Perspectives in science最新文献_第7页

Diagnosis of airgap eccentricity fault in the inverter driven induction motor drives by transformative techniques 用变换技术诊断变频异步电动机气隙偏心故障

Perspectives in science Pub Date : 2016-09-01 DOI: 10.1016/j.pisc.2016.04.014

Khadim Moin Siddiqui , Kuldeep Sahay , V.K. Giri , Narendra Gothwal

{"title":"Diagnosis of airgap eccentricity fault in the inverter driven induction motor drives by transformative techniques","authors":"Khadim Moin Siddiqui , Kuldeep Sahay , V.K. Giri , Narendra Gothwal","doi":"10.1016/j.pisc.2016.04.014","DOIUrl":"10.1016/j.pisc.2016.04.014","url":null,"abstract":"<div><p>In the present paper, the airgap eccentricity fault of the induction motor has been diagnosed by digital signal processing transformative techniques in the inverter driven induction motor drives. The airgap eccentricity fault has been diagnosed in the transient condition by time domain as well as time-frequency domain techniques with the help of a proposed dynamic simulation model. In the past, many signal processing techniques had been used for various induction motor fault detection purpose such as fast Fourier transform, Hilbert transform, short term Fourier transform, etc. But, all techniques faced some sort of disadvantages. Therefore, in this paper, all shortcomings of the previous used signal processing techniques have been solved by newly wavelet transform's approximation signal. The low frequency approximation signal has been used to diagnose the eccentricity fault in the transient condition. Therefore, early fault diagnosis of the motor is possible and averted the motor before reaching in the ruinous conditions. As a result, the industries may save large revenues and unexpected failure conditions. The obtained results clearly demonstrate that the developed diagnostic technique may reliably separate airgap eccentricity fault in many stages.</p></div>","PeriodicalId":92112,"journal":{"name":"Perspectives in science","volume":"8 ","pages":"Pages 127-131"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.pisc.2016.04.014","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90055469","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10

Static economic dispatch incorporating wind farm using Flower pollination algorithm 基于花授粉算法的风电场静态经济调度

Perspectives in science Pub Date : 2016-09-01 DOI: 10.1016/j.pisc.2016.04.045

Suresh Velamuri, Sreejith S, Ponnambalam P

引用次数: 28

Design and development of semantic web-based system for computer science domain-specific information retrieval 基于语义的计算机科学领域信息检索系统的设计与开发

Perspectives in science Pub Date : 2016-09-01 DOI: 10.1016/j.pisc.2016.04.067

Ritika Bansal, Sonal Chawla

{"title":"Design and development of semantic web-based system for computer science domain-specific information retrieval","authors":"Ritika Bansal, Sonal Chawla","doi":"10.1016/j.pisc.2016.04.067","DOIUrl":"10.1016/j.pisc.2016.04.067","url":null,"abstract":"<div><p>In semantic web-based system, the concept of ontology is used to search results by contextual meaning of input query instead of keyword matching. From the research literature, there seems to be a need for a tool which can provide an easy interface for complex queries in natural language that can retrieve the domain-specific information from the ontology. This research paper proposes an IRSCSD system (Information retrieval system for computer science domain) as a solution. This system offers advanced querying and browsing of structured data with search results automatically aggregated and rendered directly in a consistent user-interface, thus reducing the manual effort of users. So, the main objective of this research is design and development of semantic web-based system for integrating ontology towards domain-specific retrieval support. Methodology followed is a piecemeal research which involves the following stages. First Stage involves the designing of framework for semantic web-based system. Second stage builds the prototype for the framework using Protégé tool. Third Stage deals with the natural language query conversion into SPARQL query language using Python-based QUEPY framework. Fourth Stage involves firing of converted SPARQL queries to the ontology through Apache's Jena API to fetch the results. Lastly, evaluation of the prototype has been done in order to ensure its efficiency and usability. Thus, this research paper throws light on framework development for semantic web-based system that assists in efficient retrieval of domain-specific information, natural language query interpretation into semantic web language, creation of domain-specific ontology and its mapping with related ontology. This research paper also provides approaches and metrics for ontology evaluation on prototype ontology developed to study the performance based on accessibility of required domain-related information.</p></div>","PeriodicalId":92112,"journal":{"name":"Perspectives in science","volume":"8 ","pages":"Pages 330-333"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.pisc.2016.04.067","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76335908","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 13

