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Quantitative non-destructive evaluation of high-temperature superconducting materials

Description: Even though the currently intensive research efforts on high- temperature superconducting materials have not yet converged on a well specified practical material, the indications are that such a material may be quite brittle, anisotropic, and may contain many flaws such as microcracks and voids at grain boundaries. Consequently, practical applications of high temperature superconducting materials will require a very careful strength analysis based on fracture mechanics considerations. Because o… more
Date: June 14, 1991
Creator: Achenbach, J. D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Quantitative non-destructive evaluation of high-temperature superconducting materials. Progress report, September 1, 1990--August 31, 1991

Description: Even though the currently intensive research efforts on high- temperature superconducting materials have not yet converged on a well specified practical material, the indications are that such a material may be quite brittle, anisotropic, and may contain many flaws such as microcracks and voids at grain boundaries. Consequently, practical applications of high temperature superconducting materials will require a very careful strength analysis based on fracture mechanics considerations. Because o… more
Date: June 14, 1991
Creator: Achenbach, J. D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Inherently safe nuclear-driven internal combustion engines

Description: A family of nuclear driven engines is described in which nuclear energy released by fissioning of uranium or plutonium in a prompt critical assembly is used to heat a working gas. Engine performance is modeled using a code that calculates hydrodynamics, fission energy production, and neutron transport self-consistently. Results are given demonstrating a large negative temperature coefficient that produces self-shutoff of energy production. Reduced fission product inventory and the self-shutoff … more
Date: June 14, 1991
Creator: Alesso, P.; Chow, Tze-Show; Condit, R.; Heidrich, J.; Pettibone, J. & Streit, R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

A high resolution detector for H{sup 0} {yields} {gamma}{gamma}

Description: SSC detectors represent a challenging departure, both in size and precision, from currently operating detectors. In this note we enumerate some of the benefits of using high magnetic fields both to simplify the detector and improve its resolution and sensitivity. We have chosen an arrangement optimized to search for the reaction H{sup 0} {yields} {gamma}{gamma}. The arrangement also has the excellent momentum resolution for muons and electrons considered critical for the discovery of such proce… more
Date: January 14, 1991
Creator: Atiya, M.S. & Kycia, T.F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

[An invitation to the 1991 Black Tie Dinner]

Description: An invitation to the 1991 Black Tie Dinner. The front of the invitation is brightly colored and shows that it is the tenth anniversary of the Black Tie Dinner. Important information is listed on the back of the invitation.
Date: September 14, 1991
Creator: Black Tie Dinner, Inc.
Item Type: Refine your search to only Text
Partner: UNT Libraries Special Collections
open access

An investigation of the effects of history dependent damage in time dependent fracture mechanics, Phase 1, constant load conditions. Progress report

Description: In the following section a brief review of constitutive models is presented along with the implications of using them in creep crack growth studies under variable loads. The model searched for this study, is discussed along with is special features that make is particularly suitable for this investigation. This model is based on the creep hardening surface and is particularly useful for variable and fully reversed load histories. In Section 3 an implicit finite element algorithm for this model … more
Date: November 14, 1991
Creator: Brust, F. W.; Krishnaswamy, P. & Ghadiali, N. D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

An investigation of the effects of history dependent damage in time dependent fracture mechanics, Phase 1, constant load conditions

Description: In the following section a brief review of constitutive models is presented along with the implications of using them in creep crack growth studies under variable loads. The model searched for this study, is discussed along with is special features that make is particularly suitable for this investigation. This model is based on the creep hardening surface and is particularly useful for variable and fully reversed load histories. In Section 3 an implicit finite element algorithm for this model … more
Date: November 14, 1991
Creator: Brust, F.W.; Krishnaswamy, P. & Ghadiali, N.D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Technology transfer from the space exploration initiative

Description: Space exploration has demonstrated that it stimulates the national economy by creating new and improved products, increased employment, and provides a stimulus to education. The exploration of the Moon and Mars under the Space Exploration Initiative has the potential of accelerating this stimulates to the economy. It is difficult to identify all of the concrete ways this will be accomplished. However, many areas can be identified. The space exploration building blocks of power, propulsion, spac… more
Date: June 14, 1991
Creator: Buden, D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Technology transfer from the space exploration initiative

