bluuebunny/crossref_metadata_2025 huggingface dataset:
A Method for Weak Multi-Frequency Signal Feature Extraction Based on Chaotic Duffing Oscillator
Authors: Lu Heng Zhi , Lai Zhi Hui , Wu Tai Hu
Published: June 2014

In this paper, we study the scale-transformation weak signal detection method based on chaotic Duffing oscillator. Based on this, the frequency characteristics of the weak single-frequency signal with arbitrary frequency and initial phase can be extracted. Furthermore, we propose a signal frequency interception preprocessing method for analyzing weak multi-frequency signal. After combing the preprocessing method with the weak signal detection method based on chaotic Duffing oscillator, we further propose a novel detection method for weak multi-frequency signal. Based on this novel method, we can extract the frequency characteristics and initial phase characteristics of the weak multi-frequency signal. In this research, we also study the automatic detection of unknown multi-frequency signal. According to the numerical simulation, the novel method we propose in this paper is helpful to extract the frequency parameters and initial phase information of each signal component of the weak multi-frequency signal.
Design Knowledge Retrieval Research Based on Domain Ontology
Authors: Zhao Mei Jia , Wang Lei
Published: June 2014

In order to solve the problems that design documents have large amounts of knowledge but distributed in disorder and that designers can’t express the true retrieval intention, which lead to a lot of useless retrieval results, this paper studied a retrieval algorithm of design knowledge based on domain ontology, and a design knowledge retrieval model based on domain ontology was established. On this basis, considering from word frequency, interval feature and semantic extension, the weight of which were taken into account for establishing retrieved concept set and indexing feature set of design documents; And according to vector space model, an improved similarity algorithm was used to match these set .Ultimately, the design knowledge matching with the retrieval intention was obtained, and the recall and precision of knowledge retrieval was improved greatly, thus achieving the purpose of knowledge reuse.
Experimental Research on Photoresist Processing Micro-Structure of SU-8
Authors: Bu Yun Feng , Hou Zhi Wei , Sun Quan Ping , Zheng Xiao Hu
Published: June 2014

Process researching on high resolution and high ratio of depth to width of the negative photoresist (SU-8) process on micro-structure, by means of orthogonal experimental,drawing that the soft baking temperature and soft baking time have the greatest impact on the quality of the lithography. When the thick of photoresist is between 120μm with 340μm, the soft baking temperature is 90°C and the soft baking time is between 50min with 120min, the graphics quality is best. Then, analysis of characteristics of the ratio of high to depth on micro-structure electroforming shows that the mass transfer is the restrictive link of micro electroforming. Which can achieve the process parameters optimization of the lithography and electroforming micro-structure.
Nylon 66 / Nomex Composite Yarn Performance Analysis
Authors: Cao Gen Yang , Sheng Dan , Yang Kai , Lu Xue Feng , Xu Wei Lin
Published: June 2014

The embedded composite spinning technology was applied in spinning the composite yarn of polyamide 66 and nomex .The relationship of the polyamide 66 and nomex’s content with the mechanical properties of composite yarn and hairiness was discussed. The method of cluster analysis was applied in analyzing the four kinds of yarn’s mechanical properties. And the results show that when the confidence interval is 95%, the significance of two kinds yarns were greater than 0.05. There is no significant difference between the programs. While the analysis of the hairiness data showed that the fourth solution’s harmful hairiness was much lower that the first solution’s. Therefore, the best solution is the fourth solution.
Optimization of Tensile Properties Based on Spin Tool Shoulder Geometry for Friction Stir Welded 6061 Aluminum Alloy
Authors: Jean Ming Der
Published: June 2014

This study reported the statistical optimization based on Taguchi designed experiments to improve the tensile properties of 6061 Aluminum alloy by the friction stir welding (FSW) experiments. The morphology and the structure of the friction stir welded experiments were characterized by scanning electron microscopy. Based on analysis of variance, the impacts of control factors have been identified for the tensile strength of 6061 aluminum alloy by friction stir welding. Experimental results revealed that the defect free butt joints could be obtained by cylindrical-screw type of tool shoulder and the joints made with a cylindrical-screw type resulted in better tensile properties compared to the other two shoulder geometries. Furthermore, it was clear that the tensile properties are greatly improved by friction stir welded experiments in the Taguchi design, and these findings have achieved the desired values in regard to the friction stir welded Experiments. The proposed procedure was applied at friction stir welded experiments, and the implementation results demonstrated its feasibility and effectiveness to enhance the tensile properties by FSW .
Study on the Modification and Performance of Compressed Natural Gas Engine
Authors: Zeng Qi
Published: June 2014

To modify a diesel engine into a natural gas engine, the supplying system, intake system, ignition system, combustion system and post-processing system are redesigned to meet the requirements of applying natural gas on the engine. Then on the basis of calibration of basic ignition advance angle and volumetric efficiency of natural gas engine, bench test is done to study the velocity performance, load performance and universal performance, as well as a comprehensively evaluation on the performance of natural gas engine. The result indicates that the modifying of nature gas engine is reasonable as it achieves the application of CNG on the engine and a comprehensive performance of engine.
Thermal Cyclic Test Safety and Effectiveness Analysis Method for Astronautic Electronic Products Based on Thermal Simulation
Authors: Su Yu Tai , Fu Gui Cui , Gu Han Tian , Jia Mei Si
Published: June 2014

