نتایج جستجو برای: speed factor

تعداد نتایج: 1038602  

Journal: :international journal of smart electrical engineering 2014
mehrnaz fardamiri seyed zeinolabedin moussavi

in recent years, there has been a fast growth in wind energy conversion system (wecs). there are two general types of wind turbines in wecs: fixed speed wind turbines and varying speed wind turbines.permanent magnet synchronous generator (pmsg) is one of the most attractive generators for the varying speed turbine wecs.in this paper, a fuzzy controller is proposed to control the current source ...

Journal: :Oper. Res. Lett. 2015
Martin Groß Martin Skutella

Multi-commodity flows over time exhibit the non-intuitive property that letting flow wait can allow us to send flow faster overall. Fleischer and Skutella (IPCO 2002) show that the speed-up through storage is at most a factor of 2, and that there are instances where the speed-up is as large as a factor of 4/3. We close this gap by presenting a family of instances for which the speed-up factor t...

Journal: :رشد و یادگیری حرکتی - ورزشی 0
علی فتحی زاده دانشجوی دکتری، رفتارحرکتی، دانشکدۀ تربیت بدنی، دانشگاه فردوسی مشهد، ایران پرهام سیستانی کارشناس ارشد، مدیریت ورزشی، دانشگاه آزاد اسلامی هرمزگان، بندرعباس، ایران احمد ترک فر استادیار، مدیریت ورزشی، دانشگاه آزاد اسلامی، واحد شیراز، ایران حسن محمدزاده دانشیار، رفتارحرکتی، دانشکدۀ ادبیات، دانشگاه ارومیه، ایران

a motor task performance and imagery show several parallel characteristics. in this study, the effect of a voluntary speed change in mental images of a complex difficult sequence of karate techniques on subsequent motor performance was assessed. 24 male karate volunteers (mean age: 24.58±5.27 years) who were well skilled at performing the sequence movements participated in the pretest. during t...

Journal: Polyolefins Journal 2021

Polyolefins have been widely used in the electrical insulation and cable industry in recent years. One of the main usages of these materials is dielectric insulation in coaxial cables. Low attenuation and high signal transmission speed are among the desired features in coaxial cables. The role of polyethylene foam on signal transmission speed in the coaxial cables is the main focus of this stud...

Journal: :iranian journal of mechanical engineering transactions of the isme 2013
r. bagheri m. ayatollahi o. rahmani

the problem of several finite moving cracks in a functionally graded material is solved by dislocation technique under the condition of anti-plane deformation. by using the fourier transform the stress fields are obtained for a functionallygraded strip containing a screw dislocation. the stress components reveal the familiar cauchy singularity at thelocation of dislocation. the solution is empl...

Journal: :Archives of clinical neuropsychology : the official journal of the National Academy of Neuropsychologists 2013
Philip Schatz Arthur Maerlender

We present the initial validation of a two-factor structure of Immediate Post-Concussion Assessment and Cognitive Testing (ImPACT) using ImPACT composite scores and document the reliability and validity of this factor structure. Factor analyses were conducted for baseline (N = 21,537) and post-concussion (N = 560) data, yielding "Memory" (Verbal and Visual) and "Speed" (Visual Motor Speed and R...

This study investigated the optimization of three welding parameters (wire feed speed, arc voltage, and shielding gas flow rate) for SS 304H by using Taguchi based Grey relational analysis. In this research work, pure argon was used as shielding gas. Numbers of trials were performed as per L16 (4xx3) orthogonal array design and the mechanical quality such ultimate tensile strength, microhardnes...

ژورنال: آبخیزداری ایران 2022

Today, the use of data recorded in synoptic stations of the country is one of the most significant sources of applied research for researchers. Data recorded automatically or manually at synoptic, climatological, and other stations are analyzed for statistical analysis. In this research, the data recorded in the synoptic stations of Iran, which are used to determine the days of dust, were analy...

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