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Velocity and Attenuation Structure of the Geysers Geothermal Field, California

Description: The Geysers geothermal field is located in northern California and is one of the world's largest producers of electricity from geothermal energy. The resource consists of primarily dry steam which is produced from a low, porosity fractured graywacke. Over the last several years steam pressure at the Geysers has been dropping. Concern over decline of the resource has prompted research to understand its fundamental nature. A key issue is the distribution of fluid in the matrix of the reservoir ro… more
Date: January 1, 1993
Creator: Zucca, J. J.; Hutchings, L. J. & Kasameyer, P. W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Impacts of a Sub-Slab Aggregate Layer and a Sub-Aggregate Membrane on Radon Entry Rate: A Numerical Study

Description: A subslab aggregate layer can increase the radon entry rate into a building by up to a factor of 5. We use a previously tested numerical technique to investigate and confirm this phenomenon. Then we demonstrate that a sub-aggregate membrane has the potential to significantly reduce the increase in radon entry rate due to the aggregate layer, even when a gap exists between the perimeter of the membrane and the footer. Such membranes greatly reduce diffusion of radon from the soil into the aggreg… more
Date: January 1, 1993
Creator: Bonnefous, Y. C.; Gadgil, A. J.; Revzan, K. L.; Fisk, W. J. & Riley, W. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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The Distribution of Exposure to Radon: Effects of Population Mobility

Description: The distribution of population exposures to radon, rather than the distribution of indoor radon concentrations, determines the fraction of population exposed to exceptionally high risk from radon exposures. Since this fraction at high risk has prompted the development of public policies on radon, it is important to first determine the magnitude of this fraction, and then how it much would decrease with different implementation program options for radon mitigation. This papers presents an approa… more
Date: January 1, 1993
Creator: Gadgil, A. J.; Rein, S.; Nero, A. V. & Wollenberg Jr., H. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Shielding and Criticality Analyses of Phase I Reference Truck and Rail Cask Designs for Spent Nuclear Fuel

Description: This work was performed in support of the planned Phase I request for proposals (RFP) for spent nuclear fuel (SNF) transportation cask designs. The funding for this work was provided by the Office of Civilian Radioactive Waste Management (OCRWM) through its M&O contractor, TRW Environmental Safety Systems (TESS). The objective of this work was to prepare for the criticality and shielding evaluation of the Phase I cask design proposals by investigating the effect of SNF and design variables … more
Date: January 1, 1993
Creator: Broadhead, B.L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
captions transcript

[News Clip: Cowboys songs]

Description: B-roll video footage from the KXAS-TV/NBC station in Fort Worth, Texas, covering a news story about artists creating songs to cheer on the Dallas Cowboys. The footage features one artist recording a song, a video for a song called "To Da Bowl Ya'll" with game footage and a live performance of the song by Russ Parr on the West End stage in downtown Dallas.
Date: January 1, 1993
Duration: 1 minute 34 seconds
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Item Type: Refine your search to only Video
Partner: UNT Libraries Special Collections
open access

A beamline design and data acquisition with the 20-MeV, 20-ps electron beam for the higher-order mode studies of the APS SR-rf cavities

Description: A beamline has been designed and assembled to use the ANL Chemistry Division 20-MeV electron linac for the testing of higher-order mode excitation and damping in rf cavities. The beamline consists of two sections (a beam collimating section with a 1.5 inches-OD vacuum line, and a cavity test section with a 3 inches-OD vacuum line), separated by two double aluminum foil windows. The beam diagnostics consist of a stripline beam position monitor, integrating current transformers, fluorescent scree… more
Date: January 1, 1993
Creator: Song, J.; Nassiri, A. & Daly, R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

High precision beam alignment of electromagnetic wigglers

Description: The performance of Free-Electron Lasers depends critically on the quality of the alignment of the electron beam to the wiggler's magnetic axis and the deviation of this axis from a straight fine. The measurement of the electron beam position requires numerous beam position monitors in the wiggler, where space is at premium. The beam position measurement is used to set beam steerers for an orbit correction in the wiggler. The authors propose an alternative high precision alignment method in whic… more
Date: January 1, 1993
Creator: Ben-Zvi, Ilan & Qiu, X. Z.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Diffuse scattering and image contrast of tweed in superconducting oxides: A simulation and interpretation

Description: Monte Carlo simulations were performed with a lattice gas model which represents the interactions between oxygen atoms in YBa[sub 2](Cu[sub 1-x]M[sub x])[sub 3]O[sub 7+[delta]] (M=Fe, Co, or Al, 0.03< [times] <0.l) system. The amplitudes of concentration waves/displacement waves obtained from these simulations then were used to calculate the intensity of the diffuse scattering of tweed seen in the electron diffraction pattern. The characteristic features of the tweed image were produced by calc… more
Date: January 1, 1993
Creator: Zhu, Yimei & Cai, Zhi-Xiong.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Operator overloading as an enabling technology for automatic differentiation

