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National Cutting Horse Association Summer Spectacular
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[Action alert]
Printout from the Dallas Gay and Lesbian Alliance requesting for constituents to call their congressperson before February 2, 1993 to register support for President Bill Clinton's decision to lift the ban on gays in the military. Lists the names and numbers of seven congresspersons.
Date:
1991
Creator:
Dallas Gay and Lesbian Alliance
Object Type:
Text
System:
The UNT Digital Library
Activated sludge studies of selected contaminants of PFH wastewater
Acetone, propionitrile, pyrrole, and thiocyanate were selected as representative compounds of wastewater expected from pressurized, fluidized-bed hydroretorting (PFH) of Eastern oil shales. The PFH process has been the subject of investigation by the Institute of Gas Technology, under contract with the United States Department of Energy, for the purpose of obtaining higher oil yields from Eastern shales than has been possible using conventional retorting methods. Preliminary batch experiments illustrated that acetone, propionitrile, pyrrole, and thiocyanate are aerobically biodegradable by heterogeneous microbiological cultures. Three continuous flow activated sludge reactors were used to further evaluate the biological treatability of the synthetic waste. The studies revealed that the compounds could be removed at hydraulic residence times of as low as one day. Three one-day experiments demonstrated that biological system's capability to accept organic shock loadings without a change in effluent quality. A no-recycle reactor illustrated that the flocculent microbiological population had a high resistance to solids washout. Because a supplementary nitrogen source was not included in synthetic waste treated by the no-recycle unit, it was shown that propionitrile, pyrrole, and/or thiocyanate supplied the nitrogen necessary for biological activity.
Date:
January 1, 1991
Creator:
Dudley, Sandra K.; Bustamante, R. B. & Bonner, W. P.
Object Type:
Article
System:
The UNT Digital Library
Activation analyses for different fusion structural alloys
The leading candidate structural materials, viz., the vanadium alloys, the nickel or the manganese stabilized austenitic steels, and the ferritic steels, are analysed in terms of their induced activation in the TPSS fusion power reactor. The TPSS reactor has 1950 MW fusion power and inboard and outboard average neutron wall loading of 3.75 and 5.35 MW/m{sup 2} respectively. The results shows that, after one year of continuous operation, the vanadium alloys have the least radioactivity at reactor shutdown. The maximum difference between the induced radioactivity in the vanadium alloys and in the other iron-based alloys occurs at about 10 years after reactor shutdown. At this time, the total reactor radioactivity, using the vanadium alloys, is about two orders of magnitude less than the total reactor radioactivity utilizing any other alloy. The difference is even larger in the first wall, the FW-vanadium activation is 3 orders of magnitude less than other alloys' FW activation. 2 refs., 7 figs.
Date:
January 1, 1991
Creator:
Attaya, H. & Smith, D.
Object Type:
Article
System:
The UNT Digital Library
Active and passive calcium transport systems in plant cells
The ability to change cytoplasmic Ca{sup 2+} levels ((Ca{sup 2+})) by cells has made this cation a key regulator of many biological processes. Cytoplasmic (Ca{sup 2+}) is determined by the coordination of passive Ca{sup 2+} fluxes which increase cytosolic (Ca{sup 2+}) and active Ca{sup 2+} transport systems that lower cytosolic (Ca{sup 2+}). The mechanisms by which plant cells achieve this is poorly understood. We have initially used isolated vesicles from the plasma membrane or organellar membranes to study Ca{sup 2+} transport systems in oat roots (a monocot) and carrot suspension cells (a dicot). The objectives of the proposal were to identify and characterize active (energy-dependent) and passive calcium transport systems that work together to regulate calcium levels in the cytoplasm of plant cells.
Date:
January 1, 1991
Creator:
Sze, H.
