bluuebunny/crossref_metadata_2025 huggingface dataset:
The Freeze-Thaw Resistance of Concrete Control Structure for Debris Flow on Tianshan Highway
Authors: Huang Yong , Xu Hui Ning , Chen Hong Kai
Published: July 2012

The extreme climate in Tianshan area has a significant impact on the freeze-thaw resistance of concrete control structure for debris flow. This paper describes a fiber reinforced concrete designed for Tianshan area. The impact factors on the freeze-thaw resistance of concrete are analyzed. The optimal composition for concrete control structure is discussed. And the engineering economic of such material is compared with that of Portland cement concrete. Research results shows fiber reinforced concrete can greatly improve the freeze-thaw resistance of concrete, and significantly extend its life with a great of practical value.
The Analysis, Discussion and Suggestions for the Mesh Reinforcement Technique of Polymer Mortar Wire Rope
Authors: Zhang Shu Ren , Li Zhong Long
Published: July 2012

The mesh reinforcement technique of polymer mortar wire rope is a new reinforcement technique used more in the domestic fittest reinforcement project recent years. Recently, there is no unified technical standards, the detailed practice is not same in practical work. There are big differences among the reinforcement effects. The key issue of wire rope is whether add prestressed or not. If add, how much should be prestressed? The difference of the actual practice and reinforcement effect reflects the understanding gap polymer mortar wire rope of mesh reinforcement technique action principle of the designer. A correct understanding of polymer mortar wire rope of mesh reinforcement technique the mechanism and the objective analysis strengthening effect and actively explore research in engineering application problems have a practical significance to promote the healthy development of the structure strengthening technology.
Load Transfer Characteristics and Durability Study of GFRP Dowels in Jointed Concrete Pavement
Authors: Li Luo Ke , Tan Yi Qiu , Gong Xiang Bing , Li Yun Liang
Published: July 2012

The corrosion of steel dowels in concrete pavement can compromise the load transfer capability of joints and lead to premature damage. To solve this problem, the non-corrosive glass fibre reinforced polymers (GFRP) bar has been used as dowels in concrete pavement instead of the steel dowels.This thesis demonstrates the Load Transfer Characteristics of a GFRP dowels with the help of a 3D finite-element model, and various evaluation method and index are studied as well, including: (1)efficiency of load transfer , (2)coefficient of shear transfer , (3) distribution ratio of shear transfer. An accelerated test is applied to examine the long-term performance of the GFRP dowel bars by using self-designed equipment.This study shows that GFRP dowels is a feasible alternative to steel dowels which can entirely meet the needs of road performance, and the research results will be useful in the design and application of GFRP dowels in jointed concrete pavements.
Rutting Resistance Evaluation of Structural Combinations of Asphalt Pavement Subjected to Heavy Duty
Authors: Dong Ze Jiao , Gong Xiang Bing , Xiao Gui Qing , Long Teng
Published: July 2012

Rut，referred to as a common damage of asphalt pavement ，is still a knotty problem to pavement researchers. Many reasons could cause rut, among which heavy duty, improper pavement structural combination design are two principal factors. As a result, three pavement structures and seven types of asphalt mixtures were used to evaluate the rutting resistance performance of different structural combinations. At first, through Marshall design method, the properties of asphalt mixtures were obtained such as gradation, asphalt content and so on. Based on the comparison of gradations and anti-rutting additives, the single layer rut was tested by wheel tracking test. Then, in order to consider influence of pavement structural design on pavement rut, six types of structure combinations under identical heavy duty condition were designed to perform rutting test. It shows that anti-rutting gradation and anti-rutting additives can improve rutting resistance performance of single layer. Also, a proper structural design could provide a better bearing capacity of wheel load even for heavy duty. It is better to integrate the anti-rutting gradation and anti-rutting additives into structural design. In this paper the results provide some new insight into the relationship between rutting resistance and mixture gradation, anti-rutting additives, heavy duty and structural combination. The consideration of these factors will give a better pavement design.
A Dynamic Emergency Evacuation Network Optimization Problem with Crossing Elimination Strategy
Authors: Wang Ze , Ma Shi Yong , An Shi
Published: July 2012

This paper presents a dynamic evacuation network optimization problem that incorporates crossing elimination strategy. Bottleneck problem at intersections during evacuation process is analyzed for the effective evacuation planning. The developed model is formulated as a system-optimum traffic assignment based on cell transmission model (CTM), which can effectively investigate the characteristics of randomness and dynamics of evacuation flow’s spatial and temporal distribution. The numerical results show that the model can provide crucial theoretical support for evacuation decision-making for traffic managers.
Research on Alignment Consistency of Highways with the Basis of 85MSR
Authors: Zhang Xing Lei , Meng Xiang Hai
Published: July 2012

The alignment consistency of highways is an important guarantee for vehicle safety. In this thesis, by comparing the computing methods of ΔV85 and 85MSR, the author concludes that 85MSR is a more appropriate way to evaluate the highway alignment consistency. The author studies Ningfu section on Heda superhighway with 85MSR, pointing out the section with poor alignment consistency, and provides basic data for the analysis and prevention of this section and road improvement.
High Strength Concrete Small Hollow Blocks Made with Rock Chips as Aggregates
Authors: Zhang Yong Quan , Yuan Jie , Ge Yong
Published: July 2012

