bluuebunny/crossref_metadata_2025 huggingface dataset:
Experimental Study on Odor Compass System Based on Gas Sensor Array and DSP Technology
Authors: Chen Li Wei , Yang Jian Hua , Tang Zhong Lin
Published: August 2011

Abstract. Based on metal oxide gas sensors and DSP technology an odor compass is designed in this paper. Odor compass estimates direction of point odor source by analyzing responses of sensors which are placed on different concentration gradient. Main structure consists of distributed metal oxide gas sensors and plexiglas material. Signal sampling and processing are accomplished by DSP system. The directivity of whole system is tested in uniform wind field. Experimental result shows that the responses for the odor sources with 30°disparity have obvious difference. Ratio of resistance response is selected as characteristic quantity. In this way, influence which is generated from individual difference of sensors is effectively eliminated.
Fault Diagnosis Technology for Power Electronics Rectifier Based on Wavelet Packet
Authors: Hu Qing , Wang Rong Jie , Lin Lian Shi
Published: August 2011

The paper presents on power electronics controlled rectifier faults diagnose technology based on the combination wavelet packet transformation and neural network mainly. By using the character of wavelet packet multiresolution, fault signal is decomposed at multi-scale, orthogonalation and normalization, extract feature vector, which as training input of neural network, and design classifier of fault pattern. The validity and feasibility of the fault diagnosis method is demonstrated by simulation. this method can quite accurately diagnosis fault and define fault element for power electronics controlled rectifier, and the diagnosis precision is high, the method has very good practical value and apply future on solving power electronics controlled rectifier fault diagnosis.
Continuum Analysis for Plate-Cone Spherical Reticulated Shell
Authors: Wang Fan
Published: August 2011

Plate-cone reticulated shell is a new type of space structures with good mechanical behavior and technical economy. In this paper, a continuum analysis method for plate-cone spherical reticulated shell which is equated to three layers thin shell is put forward. Based on mechanical characteristics of plate-cone spherical reticulated shell, the equivalent stiffness is derived through the theory of elasticity. Then, plate-cone spherical reticulated shell is equated to a special type of three layers thin shell working interactively, the governing differential equations are derived on the basis of the theory of thin shells, these differential equations being from the displacement method and the mixed method of derivation. The solution of this system of differential equations gives the displacements and internal forces of plate-cone spherical reticulated shell.
Urban Oversaturated Traffic Network Control Based on Preference Multi-Objective Compatible Optimization Control
Authors: Chen Juan , Yuan Chang Liang
Published: August 2011

To solve the traffic congestion control problem on oversaturated network, the total delay is classified into two parts: the feeding delay and the non-feeding delay, and the control problem is formulated as a conflicted multi-objective control problem. The simultaneous control of multiple objectives is different from single objective control in that there is no unique solution to multi-objective control problems(MOPs). Multi-objective control usually involves many conflicting and incompatible objectives, therefore, a set of optimal trade-off solutions known as the Pareto-optimal solutions is required. Based on this background, a modified compatible control algorithm(MOCC) hunting for suboptimal and feasible region as the control aim rather than precise optimal point is proposed in this paper to solve the conflicted oversaturated traffic network control problem. Since it is impossible to avoid the inaccurate system model and input disturbance, the controller of the proposed multi-objective compatible control strategy is designed based on feedback control structure. Besides, considering the difference between control problem and optimization problem, user's preference are incorporated into multi-objective compatible control algorithm to guide the search direction. The proposed preference based compatible optimization control algorithm(PMOCC) is used to solve the oversaturated traffic network control problem in a core area of eleven junctions under the simulation environment. It is proved that the proposed compatible optimization control algorithm can handle the oversaturated traffic network control problem effectively than the fixed time control method.
Modeling of Network Cooperative Design of a Hydraulic System Based on Multi-Agent
Authors: Feng Zhi Jun , Zhou De Jian , Shen Qi Fang , Chen Yan Hui
Published: August 2011

To shorten the design period of a hydraulic system and achieve distributed cooperative design by experts, this paper proposes a model of the network collaborative design of a hydraulic system based on multi-agent technology. This model consists of three layers: the management agent layer, the middle agent layer and the resource agent layer. Its agent of the same layer adopts distributed structure, and each autonomous agent is constituted of a group of lower subordinate agents. This structure meets the need of distributed control of the cooperative design. By dynamic data exchange of agents, it carries out their communication, coordination and conflict resolution, and finally gets the global target. From the developed example, a multi-agent system can easily integrate existing engineering design tools with analysis tools. Its concurrent design process can improve design efficiency.
Fuzzy Maximum Scatter Discriminant Analysis and its Application to Face Recognition
Authors: Feng Wan Li , Gao Shang Bing
Published: August 2011

