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72,085 Matching Results

Start Over Access Open Access Day 6th Language English

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Ductile nickel-silicon alloy (open access)

Ductile nickel-silicon alloy

An improvement over prior compositions wherein the ductility of Ni-Si alloys are improved with minor alloying additions of hafnium or zirconium.
Date: August 6, 1990
Creator: Oliver, W. C.
Object Type: Patent
System: The UNT Digital Library
[News Clip: O. J. Simpson] captions transcript

[News Clip: O. J. Simpson]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date: July 6, 1994, 10:00 p.m.
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Object Type: Video
System: The UNT Digital Library
[News Clip: World Cup] captions transcript

[News Clip: World Cup]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date: June 6, 1994, 5:00 p.m.
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Object Type: Video
System: The UNT Digital Library
[News Clip: World Cup] captions transcript

[News Clip: World Cup]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date: June 6, 1994, 6:00 p.m.
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Object Type: Video
System: The UNT Digital Library
[News Clip: Kid murder] captions transcript

[News Clip: Kid murder]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date: March 6, 1994, 5:30 p.m.
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Object Type: Video
System: The UNT Digital Library
[News Clip: Quayle released] captions transcript

[News Clip: Quayle released]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date: December 6, 1994, 10:00 p.m.
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Object Type: Video
System: The UNT Digital Library
[News Clip: Violence] captions transcript

[News Clip: Violence]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date: March 6, 1994, 10:00 p.m.
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Object Type: Video
System: The UNT Digital Library
Mechanical structure of the Mirror Hybrid Reactor Power Plant (open access)

Mechanical structure of the Mirror Hybrid Reactor Power Plant

The mechanical structure of the LLL/GA Mirror Hybrid Reactor vessel is briefly discussed. Functional requirements and over-all design considerations leading to selection of a post-tensioned concrete reactor vessel and a modular blanket approach are indicated. Module design life of four years, module replacement, capability and remote fueling are provided by the chosen structural design. (RME)
Date: June 6, 1977
Creator: Culver, D.W. & Neef, W.S.
Object Type: Article
System: The UNT Digital Library
Workshop on core and sample curation for the National Continental Scientific Drilling Program (open access)

Workshop on core and sample curation for the National Continental Scientific Drilling Program

The Workshop on Core and Sample Curation was held to discuss the best means of handling, distributing, and advertising samples and data collected during a Continental Scientific Drilling Program (CSDP) and to establish better communication between sample curators regarding common problems. It was geneerally agreed that CSDP samples should be handled, on a regional basis, by existing data systems and sample repositories judged to have adequate staff and support. Repository design, sample handling procedures, and sample accounting systems were discussed. Across North America, support for curation of geological samples was varied, but it was strongest within states or regions with well-established energy and mineral industries. A well-supported repository pays for itself through the circulation and preservation of samples and stratigraphic information. A national CSDP must have a well-established curatorial policy and system of regional repositories to circulate information and samples throughout the scientific community. Well-curated samples and data are a national resource with considerable benefits for industry and academia. Attendees agreed to form a Society of Geoscience Curators to maintain communication between curators from private, government, and university repositories and core research laboratories.
Date: May 6, 1981
Creator: Goff, S. & Heiken, G. (eds.)
Object Type: Article
System: The UNT Digital Library
Nuclear reaction uncertainties in standard and non-standard cosmologies (open access)

Nuclear reaction uncertainties in standard and non-standard cosmologies

We discuss here the uncertainties in the nuclear input data relevant for calculations of standard and non-standard primordial nucleosynthesis. We show how these uncertainties can affect the predictive power of such calculations, and we identify those key nuclear reactions for which improved experimental data on the associated reaction rates is most needed. Such experimental data can lead to more accurate discriminatory tests between the differing primordial nucleosynthesis scenarios. 34 refs., 3 tabs.
Date: October 6, 1989
Creator: Malaney, R.A.
Object Type: Article
System: The UNT Digital Library
Summary of computational support and general documentation for computer code (GENTREE) used in Office of Nuclear Waste Isolation Pilot Salt Site Selection Project (open access)

Summary of computational support and general documentation for computer code (GENTREE) used in Office of Nuclear Waste Isolation Pilot Salt Site Selection Project

