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Elastic Properties of Spark Plasma Sintered (SPS) ZrB₂/SiC-Sm₂Zr₂O₇ Composites

Elastic Properties of Spark Plasma Sintered (SPS) ZrB<sub>2<...

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7th China international conference on High-Performance Ceramics (CICC 7)

作者： Yan, Zhenyu Zhu, Shizhen Xu, Qiang Liu, Ying Beijing Inst Technol Beijing 100081 Peoples R China Natl Key Lab Sci & Technol Mat Under Shock & Impact Beijing Peoples R China

ISBN: (纸本)9783037854259;9783038138396

Due to extremely low oxygen transportation at elevated temperature, samarium zirconate (Sm2Zr2O7) with pyrochlore structure was introduced into ZrB2-based functional gradient composites as oxygen insulation. the elastic properties of composites with different phase ratio were investigated in this study. A series of nearly-fully dense ZrB2-based composites with different Sm2Zr2O7 content was consolidated by spark plasma sintering (SPS) technology. the microstructure and phase compositions were characterized by scanning electronic microscope and X-ray diffraction respectively. the dynamic elastic properties were obtained by resonance method at room temperature. the results revealed that the addition of Sm2Zr2O7 can significantly improve its densification for the refractory diboride, which mainly caused by the high sintering activity of Sm2Zr2O7. Young's modules of the series of composites obviously decreased with the increasing content of Sm2Zr2O7. the low Young's modulus of Sm2Zr2O7 was the main reason. the Young's modules of the series of composites were calculated theoretically. the experimental results matched the theoretical data well. A little deviation appeared due to the continuous structure of Sm2Zr2O7 in the composites.

关键词： Elastic property Samarium zirconate Zirconium Diboride SPS

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Shutdown reduction methods for compressors in condensate stabilization units

Shutdown reduction methods for compressors in condensate sta...

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IEEE international conference on System of Systems Engineering (SoSE)

作者： Elaheh Esfandiari Jahromi Leili Esmaeilani Salahedin Sadeghifard Alireza niknam Instrument Engineering Department Boushehr IRAN Instrumentation Department Boushehr IRAN

In this paper, the procedure of determination, analysis and rectification of repeatable trips causes of off-gas compressors located in condensate stabilization unit of South Pars Gas Complex 2nd refinery, that have instrumentation and control system sources, are presented. Besides decreasing of production rate and increasing acid gas flaring, each trip results serious and inevitable damages on environment, human health, equipments and their accessories in consequent. Significant reduction in number of trips has been achieved by finding proper solutions for all mentioned problems and applying needed modifications that could be listed as changes in temperature transmitter settings, changing the types of them, upgrading Human Machine Interface, addition of new signals to PLC software to be shown in monitoring system and DCS for enhanced trip analysis and also correction of some control system program parts such as determination of First out alarm. In addition the above cases; security enhancement in the monitoring system is much considerable.

关键词： Transmitters Compressors Monitoring Software Temperature sensors programming Instruments

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A requirement change management framework for distributed software environment

A requirement change management framework for distributed so...

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international conference on Computer Sciences and Convergence Information Technology (ICCIT)

作者： Yasir Hafeez Muhammad Riaz Sohail Asghar Hummera Naz Syed Mushhad Mustuzhar Gilani Asma Batool Mehmood Ahmed M. Shabbir Hassan Department of Computer Science & Software Engineering International Islamic University Islamabad Pakistan University Institute of Information Technology PMAS-Arid Agriculture University Rawalpindi Pakistan

ISBN: (纸本)9781467308946

Objective: In this research, we present a framework which has been introduced for improving the efficiency of requirement change management in GSD environment. Method: In this research, we have used structured, semi structured research methods gained through interviews from reputed organization experts. this research is based on published reports, articles, and existing case *** reviews are used to perform the evaluation of this model. Result: this has resulted in a framework for improving the effectiveness of requirement change management in GSD environment. Conclusion: the framework provides a guideline to the team of developers regarding how frequently changes could be incorporated.

关键词： GSD: Global Software Development RCM: Requirement Configuration Management DTS: Defect Tracking System CMS: Configuration Management System FR: functional Requirement NFR: Non functional Requirement change management Frameworks Professional personnel Distributed software GENETICALLY SIGNIFICANT DOSE Developers Environments Interviews

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Beyond Watson and Crick: programming DNA self-assembly for nanofabrication

Beyond Watson and Crick: Programming DNA self-assembly for n...

