Doppler sonography of 29 extracranial carotid arteries was performed twice within three days or less. Angiography revealed stenoses with from 10 to 95% diameter reduction in 25 internal carotid arteries whereas four vessels were found to be normal. The systolic peak frequency of the internal carotid artery read from the Doppler spectrum (n = 29) could be reproduced very well. This was shown by ...

We apply the nonlinear generalized Rayleigh quotients method to develop new tools that can be used study ground states of Schrödinger equations. introduce a type variational functional, global minimizer which corresponds so-called fundamental frequency solutions with prescribed action value. find state problem and uniquely determine corresponding values mass, frequency, level. Based on this app...

The governing equations of a transversely isotropic dissipative medium are solved analytically to obtain the surface wave solutions. The appropriate solutions satisfy the required boundary conditions at the stress-free surface to obtain the frequency equation of Rayleigh wave. The numerical values of the non-dimensional speed of Rayleigh wave speed are computed for different values of frequency...

1 2 Abstract The spectrum of Single Mode Laser pulses generated by fast Pseudo Random Word Modulation is studied numerically for Return-to-Zero and Non-Return-to-Zero control signals. We analyze both statistics and the worst cases for the frequency chirp during each optical pulse, and we study the connection between these frequency chirps and the turn-on times. We show that patterns in the modu...

The evaluation of the meteorological drought is fundamental for management water resource. One most used indices to evaluate standardized precipitation index (SPI) due its practicality and in a variety time scales, however, this uses as only variable, depending on deviations values. This important when evaluating SPI, because some ecosystems close equatorial zone, there are very warm periods wi...

the drawing of frequency-path (f-p) models of optical beams is an approach for nonlinearity analysis in nano-metrology systems and sensors based on the laser interferometers. in this paper, the frequency-path models of four nano-metrology laser interferometry systems are designed, analyzed and simulated, including conventional and modified two- and three-longitudinal-mode laser interferometers....