bluuebunny/crossref_metadata_2025 huggingface dataset:
A MULTIOBJECTIVE MODEL FOR PASSIVE PORTFOLIO MANAGEMENT: AN APPLICATION ON THE S&P 100 INDEX
Authors: García Fernando , Guijarro Francisco , Moya Ismael
Published: September 2013

Index tracking seeks to minimize the unsystematic risk component by imitating the movements of a reference index. Partial index tracking only considers a subset of the stocks in the index, enabling a substantial cost reduction in comparison with full tracking. Nevertheless, when heterogeneous investment profiles are to be satisfied, traditional index tracking techniques may need different stocks to build the different portfolios. The aim of this paper is to propose a methodology that enables a fund's manager to satisfy different clients’ investment profiles but using in all cases the same subset of stocks, and considering not only one particular criterion but a compromise between several criteria. For this purpose we use a mathematical programming model that considers the tracking error variance, the excess return and the variance of the portfolio plus the curvature of the tracking frontier. The curvature is not defined for a particular portfolio, but for all the portfolios in the tracking frontier. This way funds’ managers can offer their clients a wide range of risk-return combinations just picking the appropriate portfolio in the frontier, all of these portfolios sharing the same shares but with different weights. An example of our proposal is applied on the S&P 100.
FIRM SIZE, TECHNOLOGICAL CAPABILITY, EXPORTS AND ECONOMIC PERFORMANCE: THE CASE OF ELECTRONICS INDUSTRY IN MALAYSIA
Authors: Chandran V. G. R. , Rasiah Rajah
Published: September 2013

This paper examines the joint effects of technology and exports on the economic performances of electronics firms in Malaysia. The empirical results based on the Partial Least Square (PLS) estimate procedure show that technological capability plays a multiple role in that it influences both the exports and performance of a firm simultaneously. More importantly, we find evidence that exports act as a mediating variable between technological capability and firm performance. Size is found to influence all three: product capabilities, exports and firm performance but not process capabilities. This paper concludes that researchers, in future studies, need to examine the dynamism between size, technology, exports and performance.
DETERMINANTS OF FOREIGN INVESTMENTS IN RESIDENTIAL PROPERTIES: EVIDENCE FROM MALAYSIAN STATES
Authors: Gholipour Hassan Fereidouni
Published: September 2013

The last decade has witnessed a strong growth in foreign investments in residential properties (FIRP) in Malaysia. However, FIRP is not equally distributed among Malaysian states. Hence, this warrants an investigation into why some states have larger FIRP than others. The purpose of this paper is to investigate the pattern and determinants of FIRP in Malaysian states. FIRP in Malaysia has been agglomerated in the major and industrialized states (such as Kuala Lumpur, Selangor, Pulau Pinang and Johor). Using a panel of 14 Malaysian states over a period of 7 years (2004–2010) and applying the system Generalized Method of Moments (GMM) approach, the statistical results show that tourism agglomeration (learning about the host location), well-being of the local people, foreign investments in other sectors, religious diversity and minimum property purchase price are important determinants of FIRP.
The Research and Implementation of SM2 Algorithm on COS
Authors: Xiao Juan , Wu Juan
Published: September 2013

To improve the security and reliability of Chip Operating System,A Chip Operating System supporting SM2 algorithm is designed and implemented on smart card chip of Tongfang THD86.The system shows better performance and efficiency on security. The experimental results and the security analysis showed SM2 algorithm had advantages of taking up less memory space and higher efficient on encryption and signature than RSA algorithm.The COS passed the tests of State Cryptography Administration, it was valuable and effective.
Autonomous under Water Vehicle
Authors: Ali Zain Anwar , Nasim Shahzad , Liaquat Faraz , Wasi Sarwar , Shafiq M.
Published: September 2013

In this research a feedback based under water system is introduced that can perform underwater task without human efforts. The system is named as Remotely Operated Under water Vehicle (ROV) & autonomous underwater vehicle (AUV). ROV can also provide a feedback to the base station about its current status such as its depth, direction, velocity, mine detection and targeting. The complete analysis has been implemented and by using MATLAB and AVR studio 4.
A Sensor Network Routing Protocol Based on Node Residual Energy
Authors: Ni Ming , Qian Kai Guo , Xie Yong Gang , Dai Zu Cheng
Published: September 2013

This paper mainly discusses the problem of wireless sensor network routing protocols. The flooding routing protocol has disadvantages of hidden terminal, information implosion and emerging redundant packet copies which consume more node energy. A sensor network routing protocol based on node residual energy (RPBEN) is proposed and evaluated. The new protocol choices a small number of nodes that have maximum remaining energy as next hop routing nodes. It saves the energy by avoiding redundancy packet copies produced and improve the disadvantages of flooding routing protocol. Performance analysis and simulation experiment show that the new protocol effectively reduces the data redundancy, reduces the energy consumption and prolongs the network lifetime.
Analysis of Source Power Distribution in Electromagnetic Loop Network by Circuit Theory
Authors: Wang Xin Tao , Qu Zhi Jiang , Qin Jian Hua
Published: September 2013

