bluuebunny/crossref_metadata_2025 huggingface dataset:
Driving Behavior Parameter Sensitivity Analysis Based on VISSIM
Authors: Liu Wen Wen , Qin Yong , Dong Hong Hui , Yang Yan Fang
Published: October 2014

The determination of the parameter set to be corrected is the premise and key of microscopic traffic simulation model’s calibration. In order to find out the sensitive parameter, this paper chooses Ronghua Road and Wing King Street intersection and the Shangdi Roundabout as experiments, and selects the queue length and travel time as the evaluation index, makes sensitivity analysis of calibrated parameters by microscopic traffic simulation software Vissim. It adopts a line chart method, range analysis and sensitivity coefficients to make comparative analysis of the evaluation results. At last, sensitivity parameters in intersection and roundabout are not identical.
Application Analysis on Force Multiplication Drawing Device
Authors: Liu Wei , Wen Hai Tao , Cui Zhen Tian , Lou Huan , Liu Yuan Zhe , Shang Qian Ru
Published: October 2014

In the field of mechanical installation and repairing, drawing devices are often used to disassemble or push up components of various types of axie and set. Nowadays it is widely used in areas such as mechanical installation, machinery manufacturing, machinery repair, but still have problems to be used well with an appropriate force. The article presents a new kind of drawing device named force multiplication drawing device. It is designed by using the lever principle and can acquire much stronger drawing force. After theoretical calculations, it is proved to be very valuable.
Study of Intercity Travel Based on GIS Spatial Analysis
Authors: Mou Zhen Hua , Li Mei Ling , Cui Dong Xu
Published: October 2014

It take 4010 samples which have intercity travel between Guangzhou and Foshan under the background of urban integration as studying object and acquire travel information from internet investigation. It cross analyze the intercity travel characteristics which contain travel purpose, mode, frequency and cost and the travelers social attributes which include the career, age and revenue through the methods of Social Statistics and GIS spatial analysis. It also studies the changing of Guang-Fo intercity travel and the distributing characteristics of travel origins.
Disaster Mitigation Based on Natural Disaster Chain Structural Model
Authors: Hu Min
Published: October 2014

On the basis of properties analysis of disaster chain, the assumption of connotation and extension of systematic natural disaster chain is clarified. Therefore the natural disaster chain structural model in the form of mathematical language is defined, and the relation and property of the structural model is studied. According to the analysis of the mathematical model of disaster chain, it shows that the disaster chain is caused and dominated by both the outside environments and structural relation of inner state. The outside environment influence is the gestation of disaster and the interaction of inner state is the necessary condition of disaster chain. The disaster mitigation mode is studied from the point of both sides, and the emphasis is on the inner structural relations chain-cycle. An example in view of snowstorm in 2008 is presented to apply and verify the above theory.
The Value of Ultrasonography Screening Trisomy 21 during the Second and Third Trimesters of Gestation
Authors: Pan Yu Ping
Published: October 2014

Objective To investigate the value of ultrasonography screening trisomy 21during the second and third trimesters. Methods Amniocentesis and cordocentesis were performed on 3110 and 187pregnant women respectively with indications for prenatal diagnosis to detect karyotype of the fetus during second trimester and late pregnancy, The detection rate of trisomy 21 was compared in pregnant women of different indications. To analyze the relationship between the ultrasonography abnormalities and trisomy 21. Results In chromosomal karyotypes analysis of 3110 pregnant women by amniocentesis, 41 trisomy 21 were detected, The detection rate of trisomy 21 was 1.32%. There were 98 in 3110 pregnant women with ultrasonography abnormalities, 6 trisomy 21 were found within them and the detection rate was 6.12%, the detection rate of trisomy 21 detected by ultrasound (6.12% ) was higher than the Down,s syndrome high risk group (0.98%), advanced age group (0.58%) Within 187 pregnant women of chromosomal karyotypes analysis by cordocentesis, 9 trisomy 21 were detected and the detection rate of trisomy 21 was 4.81% . There were 128 in 187 pregnant women with ultrasonography abnormalities, 5 trisomy 21 were found within them and the detection rate of trisomy 21 was 3.91% . (P<0. 05). Conclusions During the second and third trimesters, ultrasonography has great value .
Dynamic Model and Vibration Characteristics of Planetary Gear Train Based on Transmission Errors
Authors: Xu Kai , Jia Ping , Qiu Ming , Yang Jian Jun
Published: October 2014

The paper defines the transmission errors of planetary gear trains, derives from kinetic tooth contact analysis. The method to calculate transmission errors of planetary gear trains is put forward. An integrated platform was constructed for measuring gear noise, vibration and transmission error to verify the effectiveness and feasibility of the analytical. Finally, experimental investigations of the gear noise and vibration spectrum in time domain are introduced, which was solved and simulated in Matlab software.
Process Quality Evaluation Based on Maximum Entropy Principle
Authors: Wang Yu Hong , Zhang Chuan Liang , Dai Wei , Zhao Yu
Published: October 2014

