bluuebunny/crossref_metadata_2025 huggingface dataset:
Experimental Research on the Stiffness of Air Spring
Authors: Zhou Tong , Zong Chang Fu , Chen Shuang
Published: September 2013

This study analyzes the stiffness of air-spring theoretically and provides the influential parameters of air-springs stiffness briefly. Through the test rig, we conduct the experiment of air-springs stiffness and then get the relationship between air-springs stiffness and the influential parameters; through fitting the experimental data, we get the relationship among valid-area, valid-volume and the vertical displacement of air-spring, supplying the necessary parameters for the development of air suspension control strategy.
Exploration and Construction of Smart Library Based on RFID Technology
Authors: Luo Yong Cheng , Cao Jing Jing , Qian Jing Fang
Published: September 2013

This paper analyzes the basic system architecture of smart library based on RFID technology, which is composed of perception layer, network layer and application layer. It further explores the cloud services and large data processing technologies. According to the experience in the construction of Donghua University Library, we propose some problems which should be paid attention in the implementation and construction of university library, such as the construction of librarians, privacy protection and standardization.
Design and Research on Automatic Opening Device for the Medical Ampoule
Authors: Wang Kai Bao , Yang Qiu Xiao , Song Guang Hao , Wang Bo , Ma Wen Kai
Published: September 2013

In various medical institutions, the ampoule is an essential container in daily medical operations. The automatic opening device for medical ampoule based on optimization design method and dynamics analysis is introduced in the paper. The automatic opening device can be used in the place of hospitals and clinics and fitted for different specifications of the ampoule. The necessary operational process that included nick, disinfection and break in the work of ampoule opening was integrated in the device. The work efficiency was improved greatly through the mechanisms arranged in circular. In the process of using, all ampoules kept an intermittent motion in a circulation under the control of transmission unit. The process of automatic opening will be completed in its cyclical-intermittent motion in about 30 seconds. In the research, the virtual prototype technology was used to simulate the kinematics and dynamics characteristics of the mechanical system. The feasibility of the design scheme of mechanical system was proved with the simulation analysis results. The equipment has advantages of the structure is compact, safe and reliable, easy to use. The research of the automatic opening device for the medical ampoule can be regarded as the reference of the related research.
The Impact of Image Parameters of Indirect Viewing Systems on Driver Fatigue and Task Performance
Authors: Bao Jie , Wu Zhi Cheng , Wu Jing Jie , Pei Peng Peng , Liu Chang
Published: September 2013

In certain driving situations, indirect viewing systems can support drivers when the drivers field of view is restricted. For some special vehicles, by applying indirect vision driving system, drivers could be protected from the dangerous working environment. In four experiments, we measured drivers task performance, workload and fatigue in different viewing systems. The image parameters considered here are camera lens field of view (FOV), image magnification factor and camera viewpoint. The results indicate that larger driver's field of vision causes greater driving fatigue while a smaller image magnification factor could reduce the drivers fatigue. Besides, the differences between eye point and camera viewpoint wont cause driver extra fatigue, but will result errors in the estimation of lateral and longitudinal position. In addition, the participants drove the course faster with natural vision than they did with the indirect vision systems. A smaller image magnification factor can improve the drivers task performance.
Detecting Driving Fatigue of Indirect Vision Driving Based on Electroencephalogram
Authors: Liu Chang , Chen Si Zhong , Pei Peng Peng , Zhang Kun , Bao Jie
Published: September 2013

indirect vision driving for Vehicle is a kind of technology which lets the driver gets correct road information in order to ensure normal driving with the use of the camera and displays. After introducing the ergonomic theory of driving fatigue and the development of driving fatigue detection at home and abroad, mainly use EEG to judge the driving fatigue level of indirect vision driving. The experiment results show that greater fatigue is brought to the driver on the condition of indirect vision driving compared with the direct vision driving.
Development and Design of the Pull Detection System
Authors: Zhang Fei , Ding Hong , Yao Bao Guo
Published: September 2013

Because the industrial control systems were often used in different manufacturers and different types of equipment, how to uniform the different equipment communication interface was a big problem. The real-time communication between Personal Computer and S7-200 PLC had been achieved by using the Siemens configuration software PC access and VC++ application programming. The pull detection system was designed by using this OPC method. In the paper the client design and the modular program design of the pull detection system were explained in details. At present, the system was used in the factory and it was running stable with good results.
Research on Indicator Diagram of Shock Absorber Fault Recognition Based on Support Vector Machine
Authors: Xie Wei Dong , Gao Kan , Shen Ji Sheng
Published: September 2013

In order to meet the development of shock absorber on-line detection, a new method of indicator diagrams recognition for shock absorber based on support vector machine (SVM) is proposed. Different fault patterns of shock absorber indicator diagram are discussed, including their main causes. The recognition model is constructed each with Linear, Polynomial and Radial Basis Function (RBF) kernel function. The experimental results show that the best average recognition rate is 96.4%. This method is effective in indicator diagram fault recognition of shock absorber.
Understanding Effectiveness of Eco Monitoring Networks: Information Theoretical Perspective
Authors: Li Su Min
Published: September 2013

