bluuebunny/crossref_metadata_2025 huggingface dataset:
Control System Research of 2-DOF Precision Positioning Table for IC Packaging
Authors: Feng Xiao Mei , Duan Xiu Bing , Zhang Da Wei , Liu Wen Kai , Sun Ai Li
Published: February 2011

In order to improve the precision and efficiency of IC packaging for wafer wire bonding equipment, a new 2-DOF positioning table of high speed and accuracy, directly driven by voice coil actuator, is put forward. By establishing dynamic model of VCA and positioning table, the electromechanical coupling control system based on minimum deadbeat response controlling algorithm is proposed. The prototype experiment shows that the new 2-DOF positioning table is robust and of good dynamic performance.
High Current Extended DC Arc Plasma CVD for Mass Production of Diamond Film Coated Hard Metal Cutting Tools
Authors: Lu Fan Xiu , Lv Yong Ping , Hei Li Fu , Tang Wei Zhong , Song Jian Hua
Published: February 2011

Diamond film coated hard metal cutting tools are indispensible for high efficiency machining of materials which are difficult to cut by ordinary tools, and are successfully used in the dry cutting of high silicon content Al-Si cast alloys, graphite, carbon reinforced composite (CRFC) and metal matrix composite (MMC) , ceramics, and many other materials. In the present presentation, a novel process of High Current Extended DC Arc (HCEDCA) plasma CVD for mass production of diamond film coated hard metal cutting tools is presented. Besides, a novel process for the pretreatment of the hard metal cutting tool substrate, which involves the idea of “surface engineering” consisting of boronizing and alkaline and acidic etching is also discussed, by which the adhesion of the diamond film coating to the hard metal substrate can be greatly enhanced. Highly adherent and uniform diamond film coatings are successfully obtained. Diamond film coated WC-6wt%Co indexable tool bits, drills, endmill samples have been produced and been shown having excellent cutting performance by field cutting tests in dry cutting of Al-12%Si cast alloy and Al-15% SiC MMC materials.
Sol-Gel Processing by Organic Polymer Addition for Silica Antireﬂective Coatings
Authors: Jin Rui Min , Li Ding Zhen , Tao Yan , Han Xiang Ju
Published: February 2011

Based on TEOS system and sol-gel process together with catalysts and organic polymer, the microstructure of SiO2 film is controlled. The films are characterized by ellipsometer and SEM respectively. The experimental results show an antireﬂective ﬁlm produced by incorporation of organic polymer in the precursor solution is a more effective method of effect the uniformly porous structures of SiO2 thin film on the glass substrate.
Research on Geometric Errors Model and Identification of 5-Axis Machining Center for Processing Turbo Molecular Pump Rotor
Authors: Zhao Wu , Liu Hao Ran , Wang Guo Ji , Liu Ling Bing
Published: February 2011

This paper investigates the accuracy evaluative factors of 5-axis turbo molecular pump rotor machining center.Using rigid body kinematics techniques and homogenous transformation matrices, the systemic geometric volumetric error model are established for error synthesis. Novel volumetric accuracy model can be verified effectiveness better estimation of machine performance, by means of physical simulation and measurement. The effect of the individual axis geometric errors can become increasingly significant as the chain of dependent axis is extended. The effect of the rotary axis and their errors cannot be ignored. Calculating volumetric accuracy as the maximum difference between the error vector at any two positions can be computationally intensive.
An Algorithm of Frequent Neighboring Class Set Mining with Constraint Class
Authors: Fang Gang , Ying Hong , Xiong Jiang , Wu Yuan Bin
Published: February 2011

In this paper, the purpose is to find a method that can be more suited to facial expression change and also improve the recognition rate. The proposed system contains three parts, wavelet transform, Fisher linear discriminant method feature extraction and face classification. The basic idea of the proposed method is that first extract the low-frequency components through wavelet transform, then the low-frequency images mapped into a low-dimensional space by PCA transform, and finally the utilization of LDA feature extraction method in low-dimensional space. The algorithms were tested on ORL and Yale face database, respectively. Experimental results shows that the proposed method not only improve the recognition rate, but also improve the recognition speed. This method can effectively overcome the impact of expression changes on face recognition, and play a certain role in inhibition of expression.
Theoretical Research on Fluorocarbon Surfactant of Fluorocarbon-Based Magnetic Fluid
Authors: Cui Hong Chao , Li De Cai , Li Jian Ling
Published: February 2011

In this paper, we briefly introduce the concept, composition and the research frontiers of nano-fluorocarbon-based magnetic fluids; then discuss the superior performance, classification and synthesis of the fluorocarbon surfactant in detail and systematically; last, we made an example to illustrate fluoro olefin telomerization method. Research on fluorocarbon surfactant is crucial for further exploration of its coordination to base liquid-perfluoropolyether and further preparation of fluorocarbon-based magnetic fluids.
The Impact of Green Purchasing on Enterprise Performance: Empirical Study of China Textile and Garment Industry
Authors: Yang Wei Feng , Zheng Xin Yi , Zhang Yue Lei
Published: February 2011

The impact of green purchasing on the enterprise performance was analyzed in this paper. An empirical study in the China textile and garment industry was carried out, and research results show that the five dimensions of green purchasing (Supply chain management, Ecological design, Operation management, External environment management and Environmental authentication) have significant impact on enterprise performance.
Detection of Weak Signals Based on RBF Neural Network Filtering
Authors: Li Jian Jun
Published: February 2011

