bluuebunny/crossref_metadata_2025 huggingface dataset:
The Study of Electronic Density of States and Optical Properties of ZnO Nanotube by First-Principles
Authors: Fan Yue , Chen Shao Chang
Published: January 2015

In this paper, we studied the electronic density of states (DOS) and optical properties ZnO using first-principles method. We find that the electronic density of states was different in bulk ZnO and ZnO nanotube. The DOS of bulk ZnO spread at wide energy while the DOS of ZnO nanotube concentrated in a narrow energy range. The peak around-18 eV moved to a higher energy. The peaks more than Fermi level concentrated to the Fermi level, which meant the conductivity of ZnO nanotube was better than that of bulk ZnO. We also calculated the optical properties of ZnO nanotube. The optical properties showed that there were peaks around 8 eV, which may come from electrons transition between Zn 3dand O 2pstates. Our calculation provided a reference for the application of ZnO nanotube in optical devices.
Analysis of the Ventilation Effects on Radon-222 Exhalation in a Dead-End Tunnel
Authors: Wang Shu Guang , Yang Wei , Chen Qing , Chen Jian Hua , Han Cong
Published: January 2015

The regularity of radon exhalation rate in the over-broken granite tunnel is susceptible to weather conditions and ventilation styles. Based on the calculation model of radon exhalation in tunnel, some experiments have been carried out to analyze the variations of radon exhalation in cases of natural ventilation, blowing ventilation and exhaust ventilation separately. The results show that there is a linear relation between the radon exhalation and the natural ventilation quantity, and also between the radon exhalation and the ambient temperature; the radon exhalation in the case of exhaust ventilation is 63% higher than that in the blowing case under the condition of the same ventilation quantity and ambient temperature. Therefore, it is suggested that operation in the tunnel in high temperature be avoided in summer, and the blowing ventilation be adopted as an effective way for ventilation.
Research of Integrated Valve Plate Differential Pressure Leak Measuring Device
Authors: Zhang Mei Qin , Miao Kai Cheng , Xu Gang
Published: January 2015

Valve plate differential pressure leak measuring device uses channels in the plate instead of the pneumatic pipe lines in traditional leak measuring devices. The integrated device in this paper will integrate the whole leak measuring pneumatic system on a fixed valve plate through combining self-made valve plate and pneumatic valve, which will significantly reduce the cost, simplify the design of the differential pressure leak measuring pneumatic piping, make the operation more simple and improve the reliability and accuracy of leak measuring device. The pneumatic charging valve and the pneumatic release valve can work in both high and low pressure conditions, so the range of application is very wide and all these features will significantly improve the competitiveness of the differential pressure leak measuring device company.
An Optical-Triangulation-Based Method for Measurement of Blade Sections
Authors: Zhu Yong , Liu Jing Liang , Li Cheng Wei , Kang Zheng Ya
Published: January 2015

Blades are an important part of aviation engine, its manufacturing compliance seriously affect the performance of the engine. Blades tend to be free-form surface modeling, which makes it extremely difficult to measurement. Since no probe radius compensation, high efficiency, non-contact optical measurement methods get more and more attention, but the inspection uncertainty of optical measurement is usually between 30um to 50um .To reduces the optical non-contact measurement uncertainty, this paper presents an Optical-triangulation-based method for measurement of blade sections. There is a data optimization process in the method, and this feature makes the proposed method can obtain better measurement results. At last, some experiments demonstrate the effectiveness of this method.
Study on Fast Calibration Model for Beam’s Space Position of Point-Structured Optical Probe
Authors: Liu Jing Liang , Zhu Yong , Kang Zhen Ya , Wang Lei
Published: January 2015

In this paper, calibration algorithm of point-structured laser’s beam space position can work in coordinate measuring machine (CMM) system by using the object-oriented design method with VS2010.And then, building complex mathematical model to achieve the auto-calibration process,so it can improve the efficiency and the repeatability of the probe calibration. The calibration experiments proved that the auto-calibration model was right.
The Effect of Orifice Plate on Flow Field and Thermal Environment in Oven Box
Authors: Li Hao , Zou Zhi Jun , Wang Fei
Published: January 2015

Air velocity in oven box is an important factor. The value of air velocity will affect the result of drying. This paper use the method of numerical simulation to research the effect of orifice plate on flow field and thermal environment in oven box. The results show the change rate of thermal environment & air flow field in oven box is depend on supply air volume, and the use of orifice plate will affect the flow field obviously.
In-Depth Research Information Differential Method of Measurement
Authors: Wang Shun Jiang , Dong Fang , Luo Wei Hua
Published: January 2015

With the development of automation and communication technology, measurement information is widely used in various industrial, agricultural, commercial, and other living. At present, the problems exist in the accuracy and time synchronization of the measurement information. That brings the difficulty for data analysis and decision making. This paper starts from the existing measurement information, in-depth analyses the root cause, puts forward the measurement information of differential method, the effect of practical application in electric power system by measuring the differential method of information So as to determine the role of differential measurement method of information and promotion value, provide strong support for the rapid development of automation information technology.
Monitoring of Campylobacter jejuni Contamination in Different Links of Broiler Production Chain in Qingdao
Authors: Zhai Hai Hua , Chang Wei Shan , Wang Jun Wei , Wang Juan
Published: January 2015