It is more and more general of using industrial solid waste as the aggregates in construction materials for non-structural applications. But because of the developments and applications of reinforced blocks masonry structure in the modern masonry structure, especially in the mid-high and high storey buildings, there will be a growing interest of using industrial solid waste to produce high strength concrete small hollow blocks for structural applications. This experiment by mixing the different proportions of rock chips within the range of 30-70% as the replacement for sand prepared high strength concrete small hollow blocks which the compressive grade is MU 15.0, the influence of aggregates grading on the compressive strength of high strength concrete small hollow blocks was investigated at the same water/cement (w/c) ratio (0.45). In addition, the influence of the different curing methods on the compressive strength and shrinkage of high strength concrete small hollow blocks were also investigated, test results showed that high strength concrete small hollow blocks under the curing method which is the one-time pouring the ample amount of water, covered and sealed with plastic sheeting, the compressive strength had a better development, and the total shrinkage was larger than others.
A Dynamic Loading Test for Evaluating Permanent Deformation Resistance of Asphalt Mixtures
Authors: Xie Xiao Guang , Wang Long , Zhang Xiao Rui
Published: July 2012

Recent research shows that there is a serious need for accurate methods to evaluate the deformation resistance of asphalt mixtures at high temperatures, especially for stone-skeleton mixtures. To reflect the interlocking angle between coarse aggregates, confining pressure should be considered during testing. The dynamic loading test has been developed for applying different repetitive loads to a limited area of the specimen. This test can measure permanent deformation indices under different loads to evaluate the deformation resistance of asphalt mixtures at high temperatures. The dynamic loading test is conducted on samples with different compaction rates and gradations. Further, the rutting resistance of two types of gradation is compared with a wheel tracking test and a dynamic loading test. The test results indicate that the dynamic loading test can apparently distinguish the influence of gradations on rutting resistance. It is also derived from this test that dense-graded mixtures have higher permanent deformation susceptibility than coarse-graded mixtures, which is consistent with experience in the field and validated by experiments. This test can reflect the entire permanent deformation and separate the compactive deformation and shear flow deformation. Furthermore, this test can simulate heavy and repeated loads to fully exhibit the deformation resistance of asphalt mixtures, especially for coarse-graded mixtures. However, this test is limited by the effects of rigid confinement, which can be improved by changing the confining pressure.
A Game Theory Approach for the Operators’ Behavior Analysis in the Urban Passenger Transportation Market
Authors: Hu Xiao Wei , Wang Jian , Sun Guang Lin
Published: July 2012

Urban passenger transportation market in China now is composed by three public transportation modes, including the conventional bus, taxi and the subway (or light rail). There are both cooperation and competitive behavior existing among these three different transportation modes. This paper aims to describe how these three operators make their operational decisions in the competitive environment. A bi-level programming operational model is proposed to model urban passenger transportation operators’ decision behavior, which is based on the game theory to describe the behavioral conjectures among the management authority, different operators and passengers. The upper-level model described the management authority’ regulation on the fares of each mode, which aimed to achieve the comprehensive social objectives, indexed by the travel time cost, air pollution cost and energy consumption cost. The lower-level model described the three operators’ aiming to maximize the profit by determining the service frequency, which can reflect the operators’ cooperation and completive behavior under urban passenger transportation economic policy. A Logit model is proposed to analyze passengers’ mode choice behavior with the maximization of their travel utilities, which considers the total travel time, waiting time and total travel fare of each mode. This research will provide more evidence for urban passenger transportation development and contribute to urban passenger transportation economic policy establishment and implementation.
Effects of Construction Conditions on Built-In Temperature Gradient of Concrete Pavement: A Numerical Study
Authors: Quan Lei , Tian Bo , Feng De Cheng , Li Xin Kai
Published: July 2012

The built-in temperature gradient of concrete pavement formed during hardening period caused by various construction conditions will permanently exist in the pavement, which will have significant influence on the service behavior of concrete pavement. However, it’s still not involved in the current Specifications of Cement Concrete Pavement Design for Highway in China. In this paper, a user subroutine based on the ABAQUS code was developed to simulate the effects of weather condition, paving time, curing method, raw material temperature on built-in temperature gradient. The analyses indicate that these factors always produce obvious positive gradient in the slab and the influences of the first three aspects are obvious and the paving temperature of mixture has limited effect on the increasing of the final set temperature gradient. Furthermore, built-in temperature gradient is proposed as an index to evaluate the influences of various construction factors and optimize construction measures.
Price Transmission Mechanism of Transit Service in City
Authors: Sun Guang Lin , Wang Jian
Published: July 2012

Price transmission of transit service is a distinct mechanism with common characters. This paper aims to provide the nature and law of price transmission of transit service. The transmission of transit service prices is defined and transmission routes are classified into vertical and horizontal. The cost-push and demand-push are to drive the price carriers along transmission routes, which produces the price transmission network. Augmented Dickey-Fuller (ADF) and Granger co-integration test are used to measure the cost-push price transmission. For demand-push price transmission, the demand elasticity was used to model the relationship between transit demand and prices.
Transit OD Generation Based on Information Technology
Authors: Chi Li Bing , Wang Jian
Published: July 2012