Thermal Cycle is a common test to ensure solder joints and interconnects reliability of astronautic electronic products through eliminating infant failures caused by latent defects. Both over-testing and under-testing risks have to be considered sufficiently during the constituting of thermal cyclic test scheme. Consequently, the methodology presented in this paper offers a novel way to evaluate these risks. Safety analysis on the thermal cyclic test scheme can prevent unnecessary operating life consumption, while the effectiveness analysis can ensure the sufficiency of the test and get rid of the defective products. Additionally, 3 thermal cyclic test schemes which can be applied on a signal acquisition board were analyzed with this methodology individually, and the most felicitous test scheme was identified at the end of this procedure.
Effect of Contact Interface Nonlinear Coefficient on Ultrasonic Transducer
Authors: Zheng Shu Li
Published: June 2014

The model of ultrasonic propagation through contact interface, which is an important factor in the ultrasonic transducer used in wire bond, was established by Hertz contact theory. From the Hertz contact theory, it is found that higher order harmonic wave and waveform distortion occur when the ultrasonic wave propagate through a contact interface between two isotropic solids pressed together. Based on the model, the effect of the contact interface between horn and capillary in wire bond transducer are tested by Laser Doppler vibrometer. The experiment results show that when contact interface pressure is in the range of 6 kPa to 10 kPa, higher harmonic wave and nonlinear coefficient is minimum. When contact interface pressure is more than 10 kPa, the nonlinear coefficient increases and bonding strength decreases as increasing of the interface pressure.
Design of Variable Valve Agency for Gasoline Engine Based on AVLBOOST
Authors: Ma Bin , Dong Wei , He Ling , Sun Ping
Published: June 2014

As an important technological means for engines’ low emission with high efficiency, variable valve agency is widely applied in the new-type machine’s R&D and the old-type machine’s modification. This paper applies AVL BOOST one-dimensional simulation software to the working process of the small displacement electronic control gasoline engine and proceeds with the analog simulating calculation. The data error between the calculated result and the original experiment one is less than 5%, so the calculation precision meets the requirements. As formulating simulation study programs and analyzing the valve timing parameters’ impact on the low-emission electronic control gasoline engine’s performances, this paper finds the intake duration angle, the exhaust advance angle, and the valve overlap, all receive big impacts; the original machine’s valve timing optimizes the treatment of working conditions with high speed while sacrificing the power performance of low-speed working conditions. On this basis, this paper designs the variable valve mechanism, and improves the original machine’s medium-and-low rotating speed’s torque by 10% or so.
Irradiation System Design of Rotating Painting Ink Curing Based on UV LED
Authors: Zhou Rui Hua , Tian Xiu Yun
Published: June 2014

The effects of painting ink’s color on UV absorptivity and UV-light wavelength on curing depth in the process of rotating curing are analysed. Aiming at radial uneven curing, the scheme is proposed that using the UV LED with wavelengths of 365nm and 395nm to form a fan-shaped array on cylindrical surface. The curing system can achieve UV irradiance be enhanced gradually along the radial, and the technique problem of uneven curing is solved. The simulation result shows that the curing system meets design requirements on Tracepro.
Simulation Study on Seismic Response of Different Rock Structures
Authors: Feng Zhi Ren
Published: June 2014

Seismic rock study aims to clarify the relationship between the rock and the intrinsic nature of seismic attributes contained in the fluid between the paper based on the physical characteristics of the rock, viscoelasticity and anisotropy of systems theory and media rock mechanics model response characteristics, and model simulation, simulation results show that the physical structure of the rocks we build the model can well reflect the characteristics of the seismic response of rock mechanics.
Research of a New Power Quality Detection System Based on ARM
Authors: Peng Yan Qing , Wang Feng , Zhang Ji , Li Jia , Zhang Da Min
Published: June 2014

Based on the comparative analysis of the fast Fourier transform (FFT), the short-time Fourier transform (STFT), the wavelet transform (WT) and other power quality detection algorithms, this paper puts forward to a new power quality detection algorithm which combines the Fourier transform with the wavelet transform. The transient as well as the steady state signals are separated on the basis that the wavelet transform is sensitive to the singular signals. The presented algorithm detects a variety of harmonic parameters of the gird after the separation of steady state signals is finished by fast Fourier transform. A new power quality detection system is then designed based on the core chip of S3C2440A, and the algorithm which is ARM-9 based is transplanted into the embedded Linux operating system to carry out the experiments. Analysis of the experimental data shows the detection algorithm is reliable by Fourier transform and wavelet transform.
Vulnerability Assessment and Analysis of Active Distribution Network Structure
Authors: Liu Da Chuan , Zhang Jian Hua , Wang Dan , Li Hai Nan , Zeng Bo
Published: June 2014