The hazards of electromagnetic loop network in the power grid are briefly introduced. It pointed out that the quantitative analysis of source power distribution is useful to develop effective scheduling operation. In this paper, according to circuit theory, distribution of source power is analyzed in the electromagnetic loop network, and the power transfer functions from the sources to the loads are established, which reveals the power transfer rule. This method could not only help the schedulers deepen the understanding of the inherent laws of power flow changes, but also support to develop effective scheduling measures. Finally, a simple system is used to test this method.
A Real-Time Web Application Solution Based on Node.js and WebSocket
Authors: Zhao Shu Man , Xia Xiao Ling , Le Jia Jin
Published: September 2013

With the rapid development of computer technology, the demand for real-time information is becoming higher, many real-time web applications such as online booking system, stock trading system, instant messaging system, are supposed to send the constant changes of the server to the client in real time. On the basis of in-depth study of WebSocket protocol in HTML5 standard, this paper proposes a new real-time web application solution based on Node.js and WebSocket, aiming to significantly enhancing real-time performance, and more efficiently using the processing power of the server. Finally, the new solution is applied in the game You draw, I guess to theoretically and practically study the viability of the solution and the advantages compared to traditional solutions.
Design and Implementation of an Intelligent Video Surveillance System Based on Android Phone
Authors: Zhang Yu Xin , Li Fu Quan , Tao Xi , Lin Guo Yu
Published: September 2013

This paper proposes a new intelligent video surveillance system based on Android phone. By using Android phone, this system can be deployed easily and quickly. Compare with the traditional surveillance system, this new one uses Android phone to replace the large and expensive surveillance cameras. In addition, the functions of back-end equipment of the traditional system have been moved to the front-end equipment. With a modified invasion detection algorithm, the front-end equipment becomes more intelligent. This schema can significantly increase the mobility and flexibility of the entire system. Therefore this system will have a better performance dealing with emergencies in different surveillance scenarios. Moreover, this state-of-art intelligent video surveillance system not only brings a new method for surveillance, but also advances the development of surveillance techniques.
Prediction of Updated Cutting Parameters for a Spindle Subjected to Bearing Wear: A Free Vibration-Based Approach
Authors: Gaber Omar , Hashemi Seyed M.
Published: September 2013

The effects of spindles vibrational behavior on the stability lobes and the chatter behavior of machine tools are discussed. Multi-segment spinning spindle models, developed based on the Euler-Bernoulli beam bending theory, have revealed that the system exhibits coupled Bending-Bending (B-B) vibration and its natural frequencies are found to decrease with increasing spinning speed. It has also been observed from the experimental data that an average spindle goes through three stages of operation, namely settling, normal operation and failure. As spindle fundamental frequency changes, the stability lobes change, i.e., the originally selected cutting parameters could lead to chatter. It is shown that using the experimental results, it is possible to establish an expression for the variation of spindle's fundamental frequency in terms of machine hours, which can in turn be used to predict chatter-free cutting parameters through calibrated models and the stability lobes.
An Overview of Change Management within Manufacturing Environment
Authors: Hasan Syed M. , Shah Satya
Published: September 2013

In this competitive world, where features like time to market, new technology and change management are the features that can affect the performance of New Product Development (NPD). Companies tend to use a conventional approach to NPD by assigning representatives from support functions to review and recommend changes as projects evolve. This approach has, in recent years, been questioned since it is a costly and time-consuming approach due to its iterative nature. It is argued that the change management process can reduced the negative effect and has the ability to support the functions of a supply chain to a greater extent and also earlier in the NPD process. This paper focuses on different change management techniques to support the required changes by management to integrate the NPD within supply chain (SC).
Power Supply System Based on Photovoltaic Solar Panels and Current Transformers
Authors: Tang Wei , Wu Jian Wen , Xin Chao
Published: September 2013

Aimed at the low voltage power supply of the intelligent terminal equipment controller in 10kV Distribution Power Grid, a new power supply system, which consists of 24V Lead-acid battery charged by photovoltaic (PV) solar panels and current transformers (CT), is researched in this paper. To maximize the charging power, three points Perturb and Observe algorithm with alterable perturbation step is applied. In the CT charging module, a hysteresis comparator and a discharge circuit are properly utilized to stabilize the charging voltage. At the end of this paper, the power supply system is experimentally validated, and can provide 17.45W charging power to battery with efficiency of 84.26%.
Simulated Welding Heat Affected Zone Toughness and Microstructure Transformation of a Ti-Zr Microalloyed Low Carbon Steel
Authors: Wang Chao , Shi Ming Hao , Zhang Peng Yan , Zhu Fu Xian , Wang Guo Dong
Published: September 2013

Acicular ferrite (AF) can significantly improve the performance of steels and can be promoted through special inclusions. The present experimental steel was a low carbon Ti-Zr deoxidized and microalloyed steel. The welding heat affected zone (HAZ) simulation indicated that under high heat input (100 kJ/cm) and peak temperature (1400°C) conditions, the HAZ exhibited high impact toughness (150 J, -20°C) and desired microstructure. Isothermal heat treatment data suggested that grain boundary ferrite formed at ~600°C and AF formed at ~500°C. Intragranular plates sheaves formed at ~450°C. MnS coherent precipitation on ZrO2TiOx inclusions promoted AF nucleation.
Study of Calcium Acrylate on Compressive Strength and Hydration Process of Cement
Authors: Wang Fu Lan , Wang Qi , Song Peng , Yang Zhong Xi , Tian Lei
Published: September 2013

