bluuebunny/crossref_metadata_2025 huggingface dataset:
The Influence of Mechanical Vibration Moulding Process on Thermal Conductivity and Diffusivity of Al-TiC Particulate Reinforced Composites
Authors: Sayuti Muhammad , Sulaiman Shamsuddin , Vijayaram Thoguluva Raghavan , Baharudin B.T. Hang Tuah , Arifin M.K.A.M.
Published: August 2011

Titanium carbide particulate reinforced composites were fabricated by vibrational moulding sand casting technique. Titanium carbide particulate added as a reinforcement phase in the LM6 alloy matrix and the percentage of addition varied from 0.2, 0.6, 1 and 2% on weight fraction basis. The thermal conductivity and diffusivity of TiC composites were determined. Increasing frequency of vibration and TiC content helps to improve density, thermal conductivity, thermal diffusivity and purification of the grain boundaries. The dispersed particles increased the thermal conductivity and diffusivity according to an effective media theory.
Study on Multi-Axial Mechanical Properties of a Polyurethane Foam and Experimental Verification
Authors: Han Shou Hong , Lu Zhen Hua , Liu Yong Jin
Published: August 2011

In order to investigate the multi-axial mechanical properties of a kind of PU (polyurethane) foam, some experiments in different loading conditions including uni-axial tension, uni-axial compression, hydrostatic compression and three-point bending were conducted. It is shown that the hydrostatic component influences yield behavior of PU foam, the yield strength and degree of strain hardening in hydrostatic compression exceed those for uni-axial compression. In terms of the differential hardening constitutive model, the evolution of PU foam yield surface and plastic hardening laws were fitted from experimental data. A finite element method was applied to analyze the quasi-static responses of the PU foam sandwich beam subjected to three-point bending, and good agreement was observed between experimental load-displacement responses and computational predictions, which validated the multi-axial loading methods and stress-strain constitutive model parameters. Moreover, effects of two foam models applied to uni-axial loading and multi-axial loading conditions were analyzed and compared with three-point bending tests and simulations. It is found that the multi-axial constitutive model can bring more accurate prediction whose parameters are obtained from the tests above mentioned.
Direct Synthesis of Yttria-Stabilized Zirconia Nanopowder by Thermal Decomposition
Authors: Chen Yue Jun , Wang Zhi Fa , Bu Jing Long , Yu Li Xue , Wang Rong Lin , Wang Rui Sheng
Published: August 2011

An easy synthesis route of YSZ (Yttria-Stabilized Zirconia) nanopowder with the formation of Zr0.92Y0.08O1.96is synthetized by using thermal decomposition of ZrOCl2and Y(NO3)3, with polyvinyl alcohol (PVA) as surface active agent and with quantitative filter paper as carrier. The roasting temperature of YSZ precursor was 650oC. The results of SEM and XRD analysis showed that the pure ZrO2and YSZ powders prepared via thermal decomposition had better crystallinity, and YSZ powders had perfect crystalline t-ZrO2phase after heating at 650 °C, and changing the amount of PVA or the reaction precursors could obtain YSZ powders sized 20-50 nm.
Thermodynamic Analysis of the Extension of Solid Solubility of the Cu-Cr System Processed by Mechanical Alloying
Authors: Shi Kun Yu , Shen Tao , Xue Li Hong , Chen Chun Hao , Yan You Wei
Published: August 2011

The nanocrystalline Cu-5wt.%Cr alloy powders were prepared by mechanical alloying. The structural changes were characterized by X-ray diffraction (XRD) technique. A thermodynamic analysis was carried out to predict the change in the solubility limit of this system. It was found that the energy resulting from the MA process is sufficient to increase the solid solubility of immiscible Cr-Cu system. The solid solubility may be extended up to 5 wt.% Cr in Cu after 20 h milling. The formation of the supersaturated solid solution leads to the decrease of Cu lattice parameter. However, it decomposes with the further increase of the milling time, which leads to the increase of Cu lattice parameter.
Design of Sample Holders for Soil Experiments Using THz Spectroscopy
Authors: Li Bin , Wang Mao Hua , Wang Ning
Published: August 2011

Terahertz spectroscopy (THz) is a brand-new radiation source with many unique advantages. It owns many potential applications in all area. An experiment was carried out on soil heavy metal detection using THz in Jun., 2010 at Oklahoma State University. Two types of sample holders (1.5mm thickness and 3 mm thickness) were designed based on specific requirements and applications in this paper. The optical material, size, thickness of the sample, thickness of the side-wall, property of samples for holding, adhesive materials, cost were discussed in detail; then, an integrated description were given and a 3-D model was established. Real holders were manufactured based on the former design and their THz characteristics were measured. At last, the holders were used in the current soil heavy metal detection experiment. The results showed that, the designed holders showed low absorption of THz and low reflection. Two thickness samples holders all performed well in the experiments, however, for the soil measurement, the sample information could not be completely collected before echo wave came. The 1.5mm thickness holder was selected in our experiment. The designed sample holders are feasible and this research provides a good solution for the difficulties we met in our experiment.
Determination of Optimal Cold Reduction Ratio and Annealing Process of High Plastic Stain Ratio Structural Cold Rolling Steel Sheets
Authors: Wang Min Li , Zheng Zhi Wang , Xiao Li
Published: August 2011