Due to development in computer and information technology, data access and collection have becoming more and more convenient. In many cities’ transit system, transit vehicle GPS data and passenger IC card data could be provided. This paper focuses on the method that uses the passenger IC card data (only record once per trip) and transit vehicle GPS data to generate the transit OD matrix. After analyzing the characteristic of transit trips, the author gives the definition of continuity for a transit trip. Based on this definition, this paper then presents a search method to generate the transit OD matrix. The validity of this method has been tested in the modeling process for Zhengzhou city’s comprehensive transportation system. At the end, it is hoped that this research may give a useful lesson for other cities’ transportation modeling practice.
Driving Mode at Pothole-Subsidence Pavement Based on Wheel Path & Speed
Authors: Pei Yu Long , Mao Cheng Yuan , Song Mo
Published: July 2012

The pavement distress has considerable influence with drivers. Considering the fact that the forms of asphalt pavement potholes, subsidence and cement pavement potholes (collectively defined as pavement pothole-subsidence) are similar and they can influence traffic flow significantly, we put forward to use indexes such as Tangential Diameter Length, Normal Diameter Length, Depth, Lateral distance, etc to describe the characteristics of pothole-subsidence. According to different wheel paths & speed, driving modes was classified into several types, influences of various pothole-subsidence on driving mode and speed was analyzed.
Study on the Characteristic of Eye During Traffic Operation
Authors: Xu Hui Zhi , Wang Yu Ping , Wu Chong , Cheng Guo Zhu , Pei Yu Long
Published: July 2012

To design vehicle auxiliary equipment, it need master the characteristic of eye. The paper adopted iView X HED as equipment to get the characteristic of eye during traffic operation, results could be treat as experiment research. The paper collected the data of eye, and adopted location, during, blink time, blink frequency, transient of eye focus as parameters to study the characteristic of eye, and given a measurable value to them. It was a foundation to further research of driver’s characteristic. The result shown that: the location mainly in ahead, the average value of time and blink was 0.3098s and 0.231s. Frequency of blink was respond to traffic condition, the mainly direction of transient was left and right.
Electrical and Optical Properties of Indium Tin Zirconium Oxide Films at Different Annealing Treatment Temperatures
Authors: Chai Jian Guo , Zhang Bo
Published: July 2012

Indium tin oxide (ITO) and indium tin zirconium oxide (ITZO) films were deposited on glass substrates at room temperature by magnetron sputtering technology with one or two targets. Electrical and optical properties of ITO and ITZO films by air-annealing treatment were contrastively studied. ITZO films provided with the preferential crystalline orientation change from (222) to (400) plane, as well as the increase in grain size and the decrease in surface roughness. As result, zirconium -doping remarkably improved the optical-electrical properties of the films deposited at room temperature. The resistivity of ITO and ITZO films showed the trend which includes first dropping and then rising, which was closely related with the variations of carrier concentration and mobility. ITZO films had high optical transmittance of above 80% at lower annealing temperature. ITZO films prepared by co-sputtering reveal better optical-electrical properties.
The CT Mountings’ Quality Control Produced by Furan Resin Self-Hardening Sand
Authors: Hao Hong Yan , Ji Qing Shan
Published: July 2012

On the basis of the CT mountings’ technology characteristics produced by Furan resin self-hardening sand, and aiming at the easy appearing defects in the progresses, the reasonable solution had proposed. Practice has proved that, through the scientific selection of raw and auxiliary materials, controlling the molding the environment conditions and strict management of key processes, can improve product quality to meet customer needs.
Compressive Properties of AM60 Magnesium Alloy by High-Pressure Solution and Subsequent Atmospheric-Pressure Aging Treatment
Authors: Wang Shu Ying
Published: July 2012

As-cast AM60 magnesium alloy was solid dissolved with exercising different pressures (atmospheric-pressure, 3, 4 and 5 Gpa) to it and subsequently aged for 10 h at 200 °C under atmospheric-pressure. The aging alloys were characterized by optical microscope, and their compressive properties were investigated by a Gleeble-3500 hot-stimulation machine. The results show that, compared with exercising atmospheric-pressure during solution treatment, exercising high-pressure during this process causes that the α-Mg grains of the subsequent aging alloy are more fine and uniform, while the β-Mg17Al12 phases transform into fine particles and aggregate to form gobbets or strips. With increasing the pressure gradually, the compressive strength of the aging alloy increases up to 4 Gpa and then decreases, while the maximum plastic strain decreases up to 4 Gpa and then increases.
Study on the Preparation Technique and Magnetostriction of Sinter Tb0.7Pr0.3Fe1.80 Alloy
Authors: Yin H.Y. , Liu X. , Wang R. , Liu Jin Jun , Lin R.R. , Liu X.C. , Si P.Z.
Published: July 2012

Mechanical alloying (MA) and subsequent solid sintering process was used to prepare the Pr-containing pseudobinary Tb0.7Pr0.3Fe1.80alloys. The structural and magnetoelastic properties were in comparative investigated by means of x-ray diffraction and a standard strain technique for sinter and composite samples. The high Pr-content (Tb,Pr)Fe2Laves phase with MgCu2-type structure for the composition Tb0.7Pr0.3Fe1.80 were synthesized by MA plus annealing at 500 °C.
Effect of Antimony on Microstructure of Mischmetal-Containing AZ31 Magnesium Alloy
Authors: Zhang Bao Feng , Chen Xiao Wei , Zhou Ya Jun , Li Qing Kui
Published: July 2012