Owing to more and more people concern about environment issues and reduction of fossil fuels, a growing number of distributed generations (DGs) are being interconnected to the power system. The active distribution network (ADN) provides an effective way to achieve the large scale connection and efficient utilization of them. This paper analyzes the vulnerability performance of active distribution network quantitatively and discusses the impact of DGs on the distribution network transmission efficiency under different grid structure through the application of complex network theory in power system. The example results show that meshed network structure can effectively promoting the consumption of DG and verify the feasibility of applying complex network theory to the distribution network for vulnerability analysis.
Implement of Handling and Stability Road Test of Passenger Vehicle for ISO Standards
Authors: Guo Run Qing , Yuan Lin , Xie Jin Zhong
Published: June 2014

Vehicle handling and stability is a most important part of active vehicle safety. ISO standards on passenger vehicle dynamic test are analyzed. A corresponding set of road test system is established by introducing steering robot. And several export certification tests of ISO standards have been accomplished for Chinese independent brand automakers. The test data and characteristic figures are presented for a vehicle which shows good circular driving behaviour, steady transient response behaviour and road-holding ability and lateral stability according to ISO standards.
The Research of Hohhot City Integration of Urban and Ruralpublic Transportation Operation Organization Mode
Authors: Li Cheng Bing , Zhang Yi , Li Min , Li Xi Lu
Published: June 2014

With the urbanization accelerating, the development of integration of urban and rural public transportation has speed up. In that case, Hohhot city has become particularly important, but obviously, the development of Hohhot is still at a primary stage. And the these is about the development and integration of urban and rural public transportation in Hohhot city and the operation mode and operating mode line between the two areas are analyzed, combined with the fact of passengers flowing into Hohhot on line organization. We finally summarize the reasonable operation organization mode.
Bearing Replacement Monitoring Technology of Rail Transit Bridge in Beijing
Authors: Li Run Jun , Shan Ren Liang , Bai Shao Hong , Wu Xiao Jun , Han Ji Feng
Published: June 2014

To ensure the safety of bridge bearing replacement procedure, the project introduces the real-time monitoring technology. Collects displacement data, stress data, elevation and temperature are collected by displacement sensor, stress sensor and so on. Data processing and analyzing by the computer provides guidance for replacement procedure. The results of the monitoring and timely analysis of data collation provide guidance for the replacement process. Engineering practice results show that real-time monitoring technology is an important means to ensure the bearing replacement safe, but it should develop a reasonable scientific monitoring program.
Kinematic Analysis on the Clean and Jerk Action of the Chinese Elite Athlete Zhong Huang
Authors: Wang Ying , Wang Shuai , Zhou Ji He
Published: June 2014

We made a 3D camera resolution on the elite Chinese weightlifting athlete Zhong Huang, with the three-dimensional analysis we gained the kinematic parameters and found the problem of his technique, thus provide some scientific basis for the weight-lift training. The results show that in the barbell lifting stage, the distance of Zhong Huang’s hand is 69.6cm, a narrow grip and the depth of pre squatting is small. In the force stage, the angle of knee joint is relatively large, full squatting distance prolonging the working distance. In the squat support stage Zhong Huang had a good flexion of the hip and knee, in line with the "straight, stable, shallow" pre squatting requirements. In the stand up stage, Zhong Huang lifted the barbell and stood fast, which explains he had a good effect of force. In the jerk stage, he had an over bent of knee.
Studies on the Kinematics of Chinese Elite Man Hammer Athlete Throwing Technology
Authors: Jia Chong , Li Chang Dong , Ma Sheng Yi , Zhou Ji He
Published: June 2014

The purpose of this study is to provide the theoretical basis for the teaching and training of the hammer throwing and improve Chinese man hammer to reach world-class as soon as possible. This paper made a 3-D camera resolution on the top three men's hammer throwers in 2012 China Long Throw Open (Shizhu Wang, Kun Guo and Xiao Feng). With the comparative analysis on the related kinematic parameters of the world elite men's hammer throwers, it presents the main problems and gaps in China men's hammer throwers motion technology.
The Use of Information Technology to Promote Professional Development: Studies in Teacher Education
Authors: Bie Mei , Liu De Cheng , Xu Ya Xian
Published: June 2014

Using the information technology appropriately will positively affect the professional development of the teachers and, in turn, the educational reform towards the direction where we hope it to go. A survey about the teacher IT ability and training needs has been carried out from 2011-2013. More than 300 primary and middle school teachers are involved in our questionnaire and interview. Most of the teachers (76.84 percent) believe the improvement of the information literacy will be of great benefit their professional development.
Dynamic Model and its Application in Economic Forecasting
Authors: Yuan Jing Han
Published: June 2014

The economic system is an extremely complex system, internal systems affected by many factors, highly nonlinear, time delay and other characteristics. This has brought great difficulties to the economic modeling and forecasting system. This paper presents an improved modeling and forecasting methods, recombinant methods by introducing chain data and add data growth economic indicators in an artificial neural network training, the time series data input window to solve practical engineering problems forecasts.
Research on Amending the Energy Efficiency Provisions in the Building
Authors: Cui Hai Hong
Published: June 2014

