نتایج جستجو برای: phase system

تعداد نتایج: 2712096  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شیراز - دانشکده حقوق و علوم سیاسی 1390

چکیده : نظام انتخاباتی قواعد و چار چوب های به رسمیت شناخته شده ای است که بیانگر چگونگی تبدیل آرای مردم به مناصب و پست های سیاسی است. این نظام انتخابات باید به گونه ای عمل کند که نتیجه آن فراهم شدن مکانیسم و ساز و کار مطلوب و مناسب برای برگزاری انتخابات سالم و رقابتی باشد. به نظر می رسد نظام انتخاباتی جمهوری اسلامی ایران دارای ضعف ها و نواقصی است که به سبب آن ها نمی توان انتخابات مطلوب را برگزا...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی اصفهان 1389

run-out-table (rot) is located between last finishing stand and down coiler in a hot strip mill. as the hot steel strip passes from rot, water jets impact on it from top and bottom and strip temperature decreases approximately from 800-950 °c to 500-750°c. the temperature history that strip experience while passing through rot affects significantly the metallurgical and mechanical properties, s...

Journal: :iranian journal of science and technology transactions of electrical engineering 2015
g. khademi h. mohammadi m. dehghani

model order reduction is known as the problem of minimizing the -norm of the difference between the transfer function of the original system and the reduced one. in many papers, linear matrix inequality (lmi) approach is utilized to address the minimization problem. this paper deals with defining an extra matrix inequality constraint to guarantee that the minimum phase characteristic of the sys...

Journal: :asian journal of sports medicine 0
keyvan hejazi department of sport physiology, faculty of physical education and sport sciences, ferdowsi university of mashhad, mashhad, iran; paradise daneshgah, azadi square, faculty of physical education and sport sciences, ferdowsi university of mashhad, pobox: 1574, mashhad, iran. seyyed-reza attarzadeh hosseini faculty of physical education and sport sciences, ferdowsi university of mashhad, mashhad, iran

purpose the aim of this study was to compare the levels of serum immunoglobulin (iga, igm, igg), testosterone and cortisol in semi-endurance elite runners during general preparation and competition phase of training. methods thirteen semi-endurance elite male runners with an average age of 18.92±1.7 years volunteered to take part in this study. the runners participated in the selected training ...

Journal: :international journal of civil engineering 0
j. s. yi department of architectural engineering, ewha university,11-1 daehyun-dong, seodaemun-gu, seoul 120-750, south korea c. w. koo 9th fl., city air tower bldg.159-9, samsung-dong,gangnam-gu, seoul, korea 135-973 s. h. park 9th fl., city air tower bldg.159-9, samsung-dong, gangnam-gu, seoul, korea 135-973 o. k. kwon 9th fl., city air tower bldg.159-9, samsung-dong, gangnam-gu, seoul, korea 135-973

construction industry consists of several phases in which a variety of stakeholders are involved. as construction projects are becoming larger, more complex and more diverse, the design phase has been more important factor for the success of projects than ever before. however, it is considered that most of design work occurred in actual design process is intangible. such recognition makes the d...

Journal: :journal of artificial intelligence in electrical engineering 2012
mozhgan balavar

facts technology has considerable applications in power systems, such as; improving the steady stateperformance, damping the power system oscillations, controlling the power flow, and etc. statcom is oneof the most important facts devices used in the parallel compensation, enhancing transient stability andetc. since three phase fault is widespread in power systems, in this paper statcom is used...

Journal: :journal of sciences islamic republic of iran 0

the use of aqueous mixed micellar system consisting of sodium dodecyl sulfate (sds) and polyoxyethylene (23) dodecanol (brij-35) as the mobile phase in reversed-phase liquid chromatography was studied. a group of chlorophenols was used as the test mixture. adding organic modifier to the system showed that the use of low concentrations of organic additives improves efficiency in sds/brij-35 mixe...

Journal: :acta medica iranica 0
f. z. zangeneh f. motammedi a. bakhtiarian

the central cholinergic system has been associated with cognitive function and memory and acetylcholine plays an important role during the early stages of memory consolidation. in this study, after training mice were tested with one way active avoidance procedure and retention were tested at 4, 8, 12, 16 and 24 hours of training and compared with non-shocked mice, in which it took 24 hours, a s...

ژورنال: Journal of Railway Research 2018
Fazel, Seyed Saeed, Foiadelli, Federica, Jafari Kaleybar, Hamed, Madadi Kojabadi, Hossein, Brenna, Morris ,

Abstract Traditional railway power supply systems impose substantial power quality problems (PQ) on the utility network, such as unbalance, harmonics and a large amount of reactive power. This paper proposes a topology based on three-phase to single-phase modular multilevel converters (MMC) to obviate these problems. The MMC based traction substations (TSS) are connected directly to the utili...

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