Process quality evaluation plays a significant role in ensuring product quality and improving customer satisfaction. Currently, the research on process quality evaluation lacks consideration of interactive coupling between product processing parameters and equipment reliability. With using the analysis of physics of failure, the relation model between the products quality and the processing equipment reliability was established. Besides, based on Maximum Entropy Principle (MEP), an evaluation method of process quality was provided. Finally, we verified the feasibility of the method through the combination in an application case.
Research on Joint Optimization of Level of Repair Analysis and Spare Parts Stocks
Authors: Xu Li , Li Qing Min , Li Hua
Published: October 2014

According to the real background of repair and supply of spare parts, aims to reasonably plan that how to and where to repair the failure parts, where to deploy the repair resources and develop the initial spares configuration program such that the availability target of equipment is achieved with the lowest investment cost, the joint optimization model for level of repair analysis (LORA) and spare parts stocks is established consisting of variable cost and fixed cost that produced in maintenance as well as the equipment availability, and a new joint optimization method for the model is proposed combined Invasive Weed optimization (IWO) and margin analysis, then the optimization is realized. In a given example, the optimization result is gotten, through which the validity of the model and method is proved.
The Research of Market Risk Identification for Product Development and Design with the Industrial Design Innovation Promote the Economic Development of Agricultural Machinery Manufacturing Industry
Authors: Song Qiang , Su Ke
Published: October 2014

The market of agricultural machinery manufacturing industry has been an unprecedented development in recent years. After the increasing homogenization of the products functions, increasing competition, industrial design as a means of advantageous product innovation, becoming many companies new competitive weapon. However, the projects of product development in many enterprises, the success rate is not high, the innovation and the risk remains high, which point we focus on is that the risk factors design brings to market. Study the basic design risk identification rules, procedures and methods, citing the risk of identification methods and their characteristics, laid the foundation for future theoretical research and product innovation applications.
Empirical Research on Logistics Engineering Based on AHP and Entropy Method
Authors: Zhang Yan Rui , Cao Wen Fu
Published: October 2014

Taking fresh agricultral products sale logistics systems as research object, this paper established an index system for the risk evaluation of the sale logistics of fresh agricultral products. In determining the weight of evaluation index, the calculation is combined with AHP and entropy method, and we evaluated the safety of the sale logistics of fresh agricultral products using Fuzzy comprehensive evaluation.
The Experimental Research of the Application of Liquid-Box Self-Circulation Evaporative Cooling System in Electronic Components
Authors: Cao Rui , Ruan Lin , Xiong Bin , Dong Hai Hong , Guo Shu Qin
Published: October 2014

Because of high cooling efficiency, simple structure and good reliability, the liquid-box self-circulation evaporative cooling system has broad applications in the field of electronic equipments. By designing and developing a set of Liquid-box self-circulating evaporative cooling system experimental platform for electronic components. We can study the influence of pipe diameter, height of liquid level and thermal conductive pad on the cooling efficiency of the system.
Dispersion Management and Nonlinearity Enhancement in a Hybrid Nanofiber with a High Index, Cross-Slot-Structure Nanocore
Authors: Jiang Kai Wei , Pan Yu Tian , Wang Guan Jun , Xiao Jing
Published: October 2014

A highly nonlinear, dispersion flattened hybrid nanofiber with a silicon/silica cross-slot-structure nanocore is proposed and analyzed, which is insensitive to polarization for implementing quasi-TE and quasi-TM fundamental modes transmission due to the cross slot effect. Simulation results show that fundamental mode with ultra-small mode effective areas and high nonlinearity at TE and TM polarizations, which are confined in the narrow cross slot by four silicon ribs, can be achieved via this cross-slot-structure core. Moreover, the cladding of four large-air-holes contributes to the tailoring of the group velocity dispersion (GVD) and further enhancment of the nonlinearity. Our results indicate that ultra-small Aeff of 0.098μm2 and flat anomalous GVD with less than 13.5 ps.km-1.nm-1 dispersion ripple at C-band are realizable.
Free Vibration of High-Rise Chemical Tower Controlled by Super-Elastic Shape Memory Alloy Cables
Authors: Sun Shuang Shuang , Liu Xing Chao , Lu Mei
Published: October 2014

In this paper, the super-elastic shape memory alloy (SMA) composite cables are used for vibration control of high-rise chemical towers during the free vibration. The displacement and velocity response to initial displacements were studied by the lumped mass method combined with Newmark integration method. It is found that super-elastic SMA cables can reduce the free vibration amplitudes and shorten the attenuation period of high-rise chemical towers effectively.
Research on CFRP External Pre Stress Reinforcing Vertical Crack of Box Girder Roof
Authors: Wang Xin Zhong
Published: October 2014

the article is about longitudinal crack of concrete box girder roof, and it designed a reinforcement model. As the pre stressed material, CFRP could reach 30% of reinforcement efficiency under different loads in design model through external reinforcement upon calculation and analysis. And its crack width greatly reduces. In this way, the reinforcement purpose could be realized, and the mechanical properties of CFRP concrete could be fully played. The effect is obvious.
Stiffness Matching Design of Vehicle Bumper Anti-Collision Beam Considering Energy Absorption and Economical Performance
Authors: Xia Lei , Jiang Hao Bin
Published: October 2014

