bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on Analysis of Deposits Highway Slope Stability and Treatment
Authors: Feng Yi Fang , Zhang Hua Zhi
Published: September 2011

Taking Yangjiawuchang Bridge 2 Slope Project on the national key high line of Hangzhou to Lanzhou in China as example, the deformation characteristics of typical profile 4-4’ of the deposits highway slope project was studied by means of numerical simulation (FLAC3D). Based on the deformation fields, the slope deformation features were analyzed. According to the slope coefficient that was solved by strength reduction method, the slope stability was evaluated. In consideration of numerical simulation results and field geological conditions, the combination engineering treatments of surface drainage, paring-earthwork and unloading and slope temporary protection were selected. Moreover, the paring-earthwork areas were calculated and optimized. The simulation results can be based on to guide the engineering treatment, meanwhile, the results can provide reference for the similar engineering.
Prediction of Free Edge Stresses in Laminate Systems Using Multi-Dimensional Method Based on Higher-Order Modeling
Authors: Ahn Jae Seok , Kim Seong Do , Chang Chun Ho , Lee Dong Woo , Woo Kwang Sung
Published: September 2011

This paper presents efficient modeling technique using multi-dimensional method for prediction of free edge stresses in laminate plates. For the efficient modeling, the p-convergent transition element based on two-dimensional layer elements is proposed in order to connect discrete layer elements. The elements considered are on the basis of subparametric element concept. The results obtained by this proposed model are compared with those available in literatures. Especially, three-dimensional out-of-plane stresses in the interior and near the free edges are evaluated. The present models using the p-convergent transition element are demonstrated to be more practical and economical than previously p-version FEM using only single element type.
Displace Regulation of Gauss Coordinates Based on Ellipsoid Expanded Modal
Authors: Jin Li Xin , Wang Lian Jun , Yang Song Lin
Published: September 2011

This paper studies on deducing the analytic formulae on Gauss coordinates displacement before or after the increase of major radius of ellipsoid expanded modals, which is based on the partial derivatives of geodetic coordinates in Gauss coordinates deducing from direct solution formulae of the Gauss projection coordinates in conjunction with differential coefficient formulae and variable of geodetic coordinates. On this theoretical foundation, analyzing the relationships between Gauss coordinates displacement and other mathematical parameter . The relationship of graphics between point displacement components of latitudinal coordinate dy and longitudes is similar to the straight lines. The relationship of graphics between point displacement components of longitudinal coordinate dx and latitudinal coordinate dy, and the geodetic height is similar to the straight lines.
Numerical Simulation of Driven Piles in Alluvial Soil
Authors: Hsu Shih Tsung
Published: September 2011

This study developed a numerical method to establish a comprehensive load-settlement curve for a driven pile. Analysis results shown that the residual forces caused by the driving of the pile can be simulated using the numerical method that proposed herein. The load was applied to the tested piles, while the incremental displacement was subjected to numerical piles. Although these two processes are distinctive, the load-settlement behaviors of various piles calculated numerically are consistent with those measured from field tests. Moreover, the proposed numerical method highlighted the post-peak behavior of a pile. Accordingly, the numerical method was very suitable to analyze the behavior of driven piles.
Strength Characteristics of Natural Rock Mass and its Engineering Application
Authors: Miao Jin Li , Nie Wen
Published: September 2011

All rock mass engineering projects are closely related to rock mass material property. The methods of obtaining these properties decides the project design’s safety and reasonable. The varied characteristics of rock mass under force are subjected by their texture, construction and tectonic history. The experimental results imply that the rock mass strength, deformation and failure modes are all effected by following aspects, including the test controlling method, machine stiffness and the sample size, etc,. In order to use the test results to guide the practice projects, we must first know the natural status and engineering propagation process of rock mass, then design suitable experimental scheme, subsequently, the more fit for the natural results of rock changed process will be appear. According to the analysis of previous research achievement and newly test results, we can investigate the rock mass stability and predict its failure.
The Substantial Base of Water-Salt’s Migration in Dispersive Saline Soil and its Influence on Geotechnical Engineering
Authors: Zhang Ling Ling , Fan Jian Hua , Zhang Yan Ge
Published: September 2011

This paper is based on a series of experiments on saline soil which is sampled from the west of Jilin province. Through analysis of the properties of material composition, we reveals the inner connection between the dispersivity of saline soil and the soil’s practical environment and material composition, which has theoretical and practical significance in engineering practice and study of saline soil’s dispersivity in this area .This paper will help us fully understand the characteristics of dispersive saline soil and the way it behaviors in engineering for taking the feasible engineering countermeasures to cope with saline soil and engineering accidents caused by the dispersivity of saline soils. The results of this paper will bring engineering applications of dispersive saline soil to a new level.
The Stability Analysis of Deep Foundation Pit Engineering Support and Field Testing Research
Authors: Zhang Xiang Dong , Liu Zhi , Liu Xi Jun
Published: September 2011

