bluuebunny/crossref_metadata_2025 huggingface dataset:
Development on Preparation of Mullite and its Composites from Fly Ash
Authors: Ma Bei Yue , Sun Ming Gang , Yan Chen , Ding Yu Shi , Li Ying
Published: February 2012

The latest development on preparation of mullite, mullite-corundum and mullite-zirconia materials using fly ash by reaction sintering process was reviewed. The future development of mullite and its composites synthesized from fly ash was prospected.
MnO Powder as Anode Material for Lithium Ion Battery
Authors: Zheng Ming Sen , Zang Jun , Dong Quan Feng
Published: February 2012

MnO powder was synthesized by a facile pyrolysis method using Mn(Ac)2•4H2O powder as the starting material at 800°C for 3h under nitrogen atmosphere. The morphology and structure character of MnO powder was studied by Field-emission scanning electron microscopy (SEM) and X-ray Diffraction. The electrochemical performance of the product was evaluated by galvanostatic charge/discharge experiment. The results shows that MnO powder can deliver a capacity of 604mAh/g at current density of 0.1C, and a capacity retention of 88% is acquired after 150 cycles at 1C rate.
Influence of Snowy Pavement on Driver’s Characteristics of Fixation and Saccade
Authors: Wu Li Xin , Cheng Guo Zhu
Published: February 2012

For driving safety on snowy pavement, it is necessary to study on the influence of snowy pavement on driver’s visual characteristics. Based on reasonable partition of driver’s visual field, the data of the number of driver’s fixation and fixation time were surveyed. And driver’s characteristics of fixation were compared on good pavement and snowy pavement. Based on the data of driver’s saccade distance and speed, driver’s characteristics of saccade were compared on good and snowy pavement. It shows that snowy pavement make drivers’ visual field become narrow and it is easy to cause drivers’ visual fatigue which is adverse to driving safety.
The Fast Diagonal-Matrix-Weight IMM Algorithm for Target Tracking
Authors: Fu Yang , Wei Ming , Zhang Hai Chuan , Gao Liang
Published: February 2012

The diagonal-matrix-weight IMM (DIMM) algorithm can solve the IMM algorithm confusions of probability density functions (PDFs) and probability masses of stochastic process. Combingandfilter，the Fast-IMM algorithm has a better performance both in accuracy and reducing computational complexity. In order to improve the estimation accuracy and computational complexity，we apply Fast-IMM method to DIMM algorithm. Therefore，A new method, Fast diagonal-matrix-weight IMM (fast-DIMM) algorithm, is proposed in this paper to heighten the real-time application of DIMM algorithm. Simulations indicate that the proposed fast-DIMM algorithm is a competitive alternative algorithm to the IMM algorithm in real time application
Failure Analysis of Early Fracture for Diesel Engine Cylinder Liner
Authors: Gu Jun , Xu Yuan Qiang , Zhou Jing Jing
Published: February 2012

This article, through the cylinder jacket break phenomenon which occurs to the diesel engine early time carries on the failure analysis, suggests that the cylinder jacket material ingredient control is lax, causes the cylinder jacket material brittleness to be oversized, the tool escape acute angle is the cylinder jacket break primary cause, and proposes corresponding regulatory measures prevent the cylinder jacket early tithe break.
Dynamic Characterastics of Beam Structures with Attachments
Authors: Cheng Gang , Wang Wei Dong , Cheng Quan
Published: February 2012

Beam structures are commonly found in the fields of engineering. Since in practical cases the subsystems are attached with respect to beams due to the need of the engineering, and the concentrated masses are only an approximation to the reality. This paper considers the dynamic characterastics of the Euler-Bernoulli beam with Attachments. The beam is supported elastically by transverse and torsional springs. The present study is concerned with the dynamic characterastics of the beam structures with arbitrary number of the elastically mounted masses at arbitrary positions by utilizing the method basing on the theory of integral equation and the theory of generalized function. The results are presented for the natural frequencies of the beam structures with the concentrated mass and oscillators. To verify the validity and accuracy of the present method, the experimental results are obtained utilizing the method of spectral analysis. These results provide a better understanding of the problem described and may be of interest to experimentalists and design engineers
Single-Primary-Winding Current-Fed Multiple-Input Full-Bridge Converter
Authors: Wang Qin , Cheng Mu Yu , Xiao Lan , Wang Lei
Published: February 2012

This paper proposes the topological generated method, control method and circuit feature of the single primary winding current-fed full-bridge MIC. The MIC has only one primary winding. Compared with the traditional multiple primary winding current-fed MIC, it has simpler structure, more flexible control and can power the load simultaneously or individually. The Pulsating Current Source Cell in the converter is Boost type. The input current is continuous and it can prolong the usage age of PV cell and fuel cell. The single primary winding current-fed double-input full-bridge converter based on Boost converter is taken as an example to analyze its operation principle, control strategy. Simulation results are presented to verify the theoretical analysis
Modeling and Simulation of the Servo Mechanical System Based on Matlab
Authors: Li Ding Zhen , Zhang Li Na
Published: February 2012

