bluuebunny/crossref_metadata_2025 huggingface dataset:
The Near-Field Correction Method of the Basic Array Error Based on a Single Auxiliary Vector Hydrophone
Authors: Chen Huan , Xu Feng , Yu Da Hai
Published: November 2012

The basic array error correction method based on a single auxiliary vector hydrophone is proposed for the difficult problem of the basic array error correction and the constraint of the space size of the tank. This method used the single vector hydrophone by precisely correction to implement non-fuzzy joint estimation of the source orientation and the orientation dependence of the basic array amplitude-phase error, and correct the error of the array element location. The method of this paper is applied to the arbitrary array structure, which doesn't exist the local convergence problem of the joint parameter estimation, only needs one-dimensional search for parameters which make the computing time less and can complete online in real-time.At last, the computer simulation verified the effectiveness of this method.
Complex Dynamics in the Kummer-Olsen Model of Calcium Oscillations
Authors: Wu Zheng Fei , Zhou Yi
Published: November 2012

Oscillations of cytosolic calcium concentration, known as calcium oscillations, play a vital role in providing the intracellular signalling. These oscillations are explained with a model based on calcium-induced calcium release (CICR). The nonlinear dynamics of the Kummer-Olsen calcium oscillation model is discussed by using the center manifold theorem and bifurcation theory, including the variation in classification and stability of equilibria with parameter value. It is concluded that the appearance and disappearance of calcium oscillations in this system is due to supercritical Hopf bifurcation of equilibria. Finally, numerical simulations are carried out to support the theoretical analysis of the research. By combining the existing numerical results with the theoretical analysis results in this paper, a complete description of the dynamics of the Kummer-Olsen calcium oscillation model has now been obtained.
Simulation Research on Defects Detection in Straight Pipes Using Guided Waves
Authors: Cui Ai Qiang , Zhou Shao Ping , Lv Wen Chao , Liu Chang Li
Published: November 2012

Ultrasonic guided wave provides a suitable fast screening technique that enables the localization of the defects and offers a rough estimation of the defect size in pipes. Using the ANSYS, the entity model of a pipe with defects such as cracks and holes was established in this paper. Then the L(0,2) mode guided wave was excited by exerting symmetric displacement loads on an end of the pipe model. By analyzing the incident wave and the reflected wave of defects, the axial location and circumferential location of the defects can be reached. Besides, by fitting the data with some certain formulas, the relationships between reflection coefficient and the defects extent can be acquired. This new technique is of great significance in nondestructive detection.
Chirp Signal Time-Frequency Analysis Characteristic Comparison
Authors: Zhou Jing Lei , Wang Fan
Published: November 2012

Chirp signal is a typical non-stationary signal, and have been widely used in communication, sonar, radar and so on. So, this signal is worth to analysis. In order to show the characteristics, this paper first introduces the definition and formula of each algorithm, then with all kinds of time-frequency analysis method to the signals, and the signal to add two sine signal noise are analyzed, the comparison of the characteristics of the method in the paper, and the signal for the analysis, the selection of an appropriate analysis. Through analysis and comparison, when dealing with the signal, Hilbert-Huang transformation not only has a better gathered characteristic, but also has a better resolution to distinguish the sine signal noise. Finally, use the MATLAB software simulation to obtain the result.
Dynamic Modeling for a Thin Plate with Large Deformation
Authors: Zheng Tong , Zhang Ding Guo , Zhu Jian
Published: November 2012

In this paper, based on the nonlinear elastic theory, dynamic modeling for a thin plate with large deformation is proposed considering high-order deformation terms using hybrid-coordinate formulation. Through the calculation the potential energy and kinetic energy of the plate, rigid-flexible coupling dynamic equations is established. It is shown that the difference between the deformation results obtained by the present high-order dynamic model and those obtained by one-order approximate dynamic model is not significant in case of large deformation ,both them can calculation large deformation problem. However, the amplitude of vibration obtained by the present high-order dynamicmodel is smaller than that obtained by one-order approximate dynamic model. Furthermore, dynamic stiffening and softening effect of the rigid-flexible coupling system undergoing translational large overall motion is investigated. It is shown that with the reduce of the modulus of elasticity, the influence of the translational acceleration on the vibration frequency of the rigid-flexible coupling system is more significant.
Group Delay in Digital Filter Induced Instability of a Two-Dimensional Airfoil Active Flutter Suppression System
Authors: Yu Ming Li
Published: November 2012

The presented paper deals with the group delay in the digital filter induced instability of a two dimensional airfoil section active flutter suppression system. Firstly, the aeroelastic model of the airfoil with an ultrasonic motor actuated control surface is set up; secondly, both H∞and μ robust controllers are designed; and then, the group delay induced instability in wind tunnel test is presented; finally, through a combined theoretical and numerical study, the test phenomenon is well explained. Wind tunnel experiments and numerical simulations demonstrate that long enough group delay in digital filter can induce instability of flutter control system, the flutter under control will decrease first, and then become another flutter of lower frequency and moderated amplitude, and μ controller works better than H∞controller on the same condition.
A Hybrid Finite Element-Analytical Approach for Dynamic Analysis of a Micro-Resonator Driven by Electrostatic Combs
Authors: Song Mi Tao , Cao Deng Qing
Published: November 2012