To improve energy absorption and economical performance of a vehicle bumper anti-collision beam, the 40% offset static pressure test and finite element (FE) simulation are carried out. Considering factors such as design function, manufacturing cost and repair expense, a reasonable deformation mode of anti-collision beam is proposed. Based on the relationship between deformation and stiffness, a stiffness matching mode of anti-collision beam is proposed. Because the original design of the anti-collision beam is unreasonable, the improvement is carried out by adjusting structural and material parameters. Simulation results show that the total energy absorption of improved anti-collision beam is higher, which meets the requirement of sufficient energy absorption. The reasonable deformation mode is realized by meeting the stiffness matching relationship.
First-Principles Study on Optical Properties of Cd-Doped Single-Walled (8, 0) ZnO Nanotube
Authors: Wu Yi , Huang Jian Cheng , Cui You Chao , Zheng Shu Kai
Published: October 2014

The band structures, density of states, and absorption spectra of pure and Cd doped single-walled (8, 0) ZnO nanotubes are calculated using first-principles based on density functional theory. The calculation results show that the import of Cd leads a remarkable decrease to the forbidden bandwidth of ZnO. Consequently, more electrons in the valence band can be motivated to the conduction band by the visible light, which results in a further enhancement of visible light absorption and a wider absorption range.
Two-Order Moment Trajectory Model of Two-Phase Turbulence Flow Based on Particle PDF Transport Equation
Authors: Xu Jiang Rong , Wang Lu
Published: October 2014

Based on the PDF transport equation of particle, a two-order moment trajectory model of particles (TOMTM) is proposed to obtain reasonable statistical characteristics of a two-phase flow. Using the method proposed by Risken, It is shown that TOMTM is just the solution of the particles PDF equation
Aerodynamics Research of Thermal Fluid Circulation in a Heated Cavity
Authors: Zhao Guang
Published: October 2014

In this paper, numerical simulation of natural convection in a closure square cavity with heating source on the basement is carried out using thermal lattice Boltzmann method. The purpose of this work is to analysis the physics of mass and heat transfer in such a condition. For different Rayleigh numbers, the relative heating area ratio is changed in the range of 0.1-1.0, correspondingly. It is found that the flow pattern is symmetrical for increases from 103to 106, and the boundary layers at low temperature become thinner, also the circulation rate is higher. For a special Rayleigh number, is as a monotone increment function of relative heating area ratio, and the value of which almost increases linearly when the area is below 0.8, and then reach to its maximum exponentially.
Adaptive Control of Systems with Time Varying Delay: A Sliding Mode Approach
Authors: Xie Fa Xiang , Ji Bo Hai
Published: October 2014

This paper concerns the design of robust controller for a linear system with time-varying state and input delay. The new adaptive sliding mode control algorithm of the system with multiple delays in system states and control inputs are proposed. The delay dependent conditions of the closed loop system are formulated and the equivalent gain of the adaptive sliding mode controller is obtained in the form of linear matrix inequalities (LMI). Finally, simulation results of a numerical example based on a practical inverted pendulum shows both the feasibility and efficiency of the proposed controller.
Multi Fractal Characteristic of Metal Material Worn Surface with Plant Abrasive
Authors: Wan Fang Xin , Huang Xiao Peng , Wu Jing Feng , Huang Jian Long
Published: October 2014

Based on the multi-fractal theory and SEM image, the multi-fractal property of the plant abrasive to metal surface was studied. The result shows that the characteristic parameters of △α and △f of the multi-fractal spectrum on can reflect the morphology features of the worn surface, which are connected with volume wear, so they are regarded as characterization parameters in quantification on the surface of metallic material that is worn by plant abrasive. 15 mm.
Fuzzy Controller for Semi-Active Automobile Suspension System under Random Profiled Road Input
Authors: Ma Qi Hua , Luo Jing , Zhang Chun Yan
Published: October 2014

The suspension system is one of the most important parts of the automobile. The suspension system has an important influence on the ride comfort and maneuverable stability of the automobile. As structure parameters of traditional passive suspension cannot adaptively change with external conditions, the improvement of dynamic performance is difficult. Tow-DOF and four-DOF suspension of vehicle model is set up in this paper. Under random profiled road input simulated by using Runge-Kutta method, the control laws of fuzzy controller are adjusted by using different weight coefficients and use Matlab software to simulate the performances. Then, the results are compared and the performances are analyzed between passive suspension and semi-active suspension. The simulation results show the semi-active suspension is more effective for decreasing the vibration of vehicle body than the passive suspension, and designed fuzzy controller is effective for controlling the active controller of the semi-active suspension.
Realization of Rotorcraft Control Based on Hybrid Fuzzy Controller
Authors: Sun Yan , Wang Ding , Fang Yuan , Qi Feng Hua
Published: October 2014