It was considered the radar multi-level gear of the servo-mechanical system as a single stage by a combination of gear mesh unit and established a single stage gear meshing element model. It selected the transmission system parameters of the mechanical properties and established a servo-mechanical transmission system dynamic model. The simulation research was done by using Matlab. The results proved that the model of radar servo mechanical system was right. At the same time, it analyzed the effect of the nonlinear backlash factors on system performance.
Feasibility Analysis of Applying Thermal Insulation Composite Wall in Residential Buildings
Authors: Hu Xiao Jun , Wang Yue
Published: February 2012

From the perspective of existing rules for energy conservation and fire-prevention, as well as safety, the traditional technology of external and internal thermal insulation of outer wall is becoming more and more inadaptable to requirements for outer wall thermal insulation of residential buildings. The paper is seeking for a system of outer wall thermal insulation technology suitable for residential buildings by analysis of physical mechanics performance and construction process of thermal insulation composite wall.
Design and Simulation on High Speed FFT Processor in Radar Signal Processing
Authors: Li Shun Xin , Mo Yu Fan
Published: February 2012

Based on the high-speed, real-time and high precision of radar signal processing, FFT arithmetic is utilized in the radar signal processing and FFT processor is designed and implemented. The proposed processor adopts radix-2 FFT algorithm. FFT computing based on FPGA has the advantages of high speed, less resource occupancy, easy algorithm and convenient system debugging and implementation. It is composed employing VHDL as hardware description language, FPGA as the logic controller, Quartus II as designing and synthesis simulation tool. The simulation results indicated FFT processor approached the request of the radar signal processing and it is suitable for the application of high-speed signal processing
The Research and Development of Engineering Project Based on the Building Information Mode
Authors: Guo Bing , Pan Lin
Published: February 2012

The paper has also compared the traditional engineering project management information management (PMIS) with the new system based on BIM and under the B/S overhead construction PMIS and has given the fit and unfit quality. In the end, the paper gives some useful suggestions on the questions during the PMIS design process which should be pay great attention to.
Flow and Heat Transfer Characteristics of Urban Original Sewage
Authors: Zhang Cheng Hu , Du Qing Ting , Sun De Xing
Published: February 2012

This paper introduces rheological property, thermo physical property, flow resistance and heat transfer characteristic of urban original sewage and the calculation thinking and method.
Multirate-Based Fast Parallel Algorithm for 2-D DCT-Based Real-Valued Discrete Gabor Transform
Authors: Gu Juan Juan , Tao Liang
Published: February 2012

Novel and fast algorithm for the multirate and parallel implementation of the 2-D DCT-based real-valued discrete Gabor transform (RDGT) is presented. A 2-D multirate-based analysis filterbank is designed for the 2-D RDGT. Each of the parallel channels in the filterbank has a unified structure and can apply the 2-D fast discrete cosine transform (DCT) algorithm to reduce its computational load. The computational complexity of each parallel channel is very low and is independent of the oversampling rate. All the RDGT coefficients are computed in parallel during the analysis process. Thus, the proposed parallel algorithm is attractive for real time image processing.
Application of Chlorine Dioxide in Drinking Water Disinfection
Authors: Jiang Deng Ling , Chen Bo Wen , Ni Guo Wei
Published: February 2012

Chlorine dioxide was applied to drinking water for reducing the quantity of organic pollutants such as chloroform and the taste and odor problems. A modified mode for operation in tap water plant was proposed following an investigation of the reaction mechanism by which ClO2 reacts with aquatic organic materials. By using such techniques, by-products such as chlorite and chlorate were effectively minimized and high quality drinking water was produced with reduced production cost of water treatment.
Vector Quantization Multi-User Scheduling in Broadcast Channel
Authors: Hang Juan , She Feng
Published: February 2012

This paper deals with the research on user scheduling algorithm in downlink MIMO systems with limited feedback of channel state information (CSI). In this paper, we use vector quantization to simplify the procedure of user selection. By quantizing MIMO channel into several un-overlapped channel regions, we can get semi-orthogonal region sets with predefined threshold. Then, based on the semi-orthogonal region sets, we present a low complexity user scheduling algorithm. Simulation results show that the achieved sum rate by the presented algorithm can achieve nearly optimal sum rate while with much lower complexity than that of the existing algorithms
The Analysis on Icons Design of Oriented System in the Architecture Cultural-Specific Contexts
Authors: Zhang Ye , Yi Xiao
Published: February 2012

Icons design of oriented system in the Architecture cultural-specific context will certainly become a research focus in the future. This study puts oriented symbolic system into thinking in located spatial context, taking the icons in prohibiting, warning and interpreting system as the cutting point, and applies relevant theories of design semantics and design rectories to study on some European successful cases. Through analyzing on the symbolic design thinking process of each representative case, we try to find the internal logic relationship between symbols and how does these symbols connect with their located contexts. Finally, this paper summarizes and puts forward some effective design techniques on the basis of design semantics.
Study on Tdsorption of Heavy Metalion in Metallurgical Wastewater by Montmorillonite
Authors: Zhou Xiu Yan , Xue Xiang Xin , Zhao Yu Hua , Liu Ou
Published: February 2012

