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Planar numerical cosmology. I. The differential equations

Description: This paper is the first in a series describing a method for evolving planar cosmological models on a computer. In this paper we set forth our coordinate conditions and variables, and discuss the way our special gauge simplifies the numerical evolution. We write down the Einstein equations that govern the gravitational field in our cosmologies, as well as the hydrodynamical equations for the fluid souces. Later papers in this series will present the differencing of these equations, tests of the … more
Date: August 1, 1982
Creator: Centrella, J. & Wilson, J. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Electron impact ionization of heavy ions: some surprises

Description: This paper reports the results of calculations of electron impact ionization cross sections for a variety of heavy ions using a distorted wave Born-exchange approximation. The target is described by a Hartree-Fock wavefunction. The scattering matrix element is represented by a triple partial wave expansion over incident, scattered, and ejected (originally bound) continuum states. These partial waves are computed in the potentials associated with the initial target (incident and scattered waves)… more
Date: August 22, 1986
Creator: Younger, S.M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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The development and evaluation of water-mist fire extinguishing systems

Description: Fire protection for underfloor space is primarily provided by Halon 1301 which has proven to be very effective. However, due to the link between halons and the possible depletion of the stratospheric ozone layer, plans have been implemented to eventually phase out Halon 1301 and 1211. In September 1987 the Montreal Protocol concerning chlorofluorocarbons (CFC) and halons was signed by the United States, the European Economic Community, and 23 other nations. The Montreal Protocol calls for freez… more
Date: August 1, 1994
Creator: Beason, D. G. & Staggs, K. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Dusty boundary layer in a surface-burst explosion

Description: Dusty boundary layers are an inherent feature of explosions over ground surfaces. Detailed knowledge of dusty boundary layer characteristics is needed in explosion safety analysis (e.g., to calculate the drag loads on structures). Also, to predicct the amount of dust in the rising fireball of an explsion, one must know the dusty boundary layer swept up during the positive and negative phases of the blast wave and how much of this boundary layer dust is entrained into the stem of the dust cloud.… more
Date: August 1, 1993
Creator: Kuhl, A. L.; Ferguson, R. E.; Chien, K. Y. & Collins, J. P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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DELPHI: An introduction to output layout and data content

Description: DELPHI was the data summary and interpretation code used by gas diagnostics personnel during the period from 1968 through 1986. It was written by Floyd Momyer, and went through several revisions during its period of use. Described here is the final version, which provided the most extensive set of summary tables. Earlier versions of the code lacked some of the capabilities of the final version, but what they did include was of substantially the same format. DELPHI was run against most available… more
Date: August 16, 1994
Creator: Smith, C. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Baroclinic mixing in HE fireballs

Description: Numerical simulations of the turbulent mixing in the fireball of an HE blast wave were performed with a second-order Godunov code. Adaptive mesh refinement was used to capture the convective mixing processes on the computational grid. The calculations revealed that the interface between the shock-compressed air and the dense detonation products was unstable. Vorticity was generated in that region by baroclinic effects. This caused the interface to roll-up into a turbulent mixing layer. Four pha… more
Date: August 1, 1993
Creator: Kuhl, A. L.; Ferguson, R. E.; Priolo, F.; Chien, K. Y. & Collins, J. P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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