bluuebunny/crossref_metadata_2025 huggingface dataset:
The Anti Corrosion Performance of the Fracture Surface by Fine-Blanking with Negative Clearance with ASTM-Gr.D
Authors: Li J.H. , Xiao Q.H. , Zhang H. , Li F.
Published: November 2012

The fine blanking with negative clearance is a process with characteristic of the high blanking precision and the better fracture quality, so the blanking fracture surface structure are intensity. This paper has carried on the contrast and analysis between common blanking and the fine-blanking with negative clearance fracture face and burrs zone cavity metallographic and further indicated the different process blanking work-piece fracture face characteristics, illuminated the anti-corrosion of blanking fracture surface between different blanking process by using corrupt principium. The anti-corrosion of blanking fracture face could enhance wear resistance of blanking work piece evidently. Therefore, it could improve fatigue strength and the working life of work piece greatly.
Research on Spectrum Domain White Light Interference Demodulation Mechanism of the Optical Fiber Sensing Coal Gas
Authors: Zhou Meng Ran , Ling Dong Yue , Ye Ying Liang
Published: November 2012

In our country, as the great threat caused by gas explosion or gas accident to the safety in coal mine production, the development of gas monitoring system is key to preventing accidents beforehand.. Putted into interferometer, the amplitude and the intensity of the incident ray carrying the information of gas concentration are divided many times by reflection and transmission, which results in many parallel beams in the form of the reflected light and the transmitted light. The concentration of the gas can be obtained by testing the light intensity signal . The experiment results show that an accurate measurement result which is capable for the gas concentration test in underground abominable conditions can be got by this mean. Particularly, based on multiplexing technique of optical fiber sensing, it is easy to build a sensor network. This method has an important significance and a good prospect of application and extension for gas monitoring and safety production in the coal mine.
Binocular Vision Measurement of Distance Based on Vehicle Logo Location
Authors: Hou A Lin , Chen Juan , Jin Zhi Juan , Liao Qing , Geng Ying
Published: November 2012

A measuring system of vehicle distance is proposed on the basis of binocular vision using location information of the vehicle logo. The spatial location of the target vehicle can be obtained by the pixel coordinates in the image plane due to the logo is sited at the central axis of the vehicle. The camera calibration algorithm is accomplished by conversion relation matrix between the world coordinate system and the image coordinate. And then the binocular logo image pairs are matched. Finally, the distance of the target vehicle is calculated. The simulation experiments have been done and the results show that the proposed method of distance measurement has better performance with rapid processing and higher accuracy.
A New Camera and Projector Calibration Method Based on Discrete Computation
Authors: Zhao Xue Jin , Zhang Cheng Rui
Published: November 2012

This paper presents a novel method for the calibration of camera and projector based on discrete computation, which uses a linear moving chessboard and project plane to get a calibration database for camera and projector. The camera database contains multi-layers data of the captured chessboard corners and their corresponding practical coordinates in the system. Then by using this database and interpolation algorithm, we can calculate the accurate position for each given pixel position in the captured image. After this we change the chessboard with a white scene and project a chessboard image to the plane. By capturing the projected image and computing the practical position for the corners in the image, we can get a relationship between practical coordinates and the projected image pixels. So another database for the project image and the practical coordinates is established. By using these two databases, we can define the light line for the pixels in a camera captured image and projected image, which can be used for 3D scanning system and other industrial systems, like mask-image projection stereo lithography rapid prototyping system.
Application on Sample Inspection Technology of Highway Electrical and Mechanical Engineering Detection
Authors: Chen Jian , Yu Jiang Hao
Published: November 2012

Sample technology is the effective mean of scientific, objective and economic quality inspection. The sample technology regulation and requirement of the present technical standard are mainly issued for batch products by the government. The sample method of the national and trade standards has been gradually paid attention by production companies, construction companies, supervision companies and inspection institutions, the accurate sample standards and the scientific sample methods have been increasingly identified by quality control companions, the further solution to sample inspection of mechanical and electrical engineering has been discussed combining with the actual engineering example.
Preparation of UV-Curable Nanocomposite Varnish with High Wear Resistance
Authors: Guo Bing Zhi , Zhao Yun , Liu Hong Bo , Huang Yang Jun , Feng Tong Ying , Jiao Qing Ze
Published: November 2012

To enhance the interfacial interaction in silica nanoparticles filled polymer composites , nano-SiO2 gel was prepared by a sol-gel route, and then it was modified in situ through a reaction of silane coupling agent with hydroxyl on the surface of SiO2. The modified nano-SiO2 gel was added to the system of light-cured varnish to prepare UV light-cured nanocomposite varnish. The structures and properties of varnish were studied using Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and film performance test. The results showed that the modified nano-SiO2 was well dispersed in the varnish. After introduction of modified nano-SiO2, the fracture morphology of varnish film showed a corrugated shape, indicating the ductile fracture. The wear resistance of the varnish film increased by 50%, the coefficient of static friction reduced about 15%, and gloss improved to some extent.
Design of Karl Fischer Moisture Virtual Analyzer Based on LABVIEW and MCU
Authors: Tian Ying Zhong , Jin Zhi Xiang , Wang Peng Chong
Published: November 2012

