in this paper, the nonlinear free vibrations of thin symmetric and non-symmetric cross-ply composite plates subjected to biaxial initial stresses are investigated. because of their excellent properties such as specific strength and specific stiffness, composite plates have wide applications in aerospace and mechanical structures. based on von-karman's strain-displacement relations and using gal...

prut river is very important for sustaining the biodiversity and economical activities in its area for romania, ukraine and republic of moldova. anthropogenic activities are present everywhere especially near a big water flow because they need a close water resource. the major problems remain the impact and a possible risk produced as a negative result in these activities (agriculture close to ...

A semi-analytical model of hydroelastic slamming for two-dimensional symmetric flexible bodies is presented in this paper. The hydrodynamic loads are computed using the analytical Modified Logvinovich Model (MLM) with account elastic deflections body surface. described by modal approach. rigid and motions at same time together wetted part coupled problem impact reduced to a system nonlinear ord...

New housing areas are a ubiquitous feature of modern life in the developing and developed world alike built in response to rising social, demographic and economic pressures. Inevitably, these new developments will have an impact on the environment around them. Empirical evidence confirms the close relationship between urbanisation and ambient water quality. However, what is lacking so far is a ...

this study investigated the factors influencing the decision to plant almonds in the saman region of chaharmahal-bakhtiari province in central iran through conducting an economic survey in 2005. using portfolio investment theory and econometric model esti-mation (shively, 1998), this paper identifies the most important factors influencing the in-dividual farmer’s decision concerning the number ...

A graph is said to be symmetric if its automorphism group is transitive on its arcs. A complete classification is given of pentavalent symmetric graphs of order 24p for each prime p. It is shown that a connected pentavalent symmetric graph of order 24p exists if and only if p=2, 3, 5, 11 or 17, and up to isomorphism, there are only eleven such graphs.

A graph is called symmetric if its full automorphism group acts transitively on the set of arcs. The Cayley graph $Gamma=Cay(G,S)$ on group $G$ is said to be normal symmetric if $N_A(R(G))=R(G)rtimes Aut(G,S)$ acts transitively on the set of arcs of $Gamma$. In this paper, we classify all connected tetravalent normal symmetric Cayley graphs of order $p^2q$ where $p>q$ are prime numbers.