bluuebunny/crossref_metadata_2025 huggingface dataset:
The Effect of Oxide Fixed Charge on the Breakdown Characteristics of SiC Lateral Super Junction Devices
Authors: Jia Hu Jun , Zhou Guo Dan , Yang Yin Tang , Duan Bao Xing
Published: October 2011

In this paper, the positive and negative effects of oxide fixed charge on the breakdown characteristic of lateral SiC super junction devices are studied. Simulation results show that in the super junction devices with oxide layer, the negative (or positive) fixed charge on the SiO2/SiC interface act as a like p-pillar (or n-pillar) and enhance the depletion of n-pillar (or p-pillar), which result in a charge compensation and improvement of the breakdown characteristics of the devices. At the same time, a phenomenon of electric field crowding can be caused by the fixed charge and result in a decreasing of the breakdown voltage, this negative effect can be suppressed sufficiently by a field plate.
Development of Processing Machine for Convex Curved Rake Face of Pinion Cutter
Authors: Li Xue Guang , Zhang Shu Ren , Shi Guo Quan , Song Lin Sen
Published: October 2011

According to the new profiling characteristic of carbide pinion cutter with convex curved rake face, the verifying experiment for principle of processing method is done on the four axis vertical processing center. According to the experiment result, special machining equipment of convex curved rake face of pinion cutter is designed and developed, position of each axis and motion relationship is ascertained, tool path position of CNC machining is solved, path fitting of grinding wheel machining is done, machining experiment of pinion cutter with convex curved rake face is done by using the developed processing machine, The experiment result shows that the designed machining method and developed machine are proper for machining requirements, changed tendency curve of surface roughness is obtained, the range of cutting parameters is ascertained for getting better surface roughness.
Research of Magnetorheological Digital Flow Control Valve
Authors: Wang Qing Hui , Wu Zhang Yong , Wang Jing Tao , Duan Zhen Hua , Wu Xi , Wen Cheng Zhuo
Published: October 2011

A magnetorheological digital flow control valve is designed using magnetorheological fluid (MRF) magnetorheological characteristics. The paper gives the magnetorheological digital flow control valve’s structure and mathematical model, and according to the working condition, proposes using the pulse width modulation (PWM) control mode which is one of the digital valve control modes to realize the flow control. Simulation analysis has been done and the results show that the magnetorheological digital flow control valve has good static performance, high frequency switching speed and response，easy to realize intelligent control.
Weld Quality Improvement with Hybrid FSW Technology Assisted by Preheating for Copper T2/Aluminium 5A06 Dissimilar Materials
Authors: Zhao Xin , Dong Feng Bo , Su Guo You , Guo Li Jie
Published: October 2011

Copper and aluminium alloy could be welded by friction stir welding (FSW) but it is quite difficult to achieve a defect-free welding joint for welding dissimilar materials because of the enormous difference of their thermo-physical performances. In this paper, another friction stir tool was applied as a heating source to preheat the copper side to 150~200°C in the welding direction. Preheating temperature can make up the lost heat, improve the temperature of copper plate before the FSW process, achieve the refining grains, and then obtain a high quality welding joint. We concentrated on hybrid heat-source equipments design and procedure optimization in our studies. The microstructure, mechanical properties and phase constituents of FSW joints were studied through mechanical test and metallographic analysis. The results indicated that the hybrid FSW technology with preheating for copper T2/aluminium 5A06 dissimilar materials can not only improve the welding efficiency, but also obtain the high quality welding joint. This special welding technology could solve the welding problems of Al-Cu dissimilar materials and had a good potential for application in aerospace manufacturing.
Synthesis and Standard Molar Formation Enthalpy of Plate Shape NaZnPO4·H2O
Authors: Ma Shao Mei , Wu Sheng Fu , Huang Zeng Wei , Liao An Ping , Yuan Ai Qun
Published: October 2011

Plate shape NaZnPO4·H2O was synthesized by solid-state reaction at low temperature and characterized by X-Ray Diffraction, Scanning electron microscope and elemental analysis. Thermochemical study was performed with an isoperibol solution calorimeter. Based on Hess’s law, thermochemical cycl was designed to determine the dissolution enthalpies of reactants and products using a solution-reaction isoperibol calorimeter at 298.15 K, and the molar reaction enthalpy was calculated on the basis of above dissolution enthalpies. The results show that the obtained product is plate shape NaZnPO4·H2O. The standard molar formation enthalpy of the NaZnPO4·H2O is ΔfHm [NaZnPO4·H2O,s]= -1967.18 ± 0.69 kJ•mol-1.
Stress and Modal Analysis of Flat Spiral Spring in Elastic Energy Storage Equipment
Authors: Duan Wei , Feng Heng Chang
Published: October 2011

