The Drosophila melanogaster P transposable element provides one of the best cases of horizontal transfer of a mobile DNA sequence in eukaryotes. Invasion of natural populations by the P element has led to a syndrome of phenotypes known as P-M hybrid dysgenesis that emerges when strains differing in their P element composition mate and produce offspring. Despite extensive research on many aspect...

using the highly recommended numerical techniques, a finite element computer code is developed to analyse the steady incompressible, laminar and turbulent flows in 2-d domains with complex geometry. the petrov-galerkin finite element formulation is adopted to avoid numerical oscillations. turbulence is modeled using the two equation k-ω model. the discretized equations are written in the form o...

It is a challenge to find point wise (including inter-element boundary) divergence-free finite element bases. By identifying functions in the kernel of the divergence operator, we discover a local basis for the full divergence-free space of the C0-P1 finite element, on the union jack grid. The optimal order of approximation is shown for the P1 divergence-free finite elements on union jack grids...

A rigorous full-vectorial modal solution approach based on the finite element method is used to find the propagation properties of THz waveguides. Design approaches are presented to reduce the modal loss. Design of several THz devices, including quantum cascade lasers, plasmonic waveguides, power splitters and narrow-band filters are also presented. Keywords-THz waveguides; THz devices, finite ...

We present a technique to couple finite element and finite sphere discretizations. The finite elements and finite spheres are coupled with full displacement compatibility. We also present a technique in which a finite element discretization is enriched with finite spheres. We consider two-dimensional conditions and present solutions to illustrate the analysis procedures. 2005 Elsevier Ltd. All ...

Many practical finite element models contain long slender regions and areas where the thickness is small in relation to the other dimensions. The slender regions are best modelled using 1D beam elements, while shell or plate type elements should be used to represent any areas consisting of thin walls. These reduced element types are much more efficient than using full 3D continuum elements (whi...