bluuebunny/crossref_metadata_2025 huggingface dataset:
A Novel Anti-Fuse Based on (Ba, Sr)TiO3(BST) and Pb(Zr, Ti)O3 (PZT) Thin Films
Authors: Tang Qian Ying , Liu Yuan , He Ya Fan , Li Ping , Xie Xiao Dong , Wang Gang
Published: July 2012

This paper presents a new application of (Ba, Sr)TiO3(BST) and Pb(Zr, Ti)O3 (PZT) thin films in anti-fuse and their resulting anti-fuse behaviors. Compared with amorphous silicon, BST and PZT anti-fuses demonstrate distinct advantages: lower on-state resistance and lower breakdown electric field. With the sandwich-like structure of Pt/Ferroelectric Ceramics/Pt, the devices exhibit an apparent anti-fuse behavior. The resistivity of BST structure switches from 6.7 MΩ to 12.3 Ω at the average breakdown electric field of 0.3 MV/cm, while the PZT structure switches from 106 MΩ to 10.7 Ω at the average breakdown electric field of 1.3 MV/cm. Finally, the prospect of using BST and PZT is discussed and suggestions for their improvements are proposed.
Fiber-Optic Electric Field Sensor Based on Electrostriction Effect
Authors: Zhao Juan , Zhang Hui Yuan , Wang Yin Shun , Liu Hong Wei
Published: July 2012

This paper presents a new method for measuring AC field strength, with application of electrostriction effect of electrostrictive ceramics and technology of fiber Bragg grating. We use electrostriction effect to design the fiber-optic electric field sensor. This device turns the strain of electrostriction material influenced by electric field into the strain of fiber Bragg grating, then wavelength of feedback changes. We can get the strain of electrostriction material through the comparison between initial wavelength and wavelength of feedback, then measurement of electric field strength can be achieved by detecting the strain of electrostriction material. Experiments indicate that fiber-optic electric field sensor based on electrostriction effect is of effective value for measuring electric field strength, and the response of measuring system to AC electric field is linear. We apply an effective method for the research of measuring electric field strength.
Life Prediction for Silicon Pressure Sensor Based on SVR
Authors: Zhai Zhi Hua , Wu Ping Li
Published: July 2012

In order to improve the reliability of silicon pressure sensor, life prediction for silicon pressure sensor should be performed. Life prediction for silicon pressure sensor based on support vector regression is proposed in the paper. Grid method is used to determine the parameters of support vector regression in the process of training support vector regression model. Life for silicon pressure sensor under the conditions of different pressures is given in the experimental analysis. The comparison of the errors and mean errors between support vector regression and BP neural network indicates that life prediction accuracy of support vector regression for silicon pressure sensor is higher than that of BP neural network.
Synthesis of an Oxidation Resistant Coating for Ni-Based High Temperature Structural Materials by Dip Coating
Authors: Chen Wan Ting , Wu Rudder T. , Chien Karen , Wu Liberty T. , Gao Hong , Harada Hiroshi
Published: July 2012

High temperature structural materials are becoming increasingly important under the growing demand for stronger materials to work under the aggressive operating conditions of modern gas turbine engines. Alongside the mechanical strength, surface protectiveness of these materials is also of great importance in order to maintain the originally designed microstructure and chemistry. For coating scientists and engineers, a simple and effective method of making surface oxidation- and corrosion- resistant is always preferred. In this study, oxidation resistance of a coating system prepared by means of dip coating is investigated. Cross-sectional morphologies of the dip coated specimens before and after thermal cycling are also characterized using a scanning electron microscope.
Thermodynamic Evaluation and Assessment of the Ti-U Binary System
Authors: Cao Zhan Min , Wang Kun Peng , Du Guang Wei , Qiao Zhi Yu
Published: July 2012

The thermodynamic description of the Ti-U binary system is obtained by the CALPHAD method using Thermo-Calc software and based on the estimated thermodynamic properties using ion-bonding model and Miedema model as well as the experimental phase diagram information. The liquid, αU, βU, δTi, and γ phases are assumed to be substitutional solutions with Redlich-Kister formula for the expressions of their excess Gibbs energy. The intermetallic compound TiU2 is treated as a stoichiometric compound. The calculated phase equlibria are in good agreement with the estimated and available experimental phase diagram data.
Design and Implementation of SCM-Based Smart Cars
Authors: Lin Mei , Zhang Yu Mei , Cui Li Gong
Published: July 2012

With the background of the higher vocational college students' innovative of 2010 national test plan, This paper introduces an intelligent controlling system of smart car. Which takes the STC89C52 single-chip Microcomputer as the core of control and black and white line sensors as sensing component. At the same time, the light signal is transmited by using sensors and voltage comparator lm393 to detect the black line on the road; meanwhile this detection signal is transmited to microcontroller signal port, with analysising by Microprocessor control . The smart car can travel by black line. This project involves control technology, the sensor technology, computer and power electronics and other professional domain knowledge, make the car can imitate human thought complete scheduled tasks.
Traction Control for a Fuel Cell Hybrid Vehicle (FCHV)
Authors: Yang Woo Joo , Kim Young Bae
Published: July 2012

