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Alternate electrode materials for the SP100 reactor. Final report
This work was performed in response to a request by the Astro-Space Division of the General Electric Co. to develop alternate electrodes materials for the electrodes of the PD2 modules to be used in the SP100 thermoelectric power conversion system. Initially, the project consisted of four tasks: (1) development of a ZrB{sub 2} (C) CVD coating on SiMo substrates, (2) development of a ZrB{sub 2} (C) CVD coating on SiGe substrates, (3) development of CVI W for porous graphite electrodes, and (4) technology transfer of pertinent developed processes. The project evolved initially into developing only ZrB{sub 2} coatings on SiGe and graphite substrates, and later into developing ZrB{sub 2} coatings only on graphite substrates. Several sizes of graphite and pyrolytic carbon-coated graphite substrates were coated with ZrB{sub 2} during the project. For budgetary reasons, the project was terminated after half the allotted time had passed. Apart from the production of coated specimens for evaluation, the major accomplishment of the project was the development of the CVD processing to produce the desired coatings.
Date:
May 1, 1992
Creator:
Randich, E.
Object Type:
Report
System:
The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 92, No. 42, Ed. 1 Friday, May 1, 1992
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
May 1, 1992
Creator:
Lomenick, Rick
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Analysis and computer tools for separation processes involving nonideal mixtures
The objectives of this research, were to continue to further both the theoretical understanding of and the development of computer tools (algorithms) for separation processes involving nonideal mixtures. These objectives were divided into three interrelated major areas -- the mathematical analysis of the number of steady-state solutions to multistage separation processes, the numerical analysis of general, related fixed-point methods, and the development and implementation of computer tools for process simulation.
Date:
May 1, 1992
Creator:
Lucia, A.
Object Type:
Report
System:
The UNT Digital Library
Analysis and computer tools for separation processes involving nonideal mixtures. Progress report, December 1, 1989--November 30, 1992
The objectives of this research, were to continue to further both the theoretical understanding of and the development of computer tools (algorithms) for separation processes involving nonideal mixtures. These objectives were divided into three interrelated major areas -- the mathematical analysis of the number of steady-state solutions to multistage separation processes, the numerical analysis of general, related fixed-point methods, and the development and implementation of computer tools for process simulation.
Date:
May 1, 1992
Creator:
Lucia, A.
Object Type:
Report
System:
The UNT Digital Library
Analysis of a piping system for requalification
This paper discusses the global stress analysis required for the seismic/structural requalification of a reactor secondary piping system in which minor defects (flaws) were discovered during a detailed inspection. The flaws in question consisted of weld imperfections. Specifically, it was necessary to establish that the stresses at the flawed sections did not exceed the allowables and that the fatigue life remained within acceptable limits. At the same time the piping system had to be qualified for higher earthquake loads than those used in the original design. To accomplish these objectives the nominal stress distributions in the piping system under the various loads (dead load, thermal load, wind load and seismic load) were determined. First a best estimate finite element model was developed and calculations were performed using the piping analysis modules of the ANSYS Computer Code. Parameter studies were then performed to assess the effect of physically reasonable variations in material, structural, and boundary condition characteristics. The nominal stresses and forces so determined, provided input for more detailed analyses of the flawed sections. Based on the reevaluation, the piping flaws were judged to be benign, i.e., the piping safety margins were acceptable inspite of the increased seismic demand. 13 refs.
Date:
May 1, 1992
Creator:
Hsieh, B. J. & Tang, Yu
Object Type:
Article
System:
The UNT Digital Library
Analysis of coolability of the control rods of a Savannah River Site production reactor with loss of normal forced convection cooling
An analytical study of the coolability of the control rods in the Savannah River Site (SRS) K-Production Reactor under conditions of loss of normal forced convection cooling has been performed. The study was performed as part of the overall safety analysis of the reactor supporting its restart. The analysis addresses the buoyancy-driven flow over the control rods that occurs when forced cooling is lost, and the limit of critical heat flux that sets the acceptance criteria for the study. The objective of the study is to demonstrate that the control rods will remain cooled at powers representative of those anticipated for restart of the reactor. The study accomplishes this objective with a very tractable simplified analysis for the modest restart power. In addition, a best-estimate calculation is performed, and the results are compared to results from sub-scale scoping experiments. 5 refs.