Hot rolled high plastic stain ratio structural steel sheets was used to study the effect of cold reduction ratio and annealing process on the microstructures and mechanical properties. The results showed that the structural steel sheets was recrystallize finished after cold rolling follow different cold reduction ratio and batch annealing(annealing temperature 670°C and soaking time 5h) under experimental condition. When the cold reduction ratio was increased, the yield strength and tension strength increase, the elongation reduced followed different heating speed. The plastic strain ratio r value reached the maximum with cold reduction ratio of 50%, when the cold reduction ratio was increased, the r value was gradually reduced, However, the strain hardening exponent n value was gradually reduced. In the end, that suggested the optimal cold reduction ratio is 40% to 50%, and heating speed is 20°C/h, consequently that obtained good match of mechanical properties and punching property.
Modeling of Flow Stress for one New Kind of Metastable β Titanium Alloy at High Temperature
Authors: Wang Zhe Jun , Qiang Hong Fu , Wang Xue Ren
Published: August 2011

Based on the characteristics of the flow stress curves for one new kind of metastable Ti2448 titanium alloy from isothermal hot compression tests, the constitutive model was developed to describe the relation between flow stress and strain, strain rate, deformation temperature completely. During this process, the flow behavior of alloy at high temperature undergo flow softening caused by dynamic recovery (DRV) was modeled by the adopted hyperbolic sine function based on the unified viscoplasticity theory, the further drop in flow stress after the peak value in stress-strain curves was assumed to be caused by temperature rise and the constitutive model was modified accordingly. Additionally, the material constants were determined by optimization strategies, which is a new method to solve the nonlinear constitutive equation. The stress-strain curves predicted by the developed constitutive model well agree with experimental results, which conﬁrms that the developed constitutive model gives an accurate estimate of the ﬂow stress of Ti2448 titanium alloy and can provide an effect method to model the flow behavior of metastable titanium alloy at high temperature.
Modeling and Experimental Study on Static Characteristic of BT Tool Holder-Spindle Interface
Authors: Shen Zhi Yuan , Zhang Jian Fu , Wu Zhi Jun , Feng Ping Fa , Xu Chao
Published: August 2011

Aiming at the problem of the influence of joints on machine structure static performance, this paper presents a method of modeling and experiment on static characteristic of BT tool holder-spindle interface. A FEA model of tool holder-spindle interface is established by setting several equivalent springs, whose parameters are identified through experiment. The effectiveness of the proposed method is tested and verified by building finite element model and applying the spring parameters to it. The comparison between the emulational result and experimental result shows that the simulation accuracy has improved tremendously, which the relative error reduces to less than 10% under different axial forces.
Distortion Analysis on Multipassed Butt Weld Using FEM and Experimental Study
Authors: Redza Mohd Ridhwan Mohammed , Manurung Yupiter H.P. , Ak. Lidam Robert Ngendang , Sulaiman Mohd Shahar , Abdul Rahim Mohammad Ridzwan , Abas Sunhaji Kiyai , Tham Ghalib , Chau Chan Yin
Published: August 2011

This paper investigates the simulation technique for analyzing the distortion behavior induced by welding process on welded plate which was clamped on one side. This clamping method is intended to enable the investigation of the maximum distortion on the other side. FEA software SYSWELD was employed to predict multipassed butt weld distortion of low carbon steel with thicknesses of 6 mm and 9 mm. The simulation begins with the development of model geometry and meshing type followed by suitable selection of heat source model represented by the Goldak’s double ellipsoid model. Other parameters such as travel speed, heat input, clamping method etc. were determined. The model is dedicated for multipass welding techniques using Gas Metal Arc Welding (GMAW). The experimental works were conducted by using Robotic welding process.
The Effect of Co and Cu on the Creep Properties of High Chromium (12%Cr) Ferritic Steel
Authors: Shen Xi Xun , Liu Jun Liang , Xu Zhou
Published: August 2011

In this paper, three kinds of 12% Cr ferritic steels without Co and Cu, with 3%Co and with 3%Cu are produced. The addition Co and Cu lead to an evident increase in creep-resistant of the ferritic steel, and furthermore also markedly affect the fracture behavior. Microstructures were studied by comparing three kinds of the 12% ferritic steels to better understand different in those creep behaviors and fracture behaviors. It was found that the addition of Co and Cu not only inhibit the formation δ-ferrite but also are benefit for the growth of prior austenite grains. Additionally, the part of the added Cu precipitates in the matrix of the ferritic steel. These changes in microstructure and the solution of Co and Cu strengthen the ferritic steel.
Theoretical and Experimental Study on Nondestructive Pulse Phase Infrared Thermography Testing Technology
Authors: Tang Qing Ju , Liu Jun Yan , Wang Yang
Published: August 2011

The non-destructive pulsed phase thermography technique was used to detect metal specimen with flat blind-bottom holes and composite specimen with sticky areas. An experimental platform was built base on the analysis of the pulsed phase thermography testing principle. Experimental results show the different testing effect of the original thermography, amplitude and phase images.
Buckling Analysis and Experiment of Fiber-Paper Honeycomb Sandwich Structure Composites
Authors: Yang Xiao Jun , Lan Qing Shan , Zhong Yu Ning
Published: August 2011