In this paper, the hydration process and strength of calcium acrylate (CA) modified cement under the effects of different additives, such as, initiator-hydrogen peroxide, accelerator-triethanolamine, and cross-linking agent-butyl acrylate, were studied. Through comprehensive analysis, the optimal content of additives of initiator, cross-linking agent, and accelerator is ascertained 3%, 10% and 3%, respectively. On the condition of optimal content of additives and CA, it can be obtained that CA can increase the exothermic rate of cement within one hour and accelerate the exothermic rate in the induction period, shorten the time of the induction period, and speed up the initial setting time of cement. Besides, CA can inhibit the transformation of AFm from AFt, improve the dispersion of cement paste, make later hydration more fully, and promote later strength.
Fractography of Particle Strengthening Mechanisms at Interfaces in Prepreg Composites
Authors: Joshi Sunil C. , Dikshit Vishwesh , Ali Mubarak
Published: September 2013

This paper discusses the research conducted on prepreg composites interfaces engineered with, either carbon nanotubes (CNTs), or core shell micro-particles (CSMs). The emphasis is given on the fractography details that highlight various mechanisms involved in strengthening the ply-to-ply surface contacts due to the addition of these nanoand micro-particles.
Experimental and Numerical Study on Cooling Process of Sinter
Authors: Guo Lian Lian , Wang Jing Fu , Wang Yin Zhi
Published: September 2013

By means of thermal analysis, specific heat values of sinter with different temperatures are measured and the linear function which along with the change of temperature is got. According to the actual condition, the porous medium model which describes the cooling process is established. The influences on cooling process of specific heat with fixed and variational values are compared. With the variational specific heat, the effects on cooling process of sinter initial temperature and air temperature are discussed. The result shows that both increasing sinter initial temperature and cold air temperature can improve the exhaust heat utilization, but the later delay the cooling time.
Investigation of Composition-Properties’ Relations on Silicon and Carbon Based Nanomaterials
Authors: Vladoiu Rodica , Mandes Aurelia , Contulov Mirela , Dinca Virginia , Porosnicu Corneliu
Published: September 2013

Multicomponent thin films (binary-SiC and ternary-SiCAl) as well as single thin films (silicon Si) were deposited using Thermionic Vacuum Arc (TVA) technology. The thin films were characterized using X-ray diffractometer (XRD, Philips PW1050, Cu K), scanning electron microscope (SEM, Zeiss EVO 50 SEM) accompanied with energy dispersive spectrometer and transmission electron microscope (TEM, Phillips CM 120 ST, 100 kV). The film is composed of nanoparticles very smoothly distributed of 15-30 nanometer size embedded in amorphous matrix film. The results reveal high hardness for SiC (10-40 GPa) and for SiCAl: low wear rate (6.16E-05 mm3/Nm).
Dielectric Properties of CCTO/PVDF Composite Films
Authors: Wang Fang Fang , Wang Ya Jun , Ren Zhi Bo
Published: September 2013

To meet the requirement of microelectronic industry, ceramic/polymer composite films made of CaCu3Ti4O12 (CCTO) powder as filler and PVDF copolymer as matrix were prepared by solution casting method. The dielectric properties (DP) and morphology of the films were studied by impedance analyzer and scanning electron microscope (SEM) respectively. The dielectric constant could reach 23.96 and loss 0.1082 when mass fraction of CCTO is 50% at 100 Hz. SEM results show that CCTO particles dispersed well in the PVDF matrix. At last, three composite models were used to predict the dielectric constant of the composite films and it is proved that Yamada model fits the experimental data well.
Necessary and Sufficient Conditions for Oscillations of a Class of Mixed Partial Difference Equations
Authors: Yuan Chun Hua
Published: September 2013

Various problems of science and engineering that deal with dynamical systems can be described by partial difference equations. This article is concerned with a class of mixed partial difference equations with constant coefficients. We obtain necessary and sufficient conditions for all solutions of these equations to be oscillatory by finding the characteristic roots. An example is given to illustrate the results presented in this paper.
Performance Analysis of Cryogenically Treated HSS Profile Cutter by Experimental and FEA
Authors: Ramji B.R. , Murthy H.N. Narasimha , Deepak B.K.
Published: September 2013

The main objective of the research was to study the effect of cryogenic treatment and double tempering on the tool life of HSS profile cutter in machining EN47 Spring Steel cutting tool components. TiAlN coated HSS profile cutters were cryogenically treated at-175 °C and double tempered at 200 °C. Milling exercises were carried out using un-treated and treated and double tempered tools on EN-47 spring steel reamer components at different machining conditions. The treated HSS profile cutter showed 40 % greater tool life than that of the un-treated in machining EN-47 spring steel components for making flutes. FEA for temperature profile of the cutting tools of the treated and non-treated was performed. Tool tip temperature for untreated and treated were found to be 22 °C and 20 °C respectively.
A Study on a Class of Double-Loop Networked Control System with Differential Sampling Rate and State Feedback
Authors: Liu Dian Ting , Liang Cheng He , Chen Xiao Xiong
Published: September 2013