Iron oxide nanoparticles synthesis through a benign approach and its catalytic application 纳米氧化铁的良性合成及其催化应用

Perspectives in science Pub Date : 2016-09-01 DOI: 10.1016/j.pisc.2016.04.054

Henam Sylvia Devi, Thiyam David Singh

{"title":"Iron oxide nanoparticles synthesis through a benign approach and its catalytic application","authors":"Henam Sylvia Devi, Thiyam David Singh","doi":"10.1016/j.pisc.2016.04.054","DOIUrl":"10.1016/j.pisc.2016.04.054","url":null,"abstract":"<div><p>Synthesis of iron oxide nanoparticles was carried out through an environmental benign route using tannic acid as reducing and capping agent. The TEM image shows the details of the poly-dispersity in size of the iron oxide nanoparticle and average diameter of the particles range in between 30 and 50nm. XRD result rule out that iron oxide nanoparticle is a mixed phase constituted by Fe<sup>+2</sup> and Fe<sup>+3</sup> ions. The average size of the particle determined from XRD data is 45.6nm which is agreeable with the finding obtained from TEM images. This particle of iron oxide is used for the degradation of p-cresol and it successfully degraded p-cresol. Catalytic property of the iron oxide nanoparticle was also investigation using methylene blue as role model dye. Degradation of methylene blue dye was studied in presence of NaBH<sub>4</sub> and the degradation reaction followed first order kinetics with rate constant value of 1.6×10<sup>−3</sup>   min<sup>−1</sup>, this result confirmed the catalytic nature of as such prepared iron oxide nanoparticles.</p></div>","PeriodicalId":92112,"journal":{"name":"Perspectives in science","volume":"8 ","pages":"Pages 287-289"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.pisc.2016.04.054","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82763703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 11

Enervate carrier LS-PWM for reducing harmonic distortions in SCHB-MLI 用于降低SCHB-MLI中谐波畸变的弱载波LS-PWM

Perspectives in science Pub Date : 2016-09-01 DOI: 10.1016/j.pisc.2016.03.005

Rohith Balaji Jonnala , Ch Sai Babu

引用次数: 2

A comparison study for control and stabilisation of inverted pendulum on inclined surface (IPIS) using PID and fuzzy controllers 采用PID和模糊控制器对斜面倒立摆的控制与稳定进行了比较研究

Perspectives in science Pub Date : 2016-09-01 DOI: 10.1016/j.pisc.2016.03.016

Ashwani Kharola, Pravin Patil, Suyashi Raiwani, Deepak Rajput

引用次数: 30

Mass market development strategies of software industries: Case study based research 软件产业的大众市场开发策略:基于案例的研究

Perspectives in science Pub Date : 2016-09-01 DOI: 10.1016/j.pisc.2016.04.006

Varun Gupta , Kamlesh Dutta , Durg Singh Chauhan

{"title":"Mass market development strategies of software industries: Case study based research","authors":"Varun Gupta , Kamlesh Dutta , Durg Singh Chauhan","doi":"10.1016/j.pisc.2016.04.006","DOIUrl":"10.1016/j.pisc.2016.04.006","url":null,"abstract":"<div><p>The success in competitive mass market software development depends on the quality of software development and market segments targeted. Market segments are categorized by uncertainties contributed by “Newness” and “turbulences”, making the software success stochastic in nature. Selecting good market segments, delivering high quality software versions in the lowest time than competitors, result in increasing demand in markets and ultimately revenues. Enhanced customer base is beneficial for current product as well as for future products of industry in the form of increased reputation and increased involvement of customers in future development. The case study was conducted with 13 representatives drawing experiences of 14 mass market projects. Results indicate that software solutions are delivered to few investors or in highly competitive markets, as per the survey's findings of the marketing departments. The software organizations are reluctant to deliver relatively complex solutions in new markets unless and until strongly convinced with the probable success. The method for selection of market segments belonging to new and existing markets for undertaking the software delivery is also proposed in this paper. The model will help software industry decide the market segments and high abstract level features that could increase probability of software success. Poor selection of markets or targeting markets of “improper” size affects the market share of the industry to a great extend.</p></div>","PeriodicalId":92112,"journal":{"name":"Perspectives in science","volume":"8 ","pages":"Pages 96-100"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.pisc.2016.04.006","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90817058","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Large Eddy Simulation of isothermal cruciform jet flow: Preliminary results 等温十字射流大涡模拟:初步结果