Karl Fischer moisture analysis method is regard as the best way to determine the water content of the substance, which is widely used in industry of petrochemical, food, cosmetic and so on. In order to improve the maneuverability of the method, reducing the costs and improve work efficiency, this paper presents a Karl Fischer moisture virtual analyzer (KFMVA) system, which using STC11F32XE MCU as the core of the system, combined with PC by the LABVIEW serial communication module, realized the data collection, processing, display, storage and print capabilities.
FFU Motors Group Control System Based on Wireless Sensor
Authors: Wang Yi Wang
Published: November 2012

A novel fan filter unit (FFU) motors group control system based on ZigBee wireless sensor networks is designed and implemented. The overall structure and composition of the proposed system were described. The design was achieved by software and hardware, used the digita1 signal controller (DSC) dsPIC30F3010 as the control core. The group system communicate by the use of ZigBee wireless sensor network based CC2531,which effectively overcome the traditional FFU fan group control network wiring complexity and high cost disadvantages, and improve the flexibility and control accuracy, meanwhile reducing system cost.The testing results show that the proposed system is feasible, accurate monitoring and control effectively, has the high valuable in engineering and marketing.
Research on Inductive Oil-Water Interface Level Sensor
Authors: Zhang Bao Sheng , Zhang Hui Li , Zhang Peng , Meng Chao
Published: November 2012

It is extremely important to know the water level in the subsea separators. Based on its highly tolerant behavior towards many different side-effects occurring in separators, inductive approach for measuring oil-water interface level is studied. The inductive sensor employed a couple of ferrite cores in the oil/water Mixture is designed. The experimental results shows induced voltage value in the second ferrite core increases with depth of core increasing in the water .The sensor has different sensitive degree to oil-water mixture under different frequency sign. The optimal frequency is from 60 to 80kHz .According to inductive voltage signal produced by a couple of ferrite cores, the oil-water interface level can be detected.
The Study of the Principle of Entrainment Effect of the Gas-Electric Measurement
Authors: Zhao Pei Feng , Zheng Xu , Wang Dao Shun
Published: November 2012

This paper study an method of extension the range of gas- electric measurement. Using the effection of the high speed air flowing into the throttle orifice make out an wide rang and not be affected by the fluctuation of the gas source pressure gas-electrical measurement .The measured value of using the differential pressure sensor is greater than the value of the gas source pressure, effectively increase the effective rang. C8051F350 microcontroller with built-in 24-bit resolution AD converter, 18b20 temperature sensor, RS485 bus, and industrial computer are used to make of measuring and controlling system .
System for Wave Compensation of Deep-Water Exploration Extraction Equipment
Authors: Chen Zhi Xin , Liu Shuai
Published: November 2012

In order to reduce the influence of the bench extraction equipment from the working deep-water exploration ship when it has swing or heave movement by wind and waves, according to the 3000m deep-water exploration ship work condition and the structural parameters, through analysing and calculating, wave compensation control system of deep-water exploration ship bench extraction equipment was researched. Modeling and simulation analysis were done used by dynamic system software Matlab/simulink which has the functions of modeling and simulation. So that displacement response simulation curve of wave compensation system was obtained, which can be utilized to analyze the motion compensation effect of bench further.
The Mo Loading Effect on SCR deNOx Performance for V-W-Mo/TiO2 Catalyst
Authors: Gao Yan , Luan Tao , Lv Tao , Xu Hong Ming
Published: November 2012

The V(1)-W(4.5)-Mo(x)/TiO2 catalysts was prepared by the incipient dry impregnation method. The catalyst samples were ground and sieved for 0.3~0.6 mm. The NO catalytic efficiency, selectivity against N2O of the catalysts were investigated on a fixed bed reactor under simulated exhaust gas with a typical gas composition. The addition of Mo enhanced the catalytic efficiency of V(1)-W(4.5)-Mo(x)/TiO2 catalysts at low temperature region, while lessened that at high temperature, especially at the temperature above 400 °C. Increasing the loading of Mo from 1.5% w/w to 4.5% w/w advanced the maximum catalytic efficiency from 78% to 99% and enlarged the temperature window of the catalyst. The acceptable NO conversion (>60%) was attained at temperature as low as 240 °C for V(1)-W(4.5)-Mo(7.5)/TiO2 catalyst. The presence of Mo promoted the N2O generation. The V(1)-W(4.5)-Mo(0)/TiO2 catalyst showed higher catalytic selectivity for NO compared to the catalysts loading Mo.
A Kind of Wireless Sensor Networks Applied in Public Services
Authors: Cui Chao , Wang Cheng You , Wang Liang
Published: November 2012

The network model of data collection in public services is different from other Wireless Sensor Networks (WSNs). The direction of its data transmission is single; and the communication between nodes is not frequent. The amount of data is little and transmission delay is allowed. Based on these special features of the network model in public services, we proposed a wireless-sensor network protocol applied to low-frequency bands. The network simulation software NS-2 is used to simulate and analyze the model
Beer Brewing Control System Based on DS18B20
Authors: Wang Shu Hai , Chen Shu Wang , Yan Xin
Published: November 2012