Effect of antimony on the microstructure, especially on the morphologies of rare earth-enriched phases, of mischmetal -containing AZ31 alloy was studied. The results showed that, by the addition of 0.8%Sb, the rare earth-enriched phases in AZ31-1.0％MM were transformed to dispersive tiny sphere-like Al-rare earth-Sb phases from coarse needle-like Al-rare earth phases. Meanwhile, rare earth-enriched phases transferred into α-Mg crystal grains from grain boundaries. On the other hand, the distribution of β-Mg17Al12 phases became more dispersive.
Synthesis of Diamond-Like Carbon Film on Copper and Titanium Interlayer by Vacuum Cathode Arc Evaporation
Authors: Zhou Bing , Jiang Xiao Hong , Liu Zhu Bo , Rogachev A.V. , Shen Rui Qi , Piliptsou D.G.
Published: July 2012

Using direct-current (DC) and pulsed double-excitation cathode arc plasma technique, diamond-like carbon (DLC) bilayers with nano-scaled interlayer of Cu and Ti were synthesized on silicon substrate. The effect of interlayer on the structure, morphology and mechanical properties of bilayer films were investigated. The change in bilayers structure occurred during interlayer introduction and greatly affected the hardness and internal stress of bilayers. Interlayer nature changed the microstructure of bilayers that in the thickness and element content of diffusion layer. Ti/DLC bilayer exhibited a similarly morphological character to DLC monolayer, whereas Cu interlayer in DLC films leaded to a formation of nanostructured surface and lower root mean square roughness due to the absence of Cu-C bond.
Preparation and Performances of Li4Ti5O12/C as Anode Material for Lithium-Ion Batteries
Authors: Gu Fang
Published: July 2012

Lithium titanate was poor conductive materials, this disadvantage limited its commerical use in high current applications for future hybrid electric vehicles. Li4Ti5O12/C has been examined in order to improved the electronic conductivities. We selected polyvinyl alcohol (PVA) as the carbon source to synthesize Li4Ti5O12/C composite. Different PVA additions at m(PVA)/m(Li4Ti5O12) = 5%, 10%, 15% were investigated along with the structure and electrochemical performances. The addition of PVA with a amount of 5% and 10% whould significantly improved electrochemical performance of Li4Ti5O12. When charged at 0.5 C rate, both of the samples could maintain an initial reversible capacity of about 146 mAh/g and 159 mAh/g.
Experimental Researches on Relation between Martens Hardness and Traditional Mechanical Properties
Authors: Yang Wang , Wang Jing , Zhang Yi Liang , Liu Yang
Published: July 2012

For finding the relation between Martens hardness and Vickers hardness, Rockwell hardness, tensile strength, yield strength, research are done on carbon alloy steel by experiment, linear regression analysis and derivation of equation .Martens hardness, Vickers hardness and Rockwell hardness of 30 samples which contains 3 material and 10 hardness levels are tested by ZHU 2.5 hardness tester. On the basis of 180 groups of data obtained and analyzed from instrumented indentation experiments, mathematic model between Martens hardness and Vickers hardness is established, by linear regression analysis. And mathematic model between Martens hardness and Rockwell hardness, tensile strength, yield strength is established on that basis. By means of comparing the value calculated by the mathematic model and obtained from tensile test using Electronic universal testing machine, the accuracy of the mathematic model is verified. The result show that the relative error of the four mathematics models which established in this test is below 5%, and the four mathematics models can be applied to the practical engineering application.
Density Functional Theory Calculations of the Radical Scavenging Activity of Alkannin Derivatives
Authors: Guo Xiang Peng , Jin Rui Fa
Published: July 2012

The structural and electronic properties of alkannin and its derivatives and their radicals were investigated at density functional level. It turned out that the presence of the dihydroxy functionality increases the radical stability through hydrogen bond formation. The hydrogen atom transfer for alkannin derivatives is difficult to occur compared with zero compound phenol. However, alkannin derivatives appear to be good candidates for the one-electron-transfer, particularly for alkannin derivatives with –OCOCH=CH(CH3)2 and –OCOCH2CH(CH3)2 groups. It suggests that 1–7 are expected to be the promising candidates for radical scavenging activity compounds because The ionization potential (IP) values of 1–7 are lower than that of the zero compound phenol.
The Application on Laser Welding in the Welding of Hot Rolled Sheet
Authors: Yang Yang , Wang An Min
Published: July 2012

Through a new laser welder welding parameters to optimize the welding of high strength steel, thereby contributing to acid-rolling unit efficient and reliable production and energy save. In order to ensure the welding quality, every few volumes, and will cut the crescent do cupping experimental results to determine whether you need to re-welding, to prevent acid rolled off with production efficiency.
The Research on Analysis and Control of Cracks of Masonry Structure
Authors: Ma Shou Cai
Published: July 2012