This work studies eco monitoring networks. As eco monitoring networks have been used to monitor large networks, questions arise whether decentralized inference is efficient and whether an eco monitoring network with a moderate size can monitor an underlying network at the Internet scale. This work studies the local effectiveness of decentralized inference done by individual monitors. Information theoretical measures, i.e., conditional non-uniformity factor is applied to quantify the effectiveness. Large-scale data from DShield is used to access the effectiveness of a real eco monitoring network.
3G and DDNS-Based Remote Monitoring and Management System for the Orchard Environment
Authors: Qiu Yun , Xia Xue , Lin Hu , Zhou Guo Min
Published: September 2013

In view of such characteristics as of the faraway and scattered orchard monitoring sites, complex environmental elements, great weather effect and difficult monitoring and management, it has studied the remote monitoring and management system for the orchard environment in which the 3G technology and DDNS dynamic domain name technology are used as the wireless communication network: That is to say, the 3G network is used in combination with the DDNS domain name technology to remotely transmit orchard meteorological environment factors such as the air humiture, soil humiture, rainfall and solar photosynthetic radiation perceived by the in-orchard sensors and the fruiter video images to the monitoring centers server and the ASP.NET and ADO.NET technologies to implement the real-time publication on the Internet of the orchard environmental data, so as to provide the users with the remote monitoring and management for the orchard environment.
Modeling and Analysis of a Circular Wave Energy Conversion System
Authors: Fang Hong Wei , Fang Si Yuan , Yang Run , Zhang Xiang Ling
Published: September 2013

A circular wave energy converter (WEC) is put forward to solve the cable loosing problem of the non-circular structure WEC model. The circular device mainly consists of a double acting ratchet, cable, a driving wheel, four fixed pulleys, a counterweight, a gear box and a generator. In this modified model, the weight of counterweight is smaller than that of the float. The model can obtain a bigger maximum and average driving torque when the float rises, so that the utilization rate of wave energy is improved. Moreover, the influence of the float shape is also discussed.
Relative State Estimation for Spacecrafts in Proximity in the Presence of Sensor Noise
Authors: Huang Xu , Yan Ye , Zhou Yang
Published: September 2013

This paper develops a relative position and velocity estimation approach for spacecrafts in proximity. A dynamical model is built at first to describe the relative motion between the chaser and target. In this approach a light detection and ranging (LIDAR) system is used to perform the range and angle measurements of the target relative to the chaser. The three-axis magnetometer (TAM) and gyro are installed on the chaser to measure the chasers attitude. An extended Kalman filter (EKF) is designed to estimate the relative state by combination of the measurements and dynamical model. Numerical simulations prove the validity of proposed filter.
Design of Low-Voltage Power Supply Drive Circuit Based on the Piezoelectric Ceramic Transformer
Authors: Yang Yue Ting , Ding Yan Song , Liu Jia Jian
Published: September 2013

The piezoelectric ceramic transformer has the advantages of high conversion efficiency, high pressure, electromagnetic compatibility,etc.It overcomes the shortcomings of large electromagnetic interference, low conversion efficiency , a large volume, etc. Using IR2184,the paper designs piezoelectric ceramic transformer full-bridge driver circuit. It greatly improves the conversion efficiency of the power system and power.
A Novel Method of Smooth Fitting for a Class of the Spatial Convex Cavities in the Multiply Connected Domain
Authors: Cao Jia Lian , Wan Chao Yan , Zhao Wen Zhong
Published: September 2013

According to a class of closed surfaces fitting problem which cant be solved by using maximum entropy function under the rectangular coordinate system, a new method of smooth fitting for a class of the spatial convex cavities in the multiply connected domain by some planes: the envelope algorithm of minimum entropy function is promoted to the spherical coordinates system, for every closed areas by which the border of spatial convex cavities construct, separately the suitable control parameter is chosen, the minimum entropy function is used to smooth the spatial convex cavities in the multiply connected domain. The smooth fitting graph can be drawn based on the function. This method can be used in soma fields such as closed surface modeling, mold designing, mold manufacturing and reverse engineering.
Three-Level Grid-Connected Inverter Based on Voltage-Oriented Control in Photovoltaic Generation Systems
Authors: Zhao Fang Ping , Yang Yong
Published: September 2013

The paper propose a new control of a three-phase three-level neutral-point-clamped (NPC) pulse width modulated (PWM) inverter in photovoltaic generation systems. The control scheme is mainly based on voltage-oriented control (VOC) with an improved maximum power point (MPP) tracking (MPPT). A cascaded control structure with an outer dc link voltage control loop and an inner current control loop is used. The currents are controlled in a synchronous dq reference frame using a decoupled feedback control. Furthermore, in order to achieve a unity power factor, the q-axis current reference is set to zero. The experimental results have proven an excellent performance and verified the validity of proposed system.
Analysis, Design and Implementation of FSK Modulate Systems
Authors: Wu Chang Fu
Published: September 2013

