bluuebunny/crossref_metadata_2025 huggingface dataset:
Effect of Flow Field on Cutting Fluid Penetration during Minimum Quantity Lubrication (MQL) Machining
Authors: Zheng W.J. , Pei Hong Jie , Wang Gui Cheng , Shen C.G.
Published: March 2011

In order to study the mechanism of cutting fluid penetration during minimum quantity lubrication (MQL) machining, the flow field in cutting area was investigated through both theoretical analysis and computational fluid dynamics (CFD) simulation on the basis of cutting experiments. Combining the capillary model of cutting fluid penetration, the flow field in the wedge-shaped area beside major flank of the tool was analyzed in detail. It was found that the flow pressure at the wedge angle was lower than the outer. It was favorable for cutting fluid to penetrate into the main cutting edge. Besides, the air supply pressure of MQL has great impact on cutting fluid droplet track. Proper air supply pressure was in favor of cutting fluid penetration.
Process Information Parameterization of Camshaft Part for Virtual High-Speed Grinding
Authors: Cao De Fang , Deng Zhao Hui , Wan Lin Lin , Zhang X.H.
Published: March 2011

Virtual camshaft part is a very important information carrier for camshaft virtual high-speed grinding. The veracity and maturity of process correlation information, which holding on the virtual camshaft part, will directly determine the virtual high-speed grinding results’ authenticity and practicability. By analyzing geometrical structure and all kinds of process correlation attribute information, a method of process information parameterization of camshaft part for virtual high-speed grinding was presented in this paper, and a practicable function module of camshaft virtual part parameterization define was developed according with this mind.
3D Simulation and Analysis for Face Precision Milling of Aerospace Aluminum Alloy
Authors: Lin Ai Qin , Zheng Min Li , Gu Yan
Published: March 2011

The present work aims at simulating three-dimensional milling operation of aluminum allo7451.Building a nose ring radius and edge radius tool model. Using finite element analysis software , conducted a three-dimensional simulation of milling process. Milling force, milling temperature, stress distribution and chip shape of milling process have been got. A milling force experiment was carried out under the same cutting conditions as the simulation, and a good agreement between the simulation result and the experimental result was achieved, and chip shape matched the practice well. The simulation shows that the three-dimensional finite element milling cutter model and the workpiece model can be used to correctly simulate precision milling process, optimizing the cutting parameters by analyzing variation of the cutting force, the temperature and equivalent stress.
Research on Comprehensive Quality Evaluation System for Computer Supported Cooperative Design of Mould
Authors: Wang Yong Zhong , Zheng Min Li , Man Z.Q. , Li W.
Published: March 2011

This paper develops a mould computer supported cooperative design platform based on internet. Methods to evaluate the cooperative design quality of enterprises that take part in cooperative design are researched. A mould computer supported cooperative design evaluation architecture is built and an evaluation model based on fuzzy evaluation is established, based on which, a comprehensive quality evaluation system for computer supported cooperative design of mould is developed.
Determining Structural Modes of HSK Tool System and Influential Factors
Authors: Shen Chun Gen , Wang Gui Cheng , Wang S.L. , Nie W.W. , Liu G.
Published: March 2011

The mode analysis of the HSK tool system structure is the base for determining HSK high speed spindle-tool system dynamic performances. In this paper, considering the HSK63A tool system as the research object, by way of the dynamic finite elements analysis method (FEM), the finite element assembly model of HSKA63 tool system was established, the natural frequencies and the modal shapes were obtained under the free condition. Then, with the method of experimental modality analysis (EMA), the FEM results were determined whether the construction of the finite element modal was reasonable or not, the factors were discussed, such as tool diameters, tool length, connection conditions of shank and cutter etc, which affected the mode parameters of HSK tool system structure. The computing results can be offered for evaluating the tool system’s dynamic performances as the theoretic evidences.
Process Simulation and Process Parameter Optimization of Large Automobile Cover Die Hard Milling
Authors: Guo Kai , Liu Xian Li , Yue Cai Xu , Huang J.C. , Li W.T.
Published: March 2011

. Large automobile cover die with complex characteristics and high hardness after quenching is mainly applied hard milling. In processing, large tool vibration, short cutting-life and much time-consuming increase the die manufacturing cost. In this paper, the relationships of cutting speed with achining efficiency and thickness with tool life are considered in the optimization method. The optimization method based on VERICUT uses the relationships to improve machining efficiency and tool life, thus reduce the large automobile cover die processing costs. The simulation and the optimization laid the foundation for the follow-up physical simulation and experiment.
Military Vehicle Start-Up Process Simulation and Analysis Based on Matlab
Authors: Zhou Y.B. , Wei W.
Published: March 2011

Based on object-oriented modeling technique, Vehicle dynamic model is divided into several separate sub-modules through physical modeling software Matlab/SimDriveline. The main components effect vehicle dynamics are simulated and analyzed. Whole vehicle dynamics model is established and its start-up process is simulated and compared with test results. It shows that simulation results agree with test results.
Crack Growth Direction Analysis Based on Elastic-Plastic Property of Material
Authors: Yin Zhi Ping , Zhang Jiong , Guo Jin , Huang Qi Qing
Published: March 2011