In order to study the foundation pit supporting structure displacement of the change rule and different parameters on the transverse displacement effect of pile. My research based on supporting structure engineering of Shenyang Washington. We use the software ADINA as a research tools to establish a finite element model. We simulated and analyzed the displacement with and without anchor. Results show that adding anchor supporting played a very good supporting effect, and the simulation results and actual test results compared and analyzed proved reasonable and simulation design scheme was feasible, this excavation has some guidance for the engineering and a certain reference for similar deep foundation pit bracing. [1]
The Research on RhodamineB Degradation in MW/H2O2 System under Alkaline Environment
Authors: Yuan Nan Nan , Hong Jun
Published: September 2011

In this work, the degradation of Rhodamine B by hydrogen peroxide under microwave irradiation is studied and the optimum conditions are designed by single factor experiment. The UV-VIS spectral changes of RhB solution is detected under the optimum conditions. The results indicate that microwave induction can efficiently improve the oxidative degradation of RhB by hydrogen peroxide in alkaline solution, espcially the dye has the best photodegradation efficiency more than 99% when the concentration of RhB was 300mg/l and the pH of solution was 12 after irradiated for 10min, It is better than RhB under visible irradiation in alkaline environment with hydrogen peroxide. The solution initial pH has no effect on the temporal absorption spectral of RhB. The process of reaction conforms to the first-order kinetic equation.
Numerical Analysis of Rain-Wind Induced Vibration on Conductor by Finite Element Method
Authors: Zhou Chao , Liu Yan Ping
Published: September 2011

In the conditions of Rain-wind excitation, droplets suspended to the conductor within the strong electric field, which amplifies corona discharge and generate ionic wind. The ionic wind coupling with wind force induced vibration of the cable, which seriously affected the cable's normal operation of transmission and stability. Study on mechanism of corona discharge excitation, a finite element model of Rain-wind vibration is established based on the finite element theory and the Newmark algorithm. Take LGJ-240 as an instance, using experimental and numerical analysis to analyze the impact on amplitude of cable by the air humidity and density, conductor surface conditions, cable structure factors and tensions. Methods and conclusions in this paper can be used as references for designing UHV transmission liens, upgrading the existing lines and controlling vibration.
Statistical Macro- and Meso-Damage Study on Marble under Uniaxial Compression Based on SEM Equipment
Authors: Ni Xiao Hui , Li Xiao Juan
Published: September 2011

A meso-mechanical testing scheme based on scanning electron microscopy(SEM) is developed to carry out the experiment of microfracturing process of rocks. The microfracturing process of the sample on surrounding rock in immerged Long-big tunnel in Jinping Cascade II Hydropower Station under uniaxial compression is recorded by using the testing scheme. According to digital image processing theory, the meso-structural information of rock microfracture such as length, angle, area, etc are obtained from SEM images. Then, the meso-structural information of microfracturing process under uniaxial compress is analysized and the distribution regularities of microfracture parameters are generalized extreme value distribution with variable parameters. The process was described of the damage from the perspectives of macro-and micro-scale under the uniaxial compression loads.
Numerical Simulation of Gas Distribution and Mined Seepage Passage with the Pressure Relief of Short Distance Protective Coal Stratum
Authors: Zhang Yong Jun , Ma Nian Jie , Zhang Zi Min , Jia Tian Rang
Published: September 2011

With the full consideration of the heterogeneity, existing joints, and cracks in the rock, the coupled gas-rock model for investigating the failure process of coal-rock is established by introducing the related equations governing the evolution of stress, damage and gas permeability along with the deformation of coal and rock. A numerical approach of realistic failure process analysis (RFPA) to simulate the stratum movement, layer separation, the whole collapse progresses, and gas permeability changing of the protected coal seam is proposed. The numerical simulation results well displayed the whole processes of the cracks growth of gas seepage passage and the change of gas permeability for the closed distance protected coal seam. It can be seen from the distribution of acoustic emission in the space that the stratum failure is transferred from deeper to surface. By the analysis of the stress fields changing, the reasons of the gas permeability improvement of the protected coal seam are presented.
Research on the Damage Fracture of Rock Blasting Based on Velocity Response Spectrum
Authors: Sun Xin Jian , Sun Jian Sheng
Published: September 2011

The damage caused by blasting vibration on rock mass is an extremely complex process, and has certain impact on the mechanical properties and bearing capacity of the rock, which will affect the overall stability and safe operation of the construction. Therefore, studying on the damage effect of blasting vibration is very necessary. Taking Laxiwa hydropower station project as a background, the paper computed relative velocity response spectrum using monitoring and measuring blasting velocity as an excitation, then analysis was carried out to study the relationship between the depth of rock blasting and the integral value of relative velocity response spectrum as well as the index of cooperation of the integral value and the blast vibration’s duration time. The results show that using three-parameter (velocity, frequency, duration time) was clearly superior to two-parameter (velocity, frequency) on studying the damage fracture of rock blasting, and two-parameter was better than one-parameter (velocity) by analogy.
An Effective Evolutionary Algorithm for Analyzing a Realiability of Geotechnical Engineering
Authors: Zeng Wei , Wen Kai , Zhao Bao Quan , Zhang Guang Cheng , Zeng San You
Published: September 2011