The purpose of this paper is to identify the main requirements of the Building Regulations Part L1A for new dwellings. An explanation of the technical basis for energy rating is given including how they are calculated, how fuel costs are used, the role of the standard occupancy pattern, and an appreciation of the Building Research Establishment Domestic Energy Model (BREDEM). The aims and requirements of the European Directive on the Energy performance of Buildings and its implementation for new and existing domestic buildings is also considered. Design/methodology/approach – The requirements of Part L1A of the Building Regulations are developed. These relate to the thermal properties of the building fabric including insulation, thermal bridging, air tightness and glazing, the efficiency and responsiveness of heating and hot water systems, ventilation and lighting. The methodology for calculating thermal transmittance coefficients (U-values) is also demonstrated.
Signatures Extraction of Ship Radiated Noise Based on Passive Sonar
Authors: Wang Hong Ji , Yang Ri Jie , Han Jian Hui
Published: June 2014

By combining likelihood estimation method and Kalman filtering tracking approach, feature extraction algorithm was developed in this paper to extract the harmonic feature from the underwater noise radiated by different kinds of ships. The ability of harmonic features extrication algorithm is demonstrated by simulation and real shallow water data set comprised of a number of ships. The processing results of real data set also show that he harmonics of different kinds of ships can be used to separate from each other.
Speech Aerodynamics Parameter Extraction Platform
Authors: Lv Shi Liang , Jin Ya Sheng , Chen Xin Rui
Published: June 2014

The speech aerodynamics signal is one of the most important physiological signal in language research, plays an important role in human phonation process. Recently, there are a lot of equipment for speech aerodynamics signal research, mainly used in the field of medical research. But the supporting software can't satisfy the need of phonetics research. In this paper, according to the need of phonetics research, through the analysis of signal to KAYPENTAX speech aerodynamic devices, and used the MATLAB programming to establish the analysis platform to extracting parameters. The platform can read the NSP format file and output relevant parameters.
Crustal Thickness of Chinese Mainland Inversed by GOCE Satellite Gravity Data
Authors: Xu Hai Jun , Duan Hu Rong , Zhou Jian Ye
Published: June 2014

GOCE satellite gravity data is often used to compute gravity anomaly and geoid height. In the paper, GOCE gravity data is used to inverse the crustal thickness of Chinese mainland (E70°~130°, N20°~50°) in this paper. In order to test the reliability of the result, the computing result is compared with previous studies. The comparative analysis shows that the inversion result by GOCE gravity data has higher resolution and has good consistence with the previous studies.
A Regional Zenith Tropospheric Correction Model over Southern California Area
Authors: Liu Li Long , Zhou Miao , Zhang Teng Xu , Huang Liang Ke
Published: June 2014

In this paper, a new zenith tropospheric delay (ZTD) correction model is established by using 4 years of ZTD over Southern California, which not require any meteorological data and only related to the site’s elevation and the day of year. The results show that the stability and precision of the new model are better than Saastamoinen model using ECMWF date, and the precision increases along with increasing site’s elevation. The overall accuracy of the new model is about 3.86cm when used to predict zenith troposhperic delays in 2012 over Southern California area.
A Study of Composite Flow Meter Based on the Theory of Electromagnetic and Ultrasonic
Authors: Zhang Xi Te , Mao Qian Min , Nie Zhi Gang , Huang Zhen Wei , Shen Wen Xin
Published: June 2014

This thesis, under the guiding of electromagnetic and ultrasonic theory, tries to do numerical simulation based on the Fluent simulation software. The composite flowmeter (CFM) improves the accuracy of metrology on water flow and equipment itself with self-calibration and inter-calibration function. The aim is to calculate the average velocity of fluid on the cross-section at the electrode and the stability of flow field by researching on the influence of transducer. The result shows when the distance between two transducers is close, influences the flow field near the electrode, but when the product of two transducers distance and pipe diameter is around 4000, the average fluid velocity is close to the pre-selected fluid velocity and without any swirl. After comprehensive thinking on the structure influence of excitation coil, the transducer should been equipped on the same longitudinal section with the electrode.
Battery Powered Electromagnetic Flow Meter with Locally Shrunk Measurement Pipe
Authors: Liu Tie Jun , Zhou Min
Published: June 2014

Based on computer simulation, a new measurement pipe design with locally shrunk cross section is proposed for electromagnetic flow transducer. The efficiency of the magnetic field excitation circuit is effectively enhanced. The sensitivity of the transducer is increased. The transducer design is adopted in a battery powered electromagnetic flow meter prototype to reduce the power consumption. The prototype was tested. The feasibility of the proposed design was proved.
Gas-Liquid Two-Phase Flow Detection Techniques Based on Internal and External Tube Differential Pressure Flowmeter
Authors: Pang Li Li , Dong Han Chuan , Shi Yun , Fang Li De
Published: June 2014

The gas-liquid two-phase flow exists widely in nature and in our daily life, to realize the phase flow does not separate online measurement has become an important subject in the study. Through CFD simulation experiment, the optimal structure of inner and outer tube differential pressure flowmeter prototype. Through the analysis of the experimental data, comparison of the classical theoretical models found high Chishlom prediction model error is minimum. Moisture the modified model, the relative error of measurement is better than in the range of experiment 5%.
Study on Key Parameters of Ft-IMS Based on Simulation
Authors: Liu Ding Feng , Ni Kai , Zhang Xiao Guo , Wang Xiao Hao
Published: June 2014