This paper achieved the realization to apply a hybrid fuzzy control algorithm to control the rotorcraft, which can it fly stably, load heavy things, carry easily and complete complex flight movements. The operation show that control system is effective and valuable.
Research on Distribution Regularity of Nano-Sized WC in Cast Steel
Authors: Han Yang , Zhang Ai Ling , Yang Lin , Han Ya Ling
Published: October 2014

The microstructure of 40CrNi2Mo steel matrix strengthened with wear resistance alloy is observed by the optical scope, SEM with EDS and FESEM. Analysis emphasis is lied on the distribution regulation of nanosized WC particulates in the microstructure of the steel matrix. Experimental results show that the method of adding wear resistance alloy in steel matrix can avoid gravity segregation phenomenon effectively and guarantee a uniform distribution of WC in steel matrix. nanosized WC particulates distributing evenly in steel matrix improve the wear resistance, and make microstructure of the steel matrix more uniform, finer and denser proved by its high-expansion micrograph.
The Design and Realization of Ship Power Management System Based on Modbus
Authors: Huang Jin Ming , Zhang Xiao Bo
Published: October 2014

In order to supervise and control the ship power system remotely and automatically, the automatic monitoring system is designed based on Modbus protocol. The system realizes unattended and long-distance concentrate supervision and control of power system, and it manages power automatically. The system has the ability to improve the automation level and to reduce labor intensity.
The Simulation Research of 5KVA/400Hz Medium Frequency Power Supply in Matlab/Simulink
Authors: Wang Gui Xin , Zheng Shuai , You Wen Juan , Zhou Zhe Heng , Li Yang
Published: October 2014

This paper built 5 KVA / 400 Hz medium frequency power supply AC - DC - AC main circuit, Output filter is designed in detail. Based on SPWM control strategy and the voltage RMS feedback loop and PI adjustment, the Matlab/Simulink simulation model is established, and Harmonics are analyzed, the conclusion is obtained.
A Design and Implementation of Bootloader Based on MPC8280
Authors: Wang Ling , Chen Xin
Published: October 2014

The core unit of the flight control system being the central part of the Unmanned Aerial Vehicle (UAV) system is the flight control computer playing a vital role in the stability and security of the entire system, which has fast and reliable requirements for system startup. Bootloader is the first section of software code that runs after powering on, mainly responsible for initializing hardware devices. By loading an application or operating system kernel, the bootloader completes the system startup. Based on MPC8280 processor’s hardware platform of the central processing unit of distributed flight control computer, this paper designs and implements a non-operating system boot scheme. Under the boot scheme, an optimal boot scheme aiming at increasing efficiency of software development for VxWorks operating system is provide.
Simulation of Fiber Orientation in Dumbbell-Shaped Injection Cavity
Authors: He Hong , Chen Xiong Bing
Published: October 2014

Understanding rules of the distribution of fiber is important to control the mechanical properties of composite material performance. Fiber orientation in dumbbell-shaped injection cavity is different from that in regular cuboids because of its complex shape. Fiber orientation equation, Fokker - Planck equation was solved by the finite volume method and the errors brought by approximate method were avoided. The calculation results verified demonstrated that the shape of injection cavity affected the fiber orientation. In the flow direction, fiber of the shrinkage zone oriented along the flow direction and of the dilation zone oriented along tensile direction which is vertical to the flow. In cavity thickness direction, fiber orientation was layered.
Optimization Maneuver Strategy which Make the Loss of Height of UAV Minimum after Engine Stopped
Authors: Wang Kai , Sun Chun Zhen , Jiang Yi
Published: October 2014

This paper researches optimization maneuver strategy of UAV after engine stopped to make the loss of height of UAV minimum. Research has been done in two conditions, unpowered balanced glide straight flight and unpowered balanced glide turn maneuver. In this paper, the angle of attack and angle of roll has been given in order to make sure that the loss of the height is a minimum. The results of the simulations show that the optimization maneuver strategy in this paper is correct.
An Integrated Fault Phase Selection Scheme for Double Circuit Lines on the Same Tower
Authors: Tian Shu , Liu Fang Fang
Published: October 2014

For double circuit lines on the same tower, traditional phase selectors for single lines can not operate correctly in crossing-line faults. To ensure the performance of faults phase selection in the single lines and meanwhile achieve accurate phase selection in crossing-line faults, an integrated fault phase selection scheme based on fault component current is proposed. Firstly, faults are divided into single lines faults, same-name-phase crossing-line faults and non same-name-phase crossing-line faults, then the phase selection is classified. The process with adaptive capacity can automatically select the suitable phase selector not affected by fault types. Simulation results via PSCAD/EMTDC show that the phase selection scheme based on fault component current has good performances for different fault types, fault location and transition resistance.
Study of the Mechanical Properties of Ceramics Modified Composite Insulator Materials
Authors: Liang Pei Song , Liang Ying , Liu Yun Peng
Published: October 2014