Object Type:
Report
System:
The UNT Digital Library
An active interlock system for the NSLS x-ray ring insertion devices
This paper describes the design and operation of an active interlock system which has been installed in the NSLS X-ray electron storage ing to protect the vacuum chamber from thermal damage by mis-steered high power photon beams from insertion devices (IDs). the system employs active beam position detectors to monitor beam motion in the ID straight sections and solid state logic circuitry to dump'' the stored beam in the event of a fault condition by interrupting the rf. To ensure a high degree of reliability, redundancy and continuous automatic checking has been incorporated into the design. Overall system integrity is checked periodically with beam at safe levels of beam current. 2 refs., 3 figs.
Date:
January 1, 1991
Creator:
Nawrocky, R.J.; Biscardi, R.; Dabrowski, J.; Flannigan, J.; Ramamoorthy, S.; Rothman, J. et al.
Object Type:
Article
System:
The UNT Digital Library
Active neutron multiplicity counting of bulk uranium
This paper describes a new nondestructive assay technique being developed to assay bulk uranium containing kilogram quantities of {sup 235}U. The new technique uses neutron multiplicity analysis of data collected with a coincidence counter outfitted with AmLi neutron sources. We have calculated the expected neutron multiplicity count rate and assay precision for this technique and will report on its expected performance as a function of detector design characteristics, {sup 235 }U sample mass, AmLi source strength, and source-to-sample coupling. 11 refs., 2 figs., 2 tabs.
Date:
January 1, 1991
Creator:
Ensslin, N.; Krick, M. S.; Langner, D. G. & Miller, M. C.
Object Type:
Article
System:
The UNT Digital Library
An active particle accelerator
Although a static charge is difficult to maintain on macroscopic particles, it is straightforward to construct a small object with a regularly oscillating electric dipole moment. For objects of a given size, one may then construct an accelerator by appropriately matching the frequency and separations of an external array of electrodes to this size. Physically feasible size ranges, an accelerator design, and possible applications of such systems are discussed. 8 refs., 9 figs.
Date:
January 1, 1991
Creator:
Goldman, T.
Object Type:
Article
System:
The UNT Digital Library
The active site of ribulose-bisphosphate carboxylase/oxygenase
The active site of ribulose-bisphosphate carboxylase/oxygenase requires interacting domains of adjacent, identical subunits. Most active-site residues are located within the loop regions of an eight-stranded {beta}/{alpha}-barrel which constitutes the larger C-terminal domain; additional key residues are located within a segment of the smaller N-terminal domain which partially covers the mouth of the barrel. Site-directed mutagenesis of the gene encoding the enzyme from Rhodospirillum rubrum has been used to delineate functions of active-site residues. 6 refs., 2 figs.
Date:
January 1, 1991
Creator:
Hartman, F. C.
Object Type:
Article
System:
The UNT Digital Library
Active Well Coincidence Counter measurements of enriched uranium fuel assemblies in scanning and stationary modes
Enriched uranium fuel assemblies were measured with an Active Well Coincidence Counter (AWCC) at the Beloyarskaya Nuclear Power Plant. Special AWCC inserts, electronics, and software were used. Stationary and scanning measurements were performed to establish calibrations and performance specifications for the assay of {sup 235}U and {sub 235}U/cm for BN600 fuel. 6 refs., 7 figs., 2 tabs.
Date:
January 1, 1991
Creator:
Krick, M.S.; Cowder, L. (Los Alamos National Lab., NM (United States)); Maltsev, V.; Chernikov, A.; Mokeenko, P.; D'yadkov, K. et al.
Object Type:
Article
System:
The UNT Digital Library
Activities of the PNC Nuclear Safety Working Group
The Nuclear Safety Working Group of the Pacific Nuclear Council promotes nuclear safety cooperation among its members. Status of safety research, emergency planning, development of lists of technical experts, severe accident prevention and mitigation have been the topics of discussion in the NSWG. This paper reviews and compares the severe accident prevention and mitigation program activities in some of the areas of the Pacific Basin region based on papers presented at a special session organized by the NSWG at an ANS Topical Meeting as well as papers from other sources.
Date:
January 1, 1991
Creator:
Kato, W.Y.
