bluuebunny/crossref_metadata_2025 huggingface dataset:
Pultrusion Technology Optimization for Hybrid Fiber Composites Based on DSC and Mechanical Property Testing
Authors: Chen Li , Zhao Qi Lin , Jiang Ke Bin , Ding Yong
Published: July 2011

In the interest of improving the curing effect and mechanical properties of pultruded carbon/glass bybrid fiber composites, the DSC (Differential Scanning Calorimetry) technology was introduced and the curing DSC curves for the hybrid fiber composites at 4 different heating rates was attained. Then the range of the processing temperature for the three-stage heating pultrusion was primarily determined with T-β method. Subsequently a kind of carbon/glass hybrid composite pole with a diameter of 11mm was selected as the research object, and was manufactured with varies of processing temperatures and speeds. The produced poles were mechanically tested to investigate the effect of processing parameters on the mechanical properties of the composite, so as to further more ascertain the processing parameter ranges fitting to this material formula. As the result shows: the pultrusion processing parameters for the hybrid fiber composite acquired in this study can satisfy the require of manufacturing; compared with the traditional method that attain processing parameters by experience, the method for attaining processing parameters suggested in this paper is more efficiency, more economical and more accurate.
Study on Formation and Exfoliation Mechanism of Alloy TP347H’s Oxide Scale in Supercritical Boiler
Authors: Zheng Jin Xi , Ai Zhi Hu , Liu Ding Ping
Published: July 2011

The paper addresses the assessment of the steam-side oxidation behavior of alloy TP347H tubes in supercritical boilers.The high temperature heating surface of supercritical boiler can easily form the oxide scale on the inside surfaces of steam tubes after a period of operation. When accumulated to a certain amount, the oxide scale would exfoliate. It could influence the actuating medium flowing and heat transferring, cause overheating or even the explosion of heating surface. The oxide scale sampled on heat-absorbing surface of alloy TP347H tubes was examined. The oxide exfoliation sampled was studied experimentally by energy dispersive spectrometer and the X-ray diffractometer. The constituent elements and structural features of oxide scale in TP347H tubes were emphatically analyzed. The mechanism of steam-side oxidation and scale exfoliation in the TP347H tubes, as well as its influence factor, were described. It is found that the temperature is one of the most important influences. The measures that controlled the oxide exfoliation on a large scale were brought forward so as to provide a scientific guidance for reducing the oxide scale formation and avoiding tube bursting for over-temperature.
Structure and Properties of Calcium-Magnesium-Silicate Ceramic Fiber with Nd2O3
Authors: Liu Hao , Wang Xi Tang , Wang Zhou Fu , Zhang Bao Guo
Published: July 2011

Structure, viscosity and crystallization behavior of CaO-MgO-SiO2 ceramic fiber with Nd2O3 were investigated by DTA, XRD and FTIR techniques. The results show that the addition of Nd2O3 enhanced the fiberization by extending the viscosity curve of the glass melt to lower temperature and improved the melt fiberizability. With the reinforcement of silicate glass network by Nd3+, the precipitation of crystals in fibers was inhibited at high temperatures.
Study of Construction Management Maturity Model
Authors: Xu Chao , An Yu Hua
Published: July 2011

The construction management maturity model for the proceeding constuction is mainly studied in this paper. As one of the methods of construction management of project, the construction management maturity model can not only be used for evaluating of the construction management ability but also assess the current construction management level of engineering indusdtries to find the gap and provide the approaches of continuous improvement for engineeringl enterprises. In the paper, the characteristics of construction management maturity model of engineering enterprises are first introduced, and then some international construction management maturity models widely applied are compared. Based on the above, the present situation of application of the construction management maturity model in the engineering industries of China and some main problems needed to be resolved for establishment of the construction management maturity model suitable to the architectural enterprises of our country are finally pointed out.
Sintering Kinetics of Self-Lubricating Ti-48%Al-2%Nb-2%Cr Alloys with Fluoride Lubricants
Authors: Yang Li Ying , Wang Shou Ren , Zhu Bo , Hou Lin
Published: July 2011

The study reports the sintering kinetics of Ti–48Al–2Nb-2Cr composites (TANC) with addition of different weight contents of LiF, NaF,CaF2and 38%CaF2-62%BaF2eutectic solid lubricant (BC) using OM, SEM and DSC. The microstructure of TANC composites with different CaF2and BC content is analyzed. Additions of solid lubricants to TANC matrix have significant influences on densification degree of the composites. Densities increase with sintering temperature and time, decrease with addition amount of solid lubricant.
Proportion Design of Concrete with Gravel-Crushed Proto-Machine-Made Sand
Authors: Li Chang Yong , Sun Qiu Yan , Li Feng Lan
Published: July 2011

Experiments were conducted to study the workability of fresh concrete and basic mechanical properties of hardened concrete with gravel-crushed proto-machine-made sand. Effects of water to cement ratio and content of stone powder were mainly considered. Based on the test and before, the values of practical parameters in formula are obtained for calculating mixed strength of concrete, and the beneficial range of water to cement ratio is proposed. Meanwhile, the reasonable water content, sand ratio and content of stone powder are also suggested.
The Influence of Humidity on Burning Perfectibility of Molded Combustible Cartridge Case
Authors: Jia Hao Nan , Lu Gui E , Jiang Jin Yong , Cao Hong An
Published: July 2011