Ion Mobility Spectrometer (IMS) is an effective instrument for detecting narcotics and explosives. Signal average IMS (SA-IMS) is used widely because it is relatively convenient to build. SA-IMS is low efficient in utilization of sample ions (1%), while FT-IMS is relatively high (25%). However, detailed discussions of several important parameters, such as frequency sweeping range, frequency sweeping intervals and gating function distortion, have not been made in previous studies. In this article, we build a numerical simulation model of FT-IMS, with which we appraised these parameters respectively. Main job of this article is done with MATLAB. We also propose several guidelines in building FT-IMS.
An Automated Measurement Method for High Speed Serial Data Validation
Authors: Jiao G.Y. , Liu Jun
Published: June 2014

A highly automated way for serial data validation is presented in this paper. The method is based on widely available Digital Storage Oscilloscope (DSO) and low cost Personal Computer (PC). Instrument automation with data capturing and processing is demonstrated. The method is able to process large amount of high speed serial data. The validation procedure is shown in this paper; two instrument automation control protocols are described; data processing algorithm in Python language is also discussed.
Laser On-Line Thickness Measurement Technology Based on Judgment and Wavelet De-Noising
Authors: Xu Qing Quan , Chen Gong , Zhu Xi Fang , Xu An Cheng , Yang Hui
Published: June 2014

Lithium battery coating thickness is measured by sensor using laser triangulation. The algorithm based on threshold judgment and multi-scale wavelet is realized for noise high-frequency reduction of lithium battery film thickness systems. The result shows that compared with the unique multi-scale wavelet de-noising, the method applies to different lengths and discontinuous of coating thickness measurement. .
CS Optical Pumping Magnetic Sensor Spectrum Lamp Drive Circuit Design Based on PI Feedback Controller
Authors: Tan Chao , Fang Li , Bai Xue
Published: June 2014

The optical source is one of the key components for the optical pump magnetic field sensor, its spectral width, stability and emission intensity directly related to the sensitivity of the sensor. The CS Spectral Lamp drive signal source was produced by crystal oscillator and amplified by the power controllable RF power amplifier. For achieving the aim of luminous intensity controllable and more stability, the reference controllable analog PI negative feedback control measures were used in the drive circuit. Contrast experimental result show that: the emission intensity of CS spectrum lamp is more stable and less affected by temperature if using the drive circuit which discussed in this paper.
High-Speed Storage Technology Applying to Photoelectric Theodolite
Authors: Li Juan Juan , Li Zheng Yan , Yang Dong Ping Gi , Cheng Quan Xi
Published: June 2014

With the development of measurement and control technology of range,it has proposed new requirements on storage ability. The paper introduces the significance of high-speed storage technology used in measurement and control technology of range.The paper also analyzes three application methods.The advantages of FLASH storage ways and the specific method are described in it.
The Research of Recognition System for Upper Limb Posture Based on 3-Axis Accelerometer and Gyroscope
Authors: Cai Xiang , Xia Chang , Zhang Yongbin , Chen Si , Tao Xin , Zhu Fu Gui
Published: June 2014

This paper is related to the design of an upper-limb motion recognition system based on a new-style MEMS sensor MPU-9150.In order to obtain more accurate deflection Angle, we describe the output of the 3-axis gyroscope and 3-axis accelerometer data with quaternion differential equations and then solving the corresponding equation through the timing incremental method and acceleration value separately. We can get two angles by solving the double integral values, then through the data fusion algorithm for two angle value processing to obtain the stable angle value. Verified, the results of this experiment have small error,had a high accuracy, stability and timeliness.
The Design and Application of Multiplex Ground Temperature Detection System of Low Power Consumption Based on CAN Bus
Authors: Liu Jin Mei , Yao Xiao Qiong , Liu Pei Pei
Published: June 2014

This paper introduces a kind of low power ground temperature monitoring system based on CAN bus, the detection system adopts DS18B20 temperature sensor as the detecting element, under a machine with low power consumption of processor MSP430 MCU multi-channel temperature data collection, PC processors SMT32 is adopted to improve the data receiving and analysis. The ground temperature detection system has realized the low power consumption, strong anti-interference ability, low cost, has wide use value.
A Security System Design of WSN Based on Nodes Identification
Authors: Jiang Jian Feng , Jiang Jian Feng , Zhang Xian
Published: June 2014

This paper introduces the design and implementation of the safe transmission mechanism of wireless sensor network. This scheme is aimed at reducing node’s cost of computing and communication. Firstly, the WSN will be clustered. Then, encryption key will be generated in the clusters, which is used of data encryption and decryption based on nodes identification to ensure data security. The system uses the wireless microcontroller CC2430/CC2431 to perform the simulation testing for program modules of Chipcon, which integrates CC2420RF wireless RF transceiver. Experimental results show that the new algorithm can increase traffic, node utilization and improve the confidentiality and security of sensor information.
Electrochemical Property of Graphene Oxide/Nafion/AuNPs Nanocomposite in Electrochemical Sensor
Authors: Li Jian Bo , Yan Yu Rong , Shen Bo , Li Yong Guo , Cheng Wei , Ding Shi Jia
Published: June 2014