The aim of this paper is to present a finite element method to predict buckling characteristics of paper honeycomb sandwich panels with composite skins under dynamic axial compression via ANSYS/LS-DYNA. First of all, some problems of the conventional method using honeycomb plate theory, sandwich laminboard theory and equivalent panel theory were pointed out. In order to develop an effective predicting method, by assuming appropriate periodic boundary condition on the edges, a simplified finite element model on hexagonal structure of a unit cell for sandwich panels was developed utilizing the 3D finite element method. The effective Young's modulus of the cellular wall was obtained from the result of the test on the honeycomb core. Several useful conclusions are drawn about the axial crushing of honeycomb sandwich composites and unit cell and can be used to guide the design of composite structures. The paper further attempts to explain numerical results are well consistent with the corresponding experimental ones.
A Carbon Dioxide Detector Used in Earthquake Ruins
Authors: Wen Ming , Zhang Ce
Published: August 2011

This document deals with the study of a carbon dioxide detector, which is used in survivors searching in earthquake ruins. In order to find the carbon dioxide of exhaled gases of earthquake survivors in the narrow space, we compared the different types of carbon dioxide sensors. At last, we selected the infrared sensors, which direct access to digital signals through the microcontroller, and has a temperature compensation function. The result of measuring was displayed in a vacuum fluorescent displayer. When it achieves the preset value, the sound and light alarm will be triggered. The test results show that the detector is fit for narrow space survivors search.
Research of Temperature Compensation Methods on High Accuracy Pressure Sensors
Authors: Wang Ji Lin , Xia Shu Lan
Published: August 2011

The temperature characteristics of semiconductor will make the zero point and sensitivity of the piezoresistive pressure sensor drift with the temperature,that is the main factor of the measurement error caused by pressure sensor.For high precision pressure detecting system, temperature drift has become the important obstacles when needing to increase the performance of the system,especially in the domain where the environment temperature changes greatly . Based on comparing the advantages and disadvantages with other methods ,this paper puts forward a kind of temperature compensation method which combines polynomial curve fitting and cubic spline interpolation, it can improve the performance of the system well.
Applications of Composite Spatial Structure
Authors: Wang Fan
Published: August 2011

The application of fiber reinforced polymer (FRP) rebar to large Span Spatial Structure is one of the topics in forward position nationwide and internationally. The properties of FRP rebar, such as high tensile strength, light weight, strong resistance to corrosion and fatigue, material design ability and weight reduction and so on, pave the way to its application to Large Span Spatial Structure. Based on the summary of relevant studies at home and abroad, the applications and research of FRP, such as CFRP poles, Composite Laminated Plate and FRP light roof, rebar to Large Span Spatial Structure are introduced in the paper. Finally, the prospects and some problems needed to further researched are put forward.
Research on Speed Observer of PMSM Servo System
Authors: Huang Rui Ning , Song Cheng , Liu Xiao Hui , Lou Yun Jiang
Published: August 2011

The incremental optical encoder is widely used in PMSM servo system for speed detection. However, this method is detected the average speed, which will cause delay time, and make the speed control system unstable at low speed range. A speed observer was designed in this paper, which is combining state observer and Kalman filter to estimate instantaneous speed. Simulation results show that this method can improve the speed detection accuracy of the PMSM servo system.
Study on Neural Network Control Strategy of Electric Vehicle in-Wheel Motor
Authors: Chen Xu , Li Da Wei , Jiang Zhen Jiang
Published: August 2011

The brushless direct current motor(DC) simulation model based on neural network control strategy is developed, according to the physical structure of the motor, after the analysis of in-wheel motor mathematical model. The simulation has pulse width modulation (PWM) generation module,which can adjust the PWM duty cycle to regulate the motor speed. Simulation results show that there is good agreement between the output ofsimulation model and the theoretical analysis.The application of neural networkcontrol in brushless DC motor offers the advantages of rapid response, without overshoot ,and higher steady-state accuracy.
The Harmonic Analysis of Power System
Authors: Ma You Jie , Yang Ya Guang , Zhou Xue Song
Published: August 2011

This document mainly analyses the sources of harmonic and harmonic hazards in power system. The article mainly from a few key links of power system which are electric power capacitor, power transformer, electric motors, relay protection to illustrate harmonic hazards and described harmonic treatment methods.
Development and Application of Online Monitoring System for Blast Furnace Hearth and Bottom
Authors: Long Hong Ming , Li Jia Xin , Wang Ping
Published: August 2011

The campaign life of a modern blast furnace is determined by the residual thickness of the refractory in the hearth and it can be prolonged by adjusting operating conditions based on a reliable online monitoring system. A new methodology, combining a 1-D heat transfer model and a statistical model to predict the inner profile and the refractory lining of a blast furnace during operation respectively, was established in this study. The application of the developed online monitoring system on a blast furnace was used to demonstrate the effectiveness of the models.
Design of a Temperature Measurement System Using LabVIEW Virtual Instrument Modules
Authors: Li Yan , Ma Wen Kui , Liu Jun , Wang Sheng
Published: August 2011

The LabVIEW virtural instrument platform was established to measure the temperature by the thermocouple with a temperature compensating.The LabVIEW virtual instrument technology is efficiently used to implement a number of significant measurements, which was designed by the PC computer connected with a data acquisition device. Compared with the traditional temperature measurement device, this system has the advantages of simple structure, low cost，easy operation and high stability.
Research of Corrosion Monitoring System for Metal Coatings
Authors: Liang Yi , Wei Shi Cheng , Sun Hu Yuan , Liu Yi , Wang Yu Jiang
Published: August 2011