Object Type:
Article
System:
The UNT Digital Library
[Actors and film crew prepare for motorcade scene in "JFK"]
Photograph of actors and film crew preparing for the motorcade scene in "JFK."
Date:
1991
Creator:
Sprague, Joe M.
Object Type:
Photograph
System:
The Portal to Texas History
[Actors and film crew prepare for motorcade scene in "JFK"]
Photograph of actors and film crew preparing for the motorcade scene in "JFK."
Date:
1991
Creator:
Sprague, Joe M.
Object Type:
Photograph
System:
The Portal to Texas History
[Actors and film crew prepare for motorcade scene in "JFK"]
Photograph of actors and film crew preparing for the motorcade scene in "JFK."
Date:
1991
Creator:
Sprague, Joe M.
Object Type:
Photograph
System:
The Portal to Texas History
[Actors and film crew prepare for motorcade scene in "JFK"]
Photograph of actors and film crew preparing for the motorcade scene in "JFK."
Date:
1991
Creator:
Sprague, Joe M.
Object Type:
Photograph
System:
The Portal to Texas History
[Actors and film crew prepare for motorcade scene in "JFK"]
Photograph of actors and film crew preparing for the motorcade scene in "JFK."
Date:
1991
Creator:
Sprague, Joe M.
Object Type:
Photograph
System:
The Portal to Texas History
[Actors and film crew prepare for motorcade scene in "JFK"]
Photograph of actors and film crew preparing for the motorcade scene in "JFK."
Date:
1991
Creator:
Sprague, Joe M.
Object Type:
Photograph
System:
The Portal to Texas History
Acuff Quadrangle
Topographic map of a portion of Texas from the United States Geological Survey (USGS) project. The map includes towns, historic or notable sites, bodies of water, and other geologic features. Scale 1:24,000
Date:
1991
Creator:
Geological Survey (U.S.)
Object Type:
Map
System:
The Portal to Texas History
The acute spectral structure of single-domain YBa sub 2 Cu sub 3 O sub 6. 9
Extraordinarily sharp spectral features at binding energies near 1eV have been observed in the photoemission spectra of untwinned, single crystal YBa{sub 2}Cu{sub 3}O{sub 6.9}. This is the first observation of such distinctive electronic structure away from the near-Fermi Energy regime, It suggests that the entire valence band electronic structure, not merely the Fermiology, may provide insight into the nature of high temperature superconducting cuprates. 10 refs., 5 figs.
Date:
January 1, 1991
Creator:
Tobin, J. G.; Solal, F. R.; Fluss, J. M.; Olson, C. G.; Gu, C. & Liu, J. Z.
Object Type:
Article
System:
The UNT Digital Library
Adaptive techniques for reactor thermal-hydraulic calculations
Reliable modeling of reactor thermal-hydraulic behavior requires the ability to correlate measured behaviors of parameters, such as temperature and pressure, with simulated results. The objective of this work is to develop and investigate a technique to match measured thermal-hydraulic data with subsets of the modeled results through the appropriate adjustment of parameters within the numerical solution. Specifically, the correlation of measured and observed parameters in a least squares is developed.
Date:
January 1, 1991
Creator:
Boman, C.E. (Westinghouse Savannah River Co., Aiken, SC (United States)) & Doster, J.M. (North Carolina State Univ., Raleigh, NC (United States). Dept. of Nuclear Engineering)
Object Type:
Article
System:
The UNT Digital Library
Adaptive transfer functions
This paper details the approach and methodology used to build adaptive transfer functions in a feed-forward Back-Propagation neural network, and provides insight into the structure dependent properties of using non-scaled analog inputs. The results of using adaptive transfer functions are shown to outperform conventional architectures in the implementation of a mechanical power transmission gearbox design expert system knowledge base. 4 refs., 4 figs., 1 tab.