Traction control for the proton exchange membrane (PEM) fuel cell hybrid vehicle is studied. The traction control denotes the anti-slipping action when the vehicle meets sudden road surface friction changes. Slip ratio is utilized to analyze the slipping action, and optimum value is chosen for controlling the motor speed to prevent the slip. A one-dimensional longitudinal model of a fuel cell vehicle is constructed to prove the traction control effectiveness. The model includes a fuel cell system, a battery, an inverter and permanent synchronous motor, a bi-directional converter and a vehicle dynamics. Two three-phase permanent magnet synchronous motors (PMSM) are utilized to generate the required power for the vehicle traction. Maximum transmissible torque estimation (MTTE) control and sliding mode control are utilized for the PEM fuel cell vehicle traction control algorithms. The simulation results show that the proposed control algorithm effectively prevents vehicle slipping when a PEM fuel cell vehicle meets a sudden road friction change by distributing appropriate powers between battery and fuel cell.
Kinematic Analysis of an Anthropomorphic Robot Hand
Authors: Parida Pramod Kuma , Biswal Bibhuti Bhusan , Thatoi Dhirendra Nath
Published: July 2012

There has been a continuous effort by researchers to develop multi-fingered robot hands for variety of applications. Some of these hands are meant for industrial applications while thers are used for orthopedic rehabilitation of humans. However the degree of success to develop an anthropomorphic robot hand in close resemblence with a typical human hand has not been satisfactory. In the present work an attempt has been made to design a robot hand having five fingers with 25 degrees of freedom by closly following the anatomy of human hand.The kinematic analysis of the hand offers confirmative results for effective graspingand manipulating objects.
The Fuzzy Comprehensive Evaluation of Laser Weapon System Combat Effectiveness
Authors: Li Hui , Guo Li Hong
Published: July 2012

To evaluate the laser weapon system’s combat effectiveness, which is related with so many factors, is a very complex issue. In this paper, by analyzing the factors which influence the laser weapon system, an index system for the laser weapon system comprehensive evaluation of the combat effectiveness is built up. The method of calculating weight, the improved analytic hierarchy process is introduced. The evaluation model of improved fuzzy-AHP is established and the feasibility and the validity of the proposed evaluation method is validated through a practical example.
Numerical Simulation on Shock Initiation of Double-Shell Charges by High Velocity Impact
Authors: Liu Xue , Zhang Qing Ming
Published: July 2012

A two dimensional axisymmetric finite element analysis is preformed using AUTODYN-2D hydrocode, to simulate the dynamic response of explosive, named PBX9404 which is located behind double-shell, by the impact to shell surface resulted from high velocity spherical projectile. Simulation results shows that shock to detonation transition occurs when impact velocity is between 3.6~3.9km/s; but when the velocity increases to 4~4.3km/s, projectile will break up into pieces and the surface momentum density of debris cloud to second shell will decrease dramatically so no shock to detonation could occur. When the velocity further elevates to 4.4 km/s and above, projectile kinetic energy will cover the energy of projectile break-up, and also provide sufficient energy to further increase the surface momentum density of debris cloud, with a result that shock to detonation can be observed again. In conclusion, there is a velocity blind zone in shock to detonation of high velocity projectile to double-shell charges.
Research on a Nonlinear Fuzzy Comprehensive Assessment Method for Oil & Gas Pipeline Failure Based on Fault Tree Analysis
Authors: Wu Xue , Xiao Ci Yuan , Xu Xue Yan
Published: July 2012

The combination method of fault tree analysis and nonlinear fuzzy comprehensive assessment method was proposed to make research of oil & gas pipeline failure .The common factors influencing oil & gas pipeline failure could be determined with fault tree analysis .However , the practical operated oil & gas pipeline often have some individual factors and fuzzy ones .Nonlinear fuzzy comprehensive assessment method could evaluate objectively based on evaluated factors sets and weight sets provided by fault tree analysis .The new model steps were listed by taking the example of oil & gas pipeline failure .The result indicates that the method is more reasonable and easier for engineering application , and the evaluation result is more with the objective reality.
Damping Force Analysis of Magnetorheological (MR) Dampers
Authors: Xing Hai Jun
Published: July 2012

In this paper, utilizing Herschel-Bulkley model, the equation of MR fluid pressure gradient is derived in order to predict MR damper’s force-velocity behavior. The equation, showing as a complicated nonlinear algebraic expression including various parameters, is then simplified to a nondimensional equation. This is followed by the analysis of the root of this nondimensional equation and an approximate root closely corresponding to numerical result is given.
Numerical Investigation of a Blade Riblet Surface for Drag Reduction Applications with Large Eddy Simulation Method
Authors: Wu Nan Huo , Tang You Hong , Zhao Cheng Bi , Lin Wei , Chen Xiao Ming , Li Run Heng
Published: July 2012

Fully developed turbulent channel flow with a blade riblet surface has been simulated numerically at Reynolds number by Large Eddy Simulations (LES). The blade riblet is shown to provide a total viscous drag reduction approximately 9% with the riblet spacing and the cross section . For the sake of investigating the interaction of the turbulent flow with riblets, the mean velocity profiles, velocity fluctuations, and instantaneous flow visualization have been analyzed. It has been found that the riblet of certain size reduces drag by damping the dynamics and weakening the cross motions in the near-wall boundary layer, revealing beneficial turbulence controlling.
The Design and Manufacture of the Intelligent Electric Cars for Firefighting Based on SCM
Authors: Tang Min Li , He Ling , Wu Heng Yu , Wang Wei , Cai Li Sha
Published: July 2012