The energy storage technology is playing an important role in improving power grid stability. Aiming to the randomness and intermittent characteristics of wind power generation, the paper proposed a scheme of mechanical elastic storage energy and power generation system based on flat spiral spring. The flat spiral spring, which is the core component in the system, is selected as the research object, and the mechanical model and the finite element model is created. The geometric parameters of spring are determined. The maximum deformation and the stress distribution of spring are obtained. Moreover, the modal analysis of spring is carried out and the natural frequencies and modes of vibration of first 20 orders are obtained. The relationship between the natural frequency and deformation is also analyzed. All the results in this paper provide a strong basis for the optimization design of spring and the calculation of energy density.
A New Framework for Evaluation Index System of Regional Science and Technology
Authors: Yang Wen Ming , An Wei Jin
Published: October 2011

Based on the analysis of several main evaluation index systems of regional science and technology (S&T) progress in-country and overseas, and refer to the idea of system dynamics and balanced scorecard, this paper explored the causality and dynamical structure of subjective and factor in index systems of regional S&T progress, probed its rules and relationship. After examined and reconstruction the statistical monitoring index system of S&T progress designed by Ministry of S&T in China, this paper putted forward a new framework of evaluation index system of regional S&T progress.
Underwater Image Segmentation Combining Dual-Band Enhancing and Edge-Grouping
Authors: Zhao Kun , Xu Yi Ping , Peng Fu Yuan , Yang Guo Liang , Wang Xin Wei
Published: October 2011

In order to make segmentation more robust and accurate in the underwater environment, a two-stage segmentation method is proposed in this paper. In preprocessing stage, a dual-band enhancing technique is used to preserve the target contour and at the same time eliminate the fake edges generated by the noises; in segmentation stage, edge-grouping method is chosen for its advantageous characteristics over noisy images. Experimental results show that the proposed method can get a better performance both in stability and accuracy.
A Multi-Channel Audio Signal Processing Platform Based on DSP
Authors: Gao Jie , Wang Liang , Ma Jing Min
Published: October 2011

This paper presented a multi-channel audio signal processing platform based on TMS320VC5509A. It introduced the system basic circuit and the hardware interface design of TLV320AIC23B and TMS320VC5509A. The platform can achieve input four-channel signal and output four-channel simultaneously. Due to its low power consumption, high performance and portable feature, the platform has been used in the system of noise reduction headphone.
Hysteretic Nonlinear Model of Magnetic Shape Memory Alloy
Authors: Zhu Zhi Wen , Gao Liang , Xu Jia
Published: October 2011

In this paper, a kind of Magnetic Shape Memory Alloy (MSMA) model based on hysteretic nonlinear theory was developed. Von del Pol nonlinear difference item was introduced to interpret the hysteresis phenomenon of strain-magnetic field intensity (MFI) curve of MSMA. The final relationship among strain, stress and magnetic field intensity was obtained in partial least-square regression method to describe the variation of strain-MFI curve with stress. The result of forecast test shows that the model can describe the characteristics of MSMA in different stress well. The new MSMA model is easy to be analyzed in theory, which is helpful to application of MSMA in engineering fields.
Design of the Test Rig for Whole Hydraulic Support
Authors: Zhang Xin , Zang Meng , Cao Lian Min , Ding Ning
Published: October 2011

By the analysis of the development tendency and test standards requirements of high-level hydraulic support, this paper primarily determines the chief technical parameters and overall structure of the test rig for whole hydraulic support, and its 3-D model is built and assembly check is conducted by using SolidWorks. Then, the hydraulic control system and data acquisition system of the test rig are designed. In the end, the 3-D model of the test rig is imported into COSMOSWorks to accomplish the finite element analysis. According to analysis result, the strength of the test rig can meet the requirements, which ensures the design quality of the test rig for whole hydraulic support.
Making Decision for Sustainable Product Lifecycle: A Markov Decision Process Based Method
Authors: Wang Jun Feng , Wang Ning , Rao Jin Feng
Published: October 2011

As energy, resource and environmental issues become more and more serious, sustainable product attracts increasing attention. Products with short lifecycle, such as consumer electronics, gain particular concern. Authors formulate a sustainable product lifecycle evolution method based on Markov decision process. It was validated by an example that the method can select suitable phases at which company should invest money and resources.
Analysis of Nonlinear Model of Rock
Authors: Wen Zhi Jie , Qin Guang Peng , Pan Li You , Chen Lian Jun
Published: October 2011

By dint of nonlinear mechanics theory and method, and based on rock creep characters, do some analysis to the model of rock mechanics, so we can get conclusions and stability about rock system’s stationary state under the action of uniaxial compress. It has some directed senses to the underground rock project under mining effects.
The Ground Motion of Isosceles Triangular Hill in Right-Angle Plane Impacted by SH-Wave
Authors: Qi Hui , Guo Jing , Yang Jie
Published: October 2011

The analytical solution to the problem of the scattering of SH-wave by isosceles triangular hill in right-angle plane is given by using the methods of complex function and multiple coordinate. Firstly, the solution region is divided into two domains, where domain I involves isosceles triangular hill and a semi-circular bottom, domain II involves a semi-circular hollow in right-angle plane. And a standing wave function is constructed which satisfies the zero-stress conditions at the triangular wedges. In domain II, the scattering wave functions which satisfy the stress free boundary conditions at the free surfaces for the right-angle plane are constructed. Secondly, based on the conditions of the displacement continuity and stress continuity at the “common border” in the domains, a series of infinite algebraic equations are given and solved by truncation. Finally, some examples for amplitude of displacement on the surface are given. Numerical results show that amplitude of displacement on the surface is influenced by isosceles triangular hill.
Alumina-Zirconia-Silica Ceramics Synthesis by Selective Laser Sintering/Melting
Authors: Wang Wei , Liu Yong Xian , Fuh Jerry Y.H. , Wang Peng Jia
Published: October 2011