Microbial monitoring of broiler production can provide an important theoretical basis for the prevention and control of animal diseases and reduce the pollution of the environment. In order to investigate the contamination and spread of Campylobacter jejuni in broiler production chain, we collected samples from the broiler farms, slaughterhouse and market of a big production chain in Qingdao, isolated and identified of Campylobacter jejuni. Then we used genotyping method to subtype the isolates. The result showed that C.jejuni were widespread in broiler pruduction chain, and the strains can spread during the production chain, so strengthen the scientific management of the production chain must be implemented. Control in the feeding, processing and preparation before eating of chicken are the important measures in reducing the Campylobacter jejuni infections caused by chicken.
Early Cancer Locating Method Based on Infrared Functional Imaging
Authors: Shao Li Jun , Zhang Zhi Mei , Yang Jin Yan , Leng Hong Mei , Chen Wen Jun , Wei Zhen
Published: January 2015

Owing to complexities of human body structure and thermal mechanism, the invivo distribution of abnormal heat source cannot be estimated quantificationally based on human body’s infrared functional imaging.Fourier regularization mathematical processing method was used to identify the relationship between the lesions’ heat radiation energy and visible data through the establishment of physical model for human thermal radiation.Through characteristic information of infrared functional imaging,the distribution and location of human body’s early cancer lesions should be found out exactly. And some exploratory experiments based on simulation materials were conducted to demonstrate the feasibility of this method.
Finite Element Analysis of Circular Piezoelectric Resonator with Box Fixation
Authors: Liu Xi Wen , Liu Chao Ying
Published: January 2015

The ANSYS finite element analysis model for circular piezoelectric resonator is built in this paper, and experiments are carried out for verifying the validity of the finite element model. The influence of the piezoelectric resonator's fixation ways on the natural frequencies and vibration displacement is discussed, lower natural frequencies and higher efficiency of converting electric energy to kinetic energy will be gotten in the box fixation way. The researches on this paper provide a theoretical basis and effective ways for piezoelectric resonator design and optimization.
Automobile Electrostatic Precipitator
Authors: Mo Hai Ping , Gao Li Na , Xu Biao
Published: January 2015

Road dust is an important part of the atmospheric particulate pollutants, which has become one of the important factors influencing the quality of our environment of the city. Espescially in the northern city. The air particles contributes more than 50% in the road dust. Particle diameter of the particles below 10um is the greatest harm to the health of human beings. At present, the city of this control mostly adopt sprinkler, manual cleaning and other traditional way. The dust removal effect is not significant and cost a considerable human, material and financial resources. So this paper quotes the electrostatic dust removal principle of thermal power plant to design a new type of device used in road dust cleaning. Its energy consumption is small, high absorption efficiency. The influence of automobile driving resistance is small. To be located in the rear of the car, it will complete the whole removal process in automatic car running. Do not need to complete the staff involved, greatly saves manpower cost. It also can suck tiny particles in addition to PM10, PM2.5 and so on, can greatly improve the city's air quality.
Method of Effectiveness Analysis and Use of CT Image
Authors: Lian Su Jie , Zhou Jin Hui
Published: January 2015

In this paper, through the introduction of working principle of the existing CT and the composition, the causes of image artifacts are analyzed in detail. On the basis of the examples, the paper expounds the methods to avoid image artifacts, providing a theoretical guidance for the future technology weapons testing.
Research on Knowledge Change Rate-Based Attribute Importance Measure Method
Authors: Li Fa Chao , Hu Qi Hui
Published: January 2015

For the problem of attribute importance measure, basing on the decision information system, and according to the characteristics and shortcomings of the existing measure modes, we discussed the associated features between the lower and upper approximation of decision classes and the knowledge in system. Then, we constructed an attribute importance measure mode based on the knowledge change rate, and analyzed the features of the constructing measure mode from different angles. Theoretical analysis and example calculation show that the established mode is a supplement and perfect for the existing measure modes, and it not only can effectively use the existed information to reveal the associated features among each attribute, but also have a good structural characteristic and strong interpretability. It has a broad application prospect among information fusion, fuzzy decision, comprehensive evaluation and so on.
The Multi-Station Clamp Device of the Long Truss Girder End Parts Processing
Authors: Sun De Ying , Shang En Guang
Published: January 2015

The Long girder end parts are one of the types structure in aerospace equipment, the complex structure parts, machining parts. Usually the parts be processed on the NC milling machine, through the analysis of processing craft, design a kind of quick change type, Multi-station clamp device, instead of processing the parts on the multi-axis nc machine tool; at the same time of guarantee machining accuracy, in order to improve the production efficiency and reduce the cost of production.
Design and Simulation of the Hydraulic Synchronous Control System of the Upper Roller in Bending Machine
Authors: Cao Yang , Qiu Kai Wen , Wu Guo Qing , Yu Rong Chuan , Zhong Chao Chao
Published: January 2015