The hybrid signals are the combined signals with multi-modulation mode. With multi-modulation, the disadvantages of single-modulation (such as FSK, PSK and PPM) can be eliminated. By taking the advantages of different modulations, the performance of range resolving, Doppler resolving and low probability of intercept (LPI) of the signal can be improved. FSK/PSK radar signal is the signal with both FSK and PSK modulation at one time. It is with large Bandwidth Time product (BT), thumbtack-like ambiguity function and well ability of Anti-EMI. The FSK/PSK signals of which the frequency-hopping and bi-phase sequences were randomly chosen often had high side lobe level. With the simulation and analysis using MATLAB, the method of FSK modulation is made analysis. As a result, the automatic modulation recognition is one of the necessary functions.
Big-Screen Text Input System Based on Gesture Recognition
Authors: Guo Xing , Lu Zhen Yu , Xu Rong Bin , Liu Zheng Yi , Wu Jian Guo
Published: September 2013

Now more and more based on gesture interaction system applications, but there are simple gestures to operate the mouse interaction, no text input to the system function. In this paper, the blind letters gestures as input gestures ,using kinect to get the depth image, gestures split, use SIFT feature extraction, then get manual alphabet as Pinyin input method to provide an Chinese character input to the system.
The Simulation Analysis of Channel Estimation Based on LS and MMSE Alrorithms
Authors: Li Jiao Jun , Chen An Zhi , Zhang Ting , Su Li Yun
Published: September 2013

Due to the complex propagation caused by the multipath effect, the time-varying characteristics, the frequency selective fading and other factors of the wireless communication, consequently, the channel estimation is an important component in the receiving system with high performance. In this paper, comparisons with regard to the mean-square error and bit error rate are made in the WPDM-CDMA system based on two typical channel estimation algorithms, including the least squares error (LS) algorithm and the minimum mean-square error (MMSE) algorithm.
An Algorithm of Face Recognition Feature Extraction Based on ICA
Authors: Zhou Ze Hua
Published: September 2013

Recently, automatic face recognition method has become one of the key issues in the field of pattern recognition and artificial intelligence. Typically, the face recognition process can be divided into three parts: the detection and recognition of human face, facial feature extraction and face recognition, and among which the facial feature extraction is the key to face recognition technology. In this paper, an extraction algorithm of face recognition feature, which is based on face recognition feature, is proposed. The experimental results based on the ORL face database demonstrate that this algorithm works well.
Research of the Applicability of the Active Laser Turbulent-Degraded Image Recognition Algorithm
Authors: Zhang Yao , Liu Xiao Ya
Published: September 2013

The Scintillation effect of turbulence on laser measurement in high temperature environment will cause light moves, bend, or shake according to the ideal path. The object will have fuzzy dispersion and abnormal image on focal plane. By measuring the thickness of the high-environment glass, using characteristics of the distribution of the linear array CCD image spot inner-pixel grayscale in high-temperature environment and high relevance between each image spot, to create a mathematic model which can report the relationship between grayscale of the target area and the location of the center of mass of the target image spot as accurately as possible. By using this model, the accurate estimation of the location of the target point will be achieved.
The Application of Dynamic Programming in the System Optimization of Environmental Problem
Authors: Zhao Jing Jing , Liu Bao You , Wei Fu Xiang
Published: September 2013

Based on the application in the system optimization of environmental problem, the solution procedures of dynamic programming are introduced. Combining with some typical problems, such as the shortest path problem, the optimum scheme problem of water treatment and the water resources allocation problem, reliability analyses of the solution procedures by LINGO software is processed. The results show that the LINGO software can effectively solve this kind of dynamic programming problem and is the effective tool to solve the environmental problems and resource problems.
DCS Simulation Modeling and Development for Ethylene Cracking Plant
Authors: Qi Xiang Yang , Li Guo You
Published: September 2013

On the basis of the analysis of ethylene cracking process, equipment, process control and operation conditions, using process control system simulation platform, Ethylene cracking plant DCS modeling and simulation training system were developed. Using continuous modeling method, combined mechanism modeling with test data analysis, DCS control system mathematic model was established, by which normal operation, start,shutdown process and accident treatment process were simulated. The online evaluating system was developed too, which supply a virtual platform for the training of ethylene cracking process.
Experimental Investigation on Ground Surface Morphology of Particulate Reinforced Titanium Matrix Composites
Authors: Miao Qing , Ding Wen Feng , Xu Jiu Hua , Zhao Biao , He Jian
Published: September 2013

Particulate reinforced titanium matrix composites (PTMCs) are attracting increasingly attention in various engineering applications. In this paper, comparative grinding experiments of PTMCs were carried out using WA abrasive wheel and CBN abrasive wheel. The morphology of the ground surface was observed by scanning electron microscope. The main results are summarized as follows: (1) The damage of reinforcements in the PTMCs results from the plowing and shearing during grinding in the form of crater, micron gap, broken, coating and micron crack. (2) The formation of grinding chip is a function of the collaborate removal of reinforcements and matrix material. (3) The surface fracture pattern of PTMCs using WA wheel is to form the grinding chip through severe extrusion. While using CBN wheel, the abrasion due to the formation of the wear debris is the main surface fracture pattern of PTMCs.
A Method of Knowledge Integration of Agricultural for Biological Disaster Alarming
Authors: Dai Xiao Peng , Hao Wang
Published: September 2013

