For the purpose of identifying the sound transmission characteristics of honeycomb sandwich panels that are commonly used in aircraft industries, Finite Element Method (FEM) combined with Boundary Element Method (BEM) has been widely used. However, the latter approach is not always applicable to high frequency analysis since it requires a large number of FEM/BEM meshes resulting in high computa...

Abstract We construct a sort of regular black holes with sub-Planckian Kretschmann scalar curvature. The metric this is characterized by an exponentially suppressing gravity potential as well asymptotically Minkowski core. In particular, different choices the form, they can reproduce Bardeen/Hayward/Frolov hole at large scales. heuristical derivation performed based on generalized uncertainty p...

The ability of rats to solve a discrimination between two objects that differ in length was investigated in five experiments. Using a rectangular swimming pool, Experiment 1 revealed it is easier to locate a submerged platform when it is near the center of a long rather than a short wall. For Experiments 2-4, the objects were black or white panels pasted onto the gray walls of a square pool, wi...

What is the shape of the Universe? Is it curved or flat, finite or infinite ? Is space “wrapped around” to create ghost images of faraway cosmic sources? We review how tessellations allow to build multiply-connected 3D Riemannian spaces useful for cosmology. We discuss more particularly the proposal of a finite, positively curved, dodecahedral space for explaining some puzzling features of the ...

Title of dissertation: LENGTH SPECTRAL RIGIDITY OF NON-POSITIVELY CURVED SURFACES Jeffrey Frazier, Doctor of Philosophy, 2012 Dissertation directed by: Professor William Goldman Department of Mathematics Length spectral rigidity is the question of under what circumstances the geometry of a surface can be determined, up to isotopy, by knowing only the lengths of its closed geodesics. It is known...

Solar panel is mostly applied in many roof types on buildings. That the angle of solar radiation different curved space truss system affects amount voltage and current panels overall efficiency. In this study, meteorological information Isparta city, technical data various panels, intra-year random shadow effect calculations are analyzed. The technic genetic algorithm applied, process computeri...

If a class of finitely generated groups G is closed under isometric amalgamations along free subgroups, then every G ∈ G can be quasi-isometrically embedded in a group Ĝ ∈ G that has no proper subgroups of finite index. Every compact, connected, non-positively curved space X admits an isometric embedding into a compact, connected, non-positively curved space X such that X has no non-trivial fin...

This paper describes a wave and finite element (WFE) method for the numerical prediction of wave propagation in axisymmetric structures. A small segment of the structure is modelled using conventional finite element methods, commonly using a commercial package, and the mass and stiffness matrices found. This typically involves a single shell element or, especially for laminate structures, a sta...