نتایج جستجو برای: discharge trend at studied station was very little increasing

تعداد نتایج: 6573790  

Journal: :desert 2009
m. karimpour reyhan y. esmaeilpour a. malekian n. mashhadi n. kamali

this study was conducted to identify drought event and its emerging regions in markazi desert, iran with focus onsemnan province in a 30 years statistical period. in this research, 61 stations having adequate data selected and usedafter extracting annual statistic from monthly and daily data. standardized precipitation index values for each stationwere calculated and classified. the results hav...

ژورنال: علوم آب و خاک 2009
سلطانی, سعید, صبوحی, راضیه ,

Climate change has important effects on earth environment and human life. Therefor, investigation and study of climate change is very essential. This study investigated rainfall, temperature, relative humidity and wind variability by analyzing data for annual and monthly climatic factors collected at 13 synoptic stations (industrial cities of Iran) by using Mann-Kendall test. The results of mon...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه یزد - دانشکده علوم انسانی 1391

the rise and stublishment of safavid dynasty was depend on triangle of tasavof, tashayo and royalty, kings legitimized their power upon these. therefore for the understanding the functions of that period we must explore the role of this elements. although application and emphsise upon dignities such as; complete mentor (morshede kamel), deputy of absent imam (nayebe imame ghayeb), and god’s sha...

Journal: :international journal of environmental research 0

nano-cus powders were synthesized with chemical solution method. xrd and sem and spectrophotometry were used for characterization of the cus powders. xrd analysis indicated that tetragonal cus was the main phase with particle size of 16.2nm and little cu2s phase was present. scanning electron microscopy (sem) analysis revealed that powder was plate like and had very little aspect ratio in morph...

پایان نامه :دانشگاه آزاد اسلامی - دانشگاه آزاد اسلامی واحد گرمسار - دانشکده ادبیات، زبانهای خارجی و تاریخ 1389

abstract the main purpose of this study was to investigate whether there was any significant difference between the speaking achievement of learners who were trained by means of consciousness raising of sociolinguistic skills and that of learners who were trained without the above mentioned task. the participants of this study consist of 60 intermediate level students participating languag...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شیراز - دانشکده علوم 1390

any change in the refractive index of a laser active medium can lead to serious degradation of beam quality, laser beam modes, laser performance and variation in the intensity distribution. alteration in the refractive index of laser active medium is especially notable in high power lasers. it is clear that in the laser beam production, the pumping agent induces a great amount of heat which...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه علامه طباطبایی 1389

this study was an attempt to investigate the effect of using c-test passages on the reading comprehension and incidental vocabulary learning of iranian intermediate efl learners. the participants were 60 male efl learners at kish mehr institute in garmsar. in fact, there were two groups, an experimental group and a comparison group with 30 students in each. the participants were pretested throu...

Journal: :اکو هیدرولوژی 0
علی حقی زاده استادیار، دانشکدۀ کشاورزی و منابع طبیعی، دانشگاه لرستان حسین یوسفی استادیار، دانشکدۀ علوم و فنون و نوین، دانشگاه تهران یزدان یاراحمدی دانشجوی کارشناسی ارشد مهندسی اکو هیدرولوژی، دانشکدۀ علوم و فنون نوین، دانشگاه تهران پروین نورمحمدی دانشجوی کارشناسی ارشد مهندسی آبخیزداری، دانشکدۀ کشاورزی و منابع طبیعی، دانشگاه لرستان رضوان علیجانی دانشجوی دکتری مهندسی آبخیزداری، دانشکدۀ کشاورزی و منابع طبیعی، دانشگاه لرستان

kahman is the most beneficial river in alashtar city for agriculture and aquiculture. as hydrology processes have random nature, statistics and probability are base of analysis of these processes and time series are used for this purpose. the first step in time series analysis includes parameters variation through time. second step is to stationary data, third is normalization and forth is mode...

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2009
seyed mohammad heydarian babak bonakdarpour jalal mirhoseini

polygalacturonase production under different shear stress environments by aspergillus sp. was studied. it was found that the rate of enzyme production in the stirred tank fermentor decreased with increasing the stirrer speed in the range 300-750 rpm. on the other hand, in a split cylinder air-lift fermentor, the rate of polygalacturonase production slightly increased with increasing in air rate...

Journal: :تحقیقات جغرافیایی 0
علی اکبر رسولی گروه جغرافی دانشگاه تبریز احمد رضا قاسمی گروه جغرافی دانشگاه تبریز رقیه روشنی گروه جغرافی دانشگاه تبریز احمد رضا قاسمی گروه جغرافی دانشگاه تبریز

abstractprecipitation could be regarded as a complex and a very vital element in the earth atmosphere and its spatial-temporal changes can control iran's climate. in the current research, in order to model the spatial-temporal changes of annual precipitation, the data taking from 50 synoptic stations, have been analyzed during the years 1966-2005, with a suitable distribution. the most dat...

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