The correct basis for early warning of biological disasters is to master the knowledge of biological disasters. In the paper, Analysis Knowledge integration of the idea of biological disasters. Proposed a framework for knowledge integration of biological disasters and Constructing ontology of biological disasters
Finite Element Optimization of Electric Field Structure in Electrospinning
Authors: Dai Ye , Sun Li Li , Ren Sheng Le , Ma Rei Dong
Published: September 2013

Electrospinning technique is currently one of the most important methods for preparing nanofiber. According to the fact that the electric field at the receiver is relatively weak, the electric fields distribution in the typical electrospinning device was calculated and analyzed by ANSYS. It put forward the method of optimizing electric fields distribution by using an auxiliary electric field device. At the same boundary conditions, the electric fields distribution in the original device and improved binode device are compared. The simulation analysis provides an effective reference for the optimization design of electric fields distribution in the electrospinning device.
Submarine Launching Anti-Surfaceship Missile Firepower Allocation and Optimization Based on Partheno-Genetic Algorithm
Authors: Zhang Wen Yu , Li Chang Jun , Wu Peng
Published: September 2013

Anti-surfaceship missile firepower allocation is a complex and important problem to submarine command. The method of partheno-genetic algorithm (PGA) is suit for firepower allocating. While keeping the virtues of traditional genetic algorithm, PGA overcomes its defects. Because of employing more simply operators, PGA decreases the complexity of calculation. Basing on the mathematics model of missile firepower allocation and building the steps of PGA, a case of firepower allocation to submarine by PGA was applied. Simulation results indicated that PGA is a simple, effective and fast algorithm. PGA can solve the submarines missile firepower allocation problem effectively and can be satisfied with the requirement of real-time and fast to submarine command.
Delay-Dependent Stochastic Stability Analysis of Singular Hybrid System
Authors: Lu Hong Qian , Liu Xing Ping , Zhou Wu Neng
Published: September 2013

The problem of Stochastic stability analysis for singular time-delay hybrid system with Markovian jumping parameters and standard Wiener process in this paper. Based on linear matrix inequality approach, a delay dependent condition is proposed, which ensures the singular hybrid system is stochastically stable.
Numerical Simulation of Turbulent Driven Secondary Flow in a 90° Bend Pipe
Authors: Chen Min , Zhang Zhi Guo
Published: September 2013

The numerical simulation of the developing turbulent flow through a three-dimensional curved pipe with strong curvature is presented. This numerical simulation is to investigate the flow structure of pipe-flow through a 90° bent pipe with the aid of RNG k-ε turbulence model, which had been well validated for high screwed curvature flow. Dean Motion downstream of the bend are found and presented. And the numerical result demonstrates that Dean motions co-exist with large scale swirling motions inside the bend pipe. Snapshot of velocity and pressure reveals that the structures found upstream of the bend persist after the bend and survive the strong secondary motions induced by the pipe curvature.
A Method for Ranking Battlefield Damaged Equipment Repairs Based on TOPSIS
Authors: Dong Yu Cai , Pan Xue Qin , Wang Xiao Yan , Yao Jun Jie , Liu Jun Hong , Jin Qi
Published: September 2013

Battlefield damaged equipment repairs of multi-objective decision-making are sorted by the method of TOPSIS. It constructs ideal solution and negative ideal solution of ranking battlefield damaged equipment repairs, compares the proximity of equipment and the ideal solution and gets the order of battlefield damaged equipment repairs. The example is applied to explain application effect of this method. The experiment shows that the method is easy to decision-making, strong objectivity, applicability and operability, has great significance to enhance the combat effectiveness of troops.
Application of an Improved Genetic Algorithm with the Search Space Compression in TSP
Authors: Song Yi , Wei Ni Ni
Published: September 2013

The Traveling Salesman Problem is a combinatorial optimization problem, the problem has been shown to belong to the NPC problem, the possible solution of Traveling Salesman Problem and the scale of the cities have the exponential relation, so the more bigger of the scale. In this paper, improve the search process of the genetic algorithm by introducing the idea is to compress the search space. The simulation results show that for solving the TSP, the algorithm can quickly obtain multiple high-quality solutions. It can reduce the blindness of random search and accelerate convergence of the algorithm.
A Smoothing Newton Method for Solving Absolute Value Equations
Authors: Jiang Xiao Qin
Published: September 2013

In this paper, we reformulate the system of absolute value equations as afamily of parameterized smooth equations and propose a smoothing Newton method tosolve this class of problems. we prove that the method is globally and locally quadraticallyconvergent under suitable assumptions. The preliminary numerical results demonstratethat the method is effective.
On the Partial Stochastic Stability of Stochastic Differential Delay Equations with Markovian Switching
Authors: Liu De Zhi , Wang Wei Qun
Published: September 2013