For a class of double-loop networked control system with differential sampling periods is studied in this paper. Its mathematical model is set up based on time-delay theory, and its stability conditions are obtained based on Lyapunov-Krasovskii functional and free-weighting matrices approach. On this basis, the design method of the controller to stabilize this networked control system with state feedback is explained. Finally, an example of the inverted pendulum is presented to test the validity and effectiveness of the methods proposed in this paper.
Dual Piezoelectric-Driving Pneumatic Digital Valve Control Method Simulation Research
Authors: Xu You Xiong , Zhu Song Qing
Published: September 2013

Because its pilot stage is a two-position tree-way valve, the previously research piezoelectric type pneumatic digital valve also constantly works in on or off state even in the case of output stable pressure, which makes the valve with pressure fluctuation, waste gas and other shortcomings. In order to overcome the above problem, a novel pneumatic digital valve driven by dual piezoelectric is presented in this thesis. And its simulation model is built based on the AMESim and Matlab/simulink joint simulation platform. On this basis, its control method is researched by the simulation. The simulation shows that the Bang-Bang and the PWM control algorithm can basically achieve the digital proportional control of the valve, but the valve has overshoot. For this, the compound control algorithm with PID plus PWM is proposed to control the valve. The simulation results show that this algorithm is effective which can reduce the pressure overshoot.
The Rotor Current Orientation Decoupling Control of Doubly-Fed Motor
Authors: Chen Xian Biao
Published: September 2013

This paper presents a vector control scheme of doubly-fed motor based on stator flux orientation. The scheme achieves decoupled flux and torque component of stator current through directional control of the rotor current vector. It is suitable for both motor sub synchronous operating condition and super synchronous operating condition. Simulation experiment based on the scheme is carried out by Matlab/Simulink and simulating waveforms are given to prove the correctness of the scheme.
Time Effect of Sulfurization on the Characterization of Copper Indium Diselenide
Authors: Kong Ling Jian , Zhu Gui Fang , Zhong Jian Qiang , Han Kui Xia , Wang Xiao Kang
Published: September 2013

Polycrystalline CuIn(Se,S)2 (CISS) thin films with chalcopyrite structure were synthesized by sol-gel spin-coating method. Sequential reduction, selenization and sulfurization treatments were performed with hydrogen, Se and H2S vapor, respectively. The effects of different sulfurization times on the films were also studyed. X-ray diffraction (XRD), and SEM analysis have been employed to examine the structural properties and surface morphology of polycrystalline CISS thin films. The experimental results demonstrated that the obtained CISS had good crystallinity and uniformity.
Active Control of Low Frequency Linear Spectrum by Estimating Receivers Location
Authors: Hu Cheng Jun , Zheng Yuan
Published: September 2013

An approach to actively control the low frequency linear spectrum in vessel navigation noise is proposed. The approach relies on the introduction of a secondary noise-cancellation source which is fixed aboard and whose signal generation uses the estimated location knowledge of the receiver. Loss of underwater acoustic transmission is modeled and Monte Carlo simulations are conducted to analyze the noise-reduction effects under different location estimation errors. Simulation results show that bearing estimation error is the predominant factor affecting the radius of the effective noise-reduction region, while distance estimation error has considerable effect only when the perpendicular distance from the receiver to vessels course is quite small. Besides, when bearing estimation error is less than 1.2° and distance estimation error is less than 80%, satisfactory noise reduction region can be obtained using the approach.
Material Behavior of Porous Media
Authors: Remache Leila , Djermane Nacerddine
Published: September 2013

The drying of porous media is studied in this paper by means of the continuous approach and the control volume method. Both transport phenomena inside the porous medium and overall drying kinetics are analyzed. The model utilized in this study requires a lot of physical properties. All of them have been established experimentally. The capillary pressure, which depends on the moisture content, is obtained by a mercury intrusion curve.
Design of Broadband Planar Spiral Antenna for Partial Discharge in Cable
Authors: Liang Yong Chun , Qiao Zhao Long , Ge Zhi Peng , Feng Teng Jiao
Published: September 2013

The detection of partial discharge in power cables is an effective method to diagnosis early fault of XLPE cable . When partial discharge occurs, it emits abundant frequency component in ultra-high frequency (UHF) band, and broadband planar spiral antenna is an effective sensor to detect UHF partial discharge signals. High frequency electromagnetic simulation software Ansoft HFSS is used to simulate and analysis planar Equiangular spiral antenna and Archimedean spiral antenna. The simulation results show that the two kinds of antennas work effectively in 400 MHZ ~ 1 GHZ frequency band and are high sensitivity and superior performance. Because of with smaller size and larger gain, the Archimedean spiral antenna is used to detect UHF signals of partial discharge in XLPE cable.
Surface Modification of Polypropylene Blood Oxygenator Membrane by Poly Ethylene Glycol Grafting
Authors: Abednejad Atiye Sadat , Amoabediny Ghasem , Ghaee Azadeh
Published: September 2013

