نتایج جستجو برای: history of stresses
تعداد نتایج: 21185299 فیلتر نتایج به سال:
throughout the history, there have been deep cultural as well as scientic connections between iran and india. in medieval period, many persian physicians immigrated to india mainly because of political and social reasons. a good example of this was mirza mohammad hashem alavi khan shirazi who belonged to shiraz medical doctrine. he was born in shiraz, but immigrated to india and was in the cou...
scholars have long been interested in the role of population and its impact on the economy of various countries, hence the theories on the subject. while malthus’ population theory presents a very pessimistic view and is formulated in a context which does not correspond to the conditions of the modern world, it occupies the minds of a majority of economists. it is interesting to know, while mal...
الملخّص الحنین إلی الوطن، کان من الموضوعات الأساسیّه منذ أزمنه قدیمه فی الأدب العربی. فی العصور الماضیه کان یبین الشعراء تذکاراتهم الجیّده، و الحنین إلی الحبیبه ، و القبیله، و الأطلال و الدمن بتحسّر فی أشعارهم. توجد نماذج منها فی أشعار إمرء القیس و عنتره و... . راج هذا النوع من الحنین فی أشعار الشعراء فی العصر الأموی و العباسی کثیراً بسبب الفتوحات و الهجره. نحن شاهدنا آثاراَ کثیره کـ«الحنین إلی الأو...
fennel (foeniculum vulgare mill.) is widely cultivated for its edible, strongly-flavored leaves, fruits, seeds andmedicinal uses. as the wild and cultivated plants are influenced by environmental stresses, the effects of salt (25, 50 and 75 mm nacl), nitrogen and iron deficiency (0 n, 0.5 n of hoagland’s solution, 0 fe and 0.5 fe ofhoagland’s solution), 2°c cold (2, 3 and 4 h) and drought (3, 5...
چکیده «محکم و متشابه»، «نسخ» و «قرائات» از موضوعات مهم علوم قرآنی است. آیت الله معرفت در هر سه موضوع ضمن نقد دیدگاههای گذشته و رایج، به ارائه نظریاتی بدیع پرداخته اند. تعریف روشن از محکم و متشابه، تفاوت بین متشابه و مبهم، طبقه بندی تشابه به ذاتی و عرضی و ضابطه مند ساختن معانی تأویلی و باطنی، از جمله نوآوری های آیت الله معرفت در حوزه محکم و متشابه به شمار می رود. در موضوع نسخ، شاهد دو قرائت...
The phenomenon of Western Sufi teachers is unique, not just because of the individuals themselves, though they are certainly fascinating, but because of what they represent: the flowering of the Western genius, which has discovered Eastern traditions, absorbed them and in the process changed them and been changed by them. This paper is a primary outline of the main contours of this phenomenon, ...
This paper presents the prediction of fatigue life and crack propagation in the railway wheel due to the stress field caused by mechanical loads and press fitting process of a railway wheel. A 3-D nonlinear stress analysis model has been applied to estimate stress fields of the railway wheel in press fitting process. Finite element analysis model is presented applying the elastic–plastic fin...
The Effect of Temperature Gradients on Stress Development During Cryopreservation via Vitrification.
This study addresses the problem of thermal stress development in bulky specimens during cryopreservation via vitrification (vitreous means glassy in Latin). While this study is a part of an ongoing effort to associate the developing mechanical stress with the relevant physical properties of the cryopreserved media and to its the thermal history, the current paper focuses exclusively on the rol...
Due to their aesthetic value and high compressive strength, dentists have recently employed ceramics for restoration materials. Among the ceramic materials, zirconia provides high toughness and crack resistant characteristics. Residual stresses develop in processing due to factors including grain anisotropy and thermal coefficient mismatch. In the present study, polychromatic X-ray (Laue) micro...
مقدمه : تاریخچه بیماری سل را می توان با قدمت بشریت برابر دانست. در بررسی های انجام شده بر روی اسکلت گذشتگان، تغییرات مرضی ناشی از میکروب سل مشاهده گردید. قدیمی ترین نمونه بدست آمده مربوط به ۴۰۰۰ الی ۷۰۰۰ سال قبل از میلاد مسیح بوده است. بقراط اصطلاح فساد بافتی و بیماری سل را به کار برد. ارسطو" اعتقاد داشت که این بیماری مسری است. همچنین ویجیتوس اشاره کرده که حیوانات نیز دچار این بیماری می شوند. ...
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