Perspectives in science最新文献_第8页

Performance and Emission of VCR-CI Engine with palm kernel and eucalyptus blends 棕榈仁和桉树混合燃料VCR-CI发动机的性能和排放

Perspectives in science Pub Date : 2016-09-01 DOI: 10.1016/j.pisc.2016.04.030

Srinivas kommana , Balu Naik Banoth , Kalyani Radha Kadavakollu

引用次数: 27

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

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

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

Focal point computation and homogeneous geometrical transformation for linear curves 线性曲线的焦点计算与齐次几何变换

Perspectives in science Pub Date : 2016-09-01 DOI: 10.1016/j.pisc.2016.01.006

E. Mamatha , C.S. Reddy , S. Krishna Anand

引用次数: 12

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

Interlinking feasibility of five river basins of Rajasthan in India 印度拉贾斯坦邦五个河流流域互联互通的可行性

Perspectives in science Pub Date : 2016-09-01 DOI: 10.1016/j.pisc.2016.04.002

Sunil Kumar Vyas , Gunwant Sharma , Y.P. Mathur , Vinay Chandwani

{"title":"Interlinking feasibility of five river basins of Rajasthan in India","authors":"Sunil Kumar Vyas , Gunwant Sharma , Y.P. Mathur , Vinay Chandwani","doi":"10.1016/j.pisc.2016.04.002","DOIUrl":"10.1016/j.pisc.2016.04.002","url":null,"abstract":"<div><p>The increasing population and large scale growth with the development of modern science and technology has indicated very high stress on water sector in Rajasthan in India. Availability of water and uniformity of rainfall distribution is changing day by day due to shifting of monsoon in Rajasthan. The spatial and temporal variations in the rainfall in different river basins in Rajasthan are drastic due to which flood situation arises in the tributaries of Chambal river basin every year. Simultaneously on the other hand drought situation arises in the other different places in the most of the river basins which are also under dark zone. In totality natural water resources are also limited in Rajasthan so there is an urgent need for its proper planning, development and management of the available water duly taking care of environmental, ecological, socio-economic aspects and their inter-relationships.</p><p>Annual surplus water of about 1437 MCM in the river Chambal is going waste and ultimately reaches to sea after creating flood situations in various places in India including Rajasthan, while on the other hand 1077 MCM water is a requirement in the four other basins in Rajasthan i.e. Banas, Banganga, Gambhir and Parbati at 75% dependability. Interlinking and water transfer from Chambal to these four river basins is the prime solution for which 372km link channel including 9km tunnel of design capacity of 300cumec with 64m lift is required.</p></div>","PeriodicalId":92112,"journal":{"name":"Perspectives in science","volume":"8 ","pages":"Pages 83-86"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.pisc.2016.04.002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90549898","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: 5

Investigation of microstructure and mechanical properties of Mg–Zn/Al multilayered composite developed by accumulative roll bonding 累积辊接法制备Mg-Zn /Al多层复合材料的显微组织与力学性能研究

Perspectives in science Pub Date : 2016-09-01 DOI: 10.1016/j.pisc.2016.04.008

Gajanan Anne , M.R. Ramesh , H. Shivananda Nayaka , Shashi Bhushan Arya

引用次数: 10

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

Compatibility issues of cement with water reducing admixture in concrete 水泥与混凝土减水剂的相容性问题

Perspectives in science Pub Date : 2016-09-01 DOI: 10.1016/j.pisc.2016.04.055

A.K. Shrivastava, Munendra Kumar

{"title":"Compatibility issues of cement with water reducing admixture in concrete","authors":"A.K. Shrivastava, Munendra Kumar","doi":"10.1016/j.pisc.2016.04.055","DOIUrl":"10.1016/j.pisc.2016.04.055","url":null,"abstract":"<div><p>Multiple brand of cement and water reducing admixtures are available in the market, even though these cements and admixture comply with the respective codal provisions there performance are not same in the concrete for each and every brand of cement and water reducing admixture, even if quality and source of other ingredients of concrete is kept same. This has created a lot of confusion among the user about what type/brand of admixture is used with what type/brand of cement and what should be optimum dose of admixture. Common problem associated with incompatibility issue is flash setting, delayed setting, rapid slump loss, improper strength gain and cracking, these not only effect the strength of the concrete but also the durability of the structure. Hence, in the present study different brand/type of cement and water reducing admixture available in the market is used to find study the compatibility issue and optimum dose of admixture. To achieve this marsh cone test has been performed. Test results indicate that the optimum dose of admixture vary from 0.9 to 1.1% of the weight of cement with different type/brand of cement and type/brand of admixture.</p></div>","PeriodicalId":92112,"journal":{"name":"Perspectives in science","volume":"8 ","pages":"Pages 290-292"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.pisc.2016.04.055","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85000212","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: 12