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Influence of peak pressure on the substructure evolution and shock wave profiles of Ti-6Al-4V
The object of the present study was to investigate the infleunce of peak pressure on the residual structureproperty relationships and the wave profile behavior of shock-loaded Ti-6-4. A further aim of the present work was to determine if the alpha to omega phase transformation occurred in Ti-6-4 using /open quotes/real time/close quotes/ VISAR and post-mortem shock recovery techniques. The following conclusions can be drawn: over the velocity range investigated no evidence of an alpha to omega phase transition was observed in Ti-6-4 with either VISAR wave profiles or shock recovery experiments; increasing peak pressure results in an increased dislocation density and yield strength in shock-loaded Ti-6-4; deformation of the (1121) type, are observed in the 10 and 13 GPa; the low pressure Hugoniot for Ti-6-4 is given by U/sub s/ = 5.123 kms + 1.083 U/sub p/ for U/sub p/ < 1.4 kms; the high pressure relation is given by U/sub s/ = 5.030 + 1.056 U/sub p/. 9 refs., 5 figs.
Date:
January 1, 1988
Creator:
Gray, G. T., III & Morris, C. E.
Object Type:
Article
System:
The UNT Digital Library
Extension of Experiment 756 into the Next Running Period
Prior to E756, no one had ever produced a polarized {Omega}{sup -} beam. Thus the authors first proposed to try the 'standard method'. If the {Omega}{sup -}s were polarized, the experiment was designed to yield an error of less than 0.1 n.m. for the magnetic moment. They proposed to carry out a polarization analysis while data was being taken to determine the course of the experiment. If protons did not produce polarized {Omega}{sup -}s, they had devised alternative methods to produce the desired polarized sample. During the 1987-88 fixed target run, the experiment proceeded as outlined in the proposal. Using a minimal statistically significant sample, they found the polarization of {Omega}{sup -}'s produced directly by protons to be insufficient to accomplish the measurement. This result is in itself a major contribution to the understanding of the phenomena of inclusive hyperon polarization. In addition to the polarization results, this period of the experiment will yield the best measurement of the cascade minus magnetic moment (better than 1%), the best measurement of the weak decay parameter, {alpha}, for both the {Omega}{sup -} and the {Xi}{sup -}, and the best measurement of the lifetime of both the {Omega}{sup -} and the {Xi}{sup -}. …
Date:
January 1, 1988
Creator:
Johns, Kenneth A. & Rameika, Regina A.
Object Type:
Report
System:
The UNT Digital Library
Fast wave current drive: Experimental status and reactor prospects
The fast wave is one of the two possible wave polarizations which propagate according to the basic theory of cold plasmas. It is distinguished from the other (slow wave) branch by having an electric field vector which is mainly orthogonal to the confining magnetic field of the plasma. The plasma and fast wave qualitatively assume different behavior depending on the frequency range of the launched wave. The high frequency fast wave (HFFW), with a frequency (..omega..2..pi.. )approximately) GHz) much higher than the ion cyclotron frequency (..cap omega../sub i/), suffers electron Landau damping and drives current by supplying parallel momentum to superthermal electrons in a fashion similar to lower hybrid (slow wave) current drive. In the simple theory the HFFW should be superior to the slow wave and can propagate to very high density and temperature without impediment. Experiments, however, have not conclusively shown that HFFW current drive can be achieved at densities above the slow wave current drive limit, possibly due to conversion of the launched fast waves into slow waves by density fluctuations. Alternatively, the low frequency fast wave (LFFW), with frequencies ()approxreverse arrowlt) 100 MHz) only a few times the ion cyclotron frequency, is damped by electron Landau …
Date:
March 1, 1988
Creator:
Ehst, D.A.
Object Type:
Report
System:
The UNT Digital Library
Double prompt photon production at high transverse momentum by /pi//sup /minus// on protons at 280 GeV/c
A search for pairs of high p/sub T/ prompt photons produced in hydrogen by a 280 GeV/c incident /pi//sup /minus// beam has been carried out using a fine-grained electromagnetic calorimeter and the Omega spectrometer at the CERN SPS. Clear evidence for the existence of such events is found with a six standard deviation signal for p/sub T/ > 3.0 GeV/c. The cross sections are consistent with beyond leading order QCD calculations. A discussion on the determination of /alpha//sub s/ is also presented. 18 refs., 7 figs., 7 tabs.
