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[Press release: First AIDS treatment activists conference to be held in Washington, D.C.]
Press release announcing the first national conference on AIDS/HIV treatment.
Date:
November 22, 1990
Creator:
ACT UP
Object Type:
Text
System:
The UNT Digital Library
The Paducah Post (Paducah, Tex.), Vol. 84, No. 38, Ed. 1 Wednesday, November 7, 1990
Weekly newspaper from Paducah, Texas that includes local, state, and national news along with advertising.
Date:
November 7, 1990
Creator:
Adams, Patty
Object Type:
Newspaper
System:
The Portal to Texas History
The Paducah Post (Paducah, Tex.), Vol. 84, No. 39, Ed. 1 Wednesday, November 14, 1990
Weekly newspaper from Paducah, Texas that includes local, state, and national news along with advertising.
Date:
November 14, 1990
Creator:
Adams, Patty
Object Type:
Newspaper
System:
The Portal to Texas History
The Paducah Post (Paducah, Tex.), Vol. 84, No. 40, Ed. 1 Wednesday, November 21, 1990
Weekly newspaper from Paducah, Texas that includes local, state, and national news along with advertising.
Date:
November 21, 1990
Creator:
Adams, Patty
Object Type:
Newspaper
System:
The Portal to Texas History
The Paducah Post (Paducah, Tex.), Vol. 84, No. 41, Ed. 1 Wednesday, November 28, 1990
Weekly newspaper from Paducah, Texas that includes local, state, and national news along with advertising.
Date:
November 28, 1990
Creator:
Adams, Patty
Object Type:
Newspaper
System:
The Portal to Texas History
High-efficiency large-area CdTe panels
The objective of this three year effort has been to develop an improved materials technology and fabrication process for limited volume production of 1 ft{sup 2} and 4 ft{sup 2} CdS/CdTe photovoltaic modules. The module stability objective by the end of this three year subcontract was to develop techniques to provide ten year life exploration with no greater than 10% degradation. In order to achieve these efficiency and stability objectives, the research program has been separated into tasks including: (1) analysis and characterization of CdS/CdTe Devices; (2) performance optimization on small cells; (3) encapsulation and stability testing; and (4) module efficiency optimization. 27 refs., 18 figs., 3 tabs.
Date:
November 1, 1990
Creator:
Albright, S. P.; Chamberlin, R. R. & Jordan, J. F.
Object Type:
Report
System:
The UNT Digital Library
High-efficiency large-area CdTe panels. Final subcontract report, June 1987--July 1990
The objective of this three year effort has been to develop an improved materials technology and fabrication process for limited volume production of 1 ft{sup 2} and 4 ft{sup 2} CdS/CdTe photovoltaic modules. The module stability objective by the end of this three year subcontract was to develop techniques to provide ten year life exploration with no greater than 10% degradation. In order to achieve these efficiency and stability objectives, the research program has been separated into tasks including: (1) analysis and characterization of CdS/CdTe Devices; (2) performance optimization on small cells; (3) encapsulation and stability testing; and (4) module efficiency optimization. 27 refs., 18 figs., 3 tabs.
Date:
November 1, 1990
Creator:
Albright, S. P.; Chamberlin, R. R. & Jordan, J. F.
Object Type:
Report
System:
The UNT Digital Library
A guide to experimental elementary particle physics literature, 1985--1989
We present an indexed guide to experimental high energy physics literature for the years 1985--1989. No actual data are given, but approximately 3500 papers are indexed by Beam/Target/Momentum, Reaction/Momentum (including the final stare), Final State Particle, and Accelerator/Experiment/ Detector.
Date:
November 1, 1990
Creator:
Alekhin, S. I.; Bazeeva, V. V.; Ezhela, V. V.; Filimonov, B. B.; Lugovsky, S. B.; Nikolaev, A. S. et al.
Object Type:
Report
System:
The UNT Digital Library
Three dimensional visualization breakthrough in analysis and communication of technical information for nuclear waste management
Computer graphics systems that provide interactive display and manipulation of three-dimensional data are powerful tools for the analysis and communication of technical information required for characterization and design of a geologic repository for nuclear waste. Greater understanding of site performance and repository design information is possible when performance-assessment modeling results can be visually analyzed in relation to site geologic and hydrologic information and engineering data for surface and subsurface facilities. In turn, this enhanced visualization capability provides better communication between technical staff and program management with respect to analysis of available information and prioritization of program planning. A commercially-available computer system was used to demonstrate some of the current technology for three-dimensional visualization within the architecture of systems for nuclear waste management. This computer system was used to interactively visualize and analyze the information for two examples: (1) site-characterization and engineering data for a potential geologic repository at Yucca Mountain, Nevada; and (2) three-dimensional simulations of a hypothetical release and transport of contaminants from a source of radionuclides to the vadose zone. Users may assess the three-dimensional distribution of data and modeling results by interactive zooming, rotating, slicing, and peeling operations. For those parts of the database where information is …
Date:
November 1, 1990
Creator:
Alexander, D. H.; Cerny, B. A.; Hill, E. R.; Krupka, K. M.; Smoot, J. L.; Smith, D. R. et al.