In the paper, we are concerned with the partial asymptotic stochastic stability (stability in probability) of stochastic differential delay equations with Markovian switching (SDDEwMSs), the sufficient conditions for partial asymptotic stability in probability have been given and we have generalized some results of Sharov and Ignatyev to cover a class of much more general SDDEwMSs.
Object Tracking Based on Corrected Background-Weighted Histogram Mean Shift and Kalman Filter
Authors: Yang Yu , Jia Yong Xing , Rong Chuan Zhen , Zhu Ying , Wang Yuan , Yue Zhen Jun , Gao Zhen Xing
Published: September 2013

The classical mean shift (MS) algorithm is the best color-based method for object tracking. However, in the real environment it presents some limitations, especially under the presence of noise, objects with partial and full occlusions in complex environments. In order to deal with these problems, this paper proposes a reliable object tracking algorithm using corrected background-weighted histogram (CBWH) and the Kalman filter (KF) based on the MS method. The experimental results show that the proposed method is superior to the traditional MS tracking in the following aspects: 1) it provides consistent object tracking throughout the video; 2) it is not influenced by the objects with partial and full occlusions; 3) it is less prone to the background clutter.
Improved Term Selection Algorithm Based on Variance in Text Categorization
Authors: Li Ran , Guo Xian Jiu
Published: September 2013

This article improves the algorithm of term weighting in automated text classification. The traditional TFIDF algorithm is a common method that is used to measure term weighting in text classification.However, the algorithm does not take the distribution of terms in inter-class. In order to solve the problem, variance which describes the distribution of terms in inter-class and intra-class is used to revise TFIDF algorithm. This article mainly researched about the construction of LFHW term sets and new approaches to term weighting, These new approaches are also applied to the hierarchical classification system.Compared with traditional TFIDF algorithm ,the results of simulation experiment have demonstrated that the improved TFIDF algorithm can get better classification results.
Research on the Intelligent Course Schedule Systems for Civil Engineering in Colleges under Multiple Constraints
Authors: Li Hui , Li Yu Ji , Zhang Jing Xiao , Lu Cai Wu
Published: September 2013

The University Timetable Problems in Civil Engineering hinders the multi-targeting combinatorial optimization of teaching resources in colleges and universities. In this paper, it is studied how to adopt ant colony genetic algorithm to set up the course schedule system for civil engineering in colleges and universities, which makes the population form partitions according to rules in the genetic process, spray pheromones in the partitions, with the chromosome fitness and the population partitions crossing over with each other, to form a positive feedback system. As the experiment shows, through this method, the searching space can be reduced effectively, and the complexity of programs is simplified, so the time spent in generating optimal course schedules can be shortened.
An Algorithm of Global Path Planning Applied for Rapid Prototyping
Authors: Han Wen Chao , Li Lun , Lai You Bin , Wang Fu Yu
Published: September 2013

This paper presents an algorithm to develop a path planning applied for the rapid prototyping. Filling the layer region completely is the key to product accuracy of the part ,which is depending on path planning. It can improve the effective of the scanning speed during prototyping. It divides three steps. First of all, it uses the zigzag technology to plan the scanning path, then links the different path on the same layer based on kd-tree technology and links pathes on the different layer at last. In order to diminish the deformation and shrinkage during the process prototyping, it uses the reversed orientation in the different layer. The correctness of the algorithm is verified by experiment. Compared with the rest algorithm , it is more rapid and accurate.
A Project-Based Approach to Teaching Programmable Logic Controller Course
Authors: Ren Guo Yan , Ren Guo Mei , Tang Yi
Published: September 2013

Sequential control using ladder logic, Programmable Logic Controllers (PLCs), and operator interfaces are commonly used in the manufacturing industry today. The introduction course of programmable logic controller is a course that needs a lot of practice. We present a project-based approach to teaching it by introducing real engineering projects into the process of theory teaching. The students show more enthusiastic during learning course and their abilities of solving engineering problems are greatly enhanced.
Zero-Copy Implementation in the Linux Operating System
Authors: Hu Xian Chuan
Published: September 2013

In this paper, we integrate the DMA data transmission technology and memory mapping technology to implement zero-copy in the Linux operating system. Zero-copy allocates memory address space to network card. In this case, the network card directly transmits the received data to the memory space allocated in advance when the network card transmits the data to the Linux kernel by using DMA. After that, zero-copy maps the allocated memory space to the process space of the user application. And then, the user application can access this allocated memory space directly and reduce the memory copies between the kernel and user space.
Mechanical Modifications to Convert Small Two Strokes Carbureted Engine to Electronic Fuel Injection System Engine to Reduce Emission and Fuel Consumption
Authors: Sapate Kumar D. , Tikekar A.N.
Published: September 2013

The evolution of four stroke engines and improved environmental pollution control norms has pushed the two-stroke engines towards obsolescence due to their inherent design problems. This has made the existing manufacturers & users of two-stroke engines a setback. In this paper attempt has been made to high light the performance parameters in respect of fuel efficiency and emission control. In this research work an effort is made to retrofit the commonly used two stroke engine for optimal performance by using EFI engine. It mainly includes injector locations with reference to spark plug which decides the combustion efficiency of engine. It also includes the location of different sensors and subsequent modification of silencer. As the automobile engine has to operate at higher speeds, proper and firm mounting of different electronic part is essential which affects the performance of engine. After mechanical modification of engine with EFI system it is tested by connecting it to dynamometer. The results are compared with that of carbureted engine.
Uncertainty Modelled Power Flow Analysis for DG Sourced Power Systems
Authors: Sivakumar P. , Poornima D.
Published: September 2013