The finite element software ANSYS was employed to create a finite element model of the cracked wing beam integrated structure, and the stress field of the crack tip was got by the material nonlinearity (elastic-plastic) analysis method. Based on the maximum tensile stress theory criteria, the crack deflection angle was obtained. The crack deflection angles with different geometry parameters (crack length, wed thickness, the height-thickness ratio of the stringer, cross-sectional area, and the location of the stringer) of the wing beam integrated structure were calculated and compared with each other. So the influences of the geometry parameters of the wing beam integrated structure on the crack deflection were studied. The crack deflection angles obtained in elastic analyzing and elastic-plastic analyzing were compared to investigate the effects of the material property on the crack deflection angle.
Design on the Testing System of the Towing Tank
Authors: Li Guang Nian , Guo Xin
Published: March 2011

Considering the requirement of testing on ship powering performance, and the actual situation of the towing tank, a system, which contains the testing module of resistance performance, propeller on open water, self-propulsion and calibration, was designed. And a system software used for measuring ,controlling and analyzing date was written as well. Every modules’ main functions, test requirements and the realization forms were also put forward in this paper. Considering it not only meets the need of the model test mentioned already, but also fits the function expanding in the future, this system was designed to be modularized and scalable. I hope that it could give technical support to the researchers in ship performance and ship construction enterprises.
Prediction of Oilfield Cementing Quality Based on Levenberg-Marquardt BP Algorithm
Authors: Wang Yu Xue , Zhou Shao Hua
Published: March 2011

In this paper an improved algorithm of BP neural network --- Levenberg-Marquardt (LM) algorithm is introduced, and the simulation predictions of oilfield cementing quality is done by using this method. Finally, a practical example verified the feasibility of the presented method.
Suspended Load Prediction on Sucker Rod Suspension Load Based on Artificial Neural Network
Authors: Zhou Rui Fen , Bai Lin , Dong Kang Xing , Dai Yu Xin
Published: March 2011

Using the test data of suspendsion load on socker rod from oilfield database, a prediction model is presented, which adapted the improved L-M neural network algorithm and explored the 6 effect factors’ relationship: the rod stroke, frequency of strokes, rod diameter, pump diameter, submergence depth and pump setting depth. With training the model,and higher training accuracy is acquired, which shows using this method to predict the suspendsion load is effective.
Localization and Path Planning of Intelligent Wheelchair Based on Data Fusion
Authors: Luo Yuan , Shao Shuai , Zhang Yi
Published: March 2011

Focuses on the range error of sonar due to specular reflection, a method of weighted fusion has been used to fuse the data of sonar and camera and make the intelligent wheelchair complete the localization accurately at the area of corner. A path planning for the wheelchair is then given. After testing experiments, results show that the method can make the wheelchair passing through a corner safely and smoothly.
A New Optimization Algorithm for Identification of Material Parameter
Authors: Lv Ying Hui , Feng Xia Ting , Liu Jun Yan
Published: March 2011

It has gained some popularity that optimization methods are used for identification of material parameters, furthermore because of non-linear relationship between identified parameters and foregone information, mostly parameter identification problem must be expressed in terms of a global optimization problem. In order to solve successfully non-linear parameter identification problem, a new global optimization algorithm, which is based on the general dynamic canonical descent method, is proposed. The results in numerical experiments and engineering application both show that the proposed method will be robust one in the field of non-linear parameter identification.
Preparation and Characterization of FeS Film by Low Temperature Ion Sulfurizing Technique
Authors: Kang Jia Jie , Wang Cheng Biao , Wang Hai Dou , Xu Bin Shi , Liu Jia Jun , Li Guo Lu
Published: March 2011

In this article, solid lubrication FeS film was prepared on the surface of AISI 1045 steel by means of low temperature ion sulfurizing process. Scanning electron microscopy (SEM) was utilized to observe the surface and cross-section morphologies of the sulfurized layer. The element distribution of the sulfurized layer surface was analyzed by X-ray energy spectrometer. The crystalline phases were determined by X-ray diffraction (XRD). X-ray stress determinator was utilized to measure the residual stress in the sulfurized layer. The nano-hardness and elastic modulus of the sulfurized layer were surveyed by a nano-indentation tester. The results showed that the surface of the FeS film was composed of many minute spherical particles with homogeneous grain size and distribution. The texture of the film was very loose with lots of micro-pores, and the crystallinity was well. There was compressive stress in the FeS film, and the stress value measured is -150 MPa. The average value of nano-hardness and elastic modulus were 4.02 GPa and 157.36 GPa respectively.
Effects of Homogenization on Microstructures and Mechanical Properties of as Cast AZ91 Mg Alloy
Authors: Liu Jun Wei , Lu Shi Qiang , Dong Xian Juan , Xiao Xuan
Published: March 2011

The microstructural evolution and mechanical properties of as cast AZ91 Mg alloy enduring different homogenization conditions were researched. The results show that the peak stress and plasticity obtain improvement with the increase of heat treated time and temperature until 693K. When the temperature is higher than 743K, the sample will occur the over-burned and directly lead to the decrease of mechanical properties. Otherwise, with the increase of heat treated time and temperatures, the second phase gradually precipitate from the solution, while the grain evolution is not obvious. In the compression process for the samples after heat treatment, some twins could be found in the grains.
Mechanical Properties of PVC/ABS Composite Material
Authors: Qiao Wei Wei , Wang Hui , Zhao Yan Hua , Han Yi Xia
Published: March 2011

