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3-D Field Computations for Accelerator Magnets Using Finite Element and Integral Codes

Description: Two dimensional (2-D) computation has been an accepted part of the design of accelerator magnets since the 1960's, but three-dimensional (3-D) computations are still not fully trusted. This paper describes the successes and limitations of 3-D computations, as applied to accelerator magnets for the Advanced Photon Source (APS) at Argonne National Laboratory (ANL). Both the finite element code TOSCA and the edge element volume integral code CORAL have been used in these computations. The ends of the dipole bending magnet for the injector synchrotron were designed using TOSCA; comparisons with measurements are described. Computation of other APS magnets are also described.
Date: 1992~
Creator: Turner, L. R.; Kim, S. H.; Kim, K. & Kettunen, L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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3-D numerical investigation of the mantle dynamics associated with the breakup of Pangea

Description: Three-dimensional finite element calculations in spherical geometry are performed to study the response of the mantle with platelike blocks at its surface to an initial condition corresponding to subduction along the margins of Pangea. The mantle is treated as an infinite Prandtl number Boussinesq fluid inside a spherical shell with isothermal, undeformable, free-slip boundaries. Nonsubducting rigid blocks to model continental lithosphere are included in the topmost layer of the computational mesh. At the beginning of the numerical experiments these blocks represent the present continents mapped to their approximate Pangean positions. Asymmetrical downwelling at the margins of these nonsubducting blocks results in a pattern of stresses that acts to pull the supercontinent apart. The calculations suggest that the breakup of Pangea and the subsequent global pattern of seafloor spreading was driven largely by the subduction at the Pangean margins.
Date: January 1, 1992
Creator: Baumgardner, J. R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department

92-204

Description: The background of this painting consists of gradations of red, orange, pink and gray hues layered with lines created by many dots of paint. Overlayed are images of running dogs and small geometric shapes.
Date: 1992
Creator: Falsetta, Vincent
Item Type: Refine your search to only Artwork
Partner: UNT College of Visual Arts + Design
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101-SY Hydrogen Safety Project chemical analysis support: Window ``C`` total organic carbon analysis

Description: Core samples taken from Hanford double-shell waste tank 101-SY during Window ``C`` (after the May 1991 gas release event) were analyzed for total organic carbon by the staff of the Analytical Chemistry Laboratory at Pacific Northwest Laboratory. The procedure uses the oxidation/extraction method of hot acid persulfate oxidation. Evolved CO{sub 2} is measured by a UIC Coulometric Carbon Analyzer coulometry detector. Samples are acidified with heated sulfuric acid to drive off all inorganic carbonate carbon as CO{sub 2}. Excess potassium persulfate oxidant, along with a silver catalyst, is then added to the heated sulfuric acid solution. All organic carbon is oxidized to CO{sub 2}, swept away by the carrier gas to the Coulometrics Analyzer, and the results calculated and displayed directly as {mu}g carbon titrated.
Date: January 1, 1992
Creator: Gillespie, B. M.; Stromatt, R. W.; Baldwin, D. L. & Hoopes, F. V.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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101-SY Hydrogen Safety Project chemical analysis support: Window C'' total organic carbon analysis

Description: Core samples taken from Hanford double-shell waste tank 101-SY during Window C'' (after the May 1991 gas release event) were analyzed for total organic carbon by the staff of the Analytical Chemistry Laboratory at Pacific Northwest Laboratory. The procedure uses the oxidation/extraction method of hot acid persulfate oxidation. Evolved CO{sub 2} is measured by a UIC Coulometric Carbon Analyzer coulometry detector. Samples are acidified with heated sulfuric acid to drive off all inorganic carbonate carbon as CO{sub 2}. Excess potassium persulfate oxidant, along with a silver catalyst, is then added to the heated sulfuric acid solution. All organic carbon is oxidized to CO{sub 2}, swept away by the carrier gas to the Coulometrics Analyzer, and the results calculated and displayed directly as {mu}g carbon titrated.
Date: January 1, 1992
Creator: Gillespie, B. M.; Stromatt, R. W.; Baldwin, D. L. & Hoopes, F. V.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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500 MW demonstration of advanced wall-fired combustion techniques for the reduction of nitrogen oxide (NO[sub x]) emissions from coal-fired boilers

Description: The project provides a stepwise retrofit of an advanced overfire air (AOFA) system followed by low NO[sub x] burners (LNB). During each test phase of the project, diagnostic, performance, long-term, and verification testing will be performed. These tests are used to quantify the NO[sub x] reductions of each technology and evaluate the effects of those reductions on other combustion parameters such as particulatecharacteristics and boiler efficiency. Baseline, AOFA, and LNB without AOFA test segments have been completed. Analysis of the 94 days of LNB long-term data collected show the full-load NO[sub x] emission levels to be approximately 0.65 lb/MBtu. Flyash LOI values for the LNB configuration are approximately 8 percent at full-load. Corresponding values for the AOFA configuration are 0.94 lb/MBtu and approximately 10 percent. Abbreviated diagnostic tests for the LNB+AOFA configuration indicate that at 500 MWe, NO[sub x] emissions are approximately 0.55 lb/MBtu with corresponding flyash LOI values of approximately 11 percent. For comparison, the long-term full-load, baseline NO[sub x] emission level was approximately 1.24 lb/MBtu at 5.2 percent LOI. Comprehensive testing of the LNB+AOFA configuration will be performed when the stackparticulate emissions issue is resolved. Testing of a process optimization package on Plant Hammond Unit 4 was performed during this quarter. The software was configured to minimize NO[sub x] emissions using total combustion air flow and advanced overfire air distribution as the controlled parameters. Preliminary results from this testing indicate that this package shows promise in reducing NO[sub x] emissions while maintaining or improving other boiler performance parameters.
Date: January 1, 1992
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The 1991 natural gas vehicle challenge: Developing dedicated natural gas vehicle technology

