نتایج جستجو برای: پلاسمای rf

تعداد نتایج: 36246  

M Sheikhi, N Shokrpour P Mokarram S M J Mortazavi, S Saeb

Background: Over the past several years, the rapidly increasing use of mobile phones has raised global concerns about the biological effects of exposure to radiofrequency (RF) radiation. Numerous studies have shown that exposure to electromagnetic fields (EMFs) can be associated with effects on the nervous, endocrine, immune, cardiovascular, hematopoietic and ocular systems. In spite of genetic...

Trinidad has tar sand resources of about 2 billion barrels of oil on land in the Parrylands/Guapo and Brighton areas. With an oil price of over USD 25 per barrel, the commercial extraction of oil from Trinidad tar sands is viable, but it requires a careful study. The relatively small extent of this tar sand (about 10,000 acres and with depths varying from surface to less than 500 feet) and with...

The computation of structural failure probability is vital importance in the reliability analysis and may be carried out on the basis of the first-order reliability method using various mathematical iterative approaches such as Hasofer-Lind and Rackwitz-Fiessler (HL-RF). This method may not converge in complicated problems and nonlinear limit state functions, which usually shows itself in the f...

BJ Liu BN Zhang GF Qiao QM Liu YL Hou

Rhododendron dauricum L. is an ancient Chinese traditional herb. The pharmacological effects of R. dauricum extract have been shown in chronic tracheitis. The aim of this study was to investigate the cardiovascular effects of Rhododendron dauricum L. flavonoids (RF) on rats and its mechanisms. This study was performed in isolated vascular rings and a rat model of myocardial infarction and isola...

A. Ikinci Keles, C. Guven, E. Odaci, E. Taskin, F.M. Gur, H. Kaya, H.E. Gur, H.S. Erol, M.B. Halici, S. Timurkaan,

Background: Mobile phones as an electronic device which are emitting radiofrequency-electromagnetic field (RF-EMF). In this study was intend to determine the contingent effects of cell phone induced RF-EMF on testicular tissue in adolescence. Materials and Methods: Rats in the RF-EMF group were exposed to 900 MHz RF-EMF, while sham and control rats were not. After the completion of the test ste...

پایان نامه :دانشگاه آزاد اسلامی - دانشگاه آزاد اسلامی واحد تهران مرکزی - دانشکده علوم پایه 1392

در این پروژه(twt(traveling wave tube توسط پلاسمای سرد و یکنواخت پر شده است. داخل سیستم باریکه الکترونی توپر نسبیتی وجود دارد و کل سیستم در حضور میدان مغناطیسی است.طبق تئوری میدان خطی ، رابطه پاشندگی برای twt به دست می آید و سرعت فاز و نرخ رشد آن بررسی می شود. twtیک دستگاه مهم میکروموج توان بالا است که در 20 سال اخیر توسعه یافته است ودر رادارها و کاربردهای نظامی استفاده می شود. ساختار موج آرام ت...

2016
Alyssa Bell

University of Pittsburgh, Swanson School of Engineering Submission Date 11.01.2016 1 Disclaimer—This paper partially fulfills a writing requirement for first year (freshman) engineering students at the University of Pittsburgh Swanson School of Engineering. This paper is a student, not a professional, paper. This paper is based on publicly available information and may not provide complete anal...

2004
Hyokjae Choi Sangho Shin Kwyro Lee

Ab.mncr A 270hlHz frequency syntheuimrIFSK modulator for low-rate WPAN iu implemented. It consumes only 4.9mW adopting current re-using technique, self-DC biasing rcheme, and appropriate divider architecture. The 3'*-urder feedback l ~ p e DSM and the high performance charge pump are deigned for wide loop bandwidth, which enables lo design a low p w r r and low noise frequency syntherirer. The ...

2010
Miroslav M. Savić Samarpan Majumder Shengming Huang Rahul V. Edwankar Roman Furtmüller Srđan Joksimović Joachim Ramerstorfer Marija M. Milinković Bryan L. Roth Werner Sieghart James M. Cook

Novel positive allosteric modulators of GABAA receptors: Do subtle differences in activity at α1 plus α5 versus α2 plus α3 subunits account for dissimilarities in behavioral effects in rats? Miroslav M. Savić ⁎, Samarpan Majumder , Shengming Huang , Rahul V. Edwankar , Roman Furtmüller , Srđan Joksimović , Terry Clayton Sr. , Joachim Ramerstorfer , Marija M. Milinković , Bryan L. Roth , Werner ...

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