A metal coating corrosion monitoring system (CMS) based on corrosion potential was introduced. It’s working principle, especially the design and selection of soft and hardware and the main technical specifications. The system has the characters of real-time monitoring of changes in corrosion potential status of coatings, automatically storing corrosion information and alarming according to corrosion degree in monitoring sites.
Nonlinear System Fault Detection Based on TLLE
Authors: Zhang Wei , Zhou Wei Jia , Liu Xiao Yuan
Published: August 2011

In this work, a nonlinear system fault detection approach based on tangent space distance locally linear embedding (TLLE) is proposed. In the algorithm, tangent space distance is introduced to LLE, which overcomes the shortcoming of original LLE method based on Euclidean distance. It can satisfy the requirement of locally linear much better and so can express the I/O mapping quality better than classical method. Simulation results are given to demonstrate the effectiveness of the fault detection algorithm based on TLLE method.
The Adaptive Control of Electric Pitch Servo System
Authors: Dong Hai Ying , Sun Chuan Hua , Wei Zhan Hong
Published: August 2011

The characteristics of electric pitch servo system are multivariable, nonlinear. In this paper, adaptive control method is used to satisfy the performance of rapid response, anti-interference and the location fast response non-overshoot. Neural networks model reference adaptive control is used in the speed loop to enhance the anti-interference performance and robustness. Fuzzy adaptive control is used in the position loop to satisfy the performance requirements of fast response and non-overshoot. The simulation results show that the adaptive control not only ensures strong anti-interference performance and robustness, but also achieve rapid response and non-overshoot exact location.
The Use of Ant Colony Model in the Staff Deployment Problem
Authors: Zhang Wan Li , Zhang Bi Xi , Qiu Wen Rong
Published: August 2011

For the complex features of many varieties, varying quantities of inserting production, we use such a complex system as Swarm intelligence to study the process of the production line of SMEs setting up and human resources scheduling. Based on the analysis of the operating characteristics of production cell and their comparison labor division model of the ant colony, it re-designs the workers’ features and the deployment of staff between the Production cells and finally, realizes an adaptive division of labor model by the control of computer, depending on the production task requirements and each production cell load. The experiments show that the digital simulation results can match the real cases well.
Research of FMM Algorithm Acceleration Based on FPGA and Cell BE
Authors: Chai Ya Hui , Shen Wen Feng , Xu Wei Min , Zheng Yan Heng
Published: August 2011

FMM is an efficient algorithm in computing N-body problem. This paper firstly subdivides the FMM into 10 procedures. Based on the analysis the computing type of each procedure, we choose key procedures accelerated on FPGA and Cell BE. And then we present the speedup ratio of each accelerated procedure through experiments. Finally we analyze the computing characteristic of FMM on the computing architecture on accelerator FPGA and Cell BE.
Fabrication of Nano Logic Gates Based on ZnO Nanowires
Authors: Chang Ming , Lin Chung Po , Chen Hong Jun
Published: August 2011

With the rapid expansion of nanotechnology, assembling nano-materials and to create electrical/mechanical devices at micro and nano scales has become an increasingly important research area. An “OR” logical gate at nano-scale has been constructed with ZnO nanowires (NWs) via a mechanical nano-manipulator which placing inside the vacuum chamber of a scanning electron microscope (SEM). By means of the electrostatic interactions and the characteristics of ZnO NWs, the on/off effect between probe tip and NW can be controlled by controlling the voltage between them. Experimental results show that the fabrication of nano logic gates based on ZnO NWs is possible.
Physical Compensation of Quadratic Phase Aberrations in Practical Digital Holographic Systems
Authors: Zhang Yi Zhuo , Wang Da Yong , Meng Pu Hui , Wang Yun Xin
Published: August 2011

MEMS is believed as a most promising technology in future. DHM is a powerful technique to characterize the behavior of MEMS. In the reconstruction process of a digital hologram, aberrations always exist, which is always removed by the software installed in the computer. We propose a method to obtain an aberration free digital hologram. The optical arrangement is presented to verify the possibility of our method, which is then improved by a space-fiber hybrid system. The system is flexible and useful in designing a practical digital holography microscope.
Study on Sliding Mode Control for Permanent-Magnet Synchronous Motor Servo Systems
Authors: Tang Pu Hua , Lei Yu Yong
Published: August 2011

Permanent-Magnet Synchronous Motor is a multivariable nonlinear system with over-coupling and very sensible to outer disturbance and inner perturbance. To improve robustness of the servo systems, the method of Sliding Mode Control is introduced and a simple controller based on the algorithm of sliding mode control is developed in this paper. The simulation and experiment results demonstrate that the sliding mode controller designed is feasible and valid. It can offer a valid approach to the implementation of Permanent-Magnet Synchronous Motor servo systems.
Convergence Analysis and the Nested Refinement for the Trapezoid Finite Element
Authors: Wang Qi Sheng , Wang Xue Ling
Published: August 2011

In this paper, a class of the new method of nested refinement based on self-adaption grid is discussed. The level trapezoid grid nested refinement on the plan domain and some related properties are investigated, and the convergence results are obtained for the second order self-adjoint elliptic problem on the trapezoid finite element.
Study of the Realization and Application of Bio-Impedance Technology
Authors: Liu Chen , Liu Xiao Yan
Published: August 2011

