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Tumor production in Syrian hamsters following inhalation of PuO/sub 2/--ZrO/sub 2/ aerosol

Description: Syrian golden hamsters of both sexes were exposed to aerosols of ZrO/sub 2/ containing PuO/sub 2/. The starting material in the aerosol generator also had a small amount of /sup 57/Co added as a tracer. The mixture of all three constituents was nebulized and the droplets passed through a heating column at 1000/sup 0/C. Aerosol sampling was accomplished with a cascade impactor and electrostatic precipitator. The median aerodynamic diameters in all inhalation runs were approximately 2 ..mu..m wit… more
Date: January 1, 1978
Creator: Thomas, R. G. & Smith, D. M.
Partner: UNT Libraries Government Documents Department
open access

Thorium fuel cycles for LWRs: fuel diversion assessments and recycle requirements

Description: A number of fuel cycles have been proposed for evaluation in the nonproliferation alternative systems assessment program. Among these systems are light water reactors (LWR) operating on the thorium-uranium cycle or the plutonium-thorium cycle either inside or outside energy centers. These proposals support the President's nuclear power policy of accelerating research into alternative fuel cycles that do not permit direct access to materials usable for nuclear weapons but still retain the benefi… more
Date: January 1, 1978
Creator: Carter, W. L.; Rainey, R. H. & Johnson, D. R.
Partner: UNT Libraries Government Documents Department
open access

Technique for dynamic range reduction for Landsat ratio images

Description: The LANDSAT ratio image, obtained by dividing one MSS band by another on a point-by-point basis, has become an established tool for geological applications over the past several years. Display of such images can be difficult since the dynamic range can extend from zero to infinity. A scheme for dynamic range reduction, based on a mathematical model of the multispectral image, is presented. It can be implemented on stand-alone digital image processing systems as well as general purpose computers… more
Date: January 1, 1978
Creator: Wecksung, G.W. & Breedlove, J.R. Jr.
Partner: UNT Libraries Government Documents Department
open access

Radiation instrumentation

Description: Separate abstracts have been prepared for items within the scope of the energy data base.
Date: January 1, 1978
Creator: Wadman, W.W. III (ed.)
Partner: UNT Libraries Government Documents Department
open access

Dielectric strengths of new gases and gas mixtures

Description: It is emphasized that the most effective gaseous dielectrics are gas mixtures with components chosen on the basis of fundamental physicochemical knowledge, especially on low-energy electron-molecule interactions. On the basis of such lnowledge, especially on electron attachment and electron slowing down, a number of new gases and gas mixtures have been found with breakdown strengths superior to pure SF/sub 6/. These include the unitary gases c-C/sub 4/F/sub 8/ (perfluorocyclobutane), C/sub 4/F/… more
Date: January 1, 1978
Creator: James, D.R.; Christophorou, L.G.; Pai, R.Y.; Pace, M.O.; Mathis, R.A.; Sauers, I. et al.
Partner: UNT Libraries Government Documents Department
open access

Liquid waste handling facilities for a conceptual LWR spent fuel reprocessing complex

Description: The waste evaporator systems and the methods for evaporating the liquid wastes of various radioactivity levels are discussed. After the liquid wastes are evaporated and nitric acid is recovered the high-level liquid waste is incorporated into borosilicate glass and the intermediate-level liquid waste into concrete for final disposal. (LK)
Date: January 1, 1978
Creator: Witt, D.C. & Bradley, R.F.
Partner: UNT Libraries Government Documents Department
open access

Fiber optics and microprocessors: a control-system solution for the laser-fusion environment

Description: The use of fiber optics and microprocessors in a distributed computer control system for a 100-kJ CO/sub 2/ laser fusion facility is described. Gas-laser control systems must operate in an environment in which megavolt Marx circuits generate megampere discharges in the laser amplifiers, with attendant high electromagnetic fields. By linking the distributed controls with fiber optics the adverse effect of these fields on the hard-wired controls is mimimized, and the additional advantage of groun… more
Date: January 1, 1978
Creator: Thuot, M.E.
Partner: UNT Libraries Government Documents Department
open access

Tapered fluidized-bed bioreactor: an improved device for continuous cultivation

Description: The bioreactor concept utilizing a tapered fluidized bed has shown considerable promise for use in bioprocesses where the biological agents can be immobilized on a fluidizable solid phase, but the operating characteristics of such a reactor are not yet fully understood. A simple mathematical model (steady state, plug flow conditions) has been developed and tested with experimental data, and calculated values compare favorably with experimental values. A more complete and presumably more valid m… more
Date: January 1, 1978
Creator: Pitt, Jr., W. W.; Hancher, C. W.; Scott, C. D. & Hsu, H. W.
Partner: UNT Libraries Government Documents Department
open access

