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399 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
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
[Notes from phone call with Ed Oakley]
Typed notes from phone call with Ed Oakley concerning ordinance changes in Oak Lawn.
Date:
November 14, 1991
Creator:
unknown
Object Type:
Text
System:
The UNT Digital Library
[Notes: Interview with Kay Vinson]
Notes from an interview with Kay Vinson.
Date:
August 14, 1991
Creator:
unknown
Object Type:
Text
System:
The UNT Digital Library
[Notes: Interview with Marc Leitman]
Notes from an interview with Mark Leitman regarding questionable financial expenditures and practices during the March on Austin 1991.
Date:
August 14, 1991
Creator:
unknown
Object Type:
Text
System:
The UNT Digital Library
[Press release: HRCP hires new midwest regional field organizer]
Press release from the Human Rights Campaign Fund announcing staff changes and expansion in the southeast.
Date:
August 14, 1991
Creator:
Human Rights Campaign Fund
Object Type:
Text
System:
The UNT Digital Library
[Press release: P-FLAG to collect discrimination stories]
Press release announcing the campaign of P-FLAG to collect stories of gay and lesbian discrimination for Coming Out Day later that year.
Date:
June 14, 1991
Creator:
Federation of Parents and Friends of Lesbians and Gays Inc.
Object Type:
Text
System:
The UNT Digital Library
The Tulia Herald (Tulia, Tex.), Vol. 83, No. 11, Ed. 1 Thursday, March 14, 1991
Weekly newspaper from Tulia, Texas that includes local, state and national news along with extensive advertising.
Date:
March 14, 1991
Creator:
Reynolds, Jim
Object Type:
Newspaper
System:
The Portal to Texas History
The Tulia Herald (Tulia, Tex.), Vol. 83, No. 7, Ed. 1 Thursday, February 14, 1991
Weekly newspaper from Tulia, Texas that includes local, state and national news along with extensive advertising.
Date:
February 14, 1991
Creator:
Reynolds, Jim
Object Type:
Newspaper
System:
The Portal to Texas History
The Tulia Herald (Tulia, Tex.), Vol. 83, No. 46, Ed. 1 Thursday, November 14, 1991
Weekly newspaper from Tulia, Texas that includes local, state and national news along with extensive advertising.
Date:
November 14, 1991
Creator:
Reynolds, Jim
Object Type:
Newspaper
System:
The Portal to Texas History
[News Clip: Cop shoot]
B-roll video footage from the WBAP-TV television station in Fort Worth, Texas, covering a news story. This story aired at 5:30pm.
Date:
April 14, 1991, 5:30 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
Technology transfer from the space exploration initiative
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, spacecraft, robotics, rovers, mining and manufacturing, communications, navigation, habitats, life support and infrastructures are reviewed to identify possible technology areas. For example, better means for working in hazardous areas and handling hazardous waste are potential outcomes of this initiative. Methods to produce higher quality goods and improve America's competitiveness in manufacturing will undoubtedly evolve from the need to produce products that must last many years in the harsh environments of space and planetary surfaces. Some ideas for technology transfer are covered in this paper.
Date:
June 14, 1991
Creator:
Buden, D.
Object Type:
Article
System:
The UNT Digital Library
Enhancing the use of coals by gas reburning-sorbent injection
The objective of this project is to evaluate and demonstrate a cost effective emission control technology for acid rain precursors, oxides of nitrogen (NO{sub x}) and sulfur (SO{sub x}), on two coal fired utility boilers in Illinois. The units selected are representative of pre-NSPS design practices: tangential and cyclone fired. Work on a third unit, wall fired, has been stopped because of funding limitations. The specific objectives are to demonstrate reductions of 60 percent in NO{sub x} and 50 percent in SO{sub x} emissions, by a combination of two developed technologies, gas reburning (GR) and sorbent injection (SI).
Date:
October 14, 1991
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
[News Clip: Dominoes]
Video footage from the WBAP-TV television station in Fort Worth, Texas, covering a news story. This story aired at 10pm.
Date:
March 14, 1991, 10:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
Methods for testing transport models
Substantial progress has been made over the past year on six aspects of the work supported by this grant. As a result, we have in hand for the first time a fairly complete set of transport models and improved statistical methods for testing them against large databases. We also have initial results of such tests. These results indicate that careful application of presently available transport theories can reasonably well produce a remarkably wide variety of tokamak data.
Date:
November 14, 1991
Creator:
Singer, C. & Cox, D.
Object Type:
Report
System:
The UNT Digital Library
Development of a catalyst for conversion of syngas-derived materials to isobutylene
The objective of this program is to develop an improved catalyst and process for the conversion of synthesis gas to isobutylene. The research will identify and optimize the key catalyst and process characteristics that give improved performance for CO conversion by a non-Fischer-Tropsch process.
Date:
August 14, 1991
Creator:
Gajda, G. J. & Barger, P. T.
Object Type:
Report
System:
The UNT Digital Library
Fluidized-bed copper oxide process
The fluidized-bed copper oxide process was developed to simultaneously remove sulfur dioxide and nitrogen oxide contaminants from the flue gas of coal-fired utility boilers. This dry and regenerable process uses a copper oxide sorbent in a fluidized-bed reactor. Contaminants are removed without generating waste material. (VC)
Date:
October 14, 1991
Creator:
Shah, P.P.; Takahashi, G.S. & Leshock, D.G.
Object Type:
Report
System:
The UNT Digital Library