Soft gamma repeaters are identified as highly magnetized (B≈ 10 14 Gauss) neutron stars. Magnetic stresses induce tec-tonic activity, and field annihilation in faults is the ultimate energy source for the observed γ-ray emission. As a consequence of the crustal cracking, the stored elastic energy is converted into high frequency (kHz) shear waves, that excite nonradial oscillation modes damped ...

where φt x t−1φ x/t , ψt x t−1ψ x/t , and ∗ denotes the convolution on R. The Calderón reproducing formula is a useful tool in pure and applied mathematics see 1– 4 , particularly in wavelet theory see 5, 6 . We always call 1.1 an inverse formula of wavelet transform. In 7 , the authors generalized 1.1 to R when φ and ψ are sufficiently nice normalized radial wavelet functions. The generalizati...

We present a finite difference code intended for computing linear, adiabatic, nonradial pulsations of spherical stars. This code is based on a slight modification of the general Newton-Raphson technique in order to handle the relaxation of the eigenvalue (square of the eigenfrequency) of the modes and their corresponding eigenfunctions. This code has been tested computing the pulsation spectra ...

Mathematical programming is one of the areas to which fuq set theoq has been applied extensively. Primarily based on Bellman and Zadeh’s model of decision in fuzzy environments, models have been suggested which allow flexibility in constraints and nonlinear programming. Data envelopment analysis (DEA) is a method of evaluating relative efJiciencies for a group of similar units based on an efici...