In this study, the sorption of single heavy metal (Cu2+, Pb2+ and Zn2+) and multiple heavy metals in simulated metallurgical wastewater by montmorillonite was investigated. The effect of adsorption time and temperature conditions, etc. on the adsorption was also studied. The results showed that in the same concentration of adsorbent dosage, removal rate of single heavy metal is the highest (99.9%, 88.1% and 98.3%) when the concentration of Cu2+, Pb2+ and Zn2+ is 50 mg/L, 20mg/L and 100mg/L, respectively. The adsorption of multiple heavy metals in simulated metallurgical wastewater is the highest in 4 hours at 20°C. The adsorption capacity is in order of Pb2+≈Zn2+>Cu2+>Cd2+ and removal rate is 90.8%, 87.3%, 70.0% and 51.6%, respectively.
Analysis and Suggestions on Free Allocation with Preferential Policy for Initial Emission Permits
Authors: Rao Cong Jun
Published: February 2012

This paper studies the validity evaluation problem of free allocation with preferential policy for initial emission permits (IEP), and establishes a validity evaluation model to evaluate the validity level for the free allocation of IEP based on the uniform price auction mechanism and model. Concretely, the definition of validity for the free allocation is presented, and the evaluation criterion and the evaluation process are given. Moreover, this evaluation model is applied to evaluate the validity level for the chemical oxygen demand (COD) in 14 counties and cities of Han River. Based on the evaluation results, several conclusions and suggestions are given on the pollutant discharging declare, environmental policy and free allocation method.
Pile-Soil Interaction Numerical Simulation Analysis of the Surface to Surface Contact Elements
Authors: Lei Qing Guan , Dai Qin Jie , Wang Jian Guo
Published: February 2012

Based on the experimental data in the literature, contact elements were used in the pile-soil interface and the pile-soil interaction was simulated by ANSYS in this paper. Compared with theoretical analysis of the literature, the effects of pile-soil interface on the mechanical parameters of contact elements under the pile-soil vertical load and soil physical parameters were obtained by ANSYS simulation. The results can be a guiding on the reasonable choice of parameters under complex loads.
Numerical Simulation on Tensile Fracture Process of Multi-Crack Rock Bridge
Authors: Wang Lai Gui , Gu Xin Rui , Wei Feng
Published: February 2012

In order to study the tensile failure of rock bridge, the finite element software which can simulate the cracking of pull and tensile stress was used to simulate the tensile failure process of rock bridge with multi-crack. The general finite element software can only simulation continuous medium, in this paper we succeeded in discontinuous problem with this finite element software. Reach a conclusion of the rupture results of rock bridge in rock mass with multi-crack under the conditions of uniaxial compression, and the law of the stress distribution in the process of destruction.
Prediction of tRNA Based on LS-SVM Algorithm with Principal Component Analysis
Authors: Xing Chong , Wang Yao , Zhou You , Liang Yan Chun
Published: February 2012

Recently, non-coding RNA prediction is the one of the most important researches in bioinformatics. In this paper, on the basis of principal component analysis, we present a tRNA prediction strategy by using least squares support vector machine (LS-SVM). Appearance frequencies of single nucleotide, 2 – nucleotides and (G-C) %, (A-T) % were chosen as characteristics inputs. Results from tests showed that the prediction accuracy was 90.51% on prokaryotic tRNA dataset. Experimental results indicate that the method is effective for prokaryotic ncRNA prediction.
Research on Re-Vegetation in Mining Wasteland of Baoshan Mine
Authors: Cui Li Li
Published: February 2012

Abstract. This paper analyzing the tendency of plant community succession and the factors that affecting the plant succession through researching on the plant species, frequency, coverage and multi- frequency in mining wasteland of Baoshan mine. The possibilities of vegetation restoration are investigated in mining wasteland of Baoshan mine.
Application of Support Vector Machine in Determination of Real Estate Price
Authors: Zhang Shi Hu
Published: February 2012

The problem of real estate prices are the current focus of the community's concern. Support Vector Machine is a new machine learning algorithm, as its excellent performance of the study, and in small samples to identify many ways, and so has its unique advantages, is now used in many areas. Determination of real estate price is a complicated problem due to its non-linearity and the small quantity of training data. In this study, support vector machine (SVM) is proposed to forecast the price of real estate price in China. The experimental results indicate that the SVM method can achieve greater accuracy than grey model, artificial neural network under the circumstance of small training data. It was also found that the predictive ability of the SVM outperformed those of some traditional pattern recognition methods for the data set used here.
The Traits of Nontensor Five-Variant Wavelet Packs and Applications in Management Science and Materials Science
Authors: Zhang Qing Ge
Published: February 2012

Materials science is an interdisciplinary field applying the properties of matter to various areas of science and engineering. In this article, the notion of orthogonal nonseparable five-variant wavelet packages is presented. A novel approach for constructing them is presented by iteration method and functional analysis method. A feasible approach for constructing two-directional orthogonal wavelet packs is developed. The orthogonality property of five-variant wavelet packs is discussed. Three orthogonality formulas concerning these wavelet packs are estabished. A constructive method for affine frames of is proposed. The sufficient condition for the existence of a class of affine pseudoframes with filter banks is obtained by virtue of a generalized multiresolution analysis.
Design of Automated Guided Vehicle for Field Application
Authors: Li Yong Kui , Chen Li Jun , Bai Xue Wei
Published: February 2012