Combining the finite element method and the analytical method, a hybrid finite element-analytical approach is established to calculate the nonlinear dynamic responses of a micro-resonator driven by electrostatic combs accurately for the purpose of programmed dynamical simulations and great shortening of workloads. The spatially discretized equations obtained by using the analytical undamped global mode functions to the nonlinear integro-partial differential equations and the ordinary differential equations of the micro-resonator, in which the coefficients are estimated by the discrete global mode shapes from the finite element method, are used to calculate the nonlinear dynamic responses of the micro-resonator. The results are compared with those merely based on the analytical mode functions of the micro-resonator, which shows that they can reach high accuracy when the elements in the micro-resonator are sufficiently small.
The Current Situation and Recent Advances of Deep-Water Floating Wind Turbine
Authors: Chen Yu , Li Chun , Gao Wei , Nie Jia Bin
Published: November 2012

Offshore wind turbine is a novel approach in the field of wind energy technology. With the rapid development of coastal wind farms, it is the trend to move them outward to deep-water district. However, the cost of construction rises significantly with the increase in water depth. Floating wind turbine is one of the efficient methods to solve this problem. The early history, current status and cutting-edge improvements of overseas offshore floating wind turbine as well as the shortcomings shall be presented. The concept designs, international standards, fully coupled model simulations and hydrodynamic experiments will be illustrated and discussed together with the development of the theory and the related software modules. Thus a novel researching method and concept shall be presented to provide reference for future researches
Real-Time Calculation of Noise Radiated by Ship Structure via Machinery Exciting Force Estimation
Authors: Lu Ding Ding , He Lin
Published: November 2012

A method which combines the estimation of machinery exciting force and mechano-acoustical transfer function is proposed in this paper to predict real-time radiated noise by ship structure. The measurement methods of mechano-acoustical and mechano-vibrational transfer functions which are used in radiated noise calculation are described. The feasibility and accuracy are verified by an underwater model experiment. Measurement and calculation results are consistent. The average error of the exciting force estimation is about 2dB, and the average error of radiated noise pressure calculation is about 3dB. The accuracy of the radiated noise calculation is directly affected by exciting forces estimation errors, which can be corrected by a correction factor to increase the accuracy of radiated noise calculation effectively.
Investigation of Annealing on the Structural and Optical Properties of Chemical Bath Deposited ZnSe Quantum Dot Thin Films
Authors: Chen Liang Yan , Fang Chao
Published: November 2012

ZnSe thin films were obtained through chemical bath deposition method. Structural and optical properties of as deposited and annealed samples were investigated by X-ray Diffraction and spectrophotometer. The as deposited thin films were in nanocrystalline, with lots of strain and a blue shift of optical band gap. After annealing, the crystal grain gained, the strain eased and optical band gap enlarged. And it suggested that annealing can ease the quantum effect of chemical bath deposited ZnSe thin films.
Development of Diesel Engines’ Thermal Balance Test and Analysis System
Authors: Lv Yi Dan , Cheng Yong , Li Quan Wu
Published: November 2012

Based on the characteristics of high power diesel engines’ thermal balance analysis, a diesel engines’ thermal balance test and analysis system is developed through dealing a large number of test data. This system can real time monitor the temperature, pressure and flow rate of the components in cooling circuit, fuel circuit and gas circuit, can continuously record and store the state parameters, can realize theory computation, statistical analysis, query, and print data report. Also the system can realize remote operation. This system has already been operated in several enterprises. Results show that the system can estimate diesel engines’ thermal balance effectively. According to the analysis results, diesel engines’ designers can estimate the components that bearing excessively high thermal load and can solve the thermal balance problem of high power engines.
An Improved Method for Short-Term Power Load Forecasting Based on Fractal Extrapolation
Authors: Liu Ying , Zhai Ming Yue , Lu Li Peng , Liu Yong Xiao
Published: November 2012

Load forecasting based on fractal extrapolation is a very important method. However, traditional methods exists several disadvantages such as vertical scale factor difficult to calculate, low-precision, difficult to use. Therefore, a method is proposed combined with self-similarity theory and fractal extrapolation theory to solve the above problems. In this paper, the self-similarity of electrical load historical data is analyzed using multi-resolution wavelet firstly. Then use the Hurst parameter values to calculate vertical scaling factors based on the values of Hurst parameter and the other four parameters of Iterative Function Systems (IFS) affine transformation. At last the electrical load forecasting curve was generated by the iterations system. Considering the actual practical application, the algorithm was used to forecast electrical load based on fractal extrapolation. The computer simulation resulted that this algorithm has advantages of high-precision, less-sample demands, less-interpolation points and easy to use.
Influence of Pressure on the Performance of Heat Exchangers in Ammonia-Water Based Power Cycles
Authors: Kim Kyoung Hoon , Han Chul Ho
Published: November 2012