This paper sketches the overall structure of the hydraulic system of bending machine, and designs the hydraulic synchronous control system of the upper roller in bending machine. Then making use of AMEsim software to establish hydraulic system simulation model to analyze the pressure, velocity, displacement and other parameters of hydraulic cylinders in two cases when in open loop and closed loop system. After that, use PID algorithm to simulate the upper roller of bending machine in hydraulic closed loop synchronous system, which verifies that it can meet the motion requirements and get a higher synchronous precision.
Research of Control System of the Large-Scale Blow Molding Machine
Authors: Qiu Lin
Published: January 2015

Through the analysis of molding process of large-scale plastic hollow containers, this paper carries on the simulation and optimization of hydraulic system, which focuses on the high energy consumption problem of large-scale blow molding machine. According to the characteristics of long work period and great fluctuation of flow demand, the paper designs the oil supplying system that can match the actuators’ hydraulic energy demand, introduces the working process of each component in the system, and analyzes the key technology of hydraulic system as well. The design and research avoids the shortcomings such as more components, complex debugging, discontinuous control and unstable operation, substantially reduces the installed capacity of variable pump and driving motor, and in the meantime, solves the impact problem of actuators effectively, which can make hydraulic system high efficiency, energy saving and run steadily.
The Design and Simulation of AC Asynchronous Motor Direct Torque Control System
Authors: Zhang Li Ping , Xin Xu Guang , Wang Wei Ya , Wu Hai Feng
Published: January 2015

The direct torque control (DTC) system of the traditional asynchronous motor has many disadvantages, such as complex modeling and large amount of calculation, In order to improve the dynamic performance of the DTC system of the asynchronous motor, a direct torque control system is put forward. It uses space vector analysis method to calculate electromagnetic torque and stator flux linkage of asynchronous motor directly, follows the change of the stator flux linkage and torque, omits the complicated calculation, reduces the dependence on motor parameters. The simulation model of the DTC system of the asynchronous motor was established using SIMULINK software package. The feasibility of method is proved in theory, The results of simulation show that the modeling and simulation of the system has good static and dynamic performance, control precision of the system is higher, the stability is better.
Research on Architecture for Multi-UAV Systems Based on Autonomous Cooperation
Authors: Peng Peng Fei , Gong Li , Yu Qian
Published: January 2015

The problems confronting multi-UAV systems when carrying out tasks are described from the perspective of architecture. According to the traits of multi-UAV systems and the needs when performing combat tasks, the functional requirements are analyzed. And a scheme of the system architecture for multi-UAV systems based on autonomous cooperation is put forward according to the thoughts of autonomous cooperative control. Meanwhile, the architecture reconstruction method of f multi-UAV system architecture under conditions of uncertainty is further studied. The design process showed that: the proposed architecture can meet the functional requirements and has good application prospects in future engineering practice.
Workspace Analyzing for Hybrid Serial-Parallel Mechanism of a New Bionic Quadruped Robot
Authors: Song Meng Jun , Ding Cheng Jun , Yu Chang Juan
Published: January 2015

In this paper, a new bionic quadruped robot was proposed by us. The mechanism of robot we analyzed is as a hybrid series-parallel mechanism, so a new methods for constructing the kinematic model of the bionic quadruped robot very quickly and efficiently was introduced. we analyzed the workspace of the legged mechanism by using geometric composition method and numerical analysis method in the following section. Furthermore, the kinematic model of the parallel mechanism of the multi-motion mode bionic quadruped robot was constructed when the robot was in the stance phase, we also construct and solve the inverse kinematic model of the parallel mechanism of the robot, and the simulation results provide a better method for the robot’s workspace analyzing;Finally, the simulation experiment showed that the method we presented above could provide a good support for the multi-motion mode bionic quadruped robot walking smoothly and automatically.
Study on Electrical Control System of X62W Milling Machine Based on PLC
Authors: Yang Guang Yue , Deng San Peng , Qi Yu Ming
Published: January 2015

With the continuous development of milling machine, the normal milling machine was not suitable with modern processing. In order to adapt to the requirements of modern production process and quality, the electrical control system of milling machine need be improved. The electrical control system and circuit of X62W milling machine is analyzed and designed. The PLC program is compiled. All of it is proved to be reasonably and feasibly based on the experimental results.
The Path Planning Control of a Mobile Robot Based on Fuzzy and Fuzzy Adaptive PID
Authors: Zhang Su Ying , Shen Yan Kai , Cui Wen Shuai
Published: January 2015