With the AT89S52-SCM as the control core, the system is made up of DC, steering gear, photoelectric sensor, flame sensor, power circuit and so on. The system makes the car move and turn through the I/O of AT89S52. The RPR220-optical on the tube helps tracing. Infrared flame sensor helps flame scanning. At the same time, the buzzer and the LED make the alarm function. The LCD monitor and three buttons help to make the real-time status display and start control. The system is flexible and easy to control, tracing fast, accurate and stable operation, and lower costs, while the software of the controlling system could be improved further to expand its functionality, but does not require additional hardware costs, thereby enhancing the smart car's cost performance.
Study on the Efficiency Optimization of U-Shaped Curve Rail Type AS/RS
Authors: Liu Hui , Huang Yang Bo , Xing Ying
Published: July 2012

We analyze the overall operation process and storage model of U-shaped curve rail type AS/RS, put forward an optimization designing method based on minimal operating time, set up a mathematical model, and make verifications using genetic algorithm which show that this optimization method greatly increases the operating efficiency of U-shaped curve rail type AS/RS, and provides a powerful reference for its application.
Study on Sheet Bonding and Break Strength Characteristics
Authors: Tao Jin Song , Yang Pi Sen
Published: July 2012

For researching the paper sheet bonding and break characteristics, hardwood pulp, bamboo pulp and softwood pulp were used to form sheet, and beating degree, basis weight and PAM were changed to research the influence on elastic modulus and the specific value of yield strength to break strength. The result shown that beating degree, basis weight and PAM have influence on elastic modulus and have minor influence on the specific value
Static and Dynamic Stiffness Characteristics Analysis of Hydro-Pneumatic Suspension
Authors: Wei Jian Hua , Du Heng , Lin Hai
Published: July 2012

A simplified nonlinear model in time domain and a linear model of hydro-pneumatic suspension in frequency domain were established and the expression of static stiffness and dynamic stiffness of hydro-pneumatic suspension were derived out. The expression of dynamic stiffness contains the static stiffness. Equivalent static stiffness rises with tire stiffness increasing, with the pressure of non-rod cavity of suspension cylinder increasing and with the initial position of suspension cylinder decreasing. Dynamic stiffness related to frequency increases dramatically as the frequency increases. The concept of the dynamic stiffness was proposed. The vibration characteristics of hydro-pneumatic suspension in the view of frequency domain can be analyzed and it is the reference to analyze the stiffness characteristics for suspension.
Analysis of the Dynamic Response of a Cracked Beam Structure
Authors: Thatoi D. N. , Nanda J. , Das H.C. , Parhi D.R.
Published: July 2012

In this research, dynamic behaviour of a cracked cantilever beam has been analysed using finite element and experimental analysis. Deviations in mode shapes and natural frequencies have been noticed due to the presence of crack in the beam. The variation in the dynamic response is due to change in local flexibility because of the presence of crack in the beam. Finite element and experimental analyses have been carried out to find out the vibration indices of the cracked cantilever beam for validating the robustness of the theoretical model used for crack detection. The numerical results obtained through FEA are in good agreement with experimental results.
Deformation and Stresses Analysis in FG Rotating Hollow Disk and Cylinder Subjected to Thermal and Mechanical Load
Authors: Khorshidvand A. R. , Javadi M.
Published: July 2012

In this paper, a new solution is presented for one-dimensional steady-state mechanical and thermal stresses in a FG rotating hollow disk and cylinder. The material properties for FG are expressed as nonlinear exponential functions through the radius and Poisson’s ratio is taken to be constant. The temperature distribution is derived from first law of thermodynamics by solving energy equation, with a general thermal and mechanical boundary conditions on the inside and outside surfaces. Heat conduction and Navier equations are solved analytically by choosing elliptic cylinder coordinates system and the results are shown for displacement and stress components along the radial direction.
Test and Numerical Analysis of Underwater Explosion on Circular Plates
Authors: Koohsar A.A. Sheikhi , Nasereddini S.M.S. , Bazrafshan E.
Published: July 2012

Underwater explosion is a complex discussion because it has two phase environment including shock waves, bubble effects, cavitation, high strain rate, geometric and material non linearity. Results of underwater explosion tests on the circular steel plates have been discussd. Test results compared with numerical analysis results which it is done by LS-DYNA code. LS-DYNA is the software which is used to analyze large dynamic deflections by use of explicit method. We found that this code has good accuracy to predict the maximum deflections. Strain rate effects included in the program by use of Cowper-Symonds relation.
Comparing of the Welding Atmosphere Moisture Effect on Hydrogen Distribution in TI-6AL-4V, Pure Commercial Titanium and TI-15V-3CR-3SN-3AL Weld Joints
Authors: Nasereddini S.M.S. , Koohsar A.A. Sheikhi , Bazrafshan E.
Published: July 2012

