bluuebunny/crossref_metadata_2025 huggingface dataset:
Design and Analysis of Hydraulic Control System for Pipe Storage and Handling System
Authors: Wang Yu , Liu Bao Lin , Hu Yuan Biao
Published: July 2011

This paper research the hydraulic control system of pipe storage and handling system. The pipe storage and handling system (PSHS) is the key parts on rig to handle the drilling pipe and it can improve the efficiency during the drilling works. The hydraulic system of pipe storage and handling system have designed according to automatic round-trip operation in drilling engineering. The mathematical modeling of hydraulic components in PSHS have established and analyzed. The simulation model of hydraulic system of PSHS is also built and simulated to analysis the characteristics of reversal valve operation, Hydraulic pressure adjusting operation, piston speed control and state of accumulator based on the AMESim. The results prove that the operations of pipe storage and handle such as pipe storage, pipe clamping, pipe lifting, pipe transfer and pipe joint can be accomplished drive by hydraulic system. Meanwhile, AMESim have great views to research the geosciences equipment.
Design Research of Efficient Vacuum-Type Rotary Drum Filter
Authors: Zhang Hong Guang , Wang Ling Guo , Xu Yan Chun
Published: July 2011

The technology is developing faster and faster, and in the chemical industry, the technology is develop towards larger size, higher precision, automotive, higher pressure, and multi function. However, for the situation that the filter tray used in our county, there is a long distance between our country and the foreigner, this topic makes some research on the problems that occurred during the usage of the filter made in china, on base of which, a better filter is designed, and the new filter achieved good results. This article introduced some key issues during the design of filter.
Feasibility Analysis and Status of Shallow Pipe-Jacking Technology in Urban Drainage Systems
Authors: Yang Zhuan Yun
Published: July 2011

Considering the current domestic situation that there is no provision for shallow pipe-jacking (with overburden soil layer not thicker than 3 m and 1.5 times of the pipe external diameter) in the existing water supply and drainage pipeline engineering design and construction specifications, a comprehensive analysis and discussion, based on the actual domestic condition, is made on the feasibility of shallow pipe-jacking technology in urban drainage systems. The problems confronting the shallow pipe-jacking technology theory research are also analyzed and the research status of shallow curve pipe-jacking technology is introduced.
Research on Automatic Washing Machine Control System
Authors: Ding Shou Cheng , Li Wen Hui , Yang Shi Zhou
Published: July 2011

Microprocessors and sensor technology together achieved a fully automatic washing machine based on fuzzy control. System used an integrated mixed-signal system-level C8051F020 microcontroller. The system would detect and reasoning on the amount of washing objects, fabricl quality, water level, reference washing time, the flow intensity, real-time temperature and dirt level of washing liquid, so as to achieve automatically complete the whole washing process. Experiments shows that the system is stable, easy to operate, cost-effective advanced features, so that it has a certain value.
Detection of Human Body Motion Based on Electrostatic Measurements in the Indoor Environment
Authors: Zheng Wei , Cui Zhan Zhong
Published: July 2011

An effective non-contact electrostatic detection method is used for human body motion detection. Theoretical analysis and pratical experiments are carried out to prove that this method is effective in the field of human body monitoring, in which a model for human body induced potential by stepping has been proposed. Furthermore, experiment results also prove that it’s feasible to measure the average velocity and route of human body motion by multiple electrodes array. What’s more the real-time velocity and direction of human body motion can be determined by orthogonal electrostatic detector array, and the real-time velocity and direction of human body motion can be obtained within the range of 2 meters.
Research on the Radial Accuracy and Stiffness of HSK Tool System in High Speed Machining
Authors: Zhou Chun Jiang
Published: July 2011

The radial positioning accuracy and stiffness are two important indexes to measure the performance of tool system. Once HSK tool system is in operation, the gap between the spindle and shank will enlarge, thus will make the radial positioning accuracy and stiffness lower. The influence factor leading to this problem is analyzed in this paper through elastic mechanics and finite element analysis. It can get from the analysis that the double-position structure and certain amount of interface are key factors to keep HSK high radial positioning accuracy and stiffness. In addition, the influence of clamping force and rotate speed to radial stiffness is presented that higher speed and larger clamping force make the radial stiffness better. Finally, the paper has verified the analysis of radial stiffness through the experimental measurement with different fit of HSK.
Analysis of Biomedical Prospect of Leaves from Liriodendron Chinense (Hemsl.) Sarg by GC/MS
Authors: Zhang Dang Quan , Zhang Huai Yun , Guo Lin Lin , Peng Kuan
Published: July 2011