The purpose of this paper is to suggest and examine a control system with a fuzzy controller and a fuzzy-PID controller to solve the problem of mobile robot path planning. The environment information about obstacles and the goal has been detected by using sensors. The system divides environment situations into two types the obstacle mode and non-obstacle mode. In view of the oscillation problem existing in fuzzy control when there is no obstacle, this paper proposes that the fuzzy control is used for the obstacle mode and the fuzzy adaptive PID control is used for the non-obstacle mode. The robot performs the real-time planning choice by path planning selector, and the control system is simulated by Matlab software. The simulation result shows that the control strategy has the characteristics of faster response, better real-time performance and achieves a better path from the start point to the target point.
Design and Fabrication of a Mobile Self-Reconfigurable Microrobot with Wall-Climbing Ability
Authors: Zhang Da Wei , Zhao Xin Can , Deng Ji Cai , Li Zhen Bo , Chen Jia Pin
Published: January 2015

The paper presents an original mobile self-reconfigurable microrobot with wall-climbing ability, which is fabricated by combination of non-silicon surface microfabrication techniques and precision machining techniques. The omni-directional mobile mechanism with magnetic wheels and the novel universal microconnector with automatic connecting/disconnecting mechanism are designed, which are both actuated by MEMS-based electromagnetic micromotors. The mechanical prototype of the microrobot is developed, and its fabrication method is introduced.
Diesel Engine Running at Constant Speed Base on Fuzzy Control Strategy
Authors: Wu Fei
Published: January 2015

The functional relationship among the cylic oil quality of diesel engine, rack displacement and the engine speed was obtained by Orthogonal Test, significance of the regression equation was test by variance analysis. Based on the model, using the fuzzy control method, the voltage to stepping motor was controlled by the method according to the engine speed and its variation rate, which can controll the diesel engine speed percisely. From the simulation result, it shows that the diesel engine run at the range of the set speed effectively by the fuzzy control strategy, and controlling effect is significant.
Design of a Temperature Control System Based on Generalized Predictive Control
Authors: Peng Yun Feng , Shu Chang , Tan Xiang Lin , Shao Zhi Chao
Published: January 2015

According to the unsatisfied control result in a military inertial navigation platform,a control method combined with generalized predictive control and PID control is proposed,accurate control can be realized in terms of time and temperature. MATLAB simulation is given to illustrate that this method satisfies expected requirements well,and is feasible and available.
Three Dimensional Model Construction and Strength Finite Element Analysis of Cold Shearing Machine Crankshaft
Authors: Li Ai Hua , Liu Hong Yu
Published: January 2015

Cold shearing machine is the machine equipment often used in metallurgical industry to shear head, tail and fixed length of rolled piece. The shearing movement of cold shearing machine can be realized by crankshaft driving link rod with relative up-and-down motion. Load on crankshaft is comparatively big. In this paper, cold shearing machine crankshaft was taken as an example. The three dimensional model of relative cold shearing machine crankshaft was constructed by SolidWorks software. Strength finite element analyses on relative model were made by static analysis module attached to SolidWorks software under maximum load working conditions. The overall displacement distribution pictures and overall Von Mises stress distribution pictures of cold shearing machine crankshaft under relative load working conditions were obtained. This research provides important reference base for the design and reform of cold shearing machine crankshaft.
Comparison of Resource Scheduling Algorithms for LTE-Based Smart Grid Communications
Authors: Xu Chang Fu , Tao Feng Bo , He Yong
Published: January 2015

The long term evolution (LTE) is a promising candidate solution for smart grid communication network due to its high data rate, lower latency, high mobility, and large coverage. In this paper, we discuss three resource scheduling algorithms for the LTE-based smart grids, including proportional fairness, round robin, and maximum rate scheduling schemes. In the simulations, we compare these three resource scheduling algorithms, the results show that the proportional fairness scheduler can achieve the best tradeoff between the average sum rate and the fairness among all the users.
The Identification Algorithm of Power System’s Bad Data Based on Improved K-Means
Authors: Wang Bao Yi , Zhu Liang , Zhang Shao Min
Published: January 2015

The operation of power system generates a huge number of data. Manual screening of bad data is almost impossible to achieve. Bad data detection of the power system is the essential prerequisite for power system state estimation. So combined with the characteristics of bad data of the power system, this paper puts forwards an improved K-Means algorithm based on PSO. The traditional K-Means algorithm has disadvantage that it has low efficiency to determine the cluster’s center, but PSO algorithm has the ability to determine the cluster’s center quickly and accurately, this paper combines them together and take advantages of each of the two. The improved K-Means algorithm is based on PSO and verified the effectiveness of the algorithm. The results satisfy the requirements of screening bad data and reduce the false alarms and the probability of undetected and improve the recognition efficiency.
The Design of Signal Generator Based on FPGA High Resolution
Authors: He Chun Yan , Liu Bing Qi , Liu Ming Zhe , Mao Xiao Bo
Published: January 2015