In this paper, the synthesis and investigation of the glass in the Al2O3- ZrO2-SiO2 system, to be used in dental field. The mechanism of powder–state becoming a solid state block during the laser sintering process was disclosed by scanning electron microscope (SEM) and energy dispersive X-ray (EDX) analysis on powders and sintered samples. The optimal parameters of laser and can be obtained by the study. The results allowed us to affirm that the characteristics of this glass, in comparison with the tooth hard substances and other commonly employed inorganic dental materials, recommend it for further utilization in the dental field.
A Research on the Fuzzy Control Strategy for Parallel Hybrid Electric Vehicle
Authors: Cai Ling , Ge Liang
Published: October 2011

Several kinds of methods of energy management of hybrid electric vehicle (HEV) are analyzed. Based on the design requirement of a certain type of parallel HEV, the fuzzy control strategy of energy management is proposed. ADVISOR2002 is chosen as the simulation platform for secondary development, and the simulation results of the fuzzy control strategy and electric assist control strategy are compared. The simulation results indicate that the adaptive fuzzy controller can obviously improve the performance of HEV fuel economy and emissions.
Application of a Measuring System for Visual Judgment Ability of Drivers in Real Three-Dimension Space
Authors: Xia Ru Ting , Doi Shun Ichi
Published: October 2011

This paper introduces the application method of a measuring system for visual judgment ability of drivers in real three-dimension space (3D) based on the visual attention theory. The measuring system can simulate the traffic environment and driving conditions, and is made up of five parts, signal display system, data recording system, traffic environment simulation system, experimental seat and computer control system. It can control the peripheral environment illuminance and the appearance of stimulus at the target locations, and change the colour of stimulus. The paper demonstrated that the measuring system can be used to examine the reaction time and judgment response of drivers in real three-dimension space during driving, and show that the response ability training for visual attention of drivers can improve the vision judgment ability.
Assessment of Urban River Eco-Security: An Integrated Index and Forecast Modeling System
Authors: Wu Ching I , Liu Cheng Chih , Wu Yi Yen
Published: October 2011

It is clear that urban river eco-security model may provide an alternative choice of urban river Engineering Construction decision and correspond to the direction of sustainable city. Our goal is to provide a framework to conceptualize the impacts of various urban river eco-security development strategies over a time scale of several decades, while taking into account interactions and feedback loops between various criteria to the fullest extent allowed by available data and theory. Flooding is serious natural disaster, but there is a lack of integrated strategy on urban river ecosystem management in Taiwan. This study aims to construct a integrated index formwork by function and goal of eco-security of urban river. The other purposes of this research are apply the System Dynamics to understand the trend on forecast modeling. Formulate a system dynamics model to simulate the trend of Tamsui River Eco-Security. This research , construction of five subsystems, “discharge security” ,” purification security”, “water security”, “habitat security” and “biosecurity”. The error value between simulation and real situation are few to prove the model is effective .The study results indicate that the eco-security for Danshui River is going to biomass raising, drainage raising, habitat increasing and pollution reducing. The cogitation has integrated by system dynamic model which coming together to form precaution, water use, conservation and ecological restoration to keep the sustainability of urban nature resources by the research.
Cr2O3 Flux Assisted TIG Welding of Type 316L Stainless Steel Plates
Authors: Tseng Kuang Hung , Chen Yung Chang , Chen Kuan Lung
Published: October 2011

An exploratory study was conducted to investigate the effect of Cr2O3 flux used in tungsten inert gas (TIG) welding on the weld morphology, retained ferrite content, welding residual stress, and hot cracking susceptibility when welding 5 mm thick type 316L stainless steel plates. The results showed that Cr2O3 flux assisted TIG welding can create a high depth-to-width ratio weld. Since the activated TIG welding can reduce the heat input per unit length in welds, and the residual stress of the weldment can be reduced. TIG welding with Cr2O3 flux can increase the retained ferrite content of stainless steel 316L weld metal and, in consequence, the hot cracking susceptibility is reduced.
Design and Implementation of Agricultral Greenhouse Environmental Monitoring System Based on Internet of Things
Authors: Li Shao Ling , Han Yu , Li Ge , Zhang Man , Zhang Lei , Ma Qin
Published: October 2011

During agricultural production, some information (such as temperature,humidty,wind, rainfall and PH of soil) is obtained by manual measurement method,which exists many problems,for example time-consuming, laborious problem.In this paper, the agricultural greenhouse environmental monitoring system is designed based on the Internet of Things,which realized remote realtime monitoring of the environmental information in greenhouse,combining with the Internet,wireless network and mobile network.A wireless sensor network is established for collecting environmental information such as temperature and humidity by using ZigBee protocol.Finally,the collected environmental information is accessed into the internet and mobile network through the control center .The monitoring system can realize the short message warming and real-time monitoring of agriculture enviromental information.
Effect of Input Shaping on Response of Inertia Plants
Authors: Dong Ming Xiao , Li Rui Chuan , Xu Qin Zu
Published: October 2011