In this paper, a reformative scatter difference discriminant criterion (SDDC) with fuzzy set theory is studied. The scatter difference between between-class and within-class as discriminant criterion is effective to overcome the singularity problem of the within-class scatter matrix due to small sample size problem occurred in classical Fisher discriminant analysis. However, the conventional SDDC assumes the same level of relevance of each sample to the corresponding class. So, a fuzzy maximum scatter difference analysis (FMSDA) algorithm is proposed, in which the fuzzy k-nearest neighbor (FKNN) is implemented to achieve the distribution information of original samples, and this information is utilized to redefine corresponding scatter matrices which are different to the conventional SDDC and effective to extract discriminative features from overlapping (outlier) samples. Experiments conducted on FERET face databases demonstrate the effectiveness of the proposed method.
Research on the Characteristics of Orifice Flow on Microfluidic Chips
Authors: Wang Wei , Liu Xiao Wei , Chen Shan Shan , Wang Xin , Li Shao Feng , Wu Yun Sen
Published: August 2011

The orifice which formed by the sudden change of channel’s scale on microfluidic chip and its application have introduced in this paper. The characteristics of orifice flow on microfluidic chip are studied by μ-PIV technology. The experimental PDMS chip is fabricated by hot press molding. The transient flow field experiment is carried out on the μ-PIV platform. The flow of thin-walled/thick-walled orifice was measured in experiment. There is flow constriction of orifice flow in jet state; the flow constriction of thick-walled orifice can pump the liquid in channel; and the critical Reynolds number of jet flow in microchannel structure is 190.
Micro Louvers for Micro and Nano-Satellites Thermal Control
Authors: Cao Sheng Zhu , Chen Xue Kang , Wu Gan , Yang Jian Ping , Wang Rui
Published: August 2011

Micro and Nano-satellites with their low thermal capacitance are vulnerable to rapid temperature fluctuations. Therefore, thermal control becomes more important, but the limitations on mass and electrical power require new approaches. Possible solutions to actively vary the heat rejection of the satellite in response to variations in the thermal load and environmental condition are the use of variable emissivity devices, such as micro louvers, micro thermal switches, etc. Micro louvers with small volume, low weight, less power consumption and large emissivity variation, will be the more suitable solution for micro and Nano-satellites thermal control. In this paper, a polyimide based micro louver is developed. The device structure was designed, the actuation voltage was analyzed theoretically and fabrication process was described. The main parameters were tested and results were presented.
A New Integrable Coupling of a Soliton Hierarchy
Authors: Guo Xiu Rong , Guo Mei , Liu Zheng Tao
Published: August 2011

With the help of the isospectral problem given by Li and Geng,a soliton hierarchy is obtained by use of the Tu Scheme.Finally,a type of new integrable coupling is produced by taking the 5-dimensional Lie algebra.
A Novel Heaving Buoy Wave Energy Converter
Authors: Cheng Chen , Shang Jian Zhong , Luo Zi Rong , Tang Li , Wang Xiao Ming
Published: August 2011

This paper brings forward a novel heaving buoy wave energy converter, which can be installed in underwater robots to supply control and circuit energy consumption during their navigation and executing other tasks. This converter can absorb wave energy on the ocean surface and transform it into electric energy for a DC generator is driven by wave energy. Then the structure and basic principle of wave energy transform methodology is presented. Finally, theoretical model of the converter’s kinetic and dynamic principle is deduced and an factual example is calculated.
The Research on Coordinated Control of Multi-Cutter Based on the Ultrahigh Pressure Water-Jet
Authors: Chen Hao , Zhao De An , Yang Nian Fa , Chen Bo
Published: August 2011

Ultrahigh pressure water-jet machine tool with multi-cutter can boost efficiency when dealing with large and complex planar workpieces. This paper focuses on the coordinated control of multi-cutter, brings forward a system frame of coordinated control of multi-cutter based on the ultrahigh pressure water-jet machine tool and having resolved the issues of compartmentalizing the interference zone and the instruction for fast moving. By using the Microsoft Visual C++ 6.0 development kits to develop an application to automatically modify the NC code and programming the PLC embedded in FAGOR NC system, it has achieved the coordinated control of multi-cutter.
Structural Design and Kinematics Analysis of Oblique Crossing 3DOF NC Spindle
Authors: Wang Zhan Zhong , Cheng Lin Zhang , Fan Xiao Ke , Han Yan Jun
Published: August 2011

Based on the study of 3R oblique non-spherical wrist and the analysis of the NC machine spindle’s function, the concept of a oblique crossing 3DOF NC spindle was offered and the 3D model of this 3DOF NC spindle was made with Solidworks software. At the same time, the kinematics model of this 3DOF NC spindle was setup with D-H parameter method and the kinematics & workspace of this 3DOF NC spindle were analyzed and simulated. Simulation results indicated that this 3DOF NC spindle, with compacted-structure, low inertness and considerable flexibility, could be in any gesture in the 3D space, and could expand the work range of the NC machine.
Weibull-Distribution-Based Method of Bayesian Reliability Evaluation for Machining Center
Authors: Yu Nai Hui , Zhang Zhi Xiong , Wang Zhuo , Zhang Xiang Po
Published: August 2011