In view of the digital geophone self-test system application demand for a variety of high quality waveform signal. This paper introduces a kind of design method of direct digital synthesis waveform signal generator based on FPGA. It mainly discusses the principle of the method of frequency synthesis technology, design thinking and implementation method. And using the design method of pipeline structure to improve circuit structure of 48 bits phase accumulator, so as to improve the running speed, and further increase the resolution of frequency synthesis. The test shows that the signal generator can produce sine wave, square wave, sawtooth wave, triangle wave. The frequency resolution can reach 0.18μHz. The highest output frequency is up to 20MHz, and frequency switch time is 20ns.
The Embedded Video System Based on N32926 with RT-Thread
Authors: Shi Zhi Yuan , Ding Bing Bing , Lin Jin Feng , Feng Chao
Published: January 2015

It is used by the research platform based on the N32926 development board of Nuvoton Company, achieved the real-time capture and display of video. It is chosen RT-Thread as its operating system on the development board. It can be captured images video system by used OV7725 camera and then encoded these images with H.264, finally it can be decoded the images and convert the YUV data into RGB format and displayed.
Real-Time Precise IOT Positioning System Based on Chirp Spread Spectrum Technology for Transportation
Authors: Wang Wei , Hou Sen , Lu Mei Ling , Liu Song
Published: January 2015

Real-time precise IOT positioning system based on CSS uses the way of bus or Ethernet with wireless CSS network. With its unique CSS technology to measure the distance, the console can achieve real-time communication and position monitoring of personnel and goods. The system has better comprehensive performance than active RFID, Zigbee and WiFi positioning systems and other technology on the market currently. The functional independence of its communication system makes it easy for the practical application and extensions, and the system has wide application value.
An Improved Filter Method of Medical Image
Authors: Xu Yan Lei , Wang Cong , Bao Jia Lin
Published: January 2015

The paper analysis mean filter, median filter and morphology filter. The paper studied order morphology theory and its filter character. Based on this, the paper proposed multi-scale and multi-structure filter algorithm based on order morphology. The result of simulation shows that the algorithm can not only keep the edge and detail of medical image but also can enhance the contrast of recovery image.
A Multiband Noise Reduction Wiener Filter Algorithm for Hearing Aid
Authors: Xue Feng Jie , Guo Zhao Yang , Wang Xin An
Published: January 2015

Speech processing in hearing aid often operates in noisy environments. So noise reduction algorithm is very important for hearing aid. This paper reviews conventional wiener filter algorithm and points out its remained problems----musical residual noise and low speech intelligibility for low input signal-to-noise ratios (SNR). To solve the problems, the proposed algorithm divides the frequency (0-8000 Hz) into 16 bands in Mel-frequency scale and processes the signal separately to remove musical residual noise. Meanwhile, a new Voice Activity Detector (VAD) applied for digital hearing aid is also presented. Based on the accurate judgment of speech frame, the filter processes the speech frame and non-speech frame in different ways. The method is realized in matlab to test output SNR and PESQ (Perceptual Evaluation of Speech Quality). It is also realized in android app for real-time test. Both of the experimental results demonstrate the advances of the proposed algorithm.
A Novel Camera Calibration Method Based on Simulated Annealing Genetic Algorithm
Authors: Ran Shuang , Ye Long , Wang Jing Ling , Zhang Qin
Published: January 2015

The optimization of the camera’s intrinsic and extrinsic parameters is a key step after obtaining the initialized parameters’ state by considering the homography between the board space plane and the image plane in Zhengyou Zhang method. In this paper, we proposed a camera calibration optimization algorithm by adopting genetic algorithm and the simulated annealing algorithm. The experiment results demonstrate that our algorithm can improve the precision of the camera calibration to a certain extent.
Camera Calibration Based Multi-Objects Location in Binocular Stereo Vision
Authors: Zhu Ying , Ye Long , Wang Jing Ling , Zhang Qin
Published: January 2015

In order to capture high quality binocular stereo video, it is necessary to manipulate both the convergence and the interaxial to take control of the depth of objects within the 3D space. Therefore the scene understanding becomes important as it can increase the efficiency of parameters control. In this paper, a camera calibration based multi-objects location method is introduced with the motivation that supply prior information of adjusting the convergence and the interaxial during capturing. Firstly, we are intended to calibrate the two cameras to get the intrinsic and extrinsic parameters. And then, we select points of the object in the images taken by left and right cameras respectively to determine its locations in the two images. With three-dimensional coordinate of objects, the distance between the object and camera baseline is calculated by mathematical methods.
Hunan Undertook an Obstacle to the Transfer of the Pearl River Delta Industry in Analysis Internet Era
Authors: Zhou Yu Fei , Deng Yi Cheng
Published: January 2015

Some enterprises of the Pearl River Delta had invested in Hunan province, and they played significant roles in Hunan’s economic development. However, the contribution to economic growth in general was not obvious in Hunan. According to the quantitative analysis that Hunan undertook an obstacle to the shift of the Pearl River Delta Industry. It could be found: The actual utilization of foreign investment in Hunan, Hunan road length, the balance of rural and urban residents in Hunan, Hunan consumption level and years of commodity market turnover, these five variables are the key barriers that Hunan could not take over the transfer successfully in Internet era. Five variables representing the Government's institutional arrangements for attracting foreign investment, transport infrastructure, subject to cultural constraints on investment entrepreneurial spirit, the regional market factors in Hunan that be decided from the regional market size and level of development. Therefore, to speed up the transfer of industries in Hunan docking the Pearl River Delta, it must be focused on several aspects of the above and then do the reform and innovation.
An Oedometer-Based Method for Preparing Reconstituted Clay Samples
Authors: Yin Jie , Miao Yong Hong
Published: January 2015