Liriodendron chinense (Hemsl.) Sarg (Chinese tulip tree) has a long history of utilization and plantation, but the chemical components of benzene/ethanol extractives of Liriodendron chinense (Hemsl.) Sarg leaves were unrevealed. The analytical result by method of GC/MS showed that the chemical components of benzene/ethanol extractives of freeze-dried Liriodendron chinense were identified as 55 constituent, and the main components are as: 2-Propenenitrile, 2-chloro- (13.75%), 1-Mercapto-2-heptadecanon (13.10 %), 1-Mercapto-2-heptadecanon (12.77%), Ethanol, 2-butoxy- (12.03%), 1-Docosanol (10.74%), Guanidine, (4-aminobutyl)- (5.05%), 5,10-Pentadecadiyn-1-ol, acetate (4.82%), 1,2,4-Butanetriol (3.13%), Thiophene, 2-ethyltetrahydro- (2.09%), 1-Eicosanol (2.00%), 1-Butanol, 3-methyl-, formate (1.60%), Butanoic acid (1.60%), .alpha.-D-Xylofuranoside, methyl 3,5-di-O-methyl- (1.30%), Phenol, 2,6-dimethoxy-4-(2-propenyl)- (1.29%),5.alpha.-Pregnane-12,20-dione (1.12%), Cyclopentanol (0.82%), etc. As the first report here, our result by GC/MS showed that the benzene-methanol extractive of freeze-dried leaves from Liriodendron chinense (Hemsl.) Sarg can be developed into top value-added materials of medicines and spicery.
The Processing Quality and Control Measures of the Box-Shaped Piece Drawing
Authors: Yuan Hong Ling
Published: July 2011

This essay explores the often encountered quality problems of the box-shaped piece in drawing and the relative control measures. Detailed analysis and numerical simulation of using better materials, optimizing the blank shape, taking appropriate pressure-pad-force and suitable drawing equipments are provided. This essay is helpful for the improvement of the drawing formation quality.
Comprehensive Utilization and Resources of Gold Mining Tailings
Authors: Wang Wei Zhi , Yang Chun Guang
Published: July 2011

The gold mine discharges tailings massively every day,which results in gold and useful metal draining,simultaneously brings the enormous harm to the environment The approach to comprehensive utilization of tailings of gold mines, including recycle of usable mineral and direct use of ore tailings,is analyzed in the paper, laying a foundation for continuous development of gold mines，comprehensive utilization of resource，and protection of environment.
Dynamic Study of 8-R Seven Bar III Degree of Freedom Linkage Mechanism
Authors: Chu Zhi Bing , Li Dan , Huang Qing Xue
Published: July 2011

The system dynamics mathematical model for 8-R seven-bar Ⅲ linkage is induced through plurality, and then translated into matrix format, the modeling is solved for given mathematical model as well as the correctness of overcome is analyzed to give relative response curve, and the purpose is to calculate energetic parameter during the mechanism working precisely, meanwhile experiment results show constraint reaction force and driving force in the process of shearing with rolling-cutting bilateral shear , by using statistical energetic parameter to verify the correctness of above mentioned mathematical model as well , which gives a basis for design , control principle analysis and practical use for the mechanism .
Surface Reconstruction by Alpha Geometric Shape Based on Triangulation
Authors: He Xue Ming , Hua Chen Liang , Li Cheng Gang , Ni Min Min , Jin Qing Hua
Published: July 2011

Surface reconstruction by alpha geometric shape based on triangulation is a new idea and method in computer graphics and reverse engineering. In the process of Topology reconstruction, the points are reduced and projected to a middle slice plane. The adjacency among slices is established by section line subdivision, and triangle mesh is stored and called by the form of STL. The simplexes are classified and computed in order to obtain α interval by the external-ball radius and center of every simplex, and the data structure is designed to save them. Through the man-machine interactive selection modes, α-shape can be reconstructed by different α parameters. The surface reconstruction is completed.
Flat Rate Mechanical Optimizational Analysis of Four-Lane Tunnel with Single Arch Based on Load Structure Model
Authors: Liu Tong , Dong Zi Chao
Published: July 2011

In order to analyze the influence of flat rate on mechanical character of large-span tunnel structure, the structural analysis of three flat rates in four-lane tunnel with single arch is progressed by the compiled procedure of load structure model. The result shows that the lower flat rate is, the more unfavorable structural stress is and the more unstable surrounding rock is, the optimal flat rate of four-lane tunnel is 0.65.
The Design and Implementation of the Core Algorithm of Embedded Real-Time Image Compression Technology
Authors: Qu Tao , Tang Cong , Zhang Yu Yu
Published: July 2011

This paper presents a FPGA-based implementation of the core algorithm of embedded real-time image compression technology. The algorithm is based on JPEG image compression method which is the most widely used. For the key part of the image compression, made a kinds of fast algorithms of 2D-DCT calculation. The 2D-DCT is decomposed into two 1D-DCT computing, and within the FPGA multiplier and adder using a complex method, so that it greatly reduced the complexity of FPGA and improved the processing speed of the image. And it achieved real-time compression of image requirements.
Synthesis and Characterization of the ZSM-5/MCM-41 Composite Molecular Sieves
Authors: Wang Li Qin , Yu Ning , Han Yang , Yang Xiang Ni , Zhao Xiu Li
Published: July 2011

The ZSM-5/MCM-41 composite molecular sieves were synthesized in the method of hydrothermal crystallization in the presence of cetyltrimethylammonium bromide (CTMABr) as template agent. The prepared composite molecular sieves were characterized by the means of X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and the thermogravimetric and differential thermal analysis (TG-DTA). The experimental results showed that as-prepared ZSM-5/MCM-41 composite molecular sieves kept both crystal structure and compositions of ZSM-5 zeolites and MCM-41 molecular sieves. The decomposition temperature of the template agent was 293°C, and the decomposition temperature of the molecular sieve framework was higher than 800 °C. We supposed that the obtained ZSM-5/MCM-41 composite molecular sieves had high thermal stability, framework rigidity and structural stability, and could combine the properties of ZSM-5 zeolites and MCM-41 molecular sieves successfully.
A New Method about Port Scan of Network Hosts
Authors: Han Xin Chao , Ma Yong Qiang
Published: July 2011