Perspectives in science Pub Date : 2016-09-01 DOI: 10.1016/j.pisc.2016.01.003

B.T. Kannan , P. Ssheshan , Sundararaj Senthilkumar

{"title":"Large Eddy Simulation of isothermal cruciform jet flow: Preliminary results","authors":"B.T. Kannan , P. Ssheshan , Sundararaj Senthilkumar","doi":"10.1016/j.pisc.2016.01.003","DOIUrl":"10.1016/j.pisc.2016.01.003","url":null,"abstract":"<div><p>The present work is a numerical study of a turbulent isothermal jet issuing from cruciform nozzle into still air at a high Reynolds number of 1.7×10<sup>5</sup>. The numerical simulation was carried out by using open source CFD tool OpenFOAM<sup>®</sup>. Three-dimensional cuboid shaped domain was used to simulate the unsteady turbulent flow field. The simulation was carried out by solving the filtered Navier–Stokes equations along with Smagorinsky sub-grid scale model. The Large Eddy Simulation (LES) solutions are compared with experimental data for validation of the jet flow physics. The flow field of turbulent jet from cruciform nozzle are described in terms of inverse mean axial velocity decay and visualizations. The vortical structures are visualized using iso-surface contours of vorticity magnitude. The vortical structures develop from the cruciform nozzle is significantly different from axisymmetric nozzles. The vortical structures show changes in shape as they move downstream from the nozzle. The cruciform jet shows complex vorticity dynamics in the near field region.</p></div>","PeriodicalId":92112,"journal":{"name":"Perspectives in science","volume":"8 ","pages":"Pages 10-12"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.pisc.2016.01.003","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86369196","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Inhibitory action of dextran on the corrosion of 6061Al–15%(v) SiC(P) composite in HCl medium 右旋糖酐对6061Al-15% (v) SiC(P)复合材料在HCl介质中的腐蚀抑制作用

Perspectives in science Pub Date : 2016-09-01 DOI: 10.1016/j.pisc.2016.04.026

B.P. Charitha, Padmalatha Rao

引用次数: 3

MRAS speed estimator with fuzzy and PI stator resistance adaptation for sensorless induction motor drives using RT-lab MRAS速度估计与模糊和PI定子电阻自适应无传感器感应电机驱动使用RT-lab

Perspectives in science Pub Date : 2016-09-01 DOI: 10.1016/j.pisc.2016.04.013

S. Mohan Krishna, J.L. Febin Daya

{"title":"MRAS speed estimator with fuzzy and PI stator resistance adaptation for sensorless induction motor drives using RT-lab","authors":"S. Mohan Krishna, J.L. Febin Daya","doi":"10.1016/j.pisc.2016.04.013","DOIUrl":"10.1016/j.pisc.2016.04.013","url":null,"abstract":"<div><p>This paper presents a real-time simulation study of Model Reference Adaptive System based rotor speed estimator with parallel stator resistance adaptation mechanism for speed sensorless induction motor drive. Both, the traditional Proportional Integral and Fuzzy logic based control mechanisms are utilised for stator resistance adaptation, while, the rotor speed is estimated parallely by means of Proportional Integral based mechanism. The estimator's response to dynamic changes in Load perturbation and doubling of the nominal value of the actual stator resistance of the motor is observed. The superiority of the fuzzy based stator resistance adaptation in the Model Reference Adaptive System estimator is proved through results validated in real-time. The purpose of employing a fairly new real-time platform is to reduce the test and prototype time. The model is initially built using Matlab/Simulink blocksets and the results are validated in real time using RT-Lab. The RT-lab blocksets are integrated into the Simulink model and then executed in real-time using the OP-4500 target developed by Opal-RT. The real-time simulation results are observed in the workstation.</p></div>","PeriodicalId":92112,"journal":{"name":"Perspectives in science","volume":"8 ","pages":"Pages 121-126"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.pisc.2016.04.013","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81042422","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 30