For the machining centers which have distinguishing features of small samples and high-reliability, we proposed a Weibull-distribution-based method of Bayesian evaluation to calculate their reliability in this paper. The reliability test platform for machining centers was built and a reliability testing method which was based on the impellers’ machining process was adopted in order to get the field testing samples. Then we selected the machining centers’ reliability of a fixed time as the random variable to determine its prior distribution. The posterior distribution of products’ reliability could be obtained by combining the prior distribution and the field test samples with the application of Bayesian method. Finally, we could calculate the lower confidence limit for the products’ reliability under a given confidence level and the reliability’s mean under typical mission time.
An Introductory and Analysis of the Stationary Blade Rotary Compressor
Authors: Geng Ai Nong , Geng Kui Hua , Li Xin Mo
Published: August 2011

A new type of stationary blade rotary compressor is developed to overcome the rolling piston compressor’s weaknesses such as severe leaking loss and friction waste. The new compressor has unique sealing structures and friction-reducing techniques, featuring in that the compressor adopts a stationary blade whose out-end is hermetically fastened to the cylinder’s inner wall and the blade’s two side-ends are hermetically fastened to the end-covers which respectively set in both ends of the cylinder. Due to that the cylinder, the blade and the end-covers all are closely fitted to each other, the leakage and friction occurred from these parts are completely eliminated. This paper introduces the compressor’s working principle and structure characteristics, deduces the calculation formulas for displacement volume, chamber pressure and thermodynamic properties, and discusses the design principles of compressor structure parameters and what effects these parameters have on leakage and friction. The research result shows that the stationary blade compressor, in comparison with the conventional rolling piston compressor, has displayed some unique advantages in seal property, friction reduction, manufacturing and assembling techniques.
Research on Crack Growth Life and Sensibility Analysis of Influence Parameters in Crack Growth Life
Authors: Liu Wen Lin , Han Wei , Mu Zhi Tao , Wang Xiu Xia , Yu Da Zhao
Published: August 2011

It requires a damage tolerance assessment for all airframes and engines to set the inspection windows for safe operation. A certain rotorcraft main rotor yoke were analyzed with NASGRO model. The sensibility analysis of influence parameters in crack growth life has been done. In order to calculate the sensibility index of influence factors to crack growth life, the factors were divided into input parameters and crack growth model parameters. The results show that the input parameters have the following precedence ordering: fatigue crack growth threshold, fracture spectrum, initial crack, fracture toughness, the sensibility values are 11.25, 8.5417, 0.8333, 0.1125, respectively. The NASGRO model parameters have the following precedence ordering: n, p, C, q. the sensibility values are 6.0417, -3.9583, 1.25, 0.1812, respectively.
The Computerized Simulation Software Development of the Pneumatic DTH
Authors: Xiong Qing Shan , Li Jia , Liu Shuang Liang , Kong Fan Jiu , Ye Yong Sheng
Published: August 2011

Designing the pneumatic DTH by the method of anology, experience and actual test, the investment is large, the cycle is long, and it is difficult to achieve the optimization. In order to research profoundly the DTH work mechanism and describe piston movement laws in detail, physical model is established according to the actual conditions, finite difference method is adopted, thermodynamics and kinematics are applied. Using object-oriented programming, the pneumatic DTH computerized simulation software is developed whose integrated development environment is VB. The software can calculate acceleration, velocity, displacement, pressure, temperature of the front and back air chamber at any time and the operating performance parameters of the pneumatic DTH. The law of many factors influencing on the pneumatic DTH performance can be found and the optimization of the pneumatic DTH structure parameter can be achieved by the ergodic method. Not only the pneumatic DTH but also the no-dig impactor is designed by computerized simulation.
Design and Implementation of Virtual Interactive Scene Based on Unity 3D
Authors: Lu Gui Ping , Xue Guang Hong , Chen Zong
Published: August 2011

This paper demonstrates three-dimensional modeling method of virtual reality, and presents a 3D interactive virtual scene design based on the Unity 3D technology, combined with AutoCAD, MultiGen Creator and Unity 3D software platform. In this process, the scene and different format file has been optimized, the network interactive viewing of virtual scene is realized too. It focuses on an example designed to obtain a better real-time, interactive and good visual effects.
The Design and Efficiency Analysis of Planetary Gear Reducer
Authors: Hsieh Long Chang , Chen Tzu Hsia
Published: August 2011

Recently, the power system equipped in elevator contains motor and gear reducer to get large output torque. The purpose of this paper is to propose a desgin methodology for the kinematic design and efficiency analysis of planetary gear reducer for elevator. First, according to the concept of train value equation of the train circuit, the 2 stage planetary gear reducer is synthesized. Then, according to the latent power theorem, the mechanical efficiency of 2 stage planetary gear reducer is analyzed to be 95.43%. One planetary gear reducer is designed to illustrate the design methodology. Based on the proposed methodology, all planetary gear reducers for elevator can be synthesized.
Image Inpainting Based on Compressed Sensing
Authors: Wang Fang , Xie Mei Hua
Published: August 2011

An inpainting method is proposed to restore the image containing some missing patches. Based on the spartity of images, the method translates the problem of image inpainting into image reconstruction in compressed sensing. The inpainting model is solved using the split iteration. Simulated image inpainting results demonstrate the efficiency of the proposed method.
Synthesis, Structure Characterization and its Coordination with Metal Ions of N,N'-Diethoxycarbonyl-N'',N' ''-(1,2- Propylidene) Dithiourea
Authors: Yuan Lu , Zhong Hong , Li Li Qing
Published: August 2011

