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Ionics - In this paper, the simultaneous determination of β-blockers (atenolol (ATN) and propranolol (PRO)) was investigated using cyclic voltammetry (CV) and differential pulse voltammetry... 相似文献
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Sanming Zhou 《Journal of Graph Theory》2014,75(1):37-47
Unitary graphs are arc‐transitive graphs with vertices the flags of Hermitian unitals and edges defined by certain elements of the underlying finite fields. They played a significant role in a recent classification of a class of arc‐transitive graphs that admit an automorphism group acting imprimitively on the vertices. In this article, we prove that all unitary graphs are connected of diameter two and girth three. Based on this, we obtain, for any prime power , a lower bound of order on the maximum number of vertices in an arc‐transitive graph of degree and diameter two. 相似文献
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关于图的若干介值问题 总被引:2,自引:0,他引:2
对连通图G,以C_i(G),■(G)分别表G的有i条边的连通支撑子图之集与连通子图之集,以C~i(G),(?)(G)分别表G的顶点数为i的子树集与连通子图之集.本文讨论了这四类子图簇对若干基本参数及端点数的介值性,从而对已有的一些结果作了若干有意义的拓广. 相似文献
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Let Γ be a graph admitting an arc-transitive subgroup G of automorphisms that leaves invariant a vertex partition with parts of size v≥3. In this paper we study such graphs where: for connected by some edge of Γ, exactly two vertices of B lie on no edge with a vertex of C; and as C runs over all parts of connected to B these vertex pairs (ignoring multiplicities) form a cycle. We prove that this occurs if and only if v=3 or 4, and moreover we give three geometric or group theoretic constructions of infinite families of such graphs. 相似文献
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A class of multi-objective fractional programming problems (MFP) are considered where the involved functions are locally Lipschitz.
In order to deduce our main results, we give the definition of the generalized (F,θ,ρ,d)-convex class about the Clarke’s generalized gradient. Under the above generalized convexity assumption, necessary and sufficient
conditions for optimality are given. Finally, a dual problem corresponding to (MFP) is formulated, appropriate dual theorems
are proved.
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