A poorly designed control system can lead to excessive residual vibration and long setting time. This paper investigates the effect of input shaping on control efficiency. To perform this investigation, we design a PD controller combined with input shaping for an inertia plant. We then subject it to four standard types of inputs. The responses of the control systems are described by analytical expressions. The performances of PD control and PD combined with input-shaping control are thoroughly analyzed and compared. Simulation results show that PD feedback control enhanced with input shaping minimizes overshoot and setting time.
Effects of Condensed Silica Fume and Superfine Cement on Flowability of Cement Paste
Authors: Kwan A. K. H. , Chen Jia Jian , Li L. G.
Published: October 2011

Addition of supplementary cementitious materials (SCM) has been contradictorily reported to be beneficial or detrimental to the flowability of concrete and no general conclusion can be drawn up to now. In order to comprehensively disclose the effects of SCM on the flowability, an experimental study had been carried out to measure the flowability of a total of 100 cement paste samples with different condensed silica fume (CSF) and superfine cement (SFC) contents at a wide range of water/cementitious materials (W/CM) ratios. The results showed that the addition of CSF would decrease the flowability at a relatively high W/CM ratio but increase the flowability at a low W/CM ratio, while the addition of SFC could generally improve the flowability of cement paste. Joint addition of SFC and CSF would not exert any definite effect on flowability at a relatively high W/CM ratio but could improve the flowability at a low W/CM ratio. In-depth analysis showed that these results could be well explained by the theory of water film thickness.
Evaluation of Concrete Fatigue Measurement Using Standard and Non-Linear Regression Model
Authors: Seitl Stanislav , Šimonová Hana , Keršner Zbyněk , Canteli Alfonso Fernández
Published: October 2011

The paper deals with the problem of estimating the S-N curve for the cement based composites under fatigue loading. Selected approximation curves for mechanical-fracture parameter values derived from specific fracture energy in time are used to determine the most accurate fatigue parameter values corresponding to the age of specimens when dynamic tests were performed. For standard description of S-N curve the power dependence and Weibull model developed by Castillo et al. are used to discuss the problem under study and the suitability of using models as an input data for finite element modeling
Assessing the Effect of Microclimate on Building Energy Performance by Co-Simulation
Authors: Yang Xiao Shan , Zhao Li Hua , Bruse Michael , Meng Qing Lin
Published: October 2011

To provide a more accurate prediction of building energy consumption, it is necessary to take into account the influence of the microclimate around a building establishing through the interaction with other buildings or the natural environment. This paper presents a method for the quantitative assessment of building performance under any given urban context by linking the urban microclimate model ENVI-met to the building energy simulation (BES) program EnergyPlus. The full microclimatic factors such as solar radiation, thermal radiation, outdoor air temperature, humidity, and wind speed have been considered in the proposed scheme. The method outlined in this paper could be useful for urban and building optimal design.
Present Situations and Development Trends of Main Technologies of Lubricant Additives
Authors: Wu Chao , Yang Shi Liang , Yang Hong Wei , Li Teng , Bi Zhi Rong
Published: October 2011

This paper introduces the main technologies of lubricant additives (including compounding technologies, environment friendly technologies, nanotechnology and wear self-repairing technologies), analyzes their characteristics and problems and points out that environment friendly synthetic multi-functional additives are the main development trend of lubricant additives.
Evaluation of Equivalent Circulating Density in Deep Water Dynamic Kill Drilling
Authors: Jiang Xiao Ling , Lei Zong Ming , Meng Qing Bao
Published: October 2011

Dynamic kill drilling is a technology which is applied in order to control the deep water drilling shallow gas or shallow wells flowing by establish a normal cycle automatically in the deepwater shallow wells section. Equivalent circulating density (ECD) is an important parameters to control the bottom hole pressure, in the ECD estimate, if we don’t consider the effects of low temperature on rheological parameters of drilling fluid, it will result in errors in ECD estimates. Considering the impact of low temperature on the rheological parameters, this paper determines the temperature, rheological parameters and the annulus circulating pressure loss of each well section. Then Superposing each well section annular circulating pressure loss together, and finally calculate the equivalent circulating density. The deeper the water the greater of difference between ECD prediction model and the results calculated by rheological parameters on ground, and the more shallow wells the larger of difference. Therefore, in the process of deep water surface layer dynamic killing, We need to predict the equivalent circulating density of drilling fluids (ECD) accurately.
Propagation of Lamb Waves in one Dimensional Nesting Fibonacci Superlattices Thin Plates
Authors: Gao Jian , Wu Xiu Fen , Zhang Xing Gan
Published: October 2011

