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Method of independent timesteps in the numerical solution of initial value problems

Description: In the numerical solution of initial-value problems in several independent variables, the timestep is controlled, especially in the presence of shocks, by a small portion of the logical mesh, what one may call the crisis zone. One is frustrated by the necessity of doing in the whole mesh frequent calculations required by only a small part of the mesh. It is shown that it is possible to choose different timesteps natural to different parts of the mesh and to advance each zone in time only as oft… more
Date: July 21, 1976
Creator: Porter, A. P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Picosecond x-ray spectral studies

Description: Temporally and spectrally resolved x-ray emission is an important diagnostic tool for the study of target heating and compression induced by sub-nanosecond laser pulses. The use of the Livermore 15 psec x-ray streak camera to record x-ray emissions in the 1-10 keV range is described. In particular, significant progress is reported during the past year in defining the camera as a quantitative diagnostic instrument, and its implementation for multi-channel, time resolved K-edge filter measurement… more
Date: July 21, 1976
Creator: Attwood, D. T. & Coleman, L. W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Theoretical tool movement required to diamond turn an off-axis paraboloid on axis

Description: Current techniques for manufacturing off-axis paraboloids are both expensive and insufficiently accurate. An alternative method, turning the workpiece about its axis on a diamond-turning machine, is presented, and the equations describing the necessary tool movement are derived. A discussion of a particular case suggests that the proposed technique is feasible.
Date: July 21, 1976
Creator: Thompson, D. C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Review of world experience and properties of materials for encapsulation of terrestrial photovoltaic arrays. Final report

Description: Available information defining the state of the art of encapsulation materials and processes for terrestrial photovoltaic devices and related applications were collected and analyzed. Based on criteria of properties, processability, availability, and cost, candidate materials were identified which have potential for use in encapsulation systems for low-cost, long-life terrestrial photovoltaic arrays manufactured by automated, high-volume processes. The criteria for consideration of the encapsul… more
Date: July 21, 1976
Creator: Carmichael, D. C.; Gaines, G. B.; Sliemers, F. A.; Kistler, C. W. & Igou, R. D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Ultraviolet probing of laser produced plasmas with picosecond pulses

Description: Technical photography, through such means as interferometry, Faraday rotation, and simple shadowgraphs, can provide significant data for understanding the absorption and transport of energy within laser produced plasmas. For plasmas produced by intense, sub-nanosecond Nd laser pulses, one is required to study electron densities in the 10/sup 20/ to 10/sup 21/ e/cc range, with density contour velocities of 10/sup 6/ to 10/sup 7/ cm/sec, and axial scale lengths of 1-20 ..mu..m. The relationship b… more
Date: July 21, 1976
Creator: Attwood, D. T. & Coleman, L. W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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