It is well known that the mechanical behavior of the natural intact soft clay is usually quite different from that of the reconstituted counterpart. Hence, how to predict the influences of soil structure on the mechanical behavior of natural clays is an important issue in geotechnical engineering.The mechanical behavior of structured soils can usually be quantitatively assessed based on the mechanical behavior obtained from corresponding reconstituted clays. The preparing method for reconstituted soils will affect the quality of reconstituted samples greatly, and therefore, affect their mechanical parameter. To guarantee the quality of reconstituted soil samples, a large diameter oedometer apparatus is developed. Also, an oedomer-based method for preparing reconstituted clay samples is proposed. Typical soft Lianyungang city clay from China is chosen to testify the methods and corresponding procedures. The feasibility of the improved method is confirmed by comparing its results with those of the normal oedometer test.
Investigation on Atmospheric Pressure Plasma Jet of DBD and its Application on Bacteria Inactivation
Authors: Liang Tao , Hou Shi Ying
Published: January 2015

Two kinds of multiple-pulse were reported on atmospheric plasma jet (APPJ) of dielectric barrier discharge (DBD) configurations in this study. Meanwhile, the investigation on electrical characteristics of APPJ in helium and helium/air was carried out with the aim of shedding light on the electrode parameters for dissipated power and jet length. The typical bacteria, E. coil, were employed to study the effect by the two APPJ devices (PJ-1 and PJ-2). For PJ-1, multiple-pulse appears in both sides of every half-cycle, but only in the positive half-cycle for PJ-2. A wider power electrode of PJ-1 and further distance from the nozzle to grounding electrode of PJ-2, whether in ambient helium or helium/air, are all conducive to improvement of dissipated power. With the increase of gas flow rate, the jet length will become longer at laminar flow mode, then get shorter, and a permanent to the end. Generally, the introduction of air leads a better sterilization effect, especially for PJ-1. Keywords: Atmospheric Pressure, multiple-pulse, Electrode parameters, dissipated power, jet length, plasma jet. PACS: 52.80.-s, 52.77.-j
Analysis of Motor Vibration Frequency by the Change of the Base Anchor Inclined Plate Length
Authors: Gu Yu , Li Qiang , Li Shao Xiong
Published: January 2015

It will vibrate when the natural frequency close to the external exciting force during the operation of the motor, accurate and effective calculation of the natural frequency of the motor has an important significance to damping noise. The inherent frequencies of the motor were got by numerical simulation model and the ANSYS finite element modal analysis, and comparison results verify the effectiveness of the motor model. The effect of the foot length change to the inherent frequency was researched emphasis, and puts forward related suggestions.
Application of Intelligence Control in Agriculture Greenhouses
Authors: Lu Hui Guo , Li Cong Ying , Jiang Juan Ping
Published: January 2015

Agriculture is the foundation of the national economy, and the guarantee of national industry. Greenhouse can grow counter-season production of crops and bring higher profits to farmers. But in our country the informatization level of agricultural is low. By using data acquisition technology, wireless communication technique and computer technology, this project can make intelligent monitoring, management and control of the large-scale plastic greenhouse come true and make agricultural information access and remote data transmission and exchange automated. The project is of simple circuit, low cost, good maintainability, and the expected results (the management of the greenhouse control) is operating conveniently and hommization, which can reduce a lot of manual work. It is expected to be widely popularized in agricultural plastic greenhouses in China. Key words:Intelligent Agriculture; Automation; Data acquisition; Sensors;
The Application of Fuzzy Control in Vehicle Emission Reduction Technology
Authors: Zhang Wei Jiang
Published: January 2015

In this paper, fuzzy control was applied in the technology of reducing NOx of vehicle exhaust. The calculation model of control system was obtained through theoretical derivation. The input and the output of the control system were obtained through bench test, and then established the control system table. Fulfilled the hardware installation and debugging of SCR system, DSPACE system, NOx sensor and engine system, and then the control system look-up table was be written in DSPACE /MATLAB system. It is proved that the application of fuzzy control in vehicle emission reduction is feasible through the processing and analysis of test data.
Robust Output Regulation Approach for Attitude Control and Momentum Management of the Space Station
Authors: Liu Yong , Huo Wei
Published: January 2015

An novel methodology to solve the attitude control and momentum management problem of the space station with model uncertainties is developed. By the use of the robust output regulation theory, the attitude control and momentum management integrating model and the internal model of disturbances are combined to design a robust coupling controller such that the plant outputs track desired reference signals and the model uncertainties can be tolerated. It is proved that the designed controller guarantees stability of the closed-loop system and suppresses the disturbance well. Simulation results are provided to demonstrate the feasibility of the proposed method.
An Intelligent Reference Governor for Primary Air Control System in a Circulating Fluidized Bed
Authors: Zhuo Xu Sheng , Li Tong , Yang Fan , Wang Dan Dan
Published: January 2015

