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The excess flux in the cosmic submillimeter background radiation and the primordial deuterium abundance
Recent measurements of the cosmic background radiation (CBR) show an enhanced flux in the submillimeter regime, compared to the spectrum of a 2.7 K blackbody. Thermal Comptonization of the relic radiation by a hot nonrelativistic plasma has long been known to produce distortions in the CBR spectrum, similar to what has now been observed. Heating of the primeval plasma to temperatures T {approximately} 10{sup 6} {minus} 10{sup 8} K could result from the injection of subcosmic ray protons at epoch z {approximately} 10--100. The intensity of the subcosmic ray flux that provide conditions needed to explain the submillimeter excess by thermal Comptonization also leads to the production of cosmologically significant amounts of deuterium in collisions between subcosmic ray protons and primordial protons and {alpha}-particles. However, the amount of lithium produced through {alpha}-{alpha} reactions is in conflict with the observed Li abundance. If lithium is depleted, for example, by processing through Population II stars, arguments for the baryon content of the universe based on primordial deuterium and He abundances are weakened. 12 refs., 1 fig., 1 tab.
Date:
October 27, 1989
Creator:
Dermer, C. D.; Guessoum, N. (Lawrence Livermore National Lab., CA (USA) & National Aeronautics and Space Administration, Greenbelt, MD (USA). Lab. for High Energy Astrophysics)
Object Type:
Article
System:
The UNT Digital Library
Enhanced durability and reactivity for zinc ferrite desulfurization sorbent
AMAX Research Development Center (AMAX R D) has been investigating methods for improving the reactivity and durability of the zinc ferrite desulfurization sorbent. Zinc ferrite sorbents are intended for use in desulfurization of hog coal gas in integrated gasification combined cycle (IGCC) or molten carbonate fuel cell (MCFC) applications. The reactivity of the sorbent may be defined as its sulfur sorption capacity at the breakthrough point in a bench-scale fixed-bed reactor. The durability may be defined as the ability of the sorbent to maintain its reactivity and other important physical characteristics such as size, strength, and specific surface area during 10 cycles of sulfidation and regeneration. Two base case sorbents, spherical pellets and cylindrical extrudes used in related METC sponsored projects, are being used to provide a basis for the comparison of physical characteristics and chemical reactivity.
Date:
October 27, 1987
Creator:
Jha, M. C. & Berggren, M. H.
Object Type:
Report
System:
The UNT Digital Library
Upper limits on neutron bursts emitted from Ti pressurized D sub 2 gas cells
In a search for bursts of neutrons from Ti in pressurized D{sub 2} gas cells, no statistically significant deviations from the background were observed for events where five or more neutrons are detected over a ten day experiment, including 103 hours of counting with cells on, and 28 hours counting of various backgrounds. Up to four cells were used including some 60 grams of 662-Ti fillings in a pressurized cylinder with 40-60 atmosphere of D{sub 2} gas. Other Ti samples were used too. The samples were cooled to liquid nitrogen temperature and placed in front of the neutron detector while warming up to room temperature. Seven cooling cycles were used, for each sample. The neutron detector system included 12 liquid scintillator neutron detectors, arranged in a close packed geometry, with six detectors in the upper hemisphere and six in the lower hemisphere. A central detector placed 2 cm from the cells was used, in each hemisphere, as a scatterer for a time of flight coincidence measurement, yielding the total coincidence efficiency of {epsilon}=2{plus minus}1%. The system was also used in singles mode to allow for counting with large efficiency. A neutron event is characterized by measuring its pulse heights, pulse …
Date:
October 27, 1989
Creator:
Rugari, S. L.; France, R. H., III; Gai, M.; Lund, B. J.; Smolen, S. D.; Zhao, Z. et al.
Object Type:
Report
System:
The UNT Digital Library
[Photograph 2012.201.B0139.0151]
Photograph used for a story in the Oklahoma Times newspaper. Caption: "Corey Cole, 11, a sixth-grader at Moore's Kingsgate Elementary School, poses with his prize-winning giraffe."
Date:
October 27, 1982
Creator:
Hoke, Doug
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0136.0042]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Rose Clark, owner of Talent Tree Personnel Services."
Date:
October 27, 1984
Creator:
McDaniel, David
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0141.0353]
Photograph used for a newspaper owned by the Oklahoma Publishing Company.
Date:
October 27, 1989
Creator:
unknown
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0307B.0458]
Photograph used for a newspaper owned by the Oklahoma Publishing Company.
