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Extracted current densities from surface conversion sources of negative ions

Description: The condition for extracting a maximum negative ion current density is found when the product of the radius of the negative ion conversion electrode, the cross-section for negative and positive ion recombination, and the density of positive ions in the ion source equals one. The optimum output is obtained at the highest positive ion density and the smallest electrode radius.
Date: February 10, 1982
Creator: Fink, J.H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Tar sand extraction by steam stimulation and steam drive: measurement of physical properties

Description: The measurement of the following thermophysical properties of Utah tar sands is in progress: thermal conductivity, specific heat relative permeability, and viscosity (of the recovered bitumen). During the report period (October 1, 1978 to November 1, 1979), experimental procedures have been developed and a basic data set has been measured. Additionally, standard core analysis has been performed for four drill sites in the Asphalt Ridge, Utah area.
Date: September 10, 1980
Creator: Linberg, W.R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

System for producing a uniform rubble bed for in-situ processes

Description: A method and a cutter are disclosed for producing a large cavity filled with a uniform bed of rubblized oil shale or other material, for in-situ processing. A raise drill head has a hollow body with a generally circular base and sloping upper surface. A hollow shaft extends from the hollow body. Cutter teeth are mounted on the upper surface of the body and relatively small holes are formed in the body between the cutter teeth. Relatively large peripheral flutes around the body allow material to… more
Date: April 10, 1981
Creator: Galloway, Terry R.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
open access

Upgrade of the Proton West secondary beamline

Description: As originally designed and operated, protons entering PW6 were steered by a series of EPB dipoles into a single interaction length beryllium target, some 43 feet from the enclosure wall. Ensuing secondary beams, either p{sup +}/{pi}{sup +} or p{sup -}/{pi}{sup -}, were collected by a string of quadrupoles following the target, steered westward, away from the Proton Center line, through PW6 and PW7, and ultimately focussed on experiment production targets located within the large PW8 hall. Aroun… more
Date: October 10, 1989
Creator: Spiegel, L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Analytical model for the dynamic resistivity of electrically-exploded conductors

Description: A detailed model for the dynamic resistivity of an exploding conductor presents many difficulties. An electrically-exploded conductor undergoes significant hydrodynamic expansion as it is heated. Resistivity is a function of both the temperature and density of a conductor and realistic models for resistivity over the range of parameter space experienced by an exploding conductor are quite complex. See for example, the model of Lee and More (1984). Calculation of the hydrodynamic expansion of th… more
Date: October 10, 1986
Creator: Lee, R. S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Heavy recycle solvent studies in two-stage coal liquefaction. Final technical report, September 1, 1982-December 30, 1983

Description: The objective of this program has been to study the chemistry of the components with high boiling points in a direct coal liquefaction recycle solvent and to identify those components which lead to higher overall yields and improved product stability in the initial coal dissolution step of direct coal liquefaction processes. The major conclusions are: -454 C recycle solvent is primarily aromatic hydrocarbons (73%) and contains almost no asphaltenes; +454 C recycle solvent is primarily asphalten… more
Date: January 10, 1984
Creator: Longanbach, J. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Experimental observations and model calculations of impurity radiation in a plasma gun compact torus experiment

Description: Several types of radiation measurements were performed on the Beta II compact forms experiment. Among these are time integrated spectra ranging in wavelength from the vuv to the uv, time resolved bolometer measurements of radiation from the x-ray to the infrared, and time and wavelength resolved measurements of certain spectral lines. It is difficult to relate any one of these measurements to plasma parameters of interest such as temperature, density, or impurity content. In this report we comp… more
Date: August 10, 1982
Creator: Goldenbaum, G. C.; Granneman, E. H. A.; Hartman, C. W.; Prono, D. S.; Taska, J. & Turner, W. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Time series analysis of reactor thermocouple data. [LMFBR]

Description: Time-series analysis techniques are applied to nuclear reactor thermocouple data to investigate coolant temperatures measured within the fueled test assembly. The coolant temperature distribution within a fuel assembly affects the length of time a fuel assembly may be operated in a power reactor and, therefore, is an important economic consideration in the design of reactor fuel systems. Frequency-domain signal conditioning techniques were used to reveal the smoothly varying thermocouple signal… more
Date: April 10, 1980
Creator: Devary, J.L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Americium purification by a combined anion exchange and bidentate organophosphorus solvent extraction process. [Patent application]