To resolve the question: accurately scanned the port of remote network host through firewall, researched deeply on the existing scan methods, found their weakness, provided a new method about port detection through firewall. Described the design thinking and scan process, design the first part of ETHERNET, send out and receive of the data packet was turned from the IP layer to data link layer. delivered the data packet directly to network hosts. At last, developed the network security assessment system based on this way. Test results show that this method can penetrate firewall and accurately scan the port of remote network host.
Influence of the Structure of Comb-Shaped Polymer on the Adsorption between the Polymer and SO42- Ions
Authors: Duan Guo Rong , Wang Xin , Huang Guo Hong , Gong Ying
Published: July 2011

Comb-shaped hyper-branched polycarboxylate admixture polymers, both the water-reducing-type JS and slump-retaining-type BT, were prepared, and their adsorption characteristics with SO42- ions were studied by conductivity loss experiments. The results indicated that the adsorptions were related to both the content of carboxylic acid groups in polymers and the concentration of Na2SO4 solution, adsorptive action was formed by the complexation action between the carboxylic acid groups in polymers and SO42- ions, having nothing to do with polyether side chain in polymer. Comb-shaped hyper-branched polymers in aqueous solution would form association super-molecular structure, which could be destroyed by Na2SO4 solution.
Feature Selection for Object Recognition by Property Related Analysis
Authors: Zhang Yong Mei , Ma Li
Published: July 2011

The realization of object recognition is discussed, the intrinsic relation between factors through high step association analysis is presented to mine the various features using property related analysis, the sensitive recognition features are chosen to improve the recognition efficiency. A multi-agent object recognition model(MAORM) is established, which combines concurrency research results and the specific characteristics of multi-sensor remote sensing image recognition. A majority-decision algorithm based on multi-agent is proposed. Experiment results show the system can effectively identify the bridges, wharfs, ships and so on. Compared with a single remote sensing image, the system can distinguish targets with higher recognition.
Trasmittance Self-Oscillating Behavior of a Non-Thermoresponsive Polymer Chain Induced by the Belouzov-Zhabotinsky (BZ) Reaction
Authors: Hara Yusuke
Published: July 2011

In this study, the influence of the temperature on the transmittance self-oscillation of a non-thermoresponsive polymer chain was investigated. The polymer chain was composed of a biocompatible and non-thermoresponsive poly-vinylpyrrolidone (PVP) main-chain covalently-bonded to the 10 wt% ruthenium catalyst moiety (Ru(bpy)3) of the BZ reaction. As a result, the amplitude of the transmittance self-oscillation slightly decreased with the increase in the temperature. The period of the transmittance self-oscillation decreased with increasing the temperature in accordance with the Arrenius equation. Therefore, the period of the self-oscillation can be controlled by the selection of the temperature.
Phases and Thermoelectric Properties of Bulk CoSb3 Prepared by Wet Milling and Sintering
Authors: Liu Ke Gao , Zhang Wei Ping , Shi Lei
Published: July 2011

For investigating the effect of wet milling time on thermoelectric properties, bulk CoSb3 was prepared via wet milling and sintering. The phases of samples were analyzed by X-ray diffraction and their thermoelectric properties were tested by electric constant instrument and laser thermal constant instrument. Experimental results show that, the major phases of the samples sintered from the powders wet-milled 2 and 6 hours are CoSb3 while the samples sintered from powders wet-milled 12 and 20 hours have more impurity phases under the experimental conditions in this work. The electric resistivities of the samples sintered from the powders wet-milled 2 and 6 hours increase with rising temperature, which show the characteristic of typical semiconductor electricity and P-type conducting due to the positive Seebeck coefficients. However, the samples sintered from powders wet-milled 12 and 20 hours show N-type conducting due to their negative Seebeck coefficients. The ZT values of the samples sintered from the powders wet-milled 2 and 6 hours are relatively higher than other samples, which increases with the temperature rising at 100~400 °C, the highest value is 0.078.
Two Design Projects of Multifunctional Scanning Electron Microscope Sample Stages
Authors: Liu Ke Gao , Sun Xi Qiang
Published: July 2011

At present, the use of scanning electron microscope (SEM) is becoming more and more extensive in the field of materials examination. But it may be restricted since most of the SEM sample stages just have single function and the existing multifunctional SEM sample stages are poor practicability. In this schematic design, two multifunctional SEM sample stages are designed by means of reforming the construction of SEM sample stage. Specifically, the aims of conducting structural dynamic observation in the process of stretching or compressing samples and detecting flexible long samples are achieved by installing different mechanical clamping devices on the SEM sample stage base. Furthermore, the two multifunctional SEM sample stages have advantages of relatively simple construction, low lost and strong practicability.
The Non-Destructive Measurement Instrument for Material Thickness
Authors: Ding Shou Cheng , Li Wen Hui , Yuan Gui Ci
Published: July 2011