In combustion of a circulating fluidized bed, primary air plays a key role in keeping materials fluidized and regulating bed temperature. This report provides a design of reference governor for primary air fans to amend their control commands. That will improve the combustion efficiency via regulating primary air flow rate timely according to the changes of coal feed flow rate and bed temperature. To deal with the large inertia and slow response feature of primary air fans, a rule-based control method was used to design the reference governor. Based on the experiences of technical experts and operation data analysis, an expert rules system with wide coverage range was developed, which composed of the logical relationships between the coal feed flow rate, bed temperature and the primary air flow rate in various operation conditions. Test results show that designed reference governor can improve the control performance of primary air flow rate obviously.
Developed Numerical Investigation into Residual Stress by Vickers Instrumented Indentation Technique
Authors: Chen Yao , Liu Wei Wei , Qi Fei
Published: January 2015

This research presents a developed simple analytical model to estimate the residual stress state and its magnitude in plasma sprayed coating based on the Vickers instrumented indentation results. By means of energy method during a Vickers indentation cycle, it is convenient to compute the stress state and its magnitude without any comparison of load-displacement curves of stress-free reference material. Computed results show that the residual stress in plasma sprayed Al-Si coating mainly ranges between 23-32 MPa in tensile state, which is consistent with the measurement of residual stress in as-sprayed NiCrAlY coating using neutron diffraction.
A Study on Minimum Variance Benchmark under Actuator Constrains and Stochastic Disturbances
Authors: Zhang Qing Yue , Xu Yan Ru
Published: January 2015

As a benchmark to assess the performance of the control loops, MV (minimum variance) has been widely used in industrial process.MV control gives the lowest achievable output variance when there is no constraint on the actuator. In this paper, it shows that MV controller is no longer optimal and the mean of the output value is non-zero when the constraint is active and the parameter of the disturbance is approaching to one. In order to achieve the lowest variance of the output value, and the mean of the output value can be approaching to zero, a new approach is proposed in this paper. The proposed method is imposing a compensation value on the constrained MV control law, meanwhile, a new performance index function is introduced. As a result, it is believed that this method is more effective to the real industrial process for systems with actuator constraints and stochastic disturbances. Simulation example demonstrates the usefulness of this method.
Literature Review of the Communication Technology and Signal Processing Methodology Based on the Smart Grid
Authors: Ma Zheng Xiang , Zhang Min , Shaham Sina , Dang Shu Ping , Hart Jessica
Published: January 2015

The Smart Grid, acting as a powerful technique for addressing the existing challenges in the power network, has matured in recent years. Its importance has been well recognised. As the most important property of the Smart Grid, the information interactivity over the power network is a frequent topic for academia and industry. Therefore this paper introduces the main achievements of recent years associated with the communication technology and signal processing methodology based on the Smart Grid. Their pros and cons will also be summarised and analysed in detail. To be brief, the novel properties and developments of the Smart Grid, the communication techniques, and the involvement of cRIO integrating FPGA, TDMS, SQL Server, DataSocket Server and LabVIEW Electrical Power Suite will be elaborated upon.
Electromagnetic Compatibility Analysis Method for FBAR Devices
Authors: Gao Yang , Zhou Bin , He Yi , He Wan Jing
Published: January 2015

With the increasing of resonant frequency and integration of film bulk acoustic resonator (FBAR), the electromagnetic interference (EMI) of FBAR devices appears to be extremely important. The electric fields of the common electrical model and finite element model are assumed to be quasi-static and cannot simulate the electromagnetic (EM) property. A 3-D EM model of FBAR is achieved by means of high frequency EM simulation software HFSS. A real-time simulation of EM distributed effects, EM coupling and piezoelectric effects is achieved by employing an effective permittivity in the EM model. The effects of the high frequency EM distributed effects and the EM coupling on resonant characteristics are analyzed. By optimizing the distance between FBAR and components, introducing substrate materials with different permittivity, the EM coupling is effectively reduced.
The Transplantion and Realization of Qt4.7.0 Based on ARM9 and Linux
Authors: Zang Chuan Qiang , Gao Ming Yu , He Zhi Wei
Published: January 2015

With continuous improvement and update of embedded Linux kernel, embedded technology has been widely used in handheld devices and industrial control field. Therefore, a user-friendly graphical user interface (GUI) is essential for these applications. This paper firstly presents the design method for transplanting Qt on embedded platform of ARM9. Secondly it elaborates the device driver development and Qt interface development in Linux system with a Qt test program. All transplantation method of Qt and test program have been tested and verified on the ARM9 platform.
The Numerical Simulation of Reinforced Particle Stress Concentration in Al-Si Alloy Rolling
Authors: Zhao Yan Ling , Yang Xue Song , Yun Zi Yan , Wang Hong Bo , Xu Guan Hong
Published: January 2015