Description: We present an example of the science that is enabled by object-oriented programming techniques. Scientific computation often needs derivatives for solving nonlinear systems such as those arising in many PDE algorithms, optimization, parameter identification, stiff ordinary differential equations, or sensitivity analysis. Automatic differentiation computes derivatives accurately and efficiently by applying the chain rule to each arithmetic operation or elementary function. Operator overloading e… more
Date: January 1, 1993
Creator: Corliss, G.F. (Marquette Univ., Milwaukee, WI (United States) Argonne National Lab., IL (United States)) & Griewank, A. (Argonne National Lab., IL (United States))
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Monthly research and development topical report, March--April 1993

Description: This report covers progress made by Gilbert/Commonwealth at the Pittsburgh Energy Technology Center of the U. S. Department of Energy in the provision of research and development support services under Task Orders 30.00 and 32.00 to contract No. DE-AC22-89PC88400 as well as Subtask 3.04, safety activities provided under that contract, and Subtask 7.01, Coal Conversion/Bench Scale Design. The report period runs from March 1 to April 30, 1993.The objective of the R D Support Services and Ancillar… more
Date: January 1, 1993
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

An improved, explosively actuated closing switch for pulsed power applications

Description: An improved, explosively actuated closing switch has been developed for the Pegasus II capacitor bank. The new switch design uses an annular metal jet as the switch contact. It has lower resistance and inductance at early time than the original design. A parallel array of 24 switches on Pegasus II has a resistance of less than 10 [mu][Omega] after 300 ns. Measured time behaviors include an intrinsic jitter of 50 ns and a switching delay that depends inversely on the applied voltage.
Date: January 1, 1993
Creator: Parker, J. V.; Bartsch, R. R.; Cochrane, J. C. & Marsh, S. P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

ISO standards on the evaluation of contamination

Description: The International Organization for Standardization (ISO) develops radiation calibration standards through Subcommittee 2 (titled Radiation Protection'') of Technical Committee 85 (ISO/TC85/SC2). The subcommittee has also developed standards providing guidance on the performance of measurements. ISO/TC85/SC2 consists of international technical experts who represent their countries through the international consensus process in providing guidance in several radiation protection areas. The purpose… more
Date: January 1, 1993
Creator: Swinth, K.L. (Pacific Northwest Lab., Richland, WA (United States)) & Tamberg, T.A. (Bundesanstalt fuer Materialforschung und -pruefung, Berlin (Germany))
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Failure and factors of safety in piping system design

Description: An important body of test and performance data on the behavior of piping systems has led to an ongoing reassessment of the code stress allowables and their safety margin. The codes stress allowables, and their factors of safety, are developed from limits on the incipient yield (for ductile materials), or incipient rupture (for brittle materials), of a test specimen loaded in simple tension. In this paper, we examine the failure theories introduced in the B31 and ASME III codes for piping and th… more
Date: January 1, 1993
Creator: Antaki, G. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

A risk-based approach to cost-benefit analysis of software safety activities

Description: Assumptions about the economics of making a system safe are usually not explicitly stated in industrial and software models of safety-critical systems. These assumptions span a wide spectrum of economic tradeoffs with respect to resources expended to make a system safe. The missing component in these models that is necessary for capturing the effect of economic tradeoffs is risk. A qualitative risk-based software safety model is proposed that combines features of industrial and software systems… more
Date: January 1, 1993
Creator: Fortier, S.C. (Intermetrics, Inc., McLean, VA (United States)) & Michael, J.B. (Argonne National Lab., IL (United States))
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Fin-efficiency calculation for condensation in the presence of noncondensable gases

Description: Plate-fin heat exchangers are being considered for many condenser applications. They are commonly used for the gas-separation process because they can provide a high thermal performance to obtain a low mean-temperature difference, essential for the gas-separation process. Plate-fin heat exchangers are also considered for the heat-pump system using nonazeotropic refrigerant mixtures. The brazed plate-fin condenser was considered to be a leading candidate for the Ocean Thermal Energy Conversion (… more
Date: January 1, 1993
Creator: Panchal, C.B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Design of large aperture, low mass vacuum windows

Description: Large vacuum vessels are employed downstream of fixed targets in High Energy Physics experiments to provide a long path for particles to traverse without interacting with air molecules. These vessels generally have a large aperture opening known as a vacuum window which employs a thin membrane to preserve the vacuum environment yet allows the particles to pass through with a minimal effect on them. Several large windows have been built using a composite of Kevlar/Mylar including circular window… more
Date: January 1, 1993
Creator: Leonhardt, W.J. & Mapes, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Market and Energy Demand Analysis of a US Maglev System