Date:
October 27, 1986
Creator:
Beckel, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Use of the Egret instrument in studies of the origin of the cosmic radiation
This is a continuation of previous studies aimed at predicting spectral signatures of discrete cosmic-ray sources. In this paper, a formalism is developed for calculating gamma-ray spectra observed at Earth from the decay of neutral pions formed in collisions of cosmic-ray protons and ions with galactic gas and dust. The cosmic rays are assumed to be emitted by discrete sources, and their intensities and spectra are described by solutions to a diffusion equation. Calculations of spectral signatures expected from these hypothetical point sources of cosmic rays are presented. In particular, a steady source of cosmic rays could show a harder gamma-ray spectrum than the spectrum of the diffuse galactic background, whereas an impulsive source of cosmic rays could show a much softer spectrum. Observations of the angular variations of gamma-ray intensities and spectra near point sources will provide information on cosmic-ray propagation in other parts of our galaxy, as well as on the nature of the discrete sources themselves. Capabilities of the Egret telescope in mapping spectra from cosmic-ray point sources are briefly discussed. 14 refs., 2 figs.
Date:
October 27, 1989
Creator:
Dermer, C. D.
Object Type:
Article
System:
The UNT Digital Library
Low-pressure ion source
A low pressure ion source for a neutron source comprises a filament cathode and an anode ring. Approximately 150V is applied between the cathode and the anode. Other electrodes, including a heat shield, a reflector and an aperture plate with a focus electrode, are placed at intermediate potentials. Electrons from the filament drawn out by the plasma and eventually removed by the anode are contained in a magnetic field created by a magnet ring. Ions are formed by electron impact with deuterium or tritium and are extracted at the aperture in the focus electrode. The ion source will typically generate a 200 mA beam through a 1.25 cm/sup 2/ aperture for an arc current of 10A. For deuterium gas, the ion beam is over 50 percent D/sup +/ with less than 1% impurity. The current density profile across the aperture will typically be uniform to within 20%.
Date:
October 27, 1982
Creator:
Bacon, F.M.; Brainard, J.P.; O'Hagan, J.B. & Walko, R.J.
Object Type:
Text
System:
The UNT Digital Library
[Photograph 2012.201.B0224.0729]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Eddie Goodlow draws a crowd, no matter where he runs."
Date:
October 27, 1984
Creator:
McDaniel, David
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0270.0245]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Last November, Lois Hunsaker of Oklahoma City was named the third Oklahoma Female Veteran of the Year."
Date:
October 27, 1988
Creator:
Southerland, Paul
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0266.0439]
Photograph used for a story in the Oklahoma Times newspaper. Caption: "Late decision leaves contractor Keith Hoster out on a limb."
Date:
October 27, 1981
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0307B.0440]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "James Jones talks with reporters in Oklahoma City Monday."
Date:
October 27, 1986
Creator:
Beckel, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0262.0201]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Dr. Alan R. Hinman"
Date:
October 27, 1986
Creator:
Southerland, Paul
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0248.0374]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Guy Hardaker"
Date:
October 27, 1980
Creator:
unknown
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0158.0232]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "High water laps around the legs of a park bench and covers the grounds of Ray Trent Park in Del City Saturday after heavy early-morning rains swelled nearby Crutcho Creek."
Date:
October 27, 1984
Creator:
Wilson, George R.
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0156.0140]
Photograph used for a newspaper owned by the Oklahoma Publishing Company.
Date:
October 27, 1986
Creator:
unknown
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0266.0438]
Photograph used for a story in the Oklahoma Times newspaper. Caption: "Keith Hoster's tree hoist has been foiled."
Date:
October 27, 1981
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0229.0077]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Mrs. Robert Greeney, Canberra, Australia, paints with members of local china painting organizations during a luncheon in her honor while she was on a visit to Oklahoma City."
Date:
October 27, 1981
Creator:
Lynn, Renee
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0247.0426]
Photograph used for a story in the Oklahoma Times newspaper. Caption: "Nick Sciartelli and Kathy Hand do the Cotton-Eyed Joe during a country-western dance class."
Date:
October 27, 1980
Creator:
Beuhner, Jeff
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0267.0823]
Photograph used for a newspaper owned by the Oklahoma Publishing Company.
Date:
October 27, 1984
Creator:
McDaniel, David
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0257.0423]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Sake Herrick"
Date:
October 27, 1986
Creator:
Klock, Roger
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0257.0467]
Photograph used for a story in the Oklahoma Times newspaper. Caption: "Wearing togas and holding a scroll at Putnam City Apollo Elementary School are, from left, Dwayne Herron,(7); Kristine Garrett, 9; Brad Allen, 8, Noel Manes, 5; and Angie Turner, 8."
Date:
October 27, 1982
Creator:
Lynn, Renee
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0224.0458]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Gary Gomez produces some mellow tunes on the cello."
Date:
October 27, 1981
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History