The algorithm is presented in this paper based on the character about RBF adaptive neural network filtering needn’t previous information of input single and noise and has better ability of nonlinear mapping and self-study. The adaptive noise cancellation system is designed. The system can improve LMS algorithm slow convergence speed and extraction of narrow band signal faults and has small amount of calculation and real-time good characteristic. The effect is better at Using this system in the field of life characteristic signal detection identification. Results show that the system has the high feasibility and validity.
Health Inspection System of Bridge and Tunnel Structure of Urban Railway Transit Based on RFID Technology
Authors: Zhao Xiao Yan , Yang Yuan Wei
Published: February 2011

RFID technology is an untouched automatic identification technology, which can identify object automatically and acquire the relative data. It has the advantages of needing no manly intervention and being able to work in severe environment. Thus RFID technology has been used in many fields such as mechanics, material flow, electric power system etc. Although in-situ structure health monitoring has been researched almost forty years, many important problems have not been resolved, such as position identification of damage occurring in large scale structure, pre-evaluation of civil structure usage lifespan, etc. And also there are quantities of structure parameters which can not be acquired through in-situ health monitoring technology. Especially for the long span urban evaluated bridges and tunnels, the advantage of in-situ health monitoring is less obviously. In some means, manly structure inspection is the sufficiently supplement to in-situ health monitoring technology. Therefore, in this paper, a new urban railway structure inspection system is developed by adopting RFID system and personal digital assistant.
Analysis of Cutter Offset Function in NC Lathe and its Applications
Authors: Yuan Feng , Wang Zhi Ping
Published: February 2011

The concept and usage of cutter offset compensation was introduced, and the cutter wear compensation and cutter radius compensation were calculated. The processing error produced by tool corner radius was analyzed, and the function, application occasion and usage of radius compensation in CNC lathe cutter is discussed, which has special significance for the accurate machining. The examples are given to illustrate how to using methods and skills in NC turning programming reasonably.
Applications of R Parameter and Programming Jump Instructions in SIEMENS System
Authors: Wang Zhi Ping , Yuan Feng
Published: February 2011

R Parameter programming and Programming Jump instruction is an advanced programming method in SIEMENS system and similar to the macro program in FANUC system. It uses parameter variables instead of functional codes and address values to make up a processing program. The R variables can plus, minus, multiply, divide, evolution, power, trigonometricfunction and so on in the logical calculation, In NC machining programming, uses R Parameter programming and is Programming Jump instruction, may realize the NC procedure logical judgment, comparison, transfer and other logic operation, resulting in a greatly simplified program, provides some solutions to numerical control programming for some special, complex and the similar parts.
Deploying Impact Dynamics Simulation on Deployable Mechanism of Folding Wing with Clearance
Authors: Hu Ming , Zhang Miao Miao , Chen Wen Hua , Jin Yong Ping , Xu Guo Ming , Qian Ping , Pan Jun
Published: February 2011

Based on the non-linear equivalent spring-damper model in the "two-state model", Impact model with hinge clearance for deployable mechanism of folding wing is set up and deploying dynamics on deployable mechanism of folding wing is simulated including impact force variation caused by the size of clearance and the clearance friction by using ADAMS software. The results show that the random continuous impact force is produced by the influence of clearance; as dimensions of the clearance increase, impact times decrease and amplitudes of impact forces are increased; System energy consumption is speeded up and to some extent times of impacts with clearance and disturbance effects of deployable mechanism is suppressed by friction in the whole deployable process.
Study on NC Instruction Interpretations Algorithm with High-Order Differentiability Based on Moving-Average
Authors: Song Fang , Hao Shuang Hui , Hao Ming Hui
Published: February 2011

During trajectory planning, position, velocity and acceleration should satisfy the boundary condition simultaneously, if the interpolation cycle was directly used to discrete velocity, precision loss will occur. In order to solve these problems, a novel double acceleration control algorithm in the deceleration phase is presented and used to deal with linear acc/dec control, based on which a moving-average acc/dec control algorithm is studied, this algorithm can not only meet requirement for velocity and acceleration smooth control, but also realize NC instruction interpretation with high-order differentiability. The simulation results demonstrate that the proposed algorithm is reasonable.
Bacterial Particle Swarm Optimization Algorithm
Authors: Li Ming , Ji Xue Ling
Published: February 2011

The loss of the population diversity leads to the premature convergence in existing particle swarm optimization(PSO) algorithm. In order to solve this problem, a novel version of PSO algorithm called bacterial PSO(BacPSO), was proposed in this paper. In the new algorithm, the individuals were replaced by bacterial, and a new evolutionary mechanism was designed by the basic law of evolution of bacterial colony. Such evolutionary mechanism also generated a new natural termination criterion. Propagation and death operators were used to keep the population diversity of BacPSO. The simulation results show that BacPSO algorithm not only significantly improves convergence speed ,but also can converge to the global optimum.
Online DC Voltage Measurement by Using DC-to-DC Converters
Authors: Ni Jin Long , Zhu An Ding
Published: February 2011