Aiming at the problem that temperature filed changes can lead to edge cracks emerge to Al-Si alloy 4004 in the process of hot rolling, in this paper, finite element model of temperature field variations in the process of rolling have been established by the method of finite element numerical simulation. The relationship between temperature field variations and edge crack defects has been analyzed. The results show that temperature field of rolled piece is gradient variations, low in the center and high in the edge, metal accumulation in the edge, leading to stress concentration and forming cracks source, resulting in edge cracks arising in edge of roller piece. Finally, the reliability and accuracy of the numerical simulation method have been verified by hot-rolled tests and tensile tests. All the studies provide ideas for theoretical analysis of temperature variation during hot rolling and have important significance on improve the quality of products.
Detection Method for Single-Phase Random Harmonic Current without PLL
Authors: Wu Li Ran , Wu Ming Li
Published: January 2015

The harmonic current detection is an essential part for an active power filter (APF). A random harmonic current detection method for single-phase active power filter without the phase locked loop (PLL) is proposed. The detection errors caused by low pass filters are analyzed, and an improved method has been proposed which can increase the detection accuracy and response speed. This method can detect the single order harmonic current and decompose it. Theoretical analysis and simulation results show the validity of the proposed method.
Design of a Wedge-Angle Log-Periodic Antenna
Authors: Yu Zhen , Ran Xiao Ying , Yu Jian Guo
Published: January 2015

A wideband wedge-angle microstrip patch log-periodic antenna with 16 units operates at the center frequency 2.45GHz, is presented in this paper. Design an antenna interactive calculator with Visual Basic software to calculate and to adjust antenna parameters conveniently. Then, construct, simulate, and optimize the antenna model by use of Ansoft HFSS software. The patch log-periodic dipole antenna (LPDA) is tested by PNA3621 vector network analyzer. Measurement results show that the antenna has good characteristics with symmetrical radiation pattern, broad bandwidth, little number of side lobes, and voltage standing wave ratio with echo loss are relatively ideal in 2GHz~3.2GHz frequency range, which agree well with the simulation results.
Analysis on Disequilibrium of Wireless Network Data Traffic
Authors: Guan Jian , Cheng Xin Zhou
Published: January 2015

This paper analyzes the disequilibrium of wireless network data traffic, gives analysis and research methods for regional disequilibrium and time disequilibrium characteristics, and proposes a data traffic prediction method for regional users in consideration of redundant traffic.
Minimum Cost Programming Models of Nodes Deployment for WSNs
Authors: Fan Tie Gang , Teng Gui Fa , Huo Li Min
Published: January 2015

WSNs can cover a wide range of application. Node deployment is a fundamental factor in determining the connectivity, coverage, lifetime and cost of WSNs. This paper focuses on the cost of network that satisfies some constraints (coverage, connectivity and lifetime). In order to satisfy the connectivity and coverage, we use the regular hexagonal cell architecture. We present a new metric, the Cost Per Unit Area and Lifetime, to be objective function. Three programming models are proposed under different scenarios. For reasons of space, we present briefly the method to solve above models and some analysis.
High-Speed Parallel Implementation of AES Key Expansion Algorithm Based on FPGA
Authors: Xiao Shun Wen , Dai Xian Zhi , Qi Huai Bing , Liu Han Kui , Zhang Qian Shu , Wang Yun Xiu
Published: January 2015

According to the traditional AES algorithm, we present an optimized scheme, which offers an implementation of AES key expansion algorithm. The key expansion algorithm is shown by matrix in this scheme, then it is converted to look-up table, we use FPGA which has rich look-up table and storage resources to implement algorithm in parallel. The scheme reduces the complexity of the algorithm. As can be seen from experimental results, according to the needs of the encryption system, the system data processing speed and data throughput can be changed in real-time by changing the system clock.
Accuracy Improvement of GPS Positioning Based on GA-Aided Particle Filter
Authors: Wang Er Shen , Pang Tao , Zhang Zhi Xian
Published: January 2015

Aiming at the weight degeneracy phenomena in particle filter algorithm, a resampling method improving the diversity based on GA-aided particle filter was presented. Taking the advantage of genetic algorithm ( GA ) in selection ,crossover and inheritance to make up for the shortcoming of resampling. Genetic operation on particles in real number domain is adapted to reduce the complex of the genetic algorithm. And the evolutionary idea of genetic algorithm was combined with particle filter, by using selection, and mutation to improve the weight degeneracy and diversity of particle filter. This GA-aided particle filter was applied in the established GPS system nonlinear dynamic state space model. The experimental results based on the collected real GPS data is compared with the tradition particle filter, and compared with the effective number of particles and particle distribution. The experimental results indicated that the GA-aided particle filter can increase the number of particle, and effectively solve the particle degradation phenomena, the estimation accuracy of GA-aided particle filter is better than that of particle filter (PF).