bluuebunny/crossref_metadata_2025 huggingface dataset:
Big Data Sensing Information Processing Platform for Intelligent Traffic
Authors: Tang Jin Peng , Li Ling Lin
Published: October 2014

Analysis of the intelligent traffic service platform system structure and key technology of cloud computing, proposed mass sensing information processing scheme based on the intelligent traffic service platform. First the scheme proposed system architecture, designed a multiple functional unit modules of the system, through the combination of these functional unit can realize the configured service for tens of thousands of service and tenants. Then, the system adopts Hadoop open source framework for distributed computing. Finally, the system is realized in the intelligent transportation service.
Realization of Email Address Register Validation on Engineering Machinery Service Platform
Authors: Fu Jie , Wang Qiu Feng , Zhao Hai Ming , Xu Xuan Hua , Xia Yi Min
Published: October 2014

This paper describes the Realization of ASP.net technology on Engineering Machinery Service (EMS) platform, based on environment of Visual Studio 2005. The EMS platform is designed to keep the accuracy of users’ information when registering as well as to filter malicious users who register with fictitious information. During the register process, EMS platform realizes the validation function of Email address which can provide better protection for the website and also inform users of precise information.
A CMOS Bandgap Reference with Temperature Compensation
Authors: Chen Xi , Li Liang , Huang Xing Fa , Shen Xiao Feng , Xu Ming Yuan
Published: October 2014

This paper has presented a bandgap reference circuit with high-order temperature compensation. The compensation technique is achieved by using MOS transistor operating in sub-threshold region for reducing high-order TC of Vbe. The circuit is designed in 0.18¦Ìm CMOS process. Simulation results show that the proposed circuit achieves 4.2 ppm/¡æ with temperature from-55 to 125 ¡æ, which is only a third than that of first-order compensated bandgap reference.
Research on the Vision Control System for Modular Robot
Authors: Tang Jian Bing , Zha Ya Bing
Published: October 2014

Modular robot is an approach to build the robot for various complex tasks with the promise of great versatility, robustness and lower cost. It can be used extensively to meet the demands of different tasks or different working environments by changing its shapes. Therefore, they can travel over or through obstacles, and go though small pipe. Even they can walk somewhat like a person on crutches. It is a key technology that how modular robot with vision to capture exact image information, as well as to extract the feature parameters of components real-timely, to recognize the component types, and to judge the position and posture of component. The quantity of the motion pattern will decide the adjustable ability of modular robot. So, dynamic vision control system is very important for modular robot, which can improve its moving ability and intelligent degree. With the help of the dynamic vision control system, the robot can accomplish different tasks in different working environments by itself, such as deciding routes and avoiding obstacles. In this paper, in order to improve the vision of modular robot, a kind of dynamic vision control system is analyzed and researched roundly, and two kinds of motion patterns for the modular robot are put forward.
An Improved Independent Component Analysis with Reference
Authors: Jia Yan Fei , Yang Xiao Dong , Xu Li Yue , Zhao Li Quan
Published: October 2014

Independent component analysis with reference is a general framework to incorporate a priori information of interesting source signal into the cost function as constrained terms to form an augmented Lagrange function, and utilizes Newton method to optimize the cost function. It can extract any interesting source signal without extracting all source signals comparing with the traditional Independent component analysis method. In this paper, to accelerate the convergence speed of the Independent component analysis with reference, two improved algorithms are presented. The new algorithms, firstly whiten the observed signals to avoid matrix inverse operation to reduce algorithm complexity, secondly use improved Newton method with fast convergence speed to optimize cost function,in the end deduce the improved Independent component analysis with reference algorithms. Simulation result demonstrates the new algorithms have faster convergence speed with smaller error compared with the original method.
An Image Retrieval Algorithm Base on Texture Features
Authors: Song Lin Lin , Wang Qing Hu , Pei Zhi Li
Published: October 2014

This paper firstly studies the texture features. We construct a gray-difference primitive co-occurrence matrix to extract texture features by combining statistical methods with structural ones. The experiment results show that the features of the gray-difference primitive co-occurrence matrix are more delicate than the traditional gray co-occurrence matrix.
Automatic White Balance Algorithm of Airborne Camera
Authors: Guo Hui Nan , Liu Qing , Yang Lei , Wang Hua , Zhao Xiao Dong , Ren Long
Published: October 2014

Automatic white balance algorithm (AWB) is significant for color temperature restoration of digital imaging system. According to the limitations and disadvantages of existing traditional white balance methods, in this paper a new AWB algorithm for airborne camera is proposed. Using RGB and histogram information divide the input image into different color character regions; according to the color richness level, adopt different white balance algorithms to achieve chromatic aberration adjustment. Experiment results show the effectiveness of the proposed AWB algorithm for airborne camera.
3-dB Radiation Beamwidth Adjustment for E-Shaped Microstrip Antennas
Authors: Zhang Geng , Gao Chi , Weng Zi Bin
Published: October 2014