Description: High-speed magnetically levitated (maglev) vehicles can provide an alternative mode of transportation for intercity travel, particularly for short- and medium-distance trips between 100 to 600 mi (160 and 960 km). The patterns of growth and the underlying factors affecting that growth In the year 2010 are evaluated to determine the magnitude of US Intercity travel that would become the basis for maglev demand. A methodology that is sensitive to the travelers' socioeconomic attributes was develo… more
Date: January 1, 1993
Creator: Vyas, A. D. & Rote, D. M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Control and Performance of the AGS and AGS Booster Main Magnet Power Supplies

Description: Techniques for precision control of the main magnet power supplies for the AGS and AGS Booster synchrotron will be discussed. Both synchrotrons are designed to operate in a Pulse-to-Pulse Modulation (PPM) environment with a Supercycle Generator defining and distributing global timing events for the AGS Facility. Details of modelling, real-time feedback and feedforward systems, generation and distribution of real time field data, operational parameters and an overview of performance for both mac… more
Date: January 1, 1993
Creator: Reece, R. K.; Casella, R.; Culwick, B.; Geller, J.; Marneris, I.; Sandberg, J. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Lectures of Fermi liquid theory

Description: The Fermi liquid theory was first introduced by Landau in 1956 to provide a theoretical basis for the properties of strongly correlated Fermi systems. This theory has proven to be crucial for our understanding of a broad range of materials. These include liquid [sup 3]He, [sup 3]He-[sup 4]He mixtures, simple metals, heavy-fermions, and nuclear matter to name a few. In the high temperature superconductors questions have been raised regarding the applicability of Fermi liquid theory to the normal… more
Date: January 1, 1993
Creator: Bedell, K.S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Structural response of reactor-core hexcan subassemblies subjected to dynamic overpressurization under accident conditions

Description: This paper presents a two-dimensional structural analysis for the evaluation of a single core subassembly due to internal overpressure associated with possible failure of fuel pins having high fission gas plenum pressure. Structural models are developed for the subassemblies and their surroundings with emphasis on the critical physical aspects of the problem. With these models the strains, deformations and the extent of permanent damage (plastic strain) to the subassemblies can be assessed. The… more
Date: January 1, 1993
Creator: Pfeiffer, P.A. & Kulak, R.F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Chaotic vibration in fluidelastic instability of a tube row in crossflow

Description: Chaotic motions with complicated orbits make the prediction of wear between heat exchanger tubes and tube support plates difficult. To unravel the chaotic motions of nonlinearly supported tubes caused by the fluidelastic instability, an analytical investigation based on unsteady flow theory was conducted. The analytical model consists of a row of rigid tubes with three flexible tubes supported by elastic springs. This simplified model enables the study of the fluidelastic coupling effects of lo… more
Date: January 1, 1993
Creator: Chen, S.H. & Chen, S.S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Femtosecond growth dynamics of an underdense ionization front measured by spectral blueshifting

Description: A comprehensive report of time-resolved spectral blue shifts of 100-femtosecond laser pulses caused by ionization of atmospheric density N[sub 2] and noble gases subjected to high (10[sup 14] W/cm[sup 2] - 10[sup 16] W/cm[sup 2]) light intensities is presented. Included are data for two experiments: (1) self-shifting of the ionizing laser pulses for varying peak intensities, pressures (1-5 atm.), and gas species; and (2) time-resolved blueshifts of a weak copropagating probe pulse for the same … more
Date: January 1, 1993
Creator: Wood, W. M.; Siders, C. W. & Downer, M. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Migrating criticality safety calculations from mainframe computing at Savannah River

Description: The Savannah River calculational environment is beginning migration away from IBM 3090/3081 and CRAY mainframe computing. Preliminary code migrations to workstations and personal computers have been made but such use has been limited to unofficial scoping'' calculations. Lessons learned suggest migration, while a boon to the end-user, presents a variety of quality assurance issues. These are more pronounced than in mainframe environments and suggest a need to rethink the code custodian's role.
Date: January 1, 1993
Creator: Mincey, J.F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Measuring parity violation using the neutron capture reaction

Description: Measuring parity violation using the total capture reaction has certain advantages over neutron transmission experiments. Very much less material is required for targets, a necessity when dealing with separated isotopes. The capture reaction is also quite sensitive to very weak resonances. These advantages indicated the need to construct a near 4[pi] gamma ray detector for use at LANSCE. A design for such a detector has been completed. Issues influencing the design and the final design paramete… more
Date: January 1, 1993
Creator: Frankle, C. M.; Bowman, J. D.; Seestrom, S. J. (Los Alamos National Lab., NM (United States)); Roberson, N. R. (Duke Univ., Durham, NC (United States) Triangle Universities Nuclear Lab., Durham, NC (United States)) & Sharapov, E. I. (Joint Inst. for Nuclear Research, Dubna (Russian Federation))
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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