توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱THE COALESCENCE OF TWO STAITIONARY DROPLETS: A NUMERICAL APPROACH
اطلاعات انتشار: پانزدهمین کنفرانس دینامیک شاره ها (سیالات)، سال
تعداد صفحات: ۱۰
In this paper the three dimensional coalescence of two stationary head–on droplets withequal diameters are numerically investigated. The Navier–Stockes equations are solved inconjunction with the Volume of Fluid (VOF) method to track the free surface of the droplets.Furthermore, surface tension is added to the Navier–Stokes equations as the only body forcecausing the coalescence phenomenon. Water droplets are considered to have a sphericalshape with a specified gap size between their free surfaces. It is found that the coalescence ofstationary droplets driven by surface tension is due to the pressure variation in theirsurrounding fluid. It is also shown that for the coalescence to occur, the gap size has to beless than a certain limit called critical gap size. Finally, the effects of important parametersincluding surface tension and viscosity of surrounding gas on the critical gap size are studied.The results show that increasing the surface tension value increases the critical gap size. Incontrast, increasing the kinematic viscosity of surrounding gas decreases the critical gap size.<\div>

۲Iran and the security of Afghanistan after NATO's pullout
نویسنده(ها):
اطلاعات انتشار: Summer ۲۰۱۲ - No. ۱۰، سال
تعداد صفحات: ۲۶
Security is the main concern or raison d'être of any state. The Islamic republic of Iran and the west have had common geopolitical concerns، with some convergence in Afghanistan. The first security priority of the U.S. in particular and Europe in general after the September 11 events has been coping with terrorism in its heartland، i.e. Afghanistan. This paper، after a short review of Iran's historical relations with Afghanistan as well as its geopolitical importance for Tehran، examines Iran's main security concerns stemming from Afghanistan and the consequent Iranian narration of those threats in the post–9\11 era. The article argues that Iranian policy and even ideals for Afghanistan's long–term security is similar to the Iraqi model: outright withdrawal of foreign troops and national self–reliance on security issues. Therefore، Iran welcomes NATO's drawback from Afghanistan in 2014 and implicitly cooperates with the west in Afghanistan for viable and indigenous security.
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