Studied the hygroscopic properties of a molded combustible cartridge case by weighing method. Investigated residue formation of cylinder materials with different water content by nitrogen-bomb tests. The results show that the higher the relative humidity, the greater the equilibrium moisture content of the inside-wall material. When the relative humidity was about 90%, its absorption rate was about 5.4%. Compared with its outside wall, the inner parts have much stronger moisture absorption properties. The combustion remains grew in quantity generally with the increase of moisture content.
Preparation and Features of Nano-ZrO2 / HA Coating on Surface of Titanium Materials in Dental-Implant
Authors: Pang Xiao Feng , Huang Yong , Cao Xian Yu
Published: July 2011

The nano-hydroxyapatite/zirconia coating of double layers on surface of titanium allay materials have been prepared using electrochemical method. The features and structures of the composite coating materials are studied and analyzed by the Scanning electron microscope (SEM) and EDAX measurement. The results show that nano-HA/ZrO2 are densely and uniformly deposited on the surface of titanium allays in ionic form, a stable gradient composite coating, in which the nano-zirconium oxides (ZrO2) are homogeneously distributed between HA and titanium surfaces, are obtained. The tensile strength experiment exhibits that the adhesion or combined strength of the coating with the titanium surface is higher and about 17GPa, which manifests the nano-HA/ ZrO2 coating is successfully combined on the surface of the titanium allay materials. The biological experiments represent that this material can be used in repairing of bone and medical dental- implant of teeth.
Study of Anode Modification and Bias Voltage Treatment on Organic Solar Cells with Rubrene/ C60 Heterojunctions
Authors: Wu Bing , Liu Peng Yi , Chen Zi Guo , Cao Jing
Published: July 2011

The organic solar cells with a structure of ITO/Rubrene(35 nm)/C60(35 nm)/BCP (6 nm)/Al(150 nm) was fabricated and the influence of anode modifying layer(MoO3) and 3V bias voltage treatment on device performance were investigated. The experiment results show, inserting anode modifying layer, the open-circuit voltage and the power conversion efficiency were almost increased by a factor of 5.3 and 11.3, respectively. The anode modifying layer can effectively enhance the built-in electric field and improve dissociation and transport excitons. The bias voltage treatment can improve the performance of defective devices by burning partial defects, but there is little effect for too few defective devices.
Present Situation and Development Perspective of Soft-Contact Electromagnetic Continuous Casting Technology
Authors: Wang Xing Juan , Zhu Li Guang , Liu Ran
Published: July 2011

Soft-contact electromagnetic continuous casting is one of innovative technologies for the development of steel industry. In this paper, the present situation was reviewed from five aspects: the soft-contact mold material and structure parameter design, the electromagnetic field distribution, the meniscus shape and movement behavior, casting slab surface quality improvement mechanism and the method of magnetic fields imposed. The main questions of the technology were analysed, and the remarhable in the process of industrialization were pointed out.
Study on the Microstructure and Property of Manganese Steel Composites Strengthened by Ceramic
Authors: Xie Jing Pei , Zhang Chang Tao , Wang Wen Yan , Wang Ai Qing
Published: July 2011

The high manganese steel composites were successfully developed by different processes. The connection of high manganese steel-ceramic, the microstructure and abrasion performance of the composites were researched by SEM, mainwhile the connection mechanism and wear mechanism were studied. The results show that the grains of the matrix are refined; the connection is fine; the connection mechanism is diffusional bond; The wear surface had relatively shallow gully; Typical TEM morphologies of super-high manganese steel was high density dislocation, deformation bands, twin.
Progress of Research on Chitosan
Authors: She Qiu Sheng , Xie Zhao Hui , Yang Guan Jun , Tian Xun , Xue Yin Lei
Published: July 2011

the Traditional and Degradation Preparation Methods of Chitosan Were Introduced and then the Applications and Development of Chitosan in the Environmental Protection,food Industry , Medicine Field , and Agriculture Were Reviewed , at Last , the Current Status of Chitosan in Our Country, Research and Development Prospects of Chitosan and its Derivatives Were Analysed.
Study on Control Technology of Transverse Corner Cracks on CC Slab for Automobile Frame Steel Plate
Authors: Pan Hong , Wu Guo Rong , Chen Yong , Zeng Jian Hua , Li Zhi Qiang
Published: July 2011

There were serious transverse corner cracks on continuous casting slab of automobile frame steel plate in Panzhihua Steel before, and study on the control of transverse corner cracks had been carried out. Some effective countermeasures are put forward, such as the optimization of ratio of heat flux density on narrow side and broad side of casting slab (RHFD) and mold powder, as well as the stabilization of casting speed and working condition of caster. Industrial test shows that the transverse corner cracks on continuous casting slab have been significantly reduced, and the lines and peeling defects on hot rolled sheet have been eliminated due to the transverse corner cracks.
Synthesis and Characterization of Novel Functional Polymers from Hemicelluloses
Authors: Peng Xin Wen , Ren Jun Li , Zhong Lin Xin , Peng Feng , Sun Run Cang
Published: July 2011

