rayleigh-taylor (rt) instability has a growing importance in many fields including aircraft industry and astrophysics. the development and the growth of rt instability were investigated using sinusoidal disturbances with different wavelength at the interface of two fluids. numerical simulations were performed by solving navier-stokes unsteady equations with the vof formulation. results of the 2...

Code-division multiple-access (CDMA) systems with random spreading and channel uncertainty at the receiver are studied. Frequency selective single antenna, as well as, narrowband multiple antenna channels are considered. Rayleigh fading is assumed in all cases. General Bayesian approach is used to derive both iterative and non-iterative estimators whose performance is obtained in the large syst...

Article history: Received 20 April 2010 Received in revised form 15 July 2010 Accepted 26 July 2010 Available online 3 August 2010 Communicated by P.R. Holland Using multiphoton entangled states, we demonstrate improving spatial imaging resolution beyond the Rayleigh diffraction limit in the quantum imaging process. In particular, we examine resolution enhancement using triphoton W state and a ...

By applying the Euler–Rayleigh method to a specific representation of Jacobi polynomials as hypergeometric functions, we obtain new bounds for their largest zeros. In particular, derive upper and lower bound $$1-x_{nn}^2(\lambda )$$ , with $$x_{nn}(\lambda being zero n-th ultraspherical polynomial $$P_n^{(\lambda )}$$ . For every fixed $$\lambda >-1/2$$ limit ratio our does not exceed 1.6. This...

We have carried out absolute calibrations of the LHD YAG Thomson scattering system by using Raman scattering and Rayleigh scattering in order to verify the applicability of Rayleigh calibration in the LHD Thomson scattering, and make a comparative study of Raman and Rayleigh calibrations. In the LHD Thomson scattering device, Rayleigh calibration is expected to give more reliable calibration fa...

We compare the angular expansion velocities, determined with VLBI, with the linear expansion velocities measured from optical spectra for supernova 1993J in the galaxy M81, over the period from 7 d to ∼9 yr after shock breakout. The high degree of isotropy of the radio shell’s expansion, within 5.5%, with the projection of the radio shell being circular within even 1.4%, and the consistency of ...

The present investigation deals with the propagation of Rayleigh wave in an incompressible medium bonded between two half-spaces. Variation in elastic parameters of the layer is taken linear form. The solution for layer and half-space are obtained analytically. Frequency equation for Rayleigh waves has been obtained. It is observed that the heterogeneity and width of the incompressible medium h...

Fresnel Incoherent Correlation Holography (FINCH) enables holograms to be recorded from incoherent light with just a digital camera and spatial light modulator. We previously described its application to general three dimensional incoherent imaging and specifically to fluorescence microscopy, wherein one complex hologram contains the three dimensional information in the field of view, obviating...

The dynamics of heat transfer in a model system Rayleigh-B\'enard (RB) convection reduced to its essential, here dubbed Burgers-Rayleigh-B\'enard (BRB), is studied. spatially one-dimensional, the flow field compressible and evolution described by Burgers equation forced an active temperature field. BRB shares some remarkable similarities with realistic RB thermal higher spatial dimensions: i) i...

During the last decade, various efforts have been undertaken to enhance the resolution of optical microscopes, mostly because of their importance in biological sciences. Herein, we describe a method to increase the resolution of fluorescence microscopy by illuminating the specimen with a mesh-like interference pattern of a laser source and electronic postprocessing of the images. We achieve 100...