## Search

Now showing items 1-10 of 54

#### Processing spatially aliased arrays

(Acoustical Society of America, 1978-09)

A linear array can detect a plane wave signai at a wrong bearing if the signal wavelengths are shorter than twice the distance between the closest adjacent sensors. This penomenon, called spatial aliasing, is most pronounced ...

#### Direct phase determination in crystallography

(American Physical Society, 1976-12)

It was shown theoretically that through the diffraction of two coherent beams, one is able to measure both the magnitude and phase of the structure factor directly. Here some experimental comments concerning the performance ...

#### multiple-scales space-time analysis of a randomly perturbed one-dimensional wave-equation

(AIP Publishing, 1977-10)

An initial value problem for one_dimensional wave propagation is considered; the medium is assumed to be randomly perturbed as a function of both space and time. The stochastic perturbation theory of Papanicolaou and Keller ...

#### expansion-free electromagnetic solutions of Kerr-Schild class

(AIP Publishing, 1974-07)

Starting with the general Kerr_Schild form of the metric tensor,d s2=_+l_l (where l is null and _ is flat space_time), a study is made for those solutions of the Einstein_Maxwell equations in which l is geodesic, shear_free, ...

#### functional calculus for symmetric multigroup transport operator

(AIP Publishing, 1976-02)

A rigorous treatment of the symmetric multigroup transport equation is given by developing the functional calculus for the transport operator. Von Neumann spectral theory is applied to nonorthogonal cyclic subspaces, and ...

#### scattering of two coherent beams by multiple centers

(American Physical Society, 1974-09)

This is a continuation in the theoretical study of scattering initiated by two coherent beams. Here the scattering by multiple independent centers is discussed. The presence of these centers involves some problems, which ...

#### spheroidal analysis of Coulomb scattering

(AIP Publishing, 1974-05)

In studying the spheroidal problem of a charged particle scattered by two charged centers, we have had to deal with a differential equation. Its solution was complicated. In this paper, we study a very similar differential ...

#### Vlasov theory of plasma oscillations: linear-approximation

(AIP Publishing, 1977)

A functional analytic approach to the linearized collisionless Vlasov equation is presented utilizing a resolvent integration technique on the resolvent of the transport operator evaluated at a particular point. Formulae ...

#### solution of multigroup transport equation in Lp spaces

(AIP Publishing, 1976-11)

The isotropic multigroup transport equation is solved in L p , p_1, for both half range and full range problems, using resolvent integration techniques. The connection between these techniques and a spectral decomposition ...

#### Case eigenfunction expansion for a conservative medium

(AIP Publishing, 1976-02)

By using the resolvent integration technique introduced by Larsen and Habetler, the one‐speed, isotropic scattering,neutron transport equation is treated in the infinite and semi‐infinite media. It is seen that the results ...