نتایج جستجو برای: kekulé structure
تعداد نتایج: 1567986 فیلتر نتایج به سال:
abstract the present study is concerned with the syntactic deviation in hafezs poetry. poems are known to be accompanied with various linguistic deviations. these deviations may be phonological, morphological and/or syntactic. the relatively high frequency of the cases of the syntactic deviation in hafezs poems makes this rhetorical feature as a main characteristic of his poetry. this thesis, ...
the methods which are used to analyze microstrip antennas, are divited into three categories: empirical methods, semi-empirical methods and full-wave analysis. empirical and semi-empirical methods are generally based on some fundamental simplifying assumptions about quality of surface current distribution and substrate thickness. thses simplificatioms cause low accuracy in field evaluation. ful...
امروزه ، استراتژی ها و روشهای مختلفی توسط مترجمان در زمینه ترجمه متون به کار گرفته می شود. یکی از این روشهای رایج، استفاده از شیفت ها است. مطالعه ی پیش رو کاربرد استراتژی شیفت ها در ترجمه بروشورهای تبلیغاتی مربوط به محصولات مراقبت شخصی از زبان انگلیسی به فارسی را بر اساس مدل کتفورد (1965) مورد بررسی قرار داده است. هدف این مطالعه بررسی میزان استفاده از این استراتژی از طریق مقایسه متون زبان مبدا ...
abstract the present thesis seeks to critically read george orwell’s nineteen eighty-four and animal farm in the light of louis althusser’s thought and theory. the present thesis proceeds to examine and demonstrate althusser’s major concepts including ideological state apparatuses (isas), repressive state apparatuses (rsas), the structure, the subject, and ideological interpellation which r...
Let us start with a bit of history. Today, it is hard to imagine how difficult it was to develop basic concepts and ideas of chemistry in the second half of the 19th century. The story about Kekulé’s fight for his benzene structure shows that not all the arguments he used in its favor are valid today [1]. His idea could not be supported by the poor experimental instrumentation of that time. The...
The 2,5-disubstituted thienosultines (5,7-disubstituted 1,4-dihydro-1H-3lambda(4)-thieno[3,4-d][2,3]oxathiin-3-oxides) 5a-d were prepared from the corresponding dichlorides 4a-d with the commercially available Rongalite (sodium formaldehyde sulfoxylate) in 17-60% yields. When heated in the presence of electron-poor dienophiles, sultines 5a-d underwent elimination of SO(2), and the resulting non...
this work is presented in five parts. in the first part preparation of the starting complex [pt(c^n)cl(dmso)], 1, in which c^n = n(1),c(2?)-chelated, deprotonated 2-phenylpyridine, and dmso = dimethylsulfoxide, and its reaction with 1 equiv of the biphosphine ligands bis(diphenylphosphino)amine, dppa, or bis(diphenylphosphino)methane, dppm, to give the complex [pt(c^n)cl(dppa)], 2, or [pt(c^n)c...
Scientifi c inquiry can be viewed as “an ocean, continuous everywhere and without a break or division,” in Leibniz’s words (1690/1951, p. 73). Hans Reichenbach nonetheless divided this ocean into two great seas, the context of discovery and the context of justifi cation. Philosophers, logicians, and mathematicians claimed justifi cation as a part of their territory and dismissed the context of ...
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