Graphene oxide (GO)/nafion (Nf) film was immobilized onto the pretreated glassy carbon electrode (GCE) surface. Electrochemically reduced graphene oxide (ERGO)/Nf/AuNPs nanocomposite was synthesized by electrochemical reduction and deposition, which was characterized by cyclic voltammetry (CV) and square wave voltammetry (SWV). The experimental results revealed that the ERGO/Nf/AuNPs nanocomposite was stable, excellent, and homogeneous electrochemical property.
Measurement Method of Phase Characteristics for High Frequency Pulse Tube Cryocooler
Authors: Li Shan Shan
Published: June 2014

The phase characteristics of the high frequency pulse tube cryocooler which include the mass flows, the pressure amplitudes, and the phase angles between them significantly affect the cooler performance. A measurement method by using pressure sensors, temperature sensors and linear variable differential transformer rods is presented to evaluate and estimate the phase characteristics for the key components within the cooler such as the compressor, the regenerator, the inertance tube. etc, also the construction method of the phasor diagram based on the measurement is given. The constructed phasor diagram can be used to compare with the design values and provide the optimization direction of the prototype.
Piecewise Linear Response Based on CMV4000 Image Sensor
Authors: Meng Yang Yang , Hu Xiao Dong , Yang Dong Lai
Published: June 2014

With high speed CMOS image sensor CMV4000 produced by CMOSIS company as the object, after the thorough analysis of the piecewise linear response principle and how to extend the dynamic range, using piecewise linear response extends the dynamic range of CMV4000 image sensor. The ideas and methods of using the finite state machine designs piecewise linear response sequence are given, and the function simulation is done for the sequence in the Quartus II 9.0 environment using the Verilog HDL hardware description language. Through the analysis of simulation results, it can satisfy the demands of piecewise linear response sequence. The method is simple and feasible, and can improve the optical dynamic range of CMV4000 image sensor.
Edge Detection Using the Multi-Oriented Local Energy
Authors: Zhang Hua , Zhang Shu Yan , Wang Li Jia , Wang Guo Zhen
Published: June 2014

To detect the edge of object, an efficient scheme based on the Multi-Oriented Local Energy (MOLE) is presented. The MOLE is constructed by Multi-oriented Gaussian second differential and its Hilbert transformation. The Multi-oriented Gaussian second differential is obtained by using a linear combination of basis filters with arbitrary orientations. To overcome the affection of illumination, Phase Congruency is employed by normalizing the directional energies. At last, our method is compared with other common methods. The experimental results reveal that this method can extract more continuous edge and obtain more details.
Research on Intangible Cultural Heritage Based on Motion Capture
Authors: Chen Si Xi , Chen Shu
Published: June 2014

The application of digital technology on the protection of intangible cultural heritage is a major topic of research in recent years. The motion capture technology of protection will gradually replace the traditional recording methods such as texts, pictures and videos. It is valuable to build a high-fidelity, high-modular and low-cost digital platform for choreographic data collection and extended application. This paper studies the intangible cultural heritage of Quanzhou breast-clapping dance, one of the most famous choreographic intangible cultural heritages from China with standard optical motion capture method. The data are acquiring and processing after the dance motion capture, we binds the motion data and three-dimensional model using Motion Builder and build digital demonstration platform base on an OGRE engine to display the movements. The viewer can view at any angle and distance. The system can be easily applied in motion intangible cultural heritages protection project. Furthermore, the system can be provided versatile motion data for additional use.
Rock Classification Based on Image Processing and Neural Networks
Authors: Wei Xin Shan , Rong Chun Long , Nan Jun Xiang , Cheng Guo Jian , Liu Ye
Published: June 2014

For the identification complexity of rock microstructure, based on numerical analysis of rock section images, an automatic rock texture classification method and identification system is proposed in this paper. Digital grey image processing of rock thin section is used for features extraction, the features are then as inputs to the neural network model, the model output is the rock microstructure classification. 100 pieces of rock section images from Sulige region in Changqing Oilfield are used for the experiment; the whole dataset is randomly divided into 70 images for training datasets, 15 images for validation datasets and 15 images for testing datasets. It is shown that the correct classification rate for automatic identification of rock microstructure is about 93.3%. Therefore, the proposed method for solving geological problem is effective and can get a good identification performance for rock microstructure classification quickly and accurately.
The Hardware Design on the System of High-Speed Image Gathering Based on FPGA and DSP
Authors: Tian Yuan , Hu Chun Hong , Lu Jian Hua , Dong Qing Wei
Published: June 2014