This paper introduces a simple, E-shaped slot loaded wideband microstrip patch antenna with a metallic cavity. The antenna design is an improvement from previous research and it is simulated using HFSS 13 software. The performance of the designed antenna was analyzed in term of bandwidth, gain, VSWR, and radiation pattern. What does the substrate use is air. The results show the wideband antenna is able to operate from 190MHz to 230MHz frequency band with optimum frequency at 210MHz, and the 3-dB radiation beamwidth of the E and the H plane at the 210MHz are 61° and 51°. However, the 3-dB radiation beamwidth of the E and the H plane at the 210MHz can be adjusted to 70° by using a metallic cavity.
Algorithm Design of the p-Cycle Protection Applied to SDN Based on OFDM Transmission
Authors: Zhao De Zhi , Li Xing Ming , Liu Shun
Published: October 2014

This Paper based on the research framework ofSDN, at the transport layer uses theOFDMtechnology transfer, namely encapsulate traffic for high speed large capacity transmission in the spectrum. Under the architecture ofSDNbased on p-cycle of new protection algorithm (EffectiveGrow algorithm) to protect spectrum, and using classic p-cycle algorithm turns compare with it, through theJAVAbuilding the pan-europeanCOST239network topology, comparison algorithm between the various performance indicators. Finally, the simulation results show that compared with the existing classic algorithm has better performance and is suitable for theSDNcapacity and configuration.
A Novel Tyre Force Distribution Method for Four-Wheel Independent Driving Vehicles
Authors: Li Chang Lin , Wang Jin Xiang , Chen Nan
Published: October 2014

This paper discusses an optimal algorithm for distributing tyre force by an analytical multiplier penalty function method with which the maneuverability and stability of the four-wheel independent driving vehicles can be improved. Based on hierarchical method, the controller is divided into the upper level and lower level one. In the upper level controller, the yaw moment is calculated by sliding control to track the desired yaw rate. In the lower level controller, the analytical multiplier penalty method is utilized to distribute the yaw moment to tyre forces according with equality constraints of yaw and longitudinal acceleration. Simulation was conducted with Matlab/Simulink and Carsim. Simulation results show that the proposed method is effective.
The Modeling and Solutions of the ‘Adaptive Living’ Based on Network Calculus
Authors: Wang Shuai , Zhu Lei , Chen Yan De
Published: October 2014

While solving problems concerning routing selection, admission control, and service flow QoS guarantee etc., researchers are required to analyze the network and solve the QoS performance metrics. To address the requirements rising from different network problems, this paper is trying to build a model of the network node ‘adaptive living’ and to find solutions by network calculus. This model reflects the real-time service capability of network node as adapting to the change of environment, the change of network topology and service need. In the future, it can be widely used in solving problems of network performance analysis.
Performance Evaluation of Near Space System for Information Process Based on Multilayer Gray Model
Authors: Wang Jun Xiang , Yang Feng , Pan Quan
Published: October 2014

In recent years, near-space platforms become a major military power of research. Performance evaluation of System for a comprehensive optimization design has a very important role. For the current network-centric warfare environment information superiority significant impact on system performance, it establishes a whole process of near space information system performance evaluation index system. For the assessment of near space multi-level system performance, complexity, and other characteristics, a kind of multi-level gray comprehensive evaluation model phased approach is proposed. Using the approach for performance evaluation of near space system in information operations phase for example verifies the practicality.
MEPDG Analysis on Relationship between Design Inputs and Performance of Asphalt Pavements
Authors: Zhang Hong Bo , Hou Jing , Liu Yu , Xuan Da Fa , Fan Wei Min
Published: October 2014

The main objective of this research is to explore the quantitative relationship between the pavement design parameters (structural layer thickness, voids, aggregate gradation and temperatures) and pavement performance parameters (rutting, cracking and IRI). The Mechanistic-Empirical Pavement Design Guide (MEPDG) was used and the analysis was performed on pavements under three temperature conditions namely the intermediate temperature zone (Zhengzhou in Henan Province), the low temperature zone (MOHE in Heilongjiang province) and the high temperature zone (Turpan in Xinjiang province). It was observed that 1) Pavement performances (rutting and cracking) were significantly impacted by layer thickness values until the values were larger than 14 inch; 2) Air void content influenced on not only predicted pavement rutting but also the thermal cracking.
Gait Trajectory Planning Based on Least Squares Fitting - Polynomial for Lower Extremity Rehabilitation
Authors: Cao Fu Cheng , Du Li Min
Published: October 2014

According to the analysis results of normal gait data, a method of gait trajectory planning based least squares curve fitting is proposed. Given the generalized-th order polynomial functions, the coefficients for functions are determined, then, a health hip and knee gait trajectory planning functions were obtained. The computer data analysis results show that the gait trajectory fitted can represent a normal gait accurately.
Study on the Product CAPP-PPC Process Based on Productibility
Authors: Chen Yan Hai , Li Hai Feng , Xu Jing , Qiu Fu Sheng , Wang Gong Dong
Published: October 2014

In order to make a rational planning of CAPP-PPC process, the differences of product serial and concurrent CAPP-PPC process were studyed in this paper. Based on Witness, Three kinds of product serial and concurrent CAPP-PPC process simulation model were established for products with different complicated degrees. Simulation results show the time of concurrent process is much shorter than serial process, for complex products, especially obvious.
Seismic Analysis and Redesign of the Center Row in Reactor Core
Authors: Huang Mei , Zhao Yuan Yuan , Xing Zhao Yang , Yuan Hao , Tang Jian Nan
Published: October 2014