Beer brewing process has a very high demand for temperature. The beer fermentation process is the core, which is a very complex biochemical exothermic reaction. The temperature of the controlled object has a variability and uncertainty. Fermentation temperature determines the quality of the product. Therefore, we must control the temperature strictly during fermentation. The paper introduces the beer fermentation temperature measurement and control by using the DS18B20 temperature measurement system. Through the system we can significantly improve the technical parameters of the fermentation temperature, which can significantly improve the quality of beer. This system has a wide range of applications.
Tunable Magnetism and Half-Metallic Stability in Si-Doped Hg2CuTi-Type Ti2CoGa Alloy
Authors: Wu Bo , Feng Yu , Yuan Hong Kuan , Chen Hong
Published: November 2012

Using the ab-initio calculations within the density functional theory (DFT), we have investigated the electronic structure, magnetism and half-metallic stability of Si-doped Heusler compound Ti2CoGa with Hg2CuTi-type structure. The results revel that the lattice constants and total magnetic moments in per unit obey the Vegard’s rule and the Slater-Pauling rule well, respectively. The most stable half-metallicity occurs at doping concentration x=0.75 because the Fermi level is located at the middle of the spin-minority gap. Our studies also indicate that the competition between RKKY-type indirect exchange and direct hybridization of d-electronic atoms plays a dominating role in determining the magnetism.
Study of Chassis Dynamometer for Hybrid Electric Vehicle
Authors: Zhao Shu Peng , Tian Miao
Published: November 2012

The development of chassis dynamometer of hybrid vehicle based on CAN bus was studied. Chassis dynamometer of hybrid vehicle measurement methods and loading devices are analyzed, and laid the foundation for the resistance simulation of chassis dynamometer.Road resistance simulation on HEV chassis dynamometer is researched, getting electric quantity simulation type of chassis dynamometer driving resistance.The research and development of hybrid vehicle chassis dynamometer based on CAN Bus is conducive to enhance the level of whole hybrid vehicle and car assembly, establish the test procedures, test methods and test standards, provide a research platform and methods for test evaluation of HEV energy utilization.
Design of WSN Sensor Node for Solar Photovoltaic Modules
Authors: Yang Peng , Shen Chu Yan , Shi Wang Wang
Published: November 2012

Photovoltaic module is an important part of photovoltaic power generation, so the quality and reliability of Photovoltaic modules directly determine the whole (PV) power system’s stability. Design a JN5139 as control core based on the solar Photovoltaic modules of WSN sensor node. This paper firstly analyzes the sun batteries testing principle, then from two aspects of hardware and software this sensor node in detail, including hardware JN5139 timing acquisition by the output of solar cell piece voltage, current and bypass the diode loop current, judge battery slice of actual work; Software from main program respectively, AD son conversion program, etc are introduced. With the data of experiment collecting, the node is analyzed and evaluated.
Study on the Testing System of Far-Field Laser Energy Density Distribution
Authors: Yang Xu , Song Lu , Duan Jin
Published: November 2012

This study designs and develops a set of far-field laser spot energy testing system based on energy density detecting array. Through installing energy density detectors on the characteristic location of energy density target, the practical value of laser’s energy could be adopted. Meanwhile, by the use of visible light image equipment, the energy density distribution image of laser spot with a wavelength of 532nm on target surface could be obtained. After that, the energy density of each spot on the target surface as well as the energy density distribution have been figured out by fusing the grey level of laser spot image with the practical energy value detected by laser energy probes. The result shows that this system, which is simple, reliable, and available for the far-field laser energy density measurement under all circumstances, is capable of precisely measuring the far-field laser energy distribution with more than 1km with few measurement errors.
Earth Station Tracking SIGSO Satellite: Analysis and Discussion
Authors: Hu Zheng Qun , Lü Chang , Pei Jun
Published: November 2012

Earth station and satellite are important components of the satellite communication system, this paper analyses earth station antenna for the main measurement parameters, which include azimuth, elevation, satellite to the ground distance and AGC of beacon signal; explores the earth station antenna AGC servo tracking system; azimuth, elevation and AGC level value are calculated when the earth station in Peking aligns APstar-1 satellite. Experimental results show that the changing amplitude of azimuth, elevation and APstar-1satlellite drifts rate is increasing in the past years.
The Study of Error Separation in On-Site Measurement Based on Bayesian Network
Authors: Yan Li Wen , He Qi Bao
Published: November 2012

The measurement error contains many errors in NC machine tools processing and those errors will be mapped to workpiece at certain regularity. The control of error caused by cutting parameters during the precision and ultra precision process is one of the key technologies in NC machine tools processing. This article introduces Bayesian networks into the dynamic error separation modeling, with the learning process of Bayesian network structure and establishes the error separation model based on Bayesian networks, then carries out the comparison and analysis between simulate and experimental data to verify the feasibility of the method.
An Improved Mono-Station UWB TOA/AOA Positioning Method
Authors: Tu Xiao Dong , Zhang Hao , Cui Xue Rong , Liu Xing
Published: November 2012