The synthesis, characterization, and its coordination with metal ions of a novel thiourea N,N'-diethoxycarbonyl-N'',N' ''-(1,2-propylidene) dithiourea was reported. The structure of the prepared compound was determined by elemental analysis, infrared spectrum, mass spectrometry, 1H NMR and 13C NMR spectroscopy. Its coordination with metal ions such as Cu2+, Ni2+, Fe3+ was investigated by uv-vis spectrophotometer. The results show that this dithiourea with new structure can react with Cu2+ and Ni2+ separately, and has a best selectivity to Fe3+ ion. Bench-scale flotation tests were also carried out, verifying it has higher copper flotation recovery compared with universal collectors and better selectivity to sulphur.
Research on the Dynamic Characteristics of Master Cylinder in the Hydraulic System on Concrete Pump
Authors: Xie Hai Bo , Lin Shu Yong , Yang Hua Yong , Zhen Yu , Zhang Jin
Published: August 2011

Currently when the domestic concrete pump is pumping, the piston of master cylinder may hit the cylinder or not travel enough displacement; the travelling rules in different conditions have been not found yet. In this paper, an open circuit hydraulic control system is researched by simulation software AMESim, pumping circuit and dividing circuit of the system are modeled and simulated. The simulation results are compared with experimental results to illustrate the accuracy of the modeling. Then the relationship between travelling displacement of the piston and the factors, such as location of trigger port, different diameter of damping u-tube, is analyzed. In the end, a set of reasonable design parameters of the hydraulic system is proposed.
Comparison and Analysis of Domestic and Foreign Design Methods of Escalators
Authors: Lai Li Ping , Wan Chuan Feng , Li Yang
Published: August 2011

Escalators are important conveyance in the vertical direction at subway stations for the capacity influences the transportation efficiency of stations. Therefore we should pay much attention to the design. England has formed mature theory in the design of escalators. The paper mainly introduces the design methods and the relevant specifications about the design factors of escalators, the technical parameters and number of escalators, the capacity and the size of queuing area of escalators in England. At last the paper summarizes several design experience abroad we can draw lessons from by comparing the England specification and China manual.
Analysis on Transient Stress State of Elastic Thin-Wall Component of Harmonic Gear Drive
Authors: Yang Wei , Duan Cheng Cai , Qiu Jian Xi , Sun Ji Ming
Published: August 2011

To overcome the crack problem of thin wall structure of harmonic gear transmission─ flexspline, we develop a transient dynamic analysis model for B1-50-80 harmonic gear transmission. Based on large displacement and large strain theory, the transient stress state of the flexspline is analyzed under maximum rated conditions. The distribution law of transient stress is obtained when the amplitude of stress histories on flexspline gear changes in sine form and the change process of stress of flexspline gear ring are from top to bottom. We observe that over-stress of flexspline on tube gradually decreases along the axis and the stress distribution between flexspline and flexspline gear ring becomes a certain slant due to force irregularly on flexspline tooth in the axial direction. The maximum Von Mises stresses appears in the contact regions between flexspline gear ring and wave generator. Therefore, cracks will originate from the dedendum regions of flexspline, then extend along the axis, and finally expand along 45°.
Heat Loss Analysis of Giant Magnetostrictive Actuator for Precision Alignment
Authors: Fang Yi , Li Xiao Peng , Liu Chuan Hui
Published: August 2011

Giant magnetostrictive actuator is ideal for fast precision Alignment, but the nonlinear strain caused by temperature rise has serious impact on the control precision. This paper verifies the impact of strain caused by temperature rising on the experimental method, based on analyzing the principle of the giant magnetostrictive actuator. The copper consumption in giant magnetostrictive actuator coil , the iron consumption in the magnetostrictive rod and the corresponding method of inhibiting temperature rise were analyzed by theoretical analysis and finite element simulation.
The Effect of Plasma Power on the Properties of Amorphous Silicon-Germanium Thin Films
Authors: Gu Long , Yang Hui Dong , Huang Bo
Published: August 2011

Amorphous Silicon-germanium films were prepared by radio frequency plasma enhanced chemical vapor deposition (RF-PECVD) on glass substrates. The structural characteristics, deposition rate, photosensitivity, and optical band gap of the silicon-germanium thin films were investigated with plasma power varying from 15W to 45W. The deposition rate increased within a certain range of plasma power. With the plasma power increasing, the photosensitivity of the thin films decreased. It is evident that varying the plasma power changes the deposition rate, photosensitivity, which was fundamentally crucial for the fabrication of a-Si/a-SiGe/a-SiGe stacked solar cells. For our deposition system, the most optimization value was 30-35W.
Intelligent Analogy on Wireless Communication Link Performance of Industry Wireless Sensor Networks
Authors: Chen Guang Zhu , Luo Cheng Ming
Published: August 2011