Recently the power generation systems using ammonia-water binary mixture as a working fluid have been attracted much attention for efficient conversion of low-temperature waste heat sources to useful energy forms. In this work, ammonia-water based Rankine (AWR) and regenerative Rankine (AWRR) power generation cycles are comparatively analyzed by investigating the effects of turbine inlet pressure on the performances of heat exchangers in AWR and AWRR systems. Temperature distributions of fluid streams in the heat exchanging devices are closely examined at different levels of turbine inlet pressure under the conditions that the minimum temperature difference of hot and cold streams reaches the prescribed pinch point. Results show that the position of pinch point and temperature distributions are sensitively affected by varying turbine inlet pressure, which might be the most important design consideration in the power systems using a binary working fluid.
Producing Power Using Stirling Engines by Tapping Heat from the Condenser of Power Plants
Authors: Sharma Nitin , Goel Aman , Ghosh Avishek , Kohli Abhimanyu
Published: November 2012

Mankind’s lax approach towards energy sources during its past years of incessant growth has led to chopping of fossil fuels and done immense harm to the environment. Today we are faced with a challenge to develop eco friendly systems that ensure sustainable development with minimum harm to our fragile surroundings We propose a system consisting a Stirling engine that, using the temperature difference between the condenser inlets and outlets of a power plant (nuclear or thermal), produces power. This will sooth our problems to some extent. In this paper, we will briefly discuss the working of thermal/nuclear power plants in combination with Stirling engine in order to increase the efficiency of conventional power plant systems up to the order of 80% . Above all our system causes lower emissions when compared to the already existing systems since the engine producing power has zero emission. The main advantage of our proposed system is that there will be increase in power production of the existing plants without any further increase in the energy supply. This small auxiliary system working in synchronization with the main system increases the overall efficiency of the plant by increasing the power output without additional energy being expended and also reduces the load on the power plants during peak load requirements.
Vacuum Circuit Breaker Fault Diagnosis System
Authors: Zheng Yu Huang
Published: November 2012

Vacuum circuit breaker becomes more and more complicated, integrated, high-speed and intellectualized. To insure vacuum circuit breaker in its good conditions, the function of fault diagnosis gets more important than before in the process of repairing. This paper designed and developed a network fault diagnosis system based on PROFINET and B/S (Browser/Server) frame through the analysis of the need of fault diagnosis. Taking good use of testing information and diagnosis rules, the system realized open and distributed diagnosing process, and provided a flat of sharing information, which is the technique basis of combining testing and diagnosing. During design, we use Kingview as developing software. It is proved in LAN that the system can utilize present diagnosis rules in database to diagnose fault distributed.
Simulation of the Diameters, Length and Content Effect on the Magnetic Properties of Glass-Coated Magnetic Alloy Microwires
Authors: Sun Ze Yi , Di Yong Jiang , Zhong Zhi Qiang
Published: November 2012

The microwave permeability of glass-coated magnetic alloy microwires / dielectric composite was investigated by apparent permeability linked with intrinsic permeability calculated based on Landau-Lifshitz function. The effect of diameter, length and microwires content on the composite effective permeability was simulated. The simulated results show that the complex permeability decreases with the increase of the microwires diameter and the wire content in the composite. The microwave magnetic resonance frequency increase distinctly with the lengthening of the glass-coated microwires. The full width at half maximum of the ferromagnetic resonance peak increases with the lengthening of the microwires and the decrease of the wire content.
Texture Defect Detection Using Gabor Filters
Authors: Li Peng Fei , Zhang Huan Huan , Kang Xue Juan , Jing Jun Feng
Published: November 2012

This paper aims at investigating a method for tackling the problem of automated fabric defect detection. A new scheme for defect detection using Gabor filters was proposed. In the experiment, texture features is extracted using Gabor filters. The proposed method would automatically segment defects from the regular texture. The experimental results showed the effectiveness of the proposed detection scheme.
Test Model Designed for Tire Pressure Monitoring Control System
Authors: Xing En Hui , Li Jun , Wang Rui
Published: November 2012

In order to monitor tire pressure changes all the time, prevention of blowout and other causes of traffic accidents. By using of Single chip microcomputer(MCU) multitasking technology design of control system for the indirect tire pressure monitoring model. Through the photoelectric sensors to collect four groups tire speed information and develop a series of algorithms and determination method to judge the working state of the tires. It realizes the abnormal tire pressure alarm, and has made up the traditional indirect tire pressure monitoring method insufficiency. Draw the following conclusion: Through use of MCU multitasking technology, taking the radius of the changes caused by the tires pressure changes before blowout for comparison and analysis, getting several situations of tire burst judging method, and producing instruction and alarm that plays the purpose of real-time monitoring of tire blowout to prevent the sudden traffic accidents.
Full-Isolation Load Equivalent and Parameter Measurement Instrument Development
Authors: Yang Jiang , Liu Jun , He Zhou Chan
Published: November 2012

