If we assume that the velocity proole is an image that can be compressed greatly using wavelets, then a relatively smaller wavelet represented model can be equivalent to a larger physical model; we obtain the modiied Bleistein/Cohen (BC) inversion formulation by restricting the perturbation to the smaller wavelet represented model. The method demonstrates three important features: rst, the BC t...

in this paper, we studied effect of different parameters including density, viscosity, interfacial tension and solute transfer concentration on phase inversion hold-up. the results showed that change in phase density ratio had no effect on phase inversion hold-up. it also disclosed that the phase viscosity ratio was the most effective parameter affecting phase inversion hold-up and each phase h...

Missing trace reconstruction is a challenge in seismic processing due to incomplete and irregular acquisition. Noise is a concern, due to the many sources of noise that occur during seismic acquisition. Most of the recent research on denoising and interpolation focuses on transform domain approaches using L1 norm minimization. A specific kind of constraint, called the synthesis approach, is wid...

In recent years Rayleigh waves have been used increasingly as a nondestructive tool to obtain near-surface S-wave velocity, one of the key parameters in environmental and engineering applications (Miller et al., 1999a, 1999b; Park et al., 1998, 1999; Xia et al., 1999, 2003; Foti et al., 2002; Beaty and Schmitt, 2003; Tian et al., 2003; Zhang and Chan, 2003; Lin and Chang, 2004; O’Neill et al., ...

introduction air pollution as one of the most important technological risks of contemporary era is mainly resulted from the emergence of large cities and fast growing industries. one of the main objectives of climatic and environmental studies is to survey atmospheric pollutions. tabriz is one of the metropolises where air pollution is a problem in it. of course, what is essential regarding the...

The asymptotic behaviour, with respect to the large order, of radii starlikeness two types normalised Bessel functions is considered. We derive complete expansions for and provide recurrence relations coefficients these expansions. proofs rely on notion Rayleigh sums inversion. techniques employed in paper could be useful treat similar problems where inversion involved.

We discuss methods to compute error bounds for extremely ill-conditioned problems. As a model problem we treat matrix inversion. We demonstrate that additive corrections to improve an approximate inverse are useful for ill-conditioned problems, but hardly usable for extremely ill-conditioned problems. Here multiplicative corrections can be used, including the possibility to compute guaranteed e...

This thesis focuses on two distinct, yet complementary topics. First, I examine the use of observed gradient and total-field data acquired from aeromagnetic surveys as independent data sets for quantitative interpretation. Second, I develop a more efficient means of processing and inverting these large data sets. The first topic stems from the recent use of multiple magnetometers, which allows ...