The received signal strength indication (RSSI) is the key factor in the communication link for industry wireless sensor networks, while it is very difficult to model the value of RSSI to the distance of two communication nodes. This paper presented a fuzzy neural network modeling method to solve the shortcoming of the theoretical modeling. After the value of RSSI and the distance value of two communication nodes are fuzzed by Gaussian membership function, a fuzzy controlling rule is also presented, and then the output value of fuzzy neural network, namely the error distance of two communication nodes can be attained. Finally, simulation results show that without correcting the environmental parameters, the estimated error value of the distance of two communication nodes through RSSI in fuzzy neural network model is less than in quadratic fit method. So, the method presented by this paper can provide precise data support for wireless sensor networks for industry environment.
The Solidified Structure and Macrosegregation of Wedge-Shaped Titanium Castings Produced by Vertical Centrifugal Casting Process
Authors: Wu Shi Ping , Xu Qin , Xue Xiang
Published: August 2011

The present paper studied the as-cast structure and macrosegregation of the wedge-shaped castings produced vertical centrifugal casting process at different mould rotating speeds. The element distributions were determined by the secondary electron line scanning in the S-570SEM type scanning electron microscope (SEM) and the grain sizes of the castings were observed by the optical stereoscope. The research results show that the grain sizes increase with increasing of casting wall-thickness, but decrease with increasing of the mold rotational speed. The cooling rate is high and rotational speed is not high enough, therefore, there is slightly macrosegregation trend for the alloy element of Al and V in the wedge-shape castings.
Compressive Sensing for the Symmetry Distribution Analysis of Thermal Radiation on the Capsule inside a Cylindrical Hohlraum
Authors: Huang Yun Bao , Zeng Zi Rong , Jiang Shao En , Wang Qi Fu , Chen Li Ping
Published: August 2011

The symmetric implosion of the pellet is very important in an inertial confinement fusion (ICF) system. The evaluation of symmetric distribution on the ICF pellet is time and memory consuming, especially when the elements of cylindrical hohlraums are iteratively subdivided. A novel compressive sensing (CS) based approach is presented in this paper to accurately valuate the distribution symmetry with much less computation. The core idea is that, the thermal radiation distribution is transformed in the spherical harmonic field, and the sparsity of spherical harmonics is accurately evaluated through CS approach. Finally, experiments are demonstrated to show higher efficiency of the proposed approach.
A New Magneto-Rheological Brake for Haptic Applications
Authors: Nguyen Phuong Bac , Lim Seung Gu , Choi Seung Bok
Published: August 2011

This paper proposes a new brake featuring magneto-rheological (MR) fluid. The outstanding feature of the proposed MR brake is the possibility of compensating for the passive friction completely. It consists of two coils, one quasi-stator and two rotors. These rotors are in relatively reverse rotation mode. After a configuration of this brake is proposed, an optimization procedure based on integrated finite element analysis (FEA) and Particle Swarm Optimization (PSO) algorithm is developed to obtain its geometric dimensions. Then, the simulated performance of the optimized brake is shown with remarkable discussions.
Research of Self-Induction & Automatic Lifting Rainproof-Curtain
Authors: Li Si Yi , Ma Ze Wen , Yang Ya Ping
Published: August 2011

It is discussed the rainproof-curtain of self-induction & automatic lifting in the paper. The rainproof-curtain consists of two parts, rainproof-curtain’s mechanical drive as well as rainfall signal detection and control system. Meanwhile, the mechanical drive includes rainproof-curtain, reel, drive motor, and so on. And the rainfall signal detection and control system includes rainfall induction and data acquisition module, infrared remote control module, drive controller, and so on. The motor is started when the rain signal is detected by rainfall sensors and is handled by singlechip. So it can be achieved that rainproof-curtain’s automatic lifting unmanned control. In addition, the automatic lifting rainproof-curtain has also manual and remote control functions.
Research of Fault Detection System Combining with Fault Tree Analysis with Artificial Neural Network in Large Scale Die-Forging Press
Authors: Yang Ji Dong , Zhang Yan
Published: August 2011

This paper research on a new fault detection method used in large scale die-forging press, based on the national major science and technology project (2009ZX04005-011). This method combines fault tree analysis (FTA) with artificial neural network (ANN), it need to pick up training samples of ANN from fault tree constructing by analyzing system first. An effective network model can be achieved through using BP algorithm to train the samples based on the tree-layer feed-forward network structure. This network model can output fault reasons according to fault symptoms.
An Integrated Micro-Gripping System for the Assembly of Miniature Mechanical Structures
Authors: Sun Yuan , Zhang Zhi Jing , Ye Xin , Zhang Xiao Feng , Feng Yan
Published: August 2011

The current developed micro-grippers are not effectively used in micro-assembly within the scale of 0.01-10mm due to some practical problems. In this paper, we present a novel integrated micro-gripping system. In this system, the vac-sorb gripper and the micro-gripper based on a linear motion stage are employed together to stably pick up miniature mechanical structures in different shapes and dimensions. The gripping force is detected in real time and used as a feedback to control the action of the system. The design of the system and the implementation of the feedback mechanism are described in details. Experiments are taken and analyzed and the results show the designed functionality of the system.
Fixed Viewpoint Imaging and Correction Model of Liquid Column Manometer
Authors: Dai Su Mei
Published: August 2011

