نتایج جستجو برای: distribution of frequency
تعداد نتایج: 21222023 فیلتر نتایج به سال:
elastic energy of seismic wave is lost through propagation into the earth. various factors affect seismic energy. some of them are frequency independent and recovered in processing steps. but other factors such as intrinsic absorption of medium are frequency dependent and cannot be recovered by processing methods. lost energy caused by these factors is called attenuation. there are various meth...
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abstract variation of climatic elements could be estimated by standard deviation, coefficients of variation and so on. in iranian climatological literature, variations of climatic elements have main attention during last decades. meanwhile worldwide climatologist desired to study the characteristics of variations as well as the distribution of frequency average of these elements. in this paper,...
هدف: این مطالعه به منظور بررسی فراوانی دیابت در بیماران تالاسمی ماژور و ارتباط آن با فریتین سرم در مرکز پزشکی خاص تهران طی سال 1388 انجام شده است. روش مطالعه : این مطالعه به صورت یک بررسی توصیفی- تحلیلی مقطعی انجام شده است. حجم نمونه مورد بررسی در این مطالعه شامل 80 بیمار مبتلا به تالاسمی ماژور مراجعه کننده به مرکز پزشکی خاص تهران طی سال 1388 بود. یافته ها: 15 بیمار (8/18 درصد) دیابت داشتند....
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in this thesis, phosphorus ylides [phbppy], [no2bppy] and [brbppy] have been synthesized through the formation of phosphonium salt and dihydrogenation, followed by the reaction of pd(oac)2 and the orthopalladated dinuclear complexes [pd(?-cl)(phbppy)]2, [pd(?-cl)(no2bppy)]2 and [pd(?-cl)(brbppy)]2 have been produced. the reaction of dinuclear complexes and bidentate ligands [l = bipy (2,2-bipyr...
learning a second or foreign language requires the manipulation of four main skills, namely, listening, reading, speaking, and writing which lead to effective communication. it is obvious that vocabulary is an indispensible part of any communication, so without a vocabulary, no meaningful communication can take place and meaningful communication relies heavily on vocabulary. one fundamental fac...
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