A type of GPS-navigation wheel testing vehicle was designed for operating in field environment. The commonly used material and standardized parts were selected to construct mechanical system; and the general electronic component as well as personal computer was used to construct the control system. The experiment conducted with the testing vehicle shows that the vehicle has sufficient capacity for ordinary loading, meanwhile it runs smoothly and of good maneuverability. It provides a practical platform for studying GPS-navigation technique applied on agricultural machines in field working condition
A New Method for Calculating the Copper Coverage of PCB
Authors: Jiang Min , Gao Cheng , Huang Jiao Ying , Fu Gui Cui , Cheng Ying
Published: February 2012

This paper introduces a new method to obtain the copper coverage of PCB. Board-level simulation is very important in the thermal analysis and reliability design of electronic equipment. While in the process of PCB modeling, it is difficult to obtain the coverage percentage of copper in the PCB layer. By this method, the calculation of the coverage is converted to MATLAB image processing problems, is more simple than the traditional methods and the precision is higher, with strong practical.
The Analysis of Motion and Strength for the Clamping Mechanism of Die-Casting Machine Weighing 4500 Ton
Authors: Ma Hai Kuan , Zhao Sheng Dun , Zhang Qi , Xie Jia
Published: February 2012

The clamping mechanism motion condition of die-casting machine is very important to the whole die-casting machine. In order to analyze the relationship between the output force of clamping mechanism and displacement of hydraulic cylinder, the whole clamping mechanism model is established. By the software ADAMS (Automatic Dynamic Analysis of Mechanical System) simulation, the all kinds of characteristics are got. Through the comparison, the best displacement by the output force is derived. In the end, on the basis of the result of the analysis, the stress condition of clamping mechanism confirms the rationality.
The Reverse Design and Injection Molding Analysis of Plastic Product Based on Imageware and Moldflow
Authors: Tan Heng , Wang Ze , Dai Guo Hong
Published: February 2012

The process and method of reengineering design are introduced in the paper. Using the reverse engineering Imageware software, the helmet points cloud data were processed， the characteristic curve net was divided and the curve surface was reconstructed. Then the 3D model of the helmet established with Imageware was input in Moldflow. With the help of Moldflow simulating analysis software, injection molding is simulated and analyzed by calculated for helmet. According to the result of analyze fill, cool and warp, the structure of mould is optimized and designed and high quality product is obtained. The fast design for product and mold is realized.
Simulated Annealing Algorithm Application on Inverting Optical Constants of Thin Films
Authors: Shang Xiao Yan , Han Jun , Zhang Jian Feng
Published: February 2012

In thin-film thickness wideband monitoring system,in order to eliminate error accumulation effect of layers which have been deposited on layer which will be deposited, the thin-film optical constants of layers deposited must be achieved.Utilizing transmittance spectral curve which has been measured, Simulated Annealing Algorithm is applied on inversion of optical constants n,k,d.For the purpose of increasing optimization speed and algorithm efficiency,the algorithm is improved, exponent dropping temperature rate varies with acceptance probability P ;The finding range of new value is controlled adaptively according to acceptance rate when the dropping temperature is t,then the algorithm is applied on the example that is membrane ZnS is deposited on the substrate of quartz glass , n,k,d are obtained in a shorter time by optimization and their values are satisfying.
Effect of Mn Doping on Optical Properties of Nanostructured ZnO Thin Film
Authors: Abrishami M. Ebrahimizadeh , Kompany A.
Published: February 2012

Undoped and ZnO: Mn thin films with different Mn content ( 5, 10 and 15 mol%) were grown on glass substrates by spray pyrolysis technique. X-ray diffraction analysis showed that single phase wurtzite structure is formed in all samples. XRD results also indicated that the undoped ZnO were crystallized in c-axis oriented wurtzite structure, while the ZnO: Mn thin films were polycrystalline. The SEM results revealed that Mn presence were modified the surface morphology of the samples. The optical transmittance measurements were performed in the wavelength range from 190 to 1100 nm. The refractive index, extinction coefficient and film thickness were determined by using pointwise unconstrained minimization model. It was observed that the refractive index increased with the increase in Mn concentration. Also, the thin films exhibited the direct band gap increased from 3.20 to 3.28 eV with the increase in Mn content. The optical dispersion parameters have been calculated and analyzed by using Wemple-Di Domenico relation. The obtained values showed that dispersion energy Ed of doped samples was found to be decreasing comparing to undoped thin film.
Research on Key Technologies and Development of Three-Dimensional Demonstration Platform for Oil Spill Response Simulation in the Three Gorges Reservoir Area
Authors: Chen Shu Zhe , Huang Li Wen
Published: February 2012

