نتایج جستجو برای: sudden environment change and etc therefore

تعداد نتایج: 16944920  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه سیستان و بلوچستان - دانشکده مهندسی عمران 1391

in this study, scour of mashkid bridge pier located in mashkid river of saravan county has been studied and to measure the scour rate, the numerical model hec-ras 4.0 has been used. upon selection of mashkid river as the case study and whereas the studied zone is important with respect to the climatic conditions and showery monsoon raining and flowing the great and destructive floodwaters, ther...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی خواجه نصیرالدین طوسی - دانشکده مهندسی برق و کامپیوتر 1391

power transformers are important equipments in power systems. thus there is a large number of researches devoted of power transformers. however, there is still a demand for future investigations, especially in the field of diagnosis of transformer failures. in order to fulfill the demand, the first part reports a study case in which four main types of failures on the active part are investigate...

ژورنال: علوم آب و خاک 2018

In this study, in order to analyze the trends of annual precipitation, the information from 21 synoptic meteorological stations located in the Urmia Lake basin in a 30-year time period (1986-2015) was used. For this purpose, the Sequential Mann-Kendall test was used. The date of sudden change (if exist) in the precipitation time series of each station was identified. Significance of the trend i...

پایان نامه :دانشگاه آزاد اسلامی - دانشگاه آزاد اسلامی واحد تهران مرکزی - دانشکده ادبیات و علوم انسانی 1391

abstract: one of the most visited & important spaces in different countries by tourist are urban areas. the old tehran which major part is located in district 12 is historical showcase of the capital, but, its hiidden cultural attraction is not used as it should be. this thesis occasionally engage in studying the efficacy of correct installation of travel guide boards in welfare & easily acc...

Journal: :iranian journal of earth science 0
e. uyigue executive director, community research and development centre (credc),266 ugbowo-lagos road, benin city o. a. ediang nigerian meteorological agency, pmb 1215 oshodi lagos, nigeria. a. a. ediang nigerian meteorological agency, pmb 1215 oshodi lagos, nigeria.

climate change and its possible impacts on the environment and socio-economic systems now constitute the most important environmental problem facing mankind in the 21st century. climate change will increase poverty and hardship, endanger food security, destabilize economies, decrease food and water and create social insecurity in many countries and undermine our goals for achieving sustainable ...

Journal: :فیزیک زمین و فضا 0
مرتضی فتاحی استادیار، گروه فیزیک زمین، مؤسسة ژئوفیزیک دانشگاه نازلی صبا کارشناس بخش یونسفر، مؤسسه ژئوفیزیک دانشگاه تهران سلمان محسنی مسئول تست آزمایشگاه روشنایی، دانشکده برق، پردیس دانشکده های فنی، دانشگاه تهران

iran is one of the limited numbers of ancient countries which is almost totally located on earthquake belt. earthquakes have always been the most important natural hazard in iran. many villages, cities, civilizations and monuments have been partly or totally destroyed by past earthquakes in iran. as a developing country, iran is expanding its cities, industries, dams, power plants etc. the rece...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه اصفهان - دانشکده علوم 1389

this research concentrates on the lithostratigraphy, biostratigraphy, microfacies and sedimentary environment of the asmari and gachsaran formations at southwest firuzabad. the thickness of the studied section in all 608.95 meters that 220.8 meters belong to the asmari formation and 387.95 meters belong to the gachsaran formation (champe and mol members). in the study area, the asmari formation...

Journal: :iranian journal of pathology 2011
marwah nisha sethi bhawna gupta sumiti duhan amrita singh sunita

background and objectives: in spite of large number of studies conducted so far, sudden cardiac death remains an enigma and relative importance of acute coronary events as a trigger of sudden death is currently unclear. an autopsy study of heart was therefore planned to observe various histomorphological cardiac changes, and to determine the frequency association of acute coronary events and my...

Climate has always been changing during the lifetime of the earth, and has appeared in the form of the ice age, hurricanes, severe and sudden temperature changes, precipitation and other climatic elements, and has dramatically influenced the environment, and in some cases has caused severe changes and even destructions. Some of the most important aspects of climate changes can be found in preci...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تربیت معلم تهران - دانشکده علوم 1370

determination of uranium in natural water and complex solutions using ion exchange chromatography: a combined procedure using ion exchange chromatography and uv-vis spectrophotometry techniques has been developed to measure uranum in natural water and complex solutions. after conditicing , one hundred milli liters of sample solutions have been passed through an ion exchange column,pachked with ...

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