Date:
May 1, 1992
Creator:
Easterling, T. C.; Hightower, N. T.; Smith, D. C. & Amos, C. N.
Object Type:
Article
System:
The UNT Digital Library
An analysis of multiple particle settling for LMR backup shutdown systems
Backup shutdown systems proposed for future LMRs may employ discreet absorber particles to provide the negative reactivity insertion. When actuated, these systems release a dense packing of particles from an out-of-core region to settle into an in-core region. The multiple particle settling behavior is analyzed by the method of continuity waves. This method provides predictions of the dynamic response of the system including the average particle velocity and volume fraction of particles vs. time. Although hindered settling problems have been previously analyzed using continuity wave theory, this application represents an extension of the theory to conditions of unrestrained settling. Typical cases are analyzed and numerical results are calculated based on a semi-empirical drift-flux model. For 1/4-inch diameter boron-carbide particles in hot liquid sodium, the unrestrained settling problem assumes a steady-state solution when the average volume fraction of particles is 0.295 and the average particle velocity is 26.0 cm/s.
Date:
May 1, 1992
Creator:
Brock, R. W.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Analysis of the potential impacts on surface water quality resulting from the proposed use of the San Luis Drain to transport agricultural drainage through the northern Grasslands
An Environmental Assessment and initial Study for the interim use of a portion of the San Luis Drain for conveyance water through the Grassland Water District and adjacent Grassland areas was conducted. The project proposes the use of 18 miles of the San Luis Drain for the conveyance of agricultural drainage water for a period of five years and the elimination of agricultural drainage discharges from 76 miles of existing channels in and adjacent to the Grassland Water District. A report was prepared to (a) quantify the potential project effects on surface water quality within Salt and Mud Sloughs and the San Joaquin River using currently available data, and (b) to improve the understanding of existing water supply and drainage operations within the Grassland area. After submission of the original report it was brought to the attention of one of the coauthors that the database on selenium and boron concentrations in drainage water did not include the water quality data collected by the Regional Water Quality Control Board (CRWQCB). In addition, the US Bureau of Reclamation (USBR) requested further examination of Grasslands hydrology to estimate the quantity of supplemental water that would be needed to restore the San Joaquin River …
Date:
May 1, 1992
Creator:
Quinn, N. W. T.
Object Type:
Report
System:
The UNT Digital Library
Analysis of the potential impacts on surface water quality resulting from the proposed use of the San Luis Drain to transport agricultural drainage through the northern Grasslands
An Environmental Assessment and initial Study for the interim use of a portion of the San Luis Drain for conveyance water through the Grassland Water District and adjacent Grassland areas was conducted. The project proposes the use of 18 miles of the San Luis Drain for the conveyance of agricultural drainage water for a period of five years and the elimination of agricultural drainage discharges from 76 miles of existing channels in and adjacent to the Grassland Water District. A report was prepared to (a) quantify the potential project effects on surface water quality within Salt and Mud Sloughs and the San Joaquin River using currently available data, and (b) to improve the understanding of existing water supply and drainage operations within the Grassland area. After submission of the original report it was brought to the attention of one of the coauthors that the database on selenium and boron concentrations in drainage water did not include the water quality data collected by the Regional Water Quality Control Board (CRWQCB). In addition, the US Bureau of Reclamation (USBR) requested further examination of Grasslands hydrology to estimate the quantity of supplemental water that would be needed to restore the San Joaquin River …
Date:
May 1, 1992
Creator:
Quinn, N. W. T.
