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Absolute measurement of the critical scattering cross section in cobalt
Small-angle neutron scattering techniques have been used to study the angular distribution of the critical scattering from cobalt above T/sub c/. These measurements have been put on an absolute scale by calibrating the critical scattering directly against the nuclear incoherent scattering from cobalt. In this way the interaction range r$sub 1$, which appears in the classical and modified Ornstein--Zernike expressions for the asymptotic form of the spin pair correlation function and is related to the strength of the spin correlations, has been determined. We obtain r$sub 1$/a = 0.46 +- 0.03 for the ratio of the interaction range to the nearest-neighbor distance in cobalt. This result is in good agreement with theoretical predictions. Lack of agreement among previous determinations of the ratio r$sub 1$/a made in iron failed to provide a definitive comparison with theory. (auth)
Date:
January 1, 1975
Creator:
Glinka, C. J.; Minkiewicz, V. J. & Passell, L.
Object Type:
Article
System:
The UNT Digital Library
Absorption and luminescence of glasses during electron irradiation
None
Date:
January 1, 1975
Creator:
Swyler, K. J.; Hardy, W. H., II & Levy, P. W.
Object Type:
Article
System:
The UNT Digital Library
Acceleration of polarized protons to multi-GeV energies and experiments with polarized protons from 2 to 6 GeV/c
None
Date:
January 1975
Creator:
Ratner, L. G.
Object Type:
Article
System:
The UNT Digital Library
Acceleration techniques for response matrix methods
Application of the power iteration method to the multigroup response matrix equations reduces them to a series of one-group problems. Applying acceleration techniques to each of these monoenergetic problems results in substantial reductions in computational effort. The use of point over-relaxation methods in the solution of these equations is described. Over-relaxation is also applied to the outer-iteration eigenvalue and source estimations with considerable success. 10 references. (auth)
Date:
January 1, 1975
Creator:
Sicilian, J. M. & Pryor, R. J.
Object Type:
Article
System:
The UNT Digital Library
Accelerators for heavy ions
None
Date:
January 1, 1975
Creator:
Martin, J. A.
Object Type:
Article
System:
The UNT Digital Library
Acoustic detection of momentum transfer during the abrupt transition from a laminar to a turbulent atmospheric boundary layer
Acoustic sounder measurements of a vertical profile of the abrupt transition from a laminar to a turbulent atmospheric boundary layer were compared with meteorological measurements made at 10 m and 137 m on an instrumented tower. Sounder data show that conditions necessary for onset of the momentum burst phenomenon exist sometime during a clear afternoon when heat flux changes sign and the planetary surface cools. Under these conditions, the lowest part of the atmospheric boundary layer becomes stable. Prior to this situation, the entire boundary layer is in turbulent motion from surface heating. The boundary layer is then an effective barrier for all fluxes, and as the maximum flux Richardson number is reached at some height close to but above the surface, turbulence is dampened and a laminar layer forms. The profile of this layer is recorded by the sounder. Surface temperature drops, a strong wind shear develops, and the Richardson number decreases below its critical value (Ri/sub CR/ less than 0.25). Subsequently, the laminar layer is eroded by turbulence from above, and with a burst of momentum and heat, it eventually reaches the ground.
Date:
January 1, 1975
Creator:
Schubert, J. F.
Object Type:
Article
System:
The UNT Digital Library
Acoustic emission from thermal-gradient cracks in UO$sub 2$
A feasibility study has been conducted to evaluate the potential use of acoustic emission to monitor thermal-shock damage in direct electrical heating of UO$sub 2$ pellets. In the apparatus used for the present tests, two acoustic- emission sensors were placed on extensions of the upper and lower electrical feedthroughs. Commercially available equipment was used to accumulate acoustic- emission data. The accumulation of events displayed on a cathode-ray-tube screen indicates the total number of acoustic-emission events at a particular location within the pellet stack. These tests have indicated that acoustic emission can be used to monitor thermal-shock damage in UO$sub 2$ pellets subjected to direct- electrical heating. 8 references. (auth)
Date:
January 1, 1975
Creator:
Kennedy, C. R.; Kupperman, D. S. & Wrona, B. J.