Nondestructive evaluation of LWR spent fuel shipping casks

Description: An analysis of nondestructive testing (NDT) methods currently being used to evaluate the integrity of Light Water Reactor (LWR) spent fuel shipping casks is presented. An assessment of anticipated NDT needs related to breeder reactor cask requirements is included. Specific R and D approaches to probable NDT problem areas such as the evaluation of austenitic stainless steel weldments are outlined.
Date: February 1, 1978
Creator: Ballard, D. W.
Partner: UNT Libraries Government Documents Department
open access

Presence of UV-endonuclease sensitive sites in daughter DNA of UV-irradiated mammalian cells. [3H-thymidine tracer]

Description: Asynchronous Chinese hamster cells were irradiated with 10 Jm/sup -2/ uv radiation and 0.25 to 4 hours later pulse-labeled with (/sup 3/H)thymidine. Cells synchronized by shaking off mitotic and G/sub 1/ cells were irradiated in either the G/sub 1/-phase or S-phase of the cell cycle and pulse-labeled with (/sup 3/H)thymidine in the S-phase. After a 12 to 14 hour chase in unlabeled medium, the DNA was extracted, incubated with Micrococcus luteus uv-endonuclease and sedimented in alkaline sucrose… more
Date: February 1, 1978
Creator: D'Ambrosio, S. & Setlow, R.B.
Partner: UNT Libraries Government Documents Department
open access

Simple empirical method for estimating the performance of a passive solar heated building of the thermal storage wall type

Description: Two methods are presented for estimating the annual solar heating performance of a building utilizing a passive thermal storage wall of the Trombe wall or water wall type with or without night insulation and with or without a reflector. The method is accurate to +-3% as compared with hour-by-hour computer simulations.
Date: January 1, 1978
Creator: Balcomb, J.D. & McFarland, R.D.
Partner: UNT Libraries Government Documents Department
open access

Investigation of cooling coil corrosion in storage tanks for radioactive waste

Description: The high frequency of cooling coil leaks observed in high-heat waste storage tanks soon after sludge removal operations is attributed to pitting, according to laboratory corrosion studies. Experiments show that the most likely series of events leading to coil leakage is (1) excessive dilution of basic nitrite in the supernate, (2) initiation of attack in crevices due to oxygen depletion cells, and (3) acceleration of the attack by sulfate dissolved from the sludge. When sludge was slurried with… more
Date: January 1, 1978
Creator: Ondrejcin, R.S.
Partner: UNT Libraries Government Documents Department
open access

Impacts of the national energy programme on solar economics

Description: The National Energy Plan (NEP) sets as a goal the use of solar energy in two and a half million homes in 1985. A key provision of the NEP (as well as congressional alternatives) provides for the subsidization of solar equipment. The extent to which these subsidies (income tax credits) might offset the impact of continued energy-price control is examined. Regional prices and availability of conventional energy sources (oil, gas, and electricity) were compiled to obtain a current and consistent s… more
Date: January 1, 1978
Creator: Ben-David, S.; Noll, S.; Roach, F. & Schulze, W.
Partner: UNT Libraries Government Documents Department
open access

Germanium detector system for the detection of transuranics at low-activity concentrations in soil. [/sup 241/Am, /sup 240/Pu, /sup 239/Pu, /sup 238/U, /sup 232/Th]

Description: A photon spectroscopy system is described which is designed for the detection of plutonium and /sup 241/Am in soil samples with a minimum turnaround time. Quantification is based upon the 60-keV gamma emitted in /sup 241/Am decay and upon the uranium L x-rays (energies from 13 to 22 keV) emitted by plutonium isotopes during alpha decay. The detector is a single-crystal, intrinsic-germanium-planar detector with a surface area of 21 cm/sup 2/. Sensitivity is increased by incorporating a detector … more
Date: January 1, 1978
Creator: West, L.; Umbarger, C.J. & Dempsey, T.
Partner: UNT Libraries Government Documents Department
open access

Geothermal environmental seminar-'78

Description: Thirty-seven papers are included. Two were abstracted for EDB previously. Abstracts were prepared for the remaining thirty-five. (MHR)
Date: January 1, 1978
Creator: Tucker, F. L. & Tanner, L. R.
Partner: UNT Libraries Government Documents Department
open access

Initial results from the first Los Alamos hot dry rock energy system

Description: The pressurized-water loop for extraction of natural heat from dry crustal rock is, as this is written, eight weeks into its initial long-term continuous circulation test. During most of this time, flow-impedance through the man-made fracture system has decreased continuously so that, with a nearly constant pressure difference between injection and recovery wells, flow rate has increased steadily to the maximum capacity of the surface piping--about 16 liters per second. Temperature of water ent… more
Date: January 1, 1978
Creator: Smith, M.C.
Partner: UNT Libraries Government Documents Department
open access

Preconcentration of plutonium radionuclides from natural waters. [Pu in Eniwetok ground water, lagoon and open ocean waters]