As a non-invasive, functional measurement method, bio-impedance technology has been obtained certain application in clinical, however, it has still been in studying in most application fields. By reviewing the current development status of bio-impedance technology, the paper analyzes the future emphasis of development and technology direction, in order to make bio-impedance technology gain more widely clinical application.
The Development and Performance Analysis of a Tri-Proportion Controller
Authors: Chen Qi Fa , Wang Yu Cai , Luo Kai , Li Dai Jin
Published: August 2011

By analyzing the operating principle and building the mathematical model, the pressure characteristics of the tri-proportion controller are obtained. A simulation about the pressure characteristics is carried out, which shows the differential pressure and rotational speed are subjected to a linear relationship within the full measuring range. The simulation result agrees with experimental data very well, which shows the feasibility of this simulation method. Analyzing the pressure characteristics and the proportional control accuracy, we obtained the minimum differential pressure, the maximum differential pressure, the factors which affect the differential pressure and the relationship between the differential pressure and leakage. And finally we obtained the solutions of decreasing the leakage and improving the proportional control accuracy.
Research on Effects of Geomagnetic Induced Currents to Power Systems
Authors: Zhou Xue Song , Zhou Zhi Hao , Ma You Jie
Published: August 2011

Geomagnetic induced currents (GIC) that flows between the earth and the power grid may pose a threat to the safe operation of power system. Modern power grid construction with the features of high voltage, long distance and high-capacity, these will cause the network increases the risk. This paper briefly introduces the evaluation methods of GIC and influence and control measures, etc. The theory of algorithms, and measures to eliminate GIC should be more in-depth research.
Emergency Strategy of Civic Critical Infrastructure to the Urgent Events
Authors: Wu Zhi Li , Liu Xiao
Published: August 2011

Abstract. Civic critical infrastructure systems have become an inter-connected networked system due to the all kinds of interdependencies. Under the circumstance of emergent events, disruption or failure of one system may lead to the cascading effect on other interdependent systems. We develop a mathematic model based on supply and demand relation of multi-network systems considering the coupling characteristic of critical infrastructures when emergent events happen. The model can offer the emergency strategy to the urgent accident by analyzing events chain after single node fails. The numerical results indicate the approach taken in this research can break through the limit of conventional emergency strategy within single system of dispatching standby products as inventory and to better optimize the total loss of the whole networked system.
The Prediction Method on Warpage of Injection Molded Parts
Authors: Chang Tong Chen , Zhu Hong Yu , Wu Hai Hong
Published: August 2011

Warpage is a common defect resulted from uneven thermal shrinkage during injection molding process. In this paper, the authors investigated finite element method to predict the warpage of injection moldings with thin shell theory. In order to improve calculating accuracy, discrete Kirchhoff element combined membrane element with rotational degrees of freedom was used to build finite element model. The results predicted with this model were compared with experimental data. The results showed that this finite element model was effective to increase the prediction accuracy of the warpage because of bring transfer matrices to improve the element accuracy.
The Structure and Fluid Flow Analysis for a New DSH Dynamic - Static Combined Mixer
Authors: Wu Qing , Li Nan , Li Quan Lai
Published: August 2011

A new DSH type dynamic-static combined mixer, which combines the advantages of dynamic mixing agitator and SH type static mixer, with the structure of alternative connection of the turning impeller, liquid shunt unit and double-barreled helical stationary blade, is original designed by the author. The allotype impeller is driven by the two-phase flow and meanwhile the two-phase flow is sheared by the allotype impeller. The double helix eddy flow is formed out of two-phase flow by the stationary blade due to the shearing effect of allotype impeller which results in the improvement of mixture efficiency. The most characteristic of this design is: the mixture is driven by the dynamic force of liquid itself, therefore the energy is saved and the mixture efficiency is enhanced. Followed by the illustration of the structure, the preliminary analysis of the flow field is carried out, which provides some proofs for the selection and optimization of the static-dynamic combined high efficient mixer structural parameters.
Digital Lensless Fourier Holography with Optical Fiber and Reduction of Speckle Noise
Authors: Ma Xiao , Chen Li , Lin Qing Hua , Xu Huan Kun , Lei Sha , Liu Feng
Published: August 2011

Digital Lensless Fourier Holography setup for recording and reconstructing object is presented. By using optical fiber of high numerical aperture, almost-perfect spherical reference wave can be acquired. Pre-imaging method is used to enlarge the view-field of object. Speckle noise as multiplicative noise in digital holography can be transformed to additive noise through homomorphic transform. Median ﬁltering algorithm is successfully used to reduce speckle noise.
Dynamic Optimization Research on Self-Cleaning and Rotating Steel Spiral with Plastic Coat
Authors: Yu Tian Lan , Peng De Qi , Yu Tian Xiang , Liu Yang Ping , Shi Bing Le , Wei Biao , Zhi Xiao Heng
Published: August 2011