A large number of ceramic insulators that are widely used in the power systems are returning shipment every year but there is no better processing method. Silicone rubber insulators have highly required the additive of the formulation. So this article combining the advantages of ceramic insulators and chemical composition, studies the mechanical properties of ceramics modified composite insulator materials. The measurements include the tensile strength, tear strength, hardness, SEM and Fourier transform infrared spectroscopy test of the new silicone rubber. The effects of adding different proportions of ceramic powder on the mechanical properties of silicone rubber are compared. And from the microscopic analysis the mechanism of the improved properties of the modified silicone rubber is analyzed. The results showed that a proportion of the ceramic part can replace aluminum hydroxide powder and the fumed silica powder can significantly improve the mechanical properties of the silicone rubber.
Study on Optimal Location of Multiple-Type Power Quality Improving Devices
Authors: Sun Tian Tian , Ma Wen Zhong , Feng Xing Tian
Published: October 2014

This paper presents a novel method for optimal location of multiple-type power quality improving devices in distribution network through lots of simulations in IEEE 30 bus system. Three type devices have been considered, active power filter (APF), dynamic voltage restorer (DVR) and static synchronous compensator (D-STATCOM). Using proposed method, configuration is fulfilled according to a certain order and their own law. Results show this strategy is an effective method to find optimal locations for power quality improving devices with lower cost.
The Optimal Research on Impeller Central Location of Centrifugal Fan
Authors: Lv Yu Kun , Zhang Bo , Cheng Bo
Published: October 2014

Taking the G4-73№8D centrifugal fan as research object and utilizing the software of NUMECA to simulate flow fields of volutes with different radial relative positions, the optimum central location of the fan impeller was obtained. The contrastive analysis of internal flow field which of the original and impeller center location optimization fan was under the rated and variable condition, showed that the optimized fan enhanced impeller and volute casing radial adaptive and the efficiency and export static pressure of optimized fan were improved.
Typical Insulation Defects Partial Discharge Feature Extraction Research Based on AE Method
Authors: Lv Fang Cheng , Jin Hu , Zhang Zhao Hua
Published: October 2014

Gas insulated switchgears (GIS) occupy an important position in the power system. Feature extraction is the key to GIS partial discharge pattern recognition, but the dimension of feature space is high, based on this, the article introduce the principal component sparse thoughts, firstly, through the 252 kV GIS partial discharge simulation experiment platform, set up the typical GIS partial discharge models, and uses AE method to obtain the signals, and through the principal component contribution rate to decide the degree of sparse, and according to the sparse component and the number of original features to decide the characteristics of related components, the results show that using this method can realize effective extraction of characteristic, and enhance the clustering results.
Design of Digital Clock Based on SCM
Authors: Qiao Shi Quan , Zhang Xiu Qing , Yang Meng , Chen Shu Wang
Published: October 2014

The digital clock is the timing device by using of the digital circuit to implement the digital display for hours, minutes and seconds. Due to the development of the digital integrated circuit and the wide application of the quartz crystal oscillator, the accuracy of the digital clock is far more than the old clocks’. The control part of the design is SCM AT89C51, and the compiler environment is Keil. The software is developed with C language, and the simulation debugging is used Proteus. The digital clock is convenient to people’s production and life, and it expands the original time function of the clocks greatly. Development trend of electronic instrumentation, and has broad market prospects. The clock can be used in many fields, such as the timing automatic alarm, the automatic schedule bell, the time program automatic control, the regular radio, the automatic lights close, the oven timer switch, etc.
Research on Front Lighting System of Automobile
Authors: Guan Xiu Li , Xing Xiao Xue , Lei Yan Min
Published: October 2014

Front-Lighting system of intelligent automobile can automatically provide the shape of lighting which is needed by car in present situation. Adjust and control the shape of lighting in bend. It can take different actions and automatic adjustment to the changes of vehicle driving, according to the road condition, time interval and weather variation .and thus it can realize the control. The paper introduces the AFS system structure diagram, working principle, and working process. It plays an important role in running safety at night.
Fabrication of FBG Strain Gauge Used for High Temperature Strain Monitoring
Authors: Zhang Shao Jun , Liu Yue Ming
Published: October 2014

Fiber Bragg Grating (FBG) sensing technology is widely used in detection of temperature, strain and etc. Now the application of FBG sensor is limited below 200°C. Application over 200°C is still an engineering challenge since no suitable FBG strain gauge. In this paper, FBG strain gauge structure which consists of three FBGs is designed and fabricated based on the theoretical strain and stress analysis. This strain gauge can be used for the real-time high temperature strain monitoring situation. The elastic high-temperature alloy (10MoWVNb) is chosen as the substrate. The three FBGs with a similar performance are fabricated on the substrate by high-temperature glue. Among the three FBGs, FBG1 is used for the horizontal strain monitoring, FBG2 is used for the longitudinal strain monitoring, and FGB3 is used for high temperature cross-sensitive compensation. The fabricated high temperature FBG gauge is demonstrated suitable for high temperature strain monitoring by experiment.
Study on Band Gap Varying of Diamond Photonic Crystals by Fabricating to Bring the Error of Dielectric Volume Fraction
Authors: Chen Shi Bin , Yao Yun Shi , Li Xiao Hui , Wang Min Jie
Published: October 2014