Through the cracks because of influence of external temperature, and mixed thermal stress in the approximate calculation of the proposed measures to prevent the multi-storey top floor vertical wall cracks, to be prevented in the design, engineering examples by design better buildings products.
Analysis of a Novel SAW Acceleration Sensor with Cantilever Beam Using ST-X Quartz
Authors: Jiang Hua , Lu Wen Ke , Li Yuan Yuan , Shen Shi Gen
Published: July 2012

In order to improve the signal-noise rate (SNR) of the acceleration sensor system, this article analysis of the design principles of a novel surface acoustic wave (SAW) acceleration sensor with cantilever beam using ST-X quartz. The main structure of the novel SAW acceleration sensor is composed of two oscillator, a mixer and a low pass filter to get the difference frequency structure, which can inhibit temperature drift and lateral acceleration impact. The two oscillator have the same structure, which is constitute of a low insertion loss SAW delay line and a feedback amplifier. This article shows the simulation results of the force analysis of the cantilever beam free end using ANSYS finite element analysis software. The novel acceleration sensor has potential applications in portable mobile devices or automotive airbags fields.
Atom Transfer Radical Polymerization of 3-O-Methacryloyl-Diacetone-D-Glucose
Authors: Qu Jian Bo , Shao Hui Hui , Zhang Xiao Xiao
Published: July 2012

Living radical polymerization of 3-O-methacryloyl-diaceton-D-glucose was carried out by the atom transfer radical polymerization (ATRP) method with an alkyl halide/copper-complex system. The effect of initiators, catalysts, ligand, and temperature on polymerization was studied in detail. Under the optimum condition, the time-conversion first-order plot was linear and the polydispersity of giycopolymer is relatively low, indicating that the polymerization is well controlled.
Analysis on Trajectory of Combination Mechanism of Double Cranks and Gears
Authors: Shentu Liu Fang , Yu Jing Li
Published: July 2012

In this paper, focusing on the five-bar linkage and gear combination mechanisms which can complete a whole rotation, the Visual Basic6.0 (VB) programming language is applied to produce a set of system, which can dynamically simulate the motion of the five-bar linkage and gear combination mechanism and display the linkage curve with variable parameters. Based on this system, rules of the trajectory of the hinge point C of two links changing with the physical dimensions and gear ratio of the mechanism are studied.
Development of Constitutive Model of EA4T High-Speed Train Shaft Steel Based on Internal-State-Variable Method
Authors: Huo Yuan Ming , Wang Bao Yu , Lin Jian Guo
Published: July 2012

The internal state variable method may be the best tool，offering researcher the model framework，certainly based on physical mechanism. A constitutive equation model framework，reported in this study， has been proposed to predict the distribution of stress of EA4T steel. The constants ，arising in this model ，are determined using an evolutionary programming (EP) optimization technique . A good agreement between the computational and experimental results was found.
Design of Intelligent Winding Machine for Tassel Thread Based on Stepping Motor
Authors: Shen Hong , Shao Feng , Xu Jun Peng
Published: July 2012

On account of the end splitting and dropping thread problem for domestic winding machine during tassel thread production process at present, an intelligent system with subdivision driving module TB6560AHQ and SANYO stepping motor was designed, which adopted the ATMEL89S52 MCU as the core controller. The system achieved precise control of some parameters during the course of tassel thread winding such as torque, direction of rotation, speed, cycle laps, twist, etc. It also reduced the worker’s labour intensity and improved the production quality and efficiency of the tassel manufacturing, moreover, this winding machine has the advantages of simple structure, high torque, high reliability and low cost. It can meet the various control requirements for different tassel thread winding and have a considerable market prospect.
Statics Analysis on Workbenches of Three Kinds of Electromaglev Linear Feed Unit
Authors: Xiao Long Xue , Wu Guo Qing , Zhang Xu Dong , Zhu Wei Nan , Mao Jing Feng , Qian Xiao Lei
Published: July 2012

Based on the disciplines theory such as the mechanics and electromagnetics, this paper presents three kinds of electromaglev linear feed unit, with the help of the 3D modeling software Solidworks and large general purpose finite element analysis software ANSYS. The statics analysis on workbenches of the three kinds of electromaglev linear feed unit are made by using of ANSYS, then the results are analyzed and compared. It can be identified as the conclusion that, the structural stiffness on workbenches of the three kinds of magnetic linear feed unit can basically meets the requirement, and all of them can be selected as the needed structural design. But the four-L separately suspended and oriented type electromaglev linear feed unit has the better structure stiffness, and take the weight, cost, load capacity and dynamic characteristics and other factors into account, we preferred to choose the workbench design of the four-L-pillar separately suspended and oriented type electromaglev linear feed unit.
Vibration Response of a Thin-Walled Cylindrical Pipe with Liquid
Authors: Wei Yu Lan , Li Bing , Gao Li , Dai Ying Jun
Published: July 2012

Vibration characteristics of the thin-walled cylindrical pipe are affected by the liquid within the pipe. The natural frequencies and vibration modes of the pipe without liquid are analyzed by the theory of beam bending vibration and finite element model, which is based on the Timoshenko beam model. The first three natural frequencies and vibration modes of the pipe with or without liquid are acquired by experiments. As shown in the experiment results, the natural frequencies of the containing liquid pipe are lower than the natural frequencies of the pipe without liquid.
Modeling and Simulation of BLDCM Drive System Based on Z-Source Converter
Authors: Gao Wen Gen , Yuan Xiao Lin , Zhang Hai Yan
Published: July 2012