The self-rotating kinetic moment formula is derived through theoretical dynamic research on self-cleaning and rotating steel spiral with plastic coat. The moment is proportional to d (spiral wire diameter), sin2α (α-helical angle), D2 (D-spiral O.D), u2 (u-flow velocity), ρ (fluid density). The theoretical formula is consistent with experimental results. As a result, the formula can be the theoretical foundation to optimally design the steel spiral with plastic coat. The spiral is thicker with coat but the experiment results show the flow resistance is still in the general range of industry limitation.
FEM Simulation and Experimental Study on Miling Force for Aero-Aluminum Alloy Based on Trochoid-Motion
Authors: Yu Jin , Shi Yu Xiang , Yang Gui Wu
Published: August 2011

By analyzing the relative position between tool and workpiece in assemble model of finite simulation, and loading the tool with parallel motion and rotation, a finite element model based on trochoid motion is built. In order to reduce the simulation time and errors advanced meshing method was used to optimize the finite element model. This paper considers performance parameter of the workpiece, and researches a simulation of milling force on the Aero-aluminum Alloy 7075-T7451 by using ABAQUS. The milling force finite element model was verified to be feasible, and the result is reliable.
Study on Effects of Timber Production on Forest Carbon Storage
Authors: Zhang Xiao Jing , Wang Li Hai
Published: August 2011

The effects of timber production (mainly refers to cutting) on forest carbon storage can be studied from two aspects as follows:(1) calculate the original carbon storage of the forest vegetation carbon pools based on the forest survey results in the year of 2002, and then calculate carbon storage of 2006 in two cases according to the growth rate of wood. The first case is that calculate the forest carbon storage assuming the forest has not been cut. The second case is to calculate the carbon storage of the residual trees in 2006. The difference in value is the result this study needs to calculate. (2) Automatic measurement system LI-8100, commonly used for measuring carbon dioxide emission flux in soil, was adopted in this paper, and soil respiration rate of forest land in the growing season was measured according to coniferous and deciduous broadleaved mixed forest plots of different selective cutting intensity in Dongfanghong Forest Farm of Dailing Forestry Bureau of the Xiaoxing’anling Mountains. Then the effects of timber production on forest carbon storage were determined based on an overall consideration of the changes of vegetation and carbon storage of soil carbon pool.
Research on a New Detection Technique of FBG Using OTDR
Authors: Jin Xiu Mei , Lv Yu Mei , Du Li Feng
Published: August 2011

A new technique of using Optical Time Domain Reflectometry (OTDR) to detect the reflected power of FBG sensing array was researched systematically. The theoretical model between the reflected power detected by OTDR and the reflected wavelength of FBG was established by analyzing, and consequently the selection rule of FBG wavelength in OTDR detection system was proposed. Moreover, experiments about multi-combination of FBGs with high reflectivity were carried out. The cause of dummy peak and resonance peak in OTDR test curves were analyzed, and meanwhile the selection basis of FBG reflectivity was also given. Based on time division multiplexing theory, detecting low-reflectivity FBG by OTDR can increase the FBG multiplexing number greatly, which has wide prospect to be applied in FBG array detection.
Ultra-Low Carbon High Strength Weathering Steels
Authors: Liu Zhi Yong , He Xin Lai , Yang Shan Wu , Zhou Qiang Xue
Published: August 2011

The ultra-low carbon high strength weathering steel was trial manufactured. By Optical micrographs observation, scanning electronic microscope (SEM), transmission electronic microscope (TEM), accelerated corrosion test, the corrosion resistant performance of test steel and CortenB steel were studied. The results showed that yield strength, tensile strength, elongation and -40 °C impact energy of test steel reached 510MPa, 600MPa, 22% and 115J, respectively. Corrosion resistance of test steel was superior to that of CortenB. The microstructure of ferrite and bainite, quickly forming adhesive dense rust layers to improve the corrosion resistance of test steel.
Running Analysis when Change the Installation Angle of Cooling Fan for the Engineering Machinery Engine
Authors: Zhang Jian Zhuo , Gao Meng , Zhu Tian Zi , Li Kang Kang
Published: August 2011

Introduce the practicality of automatic angle modulation cooling fan used in the engine cooling, calculate the performance data when automatically adjusting angle fan in different installation angle during operation by Fluent, do a comparison analysis of the data, draw the curves of cooling fan flow-total pressure and flow-efficiency in the different installation angle, make sure the operation law of the fan and the range of adjusting angle, and proof the automatic angle modulation cooling fan meet the requirement of the engineering machinery engine cooling, adapt to the working conditions of engineering machine.
Application Research of NC Machining of Circular-Arc Aligned Gear
Authors: Yu Ying Liang , Ding Feng Qin , Miao Zhi Yi , Yang De Qing
Published: August 2011

Abstract: numerical control system is used to control the gear hob and gear blank in autorotation and linkage generative movement, to realize the machining of teeth shape and teeth dividing; and at the same time it controls the vertical displacement of the gear hob and the horizontal displacement of gear blank, to make a circular arc track whose radius is the sum of gear blank’s radius and gear hob’s radius, thus realizing the NC machining of circular-arc aligned gear. Before and after the machining of teeth form, transition arc is used to finish the trimming and thinning of the teeth thickness at the teeth end; on the prerequisite of machining the circular-arc aligned gear, this method successfully solves the puzzle of gear chamfering, and discharges all gear burr into the lower end of the teeth. The advantage of this machining method lies in that when the hob cuts deeper, as the both side-blades are cutting the work-piece at the same time, the thinning on both sides are quite symmetrical, and the fine symmetry remains during the uniform change of the teeth thickness. So, the machining precision of the parts is prior to the requirements in the drawing, and this method yields good effect, which broadens the application of NC technology.
Green Synthesis of Silver Nanoparticles Using Flos Sophorae immaturus Extract and Bactericidal Activity
Authors: Du Zhi Yun , Tang Zhi Kai , Mo Rong Qing , Lu Yu Jing , Jiang Yong Fu , Xue Gui Hua , Zhang Kun
Published: August 2011