Hemicellulose isolated fromDmMwas converted to novel functional biopolymers by maleylation using maleic anhydride as reactant and LiOH as catalyst. The reaction was performed under various temperatures, times, and the amounts of catalyst and maleic anhydride on the degree substitution (DS) of products were discussed. Comparison of the reaction in different media was discussed in detail. The product had the maximum degree of substitution (DS) of 0.75. Novel functional polymers containing with carbon-carbon double bond and carboxyl groups could be confirmed by13C NMR spectroscopy. The behavior of novel hemicellulosic derivatives was monitored by means of thermogravimetry (TG) and differential thermal analysis (DTA). It was found that the products with a high DS had a lower thermal stability than the native hemicelluloses.
Study on Rutting Resistance of Polyacrylonitrile Fiber Asphalt Mixture
Authors: Yao Li Yang , Ding Ling Ling , Ma Qin
Published: July 2011

This paper evaluates comprehensively the rutting resistance of polyacrylonitrile fiber asphalt mixture by TRLL, AAPA, CPN wheel rutting test and triaxial shear test. The result shows that polyacrylonitrile fiber asphalt mixture is better than cellulose fiber and normal asphalt mixture in improving rutting resistance with any above method. And these methods have relevance in increasing rutting resistance.
The Experiment Study on Making Ultrafine Superfine Nickel Powder by N2H4–KHB Reduction and H2 Reduction
Authors: Dai Shu Juan , Liu Yao
Published: July 2011

The N2H4–KHB reduction then CH3OH watering and H2 reduction system was used to make superfine nickel powder by using nickel sulfate as material.The superfine nickel powder of the specific surface area of the nickel powde being 4.24m2/g, spheric shape with grain size 0.5-0.9μm,nickel content being over 99.5%,The toll nichel recovery being over 99.5% was made on the condition of reaction temperature 60°C, reaction time 150-180min,pH 8.0-8.5,[Ni]=1.25M,N2H4/Ni=1.35（mol ratio）,sodium hexametaphosphate of 1.5‰ as additive，the dosage of KHB of 8.37×10-3g/g Ni and washing by carbinol,reducing by H2.
The Die Design and Implementation of the Path Trail about Step-by-Step Forming Section
Authors: Chen Lin , Wang Yan , Wang Jian Guo , Ding Scott
Published: July 2011

This paper established the model based on Step-by-Step forming in ABAQUS firstly, we set synchronous alternating circular motion on the upper and lower die with the amplitude curve, its has implemented the die design and the path trail about Step-by-Step forming section.
Study on the Preparation of TiN Nano-Particles in a Solidified Low Alloy Steel
Authors: Lin Guo Biao , Wang Zi Dong , Zhang Hong , Gong Rui , Yang Lin
Published: July 2011

By using vacuum melting, nitrogen protection and a high molten flow rate during pouring, many nano-TiN particles with the size of 20~100nm are formed during solidification of the alloy steel composed of C0.12- Si0.24 - Mo0.45 - Cr0.35 - V0.2 - Ti0.29 (wt.%). In addition, there are 0.9-1.4μm micron-sized particles separated by a space of 15~40μm. Precipitable TiN particles greatly refine the microstructure of the alloy steel. In this paper, the thermodynamic, kinetic mechanisms and related factors of TiN formation are analyzed.
Study on the Preparation of Cu/n-SiO2 Composite Particles by Mechanical Milling
Authors: Du Jian Hua , Li Yuan Yuan , Zheng Xiao Hui
Published: July 2011

Copper coated nano-SiO2 composite particles were prepared by mechanical milling technology. The effects of milling time on morphology, granularity, component and microstructure of the composite particles were characterized by scanning electronic microscope, laser particle size analyzer, energy depressives spectrometer and transmission electron microscope, respectively. Results showed that dendrite composite particles change to the flaky, and then to spherical ones with the milling time increasing. The particle size decreases firstly and then increases with the milling time increasing. The n-SiO2 particles disperse more homogeneously in the composite particles with the milling time increasing.
Preparation of Graphene/CdS-Nanobelt Nanocomposites
Authors: Han Peng , Ji Tian Hao , Li Li
Published: July 2011

Graphene/CdS-nanobelt nanocomposites were prepared using a simple mixing process of graphene with CdS nanobelts in distilled water at room temperature. Prior to the preparation of such nanomaterials, graphene was obtained using modified Hummers method and characterized by various measurement techniques. The measurement results demonstrate that graphite oxide in high-concentration hydrazine hydrate solution can be easily reduced into graphene under hydrothermal condition. The measurement results of nanocomposites show that the addition and mixing of CdS nanobelts has not affected on the structure of graphene.
Modelling of Cyclic Plasticity and Viscoplasticity of Directionally Solified DZ125 Superalloy: Part I: Estimating the Parameters of Chaboche Constitutive Equations
Authors: Li Jie Qiong , Wang Li Jun
Published: July 2011

Cyclic plasticity and viscoplasticity of directionally solified superalloy, DZ125, have been described using the Chaboche uniﬁed constitutive model. A set of initial material parameters has been determined utilizing the monotonic, cyclic, relaxation and creep test data of DZ125 at 980°C, while an optimum set of material parameters has been obtained by means of least-square procedure.
Combustion Synthesis and Luminescence Properties of NaY1-XTbX(WO4)2 Novel Green Phosphors
Authors: Qian Xian Hua , Zhang Da Feng , Pu Xi Peng
Published: July 2011