Welding-titanium and titanium alloys must be performed with special precautions because these materials are very reactive to contamination from atmosphere gases. One of the important technological considerations in welding titanium and its alloys is protection of the molten weld pool and HAZ from atmospheric gases such as nitrogen, oxygen, carbon dioxide and moisture and contamination. Absorption of the atmospheric gases affects the mechanical and metallurgical properties and may cause embrittlement, lake of fatigue strength and hydrogen cracking of titanium welds. In this paper, the effect of welding atmosphere moisture on hydrogen absorption and distribution in Ti-6Al-4V, pure titanium and TI-15V-3CR-3SN-3AL TIG welds has been studied. The experimental results indicated that hydrogen distribution which was symmetrical with respect to the weld axis had maximum and minimum points. It was also observed that heat treating the joints after welding resulted in reduction of the magnitude of the maximum and minimum points as well as redistributed the hydrogen in the welds in such a way that the distance of the maximum and minimum points got farther from the weld axis. This distribution is affected by type of titanium alloy and degree of annealing .in this investigation we used vacuum welding chamber with TIG welding apparatus and a special metal sampling and composition detecting systems for joining the samples and detecting the amount of hydrogen in the weld metal .the aim of this investigation was to increase the level of our knowledge about harmful effect of diffusion the hydrogen in the different titanium alloys. Introduction
Design and Research of Electric Vehicle Driving System Based on SOPC
Authors: Zhao Ya , Qi Hui
Published: July 2012

Motor driving system is a key technology for electric vehicle (EV), and brake energy feedback technology which benefits to prolong driving rang is typical feature of electric vehicle driving system. Hardware logic realization of permanent magnet synchronous motor (PMSM) driving control algorithm for EV in some sense contributes to the integration of EV controller. This paper mainly researches on vector control and energy feedback algorithm for PMSM, constructs digital high performance algorithm test platform for low power PMSM, and completes driving control of PMSM based on this platform
Study on the Temperature Filed of Wet Dual Clutch Transmission during Starting Process
Authors: Liu Xi , Cheng Xiu Sheng , Li Yan , Gu Qiang , Wang Yin Shu
Published: July 2012

Based on the analysis of starting process of wet dual clutch transmission, dynamic rules for piston pressure and relative angular velocity of wet clutch were determined, According to the unsteady heat exchanging theory and the heat exchanging process of clutch engagement, a two dimensional heat conduction model of wet clutch was developed with reasonable initial conditions and boundary conditions. Matlab/PDE toolbox was used to solve the established model. The temperature distribution of friction pairs along the axial and radial direction were revealed in the Simulation results. Testing program had been designed, and real vehicle test was done to the temperature field on friction interface of wet dual clutch transmission in starting process. The test result indicated that the temperature field model and its solution were reliability, and it was instructive to optimize the design of wet clutch and its engaging control in starting process.
Progress in Numerical Studies of KE Projectile into Concrete with Mass Loss
Authors: Guo Lei , He Yong , Zhang Xian Feng , Zhang Nian Song , Pang Chun Xu
Published: July 2012

A review on the numerical studies about KE(kinetic energy) penetrator into concrete target with mass loss is presented. There are two main ways to study the mass loss in numerical simulation: finite-element method and abrasion iterative algorithm. For each method, detailed introduction is given at home and abroad. A summary of their research, including their advantages and disadvantages, is described. Finally, some research proposals are given for further study.
Study on the Mechanisms of Hydraulic Fracturing Crack Initiation and Propagating
Authors: Li G. , Li Lian Chong , Tang Chun An
Published: July 2012

The hydraulic fracturing technology is widely used in the forefront of engineering and production, the mechanisms of hydraulic fracturing crack initiation and propagating are the core content of hydraulic fracturing research. We explain the tensile mechanism of rock under the hydraulic effect, give the two forms of the crack initial water pressure (total stress and effective stress expression) in detail. From the results of theoretical analysis, experiment and numerical simulation we discriminate the mechanisms of hydraulic fracturing crack propagating, which show that cracks are distributed in the minimum principal stress plane under different stress situations. Furthermore, the injection rate is an important influencing factor. The study is valuable to the engineering design of hydraulic fracturing.
The Fined COD Transform Formula for CT Specimens to Investigate Material Fracture Toughness
Authors: Yao Yao , Cai Li Xun , Bao Chen , Jiang Han
Published: July 2012

For front-force compact tension specimen (FFCT), based on the refined results of the relationship between crack tip opening displacement and load line crack opening displacement from Finite Element Analysis (FEA), the influences of material properties and plastic deformation near the crack tip have been analyzed. A simplified and accurate transform formula for FFCT specimens is presented in this paper, and the error analysis is conducted.
The Effect to Structure due to SSI
Authors: Shang Shou Ping , Chen Wan Ruo , Liu Xi La
Published: July 2012