Object Type:
Article
System:
The UNT Digital Library
Thermal spike model of ion-induced grain growth
A thermal spike model has been developed to describe the phenomenon of ion irradiation-induced grain growth in metal alloy thin films. In single phase films where the driving force for grain growth is the reduction of grain boundary curvature, the model shows that ion-induced grain boundary mobility, M{sub ion}, is proportional to the quantity F{sub D}{sup 2}/{Delta}H{sub coh}{sup 3}, where F{sub D} is the deposited ion damage energy and {Delta}H{sub coh} is the cohesive energy of the element or alloy. Experimental strain growth results from ion irradiated coevaporated binary alloy films compare favorably with model predictions. 11 refs., 1 fig., 1 tab.
Date:
November 1, 1990
Creator:
Alexander, D.E. (Argonne National Lab., IL (USA)) & Was, G.S. (Michigan Univ., Ann Arbor, MI (USA). Dept. of Nuclear Engineering)
Object Type:
Article
System:
The UNT Digital Library
In situ study of the effects of heavy-ion irradiation on co-evaporated CoSi sub 2 films
The in situ ion irradiation capability of Argonne's HVEM-Tandem User Facility has been employed to determine the effects of 1.5 MeV Kr{sup +} irradiation and 300 kV electron irradiation on the crystallization of as-deposited and of partially crystallized 40 nm thick films of CoSi{sub 2}. Ion fluxes ranged from 8.5 {times} 10{sup 14} to 6.8 {times} 10{sup 15} m{sup {minus}2}s{sup {minus}1} for which beam heating effects may be neglected. The maximum electron flux at 300 kV was 0.8 {times} 10{sup 23} m{sup {minus}2}s{sup {minus}1}. The maximum temperature at which crystalline CoSi{sub 2} is amorphized by the ion irradiation of flux = 6.8 {times} 10{sup 15} m{sup {minus}2}s{sup {minus}1} is between 250 and 280 K. At higher temperatures amorphous material crystallizes by growth of any preexisting crystals and by classical nucleation and growth, with radial growth rates which are proportional to ion flux. The average degree of transformation per ion is 4 {times} 10{sup {minus}26} m{sup 3} per ion. Thermally induced crystallization of as-deposited films occurs above approximately 420 K. For ion doses at least as low as 3.4 {times} 10{sup 16} m{sup {minus}2} ion irradiation at 300 K promotes thermal crystallization at 450 K, by virtue of enhanced apparant nucleation …
Date:
November 1, 1990
Creator:
Allen, C.W. (Argonne National Lab., IL (USA)) & Smith, D.A. (International Business Machines Corp., Yorktown Heights, NY (USA). Thomas J. Watson Research Center)
Object Type:
Article
System:
The UNT Digital Library
Parameter estimation of structural dynamic models using eigenvalue and eigenvector information
Structural system identification methods are analytical techniques for reconciling test data with analytical models. The response data frequently used to compare a finite element model and test data are the eigenvalues of the system. However, eigenvalues alone cannot assure an adequate model. Eigenvectors also provide valuable information for the process of updating finite element models. For large order, complex finite element models, ad-hoc procedures have often proven inadequate for model parameter updating. Therefore, parameter estimation techniques such as Bayes estimation or mathematical programming have been applied. Mathematical programming techniques can be use for parameter estimation allowing a very general definition of the objective function and constraints. This paper will present the application of mathematical programming techniques of parameter estimation to the updating of a finite element model of an electronic package. The following topics will be discussed in the paper. The mathematical programming formulation of the parameter estimation problem, which uses both eigenvalue and eigenvector response data. The software implementation of this technique. The application of this methodology to the estimation of parameters of an electronics package model.
Date:
November 1, 1990
Creator:
Allen, James J. & Martinez, David R.
Object Type:
Article
System:
The UNT Digital Library
Hadroproduction of charm at Fermilab E769
Experiment E769 at Fermilab obtained charm hadroproduction data during the 1987-88 Fixed Target running period with a 250 GeV hadron beam incident on thin target foils of Be, Al, Cu, and W. From an analysis of 25% of the recorded 400M trigger sample we have explored the Feynman x, p{sub t}{sup 2} and the atomic number dependence of charm quark production using samples of D{sup +} and D{sup 0} mesons. 7 refs., 4 figs.