Object Type:
Report
System:
The UNT Digital Library
Annual Site Environmental Report of the Lawrence Berkeley Laboratory, calendar year 1991
This Annual Site Environmental Report (ASER) summarizes LBL environmental activities in calendar year (CY) 1991. The purpose of this Report is to present summary environmental data in order to characterize site environmental management performance, confirm compliance with environmental standards and requirements, and highlight significant programs and efforts.
Date:
May 1, 1992
Creator:
Pauer, R. O.; Schleimer, G. E. & Javendel, I.
Object Type:
Report
System:
The UNT Digital Library
Annual Site Environmental Report of the Lawrence Berkeley Laboratory, calendar year 1991
This Annual Site Environmental Report (ASER) summarizes LBL environmental activities in calendar year (CY) 1991. The purpose of this Report is to present summary environmental data in order to characterize site environmental management performance, confirm compliance with environmental standards and requirements, and highlight significant programs and efforts.
Date:
May 1, 1992
Creator:
Pauer, R. O.; Schleimer, G. E. & Javendel, I. (eds.)
Object Type:
Report
System:
The UNT Digital Library
Antiproton driven microfission-fusion on closer inspection
A closer look at the energetics of antiproton annihilation in real systems, coupled to hydrodynamics, materials strength, particle transport, equations of state, and related interactions is necessary to assess ultimate viability. The systematics of antiproton microfission-fusion are the subject of this analysis, as well as technology constraints.
Date:
May 1, 1992
Creator:
Wienke, B. R.
Object Type:
Article
System:
The UNT Digital Library
Aortic Baroreceptor Reflex Control of Blood Pressure: Effect of Fitness
Aortic baroreflex (ABR) control of blood pressure was examined in 7 untrained (UT) and 8 endurance exercise trained (EET) young men. ABR control of blood pressure was determined during a steady state phenylephrine infusion to increase mean arterial pressure 10-15 mmHg, combined with positive neck pressure to counteract the increased carotid sinus transmural pressure, and low levels of lower body negative pressure to counteract the increased central venous pressure. Functioning alone, the ABR was functionally adequate to control blood pressure. However, ABR control of HR was significantly diminished in the EET subjects due solely to the decrease in the ABR sensitivity. The persistent strain from an increased stroke volume resulting from endurance exercise training could be the responsible mechanism.
Date:
May 1992
Creator:
Andresen, Jean M.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Aperture coupling measurement in a test chamber for the Advanced Photon Source (APS)
Aperture coupling measurements have been made using two identical rectangular chambers. A common wall between them has holes of various size, thickness, shape and number. The transverse electromagnetic (TEM) wave, which propagates in one rectangular chamber, couples through the aperture and radiates into the other chamber. The measured results are compared with the diffraction model and used to estimate the coupling impedance of a circulating beam. The results of these measurements was applied to the detailed design of some of the vacuum components in the Advanced Photon Source.
Date:
May 1, 1992
Creator:
Song, J. J.; Zhou, J. H. & Kustom, R. L.
Object Type:
Article
System:
The UNT Digital Library
Application of ground-penetrating radar at McMurdo Station, Antarctica
Argonne National Laboratory initiated a site investigation program at McMurdo Station, Antarctica, to characterize environmental contamination. The performance and usefulness of ground-penetrating radar (GPR) was evaluated under antarctic conditions during the initial site investigation in January 1991. Preliminary surveys were successful in defining the contact between reworked pyroclastic material and in the prefill, undisturbed pyroclastics and basalts at some sites. Interference from radio traffic at McMurdo Station was not observed, but interference was a problem in work with unshielded antennas near buildings. In general, the results of this field test suggest that high-quality, high-resolution, continuous subsurface profiles can be produced with GPR over most of McMurdo Station.
Date:
May 1, 1992
Creator:
Stefano, J. E.
Object Type:
Article
System:
The UNT Digital Library
Application of the proposed new ICRP lung model to bioassay
The new lung model being proposed by ICRP for use in radiation protection dosimetry requires the calculation of doses to separate regions of the respiratory tract, multiplying these doses by factors proportional to the risk per unit dose to each region, and summing over all regions of the lung to give a ``weighted`` lung dose. This paper compares the doses that would be calculated form bioassay measurements using the new model with those calculated using the current model, which essentially uses total lung burden to estimate lung dose.