In a variety of materials, the ultrasonic propagation velocity is different. Using ultrasonic reflection principle in the material, the measuring instrument detected the thickness of the measured object. AT89C51 microcontroller as the system core, with ultrasonic probe, transmitter circuit, receiver circuit, counter circuit, LCD display circuit together, completed the measurement of materials thickness. The measurement range was up to a 1.2 ~ 200mm. Practice shows that the instrument is low cost, high speed, high precision, reliability, adaptability, etc. So it has broad application prospects.
The Effect of Twist on the Tensile Strength of Yarns with High Performance
Authors: Wang Ping , Zhang Yan
Published: July 2011

Yarns with high performance are more and more widely used in geotextiles. In this paper, the author researched the effect of twist on the tensile behaviors of high performance yarns. Due to the superior tensile strength of these yarns, the tensile tests can’t be operated on the normal textile yarns testing machine and all yarns were tested on the fabric strength tester. The results reveal that the tensile strength of yarns will firstly increase, and then decrease with the increasing twist. The simple analyses were also proposed to demonstrate this phenomenon.
Reaction Synthesis of (Ti,Cr) 2AlC/Al2O3 In Situ Solid Solution Composite
Authors: Zhu Jian Feng , Han Na
Published: July 2011

The (Ti,Cr)2AlC/Al2O3 solid solution composite has been synthesized by in situ aluminothermic reduction of the blend powders of Ti, Al, Cr2O3 and carbon black. The phase evolution during the formation of the composite was examined at the temperatures from 700 °C to 1400 °C. Based on the results of X-ray diffractometry (XRD) and differential scanning calorimeter (DSC), a possible reaction mechanism was brought forward to explain the formation of (Ti,Cr)2AlC/Al2O3 solid solution composite. Above the melting point of aluminum, liquid Al reacted with titanium to form the intermetallic compound of TiAl. As the temperature increased to 900 °C, the intermetallic compound of TiAl reacted with TiC to form Ti2AlC. The microstructures of the as prepared samples were also analyzed by the scanning electron microscope (SEM) together with the election dispersive spectroscopy (EDS).
Development Strategy for Demand of ICTs in Business- Teaching of CRHEIs
Authors: Liu Hong
Published: July 2011

State education business institutes are believed as catalyst for the economic progress (especial for commerce) of any country. In China, many regional higher education institutes (mainly be regional university) have been founded from 1998. From 2006, most of those regional higher education institutes, such as regional university, promoted to be comprehensive regional higher education institutes (CRHEIs) in succession. Now more andmore students studying in those CRHEIs, and then the quality of teaching should be improved. In this paper, we analyses ICT (Information and communication technology)–based teaching and learning issues at CRHEIs level and old higher education institutes (ORHEs) level. Using normative Delphi method, we discussed ICT-based issues and get that ICT integration in CRHE need to be in lined with proper strategy in order to get their true benefits.
Research on Embedding Strength of Diamond
Authors: Yang Jun De , Luo Zhong Ping , Lu Fan , Wang Yuan
Published: July 2011

It is stated that Diamond saw blades requires high embedding strength of the diamond, while diamond drill bits do not. It is necessary to improve the embedding strength of diamond in diamond saw blades, rather than in the diamond drilling bits. It is recommended to count the number of diamond particles on the matrix surface and get the embedding strength of diamond by calculation. Another recommendation is to use the compound powder of cobalt and tungsten carbide for pelletizing in order to improve the embedding strength of diamond and lower the cost of matrix. There are people studying how to raise embedding strength of diamond, for both diamond saw blades and diamond drilling bit. However, the requirements for embedding strength of diamond saw blades and diamond drilling bit are different. The following parts include the analysis for this problem.
Turbulence Flow Analysis of Low Temperature Propellant Flowing through Pipes of Filling System
Authors: Song Jian Jun , Du Xiao Ping , Zhao Ji Guang , Chen Jing Peng , Wang Qiao , Feng Bi Ming , Li Xin , Jiang Yu
Published: July 2011

With aiming at the problem of liquid hydrogen flowing through filling system in space launch site, the author set up a turbulence model and coupled with the analysis of turbulence condition of liquid hydrogen in tube. Based on the computational fluid dynamics, the flow field was studied according to the numerical simulation method. Then, the changes of flow parameters i.e. pressure and velocity at the tube were observed. Simulation results showed that, in the inlet-section, there existed boundary-layer, besides, the velocity and pressure which changed continually was not stable until the liquid hydrogen flowed through on-way. In addition, in water-carrying section of turbulence flow, the velocity distribution was even and there was no obvious delamination which explained that the mix was intense. The velocity near the surface of the tube was about zero and the pressure turned to smaller with the increase of tube length. As a result of the pressure drop, there existed the loss of on-way. The above simulation results which provided the theoretical basis for liquid hydrogen study accorded with the actual condition.
Research on Airborne Blue-Green Laser Anti-Submarine Technology
Authors: Li Hai Yan
Published: July 2011

Submarine is applied widely in naval war and this urges navy in every country develop anti-submarine equipments and weapons. The airborne blue-green laser anti-submarine becomes a new method. In this paper, the basic principle of airborne blue-green laser anti-marine technology and work process are introduced firstly, and then the system constituents are analyzed. The performance demand of laser transmitter, receiver and maximum depth and depth detection accuracy are discussed. The results proved that detecting submarine by laser is efficient, especially in the shallow sea which is only several decameters deep.
ZnO Field-Effect Transistor Fabricated by RF Magnetron Suputtering and Lithographic/Wet Etching Processes
Authors: Ma Hong Yu , Ding En Jie , Shi Zeng Liang
Published: July 2011

