UNT Libraries Government Documents Department - 433,330 Matching Results

Search Results

prev Results: 70781 - 70804 next
open access

Feedback components of a U20Pu10Zr-fueled compared to a U10Zr-fueled EBR-II

Description: Calculated feedback components of the regional contributions of the power reactivity decrements (PRDs) and of the temperature coefficients of reactivity of a U20Pu10Zr-fueled and of a U10Zr-fueled Experimental Breeder Reactor II (EBR-II) are compared. The PRD components are also separated into power-to-flow dependent and solely power dependent parts. The effects of these values upon quantities useful for indicating the comparative potential inherent safety characteristics of these EBR-II loadin… more
Date: January 1, 1988
Creator: Meneghetti, D. & Kucera, D.A.
Item Type: Refine your search to only Article
open access

High temperature aqueous potassium and sodium phosphate solutions: two-liquid-phase boundaries and critical phenomena, 275-400/sup 0/C; potential applications for steam generators

Description: Two-liquid-phase boundaries at temperatures between 275 and 400/sup 0/C were determined for potassium phosphate and sodium phosphate aqueous solutions for compositions from 0 to 60 wt % dissolved salt. The stoichiometric mole ratios, K/PO/sub 4/ or Na/PO/sub 4/, were varied from 1.00 to 2.12 and from 1.00 to 2.16 for the potassium and sodium systems, respectively. Liquid-vapor critical temperatures were also determined for most of the dilute liquid phases that formed. The minimum temperatures (… more
Date: December 1, 1981
Creator: Marshall, W.L.
Item Type: Refine your search to only Report
open access

India: Asia-Pacific energy series country report

Description: As part of our continuing assessment of Asia-Pacific energy markets, the Resources Programs of the East-West Center series of country studies that discuss in detail the structure of the energy sector. To date, our reports to the US Department of Energy, Assistant Secretary for International Affairs and Energy Emergencies, have covered Australia, China, India, Indonesia, Japan, Malaysia, New Zealand, Pakistan, the Philippines, Singapore, South Korea, Taiwan, and Thailand. The country studies pro… more
Date: March 1, 1992
Creator: Gazdar, M.N.
Item Type: Refine your search to only Report
open access

An update on standards for radiation in the environment and associated estimates of risk

Description: This presentation reviews current and proposed standards, recommendations, and guidances for limiting routine radiation exposures of the public, and estimates the risk corresponding to standards, recommendations, and guidances. These estimates provide a common basis for comparing different criteria for limiting public exposures to radiation, as well as hazardous chemicals.
Date: June 21, 1989
Creator: Kocher, David C.
Item Type: Refine your search to only Article
open access

Review of the stack discharge active particle contamination problem

Description: Quantities of the order of ten million to 100 million radioactive particles per month were emitted from the stacks over a period of several months. High activity in the range 0.1 to 3..mu..c was probably confined to large carrier particles of corrosion debris from iron ductwork in the separations plant ventilation air system. This report discusses chemical, physical and radiochemical properties of the particles, and possible biological and health effects of exposure to them. (ACR)
Date: March 22, 1948
Creator: Parker, H M
Item Type: Refine your search to only Report
open access

Microstructural characterization of rare earth-cobalt magnets

Description: Structural faults and phase transformations in R/sub 2/-Co/sub 17/ magnets are studied using transmission electron microscopy. The magnetization mechanism in a step aged Sm (Co, Fe, Cu, Zr) alloy is determined to be by domain wall pinning in the 1:5 phase of the cellular microstructure. Limitations of the electron metallography technique to study these materials are pointed out.
Date: October 1, 1979
Creator: Mishra, R.K. & Thomas, G.
Item Type: Refine your search to only Article
open access

Analysis of a coal brokerage for a midwest site. [Green Bay and Kewaunee, Wisconsin]

Description: Coal demand of an area aggregated and served through a single facility in order to achieve the high volumes necessary to justify unit-train service is deemed a coal brokerage. Once such a system is initiated, it is conjectured that coal users too small to individually receive unit-train orders can begin to capture the cost savings associated with large volume shipments. In order to examine the coal-brokerage concept closely, the Green Bay-Kewaunee, Wisconsin region was chosen as the site for an… more
Date: October 1, 1979
Creator: Knorr, R. & Wilkie, K.
Item Type: Refine your search to only Report
open access

A low jitter, low cost, time-of-flight circuit

Description: A low cost circuit has been developed for use in a neutron time-of-flight spectrometer at the Nova Laser Facility. Using a silicon charged-particle detector, amplifier and constant-fraction discriminator, timing resolution of better than 50 ps FWHM has been achieved. Using an array of many such detectors, very high data rates and precise spectra can be obtained. 3 refs., 2 figs.
Date: October 1, 1987
Creator: Cable, M.D.; Derzon, M.S.; Vieira, R.G. & Spracklen, H.P.
Item Type: Refine your search to only Article
open access