Blood oxygenators play key role in Extra Corporeal Membrane Oxygenator (ECMO) system using for patients with acute respiratory problems, immature fetal and also in open heart surgery. Interaction between blood and blood oxygenator polymeric membrane surface lead to fouling phenomena which have negative effect on performance of this important medical device. A modification comprising surface activation, PEG immersing and PEG graft polymerization carried out to provide acceptable blood oxygenator performance, blood compatibility and reduction in heparin consumption at the same time. Modified membranes characterized by FTIR, contact angle measurements and Atomic Force Microscopy (AFM) analyses. Blood compatibility of modified surface was also detected by SEM images. Results clearly indicate that modifying membranes by PEG is an effective way for anti-fouling properties. Water contact angel reduction from 110ْ to 72ْ shows hydrophilicity enhancement, roughness increasing from 15 to 20 and blood compatibility improvement was investigated by SEM and AFM analysis results respectively.
Intelligent Identification of Flow Regime Based on Improved BP and IMFs
Authors: Wang Qiang
Published: September 2013

Aimed at the characteristic of nonlinear and non-stationary of pressure drop, in this article a flow regime identification soft sensing method using Hilbert-Huang transformation combined with improved BP neural network is put forward. The method analyzes the intrinsic mode function (IMFs) obtained after the empirical mode decomposition (EMD), then extracts IMF energy as the characteristic vector of an improved BP neural network with self-adapted learning ratio. Learning form training samples, the network could accomplish the objective identification of the unknown flow regimes. The simulated results showed that the flow regime characteristic vector which was obtained by IMFs could reflect the difference between various flow regimes and the recognition possibility of the network could reached up to about 95 percent. This study provided a new way to identify flow regime by soft sensing.
Fast Maximum Likelihood Localization of Near-Field Sources
Authors: Xue Lin , Zhai Hong Cun
Published: September 2013

Conventional methods for locating near-field sources generally suffer performance degradation when the assumption of uniform spatial Gaussian noise does not hold. In this paper study the scenario of non-uniform spatial Gaussian noise. First we construct the near-field signal model based on planar sensor array and derive the maximum likelihood method for obtaining the azimuth and distance of sound sources, then we proposed two fast algorithms-stepwise-concentrated maximum likelihood method(SML) and approximate maximum likelihood method(AML) to reduce the high computational complexity of maximum likelihood localization method. Simulation results show that the two proposed methods outperform conventional maximum likelihood method, with lower computational complexity and less mean squared error of both azimuth estimation and distance estimation.
Variable Step Pulse Deinterleaving Method
Authors: Liu Guo Qing , Wu Fan , Zhang Yan Hong
Published: September 2013

This paper presents a variable step pulse deinterleaving method. The method can not only realize signal sorting and at the same time frequency high precision estimation of the impulse, and avoids the problem of how to divide the range of pulse repetition interval of interest. Furthermore, the sorting method is not sensitive to the frequency jitter size, can be used for high frequency jitter radar pulse string sorting. Because the search step size increases with the pulse repetition interval, the sorting method also helps to reduce the signal sorting computation.
The System of Real-Time Image Processing and Combustion Diagnosis Based on Omap3530
Authors: Zhang Yu Jie , Wu Ying Ying
Published: September 2013

In this paper, according to the characteristics of power plant boiler combustion process, to use the image processing technology to extract feature quantity of flame combustion. For boiler combustion diagnosis real-time requirements, the system of real-time image processing and combustion diagnosis based on OMAP3530 was designed and developed. The system makes full use of the OMAP3530 dual-core processor, and makes the operating system and control, video signal acquisition, human-computer interaction, output driving tasks run on the ARM, and the image data processing tasks are completed by DSP. It maximizes the performance of OMAP3530, improves the real-time performance of the system. Experiments were carried out in 200MW boiler. The results show that, the system is simple and practical, which can realize the combustion diagnosis of the running boiler and provide the reliable basis for the safety and economic operation of power station boiler. It has a certain engineering application prospect.
Bandit Detection System under Various Noise Levels with Nearest Mean and Gaussian Classifier
Authors: Junoh Ahmad Kadri , Mansor Muhammad Naufal , Ya’acob Alezar Mat , Ismail Siti Haida , Omar Nurhidayah
Published: September 2013

The Government Transformation Programme (GTP) is an effort by Malaysia's current Government to address seven key areas concerning the people of the country. The programme was unveiled on 28 January 2010 by the Malaysian Prime Minister Najib Tun Razak. One of the (GTP) agenda is to reduce the crime rate as per its Vision 2020. Thus, in order fulfill this demand and challenge our enthusiasm to create a better place for our beloved country. We proudly presented a bandit detection system under various noise levels with nearest mean and Gaussian classifier. This system to boost the Malaysian police arm forced performance.
Fault Location for Distribution Networks Based on Node Voltage Equation
Authors: Tang Chao Guo , Dong Feng Xiang , Yuan Zheng , Tan Dan , Zhang Wen Hai
Published: September 2013