To avoid the effect of the error of dielectric volume fraction brought by fabricating process on band gap, the diamond crystals with different the error of dielectric volume fraction were designed and fabricated to investigate the fluctuation of band gaps. Theses photonic crystals with a diamond structure were fabricated using alumina by stereolithography, gel-casting and sintering. The photonic band gaps were observed along <100> direction and the photonic band gaps were formed in different frequency range. Increasing the radius from 4.2mm to 4.32mm and changing band width from 0.8 to 1.39GHz, the radius is increased by 2.86%, and corresponding band width increased by 73.75%. Therefore, the fabrication error in mold and fabrication process including injecting mold, sintering should be maintained under the same conditions, which can retain the error of band gap.
Study on Size Selections of the Ten-Needle Inline Nozzle Structure
Authors: Li Xiao Yang , Yuan Hong Jin , Zhang Lin Lin
Published: October 2014

The main objective of this study is to select the reasonable parameters for the ten-needle inline nozzle structure. Its internal flow fields were simulated by using FLUENT software. Quadrature calculations are conducted according to different inlet flow, different diameters and different lengths of the needles. The partial flow and drift rates under different inlet fluxes were analyzed. Through curve fitting method, the size ranges of the optimal structure under different conditions are obtained.
A Continuum Damage Mechanics Approach for Fatigue Life Prediction of Open-Hole Metallic Plate
Authors: Chen Xian Min , Sun Qin , Guan Di , Yang Feng Ping
Published: October 2014

A damage evolution model is presented for fatigue life prediction of metallic structures. This model is formulated based on damage mechanics and the irreversible thermodynamics framework developed by LEMAITRE and CHABOCHE. Using this model, the fatigue lifetime can be predicted both in the high cycle fatigue (HCF) regime and the low cycle fatigue (LCF) regime. Based on the energy theory and material fatigue test data, the plastic strain threshold for damage initiation was modified for HCF and LCF respectively. The damage evolution parameters were determined according to the fatigue test results of standard specimens. A damage mechanics-finite element full-couple method was adopted to simulate the process of fatigue damage evolution. The numerical simulation of fatigue lives were compared with the fatigue tests of 2A12-T4 open-hole plates and good agreement was obtained.
Creep-Fatigue Life Prediction for Aeroengine’s High Temperature Component
Authors: Xia Yi Rui , Dai Jing Tao , Sun Zhong Yun
Published: October 2014

In this paper, the key technique involved in life prediction of aeroengine’s high temperature component for creep and fatigue/creep interaction, namely, the life prediction methods for high temperature component are discussed systematically. The essential thinking、features and development direction of the theories are commented in detail. All the results obtained are valuable to engineering applications.
A Two-Dimensional Square-Lattice Photonic Crystal with Rotated Square Cylinders and Cross Thin Plates Exhibiting Wide Photonic Bandgap
Authors: Wen Guo Hua , Ouyang Zheng Biao
Published: October 2014

A new type of two-dimensional square-lattice photonic crystal structure made of rotated square cylinders and cross thin plates is presented and numerically investigated using the plane-wave expansion method. The largest absolute photonic bandgap (APBG) reaches 14.3%. The proposed structure can have promising application for its large APBG and convenience in designing optical circuits.
Optimization of Sound Package for Automotive Dash Panel
Authors: Du Ai Min , Wei Na , Shao Jian Wang
Published: October 2014

The design of automotive trim configurations has become increasingly driven to maximize the acoustic performance benefit while minimizing material weight. Statistical energy analysis (SEA) can serve as a useful tool to predict the high frequency acoustic response on both a component and full vehicle level. This paper focuses on the automotive dash panel, using VAOne software to establish the SEA model. The method of orthogonal test is applied to optimize the sound package design to satisfy maximum high-frequency transmission loss (TL) and minimum weight by modifying the acoustic material, thickness, surface density and coverage of sound package.
Seismic Analysis for Axial Fan Used in Nuclear Power Plant
Authors: Xu Wen Bing , Xiang Wen Yuan , Lv Yong Hong , Lu Guang Yao
Published: October 2014

The seismic performance of the axial fan used in nuclear power plants (NPP) is investigated by using the commercial FEM software ANSYS. In the modal analysis, the first five orders of the natural frequencies of the axial fan is obtained, as well as the corresponding vibration modes. And in the spectrum analysis, the complete quadratic mode combination method is applied to determine the dynamic response of the axial fan under a random seismic excitation. The simulation results show that the seismic performance of the axial fan satisfies the requirement of the RCC-M 2007 design codes.
Study of On-Line Monitoring Device for SF6 Humidity
Authors: Yang Hui
Published: October 2014

On-line monitoring device for SF6 humidity based on ZigBee was composed of processors, signal conditioning units (SCU), data-collection devices, ZigBee wireless network communication technology, control equipment of ventilation and alarm and powering circuits. Data information of humidity, temperature and pressure of SF6 gas can be monitored by the device. The application of information blending technique decreased the error of measuring, and achieved auto-calibration of measurement systems, compensation of measured data and signal output control, and improved precision of the reliability of measurement, and extended the service life.
Development of a Wearable Biosensor System for Ubiquitous Healthcare Applications
Authors: Dai Ming , Wang Qi , Wu Wan Qin
Published: October 2014

