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Now showing items 1-10 of 169

#### Lithospheric structure of the Chaco and Parana Basins of South America from surface-wave inversion

(American Geophysical Union, 1997-02)

Surface-wave data from a portable broadband array have been used to invert for the velocity structure of the crust and upper mantle beneath the Chaco and Parana Basins of central South America. The upper-mantle velocity ...

#### Asymptotic-behavior of Jost functions near resonance points for Wigner-Vonneumann type potentials

(AIP Publishing, 1991-01)

In this work are considered radial Schrodinger operators - psi" + V(r)-psi = E-psi, where V(r) = a sin br/r + W(r) with W(r) bounded, W(r) = O(r-2) at infinity (a,b real). The asymptotic behavior of the Jost function and ...

#### Raman-scattering and optical studies of argon-etched GaAs surfaces

(American Physical Society, 1991-04)

We have studied the structual damage in low-energy argon-ion-bombarded (ion-etched) GaAs using Raman scattering and ultraviolet reflectivity. When combined with post-bombardment sequential chemical etching, the Raman results ...

#### Computational simulation of type-II superconductivity including pinning phenomena

(American Physical Society, 1995-06-15)

A flexible tool, based on the finite-element method, for the computational simulation of vortex phenomena in type-II superconductors has been developed. These simulations use refined or newly developed phenomenological ...

#### t-J model studied by the power Lanczos method

(American Physical Society, 1995-03)

The initial trial wave function used in a simple ground-state projection method, the power method, is systematically improved by using Lanczos algorithm. Much faster convergence to the ground state achieved by using these ...

#### Wave scattering in one dimension with absorption

(AIP Publishing, 1998-04)

Wave scattering is analyzed in a one-dimensional nonconservative medium governed by the generalized Schrodinger equation d(2) psi/dx(2)+k(2) psi=[ikP(x)+Q(x)]psi, where P(x) and Q(x) are real, integrable potentials with ...

#### On the Levinson theorem for Dirac operators

(AIP Publishing, 1990-01)

For the Dirac equation with potential V(r) obeying ∫∞ 0(1+r)‖V(r)‖d r<∞ we prove a relativistic version of Levinson’s theorem that relates the number of bound states in the spectral gap [−m,m] to the variation of an ...

#### Effect of multiple scattering on transition radiation from a dynamic interface

(American Physical Society, 1991-09)

The effect of multiple scattering (long-range, small-angle elastic Coulomb collisions) on the radiation field associated with transition radiation from a nonstationary plasmalike medium is addressed with the help of a ...

#### Origin of scintillation in cerium_doped oxide crystals

(AIP Publishing, 1995-05)

We propose here a model of the scintillation from complex oxide single crystalsdoped with Ce3+ ions to explain the correlation observed between scintillation light yield and intrinsic luminescence of the matrix.

#### Long nonlinear waves in an unbounded rotating jet or rotating two-fluid flow

(AIP Publishing, 1994-03)

The objective of this paper is to study weakly nonlinear waves in an infinitely long rotating jet and a rotating two-fluid flow bounded by an infinitely long rigid cylinder with surface tension at the interface. The critical ...