Date:
January 1, 1991
Creator:
Goulding, J.R. (Portland State Univ., OR (USA))
Object Type:
Article
System:
The UNT Digital Library
Addressing data heterogeneity: Lessons learned from a multimedia risk assessment
Cleanup activities are currently being conducted by the US Department of Energy (DOE) at a former chemical plant site that has been inactive for more than 20 years. The Army produced nitroaromatic explosives at the 220-acre site during the 1940s, and radioactive materials of the uranium and thorium series were processed there by DOE's predecessor agency during the 1950s and 1960s. Chemical and radioactive contaminants are present in soil, surface water, sediment, and groundwater at the site as a result of both past releases and disposal activities and subsequent contaminant migration. Samples have been collected from these media over a number of years under both DOE's environmental monitoring program and the site characterization program of the Superfund process. Results of samples analyses have been compiled in a computerized data base. These data are being evaluated in the context of potential exposure pathways that are currently present at the site or that may be present in the future, in order to estimate possible adverse impacts to human health and the environment in the absence of cleanup. This paper discusses the methodology used to address associated tasks and the lessons learned during the assessment process. Statistical issues and recommended future directions for …
Date:
January 1, 1991
Creator:
Oezkaynak, H.; Xue, Jianping; Butler, D.A. (Harvard Univ., Cambridge, MA (United States)); Haroun, L.A.; MacDonell, M.M. & Fingleton, D.J. (Argonne National Lab., IL (United States))
Object Type:
Article
System:
The UNT Digital Library
Addressing earthquake strong ground motion issues at the Idaho National Engineering Laboratory
In the course of reassessing seismic hazards at the Idaho National Engineering Laboratory (INEL), several key issues have been raised concerning the effects of the earthquake source and site geology on potential strong ground motions that might be generated by a large earthquake. The design earthquake for the INEL is an approximate moment magnitude (M{sub w}) 7 event that may occur on the southern portion of the Lemhi fault, a Basin and Range normal fault that is located on the northwestern boundary of the eastern Snake River Plain and the INEL, within 10 to 27km of several major facilities. Because the locations of these facilities place them at close distances to a large earthquake and generally along strike of the causative fault, the effects of source rupture dynamics (e.g., directivity) could be critical in enhancing potential ground shaking at the INEL. An additional source issue that has been addressed is the value of stress drop to use in ground motions predictions. In terms of site geology, it has been questioned whether the interbedded volcanic stratigraphy beneath the ESRP and the INEL attenuates ground motions to a greater degree than a typical rock site in the western US. These three issues …
Date:
January 1, 1991
Creator:
Wong, Ivan G.; Silva, Walter J.; Stark, Cathy L.; Jackson, Suzette & Smith, Richard P.
Object Type:
Article
System:
The UNT Digital Library
Addressing mixed waste in plutonium processing
The overall goal is the minimization of all waste generated in actinide processing facilities. Current emphasis is directed toward reducing and managing mixed waste in plutonium processing facilities. More specifically, the focus is on prioritizing plutonium processing technologies for development that will address major problems in mixed waste management. A five step methodological approach to identify, analyze, solve, and initiate corrective action for mixed waste problems in plutonium processing facilities has been developed.
Date:
January 1, 1991
Creator:
Christensen, D.C.; Sohn, C.L. (Los Alamos National Lab., NM (United States)) & Reid, R.A. (New Mexico Univ., Albuquerque, NM (United States). Anderson Schools of Management)
Object Type:
Article
System:
The UNT Digital Library
Adiabatic Disruption of Asymmetric Colliding Beams
A scheme is considered for enhancing the luminosity of electron-positron colliders. One of the beams is taken to be much denser than the other and effectively becomes a lens for the second beam. The luminosity enhancement afforded by this asymmetric disruption process is estimated analytically. The scheme is severely limited by the kink instability which is characterized by a two-stream dispersion relation, and a constraint on the density of the less dense beam is found for which the instability is gradient stabilized.
Date:
January 1, 1991
Creator:
Katsouleas, T. (University of Southern California, Los Angeles, CA (United States). Dept. of Electrical Engineering Electrophysics) & Wurtele, J.S. (Massachusetts Inst. of Tech., Cambridge, MA (United States). Dept. of Physics)
Object Type:
Article
System:
The UNT Digital Library