.
Molybdenum Disilicide - Diffusion, Defects, Diffusion Correlation, and Creep
Authors: Mehrer Helmut , Schaefer Hans Eckhardt , Belova Irina V. , Murch Graeme E.
Published: March 2012

Molybdenum disilicide (MoSi2) is an interesting material for high-temperature applications. It has a high melting temperature, good thermal and electrical conductivity and an excellent oxidation resistance. For many years the primary use of MoSi2has been in heating elements, which can be used for temperatures up to 1800°C. Since the 1990s the potential of MoSi2as a high-temperature structural material has been recognized as well. Its brittleness at lower temperatures and a poor creep resistance above 1200°C have hindered its use as in load-bearing parts. These disadvantages may be offset at least partly by using it together with a second material in a composite or an alloy. Projected applications of MoSi2-based materials include, e.g. stationary hot section components in gas turbine engines and glow plugs in diesel engines. For future research and development directions of MoSi2-based composites diffusion is a crucial property because creep is closely connected with diffusion. This paper is devoted to the basic diffusion and defect properties of MoSi2. Data of Si and Mo as well as Ge diffusion from the Münster laboratory for both principal directions are briefly summarized. For all three kinds of atoms diffusion perpendicular to the tetragonal axis is faster than parallel to it. The diffusivities of Mo in both directions are many orders of magnitude slower than those of Si and Ge. The huge asymmetry between Mo and Si (or Ge) diffusion suggests that atomic motion of each constituent is restricted to its own sublattice. Positron annihilation studies on MoSi2from the Stuttgart laboratory are reviewed as well. They show that formation of thermal vacancies occurs primarily on the Si sublattice but cannot exclude vacancy formation on the Mo sublattice at higher temperatures. Correlation factors for Si and Mo diffusion via sublattice vacancies in the respective sublattices of MoSi2have been calculated recently mainly by Monte Carlo simulation techniques and are also briefly described. Diffusion, in particular self-diffusion, is discussed in connection with literature data on high-temperature creep, which is diffusion-controlled. Grain-size effects of creep have been reported and can be attributed to Nabarro-Herring and Coble creep. Power-law creep is attributed to diffusion-controlled dislocation creep. Some details are, however, not completely understood, presumably due to a lack of theoretical concepts for creep in uniaxial, stochiometric compounds and due to missing information on grain-boundary diffusion.
Interface Controlled Diffusional Creep of Cu + 2.8 at.% Co Solid Solution
Authors: Zhevnenko Sergei , Gershman Eugene
Published: March 2012

High-temperature creep experiments were performed on a Cu-2.8 ат.% Co solid solution. Cylindrical foils of 18 micrometers thickness were used for this purpose. Creep tests were performed in a hydrogen atmosphere in the temperature range of about from 1233 K to 1343 K and at stresses lower than 0.25 MPa. For comparison, a foil of pure copper and Cu-20 at.% Ni solid solution were investigated on high temperature creep. Measurements on the Cu foil showed classical diffusional creep behavior. The activation energy of creep was defined and turned out to be equal 203 kJ/mol, which is close to the activation energy of bulk self-diffusion of copper. There was a significant increase in activation energy for the Cu-20 at.% Ni solid solution. Its activation energy was about 273 kJ/mol. The creep behavior of Cu-Co solid solution was more complicated. There were two stages of diffusional creep at different temperatures. The extremely large activation energy (about 480 kJ/mol) was determined at relatively low temperature and a small activation energy (about 105 kJ/mol) was found at high temperatures. The creep rate of Cu-Co solid solution was lower than that of pure copper at all temperatures. In addition, the free surface tension of Cu-2.8 ат.% Co was measured at different temperatures from 1242 K to 1352 K. The surface tension increases in this temperature range from 1.6 N/m to 1.75 N/m. There were no features on the temperature dependence of the surface tension.
Determination of Intrinsic Diffusion Coefficients in Binary Alloys with Variable Molar Volume by the M-M Method
Authors: Shimozaki T. , Okino Takahisa , Lee C.G.
Published: March 2012

The Multiple-Marker (M-M) method is useful because it enables the determination of the intrinsic diffusion coefficients not only at the Kirkendall marker position but also at places where the M-M are located. However, the analysis is not applicable to the alloys with variable molar volume. In this work, a new graphical method that is applicable to the alloys with variable molar volume is proposed.
Electrophoretic Deposition of Polyaryletheretherketone (PEEK) from a Matching Density Solvent Mixture
Authors: Hope Janet , Hope Peter
Published: March 2012

nvestigating the electrodeposition properties of PEEK from solvents such as ethanol and acetone presents difficulties due to the higher density of the polymer particles relative to that of the solvent. The settling rate in unagitated baths is too rapid to obtain consistent deposits. Whole-bath or bulk agitation aimed at maintaining particle suspension can disturb electrodeposits due to eddies and other turbulent flow effects. To eliminate settling, mixtures of two solvents have been employed, the individual solvents having respectively lower and higher densities than PEEK. The proportions of the mixture are adjusted to be the same density as PEEK so that a colloid-like suspension of PEEK particles is possible. This enables the electrodeposition of PEEK to be studied without any significant gravitation or whole-bath agitation effects. Eliminating mechanical agitation of the suspension enables a study of the influence of target electrode movement alone on the rate and quality of electrodeposition. Note: The origin of this paper is in a project to establish if PEEK could be applied as a controllable conformal thin film onto a specific non-planar substrate geometry by using electrophoretic deposition. The paper describes only the development of a reliable methodology to investigate the feasibility of this project. The details of the project as a whole are outside the scope of the paper.
Mechanical and Tribological Properties of Al2O3-ZrO2 Based Composites Prepared by EPD
Authors: Hvizdoš Pavol , Puchý Viktor , Drdlík Daniel , Cihlář Jaroslav
Published: March 2012

Alumina and both tetragonal and cubic zirconia based composites with various volume fractions of constituents as well as with addition of carbon nanofibers were prepared by EPD. Mechanical properties (hardness, Youngs modulus) were measured by depth sensing indentation methods and related to chemical composition. Tribological behavior was studied using pin-on-disc technique at room temperatures in air at dry sliding. Coefficient of friction and wear rates were measured, the types of wear regimes were observed and damage micromechanisms identified.
Fly Ash/Rare Earth Oxide Coatings by EPD: Processing and Characterization
Authors: Arizmendi-Morquecho Ana , Chávez-Valdez Alejandra , Aguilar Josué , Álvarez Jaime
Published: March 2012

Novel materials that can be used as thermal barrier coatings in high temperature applications were obtained by homogenization, mechanical milling and thermal treatment. Samarium oxide was investigated as an alternative to react with the free silica from fly ash and to form new silicate compounds. The main phases found in fly ash-Sm2O3 mixtures were mullite and samarium silicate Sm4.66O(SiO4)3. Electrophoretically deposited coatings from these materials were obtained at 50 V and 3 minutes deposition time. The surface microstructure of the coatings was characterized by scanning electron microscopy (SEM-EDXS). The coatings were homogeneous and showed no crack formation. Additionally, thermal conductivity of the bulk samples at room temperature was determined. The thermal conductivity values of the new materials were below 1 W/mK which makes them suitable for thermal and environmental barrier applications.