نتایج جستجو برای: variable intercooler effectiveness

تعداد نتایج: 574791  

Ali Sarreshtehdari Mahmoud Chahartaghi, Sayed Ehsan Alavi,

During hot seasons the inlet temperature of Nitrogen increases, as a result compressor consumes more power for compressing a specific mass ratio of fluid and consequently total energy consumption of the compressor increases as well. In this research, a three stage centrifugal compressor with intercooler was modeled thermodynamically in order to decreases the energy consumption of the compressor...

this thesis attempts to investigate the effects of prelistening activities on enhancing iranian efl learners` listening comprehension. the present study investigated ways in which learners` background knowledge could be activated in order to enhance their l2 listening comprehension by limiting the number of possible text interpretations prior to listening. the experiments conducted in this study examined the effect of prior knowledge and vocabulary teaching on iranian efl learners listening comprehension. the current study has two purposes: one is to investigate the effect of background knowledge on the second language listening comprehension of iranian intermediates and the other is to determine whether second language is facilitated by the introduction of unknown vocabularies in the form of prelistening activities. to conduct the study different instruments such as listening proficiency test and four listening tests such as pre and posttests were used and various statistical processes and techniques including paired-sample t-test, and analysis of variance (anova) were used. the findings of this study supported all three hypotheses tested. differences were found between the means of preteaching vocabulary variable, the background knowledge activation variable, and mean difference between these two strategies variable. subjects scored higher when the unknown words were taught in advance. likewise, subjects scored higher when they were asked some relevant questions about the topic than on those without them. there was, in addition, a significant difference between the means of preteaching vocabulary strategy and background knowledge activation strategy. in fact, preteaching vocabulary had a better effect in enhancing the students’ listening comprehension, in comparison to background knowledge activation strategy.

پایان نامه :دانشگاه آزاد اسلامی - دانشگاه آزاد اسلامی واحد تهران مرکزی - دانشکده زبانهای خارجی 1390

this thesis attempts to investigate the effects of prelistening activities on enhancing iranian efl learners` listening comprehension. the present study investigated ways in which learners` background knowledge could be activated in order to enhance their l2 listening comprehension by limiting the number of possible text interpretations prior to listening. the experiments conducted in this stud...

Journal: :مدیریت دولتی 0
محسن امیدیان کارشناس‎ارشد مدیریت منابع انسانی، دانشگاه تهران، تهران، ایران غلامرضا طالقانی استاد گروه مدیریت دولتی، دانشکده مدیریت، دانشگاه تهران فرشته محمدی دانشجوی دکتری مدیریت دولتی گرایش مدیریت منابع انسانی، دانشگاه تهران، تهران، ایران جمال فیروزی دانشجوی کارشناسی ارشد مدیریت منابع انسانی، دانشگاه تهران، تهران، ایران حمیدرضا یعقوبی کارشناس‎ارشد مدیریت فناوری اطلاعات، دانشگاه تهران، تهران، ایران حمزه خواستار استادیار دانشکدۀ مدیریت، دانشگاه خوارزمی، تهران، ایران

recent study examines the impact of good governance on the human development index. in the present study, the human development index (hdi) considered as dependent variable, good governance is independent variables and the development of communication technology has been considered as the moderator variable. the study approach is econometric panel data analysis and gls regression analysis was u...

Journal: :E3S web of conferences 2022

In this paper, the engine-in-the-loop (EIL) methodology was used to study real driving emissions of a heavy-duty vehicle on an engine test bed. The virtual combined with actual establish EIL platform. result speed followability shows that difference between simulated and is within ±2 km/h, indicating cycle can be well reproduced bed by method. method high coincidence operating points. Compared ...

Journal: :International journal of automotive science and technology 2021

In the rapidly developing automotive technology, efforts to achieve high performance with less fuel consumption is one of most important issues today. The purpose supercharged systems developed for this reason send more air into cylinder. For engine and low exhaust emission values, intake temperature, which heated in turbo-compressor has oxygen concentration (the amount unit air) decreased, mus...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید