نتایج جستجو برای: the earths magnetic field

تعداد نتایج: 16220343  

2009
Ji-Lin Zhou

Hot super-Earths are exoplanets with masses ≤ 10M⊕ and orbital periods≤ 20 days. Around 8 hot super-Earths have been discovered in the neighborhood of solar system. In this lecture, we review the mechanisms for the formation of hot super-Earths, dynamical effects that play important roles in sculpting the architecture of the multiple planetary systems. Two example systems (HD 40307 and GJ 436) ...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه علامه طباطبایی 1390

over the past decades a number of approaches have been applied for forecasting mortality. in 1992, a new method for long-run forecast of the level and age pattern of mortality was published by lee and carter. this method was welcomed by many authors so it was extended through a wider class of generalized, parametric and nonlinear model. this model represents one of the most influential recent d...

ژورنال: سلامت کار ایران 2015
امکانی, مجتبی, جلیلیان, حامد, حدادی, محسن, ذاکریان, سید ابوالفضل, منظم, محمد رضا, نجفی, کامران ,

Background and aims: Extremely low frequency magnetic field (ELF) is part of Spectrum of electromagnetic waves with range 30 to 300 Hz. The average magnetic field exposures in the workplace have been found to be higher in “electrical occupations” than in other occupations such as office work. The interaction between magnetic fields produced by power lines and substations with living organisms a...

Agar/Fe3O4 nanocomposites were synthesized in the presence of an external magnetic field (~ 0.4 Tesla) and their characteristics were compared with the samples synthesized without considering the external magnetic field. In this study we used Fe2+ and Fe3+ for synthesizing Fe3O4 magnetic nanoparticles in the presence of agar as polymeric additive, by co-precipitation technique. Vibrating sample...

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

چکیده : آرای صادره از دادگاه ها علاوه بر شیوه های عادی از طریق فوق العاده نیز قابل اعتراض و رسیدگی مجدد هستند. در مواقعی که رای دادگاه مخل به حقوق ثالث باشد وی می تواند به ان اعتراض کند. قلمرو شمول اعتراض ثالث به تصمیمات قضایی که از آن به رای تعبیر شده محدود می گردد. ولی در مورد قرارها که به اعدادی و نهایی تفکیک می شوند، چون هیچ رویه ثابت و مشخصی در این زمینه در دادگاهها وجود نداشته و همچنین ا...

In this article, the second quantization method has been used to investigate some thermodynamic properties of spin-polarized metallic nanowire in the presence of magnetic field at zero temperature. We have been observed that in different magnetic field, the equilibrium energy of system increases as the density increases. The spin-polarization parameter corresponding to the equilibrium state of ...

Magnetic field  improved germination parameters. The germination of Catharanthus roseus seeds is lost under salinity conditions. The effect of different strengths of magnetic field and exposure durations on the germination of C. roseus seeds under salinity conditions (19 mS cm-1) were investigated. The experiment was conducted  with factorial arrangement based on a completely randomized design ...

Journal: :reports of biochemistry and molecular biology 0
sophia mousavian science and research branch, islamic azad university, neishabour, iran. ali makhdoumi-kakhki tel: +98 51 38797022; fax: +98 51 38797022

this study was intended to investigate the effectiveness of static magnetic field on the growth of escherichia coli (e. coli) provided from two sources, the urine samples of patients with urinary tract infections and the reference strain e. coli atcc 25922. bacterial samples in nutrient broth were subjected to a range of magnetic intensities (2, 4, 6, 9, 14, 16, 18, and 20 mt) at various exposu...

Journal: :محیط شناسی 0
مرضیه فاتحی کارشناس ارشد مهندسی شیمی- گرایش محیط زیست، دانشکدۀ فنی- مهندسی، دانشگاه شهید باهنر کرمان سید احمد عطائی استادیار مهندسی شیمی، دانشکدۀ فنی- مهندسی، دانشگاه شهید باهنر کرمان

polyhydroxyalkanoates (phas) are naturally occurring polyester that can be accumulated in bacterial cells as a carbon and energy storage compound. they are metabolized by many microorganisms. these biopolymers accumulate in microbial cells under stress conditions such as limitation of nitrogen, phosphate, sulfur, oxygen, and excess carbon source. currently, phas have attracted increasing intere...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شیخ بهایی - دانشکده زبانهای خارجی 1391

simplification universal as a universal feature of translation means translated texts tend to use simpler language than original texts in the same language and it can be critically investigated through common concepts: type/token ratio, lexical density, and mean sentence length. although steps have been taken to test this hypothesis in various text types in different linguistic communities, in ...

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