Date:
June 1, 1988
Creator:
Bonvin, E.; Bopp, R.; Carroll, L. J.; Cass, A. J.; Chung, S. U.; Donnat, M. et al.
Object Type:
Article
System:
The UNT Digital Library
Fusion Energy Division: Annual progress report, period ending December 31, 1987
The Fusion Program of Oak Ridge National Laboratory (ORNL), a major part of the national fusion program, carries out research in nearly all areas of magnetic fusion. Collaboration among staff from ORNL, Martin Marietta Energy Systems, Inc., private industry, the academic community, and other fusion laboratories, in the United States and abroad, is directed toward the development of fusion as an energy source. This report documents the program's achievements during 1987. Issued as the annual progress report of the ORNL Fusion Energy Division, it also contains information from components of the Fusion Program that are external to the division (about 15% of the program effort). The areas addressed by the Fusion Program include the following: experimental and theoretical research on magnetic confinement concepts, engineering and physics of existing and planned devices, development and testing of diagnostic tools and techniques in support of experiments, assembly and distribution to the fusion community of databases on atomic physics and radiation effects, development and testing of technologies for heating and fueling fusion plasmas, development and testing of superconducting magnets for containing fusion plasmas, and development and testing of materials for fusion devices. Highlights from program activities are included in this report. 126 figs., 15 …
Date:
November 1, 1988
Creator:
Morgan, O. B., Jr.; Berry, L. A. & Sheffield, J.
Object Type:
Report
System:
The UNT Digital Library
Environmental surveillance at Los Alamos during 1987
This report describes the environmental surveillance program conducted by Los Alamos National Laboratory during 1987. Routine monitoring for radiation and radioactive or chemical materials is conducted on the Laboratory site as well as in the surrounding region. Monitoring results are used to determine compliance with appropriate standards and to permit early identification of potentially undesirable trends. Results and interpretation of data for 1987 cover: external penetrating radiation; quantities of airborne emissions and liquid effluents; concentrations of chemicals and radionuclides in ambient air, surface and ground waters, municipal water supply, soils and sediments, and foodstuffs; and environmental compliance. Comparisons with appropriate standards, regulations, and background levels provide the basis for concluding that environmental effects from Laboratory operations are insignificant and do not pose a threat to the public, Laboratory employees, or the environment. 113 refs., 33 figs., 120 tabs.
Date:
May 1, 1988
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Reports to the DOE Nuclear Data Committee
The report in this document were submitted to the Department of Energy, Nuclear Data Committee (DOE-NDC) in April 1988. The reporting laboratories are those with a substantial program for the measurement of neutron and nuclear cross sections of relevance to the US applied nuclear energy program. Appropriate subjects are microscopic neutron cross sections relevant to the nuclear energy program, including shielding. Inverse reactions where pertinent are included; charged-particle cross sections where relevant to developing and testing nuclear models; gamma ray production, radioactive decay, and theoretical developments in nuclear structure which are applicable to nuclear energy programs; and proton and alpha-particle cross sections, at energies of up to 1 GeV, which are of interest to the space program.
Date:
May 1, 1988
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
The Totem, Yearbook of McMurry College, 1988
Yearbook for McMurry College in Abilene, Texas includes photos of and information about the college, student body, professors, and organizations. Name index starts on page 214.
Date:
1988
Creator:
McMurry College
Object Type:
Yearbook
System:
The Portal to Texas History
TXWECO, Yearbook of Texas Wesleyan College, 1988
Yearbook for Texas Wesleyan College in Fort Worth, Texas, which includes photographs of and information about the school, administration, student body, faculty, and organizations.
Date:
1988
Creator:
Texas Wesleyan College
Object Type:
Yearbook
System:
The Portal to Texas History
The Bronco, Yearbook of Hardin-Simmons University, 1988
Yearbook for Hardin-Simmons University in Abilene, Texas includes photos of and information about the university, student body, professors, and organizations.