A BLDCM drive system based on Z-source converter is proposed in this paper, it can be integrated to control DC bus boost and BLDCM speed by Z-source transformation technology, which not only improve energy efficiency but also raise the system security. The algorithm of PWM is applied to control Z-source inverter, which is simulated by Matlab/Simulink, the results are shown to verify the features of the Z-source inverter for BLDCM drive system, and confirm that the method is correctly and availably.
Corrosion Behavior of Copper in Halide Solutions
Authors: Yang Hai Jiao , Zhang Sheng Tao , Zhang Lei
Published: July 2012

The corrosion behavior of copper in halide solutions was investigated by cyclic voltammetry, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). On this basis, the mechanism of electrochemical corrosion behavior of Cu in halide solutions has been analyzed. The study explores the corrosive effect of the halide ions on copper materials and provides a theoretical basis for the inhibition of halide ions on the corrosion of copper materials.
An Intelligent MPPT Algorithm for Vertical-Axis Wind Turbine System
Authors: Yang Kun , Wu Guo Qing , Mao Jin Feng , Zhang Xu Dong
Published: July 2012

This paper focuses on an intelligent MPPT (maximum power point tracking) algorithm for permanent magnet vertical-axis direct-drive wind turbine systems. The relationship between generator speed and buck convert’s duty ratio is analyzed. then, the output and the speed of wind turbine are controlled by convert’s duty ratio. In this way an intelligent MPPT algorithm, the different step length is given in different directions, is used to this system. At last, the system is simulated by software, and the simulation results indicates that compared with the conventional MPPT strategy, the rapidity and the stability are increased by intelligent MPPT algorithm.
Electromagnetic Drive of Room-Temperature Ionic Liquids and Application
Authors: Wan Jing , Liang Chong Cheng , Yan Feng , Gu Ke , Zhang Shuai , Xie Zhi Guo , Lin Mu Sen
Published: July 2012

Room-temperature ionic liquids are new emerging green material. They have good chemical and thermal stability, negligible vapor pressure, nonflammability, high ionic conductivity, transparence, and a wide electrochemical window. So the ionic liquid material strongly tempts many researchers. But ionic liquids are usually applied in chemistry and rarely applied in physics. In fact ionic liquids are good photoelectric medium material owing to its well ionic conductivity, transparence. However, in applications, the drive of ionic liquids is the key technic and is also a bottle-neck. Here a kind of electromagnetic drive way is presented, There are not any mechanical moving elements and the drive is bidirectional. Theory and experiments indicate the drive pressure and flow rate are distinct undering a few voltages and 0.5T magnetic flux density. So this drive way can be used as a low power liquid pump. Latency applications in Microfluidics, Optoelectronics and industry are given.
Research on the Control of Oxide and Nitride Inclusions in Steelmaking
Authors: Zhao Ding Guo , Wang Shu Huan , Zhang He Jun
Published: July 2012

The contents of oxygen and nitrogen were important effect on the high speed wire in smelting high carbon steel. Sampled from the process of producing wire rod in Xuanhua iron and steel company and analyzed the contents of oxygen and nitrogen. The quality and size of oxide and nitride were numerical statement in differernt terms. The results were shown that the size of micro inclusion was less than 15 μm, and the inclusion size was not big, but the quantity was large. The quantity of micro inclusions in wire rod was about 10 /mm2 (equivalent diameter of 5 μm). Through the practice analysis and research, we put forward the measures of inclusion control for 65 steel including raw material requirement, improving of the converter, LF refining and continuous casting operations.
Feasibility Study on Tilt Double Steel Arch Tower Segment Cantilever Assembling at the Site
Authors: Zeng De Rong , Song Cheng Wei
Published: July 2012

Feasibility on tilt double steel arch tower segment cantilever assembling at the site is analyzed by finite element simulation, and the steel arch tower deformation and stress of each step during segment cantilever assembling process are gotten, the cantilever assembling program is improved by adjustment of the first time tension of the horizontal cables and temporary cables. These results are successfully used to control deformation and stress of steel arch tower during segment cantilever assembling, which provides the correct of simulation analysis and pioneers a new approach of similar projects design and construction.
Force Analysis and Numerical Simulation of Screw Mechanism for Subsurface Robotic Exploration
Authors: Jian Xiao Gang , Yang Peng Chun , Wang Ye Feng
Published: July 2012

A scheme of drilling robot, which is propelled by the screw mechanism, is proposed for subsurface exploration. Firstly, in order to analyze the forces acting on the screw, theoretical model for the working principle of the robot is built, and by this model the soil friction moment, propelling and resisting forces can be calculated. Secondly, with the help of ANSYS/LS-DYNA, the dynamic numerical simulation of the interaction between the screw mechanism and the soil is conducted and the results verify the feasibility of the screw propelling method for the robot.
FEA on Vibration Characteristics of a Shrouded Turbine Blade
Authors: Zhao Wei Qiang , Liu Yong Xian , Lu Mo Wu
Published: July 2012