The paper proposes a mono-station TOA/AOA positioning method based on ultra-wideband (UWB) antenna array. The article calculates accurately the signal's angle of arrival (AOA) by measurement of the UWB-pulse amplitude of the reference base-station antenna array received, combined with the antenna beam pattern. With the estimation of the information of arrival time using the skewness and the maximum slope, the location of the label can be found. The ranging error of the localization algorithm can achieve centimeter-level and angle of arrival is less than or equal to 1.0.In the paper, the accuracy of positioning method is not affected, eliminating the high-precision synchronization requirements of the traditional reference base-station and significantly reducing the system requirements of clock accuracy and system complexity.
Research on the Cr (VI) Absorption by Activated Sludge
Authors: Li Qiang , Han Sheng , Hao Da Ke , Wang Jia Jia , Luo Yan , Qu Yan Hong , Song Dong Xue , Hu Xue Ying
Published: November 2012

The adsorption performance of Cr (VI) on activated sludge and the effect of adsorption time, pH, temperature on the adsorption and desorption were studied. The initial pH is important for biosorption, and the optimum effect on Cr (VI) biosorption is acquired within initial pH of 0.5-1.0. Activated sludge has high efficiency of treating low concentration Cr (VI) wastewater. The removal rate of Cr (VI) could reach 99% when the total concentrations of Cr (VI) were 10 mg/L. The results of static test showed that the adsorption equilibrium was reached within 60 min. The biosorption process was fitted into Langmuir and Freundlich isotherm adsorption equations. It is presumed that the progress of biosorption was reversible adsorption and irreversible adsorption simultaneously, however the reversible adsorption was more important in the biosorption and the adsorption belongs to physics adsorption.
The Application Research and Experiment Analysis of Wire Rope Fault Detection
Authors: Gao Guo Hua , Wang Qian , Huang Xue Liang
Published: November 2012

According to the characteristics of the wire rope, this paper introduces some methods of flaw detection. The thesis takes flux leakage detection as core and develops the detection method which is effective and undamaged to study and analyze the wire rope. In order to improve the accuracy of signal detection analysis and the reliability of detection , this thesis has got abundant experimental signals of broken wire to denoise and decompose the signal with wavelet analysis.It extracted the fault signal characteristic parameters with wavelet reconstruction to judge the fault type for building fault signal sample datebase. The thesis eatablished a typical wire rope fault diagnosis system.
Intergranular Corrosion of Austenitic Stainless Steel
Authors: Lin Shu Xia , Bao Wen Ke , Gao Jun , Wang Jia Bin
Published: November 2012

In the paper, the characteristic of intergranular corrosion on austenitic stainless steel is presented. The principles and the influencing factors of intergranular corrosion are analyzed in detail. Furthermore, the effective measures to prevent intergranular corrosion are proposed. Finally, the evaluation methods of sensitivity to intergranular corrosion are introduced.
Development of Pumping Wells Electrical Facility Remote Monitoring Terminal Based on DSP
Authors: Yu Shi Zhe , Liang Guang Sheng , Lu Wen Bing , Zhang Chong
Published: November 2012

Aimed at the features of large quantity and wide distribution of oil wells, this paper designs a pumping well remote monitoring terminal based on the two way automatic communication technology (TWACS). Processing signals from voltage sensor and current sensor, the terminal obtains electrical parameters so as to remotely monitor the well electrical facilities. Meanwhile, the modulation time domain of signals is determined by matched filter，and then the demodulation of TWACS signal and the transmission of monitoring data are achieved through the other technologies such as cross-correlation algorithm.
Performance Loss Analysis for Neglecting the Weibull Clutter Texture in Wideband Radar Spread Targets Detection
Authors: Meng Xian Dong , Feng Gan Zhong , Wang Liang , He Zhi Ming
Published: November 2012

The problem of adaptive detection of spatially distributed targets or targets embedded in Weibull clutter with unknown covariance matrix is studied. At first, the texture and the speckle of Weibull clutter is researched, the texture expression is proposed base on the property of spherically invariant random vector (SIRV) , then the optimal detection statistics regards the texture of clutter as a certain function is derived, another detector regards the texture as an unknown deterministic parameter as a contrast. Next, the numerical results are presented by means of Monte Carlo simulation strategy. Assume that cells of signal components are available. Those secondary data are supposed to possess either the same covariance matrix or the same structure of the covariance matrix of the cells under test. In this context, the simulation results highlight that the performance loss of the two tests in different shaping parameter, then the influence of the Weibull clutter texture on detection performance of test is given.
Design of Ultrasonic Measurement System for BRRPO
Authors: Qu Meng Meng , Zhai Peng , Zhai Shao Peng
Published: November 2012

Bonding rate of ring and piston's ontology (BRRPO) is used to describe the bonding quality of inserted ring and piston's ontology. According to the basic principle of ultrasonic flaw detection, shape of inserted ring and nature of material, penetration method is utilized to detect the bonding quality. An ultrasonic measurement system is designed. The design consists of hardware and software. Controlling process of hardware has been designed legally and made the detection precise. The design of software, based on VC++, consists of accomplishment of basic functions, such as data collection and data processed, and some special functions, such as automatic detection.
Carbaryl Detection by Gold Nanoparticles Electrodes for Fruit Application Model
Authors: Kumlangdudsana Panittamat , Dubas Luxsana , Tuantranont Adisorn , Dubas Stephan Thierry
Published: November 2012

