نتایج جستجو برای: سال 87
تعداد نتایج: 206855 فیلتر نتایج به سال:
Context. Disentangling line-of-sight alignments of young stellar populations is crucial for observational studies star-forming complexes. This task particularly problematic in a Cygnus-X subregion where several components, located at different distances, overlap: the Berkeley 87 massive cluster, poorly known [DB2001] Cl05 embedded and ON2 complex, which turn composed H II regions. Aims. We prov...
مقدمه: تغذیه با شیر مادر و تغذیه تکمیلی نقش برجسته ای در رشد و تکامل کودک دارد. این پژوهش به منظور بررسی وضعیت تغذیه کودکان زیر دو سال در مناطق شهری و روستایی شهرستان جهرم انجام گرفت. روش کار: این پژوهش از نوع مقطعی و جامعه مورد مطالعه 435 نفر از کودکان با سن 18-24 ماه ساکن مناطق شهری و روستایی شهرستان جهرم بود. نمونه های پژوهش به روش نمونه گیری آسان انتخاب شدند. داده ها با استفاده از پرسش نامه...
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Magneto optical traps brilliantly combine semi-classical optics with modern physics. By carefully controlling the polarization and frequency of laser beams, it is possible to trap and cool atoms down to the millikelvin range at a relatively low cost. This has opened previously inaccessible physical domains to enterprising physicists all around the world, and is responsible for some of the most ...
In recent months I have come across many instances in which someone has found what they believe is a new result, in which they evaluate in closed form a sum involving binomial coefficients or factorials. In each case they have managed to do that either by using the recent powerful method of Wilf and Zeilberger (the W–Z method) [6], or by comparing coefficients in some ad hoc algebraic identity....
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