For growing of electrical demand in the modern world energy requirement is tremendously increased day to day power market. Nowadays the non-conventional energy sources are utilized to meet out the current power demand through PV, wind and other non-conventional resources etc. In this concern the energy drawn from the other non-conventional energy sources is highly variable due to the nature of uncertainties. Hence the optimal load dispatch of the power is highly difficult, one of the attempts is to eradicate this difficulty by adding developed uncertainty model of PV and wind sourced power generation in power system network. Uncertainties of PV irradiation and wind speed models are developed by using generic probabilistic approach. By using this hybrid system, instantaneous power flow of a DG system is obtained through Monte carlo simulation (MCS) in the MATLAB/SIMULINK packages. Enhancement of optimal power flow (opf) and system reliability due to addition of uncertainty variables in DG sourced power systems.Index TermsLoad flow analysis, Monte Carlo simulation (MCS), integration of Photovoltaic generator and wind (PVG and WEG).
Modelling and Simulation of 3-phase Transformerless Split Inductor Multilevel Inverter for Grid Connected Photovoltaic System
Authors: Bharatiraja C. , Palanisamy R. , Sadagopan Sushuruth , Latha R. , Dash S.S.
Published: September 2013

A Split inductor is used with Exiting Inverter to interconnect inverter with grid connected system which avoids the usage of transformer. While using split inductor NPC-MLI shoot-through problems are producing in the bridge legs of an NPCTLI, its operation stability is ruined. Hysteresis Current Control (HCC) offers an excellent current control performance to NPCTLI. It acts based on the error current value i) and hysteresis band value (h). The proposed topology guarantees for no common-mode voltage, shoot-through possibility and capacitor balancing problem. Finally, the simulation results of a proposed SI-NPCTLI system verified using MATLAB SIMULINK.
Three Phase Hybrid 7-Level Inverter with 60 Degree PWM Scheme for PV Applications
Authors: Abirami R. , Jaikrishna V. , Chellammal N. , Subhransu Dash Sekar , Velmurugan V.
Published: September 2013

In this paper, a hybrid multilevel inverter (MLI) with reduced number of components is modelled by deriving its source from solar PV array. The power switches of this MLI are controlled by utilizing the pulses derived by comparing the reference and carrier signal. The reference signal for the modulation process is based on 60 degree PWM. The carriers considered for the modulation process are triangular carrier wave and inverted sine carrier wave arranged in phase Disposition (PD) multicarrier method. The output voltage waveform of this hybrid MLI under consideration is analyzed with different performance parameters like Total Harmonic Distortion (THD), RMS Voltage, DC utilization Rate and harmonic spectrum. The simulation results show that the inverted sine based PD technique is yielding better performance than that of other technique. The above mentioned are examined with the help of MATLAB / SIMULINK.
Investigation of the Beginning of Plastic Yielding and the Hardening Behaviour under Biaxial Tension
Authors: Suttner Sebastian , Kuppert Andreas
Published: September 2013

The main focus of the experimental observation deals with the investigation of the plasticyielding of DC06 and DP600 under biaxial tension in comparison to an identified material modelwith an isotropic hardening behaviour. The isotropic hardening law describes the hardeningbehaviour of the material by application and approximation of the flow curve. Prevalent hardeninglaws are proposed by Swift (1952) or Hockett and Sherby (1975) and lead to an expansion of theyield surface in the stress space. By reasons of good accordance in an earlier survey the givenmaterials are modeled by the yield criterion Yld2000-2d and the isotropic hardening law of Swift.In this case the yield loci at different experimental states of plastification are compared with theyield loci given from the isotropic expansion of the Yld2000-2d yield surface. Furthermore apossible approach for modelling the change of the yield criterion’s shape in the stress space duringplastification is shown. With respect to further investigations additional research work is neededincluding extended and complex hardening laws to describe the real material behaviour sufficiently.
Coating of Deep Rolled and Hammer Peened Deep Drawing Tools
Authors: Steitz Manuel , Weigel Kai , Weber Martin , Scheil Jan , Müller Clemens
Published: September 2013

Mechanical surface treatments like machine hammer peening and deep rolling can substitute an essential part of the manual polishing time in the conventional process chain of die and mold production. However, the increasing use of high strength steels in the automotive industry and the associated wear of deep drawing tools require further wear-protection methods. In this context it is still unknown if hammer peened and deep rolled surfaces can ensure a sufficient adhesive strength of a coating. Therefore, in the present work different coatings are applied on hammer peened and deep rolled surfaces. Finally, the wear behavior is examined in the strip drawing test. The evaluation of the experimental results proves the potential for an industrial application of the mechanically treated and coated tools.
Theory of Small Machine Tools: A Framework Approach to Machine Development
Authors: Röhlig Benny
Published: September 2013