Description: An engineering research and design competition to develop and demonstrate dedicated natural gas-powered light-duty trucks, the Natural Gas Vehicle (NGV) Challenge, was held June 6--11, 1191, in Oklahoma. Sponsored by the US Department of Energy (DOE), Energy, Mines, and Resources -- Canada (EMR), the Society of Automative Engineers (SAE), and General Motors Corporation (GM), the competition consisted of rigorous vehicle testing of exhaust emissions, fuel economy, performance parameters, and vehicle design. Using Sierra 2500 pickup trucks donated by GM, 24 teams of college and university engineers from the US and Canada participated in the event. A gasoline-powered control testing as a reference vehicle. This paper discusses the results of the event, summarizes the technologies employed, and makes observations on the state of natural gas vehicle technology.
Date: January 1, 1992
Creator: Larsen, R.; Rimkus, W. (Argonne National Lab., IL (United States)); Davies, J. (General Motors of Canada Ltd., Toronto, ON (Canada)); Zammit, M. (AC Rochester, NY (United States)) & Patterson, P. (USDOE, Washington, DC (United States))
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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1992 Columbia River Salmon Flow Measures Options Analysis/EIS.

Description: This Options Analysis/Environmental Impact Statement (OA/EIS) identifies, presents effects of, and evaluates the potential options for changing instream flow levels in efforts to increase salmon populations in the lower Columbia and Snake rivers. The potential actions would be implemented during 1992 to benefit juvenile and adult salmon during migration through eight run-of-river reservoirs. The Corps of Engineers (Corps) prepared this document in cooperation with the Bonneville Power Administration and the Bureau of Reclamation. The US Fish and Wildlife Service (FSWS) is a participating agency. The text and appendices of the document describe the characteristics of 10 Federal projects and one private water development project in the Columbia River drainage basin. Present and potential operation of these projects and their effects on the salmon that spawn and rear in the Columbia and Snake River System are presented. The life history, status, and response of Pacific salmon to current environmental conditions are described.
Date: January 1, 1992
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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1992 Columbia River Salmon Flow Measures Options Analysis/EIS : Appendices.

Description: This Options Analysis/Environmental Impact Statement (OA/EIS) identifies, presents effects of, and evaluates the potential options for changing instream flow levels in efforts to increase salmon populations in the lower Columbia and Snake rivers. The potential actions would be implemented during 1992 to benefit juvenile and adult salmon during migration through eight run-of-river reservoirs. The Corps of Engineers (Corps) prepared this document in cooperation with the Bonneville Power Administration and the Bureau of Reclamation. The US Fish and Wildlife Service (FWS) is a participating agency. The text and appendices of the document describe the characteristics of 10 Federal projects and one private water development project in the Columbia River drainage basin. Present and potential operation of these projects and their effects on the salmon that spawn and rear in the Columbia and Snake River System are presented. The life history, status, and response of Pacific salmon to current environmental conditions are described. The document concludes with an evaluation of the potential effects that could result from implementing proposed actions. The conclusions are based on evaluation of existing data, utilization of numerical models, and application of logical inference. This volume contains the appendices.
Date: January 1, 1992
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department

[1992 election results analysis]

Description: Statistics packet including an analysis of the 1992 Presidential elections in selected precincts and by senatorial districts. Includes an analysis of selected precincts in contested judicial races and an analysis of voter turnout (duplicate of UNTA_AR0887-02-03-002).
Date: 1992
Creator: Lesbian/Gay Political Coalition of Dallas
Item Type: Refine your search to only Dataset
Partner: UNT Libraries Special Collections

[1992 election results analysis]

Description: Statistics packet including an analysis of the 1992 Presidential elections in selected precincts and by senatorial districts. Includes an anlysis of selected precincts in contested judicial races and an analysis of voter turnout (duplicate of UNTA_AR0887-02-03-001).
Date: 1992
Creator: Lesbian/Gay Political Coalition of Dallas
Item Type: Refine your search to only Dataset
Partner: UNT Libraries Special Collections
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1992 Fact Sheet, North Texas Institute for Educators on the Visual Arts

Description: Photocopy of a document that lists out the districts served by NTIEVA and breaks down the institutions, teachers, and students served. The document also lists the members involved in the project and the goals that they have for the program.
Date: 1992
Creator: North Texas Institute for Educators on the Visual Arts
Item Type: Refine your search to only Report
Partner: UNT Libraries Special Collections
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[1992 NTIEVA Fact Sheet]