Object Type:
Article
System:
The UNT Digital Library
Acquisition of the ANL 4-MeV Electrostatic Accelerator. Progress Report, September 1, 1974--August 31, 1975
The operation of the ANL 4-MeV accelerator for the reporting period September 1, 1974 through August 31, 1975 is described. Some improvements and modifications to the accelerator and associated equipment are reported, and activities on the three research projects are summarized. An outline of work for the next reporting period indicates a shift from the BYU 2-MeV accelerator to the 4-MeV accelerator to take advantage of the higher beam energy. (auth)
Date:
January 1, 1975
Creator:
Dixon, D. R. & Hill, M. W.
Object Type:
Report
System:
The UNT Digital Library
ACTVE News, Volume 6, Number 1, January 1975
Newsletter issued by the Advisory Council for Technical-Vocational Education in Texas discussing news, events, and other relevant information related to technical and vocational education for adults in Texas.
Date:
January 1975
Creator:
Advisory Council for Technical-Vocational Education in Texas
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Adagio
Access:
Use of this item is restricted to the UNT Community
Recording of Raoul de Smet's Adagio. For this work the composer had proposed harmony and relaxation "before anything else.” From there, a slow and steady tempo and very simple form. The sound material is provided by twelve ordinary sound generators. The work begins with a chord in the treble, slowly emerging from the silence or void sound and sustained by a regular pulsation in the bass, the result of differential sounds. Then several new sounds are added while others change timbre, octave, or dynamics causing different sounds of other types. During a slow rise in crescendo, short glissandi roam and decorate the sound space until the climax is reached. A sound column, containing twelve frequencies, comes to rest for about a minute, allowing the ear to move in the audience and thus capture the sound shimmer. This passage is the opposite of the sound of nothingness and could thus appear as a sound universe where one could also lose the notion of time. A brutal blow breaks this sound column like a spring too long stretched. This universe collapses slowly to retreat into the depths of the sound nothingness from which it came. The work was realized on an analogue …
Date:
1975
Creator:
De Smet, Raoul
Object Type:
Sound
System:
The UNT Digital Library
Advanced control and informations systems. Task 1: neutral injection beams. Informal progress report No. 1, 1 March--30 June 1975
Techniques were developed for estimating varying device coefficients in the control system of LBL neutral beam sources. The calibration of the current control is described, and results of a computer simulation are given. (PMA)
Date:
January 1, 1975
Creator:
Nevins, J. L. & Metzinger, R. W.
Object Type:
Report
System:
The UNT Digital Library
Advanced coupling of nuclear reactor-gas laser systems. Technical progress report, August 31, 1974--August 31, 1975
None
Date:
January 1, 1975
Creator:
Verdeyen, J. T.; Miley, G. H. & Wells, W. E.
Object Type:
Report
System:
The UNT Digital Library
Advanced geothermal primary heat exchanger (APEX). Quarterly progress report Q-1, 1 July 1975-30 September 1975
The major effort during this reporting period was directed toward performing the analytical design task and initiating the laboratory setup for the self-cleaning heat exchanger concept. Analytical design includes the selection of a suitable demonstration site, water chemistry and temperature, and thermodynamic power cycle, and parametric design and sensitivity analysis of a heat exchanger suitable for a 10 MW electric proof of concept plant. (MHR)
Date:
January 1, 1975
Creator:
Addoms, J.F. & Schoenman, L.