NaY1-xTbx(WO4)2 green phosphors have been synthesized by a facile combustion method. The structure, morphology and luminescence properties of as-synthesized phosphors were characterized via X-ray powder diffraction (XRD), photoluminescence spectra, and decay curve. The XRD results indicate that as-synthesized phosphors exhibit sheelite-type structure without any impurity phase. The as-obtained phosphors emit strong green light centered at 546 nm under ultraviolet light excitation. The lifetimes are about 0.57 ms. The excellent luminescence properties make it a new promising green phosphor for fluorescent lamps application.
Electrochemical Characterization of Metal Oxynitride Thin Film as New Lithium Storage Materials
Authors: Zhou Yong Ning , Fu Zheng Wen
Published: July 2011

Metal oxynitride (VxON, CrxON) thin film has been fabricated by reactive dc sputtering method and annealing process. Its electrochemical properties are investigated in a MxON/Li cell. The reversible specific capacities are around 830 mAh g-1for VxON and 730 mAh g-1for CrxON. By using selected-area electron diffraction and X-ray photoelectron spectroscopy measurements, New electrochemical reaction mechanism is uncovered, which should be responsible for its good electrochemical performance.
Microstructures and Mechanical Properties of Mg-6Al-1Zn-xSn (x=0.5, 1, 2 and 3.5 Wt%) Alloys during Solution Treatment at 420°C
Authors: Wang Xu Dong , Du Wen Bo , Liu Ke , Wang Zhao Hui
Published: July 2011

The effect of solution treatment at 420°C on the microstructures and mechanical properties of the Mg-6Al-Zn+xSn (x=0.5, 1, 2 and 3.5 mass %) alloys have been investigated. The results showed that the Mg2Sn phase was present in both the cast and the heat-treated alloys. The Mg2Sn particles tended to be spherodized during the solution treatment. Amount of Sn increased the tensile strength of the alloys.
A Study of Preference Relation for the Mould Bidding Strategy Based on Rough Set
Authors: Li Guang Ming , Liu Zheng Kun , Zheng Li Xuan
Published: July 2011

Mold quotation is one of the important issues concerns to enterprise. Due to the fact that there is lots of information properties such as uncertain, inconsistent and preference relationship exist in customer assessment. Through the analysis of the customer information investigated, a dominance variable precision rough sets approach is proposed to reduce the redundant information and discover internal relationship between the preference attributes and the basic bidding strategy. Finally an example was used to demonstrate the feasibility of the method.
Synthesis of Bismyristyl Bisulpho Betaine Type Amphoteric Surfactant
Authors: Zhang Rong Ming , Ma Dong Hui , Zhang Zhen Yu
Published: July 2011

A kind of novel betaine type amphoteric surfactant was synthesized using tetradecylamine and pentaerythritol as the starting material. The structure of bismyristyl bisulpho betaine type amphoteric surfactant was identified by FTIR.The influence factors of the synthesis process were studied.The optimal condition of the synthesis was gained. The results have show that the reaction time and mole ratio (Intermediate / Dimethyl tetradecyl tertiary) were 18 h and 0.5/1 at 135°C. Then it was performed the surface tension tests to determine the critical micelle concentration(cmc).
Microscopic Simulation Modeling of En-Route Diversion Strategies for Commercial Vehicle Operations
Authors: Wang Hao , Cheu Ruey , Lee Der Horng
Published: July 2011

Most routing decisions or diversion plans in the literature are made based on the current traffic situation and little attention is paid to future. Such kinds of greedy strategy consistently suggest en route diversion at any point where the alternative route choice is better than the ongoing one. Hence, in the constantly varying real world, excessive diversions may appear and are much likely to create a sort of ‘zig-zag’ effect, eventually leading to a higher cost. A forward-looking diversion strategy considering both real-time and future information is proposed in this paper, and the potential benefits, limitations and difficulties of several diversion strategies are evaluated through microscopic traffic simulations. The research will help logistics companies to assess the benefits of en route guidance system in their day-to-day operations.
The Formalization of Least Privilege Mining in RBAC
Authors: Dong Li Jun , Kang Xiao Jun , Song Jun , Wang Mao Cai
Published: July 2011

Devising a complete and correct set of roles for supporting the least privilege principle has been recognized as one of the most important tasks in implementing RBAC. A key problem is how to find such sets of roles which have the least permissions. However there are too few formalized descriptions and definitions on this problem. In order to provide a material object for researching the least privilege principle, we define the least privilege mining problem (LPMP) and its two variations: δ-approx LPMP and MinNoise LPMP. By showing formalized descriptions, we clarify clearly the methods of discovering least permissions. Correspondingly, we give two simple algorithms to implement the methods.
Image Processing of the Hook on the Catenary Based on Machine Vision
Authors: Yu Jing , Li Chang Chun , Wang Shi Feng , Liu Hua Guan
Published: July 2011

