نتایج جستجو برای: aspects ratio
تعداد نتایج: 845696 فیلتر نتایج به سال:
In 1960s V.Geodakian proposed a theory that explains sexes as a mechanism for evolutionary adaptation of the species to changing environmental conditions. In 2001 V.Iskrin refined and augmented the concepts of Geodakian and gave a new and interesting explanation to several phenomena which involve sex, and sex ratio, including the war-years phenomena. He also introduced a new concept of the ”cat...
the aim of present research is to determine and prioritize criteria and scales ofevaluating cohesive training systems. present paper attempts to provide a paradigm forbetter devising of universities' cohesive training systems by identifying such scales. itspopulation includes elite training experts in the colleges and institutes affiliated touniversity of tehran. it attempts to study domes...
Abstract. Recently ratio-dependent predator-prey models have become the focus of considerable attention in theoretical ecology in their own right. In this paper, we have studied the deterministic and stochastic dynamical aspects of stability of a MichaelisMenten type ratio-dependent predator-prey system that includes discrete time-delay. Computer simulations are carried out to explain the analy...
Socioeconomic and health consequences of aging in India are analyzed. By the year 2000, India will have the second largest elderly population in the world, according to official projections. The growth rate, sex ratio, and marital, labor, and literacy status of the elderly are predicted to result in a higher dependency ratio by the 2001. Socioeconomic aspects of this aging population will af...
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Introduction and purpose: Aging population is a new phenomenon in Iran which is due to several reasons such as decrease in birth rate, increase in medical advances, health, education and prolonged life expectancy. The current study aim to investigate economic and social aspects of elderly population such as median age of population, dependency ratio, sex ratio, marital status, litearcy and empl...
Abstract. Marriage, along with the mechanisms of realization and the order and arrangements related to it, is one of the most important social, cultural and biological phenomena that is both affected by the changes in society and influential on it. In recent decades, despite the relative continuity in some aspects, attitudes and behaviors related to marriage in Iran, the timing of marriage has ...
Introduction: Leishmaniasis is a complex parasitic disease with various epidemiological and clinical features. Visceral leishmaniasis (VL) can be extremely fatal in untreated cases. The objective of this study was to assess the epidemiological and clinical aspects of the disease in children with VL in Kerman province during 1991-2006. Method: In a descriptive-analytical survey, medical file...
Fenton process, as one of the most conventional advanced oxidation processes, is widely used in the treatment of specific wastewaters, especially landfill leachate. In current study, the main target was to evaluate some neglected aspects of Fenton process in operational applications. Thus, three novel responses were introduced. Mass removal efficiency evaluates overall recalcitrant destruction ...
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