A new method has been developed for the determination of carbaryl pesticides, , in water and fruit samples using gold nanoparticles electrode conductivity detection. The effects of pH on the binding between carbaryl and humic acid (HA) and number of layer coated electrode were investigated and optimized. HA modified the polyelectrolyte multilayer thin films (PEMs) coating electrode was used to detect carbaryl. The current was decreased 4.75% after dipping in HA for 10 minutes. The current was decreased around 7.28% from the initial value after HA binding with carbaryl. The results demonstrated that the newly developed method was an efficient procedure for the detection of carbamate pesticides in water.
Design, Simulation and Characterization of Moly Permalloy Based Electromagnetic Sensor
Authors: Palianysamy M. , Raman M. , Mohyar S.N. , Norhaimi W.M.W. , Hatta R.M. , Sauli Z.
Published: November 2012

In this paper it is shown the design, simulation and characterization of Moly Permalloy based electromagnetic sensor in MEMS software. The dimension of the device is minimized to the smallest the software can simulate which is 1 micron. Total of 9 models had been simulated which differs in thickness of the material and designs. A new design was created to compare the results with the existing designs. The creation of the new design has given better results than the existing designs in terms of the current flow and the magnetic induction.
Research of Faulty Sensors Data Reconstructed for Liquid-Propellant Rocket Engines
Authors: Li Yan Jun , Peng Xiao Hui , Cheng Yu Qiang , Wu Jian Jun
Published: November 2012

In this paper, the data of faulty sensors reconstruct algorithm of liquid-propellant rocket engine is developed based on adaptive neuro-fuzzy inference system. First, the input parameters selected for method is according to regularity criterion and the relationships between each parameter; second, adaptive neuro-fuzzy inference system is train by normal test, finally, the fuzzy mode is validated by normal data and the data of faulty sensor is reconstructed. The results indicate that this algorithm can reconstruct the data of faulty sensors accurately and show that the fuzzy model approach has good performance in faulty sensors data reconstruct for LRE.
A Review of Vibration Monitoring as a Diagnostic Tool for Turbine Blade Faults
Authors: Abdelrhman Ahmed M. , Leong M. Salman , Saeed Somia Alfatih M. , Al Obiadi Salah M. Ali Al-Obiadi
Published: November 2012

Vibration monitoring is widely recognized as an effective tool for the detection and diagnosis of incipient failures of gas turbines. This paper presents a review of vibration based methods for turbine blade faults. Methods typically involved analysis of blade passing frequencies, and extraction of dynamic signals from the measured vibration response. This includes frequency analysis, wavelet analysis, neural networks and fuzzy logic and model based analysis. The literature reviewed showed that vibration could detect most types of blade faults on the basis that dynamic signals are correctly extracted using the most appropriate signal processing method.
A Novel Lane Departure Warning System Based on Surrounding View
Authors: Yang Zhi Chao , Hu Zhen Cheng , Na Jing Xin , Wang Tong
Published: November 2012

Lane departure warning system based on surrounding view is a human-made decision such as solution to avoid lane departure fatalities with low cost and high reliability. In this paper, the key parameters of time to lane crossing (TLC) and distance to lane crossing (DLC) are all calculated from image processing(the corner detect and the optic flow). In the warning module, two strategies are proposed to improve the reliability of the system. After adjusting the threshold values on abundance frames of consecutive images, the refined threshold of the two strategies are determined. Finally, the proposed strategies are incorporated into our lane departure warning system to be tested in off-line simulation. The results indicate the efficiency and feasibility of our system.
Dehydro-Aromatization of n-Hexane over Zinc Modified WC/HZSM-5 Catalysts
Authors: Wei Ai Ping , Shi Mei Qin , Ma Chun An , Chen Ning Ning
Published: November 2012

The aromatization of n-hexane was studied over Zn-WC/HZSM-5 catalyst prepared by impregnation and reduction-carbonization method. The effect of zinc content on aromatization selectivity of Zn-WC/HZSM-5 was investigated. The results show that the 1% Zn-WC/HZSM-5 was the most active catalyst attaining an aromatic selectivity of 35% at 550°C, which was much higher than that of WC/HZSM-5. It was found experimentally that a proper amount of Zn and WC resulted not only in the higher selectivity of aromatization of n-hexane but also in decreasing of coke deposition.
Research of Reliable Design of Printed Circuit Board Suited for Smart Grid
Authors: Liu Chuan , Huang Zai Chao , Wu Peng , Wu Zhi Gang , Chen Lei
Published: November 2012

Electric utilities faced with the prospect of increasing customer rates are seeking solutions to challenges presented by rising global energy demand, aging infrastructure, increasing fuel costs and renewable portfolio standards in light of climate change. Many consider Smart Grid to be one such solution. The most two significant characteristics of Smart Grid are self-healing ability and high reliability. As the bottom stage of development of Smart Grid communication system, the signal quality and self reliability of PCB design directly influence the entire performance of the communication system. This article focuses on analyzing reliable PCB design suited for Smart Grid communication system from power supply, thermal dispersion and trace routing.
Design and Implementation of a 12-Bit 100MS/s ADC
Authors: Fan Xiang Ning , Zheng Hao , Sun Yu Tao , Yan Xiang
Published: November 2012