Description: A large volume water sampler using manganese dioxide impregnated cartridges for the in situ separation of plutonium in sea water and ground water was studied. Plutonium concentrations obtained by this technique are compared with a radiochemical coprecipitation method. Consistent results were obtained between the two methods for water samples from the Pacific Ocean and Enewetak lagoon. Different results were noted from samples collected in the Enewetak reef and ground water stations. Using this … more
Date: February 1, 1978
Creator: Wong, K. M.; Nioshkin, V. E. & Jokela, T. A.
Partner: UNT Libraries Government Documents Department
open access

Hot dry rock, an alternate geothermal energy resource: a challenge for instrumentation

Description: The natural internal heat from the Earth is one of the cleanest, nearly inexhaustible energy sources. The hot dry rock that composes most of the Earth's crust has the potential of becoming one of the largest reservoirs of energy economically available in the near future. The Los Alamos Scientific Laboratory, for the past five years, has been working toward exploiting this very abundant, clean energy source. The LASL technique to demonstrate the technical and economic feasibility of extracting h… more
Date: January 1, 1978
Creator: Dennis, B.R. & Horton, E.H.
Partner: UNT Libraries Government Documents Department
open access

Studies of evaporative and conventional cooling of an energy conserving California house

Description: For cooling a Sacramento, California home, (1) higher thermostat settings, (2) insulation (3) ''solar control'' window shades, and (4) the use of an evaporative cooler in the place of a vapor compression cycle air conditioner are studied. A computer program TWOZONE is used to evaluate the effect on energy consumption and peak power. It is calculated that the peak cooling load can be reduced by a factor of 5 or more and the total energy by a factor of 20 or more.
Date: March 1, 1978
Creator: Gates, S.D.; Baughn, J. & Rosenfeld, A.H.
Partner: UNT Libraries Government Documents Department
open access

Removal of uv-induced pyrimidine dimers from the replicated and unreplicated DNA of human fibroblasts

Description: Excision repair in uv irradiated human fibroblasts has been examined in portions of DNA replicating after irradiation versus those remaining unreplicated. Two approaches, one using a uv-endonuclease to estimate pyrimidine dimers remaining in DNA, the other using density labeling to measure excision resynthesis, indicate that the extent of repair is the same for both replicated and unreplicated DNA.
Date: January 1, 1978
Creator: Waters, R.
Partner: UNT Libraries Government Documents Department
open access

Prediction of electron beam welding spiking tendency

Description: On the basis of measured temperature distributions in electron beam welding cavities it is shown that the vapor pressure force dominates in the lower region and the surface tension in the upper region. The region where these two forces are approximately equal is unstable and the surface tension force causes inward flow of liquid metal which tends to form a projection. For a specific material this projection location was found to depend on cavity depth. By postulating that the formation of liqui… more
Date: February 1, 1978
Creator: Schauer, D. A. & Geidt, W. H.
Partner: UNT Libraries Government Documents Department
open access

Computer graphics for extracting information from data

Description: Computer graphics which are useful for displaying and analyzing data are presented. Many classical and several newly developed graphical techniques in statistical data analysis are presented for small univariate and multivariate data sets. These include histograms, empirical density functions, pie charts, contour plots, a discriminant analysis display, cluster analysis, Chernoff ''faces,'' Andrews' sine curves, three-dimensional plots, and probability plots. Recent advances in data collection t… more
Date: January 1, 1978
Creator: Lohrding, R. K.; Johnson, M. M. & Whiteman, D. E.
Partner: UNT Libraries Government Documents Department
open access

Simulation experiments and solar wind sputtering

Description: In order to isolate the role played by solar wind sputtering from other lunar surface phenomena a number of simulation experiments were performed, including isotope abundance measurements of Ca sputtered from terrestrial fluorite and plagioclase by 50-keV and 130-keV /sup 14/N beams, measurement of the energy distribution of U atoms sputtered with 80-keV /sup 40/Ar, and measurement of the fraction of sputtered U atoms which stick on the surfaces used to collect these atoms. 10 references. (JFP)
Date: January 1, 1978
Creator: Griffith, J. E.; Papanastassiou, D. A.; Russell, W. A.; Tombrello, T. A. & Weller, R. A.
Partner: UNT Libraries Government Documents Department
open access

Distinction between the roles of O/sub 2/ and of O/sup -//sub 2/ in biological radiodamage

Description: The paper attempts to elucidate the roles of oxygen and superoxide radical in biological damage due to ionizing radiation. Specifically, the effect of gamma radiation on the survival of T4 bacteriophage and of E. coli B has been investigated. (ACR)
Date: January 1, 1978
Creator: Samuni, A.; Chevion, M.; Halpern, Y. S.; Ilan, Y. A. & Czapski, G.
Partner: UNT Libraries Government Documents Department
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