A Decision Tree Computer Model was adapted for the purposes of a Pilot Salt Site Selection Project conducted by the Office of Nuclear Waste Isolation (ONWI). A deterministic computer model was developed to structure the site selection problem with submodels reflecting the five major outcome categories (Cost, Safety, Delay, Environment, Community Impact) to be evaluated in the decision process. Time-saving modifications were made in the tree code as part of the effort. In addition, format changes allowed retention of information items which are valuable in directing future research and in isolation of key variabilities in the Site Selection Decision Model. The deterministic code was linked to the modified tree code and the entire program was transferred to the ONWI-VAX computer for future use by the ONWI project.
Date: December 6, 1983
Creator: Beatty, J.A.; Younker, J.L.; Rousseau, W.F. & Elayat, H.A.
Object Type: Report
System: The UNT Digital Library
Waste management strategy for nuclear fusion power systems from a regulatory perspective (open access)

Waste management strategy for nuclear fusion power systems from a regulatory perspective

A waste management strategy for future nuclear fusion power systems is developed using existing regulatory methodology. The first step is the development of a reference fuel cycle. Next, the waste streams from such a facility are identified. Then a waste management system is defined to safely handle and dispose of these wastes. The future regulator must identify the decisions necessary to establish waste management performance criteria. The data base and methodologies necessary to make these decisions must then be developed. Safe management of nuclear fusion wastes is not only a technological challenge, but encompasses significant social, political, and ethical questions as well.
Date: December 6, 1977
Creator: Heckman, R.A.
Object Type: Article
System: The UNT Digital Library
Establishment and maintenance of a coal sample bank and data base (open access)

Establishment and maintenance of a coal sample bank and data base

Headspace oxygen contents of several designated drums containing {minus}l inch and {minus}{1/4} inch coal were measured. These measurements were later discontinued by agreement with the Project Manager, as the leakage of plastic drums and buckets has been well documented. During the current reporting period a total of 65 data printouts were distributed. In addition, 10 special data requests were fulfilled by either search/sort and printout or creation of a data disk, resulting in distribution of limited information on 4,479 samples. Several preliminary requests for Sample Bank and Data Base information and price quotations have also been handled. Four hundred copies of the 61-page second edition of the booklet The Penn State Coal Sample Bank and Data Base'' were received from the printer. Changes in format have allowed increased content in fewer pages, to reduce printing and mailing costs. Three hundred thirty-nine copies were distributed. Data generated on samples DECS-1 through DECS-14 were added to the Penn State Coal Data Base. Map reference data were verified for all 14 samples.
Date: February 6, 1991
Creator: Davis, A.
Object Type: Report
System: The UNT Digital Library
Patterns of United States mortality for ten selected causes of death (open access)

Patterns of United States mortality for ten selected causes of death

Income, ethnicity, education, and occupation are examples of socio-economic factors associated with the occurrence of disease, whether an investigation focuses on an individual or on an aggregation of individuals. In this study, data aggregated to the county level are used to explore two issues - geographic variation and geographic covariation of ten selected causes of death in the United States. The counties of the United States are characterized by 15 socio-economic variables and age-adjusted mortality rates for the ten selected causes of death. The observed variation among the US counties, as measured by the socio-economic variables, is first assessed, then the geographic variation and covariation are described for each cause of death and, finally, the covariation among causes of death is analyzed after adjusting for the influences of the measured sources of county variation.
Date: November 6, 1980
Creator: Selvin, S.; Sacks, S.T. & Merrill, D.W.
Object Type: Report
System: The UNT Digital Library
Solar coal-gasification reactor with pyrolysis-gas recycle. [Patent application] (open access)

Solar coal-gasification reactor with pyrolysis-gas recycle. [Patent application]