The fabrication of zinc oxide （ZnO）based thin-film field-effect transistors (TFTs) on p-Si substrates by rf magnetron sputtering, photolithography and wet etching processes was presented. Bottom-gate-type thin film transistors using ZnO as an active channel layer were constructed, and their properties were characterized by atomic force microscope, X-ray diffraction and I-V measurements. The fabricated ZnO transistors exhibited enhancement mode characteristics with the on-to-off current ratio of ∼105 and the threshold voltage of 10V. It is believed that the ZnO TFTs fabricatd by the simple and low-cost technique could be applicable to electronic devices.
Volumes Constrained Layout Optimization of a Continuum with Multiple Materials
Authors: Cai Kun , Jiao Shi
Published: July 2011

A sequencing approach is presented to deal with the layout optimization of a continuum with multiple materials. Commonly, a structure may not have only one type of solid phase, e.g., steel-reinforced concrete structure. To have an excellent mechanical performance of the structure, the layout of the steel-lips should be optimized. It is difficult to solve such kind of optimization problem by traditional method, especially, the number of phases is big. In this work, a criterion method is presented and the essentials of the method are as follows. For example, a structure with many materials, however, initially is set to be with the same solid which is stiffest among the materials. Firstly, the field of strain energy density (SED) of structure is obtained by finite element analysis (FEA). Secondly, the sequence of the SEDs of elements is complemented. Thirdly, according to the order of the SEDs, the material of the elements with lower SED is replaced with the softer material. To keep the stability of algorithm, only a small part of elements is changed in each update. As the amount of a material reaches its critical values, the final layout of the material in structure is obtained. Fourthly, repeat the process for different phases, the layout optimization of the structure is completed until all of the amounts of materials reach their critical values. Finally, numerical examples on volumes constrained optimizations are given to demonstrate the validity and efficiency of the present method.
An Analytic Solution for Characterizing the Fracture Toughness of the Inhomogenous Coatings on Substrates
Authors: Yang Ban Quan , Li Fa Xin
Published: July 2011

A mechanical model of coating-substrate specimen is developed that allows us to derive analytical solution to quantify the residual stress and yield strength gradient effect resulting from surface heat treatment on energy release rate of the coating on its substrate. Using a Micro-Composite-Double-Cantilever–Beam Model (MCDCBM), the analytic solutions can be derived, and they can be used to characterize the fracture toughness of the inhomogenous coatings on substrates in terms of the critical energy release rate. Finally, a numerical example is presented to show how the critical energy release rate is obtained.
Sulphate Acid Catalyzed Ethanol Pulping of Wheat Straw
Authors: Luo Peng , Pan Dao Jin
Published: July 2011

In order to produce paper from agricultural residues such as wheat straw, it is necessary to delignify the wheat straw. Ethanol cooking is a novel process for the fractionation of biomass components. This study evaluated the effectiveness of sulphate acid catalyzed ethanol pulping on pulp yield, chemical composition of wheat straw, strength properties of the resulted paper sheet. The raw wheat straws, which were impregnated with 1.0% sulphate acid for about 12 h at room temperature, were subjected to ethanol cooking. The results showed that total pulp yield and kappa number decreases while screened pulp yield and brightness increases as the cooking severity increases. The optimal conditions of pulping were determined. Under the optimal condition, the screened pulp yield was up to 55.4%, with the kappa number of 66.35, brightness of 16.1 SBD, and the maximum paper sheet strength.
Development and Application of Super-Hard Cutter Material
Authors: Liu Ji Bao , Shi Zheng Fang , Li Xiao Jing , Wang Di
Published: July 2011

The CIMS development and the high-speed cutting has given a higher demands on cutter performance. It is an tremendous tendency of studying excellent wearing resistance and high stability. PCD (polycrystalline diamond) and PCBN (poly cubic boron nitride) can obtain more higher finished surface quality, which cannot acquire by regular cutting process. This study introduces super-hard cutters materials (PCD and PCBN) development, and discusses two kinds of material properties, The features of them used in different cutting fields are given.
Microstucture and Mechanical Properties of Semi-Solid Sn–58Bi Alloy
Authors: Hu Yong Jun , Zhong Bin Qiang , Li Feng , Cheng Xiao Ling , Xiao Xiao Ting , Li Yong , He Jian Nan , He Yuan Chuan , Zheng Chun Chun , Zheng Yu Chuan , Wu Yu Chi
Published: July 2011

Preparation of semi-solid Sn–58Bi alloys by mechanical stirring casting method was investigated. The effect of temperature below the melting temperature on the microstructures and mechanical properties of semi-solid Sn–58Bi alloys was discussed. The experimental results showed that long plate shape, block shape and suborbicular Sn phases were formed by mechanical agitation during the casting solidification process. The non-lamellar Sn-Bi Microstructure improves prominently the elongation of Sn-Bi alloy. The elongation of semi-solid Sn-Bi alloy with suborbicular Sn phase is enhanced up to 37% compared with the elongation of lamellar eutectic Sn-Bi alloy prepared by conventional die casting. After the agigation above 130 °C, non-lamellar Sn-Bi eutectic structure is formed and lamellar Sn-Bi eutectic precipitates. When the agitating temperature was 135 °C, the elongation of semi-solid Sn-Bi alloy mixed with non-lamellar and lamellar Sn-Bi alloy microstructure is enhanced up to 24%.
A Defensive OTP-Based Mechanism against Application Layer DDoS Attacks
Authors: Ye Xi , Wen Wu Shao , Ye Yi Ru
Published: July 2011

