نتایج جستجو برای: decades of 70 s and 90 s
تعداد نتایج: 24161899 فیلتر نتایج به سال:
در این پایان نامه خواص مولدها و مولدهای تصویری دوری را در رسته ی s-سیستم های مرتب جزئی مورد مطالعه قرار می دهیم که در آن s یک تکواره مرتب جزئی است. نشان می دهیم برای هر a در رسته ی pos نگاشت pos(-,a) با عملی که روی آن تعریف می کنیم یک تابعگون مرتب جزئی با این ویژگی است که هر شیء از pos(s) پس از قرار گرفتن در آن می تواند به یک شیء در رسته ی (t)pos و بالعکس تبدیل شود. این ویژگی تحت شرایطی به ارتب...
The purpose of this review was to get significant experimental data about the acid etching technique upon pulpo-dentinal complex highlighting aspects such as pulpal biology and dentinal permeability. Studies since early 70's, going 80's 90's show value retention well need protective bases lower toxic effects etching.
in this thesis, barium ferrite nano particles were prepared by sol-gel method. their structural and magnetic properties of samples have been investigated using thermo gravimetric analysis (tg-dta), x-ray powder diffractometer (xrd), fourier transform infrared (ftir), scanning electron microscopy (sem), field emission scanning electron microscopy (fesem), ac susceptometer, vibrating sample magne...
introruction khawf in(iran)-herat and mazaresharif and shirkhan bandar in (afghanistan)-dushanbe in (tajikistan)_(kirgizstan)-kashghar in(china) project railway network is under construction that it is as a significant corridor for revitalizing silk road corridor in the region .at the present there are three different gauge in the region central asia with 1,520 mm gauge and turkey-islamic repu...
A.D. TOMASCH 1), S.P. AHLEN 2), S.W. BARWICK 3), T.J. BEATTY 2), C.R. BOWER 4), G. GERBIER 7) , R.M. HEINZ 4), D.M. LOWDER 3), S . McKEE 1) , J.L . N!ILLER 5°, S.L. MUFSON J.A. MUSSER ", P.B. PRICE 3), M.H. SALAMON 6), G. TARLÉ t) and B. ZHOU 2) "Randall Laboratory, Department of Physics, University of Michigan, Ann Arbor, MI 48109-1120, USA 2) Department of Physics, Boston University, 590 Comm...
since the late seventies the german literary scene has witnessed a rising presence of german writers of foreign extraction examining their intercultural experiences on pivotal topics like refugees, schism, alienation, identity crises, and social and cultural conflicts. this paper deals with the method of presentation of the conflicts and problems related to culture, society and identity as depi...
abstract abstract of thesis (includes summary, goals, execution methods, and results) story “al-obnosat al-bayza” is one of the short stories from “hanna mineh” collection. this story is a selection of lives of some humans during a voyage together, each of them is a symbol of human nature (love, mind, kindness) and examine social, cultural, and political aspects of governing system, and it...
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