Object Type:
Report
System:
The UNT Digital Library
Advanced geothermal primary heat exchanger (APEX). Quarterly progress report Q-2, 1 October 1975-31 December 1975
The APEX program is designed to investigate the concept that a continuously recirculating flow of fine solid particles in the brine stream will substantially retard the formation of scale in the primary heat exchanger. The primary technical effort during this reporting period has been the buildup of the test facility. Some preliminary testing has been conducted in order to establish process equipment suitability prior to completing the test facility design. Fouling experiments have also been conducted in the chemistry laboratory to preliminarily screen candidate geothermal fluid simulants. (MHR)
Date:
January 1, 1975
Creator:
Addoms, J.F.
Object Type:
Report
System:
The UNT Digital Library
Advanced nuclear reactors
None
Date:
January 1, 1975
Creator:
Trauger, D.B.
Object Type:
Article
System:
The UNT Digital Library
Advanced refrigeration system for the Brookhaven superconducting cable project
A description is given of a basic supercritical refrigerator. The present status of the cable enclosure and the types of cooling schemes being considered are presented with some examples of laboratory results and computer analysis. (MOW)
Date:
January 1, 1975
Creator:
Jensen, J. E.
Object Type:
Article
System:
The UNT Digital Library
Advanced thermionic energy conversion. Progress report, September 1, 1974--August 31, 1975
During this reporting period the characteristics of several types of advanced thermionic energy converters were explored, both analytically and experimentally. Two new converter test vehicles were developed and two test stands and a controlled-atmosphere converter processing station were completed for use in the experimental program. Our previous understanding of pulsed converters was confirmed experimentally, and the work of earlier investigators concerning the inert gas ignited triode was substantiated. However, the experimental performances of the cesium vapor ignited and unignited triode converters were found to be significantly less than expected. More detailed analysis of their basic operation has revealed previously unsuspected constraints on the plasma in these advanced modes of operation. Based on both analysis and experimental results, the ignited triode was selected as the most attractive mode of converter operation for more intensive future study. A ''mini-system'', combining a thermionic diode operating in air and a flux-reset circuit, was constructed to demonstrate that inductive output coupling could be used effectively. A variety of thermionic heat exchanger concepts was evaluated, and cylindrical geometry was selected as the reference design concept. System analysis showed this design should be economically attractive for topping central station electricpower plants if 2nd generation performance can be …
Date:
January 1, 1975
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Advanced thermionic technology, FY 1975. Progress report No. 7
None
Date:
January 1, 1975
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Advanced thermionic technology, FY1975. Progress report number 4, October 1974
None
Date:
January 1, 1975
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Advances in electrostatic accelerators
None
Date:
January 1, 1975
Creator:
Wegner, H. E.
Object Type:
Article
System:
The UNT Digital Library
Advantages of neutron scattering for biological structure analysis
The advantages and disadvantages of neutron scattering for protein crystallography, scattering from oriented systems, and solution scattering are summarized. Techniques for minimizing the disadvantages are indicated. (JSR)
Date:
January 1, 1975
Creator:
Schoenborn, Benno P.
Object Type:
Article
System:
The UNT Digital Library
Advertisement for the First All-Pittsburgh Talent Jazz Concert at the Fourth Annual Black Solidarity Fair, May 6, 1975
Advertisement for the First All-Pittsburgh Talent Jazz Concert at the Fourth Annual Black Solidarity Fair, May 6, 1975, including Roy Eldridge. The reverse side details sponsorship by the Heinz company.
Date:
1975
Creator:
{{{name}}}
Object Type:
Clipping
System:
The Portal to Texas History
[Aerial Photograph of Hardin-Simmons University]
Aerial photograph of the Hardin-Simmons University campus looking northwest with Behrens Chapel, Rose Field House, and Richardson Library (under construction) in the center of the frame.
Date:
1975
Creator:
unknown
Object Type:
Photograph
System:
The Portal to Texas History
[Aerial Photograph of Hardin-Simmons University]
Aerial photograph of the Hardin-Simmons University campus looking northwest with the Sandefer Memorial, Behrens Auditorium, and Moody Center in the center of the frame.
Date:
[1975..1976]
Creator:
unknown
Object Type:
Photograph
System:
The Portal to Texas History