in the present paper the linear oscillator in r3 with z =constanthas been considered. the aim is to determine the necessary conditions forthe persistence of periodic solutions under discontinuous perturbations. a newapproach based on a computational method has been used. at the end weapply our method on an example.

We propose an efficient model for the description of three-dimensional (3-D) evolution breaking water waves in nearshore region. A fundamental property is its intrinsic ability to account 3-D dynamics vorticity and energy dissipation induced by wave breaking. In particular, achieved through use mollified operators, approach similar spirit that adopted smoothed particle hydrodynamics. Further, s...

In this paper a space-averaged Navier–Stokes approach was deployed to simulate the wave propagation over coastal structures. The developed model is based on the smoothed particle hydrodynamic (SPH) method which is a pure Lagrangian approach and can handle large deformations of the free surface with high accuracy. In this study, the large eddy simulation (LES) turbulent model was coupled with th...

Wave attenuation performance is the prime consideration when designing any floating breakwater. For a 2D hydrodynamic analysis of breakwater, wave evaluated by transmission coefficient, which defined as ratio between transmitted height and incident height. 3D some researchers still adopted this evaluation approach with taken at surface point, while others used mean coefficient within area. This...

Recruitment is an important process in regulating many marine benthic communities and many studies have examined factors controlling the dispersal and distribution of larval immigrants. However, benthic species also have early post-settlement life-stages that are dramatically different from adult and larval stages. Predation on these stages potentially impacts measured recruitment and the benth...

One of the most important issues for Muslim philosophers is the continuous imaginal world and its relationship with the discontinuous imaginative faculty. The continuous imaginal world is a perceptive faculty of the soul known as the faculty of imagination. The discontinuous imaginative faculty is the order of the universe called the imaginal world, which Muslim philosophers have portrayed in a...