In this paper, the idea loading and unloading workpiece on catenary based on machine vision has been proposed, for the feature of the hook on catenary, we first used gray-scale transformation, used a variety of edge detection operators to detect the image edge, then combine prewitt edge detection operator and Otsu to segment the hook image, the result shows that this method can extract the image edge of hook effectively, lay a good foundation for loading and unloading workpiece automatically.
A Dynamic Traffic Coordination Control Model of Congestion Based on Synergetics
Authors: Gao Peng , Yang Zhao Sheng
Published: July 2011

The cooperation of urban traffic control system and urban traffic flow guidance system may perform an important role in alleviating traffic congestion. To achieve this objective, a dynamic traffic coordination control model of traffic congestion based on synergetics is proposed in this paper. After that approach, a simulation scheme based on VISSIM 4.2 is carried to evaluate the reliability of the model. The results proved that the whole system could benefit a lot.
Entire Symmetric Structure Inchworm-Type Piezoelectric Linear Actuator
Authors: Zhang Hong Zhuang , Shi Jiang Tian , Sun De Xin
Published: July 2011

The feature of the hot cracks of the welding joint of the MIG welded magnesium alloy AZ91D was studied systematically. The result indicates that the weld of the magnesium alloy displays a high cracking susceptibility. The cracks are mainly formed on the centerline of the weld and in the arc crater at the end of the weld. These cracks propagate along the α-Mg grain boundary, and they belong to the solidification cracking. These solidification cracks are resulted by the joint function of the low melting point liquid film in the weld and the tensile stress suffered by the weld metal during the solidification process. The low melting point liquid film is the internal cause to form the solidification cracks, while the tensile stress is a necessary condition. Limiting the amount of the low melting point eutectic and decreasing the tensile stress of the welding joint are two effective methods to improve the solidification cracking susceptibility of the Mg alloy weld.
Preparation and Characterization of Chitosan-Casein Phosphopeptides Biocomposite Coatings on the Medical Titanium Alloy
Authors: Liu Bin , Wang Lin , Bu Yin Zhong , Yang Sheng Rong , Wang Jin Qing
Published: July 2011

Titanium (Ti) and its alloys have been applied in orthopedics as one of the most popular biomedical metallic implant materials. In this work, to enhance the bioactivity, the surface of Ti alloy pre-modified by silane coupling agent and glutaraldehyde was covalently grafted with chitosan (CS) via biochemical multistep self-assembled method. Then, for the first time, the achieved surface was further immobilized with casein phosphopeptides (CPP), which are one group of bioactive peptides released from caseins in the digestive tract and can facilitate the calcium adsorption and usage, to form CS-CPP biocomposite coatings. The structure and composition of the fabricated coatings were characterized by X-ray photoelectron spectroscopy (XPS), attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) and atomic force microscopy (AFM). As the experimental results indicated, multi-step assembly was successfully performed, and the CS and CPP were assembled onto the Ti alloy surface orderly. It is anticipated that the Ti alloys modified by CS-CPP biocomposite coatings will find potential applications as implant materials in biomedical fields.
Optimization Design Based on DEFORM-3D Finite Element Analysis about Steel Rolling Production
Authors: Ren Jian Hua , Wang Wei , Liu Rong
Published: July 2011

This paper took the high-speed wire rod rolling process of φ20 bar as the research object, to be simulated numerically under the work platform of the finite element software DEFORM. The simulation results were compared with the actual operation of the production process, the rolling simulation reappeared the actual production situation, realized the visualization of the rolling process. After analysis, the defects of rolling technology were found out. Based on the research, the optimum design was gotten and then simulated which improved the actual production process and avoided the original defects. The optimum design is feasible to practical production and reduce the cost of test in practice The paper just focused on the first one of 12 rolling process as an example to show the simulating process and results.
Analysis and Design of Monitoring System Based on Streaming Media
Authors: Cai Dan Lin , Zhu Da Xin
Published: July 2011

The video Monitoring System is an important part of intelligent building security system. The structure of the video Monitoring system is analyzed ,the system is proposeed and each sub-system software design are presented in this thesis.the system has obtained more satisfactory effect in practicability, reliability and cost.
The Development and Experiment of the MSMA Actuator Test Platform Based on LabVIEW
Authors: Ji Hua Wei , Wen Yong Qing , Fu Chen Ming
Published: July 2011

Data acquisition is very important for control precision of micro-positioning platform. Based on LabVIEW, a kind of MSMA (Magnetically Controlled Shape Memory Alloy) test platform was developed, and the data acquisition, programming and testing was studied. The deformation mechanism of MSMA was analyzed, and the characteristics of MSMA were obtained by experimental study, the relationship curves between displacement and current, and the curves between magnetic field and current were tested. Experiments show that the test platform for intelligent materials is excellent and reliable, and the paper provided a good research platform for the study on properties of intelligent materials.
Analysis of Drop-Fall Damage Failure of Composite Cylinder
Authors: Tie Ying , Li Cheng , Xu Ping
Published: July 2011