In this paper, a 12-bit 100MS/s pipelined ADC is designed. Capacitance flip-around structure is used in sample and hold circuit, and bootstrap structure is adopted in sampling switch which has high linearity. Progressively decreasing technology is used to reduce power consumption and circuit area, where 2.5bit/stage structure is used in the first two stages, 1.5bit/stage structure is used for 3rd to 8th stages, and at the end of the circuit is a 2bit-flash ADC. Digital calibration is designed to eliminate the offset of comparators. Switched-capacitor dynamic comparator structure is used to further reduce the power consumption. The ADC is implemented by using TSMC 0.18m CMOS process with die area be 1.23mm×2.3mm. SNDR and SFDR are 65dB and 71.3dB, when sampling at 100MHz sampling clock. The current of the circuit is 96mA under 1.8V power supply.
Synthesis and Characterization of Pt-Sn/WC(O)/C Catalyst for Ethanol Electro-Oxidation
Authors: Zhu Ai Juan , Chu You Qun , Ma Chun An , Chen Zhao Yang
Published: November 2012

Pt-Sn/WC(O)/C catalysts with different Pt/Sn molar ratio have been prepared by microwave-assisted reduction method. In the synthesis, PtSn alloy was supported on WC(O)/C which was synthesized by the temperature-programmed carburization after the pretreatment of AMT precursor. XRD result shows that Pt particles are reduced successfully. Compared to the reflections of Sn-free sample, the diffraction peaks of PtSn alloy catalysts shift to lower angle slightly. The electrocatalytic activities towards ethanol oxidation reaction were investigated using cyclic voltammetry and chronoamperometry techniques in acid media. The sample of Pt3Sn2/WC(O)/C presents the highest peak current density (332.2 mA/mg-Pt) and stability.
The Research and Design of Card Reader Based on RFID
Authors: Wang Xiao Li , Tu Jing
Published: November 2012

This paper designed a RFID-based card reader system, which is based on Cortex-M3 LM3S9B90 chip controller, using MRC531 as the base station chip and Mifare1S50 as card read-write. The system realizes the identification and data reading and writing of Mifare1S50 card with a frequency of 13.56MHz, while it can also communicate with the host computer conveniently. The communications use open-source TCP / IP protocol stack LWIP.
Process Antenna Effect Elimination in Ultra Deep Submicron
Authors: Wu Xiu Long , Lin Zhi Ting , Meng Jian , Chen Jun Ning
Published: November 2012

This paper analyzes the mechanism of process antenna effect in ultra deep submicron IC physical design and provides the antenna ratio calculation method. A new elimination method of process antenna effect combined with clock tree synthesis is proposed. The elimination method minimizes the impact to the clock latency and clock skew by setting up reasonable constraint for clock tree synthesize. Finally, the elimination method is used during place and route of the physical design of a reconfigurable video decoder chip, which is based on TSMC 65nm low power technology. The proposed method eliminates the process antenna effect of the design effectively, also minimizes the impact to clock tree and chip timing to the least.
Calculation of the Transmission Frequency and Modulation Based on PD5000
Authors: Xiao Juan , Xia Ying Qing , Li Dan , He Peng Jun
Published: November 2012

A method that is used to calculate the transmission frequency and modulation of the On Board Unit (OBU) based on the baseband signal getting from PD5000 is introduced. The article focuses on the principle and the realization methods of this algorithm, and the hardware structure will also be introduced briefly
The Key Techniques on Micro-Assembly of Micro-Radio Modules
Authors: Li Wei , Wang Jie
Published: November 2012

Micro-assembly technology is one of important processing technologies to realize electronic equipments miniature and light with high performance and reliability. The key techniques in micro-assembly of micro-radio modules were discussed in this paper with analysis of their characteristics. Some suggestions in application of micro-assembly were pointed out in the end of this text.
Research on Tuning Characteristics of High Precision F-P Cavity
Authors: Wei Ming Fei , Wang Hui Qin , Yang Fang , Wen Hao
Published: November 2012

In microelectromechanical systems, F-P cavity is one of the most common structures, air cavity thickness of a F-P cavity is about a near wavelength, the thickness of the air cavity is less and the interference series is low, so the reflective phases of the reflectors have much influence on the peak wavelength. The linear relationship between the thickness of an air cavity in a tunable filter and the resonant wavelength is deduced and tested by numerical computation in the article. The research is of practical significance for the design of a F-P cavity tunable wavelength selector.
Research on Acquisition and Tracing Algorithm of GPS Receiver
Authors: Ma Wen Zhong , Wang Zhi , Li Yao Rong , Zhang Wei
Published: November 2012

An acquisition and tracing algorithm of GPS receiver is introduced. The shortage of time domain acquisition algorithm is pointed out by analyzing the composition of GPS signal and C/A code’s correlation property. Then the frequency domain acquisition algorithm is discussed. The carrier wave track loop and C/A code track loop are designed and the algorithms of them are determined. Using these two loops can get the navigation message, etc that used for positioning and navigation. The GPS raw intermediate data is processed and the satellites signals are acquired and traced in MATLAB, then obtain the navigation message verified the feasibility and availability of the acquisition and tracing algorithm.
Research on TWACS Interference Suppression Based on the RLS Algorithm
Authors: Chen Min , Lu Wen Bing , Zhang Chong , Zhang Liang
Published: November 2012