Three-dimensional demonstration platform for oil spill response simulation in the Three Gorges reservoir area established the oil spill response three-dimensional displaying system including the two-dimensional GIS platform on the basis of environmental dynamic prediction model, oil spill model, GIS and virtual reality technology. The platform for oil spill response simulation in the Three Gorges reservoir area development process and put study emphases on the key technologies. It can provide decision-making basis for pollution emergency disposal in the Three Gorges reservoir area. It also has important significance to improve the level of water environment pollution prediction.
The Theoretical Research of the Piezoelectric Fluid Spinning Top
Authors: Yu Quan Gang , Piao Lin Hua , Wang Xing
Published: February 2012

In this paper, a mathematical model of the piezoelectric fluidic angular rate sensor is created. At first, starting from the Coriolis acceleration, obtain a comparison expression for the angular rate and the flow velocity. At second, according to the heat balance theory, solve a comparison expression for the thermal resistance wire current and flow velocity under the forced convection heat transfer condition. At last, obtain a comparison expression for the angular rate and the thermal resistance wire current. Thus a mathematical model of the piezoelectric fluidic angular rate sensor is created. Experiments prove that the average deviation between theoretical and experimental values is less than 10%.
Study on the Flow Characteristics of the Monolithic Muffler in Train Air Conditioning Duct
Authors: Li Xu Quan , Dong Dong Dong , Gu Min Jie , Wang Gang , Hu Song Tao
Published: February 2012

After installing the monolithic muffler in the train air duct, noise is reduced, but meanwhile also increased the air duct resistance. In this paper, a monolithic muffler simulation calculation model is introduced in this paper. The pressure loss and internal flow field of the muffler are obtained by. CFD simulation. Experimental results validate the simulation method. It provides a basis for the silencer performance research of muffler.
Testing Research of Slurry Water Concentration Based on Natural Gamma-Ray Attenuation Method
Authors: Zhang Cheng Lian , Xia Yu Ming , Zhang Chen , Tu Ya Nan , Wang Lei
Published: February 2012

The slurry water concentration measurement device based on the natural gamma-rays attenuation method was designed in this paper; this natural gamma-ray is taken from a special kind of sand beach, which contains thorium. A number of experiments were made in the laboratory. The natural gamma-rays attenuation rules were obtained when it passing through the different concentration of the slurry water. The attenuation rules of natural gamma-ray passing through different concentration of slurry water were proved in theory and in tests. This provides reliable criterion for design of slurry water concentration detector.
Design of Intelligent Automatic Annular Three-Dimensional Garage System Based on Micro Control Unit
Authors: Feng Yan Sen , Hou Rong Guo , Niu Rui Xiang , Wang Xue Min , Zhang Zhong Liang
Published: February 2012

For purpose of maximum using land utilization and minimum the cost of the parking equipment, a intelligent automatic annular three-dimensional garage system is designed, the major characters of it are multifunction, intelligence and highly automatic, which are obtained by using annular form as the frame structure and micro control unit as the cybernetics core. By using this equipment, the parking labor intensity is relieved; the environment pollution is also controlled
Research on Dynamic Threshold Based Energy Detection in Cognitive Radio Systems
Authors: Yu Gui Cai , Long Cheng Zhi , Xiang Man Tian
Published: February 2012

In cognitive radio networks, nodes should have the capability to decide whether a signal from a primary transmitter is locally present or not in a certain spectrum within a short detection period. Traditional spectrum sensing schemes based on fixed threshold are sensitive to noise uncertainty, a fractional fluctuate of average noise power in a short time can lead the performance of spectrum detection drop seriously. This paper presents a new spectrum detection algorithm based on dynamic threshold. Theoretical results show that the proposed scheme debate the noise uncertainty, and good detection performance can be gained, if suitable dynamic threshold is chosen. In other words, the proposed scheme can enhance the robustness against noise and improve the capacity of spectrum sensing.
Study Infrared Radiation Characteristic on High-Speed Projectile
Authors: Lu Li Ping , Li Han Shan , Shang Xiao Yan
Published: February 2012

To improve the detection performance of dynamic object tracking system that cannot work normally at night, the infrared detection technology is put forward to design and study its detection tracking system. According to the characteristic that projectile can produce heat radiant energy when it flying, the surface projectile was divided into small unit area independently to calculate its infrared radiation energy, its heat radiation temperature equations were established, the method of four-order runge-kuta was applied to analyze and calculate temperature parameter. The relation between atmospheric attenuation and detection performance was analyzed in dynamic object tracking system. Through calculating and analyzing, the theory of infrared radiation technology meets the need of dynamic object tracking system.
The Design and Development of Underground Ore Grade Automatic Measurement System
Authors: Wang Hong Tao , Bi Ke Ming
Published: February 2012

This paper introduces a kind of grade detection system of underground iron ore. The system uses the technology of multi-threaded parallel processing of sensor to measure the volume and weight of the ore. Based on a certain mathematical model of grade analysis we have built, the average grade of the ore can be calculated. The trial run of the system indicates that the data of ore’s weight, volume and grade can be stored and counted automatically. What’s more, the system achieves non-stop measurement of ore’s grade.
Measurement Research of Pipe Automatic Welding Bug Speed
Authors: Zhang Li Xin , Ji Wen Gang , Li Tie Xiang
Published: February 2012