Based failure criteria of composite materials structural damage and simulation of finite element dynamic impact, the drop process and damage failure of composite cylinder are calculated and analysed. For composite cylinders with different wind angles falling from a height, the stresses of internal points during the impact process are obtained. Based on the value of the process stress, the failure of the cylinder is analysed. The results show that at the moment when the cylinder bounces back after impacted with the ground, the stress and strain reaches to the maximum. The maximum hoop stresses are at cylinder mouth and cylinder bottom which collide with ground. Maximum axial tensile stresses are at the central body of cylinder. The stress distribution of 13 degrees fiber angle of cylinder is slightly less than that of 25 degree. By Tsai-Wu composite failure criterion, there is no failure of the composite cylinder.
Study on Flow Field in Different Styles of Blades for Eddy Current Retarder’s Rotor Based on CFD
Authors: Shen Jian Ming , Liu Cheng Ye
Published: July 2011

Eddy current retarder was a retarder braking set used in an automobile, and it can transform kinetic energy or mechanical energy of the automobile into heat energy, and heat energy was emitted around environment by the blades founded in the rotor of eddy current retarder, so flow field within the blade had direct effect on heat elimination and braking performance. In this paper two styles of 2D computational model for the rotor had been established. The flow field between and out of blades were analyzed by using RNG Κ-ε model and energy equation. The velocity distribution, pressure distribution between blades, static pressure on work face and rear face of the blade along radial direction all were accepted. The pressure, velocity and air flux for two styles of the blades had been compared. Numerical analysis of flow field was in favor of improved structure design for the blade.
Prediction of T-Shaped Tube Hydroforming Stress Limit
Authors: Zhou Lin , Cheng Xiao Min
Published: July 2011

Tube hydroforming has been widely used in auto industry due to its remarkable advantages compared with conventional manufacturing via stamping and welding. The forming limit stress diagram (FLSD) which is independent of strain paths is of great significance to tube hydroforming. The FLSD of 2008T4 tube blank was established to predict fracture defect in T-shaped tube hydroforming simulation. By numerical simulation method, the stress limit and strain limit were analyzed and fracture defects were predicted. Two prediction results of the fracture defects location were the same yet the limit pressure values corresponding to fracture were different. The FLSD prediction result was close to the experiment result, so the accuracy of FLSD as tube hydroforming limit criterion was proved.
Sensor Deployment for Location-Estimation Coverage
Authors: Ma J. , Komuro Nobuyoshi , Sakata Shiro
Published: July 2011

Sensor deployment problem for target location estimation is important for sensor networks which fulfill the monitoring tasks. In this paper, we investigate the deployment schemes which guarantee the location estimation accuracy of an arbitrary point within the region, by connecting the location estimation problem with the perspective of k-coverage problem. Our strategies are deploying sensors to guarantee the location-estimation accuracy of an arbitrary point within the monitored region, and to minimize the number of required sensors. Compared with the random deployment, the deterministic deployment provides a better solution to guarantee the location-estimation accuracy over the monitored region. Regular space deployment patterns in 2-dimension, i.e. equilateral triangle, square and regular hexagon, are discussed. The relationship between deployment density and vacancy ratio are derived by mathematical analysis. The derived required sensors deployment density to an arbitrary vacancy ratio for location-estimation coverage provides useful guidelines for sensor network deployment when location-estimation system is required for any practical application.
Feedback Control of a Flexible Micro-Displacement Manipulator
Authors: Ji Hua Wei , Wen Yong Qing , Fu Chen Ming
Published: July 2011

Micro-displacement manipulator consists of piezoelectric actuator and flexure hinge is being widely used in precision positioning technology for its high resolution of displacement, high stiffness and fast frequency response. However, the hysteresis nonlinearity of actuator and vibration limited its control accuracy. In order to improve the positioning precision, the relationship between input voltage and output displacement was studied, the hysteresis nonlinearity was described by mathematical method, and a closed-loop controller was proposed to control the hysteresis and vibration. Experiment results revealed the proposed closed-loop controller can enhance the control precision of micro-displacement manipulator.
Tensile Behavior of Foamed Aluminum with Closed-Cell
Authors: Wang Fang , Wang Lu Cai , Wu Jian Guo
Published: July 2011

Foamed aluminum has been applied in many fields due mainly to its excellent properties. The tensile deformation process and characteristics of foamed aluminum with closed-cell were studied in this paper and the deformation mechanisms were discussed. The results show that foamed aluminum fractured without necking. The tensile stress-strain curves have similar characteristics, the linear elasticity at a low stresses followed by plastic yielding, strain hardening and rupture, which has obvious difference with compression stress-strain curve. The fracture mechanism is neither brittle fracture nor plastic fracture. The defects existed in foamed aluminum interior have important influence on tensile property.
Reconfiguration of Shipboard Power System Using Improved Ant Colony Optimization
Authors: Wang Zheng , Wang Yong Ji , Li Zhe
Published: July 2011

An improved ant colony optimization is presented for solving subset problem by using k-nearest neighbor, which is used to reconfigure shipboard power system. Reconfiguration is considered as a typical subset problem, a mathematic model is built to solve it. K-nearest neighbor method is used to decrease the space of solutions and improve efficiency. The result of simulation shows that the improved algorithm can reconfigure shipboard power system efficiently.
Research on Project Cost Management Model of Ecological Construction
Authors: Liu Feng , Wang Jun Min
Published: July 2011