The measurement instrument of Full-Isolation load equivalent and parameter measurement is developed. The composing framework and operating principle are presented. The implement techniques of full-isolation test access are introduced. The load equivalent and parameter measurement instrument is made up general portable computer and test box, which accomplishes the functions of load equivalent, signal test, measurement signal graphical display and the instrument test-self. The isolation test access is consisting of analog signal test access, on-off state test access, 1553B signal test access and Ethernet network data access. By experiment the instrument functions is fulfilled and meet measurement precision.
An Efficient Sleeping Scheduling for Saving Energy Consumption in Wireless Sensor Networks
Authors: Lu Li Peng , Zhai Ming Yue , Liu Ying , Sun Xiao Da
Published: November 2012

Wireless Sensor Networks (WSNs) has been widely recognized as a promising technology in smart grid. However, sensor nodes have limited battery energy. So, we present a mathematical model which is to reduce energy consumption and prolong the lifetime of WSNs. Because of the high density of sensor nodes deployment, a sleep mechanism is proposed to make all sensor nodes work by turns while all service requests can be satisfied. And then, an Improved Sleep Mechanism is put forward to remove redundant active nodes. The simulation result indicates that energy consumption adopting the ISNSS is lower than or equal to the energy consumption adopting SNSS. The SNSS and ISNSS all can save some energy of WSNs to some extent and when the redundant active nodes are removed, the network energy consumption is further reduced based on the SNSS.
Sensor Fault Detection, Diagnosis and Validation - A Survey
Authors: Yao Zhi Gang , Cheng Li , Wang Qing Lin
Published: November 2012

This paper provides an overview and analysis of data-driven sensor fault detection, diagnosis and validation from the application viewpoint. The typical sensor fault detection indices in the literature and the fundamental issues of necessary and sufficient conditions for detectability, reconstructability, identifiability and isolatability are analyzed. The main objective is to study the essential and important algorithms and techniques for single or multiple sensor fault diagnosis and validation. The issues of optimal principal components, sensor validity index, maximized sensitivity, as well as robust sensor fault diagnosis, etc. are discussed. Additional focuses are summarized at the end of the paper for future investigation.
A Research of the Positioning System for Rail Transit Based on Wireless Sensor Networks
Authors: Hu Lan Xin , Wang Xiao Xiao , Bian Xing Bao
Published: November 2012

The paper provides a method to establish a system for monitoring the arrival time of trains or subway trains, and their real-time positions and speeds during runtime. The system consists of wireless sensor nodes along the tracks and in the gateways at stations, which are connected to a central control room. The monitoring principle is the following: (1) when a train or subway train is entering the detection area, the related nodes will work and monitor data including the real-time positions and speeds; (2) when all data are obtained, the nodes will process the data and transfer the data to the gateways; (3) the gateways will further process the data and transfer the data to the central control room. Then, the central control room will provide the information of the arrival time, real-time positions and speeds of trains or subway trains to each station. Apparently, this system and method will provide a base for the safely automatic operation of trains or subway trains.
Noninvasive Alcohol Detection Using Near-Infrared Spectroscopy Based on Partial Least Squares and Monte-Carlo
Authors: Luo Si Te , Chen Guo Qiang , Cui Ruo Fei , Zhou Wei Wei , Lu Li Qian , Li Zeng Yong
Published: November 2012

The objective of this study was to assess the feasibility of noninvasive alcohol testing in vivo with near-infrared (NIR) spectroscopy. The suitable distance between light source and detector was determined by Monte-Carlo simulation. The NIR spectra signals of alcohol in vitro and in vivo were measured, and the blood alcohol concentration (BAC) was measured with breath test method. Wavelet de-noising and partial least squares (PLS) method were used to establish the quantitative calibration model of alcohol. The results indicate that alcohol spectra had two absorption peaks at range of 2200nm～2400nm. The optimal principal component number of PLS model is 3, RMSEP=9.29, MREP=3.5%，R=0.9802. The model has good prediction accuracy. NIRS might provide a new method to the measurement of alcohol in vivo.
Design on the Remote Heating Furnace Monitoring System Based on ZigBee Technology
Authors: Chen Zai Ping , Miao Jia Sen
Published: November 2012

For the hysteretic problems of using offline monitoring in traditional petrochemical corporations heating furnace, a design of realizing multimode heating furnace combustion state online monitoring system based on ZigBee technology is proposed. The system send the collected flue gas data to the PLC by the online flue gas analyzer, and send the flue gas data to configuration interface in the computer of control room for monitoring by the wireless network. The results of application show that the system is steady and reliable, and the data transmission is right and very stable and accord with the requirement desired.
Fault Diagnosis for Level Control System Based on IDEF
Authors: Zhou Kun Lin , Guo Rong Sheng
Published: November 2012

In order to improve the dynamic stability of level control system in the steam drum of boiler, a fault diagnosis approach is proposed by using IDEF method, which can analyze the control system structure by the IDEF model. When the faults occur, the possible causes of fault can quickly be identified by using the model. The approach can provide a reliable basis of decision-making for the control and make a reasonable fault diagnosis in a timely and accurate manner. Using the method can effectively improve the speed of fault diagnosis, prevent the fault occurs, ensure safety and stable operation for the boiler control system.
Precipitation Characteristics of Scaling on Copper and Brass from 0.5mmol/l CaCO3 Solution at 60°C
Authors: Sheng Jian , Zhang Hua
Published: November 2012