Walking speed of pipe automatic welding bug influences directly the quality of pipe welding. Measurement of walking speed of pipe automatic welding bug is very necessary. Direct measurement of walking speed of pipe automatic welding bug has the certain difficulty. Indirect measurement of walking speed of pipe automatic welding bug is realized by angle transducer installed in pipe automatic welding bug. Measuring precision of walking speed of pipe automatic welding bug is influenced by angle signal sampling frequency , angle resolution of angle transducer, walking speed of pipe automatic welding bug, the resolution of the AD converter and so on. The method of subsection of speed is adapted to measure indirectly walking speed of pipe automatic welding bug . Its effect is well.
Simulation Study of PFC Boost Converter Based on Predicted Average Current Control
Authors: Ye Man Yuan , Li Song
Published: February 2012

Introduced to predict average current control PFC Boost converter structure, and analyzes its operating principle, the average current control strategies equation is given by derivation. And a model of predict average current control PFC Boost converter is gained using Matlab Simulink simulation software and SimPowerSystems toolbox. Simulation results show that the predicted average current control PFC Boost converter with control circuit is simple and reliable, high input power factor, anti-interference ability, current harmonic distortion, etc, and is forecast to average voltage control strategy for the active power factor correction provides a novel, simple and feasible control methods.
Decentralized Information Flow Controlled Method Based on Trusted Pipe
Authors: Chen Ya Sha , Jiang Wei , Hu Jun , Liao Jian Hua
Published: February 2012

To solve the problems derived from isolation of application security mechanism and operation system security mechanism, firstly we propose the concept of trusted pipe, which can be used to achieve a uniform security mechanism, and then formally describe the information flow control method in the Communicating Sequential Processes（CSP）. Finally we prove that the model fits a standard definition of non-interference.
Analysis of 3D Stator Temperature Field in High Voltage and High Power PMSM
Authors: Qu Feng Bo , Li Wei Li , Chen Ting Ting , Li Zhi Peng
Published: February 2012

Taking a 315kW, 6kV permanent magnet synchronous motor (PMSM) with solid rotor as an example, the physical and mathematical models of PMSM three dimensional temperature fields analysis are established according to the heat transfer principles. The basic hypothesis and boundary value problems of the solving region in the motor are also presented. The 3-D temperature field in stator of PMSM was calculated, and the influences of heat transfer coefficients with consideration of the axial wind or not on stator temperature were analyzed. By comparing the test results with the calculated results, the influences of axial wind on motor temperature were investigated. These conclusions provide a reference for thermal design of the motor with co-axial fan and enclosure cooling fan.
Research of On-Line Configuration for Power Monitored Control System
Authors: Zhou Qin , Fu Zheng Cai , Zhou Bo
Published: February 2012

In order to adapt the developing requirements of upgrade reconstruct, expansion, renewal of device, function performance improvement, aiming at the characteristic of power network decentralization and fast distance, putting forward a structure scheme for implementing on-line configuration, based on the OOD( Object-Oriented Design) and modifying the relation of node link. It is described in this paper including system structure, software compose and realization principle. That scheme has some characteristics with better practicability, universal applicability, transplantability and easy-using.
Direct Torque Control Methods of EMU during All Speed Range
Authors: Wang Na , Cui Heng Bin , Feng Xiao Yun
Published: February 2012

This paper theoretically analyzes the principle of the direct torque control method, then builds the direct torque control scheme of electric multiple-units(EMU) running during all speed range: indirect torque control in low velocity zone, eighteen polygon flux control method in moderate velocity zone and weakening hexagonal flux control strategy in high velocity zone. Simulation results show that the EMU direct torque control strategy in all speed range is feasible, and the system has good dynamic and static performance. All of the researches are available in the EMU controller research.
Optimization of the Neural Network by Using the LabVIEW Instrumentation
Authors: Olaru Adrian , Olaru Serban , Paune Dan , Aurel Oprean
Published: February 2012

The paper shown one assisted method to construct simple and complex neural network and to simulate on-line them. By on-line simulation of some more important neural simple and complex network is possible to know what will be the influences of all network parameters like the input data, weight, biases matrix, sensitive functions, closed loops and delay of time. There are shown some important neurons type, transfer functions, weights and biases of neurons, and some complex layers with different type of neurons. By using the proper virtual LabVIEW instrumentation in on-line using, were established some influences of the network parameters to the number of iterations before canceled the mean square error to the target. Numerical simulation used the proper teaching law and proper virtual instrumentation. In the optimization step of the research on used the minimization of the error function between the output and the target.
Analysis & Modelling Options of Elastic Actuators for New Robotics Uses
Authors: Dolga Valer , Dolga Lia
Published: February 2012

Nowadays, robotics focused towards an interdisciplinary cooperation with other scientific fields, with the main goal of submitting solutions to improve the human life quality. This new orientation required the development of subsystems that differ from the common robotic components and match the new applications requisites. One of these preoccupations envisages the analysis and design of high performance actuators. The paper deals in this way with specific aspects characterizing the analysis and modelling of actuators with a serial elastic element.
Risk Priority Analysis for Engine Based on Fuzzy Weighted Geometric Mean
Authors: Gu Ying Kui , Luo Xin Chong , Tang Shun Yun
Published: February 2012

