نتایج جستجو برای: tabas
تعداد نتایج: 214 فیلتر نتایج به سال:
Distribution and establishment of plants are affected by genetic characteristics and environmental conditions. Salsola imbricata distributed in arid and semiarid area of Iran. This study investigated some ecological characteristics of Salsola imbricata in Tabas area. Edaphic characteristics of the species habitat such as texture, Ec, gypsum, lime, Na+, organic matter were investigated. Climatic...
Earthen building materials have been in common use as cheap, available, and practical construction materials in hot and dry areas for a long time. Earthen buildings exist in Iran, especially in villages, because of the large and numerous areas that have the same climate. Given that Iran is highly earthquake prone and the importance of paying attention to the possible vulnerability of all the in...
به‌کارگیری فرایند تحلیل سلسله مراتبی در مدیریت منابع حوزه آبخیز (مطالعه موردی: حوزه آبخیز نهرین طبس)
Nowadays, inappropriate land use and degradation of natural resources have led to increase of flood, soil erosion etc. In such critical conditions, an integrated planning in natural resource management with the goal of control, reclamation and conservation seems to be necessary and these kinds of purposes can be reached by an integrated watershed management. Comprehensive management of watershe...
Telecommunication tower is an important component of the basic infrastructure of communication systems and thus preserving them in events of natural disasters - such as a severe earthquake - is of high priority. In past studies, researchers have mostly considered the effects of wind and earthquake-induced loads on 3-legged (triangular cross-section) self-supporting steel telecommunication tower...
Many liquid storage tanks around the world have affected by earthquakes. This structure can store dangerous chemical liquids. Hence dynamic behavior of ground supported rectangular storage tanks is very important due to their applications in industrial facilities. In current research, the seismic behavior of two water storage rectangular concrete tanks is examined. For this purpose, these tanks...
Background and purpose: Background radiation exists naturally in the environment and human has been always exposed to it. These rays can affect living creatures and cause chromosomal damage, and genetic and somatic diseases. Hot water springs are a major source of background radiation. This study aimed at investigating the absorbed dose of environmental gamma and determining the annual effecti...
introduction drought stress reduces plant growth by affecting various physiological and biochemical processes, such as photosynthesis, respiration, translocation, ion uptake, carbohydrates, nutrient metabolism and growth promoters. garlic (allium sativum l.) is an annual bulb crop that has been cultivated since ancient times and was used as a spice and condiment for many centuries. garlic is an...
the nayband strike-slip fault forms the western margin of the micro-continental lut block in eastern iran. neogene and quaternary mafic volcanic rocks collected near tabas, along the northern part of the fault (nnf; 15 ma), and further to the south, along the middle part of the fault (mnf; 2 ma), are within-plate sodic-series alkali olivine basalts with high tio2 and up to >16% normative nephel...
Earthen building materials have been in common use as cheap, available, and practical construction materials in hot and dry areas for a long time. Earthen buildings exist in Iran, especially in villages, because of the large and numerous areas that have the same climate. Given that Iran is highly earthquake prone and the importance of paying attention to the possible vulnerability of all the in...
بررسی های دانشمندان و محققین بر روی قاب میانپر از اوایل سال 1950 میلادی آغاز و تاکنون تحقیقات زیادی در زمینه شناخت رفتار میانقابها و عوامل موثر بر آنها انجام شده است. این اعضای سازه ای به دلایل گوناگون از جمله پیچیدگی رفتار مصالح، اندرکنش بین قاب و میانقاب، ضعف مدلهای تحلیلی و غیره تا مدتها یکی از بحث برانگیزترین موضوعات روز مهندسی بوده است. میانقابها باعث افزایش سختی سازه می شوند لذا وجود این ...
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