TWACS (Two Way Automatic Communication System) has advantages such as economical and practical use, strong interference capability, long transmission distance and so on. But the noise in China's industrial distribution power grid owns the characters of strong interference randomness and even annihilation of the modulated signal. So the noise has a negative impact on power line communication performance. While the adaptive filter does not need to know in advance on the statistical characteristics of the input signal and noise, and has nothing to do with the spectral characteristics of the input signal. Based on this, it’s premised that the modulation signal is basically known, and the signal beyond modulation domain is regarded as reference signal to design an adaptive filter applied to TWACS by referring to the block diagram of the adaptive filter model to adjust the variable parameters of the RLS algorithm. Finally, the field test signal simulations show good effect of the adaptive filter design
The Design of Contactless IC Card Reader in ETC
Authors: Li Dan , Xia Ying Qing , He Peng Jun , Xiao Juan
Published: November 2012

The device has the 13.56MHz radio frequency identification (RFID) reader feature, and it can be used in the reading and writing in the aspect with purchase secure access module (PSAM) card, embedded secure access module (ESAM) card and dual-interface user card in the Electronic Toll Collection (ETC) industry. This article focuses on the design of the antenna and external matching circuit of the contactless IC card reader, lists software architecture and communication process, and obtains the optimum matching circuit through analyzing the data got from Agilent vector network analyzer
Design of Redundant Parallel Power Supply Based on Integrated DC/DC Modules
Authors: Li Ran , Ding Rui , Min Zi Jian , Yuan Hui Mei
Published: November 2012

Taking into account the efficiency, cost-effectiveness and reliability of power supply, redundant parallel power supply controlled by microcontroller could be a good solution for us. This paper analyzes principles and traits of parallel current sharing structure. Then a design of redundancy parallel current sharing structure is introduced, which is based on integrated buck chip LM2678 and microcontroller MSP430. The design has good fault-tolerant ability, and its output voltage can be adjusted easily. The capability and feasibility of this design has been verified by the simulation and experiment.
A Fully Integrated 2.45G Semi-Active RFID Tag IC
Authors: Zhang Yan Zheng , Zhang Shi Lin , Mao Lu Hong , Xie Sheng
Published: November 2012

In recent years, radio frequency identification (RFID) microwave technology receives great attention because of its advantages, e.g. long identification distance, small size of antenna, high identification speed and strong anti-collision ability. RFID tag plays one of the most important roles in logistics, and therefore special attention should be paid to tag design. In this paper, we present a 2.45G semi-active tag design, which is compatible with ISO 18000-4. The proposed tag can switch the manners of working between active and passive. When the generated RF-power is sufficient to operate, the tag works as a passive tag, and low noise amplifier (LNA), oscillator (OSC) and power amplifier (PA) are cut off to save the whole chip power consumption mostly. Otherwise it operates in active mode using battery power, and the working distance is greatly increased as a result of using PA.
Hydrogen Permeation Behavior of 95S3Cr Casing with Wet H2S Environment
Authors: Zhang Qiu Li , Ji Zhen Jiang , Zhou Jun , Chen Xiang Yang
Published: November 2012

This paper discusses the amount of hydrogen permeation and corrosion rate of 95S3Cr casing in different time, and analyzes its morphology before and after corrosion. We conclude that hydrogen permeation increases with increases of corrosion time, and increasing speed is faster in the initial stages then slower. Corrosion rate is quickly dropped at the beginning and then gradually increased. Corrosion products are loose structure. Because of hydrogen permeate into the material, the cracks create. It accelerates the corrosion.
Target Localization for Distributed Multiple-Input Multiple-Output Radar Using Capon Algorithm with Diagonal Loading
Authors: Chen Jin Li , Li Jia Qiang , Zhu Yan Ping
Published: November 2012

The distributed multiple-input multiple-output (MIMO) radar can achieve the high- resolution capabilities of target localization by coherent processing, far exceeding the bandwidth-dependent resolution of traditional radar. The conventional beam former synchronizing the phase across the widely separated transmitting and receiving antennas creates high level sidelobes that causes ambiguity in target localization. The Capon beam former with lower level sidelobes for target localization suffers from the irreversible of the covariance matrix when the numbers of transmitting and receiving antennas increase. Thus, the Capon algorithm with diagonal loading is applied to distributed MIMO radar for target localization with lower level sidelobes. Simulation results are presented to verify the effectiveness of the proposed method.
A 75dB Programmable Gain Amplifier for Dual Mode Wireless Receivers
Authors: Fan Xiang Ning , Bao Kuan , Chen Da , Ma Liang Yi
Published: November 2012

