نتایج جستجو برای: two zones
تعداد نتایج: 2470640 فیلتر نتایج به سال:
distinguishing productive zones of a drilled oil well plays a very important role for petroleum engineers to decide where to perforate to produce oil. conventionally, net pay zones are determined by applying a set of cut-offs on perophysical logs. as a result, the conventional method finds productive intervals crisply. in this investigation, a net index value is proposed, then; diffusivity equa...
موتورهای احتراق تراکمی از نوع دوسوختی در طیف وسیعی از کاربردها به کار گرفته شده است تا با استفاده از منابع سوختهای گازی رایج و ارزان- ضمن حفظ راندمان و توان خروجی موتور و حد قابل قبولی از دما و فشار محفظه سیلندر- انتشار ذرات آلاینده را به حداقل رساند. با توجه به اینکه اصولا سوختهای گازی آلودگی کمتری را تولید می کنند و ارزانتر از سوختهای مایع می باشند،سرمایه گذاری فراوانی در جهت تحقیق و توسعه ای...
there are two species of ghost shrimps namely, neocallichirus jousseaumei, n. calmani of which the latter is the first record for the persian gulf (littoral and subtidal zones). while, n. jousseaumei is first record for littoral zones along coastal waters of the persian gulf. the material of present study was collected from ouli village along the coast of bushehr province. here, notes on habita...
Barandagh quadrangle is located in northeast of Zandjan, and is a part of polymetallic region of Tarem-Zandjan. Field evidence and microscopic studies show an intimate relationship between geochemical anomalies and alteration zones in this area. Based on the field observations and mineralogical studis, these zones, in light of extent, locality, and constituent mineral assemblage, differ fr...
A risk assessment of vegetation zone responses to climate change was conducted using the classical Holdridge life zone model on the Loess Plateau of Northwest China. The results show that there are currently ten vegetation zones occurring on the Loess Plateau (1950–2000), including alvar desert, alpine wet tundra, alpine rain tundra, boreal moist forest, boreal wet forest, cool temperate desert...
In this expression, R is a lattice vector between a pair of unit cells: R = ua + vb + wc ; u, v, and w are integers and the dot product k R = kau + kbv + kcw . (In two dimensions, R = ua + vb and k R = kau + kbv .) At this point, we need to clarify the meaning of the vector k and find a way to define the twoand three-dimensional Brillouin zones. To do this, let’s consider the general, oblique, ...
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