In this article, finite element method is used to analyze the properties of the reactor core under seismic load, and redesign the center assemblies to resist deformation and impact force. The result shows that the maximum force on the lug boss is decreased while the springs are applied.
The Numerical Simulation of Swirl Jet Characteristic
Authors: Lv Yu Kun , Li Zhi Chao , Wu Pei Xin
Published: October 2014

This paper studied the velocity distribution of swirling jet through employing the Fluent software to simulate the three-dimensional flow field of swirling jet. By compared the simulation results, the axial, radial, tangential velocity and non-dimensional distribution of swirling jet, and the effects of different swirl intensity on the dimensionless velocity and quantity of reflux can be obtained. Research shows the angular velocity is constant, and different swirl intensity dimensionless reflux along the axial section is similar, and so is the dimensionless velocity distribution.
Kalman Filter-Based Robot Manipulator Five-Degrees of Freedom Uncalibrated Vision Positioning
Authors: Liu Lang , Wang Niu , Yu Chu Zhong , Wang Da Tao
Published: October 2014

Robot manipulator position and posture control is a popular topic in the field of uncalibrated visual servoing, this paper presents a kalman filter-based robot manipulator five-degrees of freedom uncalibrated vision positioning method. In the case of the fixed binocular cameras and manipulator parameters are unknown; firstly, the specific point and angle image features information in the camera image space were selected in order to describe the relative pose relationship between robot manipulator ends and goals. Then, the kalman filter online estimation algorithm was applied to calculate image Jacobian matrix which is mapping relationship between image space to cartesian mission space, and vision controller was designed in the image plane realized robot manipulator five-degrees of freedom uncalibrated vision positioning control. Finally, Six-degrees of freedom robot manipulator’s five-degrees of freedom uncalibrated visual positioning Simulink model established in the Matlab environment, and the simulation result show that kalman filter online estimation method made the robot manipulator rapid convergence to the desired position and posture with high accuracy.
Research and Design of Auxiliary Power Supply for Motor Controller in Electric Vehicles
Authors: Huang Zhi Yu , Chen Zhi Fang
Published: October 2014

For the electric vehicle motor controller driver section requirements of the multiple isolated power supply problems, analyzed the common DC/DC converter, the single-ended flyback converter was selected as the motor controller auxiliary power supply. Taking into account the parasitic parameters of the high frequency transformer and switch transistor effects on the circuit, the loss model was showed. Its feasibility is verified by experiments. Experimental results showed that the designed RCD clamp circuit switch could effectively reduce stress and meet the requirements of the motor controller.
Rolling Bag Station Motor Decoupling Control Based on Multi-Agent on Automobile Safety Airbag
Authors: Zhang Niao Na , Wang Guo Liang
Published: October 2014

This paper based on multi-agent technology, according to automobile safety airbag roll bag station production technology, at first adopt TS fuzzy neural regression network to distributed modeling for the controlled object, the methods of combining supervision learning and reinforcement learning are used, according to multi-agent external reinforcement signals and the value function of evaluate network ,using adaptive genetic co-evolution algorithm to optimize the action network, so can adapt to the mutational environment, and engineering application supply the proof about the effectiveness of the control strategy.
Topological Map Building Based on Thinning
Authors: Wang Na , Wang Hai Yan , Zhu Qing Qing
Published: October 2014

In order to accomplish navigation and path planning, map building is the key technology and fundamental problem in mobile robotic control in unknown environment. In this paper the topological map is built based on the grid map by using a thinning algorithm. The environment is modeled in grid map, next the thinning algorithm is applied in the map, and then the effective topological information is extracted. Simulation results show that the topological map based on thinning is clear and succinct, and it also avoids producing unnecessary nodes and paths. This topological map stores much less information which will improve the ability of autonomous operation, navigation and path planning further.
Application of Fuzzy PID Controller on Mine Local Fan
Authors: Zhang Mei
Published: October 2014

Considering the feature of mine local ventilator, the paper proposed a kind of control method combined fuzzy control and PID control to local fan. According to the error and error change of gas concentration, the system automatically adjusted PID controller’s parameters, to having adaptive capability. The monitoring of gas concentration and frequency inverter speed control of fan can be made with the system using TMS320F2407 DSP as the core.
Preparation and Photoluminescence of Red, Green and Blue Fluorescent Dyes Co-Doped Nanoporous Silica by a Sol-Gel Method
Authors: Wang Jun Ling , Zhou Xu Liang , Li Zhuan , Liu Chun Mei
Published: October 2014