Enabled by their size, small machine tools manufacturing small workpieces allow for a leap of improvements and therefore overcome current limitations in micro manufacturing. Nevertheless, to achieve those benefits the classically engineering mindset and machine tool design have to be overcome. Those ideas, the reasoning behind them and the corresponding conditions are laid down in the so called theory of small machine tools. The generic theory includes a framework approach to help in the process of machine development resulting in a new kind of miniaturized and function integrated machine tools. This conceptual contribution describes the idea, aspects, objectives and methodology pursued by the theory of small machine tools.
Technology Selection for Electric Drive Production with a Game Theoretic Approach
Authors: Lanza Gisela , Stoll Johannes , Gerbe Sven
Published: September 2013

To solve the supply chain decision problem of technology selection for electric drive production, the authors chose a game theoretic approach to model and solve the bargaining situation of manufacturer (OEM) and supplier. The OEM can decide between a same part strategy and a differentiating strategy with increasing sales potential as well as higher complexity and production costs. The supplier has to choose a production technology and can decide between a specialized technology (e.g. punching) and a flexible technology (e.g. laser). Using the specialized technology the variable costs per piece are lower but every additional variant causes additional tool investments (e.g. punching dies). The interdependence of a supplier’s choice of production technology and its customer’s decision, regarding the number of different product variants that he wishes to source, is modeled as a non-cooperative game in strategic form. The resulting Nash equilibriums in pure and mixed strategies are determined with respect to the investment costs faced by the supplier, the target market conditions and the cost share passed on to the supplier’s customer.
Ethanol Sensing Characteristics of Sn-Doped ZnO Tetrapods Sensor
Authors: Santhaveesuk Theerapong , Choopun Supab
Published: September 2013

Sn-doped ZnO tetrapods (T-SnZnO) were successfully synthesized using a simple thermal oxidation reaction method. Zn powder with 20 mol% of Sn powder was used as raw material and synthesized at temperature of 1,000°C under normal atmosphere. FE-SEM images revealed that the T-SnZnO exhibited a four symmetry legs with the length of 1.94±0.42 μm and the width of 260±40 nm. EDS analysis confirmed that the tetrapods contain small amount of Sn. XRD analysis indicated that the tetrapods exhibited a wurtzite hexagonal ZnO structure corresponded to Raman results. The lattice parameters a and c were 3.2494 Å and 5.2057 Å, respectively. The T-SnZnO were fabricated as ethanol sensor and tested with ethanol concentration of 50, 200, and 1,000 ppm at operating temperature between 280°C-340°C by observing I-V curve of the sensors. The sensor response increased as the increasing of the operating temperature and the ethanol concentration. Moreover, the enhancement of ethanol sensor response was observed, and the highest sensor response of 30.4 was detected at 340°C. The sensor response was higher than those of ZnO tetrapods, TiO2-ZnO tetrapods, ZnO nanowires, and TiO2-ZnO nanowires sensors.
Preparation and Properties of Electrospun PVC Nanofiber
Authors: Phatcharasit Kritsada , Taweepreda Wirach , Boonkerd Kanoktip , Kim Jin Kuk
Published: September 2013

Nanofibrous membranes based on poly (vinyl chloride) (PVC) were prepared by electrospinning. The morphology of nanofibrous was observed under field emission scanning electron microscope (FE-SEM) and effects of instrument parameters including electric voltage, tip to collector distance, and solution parameters such as PVC concentration and mixed solvent of THF and DMF (50:50) were evaluated. The beads on the fiber were formed with low concentration of PVC. The dielectric constant, thermal properties and crystallinity of the electrospun membranes were characterized by precision LCR meter, and differential thermal analysis (DTA), respectively. It was found that smooth surface of electrospun PVC nanofiber had a high ionic conductivity and their thermal properties were improved comparing with PVC sheet.
Low-Temperature Synthesis of Nanocrystalline ZnO Nanorods Arrays
Authors: Kalasung S. , Chananonnawathorn C. , Horprathum Mati , Thongpanit P. , Eiamchai Pitak , Limwichean S. , Pattanaboonmee N. , Witit-Anun Nirun , Aiempanakit K.
Published: September 2013

In this present research, vertically aligned ZnO nanorods arrays were grown on silicon wafer (100) substrates from a zinc nitrate hexahydrate and hexamethylenetetramine solution by a cost effective and low temperature (90 °C) hydrothermal growth method. Field-emission scanning electron microscopy (FE-SEM) and X-ray diffraction (XRD) were used to analyze morphology, crystallinity and film thickness, respectively. It was demonstrated that when the seed layer thickness change from 18 to 200 nm, the nanowire density increased. Our result presented a scalable method for fabricating ZnO nanorods arrays with potential for a lots of application such as micro/nanosensors and the nanoelectronic devices.
Investigate the Properties of Y211 Doping Effect in the New Superconducting Y7Ba11Cu18Oy Compound
Authors: Kruaehong Thitipong , Sujinnapram Supphadate , Nilkamjon Tunyanop , Ratreng Sermsuk , Udomsamuthirun Pongkaew
Published: September 2013

