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606 Matching Results
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NQR-NMR studies of higher alcohol synthesis Cu-Co catalysts
Copper and cobalt are the key elements in syngas conversion catalyst systems used for higher alcohol synthesis. Their proximity and synergy sensitively control the selectivity and efficiency of the process. It is believed that their outer electronic charge distribution which is responsible for their electrical and magnetic properties might be governing their catalytic properties also. To examine the correlation between catalytic and magnetic properties, a series of copper cobalt catalysts (Co/Cu ratio 5:1 to 5:5) with and without a support were prepared. The nuclear quadrupole resonance spectrum of copper and (zero-field) nuclear magnetic resonance spectrum of cobalt and magnetization and hysteresis character of the catalyst were analyzed. Similar to the catalytic results, the magnetic results also were found to be very sensitive to the preparation technique. The results indicate possible electron exchange between copper and cobalt, and cobalt and the support Titania.
Date:
January 14, 1991
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
[Letter from Jan Schronk to Bill McCarter and Jack Davis, October 14, 1991]
Photocopy of a letter from Jan Schronk, Director of Fine Arts for Hurst-Euless-Bedford ISD, to Bill McCarter and Jack Davis, co-directors of North Texas Institute for Educators on the Visual Arts. In regards to HEB's commitments to North Texas Institute for Educators on the Visual Arts and that Schronk will contribute 15% of her time during the 1992 calendar to activities related to staff development and implementation efforts of discipline-based art education. In addition, five art specialists will devote a substantial amount of time toward the DBAE program. Enclosed with the letter are stipend worksheets for the faculty's current income. Worksheet not present with letter.
Date:
October 14, 1991
Creator:
Schronk, Jan
Object Type:
Letter
System:
The UNT Digital Library
[Letter from Tim Sonnenberg to Bill McCarter and Jack Davis, October 14, 1991]
Photocopy of a letter from Tim Sonnenberg, Superintendent of Denton ISD, to Bill McCarter and Jack Davis, co-directors of North Texas Institute for Educators on the Visual Arts. Informing McCarter and Davis the commitments that Denton ISD has made to NTIEVA. As such Sandra Parker will contribute 5% of her time during the 1992 school calendar to activities related to the staff development and implementation efforts of discipline-based art (DBAE). In addition, three art teachers will devote substation amount of time as well to NTIEVA. Enclosed in the letter is a stipend worksheet of the faculty salaries. Stipend worksheet not present with letter.
Date:
October 14, 1991
Creator:
Sonnenberg, Tim
Object Type:
Letter
System:
The UNT Digital Library
A sendmail. cf scheme for a large network
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 we based it on, and the parts of the sendmail.cf files which support the topology.
Date:
August 14, 1991
Creator:
Darmohray, T.M.
Object Type:
Article
System:
The UNT Digital Library
Additional information for impact response of the restart safety rods
WSRC-RP-91-677 studied the structural response of the safety rods under the conditions of brake failure and accidental release. It was concluded that the maximum impact loading to the safety rod is 6020 pounds based on conservative considerations that energy dissipation attributable to fluid resistance and reactor superstructure flexibility. The staffers of the Defense Nuclear Facility Safety Board reviewed the results and inquired about the extent of conservatism. By request of the RESTART team, I reassessed the impact force due to these conservative assumptions. This memorandum reports these assessments.
Date:
October 14, 1991
Creator:
Yau, W. W. F.
Object Type:
Report
System:
The UNT Digital Library
Inherently safe nuclear-driven internal combustion engines
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 provide inherent nuclear safety. It is expected that nuclear engine reactor units could be scaled from 100 MW on up. 7 refs., 3 figs.
Date:
June 14, 1991
Creator:
Alesso, P.; Chow, Tze-Show; Condit, R.; Heidrich, J.; Pettibone, J. & Streit, R.
Object Type:
Article
System:
The UNT Digital Library
Nuclear thermal rocket clustering: 1, A summary of previous work and relevant issues
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., 3 figs., 2 tabs.
Date:
July 14, 1991
Creator:
Buksa, J.J. & Houts, M.G.
Object Type:
Article
System:
The UNT Digital Library
Rapid regulatory control of plant cell expansion and wall relaxation
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 the past 12 months. In large part, we have been trying to analyze the nature of growth rate noise,'' i.e. spontaneous and often erratic variations in growth rate. We are obtaining evidence that such noise'' is not random, but rather reveals an underlying growth mechanism with complex dynamics.