With the development of wearable computing, wireless communication and artificial intelligence technology, the physiological monitoring systems for homecare applications achieved more and more attention. It is a challenge to design a fully integrated circuit satisfying the requirements of wearable biosensor system, such as small size, low power consumption, wireless transmission, and high signal noise rate (SNR). Based on these considerations, we recently developed a fully-integrated circuit for a wearable biosensor system to measure multiple vital signs in real time, meanwhile, we adopted FIR notch filter to remove the 50Hz power line interference and used cubic spline interpolation to reduce baseline drift noise. The experimental results showed that this wearable system ran well, which could be applied for real-time and ubiquitous healthcare in daily life.
Characterisation of Low-Temperature Co-Firable Green Tapes for Making Fused Silica Laminated Composites
Authors: Miao Xi Geng , Shi Yu Yuan , Zhu Wen Jun , Luan Lin , Ji Chun Lin
Published: October 2014

For achieving high-temperature resistance and a broadband of microwave transmission, ceramic metamaterials consisting of fused silica ceramic substrates and electrically conductive networks/ arrays are desirable. A new strategy of fabricating the fused silica metamaterials is to combine the low temperature co-fired ceramic (LTCC) technique with a method of ceramic joining via green tapes. The important part of the new strategy lies in the preparation of suitable green tapes that are co-firable with a conductive silver-based film/strip and have a strong affinity to the fused silica substrates. Therefore, in this paper, three green tape materials were prepared and intensively characterised using scanning electron microscopy, x-ray diffraction, dilatometry, dielectric measurement, etc. It was found that the tape materials were based on dielectric glasses and crystalline phases of major eulytite and minor cristobalite, leading to rather low levels of dielectric constant (<6) and loss tangent (in the order of 10-3). The three tape materials also had different levels of thermal expansion coefficients, co-firability with a conductive silver-based paste, and bondability to the fused silica substrates. These findings suggest that one can achieve desirable ceramic matematerials with well-controlled shapes and dimensions of the condutive networks/arrays after properly laminating the green tapes between the fused silica substrates.
A Nonlinear PID Controller with a Tracking Differentiator in the High Precision Servo System
Authors: Zhou Tao , Li Ling , Jia Lei Lei
Published: October 2014

Classical linear PID controllers have such disadvantages as the derivative signal unable to be used owing to the noise amplification effect, and the contradiction between the more swiftness and less overshoot. We develop a practical nonlinear PID controller based on a tracking differentiator (TD) in the high precision servo system of the three-axis flight simulator, which could eliminate above disadvantages. The nonlinear PID controller adopts the tracking differentiator to arrange the response process and produce the ideal derivative signal of the reference signal. We use a nonlinear combination function of the error proportional, integral and derivative item in the PID controller. The simulation results in Matlab Simulink demonstrate that the nonlinear PID controller makes the flight simulator servo system with the friction disturbance realize the higher position tracking precision and velocity tracking precision. The nonlinear PID controller with the TD is superior to the classical PID one in control performance.
The Analysis of Static Pose Error for a Multi-Joint Climbing Robot
Authors: Wang Lei , Huang Xue Liang
Published: October 2014

The research object was a 5-joint climbing robot in series, whose structure consisted of the body links and two symmetrical end-claws. The analysis theory of industrial robots was proposed to make systematical research on the static pose error. The kinematics model of static pose error is established, according to the kinematics D-H theory. Set the claw fixed on the climbing target as the base, and then the motion was transmitted to the other claw by the 5 joints. The equations of static pose error were derived. Calculations and analysis were made in MATLAB providing the theory reference to the research on error compensation and controlling. The results indicate that angle parameter error has great affect on the end-pose error of the robot which is in proportion to the angle parameters, so measures to reduce the angle parameter error need to be made to improve the precision of robot.
The Study of Compensation Method to Numerically-Controlled Machine Tool Geometrical Error
Authors: Wang Lian Bing
Published: October 2014

In this paper, the cause of nc machine tool geometric error made a more detailed analysis, the system error compensation methods are summarized, and on this basis this paper expounds the applications of all kinds of error compensation method, in order to further realize the accuracy of machine tool software upgrade to lay the foundation.
Study of a Novel Power Distribution System Oscillation Model Based on Multi-Agent System
Authors: Teng Yun , Hui Qian , Yu Ji Bo , Liu Zheng , Zhang Yong Gang
Published: October 2014

To improve the effect of existing inter-area oscillation control system in wide area network and multi-Agent system, the paper presents the control collaborative model of the inter-area oscillation based on multi-Agent and PMU for solving the problems presently such as centralized control and delay of wide-area power system in the control mode of the inter-area oscillation. It designs the monitoring strategies of three-level PSS signal, presents the collaborative process of suppressing the inter-area oscillation based on this model, and finally indicates the feasibility and effectiveness of the constructing the inter-area oscillation control system based on multi-Agent system by the digital simulation.
Hybrid Flow-Shop Scheduling Method and Simulation Based on Adaptive Genetic Algorithm
Authors: Zhao Jian Feng , Zhu Xiao Chun , Wang Bao Sheng
Published: October 2014

