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open access

Nuclear structure calculations for astrophysical applications

Description: Here we present calculated results on such diverse properties as nuclear energy levels, ground-state masses and shapes, {beta}-decay properties and fission-barrier heights. Our approach to these calculations is to use a unified theoretical framework within which the above properties can all be studied. The results are obtained in the macroscopic-microscopic approach in which a microscopic nuclear-structure single-particle model with extensions is combined with a macroscopic model, such as the l… more
Date: March 13, 1992
Creator: Moeller, P.; Kratz, K.L. (Mainz Univ. (Germany). Inst. fuer Kernchemie) & Nix, J.R. (Los Alamos National Lab., NM (United States))
Partner: UNT Libraries Government Documents Department
open access

Nuclear structure calculations for astrophysical applications

Description: Here we present calculated results on such diverse properties as nuclear energy levels, ground-state masses and shapes, {beta}-decay properties and fission-barrier heights. Our approach to these calculations is to use a unified theoretical framework within which the above properties can all be studied. The results are obtained in the macroscopic-microscopic approach in which a microscopic nuclear-structure single-particle model with extensions is combined with a macroscopic model, such as the l… more
Date: March 13, 1992
Creator: Moeller, P.; Kratz, K. L. & Nix, J. R.
Partner: UNT Libraries Government Documents Department
open access

A time-frequency smoothing algorithm for cyclic spectral analysis

Description: A hybrid smoothing algorithm is described that smooths first in time and then in frequency. The time-frequency smoothing algorithm is designed to compute estimates of the cyclic (cross) spectrum along lines of constant cycle frequency. A variation on the algorithm, one that incorporates the One Bit Spectral Correlation Algorithm (OBSCA), is also described. A simulation study is presented that evaluates the algorithms.
Date: August 13, 1992
Creator: Roberts, R. S.
Partner: UNT Libraries Government Documents Department
open access

Environmental Restoration Program Control Management System

Description: Environmental Restoration managers need to demonstrate that their programs are under control. Unlike most industrial programs, the public is heavily involved in Environmental Restoration activities. The public is demanding that the country prove that real progress is being made towards cleaning up the environment. A Program Control Management System can fill this need. It provides a structure for planning, work authorization, data accumulation, data analysis and change control. But it takes tim… more
Date: August 13, 1992
Creator: Duke, R. T.
Partner: UNT Libraries Government Documents Department
open access

Environmental Restoration Program Control Management System

Description: Environmental Restoration managers need to demonstrate that their programs are under control. Unlike most industrial programs, the public is heavily involved in Environmental Restoration activities. The public is demanding that the country prove that real progress is being made towards cleaning up the environment. A Program Control Management System can fill this need. It provides a structure for planning, work authorization, data accumulation, data analysis and change control. But it takes tim… more
Date: August 13, 1992
Creator: Duke, R. T.
Partner: UNT Libraries Government Documents Department
open access

Two perspectives on a decohering spin

Description: I study the quantum mechanics of a spin interacting with an environment. Although the evolution of the whole system is unitary, the spin evolution is not. The system is chosen so that the spin exhibits loss of quantum coherence, or wavefunction collapse,'' of the sort usually associated with a quantum measurement. The system is analyzed from the point of view of the spin density matrix (or Schmidt path''), and also using the consistent histories (or decoherence functional) approach.
Date: February 13, 1992
Creator: Albrecht, Andreas
Partner: UNT Libraries Government Documents Department
open access

Two perspectives on a decohering spin

Description: I study the quantum mechanics of a spin interacting with an environment. Although the evolution of the whole system is unitary, the spin evolution is not. The system is chosen so that the spin exhibits loss of quantum coherence, or ``wavefunction collapse,`` of the sort usually associated with a quantum measurement. The system is analyzed from the point of view of the spin density matrix (or ``Schmidt path``), and also using the consistent histories (or decoherence functional) approach.
Date: February 13, 1992
Creator: Albrecht, Andreas
Partner: UNT Libraries Government Documents Department
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