in this study, boundary element method was used to model sea wave propagation on a hemisphere shape under water tank and oil-water common surface oscillation in the tank. also, kinematic and dynamic oundary conditions of free surface and common surface of oil and water were discritized by finite difference method. there were some singularities in bem method, which were removed by applying zonin...

A well-designed free-running oscillator provides a periodic signal of constant amplitude and frequency fo from the energy delivered by direct-current (dc) sources. This has an immediate application for the realization of local oscillators used in the frequency-conversion stages of communication systems [1]. In receivers, the modulated signal at radio-frequency (RF) fRF is mixed with the output ...

Aims. The main goal is to study the dynamics of the gravitationally stratified, field-free cavities in the solar atmosphere, located under small-scale, cylindrical magnetic canopies, in response to explosive events in the lower-lying regions (due to granulation, small-scale magnetic reconnection, etc.). Methods. We derive the two-dimensional Klein-Gordon equation for isothermal density perturba...

S 457 The currents flowing through region A and B generate spin waves which travel through the shared free layer, superimpose and cancel each other partially (z-components); resulting in a circular oscillation in the xy-

We expose a grave drawback hidden in the standard model of n¯ n transitions in a medium. Correcting it, one improves a limit on the free-space n¯ n oscillation time τ n¯ n by 31 orders of magnitude.