Date:
May 1, 1992
Creator:
Johnson, J. R.; James, A. C. & Hill, R. L.
Object Type:
Article
System:
The UNT Digital Library
Application of the proposed new ICRP lung model to bioassay
The new lung model being proposed by ICRP for use in radiation protection dosimetry requires the calculation of doses to separate regions of the respiratory tract, multiplying these doses by factors proportional to the risk per unit dose to each region, and summing over all regions of the lung to give a weighted'' lung dose. This paper compares the doses that would be calculated form bioassay measurements using the new model with those calculated using the current model, which essentially uses total lung burden to estimate lung dose.
Date:
May 1, 1992
Creator:
Johnson, J. R.; James, A. C. & Hill, R. L.
Object Type:
Article
System:
The UNT Digital Library
Argonne National Laboratory-East Site Environmental Report for Calendar Year 1991
This report discusses the results of the environmental protection program at Argonne National Laboratory-East (ANL) for 1991. To evaluate the effects of ANL operations on the environment, samples of environmental media collected on the site, at the site boundary, and off the ANL site were analyzed and compared to applicable guidelines and standards. A variety of radionuclides was measured in air, surface water, groundwater, soil, grass, and bottom sediment samples.
Date:
May 1992
Creator:
Golchert, N. W.; Duffy, T. L. & Moos, L. P.
Object Type:
Report
System:
The UNT Digital Library
Argonne National Laboratory-East site environmental report for calendar year 1991
This report discusses the results of the environmental protection program at Argonne National Laboratory-East (ANL) for 1991. To evaluate the effects of ANL operations on the environment, samples of environmental media collected on the site, at the site boundary, and off the ANL site were analyzed and compared to applicable guidelines and standards. A variety of radionuclides was measured in air, surface water, groundwater, soil, grass, and bottom sediment samples. Chemical constituents in surface water, groundwater, and ANL effluent water were analyzed. External penetrating radiation doses were measured and the potential for radiation exposure to off-site population groups was estimated. Results are interpreted in terms of the origin of the radioactive and chemical substances (natural, fallout, ANL, and other) and are compared with applicable environmental quality standards. A US Department of Energy (DOE) dose calculation methodology, based on International Commission on Radiological Protection (ICRP) recommendations and the CAP-88 version of the EPA-AIRDOSE/RADRISK computer code, is used in this report. The status of ANL environmental protection activities with respect to the various laws and regulations which govern waste handling and disposal is discussed. This report also discusses progress being made on environmental corrective actions and restoration projects from past activities.
Date:
May 1, 1992
Creator:
Golchert, N. W.; Duffy, T. L. & Moos, L. P.
Object Type:
Report
System:
The UNT Digital Library
Assessment of dome-fill technology and potential fill materials for the Hanford single-shell tanks
This study is part of a task that will identify dome-fill materials to stabilize and prevent the collapse of the structures of 149 single- shell tanks (SSTs). The SSTs were built at the Hanford Site in Washington State and used between 1944 and 1980 to store radioactive and other hazardous wastes. In addition to identifying suitable fill materials, this task will develop the technology and methods required to fill the tanks with the selected material. To date, basalt is the only candidate fill material with any testing conducted for its suitability as a dome-fill material. Sufficient data do not exist to select or eliminate basalt as a candidate material. This report documents a review of past dome-fill work at the Hanford Site and of other pertinent literature to establish a baseline for the dome-fill technology. In addition, the report identifies existing dome-fill technology, preliminary performance criteria for dome-fill technology development, potential testing strategies, and potential fill materials. As a part of this study, potential fill materials are qualitatively evaluated and a list of preliminary candidate fill materials is identified. Future work will further screen these materials. The dome-fill task work will ultimately contribute to the development of a final waste …
Date:
May 1, 1992
Creator:
Smyth, J.D.; Shade, J.W. & Somasundaram, S.
