Abstract Based on the technical study of a composite vertical tail, mechanical properties honeycomb sandwich structure at leading edge were studied fundamental computational analysis. The stress calculation and modal analysis beam/plate are carried out by using engineering algorithm two finite element modeling methods. comparative results shows that methods can effectively simulate structure. I...

Hollow cylindrical flow mixers achieve a homogeneous mixture with less pressure loss and higher momentum. However, the low volume of mixer due to hollow creates high effects mechanical stresses on mixer. In this study, formed by considering thermal fluids in conical cylinder at different temperatures were examined. The effect taper angle has been studied. examinations carried out using finite e...

Deciding whether a collection of unrooted trees is compatible is a fundamental problem in phylogenetics. Two different graph-theoretic characterizations of tree compatibility have recently been proposed. In one of these, tree compatibility is characterized in terms of the existence of a specific kind of triangulation in a structure known as the display graph. An alternative characterization exp...

The P4-sparse Graph Sandwich Problem asks, given two graphs G 1 = (V, E1) and G2 = (V, E2), whether there exists a graph G = (V, E) such that E1 ⊆ E ⊆ E2 and G is P4-sparse. In this paper we present a polynomial-time algorithm for solving the Graph Sandwich Problem for P4-sparse graphs. c © 2008 Elsevier B.V. All rights reserved.

In this paper we introduce the simultaneous membership problem, defined for any graph class C characterized in terms of representations, e.g. any class of intersection graphs. Two graphs G1 and G2, sharing some vertices X (and the corresponding induced edges), are said to be simultaneous members of graph class C, if there exist representations R1 and R2 of G1 and G2 that are “consistent” on X ....