In order to measure the terminal voltage of a lead-acid battery online, a DC-to-DC converter – MC34063 is used to convert the D.C. input voltage to the supply voltage of measurement circuit. A three-terminal adjustable regulator of TL431A is used to generate a standard reference voltage for the A/D converter of the Microchip MCU – PIC16F873A. This D.C. voltage meter takes advantage of high accuracy of measurement and high stability.
An Optimal Quality of Service Routing Model for Multicast Network
Authors: Feng Shao Wei , Zhang Jing , Wang Rui
Published: February 2011

The QoS requirement of a connection is given as a set of constraints, which can be link constraints, path constraints, or tree constraints. A feasible path (tree) is one that has sufficient residual resources to satisfy the QoS constraints of a connection. In this solution some complicated constraint are relaxed and the primal problem is decomposed into several sub problems. Primal feasible solutions are obtained by some heuristics and a link set adjusting method is proposed by the aggregate flow on links. In computational experiments, the proposed algorithm determines solutions that are within a few percent of an optimal solution with 30 nodes in the QoS model. In terms of performance, our solution has more significant improvement than simple heuristics. The improvement on the total revenue can reach 12% on the average in the QoS model. The improvement of heuristics 2 in the QoS model on the total revenue can reach 8% on the average.
Optimal Channel Assignment Algorithm for Wireless Networks
Authors: Zeng Bin , Zhang Jing , Liu Hai Qing
Published: February 2011

In wireless cellular network, users will share the time-slots channel and bandwidth with voice users. With the characteristic of dynamic slot allocation, some time slots can be allocated to one single user. How to choose the slot allocation methodology is a significant problem when considering the system revenue and users’ satisfaction. A new model based on improvement of Markov Decision Process) is developed that can combines the original maximum system revenue model and the call blocking constraints, and will find out the optimal policy of time slots allocation. The experiment result shows that the new algorithm and model is efficient in the channel assignment area of wireless networks.
Photocatalytic Degradation of C.I. Reactive Red 2 on the Mixture of TiO2 and HZSM-5 Zeolite
Authors: Li Li , Yang Bo , Zhang Wen Jie
Published: February 2011

A mixture of TiO2 and HZSM-5 zeolite was used for photocatalytic degradation of an azo dye, C.I. Reactive Red 2(RR2). The adsorption of RR2 on TiO2 and the effect of TiO2 concentration were studied. HZSM-5 addition was also investigated to ascertain the function of the zeolite on RR2 decoloration. The results show that, the azo dye is quite stable under exposure of UV-C light. Less than 1.7% of the dye was adsorbed on TiO2 surface and 20 min was needed to reach dye adsorption equilibrium. The optimum TiO2 concentration was 320 mg/l. RR2 adsorption rate increased to more than 40% when HZSM-5 addition amount increased to 0.6 g in the solution. The total decoloration rate increased with the addition of HZSM-5 although zeolite addition could not enhance photocatalytic activity of TiO2.
Improvement of Hydrophilic Properties on Electrospun Polyacrylonitrile Fabrics Surface by Plasma Treatment
Authors: Thongphud A. , Visal-athaphand P. , Supaphol Pitt , Paosawatyanyong Boonchoat
Published: February 2011

Electrospun polyacrylonitrile (PAN) fabrics were prepared by electrospinning with 7%w/v concentration to dissolve in dimethylformamide (DMF) and spinning time 12 h. Radio frequency inductively couple plasma (RF-ICP) at 13.56 MHz were used to improve PAN fabrics surface by O2 gas in plasma treatment that became to hydrophilic properties of PAN fabrics surface. Physical properties were determined by scanning electron microscopy (SEM) and contact angle measurement which found that characterized on PAN fabrics surface after plasma treatment with increased treated time had been damaged on these fabrics surface which measured contact angle measurement with water were range 29.3 to 74.7. Chemical properties were analysed by fourier transform infrared spectroscopy (FTIR) that had been found peak intensities of aliphatic C-H band at 1450 and 2930 cm-1 and peak intensities of cyclic C=O bands at 1732 cm-1 and peak intensities of saturated nitriles at 2243 cm-1 and peak intensities of hydroxyl O-H band at 3600-3650 cm-1.
Modeling and Analysis of Effect of Thermal Exposure on Fatigue Crack Growth of Al-Cu-Mg Alloys with Low Cu/Mg Ratio
Authors: Hou Yan Hui , Liu Zhi Yi , Liu Yan Bin
Published: February 2011

Effect of thermal exposure on FCG of Al-Cu-Mg alloys with low Cu/Mg ratio in artificial and natural ageing conditions were modeled and analyzed. Three FCG rate models, namely Collipriest, Priddle, and Modified Forman model were examined to research the effect of thermal exposure on FCG of Al-Cu-Mg alloys with low Cu/Mg ratio in artificial and natural ageing conditions. The results showed that Priddle model provided the best fit. Priddle model was used to fit FCG data of (a) 170°C/30min ageing; (b)170°C/30min ageing +100°C/2000h exposure; (c)T351 ageing+100°C/2000h exposure; (d)T351 ageing. The fitted results indicated that the FCP resistance can be increased by slight artificial aging, and artificial aging can delay the degradation of the fatigue properties
A Study of Creative Artworks of Picture Books with Tableware Colored Using Mixed Media
Authors: Lin Rui Lin
Published: February 2011