We present a comparative study on band-gap structures of Lamb waves propagating in one-dimensional periodic sequences thin plate, Fibonacci sequences thin plate, and the nesting Fibonacci superlattices thin plates with different generation numbers respectively. By comparing among TPS in different plates, it is found that Fibonacci model doesn’t present band gaps with generation numbers , , and . Band gaps occur and split in Fibonacci model when generation number increases to . But for the nesting Fibonacci superlattices with , more band gaps occur and band gaps become very flat. With generation numbers increase to , , and , more new band gaps present. It provides flexible choices for real engineering requirement.
Gas Turbine Cylinder Nc Milling Tilt Hole Parametric Programming
Authors: Yang Shun Tian , Zhang Wan You , Cui Da Wei , Shen Wei
Published: October 2011

In machining, it often encounters milling large inclined holes with spindle on unvertical space. On 3 axis coordinated NC boring-milling machine, universal Angular milling head for changing spindle direction is adopted to align hole axis with milling cutter axis, using geometrical space establishes mathematical model between each processing variables to realize NC program parameterization of space inclined hole milling. Results show that the work piece only need chucking once, give the relevant variable values, can be completed holes, processing high accuracy, saving labor and power, and it also can be extended to machine similar space bevel surface and tilt slot.
Research on Preparation and Properties of Al-Mn Alloy Coating in NaCl-KCl-AlCl3-NdCl3 Molten Salts
Authors: Yu Xian Jin , Zhang Li Peng , Ge Zhi Wei , Dong Yun Hui , Li Dang Gang , Liang Han Bing
Published: October 2011

Al-Mn alloy coatings were electrodeposited on an iron substrate from AlCl3-NaCl-KCl low-temperature molten salts with anhydrous MnCl2 enhanced by the addition of NdCl3.The microstructure and properties of the Al-Mn alloy coatings were investigated, and scanning electron microscopy, X-ray diffraction, and polarization curves were used to determine the composition, surface morphology, phase structure, and corrosion resistance of the obtained deposits. The results show that the surface coatings were smooth, and that the crystallites were dense and uniform when 0.23 wt% NdCl3 was added to the molten salt. An amorphous mixture of Al and Al6Mn was obtained. NdCl3 enhanced the corrosion resistance and increased the hardness of the single amorphous phase alloys. The pitting potential of the coating was approximately −1.04V, and its hardness was 392 kgf/mm2.
Thermal Effect on Buckling of General Dome Ends Using Finite Element Method
Authors: Abdi Behzad , Mozafari Hamid , Amran Ayob , Kohandel Roya
Published: October 2011

In this study, the elastic buckling behavior of general dome ends under presumed temperature distribution and external pressure was studied. The Finite Element Method (FEM) was used to predict the elastic buckling pressure behavior when the domes were subjected to various operating temperatures. The freedom of the edges of the dome ends was completely restricted to simulate clamped end conditions. The four-centered ellipse method was used to construct the geometry of the dome ends. The influence of geometrical parameters such as thickness, knuckle radius, and the ratio of minor axis to the major axis of dome ends and the effect of temperature on critical buckling pressure of hemispherical, ellipsoidal, and torispherical dome ends were studied. It has been found that the under thermal condition, the thickness and the shape of the domes have the most significant effect on the critical buckling pressure. Two models of torispherical and ellipsoidal dome ends are analyzed by using finite element analysis.
Preparation of Lithium Niobate Powders by Mechanochemical Process
Authors: Luo Ju Hua
Published: October 2011

Lithium niobate powders were prepared by mechanochemical treatments using Li2CO3 and Nb2O5 as raw materials. Scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) were employed to evaluate the morphologies and structures of samples. The mechanism of LiNbO3 formation of the ground mixture samples was discussed. The crystal structure of mixture was collapsed into a disordered structure, which increased with increasing grinding time. At the same time, the specific surface area increase and the bond energy reduction of the mixture occurred. Consequently, high energy ball milling enables increase of the internal energy, reduction of the activation energy, and improvement of the uniform mixing stage, which resulted in direct formation of singal phase LiNbO3 at a low temperature (500°C). However, the temperature must reach 1200°C for the traditional method.
Numerical Simulation of Springback in Air-Bending Forming of Sheet Metal
Authors: Fu Ze Min
Published: October 2011

In this paper, the influencing factors of springback for air-bending of sheet metal are introduced. The bending springback in various process parameters is simulated with a ABAQUS FEA software. The influence of different parameters on bending springback is investigated and some effective methods for predicting and restricting sringback are put forward.
The Characteristics Research of Tube Vortex Based on Large Eddy Simulation
Authors: Zhang Dun , Zheng Yuan , Zhao Ying , Huang Jian Jun
Published: October 2011

Numerical simulation of three-dimensional transient turbulent flow in the whole flow passage of a Francis turbine were based upon the large eddy simulation(LES) technique on Smargorinsky model and sliding mesh technology. The steady flow data simulated with the standard k-εmodel was used as the initial conditions for the unsteady simulation. The results show that LES can do well transient turbulent flow simulation in a Francis turbine with complex geometry. The computational method provides some reference for exploring the mechanism of eddy formation in a complex turbulent of hydraulic machinery.
A Study on Die Roll Height of Special Automobile Seat Recliner Gear According to Die Chamfer Shape in Fine Blanking Tool
Authors: Kim Jong Deok , Kim Heung Kyu , Heo Young Moo , Chang Sung Ho
Published: October 2011