Silver nanoparticles (AgNPs) were rapidly synthesized by treating silver ions with the extract of a well-known Traditional Chinese Medicine herb, Flos Sophorae Immaturus, at room temperature. The AgNPs were characterized by UV–vis spectroscopy and zeta potentials analysis. The bactericidal activity of the AgNPs against S. aureus and E. coli was investigated. The results indicated that the AgNPs synthesized by Flos Sophorae Immaturus extract were water-soluble nanoparticles with 30-60 nm size, zeta potential studies showed that the surface charge of the formed nanoparticles was highly negative, and the antibacterial activity of the green prepared AgNPs exhibited potent bactericidal activity on S. aureus and E. coli.
Research on Automatic Electroplating Product Line’s Scheduling System in Small Batch and Multi Types of Electroplating
Authors: Wang Shi Long , Tang Rui , Zhou Jie , Zhou Heng
Published: August 2011

Based on characteristics of small batch and multi types of electroplating, a new method on mixed line production is proposed for an enterprise. PLC is used as control core to achieve accurate docking of multi-hoists and coordination mechanism of hoists. A hoist control system of electroplating product line, which is flexible, safe, reliable and high degree of automation, is built via associating PLC with rectifier power supplies, inverters, sensors, drive units etc. This system greatly improves the automation and efficiency of electroplating product line.
Study of the Control Platform of Robot Ammunition Loading System
Authors: Li Hua , Xu Da , Zhang Jian , Lin Hai
Published: August 2011

Aimed at work characteristics and work environment of auto loading manipulator for large caliber gun, its control system based on double CPU is designed. Then the paper expounds the components of the entire control system and corresponding principle. The control system can test control algorithm and motion trajedy plan in order to develop new control strategy and short development time.
The Application of Fast Moving Target Detection Technology in Hanger Intelligent Surveillance System
Authors: Luo Wei , Li Zhi Wei
Published: August 2011

Several moving objects detection methods were compared and an improved method on the basis of consecutive frames difference was proposed. Color images captured with camera were transformed into gray ones and the gray ones were processed with median filter. The adjacent frames of any three consecutive ones were handled with differential operation to obtain two difference images and threshold value was set to transform difference images into binary ones. The binary images were dealt with by using opening operation. The location of moving aircraft was determined by performing two difference images with AND operation. The simulation results show that the improved method can effectively detect and locate the moving aircraft in intelligent surveillance system.
Calculus Method Research of Imagery Conceptual Network Based on Revision Calculus
Authors: Wang Hui , Ke Hong Chang , Zhang Li Juan
Published: August 2011

Through developing intelligent system of human-like thinking, national defense, economic, education, culture and so on will be impact. Constructing intelligence system of human-like intelligent mainly lies in how to effectively imitate the approach with which human use imagery to cognize. From psychological point of view, the process of cognitive is the transformation process of objects and attributes. Based on this thought, imagery of conceptual network is constructed based on imagery concept and attribute to store the overall planning information of imagery object conceptual. According to imagery conceptual network we build, calculus method imagery of conceptual network based on revision calculus is proposed to guide filling and revision of the nodes of imagery of conceptual network. According to the instance calculus given in the paper can be seen, the calculus method imagery conceptual network can fill and revise the nodes of imagery conceptual network, which can effectively imitate storing imagery and induction imagery of the human brain.
Study on a TBD Algorithm of Pulsed Laser Radar Sensor
Authors: Ma Peng Ge , Qi Lin , Liu Yi , Jin Qiu Chun
Published: August 2011

Using TBD to reduce the minimum detectable SNR can be used to detect weak targets of pulsed laser radar sensor. Firstly, the pretreatment measures are given to enhance the single frame SNR. Especially, with the width characteristic of laser target under high sampling rate, the down-sampling method is introduced, which can not only eliminate a large number of single-point noises, but also can solve the acquisition problem of relatively stationary or low-speed targets. Then the TBD algorithm based on HT is proposed. Finally, the experiments indicate that the algorithm has good detection performance and can detect single and multiple targets.
Grain Boundary Characteristics of 0.01 mol%V2O5-Doped ZnO-Bi2O3-Based Varistor Ceramics
Authors: Ju Jin Hua , Wang Hua , Xu Ji Wen
Published: August 2011

The effect of 0.01 mol%V2O5 on the grain boundary characteristics of ZnO-Bi2O3-based varistor ceramics is investigated in this work. The average grain size of ZnO was 13.3 µm. The ZnO-Bi2O3 system added with V2O5 content of 0.01 mol% exhibited not only a high nonlinearity, in which the nonlinear coefﬁcient is 25 and the leakage current density is 0.02 µA/mm2 and the voltage gradient of 31.1 V/mm, but also a good grain boundary characteristics, in which barrier height fB = 0.908 eV, depletion layer width w = 32.49 nm, donor density Nd = 0.810×1018 cm-3, and density of interface states Ns = 2.632×1012 cm-2.
Experimental and Numerical Research on Effective Thermal Conductivity of Granular Porous Media
Authors: Shi Yu Feng , Sun Wen Ce , Shi Li Hua , Cui Jing
Published: August 2011