The purpose of this study is to complete the creative artworks colored using mixed media for the picture books which come as free gifts with the children’s tableware by cooperating with companies in central Taiwan. The personification method was applied to the story marketing design to create a leading character, Baby Cow, with western imagery and eastern quality. The pictures were drawn by hands because it is warm and may imply children’s healthy and vigorous qualities. The design also focuses on several good friends of the leading character, with season changes and corresponding outdoor activities. Moreover, the researcher asked a class teacher from a technology university to guide her students from the design department to make their creative artworks for picture books through group discussions. The results of their designs not only solved the companies’ designing problem but also met the expected goal. And students were able to get to know the industry earlier. The purpose of combining practices with theories for curriculum learning was achieved. And the teacher had learned more about the practical aspect, which helped to improve her professional knowledge.
Project of High-Speed Railway and Sustainable Development Evaluating
Authors: Liu Lin , Liu Wei
Published: February 2011

This paper presents an evaluating method to optimize the sustainable development of high-speed railway (HSR). HSR is a quickly expanding business in China and without exception it has both advantages and disadvantages. There are many factors, such as planning, design, construction, operation, consumer utilities, public participation, environmental protection, economic analysis, influencing the sustainable development of HSR. Aiming at the main factors influencing it, a series of indices are picked up and the evaluating method is established which is based on the grey relational analysis (GRA). By using this index, the closest to the best sustainable development state is selected in similarity HSRs. The result shows that the evaluation method based on GRA is simple and scientific and has a potential prospect. The major contribution of this research lies in developing a formal evaluation framework for the sustainable development of HSR and providing useful managerial insights.
Effect of Sm2O3 on the Electrical Properties of TiO2-Ta2O5-Based Capacitor-Varistor Ceramics
Authors: Wang Tian Guo , Qin Qun , Zhou Dong Jian
Published: February 2011

TiO2 ceramics doped with 0.1 mol% Ta2O5 and different concentrations of rare earth oxide Sm2O3 were obtained by sintering at 1450 °C. As a varisor material, the microstructure, the nonlinear electrical behavior and dielectric properties of these ceramics were investigated. SEM and XRD were carried out to study the change of microstructure. The results show that there exist second phase (Sm2Ti2O3) on the surface on the surface of TiO2 grains. The ceramics have nonlinear coefficients of α = 2.0-4.0 and ultrahigh relative dielectric constants which is up to 104. The sample doped with 0.5 mol% Sm2O3 exhibits high nonlinear constant of 3.7, low breakdown voltage of 21.5 v/mm, ultrahigh electrical permittivity of 4.25× 104 and low tanδ of 0.37. It is suggested that the sample doped with 0.5 mol% Sm2O3 forms the most effective boundary barrier layer. The defects theory was introduced to illustrate the nonlinear electrical behavior of TiO2-Ta2O5-Sm2O3 varistor ceramics.
Epipolar Geometry Estimation Using Improved LO-RANSAC
Authors: Zhou Jun
Published: February 2011

The estimation of the epipolar geometry is of great interest for a number of computer vision and robotics tasks, and which is especially difficult when the putative correspondences include a low percentage of inliers correspondences or a large subset of the inliers is consistent with a degenerate configuration of the epipolar geometry that is totally incorrect. The Random Sample Consensus (RANSAC) algorithm is a popular tool for robust estimation, primarily due to its ability to tolerate a tremendous fraction of outliers. In this paper, we propose an approach for improve of locally optimized RANSAC (LO-RANSAC) that has the benefit of offering fast and accurate RANSAC. The resulting algorithm when tested on real images with or without degenerate configurations gives quality estimations and achieves significant speedups compared to the LO-RANSAC algorithms.
Air Flow in Large Space Building with CFD Model and Local Test
Authors: Wang Jun , Wang Hai Xia
Published: February 2011

Simulation with CFD and local test are two main methods in study on air flow in large space building. This paper tests and simulates thermal comfort and air distribution of existing air- conditioning mode of some exhibition center. Through comparison and analysis on existing and simulated air-conditioning pattern, draw a conclusion that it’s feasible to simulate thermal comfort and air distribution of air-conditioning. And the research is important to guide energy efficiency and design optimization of air-conditioning system in large space building.
The Exact Deformation Theory of Two-Dimensional Dodecagonal Quasicrystal Shaft
Authors: Zhao Bao Sheng , Zhao Ying Tao , Gao Yang
Published: February 2011

Cheng’s refined theory is extended to investigate torsional circular shaft of two-dimensional dodecagonal quasicrystal (2D dodecagonal QCs), and Lur’e method about harmonic function is extended to harmonic function in the respective cylindrical coordinate. The exact deformation of torsional circular shaft of 2D dodecagonal QCs under reverse direction surface loading is proposed on the basis of the classical elasticity theory and stress-displacement relations of 2D dodecagonal QCs, and the exact deformation theory provides the solutions about torsional deformation of a circular shaft without ad hoc assumptions. Exact solutions are obtained for circular shaft from boundary conditions. Using Taylor series of the Bessel functions and then dropping all the terms associated with the higher-order terms, we obtain the approximate expressions for circular shaft of 2D dodecagonal QCs under reverse direction surface. To illustrate the application of the theory developed, one example is examined.
Defect Inspection and Classification of CFRP with Complex Surface by Ultrasonic
Authors: Li Xiong Bing , Hu Hong Wei , Li Ling , Tong Lin Jin
Published: February 2011