In order to understand the soil-structure interaction, we were doing the excitation test about 1:4 scaled steel frame-raft foundation model in the soil bin. The test was through changing the stiffness of the superstructure respectively. We inputting Gaussian white noise measured vibration period, dynamic response with EL and Taft wave show the shock absorption effect of the soil. Finite element software sap2000 simulated rigid foundation on the dynamic response analysis on the steel frames. We found that there are some differences about the natural period, the upper structural stiffness greater the additional period is longer. Soil has a shock absorbing effect with the steel frame, the effect mainly come from the change of structure stiffness. Because of the soil-structure interaction, peak acceleration of the top storey is reducer when steel framework excitation on the soil bin than on rigid foundation, and peak displacement of the top storey is increased.
A Residential Building Crack Test and Construction Safety Assessment
Authors: Luo Ju Gang , Zhang Jin Yang , Zhang Qing Song
Published: July 2012

A residential building, a brick/concrete structure built up in 1990s was used for many years. Since a deep foundation pit construction was being done in the north, the residents were worrying about the cracks in the building and its safety. Therefore, the following works were done such as the spot checks of the building engineering quality were done; the test and analysis were carried out over the cracks development after the foundation pit was backfilled, the influence assessment of the foundation construction under the mutual effects of pilings and anchor rods over the residential building structure was also conducted; finally the recheck calculation and safety evaluation were made over the building structure. The result shows that the foundation digging leads to new cracks on the nearby residential building but does not endanger its structural safety; after the foundation was backfilled, the hidden danger on the building’s northern side slop was eliminated and the structure cracks tend to be stable; the complete engineering structure is safe and in conformity with the requirements of safety and anti-vibration during the construction period, however, the multiple-pore slabs’ piecing affects the structural integrity and vibration proof performance.
Development of ZJ200 Portable Steel Bridge
Authors: Xu Guan Yao , Ouyang Chu , Zhu Jie
Published: July 2012

ZJ200 Portable Steel Bridge has its roots in the Bailey design, but the application of high-grade steels and advanced computer design and finite element analysis (FEA) techniques led to more effective structures. The design of the Bridge is modular, allowing full spans up to 60 meters in 3.048 m increments. Highways Loads up to HS25-44 have been proven during extensive testing.
Vibration Test and Stochastic Analysis of Large-Span Cantilevered Floor
Authors: Zuo Qing Lin , Wang Li Chang , Ji Da Hai
Published: July 2012

With the study of the 3rd conference hall of Dalian International Conference Center, test and relevant calculation are applied to the structural natural frequency and floor vibration due to human excitations. The Monte Carlo stochastic analysis is applied to the cases in which the comfort for vibration due to crowd excitations may exceed the limit. The results show that the Monte Carlo stochastic method and load curves of excitations are reliable, but in the actual test the high-order harmonic effect of walking excitation is not obvious. In the stochastic analysis with the closer frequency and phase of crowd excitations or the greater population density, the discreteness of results is smaller. Compared with the population density, the differences of frequency and phase of crowd excitations lead to a bigger discreteness of results. With the bigger discreteness of frequency and phase of excitations, the peak accelerations of stochastic model are significantly smaller than the simplified model with the same frequency and phase.
Study on Thermal Stresses of Over-Long Concrete Slab
Authors: Huang Jiang , Lou Dong Hao , Fang Hong Qiang , Cheng Yuan
Published: July 2012

Based on available theories and practical experience, this paper present an analytical method used for analyzing thermal stresses of over-long concrete slab through design for a real typical structure. Construction sequence, temperature conditions and material properties were considered. It stated that overlong non-joint structures exceeding code limits could be adopted according to the result from the structural analysis.
The New Analytical Theory of Restrained Torsion of Thick-Walled Concrete Box Girder Bridge
Authors: Xu Xun , Qiang Shi Zhong
Published: July 2012

Directed toward the feature of restrained torsion of concrete box girder bridge, the layered approach of analyzing restrained torsion is put forward, displacement model and geometric equation are established by using the generalized coordinates principle, and the formula of restrained torsion shear stress is derived, and then a analytical theory of restrained torsion of thick-walled box girder is established based on the mixed variational principle. The numerical experiment indicate that it cannot be neglected that thick-walled effect of restrained torsion of concrete box girder bridge and the predicted results by the new theory are accurate.
Study of the Bending Stiffness and Cable Characteristics of Tension Components
Authors: Tang Mao Lin , Du Ya Guang , Shen Rui Li , Yan Kun
Published: July 2012

To study the behavior changing between cable characteristics and beam characteristics, the geometric shape calculation formulae for tension components with bending stiffness are derived from ones with the boundary conditions of two ends hinged, one hinged joint and the other fixed and two ends fixed respectively. Then, using the concept of tension stiffness, the effects of Cable Characteristic Parameter on the geometric shape of tension components are studied. Analyses indicate that with the increase in the value of the Cable Characteristic Parameter, the cable characteristics of components become more obvious. That is, a bar with enormous tension can be calculated as a cable element even if its bending stiffness is large. In structure finite element analysis, more storage space and computing time could be saved as long as components are simplified with cable elements other than beam elements, the simplification should be carried out basing on the Cable Characteristic Parameter. Calculation results on a hollow beam verify that when tension increases, components’ mechanical properties gradually change from beam characteristics to cable characteristics and eventually they tend to be identical with the theoretical calculation of cable structure.
Calculation of Corrosion Losses on Weathering Steel Structures
Authors: Křivý Vit , Fabián Lukáš
Published: July 2012