Liquid column manometers are widely used in fluid mechanics experiments, so the design and implementation of a remote experimental setup for performing experiments on fluid mechanics, the on-line reading of liquid column manometer is necessary. Firstly, through comparing computer vision reading with manual reading, the former accuracy is much higher in the ideal case. Secondly, computer vision based reading scheme is confirmed according to the experimental progress. Then, the imaging geometric model of manometer is approximated by pin-hole imaging model. While the vertical relationship between camera viewpoint and liquid level is changed, for reducing the imaging error, view fixed reading with software algorithm is discussed to correct the identified water head. Lastly, according to the proportional relations between invariable inside diameter of manometer and water head image, the upper boundary line coordinate value is determined. The experimental results show that the method is effective and feasible.
An Ultra-Violet Pulse Detecting Based Electroscope for AC Ultra-High-Voltage Apparatuses
Authors: Wang Jin Gang , Zhang Zuo Peng , Jiang Hao , Tang Jin Hong , Liu Cong Han
Published: August 2011

A novel electroscope to detect the electrification state of ultra-high voltage power apparatuses using ultra-violet pulse detection is presented, which involves measuring the ultra-violet pulse among corona discharges from ultra-high-voltage appliances. Tests have been carried out at Guanting 750kV transformer substation; results indicate effeciveness of the electroscope to detect the electrification state with non-dusturbance.
Density-Controlled Growth of Well-Aligned ZnO Nanowires Using Hydrothermal Method
Authors: Tseng Yung Kuan , Hsiao Ching Chih , Hong Mong Chun
Published: August 2011

This study is mainly to control the density of zinc oxide nanowires arrays as main axis. We spin coated AZO thin film to Si/SiO2substrate by hydrothermal method growing ZnO nanowire arrays on a substrate by spin coating a layer of zinc powder mixed with SiO2film, and controlled the concentration of zinc. We can easily obtain a nanowire array density control. In this experiment, we investigated different centrifugation speed, time, zinc concentration, temperature and other variable parameters. Through field emission scanning electron microscopy observation of dispersive zinc oxide nanowires and dispersion situation, it was found that using different doping concentration and rotation speed, different densities can be successfully obtained for ZnO nanowires array. Dispersion of zinc oxide nanowires by hydrothermal method with increasing time, the diameter and length will increase significantly.
Research on the Mathematical Description of Style Image of Machining Centers
Authors: Jiang Ke , Wang Jing Jing
Published: August 2011

In order to develop a Web-based style semantics database system of machining centers, this paper focuses on using Image Scale to describe the style image cognition of machining centers which is a vague psychological concept, give mathematical description of image scale. Then through a style image cognition experiment, 6 adjective pairs are chosen to link with the style image cognition of machining centers, so a 6 dimensional image scale is got. At last, this paper proposes a 5´6 matrix SNCthat is called Style Description Matrix of machining centers to describe their image scale in mathematics.
A Moving Interior Boundary Method Fitted Dynamic Mesh for the Simulation of Flow through Moving Bodies
Authors: Deng Mao , Wang Zong Ming , Zhang Chun Xue
Published: August 2011

We present an easy approach to obtain the dynamic flow field with a moving body inside. Instead of popular interface boundaries, the interior boundaries were applied as moving parts, which made separated computation volumes a default-continuum meanwhile. With the combination use of UDF and dynamic mesh model, the numerical technique was tested and validated by simulating flow through moving screen, a kind of porous material. The pressure and velocity contours obtained clearly showed the changing behaviors of the flow while passing through a moving porous material, and clarified the influence posed by the movement of its frame. The method is used for the simulation of the flow with a moving body inside.
Phase Detection for Nanometer Scale Metal Film’s Thickness Based on SPR Effect
Authors: Xin Jin Dong , Liu Qing Gang , Liu Chao , Li Ting Ting , Liu Shi Yi
Published: August 2011

It is found that the phase position of p-component of reflected light changes with the metal film thickness, while the phase position of s-component almost doesn’t change in the Surface Plasmon Resonance effect. S-polarized light is taken as reference and interferometry is adopted to turn the change of the phase position into the change of interference fringes position in the paper, and the film thickness can be derived from it. The simulation results indicated that, through making use of piecewise quadratic fitting on the phase data, the inaccuracy with the range of film thickness is between 30 and 80 nanometers is not more than 0.33 nm.
Effect of Tool Shape on Increases in Sheet Thickness during Drawing and Ironing
Authors: Kotani Yuji , Watanabe Akihiro , Watari Hisaki
Published: August 2011