Proposed a single end fault location algorithm based on fault distance distribution function to implement fault location for isolated neutral system. Based on bus impedance matrix, establish fault distance distribution function adapted to all kind of asymmetric shorted fault in insulated neutral system. Combine the voltage sag data measured at substation to determine the most possible fault point through data matching and analysis. The method can implement fault location for all kind of asymmetric shorted fault and doesnt need much iterative procedure. Also, it is applicable to complicated systems with multi-branch and is quite robust to load variations. Simulation results for a 10Kv typical distribution network verify the validity of the method.
A New Method of Panoramic Image Mosaic Based on SIFT
Authors: Li Tong , Liu Zhen Hai , Ma Zhi Jun
Published: September 2013

When using the traditional SIFT algorithm extracts feature points, whose characteristics are rotation and scale scaling invariance, the problems are that the feature point extracted by the algorithm is too small and the shortages of real time and robustness. This article proposes a new method called Panoramic Image. This method can define the transformation parameters between the images by using the distances between cities to measure the similarity and using RANSAC with SPRT to diminish the mismatching. The consequence of the experiments demonstrates that this method can shorten the time of registration and prompt the matching feature points.
Comparison of Different High-k Dielectric Materials in MOS Device from C-V Characteristics
Authors: Maity Niladri Pratap , Thapa R.K. , Baishya S.
Published: September 2013

In this paper different characteristic parameters using high-k dielectric materials in Metal Oxide Semiconductor (MOS) device have been compared from the theoretical and simulated Capacitance-Voltage (C-V) graphs. The simulation has been done using ATLAS device simulator. The agreement of the specified values while deriving and simulating and that extracted is excellent. Further, the extracted parameters for high-k dielectric materials show an inferior interfacial quality.
Simulation for Performance Based Evaluation in Buildings
Authors: Sairam R. , Raviteja P.L. , Naresh A.
Published: September 2013

From Uphaar Fire Tragedy to recent Mumbai Secretariat Fire accident shows how Vulnerable are Old Constructions, while new one are well designed with Necessary Fire Protection Systems. It is well known fact many of Old Structures in India doesnt have basic Fire Protection systems such as F.E. This paper is intended to study one of such old Constructions, a college Auditorium and Evaluate risk on loss of Life due to Suffocation and Thermal Injuries using Simulation
Research on the Observation Method for Asynchronous Motor Rotor Flux
Authors: Chen Xian Biao
Published: September 2013

Accurate acquisition of asynchronous motor rotor flux plays a significant part in the high-performance motor speed regulation system. For that reason, this paper gives the advantages and disadvantages of various methods for motor rotor flux observation based on the studying of them, also application guides are given. Finally, a combination model based on the voltage model of rotor flux observer and the current model of rotor flux observer is given, and simulation analysis based on the combination model is carried out by Matlab/Simulink to verify the effectiveness of it.
A Control Strategy for the Grid-Side Converter of the Directly-Driven Wind Turbine with PM Synchronous Generator under Unbalanced Grid Voltage
Authors: Cai Wei , He Hui Min , Wang Jian Wei , Su Shao Ze
Published: September 2013

A mathematical model of the full power grid-connecting converter at grid side for permanent magnet synchronous generator (PMSG) under unbalanced grid conditions is built, double-frequency oscillation mechanism on DC voltage is analyzed, and the influence of active power ripple of grid-connecting impedance on dual current control is discussed. To suppress the double-frequency oscillation on DC voltage, and take the grid-connected impedance on active power into account, a dual current control strategy, which based on respectively orientating positive-and negative-sequence voltages,is proposed, and introduced the correction value of active power ripple of grid-connecting impedance to correct reference current of proposed control strategy. Simulation results show that the proposed control strategy can effectively control positive and negative-sequence currents,eliminate the DC voltage double-frequency oscillation,and improve harmonic characteristic of grid-connected current.
Random Vibration and Fatigue Analysis of Pressure Vessel
Authors: Huang Mei , Yuan Hao , Ma Juan , Tang J.N.
Published: September 2013

In this article, finite element method is used to analyze the random vibration of the pressure vessel under the action of earthquake. The result shows that the maximum stress values are located at the bottom of the pressure vessel. At the same time, fatigue in this location has been analyzed. It can come to a conclusion that this pressure vessel meets the requirement of fatigue strength.
Thermodynamic Analysis of the Integrated Waste Heat Recovery System for Power Plant
Authors: Zhang Chang Shun , Xu Gang , Liu Tong
Published: September 2013

The thermal loss from the exhaust flue gas accounts for a large proportion of the thermal loss in the boiler. Under the pressure from the strict emission reduction policy and the rising fuel price, how to improve the fuel utilization ratio and reduce the coal consumption rate is of great significance in the electric industry. Based on the conventional waste heat recovery system, this paper proposes an integrated waste heat recovery system in reference with the German Niederaussem power generation unit. The integrated system improves the fuel utilization ratio and effectively utilize the waste heat with great economic benefits.
Under Voltage Load Shedding Clustering Control Based on PV Curve
Authors: Song Dun Wen , Miao Qian , Yang Xue Tao , Wu Li Hua
Published: September 2013