Coal (or other carbonaceous matter, such as biomass) is converted into a product gas that is substantially free from hydrocarbons. The coal is fed into a solar reactor, and solar energy is directed into the reactor onto coal char, creating a gasification front and a pyrolysis front. A gasification zone is produced well above the coal level within the reactor. A pyrolysis zone is produced immediately above the coal level. Steam, injected into the reactor adjacent to the gasification zone, reacts with char to generate product gases. Solar energy supplies the energy for the endothermic steam-char reaction. The hot product gases flow from the gasification zone to the pyrolysis zone to generate hot char. Gases are withdrawn from the pyrolysis zone and reinjected into the region of the reactor adjacent the gasification zone. This eliminates hydrocarbons in the gas by steam reformation on the hot char. The product gas is withdrawn from a region of the reactor between the gasification zone and the pyrolysis zone. The product gas will be free of tar and other hydrocarbons, and thus be suitable for use in many processes.
Date: April 6, 1981
Creator: Aiman, W.R. & Gregg, D.W.
Object Type: Patent
System: The UNT Digital Library
Harmonically excited orbital variations (open access)

Harmonically excited orbital variations

Rephrasing the equations of motion for orbital maneuvers in terms of Lagrangian generalized coordinates instead of Newtonian rectangular cartesian coordinates can make certain harmonic terms in the orbital angular momentum vector more readily apparent. In this formulation the equations of motion adopt the form of a damped harmonic oscillator when torques are applied to the orbit in a variationally prescribed manner. The frequencies of the oscillator equation are in some ways unexpected but can nonetheless be exploited through resonant forcing functions to achieve large secular variations in the orbital elements. Two cases are discussed using a circular orbit as the control case: (1) large changes in orbital inclination achieved by harmonic excitation rather than one impulsive velocity change, and (2) periodic and secular changes to the longitude of the ascending node using both stable and unstable excitation strategies. The implications of these equations are also discussed for both artificial satellites and natural satellites. For the former, two utilitarian orbits are suggested, each exploiting a form of harmonic excitation. 5 refs.
Date: August 6, 1985
Creator: Morgan, T.
Object Type: Article
System: The UNT Digital Library
Mechanical design criteria for continuously operating neutral beams (open access)

Mechanical design criteria for continuously operating neutral beams

Mechanical design criteria for high-energy neutral beam injectors capable of prolonged operation are examined. The generalized structural, heat transfer, and hydraulics equations are presented for convectively cooled grids. The effectiveness of helium, liquid sodium, and subcooled water for cooling a 2-mm-diameter, 8-m-long grid tube is shown. Cooling effectiveness is determined as a function of the number of tubes in series vs heat flux, where the number of tubes in series ranges from 1 to 100 and the heat flux ranges from 100 to 10,000 W/cm/sup 2/. The stress analysis of the grid tube walls is presented, enabling data to be added to the heat transfer graphs and giving an upper flux limit for some grid materials. Sputtering is found to be a possible limiting factor for the grid lifetimes. In injectors designed for continuous use, long-term operation without excessive maintenance is required and sputtering must be minimized. To accomplish this, several procedures are proposed.
Date: October 6, 1977
Creator: Vosen, S. R.; Bender, D. J.; Fink, J. H. & Lee, J. D.
Object Type: Article
System: The UNT Digital Library
Proceedings of the Conference on technology-based confidence building: Energy and environment (open access)

Proceedings of the Conference on technology-based confidence building: Energy and environment

This document contains excerpts from the proceedings of the conference on Technology-based Confidence Building: Energy and the Environment.'' It contains the agenda for the conference and a document on Global Warming and Energy Use;'' a presentation on from Militarism to Environmentalism: a New Focus of US-Soviet Relations;'' a workshop on environmental challenges; a summary address on Science, Technology, and World Affairs;'' an address entitled Energy: the Coin of International Understanding;'' and concluding remarks.
Date: November 6, 1989
Creator: unknown
Object Type: Article
System: The UNT Digital Library
Meteorological conditions during the winter validation study at Rocky Flats, Colorado: An overview (open access)

Meteorological conditions during the winter validation study at Rocky Flats, Colorado: An overview

The objective for the Winter Validation Study was to gather field data for validation of the Terrain-Responsive Atmospheric Code (TRAC) under winter time meteorological conditions. Twelve tracer tests were conducted during a two-week period in February 1991. Each test lasted 12 hours, with releases of SF{sub 6} tracer from the Rocky Flats Plant near Golden, Colorado. The tests included ground-based and airborne sampling to 16 km from the release point. This presentation summarizes meteorological conditions during the testing period. Forty six viewgraphs are included.
Date: November 6, 1991
Creator: Hodgin, C.R.
Object Type: Report
System: The UNT Digital Library
Large-area sheet task advanced dendritic web growth development. Quarterly report, October 23, 1983-December 31, 1983 (open access)