On the foundation of analyzing in an all-round way to the current application situations and development trends with image acquisition and treatment technology on domestic and international, the paper designed one system that aim at the problems including high-speed rate of analog-to-digital conversion, heavy amount data and complicated arithmetic and so on that existing in high-speed image acquisition board and realize the high-speed acquisition and processing of image. The key part of the system is DSP and programmable arrays device FPGA, The main circuit including the standard video signal separation circuit, A/D converter circuit, phase locking multiple frequency circuits and the DSP, such as power supply circuit, etc. The circuit is simple, dependability, and have certain common ability.
An Evolution Algorithm for Satellite Range Scheduling Problem with Priority Constraint
Authors: Li Yu Qing , Wang Ri Xin , Xu Min Qiang
Published: June 2014

The satellite range scheduling problem is one of the most important problems in the field of the satellite operation. The purpose of this problem is finding the optimal feasible schedules, scheduling the communications between satellites and ground stations effectively, in another word. The problem is known for its high complexity and is an over-constrained problem. This paper present the resolution of the problem through a Station Coding Based Evolution Algorithm, particularly with the priority constraint, which adopting a new chromosome encoding method based on arranging the tasks in the ground station ID order. Computational results and analysis are presented for the case of the multi-ground stations scheduling.
Semi-Uniform Solution for Common Algorithmic Problem by P System in the Minimally Parallel Mode
Authors: Niu Yun Yun , Wang Zhi Gao
Published: June 2014

It is known that the Common Algorithmic Problem (CAP) has a nice property that several other NP-complete problems can be reduced to it in linear time. In the literature, the decision version of this problem can be efficiently solved with a family of recognizer P systems with active membranes with three electrical charges working in the maximally parallel way. We here work with a variant of P systems with active membranes that do not use polarizations and present a semi-uniform solution to CAP in the minimally parallel mode.
Research on the GPS Elevation Fitting with RBF Neural Network Model Considering Effects of Sample Data Preprocessing
Authors: Liu Li Long , Li Jun Yu , Cai Chen Hui , Lin Guo Biao
Published: June 2014

RBF neural network and three kinds of preprocessing methods are introduced, and this paper used these preprocessing methods combined with RBF neural network and strict RBF neural network to perform elevation fitting. Comparing and analyzing the fitting results, the results show that preprocessing methods can affect elevation fitting results. Centralized preprocessing data maximum improves RBF neural network elevation fitting precision, and it also let RBF neural network have stronger generalization ability. Normalization preprocessing methods are not necessarily optimal. It is essential for us to choose preprocessing method to fit the elevation.
The AC Multi-Harmonic Magnetic Susceptibility Measurement Setup at the LNF-INFN
Authors: Wang Sheng Hao , Marcelli Augusto , Gioacchino Daniele Di , Wu Zi Yu
Published: June 2014

The AC magnetic susceptibility is a fundamental method in materials science, which allows to probe the dynamic magnetic response of magnetic materials and superconductors. The LAMPS laboratory at the Laboratori Nazionali di Frascati of the INFN hosts an AC multi-harmonic magnetometer that allows performing experiments with an AC magnetic field ranging from 0.1 to 20 Gauss and in the frequency range from 17 to 2070 Hz. A DC magnetic field from 0 to 8 T produced by a superconducting magnet can be applied, while data may be collected in the temperature range 4.2-300 K using a liquid He cryostat under different temperature cycles setups. The first seven AC magnetic multi-harmonic susceptibility components can be measured with a magnetic sensitivity of 1x10-6 emu and a temperature precision of 0.01 K. Here we will describe in detail about schematic of the magnetometer, special attention will be dedicated to the instruments control, data acquisition framework and the user-friendly LabVIEW-based software platform.
Design and Kinematics Analysis of a Novel Planar Parallel Mechanism
Authors: Zhang Yan Bin , Wang Hui Ping
Published: June 2014

A novel 3-dof planar parallel mechanism, which is composed by three different limbs, is designed. The moving platform can translate along two directions and rotate around one axis with respect to the base. Mobility of the mechanism is discussed and calculated based on the screw theory. The forward and the inverse analytical position equations are derived and the veloctiy analysis is addressed too. The Jacobian matrix is an identical one, so there exists one-to-one corresponding linear controlling relationship between one of the actuated joints and one of the outputs of the platform. Moreover, the condition number of the Jacobian matrix is constantly equal to one and the mechanism shows fully-isotropic throughout entire workspace.
Implementation of Encoder, Foot Sensor and Walk for Imitation Control of Biped Robot
Authors: Cui Yi Feng , Byun Jung Hee , Shon Su Goog
Published: June 2014

Programming a biped robot to walk is a challenging issue in robotics. For a stable gait, prior knowledge of the robot’s physical parameters and sophisticated control algorithms are required. Robot walking by imitating a human gait becomes new challenging issues. Using a human motion data to the robot’s walk is convenient even though direct usage of the data usually results in dynamically unstable motion. The purpose of this paper is to develop a new type of encoder and foot sensor for biped imitation control system, which is direct and real-time sensor system. Characteristics of the sensor system are discussed. Finally, the operator’s joint motion can be imitated to the robot by using the new type of wearable encoder sensor. CoP through the developed foot sensor can be obtained and utilized to walk.
MANET-Based Stable Clustering Algorithm and its Performance Analysis
Authors: Hou Guo Zhao , Wang Jin Biao , Wu Jing
Published: June 2014