We investigate the mechanical properties of Poly Vinyl Chloride (PVC)/ acrylnitrile-butadiene-styrene copolymer (ABS) composite material with an impact testing machine，a material testing machine and other accessory devices. The result shows that the mechanical properties of PVC/ABS composite are a function of composition, the addition of ABS improved the mechanical properties of PVC/ ABS composite，the impact strength and elongation at break rise significantly with increasing ABS content in PVC/ABS composite and appears maximum value，While the tensile strength and modulus almost decrease monotonously with increasing ABS content in PVC/ABS composite.
Damping Properties of Viscoelastic Stiffened Laminated Cylindrical Shells with an Unconstrained Fiber-Reinforced Layer
Authors: Yang Shao Hong , Wang An Wen , Wu Jing , Huang Fang
Published: March 2011

By use of the mixed layerwise theories and the interpolation functions of displacements and transverse stress, the dynamics equations of viscoelastic stiffened laminated cylindrical shells with an unconstrained fiber-reinforced layer were derived. The predicted vibration frequency and loss factor show the good agreement with the A.Okazaki’ experimental results for the two-layer cylindrical shells. The non-dimensional frequencies and loss factors were computed for different Young’s modulus and thickness of viscoelastic layer. The results show that using a higher module and thickness viscoelastic layer can effectively increase the loss factors; moreover, using a circular-reinforced viscoelastic layer has little effect on the non-dimensional frequencies, but can effectively increase the model loss factors.
The Higher Order Asymptotic Fields for Anti-Plane Oblique Crack with Physical Weak-Discontinuity
Authors: Dai Yao , Li Shi Min , Zhang Peng , Chong Xiao
Published: March 2011

An arbitrarily oriented anti-plane crack with its tip at the physical weak-discontinuous line of the structure which is made up of homogeneous material and functionally graded materials (FGMs) is studied. The analytic solution of the higher order crack tip fields (similar to the Williams’ solution of homogenous material) is obtained by applying the asymptotic series expansion. When non-homogeneous material parameters are degenerated, the solutions become the same as the asymptotic crack tip fields of the homogeneous material. Therefore, the solutions are the basic results of non-homogeneous fracture mechanics, and provide a theoretical basis for solving the fracture problems of one common structure with physical weak-discontinuity.
Fracture Behavior and Crack Growth Rate of Al-Li Alloy Friction Stir Welded Joints
Authors: Ma Yu E
Published: March 2011

Third generation Al-Li alloy 2195 and 2198 were studied. The material properties of these two Al-Li alloy were compared with traditional alloy 2024; damage tolerance properties was tested and compared with 2024 as well. Microstructure of parent material and welded sample was studied and compared. Crack growth rate was tested and compared. Some conclusions were drawn: Al-Li alloy had a great strength and damage tolerance; local inhomogeneities microstructure in welded samples, which created the difference of damage tolerance and the tendency of crack growth rate in welded samples.
Research on Information Security Evaluation of Internet of Things Electronic Commerce Based on AHP
Authors: Huang Man Ying
Published: March 2011

Internet of Things (IOT) is an extension and expansion of the internet development. The ultimate goal of IOT system is to realize the exchange and communication between human and thing as well as thing to thing. With the constant development of IOT, the intellectual degree of the future IOT would be higher and higher, the application filed would be getting extensive too. IOT plays a very important promoting effect on the logistic service system, corporation production and operation management, the production quality control of the online shopping by consumers and other aspects of the electronic commerce. IOT E-commerce provides extreme convenience to people’s work and life, but its information safety still has some restriction. The character of Analytic Hierarchy Process (AHP) is to divide the complicated problem into simple combinations of multiple hierarchies and factors, and group each factor in two for comparison and calculation, according to the calculated result to make judgment and make choice. This article, based on AHP model, establishes information security evaluation model of IOT electronic commerce, evaluates on the five physical measures to protect electronic label by theory analysis on algorithm and AHP model, which has certain referential value to the IOT E-commerce information security evaluation work.
Seismic Reaction Analysis on High-Rise Isolated Structure with Multi-Tower
Authors: Zhao Nan , Ma Kai , Tang Shao Xue , Chen Bin Lei , Li Ting
Published: March 2011

Structural reaction analysis under frequent earthquake and rare earthquake was carried out using time- history method. Every single-tower structure was chosen as an analysis modal, which can reflect real structural reaction. The results show that seismic response decreases obviously and story shear force and overturning moment are far less than that of aseismic structures. Horizontal reduction coefficient is lower under rare earthquake. Story drift is mainly centralized at isolator layer, which approaches zero on superstructure. The isolated structure shows whole translational motion. Reduction degree of seismic response for the three towers is more or less from each other.
Subwavelength Plasmon Microcavity Based on the Indefinite Metamaterial Waveguide
Authors: Zhang Li Wei , Lou Yuan Cheng , Zhao Yu Huan , Wang Qin , Qiao Wen Tao , Li Li Xin
Published: March 2011