Brass and cooper are widely used in heat pump water heater as heat exchanger between refrigerant and water, and the scaling is seriously at 60°C. Study the precipitation characteristics of CaCO3 is the first step to research anti-fouling technology. CaCO3 precipitated on brass and copper coupons from 0.5mmol/l CaCO3 solution by static reaction at 60°C. By weighing the coupons before and after experiments to get the mass of scaling and use Scanning Electron Microscope (SEM) to get the morphology. The results show that at the same condition there is more scaling on copper than brass; high pH not only makes more new crystal nuclei but also promotes square aragonite and calcite and square aragonite gradually recrystallizes to calcite; high pH makes both homogeneous and heterogeneous nucleation rate increasing, but the former increases more, so the scaling mass is bigger at low pH than high pH; under high temperature and supersaturation degree, very small and many crystals are the main substances covered metal surface and not big when scaling layer has been formed, but part of small crystals grow big and all three polymorphs existed but size and proportion were effect by temperature, concentration, pH and so on.
Defect Detection of Metal Injection Modeling by Micro Computed Tomography
Authors: Huang Wei Yun , Chen Chang Da , Chen Yen Nien , Shih Wei Jen , Chang Chih Han
Published: November 2012

Metal injection molding (MIM) is a combination of metal powder and injection molding technology. The main advantage of this technology for material parts with small and complex shape is to manufacture cost-effective and high-volume products. The main processing steps include mixing, injection molding, debinding , sintering, and hot isostatic pressing (HIP) in order to reduce internal porosity of metals, then to improve mechanical properties. This study is based on non-destructive testing method to determine the possible defect inside the internal structure of the MIM parts. Three types of parts with and without HIP were evaluated investigated in this study. The micro computed tomography (Micro-CT) is used to scan these parts. Based the reconstructed section images from CT, the defects can be identified. It showed that with HIP the much of detects could be reduced. To conclude, Micro CT could be used to detect, in a non-destructive way, the internal detect within MIM parts can be found out in the micro-CT images, so that the manufacturing process could be modified to improve the quality of MIM parts.
Tracking Using an Inertial Measurement Unit (IMU) and GPS
Authors: Magboub Hussein M. , Msallem Mohamed A. , Ali Nasser
Published: November 2012

Since the last decade, vehicle tracking has been attracting significant attention in a wide range of applications. To deliver on their requirements, these applications need a specific tracking accuracy. However, current tracking techniques lack the required accuracy, especially for mission critical applications. Although these techniques have demonstrated significant performance improvement, there remain situations that give rise to degraded tracking accuracy, a deficiency that many applications cannot tolerate. This has motivated the research and development of advanced tracking. In this paper will be the design and implementation of an inertial navigation system (INS) using an inertial measurement unit (IMU) and GPS by Matlab simulation software. The INS is capable of providing continuous estimates of a vehicle’s position and orientation. And Comparative study of different types of estimation filters (KF, EKF) which has high accuracy is used to improve system state estimation.
Dynamic Monitoring in Ad Hoc Network
Authors: Shohreh Honarbakhsh , Mazdak Zamani , Roza Honarbakhsh
Published: November 2012

This paper, present a novel model to resolve the problems of evaluating trust value of nodes, and prepare a dynamic supervising in ad hoc network as well. Trust evaluation is not only based on direct interactions among nodes, but also observing previous behaviors of nodes, which come from all interactions through the network. This model specially decreases the delay time of selecting a new head for each cluster, which leads to prepare a dynamic monitoring in intra cluster and inter cluster in ad hoc network.
Flexible Colorization for Greyscale Videos
Authors: Kao Yang Ta , Lin Hwei Jen , Chiang Chiang Ming
Published: November 2012

A flexible video colorization system is proposed that propagates color from one frame to its adjacent frames based on acquiring color from neighboring pixels, color interpolation, connected component analysis, and post processing to accomplish the work of video colorization. Users can obtain a preliminary result by setting some proper thresholds, and then get a finer result in the post processing stage. The experimental results show that our approach can provide satisfactory colorization results.
Readout Integrated Circuits with Pixel-Level ADC for Ultraviolet FPA Applications
Authors: Xu Bin , Yuan Yong Gang , Ma Ding , Cai Neng Bin , Li Xiang Yang
Published: November 2012

An array of 128×128 digital pixel sensors (DPS) that performs both in pixel light current integration and analog-to-digital conversion is presented. The pixel fabricated on a DP4M CMOS process provides a digital output of ultraviolet light intensity via an integrated multiple-channel bit-serial (MCBS) ADC. Due to low light current (~pA) of ultraviolet focal-plane-array, the architecture of capacitive trans-impedance amplifier (CTIA) is used. The proposed readout integrated circuits have a 12-bit resolution, 70dB dynamic range and 99% of linearity.
A Novel High-Pass Filters Implementation by Fully Differential Op Amp Integrators
Authors: Zhang Hai Dan , Bao Hu , Chen Den Gan , Yu Jing
Published: November 2012