The aim of this paper is an introduction of the new developed method for calculation of corrosion losses on structures designed from weathering steels. Apposite calculation of corrosion losses is an essential requirement for resulting determination of corrosion allowances that must be considered when designing steel structures from weathering steels.
Experimental Study of Mix Proportion of Magnesium Oxychloride Cement
Authors: Qiu Zhan Hong , Feng Jin Rong , Xiao Lei , Zeng Zhi Yong
Published: July 2012

Based on the results of compression and bending tests of fifty eight magnesium oxychloride cement test cubes, the influences of two factors on compression and bending strength have been analyzed which includes the mole ratio of magnesium oxide and magnesium chloride and Baum degree of magnesium chloride solution. Softening coefficient of magnesium oxychloride cement and its influence factor have been studied by immersion test of twelve test cubes. The results show when the mole ratio of magnesium oxide and magnesium chloride is 7.0, the strength and water resistance performance of magnesium oxychloride cement is best. This work is very important to the application and dissemination of magnesium oxychloride cement bearing structural member in southern wetter areas of china.
Preparation of Calcined Phosphogypsum-Based High-Strength Supersulphated Cement
Authors: Gao Yu Xin , Yu Bao Ying , Xu Fen Lian , Lin Xi Hua , Yang Shi Hai
Published: July 2012

Based on mechanical properties, the influences of the clinker dosage(C1, C2, C3), calcination temperature(M1, M2, M3) of phosphogypsum(PG) and specific surface area(S1, S2, S3, S4) on the mechanical properties of supersulphated cement(SSC) were systematically studied; Then SSC with different kinds of PG were chose to research water requirement of normal consistency, setting time and soundness; Strengthening mechanism on SSC were further investigated and analyzed with scanning electron microscope(SEM) and chemical composition analyzer at last. Results showed SSC with conditions of C2, T3 and S3 has 36.4, 56.5 and 72.6MPa standard mortar compressive strength at 7d, 28d and 56d curing age. Calcined Phosphogypsum(CPG)-based high strength SSC is successfully developed.
Asphalt Pavement Performance Evaluation Based on SOM Neural Network
Authors: Hu Man Jiang , Ge Ru Hai , Qiu Qi Feng , Jin Qiao
Published: July 2012

In order to make the performance evaluation of asphalt pavement more scientific and reasonable, the author put forward an evaluation method based on SOM neural Network. This method takes comprehensive consideration of four affecting factors including pavement ride quality, pavement condition, pavement structure bearing capacity and pavement skid resistance. Then designs and simulates the SOMNN programming to comprehensive evaluate the pavement performance. Finally, the method was verified by an example, and the calculation has been compared with the traditional evaluation methods. Results showed that the method was reasonable and effective. Compared with others, this method was simpler, cheaper and easier to promote and has better superiority.
Analysis on Seismic Response of Portal Segment of Highway Tunnel in High-Intensity Earthquake Areas
Authors: Ou Er Feng , Yan Song Hong , Liang Qing Guo
Published: July 2012

The use of underground structures such as tunnel for subways, highways, material storage, and sewage and water transport is increasing in the West of China. As the strongest earthquake recent years，the Wenchuan Earthquake (M8.0) on May 12nd, 2008，has caused very severe casualties and property losses. Relying on the left line tunnel portal segment of the Xiaoshicun Tunnel, the dynamic response analysis were conducted by FEM. The response patterns of stressand displacement of the tunnel structure were respectively studied both under the single horizontal earthquake action and the interaction of horizontal and vertical earthquake actions. The results indicated that the difference of seismic response in diffrent parts of tunnel linging was obvious, the response under both horizontal and vertical earthquake action was bigger than that under single horizontal motion.
The Application of BIM in Intelligent Construction
Authors: Wang Li Jia , Huang Xu , Zheng Rong Yue
Published: July 2012

“Intelligent Construction” is an innovative idea adapted to a new era of development for the construction industry. In promoting the development of “Intelligent Construction” concept, it can make various stages of the design; the construction and implementation of a project more effective in conserving resources, saving costs, reducing pollution and improving the efficiency of the desired target. BIM is an integrated expression of the construction projects information and model. The effective use of BIM technology can improve the efficiency of the projects construction, while saving cost thus making “Intelligent Construction” necessary. This paper is to propose a strategy for BIM Intelligent Construction, based on a through analysis of the concept of Intelligent Construction and the relationship described between BIM and Intelligent.
Reliance of Embedment Strength on Dowel Diameter in Joints of Cement-Splinter Boards
Authors: Vavrusova Kristyna , Lokaj Antonín , Žídek Libor
Published: July 2012

The aim of this paper is determination of embedment strength of cement-splinter boards in dowel dual-shear joints on the base of destructive laboratory measurements of these joints with selected diameters. Reliance of embedment strength on dowel diameter is determined.
Calculation for Elastic Global Buckling of Sandwich Plates with Ribs
Authors: Xue Qi Chao , Zou Guang Ping , Wu Ye , Xiong Hai Lin , Chai Meng
Published: July 2012