The reliability index is not only nonlinear but also continuous, so we design the real coded genetic algorithm to improve the performance of the algorithm. The experimental results indicate that our method is 10 times faster than the binary-coded genetic algorithm, more accurate and stable than other methods.
Study on the Difference between Turfy Soil and Normal Peat Soil in China
Authors: Lv Yan , Nie Lei , Xu Kai , Su Zhan Dong
Published: September 2011

As the special soil, turfy soil and peat soil in China contained some similar properties with high void ratio, high water content, high organic content, etc. But turfy soil also had properties which difference from peat soil. In this paper, based on the formation of the cause and geological environment and geomorphologic characteristics of geological in the quaternary, took the typical and widespread turfy soil and peat soil regions for example, systematically discussed the material composition and macroscopic and microcosmic structural features, put further research on the physical chemistry mechanical characteristics. Then the come to the conclusion that the essential reason for difference between turfy soil and peat soil were decomposition degree and organic content. The result that worse engineering properties such as higher the moisture content, porosity, compressibility, internal cohesion and the lower specific weight, consolidation coefficient and permeability were due to the lower decomposition degree and higher organic content of turfy soil than peat soil. It can provide reference to the practical projects of turfy soil to distinguish peat soil according to this characteristic.
Approach of Concrete-Filled Steel Tube Ultrasonic Method Based on Ann
Authors: Xiao Yun Feng
Published: September 2011

The delimitation is a frequent and danger failure in concrete-filled steel tube. The ultrasonic testing is an important method of NDT and it is usually used in detecting concrete-filled steel tube’s flaw .The ultrasonic signal include time parameter, frequency parameter, amplitude parameter and waveform parameter . At the present time the detection is mainly based on time parameter,not included the other parameters.The frequency parameter is sensitive to flaw in detecting.The artificial neural networks (ANN) is applied in order to enhance the detection's accuracy standard. Inputting the ultrasonic signal's time parameter and frequency parameter as characteristic number, through training and learning,we can indentify the failure's style. Though carrying out the combined diagnosing system into practical testing, the approving quantitative results is gained.
Effect of Technological Parameters on Corrosion Resistance of Phytic Acid Coatings on 6063-Al Alloy
Authors: Lin Bi Lan , Xu Yu Ye , Yuan Zhi Chuan
Published: September 2011

Phytic acid coatings were formed on 6063-Al alloy during immersion in phytic acid solution with various pH and phytic acid concentration for different time. The corrosion resistance of the coated samples was investigated using Tafel polarization technique. The results show that the effect of technological parameters on corrosion resistance of phytic acid coatings is great. With the increase of pH, the corrosion resistance of the coated sample is firstly increased and latterly decreased; it is optimum when pH was 3.0. The corrosion resistance of phytic acid coatings is increased largely with phytic acid concentration and immersion time. The anodic and cathodic corrosion processes of the coated 6063-Al alloy are inhibited markedly, and the corrosion current density is decreased for more than two orders of magnitude.
Flexural Tests on the H-Section Simple Beams with Local Buckling
Authors: Kwon Young Bong , Cheung Jin Hwan , Kong Byung Seung , Lee Hwan Woo , Choi Kwang Kyu
Published: September 2011

This paper describes a series of flexural tests conducted on the H-section beams fabricated from SM490 plate of thickness 0.6mm with nominal yield stress 315 MPa. Flexural members with large width-to-thickness ratios in the flanges or the web may undergo local buckling before lateral-torsional buckling. The local buckling has a negative effect on the moment capacity based on the lateral-torsional buckling. Simple bending moment capacity formulas for flexural members were calibrated to the test results to account for interaction between local buckling and lateral-torsional buckling. The ultimate flexural strengths predicted by the proposed formulas for direct strength method were compared with the AISC (2005) and Eurocode3 (2003). The comparison showed that the moment formulas proposed can predict conservatively the bending moment capacity of H-section flexural members with local buckling.
Dynamic Response of Magnetorheological Fluid Damper for Automotive Suspension and the Influence by Long-Time Standing-Still
Authors: Zhang Hong Hui , Xu Hai Peng , Liao Chang Rong , Deng Zhao Xiang
Published: September 2011

Dynamic response is a key parameter for the engineering applications of MR damper. However, the response time has many different definitions, and which leads to a confusion of the measurement. Commonly, the response of MR damper in the new-designed status is focused, the instance after long-time use or standing-still has not been proposed. In this paper, the influence on the response time by the long-time standing-still is investigated, which shows that the response is largely lengthened. Next step, the measurement will be optimized, and the response of MR damper after long-time use will be in consideration.
Research on Producing New Ceramic Filter Media Modified at Surface and its Application in Pre-Treating Slightly-Polluted Water
Authors: Zhang Yan Qing , Li Meng
Published: September 2011