The design of low-pass and bandpass filters is often based on the leapfrog method which, in these cases, yields integrator-based structures. Using the leapfrog signal flow graph (SFG) for the simulation of high-pass filters leads to a differentiator-based structure which could be implemented by Gm-C or CCII conveniently. However, when we use Op amp RC integrators for good linearity, we have to use integrators, and not differentiators, for reasons related to the excessive noise behavior of the latter. This paper presents a new leapfrog SFG implementation by fully differential Op amp integrators, which combines good high-frequency properties with good noise properties. The direct SFG simulation method and single-ended output Op amp can also based on integrators, but all of them will lead to a relatively high circuit complexity and a high noise level. A design example is included, with comparisons of gain responses and noise densities.
Effect of Corrosion Inhibitor TG201 on Electrochemical Corrosion Behavior of Tubular Steel HP13Cr
Authors: Yin Cheng Xian , Zhang Juantao , Bai Zhen Quan , Wei Bin
Published: November 2012

This paper studies effect of corrosion inhibitor TG201 on electrochemical corrosion behavior of tubular steel HP13Cr by polarization curve test and exchange impedance spectrum method. It analyzes corrosion morphology by SEM. The results show that the increase of compression stress on HP13Cr lead to its self-corrosion potential shifting negatively, then electrochemical corrosion rate increases. Finally, corrosion resistance performance of HP13Cr steel weakens in acidification environment. Effects of compression stress on electrochemical corrosion become weak by adding TG201 inhibitors. And inhibitor efficiency of TG201 has obvious increase. So controlling compression stress has certain influence on inhibitors efficiency.
A High-Bit-Rate (64/67) DC-Balance Line Code Scheme Based on Guided Scrambling
Authors: Yang Xue , Xiong Jian Ping , Ma Cheng , Jia Hui Bo
Published: November 2012

Guided scrambling is an example of multimode coding technique, which belongs to line code. This technique uses scrambling polynomials to form selection sets, by using proper selection criteria, the codeword with least contribution to DC (direct current) content will be chosen for transmitting. This paper designs this kind of GS (guided scrambling) line code which is suitable to be transmitted in long-distance UTP channel. According to the requirement of the real channel, this technique optimizes the design parameters, such as augmenting bits, scrambling polynomials, bit rate and selection criteria, to achieve the high bit rate of 64/67. The simulation experiment shows that this scheme is efficient in suppression of low frequency, and its PSD characteristics meet the requirement of transmission in long-distance UTP channel.
Analysis of the Impact of Plasma Sheath on GPS Antenna
Authors: Liu Jiang Fan , Wan Guo Bin , Zhang Jin Sheng , Xi Xiao Li
Published: November 2012

The electromagnetic simulation software CST was used to analyze the effects of reentry plasma sheath on the GPS navigation antenna. The Impedance and radiation characteristics of antenna were studied on condition that the antenna was coated with uniform and nonuniform electron density distribution plasma sheath respectively. The results show that, the antenna coated with the uniform plasma sheath, the plasma electron density increasing, the antenna operating frequency moves to high-frequency and that the directivity decreases as well; when the antenna was coated with nonuniform plasma, with the higher electron peak density of plasma sheath, besides that the operating frequency also moves to high-frequency, the bandwidth stretches wide and the return loss reduces; the antenna radiation pattern distorts seriously at the electron peak density of 1018m-3.
Design of Quantum Dot Based LASER with Ultra-Low Threshold Current Density
Authors: Humayun M.A. , Rashid M.A. , Malek F.A. , Hussain Ali , Daut I.
Published: November 2012

Reduction in threshold current density is the major challenge in the field of semiconductor laser design. The threshold current density can be minimized by introducing low dimensional material system with narrow band gap. InN has a narrow band gap of 0.7 eV and quantum dot provides three dimensional confinement factor. In this paper, we propose then InN quantum dot as the active layer material that will serve both the purpose of narrow band gap and three dimensional confinement. The simulation results show that the current density reduces drastically with the cavity length.
The Research of Quantitative Analysis Methods on Product Form Information Based on the Cross-Section Diagram Set
Authors: Tang Zhi , Cai Meng Ya , Wang Sheng Ze , Sun Bo , Hao Yue Ming
Published: November 2012

The external morphological characteristics of the handle grip impacts the man-machine interaction especially that of with fingers. Hence, the research on the external morphological of existed products has important significance on the improvement of man-machine interaction when designing a product. Most of the traditional ways of obtaining or describing product form information are established on a variety of views which do not consist the quality of data analysing dynamically or quantitatively. The aim of this article is exploring a new method based on the cross-section diagram set of the product. The method works in a more accurate way in obtaining the diagram information of product, meanwhile, it describes the change state of products' external characteristics by the simplex dimension of information. The method allows a dynamic and quantized way analysing the external characteristics of the product.
The Simulation Research on Ultrasound Signal Propagation Model for Oil and Gas Pipeline Corrosion
Authors: Shen Bin , Zhang Zhen Yun , Li Qiong Wei , Li Ming Xing , Yang Bin
Published: November 2012