The n-job, k-stage hybrid flow shop problem is one of the general production scheduling problems. Hybrid flow shop (HFS) problems are NP-Hard when the objective is to minimize the makespan .The research deals with the criterion of makespan minimization for the HFS scheduling problems. In this paper we present a new encoding method so as to guarantee the validity of chromosomes and convenience of calculation and corresponding crossover and mutation operators are designed for optimum sequencing. The simulation results show that the Sequence Adaptive Cross Genetic Algorithm (SACGA) is an effective and efficient method for solving HFS Problems.
An Advanced Verification Platform Based on UVM
Authors: Wang Jing , Wang Fei
Published: October 2014

An advanced verification platfrom based on UVM architecture is implemented in this paper. This paper presents a hierarchical verification environment that is portable, reusable, and easy to extend, which is constructed based on an object oriented language named System Verilog. The verification platform is applied to verify a RFID (Radio Frequency Identification) tag chip which is compliant with the ISO/IEC15693 standard, communicates with a reader outside through a RF analog circuitry, completes anti-collision flow, selects card, authenticates based on SM7 algorithm and controls the writing and reading of EEPROM inside. According to the instruction supported by the tag chip is wide and variety, and further more it’s very rich in the command frame contents, the advanced verification platform which achieves the constraint-random stimulus generation, functional coverage and self-check mechanism, reduces the verification cycle, improves verification efficiency and ensures verification adequacy.
Theory and Technology Research on the Software Health Management
Authors: Zhang Hui Qi , Li Qiu Ying , You Hang Chao
Published: October 2014

The software health management (SWHM) is a new field, which mainly deals with some critical need to detect, diagnose, predict and mitigate adverse events caused by software related faults and failures. These faults come from different sources such as code errors, unpredicted faults, hardware failures or some problematic interaction with the external environment. This article discusses the latest development and research of software health concept and techniques. And the article summarizes the problem of current research, and proposes the developing trend. At last, we explain the process of software health monitoring taking the service software system as example.
A Novel Influence Measure Algorithm for Social Networks
Authors: Du San Shan , Wu Yue Chun
Published: October 2014

As the development of communication, social networks are becoming increasingly ubiquity nowadays. The reliable measure of the influence of each individual has a great significance. Better decisions can be made according to the influence ranking in a social network. In this paper, we introduce the time series into PageRank and propose an improved influence measure model. Experiments on the Erdos1 coauthors network and the bloggers network both achieved reliable results.
Scheduling Jobs on Batch Machines Based on Ant Colony Algorithms
Authors: Huang Xia Bao
Published: October 2014

Scheduling jobs on batch machines has a significant impact on the performance indicators utilization. We used ant colony algorithms to improve performance of the scheduling jobs on batch machines in the semiconductor fabrication with multi-priority orders. To minimize total tardiness penalty, the improved ant colony algorithms was used to perform batches forming and batches sorting respectively, which are the two sub-problem of batch machines’ scheduling. The simulation results show that the scheduling performance by our proposed algorithm is better than the heuristic rules, and the more percentage of emergency orders, the better it is.
Research and Implementation of Practical CAPP Database
Authors: Jiao Ai Sheng , Xie Juan Wen , Yan Hui Ping , Shen Jian Cheng
Published: October 2014

According to oriented business application of CAPP, how to develop the CAPP system which is practical and instrumentalized to the enterprises through create the database is discussed, and the superiority of data processing of the system and the practical value of its own is verified.
A Class of Hyperspace Systems and Distributional Chaos
Authors: Wang Wei , Zhu Xiao Gang
Published: October 2014

Research on dynamical system has penetrated into many problems of agricultural production, such as prediction of corn yield, analysis on operational situation of irrigation district and research on ecological difference equation. In this paper, we investigated dynamical properties for non-primitive substitution and the set-valued maps induced by the substitution. We proved In two cases that the hyperspace systems induced by non-primitive substitution are not distributional chaotic.
The Rule of Law and Acquisitions and Risk Prevention in the Process of Cross-Border Mergers
Authors: Liu Wen , Xu Li
Published: October 2014

With the deepening of economic globalization and China's reform and opening up, many outstanding enterprises in China to own a certain amount of funds available to invest overseas acquisitions, hopes to get their own competitiveness improvement through overseas acquisitions. Cross-border mergers and acquisitions is the capital operation of a high-risk activities, enterprises will face risks in various areas such as decision-making, finance, information , law. Circumvention of legal risks is the key to the success of cross-border mergers and acquisitions of enterprises. The author analyzes an overview of the legal risks in cross-border mergers and acquisitions of Chinese enterprises, the characteristics and performance of the way, and thus how to avoid risks form the external environment and internal strategic countermeasures.