Effective thermal conductivity of granular porous media is investigated by experimental and numerical methods. Using the unsteady heat conduction formula of semi-infinite body, effective thermal conductivity is obtained by measuring temperature field of the experimental system. In this experiment, solid particle is pebble and pore fluid is water or brine with salinity of 20.2%. Granular porous media is not applicable for fractal method, therefore based on structural character of granular porous media; two-dimensional cylinder model is used to calculate effective thermal conductivity of granular porous media in this paper. The simulation results correspond well with the experimental results. This proves that calculating effective thermal conductivity of granular porous media by using this two-dimensional model is accurate. This model could be extrapolated to unsaturated porous media. Research shows that effective thermal conductivity increases logarithmically with the increasing of saturation.
Elimination of Vibrio parahaemolyticus Contamination in Shucked Oysters (Crassostrea plicatula) to with Natural Antimicrobial Agents TeaPolyphenols
Authors: Shen Xiao Sheng , Qian Bei Lei , Wu Wei Hua , Cai You Qiong , Liu Cheng Chu
Published: August 2011

In this study, the survival of Vibrio parahaemolyticus in suspension in the presence of tea-polyphenols for 6h was first examined. The shucked oysters containing V. parahaemolyticus then were exposed to 2048μg/mL , 1024 μg/mL and 512 μg/mL tea-polyphenols for 4h and the population ofV. parahaemolyticusin shucked oysters was determined every 1h. In addition, shucked oysters containingV. parahaemolyticusexposed into the dose of 1024 μg/mL tea-polyphenols were held at various temperature (0, 5, and 20°C) to examine survival ofV. parahaemolyticusevery 6h till 24h. Populations ofV. parahaemolyticusinoysterwere determined using 3-tube most probable number (MPN) method. The study found that the MIC of tea-polyphenols to Vibrio parahaemolyticus suspension is 1024 μg/mL; when exposed to 2048 μg/mL, 1024 μg/mLand 512μg/mL tea-polyphenols for 4h, the population ofV. parahaemolyticusinshucked oysters decreased by 3.29,2.43 and 1.84 Log10MPN/g respectively; 0, 5 and 20°C,1024μg/mL tea-polyphenols can decrease the population of V. parahaemolyticusinshucked by 4.10, 3.32 and 3.00LogMPN/g at 24thh. Sensory analysis showed that treatments of tea-polyphenols at concentrations 1024μg/mL did not cause negative effects on taste of oyster meat. These results indicated that tea-polyphenols have bactericidal effects againstV. parahaemolyticusand can be applied to shucked oysters to reduce contamination of V. parahaemolyticus.
Wheel Rotation Algorithm Based Test Scheduling Strategy for Crosstalk Faults in High-Speed Ultra-Width Buses
Authors: Zhang Jin Yi , Ding Meng Ling , Wang Chun Hua , Li Jiao , Cai Wan Lin
Published: August 2011

To effectively test the signal integrity problems on high-speed ultra-width buses, a test scheduling strategy which is based on the k-line dividing theory and the Wheel Rotation algorithm is proposed in this paper. With k-line dividing theory, the ultra-width bus could be divided into many sub-buses consisting of k lines each. By testing all the k-line sub-buses in parallel with Wheel Rotation algorithm, the number of test patterns required for testing the crosstalk faults on high-speed ultra-width buses can be greatly reduced. Experimental results show that the proposed approach can significantly reduce the test time while retaining the test accuracy.
Parameters Extraction of Rotational Surface Using a New Method
Authors: Yan Luo Heng , Huangfu Zhong Min
Published: August 2011

The purpose of reverse engineering is to convert a large points cloud into a CAD model. Parameters extraction for rotational surface from measure data is an important problem in reverse engineering. Rotational axis is a crucial parameter of rotational surface. In this paper, random sampling consensus algorithm combined with Least-Squares method is used to extract the rotational axis of rotational surface. Experimental results show effectiveness, robustness and accuracy of this proposed approach.
Research on the Effect of Mg (II) Ion Concentration on the Luminescent Intensity of Tb Complex
Authors: Wang Li Hua
Published: August 2011

The effect of different concentrations of Mg (II) ion on luminescent intensity of Tb (III) complex material in ethanol, methanol and DMSO solutions has been studied. The results show that the quenching effect of organic solvents for the luminescence of Tb (III) complex material was in the order DMSO>methanol>ethanol. The Mg (II) ion of different concentrations has obvious quenching effect to luminescent emission of Tb (III) complex material in organic solvent. And the quenching effect of 0.2 mol/L Mg (II) ion is weakest. And the quenching effect of 0.8 mol/L Mg (II) ions is strongest.
The Mechanical Property of PLA Fibers under Heat Treatment
Authors: Yang Qing Bin , Sun Yong Jun
Published: August 2011

The PLA fibers are processed under heat treatment. The change of the strength, initial modulus and work with the temperature and time are analyzed. The results indicate that the temperature has remarkable effect to the mechanical properties when the temperature is higher than 130°C and the effects of the processed time to the PLA fibers is very serious when it is exceeds 20 minutes.