منابع مشابه
Maximum Load and Minimum Volume Structural Optimization
A bi-criteria optimization is considered whose objectives are the maximization of the load sustained by a structure and the minimization of the structure's volume. As the objectives are conflicting, the solution to the problem is of the Pareto type. The problem is elaborated for a thin-walled column of cruciform cross-section, prone to flexural and torsional buckling. A numerical example is als...
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Let $G$ be a connected graph on $n$ vertices. $G$ is called tricyclic if it has $n + 2$ edges, and tetracyclic if $G$ has exactly $n + 3$ edges. Suppose $mathcal{C}_n$ and $mathcal{D}_n$ denote the set of all tricyclic and tetracyclic $n-$vertex graphs, respectively. The aim of this paper is to calculate the minimum and maximum of eccentric connectivity index in $mathcal{C}_n$ and $mathcal{D}_n...
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We discuss worst-case bounds on the ratio of maximum matching and minimum median values for finite point sets. In particular, we consider “minimum stars,” which are defined by a center chosen from the given point set, such that the total geometric distance L S to all the points in the set is minimized. If the center point is not required to be an element of the set (i.e., the center may be a St...
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In an alternative approach to \characterizing" the graph class of visibility graphs of simple polygons, we study the problem of nding a maximum clique in the visibility graph of a simple polygon with n vertices. We show that this problem is very hard, if the input polygons are allowed to contain holes: a gap-preserving reduction from the maximum clique problem on general graphs implies that no ...
متن کاملthe effects of multiple intelligences (focus on musical, visual, and linguistic) and direct instruction on learning grammar: a case on iranian efl students at elementary level
1.0 overview it seems that grammar plays a crucial role in the area of second and foreign language learning and widely has been acknowledged in grammar research. in other words, teaching grammar is an issue which has attracted much attention to itself, and a lot of teachers argue about the existence of grammar in language teaching and learning. this issue will remind us a famous sentence f...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 1993
ISSN: 0004-637X,1538-4357
DOI: 10.1086/173077