نتایج جستجو برای: imdpa model
تعداد نتایج: 2104385 فیلتر نتایج به سال:
هدف از این تحقیق، مقایسه کارایی دو مدل IMDPA و ESAs در ارزیابی شدت بیابانزایی منطقه عمرانی گناباد در جنوب غربی استان خراسان رضوی و مدیریت مبتنی بر ارزیابی ریسک خطر بیابانزایی، بر اساس مدل برتر است. پس از جمعآوری و تحلیل دادههای اولیه، معیارها و شاخصهای دو مدل IMDPA و ESAs متناسب با شرایط منطقهای و بر اساس واحدهای ژئومورفولوژی، امتیازدهی و شدت بیابانزایی محاسبه شد. سپس ارزیابی ریسک خطر...
abstract this paper discusses several commonly used models for strategic marketing¹ including market environmental analysis methods (i.e. swot and pest analysis) and strategic marketing tools and techniques (i.e. boston matrix and shell directional policy matrix)and shows how these models may help a firm to achieve its strategic goals. at first, the main reason for doing this research is de...
Land degradation are known in dry lands as a physical - environmental and economic - social phenomenon that eventually lead to declining of soil fertility. Several processes are caused this as well as one of them is desertification. In this research attempt to modeling the process of desertification with use IMDPA model in a ten years period in southeast coastal of Iran desert, the first. Final...
چکیده در این تحقیق از داده های سنجش از دور برای بررسی تاثیر کاربری اراضی بر پدیده بیابان زایی درطی سال های1987، 2000 و 2013 به منظور تهیه نقشه کاربری دشت ابرکوه استفاده شد. بر این اساس، برای تعیین تغییرات حادث شده در محدوده مورد مطالعه از تصاویر سنجنده tm سال های 1987 و 2000 و تصاویر oli برای سال 2013 استفاده گردید. با استفاده از شاخصoif بهترین ترکیب باند ها انتخاب و سپس طبقه بندی تصاویر با اس...
rivers and runoff have always been of interest to human beings. in order to make use of the proper water resources, human societies, industrial and agricultural centers, etc. have usually been established near rivers. as the time goes on, these societies developed, and therefore water resources were extracted more and more. consequently, conditions of water quality of the rivers experienced rap...
Desertification is recognized as a serious environmental threat in Iran because of its climatic-geomorphologicconditions. Desertification and land degradation in arid, semi-arid, and dry sub-humid regions, is a globalenvironmental problem. Accurate assessment of the status and trend of desertification is instrumental in developingglobal strategies to prevent and reverse this problem. The goal o...
in this thesis, we consider a mathematical model of cancer with completely unknown parameters. we study the stability of critical points which are biologically admissible. then we consider a control on the system and introduce situations at which solutions are attracted to critical points and so the cancer disease has auto healing. the lyapunov stability method is used for estimating the un...
since its introduction in 1959, translation quality assessment (tqa) has been among the most addressed research topics in translation studies. during recent years, there has been a crucial increase on the study of tqa. various methods have come on scene. although these methods are based on scientific theories, most of them have remained at the level of theory. juliane house’s model is among tho...
در این تحقیق از روش ایرانی ارزیابی پتانسیل بیابانیزایی اراضی(imdpa) برای ارزیابی پتانسیل بیابانزایی منطقة درخت سنجد استفاده شد. پس از بررسیها و ارزیابیهای اولیه، چهار معیار اقلیم، پوشش گیاهی، خاک، زمینشناسی و ژئومورفولوژی مهم ترین معیارهای مؤثر در بیابانزایی این منطقه انتخاب شدند. با استفاده از روش فوق، امتیازات شاخصهای هر معیار تعیین شد و ارزش آن معیار با محاسبة میانگین هندسی امتیاز ش...
objective: more than 75 percent of iran is located in arid and semi-arid then land degradation and desertification are one of the crises ecological. we require a proper understanding of causes and processes of desertification to control the huge phenomenon on the global and regional situation. because southeast of iran located in arid land then assessment of desertification is very importance f...
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