Description: A 1992 fact sheet for the North Texas Institute for Educators on the Visual Arts. The fact sheet list the consortium members, programs, participants, financial support, Texas-adopted curricula, and describes the project goals of NTIEVA.
Date: 1992
Creator: North Texas Insitute for Educators on the Visual Arts
Item Type: Refine your search to only Letter
Partner: UNT Libraries Special Collections
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[1992 NTIEVA Grant Application Comments and Funding History]

Description: A comment section and funding history section from the Texas Commission on the Arts in regard to a project from the North Texas Institute for Educators on the Visual Arts. TCA notes that the project "is well on its way" and has "an interesting combination of major institutions and educational concerns". The section at the bottom of the document shows the previous funding history from NTIEVA in regards to TCA grants. Previous grants include "1991 Summer Institute Support", "TX Touring Presenter Program 1990-91", and "Institute Preparatory Sessions".
Date: 1992
Creator: Texas Commission on the Arts
Item Type: Refine your search to only Letter
Partner: UNT Libraries Special Collections
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[1992 Primary Election Questionnaires and Information]

Description: A group of documents pertaining to the candidates of the 1992 primary elections. The group includes blank and filled out questionnaires for the candidates, a schedule of when they'll be screened, handwritten notes about some of the candidates, and unspecified diagrams.
Date: January 1992
Creator: Lesbian/Gay Political Coalition of Dallas
Item Type: Refine your search to only Text
Partner: UNT Libraries Special Collections
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33rd Annual Report

Description: The ACIR Library is composed of publications that study the interactions between different levels of government. This document is an annual report.
Date: January 1992
Creator: United States. Advisory Commission on Intergovernmental Relations.
Item Type: Refine your search to only Book
Partner: UNT Libraries Government Documents Department

[AAT documents, 1992]

Description: Documents containing information about the summer 1992 advanced academic training program. Documents include: repeats, a credit recipient list, unnamed certificates, a report form, a letter from the TEA with attached pages from the Texas Administrative Code, and a Statement of Assurance.
Date: 1992
Item Type: Refine your search to only Collection
Partner: UNT Libraries Special Collections
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Absorption of undulator radiation in media

Description: Detailed thermal stress analyses of beamline and optical components subject to high heat loads require an Accurate determination of the absorbed power profile for accurate prediction of the temperature profile and structural parameters. This is particularly important for high power beams from wigglers and undulators at the third generation synchrotron sources because components must, in general, be designed and maintained with strict mechanical tolerances. The spatial distribution of the power density of an undulator is a rapidly varying function of the energy of the photons suggesting that approximative methods based on a smooth spectral variation may not be valid. In this paper, a fast code for calculating undulator spectra is developed and compared with a wiggler code for approximation of the same spectra. Results from numerical simulations, including the emittance of the stored particle beam, are presented for the absorbed power density in a beryllium window. We find markedly different results for the two models for far off-axis radiation indicating the inadequacy of the wiggler model applied to an undulator spectrum in this case. The wiggler model overestimates the total absorbed power by as much as 82% for the beryllium window.
Date: January 1, 1992
Creator: Dejus, R. J.; Lai, B. & Khounsary, A. M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Accelerated glass reaction under PCT conditions

Description: Static leach tests similar to PCT (Product Consistency Test) were performed for up to 2 years to assess long-term reaction behavior of high-level nuclear waste glasses similar to those at Defense Waste Processing Facility. These tests show the reaction rate to decrease with the reaction time from an initially high rate to a low rate, but then to accelerate to a higher rate after reaction times of about 1 year, depending on glass surface area/leachant volume ratio used. Solution concentrations of soluble glass components increase as the reaction is accelerated, while release of other glass components into solution is controlled by secondary phases. Net result is that transformation of glass to stable phases is accelerated while the solution becomes enriched in soluble components not effectively contained in secondary phases. Rate becomes linear in time after the acceleration and may be similar to the initial forward rate. A current model of glass reaction predicts that the glass reaction will be accelerated upon the formation of secondary phases which lower the silicic acid solution concentration. These tests show total Si concentration to increase upon reaction acceleration, however, which may be due to the slightly higher pH attained with the acceleration. The sudden change in the reaction rate is likely due to secondary phase formation. 17 refs, 2 tabs, 3 figs.
Date: January 1, 1992
Creator: Ebert, W.L.; Bates, J.K.; Buck, E.C. & Bradley, C.R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Accelerator research studies

Description: The Accelerator Research Studies program at the University of Maryland, sponsored by the Department of Energy under grant number DE-FG05-91ER40642, is currently in the first year of a three-year funding cycle. The program consists of the following three tasks: TASK A, Study of Transport and Longitudinal Compression of Intense, High-Brightness Beams, TASK B, Study of Collective Ion Acceleration by Intense Electron Beams and Pseudospark Produced High Brightness Electron Beams; TASK C, Study of a Gyroklystron High-power Microwave Source for Linear Colliders. In this report we document the progress that has been made during the past year for each of the three tasks.
Date: January 1, 1992
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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