Using Fe (NO3)3 as modifying agent, a new porous environmental ceramic filter is modified at surface to pre-treat slightly-polluted water. It can effectively reduce organic substances in subsequent processes, thus enhance the quality of water output. The iron oxide / modified ceramic filter media was manufactured by heating vaporization, and the optimal modification conditions were as follows: pH value is seven, Fe (NO3)3 density is 2mol/L, and roasting temperature is 550 centigrade. Compared with plain ceramic filter media, the removal rate of COD was enhanced six to eight times. The surface morphology of filter media was inspected by SEM, which showed that the iron oxide film, being fine particles, was attached to the ceramic filter. This is beneficial for enhancing adsorption capability. The matter species of iron oxide film were analyzed by XRD, result showed that it contains α-Fe2O3 and α-FeOOH, which is helpful for adsorbing and removing organic substances in water.
Experimental Investigation on Composite Circular Steel Columns - Taguchi’s Approach
Authors: Kumar N. S. , Simha T.P. Sameera
Published: September 2011

Composite circular steel tubes- with and without epoxy infill for three different grades of concrete are tested for ultimate load capacity and axial shortening , under axial monotonic loading for compression. Steel tubes are compared for different lengths, cross sections and thickness. Specimens were tested separately after adopting Taguchi’s L9 (Latin Squares) Orthogonal array in order to save the initial experimental cost on number of specimens and experimental duration. DOE (Design of Experiment) approach was adopted. Results were generated using Taguchi’s method-a new technique to get mean effects plot. Analysis was carried out using ANOVA (Analysis of Variance) technique with the assistance of Mini Tab v15- a statistical soft tool. Results were verified after conducting preliminary nine combination experiments as per L9 orthogonal array and linear regression models were developed. Comparison for predicted and experimental output is obtained from linear regression plots. To know the implications of different factors on circular composite columns with and without epoxy, surface contours were also generated. From this research study it is concluded that ,Regression models which were developed with minimum number of experiments based on Taguchi’s method predicted the axial load carrying capacity very well and reasonably well for at ultimate point. Cross sectional area of steel tube has most significant effect on ultimate load carrying capacity. Also it is observed that, as length of steel tube increased- load carrying capacity decreased.
Study on High Thermal Conductive BN/Epoxy Resin Composites
Authors: Wang Hui , Chen Peng , Sun Jian , Kuang Xiao Jun , Yao Zhen Kun
Published: September 2011

In contemporary electronic technology era, the volume of electronic equipment and printed circuit board reduced so dramatically that the requirements of heat dissipation and insulation increase thereafter. In this research, γ-aminopropyltriethoxysilane (KH550)-treated boron nitride (BN) powder was used as a filler to modify epoxy composites. Effects of the BN particle size and concentration on the thermal conductivity of composites were investigated. SEM image showed the treated BN filler dispersed well in the composite matrix. Moreover, the thermal conductivity was enhanced as the BN concentration was increased. Similar phenomenon was also observed when the filler particle size was reduced. Results indicated that with increasing amount of BN addition, the composites’ thermal conductivity showed a nearly linear increase. When the mass fraction of BN was 30% and its particle size was 220 nm, the thermal conductivity reached 3.4 W/(m•k), which was 17 times as high as that of pure EP resin.
Experimental Study of Particle Collision Damper for Vibration Attenuation
Authors: Liu Di , Wang Shu Lin , Du Yan Chen , Li Hai Chao , Sun Yin Zhang
Published: September 2011

In cantilever beam system, through the experimental method to study vibration reduction mechanism of particle collision damper. The filling rate of particle damping agent in damper is 40%, added the damper with different diameter impacters and different kinds of particle damping agent in combinations ways, the cantilever beam system obtained the varying vibration reduction, according to the quality of vibration reduction, analyzed the joined impacters and particle damping agent influence of vibration attenuation rule. Experimental results show that damper added impacters and particle damping agent can dramatically reduce the maximum amplitude of cantilever beam system in resonant frequency, and can effectively restrain vibration of cantilever beam system.
Synthesis and Characterization of Silylated Kaolinite/Silica Core–Shell Nanoparticles
Authors: Zhang Qian , Zhang Bai Mei
Published: September 2011

Studies were conducted on the production of silane modified kaolinite/silica core-shell nanoparticles (SMKS). The SMKS nanoparticles were prepared via the sol–gel technique using tetraethyl oxysilane (TEOS) as the precursor to form silica shells on the surface of kaolinite particles followed with silane treatment. TEM of the unmodified kaolin (ORK) and SMKS revealed that a layer of ultrafine silica particles were deposited on the kaolinite surface to form a new kind of core–shell structure particles.
The Effect and Characterization of Modified Asphalt by Coupling Agent
Authors: Liang Xin , Guo Xue Dong , Wang Hao , Yu Xue Song
Published: September 2011