This paper introduces a FEA method for vibration characteristics analysis of an aero-engine shrouded turbine blade and makes an actual modal analysis of this shrouded blade based on this method in UG software environment. The first six natural frequencies and mode shapes of this shrouded blade are calculated. And also, the dynamic characteristics of the shrouded turbine blade are discussed in detail according to the analysis results. The FEA method and the vibration characteristics analysis results in the paper can be used for optimal design and vibration safety verification of this aero-engine shrouded turbine blade.
Application of Computer Simulation in Materials Science
Authors: You Su Ping
Published: July 2012

The computer simulation methods have become more and more widely used technique in materials science research. This paper discusses the importance of the application of computer simulation in the field of materials science. There are many application areas of computer simulation in materials science including the heat treatment, material microstructure, corrosion and protection, casting, and material design areas. It can be seen from the results of these applications that computer simulation technology is an efficient, realistic way to fully reflect the variation of the sample in a variety of research process. It can get rid of a rough qualitative estimate of production of the backward state.
Simulation Techniques in the Research of Structure and Performance of Nanosized Materials
Authors: Seng De Wen
Published: July 2012

Due to their unique structure and performance, great attention to nanosized materials has increased in past years. Advanced information and simulation technologies provide an understanding of nanosized materials at the atomic scale with an unprecedented level of detail and accuracy and make nanosized materials design and performance prediction possible. Computer simulation theory and methods in the research of nanosized materials are summarized. The progress in computer simulation of nanosized materials, especially their mircostructure, mechanical, thermodynamic, electric, magnetic properties, is discussed in detailed. Some basic problems in structure and performance research of nanosized materials are also elaborated.
Finite Element Analysis of Temperature Field of Traction Motor
Authors: Zhu An Xing , Yang Zhi Xiong , Cui Yi
Published: July 2012

Due to the fact of immeasurable inner temperature of inverter-fed traction motor, three-dimension finite element model of part of rotor iron core and half a rotor bearing were established. The convective heat transfer coefficient between the air gap of motor and rotor surface were calculated by the heat transfer and fluid mechanics theory. The influence of temperature rise on the stator and rotor resistance was considered for thermal loss calculation. The influence of the end of stator and rotor on axial temperature distribution was also taken into account. Then three-dimensional transient temperature field of the motor was simulated at the rated load. Temperature field with different loads was also computed. The aim has been to optimize the design with respect to the transient stresses. According to contrastive analysis compared with other method, it demonstrated the accuracy of simulation model and thermal field calculation results.
Simulation on Structures and Characteristics of Functional Materials
Authors: Lu Sai Qun
Published: July 2012

Computational materials and materials design combined with computer techniques are very important contents in materials science. The paper used computer simulations and modeling to study the structures and characteristics of functional materials. It used first principle theory or molecular dynamics methods to study the electronic structures, conductive properties and their relationship of the cathode material. It used molecular dynamics method to study the embedded light small atomic or molecular lamellar graphite thermal behavior of the system; the use of first principles methods to manually control the formation of chemical bonds in the scientific field of single molecule and its characteristics.
Visualization of Composite Materials’ Microstructure with OpenGL
Authors: Seng De Wen
Published: July 2012

The composite material is made by two or more of the same nature, substance or material combinations together new material. Through appropriate methods, different materials are to be combined with each other sets’ advantages of various materials into one, and to be available to the various properties of new materials. This is the fundamental reason for the rapid development of composite materials and composite technology. The fiber reinforced composite fibrous material in such materials as filler, in order to play an enhanced role. The fiber reinforced composite materials and fiber reinforced ceramic matrix composites are discussed in detailed. OpenGL is used to implement visualization of composites' material microstructure, which can specify fiber parameters to gain a basis of visualization.
Effect of Deposition Conditions on the Characterization of Cu(In,Ga)Se2 Precursor Films by Sputtering Process
Authors: Lin Yi Cheng , Ke Jia Hong , Chen C.C.
Published: July 2012

In this study, Cu(In,Ga)Se2 (CIGS) thin films were deposited onto bi-layer Mo coated soda-lime glass by sputtering a chalcopyrite CIGS quaternary alloy target. The influence of sputtering power and substrate temperature on the characterization of CIGS precursor films was investigated. Experimental results demonstrate that the CIGS quaternary target has the characteristics of chalcopyrite structures. The samples deposited at a sputter power of 1.5 W/cm2 (both as-deposited and after annealing) exhibited superior uniformity, and the phenomenon of composition loss resulting from annealing was not drastic. The composition distribution of as-deposited film produced at a substrate temperature 373 K approached that of ideal stoichiometry.
Research of Adsorption Performance of V (V) and Mo (VI) on Collagen Fiber Immobilized Bayberry Tannin
Authors: Hu Wei , Zhang Zhen , Liu Hui Yun , Wang Ru
Published: July 2012

