نتایج جستجو برای: positive mathematical programming model
تعداد نتایج: 2994317 فیلتر نتایج به سال:
abstract management of water resources in iran is faced with growing demand for water resources, a considerable increase in the costs of supplying additional water and uncontrolled exploitation of underground waters. economists suggest water pricing to improve water use efficiency; however, government tends to reject that advice due to political risk, economic and cultural concerns. we used a p...
objective: water scarcity is a growing global problem and increasing population pressures, living standards and the growing demand for environmental quality have evoked all the governments to represent better solutions about water resources management. in addition, there are growing political ties for reducing water use in agriculture that follow enough environmental benefits and increase the w...
in this study economic and welfare impacts of establishing irrigation water market in qazvin province as well as potentiality of irrigation water transfer under stress irrigation conditions in the cities of qazvin province were analyzed. to achieve the above objectives, positive mathematical programming model and state wide agricultural production functions were used. to achieve applicable resu...
با گسترش کشاورزی آبی در بسیاری از مناطق و بروز خشکسالی در سال های اخیر،اقتصاد بخش کشاورزی با محدودیت های جدی روبه شده است. هدف این پژوهش، به کارگیری الگوی برنامه ریزی ریاضی مثبت در مدیریت منابع آب های سطحی و زیرزمینی در میان بهره برداران زراعی شهرستان قاین است.با استفاده از کالیبراسیون تابع هزینه درجه دو و سه سناریو ( کاهش 15، 65 و 85 درصدی برای بهره برداران گروه 1 و کاهش 15، 60 و 85 درصدی برای...
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...
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