In recent years, in order to reduce building energy consumption in China, and vigorously promote the development of ecological construction, the paper studies disadvantages of the cost of traditional project management applications in the ecological construction projects, exploring specific cost management adapt to the ecological construction project.
A Constructive Genetic Algorithm for the P- Median Location Problem of Typhoon Emergency Shelter in China Coastal Rural Areas
Authors: Pan An Ping
Published: July 2011

Evacuation is a process in which threatened people are displaced from dangerous places to safer places in order to reduce the health and life vulnerability of affected people. Constructing typhoon emergency shelters is one of the ways to improve the areas anti-disaster capacity. There are many questions in emigration resettlement work. Such as: the layout of the resettlement places unreasonable, the fixed resettlement is insufficient, temporary resettlement site lacks the necessary living facilities and so on. Planning and construction of emergency shelters is a systematic project, which needs scientific and rational design. This paper proposed a mathematical model applied to the location selection, a solution of genetic algorithm was suggested. Then bring forward a decision-making model for the location-choosing of urgency response system and carried out the design procedure of genetic algorithm to finalize the optimized combination plan.
Research on the Application of Green Technology to Leather Shoes in their Life Cycle
Authors: Peng Wen Li , Qin Zhong Bao , Zhang Wen Ni , Tan Juan Juan
Published: July 2011

The concept and contents of green leather shoes are analyzed in this paper. It is introduced mainly how to practice green technology in the life cycle of leather shoes to achieve green manufacturing, including green design, green production, green packaging, green use and green recycling and disposal. Green technology theory of shoes is continuously developing. It needs enterprises, research institutes and government departments to work together for green design and manufacturing of leather shoes to achieve a breakthrough in the theory and practice and promote shoes manufacturing go on the green road as soon as possible.
The Influence Factor Analysis for Coupling Performance of HSK Tool System
Authors: Zhou Chun Jiang
Published: July 2011

The coupling performance of tool system is the important factor for the machining quality of high speed machining. Based on the deformation of contact surfaces of HSK tool system, the paper makes the academic analysis by elasticity theory and finite element simulation to high speed spindle/tool shank coupling system. The property of the contact stress and the radial deformation as well as the torsional stiffness with different amount of interference has been analyzed. In this method, the paper brings forward how the amount of interference will affect the coupling performance. Thus, it will give academic evidence to design and select tool system in the process of high speed machining.
Design and Analysis of the Base of the Precision Motion Platform
Authors: Lin Hai Bo , Hu Zhe Guang , Yang Guo Zhe
Published: July 2011

In ultra-precision cutting, grinding and special processing, it is difficult to resolve the conflict between the large stroke and high-precision feed, which is also a headache for multi-axis ultra-precision machining. In order to construct a low-speed micro-electron discharge machining system adaptable to a wide range of micro-methods and driven by ultrasonic motors (USM), the program attempts to design the base platform for precision Motion Platform. By analyzing the dynamic and the static properties for the platform with ANSYS software and comparing the designs of platforms, the design of the base motion platform has been completed. After testing the performance of the platform, the design has met the requirements. The research can be treated as a universal solution in the design of the base platform for high-precise motion areas.
Study of Diesel Fuel Heating by Intelligent Materials under Transient High Pressure
Authors: Li Xiao Lu , Gu Le Feng , Xu Cang Su , Wang Jun
Published: July 2011

This paper gives a way which utilizes the intelligent heating materials to preheat diesel fuel in the high-pressure tube in order to improve the cold starting and emissions of engine. A heating model of high-pressure tube was brought forward, and the pressure of tube was measured at a Diesel engine as the computational boundary condition. The unsteady heat transfer was simulated using the computational fluid dynamics by the temperature field and heating effect. Simulation results show that the diesel fuel temperature could improve by the right heating size and temperature in the high-pressure tube.
Challenges in a Long-Distance Pipe Jacking and Solutions in China
Authors: Hui Liu
Published: July 2011

Pipe jacking, for its incomparable technical superiority, has been gaining wider and wider application in municipal construction project. However, there are many difficulties in terms of construction techniques and the long-distance pipe jacking is one of the most complicated. This paper, with the case history of the first and second stage of the sewage disposal project in Chongqing, presented the comparison and selection for the optimal construction scheme of long-distance pipe jacking, the installation techniques of pipe-jacking equipments, pipe-jacking construction method, technical challenges and possible solutions. The result of the study shows that long-distance pipe jacking technique, if carefully designed and combined with information construction, can be widely applied to the construction of municipal infrastructure in China.
Construction Technology of Shallow Pipe- Jacking Working Shaft
Authors: Hui Liu
Published: July 2011

During the pipe jacking construction, the bearing plates of jack need the support of great reactive force which is provided by the side-wall of the working shaft and the soil mass behind the wall. In the shallow pipe-jacking working shaft, the soil mass only can provide limited reactive force due to the small height of the soil mass behind the side-wall, which becomes the difficult point in the design and construction of the shallow pipe-jacking working shaft. This thesis takes the actual projects for the examples to introduce the construction technology of shallow pipe-jacking working shaft in details, including the construction key points like pre-grouting injection consolidation, ring beam construction method as well as reverse construction method.
Key-Points of Construction Techniques for Concrete Pipe-Jacking Tunnel
Authors: Yang Zhuan Yun
Published: July 2011