In this paper, the effect of die chamfer shape on the die roll height was studied by fine blanking experiments for imaginary special automobile seat recliner gear. The three die inserts with different die chamfer shapes were machined, and fine blanking tool was manufactured. Using the fine blanking tool, three experiments were conducted on the 650 ton fine blanking press. Each die roll height was measured, analyzed and we found the tendency of die roll heights on imaginary special automobile seat recliner gear to increase with increasing die chamfer angle, with the horizontal distance of die chamfer being constant. This result can be used to minimize the die roll height of fine blanking gear parts when designing die chamfer of fine blanking tool.
Analytical and FEM Modeling of Electormagnetic Radial Force for Switched Reluctance Motor
Authors: Zhang Jing Jun , Long Rong , Zhang Hai Jun , Ma Xi Qing
Published: October 2011

This paper bases on the magnetic method combining the tensor maxwell in considering magnetic saturation method, in considering magnetic saturation effect and actual switched reluctance motor stator and rotor under the premise of very wide, deduces and sets up a analytical models of radial force which can apply directly to switched reluctance motor stator and rotor with unequal extremely arc equal two circumstances analytical models of radial force. This model conforms to the actual switched reluctance motor structure and operation characteristics and structure optimization design for switched reluctance motor, electromagnetic vibration and noise prediction and control provides theory basis. With a prototype as an example, this paper calculated results and the analytical model of the finite element analysis of the results compared to verify the correctness of the analytical model built.
Analysis of Cloud Computing and Information Security
Authors: Wang Ke Nan , Qian Shao
Published: October 2011

The paper is to introduce the basic concept t, system architecture and the main forms of cloud computing, and analyze the opportunities and challenges brought by cloud computing to information security.
Present Situation Analysis and Development Trend Forecast of China’s Construction Industry
Authors: Tang Jing Jing , Liang Wen Zhao , Hu Shu Hai , Zhao Ting Sheng
Published: October 2011

2011 is at the beginning of the twelfth five-year plan (the twelfth five-year plan of national economy and society development in the People’s Republic of China), so it is necessary to review the situation of China’s construction industry and make its development trend forecast, which will be useful to guide China’s construction industry and the macro-economic control. According to the scale of fixed assets investment and the result of difference method, there is a proper evaluation of current China’s construction industry. The 4 billion investment plan had a huge impact on the China’s construction industry in the period of the eleventh five-year plan.This paper is to forecast the output and the added value of China’s construction industry in the period of the twelfth five-year plan by the use of time series analysis, based on the data from 2001 to 2010. The results show that China’s construction industry will get a rapid growth yet in the period of the twelfth five-year plan.
Research on the Virtual Simulation of Emergency Management for Coal Mining Enterprises
Authors: Yuan Pu Yu , Peng Wu Liang
Published: October 2011

For the design and development of fully functional emergency management decision support systems for coal mining enterprises, the paper studies enterprise simulation frameworks of the mine emergency management system. Firstly, the function framework of HLA-based virtual simulation in coal mining enterprise is presented. By integrating HLA / RTI, etc, we integrate immersive interactive man-machine interface device as constructed structure of the virtual policy framework. And then, a coal mining enterprise virtual simulation process model is built. Finally, the virtual simulation architecture for the emergency management of coal mining enterprise is designed.
Semantic Web Service Composition Based on Topic Maps
Authors: Ma Hong Jiang
Published: October 2011

To improve efficiency and accuracy of semantic web service composition, a topic maps oriented semantic web service composition policy is proposed. Firstly describes topic maps and web service with ontology, then defines a service composition view to implement service composition mapping. Secondly, a matching dependency for semantic web service is defined, and employ greedy genetic algorithm to optimize the results. Finally, this paper implements the method based Amazon services set and the results show that it is better efficiency than old method.
Short Wall Box Style Mining Method of Strip Coal Pillar under Town
Authors: Guo Zhong Ping , Li Jia Zhuo , Li Chang Hua , Ge Hai Bin
Published: October 2011

To recover strip coal pillar and reduce cost after strip mining, the short wall box style mining method was presented. Strata stability was analyzed based on support plate theory, mechanical model of the second strata movement was created, and safety factor was deduced .The ground movement and deformation were predicted, with probability integration method. The application demonstrates that this mining method can protect buildings on earth’s surface, improve the recovery ratio of coal and reduce cost. This mining method has a good economic advantage and environmental benefit.
The Development and Design of Human Machine Interface of the Monitor & Control System for Nuclear Power Plants
Authors: Cheng Shou Yu , Liu Xin Kai , Peng Min Jun
Published: October 2011