One sol-gel method is explored to prepare red, green and blue (RGB) fluorescent dyes co-doped nanoporous silica at low temperature in air. All of the dyes covers blue-emitting 2, 5-bis (5-tert-butyl-2-benzoxazolyl)- thiophene (BBOT), green-emitting Coumarin 152A (Coumarin) and red-emitting Lumogen red R305 (Lumogen), contributing to the photoluminescence (PL) of the hybrid. As a key factor, the molar ratio of reactants TEOS/Dioxane/ H2O is 3:12:4 during the sol-gel process. The maximum doping concentration of dyes is the result of dyes dispersing into nanoporous silica, which supported by Infrared Spectroscopy (IR) and X-ray diffraction (XRD) technology. So this sol-gel preparation can enrich the inorganic luminescent materials at a simple style, especially for PL materials or electroluminescent (EL) materials in thin films state.
PRI Control Methodology for Grid-Connected Inverters in Harmonic Distorted Grid Utility
Authors: Lin Hui Pin , Hu Jin , Wang Qun , Lu Zheng Yu
Published: October 2014

The impacts of grid voltage on grid current in distributed generation grid-connected inverters are analyzed, and a control strategy that can compensate harmonics and suppress DC bias is proposed. In comparison with traditional PR controller, the proposed PRI controller with an additional integral part obtains a higher gain in low frequency, and the controller has an apparent effort especially for suppressing DC bias. Finally the PRI controller is verified in a 50KW. The experimental results show that the PRI controller not only can reduce harmonics of grid current in the steady state but also can suppress DC bias rapidly in a dynamic process. The PRI controller is suitable for DGs since they typically contain low order harmonics which caused by nonlinear l three-level inverter loads.
Study on LVRT Decoupling Dual Synchronous Current Controller
Authors: Liao Tian Fa , Yi Chun Yang , Cai Zhao Quan , Dong Chang Wen , Shi Wei , Xue Jia Xiang
Published: October 2014

Under three-phase grid asymmetric fault conditions, use traditional PI controller of PV inverters to inject symmetric current positive sequence into the grid, ignoring the impact of the negative sequence current on LVRT, thus traditional PI controller does not apply to three-phase grid asymmetric faults. The paper proposes the decoupling dual synchronous current controller to reject positive, negative sequence current into the grid simultaneously and adopt positive and negative sequence flexible control to determine the active current reference and reactive current reference, avoiding the various drawbacks such as power control, totally positive sequence control bringing. Experiment verify the science and feasibility that decoupling dual synchronous current controller applies to asymmetric faults riding-through.
Asynchronous Operation Analysis of Brushless Doubly-Fed Machine with Magnetic Barrier Rotor
Authors: Zhang Yue , Ma Zhi Cai , Yu Hui Min
Published: October 2014

To restrain the influence of armature reaction, flux barriers is added to rotor structure and enhance the output power ability of brushless doubly-fed machine. Design scheme of brushless doubly-fed machine with barrier rotor is provided. Based on field-circuit coupled finite element method, The asynchronous operation performance of brushless doubly-fed machine with barrier rotor is studied under the condition of no-load, including adjusting voltage adjusting speed and series resistance adjusting voltage. The prototype is carried out on the condition of no-load asynchronous operation; comparison analysis of simulation speed values and tested speed values is realized. The designed machine is reasonable and reliable.
Development of a New Type of Distribution Network Fault Indicator
Authors: Li Fu Ling , He Xiu Ling , Li Yong
Published: October 2014

A kind of 10KV power distribution network fault indicator integrating measurement and communication functions was researched and developed. Used in 10KV power distribution overhead lines, this indicator is also designed with the communication module, current and temperature measurement module in addition to having the function of plate turning indication in case of grounding or short circuit fault. Through a wireless communication mode, the fault or measurement information is sent to the nearby data terminal unit, which sends the data to the monitoring center through the GPRS network. Workers will know the working status of the whole power distribution network in a real-time manner through the computer of the monitoring center. By adopting the ATmega8L MCU as the core, the new type of fault indicator realizes the wireless data transmission function through NRF24L01.
Distribution System State Estimation with Phasor Measurement Units
Authors: Liu Min
Published: October 2014

With phasor measurement units (PMU) become available in the distribution system; the estimation accuracy of the distribution system state estimation (DSSE) is expected to be improved. Based on the weighted least square (WLS) approach, this paper proposed a new state estimator which takes into account the PMU measurements including voltage magnitude and phasor angle, and load current magnitude and phasor angle. Simulation results indicate that the estimation accuracy is obvious improve by adding PMU measurements to the DSSE. Furthermore, the estimation accuracy changes with the installation site of PMU, and can be maximized by choosing the installation site appropriately.
Research on Looped Network Operation Scheme and Feasibility of Low-Voltage Distribution Network
Authors: He Xu Jie , Tong Xiao , Fu Hao , Jiang Tong , Wu Jian , Chen Hui
Published: October 2014

Distribution network is an important part of power system, the biggest feature of the structure is that the end of power network is directly connected to the users, demanding for safety and quality. This article introduces the low voltage distribution network operation theory, designs a low-voltage wiring mode, and by analyzing the disadvantages of this kind of connection, the optimal switching looped network operation is put forward; at the end of the low voltage distribution network flow calculation, by comparing the results of the loop closing operation with the open loop operation, the feasibility and advantages of loop operation is proved.
The Fault Diagnosis of Electric Power Metering System Based on Momentum BP Neural Network
Authors: Zhang Yue Yang , Zhao Jian Jun , Liang Wei
Published: October 2014