Description: Space exploration has demonstrated that it stimulates the national economy by creating new and improved products, increased employment, and provides a stimulus to education. The exploration of the Moon and Mars under the Space Exploration Initiative has the potential of accelerating this stimulates to the economy. It is difficult to identify all of the concrete ways this will be accomplished. However, many areas can be identified. The space exploration building blocks of power, propulsion, spac… more
Date: June 14, 1991
Creator: Buden, D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Nuclear thermal rocket clustering: 1, A summary of previous work and relevant issues

Description: A general review of the technical merits of nuclear thermal rocket clustering is presented. A summary of previous analyses performed during the Rover program is presented and used to assess clustering in the context of projected Space Exploration Initiative missions. A number of technical issues are discussed including cluster reliability, engine-out operation, neutronic coupling, shutdown core power generation, shutdown reactivity requirements, reactor kinetics, and radiation shielding. 7 refs… more
Date: July 14, 1991
Creator: Buksa, J.J. & Houts, M.G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

The classical EMC effect from few-body systems to nuclear matter: Can binding effects explain it

Description: It is shown that if the effects of nucleon binding on deep inelastic scattering are considered within many-body realistic descriptions of nuclei which include nucleon-nucleon correlations, the EMC effect in light and medium weight nuclei and nuclear matter can be accounted for in the region 0.2 {le} x {le} 0.5, but a systematic discrepancy between theory and experiment remains to be explained for 0.5 {le} x {le} 0.9.
Date: May 14, 1991
Creator: Ciofi degli Atti, C. & Liuti, S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The classical EMC effect from few-body systems to nuclear matter: Can binding effects explain it?

Description: It is shown that if the effects of nucleon binding on deep inelastic scattering are considered within many-body realistic descriptions of nuclei which include nucleon-nucleon correlations, the EMC effect in light and medium weight nuclei and nuclear matter can be accounted for in the region 0.2 {le} x {le} 0.5, but a systematic discrepancy between theory and experiment remains to be explained for 0.5 {le} x {le} 0.9.
Date: May 14, 1991
Creator: Ciofi degli Atti, C. & Liuti, S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Rapid regulatory control of plant cell expansion and wall relaxation. Annual technical progress report

Description: The aim of this project is to elucidate the biophysical and cellular mechanisms that control plant cell expansion. At present we are attempting to characterize the kinetics of the system(s) responsible for regulatory and compensatory behavior of growing cells and tissues. This work is significantly because it indicates that biochemical loosening and biophysical stress relaxation of the wall are part of a feedback loop controlling growth. This report briefly summarizes the efforts and results of… more
Date: August 14, 1991
Creator: Cosgrove, D. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Rapid regulatory control of plant cell expansion and wall relaxation

Description: The aim of this project is to elucidate the biophysical and cellular mechanisms that control plant cell expansion. At present we are attempting to characterize the kinetics of the system(s) responsible for regulatory and compensatory behavior of growing cells and tissues. This work is significantly because it indicates that biochemical loosening and biophysical stress relaxation of the wall are part of a feedback loop controlling growth. This report briefly summarizes the efforts and results of… more
Date: August 14, 1991
Creator: Cosgrove, D.J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

PHIGS PLUS for scientific graphics

Description: This paper gives a brief overview of the use of computer graphics standards in the scientific community. It particularly details how how PHIGS PLUS meets the needs of users at the Lawrence Livermore National Laboratory. Although standards for computer graphics have improved substantially over the past decade, their acceptance in the scientific community has been slow. As the use and diversity of computers has increased, the scientific graphics libraries have not been able to keep pace with the … more
Date: January 14, 1991
Creator: Crawfis, R.A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

A sendmail. cf scheme for a large network

Description: Like most large networked sites our users depend heavily on the electronic mail system for both internal and off-site communications. Unfortunately the sendmail.cf file, which is used to control the behavior of the sendmail program, is somewhat cryptic and difficult to decipher for the neophyte. So, on one hand you have a highly visible, frequently used utility, and on the other hand a not-so-easily acquired system administration forte. Here is the sendmail topology of our site, what premises w… more
Date: August 14, 1991
Creator: Darmohray, T.M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Parameter selection for the SSC trade-offs and optimization

Description: In November of 1988, a site was selected in the state of Texas for the SSC. In January of 1989, the SSC Laboratory was established in Texas to adapt the design of the collider to the site and to manage the construction of the project. This paper describes the evolution of the SSC design since site selection, notes the increased concentration on the injector system, and addresses the rationale for choice of parameters.
Date: October 14, 1991
Creator: Edwards, D. A. & Syphers, M. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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