2,319 Matching Results

Search Results

prev Results: 49 - 72 next
open access

Multigroup formalism for evaluation of continuous slowing down theory parameters

Description: Continuous slowing down theory calculations have been found to yield significant discrepancies in the presence of strong absorption. An algorithm has been formulated for evaluating continuous slowing down theory parameters which should be applicable for cases with strong absorption. Excellent agreement with more precise calculations is obtained when the new parameters are used.
Date: January 1, 1975
Creator: Parvez, A. & Becker, M.
Partner: UNT Libraries Government Documents Department
open access

Preliminary evaluation of two-element optical concentrators for use in solar photovoltaic systems

Description: The objective of this program was: to evaluate for photovoltaic applications the use of the compound parabolic concentrator design as a field collector--in conjunction with a primary focusing concentrator. The primary focusing concentrator may be a parabolic reflector, an array of Fresnel mirrors, a Fresnel lens, or some other type; Select several candidate configurations of such compound systems (focusing concentrators/CPC field collectors); Perform an analytic evaluation of the technical perf… more
Date: June 30, 1975
Partner: UNT Libraries Government Documents Department
open access

Thermal properties. Period covered: October--December 1975

Description: The thermal decomposition investigation of PETN using an LX-13 type PETN was begun this quarter. Samples are being conditioned at 373, 353 and 333/sup 0/K and others will be conditioned at 393 and 383/sup 0/K. Data from five samples are reported. A series of chemical reactivity tests was made using PETN to determine if decomposition rates could be calculated from the results. The data fit a semilogarithmic plot of the gas evolved as a function of time reasonably well. The last of a series of HN… more
Date: January 1, 1975
Creator: Myers, L.C.
Partner: UNT Libraries Government Documents Department
open access

Study on reduction of accessory-horsepower requirements. Third quarterly progress report

Description: The objective of this study program is to minimize automotive accessory horsepower consumption, and thereby maximize overall vehicle fuel economy, by utilizing continuously variable speed drives or auxiliary power units (APUs) in a standard passenger automobile. As an aid to definitizing accessory performance, load requirements and fuel economy, a baseline vehicle has beeen established. This vehicle is a conventional intermediate size 5- or 6-passenger automobile with a 4.1 to 5.7 liter (250 to… more
Date: April 23, 1975
Partner: UNT Libraries Government Documents Department
open access

Correlation of mechanical and metallurgical parameters with the acoustic emission during tensile deformation of several metals and alloys

Description: Acoustic emission was monitored during plastic deformation under dead-weight tensile loading of polycrystalline aluminum, brass, copper, and steel. The acoustic emission data, both threshold-type and frequency-analysis type, were correlated with yield strength, stored elastic energy, strain hardening parameters, loading histories, diffusion processes, slip band motion and mosaic cell size. Major results are presented under the headings discontinuous yielding (Portevin--Le Chatelier Effect), par… more
Date: December 1, 1975
Creator: Hartman, W. F.
Partner: UNT Libraries Government Documents Department
open access

Laser fusion study. Final report

Description: The following appendices are included: (1) sensor performance calculation techniques, (2) focus sensing, (3) purchased item data, (4) pointing and focusing configuration tradeoff studies, (5) false start centering sensor, (6) RCA application notes on quad delection, (7) elliptical flex pivot analysis, (8) servo mirrors cross coupling, (9) optical misalignment analysis, (10) stress induced birefrigent quarter-wave retarder, (11) data bulletin on incramute damping alloy, (12) the utilization of s… more
Date: June 1, 1975
Partner: UNT Libraries Government Documents Department
Back to Top of Screen