Fuzzy risk priority numbers (FRPNs) were proposed for assessment of the probabilistic risk by synthetically using fuzzy set theory, failure mode and effect analysis. The priority rank of failure modes is evaluated by fuzzy risk priority number in the fuzzy failure mode and effect analysis, where occurrence probability ranking, effect severity ranking and detection difficulty ranking are all fuzzy weighted geometric mean, and the FRPN can be computed using alpha-level set and optimization model. An engine example was provided to illustrate the proposed fuzzy FMEA and the detailed computational process of the FRPNs.
Aspects Regarding the Disc Brake's Thermal Stress Simulation by Using Infrared Thermography
Authors: Spulber Catalin , Voloacă Ştefan
Published: February 2012

The paper proposes a new simulation method of a brake disc thermal stress resistance, for different temperatures, by interactive processing of images obtained by thermography. Temperature evaluation for different working regimes can be made by recording and processing thermograms of a brake disc heated inside the laboratory by an external heating source. Taken pictures along the temperature variation, from the ambient value to a value close to real one obtained on the usual experiments, are processed using image analyse software. This way can be simulated different working regimes (temperature, humidity etc.) without the need of experimental determination on the road or on a test bench.
Analog Computation of Forms of Uranium Presence in Aqueous Solution
Authors: Lei Jie Hong
Published: February 2012

In geological disposal of radioactive wastes, the study of uranium migration is very important for the safety evaluation of the repository. The forms of chemical components of uranium presence in aqueous solution that directly affect its migration behavior provide a basis for analog computation of the element. This paper uses PHREEQC, the geochemical model, for analog computation of forms of uranium presence in two types of groundwater, and analyzes the morphologies of the main elements and the influencing factors. The results show that the morphology of uranium is mainly controlled by the characteristics of the chemical composition of groundwater, while the PH value also has a great impact on the forms of uranium presence.
Design and Modeling of a Ball Wheel Mobile Robot
Authors: Ghariblu Hashem , Moharrami Ali , Ghalamchi Behnam
Published: February 2012

A new generation for an omni-directional ball wheel mobile robot with unique driving mechanism is introduced. This driving system overcomes to problems arise using traditional omni-wheels such as, vibration, inappropriate to employ in outdoor applications and limited load capacity. Mechanical structure of this robot has several distinctive characteristics in comparison with our previous robot. Modularity of driving system is the most important ability of new robot, beside on appending a suspension system to improve behavior of robot in rough terrains. Due to independent operation of three ball wheel chassis, designed robot has high performance in going over obstacles along its path.
Designing Arms and Hands for the Humanoid Robot ROMAN
Authors: Hirth J. , Berns K. , Mianowski K.
Published: February 2012

The interest in assistance and personal robots is constantly growing. Therefore robots need new, sophisticated interaction abilities. Psychologists point out that most of the human-human interaction is conducted nonverbally. For that reason, researchers try to enable humanoid robots to realize nonverbal communication signals. This paper presents a compact, lightweight, and low-cost arm and hand design to enable humanoid robots to use gestures as nonverbal interaction signals.
Mechanical Design and Control Issues of a Dexterous Robotic Hand
Authors: Berceanu Cosmin , Tarniţă Daniela
Published: February 2012

The design and control problems involved in the development process of robotic grippers have been active research topics in the last three decades. In this paper it is presented a new developed dexterous robotic hand whose mechanical structure is based on a biomechatronic approach. The control system for this artificial hand relies on modern software and hardware components which allow precise positioning of the fingers.
Stealth Target Location Algorithm for Low Altitude Based on Microwave Radiometer
Authors: Liu Li Nan , Zhao Xiao Meng , Huang Tao , Yang Bin
Published: February 2012

Based on the microwave radiometer for goals positioning the least-square method to basically have two kinds: using linear approximation, but positioning accuracy is lower; Or by using nonlinear approximate such as Newton iterative method, but need to consider iterative convergence and computation problem. Based on this situation, a new data fusion approach is given. This method for taking two vessels measurement use linear least squares to the fair, then introduced one kind of weighting operation to carry on the fusion to two vessels rendezvous result, get multiple-vessel localization model and the error analysis. The simulation result indicate that the new algorithm increase the localization precision, enhance the positioning stability.
Efficient Heat Dissipation Design of High-Power Multi-Chip Cob Package Led Modules
Authors: Wu Lei , Xiong Xiao Yun , Wang De Xing
Published: February 2012

In this study, the junction temperature (Tj) and thermal resistance (Rth) of five high-power multi-chip COB (chip-on-board) LED packages with different chip spacings were compared. The actual Tj was measured by an IR camera and compared with the simulation results from a computational fluid dynamics (CFD) software. In addition, the effects of heat slugs with different thermal conductivity, heat sinks of various thicknesses, chip size, and forced convection cooling on the Tj and Rth of high-powered LED components were investigated. The experimental results show that smaller chip spacing resulted in higher Tj and Rth. The heat dissipation performance can be improved by using a heat slug with a high thermal conductivity; and increasing the thickness of the heat sink, or employing forced convection cooling.
Photoacoustic Imaging Based on Limited-Aperture of Transducer
Authors: Rong Jian , Lu Kui , Zhong Xiao Chun , Chen Bing Zhang , Liu Li Xin , Huang Lin
Published: February 2012