In this paper, we present the design and implementation of OTP-DEF, a kernel extension to protect web servers against application layer DDoS attacks. OTP-DEF provides authentication by using OTP-based tests, which is different from other systems that use graphical tests. First of all, according to the load of web server, an OTP-DEF web-server should fall into one of three following modes: normal, suspected attack or confirmed attack mode, and the OTP-DEF authentication mechanism shall only be activated when web-server is in suspected attack mode. Secondly, we use OTP as our puzzle, which can automatically change at the certain time interval. It makes our proposal can defend socially-engineered attack, copy attacks, replay attacks and Brute-Force Attack. Thirdly, OTP-DEF uses an intermediate stage to identify the IP addresses that ignore the test, and persistently bombard the server with requests despite repeated failures at solving the puzzles. These machines are zombies because their intent is to congest the server. Once these machines are identified, OTP-DEF blocks their requests, turns the tests off, and allows access to legitimate users who are unable or unwilling to solve tests. Finally, OTP-DEF requires no modifications to client software.
Performance Analysis of a Robust Matched Subspace Detector
Authors: Li Ting Jun
Published: July 2011

The area of robust detection in the presence of partly unknown useful signal or interference is a widespread task in many signal processing applications. In this paper, we consider the robustness of a matched subspace detector in additive white Gaussian noise, under the condition that the noise power is known under null hypothesis, and unknown under alternative hypothesis when the useful signal triggers an variation of noise power, and we also consider the mismatch between the signal subspace and receiver matched filter. The test statistic of this detection problem is derived based on generalized likelihood ratio test, and the distribution of the test statistic is analysis. The computer simulation is used to validate the performance analysis and the robustness of this algorithm at low SNR, compared with other matched subspace detectors.
Three Gorges-Gezhouba Cascade Reservoirs Multi-Objective Optimization Decision Support System Overall Design and Implementation
Authors: Xu Nan , Wang Xian Jia
Published: July 2011

The decision-making process of reservoir operation is extremely complex and DSS (Decision Support System) has been used in reservoir operation management in many cases. The paper presents a decision support system for Three Gorges-Gezhouba cascade reservoirs multi-objective optimization. Our approach employs Matlab platform as system developing tool, which greatly saves programming time. And B/S mode user interface is adopted in our project since it is economical and easy to be maintained.
Appraisal Model on the Values of the Green Ecological Real Estate Brand
Authors: Ren Hong , Liu Jian Bing
Published: July 2011

The real estate has become an important pillar industry in our current, green ecological real brand is one of the most important intangible assets of the real estate enterprises. How to appraise the value of green ecological real value is the difficult problem of the real estate enterprises and theory horizon, and is also the problem of the real estate enterprises very concerned about and urgent need to solve. This article analyzed the traditional methods of assessing the brand value assets ，the new appraisal method of green ecological real estate brand value is proposed based on the economic added value and the weighted average cost of capital model and β coefficient , the economic added value more reflects the objective earning power of green ecological real estate brand , the weighted average cost of capital models and β coefficient reflects the actual performance of green ecological real estate, the evaluation results approach the objective and reasonable results, The method provides an important technical support and guarantee for appraising the value of green ecological real estate brand.
Evaluation on Independent Innovation Ability of High-Tech Industry Based on Rough Set and Projection Pursuit Model
Authors: Wen Jian , Lei Li Juan , Tian Zhi Qiang
Published: July 2011

It is important to evaluate the independent innovation capacity of high-tech industry scientifically, which could accelerate high-tech industry to become the main body of regional economy. In this paper the evaluation indicators of the independent innovation capacity of high-tech industry are reduced with the distinction matrix algorithm of the attribute reduction based on rough set theory. And then, projection pursuit model method based on genetic algorithms is used to get the synthetic evaluation. High-tech industry of Henan province as a specific example is given according to the evaluation index system with 4 primary indicators and 12 secondary indicators for independent innovation capability. It is proved that the evaluation method is feasible and effective.
Modeling the Propagation of Wireless Worms among Vehicles
Authors: Guang Min Liang , Dan Shao
Published: July 2011

We investigate the problem of a widespread occurrence of an unknown worm in vehicular networks at equilibrium traffic. We introduce an intelligent microscopic mobility and consider the fading effect in channel model; meanwhile we design a new series of rules to imitate the most relevant aspect of medium access control. The extensive Monte Carlo simulations uncovered the impacts of the transmission range (from minimum to maximum), the velocity (from free to congested), and the vehicle density (from sparse to dense) on worm spreading.
Real-Time Text Detection in Color Images Based on Color Projection
Authors: Wu Jian Jie , Zhang Yu Hui
Published: July 2011