The resonance properties of surface plasmon in the IMM/dielectric/IMM waveguide are theoretically studied by using finite-difference time-domain technique, where the claddings are indefinite metamaterials (IMMs). From the dispersion relation, it is found that the IMM/dielectric/IMM waveguide supports TE polarized surface plasmon if IMM is always-cutoff with negative permeability. For an IMM/dielectric/IMM waveguide with a finite length, a subwavelength plasmon microcavity can be formed by Fabry-Perot resonance. At the resonant frequency, the magnetic field is maximized at the dielectric core entrance and exit, the electromagnetic energy is strongly concentrated around the dielectric core. When an artificial magnetic resonator is put at the core entrance and the resonance frequency is tuned to the plasmon microcavity mode, Rabi splitting can appear because of the strong coupling between this resonator and the cavity mode.
Chinese Date Grading Based on Machine Vision
Authors: Wang Fu Juan , Zhang Yuan Min
Published: March 2011

. In order to implement the accuracy and robust classification of Chinese dates according to size and shape based on machine vision techniques on line, the method of classification according to size and shape for Chinese dates was studied. The Chinese date is segmented from the background in RGB color space by analyzing respectively the histogram of R, G and B channel to make comparing among them and find an optimal one, resulting in good contrast between Chinese date and background in G channel. Three different profile image of a Chinese date were gained to calculate the diameter of the Chinese date and the maximum diameter value was used to be the character value for size classification. The ratio of maximum radius and the minimum radius was used to be the character value for shape classification. Experiment results proved the methods is effective to classify Chinese date by size and shape.
The Observation of Changes in the Magnetic Field due to the Crack Initiation under Different Stress Ratio Conditions
Authors: Honda Takashi , Kida Katsuyuki , Santos Edson Costa , Rozwadowska Justyna , Uryu M.
Published: March 2011

Fatigue failure of steel occurs when cracks form in a component and continue to grow to a size large enough to cause fracture. In order to understand the strength of a steel component, it is important to locate these cracks. We developed a scanning Hall probe microscope (SHPM) equipped with GaAs films sensors and observed fatigue cracks at room temperature in air while they were growing. In our previous works, we determined the correlation between crack growth and magnetic field in high carbon tool steels (JIS SKS93 and JIS SUJ2). We also reported the sensitivity of the SHPM equipped with a three-dimensional line-probe that was developed to decrease the sensor gaps. By using the line-probe sensor we succeeded to measure the magnetic flux density distributions in very close proximity to the specimen’s surface. However, in order to further understand the relation between magnetic flux density and crack growth, other materials, microstructures and fatigue test conditions should be evaluated. In the present work, we focus on the effect of stress ratios on the changes of the magnetic flux density in annealed carbon tool steel.
Effects of Moduli Differences on Layout Optimization of a Continuum with Multiple Materials
Authors: Jiao Shi , Wang Zheng Zhong , Cai Kun
Published: March 2011

For a continuum structure filled with many solid phases with different stiffness, the layout of the materials should be optimized to perform an excellent structural mechanical behaviour. The differences between the materials’ moduli affect the final layout of materials in structure. To investigate the effects, a numerical approach is adopted to find the optimal topology of a continuum with multiple materials. In the method, the layout of the material is determined by the local strain energy density (SED). Briefly, in design domain, a material point with higher SED should have higher modulus. To show the effects obviously, a continuum with three phases is used for experiment. In the structure, the modulus of the stiffest material and the volumes of materials are fixed. The other materials’ moduli change alternately. Numerical results demonstrate the layout of materials in structure depends on the differences between the moduli greatly, and the topology of the stiffest material is clear if its modulus is far more than the others.
Calculation of the Stress Intensity Factors for Elliptical Cracks Embedded in a Weld under Tensile Loading I：Single Crack
Authors: Liu Xiao Yu , Qian Cai Fu , Li Hui Fang , Zheng Hui
Published: March 2011

In this paper, an embedded elliptical crack in a weld of pressure vessels under tension was taken into consideration, and stress intensity factors at the crack tip were calculated numerically with the emphasis on the influences of the weld surface. It is found that when the embedded depth is 4 times larger than the minor semi-axis of the ellipse, the weld surface effects on the crack can be neglected and the numerical solutions for the stress intensity factors well agree with the analytical ones. This result can be used to distinguish a shallow embedded crack from a deep embedded crack. It is also found that the point with maximum stress intensity factor is always located at the end of minor axis of the ellipse no mater the shape of the ellipse is and how deep it was embedded.
Associated Interpretation of Sub-Bottom and Single-Channel Seismic Profiles from Shenhu Area in the North Slope of South China Sea - Characteristic of Gas Hydrate Sediment
Authors: Li Shou Jun , Chu Feng You , Fang Yin Xia , Wu Zi Yin
Published: March 2011