Based on Reissner’s sandwich plate theory, the critical globlal buckling equation of sandwich plate with ribs is deduced by energy method under simple support boundary conditions. And the critical buckling solution is obtained and discussed here. Afterwards a rectangular sandwich plate with steel faceplate and polyurthane core is taken as an example. The influence on critical global buckling stress with different inertia moments in rectangular sandwich plates are discussed. simularly the effect of the lengh ratio of two sides and the thickness of rectangular sandwich plate are also studied.
Study on the Drafting and Early-Warning of Temperature Double-Control Index of Different Sections & Periods of Concrete Block
Authors: Shen Dong Sheng , Huang Yao Ying , Zhou Yi Hong , Liu Dan Dan , Gao Xiang Ze
Published: July 2012

Although real-time tracking and feedback were carried out for the dam concrete construction process, there was still certain blindness in the construction units. The temperature double-control index, which is the allowable temperature and temperature gradient under typical age before concrete block reaching its maximum temperature, was proposed in this paper on the basis of the analysis of measured temperature process curves of concrete blocks. The probabilistic method was applied to draft the temperature double-control index of different sections and periods based on the measured temperature process curve of the poured block of a constructing extra-high arch dam in southwest China. Furthermore, the prediction model was also provided and applied in the dynamic feedback of new pouring block. It is demonstrated by the practice that the prediction model proposed in this paper has better pertinence and maneuverability for the construction units to control the maximum temperature of concrete block, i.e. the maximum temperature in high temperature season and in low temperature season are both controllable.
The Analysis and Discussion of Sediment Transport Capacity Formula
Authors: Zhang Wei Yi , Lu Gui Ying , Pan Xi Shan
Published: July 2012

Combined with the equilibrium condition, the formula of vertical average sediment concentration has been derived from the vertical two-dimensional suspended sediment diffusion equation. Based on analyzing and comparing two hydrodynamic formulas, a new formula of sediment carrying capacity has been deduced. Some river and inshore sediment data has been collected to validate the formula and find that the new formula has higher accuracy and applicability comparing with the two hydrodynamic formulas, it shows that the new formula has a high application value.
Research on the Inversion of Equivalent Surface Heat Transfer Coefficient of Mass Concrete by Calculating its Heat Flux
Authors: Qu Li Xin , Zhou Yi Hong , Huang Yao Ying , Tang Guo Qing , Zhou Shao Wu
Published: July 2012

Most of the cracks on concrete dam are external ones, while external heat preservation is an important measure to prevent cracking. In order to obtain the actual thermal parameters, according to thermal conduction theory and the temperature distribution conditions of optical fiber on concrete surface, the surface temperature distribution of concrete pouring deck was real-time monitored by setting optical fiber in different depths; then the surface heat flux of mass concrete was calculated, thereby the equivalent surface heat transfer coefficient, which varied as time goes, was inversed. It is indicated that the inversion process is relatively simple and reliable, and the heat transfer coefficient obtained can well reflect the real performance of the insulation materials. Meanwhile, it is also indicated that the heat transfer coefficient of equivalent surface varies as time goes, which can contribute to back analysis calculation and actual engineering practice.
Finite Element Stress Analysis with Consideration of Equivalent Stress in ANSYS – Case Study of Namchien Dam under Static and Dynamic Conditions
Authors: Vu Hoang Hung , Li Tong Chun , Nguyen Quang Hung
Published: July 2012

A research on numerical modeling of arch dam with contraction joints under static and seismic conditions is performed in this study. Discussions on the use of the adaptive finite element method with consideration of the “equivalent stress” and simulating technique for the contact between dam segments are presented. A case study of stress analysis for the Namchien hydropower arch dam in Vietnam is given. The results showed that the numerical model established in this paper is effective to simulate complex physical models. The stability analysis is easily performed by using the self-adapting technique with consideration of equivalent stress, and the contraction joints between dam segments can be successfully simulated by assigning zero-thickness contact elements to control complex contact behaviors, such as slip, opening or closing of the contact surfaces. The results of this study will be a useful reference for the assessment of the dam safety in the future.
Numerical Simulation of the Effect of Section Size on Averaging Pitot Tube
Authors: Zhu Ying , Wang Yang , Wang Xiao Hua
Published: July 2012

Averaging pitot tube has been applied in practice more often in these years. This paper set up the two-dimensional model of the bullet-shaped averaging pitot tube, numerical simulation based on CFD was used to investigate the changes of flow coefficient along with the Reynolds number. The geometric size of the section was changed to investigate how it influences the flow coefficient and differential pressure. To guarantee the accuracy of the simulation, the grid and the simulation model were investigated too.
Defect Imaging Using Time Reversal Guided Waves in Pipes
Authors: Deng Fei
Published: July 2012

In order to realize defect imaging for guided waves inspection in a pipe, a time reversal method based on baseline subtraction method was introduced. In this method, baseline signals were prepared by detection on undamaged pipe. After that residual signals were obtained by executing subtraction between inspection signals and baseline signals. At last, without using the rectangular window for signal interception, time reversals signals are produced by time reversing the whole residual signals. Experiment and numerical simulation results show that this method simplifies the existing time reversal defect imaging method for guided wave inspection in pipes. Especially, a relatively whole defect’s passive wave field captured by this method will help us to achieve better imaging effect.
Hardware-in-the-Loop Test and Failure Mode Simulation for AMT
Authors: Zhong Zai Min , Chen Xue Ping , Kong Guo Ling , Chen Xin Bo
Published: July 2012