In SMT production line, different types of components may have the same shape but providing different functions. The only difference between these components is the text on surface of a component indicating its type. Therefore, not only geometry defect inspection but also text detection is needed in component inspection to avoid wrong use of components. Traditional algorithms based on pixel comparison of text image are time consuming and sensitive to tiny change of the text as well. A concise text detection algorithm based on color projection is proposed. The algorithm transfers two-dimensional color image to one-dimensional curve for comparison by projection of the text image, which greatly reduces the computing amount, increases speed and makes the algorithm less sensitive to displacement or rotation of the text. Experiments show that the algorithm can ensure effective real-time text detection.
Autonomic Indoor Fire Extinguishing System
Authors: Wang Dong Xing , Chen Su
Published: July 2011

The most commonly used indoor fire extinguishing systems are automatic sprinkling fire extinguishing systems. However, such systems have disadvantages of difficult to maintenance and low in reliability. The design of a composite indoor fire distinguishing system has been proposed, which consists of a fixed fire early warning subsystem and a moveable fire detecting and extinguishing subsystem. The moveable fire detecting and extinguishing subsystem is established on an automated guided vehicle. The system is fully autonomic, robust, and easy to maintenance. In addition, it can promptly and precisely detect fire in its early stage, and extinguish it in time. Experiments have demonstrated that the system is applicable.
Design and Implementation of Report Model for Base Information of Farm Produce Quantity Security Based on TelerikReporting Component
Authors: Zhang Shu Dong , Sun Zhen Xing , Luo Ning
Published: July 2011

We design and implement a kind of dynamic report model in Silverlight application which based on TelerikReporting component and the technology of dynamic linked library. This model supports multi-parameter choice and can format custom report dynamically based on decided condition. By custom filter, this model implements filtrating large amount of data by receiving multiple parameters with multiple values.
An Intuitionistic Fuzzy Set-Based Model for Intelligent Traditional Chinese Medicine Diagnosis
Authors: Wu Mei Hong
Published: July 2011

According to the characteristics of Traditional Chinese Medicine, this paper introduces an intuitionistic fuzzy set-based method to realize the intelligent diagnostic decision making. We firstly concentrate on diagnosis of diseases and differentiation of syndromes by modeling medical diagnosis rules via intuitionistic fuzzy relations as well as how to obtain intuitionistic medical knowledge on the basis of intuitionistic fuzzy sets. Subsequently we develop a new approach to point out the final proper diagnosis by largest degree of intuitionistic cognitive fuzzy match between symptoms characteristic for a patient and symptoms indicate the considered illnesses in decision-making process. The new approach allows reaching the intelligent diagnoses reasonably and easily, which benefit TCM syndrome differentiation for the whole diagnosis.
The Application of Maya in Film 3D Animation Design
Authors: Liu Jun , Li Cheng Mao
Published: July 2011

With the economic becomes globalization and integration. Animation is a high-tech industry. It contains some factors, such as capital-intensive, labor-intensive, technology-intensive and knowledge-intensive and so on. With the advantages of quick startup, expansion and strong, great space for development, as well as zero pollution, animation became the most important entertainment industry and can keep pace with videos and music.
Polynomial Approach Modeling of Resonator Piezoelectric Disc
Authors: Elmaimouni L. , Lefebvre J.E. , Ratolojanahary F.E. , Raherison A. , Bahani B. , Gryba T.
Published: July 2011

Legendre polynomial method which describes the structure and incorporates automatically the boundary conditions in constitutive and propagation equations is used to model acoustic wave cylindrical resonators. It is the first time this method is applied to study standing rather than propagative waves. The advantage of this approach is, in a unique formulation, to take into account electric sources. The analytical and numerical resolutions are presented to highlight the potentialities of the Legendre polynomial approach. The vibration characteristics of piezoelectric discs with regard to diameter to thickness D/H ratios are analyzed by the three dimensional modeling approach through both modal and harmonic analyses. Resonance and antiresonance frequencies, electric input impedance, dispersion curves, field profiles and electromechanical coupling coefficient, easily obtained, are presented for PZT5A resonator piezoelectric discs. To validate our approach, the results using our 3D polynomial modelling of acoustic wave resonator are compared with those obtained by an approximated analytical method. The developed software proves to be very efficient to retrieve the radial modes of all orders.
Characterization of Grains Size by Ultrasounds
Authors: Badidi Bouda Ali , Aljohani Mohammed S. , Mebtouche Ahmed , Halimi Rafik , Djerir Wahiba
Published: July 2011

A mechanical or thermal treatment of a material can change, among other things, the average grains size. It depends on temperature, holding time, cooling condition or rolling stress. The average grain size, as well as its influence on the propagation velocity and attenuation coefficient of ultrasonic waves, also affects the wave frequency propagating through the material. Grain size is an indicator of material fatigue. It can therefore be used in monitoring or fatigue damage prevention. In this paper, we study the effect of various heat treatments hence different steel average grain sizes on the ultrasonic wave frequency after crossing the material. We have performed the same experimental study on aluminum samples. The different grain sizes are obtained by rolling. The frequency shift measurement of longitudinal waves is achieved by immersion with two probes of different frequencies 2.25 and 5 MHz. The experimental results are shown as curves giving the frequencies depending on the grain size. Heat treatments on steel and aluminum rolling performed on the samples have yielded a grain sizes gradient. Our results are consistent with the theory because of the important path in the sample and in this case the down shift frequency is paramount. They show a direct relationship between the frequency shift and the average grain size. It is therefore possible to trace quantitatively to an average grains size from the frequency of an ultrasonic wave that has passed through this material and hence its thermal or mechanical fatigue state.
Fabrication and Characterisation of Polysilicon-Based Clamped-Clamped Filter
Authors: Zhao Yong Mei , Ning Jin , Han Guo Wei , Si Chao Wei
Published: July 2011

