نتایج جستجو برای: kopet dagh

تعداد نتایج: 160  

Journal: :فیزیک زمین و فضا 0
سید هانی متولی عنبران عضو هیات علمی موسسه ژئوفیزیک دانشگاه تهران وحید انتظارسعادت دانشجو علی جاماسب دانشجو

using global free air gravity and topography data, first we have calculated a bouguer anomaly (ba) map for iranian plateau and then computed the residual isostasy anomaly map under the airy-heiskannen assumption. the term residual is used as to reflect the assumption of local isostatic compensation in contrast to a regional isostatic compensation. the value with which the gravity effect of the ...

Journal: :فیزیک زمین و فضا 0
عیسی منصوری کرمانشاهی دانشجوی دکتری الکترومغناطیس، گروه فیزیک زمین، مؤسسة ژئوفیزیک، دانشگاه تهران، ایران بهروز اسکویی استادیار، گروه فیزیک زمین، مؤسسة ژئوفیزیک، دانشگاه تهران، ایران

a detailed standard magnetotelluric (mt) study was conducted to recognize brine bearing layers in depths of less than 2000 m in the northeast of iran close to the southeastern shore of the caspian sea. long and medium period natural-field mt methods have proved very useful for subsurface mapping purpose by determining the resistivity of the near surface structure. mt data were analyzed and mode...

Journal: :فیزیک زمین و فضا 0
فرزام یمینی فرد استادیار، پژوهشگاه بین المللی زلزله شناسی و مهندسی زلزله، تهران علی مرادی استادیار، گروه فیزیک زمین، مؤسسة ژئوفیزیک دانشگاه تهران

tehran, iran’s capital with a population of more than 10 million is located in the southern foothills of the alborz collision zone. the alborz mountain belt of northern iran results from the collision of a piece of the gondwana with eurasia in the late triassic (sengor et al., 1988). the alborz active mountain range which consists of several sedimentary and volcanic layers, with east-west trend...

ژورنال: علوم آب و خاک 2004
ناصر اصغرزاده, , رقیه حاجی‌بلند, , زهرا مهرفر, ,

A great number of studies have been conducted on the role of Azotobacter - a free living N2-fixer - in agricultural soils, but our information is lacking on the importance of Azotobacter in pasture soils. This research was conducted to study the relationship between ecological and edaphical factors with the population of the bacteria in soil. Soil samples were taken from two sites in Azarbaidja...

Journal: :فیزیک زمین و فضا 0
اصغر آزادی پژوهشگاه بین المللی زلزله شناسی- دانشجوی دکتری غلام جوان دولویی پژوهشگاه بین المللی زلزله شناسی- استادیار ناصر حافظی مقدس دانشگاه صنعتی شاهرود- دانشیار خالد حسامی آذر پژوهشگاه بین المللی زلزله شناسی- استادیار

the nw-se trending tus fault is one of the active faults in the north-east of iran . geomorphologic evidences indicate that this fault is active and goes through mashhad city from near tus town. since the population and number of pilgrims in this city are high, the study of the tus fault is of great importance. hence, we have carried out a new investigation to evaluate the hazardous potential o...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2001
A Chakrabartty

T amyloidoses are diseases of protein conformation, in which a particular soluble innocuous protein transforms and aggregates into an insoluble fibrillar structure that deposits in extracellular spaces of specific organs (reviewed in refs. 1–4). Organ dysfunction accompanies fibrillar deposition, and the amyloid hypothesis proposes a cause and effect relationship between deposition and dysfunct...

ژورنال: کواترنری ایران 2019
, , Amiri, Zaniar, Khormali, farhad,

Introduction: Along with the climate, Soil is an essential natural resource. Although soil studies in Iran have been started more than 50 years ago, the soil map of the country has not been fully prepared yet, and only 20-25% of the lands have been mapped already. Many soil maps of Iran need to be updated, but the common methods in soil mapping are costly and time-consuming. Hence, using data o...

Journal: :زمین شناسی اقتصادی 0
سجاد مغفوری ابراهیم راستاد فردین موسیوند

introduction the mn mineralization occurs in the northeastern segment of the sabzevar zone (sz), north of the central iranian microcontinent (cim). this zone (sz) is located between the cim fragmentation in the south and the kopeh dagh sedimentary sequence in the north. the ore deposits of the northeastern segment of the sabzevar zone can be divided into three groups, each with different metal ...

The earthquake is a natural disaster that damages structure and lifeline and is simply inserted into human artifacts. For this reason the structures and lifeline, earthquake loads shall estimate and in order to provide its design.in Iran earthquake, risk of natural disasters is dominant. It should be noted that Iran in recent years, an earthquake with a magnitude of 7.5 Richter scale or more fr...

Journal: :فیزیک زمین و فضا 0
احمد سدیدخوی استادیار،گروه فیزیک زمین، مؤسسه ژئوفیزیک دانشگاه تهران، ایران زهرا علیخانی دانش آموخته کارشناسی ارشد ژئوفیزیک (زلزله شناسی)، دانشگاه آزاد اسلامی، واحد علوم تحقیقات، تهران، ایران فروغ صدودی پژوهشگر، مؤسسه تحقیقاتی علوم زمین پتسدام، آلمان

iran is located in a roughly triangular deforming region, consisting of relatively undeformed shield areas to the southwest (arabia) and northeast and the more recently deformed, though currently inactive, southwest afghanistan block in the east. the current geological and tectonic setting of iran is due to the ongoing convergence between the arabian and eurasian plates, which resulted in the f...

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