In this paper, we address the problem of automatic inspection of CFRP with complex surface using an ultrasonic technique. The 3D surface data are obtained by ultrasonic measurement, and then the inspection path is planned after the CAD model has been reconstructed. Defect position and size are figured out by analyzing C-Scan image. Characters of defect type are modeling according to A-wave data. Thereafter, an algorithm based on Multi-SVM is presented to classify defect types which use the energy character of defect dynamic waveform. Finally, application experiments are conducted to verify the validity and superiority of the method proposed in this paper.
Study on the Effect of Waste Gypsum on Hardening Paste Structure and Performances of Lime-Fly Ash
Authors: Sun Jia Ying , Xu Yi Dong
Published: February 2011

Based on the experiments, the effect of waste gypsum on the formation of paste structure, the early strength and the stability of lime-fly ash is discussed in the article. As is shown by the results, the early strength of paste was improved by adding waste gypsum into lime-fly ash. The stability of lime-fly ash paste modified by waste gypsum could meet technical requirements when waste gypsum admixture was less than 40%. With the increase of hydration age, the number of ettringite (AFt) and C-S-H gel in paste would increase.
The Influence of Air Humidity on Fatigue Properties of an AA2524－T34 Aluminum Alloy
Authors: Li Tang , Tao Jun Lin , Wang Qing Yuan
Published: February 2011

Self-aligning four-point bend fatigue tests were conducted to investigate the influence of humid air on the fatigue behavior of an AA2524-T34 Al alloy. Test specimens of the alloy along the rolling direction was cycled at room temperature and frequency of 15 Hz, tension-tension loading(R = 0.1), in 15% relative humidity (RH) and 95% RH up to 107 cycles to failure. The S-N data shows continuous reduction tendency. It was found that with the increase of test relative humidity, the fatigue properties of the alloy is decreased, the fatigue limit in 95% RH was nearly 20% reduction of that in 15% RH, only 67% of its yield strength. Meanwhile, the S-N data is much more scattered than it in lower relative humidity. In 15% and 95% RH, cracks were initiated predominantly at coarse particles but partly at grain boundaries on the surface in 95%RH. SEM results show the characteristics of intergranular fracture in high humidity circumstance.
Trim Optimizations of an Adaptive Tailless Aircraft with Composite Wing
Authors: Xie Jiang , Yang Zhi Chun , Guo Shi Jun
Published: February 2011

This paper investigates aeroelastic tailoring and optimal trailing edge control surface deflection to minimize induced drag for a HALE UAV flying wing configuration. The analysis process is conducted on the Finite Element(FE) model of a composite slender wing. Genetic Algorithm(GA) is employed to aeroelastically tailor the wing by setting the composite ply orientation. The study examined conformal and traditional flaps and explored two optimization formulations to minimize drag. The impacts of the conformal control surface are recognized as required deflection saving which can be translated to drag reduction. The results also show that the control demands for the optimal trim can be further reduced if the wing is properly tailored.
GetCM: A Vision of Cloud Manufacturing
Authors: Zhou Jing Tao , Yang Hai Cheng , Wang Ming Wei , Jing Shi Kai , Mo Rong
Published: February 2011

Surviving in an increasing globalization, distribution and flexibility environment, modern manufacturing requires an extremely flexible, self-adaptive foundation capable of dynamic provisioning, coordinating and using infinite manufacturing resources available on demand over large-scale computer networks. In contrast to the conventional networked manufacturing approach, the cloud manufacturing vision (GetCM) introduced in this paper promises elasticity, flexibility and adaptability through the on-demand provisioning of manufacturing resources as a utility by reflecting the basic principles of cloud computing. The discussion is made from technological, functional, economic aspects to provide evidence of the benefits from GetCM in the context of networked manufacturing resource access, provision, sharing and coordination. A primary architecture for GetCM is introduced based on the analysis of key criteria in realizing the vision of a function for cloud manufacturing. Focuses of this paper are placed on the vision and the outline of GetCM architecture.
Performance Study of SMPS and FDMA for Nanometer Aerosol Particle Measurements
Authors: Chang Chang Tang , Ma Chih Ming , Hong Gui Bing , Huang Ham Sun , Chen Da Ren
Published: February 2011

A new method of Differential Mobility Analyzer (DMA) operation using a Fast Scanning Differential Mobility Analyzer (FDMA) nanometer particle sizer has been implemented. By optimizing the flow and voltage ramps, improvements can be made in the FDMA's measurement size range, counting statistics and resolution. In this study, an electrostatic classifier was used to generate mono-dispersed particles of different sizes to calibrate the delay time of the FDMA. The aerosol from incense combustion could be measured directly by FDMA although the particulate concentration was as high as 1,011 particles cm-3. The resolution of the FDMA was 3 nm and better than the SMPS (10nm).
Linear Static Response of Suspension Arm Based on Artificial Neural Network Technique
Authors: Rahman M.M. , Mohyaldeen Hemin M. , Noor M.M. , Kadirgama K. , Bakar Rosli A.
Published: February 2011