The study uses distilled water as test liquid, investigates the wettability of modified asphalt with silane coupling agent DB-570 by sessile drop method, measures the contact angel of modified asphalt with different amount of coupling agent based on LB-ADSA model by ADSA software, and also calculates the surface tension of modified asphalt. The study analyzes asphalt membrane by SEM. The results show that the static contact angle of distilled water in the surface of modified asphalt increased with the addition of coupling agent, the adhesion of asphalt and aggregate enhanced after modification, the asphalt membrane become much more complete.
Investigation on Tungsten Needle pH Sensor Modified by Polyaniline Film and its Applications to the Crucian pH Detection
Authors: Wang Chao Jin , Cai Gui Mei , Zhang Jin Yin , Du Shuan Xia
Published: September 2011

Abstract A tungsten electrode modified with polyaniline was prepared as working electrode, the platinum wire electrode for counter electrode, and the saturated Ag/AgCl redox system for reference electrode, with the base on solution H2SO4 (1.5mol/L) vs. aniline solution 0.1mol/L. The sensor showed a Nernst response in the pH range of 2~12 and a response time less than 1 min. Connected the tungsten filament electrode and silver wire electrode (mentioned above) to the anode and cathode of the pHS-25 type pH meter respectively, inserted the electrodes to the measured positions of the sample, and then recorded the potential reading when the potential value was stable, the results would be quantified by the curve (E-pH curve) finally.The sensor has been successfully employed to determine pH in the crucian from the live fish to the putrefied fish.
Acoustical Design and Measurement in Surround Sound Classroom
Authors: Li Yi Hong , Yang Ai Ying
Published: September 2011

This paper covers the requirement and measurement of sound quality in the surround sound classroom. Based on the characteristics of the sound field, this paper specially deals with the design of acoustics requirement of the characteristics of reverberation frequency and sound propagation. In order to meet the requirements of recording in signal to noise ratio, comprehensive methods in noise decrease are adopted in design, which include the reduction of noise in room background. Through the checking of the testing data and the evaluation of the users, various acoustics norms meet the requirements of acoustics and the demands of the using.
Visualization Research on Heat Pipe Radiator in Cooling Electronic Apparatus with High Heat Flux
Authors: Zhao Zhong Chao , Ye Rui , Chen Yu Ping , Zhou Gen Ming
Published: September 2011

In this paper, the heat transfer characters of heat pipe radiator for cooling electronic device with high heat flux were investigated by visualization method. The surface temperature of heat pipe radiator was measured at different heat flux and constant fan speed of 0.7m/s, and the results show that the surface temperature of electronic apparatus is below 75°C for the heat flux 8W/cm2 at constant fan speed of 0.7m/s; The error in measured value using thermocouple and technique of infrared thermography was analyzed based on the principles of temperature measurement of infrared thermal imager.
Element Grouping Method for the Calculation of Dynamic Response and Acoustic Radiation from an Underwater Structure
Authors: Ji Gang , Zhou Qi Dou , Huang Chun Wen
Published: September 2011

A modification of traditional FEM/BEM called element grouping method (EGM) is proposed to calculate the elastic vibration and acoustic field radiated from an underwater structure. Instead of rebuilding the structure using coarse FEs to save the computational time and data storage, the structural FEs on the coupled surface are grouped into clusters of BEs to reduce the number of fluid DOF. With the grouped elements (GEs) used as BEs, the problem of non-matching between fluid DOFs and structural DOFs is solved. The approach is illustrated and validated using known analytic solutions for submerged spherical shells subjected to uniformly applied incident pressure. Acoustic radiated from a ribbed cylindrical shell driven by a force is predicted by using different element grouping styles. Comparison between numerical and experimental results shows that fine grouped elements give a high computation efficiency and more efficient data storage saving.
EMAT for Coiled-Tubing Wall Thickness and Ovality Measuring
Authors: Zhou Zhao Ming , Wan Fu , Wang Lei , Lian Zhang Hua , Chen Yong
Published: September 2011

This paper presents a new wall thickness and ovality measuring method engineered for reliable field use. This paper describes the electromagnetic ultrasonic technique in coiled tubing detection. This paper describes requirements for Coiled Tubing specifications, which measuring different parameters, some of which include diameter, ovality, and wall thickness. This method not only thickness measurements but also ovality measuring will be made. This article discusses the electromagnetic ultrasonic thickness measurement of the system components, and experimental tests have shown. Ovality measurement sensor layout is designed. This paper discusses the development of this new methods, this system is suitable for non-contact, real-time, on-line high-speed data measurements.
The Approach of Cutting Attack Resistant Color Image Watermarking
Authors: Ding Li Jun , Feng Hao , Zhao Hao
Published: September 2011

This paper proposed a new method of cutting attack resistant for color image. The RGB image based on three-color theory was transformed and mapped into the real/complex space, which was composed of intensity-number space and color-number space. The watermark information was embedded into the principle component data of intensity-number space, which was extracted by SVD method. And the color image was attacked by 5 types cutting, the extracted watermarking information image had high value of peak signal-to-noise ratio (PSNR), moreover, it also had the similarity value between the original watermark and the extracted watermark. The experiment results demonstrated its’ robustness, effectiveness and rationality.
Research of Multi-Sensor Integration System for Train Speed and Position Measurement
Authors: Zhou Yu Wei
Published: September 2011