Control strategy and stability of actuator are highly important for the performance of Automated Mechanical Transmission (AMT). Targeting an electric AMT actuator, this paper sets up a Hardware-in-the-loop (HIL) test rig which is composed of TCU, AMT actuator, dSPACE Simulator, real-time simulation computer and AMT actuator loading simulation electric servo-system. In order to verify actuator and control strategy, the paper carries out several tests in typical driving conditions. it also analyses the shift performance and gives advices on further improvement. This paper lists several failure modes and extreme conditions of AMT. Some of them will be modeled in Simulink, in order to optimize AMT actuator and control strategy while ensuring enough driving ability when AMT is failed or vehicle is driven in extreme conditions.
The Relationship between the Traffic Accidents and Meteorological Condition on Beijing-Tianjin-Tanggu Expressway
Authors: Ding De Ping , Yin Zhi Cong , Li Xun , Xie Zhuang
Published: July 2012

Abstract. Based on the monthly datasets, including the number of traffic accidents, casualties and meteorological data, the relationship between the traffic accidents and meteorological conditions is studied. The results are as follows: (1) There are two peaks of the number of traffic accidents, which are the saddle-shaped peak from Apr to Jun and the second peak in Oct respectively. The number of traffic accidents in February is the least. The temporal distribution of the casualty is different from that of traffic accident. Most casualties happened in Jul. and the second in Apr. and Oct. The susceptibility of traffic accident and casualty in Hebei, Beijing and Tianjin decreased successionally from high to low. (2) A new result is obtained: in comparison with the number of traffic accidents, the correlation between meteorological condition and casualty is higher. The main reason is that the adverse weather conditions always cause drivers fail to control the vehicle or to make right decision. Therefore, the accident causing casualty should be focused on while the monthly weather-related accident is discussed. (3) The correlation coefficient between the number of casualty and precipitation or relative humidity is significantly positive. Otherwise, the correlation coefficient between the number of casualty and visibility or pressure is significantly negative.
Analysis and Application of Prediction Model for Public Parking Facilities Scale
Authors: Wang Li Juan , Li Shi Feng , Huang Lin
Published: July 2012

Prediction on the public parking facilities scale is an important work of the urban static traffic planning. It is extremely necessary and meaningful to analyze its total demand, supply scale, and constituent. On the basis of analysis for the characteristics of static traffic prediction method based on travel, a process of parking facilities scale forecasting with the core of trip attraction model was presented, and a prediction model for public parking facilities was also established by means of improving traditional trip attraction model according to a static traffic management influence coefficient. At last, combined with example of urban prediction, the application methods of the model and the principles of its parameter calibration are discussed. The result demonstrates that our prediction model provides a solution to forecast public parking facilities scale.
The Finite Element Model Research of the Pre-Twisted Beam
Authors: Chen Chang Hong , Huang Ying , Shan Jian
Published: July 2012

Based on the traditional mechanical model of straight beam element, the paper makes a systematic analysis and research on the pre-twisted beam finite element numerical model. Firstly, the paper proposed the pre-twisted Euler beam element mode, the mode uses 2 node and 12 freedom degrees, the element axial and torsion displacements use 2 nodes Lagrange interpolation function, bending displacement still use the cubic displacement. Secondly, the paper studies a new pre-twisted Timoshenko beam element mode, the proposed new Timoshenko beam element takes separate interpolation polynomial functions both flexure bending and rotation displacement. According to the relationship between bending moment and shear, the relationship between of bending displacement and angle displacement is derived, which is more accurate to consider the effects of shear deformation. Finally, by calculating the pre-twisted rectangle cantilever beam example, and contrasting three-dimensional solid finite element using ANSYS, the comparative analysis results show that pre-twisted Timoshenko beam element mode has good accuracy.
Arsenite Oxidation Characteristics and Molecular Identification of Arsenic-Oxidizing Bacteria Isolated from Soil
Authors: Song Wei Feng , Deng Qi , Bin Li Ying , Wang Wei , Wu Chun
Published: July 2012

Arsenite oxidation characteristics were studied through domesticated bacteria from soil added arsenic artificially, which came from Dinghu Mountain Natural Reserve of Zhaoqing, Guangdong, China. Two individual bacterial strains were selected as arsenite-oxidizing bacteria by reaction of silver nitrate and detected in community DNA fingerprints generated by PCR coupled with denaturing gradient gel electrophoresis. Physiological, biochemical and arsenite oxidation characteristics of arsenic-oxidizing bacteria were researched. They were gram-negative and rod-shaped bacteria, which were 99% related to Alcaligenes sp.(strain H) and 100% related to Agrobacterium sp. (strain Q) respectively. The arsenic-oxidizing experiment showed that the optimal temperature and pH were 30°Cand 9.0 respectively for both strains. Strain H was an efficient arsenite-oxidizing bacteria. It oxidized As(III) by nearly 100% after 21 hours. Therefore, It was detected as the most perspective strains in this study.