In MANET, MSWCA is a typical algorithm in clustering algorithms with consideration on motion-correlativity. Aiming at MSWCA’s problem that “it only considers on intra-cluster stability, and neglects the inter-cluster stability”, a MANET-based stable clustering algorithm (MSCA) was proposed. Firstly, MSCA clustering algorithm and its cluster maintenance scheme were designed. Secondly, the theoretical quantitative analyses on average variation frequency of clusters and clustering overheads were conducted. The results show that MSCA can improve cluster stability and reduce clustering overheads.
Study on Passivity-Based Control of TNPC PV Grid-Connected Inverter
Authors: Zhang Bai Le , Wang Jiu He , Zhao Feng Jiao
Published: June 2014

Euler-Lagrange (Euler-Lagrange, EL) mathematical model was established according to the topology of TNPC (T-type Neutral Point Clamped) PV grid-connected inverter. Based on the mathematical models and passivity-based control theory, the approach called injecting damping was adopted to design the passivity-based controller of the inverter. The passivity-based controller can decouple d-q axis current at AC side of the grid and achieve unity power factor, the total harmonic distortion of grid-connected current is low, and the passivity-based controller also make the inverter have good dynamic and static performances. Simulation results show that the designed passive controller of TNPC PV grid-connected inverter is feasible.
Design of Circuit for Alcohol Measurements Using Three-Electrode Biosensor
Authors: Hu Xiao Ping , Gong Qi Yong , Yuan Heng
Published: June 2014

This article designed a circuit for alcohol measurements based on three-electrode biosensor. The circuit system includes MCU controller circuit, potentiostat circuit, scanning voltage circuit and current detection circuit. Potentiostat circuit is designed to keep voltage of working electrode constant. Scanning voltage circuit is to generate reference voltage by DA converter chip. Current detection circuit measure the response current on working electrode. The system can measure the current with the value less than 10-9A, and the degree of accuracy of current can reach below 0.01uA. Different alcohol concentrations are tested based on this system and this system can get the concentration value of alcohol by the corresponding I-t curves.
Smart Community Security System Based on Sensor Web
Authors: Liu Ya , Mao Jian Hua , Liu Xue Feng
Published: June 2014

The traditional smart security systems have poor extensity, delayed alarm systems, and cannot be controlled through the remote network. To solve the shortcomings, this article proposed a smart security system based on Sensor Web. The system used Sensor Observation Service to achieve the data transmission and storage in real time. Users can send requests to Sensor Observation Service to get home environment information in real time via Internet. The system also implemented Sensor Event Service, so that users can get home security alarm information in real time by subscribing the events they are interested in.
Real-Time Trajectory Control of Robots Omnidirectional Mobile Obstacle Avoidance
Authors: Chen Xiang Hua , Zhou Juan
Published: June 2014

On the basis of Dick Stella algorithm and Bessel Curve, this paper proposes an improved algorithm for real-time obstacle avoidance control of mobile robots. With strong robustness, this algorithm can effectively solve the problem of robot path planning and tracking while meeting the dynamic constraint conditions. The simulation results show that the improved algorithm shortens the robot moving period and remarkably improves the motion planning in robot obstacle avoidance.
FEM Analysis of Sheet Incremental Forming Process
Authors: Liu Jie
Published: June 2014

Sheet incremental forming is a new sheet metal dieless forming technology. This paper introduced the fundamentals of the sheet incremental forming process. Based on the principle of “layered manufacture” in rapid prototype technology, this process resolves the intricate three-dimensional geometry information of the workpiece into a series of two-dimensional data, which can be used by an NC system to control a forming tool to make a curvilinear movement over the raw sheet metal layer by layer until the component wanted is formed. This paper introduced the sheet incremental forming system and metal digital forming technology. An FEM model of the incremental forming process is established, and a typical process is analyzed to instruct the parameters selection and the optimization of the forming tracks.
Torque Converter Turboshaft Fracture Failure Analysis and Improvement
Authors: Zhang Lei , Chen Xi Bao , Shan Hong Bo , Wu Xue Lei , Zhao Yan Min
Published: June 2014

Torque converter turboshaft is a hydraulic mechanical transmission devices of key components. In a new-mounted hydraulic mechanical transmission, super heavy laden vehicle during the test, the torque converter turboshaft fracture occurs when the vehicle traveling to 13 00 km, resulting in transmission power interruption, chassis parking problems. To achieve accurate positioning of the torque converter turboshaft fracture failure reasons, this paper analyzes the means of optical microscope and scanning electron microscopy, carried out on the fracture failure analysis, then using classical and finite element method to calculate the turboshaft intensity of the strength, and proposed optimization improvement program based on the cause of failure.
Research on Audit Model of Users’ Operation Normalization Based on Graph Theory in Power System
Authors: Zheng Ling , Zhang Dong , Cheng Bo Hao
Published: June 2014

Users’ correct operations should be abstracted into the data which can be stored in computer. So we need model users’ operation. Power industrial control system is a closed system. It has specific operations. By analyzing, abstracting, modeling the manual of users’ operation procedures and storing it in the computer, we can audit users’ procedures through the already defined operation flow.