Abstract：The study area of this paper is the slope of Shenhu Area in the northern South China Sea. We interpreted both sub-bottom and single-channel seismic profiles to describe the acoustic characteristic of gas hydrate sediment and to discuss the cause of its formation. We distinguished some abnormal physiognomy and geologic objects that are relative to gas hydrate in profiles. Protuberance, shallow fault, acoustic blank patch, partial enhanced reflection and acoustic blank zone were discovered in the legible sub-bottom profile. The shallow gassy belt locates under the seabed from 34 to 82 m. Contrasting the sub-bottom profile with the data of Chinese first gas hydrate expedition, we believed that the gas in the shallow gassy belt came from the decompounding of gas hydrate in deep stratum. Pockmark, seepage, fold and Bottom Simulating Reflector (BSR) were recognized in the single-channel seismic profile. The depth of BSR is slightly deeper than that of the samples of Chinese first gas hydrate expedition in the study area. We think the BSR in the seismic profile may be the bottom of gas hydrate. Based on the time-depth conversion, we plotted out Oligocene, early Miocene, middle Miocene and Pliocene in the seismic profile according to the sedimentary thickness, sedimentary rate and age of ODP site 1148 and set up the chronology of the gas hydrate sediment.
Thermokinetic Propertices of CTAB on Quartz Surface and its Effects on Surface
Authors: Liu Wei Dong , Sun Ling Hui
Published: March 2011

In this study, the adsorption mechanism of cethyltrimethylammounium bromide (CTAB) onto quartz surface from aqueous solution was investigated and also some thermokinetic parameters such as isosteric adsorption enthalpy and entropy for this system were determined through thermogenesis curves determination by microcalorimetry. In addition, the contribution of adsorption to the surface wettability is illustrated according to the experimental results of surface electrical behavior and wetting behavior. This study shows that the wetting behavior of CTAB on quartz surface is determined by the process of its adsorption.
Simultaneous Determination of p-Nitrochlorobenzene and o-Nitrophenol in Mixture by Single-Sweep Oscillopolarography Based on Cascade Neural Network
Authors: Duan Shuo , Xu Shuai , Xu Xiao Meng , Zhang Xin , Zhou Chang Li
Published: March 2011

By combining the improved wavelet neural network and BP neural network, a new structure based on mixed cascade neural network was established. The novel cascade neural network has been used to the oscillopolargriphic signals analysis. By the figure fitting and parameters extracting, we realized the prediction of the simulation samples.The training speed and the predication accuracy can be enhanced by optimizing the network structure and parameters. The result of concentration prediction is satisfied . The method has been applied to the simultaneous determination of p- Nitrochlorobenzene (p-NCB) and o-Nitrophenol (o-NP) in simulation samples with satisfactory results. The Relative error and Recovery of p-NCB、o-NP were 3.76%、96.2%； 4.05%、96.0%, respectively. This novel cascade neural network combines the advantage of wavelet neural networks and BP neural networks, and performs its own functions respectively. It has shown a unique advantage in the overlap peak analyze.
Effect of Electromagnetic Field on the Solidification Structure of Copper-Iron Alloys
Authors: Li Bao Mian , Zhang Hai Tao , Cui Jian Zhong
Published: March 2011

The effect of electromagnetic field and iron content on the solidification structure of copper-iron alloys had been investigated in this paper. The results show that the addition of iron to copper causes considerable grain refinement, and the refinement increases with the iron content. Applying electromagnetic field during the solidification of Cu-Fe alloys can further refine grain of hepoperitectic alloys, but has no obvious effect on the grain size of heperperitectic alloys. Primary γ-Fe dendrites are gradually broken and scattered uniformly throughout the matrix under the influence of electromagnetic field. When the current intensity is 200A, the primary γ-Fe appears as fine petal shape distributed uniformly over the matrix.
Thermal-Structure Coupling Numerical Simulation of a Special-Type Plug Nozzle
Authors: Zhang Bo Yi , Liu Wei Qiang
Published: March 2011

Two-dimensional transient heat transfer model of the plug of regenerative cooling plug nozzle is built. Based on the convective heat-transfer coefficient and the radiation heat flux obtained using analytic method and axisymmetric unstructured Delaunay grid applied to mesh the simplified physical model, numerical simulations of transient temperature field and thermal distortion are carried out by finite element method combined with thermal-structure coupling theory. Not only the results of numerical calculation under working conditions with and without regenerative cooling, but the results under low and high working conditions are compared. The results shows that thermal distortion can be reduced effectively when regenerative cooling method is adopted in the throat and combustion chamber that have the most serious thermal condition.
Prepared and Microwave-Absorption Properties of SiC Coated Ni Nanocapsules
Authors: Shi Gui Mei , Zhang Jin Bing , Lian Shu , Chen Long Shan
Published: March 2011

SiC coated Ni nanocapsules were prepared by arc evaporating the mixture of Ni and SiC powders in Ar and H2 atmosphere. HRTEM shows the as-prepared nanoparticles form in a core¬¬¬-shell structure, with the size of nanoparticles in range of 20-50nm and the thickness of the shell 2-6nm. X-Ray and X-ray photoelectron spectroscopy show core consist of Ni, while the shell consists of SiC. The core-shell structure can prevent Ni nanoparticles from oxidation and agglomeration. The electromagnetic characters were measured by Agilent 8722ES microwave network analyzer in the band of 2-18GHz. The reflection loss R(dB) of less than –20 dB was obtained in the frequency range of 3.8-11.1GHz with absorber thickness of 2.5–5mm, An optimal reflection loss of –33.4dB was reached at 7.4GHz with an absorber thickness of 3.5mm.In addition, the optimal RL obviously shifts to the lower-frequency range with increasing thickness of the layer.
DYNA Numerical Experiment on Long-Term Stability of Strip Pillar in Deep Mine
Authors: Wang Chun Qiu , Gu Shi Bin , Wei Zhong Ju , Li Bo , Chen Shao Jie
Published: March 2011