Momentum BP neural network is used to diagnose the fault of high voltage electric power metering system according to the advantage of strong self-adaptation. First of all, the information of 7 operation parameters of metering system is extracted as input values of the neural network, secondly, we collect samples to train and test BP network and use 4-bit binary number to represent the normal circumstance and 7 main fault types, The results show that the momentum BP network model is effective in the fault diagnosis of high voltage electric power metering system.
Broadband Transition between Rectangular Waveguide and Substrate Integrated Waveguide Based on Double Rhombus Antenna Probe
Authors: Jin Hai Yan , Yue Teng
Published: October 2014

The paper presents a design of rectangular waveguide-SIW transition, which provides a broadband and low insertion loss performance. The broadband transition is realized by using double-rhombus antenna probe inserted into rectangular metal waveguide. The transition is simulated and measured at 9-20GHz. The measured results show that a good agreement with simulation and an insertion loss less than 2.8 dB and a return loss better than 10 dB are obtained at 10–18.5 GHz for a back-to-back structure.
Research on On-Line Monitoring of Transmission Tower Stress
Authors: Wang Jin , Liu Zhi Xiong , Wu Zhang Qin , Ai Chuan
Published: October 2014

This paper studies the on-line monitoring system of transmission tower stress.Firstly, it introduces the necessary of this system, gives its system architecture. Then it presents an algorithm to determine the stress sensors' installation points on the tower, which based on finite element analysis. Through calculating the stress distribution condition of different components of the transmission tower under typical working condition, these points with relatively higher failure probability in the transmission tower can be monitored by installing stress sensors on them. Finally, it uses a 500kV oxytropis tower as an example to show the algorithm flow.
Boron Steel Nondestructive Testing Scheme Based on Neutron Radiation Detection
Authors: Zhu Guo Zheng , Liu Yang , Xing Zhen Ni , Luo Shao Bei
Published: October 2014

Boron steel nondestructive testing is of vital importance for the industrial production of boron steel plate to guarantee the product quality and production standards. This paper proposes a new kind of boron steel nondestructive detection scheme based on neutron radiation detection. We take advantage of the interaction between neutrons and boron steel media, to check whether the content of 10B in the product is qualified, uniformity meets the requirements, and whether there is a big flaw. Nondestructive testing scheme designed in this paper, using the neutron and 10B in boron steel plate has a larger reaction cross section. By receiving and counting the mount of neutron when they go through the stainless steel plate via neutron detector, we can conclude the reduction of neutrons and then calculated the content of 10B in products. This scheme sets polyethylene reflection at the bottom of the boron steel plate, on the one hand to strengthen the neutron count that the neutron radiation detector received by the reflection effect, on the other hand, can avoid defects like the opposite side receiving brings larger device volume, maneuver and others. This design provides a feasible technology and route for boron steel plate nondestructive testing.
The Study of Four-Position North Seeking System under Vibration Environment
Authors: Zong Ming Hui , Li Deng Hua
Published: October 2014

In order to develop north seeking system with strong anti-interference ability, the influence caused by the swaying base on the performance of north seeker was investigated. The influence of sinusoidal signal of gyros and tilt sensor's output was analyzed based on four-position north seeking system which was consisted of a single axis gyro and a tilt sensor. Fiber optic gyros and tilt sensor are interference by the same vibration signal, according to the relationship between the output signal of gyro and the angle sensor, a PI controller was designed to compensate the gyro's output error. This real time compensation can effectively improve the north seeking accuracy and speed without complicated calculation or external reference signal. The north seeking accuracy is better than 0.03o. Simulation and actual north seeking result proved that this method significantly improves the north seeking performance in vibrant environment.
Rehabilitation of Cracked RC-Brick Masonry Wall with Opening by BFRP Composite Material
Authors: Lei Zhen , Qu Jun Tong , Wang Yong
Published: October 2014

This in-plane behavior of two one-half scale reinforced concrete (RC)-brick masonry walls with opening before and after retrofitting with basalt fiber reinforced polymer (BFRP) is investigated. One specimen was served as the reference without any strengthening scheme; another one was first tested to the severely damaged level, and then retrofitted with BFRP in a mixed strengthening configuration on two sides. Both of these specimens were tested under in-plane constant vertical load and cyclic lateral load. Test results are analyzed in terms of failure mode, maximum shear strength, ultimate drift, energy dissipation and equivalent viscous damping coefficient, which indicated that the use of BFRP composite material can effectively improve both the strength and deformation capacity of the damaged masonry wall as well as changing failure mode and maintaining the wall’s integrity.
The Measurement Technique of Blind Hole Based on Capacitive Probe Sensor
Authors: Ma Yu Zhen , Sun Xuan , Wang Cheng
Published: October 2014

There are many inconvenience in measuring the diameter of blind and deep holes. The measurement device can hardly stretch into the bottom. The paper is about a capacitive probe measurement system, the whole equipment includes capacitive probe sensor, the measured hole, precision drive part, two-dimensional micro-positioning platform. A simulation analysis was done for the structural parameters, and the eccentricity between the probe and the measured hole, then a reliable measurement results were obtained.
Preparation and Application of Grapheme
Authors: Liu Li , Zhou Chang Chun
Published: October 2014