In order to prevent voltage collapse while the voltages drops, adopts under voltage load shedding (UVLS) clustering control to recover voltage stability. First using the method of sensitivity sorting to cluster the load node, then using PV curve to calculate and determine the number of loads to be shed, finally the same cluster taking the same control parameters to shed the loads, the simulation validate it could recovery voltage stability and embodies the rationality and economical efficiency of this method.
Research on Multi-Channel Adjustable DC Power Supply with Single Transformer
Authors: Zhang Ben Feng , Li Hua Feng , Li Su Nan
Published: September 2013

To meet the need of multi-channel DC power supply to activate multiple macro fiber composite (MFC) material simultaneously, a novel multi-channel adjustable DC supply using single-input single-output transformer based on spectral separation is proposed. A hybrid signal containing multiple frequency bands is boosted to obtain a high-voltage signal without bands change. Several frequency selection circuits are then used to separate individual signals in different frequency band from the high-voltage signal. Finally, these signals are rectified and filtered respectively to obtain multiple channel DC voltages. The feasibility of the proposed scheme is analyzed theoretically and verified by simulation. Experimental results prove that each part of the scheme runs reliable and the output is stable and adjustable.
Design for the Equipment Testing the Capability of Atmosphere of Ventilating Fans and Range Hood
Authors: Wang Xiao Ling , Tong Zhu Jue , Zhou Xu Ning , Fang Yi
Published: September 2013

In order to measuring the capability of atmosphere of ventilating fans and range hood, this article offered a measuring system for the capability of wind pressure and air volumes for ventilating fans and range hoods. The measuring method is determining the pressure difference on the two sides of a series of orifices, and then figuring out wind pressure and air volumes to determine the aerodynamics characters. By minicomputer and surveying sensors of the pressure, there are three parameters that must be tested called compressive stress, temperature and power. The data will be input into pc after it is converted by RS-485/RS-232 converter. The system designs an interface with visual programming tool Visual Basic to realize the function of data storage and data display.
A Novel Hybrid Unified Power Quality Conditioner (UPQC) for Medium-Voltage Power Grid
Authors: Zhu Tian Bo , Geng Hua
Published: September 2013

This paper proposed a three-phase three wire UPQC (hybrid UPQC). The topology is novel which consists of a series and a hybrid shunt filters. The unique topology can reduce the capacity of power devices in the hybrid UPQC when compensating source harmonic currents. In this paper a detailed design about the main circuit is presented. Finally a simulation study of the proposed hybrid UPQC has been carried out by using MATLAB/Simulink. The results verified the effectiveness of the UPQC topology.
Finite Element Analysis and Optimal Design of Commercial Vehicle Drive Axle Housing
Authors: Zhou Bing Bing , Li Hui Lin , Liu Qian
Published: September 2013

In order to solve the heavy mass problem of the commercial vehicle drive axle housing, the structure of axle housing is optimized with finite element method. At first, the parametric finite element model of axle housing is built by using ANSYS software, and the dynamic response characteristics of axle housing are obtained with transient dynamics analysis. The dynamic analysis results show that strength and stiffness of axle housing can satisfy design criteria very well. Then the fatigue life of axle housing are predicted based on the dynamics analysis, and results show that the fatigue dangerous regions occur on the spring seats. Finally, the structure optimization of axle housing is done aimed at lightweight with goal drive optimization method, and the fatigue life of optimized axle housing are verified with FEA and bench test. The results of verification by both FEA and test show that the optimized axle housing has apparent lightweight effects with its fatigue life meeting design requirements.
The Two-Level Method and its Application in Dynamic Optimization of a Truss
Authors: Zhang Cheng Liang , Yang Guang , Tong Zhi Qiang
Published: September 2013

A two-level method is presented to improve dynamic characteristic of a truss and let it out of the resonance region. The does is as follow: selected the desired design variable by sensitivity analysis, used the optimum solution of the subproblem approximation method as initial solution of the simplex method, and improved the simplex method by introducing golden section method. While ensuring requirement of strength, stiffness and stability, the two-level method makes the truss less weight and avoids the resonance region. The improved simplex method searches the better point further by introducing golden section method on the path of the extending principle and the shrinking principle and reduces searching times.
An Experimental Study on Dynamic Constitutive Relationship of 7075-T651 Aluminum Alloy
Authors: Kang Yong Gang , Yang Yuan , Huang Jie , Zhu Jing Hang
Published: September 2013

7075-T651 aluminum alloy are widely used in aeronautical applications such as wing panels, but there is no corresponding constitutive model for it now. In this paper, the flow behavior of 7050-T651 aluminum alloy was investigated by Split Hopkinson Pressure Bar (SHPB) and quasi-static compression experiment system. The strain hardening parameters were obtained by quasi-static compression experiment data, and the strain rate hardening parameters at various strain rates (1000-3000s-1) and room temperature, and the thermal softening parameter at various temperatures (20-300°C) where strain rate is 3000s-1 were obtained by SHPB experiment data. Then the constitutive equation of 7075-T651 aluminum alloy is obtained based on Johnson-Cook constitutive equation model.
Synchronization of Continuous Scalar Chaotic Signal from Uncertain Chaotic System
Authors: Wang Jing , Zhong Hui
Published: September 2013