The creep test of the No. 3 coal seam of Daizhuang Coal Mine is carried. Based on the experiment results, the creep support effect of deep pillar is analyzed with LS-DYNA. The results show that the circumferential initial creep stress of the tested coal is 3.061MPa and the circumferential initial creep stress is far below the axial initial creep stress which is 7.020MPa. In addition, the creep strength is 9.3266MPa and the creep coefficient is 0.6472. According to the test results, the creep support effect of deep strip pillar can be simulated excellently with LS-DYNA. Stress and deformation in simulated strip pillar show evident rheology. Many changes will take place in the stable situation of pillar after the working face mining. Under the effect of the overlying strata, this pillar turns into steady creep state after 15~16 months, then the pillar is able to maintain long-term stable state.
Effect of Press on Thermal Contact Resistance
Authors: Huang Hai Ming , Jiao Wen
Published: March 2011

The thermal contact resistance between polymer composites and aluminum alloy is the main parameters of thermal control design in the field of space and its heat transfer mechanism is very complex. This work is to combine experimental and numerical approaches to evaluate the nature of thermal contact between polymer composites and aluminum alloy. Thermal contact resistance between carbon fiber reinforced epoxy composites and aluminum alloy 380 was measured experimentally. And based on the finite element method, the simulations on heat transfer between polymer composites and aluminum alloy have been performed and compared with experiment results. The results show that the thermal contact resistance between carbon fiber reinforced epoxy composites and aluminum alloy is not negligible and strongly correlated with pressure.
A New Design of Inflatable and Lightweight Device for Planetary Exploration
Authors: Liu Long Bin , Liu Dong Xu , Lv Ming Yun
Published: March 2011

Inflatable structures have many potential applications in space collapsible structures, this paper based on the premise of the same exploring features on the Planetary Exploration Device (PED) designs a new type of inflatable and lightweight model of PED. The device structure is designed to be a wheel style, which can be folded together in the transport process and in non-working state. Comparing with traditional devices, the new Wheeled Planetary Exploration Device (CWPED) reduces the space of transporting the exploration equipments and decreases the transport costs, moreover, this device provides convenient conditions for the equipment package of the CWPED, and there are evident advantages in the aspects of handing, solar absorption, volume and quality. This article mainly introduces the preliminary design of the CWPED, and the structural characteristics of the device, the principle of motion control and the design of wheeled body skin material are analyzed.
The Relationship Analysis of Surrounding Rock Stability and Continental Sedimentary Environment
Authors: Liang Cui , Zhang Chao , Ma Nian Jie , Wen Ming Ming , Li Chong
Published: March 2011

The continental coal-bearing strata are mainly formed in the flood plain, delta plain and lake shore subfacies. Through the study on the sedimentary cause of differences of rock strength and sedimentary location, the paper analyzes the internal relationship between sedimentary environment and surrounding rock stability based on different coal-forming models. To take an example of Shendong Coal Mine Area, the differences of surrounding rock stability in various sedimentary environments are quantitative analyzed. The paper’s research promotes the combination between surrounding rock stability and sedimentology.
Compatibility of Polyethersulfone/Polycarbonate Blends
Authors: Jiang Dong , Zhang Xiao Ran , Ma Yan Mei , Ma Cheng You
Published: March 2011

polycarbonate (PC), polyethersulfone (PES) and a multi-block random copolymer of PES and PC were blended. It was found that the interfacial adhesion was enhanced, the size of the dispersed phase was reduced and PES and PC formed an interlocking structure with the copolymer, which suggest the addition of the compatibizer may improved the miscibility between PES and PC, and result in the improvement of the mechanical properties of the blends. The compatibility behavior of PES with PC was examined using differential scanning calorimeter (DSC), scanning electron microscope (SEM) and SAXS.
Pseudo-Potential Calculations of Structural, Elastic and Thermal Properties of Si3N4
Authors: Yu Ben Hai , Chen Dong , Jia Yong Lei
Published: March 2011

The ground-state lattice constants, bulk modulus and six independent elastic constants of β-Si3N4 have been calculated through the framework of density functional theory within the plane-wave pseudopotential method. The quasi-harmonic Debye model, by means of total energy versus volume calculations obtained with the plane-wave pseudo-potential method, is applied to the study of the thermal, elastic and vibrational effects. In the temperature interval 0--1800K, the calculated results agree reasonably with numerous experimental and theoretical data. Other thermal outcomes gained from this method provide overall predictions accurately for the temperature and pressure dependence of different quantities such as the thermal expansion, heat capacity and Debye temperature. The variations of Debye temperature ӨD with temperature are analysed, which show the temperature has hardly any effect on ӨD. Therefore, the present study indicates that first-principles combined with quasi-harmonic Debye model is an effective way to stimulate the behaviors of solids at simultaneously high temperature and pressure.
Technical Parameters Model of Laser Direct Metal Deposition
Authors: Zhang Wei , Yao Jian Hua
Published: March 2011

This paper was focus on the technical parameters matching model of laser direct metal deposition（DMD）forming. Based on a series of DMD forming experiments, the energy balance equation of laser power, beam radius, powder feeding velocity and scanning velocity was established which could provide a theoretical principle for parameter selection and optimizing.
Prediction of Coal Production Based on BP Neural Network
Authors: Wen Ming Ming
Published: March 2011