As a trenchless technology for buried pipeline, pipe-jacking tunnel technology is increasingly displaying the enormous superior in buried pipeline remodeling in city. Combining characteristics of pipe-jacking tunnel, this paper analyzed key-points of construction technology and engineering troubles which occurrence possibly in construction, and introduced some treatment measures. This paper is also sum-up of pipe-jacking construction many years, maybe provide some help for the same kind of construction.
Construction Technique of Inspection Well for Water Drainage Pipe Jacking Project with Sunk Tube Method
Authors: Yang Zhuan Yun
Published: July 2011

Inspection well is needed for water drainage pipe jacking project in municipal engineering construction, and the deep ones are usually built by sunk tube method. According to a real project, this paper dissertates the construction technique of deep buried inspection well with sunk tube method under the condition of abundant water existence form the aspect of design theory and construction technique and emphasizes the problems and countermeasures during tube sinkage. The practice shows that inspection well with sunk tube method could resolve the difficulty of construction in Water-soaked Stratum.
Decorative Arts on Manor House Wood Doors and Windows of Changjia
Authors: Yan Hui
Published: July 2011

In this paper, wooden doors and windows often decorated manor house as the research object, by analyzing the types, forms, and other decorative techniques, revealing the traditional architectural Shanxi reflected the deep cultural connotation, and the wood used in building, it is the practical and a combination of aesthetics, but also building the spirit of the carrier. Shanxi often manor house is a typical style of a northern Shanxi Merchants in Ming and Qing buildings. After nearly a century of uncompromising attention to quality as a building lasts. Shanxi pay attention to "roots", fortune after the regular family invested huge capital to build their own homes, therefore, often family has strong strength to his own aesthetic ideal, cultural awareness, spiritual pursuit, and local folk customs and so concentrated on their own construction and architectural decoration. Through the construction and decoration can be seen often at home that year strong economic strength, and their aesthetic, the pursuit of morality and local customs, should be studied in depth. Residential buildings have doors and windows. Door for people to access the main building; windows, mainly used for indoor ventilation and lighting. Ming and Qing Dynasties, construction of columns, beams, brackets and roof shape and other large areas of wood has a strict limit, the owner's wealth, only by aesthetics, etc. for doors, windows and other small wood decorations to reflect. With strong economic strength in the construction of a permanent home when the estate into a huge financial, human and material resources, producing countless exquisite wood carving decoration.
Adosorption of H2O on the Inside Surface of B-N Co-Doped Carbon Nanotube
Authors: Wei Jian Wei , Zeng Hui , Pu Li Chun , Hu Nan
Published: July 2011

In this paper, we have investigated the geometries and electronic structures of B-N co-doped carbon nanotube with inside adsorption of water molecules. The charge distributions, band structures and local density of states are calculated by using the first-principles theory in detail. The results show that the water molecules can adsorb stably on the inside surface of the doped nanotube with slight deformation. The π and π* subbands shift upward depending on the sites of the adoptions. The investigations will be beneficial to the biological application of B-N co-doped nanotube.
Effect of La2O3 on the Electrical Properties of WO3-Based Varistor Ceramics
Authors: Wang Tian Guo , Qin Qun , Zhang Wen Jun
Published: July 2011

The nonlinear electrical behavior and dielectric properties of WO3-based ceramics with various La2O3 contents have been investigated. Breakdown voltages Eb of WO3 doped with La2O3 are lower than that of undoped WO3, indicating that the dopant can reduce the breakdown voltage. The dielectric constant of doped samples is higher than that of undoped samples, and the high dielectric constant makes them suitable as capacitor-varistor materials. The theory defects in the crystal lattice was introduced to explain the nonlinear electricial behavior of the La2O3-doped WO3 ceramics. In view of these electrical characteristics, the WO3 ceramic doped with La2O3 is a viable candidate for capacitor-varistor functional devices.
The Model of Liu Chaotic Synchronization with Oscillating Parameters under the Impulsive Control
Authors: Chen Yan Hui
Published: July 2011

The control of chaotic synchronization is the kernel technology in chaos-based secure communication. Those control methods have to transmitting control signal which increase the security risks of the communication system. Attacker can reconstruct the chaotic system or estimate parameters by using the information of the chaotic system. In this paper we propose a hybrid Liu chaotic synchronization control scheme which contains both continuous chaotic system with oscillating parameters approach to 0 and discrete chaotic system. By theory of impulsive differential equations, we proved a theorem that two continuous Liu chaotic systems can get synchronized without control signal transmitting which has reduced the risk of the security.
Complex Network Synchronizability: The Effect of Coupling Strength
Authors: Liu Xin Jin , Zou Yun , Liu Jian Li
Published: July 2011

In this paper, the effect of the coupling strength to the complex network synchronizability is investigated. For a given network with identical node dynamics, it is shown that the coupling strength among the nodes is one of key factors influencing the network synchronizability besides the network inner linking matrix and the eigenvalues of the network topological matrix. It is point that if the synchronized region is an unbounded sector, for achieving synchronizability, the coupling strength must be greater than or equal to the minimum coupling strength, and with the increasing of the coupling strength, network synchronizability is improved; if is a bounded sector, for achieving network synchronizability, the coupling strength must be in a certain range, and the larger coupling strength does not necessarily indicate better synchronizability.