The speed and position measurement is an important part of the train control system. Accurate measurement of train speed and position ensures safety of train running and improves transportation efficiency. Traditional methods to measure speed and position usually rely on single sensor, which has less accuracy and reliability. A method of measuring train speed and position based on multi-sensor fusion is proposed in this paper. Since trains are running on fixed rail tracks, the position of train can be determined by the traveled distance and speed monitoring is essentially to measure the magnitude of train velocity. According to this characteristic, this measurement system consists of axle odometer, Doppler radar, accelerometer and intermittent inquiry balise. The federated Kalman filter is used to implement multi-sensor fusion. Simulation experiment results prove that this method can improve the accuracy and reliability of train speed and position measurement.
Design of Information Terminal for PHM Based on Multi-MEMS Sensors
Authors: Li Qi Chang , Wang Guang Long , Wang Zhu Lin , Zhang Shan Shan
Published: September 2011

In order to accomplish the Prognostics and Health Management System(PHM) for guided missile, sensor network node of storage and conveyance’s environment’s monitoring based on multi-MEMS sensors is designed. Centering on the low power consumption singlechip, microsensor collecting the information of temperature, humidity, acceleration(calculate quiver), and magnetic field intensity(calculate posture), realizing the wireless communication between the node and the upper management system (ARM controller) with the radio frequency send-receive chip nRF2401. This node has the characteristic of small volume, easy to layout, low power consumption, continuous operation for long time and so on. It preferably realized the function of information terminal of PHM system.
The Minimum Zone Evaluation for Sphericity Error Based on the Dichotomy Approximating
Authors: Lei Xian Qing , Song Hong Wei , Zhou Jia
Published: September 2011

A new algorithm which is “the minimum zone evaluation for sphericity error based on the dichotomy approximating” has been presented with the geometric characteristics and research situation of sphericity error and through the understanding of the definition and the evaluation problem of the sphericity. The principle of the algorithm is that based on finding the initial point of the ball as the base, around which the side decorates cube by certain length, calculating the distance of the points on the sphere to the cube measuring points of the eight vertex and the initial point, by comparing and judging to find a new beginning starting point, and arrange new cube repeatedly until meets the requirement. The sphericity error value of corresponding evaluation method (Minimum Zone Sphere method (MZS)) was obtained according to that. The mathematical formula、program flowchart and example verification were given. The example verification results show that the sphericity error can be evaluated effectively and exactly with this algorithm.
Study on Four Different Vegetation Types Treating the Sanitary Sewage
Authors: Zhou Ming Tao , Yang Ping
Published: September 2011

The sanitary sewage is treated with four different vegetation types by means of artificial surface runoff. Results show soil+ Cynodon dactylon L. + Festuca arundinacea Schreb is the best vegetation type in treating the sanitary sewage, and the total removal of it is 80.24% TN, 62.99% TP, 74.85% BOD5, 39.73% COD and 58.64% TOC respectively in the course of trial, which indicates that the mixed vegetation type made up of plants and soil is better than the pure soil vegetation type, and the complementary collocation of complex plants is better than the single plant.Five water-quality indexes of the sanitary sewage removed by the single vegetation type are also studied, and it shows that there are some differences among them from high to low as follows: TN>BOD5>TP>TOC>COD.
A Study of Temperature Dependence for Capacitive Pressure Sensor
Authors: Lv Hao Jie , Hu Guo Qing , Wang Xing Ye
Published: September 2011

In order to reveal the temperature dependence of a touch mode capacitive pressure sensor, temperature dependence of material parameters of the sense have been studied. Using Finite Element Method (FEM) to simulate and solve capacitance, the results show that the relation of capacitance and temperature is almost linear in touch state of the sensor. At the same time, temperature sensitivities under different pressure are slight difference, which are 0.0056pF/K and 0.0040pF/K, respectively. Therefore, the high-temperature performance of the sensor is greatly outstanding.
Finding Suitable Indexes to Detect the Locations of Omitted Spot Welds in Structural Joints Using FE Model and Modal Parameters
Authors: Jahani Kamal
Published: September 2011

Resistance spot welding is one of the mostly used methods in joining different pieces of complex sheet metal structures such as automotive BIW. Some manufacturing inaccuracies, accessibility difficulties to some locations and large quantity of spot welds, may lead to missed out substantial number of spot weld connections. In present work, it is tried to find suitable Indexes to detect the locations of omitted spot welds in a structural joint using finite element method and modal analysis. Two different special modal indexes derived that can be used to detect the missed out location of a spot weld in a lap joint of two flat plates. One modal index derived from computations on high range natural frequencies of the structure and the other one was achieved by searching on a special case of MAC values of modal vectors at joint region. Finally, using artificial neural networks and the developed indexes in present work, the location of an absent spot weld in the investigated structure detected successfully.
Nonlinear Measurement Data Processing Based on Improved Damping Least Squares
Authors: Li Gui Ling
Published: September 2011

