نتایج جستجو برای: the daily temperature change

تعداد نتایج: 16209775  

ژورنال: علوم آب و خاک 2009
صفایی, ناصر, علیزاده, عزیزالله, موسی نژاد, صدیقه,

A comprehensive study is underway now to determine the predicting factors of rice blast and its loss assessment in Guilan province. In a preliminary study, the effect of climatic factors on spores population and forecasting the disease were considered. So, during cultivation season of 2006 and 2007, some fields were chosen five kilometers away from weather stations in three regions of Guilan, i...

پایان نامه :دانشگاه بین المللی امام خمینی (ره) - قزوین - دانشکده علوم پایه 1390

چکیده : * در یک واکنش تک ظرفی و با استفاده از واکنش آلدهید های آروماتیک و 3- متیل 1- فنیل پیرازولین-5- ان با نسبت مولی 1:1، ساختارهای هتروسیکل پیرازول سنتز شد. از مزایای آن، انجام واکنش در دمای اتاق، عدم نیاز به کاتالیزور، بازده بالای واکنش، استفاده از آب بعنوان حلال سبز و بی خطر به جای حلال های آلی وسمی می باشد . * توانستیم با استفاده از ملدرام اسید ومشتقات 2- هیدروکسی بنزآلدهید، ترکی...

Journal: :پژوهش های جغرافیای طبیعی 0
بهروز سبحانی دانشیار آب‎وهواشناسی، دانشگاه محقق اردبیلی، اردبیل، ایران فخری سادات فاطمی نیا دانشجوی دکتری آب‎وهواشناسی کشاورزی، دانشگاه محقق اردبیلی، اردبیل، ایران

introductionclimate change has played an important role in all aspects of human life. therefore, climatepredictions in atmospheric general circulation models (gcm) will have particular importance.in this study, downscaling by a1b scenarios, ipcm4 and bcm2 of atmosphere generalcirculation models in lars-wg model are used for analysis of climate change impacts onmaximum and minimum temperature, s...

Mehrdad Esfandiari Navid adibifard S.R. Hassanpour Avanji Zohreh Baniabbass,

Today climate change is one of the most important human concerns This fact affected human life in different ways .  one of the most important impacts of climate change is on crops yield so that change in temperature  regime  particularly maximum and minimum  temperatures  is noticeably change plants production . in this research , is considered to  impact of climate change on water requirement ...

Doroodzan Dam basin is one of the strategic agricultural areas in Fars province. Changes in time series of climatic parameters, especially temperature and precipitation parameters, can have a significant impact on the growth cycle of agricultural products, the status of water resources and the economy of the populations in the area. In the present study, rainfall and temperature trends were inv...

Journal: :جغرافیا و مخاطرات محیطی 0
زهرا حجازی زاده دکتر سید محمد حسینی علی رضا کربلایی درئی

1. introduction climatic change is one of the most important challenges human beings have confronted with in recent centuries due to its severe effects on water resources, agriculture, energy, tourism and even human bioclimatic. developing strategies, making decisions with awareness about water consumption in different parts in the future, and available water resources management require climat...

Journal: :Current opinion in biotechnology 2016
Thulani Peter Makhalanyane Marc Warwick Van Goethem Don Arthur Cowan

Global change is disproportionately affecting cold environments (polar and high elevation regions), with potentially negative impacts on microbial diversity and functional processes. In most cold environments the combination of low temperatures, and physical stressors, such as katabatic wind episodes and limited water availability result in biotic systems, which are in trophic terms very simple...

2016
Shifei Qi Hualing Yang Juan Chen Xiaoyang Zhang Yingping Yang Xiaohong Xu

The quantized anomalous Hall effect (QAHE) have been theoretically predicted and experimentally confirmed in magnetic topological insulators (TI), but dissipative channels resulted by small-size band gap and weak ferromagnetism make QAHE be measured only at extremely low temperature (<0.1 K). Through density functional theory calculations, we systemically study of the magnetic properties and el...

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