The elastic stress field theory is used to research the quantitative relation model between ultrasonic pulse-echo and layer structure when ultrasonic wave is vertical-incidence transmission, and numerical simulation has demonstrated the models are available.
Optimal Transformation in Fruit Scans Registration
Authors: Yang Hui Jun , He Dong Jian , He Peng
Published: November 2012

Transformation used for aligning feature-based scans pair, is pivotal in optimization and simplification for splat-based scans. In this paper, a novel optimal transformation algorithm is first presented by take advantage of transformation between two coordinate system which is directly determined by position and normal. And then transformation is simplified by eliminating the redundant transformation to remit the computation complexity. At last, we give the transformation result of apple scans registration in our experiment platform and verify the accuracy and performance in fast computation of algorithm.
Research on Localization of Vehicle Backwindow for Binocular Distance Measurement
Authors: Hou A Lin , Jin Zhi Juan , Chen Juan , Liao Qing , Geng Ying
Published: November 2012

The scene distance information is obtained by disparity based on binocular stereo vision. It is widely used in scientific research and practical engineering. Two cameras which fixed on ahead of the vehicle are used to capture stereo image pairs. Then the backwindows of the two images are located using Hough transform. The top left corner of the windows can be treated as a pair of matching points to calculate the distance of the front vehicle according to the principle of binocular stereo vision. The distance measurement scheme is presented. The experimental results demonstrated that the algorithm provides accurate localization and can help driver to deal with traffic problem to some extent.
Representing the Object, Process and Designer in Designing
Authors: Hou Yue Min , Ji Lin Hong
Published: November 2012

The goal of the presented work is to establish foundation for design systems combining both human intelligence and computing power of computers for real engineering design. The lack of involving designers in current design models impairs the design flexibility of computer-based design systems. This paper investigates design process with a developmental and dynamic view and develops a designer dominating designing (DDD) framework involving the object, process and designer. The design framework consists of six stages, three types of transfer functions, measurement functions, and evaluation functions, and it is represented as a dynamic system. A bio-inspired design framework (six-stages) is used to present the design process into six phase states and three mechanisms. An integrated product engineering model (iPeM) is used to generalize various design activities into transfer functions and measurement functions. Examples are presented to validate the method.
Research of Error Compensation Based on DR/GIS Integrated Navigation
Authors: Xu Jian Guo , Zhang Zhi Li , Zhou Zhao Fa , Li Zhong Xin
Published: November 2012

Dead Reckoning is an autonomous navigation method less susceptible to external environment, but due to the initial alignment declination and odometer coefficient error, navigation errors increase with time. In this paper, the map matching algorithm is used to precisely match the dead reckoning to compensate the vehicles heading deviation angle and odometer coefficient error by positioning error. Studies have shown that the odometer coefficient error and dynamic alignment accuracy are mainly affected by the vehicles displacement between two points and positioning accuracy. Error feedback iterative method is used to compensate for correction, which can better inhibit the gyro drift on navigation deviations impact. The simulation results show that considering the map matching algorithm accuracy under the premise of this program, the odometer coefficient error is significantly lower and the accuracy of alignment can reach minute level after five iterative calculations.
Life Cycle Assessment of Mechanical and Physical Method Used in Recycling Process of Waste Thermosetting Phenolic Laminated Plastic Based on GaBi Software
Authors: Liu Zhi Feng , Pan Shao Bo , Wu Zhong Wei , Zhan Yi Fei
Published: November 2012

Based on software GaBi4.3, life cycle assessment method is used to analyze the abiotic depletion, energy consumption and environmental emissions of recycling process of 1kg waste thermosetting phenolic laminated plastic. This paper also takes advantage of CML2001 provided by GaBi to assess the environmental impacts through the recycling process. The result shows that the rank of environmental impact is: Regeneration> Molding > Crush; the main environmental impacts are global warming potential, acidification potential and eutrophication potential.
Aerodynamic Characteristics Numerical Simulation of the Protective Device of Ejection Seat
Authors: Tian Jia Lin , Chen Lei
Published: November 2012

In order to investigate the windblast protective devices’ effects on the aerodynamic characteristics of human-seat system, two geometric modes were built, one was installed protective devices, the other was not. Used the FLUENT, a CFD software, a series of simulation experiments were done. The two models’ contours of pressure and curves of aerodynamic force parameter were obtained. Besides the rule of how the protective devices effect on human-seat system was obtained. These results had some referenced worthiness for designing protective devices.
Reconstruction and Electronic Properties of Interface between Carbon Nanotubes and Ferromagnetic Co Electrodes
Authors: Cuong Nguyen Tien , Mohamed Mohd Ambri , Otsuka Nobuo , Chi Dam Hieu
Published: November 2012