It is significance to predict coal production for balancing coal supply and demand in China. The primary goal of this research is the prediction of coal production in china. The method used in the study is known as the BP neural network. The BP neural network is designed with the MATLAB simulation software based on coal production historical data from 1980 to 2007. The studies we have performed showed that the prediction of coal production based on BP neural network is reasonable and valuable. Finally, we get the prediction of coal production from 2010 to 2015, and the prediction indicates that the coal production will increase in the next 5 years.
Synthesis, Characterization and Oxidation Behavior of a Novel Curable Liquid Polysilane Precursors for C/C-SiC Composite
Authors: Guo Kang Kang , Liu Yan Bing , Qi Hui Min , Huang Fa Rong , Du Lei
Published: March 2011

A novel curable liquid polysilane (CLS) containing reactive unsaturated bond and Si-H was synthesized from dichloromethylvinylsilae, methyldichlorosilae and Na in presence of 18-crown-6 under sonication at relatively lower temperature and its structure was characterized by FT-IR, 1H-NMR. The cure behavior of CLS was investigated by DSC,FTIR. Thermal stability of cured CLS was examined by TGA. The results showed that the cured polysilane exhibits good anti-oxidation performance under high temperature. And the sinted CLS exhibited high temperature resistance and good ceramic formability.
Effects of RE and Sb on Microstructure of Mg3Al Based Magnesium Alloy
Authors: Sun Hua Wei , Liu Sheng Xin , Deng Jing , Miao Jin Qi , Guan Shao Kang , Chen Yong
Published: March 2011

The influences of Ce, La, Nd, Y, Sb, Zn and Mn on microstructures of Mg3Al alloys were investigated. The formation of needle-like Al-RE compounds in Mg3Al alloys added 1%RE have close relations with the type of RE element. La and Ce help the acicular phase formation in Mg3Al alloy, which mainly are Al4RE, while, granular Al2RE phases were observed in the Mg3Al alloys with 1%Nd and 1%Y. However, spherical CeSb instead of needle-like Al4RE were found in Mg3Al alloy with 1%Ce and 1%Sb addition. There were not essential differences between the microstructure of Mg3Al-1%Ce-1%Sb and AZ31-1%Ce-1%Sb alloys.
Comparative Study on HPC Mix Design Methods
Authors: Fan Liang , Zhang Lei , Li Fu Hai
Published: March 2011

Introduction on superiority of high performance concrete (HPC), then present and compare five methods of HPC mix design in detail. Both fixed grout volume method and cement coefficient method are concentrating on the research of cementing materials. Infilled coefficient method and mix design method based on the best paste-aggregate ratio obtain the optimized sand ratio in the best voidless condition. Overall calculation method is based on the volume model, elicits formula of sand ratio and water consumption and ends the method of looking up the table for sand ratio and water content. Through the comparison of methods, we find that it's a trend that HPC mix design method can develop from semi-quantitative to quantitative, from experience to science.
An Amperometric Immunosensor Based on a Polyelectrolyte/Nano Gold Particle Layer-by-Layer Assembly Modified Electrode for the Determination of Clenbuterol in Meat
Authors: Gao Li Juan , Gan Ning , Hu Fu Tao , Cao Yu Ting , Zheng Lei
Published: March 2011

This paper introduces a novel amperometric immunosensor consisting of hemin (Fe(III)-protoporphyrinIX) layers formed by layer-by-layer assembly for determination of clenbuterol (CLB). Layer-by-layer assembly of hemin with Poly(allylamine hydrochloride) (PAH) is achieved on the electrode surface which is modified by single-wall carbon nanotubes (SWCNTs) based on the electrostatic attraction between negatively charged hemin and positively charged Poly(allylamine hydrochl- oride). The modified electrodes were characterized by cyclic voltammetry (CV), scanning electron microscope (SEM), and X-ray photo electron spectrum (XPS). The decrease of current results from the increasing concentration of CLB antigen, which leads to a linear decrease in CLB antigen concentration ranges from 0.5 ~ 10 ng/mL with the detection limit of 0.2 ng/mL (3σ).
The Design of High-Precision Capacitance Micro-Displacement Sensor
Authors: Wang Li Jun , Wang Dong Fei , Wang Xu Hu , Shi Shu Heng
Published: March 2011

This paper presents a design method of capacitance micro-displacement sensor, based on the programmable capacitance-digital converter AD7746. AD7746 is controled by Single-Chip Microcomputer which gathers the variation of capacitance from the plates and converts it to the digital quantity.The SCM PIC16F877 connecting with AD7746 through the I²C bus reads the digital quantity converted by AD7746 through software programming, then transmits the data into PC through serial interface,in which the whole high-precision capacitance displacement sensor design is accompished.
The Design of Remote Monitoring and Diagnosis System Based on Virtual Instrument
Authors: Wang Li Jun , Guo Hui Juan , Wang Dong Fei
Published: March 2011