Performance of an active/passive hybrid solar system utilizing vapor transport

Description: Vapor-phase heat-transport systems are being tested in two of the passive test cells at Los Alamos. The systems consist of an active fin-and-tube collector and a condenser inside a water storage tank. The refrigerant, R-11, can be returned to the collector with a pump or with a self-pumping scheme. A computer model was developed to predict the behavior of the system, after which the computer was used to predict the annual performance of these systems in five cities. The report compares the meas… more
Date: January 1, 1984
Creator: Hedstrom, J.C.
Item Type: Refine your search to only Report
open access

Evaluation of the Solar Building, Albuquerque, New Mexico: instrumentation of building and system

Description: The instrumentation used to obtain data on the Solar Building, Albuquerque, New Mexico during the period November, 1974, through April, 1976 is described. Attention is focused on the types of instrumentation used: their principles of operation, sensitivity, range and where pertinent, installation. Locations of sensors are identified, so far as this pertains to obtaining accurate and adequate data. A list of sensors monitored in the third period is presented, as an example in appendix A. For con… more
Date: July 1, 1976
Creator: Wildin, M.W.; McLaughlin, E.R. & Gilman, S.F.
Item Type: Refine your search to only Report
open access

Topics in theoretical surface science

Description: The energetics and structures of clean and adsorbate covered surfaces are investigated in this dissertation. First, the formalism, within the Corrected Effective Medium (CEM) method, for calculating the surface energy of a clean surface is derived. The surface energies for many different metals and their low index surfaces are presented. The minimization of the surface energy is then used to predict the multilayer relaxation of the Al(111), (100), Ni(100), (110) and Fe(100) surfaces. Extensions… more
Date: October 25, 1991
Creator: Todd, R.
Item Type: Refine your search to only Report
open access

Low plasma edge temperatures for the self-pumped limiter

Description: Transport code calculations have been performed to study the operation of an INTOR-like tokamak plasma from which helium is removed by a self-pumped limiter, which traps helium, but not hydrogen, in its surface layers. To prevent saturation by helium, the surface is renewed by continuous injection of the surface material (vanadium in this study) into the scrape-off layer. The presence of the injected vanadium leads to plasma temperatures well below 50 eV in the scrape-off layer, with supplement… more
Date: March 1, 1985
Creator: Terry, W. K. & Brooks, J. N.
Item Type: Refine your search to only Report
open access

Influence of crack depth on the fracture toughness of reactor pressure vessel steel

Description: The Heavy Section Steel Technology Program (HSST) at Oak Ridge National Laboratory (ORNL) is investigating the influence of flaw depth on the fracture toughness of reactor pressure vessel (RPV) steel. Recently, it has been shown that, in notched beam testing, shallow cracks tend to exhibit an elevated toughness as a result of a loss of constraint at the crack tip. The loss of constraint takes place when interaction occurs between the elastic-plastic crack-tip stress field and the specimen surfa… more
Date: January 1, 1991
Creator: Theiss, T.J. & Bryson, J.W.
Item Type: Refine your search to only Article
open access

Communication strategy to commercialize passive solar energy

Description: Although certain technical and economic issues remain to be clarified, passive solar market development is increasingly dependent upon communications such as information dissemination, education, training and promotional activities. Target audiences are identified as both recipients and disseminators of passive solar communications. Form and quality of information are discussed in terms of the stages of an innovation adoption decision-making process. Several communication-related barriers which… more
Date: January 1, 1979
Creator: Wolcott, D. R. & Shoemaker, F. F.
Item Type: Refine your search to only Article
open access

Implications for supersymmetry of the CERN monojets

Description: Results of a comprehensive study of supersymmetric processes which could give monojet events similar to those observed at the CERN Sp anti pS are presented. If supersymmetry is to be the explanation of the monojets, strict bounds are obtained on possible supersymmetric masses. 15 references.
Date: January 1, 1985
Creator: Haber, H.E.
Item Type: Refine your search to only Article
open access

Survey of flash x-ray techniques and applications

Description: Flash x-ray diagnostics of high-speed dynamic tests need to be reliable as the test may be quite expensive and time-consuming. Preparation for a first-time test can involve many partial or preliminary tests to verify adequacy of x-ray energy, x-ray exposure, film/screen combination, film-holder protection, flash x-ray-generator protection, triggering, and timing techniques. Once these preparations have been successfully completed, very informative results are attainable for a variety of tests i… more
Date: January 1, 1983
Creator: Bryant, L.E. Jr. & Lucero, J.P.
Item Type: Refine your search to only Article
open access