Graphene is a kind of new carbon material with isomer. Its basic structure is composed of six carbon atoms in closed loop structure. In order to make graphene with excellent properties in practical application, people have proposed various methods of preparing grapheme. Graphene shows promising applications in solar cell. This paper introduced preparation and applications of graphene in the high-tech fields.
Stiffness Detection of Silicon Arm Based on Micro-Loading Method
Authors: Quan Xu Song , Jin Xin , Zhang Zhi Jing , Yu Yang , Ma Liang
Published: October 2014

A micro-loading stiffness detection method for micro-miniature components with brittle and complicated structure has been proposed to achieve stiffness detection of silicon arm. This paper adopts the methord of combing finite element analysis and micro-loading experiment together. Finally, the paper analyzed the deviation of silicon arm’s stiffness values obtained by simulation and experiment, and comparatively analyzed the variation tendency of silicon arm’s stiffness value among different claws. Result shows: the silicon arm’s stiffness value and the stiffness variation tendency obtained by experiment agrees well with it which is obtained by simulation. It proves the stiffness detection method is reliable and rational to achieve the stiffness detection of silicon arm.
Analysis and Experimental Verification on Bias Drift of Silicon Microgyroscope
Authors: Tang Wei Feng , Qiu An Ping , Xia Guo Ming , Su Yan
Published: October 2014

There is a bias drift of silicon microgyroscope when power on which limits its application in higher precision field. This paper analyzes and validates the main cause of bias drift, combined with theoretical analysis of demodulation and experimental results, which has a great significance for improving the performance of silicon microgyroscope. First of all, operating principle of silicon microgyroscope is introduced and theoretical analysis on bias drift is made on the basis of DC output voltage of microgyroscope. Secondly, demodulated signals’ amplitude and phase are analyzed in Matlab with the experimental data. By contrasting theoretical and experimental bias drift, the accuracy of theoretical formula is verified. It turns out that, the relative error of bias drift from 2-hours value to stable value is 5.5%, it’s 6.6% for 1-hour value to stable value and for beginning it’s just 1.7%. Experimental results agrees well with the theoretical analysis, which verifies that the main cause of bias drift of silicon microgyroscope is the phase difference between Vds and Vsense. This conclusion can provide some guidance for structure design optimization and circuits improving.
Effect of Annealing and Gate Insulator Material Changing on the Performances of IGZO-TFT
Authors: Shi Ji Feng , Chen Long Long , Sun Xiang
Published: October 2014

Indium-gallium-zinc oxide Thin Film Transistors (IGZO-TFT) were separately prepared with SiOx and SiNx/ SiOx as gate insulator,with IGZO films deposited at room-temperature by RF magnetron sputtering method as active layer.Compared with TFT with SiOx as gate insulator, The saturation mobility and the on/off ratio of TFT with SiNx/ SiOx as gate insulator were much higher. And,the threshold swing was also smaller.But,the threshold voltage was not good enough,was larger. By annealing at 200°C in the air,the saturation mobility increased from 1.42 to 7.5 cm2.V-1.S-1. While, the saturation mobility had no obvious change when TFT was annealed at high temperature. Seriously, IGZO annealed at high temperature would become crystal,it was not good for the ohmic contact between active layer and metal conductive layer,and,the interface between active layer and insulator would be deteriorated.These will result in the threshold swing become larger and the on/off ratio get smaller.200°C is a suitable temperature for annealing. So,using SiNx/ SiOx films as gate insulator,together with TFT annealing at low temperature, could improve the performances of TFT effectively.
Phase Image Segmentation and Filtering Algorithm Based on Direction of the Gradient Factor
Authors: Zhang Chi , Li Zhong Wei , Shi Yu Sheng
Published: October 2014

To satisfy rigid performance specifications of structure light measurement by phase shift method, the algorithm of phase image segmentation and filter based on direction of the gradient factor was introduced in this paper. In this method, phase image was divided into three parts by condition of extreme value and direction of the gradient factor, including continuous area, edge area and regional noise. Only phase data in continuous area was processed by median filter. This method can reduce the point matching computation of 3-D reconstruction, and at the same time can protect the image edge details, so as to reduce the noise data, provide accurate and effective phase data for reconstruction. Results of segmentation verify feasibility and effectiveness of presented method.
Integrated Approach for Flexible Mixed Model Assembly Lines Balancing and Model Sequencing Problem
Authors: Nie Li , Bai Yue Wei , Wu Jun , Pang Chang Tao
Published: October 2014