Based on the background of the continuous development and application extensive of the remote monitoring and diagnosis, we develop a remote fault diagnosis platform,which can be used as remote fault diagnosis service window. The client and the server can be used for data analysis and processing, also on data management to achieve remote monitoring and diagnosis. Meanwhile we design a remote data analysis system in LabVIEW environment to realize the signal analysis and transmission. In order to strengthen the system network measurement function, this paper introduces DataSocket and TCP/IP technology in the remote transmission, which is a new technique in improving the ability of the remote data transmission.
A Study on the Nail-Plate Connection Performance of Light Wood-Frame Structure
Authors: Xu Guo Lin , Bai Ya Shuang , Zhu De Bin , Chen Wen Gang
Published: March 2011

Light wood-frame structure, as not only has good seismic performance, but also can give full play to its ligneous advantages such as light mass, high tenacity, energy saving and environment protection, is widely applied to low-rise buildings and villas. The rigidity and ductility of shear wall structured by wood-frame are closely related to its sheathing material and the nail layout. In order to give full play to the carrying capacity of the nailed connection nodes, the article adopts the finite element model to compare the stress distributions of sheathings with different nail spacing, and the carrying capacity of the connection at the point of the sheathing is destructed, and also to provide the reasonable value of nail layout and a reference for the actual structural design.
Modeling and Simulation of Single-Phase Full Bridge Two-Level PV H6 Inverter Connected to Grid
Authors: Guo You Gui , Zeng Ping , Zhu Jie Qiong , Li Li Juan , Deng Wen Lang , Blaabjerg Frede
Published: March 2011

PLECS is used to model the PV H6 inverter connected to grid and good results are obtained. First, several common topologies of PV inverters are introduced. Then the unipolar PWM control strategy is described for PV H6 inverter. Third, PLECS is briefly introduced. Fourth, the modeling of PV H6 inverter is presented with PLECS. Finally, a series of simulations are carried out. The simulation results tell us PLECS is very powerful tool to real power circuits and it is very easy to simulate LCL filter. They have also verified that the unipolar PWM control strategy is feasible to control the PV H6 inverter.
Preliminary Studies on Luoyang Leisure Sports
Authors: Liu Yi Wei
Published: March 2011

With the rapid economic development of Luoyang, more and more people pay attention to the health, which make the leisure sports become a key form of social sports. Nowadays more and more people are fond of leisure sports. The paper analyzed the contents and functions of leisure sports, and discussed the present situation of it. Finally the author gave some good suggestions to leisure sports of Luoyang.
Dynamic Response Analysis of Stress Intensity Factors of Reflective Cracking in Asphalt Overlay Suffer Wheel Load
Authors: Yang Bin , Huang Qin Shou , Qiu Xin Wang , Xu Hua
Published: March 2011

Partial wheel loading of the existing old cement concrete pavement joint will easily causes shear-type reflective cracking of asphalt overlay, which will cut down the service life of the pavement. This paper conducts an research on the changing rules of stress intensity factors of reflective cracking in asphalt overlay suffer dynamic loads. Choose 3 asphalt overlays with typical reflective cracking extend length of 1cm, 4cm and 8cm to investigate the impacts of parametric variation of vehicle speed, asphalt overlays thickness and modulus and stress absorbing layer on stress intensity factors of reflective cracking in asphalt overlays suffer singe-wheel dynamic loads. Results show that time history curves of dynamic stress intensity factors declines with the increase of structure-layer parameters; the maximum amplitude decreases as time goes on; the larger the structure parameter is, the faster the degradation is; and the vibration levels to gentle in the later half period, but stress intensity factors are not equal to zero in the last period of vibration, which shows that there exists residual stress intensity factors.
Fuzzy Comprehensive Assessment Methods on the Multi-Objective Decision of Hot Water Supply System Plans of Residential Buildings
Authors: Wang Zhi Wei , Zhao Ji Feng , Gao Zhi Jie
Published: March 2011

For the different hot water supply system plans of residential buildings, this paper established multi-objective factors fuzzy matrix based on fuzzy set concept, proposed a new dynamic preference function for fuzzy comprehensive assessments, using two kinds of methods i.e., the Weighted Relative Deviation Distance Minimum (WRDDM) method and the Quantitative Index Comprehensive Decision Making(QICDM) method, the optimal plan can be chosen. Due to the time and space consideration of the new preference function, the fuzzy comprehensive evaluation (FCE) method can be used for the multi-objective optimization of hot water supply system plans of residential buildings in different regions and different periods.
Study on Statistical Damage Constitutive Model of Rock Basing on Thermdynamics
Authors: Liu Wen Lian , Wei Li De
Published: March 2011

Statistics models are effective to describe the relation of strain-stress of rock. But the constitutive relations in the statistical models are too simple for rock. Using the Eshelby equivalent inclusion method, a Helmholtz free energy for e damage rock is set up in the present paper. A constitutive model for damage rock is set up . The presented model is verified as reasonable and practical with comparion to the experiment data.
Study on Management Control Auditing on Construction Project
Authors: Wang Xiao Yan , Fan Shao Yan
Published: March 2011

Management and auditing of construction project, which is a certain trend of management development of modern construction project, is a new theory in audit practicing of construction project and an effective way to work out at the highest degree the returns on construction project investment, improve construction project management performance levels, avoid at the highest degree redundancy of construction projects and eliminate waste of resources. This essay points out the importance of the use of management auditing in construction projects based on the analysis of disadvantages in conventional construction projects management. And it builds up frame for management auditing of construction projects, puts forward performance evaluation methods of management control auditing.