Date:
November 15, 1990
Creator:
Alves, G. A.; Anjos, J. C.; de Mello Neto, J. R. T.; de Miranda, J. M.; da Motta, H.; dos Reis, A. C. et al.
Object Type:
Article
System:
The UNT Digital Library
Southwest Retort, Volume 44, Number [8], November 1990
This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community.
Date:
November 1990
Creator:
American Chemical Society. Dallas/Fort Worth Section.
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
Guidance Document for Prepermit Bioassay Testing of Low-Level Radioactive Waste
In response to the mandate of Public Law 92-532, the Marine Protection, Research, and Sanctuaries Act (MPRSA) of 1972, as amended, the Environmental Protection Agency (EPA) has developed a program to promulgate regulations and criteria to control the ocean disposal of radioactive wastes. The EPA seeks to understand the mechanisms for biological response of marine organisms to the low levels of radioactivity that may arise from the release of these wastes as a result of ocean-disposal practices. Such information will play an important role in determining the adequacy of environmental assessments provided to the EPA in support of any disposal permit application. Although the EPA requires packaging of low-level radioactive waste to prevent release during radiodecay of the materials, some release of radioactive material into the deep-sea environment may occur when a package deteriorates. Therefore, methods for evaluating the impact on biota are being evaluated. Mortality and phenotypic responses are not anticipated at the expected low environmental levels that might occur if radioactive materials were released from the low-level waste packages. Therefore, traditional bioassay systems are unsuitable for assessing sublethal effects on biota in the marine environment. The EPA Office of Radiation Programs (ORP) has had an ongoing program to …
Date:
November 1, 1990
Creator:
Anderson, Susan L. & Harrison, Florence L.
Object Type:
Report
System:
The UNT Digital Library
Studies in theoretical high energy particle physics
This report discusses String models and field theories in High Energy Physics. Symmetry principles are discussed as well as elementary particle interactions. (LSP)
Date:
November 1, 1990
Creator:
Aratyn, H.; Brekke, L.; Keung, Wai-Yee, Panigrahi, P. & Sukhatme, U.
Object Type:
Report
System:
The UNT Digital Library
Strangeonium production from LASS
Results from recent studies of strangeonium mesons produced in the LASS spectrometer by an 11 GeV/c K{sup {minus}} beam are presented. Data fro new analyses of K*{bar K}*, {phi}{phi}, and {eta}{pi}{pi} final states are described. Comparisons are made with results from other hadroproduction, radiative J/{Psi} decay, and {gamma}{gamma} experiments. 24 refs., 5 figs., 2 tabs.
Date:
November 1, 1990
Creator:
Aston, D.; Bienz, T.; Bird, F.; Dunwoodie, W.; Johnson, W. B.; Kunz, P. et al.
Object Type:
Article
System:
The UNT Digital Library
New results on hypercharge exchange reactions from LASS
New results from a number of final states ({eta}{pi}{sup {minus}}{pi}{sup +},{bar K}*K*,{phi}{phi}) produced by hypercharge exchange in LASS by an 11 GeV/cK{sup {minus}} beam are described, and compared with results from other hadroproduction modes and from G/{psi} decay.
Date:
November 1, 1990
Creator:
Aston, D.; Bienz, T.; Dunwoodie, W.; Johnson, W.B.; Kunz, P.; Kwon, Y. et al.
Object Type:
Article
System:
The UNT Digital Library
The effect of friction on simulated containment of underground nuclear explosions
The strength of the residual stress field is used as an important indicator in assessing the containment of underground nuclear explosions. Containment analysis using the COTTAGE geology shows considerable cracking in the hard Paleozoic layer, just below the cavity. The coefficient of friction is the ratio of total shear stress applied to a closed fracture surface to normal applied compressive total stress. Without any friction, the Paleozoic residual stress field is weakest. As the friction coefficient is increased from 0 to 0.5, the Paleozoic residual stress field is strengthened. A further increase of the friction coefficient from 0.5 to 0.8 shows strengthened where cracks are closed and weakening where cracks remain open. 4 refs., 4 figs., 1 tab.
Date:
November 1, 1990
Creator:
Attia, A. V.
Object Type:
Article
System:
The UNT Digital Library
ARCHY User`s Manual
This document tells how to use the system of programs called ARCHY ( Analysis and Reverse Engineering for Code with Hierarchy and Yourdon Diagrams). This document consists of an introduction which gives an overview of ARCHY and the problem that it solves, an explanation of how to use the ARCHY menu system, and detailed explanations of the menu choices within ARCHY. The structure of the ARCHY database is in Appendix A.
Date:
November 1, 1990
Creator:
Aull, J. E.; Hire, G. L. & Pevey, R. E.