Date:
1988
Creator:
Hardin-Simmons University
Object Type:
Yearbook
System:
The Portal to Texas History
The Yellow Jacket (Brownwood, Tex.), Vol. 76, No. 6, Ed. 1, Friday, October 21, 1988
Weekly student newspaper from Howard Payne University in Brownwood, Texas that includes local, state and campus news along with advertising.
Date:
October 21, 1988
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The J-TAC (Stephenville, Tex.), Ed. 1 Thursday, October 20, 1988
Weekly student newspaper from Tarleton State University in Stephenville, Texas that includes local, state and campus news along with advertising.
Date:
October 20, 1988
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The J-TAC (Stephenville, Tex.), Ed. 1 Thursday, January 14, 1988
Weekly student newspaper from Tarleton State University in Stephenville, Texas that includes local, state and campus news along with advertising.
Date:
January 14, 1988
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
University Press (Beaumont, Tex.), Vol. 64, No. 26, Ed. 1 Friday, February 12, 1988
Semiweekly newspaper from Lamar University in Beaumont, Texas that includes local, national, and campus news along with advertising.
Date:
February 12, 1988
Creator:
Ford, Steven
Object Type:
Newspaper
System:
The Portal to Texas History
The Optimist (Abilene, Tex.), Vol. 75, No. 45, Ed. 1, Friday, February 26, 1988
Bi-weekly student newspaper from Abilene Christian University in Abilene, Texas that includes local, state and campus news along with advertising.
Date:
February 26, 1988
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Reata (Abilene, Tex.), November 1988
Monthly student magazine published by the newspaper staff of Hardin-Simmons University. According to page 2, "The Reata of Hardin-Simmons University is a special edition newspaper published on special occasions during the long term. It is published under the direction of the Department of Communication, Hardin-Simmons University, Abilene, Texas 79698, serving as a laboratory project and, to some extent, a forum of student views."
Date:
November 4, 1988
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Megaphone (Georgetown, Tex.), Vol. 83, No. 13, Ed. 1 Thursday, December 8, 1988
Weekly student newspaper from Southwestern University in Georgetown, Texas that includes campus news along with advertising.
Date:
December 8, 1988
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Optimist (Abilene, Tex.), Vol. 75, No. 43, Ed. 1, Sunday, February 21, 1988
Bi-weekly student newspaper from Abilene Christian University in Abilene, Texas that includes local, state and campus news along with advertising.
Date:
February 21, 1988
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Range Rider, Volume 39, Number 4, Winter 1988
The Hardin-Simmons alumni newsletter includes information regarding events at the school and news about university students, staff, and alumni.
Date:
1988
Creator:
Hardin-Simmons University
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
The Optimist (Abilene, Tex.), Vol. 75, No. 51, Ed. 1, Friday, April 1, 1988
Bi-weekly student newspaper from Abilene Christian University in Abilene, Texas that includes local, state and campus news along with advertising.
Date:
April 1, 1988
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Rambler (Fort Worth, Tex.), Vol. 63, No. 14, Ed. 1 Thursday, March 3, 1988
Weekly student newspaper from Texas Wesleyan College in Fort Worth, Texas that includes campus and local news along with advertising.
Date:
March 3, 1988
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Rambler (Fort Worth, Tex.), Vol. 64, No. 8, Ed. 1 Thursday, November 10, 1988
Weekly student newspaper from Texas Wesleyan College in Fort Worth, Texas that includes campus and local news along with advertising.
Date:
November 10, 1988
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Yellow Jacket (Brownwood, Tex.), Vol. 75, No. 23, Ed. 1, Friday, April 15, 1988
Weekly student newspaper from Howard Payne University in Brownwood, Texas that includes local, state and campus news along with advertising.
Date:
April 15, 1988
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
University Press (Beaumont, Tex.), Vol. 65, No. 12, Ed. 1 Friday, October 21, 1988
Semiweekly newspaper from Lamar University in Beaumont, Texas that includes local, national, and campus news along with advertising.
Date:
October 21, 1988
Creator:
Hawn, Evelyn
Object Type:
Newspaper
System:
The Portal to Texas History