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IEEE international conference on Nano/Micro Engineered and Molecular Systems (NEMS)

作者： Paul W.K. Rothemund Department of Bioengineering California Institute of Technology USA

the specificity of Watson-Crick base-pairing allows great control over the design and synthesis of artificial DNA nanostructures. Periodic one-dimensional (1D) tubes, 2D lattices, and 3D crystals are easily created from “DNA tiles” with spacings of 10-20 nanometers. “DNA origami” allows the folding of long DNA strands into arbitrary shapes and patterns up to about 100 nanometers in size with five nanometer features. this suggests that DNA self-assembly might be used for sublithographic fabrication of devices or even circuits. there are, however, a number of challenges. For example, compared to the inorganic materials used as semiconductors, DNA has poor electronic properties and must be augmented by other materials. Such challenges must be solved before DNA self-assembly can be used in a complete process for nanofabrication. We will present partial solutions to a few of them.

关键词： DNA

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Tabu search based implementation of object tracking using joint color texture histogram

Tabu search based implementation of object tracking using jo...

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international conference on Industrial and Information Systems, ICIIS

作者： Bharath Kumar Koora Nitin R. Satpute Akshay Adiga EEE Department Birla Institute of Technology and Science Pilani Rajasthan India

Object tracking has many applications like security and surveillance, traffic control and many others. In this Paper new methodology has been proposed which uses tabu search algorithm along with joint color texture histogram to track object. Texture featurelike edges and corners are extracted using uniform linear binary pattern, which will help in increasing the robustness of the object to be tracked. After features are extracted battacharyya coefficient is calculated to measure similarity between target's raw feature in the previous frame and raw feature in present frame. this coefficient is used as objective function in tabu search algorithm framework. In tabu search, parameters like length of tabu list and radius of search region are chosen appropriately. the experimental results shows that the proposed algorithm can track object more robustly under complex scenario's like object is similar to background in a static video.

关键词： Feature extraction Target tracking Histograms Color Algorithm design and analysis Linear programming Search problems

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Fast Algorithms of Anisotropic Diffusion Filters for Parallel Processors

Fast Algorithms of Anisotropic Diffusion Filters for Paralle...

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international conference on Computing and Convergence Technology

作者： Hyun Kyu Kim Hyo Jong Lee Division of Computer Science and Engineering Chonbuk National University Jeonju Korea Division of Computer Science and Engineering Center for Advanced Image & Information Technology Chonbuk National University Jeonju Korea

ISBN: (纸本)9781467308946

A noise in digital image degrades the performance of image processing. these images are most often used in medical field for diagnosis and treatment. thus, there is a huge demand for high quality images from the medical field. the current algorithms to process useable images are derived using Gaussian blur filter. However, using such isotropic diffusion technique, the filter cuts away pertinent information within the image. the high noise level in an image will blur organs in medical images such as in MRI. In order to accommodate the loss of information while maintaining the quality of the image, an anisotropic diffusion filter has been developed. the anisotropic diffusion filter uses heat equation and the only downfall of the technique is lengthy process time. the purpose of this study is to decrease the processing time using parallel processors through the optimization of GPU.

关键词： Anisotropic Anisotropic diffusion filter GPU CUDA parallel programming multi-core

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Self-adaptive genetically programmed differential evolution

Self-adaptive genetically programmed differential evolution

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international conference on Electrical and Computer Engineering (ICECE)

作者： Pravakar Roy Md. Jahidul Islam Md. Monirul Islam Department of Computer Science and Engineering Bangladesh University of Engineering and Technology Dhaka Bangladesh

Differential evolution (DE) is a simple and efficient technique for real parameter optimization over continuous spaces. Its success is highly dependent on the choice of correct trial vector generation strategies and control parameters. Choosing appropriate trial vector generation strategies and control parameters for new problems by trial and error method can be computationally costly and inefficient. this paper proposes a hybrid approach, incorporating genetic programming (GP) with DE, where GP generates trial vector generation strategies based on the problem specification and the state of the population using a simple learning method. Trial vector generation strategies are chosen from this pool of strategies generated by GP. the choice of a particular strategy depends on the type of the problem, initialization values and state of evolution. Consequently, the strategies chosen for different run of the same problem are different. However, it allows self-adaptation to be completely problem dependent and as a result for a unknown problem domain the method is expected to perform better than other state-of-the-art self-adaptive evolutionary techniques. In this method, the control parameter F is eliminated and crossover ratio Cr is evolved with the population and population size NP is still fixed empirically. the performance of this method is extensively evaluated using the CEC2005 contest test instances. Experimental results show that, self-adaptive genetically programmed differential evolution (SaGPDE) leads to quick convergence and produce very competitive results.