Prior knowledge of local increase in sheet metal thickness due to forming of products would contribute to decreasing total product weight by giving the product designer an advance notice of the appropriate sheet metal thickness distribution in a product. A method using simulation to accurately predict such increases would greatly aid the designer in this task. The designer can then distribute thicker parts where a large area moment of inertia is needed from the viewpoint of structural strength in a given section. In terms of optical designing for variable thickness distribution in products, the sheet thickness in a product need not be considered constant. This paper presents the forming prediction during deep drawing. To clarify the mechanism of increase in sheet thickness, a 3-D forming simulation is performed during deep drawing by using the finite element method (FEM). The effects of tool shapes—angle of contact with the original material and the contacting length of the punch with the material—that mainly affect the change in thickness of the original material are investigated. The thickness distribution of drawn cups is measured for comparing the simulation results obtained by FEM with the experimental results. It is shown that controlling the distribution of sheet metal thickness is possible if the original material is relatively thick, and when an appropriate manufacturing method is selected.
System of Residential Spatial in Wuhan Based on WebGIS
Authors: Dou Xiao Hua , Liu Ren Zhong , Cheng Xin Zheng
Published: August 2011

The thesis designs and develops the system for Housing space information in Wuhan based on WebGIS and Oracle. this system by applied case study of retrieving and presenting residential area distribution among groups with different income, and realize some function of residents of housing information in real-time queries and spatial distribution’s visualization, and pays support and contribution to the decision-making of urban development and government or some relative department for planning and macro-control housing prices, then avoid different income groups appear isolation tendency for Wuhan residents layout, and promote a harmonious residential space.
Analysis of Piezoelectric Acoustic Sensor Based on Negative Impedance with FEM in Composite Materials
Authors: Zhang Wen Qun , Wu Xin Yue , Cao Wen
Published: August 2011

Piezoelectric acoustic sensor with negative impedance matching circuit is put forward to enhance its sensitivity at low frequencies. The multi-physics problem coupled with sound wave equations, structure stress-strain equations, piezoelectric constitutive equations and electric ordinary equations is analyzed with FEM in detail. Frequency response characteristics are simulated when shunted with negative-capacitance, resistance in series. Sensitivity is obtained from 1kHz to 5kHz. When used proper electrical elements, the sensitivity of the piezoelectric sensor can even exceed that of no matching circuit over 2 factors in broad band.
Influence of Rail Transit with Engineering Materials on Residential Price with Hedonic Approach
Authors: Li Ying , Ju Mei Chen
Published: August 2011

Rail transit is the most effective way to solve the urban traffic problem. However, due to the large initial investment and plenty of engineering materials it needs, it is valuable to study the problem on the return of the investment benefit. The paper first proves that the benefit of the construction of the rail transit will be the increased value of the land along the rail, and the benefit can be considered as the difference between the land prices before and after the opening of the rail. Secondly, based on this theory, by taking Dalian LRT NO.3 as the case study, a practical Hedonic Approach model is developed. And then, the influence of the being planned Dalian LRT NO.4 on the land price is calculated.
Edge Isolation Using Ultra-Short Pulse Laser Materials with a Top-Hat Beam Profile
Authors: Sedao Xxx , Sarnet Thierry , Hernandez José Luis , Schulz Ruhtenbuerg Malte , Krantz Stephan
Published: August 2011

Laser grooving is an existing industrial solution for solar cell junction isolation. However there is still plenty room to improve this process. Potential approach includes choosing proper laser wavelength, tuning laser pulse width and laser focus beam profile, etc. We have recently investigated laser edge isolation of crystalline silicon solar cells using an ultra-short pulse laser. In this study we carried out isolation test using the same laser with a top-hat beam profile. A comparative study between isolation using top-hat and Gaussian is launched. The geometry of laser scribed grooves and the electrical performance of the cells are characterised. More homogenous ablation and material removal are achieved using top-hat hence the dopants from the isolation groove area are eliminated efficiently. The results from I-V characterisation confirm that more efficient isolation process and better isolation quality can be achieved using top-hat.
Effect of Glass Microballoons Size on Compressive Strength of Syntactic Foams
Authors: Chen Zhuo , Huang Zhi Xiong , Qin Yan , Shi Min Xian , Mei Qi Lin , Zhang Ming
Published: August 2011

In this work, syntactic foams made of microballoons having same wall thickness ratio but with different particle size was prepared. Microballoons of three size distribution ranges were selected .The property of the syntactic foams were studied by quasi-static compression test. The experimental results show the microballoons size doesn’t influent the mechanical properties of the syntactic foam significantly. The failure mode of the syntactic foams was also studied in this work.
Textile Pattern Design Based on Multi-Rules L-System
Authors: Meng Guang Li , Yang Xu Hong , Lin Min
Published: August 2011

The principle of the L-system is the notion of rewriting, where the basic idea is to draw a graph by interpreting a character string generated by successively replacing the initial element according to a set of production rules. In this paper, textile patterns were designed with the fractal images generated by VB program on the basis of multi-rules L-system theory. These textile patterns can be introduced into digital inkjet printing, and the applying effect on home textile were simulated.
Application of 3-D Fluorescence Spectrum and PARAFAC Method in Petroleum Pollutant Measurement and Identification
Authors: Pan Zhao , Wang Yu Tian , Shao Xiao Qing , Wu Xi Jun
Published: August 2011