The manufacturers nowadays are forced to respond very quickly to changes in the market conditions. To adopt flexible mixed model assembly lines (MMAL) is a preferred way for manufacturers to improve competitiveness. Managing a mixed model assembly line involves two problems: assigning assembly tasks to stations (balancing problem) and determining the sequence of products at each station (sequencing problem). In order to solve both balancing and sequencing problem in MMAL simultaneously, an integrated mathematical model based on mixed integer programming (MIP) is developed to describe the problem. In the model, general type precedence relations and task duplications are considered. Due to the NP-hardness of the balancing and sequencing problem of MMAL, GA is designed to search the optimal solution. The efficiency of the GA is demonstrated by a case study.
Synthesis and Preparation of Desulfurization Concerned Naphthenic Acid Type Ionic Liquid
Authors: Wang Qiang , Li Guo Bi , Cheng Peng , Wang Shi Dong , Zang Shu Liang
Published: October 2014

This paper describes the types and characteristics of ionic liquids, synthesis and application of ionic liquids in chemical and environmental applications, and naphthenic acid corrosion problems and research on ionic liquids are organically combined together, using properties, good stability and easy separating from crude oil, of ionic liquid generated by imidazole and naphthenic acid, exploring the ionic liquid deacidification process conditions and acid removal effect. The naphthenic acid and imidazole react in acetone solvent, synthesis a series of ionic liquids in different reaction ratio, reaction temperature, reaction time and stirring speed conditions,makesome physical measurements and calculation of the yield of these ionic liquids and. The results show that, in naphthenic acid and imidazole molar ratio of 1:1, reaction temperature 70°C, reaction time 7h, stirring speed 400R / min, stand half hour after reaction, the yield of naphthenic acid type ionic liquid is maximum, namely, the deacidification effect is best. At the same time measured in the ionic liquid density is 1.179g / mL, and pH is 5.8. Obtained optimum synthesis condition of naphthenic acid type ionic liquid, greatly improving the deacidification rate of high acid crude oil, more importantly, the method does not cause any pollution to the environment.
Functions of SiO2-Shells in Core-Shell Structured Particles
Authors: Duan Hui Min , Liu Shi Quan
Published: October 2014

Coating a particle with another material to form a core-shell structured composite is often used in powder technology. Silica has widely been selected as the shell material due to its ease of fabrication, versatile surface functionality, physical and chemical stability. In this artilce, the proctective and modifying roles of silica shells in core-shell particles have been briefly reviewed.
The Conventional Triaxial Compressive Test of Plain Reactive Powder Concrete
Authors: Wang Xiao Fei , Wang Yang Ping
Published: October 2014

Through the conventional triaxial test about plain reactive powder concrete under different confining pressures at 0Mpa, 25 Mpa,50 Mpa and 75 Mpa, this paper obtained the stress-strain curves in axial direction and radial direction of plain reactive powder concrete under different confining pressures, compared and analyzed the effects of confining pressures on peak strength, peak strain, Elastic modulus, Poisson ratio and failure modes of plain reactive power concrete also. The results showed that peak strength increases with the increase of confining pressure, when confining pressure increases from 0Mpa to 25Mpa, the peak strength increases most rapidly. The results also showed that peak strain increases linearly with the increase of confining pressure, when confining pressure increase from 0Mpa to 75Mpa gradually, the peak strain increases from 0.2 percent to 0.93 percent, meanwhile Poisson ratio increase with the increase of confining pressures, yet Elastic modulus changes slight at different confining pressures, failure modes of plain reactive powder concrete at different confining pressures exhibit different modes, when confining pressure is 0Mpa, failure mode presents as splitting failure, shear failure mode at 25Mpa, while shear failure merge local crushing at 50MPa and 75MPa.
The Research Reviewed of Subway Construction Impact on Stratum Deformation Law
Authors: Zhu Xun Guo
Published: October 2014

The research achievement of strata movement law caused by subway construction and control standards was summarized and analyzed, and point out that this research on the laws of strata movement (or deformation) caused by subway construction mainly focused on three aspects. The first was research on the ground vertical settlement laws perpendicular to the tunnel excavation direction. The second was research on the ground vertical settlement laws parallel to the tunnel excavation direction. The third was research on the ground horizontal movement regularity perpendicular to the tunnel excavation direction. Through the analysis of the current research results, it is points out the shortages existing in the research, and deeply research in the future. It may provide the theoretical basis, also for practical engineering application provides a certain technical support.
The Influence of Upstream Flow Angle Variation on Intermediate Turbine Duct
Authors: Wang Yang
Published: October 2014

Intermediate turbine duct represent the flow path between the high pressure and low pressure turbine. Caused by the complex flow mechanism, the outlet flow condition of the high pressure turbine is easily changed. Since the upstream flow condition from the high pressure turbine has a significant effect on the internal flow field of intermediate turbine duct, the study in the upstream condition is of high value. Through numerical simulation, the influence of upstream flow angle variation on intermediate turbine duct is observed. It is found that the main influence of the flow angle variation is near the hub side of the duct, and the quantitative result shows that a larger flow angle has a positive effect on the flow field and can reduce loss.
Research on Horizontal Well Hydraulic Fracture Crack Initiation Law of Low Permeability Reservoir
Authors: Wang Su Ling , Zhang Ying , Zhao Guo Feng , Wang Si Qi , Zhang Shan Ren
Published: October 2014