This paper presents the synchronizing problem of scalar chaotic signal. A class of nonlinear chaotic systems is discussed which has unknown part in model. The proposed approach is based on canonical form of the response system. Simulation result shows the effectiveness of our synchronization scheme.
Saliency Map Based Defect Alarm System for FPC Roll-to-Roll Process
Authors: Chen An , Hu Yue Ming , Wu Xin Sheng , Gao Hong Xia
Published: September 2013

Defect rate in flexible printed circuit(FPC) industry is not so good. This paper propose a system and an algorithm to monitor appearance defects in FPC roll-to-roll process. This algorithm is based on selective attention mechanism computed by saliency map. Edge density is introduced as feature to compute the saliency map. Object’s distribution map is defined to help locate all the known objects in FPC. According to the particularity of roll-to-roll process, lateral difference operator is presented to highlight the defects. This operator’s algorithm involved the edge density maps and object’s distribution maps. Experimental data confirm the validity of the proposed system and algorithm.
A New Displacement Sensor Design Idea Based on Scribing Number Difference
Authors: Tan Wei Min
Published: September 2013

The paper introduces a new displacement sensor design idea called differential line grid sensor. It can gain more impulses and improve resolution power on the basis of the principle resembling that of vernier caliper through using the scribing number difference of two rulers with relative motion. The Parameter choice of differential line grid displacement sensor greatly affects the performance of the sensor. Several special factors need considering and rules need following. The working principle, the parameter design rules and the experiment result of the sensor are introduced particularly here.
Experimental Evaluation of a Buoyancy Driven Energy Storage Device
Authors: Alami Abdul Hai , Bilal Huma
Published: September 2013

An experimental study on buoyancy driven-storage device is presented in the paper. The proposed device is forced to descend into a tank filled with a certain fluid the tension of a nylon wire that allows it to remain stationary at the bottom of the tank until the energy is needed. It is then released to reach the surface of the fluid liberating energy during that process. This paper also briefly presents the theoretical background and compares it with the experimental results. The application of this research is related to energy storage by non-conventional energy sources during off-peak timings.
The experiments performed, have confirmed the validity of the approach and efficiency of the current system exceeds more than 40%. Other advantages like compact storage setups, higher energy density retrieval, longer life and low maintenance cost has made it more authentic than chemical storage devices.
Membrane Displacement Behavior of Capacitive Micromachined Ultrasonic Transducers under Static Bias
Authors: Maity Reshmi , Thapa R.K. , Baishya S.
Published: September 2013

The present paper focuses on the theory of vibration of a circular micro-machined ultrasonic transducer to model a single cell of Capacitive Micromachined Ultrasonic Transducers (CMUTs) and it describes the displacement behavior of membrane with respect to applied static bias following Masons analysis of a suspended membrane under tension. Analysis of the critical parameters like collapse voltage and membrane deflection is made and compared with experimental results to verify the validity of the model.
Effects of Section Size on the Stress Rupture Lives of the Machined Thin-Walled Slab Specimen of DD6 Single Crystal Superalloy at 980 °C/250 MPa
Authors: Yang Liang , Li Jia Rong
Published: September 2013

The effects of section size on the stress rupture lives of DD6 single crystal superalloy at 980 °C/250 MPa were investigated adopting machined thin-walled slab specimen. Stress rupture fractograph was analyzed. The results show that stress rupture lives of machined thin-walled slab specimen decline slightly with the reduction of section size at 980 °C/250 MPa, and stress rupture lives of thin-walled specimen are slightly lower compared with that of 5 mm in diameter standard cylindrically specimen, however, the stress rupture lives of thin-walled specimen are still about 200 hours. The decrease in effective loading area caused by oxidation is the main factor for the reduction of thin-walled stress rupture lives.
Study on Void Fraction Measurement Model of Gas-Liquid Two-Phase Flow Based on the Differential Pressure Sensor
Authors: Fang Li De , He Qing , Zhang Yao , Liang Yu Jiao
Published: September 2013

The paper bases on the differential pressure signal measured by the differential pressure sensor for the study and measurement of gas-liquid two-phase flow void fraction. We compare theory section void fraction and practical section void fraction with superficial gas velocity, the theoretical derivation formula has been observed and qualitatively explained.
Research and Development of a Novel DeviceNet-Oriented Interface System for IC Equipment
Authors: Jin Ni , Xu Ai Dong , Liu Ming Zhe , Wang Kai
Published: September 2013

At present, the interface system in IC equipment control software system has to be changed even when a small hardware change occurs, which increases the time and cost of system debugging. This is one of the technical problems needed to be solved in course of development of IC equipment control system software.Therefore, the characteristics of the semiconductor device in IC equipment which used the DeviceNet has been analyzed in this paper. Then one DeviceNet-Oriented interface system, which is capable of shielding the difference of the details of the hardware, has been designed and developed.