Rational approximation of P-wave kinematics — Part 2: Orhorhombic media

Rational Approximation to Full-Wave Modeling of Underground Cables

The full-wave model of underground cables is presented. The solutions of this model in frequency domain, applied in underground insulated, cable is evaluated. To allow the inclusion of this formulation in EMT programs a rational vector fitting of the propagation constant, characteristic admittance Yc and the propagation function H in frequency domain is presented. The simulations in time domain...

A Complex Coe cient Rational Approximation of p 1 + xYa

Rational approximations of p 1 + x are useful for one-way wave propagation modeling, where a square root operator must be approximated. The standard Pad e approximants incorrectly propagate the evanescent modes corresponding to x < ?1. A modiication of the Pad e approximation is introduced in this paper. Our new approximants have positive real imaginary parts for x < ?1, which give the evanesce...

2-D Surface Wave Tomography in the Northwest Part of the Iranian Plateau

In this study, we obtained two-dimensional tomography maps of the Rayleigh wave group velocity for the northwest part of the Iranian Plateau in order to investigate the structure of the crust and the uppermost mantle of NW Iran. To do this, the local earthquake data during the period 2006-2013, recorded by the 10 broadband stations of the Iranian seismic network (INSN) were used. After the prel...

Rational Approximation

Recently several authors have investigated the question of approximating certain functions by reciprocals of polynomials under the uniform norm on the positive real axis . Perhaps these results have some applications in industry and elsewhere (cf. [1, 36]) . Our present motivation is to give a detailed list of all the known results with simplified proofs in some cases and many new results and f...

The Moliere Approximation for Wave Propagation in Turbulent Media