نتایج جستجو برای: wave and s

تعداد نتایج: 16965331  

Journal: :journal of optoelectronical nano structures 0
marjan jafari imam khomeini international university, qazvin, iran

we describe how to obtain electronic transport properties of disordered graphene, including the tight binding model and nearest neighbor hopping. we present a new method for computing, electronic transport wave function and greens function of the disordered graphene. in this method, based on the small rectangular approximation, break up the potential barriers in to small parts. then using the f...

Journal: :فیزیک زمین و فضا 0
مهدی ماهری پیرو دانشگاه تحصیلات تکمیلی علوم پایه زنجان عبدالرضا قدس دانشگاه تحصیلات تکمیلی علوم پایه زنجان مجید عباسی بخش مهندسی نقشه برداری، دانشگاه زنجان

we usewe use ml shear wave velocity to derive a high resolution 2d ml shear wave velocity map for the iranian plateau. the ml amplitudes and arrival times are routinely measured for the calculation of local magnitude. ml shear wave velocity is very sensitive to the lateral change of crustal thickness and switches between the velocity of lg and sn waves. an lg wave will die out as soon as encoun...

1999
Salam Tawfiq

Single pion transitions of S wave to S wave, P wave to S wave and P wave to P wave heavy baryons are analyzed in the framework of the Heavy Quark Symmetry limit (HQS). We then use a constituent quark model picture for the light diquark system with an underlying SU(2Nf ) ⊗ O(3) symmetry to reduce the number of the HQS coupling factors required to describe these transitions. A single constituent ...

Journal: :Geophysical Research Letters 2001

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه علامه طباطبایی - دانشکده ادبیات و زبانهای خارجی 1389

within the components of communicative competence, a special emphasis is put on the “rules of politeness,” specifically the politeness strategies (brown and levinson, 1978) that speakers deploy when performing the request speech act. this is because the degree of imposition that making a request places upon one’s interlocutor(s) has been seen to be influenced by several factors among which, as ...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه مازندران - دانشکده علوم انسانی و اجتماعی 1388

abstract the present study was conducted to examine the effect of proficiency on students interaction while carrying out the grammar-based task(s) in collaboration. in particular, the study examines whether the level of proficiency affects the learners’ focus of attention to grammatical and lexical features. the study takes a further step and examines whether there is any difference in the use...

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