Object Type:
Report
System:
The UNT Digital Library
A Central Refrigeration System to Support Multiple Environmental Test Chambers: Design, Development, and Evaluation
A pilot plant project was undertaken to develop a central refrigeration compressor station capable of providing the necessary cooling to a network of nine independently-controlled environmental test chambers operating at temperatures of {minus}85{degree}F to 350{degree}F. Design features of the central two-stage (cascade) vapor compression refrigeration system are described. Computer control of the central refrigeration station is a major contribution to the improved efficiency of the overall system. A second computer-control system was developed to perform the task of environmental chamber control, test management, and chamber performance monitoring. Data on performance of the Climatic Central Refrigeration System (CCRS) are presented. 7 refs., 18 figs.
Date:
November 1, 1990
Creator:
Baca, R.G.; Miller, K.M. & Shipley, K.L.
Object Type:
Report
System:
The UNT Digital Library
Supersymmetry: Current Status and Future Prospects
We review the most recent data from e{sup +}e{sup {minus}} and p{bar p} colliders and discuss the resulting constraints on the parameters of the Minimal Supersymmetric Standard Model, and their implications for future supersymmetry searches. We review the patterns of cascade decays of squarks and gluinos and discuss the present status of supersymmetry event generators for hadron colliders. We present the results of detailed simulations of E{sub T} and same sign dilepton events from supersymmetry at the Tevatron. Although the E{sub T} signal continues to be viable, it is concluded that the same sign dilepton signal may be too small unless squarks and gluinos are approximately degenerate. The E{sub T} and the same-sign dilepton signals from supersymmetry and the Standard Model backgrounds at the SSC are also discussed in detail. We also discuss other promising ways of searching for supersymmetry at the SSC including events containing Z{degree} bosons, and events containing n isolated leptons (n {ge} 3). Finally, we discuss how supersymmetry searches might be modified if the Higgs sectors is more complicated or if R-parity is not conserved due to baryon number violating interactions. 49 refs., 12 figs.
Date:
November 1, 1990
Creator:
Baer, H.; White, A.; Amos, N.; Beretvas, A.; Barnett, R.M.; Bhattacharya, G. et al.
Object Type:
Article
System:
The UNT Digital Library
West Valley Facility Spent Fuel Handling, Storage, and Shipping Experience
The result of a study on handling and shipping experience with spent fuel are described in this report. The study was performed by Pacific Northwest Laboratory (PNL) and was jointly sponsored by the US Department of Energy (DOE) and the Electric Power Research Institute (EPRI). The purpose of the study was to document the experience with handling and shipping of relatively old light-water reactor (LWR) fuel that has been in pool storage at the West Valley facility, which is at the Western New York Nuclear Service Center at West Valley, New York and operated by DOE. A subject of particular interest in the study was the behavior of corrosion product deposits (i.e., crud) deposits on spent LWR fuel after long-term pool storage; some evidence of crud loosening has been observed with fuel that was stored for extended periods at the West Valley facility and at other sites. Conclusions associated with the experience to date with old spent fuel that has been stored at the West Valley facility are presented. The conclusions are drawn from these subject areas: a general overview of the West Valley experience, handling of spent fuel, storing of spent fuel, rod consolidation, shipping of spent fuel, crud …
Date:
November 1, 1990
Creator:
Bailey, W. J.
Object Type:
Report
System:
The UNT Digital Library
Beam loss and radiation effects in the SSC lattice elements
The Superconducting Super Collider (SSC) is designed to be an advanced machine with relatively low beam loss-induced radiation levels. However, a fraction of the beam lost in the lattice due to pp-collisions at the interaction points, beam-gas scattering, bearn-halo scraping, various instabilities and errors will result in the irradiation of conventional and superconducting components of the accelerator and experimental apparatus. The level of the beam loss and its distribution along the machine structure has impact on all of the three crucial radiation effects at the SSC: quenching of the superconducting magnets, survivability of the accelerator and detectors components in the near-beam regions, and influence to the environment. This paper, based on the full-scale Monte Carlo simulation, will explore all major sources of beam loss in the Collider and measures to reduce the irradiation of the accelerator components. Basic parameters of the Super Collider accepted throughout this report are as follows: Proton energy E{sub 0} = 20 TeV, injection energy is 2 TeV, number of protons circulating in each of the collider rings is N = 1.3 {times} 10{sup 14}, circumference is 87.12 km, the transverse normalized emittance {var_epsilon}{sub N}({sigma}) = 1 {pi} mm-mrad, for the regular lattice ({beta} = 305 …
Date:
November 1, 1990
Creator:
Baishev, I. S.; Drozhdin, A. I. & Mokhov, N. V.
Object Type:
Report
System:
The UNT Digital Library