Datum are the key of “Digital Earth”.In measurement, dealing with nonlinear models of observation datum, we may take their approximate values at observation values by Taylor series expansion, say, taking first-order item as a linear function of classical adjustment. But requirements of observation data, processing and accuracy assessment are higher and higher with today's fast-growing of high-tech mapping and surveying. So study on nonlinear least squares adjustment has been paid more and more attention. Damping least squares, as a modified algorithm of Gauss-Newton’s algorithm, is necessary to add a damping factor to improve the nature of a coefficient matrix. But it is difficult to choose a suitable damping factor, and needs to solve a group of linear equations repeatedly. In this paper, an improved damping least square was utilized for the non-linear processing of measurement datum in order to reduce a lot of computational workload.
Drop-Weight Impact Measurement System Based on LabVIEW
Authors: Cao Xiang , Yu Zhe Feng , Wang Hai
Published: September 2011

A data acquisition (DAQ) system for the low velocity impact tests is presented. The DAQ system is comprised of transducers, DAQ card, personal computer and self-manufactured impact equipment. The whole impact signal acquisition system has capability of sampling time history of contact force and optical signal which is employed to calculate the falling velocity, and it also generates the control signal for the equipment which catches the drop-weight after its rebound. The test data are presented, which shows the proposed DAQ system is applicable to the test setup for low velocity impact damage pre-set of composites in the aircraft structural industries.
Evaluation Method for Measurement Uncertainty of Antenna Surface Accuracy
Authors: Li Gan , Li Zong Chun , Lu Shu
Published: September 2011

This paper describes the basic data process of antenna surface geometrical measurement and the quality evaluation indexes, which are surface accuracy and its uncertainty.The peak to peak value of normal deviation is used to characterize the surface accuracy,and its deviation is defined as its uncertainty.The measurement errors are given under repeated measuring conditions.Under repeated measuring conditions,the simulation method is that adding the measurement errors calculated by repeated measurement to theoretical coordinates.Under single measuring conditions, the first step is to convert the measurement data from the measuring coordinate system to the design coordinate system to get the transformation parameters;then use these parameters to convert theoretical coordinates to the measurement coordinate system;and then add measurement errors to transformed coordinates for simulation.The key point is adding measurement errors to the data which do not contain measurement errors.The simulation and actual measurement experiments of a Φ0.7 meter antenna were conducted,which showed that the method is correct.
Design and Research of Digital Decimation Filter Based on FPGA
Authors: Li Yao
Published: September 2011

This paper studies and analyses various digital filter and decimation structure. On this basis, by using QUARTUS development system design the decimation device modules, through the waveform simulation validated its correctness. Finally,a program is written into FPGA chip by the hardware platform. In the digital down conversion (DDC), CIC (cascade integral comb) filter plays an important role. It is mainly used for sampling rate, as well as low-pass filter effect. The main characteristics of CIC filter, using only adders, subtractor and register (no multiplier), so fewer resources occupied, implementation is simple and high speed. Based on the analysis of the principle of CIC filter,simulate and synthesize based on the theory of using VHDL language in FPGA. And successful application in the development of DDC chip.
Keyword: CIC (cascade integral comb) filter,FPGA,VHDL
The Properties of Flue Gas Desulphurization (FGD) Gypsum
Authors: Hao Run Xia , Guo Xiao Yan
Published: September 2011

The properties of flue gas desulphurization (FGD) gypsum were analysized by Thermo-gravimetry/differential scanning calorimetry (TG/DSC), technical performance analysis, optical microscope and Scanning electron microscope (SEM). Mechanical properties of FGD gypsum-steel slag powder cementitious material were researched. The results revealed that FGD gypsum have similar moisture content, major component CaSO4·2H2O with natural gypsum, and has better technical performance than natural gypsum. The results of optical microscope and SEM of the FGD gypsum hydration support this further. When the dosage of steel slag powder is 15%, containing activator ,better mechanical properties can be obtained. Key words: FGD gypsum, Property, Cementitious material
Study of 3D Sound of Airport Crash Fire Vehicle Simulator
Authors: Wang Li Wen , Shi Dan Dan , Wang Hao
Published: September 2011

Airport crash fire vehicle simulator is an important device that is used in training of the airport firefighters, which has advantage of safe, energy saving and decreasing training cost. Sound system is an important part of airport crash fire vehicle simulator, which provides voice message to training personnel, which can make training personnel have immersed sense. Based on the principles of sound source position to analyze the different physical structure of the human body (head, torso, pinna) the impact of sound localization, the establishment of head-related transfer function model, using the model of the sound source, filtering, delay processing, and virtual sound source. And we have tested and verified with listening experiment.
Study on Road Traffic Condition Identification Based on Floating Taxi
Authors: Yao Xin Sheng , Qu Jian Hua , Ying Ji Lai
Published: September 2011