The adsorption behaviors of V(V) and Mo(VI) on the collagen fiber immobilized bayberry tannin (IBT), a new kind of adsorption, were investigated. It was found that at 323K, pH=2.0, the adsorption capacities of V(V) on 0.100g adsorbent was 1.03mmol/g in 100ml of 1.960mmol/L V(V) solution, and that of Mo(VI) was 0.86mmol/g at 323K, pH=4.0, with 100ml of 1.042 mmol/L Mo(VI) solution. The effect of pH on the adsorption capacity of V(V) and Mo(VI) was conspicuous. The adsorption capacity of Mo(VI) decreased with pH increasing, and the maximal adsorption capacity of V(V) was observed at pH4.0. Langmuir equation was used for the description of adsorption isotherms of V(V), while Freundlich equation could be well described that of Mo(VI). The adsorption kinetics of V(V) and Mo(VI) can be well described by the pseudo-second-order-rate model and the adsorption capacities calculated by this model are very close to those experimentally determined. The adsorbent can be regenerated by using 0.1mol/L HCl and 0.02mol/L EDTA in tune as desorption agent after the adsorption of V(V) and Mo(VI). In the desorption process V(V) and Mo(VI) were utilized respectively. These facts implies that the adsorbent can be used for the separation of V(V) and Mo(VI) in aqueous.
Extraction Behavior of Rare Earths in Ion Liquid Extraction System Using 1-Butyl-3-Methyl-Imidazolium Hexafluorophosphate and 5,7-Dichloro-8-Hydroxy Quinoline
Authors: Pan Zhong Wei , Zhao Sheng Guo , Wu Tian Ci , Pan Jin Ding
Published: July 2012

The extraction behavior of five rare earth ions (RE3+) was investigated in ionic liquid (IL) extraction system using 1-butyl-3-methyl-imidazolium hexafluorophosphate ([Bmim]PF6) ionic liquid as extraction solvent and 5,7-dichloro-8-hydroxy quinoline (HQ) as extractant. The extraction percentage of RE3+ using [Bmim]PF6 was less than 8% without HQ. When sufficient HQ was included in IL phase, the extraction percentage of RE3+ could be higher than 99% except La3+. The extracted species in the RE3+-[Bmim]PF6-HQ system was neutral REQ3 and complete recovery of RE3+ extracted into [Bmim]PF6 can be achieved using the mixture of hydrazine hydrate and ethylenediamine tetraacetic acid (EDTA) as stripping agent. [Bmim]PF6 can be recycled in the experiment.
Effect of Drying Methods on Physical Property of the Ultrafine CeO2 Powder
Authors: Hu Yan Hong , Li Mei , Liu Zhao Gang , Wang Mi Tang , Wu Jin Xiu
Published: July 2012

The ultrafine CeO2 powder was prepared using NH4HCO3 as precipitation agent. The effects of six drying methods, such as room-temperature drying、common oven drying、microwave drying、organic solvent displacement drying、freeze drying、vacuum drying, on hard agglomerates and physical property of CeO2 were studied. The results showed that freeze drying is more effective to prevent the ultrafine CeO2 powder from hard agglomerates. The ultrafine CeO2 powder with small mean particle size and uniform distribution and large specific surface area，was obtained by freeze method.
On-Line Measuring System Using Isotope to Gauge Film Thickness
Authors: Lin Li Zong , Wang Tao , Zhang Ji Sheng
Published: July 2012

On-line system was developed to gauge film thickness using isotope, by which the problem of difficulty in measuring wide film thickness was resolved. Two-point method, determining working curve of gauging system, was introduced, by which time spent on experiment could be decreased, and adaptability of working curve under different condition was improved. After analyzing measuring errors, emendation method for every error source was discussed .Method taking count of pulse number within a period of time was applied, by which measuring precision was improved, so this method can be used widely in other applications .This measuring system has obtained satisfying effect in measuring film thickness, and products can be bought in market .
Semi-Global Adaptive Control Using Barrier Lyapunov Functions for a Class of Uncertain Nonlinear Systems
Authors: Chen Peng Nian , Sun Ling Ling
Published: July 2012

This paper deals with the problem of adaptive control for a class of nonlinear systems. The system considered in the paper contains non-parameterized uncertainties and periodic disturbances. A semi-global adaptive control method is proposed using the barrier Lyapunov functions. The method does not need to assume that the solution of the closed loop system remains in the domain of approximation by neural networks and guarantees that the solution of the system converges to zero.
Target Damage Assessment Based on the Detection Information
Authors: Li Tao , Chen Li , Xu Jing Song , Ma Zhi Jun
Published: July 2012

With the wide application of all kinds of precision guided munitions, the rhythm of combat become faster, the environment of battle field become more complicated. It brings a great challenge to the battle damage assessment. the basic principle of battle damage assessment based on detection information is analyzed. Pretreatment and reliability analysis of battle field information and target function damage are elaborated. Single function damage analysis and target damage assessment of the Aircraft-borne guidance ammunition technical area are realized, based on target function damage analysis and fuzzy multivariate theory analysis. With the widely application of all kinds of precision guided munitions, the cost of combat grow rapidly，the rhythm of combat become faster, the environment of battle field become complicated， the damage effect to the target of the evaluation has brought an unprecedented challenges. At present , our army damage effect evaluation of target research has just started, there is no perfect theory system and mature evaluation method, so, target damage effect evaluation model and the method has important practical significance, on account of the scene to collect information on target is the important basis of damage effect evaluation, therefore, how to use all kinds of target damage information damage effect evaluation decision target efficiently collecting from battlefield is the primary problem studying damage effect evaluation.