Date:
August 14, 1991
Creator:
Cosgrove, D.J.
Object Type:
Report
System:
The UNT Digital Library
[Photograph 2012.201.B0071.0041]
Photograph used for a newspaper owned by the Oklahoma Publishing Company.
Date:
May 14, 1991
Creator:
Sisney, Steve
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0137.0579]
Photograph used for a newspaper owned by the Oklahoma Publishing Company.
Date:
January 14, 1991
Creator:
Klock, Roger
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0144.0550]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Oklahoma City Firefighter Al Cothran applies an American Flag to a fire helmet."
Date:
February 14, 1991
Creator:
Hellstern, Paul
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0150.0464]
Photograph used for a story in the Oklahoma Times newspaper. Caption: "Harold Eckel, bob Ashby and Ray Key the newly formed Crestwood Neighborhood Association look over one of the association's new signs"
Date:
January 14, 1991
Creator:
Southerland, Paul B.
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0134.0415]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Out for blood " .. O U' s Drew Christmon after Joey Missildine ..."
Date:
September 14, 1991
Creator:
Hellstern, Paul
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0335.0400]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "OSU senior Robert Kirksey (14) thinks things will get better for the winless Cowboys."
Date:
September 14, 1991
Creator:
Hoke, Doug
Object Type:
Photograph
System:
The Gateway to Oklahoma History
The effect of passive material on the detection of hadrons in calorimeter configurations for the SDC detector
We have used a flexible geometry model of a calorimeter design for SDC to study the effect of passive material in front of the calorimeter and between the barrel and endcap modules on the apparent response to hadrons. The thicknesses of the passive materials have been chosen to closely resemble the currently projected wall thicknesses of the scintillating tile-fiber and liquid-argon calorimeter designs. The liquid-argon model contains about three times the amount of material in its shells compared to the tile-fiber model. The solenoid coil reduces the relative difference somewhat in the barrel region but constitutes only a minor correction in the transition region from barrel to endcap. Correspondingly, we find a significantly worse response for the liquid-argon case which we demonstrate using beams of single {pi}{sup minus} particles of 10 GeV/c momentum. 13 refs., 6 figs.
Date:
August 14, 1991
Creator:
Kirk, T. B. W. & Trost, H. J.
Object Type:
Report
System:
The UNT Digital Library
[Photograph 2012.201.B0224.0532]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Combating gang violence and returning neighborhoods to residents will be the first priority for Oklahoma City Police, Sam Gonzales announced Monday during his first day on the job as the city's new police chief."
Date:
October 14, 1991
Creator:
Beckel, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0252.0749]
Photograph used for a story in the Oklahoma Times newspaper. Caption: "Hatcher Betty - jobs for seniors"
Date:
August 14, 1991
Creator:
Miller, Joe
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0261.0306]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Lucia Perri of Guthrie holds a sign as students rally at the University of Oklahoma on Monday to show support for returning law professor Anita Hill, Hill has accused Supreme Court nominee Clarence Thomas of sexually harassing her while she worked for him in Washington, D. C., from 1987 to 1983, ."
Date:
October 14, 1991
Creator:
Sisney, Steve
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0224.0541]
Photograph used for a story in the Daily Oklahoman newspaper.
Date:
October 14, 1991
Creator:
Beckel, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0247.0412]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Mitzi Hancuff, left, assists Stephanie Brou, 6, with an art project at Edmond's Fine Art Institute."
Date:
November 14, 1991
Creator:
Southerland, Paul
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0224.0539]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Oklahoma City Police Chief Sam Gonzales said the King incident has forced police departments across the country to reevaluate their policies."
Date:
October 14, 1991
Creator:
Beckel, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0224.0526]
Photograph used for a newspaper owned by the Oklahoma Publishing Company.
Date:
October 14, 1991
Creator:
Beckel, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0309B.0374]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "At right, Ed and Barbara Townsend and Barbara Thornton and Niles Jackson, from left, visit."
Date:
November 14, 1991
Creator:
Gooch, Steve
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0248.0021]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Shattuck QB Dusty Hansen runs away from a Ringling defender during Saturday's Class A championship game in Moore."
Date:
December 14, 1991
Creator:
Gooch, Steve
Object Type:
Photograph
System:
The Gateway to Oklahoma History