Modeling and simulation are indispensable when dealing with complex engineering systems. This study deals with intelligent techniques modeling for linear response of suspension arm. The finite element analysis and Radial Basis Function Neural Network (RBFNN) technique is used to predict the response of suspension arm. The linear static analysis was performed utilizing the finite element analysis code. The neural network model has 3 inputs representing the load, mesh size and material while 4 output representing the maximum displacement, maximum Principal stress, von Mises and Tresca. Finally, regression analysis between finite element results and values predicted by the neural network model was made. It can be seen that the RBFNN proposed approach was found to be highly effective with least error in identification of stress-displacement of suspension arm. Simulated results show that RBF can be very successively used for reduction of the effort and time required to predict the stress-displacement response of suspension arm as FE methods usually deal with only a single problem for each run.
The Mechanical Feature and Dependence of the pH-Sensitive Hydrogel
Authors: Zhu Xiu Fang , Yang Ming , Zhang Hong Xia , Nie Yu Jing
Published: February 2011

Tensile tests were conducted on poly (AAc-co-AAm) hydrogel sensitive to variations in environmental pH and ionic strength. Mechanical properties (Young’s modulus) were determined at different levels of swelling equilibrium. The results show that there are great shift in the modulus number between the swollen and unswollen states, corresponding to the maximum, the Young’s modulus data in the pH7 buffers is a decrease of 80%. The Poisson’s ratio of the samples tested in the pH2 with 1.0M ionic strength solution is nearly 0.5, which implying its incompressibility. Analyzing its inner structure, the reason may be the high polymer chains entangled highly, they can resist the deformation. The further investigations of SEM micrographs prove our suggestions about the microstructure change.
First Principles Calculation of Geometrical and Electronic Structure of Semiconductor Fe1-xMnxSi2
Authors: Gui Fang , Zhou Shi Yun , Yan Wan Jun , Zhang Chun Hong , Guo Xiao Tian , Yang Yong
Published: February 2011

The electronic structure and optical properties of Fe1-xMnxSi2 have been studied using the first principle plane-wave pseudo-potential based on the density function theory. Substitutional doping is considered with Mn concentrations of x=0.0625, 0.125, 0.1875 and 0.25, respectively. The calculated results show that the volume of β-FeSi2 increase and the band gap increase with increasing of Mn.
The Determination of Prestress for Reinforced Concrete Pipes Based on Elasticity
Authors: He Rong , He Wei , Zheng Heng Xiang
Published: February 2011

Based on elasticity, an elastic model was used to derivate the stress function and the stress expressions. According to the stress boundary condition and the geometry dimension of a cylinder-cross-section pipe, the constants are determined. First supposed the pipe were empty and the inner pressure were zero, the maximum prestress for the reinforced concrete pipe was determinate. Second, supposed the liquid pressure was the maximum, the model was used to determinate the minimum prestress. Combined the two critical conditions, the reasonable range of prestress for reinforced concrete pipe was got. In designing, the prestress must be consistent with it to prevent the concrete from crushing or bursting. At last, some differences between the theory result and the fact were pointed out to guide the application of the model.
Effect of Different Silicon Sources on CO2 Absorption Properties of Li4SiO4 at High Temperature
Authors: Shan Shao Yun , Jia Qing Ming , Jiang Li Hong , Wang Ya Ming
Published: February 2011

Using cheap and porous diatomite or zeolite as silicon sources, we prepared firstly Li4SiO4 matetials for high temperature CO2 capture through solid-state method, and mainly investigated effects of silicon sources on the CO2 absorption properties of Li4SiO4 materials. Phase composition was analyzed by X-ray diffraction, and the CO2 absorption properties were studied by the simultaneous thermal thermogravimetric analyzer (TG-DSC). The results showed that Li4SiO4 materials using zeolite as silicon source showed little CO2 absorption properties, while Li4SiO4 materials using diatomite as silicon source showed excellent CO2 absorption properties. Compared with the existing literatures, the preparation cost of Li4SiO4 materials was lowered
Effects of Plasma Nitriding on Low Temperature Salt-Bath Chromizing of W18Cr4V Steel
Authors: Ye Jin Ling , Ye Feng
Published: February 2011

Effects of plasma nitriding on low temperature salt-bath chromizing of W18Cr4V steel is studied .The chromizing process is investigated by means of optical microscopy(OM), scanning electron microscopy(SEM), X-ray diffraction (XRD). Results show that the specimens are chromized successfully by low temperature salt-bath subjected to plasma nitriding. A chromized layer with average 3.3μm in thickness and 1200HV-1300HV in microhardness is formed on the substrate by chromizing at 610°C for 6h. XRD analysis show that the chromized layer is composed of Cr23C6, CrN, Cr/Fe, (Cr, Fe)7C3 , (Cr, Fe)2N and the surface chromium concentration reaches 77.67%.
Experimental Study on RC Beams Strengthened with CFRP Sheets
Authors: Dong Jiang Feng , Wang Qing Yuan , Qiu Ci Chang , He Dong
Published: February 2011

This paper presents the flexural performance of reinforced concrete (RC) beams with rectangular section. Seven RC beams strengthened using carbon fiber reinforced polymer (CFRP) sheets were subjected to four-point bending to investigate the effect of fiber reinforcement on the beams strengthened. The main experimental parameters included in the study are the pre-cracked width, CFRP sheet layers, the longitudinal tensile reinforcement ratio, the shear span ratio, and the concrete cover thickness. In total, seven beams were cast, one beam without any reinforcement as a control beam, two beams strengthened by CFRP sheets without making pre-cracks on the beam and four pre-cracked beams repaired with one layer or two layers CFRP sheets. Test results show the effectiveness and flexural capacity of the CFRP strengthened beams. The flexure enhancement of the CFRP strengthened beams varied between 41.7% and 124.1% over the control beam. This study confirms that the CFRP reinforcing technique significantly enhances the flexural capacity of reinforced concrete beams.
Catalyst Study for Carbon Nanotubes Synthesis by Flame
Authors: Guo Yong Hong , Sun Bao Min , Ding Zhao Yong , Bi Jin Sheng , Jia Bin
Published: February 2011