The paper used the CCl4 solutions of three kinds of petroleum as experimental subject, and a series of 3-dimentional fluorescence spectra were obtained by a fluorescence spectrometer. 3-D fluorescence data of different samples consisted three-way data arrays. The paper overlooked the specific components of petroleum pollutant, and each kind of petroleum was regarded as a whole, then PARAFAC method could obtain satisfactory spectrum decomposition result, and the concentration predictions of predicted set are shown in paper. When interfering substance exists, the method is effective similarly.
Fabrication Research on the Panel Packaging for FED with Carbon Nanotube Emitters
Authors: Hao Fu Zhong , Dong Yan , Li Qiang , Zhao Feng , Zhao Bo
Published: August 2011

With simple screen-printing method, the field emission display (FED) with carbon nanotube (CNT) as field emitters was fabricated. The flat glass was used as back-plane, and the sintered silver slurry was utilized to form the conducting lines. The blank back-plane and the cathode back-plane was combined to make a panel room, and the anode back-plane would be included in it. The panel image would be formed on the anode back-plane surface, which was fixed with the blank back-plane. The glass edge of anode back-plane was treated with a inclined plane, which the conducting lines on the blank back-plane could be connected with the indium tin oxide electrodes on the anode back-plane. The whole FED panel was packaged, which possessed good field emission property and emission uniformity.
Tribological Properties of Ekonol Composites Friction Material in Traveling Ware Ultrasonic Motor
Authors: Sun Feng Yan , Qu Jian Jun
Published: August 2011

Traveling wave ultrasonic motor (TWUSM) is driven by friction force between stator and rotor. As the friction materials of contact layer in traveling wave ultrasonic motor(TWUSM), tribological properties of Ekonol composites(EK2) have important effects on motor driving characteristics and service life. Then EK2 was stuck on the stator tooth of 40 type disc-shape TWUSM. Under different driven mode and friction combination, tribological properties of EK2 was tested，and the wear morphologies of EK2 surfaces are observed by SEM. Results show that there are ultrasonic antifriction phenomenon in stator/rotor contact interface under ultrasonic drive. Ultrasonic fatigue is the main wear mechanism of contact layer. When Ek2 combine with Cu rotor， contact layer can obtain bigger friction coefficient, higher output torque and better wear properties. Then Ek2 and Cu rotor is a good friction combination which can satisfy the actual running needs of TWUSM.
Effects on Plant Growth of Material from Hydrothermal Humification Process of Biomass
Authors: Guo Shu Qing , Dong Xiang Yuan
Published: August 2011

Hydrothermal humification (HTH) is a novel way to treat biomass in order to produce soil conditioner or organic fertilizer. A plant seed germination technique was used to assess the effect of HTH material derived from garden waste on seed germination, root elongation and germination index (GI) of cucumber at different stages of incubation. The incubation experiment was carried out with the mixture of HTH material and soil at a ratio of 1:3, 1:5 and 1:10 (HTH material:soil, wet weight) in soil. The results showed there are direct positive effects of the HTH material on seed germination and root growth. GI all were over 80%. High addition rates had non significantly negative effects on plant growth.
Lattice Boltzmann Simulation on Natural Convection Heat Transfer for Phase-Change with Heterogeneously Porous Medium
Authors: Shao Jiu Gu , Liu Yang , Xu You Sheng
Published: August 2011

The problem of the natural convection heat transfer for phase-change in a square filled with heterogeneously porous medium is solved by lattice Boltzmann method. The lattice Boltzmann equation is governed by the heat conduction equation combined with enthalpy formation. The velocity of liquid part is fully coupled with the temperature distribution through relaxation time. It is found that the high Ra number has significantly impact on the heat transfer and convection, but the low Ra number has little influence on the natural convection. The porosity of the middle porous medium is nothing to do with the heat transfer and convection. The result is of great importance to engineering interest and also provides a new solution to phase transition.
Material Properties and Natural Frequency of Stator Core of Large Turbo-Generator
Authors: Wang Yi Xuan , Wang Ying
Published: August 2011

Techniques for vibration reduction and design of stator core require knowledge of its modal frequencies, which depend on the geometry shapes, dimensions and material properties. The material properties of stator core are mainly related to its laminated process and assembly as well as the operating temperature of turbo-generator. It is found that the generally accepted value of material properties is not valid for the stator core with laminated silicon steel slice and operating at about 110-120 Celsius. This paper simply summarizes the method of determining elastic properties of stator core material, considers these as uncertainty variables obeying Gaussain distribution and changing in the possible range, and then applies to Six Sigma Analysis method for the calculation of the modal frequencies of stator core.
A Case Library Creating Method Based on Risk Control of Tunnel Engineering
Authors: Tang Zi Qi , Wu Hui Ming , Bian Yi Wen
Published: August 2011

Because of low knowledge structural level in real tunnel engineering management, existing risk control methods (e.g., rule reasoning, decision tree inference) cannot completely meet the actual engineering demands. Considering the complexity of risk analysis of the tunnel engineering, this paper presents an aggregated risk control approach for tunnel engineering based on case library, i.e., representing case attribute modules using Frame representation method, reducing attributes using rough set technology, and simplifying case library by removing its redundancy in attribute similarity threshold.