In this paper, a programmable gain amplifier (PGA) is designed and implemented for GPS/Galileo and WCDMA dual mode receiver using TSMC 0.18μm CMOS technology. The 0-75dB variable gain range is obtained by cascading a 0-15dB variable gain stage and four 15dB fixed gain stages. An open-loop structured fully-differential amplifier with source feedback resistor is adopted in basic gain stage. Variation of gain is achieved by switch-controlled output resistor network. Gm-boost structure is used in main amplifier. A DC-offset canceller circuit using DC negative feedback technique is proposed to eliminate the DC-offset of the PGA. Post-simulation shows that the PGA has 0-75dB variable gain range, 1dB gain resolution and less than 0.3dB gain error; the minimum DC attenuation is about 15dB over the whole gain range; -3dB bandwidth at the maximum gain configuration is about 15MHz; differential output peak to peak voltage is greater than 1V; and the entire circuit consumes about 3.6mA current under 1.8V supply voltage.
Design and Analysis of a CPW-Fed Broadband Conical Conformal Antenna
Authors: Hu Zhi Hui , Jiang Yong Hua , Ling Xiang
Published: November 2012

A CPW-fed microstrip monopole antenna which is conformal to a conical surface is presented in this paper. It has a simple structure printed on a substrate with dielectric constant of 2.55 and thickness of 0.2mm. By the aid of electromagnetic simulation software of CST Microwave Studio, the main influencing parameters of the antenna are simulated and analyzed, the difference between planar antenna and conical conformal antenna has been discussed, and the optimized physical model has been achieved. The simulated result shows the proposed CPW-fed conical conformal antenna has a broad bandwidth property that covers from 6.2 to 20GHz(VSWR 2), and it is suitable for wideband radar applications.
Current Delivered by an STM Tip in Landauer-Büttiker Formalism
Authors: Satpathi Urbashi
Published: November 2012

When an STM tip is brought close to a nano sized sample then it can deliver (or draw) a current that is determined by the Landauer-Büttiker formalism in terms of the scattering matrix that gives partial local density of states. We show that, very paradoxically, the interference related term in this formula vanish in a quantum regime making semi-classical formula for injectance exact in some regime. We explicitly show how evanescent modes are responsible for this. This can have useful implications to experimentalists as semi-classical formulas are much simpler.
High Speed Data Transmission Using Coding
Authors: Hwegi Yousef , Hassen Nasser
Published: November 2012

The relible and fast data transmission over noisy band limitted channels is the basic requirment of digital communication and transmission system. Reliability considerations require that forward error correction techniques be used. This techniques find and correct limitted erros caused by a transport or storage systems. Such coding technique is therefore used to help compensate for signal degradation and provide increase in system capacity and reliability. In this paper, we analyze the performance of three codes which are the Reed Soloman Code, the convolutional code, and turbo code for the same signal that is corrupted by transmission channel. The type of channel considered in this work is the AWGN. For the same message length, the turbo code gives the best performance and the Reed Soloman Code gave the poorest performance when the signal is corrupted by AWGN channel.
Kinetic Analysis of Paper White Mud Dissolution at Constant pH
Authors: Zhao Jian Li , Zhang Bing Zhen , Han Kui Hua , Li Ying Jie , Niu Sheng Li
Published: November 2012

One of the most important steps in the wet limestone–gypsum flue gas desulfurization (WFGD) process is limestone dissolution, which provides the dissolved alkalinity necessary for SO2 absorption. Accurately evaluating the rate controlling step in sorbent dissolution process is important in the design and efficient operation of WFGD plants. In the present work, the kinetics of paper white mud(PWM) in dissolution process has been studied by using a pH-stat method. The results obtained indicated that PWM dissolution in WFGD conditions obeys the modified shrinking core model. PWM dissolution kinetics follows the film diffusion and surface reaction control and the rate controlling step of PWM is film diffusion control. The activation energies of PWM in film diffusion and surface reaction steps are 11.9±0.7 kJ/mol and 13.7±1.3 kJ/mol, respectively.
Simulation Research on Hydraulic Support Column System Based on AMESim
Authors: Zhu Jun , Yuan Feng , Wu Hong Xia
Published: November 2012

The working principle and process of the hydraulic support column system is introduced at first. The simulation model of the column system is established in the software of AMESim, and the parameters of the model are set according to the actual working conditions. The simulation curves of each working procedure are obtained, and the simulation results are analyzed. The conclusions will be essential references for the research on the entire support hydraulic system.
Feature Modeling and Classification of Halftone Image Based on Statistical Method
Authors: Wen Zhi Qiang , Zhu Wen Qiu , Hu Yong Xiang , Peng Zhao Yi
Published: November 2012

For problem of feature modeling on halftone image, three statistics methods, named gray-level co-occurrence matrix, autocorrelation function and spectrum statistics, are used to extract feature vector of various halftone images. Then, their classification performance is assessed by radial basis function neural network. A mass of experiments show the autocorrelation function is better than other two methods for classification on halftone image.
Modeling and Simulation for Hydraulic Breaker Based on Screw-in Cartridge Valves
Authors: Ye Xiao Hua , Miao Xiao Long , Cen Yu Wan
Published: November 2012

The distributing flow system with slide valves is generally used for nitrogen-inflating hydraulic beaker, but it has some main bad problems. To solve these problems, a new distributing flow system was designed by applying the technology of screw-in cartridge. Then, the system mathematical model for the hydraulic breaker was proposed, and the performance of hydraulic breaker was analyzed by simulation. The simulation results show the principle of the distributing flow system designed is correct and feasible, moreover established mathematical model is accurate and reliable. It provides a viable technical approach and theoretical reference for the development of high-performance hydraulic breaker.