Flame offer potential for synthesis of carbon nanotubes in large quantities at significantly lower cost than that of other methods currently available. Catalyst can decide the produces category, structure, capability, etc. This study aimed to examine catalyst for carbon nanotubes synthesis. In this experimental, oxy-acetylene flame is used as the source of heat, and CO as the source of carbon. Nebulized Fe(CO)5 as catalyst gets straight, uniform, and long tubes while coated iron-aluminum compound as catalyst gets nanoparticles coated tubes, although these tubes are thin, long, and straight. Coated Fe(CO)5 as catalyst only can gets curly and short tubes, directly introduced into synthetic chamber gets particles, and Fe2O3 powder as catalyst mainly gets curly tubes. Although the tubes which iron-aluminum compound as catalyst are high capability, they must be purified before use while Fe(CO)5 as catalyst can gets smooth tubes.
Effects of Temperature for Carbon Nanotubes Synthesis
Authors: Ding Zhao Yong , Sun Bao Min , Guo Yong Hong , Jia Bin , Bi Jin Sheng
Published: February 2011

Pyramid sharp pyrolysis flame is a new method for carbon nanotubes synthesis. Oxy-acetylene flame outside the frustum of pyramid sharp reactor provides the necessary high temperature circumstance for carbon nanotubes synthesis, while inside the interior mixture of CO, H2, He, and iron pentacarbonyl (Fe(CO)5) is heated. CO is used as the source of carbon, Fe(CO)5 as the source of catalyst precursor. Special structure of the frustum of pyramid sharp reactor makes the oxy-acetylene flame folded gradually above the reactor. And it meets the condition that the interior mixture which has reacted initially under high temperature and will flow out of reactor avoids exposing to air completely and burning abundantly. Immersing a sampling substrate into the incomplete burning flame can gain carbon nanotubes. By adjusting the distance between the oxy-acetylene flame jet and the synthesis area, achieved the purpose that just changing one factor of synthesis or pyrolysis temperature while the other one constant, then respectively studied the effects of them on experimental. The perfect synthesis temperature in experimental is about 595°C, while the pyrolysis temperature is about 1000°C.
A First-Principles Study of Hydrogen Molecules Adsorption on Graphene
Authors: Roudi M. Johari , Mahmoodi T.
Published: February 2011

Graphene is a 2D lattice of Carbon atoms which has a high potential to use it for hydrogen storage. In this paper we have studied theoretically the adsorption of hydrogen molecules on a single-layer graphene and we obtained the adsorption energy including optimized position and orientation of the hydrogen molecule with respect to the graphene surface in different points of the graphene lattice. We have done our calculations using Quantum-ESPRESSO code and applying pseudo-potential method in the framework of Density Functional Theory (DFT). We have used Local Density Approximation (LDA) for exchange correlation energy. Our result shows that adsorption energy is increased with decreasing the density of . However the maximum adsorption energy is occurred on the hollow position and for the surface homogenous arrangement.
Design of Material Management System for Small-and-Medium-Sized Garment Enterprises
Authors: Yan Yi Nong
Published: February 2011

On the basis of theoretical research on what are mainly contained in material management for garment enterprises and subsequent to our survey to some small-and-medium-sized garment enterprises in China, this paper tries to propose some scientific material management modes for current production and material management system therein, based on which we have developed a corresponding management software. That software system may meet the current demands for information management for small-and-medium-sized garment enterprises, and lay a foundation for future implementation of ERP and ERP II.
Experimental Research on the Normal Absorption Coefficient of the Multilayer Material
Authors: Feng Tao , Liu Bin , Wang Jing , Wu Xue , Li Nan
Published: February 2011

The normal absorption coefficient of the multilayer material was studied in this research. A measurement duct system was established at first, and then the absorption coefficients of multilayer material with different structures were measured through this experimental system. Some conclusions could be drawn: Compared with the uniform material, the multiple layer material can change the absorption coefficient significantly without increasing the thickness of the material in low frequency band. The position and the area density of the aluminum plate can both change the absorption coefficient significantly. The frequency corresponding to the absorbing peak value decreases with the increasing of the area density of aluminum plate. The absorption coefficient becomes larger near to one in low frequency band and in the meantime changes lower than 0.1 in the high frequency band. The position and area density of the aluminum plate can be designed to satisfy the requirements of the sound absorption.
Industrial Diversification and Regional Development Stability: Theoretical Discussion
Authors: Lei Li
Published: February 2011

The effect of economic diversification on regional economic development has received considerable attention from regional scientists and a number of themes have emerged in recent literature. It is widely believed that fluctuations in regional employment and economic growth can be reduced by increasing the diversity of the economic base of the region. Several approaches have been developed to measure regional economic diversity.
A Multi-Dimension Configuration Method of Modular Machine Tools Based on Customer Requirements-Driven
Authors: Zhao Li Ping , Yao Yi Yong , Nie Qing Feng
Published: February 2011