Object Type:
Report
System:
The UNT Digital Library
Assessment of dome-fill technology and potential fill materials for the Hanford single-shell tanks
This study is part of a task that will identify dome-fill materials to stabilize and prevent the collapse of the structures of 149 single- shell tanks (SSTs). The SSTs were built at the Hanford Site in Washington State and used between 1944 and 1980 to store radioactive and other hazardous wastes. In addition to identifying suitable fill materials, this task will develop the technology and methods required to fill the tanks with the selected material. To date, basalt is the only candidate fill material with any testing conducted for its suitability as a dome-fill material. Sufficient data do not exist to select or eliminate basalt as a candidate material. This report documents a review of past dome-fill work at the Hanford Site and of other pertinent literature to establish a baseline for the dome-fill technology. In addition, the report identifies existing dome-fill technology, preliminary performance criteria for dome-fill technology development, potential testing strategies, and potential fill materials. As a part of this study, potential fill materials are qualitatively evaluated and a list of preliminary candidate fill materials is identified. Future work will further screen these materials. The dome-fill task work will ultimately contribute to the development of a final waste …
Date:
May 1, 1992
Creator:
Smyth, J. D.; Shade, J. W. & Somasundaram, S.
Object Type:
Report
System:
The UNT Digital Library
Assessment of the need for dual indoor/outdoor warning systems and enhanced tone alert technologies in the Chemical Stockpile Emergency Preparedness Program
The need for a dual indoor/outdoor warning system as recommended by the program guidance and Alert and Notification (A N) standard for the Chemical Stockpile Emergency Preparedness Program is analyzed in this report. Under the current program standards, the outdoor warning system consists of omnidirectional sirens and the new indoor system would be an enhanced tone alert (TA) radio system. This analysis identifies various tone-alert technologies, distribution options, and alternative siren configurations. It also assesses the costs and benefits of the options and analyzes what appears to best meet program needs. Given the current evidence, it is recommended that a 10-dB siren system and the special or enhanced TA radio be distributed to each residence and special institution in the immediate response zone as preferred the A N standard. This approach minimizes the cost of maintenance and cost of the TA radio system while providing a high degree of reliability for indoor alerting. Furthermore, it reaches the population (residential and institutional) in the greatest need of indoor alerting.
Date:
May 1, 1992
Creator:
Sorensen, J.H.
Object Type:
Report
System:
The UNT Digital Library
Assessment of the need for dual indoor/outdoor warning systems and enhanced tone alert technologies in the Chemical Stockpile Emergency Preparedness Program
The need for a dual indoor/outdoor warning system as recommended by the program guidance and Alert and Notification (A&N) standard for the Chemical Stockpile Emergency Preparedness Program is analyzed in this report. Under the current program standards, the outdoor warning system consists of omnidirectional sirens and the new indoor system would be an enhanced tone alert (TA) radio system. This analysis identifies various tone-alert technologies, distribution options, and alternative siren configurations. It also assesses the costs and benefits of the options and analyzes what appears to best meet program needs. Given the current evidence, it is recommended that a 10-dB siren system and the special or enhanced TA radio be distributed to each residence and special institution in the immediate response zone as preferred the A&N standard. This approach minimizes the cost of maintenance and cost of the TA radio system while providing a high degree of reliability for indoor alerting. Furthermore, it reaches the population (residential and institutional) in the greatest need of indoor alerting.
Date:
May 1, 1992
Creator:
Sorensen, J. H.
Object Type:
Report
System:
The UNT Digital Library
The Association between Attitudes toward Computers and Understanding of Ethical Issues Affecting Their Use
This study examines the association between the attitudes of students toward computers and their knowledge of the ethical uses of computers. The focus for this research was undergraduate students in the Colleges of Arts and Sciences (Department of Computer Science), Business and Education at the University of North Texas in Denton, Texas.
Date:
May 1992
Creator:
Gottleber, Timothy Theodore
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library