关键词： Vectors Sociology Statistics Optimization Genetic programming Evolutionary computation Erbium

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Detection of multi-clustered genes and community structure for the plant pathogenic fungus Fusarium graminearum

Detection of multi-clustered genes and community structure f...

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10th international conference on Computational Methods in Systems Biology, CMSB 2012

作者： Bennett, Laura Lysenko, Artem Papageorgiou, Lazaros G. Urban, Martin Hammond-Kosack, Kim Rawlings, Chris Saqi, Mansoor Tsoka, Sophia Department of Informatics School of Natural and Mathematical Sciences King's College London Strand London WC2R 2LS United Kingdom Department of Computational and Systems Biology Rothamsted Research Harpenden Herts AL5 2JQ United Kingdom Centre for Process Systems Engineering Department of Chemical Engineering University College London Torrington Place London WC1E 7JE United Kingdom Department of Plant Biology and Crop Sciences Rothamsted Research Harpenden Herts AL5 2JQ United Kingdom

ISBN: (纸本)9783642336355

Exploring the community structure of biological networks can reveal the roles of individual genes in the context of the entire biological system, so as to understand the underlying mechanism of interaction. In this study we explore the disjoint and overlapping community structure of an integrated network for a major fungal pathogen of many cereal crops, Fusarium graminearum. the network was generated by combining sequence, protein interaction and co-expression data. We examine the functional characteristics of communities, the connectivity and multi-functionality of genes and explore the contribution of known virulence genes in community structure. Disjoint community structure is detected using a greedy agglomerative method based on modularity optimisation. the disjoint partition is then converted to a set of overlapping communities, where genes are allowed to belong to more than one community, through the application of a mathematical programming method. We show that genes that lie at the intersection of communities tend to be highly connected and multifunctional. Overall, we consider the topological and functional properties of proteins in the context of the community structure and try to make a connection between virulence genes and features of community structure. Such studies may have the potential to identify functionally important nodes and help to gain a better understanding of phenotypic features of a system. © 2012 Springer-Verlag.

关键词： Mathematical programming

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Power quality and reliability improvement of distribution system by optimal number, location and size of DGs using Particle Swarm Optimization

Power quality and reliability improvement of distribution sy...

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international conference on Industrial and Information Systems, ICIIS

作者： S. Chandrashekhar Reddy P. V. N. Prasad A. Jaya Laxmi Department of EEE Christu Jyoti Institute of Technology and Sciences Jangaon Andhra Pradesh India Department of EE University College of Engineering Osmania University Hyderabad India Department of EEE J.N.T.U.H College of Engineering J.N.T. University Hyderabad India

Distributed Generators (DGs) are now commonly used in distribution systems to reduce the power disruption in the power system network. Due to the installation of DGs in the system, the total power loss can be reduced and voltage profile of the buses and reliability of the system can be improved. the significant process to decrease the total power loss and to improve the power quality of the system is to identify the optimal number of DGs and their suitable locations in the system. To accomplish the aforementioned process and to evaluate the amount of power to be generated, a new method is proposed using Particle Swarm Optimization. the proposed method is tested for IEEE 30 bus system, by connecting optimal number of DGs in the system. the results showed a considerable reduction in the total power loss in the system and improved voltage profiles of the buses and reliability indices.

关键词： Reliability Power system reliability Joining processes Generators Linear programming Reactive power Training

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Reactive power and voltage control in grid connected wind farms

Reactive power and voltage control in grid connected wind fa...

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international conference on Industrial and Information Systems, ICIIS

作者： Pooja Sharma D. thukaram Electrical Department Indian Institute of Science Bangalore India

Wind power, as an alternative to fossil fuels, is plentiful, renewable, widely distributed, clean, produces no greenhouse gas emissions during operation, and uses little land. In operation, the overall cost per unit of energy produced is similar to the cost for new coal and natural gas installations. However, the stochastic behaviour of wind speeds leads to significant disharmony between wind energy production and electricity demand. Wind generation suffers from an intermittent characteristics due to the own diurnal and seasonal patterns of the wind behaviour. Both reactive power and voltage control are important under varying operating conditions of wind farm. To optimize reactive power flow and to keep voltages in limit, an optimization method is proposed in this paper. the objective proposed is minimization of the voltage deviations of the load buses (V desired ). the approach considers the reactive power limits of wind generators and co-ordinates the transformer taps. this algorithm has been tested under practically varying conditions simulated on a test system. the results are obtained on a system of 50-bus real life equivalent power network. the result shows the efficiency of the proposed method.

关键词： Generators Reactive power Wind power generation Optimization Sensitivity Linear programming Wind farms

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