Description: Americium is separated from mixtures containing plutonium, other actinides, and other non-lanthamide impurities, by a combined process of anion exchange resin sorption to remove plutonium, and a bidentate organophosphorus solvent extraction of americium of the anion exchange resin effluent. Dihexyl-N,N-diethylcarbamylmethylenephosphonate is a preferred solvent. The initial mixture may be subjected to a cation exchange operation to remove monovalent impurities. The process is especially effectiv… more
Date: April 10, 1981
Creator: Navratil, J.D. & Martella, L.L.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Music for S

Description: Recording of Stanislaw Krupowicz's Music for S. The work is a computer generated tape, composed at CCRMA, Stanford University using additive synthesis and John Chowning's voice simulation instrument.
Access: Restricted to UNT Community Members. Login required if off-campus.
Date: March 10, 1984
Duration: 9 minutes 19 seconds
Creator: Krupowicz, Stanisław, 1952-
Item Type: Refine your search to only Sound
Partner: UNT Music Library
open access

Radiation in the SLC final focus alcoves from beam losses in collimators and dumps

Description: Radiation levels inside the final focus alcoves are calculated from the main dump, tune-up dumps, and adjustable collimators. Neutron calculations are done for giant resonance neutrons. Fluences of neutrons and photons in the alcoves are determined. It is concluded that, if the beam losses do indeed occur as believed, many of the electronic components in the alcoves will begin to fail after a very short running period. (LEW)
Date: September 10, 1986
Creator: Jenkins, T.M. & McCall, R.C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Benefit-cost analysis of DOE's Current Federal Program to increase hydrothermal resource utilization. Final report

Description: The impact of DOE's Current Federal Program on the commercialization of hydrothermal resources between 1980 and 2000 is analyzed. The hydrothermal resources of the United States and the types of DOE activities used to stimulate the development of these resources for both electric power and direct heat use are described briefly. The No Federal Program and the Current Federal Program are then described in terms of funding levels and the resultant market penetration estimates through 2000. These m… more
Date: December 10, 1981
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Thermal Control System and Method for a Passive Solar Storage Wall

Description: A system and method are provided for controlling the storing and release of thermal energy from a thermal storage wall wherein said wall is capable of storing thermal energy from insolation. The system and method includes a device such as a plurality of louvers spaced a predetermined distance from the thermal wall for regulating the release of thermal energy from the thermal wall. This regulating device is made from a material which is substantially transparent to the incoming solar radiation s… more
Date: July 10, 1981
Creator: Ortega, Joseph Kenneth Earl
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
open access

Preliminary analysis of a target factory for laser fusion

Description: An analysis of a target factory leading to the determination of production expressions has provided for the basis of a parametric study. Parameters involving the input and output rate of a process system, processing yield factors, and multiple processing steps and production lines have been used to develop an understanding of their dependence on the rate of target injection for laser fusion. Preliminary results have indicated that a parametric study of this type will be important in the selecti… more
Date: June 10, 1980
Creator: Sherohman, J.W. & Hendricks, C.D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Synthesis and characterization of a new silicone multiblock polymer

Description: The Lawrence Livermore National Laboratory (LLNL) has an active interest in the synthesis of new polysiloxanes as base polymers for cellular silicone materials. These elastomers have properties uniquely suited to very specific engineering requirements. While the polymers which we have prepared via random equilibrium of various cyclic tetrasiloxanes have adequate properties for certain applications, there is evidence to suggest that alternating block polysiloxanes prepared via condensation-polym… more
Date: May 10, 1982
Creator: Riley, M.O.; Kolb, J.R. & Jessop, E.S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Scaling of current density, total current, emittance, and brightness for hydrogen negative ion sources

Description: The atomic and molecular processes that play a principal role in negative ion formation in a hydrogen negative ion discharge are discussed. The collisions of energetic electrons with gas molecules within the discharge lead to vibrationally excited molecules. Thermal electrons in turn attach to these excited molecules and generate negative ions via the dissociative attachment process. A system geometry chosen to optimize these collision processes is discussed that consists of a high-power discha… more
Date: July 10, 1986
Creator: Hiskes, J.R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Transposable elements and genetic instabilities in crop plants

