نتایج جستجو برای: arid regions in each studied system

تعداد نتایج: 17364255  

Journal: :Chilean journal of agricultural research 2009

Journal: :desert 2015
saleh yousefi somayeh mirzaee mehdi tazeh hamidreza pourghasemi haji karimi

the objective of this research was to determine the best model and compare performances in terms of producing landuse maps from six supervised classification algorithms. as a result, different algorithms such as the minimum distance ofmean (mdm), mahalanobis distance (md), maximum likelihood (ml), artificial neural network (ann), spectral anglemapper (sam), and support vector machine (svm) were...

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

this work is presented in five parts. in the first part preparation of the starting complex [pt(c^n)cl(dmso)], 1, in which c^n = n(1),c(2?)-chelated, deprotonated 2-phenylpyridine, and dmso = dimethylsulfoxide, and its reaction with 1 equiv of the biphosphine ligands bis(diphenylphosphino)amine, dppa, or bis(diphenylphosphino)methane, dppm, to give the complex [pt(c^n)cl(dppa)], 2, or [pt(c^n)c...

Journal: :آب و خاک 0
حسن اقلی حسن اقلی لیاقت لیاقت

abstract recharge of aquifers by using wastewater, is one of the important and applicable ways for reusing this valuable water resource, especially in arid and semi-arid regions. as the necessity of local practices for finding the proper management strategies and optimum use of recharge systems (conforming to climate, soil, etc.), a preliminary study was carried out. three physical models were ...

Journal: :پژوهش های علوم دامی ایران 0
علیرضا ایوبی جواد آرشامی رضا ولی زاده زهرا موسوی امیر موسایی

ferula (ferula assafetida) is a perennial plant which belongs to umbelliferea family is grow in a wide range of arid and semi-arid regions in iran. ferulla assafetida contains compounds including coumarins and sesquiterpens that has been traditionally used to treat diseases such as nervous disorders, asthma, gastrointestinal disease and epilepsy.. effects of asafetida gum extract on blood param...

Journal: :The American Naturalist 1890

2009

Arid regions are an important part of the world as they cover more than 40% of the land surface and they can provide sufficient opportunities for extensive development. However, urban development of these regions is facing a set of problems. This is besides the development barriers due to the arid regions climate associated with a set of economical, social, administrative, and physical problems...

ژورنال: سلامت و محیط زیست 2022

Background and Objective: Groundwater is the primary water source for drinking and agricultural activities in arid and semi-arid regions. Rainfall, land use, geological structure, aquifer mineralogy, and duration of water contact with the environment in the basement are the main factors affecting the chemical quality of groundwater. This study aimed to determine the physicochemical properties o...

Journal: :پژوهش های جغرافیای طبیعی 0
سید حجت موسوی استادیار ژئومورفولوژی، گروه جغرافیا و اکوتوریسم، دانشکدة منابع طبیعی و علوم زمین، دانشگاه کاشان

introduction management principles predominated on the development and evolution stages of the geomorphic landscapes are different. this is because of variability in landscape evolution, its relationship with other system components and its response to environmental changes and feedback. one of the most important methods of management of geomorphic landscape is the study and evaluation of morph...

Journal: Desert 2017

The most important impacts of climate change relate to temperature and precipitation. Precipitation is particularly important, because changes in precipitation patterns may lead to floods or droughts in different areas. Also, precipitation is a major factor in agriculture and in recent years interest has increased in learning about precipitation variability for periods of months to annual and s...

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