1,111 research outputs found
Project for the analysis of technology transfer Quarterly evaluation report, 1 Jan. - 31 Mar. 1969
Technology transfer analysis project studying nonspace applications of NASA and AEC generated technolog
Nonequilibrium effects of anisotropic compression applied to vortex lattices in Bose-Einstein condensates
We have studied the dynamics of large vortex lattices in a dilute-gas
Bose-Einstein condensate. While undisturbed lattices have a regular hexagonal
structure, large-amplitude quadrupolar shape oscillations of the condensate are
shown to induce a wealth of nonequilibrium lattice dynamics. When exciting an m
= -2 mode, we observe shifting of lattice planes, changes of lattice structure,
and sheet-like structures in which individual vortices appear to have merged.
Excitation of an m = +2 mode dissolves the regular lattice, leading to randomly
arranged but still strictly parallel vortex lines.Comment: 5 pages, 6 figure
Project for the analysis of technology transfer Quarterly report, 1 Jul. - 30 Sep. 1969
Research activities in technology transfer progra
Project for the analysis of technology transfer Quarterly report, 1 Oct. - 31 Dec. 1969
Analysis of Tech Brief-Technical Support Package progra
Potentials for which the Radial Schr\"odinger Equation can be solved
In a previous paper, submitted to Journal of Physics A -- we presented an
infinite class of potentials for which the radial Schr\"odinger equation at
zero energy can be solved explicitely. For part of them, the angular momentum
must be zero, but for the other part (also infinite), one can have any angular
momentum. In the present paper, we study a simple subclass (also infinite) of
the whole class for which the solution of the Schr\"odinger equation is simpler
than in the general case. This subclass is obtained by combining another
approach together with the general approach of the previous paper. Once this is
achieved, one can then see that one can in fact combine the two approaches in
full generality, and obtain a much larger class of potentials than the class
found in ref. We mention here that our results are explicit, and when
exhibited, one can check in a straightforward manner their validity
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