Based on customer requirements-driven, a multi-dimension configuration for modular machine tools was proposed. The method comprehensively employed QFD and rule-based reasoning to work out the mapping between customer requirements and product attributes and identify the optimal values of technical requirements. Finally, taken cost and delivery time as optimal objects, the proposed method was verified by a case of machine tools.
Design and Implementation of Boot Loader Based on Embedded System Platform
Authors: Wang Lu Feng
Published: February 2011

the embedded products with representatives of information appliances for the Internet era has demonstrated good prospects for the embedded market, but also brought new and higher challenges to the embedded system technology, including hardware and software technologies. This paper uses BF531 processor as the example, focuses on its startup mode and flow, and then based on this designs and implements a tailor made Boot Loader, to complete BF531 processor initialization, loading, starting the operating system kernel, and other works.
Analysis for Diving Regulator of Manufacturing Process
Authors: Wang Jung Chang , Tsai Yu Pin
Published: February 2011

Diving regulator converts the compressed air in a tank into atmosphere air for divers and plays a very important role of SCUBA diving apparatus. The article analyzes its manufacturing process of injection mold in order to enhance the strength after insert molding through the good thermal performance of vapor chamber. The insert molding process is that the metal insert is firstly put into the cavity and then composed an embedded metal-plastic product by injection molding. These results proved that the product strength can be improved significantly with a yield rate up to 100% through this manufacturing process.
The Refined Analysis about Mechanical Behavior for Torsional Circular Shaft of Cubic Quasicrystal
Authors: Zhao Bao Sheng , Gao Yang , Zhao Ying Tao
Published: February 2011

Cheng’s refined theory is extended to investigate torsional circular shaft of cubic quasicrystal, and Lur’e method about harmonic function is extended to harmonic function in the respective cylindrical coordinate. The refined theory of torsional circular shaft of cubic quasicrystal under reverse direction surface loading is proposed on the basis of the classical elasticity theory and stress-displacement relations of cubic quasicrystal, and the refined theory provides the solutions about torsional deformation of a circular shaft without ad hoc assumptions. Exact solutions are obtained for circular shaft from boundary conditions. Using Taylor series of the Bessel functions and then dropping all the terms associated with the higher-order terms, we obtain the approximate expressions for circular shaft of cubic quasicrystal under reverse direction surface. To illustrate the application of the theory developed, one example is examined.
Numerical Simulation on Bending Characteristics of Aluminium Foam Filled Thin-Walled Tubes
Authors: Wang Qing Chun , Niu Hao Long , Wang Guo Quan , Wang Yu Xin
Published: February 2011

Different aluminum foam filling lengths were used to increase the bending energy absorbing capacity of the popularly used hat sections. Bending energy-absorption performance of the thin-walled tubes was numerically studied by explicit non-linear software LS-Dyna. First empty hat section subjected to quasi-static bending crushing was simulated, then structures with different aluminium foam filling lengths were calculated, finally energy absorption capacity of these structures were compared. Calculation results showed that, the internal energy absorbed and mass specific energy absorption capacity of foam filled thin walled structures were increased significantly compared to the empty sections. The reason of the improvement was mainly due to the contact of the aluminium foam and the structure. Aluminium foam filling is a promising method for improving lateral energy absorbing capacity of thin-walled sections.
Fabrication and Gas-Sensing Characterization of Molybdenum Oxide Nanostructure by Reactive RF Sputtering
Authors: Oros C. , Wisitsoraat Anurat , Phokharatkul D. , Limsuwan Pichet , Tuantranont Adisorn
Published: February 2011

Molybdenum oxide (MoOx) is an interesting metal oxide with promising properties for applications in the field of catalysts and chemical sensors. Its characteristics could be significantly enhanced by forming nanostructures. Recently, MoOx nanostructures, including nanobelt and nanorod prepared by thermal evaporation, chemical syntheses and sputtering have been reported. Sputtering is a practical method for MoOx nanostructure synthesis because it is a low temperature, well-controlled and IC-compatible process. However, the structure of MoOx material prepared by sputtering techniques is strongly depending process condition and thus far there has been no systematic investigation of the sputtering parameters on MoOx structure. In this work, suitable sputtering conditions for the formation MoOx nanostructures are studied and the MoOx thin films prepared under different condition are tested toward ethanol, acetone gas sensing. Sputtering pressure, radio frequency (rf) power and argon to oxygen flow ratio are systematically varied in the range of 2x10-3- 8x 10-3 mbar, 200 W and 1:2 to 1:4, respectively. It was found that molybdenum oxide nano-needle tend to form at high argon to oxygen ratio of 1:4 and rf power 200 W. Under these conditions, MoOx nano-needles are formed with different length ranging from 0.2-0.5 um. In addition, MoOx nano-needles are highly crystalline with MoO3 Orthorhombic crystal phase. Gas-sensing performances of sputtered molybdenum oxide nano-needle thin film have been characterized toward ethanol and acetone sensing. It was found that molybdenum oxide thin films exhibit n-type conductivity with decreased resistance when exposed to ethanol and acetone, which are reducing gases. In addition, the molybdenum oxide thin films are capable of detecting ethanol and acetone gases at concentrations lower than 100 and 200 ppm, respectively at operating temperature 400 °C.