The influence of the aperture of transducer on the photoacoustic imaging was analyzed in this paper. We used different lengths of the same absorber for experiments, and these results demonstrated that the signal intensity would become stronger with the increasing of length of the absorber. But it will remain the same when its length over a certain value.
Structural and Electronic Properties of Pt3 and Pt3M Clusters (M=Au, Ag, Sn, Fe)
Authors: Li Dong Mei
Published: February 2012

With density functional theory, the structural and electronic properties of Pt3 and Pt3M clusters (M=Au, Ag, Sn, Fe) have been studied. It is found that all the Pt3M clusters show planar and tetrahedral structures and their Pt-Pt bond lengths are larger than the bond lengths of Pt3. The effect of M doping on electronic properties of Pt3 clusters have been investigated. It is found that by adding one M atom, energy gaps of the corresponding clusters become smaller. The calculated results also indicate that M atom makes the highest energy level of Pt atoms shift highly, except for tetrahedral Pt3Au clusters. These may be good for analyzing adsorption problems
Mechanisms of 1D Crystal Growth in Chemical Vapor Deposition: ZnO Nanowires
Authors: Li Xin Yu
Published: February 2012

Abstract. ZnO nanowires synthesis throught oxidative evaporation of pure zinc powder without catalyst is studied in detail to understand the nucleation and growth mechanisms involved with the so-called “self-catalysis” schemes. The structural features associated with different growth stages were monitored using scanning electron microscopy (SEM), describe the direct observation of the nucleation and growth process. X-ray diffraction (XRD) and energy-dispersive X-ray spectroscopy (EDS) demonstrate that the as-obtained sample can be indexed to high crystallinity with wurtzite structure and only contain Zn and O without the presence of any impurities.
Synthesis of Na0.5Bi0.5TiO3 Microcubes via a Cr3+-Assisted Hydrothermal Route
Authors: Yang Lin Lin , Wang Yong Gang , Wang Yu Jiang
Published: February 2012

Na0.5Bi0.5TiO3 microcubes with the side size ca. 20-30um were successfully fabricated by a Cr3+-assisted hydrothermal method. The obtained samples were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Results show that Cr3+ played a significant role in the formation of Na0.5Bi0.5TiO3 microcubes. Possible mechanisms for the growth of Na0.5Bi0.5TiO3 microcubes are discussed. The results presented in this study would be important in investigating the correlation between morphology and basic physical properties, and may offer a route to control the morphology and size of crystals.
Stability Analysis of an Aeroelastic System with Actuator Saturation
Authors: Stoica Adrian Mihail , Stoia-Djeska Marius , Stroe Gabriela
Published: February 2012

Aeroelastic problems of light weight structures of modern aerospace vehicles are the result of interactions between aerodynamics, structural and inertial forces. The mathematical model of the aeroelastic problem is based on the Lagrange equations of motion for the structural dynamics and on a quasi-steady approach of the generalized unsteady incompressible aerodynamic forces. The oscillations of such aeroelastic system can be suppressed using linear active control techniques. In the case when the control is saturated the stability domain shrinks. The describing function method is used in this paper to determine the periodic solutions of an experimental aeroelastic system for two control laws.
Study of Circular Tapping Plates, with a Circumferential Vertical Load at the Interior Boundary by Transfer-Matrix Method
Authors: Suciu Mihaela
Published: February 2012

The work presents a calculus of the circular tapping plates, embedded at the exterior circumference, charged with a concentrated circumferential vertical load at the interior circumference, using the Transfer-Matrix Method. The approach is based of the theory of Dirac’s and Heaviside’s functions and operators. The circular plate’s calculus is important for a lot of industry domains, including the robotics too. We can obtain the two state vectors: for the first ring-the exterior circumferential element and for the latest ring-the interior circumferential element. We can calculate after, for the values r0<r<R, all the state vectors for all the rings of the circular tapping plate. With the Transfer-Matrix Method is very easy to program this calculus algorithm.
Design Consideration of Bio-Inspired Contractible Water-Jet Propulsor for Mini Autonomous Underwater Robot
Authors: Shaari Muhammad Farid , Zahurin Samad , Bakar Mohd Elmi Abu , Mariatti M.
Published: February 2012

The main aim of this paper is to discuss the general design considerations for contractible water-jet propulsion system for mini underwater robot locomotion. The motivation of this paper is the problems that occurred to the motorized turbine blade propeller for a lower than centimeter scale underwater robot. Contractile water-jet propulsion mechanism is proposed to counter the turbine blade problem. In this research, active materials had been proposed as the actuator for the contractile function. The integration of active material structure and passive structure caused significant consequence on the kinematic and dynamic of the robot. This including the dimension variation, stress distribution as well as contraction force which affects the hydrodynamic efficiency of the propulsion. Several essential design considerations were highlighted and discussed.