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...

Blind students have limitations that their teachers have to apply efficient educational methods for them. Since mathematics concepts are abstract for blind students and they cannot understand these concepts deeply, this research has tried that used and introduced cooperative learning method for this reason. Blind students have high listening capacity then cooperative learning method can pro...

The purpose of this study is survey on the relation of self-effectiveness resources and self-effectiveness beliefs level with mathematical performance of male and female students in 3rd academic year of middle school and 3rd academic year of high school (human science field of study). For this purpose, 300 students in 3rd academic year of middle school (180 males and 120 females) and 277 studen...