The rapid growth of micromaching technology makes the miniaturized or integrated MEMS resonator or filter become possible. This paper reports on the fabrication and characterization of the polysilicon-based RF MEMS filter, comprised of the two clamped-clamped resonators coupled with the micro dimensions beam. The surface micromaching technology has been adopted to fabricate the clamped-clamped filter. The fabricating process and the optimization of the typical micromaching process for the MEMS RF filter are illustrated in detail. After the fabrication, the resonating characteristics are measured. The center frequency of 30 MHz of the micromechanical bandpass filter is demonstrated.
Two-Dimensional Motor Based on Surface Acoustic Wave
Authors: Zhang Guan , Li Yi Gui , Zhang Jun Feng , Yang Chun Sheng , Liu Jing Quan
Published: July 2011

With the development of high precision processing, the miniaturization demand of motors with super-precision positioning and simple fabrication become an urgent problem. This paper illustrates a surface acoustic wave (SAW) motor for two-dimensional positioning. The SAW motor include a SAW stator and a slide. In order to realize the two-dimensional moving, four Interdigital Transducer (IDTs) are fabricated on the four directions of a 0.5-mm thick, 128°YX- LiNbO3substrate. Comparing the aluminum material, the copper material selected to be used as IDT in our experiment has many advantages. Each of the four copper IDTs has 10 straight finger pairs in a simple repeating pattern, the IDT aperture is 10mm and the pitch is 400μm. The SAW stator is fabricated by the lift-off process. The dimension of the device is 29mm (width) X29mm (length). The slide consists of three ruby balls with the diameter of 1mm and an plastic disc with the thickness of 0.5mm and the diameter is 8mm. With the four radio frequency driving sources, two-dimensional motion is possible. The maximum speed of the slide that was placed on the SAW propagating surface was 5mm/s when the applied driving power was 28W and the applied driving frequency was 9.6MHz. The experiments indicate the two-dimensional motor based on SAW would be applicable to miniature motor and improve the resolution.
A Micro Spatial Light Modulator Based on Leverage Principle
Authors: Ren Hao , Ni Zu Gao , Chen Jian Ming , Gong Ai Ling , Yao Jun
Published: July 2011

This paper presents a novel out-of-plane micro spatial light modulator (μSLM) based on leverage principle. Design principles and analytical models are both developed and verified by Finite-Element-Analysis (FEA). The μSLM consists of four individual actuators, each actuated by electrostatic attractive force to produce a downward displacement, and this displacement is magnified to be a large displacement at the mirror by the lever principle. Compared with conventional electrostatic μSLMs, the stroke of proposed design can be remarkably increased. Then the optimization of the design is also given to produce largest out-of-plane stroke. The mirror is 500μm by 500μm by 1.5μm and the lever is 200μm by 30μm by 2μm. As large as a 4.5μm stroke is obtained by simulation and the resonant frequent is about 4.8 KHz.
The Design of AlGaN/GaN HEFT-Micro-Accelerometer and Temperature- Dependence Electrical Performance
Authors: Liang Ting , Tang Jian Jun , Zhang Qian Qian , Wang Yong , Li Jing , Liu Jun , Xiong Ji Jun
Published: July 2011

In this paper, We use a novel principle to detect acceleration and report how I-V characteristics and piezoresistance coefficient of AlGaN/GaN HEFT-micro-accelerometer are affected by setting different temperatures. It is shown that saturation current of device would go down if the temperature goes up, which is about 0.028mA/°C, based on the research. However, the device can work well at the temperature range of -50°C to 50°C, which indicates that it can work safely in the larger temperature range.
Improve Blood Clotting Feature of Silicon Microneedle by Silver Coating
Authors: He Yang , Jiang Cheng Yu , Liu Zhen Ya , Ren Sen , Chen Jun , Yin Heng Xu , Yuan Wei Zheng
Published: July 2011

Microneedles have broad applications in biomedical and neural measurements, drug-delivery systems, and microbiological sample analysis. Blood compatibility is required when microneedle is used in blood related field. We proposed a method to improve the blood clotting feature of silicon microneedle by silver coating. We fabricated the silicon microneedle with and without silver coating by wet etching and metal sputtering and implemented the clotting test. The clotting test results indicated that silver coating plays more important role to improve the blood compatibility of silicon microneedle than surface structure.
Characters of Particles in Copper-Water Nanofluids Made by Novel One-Step Aqueous Reduction
Authors: Huang Jun Sheng , Nie Yu Ying , Chen Ying
Published: July 2011

Copper-water nanofluids were obtained by a novel one-step KBH4 aqueous reduction of copper sulfate with complex compound EDTA-2Na and quaternary ammonium cationic dispersant C16H33(CH3)3NBr (CTAB). The average particle size of the nanofluids with 4g CTAB in 200ml solution was only 1.02nm measured by dynamic light scatter particle size analyser. The obtained powders centrifuged were pure copper mostly and contained a litter Cu2O which were influenced by the chemical reaction of complex compounds EDTA-2Na.