soil characteristics is very important in water erosion processes. the present investigation was conducted in gully lands of ardebil province, iran, to assess the role of soil texture and structure on aggregate stability using wet sieve method. to achieve the study purposes, mean weighted diameter of aggregates was calculated, and its relationships with lime and clay percentages, sodium absorpt...

the objective of this research was to study genotype×environment interaction and to evaluate stability analysis of grain yield in chickpea genotypes under rainfed condition. experimental material was comprised of 17 genotypes with the experiments carried out in rcbd of four replications at kermanshah, lorestan, ilam, gachsaran and gorgan research stations during the two years of 2003-2004. the ...

in order to study adapatability and yield stability of irrigated bread wheat cultivars alvand, alamout, zarrin, navid, azar 2, sabalan, omid and bezostiya this experiment was conducted in rcbd during three cropping seasons (2007-2010) in six cities. simple anova and combined analysis of variance for three years in every location and also combined analysis of variance for three years and six loc...

An explicit numerical method to solve a fractional cable equation which involves two temporal Riemann-Liouville derivatives is studied. The numerical difference scheme is obtained by approximating the first-order derivative by a forward difference formula, the Riemann-Liouville derivatives by the Grünwald-Letnikov formula, and the spatial derivative by a three-point centered formula. The accura...

in this article, after examining the definitions of »political stability«, the impact of political stability and instability on development is explained. but, beyond the limited definition of political stability, its broad meaning, including social and political environment, is the major concern of this article. in order to realize development, it is necessary to have a calm and peaceful socio-...

We consider the classical Taylor series approximation to the solution of initial value problems in ordinary diierential equations and examine implicit variants for the numerical solution of stii ODEs. The Taylor coeecients of the state vector are found to be closely related to those of the Jacobian of the right hand side along the solution trajectory. These connections between state and Jacobia...

We study hedonic coalition formation games in which cooperation among the players is restricted by a graph structure: a subset of players can form a coalition if and only if they are connected in the given graph. We investigate the complexity of finding stable outcomes in such games, for several notions of stability. In particular, we provide an efficient algorithm that finds an individually st...

in this paper, we consider orthogonal stability of mixed type additive and cubic functional equation of the form $$f(2x+y)+f(2x-y)-f(4x)=2f (x+y)+2f(x-y)-8f(2x) +10f(x)-2f(-x),$$ with $xbot y$, where $bot$  is orthogonality in the sense of ratz.

many characteristics of pear trees such as growth, fruit size and yield, are influenced by the genetic characteristic of the rootstocks. in iran, mainly european pear seedlings (pyrus communis l.) are used as the rootstock in the pear orchards. thus, evaluation of pear seedling rootstocks is an important task. this experiment was conducted in 2009 and 2010 growing seasons in order to explore th...