Large-area sheet task advanced dendritic web growth development. Quarterly report, October 23, 1983-December 31, 1983

Two types of design concepts were evaluated with the thermal models: (1) a vertical thermal element which modifies both the temperature profile in the web as well as the convective gas flow near the web; and (2) a thinner lid configuration in which the second lid is replaced by a hot cavity. Each involves trade-offs which need experimental evaluation. Residual stress measurements using the serial split-width technique indicated that the real residual stress was comparable to (or less than) the equivalent residual stress, which has been used as a measure of structural perfection in web crystals in previous reports. New dynamic and new static configurations were given preliminary evaluation in the laboratory, with results generally in agreement with the made predictions. Improved system temperature measurements were made leading to growth in closer agreement with the model predictions. Improved methods for controlling convective gas flow and oxide deposition were developed.
Date: March 6, 1984
Creator: Duncan, C. S.; Seidensticker, R. G. & McHugh, J. P.
Object Type: Report
System: The UNT Digital Library
The effect of chemical additives on the synthesis of ethanol (open access)

The effect of chemical additives on the synthesis of ethanol

The objective of this research was to investigate the reaction mechanism of higher alcohol and aldehyde synthesis from syngas and the role of additives in the synthesis. An in situ IR reaction system and probe molecule technique were developed to study adsorbed species, active sites, and reaction pathway during reaction. The catalysts used for this study included silica-supported Rh, Ru, and Ni. (VC)
Date: March 6, 1992
Creator: Chuang, S.S.C.
Object Type: Report
System: The UNT Digital Library
The development of precipitated iron catalysts with improved stability (open access)

The development of precipitated iron catalysts with improved stability

The objective of this program is to identify the chemical principles governing the deactivation of precipitated iron catalysts during Fischer-Tropsch synthesis and to use these chemical principles in the design of catalysts suitable for slurry reactors. The performance targets are 88% CO+H{sub 2} conversion with less than 1% deactivation/day for 1 month and a methane and ethane selectivity of no more than 7% (based on hydrocarbons and oxygenates only) at a space velocity of at least 2 normal liters per hr per gram iron (NL/hr/gFe) using a synthesis gas with 0.5-1.0 H{sub 2}:CO ratio in a slurry reactor.
Date: May 6, 1992
Creator: Abrevaya, H.
Object Type: Report
System: The UNT Digital Library
A universal, fault-tolerant, non-linear analytic network for modeling and fault detection (open access)

A universal, fault-tolerant, non-linear analytic network for modeling and fault detection

The similarities and differences of a universal network to normal neural networks are outlined. The description and application of a universal network is discussed by showing how a simple linear system is modeled by normal techniques and by universal network techniques. A full implementation of the universal network as universal process modeling software on a dedicated computer system at EBR-II is described and example results are presented. It is concluded that the universal network provides different feature recognition capabilities than a neural network and that the universal network can provide extremely fast, accurate, and fault-tolerant estimation, validation, and replacement of signals in a real system.
Date: March 6, 1992
Creator: Mott, J. E. (Advanced Modeling Techniques Corp., Idaho Falls, ID (United States)); King, R. W.; Monson, L. R.; Olson, D. L. & Staffon, J. D. (Argonne National Lab., Idaho Falls, ID (United States))
Object Type: Article
System: The UNT Digital Library
The development of precipitated iron catalysts with improved stability (open access)

The development of precipitated iron catalysts with improved stability

The objective of this program is to identify the chemical principles governing the deactivation of precipitated iron catalysts during Fischer-Tropsch synthesis and to use these chemical principles in the design of catalysts suitable for slurry reactors. The performance targets are 88% CO+H{sub 2} conversion with less than 1% deactivation/day for 1 month and a methane and ethane selectivity of no more than 7% (based on hydrocarbons and oxygenates only) at a space velocity of at least 2 normal liters per hr per gram iron (NL/hr/gFe) using a synthesis gas with 0.5-1.0 H{sub 2}:CP ratio in a slurry reactor.
Date: May 6, 1992
Creator: Abrevaya, H.
Object Type: Report
System: The UNT Digital Library