The Human Machine Interface (HMI) of Monitor& Control System (MCS) is an important part of main control room in Nuclear Power Plants (NPP). The MCS is integrated by networks, digital computers and computer software. The paper discusses a new design mode for the HMI of MCS in Nuclear Power Plants. How to make the MCS information available is the focus of the HMI research. The paper discusses the design and research about the main layout and functions of the HMI. In order to verify and validate the design of HMI, the HMI of MCS is developed by a configuration software of JADE. HMI debugged with the NPP simulator. The Test illustrates that the HMI can help the operators to get very important information from MCS, which help the operators to operate the nuclear plant safely and reduces the human error.
Strain Analysis of Surface Bonded Optical Fiber Sensors
Authors: Her Shiuh Chuan , Tsai Chang Yu
Published: October 2011

Optical fiber sensors with light weight, small size and immunity to electromagnetic interference have been found to be a promising device for use in the development of smart structures. It is well known that the strain transfer from the host structure to the optical fiber sensor is dependent on the bonding characteristics such as adhesive layer and bonded length. In this investigation, the optical fiber sensor is surface bonded on the host structure. A theoretical model consisting of the optical fiber, adhesive layer and host material, is proposed to determine the strain in the optical fiber sensor induced by the host structure. The theoretical predictions were validated with the numerical analysis using the finite element method.
Study of Image Analysis Methods Based on Tollennar Equation
Authors: Guo Ling Hua , Zhang Mei Yun , Guo Xin Hua , Xie Yu Lin
Published: October 2011

It is depended on the experience to identify the screen line and angle for the print products. In this paper, We designed the screen directions determiner according to the principle how the Moire Fringe produced. An example of serial screen line 85,100,120,133,150,175,200Lpi is given, and a method of design is proposed for Suitable screen angle and output points of laser phototypesetter. Analysis of quantization about screen line and angle for the print products are discussed. At the same time, It is derived from Moire formula and the dot transmittance Equation. The result has an important guiding significance for printing practice.
The Optimal Transmission Range for Strip-Based Wireless Sensor Networks
Authors: Wang Zheng Jie , Zhao Xiao Guang , Qian Xu , Cheng Xue Zhen
Published: October 2011

Strip-based sensor networks consist of a large amount of sensor nodes, which is characterized by multihop communication patterns. The nodes closer to the base station are required to forward more data than the nodes farther from the base station, leading to the problem of the energy hole and leaving the the areas of the network unmonitored. This paper analyzes energy consumption model of the uniform deployment and the nonuniform deployment and proves that there is an optimal transmission distance for these deployment strategies. The analysis shows clearly that the nonuniform deployment is more energy effect and more energy balance, which extend the network lifetime compared with the uniform deployment strategy.
Relativity Analysis between Dynamic and Static Modulus of Elasticity on Different Thickness Wood-Plastic Structural Plates
Authors: Yu Gui Wen , Hu Ying Cheng , Gu Ji You
Published: October 2011

The relativity was evaluated between dynamic modulus of elasticity (MOE) and static MOE, in order to assess the potential of using nondestructive testing (NDT) method as a checking tool for mechanical properties of wood-plastic structural plates. The dynamic MOE was evaluated on a FFT system, and the static MOE was determined by three point bending test. All of specimens were made of polyethylene（PE）and poplar flour. A significant correlation between the dynamic MOE and the static MOE was obtained from relativity analysis. These results suggest that the NDT method could be appropriate to estimate the dynamic MOE of specimens with different thickness.
An Improved Algorithm to Near Infrared Multispectral Ice Detection
Authors: Gao Jian Shu , Han Ren Yi , Yu Zhi Jing , Qiao Wen
Published: October 2011

In order to improve the accuracy of near infrared multispectral ice detection on aircraft wings, we present an improved unit detection algorithm to reduce the noise influenced by the ice detection system itself. The improved algorithm, first select matrices being 3*3 as a detection unit, then calculate the contrast value of the five pixel points in the cross region of the unit, and finally count the number of pixel points, whose contrast value are larger than the threshold value of ice on the surface. The experimental results show that the unit detection method has high accuracy and efficiency compared with conventional point-by-point method.
Mining Least Privilege Roles by Genetic Algorithm
Authors: Dong Li Jun , Wang Mao Cai , Kang Xiao Jun
Published: October 2011

Role-based access control (RBAC) has been adopted widely by reducing the complexity of the management of access control. The least privilege principle is a very important constraint policy of RBAC. A key problem related to this is the notion of goodness/interestingness – when is a role good? Devising a complete and correct set of roles for supporting the least privilege principle has been recognized as one of the most important tasks in implementing RBAC. In this paper, to address this problem, we map this problem to a formal definition in mathematics – δ-approx least privilege mining (δ-approx LPM). We introduce a method named GABM to enforce LPM based on the generic algorithm. By GABM, the least privilege roles can be found out correctly. Our experiments display the effect of GABM. Finally, we conclude our work.
Reliability Assessment of a Gear Based on Moment Method
Authors: Yin Xiao Wei , Qian Wen Xue , Xie Li Yang
Published: October 2011

Gears are widely used in many engineering fields such as mining machinery, aerospace, transportation and petrochemical and are common and important parts for engineering, but for some gears it is still tedious to build the 3D models and assess their reliability. It is important for a gear to do reliability assessment, especially for some gear that under complex load conditions. In order to improve the reliability and stabilization, a gear assessment method is introduced and an example is given, and the example shows that do reliability assessment is useful and effective.
Research on Coupled Tasks’ Sequence Optimization Based on Qualitative and Quantitative Partial Order
Authors: Wang Zhi Liang , Wang Yun Xia , Ma Yin Zhong
Published: October 2011