Description: Transposable elements have long been associated with certain unstable loci in maize and have been intensively studied by McClintock and others. It is known that a transposable element can control the expression of the structural genes at the locus where it resides. These controlling elements in maize are now beginning to be studied at the molecular level. Using recombinant molecular probes we have been able to describe the changes induced by the controlling element Ds at the shrunken locus. Ds … more
Date: April 10, 1981
Creator: Burr, B. & Burr, F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Radiation damage measurements on rock salt and other minerals for waste disposal applications. Quarterly report, January 1, 1980-March 31, 1980

Description: Different aspects of radiation damage in both synthetic NaCl crystals and various natural rock salt samples as well as granite, basalt and other minerals which will be important for radioactive waste disposal applications are being investigated. The principal means of measuring radiation damage is the determination of F-center concentrations, and the concentration and size of sodium metal colloid particles. Formation of these and other defects during irradiation and the annealing of defects and… more
Date: April 10, 1980
Creator: Swyler, K. J.; Loman, J. M.; Teutonico, L. J.; Elgort, G. E. & Levy, P. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Uniform laser ablative acceleration of targets at 10/sup 14/ W/cm/sup 2/

Description: We present the first detailed investigations of the ablative acceleration of planar targets while simultaneously using high irradiance (10/sup 14/ W/cm/sup 2/), large focal diameters (1 mm) and long laser pulse duration (3 nsec). Included are measurements of target preheat, ablation pressures and uniformity achieved under these conditions. Targets were accelerated to high velocities with velocity profile uniformity approaching that required for high gain pellet implosions.
Date: August 10, 1982
Creator: Obenschain, S. P.; Whitlock, R. R.; McLean, E. A.; Ripin, B. H.; Price, R. H.; Phillion, D. W. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Pressure limits of negative ion sources based upon gas efficiency and extracted ion-current density

Description: The nature of the electrical discharge has an obvious impact upon the gas efficiency of an ion source and on the current density whch can be drawn from it. However external factors, such as the conductance of the grids and the background pressure along the beamline, also have an effect. Simple approximations based upon these factors show that there is a lower limit to the pressure of an ion source, which can deliver an ion beam of given current density at a specific gas efficiency. Estimates of… more
Date: March 10, 1982
Creator: Fink, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

SLAC Divertor Channel Entrance Thermal Stress Analysis

Description: X-ray beams emerging from the new SLAC electron-positron storage ring (PEP) impinge on the entrance to tangential divertor channels causing highly localized heating in the channel structure. Analyses were completed to determine the temperatures and thermally-induced stresses due to this heating. These parts are cooled with water flowing axially over them at 30/sup 0/C. The current design and operating conditions should result in the entrance to the new divertor channel operating at a peak tempe… more
Date: July 10, 1985
Creator: Johnson, Gary L.; Stein, Werner; Lu, Stephen C. & Riddle, Robert A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Importance of high order momentum terms in SLC optics

Description: The evaluation of background levels at the SLC relies, in several cases, on the proper representation of how low momentum electrons propagate through the Arcs and the Final Focus System (FFS). For example, beam - gas bremsstrahlung in the arcs causes electrons of up to 6% energy loss to be transported through to the IP; secondary showers on edges of masks and collimators yield debris with a very wide momentum spectrum. This note is a naive attempt at checking the validity of TRANSPORT and TURTL… more
Date: July 10, 1985
Creator: Kozanecki, W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Energy generation in convective shells of low mass, low metallicity stars

Description: We report on the non-negligible energy generation from the {sup 13}C neutron source and neutron capture reactions in low mass, low metallicity AGB stars. About 10{sup 4} L{sub {circle dot}} are generated within the thermal pulse convective shell by the combination of the {sup 13}C({alpha}, n){sup 16}O rate and the sum of the Y(Z,A)(n,{gamma})Y(Z,A + 1) reactions and beta decays. The inclusion of this energy source in an AGB thermal pulse evolution is shown to alter the evolution of the convecti… more
Date: November 10, 1989
Creator: Bazan, G. (Illinois Univ., Urbana, IL (USA). Dept. of Astronomy) & Lattanzio, J.C. (Lawrence Livermore National Lab., CA (USA))
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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