Horizontal well hydraulic fracture construction technology has already become the main development means of low permeability reservoir, and the crack initiation pressure is a key factor in fracture construction. Taking ABAQUS as the platform, combined with rock mechanics, elastic mechanics, fracture mechanics, damage mechanics and fluid-solid coupling theory, to establish horizontal well mechanical model, crack initiation law of horizontal well under different conditions were obtained by using finite element method. According to the horizontal well fracture tested data in Daqing peripheral oil fields, the crack initiation pressure and numerical simulation results are in good agreement, it shows that the numerical simulation method is reasonable, then analyze influence factor of crack initiation pressure on the basis.
Strength Analysis of Epoxy Molding Compound Module Using Automated FEA System
Authors: Lee Joon Seong , Hong Hee Rok , Jo Gye Hyun , Park Dong Keun
Published: October 2014

Recently, consumers are often dissatisfied with the battery life from even the most advanced lithium-ion rechargeable batteries in mobile phone. A mobile battery was chosen in this study because it is the flat plate of small thin wall which is expected to have some flexing. It is required to be evaluated and designed considering the coupled phenomena. Especially, this paper describes finite element analysis simulation of strength evaluation for epoxy molding compound module using automated FE analysis system.
The Impact of Assembly on the Results of Modal Analysis
Authors: Zheng Zhong Cai , Dong Xu , Gao Yan , Jiang Zhen Ting , Xiao Hai Yong
Published: October 2014

The influence of the state of assembly and entity on modal simulation data in the computer simulation is different. In this paper, a typical modal analysis of hydraulic manipulator with the finite element method is conducted to discuss the different. The assembly is assembled by Boolean operations to makes surfaces merging together directly and then converted into the solid model. This way can ensure the validity of the comparable data. The conclusion shows that properly setting the assembly model can make the simulation results closer to the actual working conditions in the computer simulation by comparing the modal simulation data.
Research on the Application of Adjustable Disc Type Nozzle Valve on Wellhead
Authors: Zhang Jing , Ma Zhao Lin , Li Jia Qi , Li Yan Gang , Zhang Ping
Published: October 2014

For the reality of the variable pressure in the oil field, an adjustable disk choke valve is introduced in this paper. The structure and working performance of the valve is described in detail, too. The field application of the valve shows that the valve has such advantages as simple structure, quickly facilitate, easy installation and cleaning, long service life, safe and reliable, all these leads to the broad application prospect of the valve.
Green Ecological Design Research of Tourism Product Packaging
Authors: Zhou Fen Fen , Liao Jian Jun , Teng Jiao
Published: October 2014

With the continuous improvement of people's living standard,the demand of tourists about tourism product is growing.Tourism product packaging has a distinct regional and ethnic characteristics.In the packaging form, It is an important means of promoting the value of tourism products.[1]However,Touris m packaging industry not only to bring economic benefits to society at the same time, also bring the ecological environment and resource potential crisis.In the 1980s,human sustainable development strategy are put forward.The new concept of development is put forward with the changes of The Times, the demand of social economic development.The tourism products of green ecological packaging design began to be widely concerned.The sustainable development of green ecological design is an important subject of tourism industry, packaging industry in China.In the process of the research of the tourism product packaging,We should strictly carry out the general principles of the limit excessive packaging of clear rules.Four kinds of goods packaging,such as drink wine、cakes、tea and cosmetics.The packing layer is less than three layers.Food packing layer is no more than two layers.Beverage, wine, cake packing space is not more than 55% of goods volume,cosmetics do not exceed 50%,tea does not exceed 25%, food does not exceed 25%;Other food packaging gap should be no greater than 45%,packing layer should be not more than three layers.
Comparative Exploration of Mini Vertical Axis Breeze-Driven Generator
Authors: Bai Shu Hua , Yang Hai Dong
Published: October 2014

Nowadays, energy crisis is becoming increasingly serious. Coal, petroleum, natural gas and other fossil energy tend to be exhausted due to the crazy exploration. In recent decades, several long lasting local wars broke out in large scale in Mideast and North Africa because of the fighting for the limited petroleum. The reusable green energy in our life like enormous wind power, solar power, etc is to become the essential energy. This article is to conduct a comparative exploration of mini wind turbine, with the purpose of finding a good way to effectively deal with the energy crisis.
Lightweight of Aluminum Alloy Bumper Based on High-Speed Crash Component Test
Authors: Wu Xian , Chen Ze Yao
Published: October 2014

High-speed crashworthiness characteristics of aluminum alloy bumper were investigated both experimentally and numerically, and then lightweight deign was performed based on these studies. After the simulation results were analyzed, chose plate thickness matching as an optimization direction and got crashworthiness indicators: cross-sectional force, energy absorption, and specific energy absorption (SEA). Design of experiment (DOE) for initial 25 sampling points, which provide input data for approximation, is implemented using the optimal Latin hypercube design (OLHD) method. Polynomial response surface (PRS) models, which are used to approximate LS-DYNA simulation models, are built using the moving least square (MVS), whose all coefficients of determination are over 0.97, indicated high accuracy. The simulation results of optimal designs, which are obtained after 52 iterations of genetic algorithms (GA), show that the mass loss of 30.8%, while energy absorption increase of 4% , SEA increase of 50.3%, and crushing forces decline.