The reconstruction and electronic structures of the interfaces between single wall carbon nanotubes and ferromagnetic Co electrodes were studied in the framework of density functional theory. The obtained results revealed that there is a strong interaction between carbon nanotubes and Co electrodes. At the interface region, Top layers of Co surface have been significantly reconstructed. The nature of chemical bonds at the Co-C interface is covalent bonding. The increase of the electron density occurs mainly at the interface where a substantial concentration of electron accumulates in Co-C bonds. A small amount of charge transfer from Co electrode to carbon nanotube junction was found. In addition, the spin polarization of Co atoms at the interface region has been suppressed due to the interaction with a carbon nanotube. It implies that the spin transport through this layer is low, which results in the small hysteretic magneto-resistance of carbon nanotube devices.
Priority Weighted Fitness Model in Networks
Authors: Chen Xin Yi
Published: November 2012

Systems as diverse as genetic networks or the World Wide Web are best described as networks with complex topology. A common property of many large networks is that the vertex connectivities follow a power-law distribution. This feature was found to be a consequence of three generic mechanisms: (i) networks expand continuously by the addition of new vertices, (ii) new vertex with priority selected different edges of weighted selected that connected to different vertices in the system, and (iii) by the fitness probability that a new vertices attach preferentially to sites that are already well connected. A model based on these ingredients reproduces the observed stationary scale-free distributions, which indicates that the development of large networks is governed by robust self-organizing phenomena. Experiment results show that the model is more close to the actual Internet network.
Modeling Method Based on Subspace Identification for Lime Kiln Calcination Process
Authors: Zhang Li , Gao Bo , Bao Zeng Jun
Published: November 2012

To deal with the modeling problem of the lime kiln calcination process, we propose a model describing the relationship between process states and outputs. By analyzing the strongly coupled features in the process, we construct a relationship model using subspace identification method which takes two inputs including the second air flow and gas flow, and two outputs including the calcining zone temperature and kiln tail temperature. The simulation shows that this model is of high accuracy for describing the characteristics of lime kiln calcination process.
Development of Automobile Simulative Teaching System Based on the ZigBee Technology
Authors: Zhang Ji Wei , Si Chao Liang , Wu Xiao Ming
Published: November 2012

Having fast and precise automobile fault check is a basic skill for automobile maintenance technicians. The simulation and setting of fault in automobile simulative teaching system need to be fast and accurate. The automobile simulative teaching system, based on ZigBee technology and usage of wireless sensor networks, is built to set fault for several EFI car engine training tables. It facilitates the students’ exercise and examination. The system uses the CC2430 chip to achieve the network node hardware and software design, information collection and wireless transmission. The practical application shows that the system has a simple structure, high reliability, broad application prospects.
Mathematical Modeling and Experimental Research on Scroll Expander
Authors: Yang Xing Hua , Wang Ji Dai , Pan Jia Zhen , Liang Xin Jun
Published: November 2012

A scroll expander is applied to a compressed air energy storage system in order to improve the energy conversion efficiency. Based on the geometric model, mass conservation equation, ideal gas equation and energy conservation equation, a mathematical model of the scroll expander is developed in order to describe the variation mechanism of the volume, mass, pressure and temperature of the air in different chambers. A prototype is constructed and tested to verify the simulation model. The mathematical model is implemented in Matlab and verified by comparing the simulation with the experimental results. The simulation agrees well with the experimental results.
QoS Routing Algorithm Using Competitive PCNN
Authors: Zhou Dong Ming , Cai Hong
Published: November 2012

The solution of the multi-constrained QoS routing is translated into a shortest path problem for a weighted graph, and the problem of multi-constrained QoS routing is successfully solved using the properties of pulse wave parallel propagation of the competitive PCNN. The number of iteration of our algorithm is dependent of the length of the globally optimal multi-constrained QoS routing between source node and destination node and independent of the number of nodes and edges and the complexity of network distribution structure. The method shows better computational performance and dominance and has important significance in both theory and applications.
Tuning Color of Charged Iridium (III) Complexes with a Spiro N,N'-Bidentate Ligand
Authors: Mothajit Kattaliya , Wongkhan Kittiya , Jitchati Rukkiat
Published: November 2012

Organic light emitting diodes (OLEDs), charged iridium(III) complexes, spiro ligand Abstract. We report the synthesis, characterization and photophysical properties of a cationic cyclometalated Ir(III) complexes of general formula [Ir(ppy)2(spbpy)]+Cl, [Ir(diFppy)2(spbpy)]+Cl and [Ir(thiopy)2(spbpy)]+Cl where ppy, spbpy, diFppy and thiopy are 2-phenylpyridine, 4,5-diaza-9,9′-spirobifluorene, 2-(2′,4′-difluorophenyl)-pyridine and 2-(thiophen-2′-yl)-pyridine, respectively. The complexes exhibit strong absorption bands in the UV region in solution spectra, due to spin-allowed ligand-centred (LC) and weaker absorption bands at longer wavelengths from metal-to-ligand charge transfer (MLCT). The photoluminescence spectra of all the complexes were characterised by a combination of 3MLCT and 3π→π* states. The emission color of a cationic cyclometalated Ir(III) complexes in solution have successfully tuned from green to orange (501-582 nm).