The new superconductors of Y-based compound, Y7Ba11Cu18Oy(Y7-11-18), has been discovered by solid state reaction with the different ratios of raw materials. All obtained samples were analyzed and characterized by XRD and the FULLPROF program. The lattice parameters of Y7-11-18 were a=3.8268 Å, b=3.8810 Å and c= 69.8794 Å. The Y7-11-18 showed the sharp transition curve of resistivity (ρ) at the critical temperature (Tc) =94 K. The doping of Y2BaCuO5 (Y211) showed that the higher Y211, the lower Tc and c lattice parameter. The SEM and EDX micrographs showed the grain size about 1-5 μm and without impurities. The DTA analysis resulted the decreasing of peritectic temperature from 962.74 °C by the higher Y211 contents.
Structural Evolution of Cu-In-Se Thin Films Prepared by Spin Coating Technique
Authors: Lipiwongwattanakit Kentreeda , Chityuttakan Chanwit , Onreabroy Wandee , Chityuttakan Panita
Published: September 2013

A low cost and simple fabrication of Cu-In-Se polycrystalline thin film for copper indium diselenide solar cell was prepared in a two-step process. The first step, a Cu In precursor film was prepared from copper acetate monohydrate and indium acetate mixed solution. The solution was coated on molybdenum-coated soda lime glass using the spin coating technique at room temperature following annealing in air at 500°C for 20 minutes. The effect between spin parameters and film thickness of as-deposited Cu-In film were investigated. The second step, selenium was added in the precursor film by selenization process at 450°C in Se atmosphere for 30 minutes in a low vacuum tube furnace with background pressure of 10-2 mbar. The crystallographic properties of Cu-In-Se thin films were identified by X-ray diffractometer (XRD), the surface and cross-sectional morphology of films were observed by scanning electron microscopy (SEM). The chemical compositions of films were characterized by energy dispersive spectroscopy (EDS). It was found that the thickness of Cu-In films deposited on molybdenum-coated soda lime glass were approximately 1 μm. The EDS analysis showed the composition ratio in atomic % of Cu/In as approximately as 0.77. The XRD results reveal that the as-deposited Cu-In films consist of a mixture of copper oxide (CuO) and indium oxide (In2O3) phase at the annealing temperature of 500°C. Furthermore, CuO and In2O3 phase were converted to (112) oriented chalcopyrite copper indium diselenide after selenization process.
Head Instability Detection for Testing Process in Perpendicular Magnetic Recording System
Authors: Kovintavewat Piya , Koonkarnkhai Santi , Suvichakorn Aimamorn
Published: September 2013

During hard disk drive (HDD) testing process, the magneto-resistive read (MR) head is analyzed and checked if the head is defective or not. Baseline popping (BLP) is one of the crucial problems caused by head instability, whose effect can distort the readback signal to the extent of causing possible sector read failure. Without BLP detection algorithm, the defective read head might pass through HDD assembling process, thus producing an unreliable HDD. This situation must be prevented so as to retain customer satisfaction. This paper proposes a simple (but efficient) BLP detection algorithm for perpendicular magnetic recording systems. Results show that the proposed algorithm outperforms the conventional one in terms of both the percentage of detection and the percentage of false alarm, when operating at high signal-to-noise ratio.
Enhanced Photocatalytic Activities of Ag/ZnO Powders Modified by Diblock Copolymer
Authors: Amornpitoksuk Pongsaton , Suwanboon Sumetha , Muensit Nantakan , Baltrusaitis Jonas
Published: September 2013

Ag/ZnO powders were synthesized through a precipitation method, using poly(ethylene oxide)-block-poly(propylene oxide) as stabilizer. X-ray diffraction patterns of all prepared powders showed a mixed phase of Ag and ZnO. The existence of metallic Ag on the surface of all prepared ZnO powders was confirmed by X-ray photoelectron spectroscopy. Their photocatalytic activities were investigated through the degradation of a methylene blue solution under blacklight illumination. The Ag/ZnO prepared from the Zn2+ solution containing 7 mol% of Ag+ had the highest photocatalytic activity and this also showed better photocatalytic activity than a commercial ZnO powder.
Angular Distribution of Multiple Compton Scattered Gamma Rays in Carbon
Authors: Siengsanoh Kittipong , Limkitjaroenporn Pruittipol , Limsuwan Pichet , Chewpraditkul Weerapong , Kaewkhao Jakrapong
Published: September 2013

This work studied the angular distribution of multiple Compton scattering of gamma energy 662 keV, obtained from 137Cs source. The gamma rays are incident on carbon scatterer of varying the scattering angles. The phenomenon of multiple Compton scattering has been successfully observed using NaI(Tl) scintillation detector. The energy spectra of the detected photons are observed as a long tail to the single-photon Compton line on the lower side of the full-energy peak in the recorded scattered energy spectrum. The full-energy peak corresponding to singly scattered events is reconstructed analytically and observe that the number of multiply scattered events, having same energy as in the singly scattered distribution.