Human Factors Review Plan

Description: ''Human Factors'' is concerned with the incorporation of human user considerations into a system in order to maximize human reliability and reduce errors. This Review Plan is intended to assist in the assessment of human factors conditions in existing DOE facilities. In addition to specifying assessment methodologies, the plan describes techniques for improving conditions which are found to not adequately support reliable human performance. The following topics are addressed: (1) selection of a… more
Date: December 1, 1985
Creator: Paramore, B. & Peterson, L.R. (eds.)
Item Type: Refine your search to only Report
open access

High-energy air shock study in steel and grout pipes

Description: Voitenko compressors are used to generate 43 mm/..mu..s air shocks in both a steel and a grout outlet pipe containing ambient atmospheric air. Fiber-optic ports provide diaphragm burst times, time-of-arrival (TOA) data, and velocities for the shock front along the 20-mm-ID exit pipes. Pressure profiles are obtained at higher enthalpy shock propagation than ever before and at many locations along the exit pipes. Numerous other electronic sensors and postshot observations are described, as well a… more
Date: October 5, 1979
Creator: Glenn, H. D.; Kratz, H. R.; Keough, D. D.; Duganne, D. A.; Ruffner, D. J.; Swift, R. P. et al.
Item Type: Refine your search to only Report
open access

Active measurements of defect processes in shock compressed metals and other solids

Description: Solid samples have been routinely recovered for examination after having been subjected to high pressure shock loading. Such investigations have revealed many unique and interesting defect features and are essential if a detailed understanding of shock deformation processes is to be achieved. Nevertheless, examination of samples hours or days after they are compressed for only a few microseconds in a loading whose rise time may be subnanosecond fails to address the relationship between the resi… more
Date: January 1, 1980
Creator: Graham, R. A.
Item Type: Refine your search to only Article
open access

Roles of repetitive sequences

Description: The DNA of higher eukaryotes contains many repetitive sequences. The study of repetitive sequences is important, not only because many have important biological function, but also because they provide information on genome organization, evolution and dynamics. In this paper, I will first discuss some generic effects that repetitive sequences will have upon genome dynamics and evolution. In particular, it will be shown that repetitive sequences foster recombination among, and turnover of, the el… more
Date: January 1, 1991
Creator: Bell, G.I.
Item Type: Refine your search to only Article
open access

Radiation chemistry of synthetic waste

Description: The yield of H{sub 2} from radiolysis of aqueous solutions is substantially reduced by the presence of nitrate and nitrite in the waste solutions. Nitrate is more efficient in scavenging the precursors to H{sub 2} than is nitrite, therefore, the latter should be maintained at higher levels if minimization of radiolytic gas production is required. Nitrate is the major scavenger for e{sub aq}{sup {minus}} and nitrite is the major scavenger for H atoms. At the concentration levels of the waste sol… more
Date: November 1, 1991
Creator: Meisel, D.; Diamond, H.; Horwitz, E. P.; Jonah, C. D.; Matheson, M. S.; Sauer, M. C. Jr. et al.
Item Type: Refine your search to only Report
open access

Program review: resource evaluation, reservoir confirmation, and exploration technology

Description: The details of the program review are reported. A summary of the recommendations, means for their implementation, and a six year program of expenditures which would accomplish the objectives of the recommendations are presented. Included in appendices are the following: DOE/DGE consortia participants; program managers contacted for opinion; communications received from program managers; participants, program review panel; and program strategy for resource evaluation and reservoir confirmation. … more
Date: May 1, 1978
Creator: Ward, S.H.
Item Type: Refine your search to only Report
open access

Enzymatic desulfurization of coal

Description: Our current efforts to develop clean coal technology emphasize the advantages of enzymatic desulfurization techniques and have specifically addressed the potential of using partially-purified extracellular microbial enzymes as well as commercially available enzymes. Our work is focused on the treatment of model'' organic sulfur compounds such as dibenzothiophene (DBT) and ethylphenylsulfide (EPS). Furthermore, we are designing experiments to facilitate the enzymatic process by means of a hydrat… more
Date: June 16, 1989
Creator: Boyer, Y.N.; Crooker, S.C.; Kitchell, J.P.; Nochur, S.V. (Holometrix, Inc., Cambridge, MA (United States)) & Marquis, J.K. (Boston Univ., MA (United States). School of Medicine)
Item Type: Refine your search to only Report
open access

Particle acceleration with TE/sub 011/ cavity

Description: Presently, the maximum effective electric field, E/sub a/, in an accelerating structure is limited by the available peak rf power. If the structure is superconducting, the peak power requirements are reduced by several orders of magnitude but E/sub a/ is limited by electron loading caused by surface electric fields. A right circular cylinder TE/sub 011/ cavity has no surface electric fields and therefore, E/sub a/ is not limited by electron loading but can reach a much higher value which is lim… more
Date: September 1, 1979
Creator: Farkas, Z. D.
Item Type: Refine your search to only Article
Back to Top of Screen