The different sequences of the coupled tasks set lead to different development cycles, so optimizing sequences is a key for reconstructing complex product development process. As there are overall iterations stemming from activities’ coupling in complex product design process, this paper first proves two propositions of ordering coupled tasks by stochastic process theory: 1) more shorter the development cycle of a coupled activities subset is , more shorter the development cycle of the entire coupled activities set is. 2) If the execution sequence of the coupled activities set is changed, the development cycle of the coupled tasks set will also change. When execution order of two activities is converted into partial order of two elements, this paper presents a sequence optimization algorithm based on qualitative and quantitative partial order (SOQQ) from these two propositions. Simulation has been used to confirm SOQQ algorithm’ validity and high efficiency.
Research on Game Analysis and Resources Allocation in Multi-Project Management
Authors: Zhang Qi , Chen Hai Bing
Published: October 2011

In order to cope with the pressure from competition of global marketization, it’s common for enterprises to carry out multiple projects at the same time. The following has always been the focus and key issues for management wanting to achieve greater operational benefits when carrying out multiple projects simultaneously 1. resource allocation 2. shorten project-development cycle by coordinating relationships between team members 3. lower operating cost This paper covers 4. Introducing the concept of Multi-Project Management and its difference from general project management 5. Analyze the advantages and existing problems of Multi-Project Management 6. Address the issues such as resource allocation and conflicts resolution/coordination between project manager & operation manager by using Quantitative Analysis such as Game theory 7. Provide theory reference and practical suggestions for entrepreneurs.
Simulation Model of Aggregated Equipment Combat Unit’s Mission Maintainability in the Mobile Mission
Authors: Feng Hui Juan , Chen Le , Zhao Shi Wei
Published: October 2011

The equipment combat unit is usually in the aggregated state when operate mission, and the mission maintainability is an important factor for its operational effectiveness. There were kinds of parameter to measure the mission maintainability, such as Mean Downtime and Mission Time to Restore Function. Based on the analyses to layers and performance of the aggregated equipment combat units, the signification of aggregated equipment combat units’ Mission Time to Restore Function was adopted and analyzed, the simulation method and simulation flow for the mobile mission of aggregated equipment combat units were given, and then the simulation model under ExSpect was constructed. Finally, an example was used to prove the simulation model.
Research on Touch Experience Design in Graphic Design
Authors: Yan Ru Shan
Published: October 2011

Human consciousness has multiple channels and not only relying on eyes. People uses touch sense to understand and feel world since it is feeling system's reaction to material because of physiological stimulation. The essay discusses on application of touch experience in graphic design and how to use touch organ sense to design graphic designing that conform with audience demand by discussing on designing concept of touch experience and researching on touch sense expression from perspective of designing psychology.
The Study of Prediction Model Based on Morlet Wavelet Neural Network
Authors: Yang Hui Zhen , Zhao Wen Guang , Chen Wei , Chen Xu Quan
Published: October 2011

Wavelet Neural Network (WNN) is a new form of neural network combined with the wavelet theory and artificial neural network. The wavelet neural network model based on Morlet wavelet and the corresponding learning algorithm were studied in this paper. And through learning the wavelet neural network model is applied to all kinds of engineering examples, it proved that the wavelet neural network prediction model which has a more flexible and efficient function approximation ability and strong fault tolerance, and with high predicting precision.
Series System Failure Rate Modeling and the Mechanism to Yield Bathtub Curve
Authors: Xie Li Yang , Lin Wen Qiang , Zhang Ming Chuan , Yan Shao Ze
Published: October 2011

Failure rate functions were usually constructed in terms of life distribution. The present paper defines “discrete failure rate”, analyzes the dependence of failure rate curve shape on the probabilistic property of load-strength interaction, and develops load-strength-interaction based system failure rate model. For the majority of mechanical equipment, operation load is normally a random process, components are subjected to a large number of stochastic load actions during its service life. Meanwhile, material property degrades continuously owing to the failure mechanisms such as fatigue. It is the ever changing load-strength relationship that yields the variation in failure rate. Based on the criterion that failure occurs when a load higher than the relevant strength appears, failure rate model is developed based on the interaction mechanism between load and residual strength, and their statistical characteristics as well. Based on the interpretation to the variation of failure rate in terms of load uncertainty and strength uncertainty, the effect of statistical risk of load and the effect of strength degradation on failure rate curve shape are highlighted.
Wavelet Analysis of Misalignment Fault of Rotor-Bearing Systems
Authors: Liu He Nan
Published: October 2011

A misalignment rotor-bearing systems is studied as an object. Comparing two kinds of vibration characteristics of 0 torque excitation and linear torque excitation. The experimental data are analyzed by FFT and wavelet. Conclusion is obtained. Certain torque excitation can control oil whirl to a certain extent. On the other hand, linear torque excitation can increase degree of misalignment.