for a given riemannian manifold (m,g),it is an interesting question to study the existence of a conformal diffemorphism (also called as a conformal transformation) f : m ! m such that the metric g? = fg has one of the following properties: (i)(m; g?) has constant scalar curvature. (ii)(m; g?) is an einstein manifold.

abstract the present study was conducted to investigate the effectiveness of a rather newly developed method in language teaching that is the use of paragraph reading task and whole reading task and their effects on improving efl learner’s speaking ability. to fulfill the purpose of the study, first 90 participants studying their course at sa eedi high school in tehran were chosen by means of ...

پالپوتومی شایعترین درمان در مولرهای شیری بدون علامت با اکسپوژر پوسیدگی می باشد وتوانایی سیل سمان بکار رفته در درمانهای پالپ یکی از مهمترین عوامل در تعیین پیش آگهی درمان می باشد.هدف از مطالعه حاضر بررسی ریزنشت باکتریایی سمانهای زونالین، mta، cem و یک ماده جدید به نامz-dent8-as در درمان پالپوتومی می باشد

the ability to speak two languages in the world is a remarkable achievement. there is a good reason to believe that bilingualism is the norm for the majority of people in the world because 70% of the earth’s population are supposed to be bilingual or multilingual. various investigations have shown that the native language impacts foreign word recognition, and this influence is adapted by the de...

چکیده کانسار پلی متال تکنار د ر شهرستان بردسکن (استان خراسان رضوی) و زون تکتونیکی تکنا ر واقع شده است. زون تکنار از جنوب به گسل درونه و از شمال به گسل تکنار - ریوش محدود می شود. محدوده های معدنی تکنار در حد فاصل گسل های ساختاری درونه و تکنار - ریوش و در بخش های شمال تا غرب این زون قرار دارند. مجموعه معادن مس تکنار شامل محدوده های تکنار 1، تکنار 2، تکنار 3 و تکنار 4 به لحاظ دارا بودن عناصری نظی...

from 1950s onward, new theories and critical approaches burgeoned across humanities. these theories were context-oriented; as a result, the analysis of discursive practices gained significance. thus, social, political, historical and cultural discourses that have been hitherto marginalized and considered inferior to literary texts, were introduced as important texts to be analyzed by critics. o...

the present study aimed at exploring cognitions of iranian english teachers within the context of english for academic purposes (eap). to this end, the cognitions of two groups of eap teachers with respect to their pedagogical content knowledge (pck) and their sense of professional identity (pi) were probed. two language teachers and two content instructors who had at least five years of eap te...

in this thesis, a new optically active poly(amide-imide) (pai) was synthesized by the indirect polycondensation reaction of the l-phenylalanine based diacid chloride and 4,4?-diaminodiphenylether in the presence of triethylamine in n-methyl-2-pyrrolidone. the formation of pai was confirmed by ftir, 1h nmr and elemental analysis. in next step, the surface of titanium dioxide (tio2) nanoparticles...

چکیده اهمیت اشیاء در نگاه انسان از آغاز پیدایش در زندگی جریان داشته و تاکنون نیز ادامه دارد. ساخت اشیاء از انواع کاربردی و آئینی آغاز و تا انواع الکترونیکی آن به همزیستی مسالمت آمیزی با انسان منتهی گشته است. حال اینکه این همزیستی در هر دوره ای از تاریخ چگونه خودنمایی می کند از اهمیت بسیاری برخوردار است.این رساله به بررسی موقعیت شی از جنبه های زیبایی شناسی، هویت مداری، نمادگرایی، جامعه شناسی ...