This paper describes a prototype system based on floating taxi for traffic condition identification. The system consists of in-vehicle hardware units placed in floating taxi and backstage database that process all data send from the report units. The communication between the taxi and the database center is based on a very compact wireless communication protocol. The taxi sample size is decided by the variables: section traffic information update cycle, data sampling interval, section covering ratio. The test in a road section showed that the system is operational which could offer useful reference for urban traffic management and resident trips decision.
Total Labelling of the Tree
Authors: Sun Hai Na
Published: September 2011

. The (2,1)-total labelling of the tree has been widely studied. In this paper we study the (3,1)-total labelling number of the tree. The (3,1)-total labelling number of the tree is the width of the smallest range of integers to label the vertices and the edges such that no two adjacent vertices or two adjacent edges have the same labels and the difference between the labels of a vertex and its incident edges is at least 3. We prove that if the distance of the maximum degree in the tree is not 2, then the (3,1)-total labelling number is the maximum degree plus 3.
A Clonal Selection Algorithm Based Optimal Iterative Learning Control with Random Disturbance
Authors: Hao Xiao Hong , Gu Qun
Published: September 2011

Clonal selection algorithm is improved and proposed as a method to solve optimization problems in iterative learning control. And a clonal selection algorithm based optimal iterative learning control algorithm with random disturbance is proposed. In the algorithm, at the same time, the size of the search space is decreased and the convergence speed of the algorithm is increased. In addition a model modifying device is used in the algorithm to cope with the uncertainty in the plant model. In addition a model is used in the algorithm cope with the uncertainty in the plant model. Simulations show that the convergence speed is satisfactory regardless of whether or not the plant model is precise nonlinear plants. The simulation test verify the controlled system with random disturbance can reached to stability by using improved iterative learning control law but not the traditional control law.
Analysis of Reasons with the Entity for the Evaluation of the Environmental Protection Performance of the County Party and Government Leaders
Authors: Zhou Jing Kun , Zhang Qiao Mei , Yu Bing Cai
Published: September 2011

Establishing the evaluation entity scientifically is very important to regulating the environmental protection behaviour of the party and government leaders of counties and municipalities ("hereinafter referred to as "the leaders") and motivates them to protect environment. The article points out that, there is problem with the entity for evaluation of the environmental protection performance of the leaders; for example, the entity is too single; the structure of the entity is unreasonable; there is a lack of independence; the information is unsymmetrical; the entity lacks professional ability and knowledge; the scope of public participation is limited; this is because of the lack of service awareness on the part of the leaders, the public's insufficient participation under the influence of traditional culture, institutional barriers, relatively closed evaluation system, and less theoretical research and practice exploration of the evaluation entity.
Application of the Vibration to the Top Coal Caving
Authors: Jian Xuan Xiang , Yang Yong Jun , Lin Yi
Published: September 2011

The article discussed the advantages and disadvantages of the traditional long wall top coal caving (LTCC) first, then proposed a new technique of top coal caving with vibration. The theoretical basis of the technique was elaborated.The top coal vibration system and its control system have been designed as such when the system works, the emulsion pump station provides power for whole system, the current pulse generator provides current pulse. This technique has been applied to the 5209 top coal caving working face in Wang Zhuang coal mine (Shanxi Province). Based on the experiment, the vibration can easily destroy the arch structure which is formed during the top coal caving process. The top coal caving with vibration technique has a higher coal recovery ratio. This technique improves the top coal broken effect and lowers the waste content rate. The significant economic and social benefits proved it to be a promising technique.
The Study of Tire Pattern Noise by Using Wavelet Transform
Authors: Hwang Sung Wook , Han Jin Hyuk , Sung Ki Duck , Lee Sang Kwon
Published: September 2011

Tire noise is classified by pattern noise and road noise in a vehicle. Especially pattern noise has impulsive characteristics since it is generated by impacting of tire’s block on the road. Therefore, a special signal process is needed other than traditional Fourier Transform, because the characteristic of signal is varying with time. On the other hand, the pattern noise is a kind of non-stationary signal and is related to the impulsive train of pitch sequence of a block. In this paper, Wavelet Transform is applied to verify the impulse signal caused by impact of block and groove and to verify the relationship between the pattern noise and the train of pitch sequence.
Numerical Analysis of Shock Wave Propagation Law of Internal Gas Explosion
Authors: Zhang Xiu Hua , Wu Yan Yan
Published: September 2011

The purpose of this paper is to research on shock wave propagation law of internal gas explosion. The multi-material Eulerian and Lagrangian coupling algorithm was adopt. Using ANSYS/LS-DYNA dynamic analysis software to build frame structure, air and gas explosion models. Multiple ALE elements for simulating air and gas explosion material the analysis of blast shock wave propagation in a three-story steel frame structure and the characteristics of explosion pressure using fluid-structure coupling method are carried out. The conclusions show that fluid-structure coupling method can well simulated shock wave propagation of internal gas explosion, and the pressure peak of blast shock wave increased with the increasing of the blast air initial energy. Locality is the characteristic of explosion pressure in sealed space, and the pressure pass weakly when it propagates in solid.