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in subjects: "Tungsten"

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The collaborative program of research in engineering sciences

Research programs in the following areas are briefly described: High-Temperature Gas-Particle Reactions; Mathematical Modelling of Plasma Systems; Metal Transfer in Gas Metal-Arc Welding; Multivariable Control of Gas Metal-Arc Welding; Synthesis of Heat and Work Integration Systems for Chemical Process Plants; Parity Simulation of Dynamic Processes; Fundamentals of Elastic-Plastic Fracture: Three-Dimensional and Mechanistic Modelling; and Comminution of Energy Materials. Publications from each … more

Date: August 1, 1989

Creator: White, D.C.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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What can HELIOS tell us on phase transition of nuclear matter

Transverse energy (E/sub t/) distributions and P/sub t/ spectra of negative particles and photons measured by the HELIOS experiment in 200 GeVN and 60 GeVN oxygen-nucleus reactions are presented. The E/sub t/ distributions are compared to a geometrical parametrization and a Montereverse arrowCarlo calculation, particle spectra to the proton-nucleus reaction case. The comparisons show that yet the results can be understood without assuming quark-gluon plasma formation. A discussion is made based… more

Date: January 1, 1987

Creator: En'yo, H.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Development of passive electronic components for instrumentation of improved geothermal logging tools and components. Annual progress report

Short term objectives for well-logging instrumentation are circuits which can operate at temperatures in the range 275/sup 0/C to 350/sup 0/C; the medium term goal is operation up to 500/sup 0/C, and the long term goal is to achieve operation at 1000/sup 0/C. It is apparent that useful electronic circuits will require the combination of both passive components and active devices. In order to meet the compatibility requirements, the basic technology which has been selected in this project is the… more

Date: October 20, 1977

Creator: Raymond, L.S.; Hamilton, D.J. & Kerwin, W.J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Spectra of negative particles and photons in collisions of p/minus/W and /sup 16/O/minus/W at 200 GeVu

/rho//perpendicular/ spectra of negative particles were measured for p/minus/W and /sup 16/O/minus/W collisions at 200 GeVupsilon in the rapidity range 0.9< y <1.9. Within the systematic errors of 20% the spectra are indentical in the range 0.05 </rho//perpendicular/<2.0 GeVc. The p/minus/W and /sup 16/O /minus/W spectra exhibit an exponential shape for /rho//perpendicular/>250 MeVc. This is consistent with previous p/minus/A data, but there is a significant excess above this exponential at low… more

Date: January 1, 1987

Creator: Bartels, H.W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Direct observations of the primary state of radiation damage of ion-irradiated tungsten and platinum

A brief summary was presented of all the Cornell work on the primary state of radiation damage in ion-irradiated tungsten and platinum. The primary research tool for all this research was the field-ion microscope (FIM); the FIM was ideally suited for this research because of its excellent atomic resolution and the ability to examine the interior of the specimens, as a result of the field-evaporation effect. This paper summarized, in outline form, the following items: (1) the principal experimen… more

Date: July 1, 1980

Creator: Seidman, D. N.; Current, M. I.; Pramanik, D. & Wei, C. Y.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Thermal strains in titanium aluminide and nickel aluminide composites

Neutron diffraction was used to measure residual thermal strains developed during postfabrication cooling in titanium aluminide and nickel aluminide intermetallic matrix composites. Silicon carbide /Ti 14Al-21Nb, tungsten and sapphire/NiAl, and sapphire and SiC-coated sapphire/NiAl{sub 25}Fe{sub 10} composites were investigated. The thermal expansion coefficient of the matrix is usually greater than that of the fibers. As such, during cooldown, compressive residual strains are generated in the … more

Date: January 1, 1992

Creator: Saigal, A. (Tufts Univ., Medford, MA (United States). Dept. of Mechanical Engineering) & Kupperman, D.S. (Argonne National Lab., IL (United States))

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Depth distributions of low energy deuterium implantations in (110) tungsten: a theoretical model

The depth distributions of 80 eV D/sup +/ implants in (110) W have recently been measured by field desorption microscopy. Prominent structure, consisting of seven major and several minor peaks, is observed in the measured distributions. This contrasts with conventional implantation theory which predicts two peaks, one for the channeled D/sup +/ and one for the nonchanneled D/sup +/. The observed structure is explained in the present report by a model which ascribes the various peaks to D/sup +/… more

Date: March 1, 1978

Creator: Brice, D.K.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Design analysis and optimization of self-cooled lithium blankets and shields

A study of self-cooled lithium blankets was carried out to define the performance of these blankets and to determine the potential to operate at the maximum possible values of the performance parameters. The main design parameters considered during the course of the study were the tritium breeding ratio, the blanket energy multiplication factor, the energy fraction lost to the shield, the total blanket thickness, the reflector material selection, and the compositions of the different blanket zo… more

Date: February 1, 1988

Creator: Gohar, Y.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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CNC electrical discharge machining centers

Computer numerical control (CNC) electrical discharge machining (EDM) centers were investigated to evaluate the application and cost effectiveness of establishing this capability at Allied-Signal Inc., Kansas City Division (KCD). In line with this investigation, metal samples were designed, prepared, and machined on an existing 15-year-old EDM machine and on two current technology CNC EDM machining centers at outside vendors. The results were recorded and evaluated. The study revealed that CNC … more

Date: October 1, 1991

Creator: Jaggars, S.R.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Model for H/sup -/ and D/sup -/ production by hydrogen backscattering

The Marlowe Monte-Carlo backscattering code has been used to calculate particle reflection coefficients and energy distributions for H, D incident upon Li, K, Ni, Cu, Mo, Ag, Cs, Hf, W, Pt, and U surfaces. The backscattered energy and angular distributions are combined with a model for formation and survival probabilities for H/sup -/, D/sup -/ leaving the surface. A least-squares fit of experimental measurements of H/sup -/ yields from the composite surface, Cs/Cu, has been used to obtain two … more

Date: May 27, 1980

Creator: Hiskes, J.R. & Schneider, P.J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Comprehensive neutron cross-section and secondary energy distribution uncertainty analysis for a fusion reactor

On the example of General Atomic's well-documented Power Generating Fusion Reactor (PGFR) design, this report exercises a comprehensive neutron cross-section and secondary energy distribution (SED) uncertainty analysis. The LASL sensitivity and uncertainty analysis code SENSIT is used to calculate reaction cross-section sensitivity profiles and integral SED sensitivity coefficients. These are then folded with covariance matrices and integral SED uncertainties to obtain the resulting uncertainti… more

Date: May 1, 1980

Creator: Gerstl, S.A.W.; LaBauve, R.J. & Young, P.G.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Single atom sputtering events: direct observation of near-surface depleted zones in ion-irradiated tungsten

The three-dimensional spatial arrangement of vacancies contained in depleted zones (DZs), of ion-irradiated tungsten specimens, was determined with atomic resolution by the field-ion microscope (FIM) technique. These DZs were detected in the near-surface region of specimens which had been irradiated in situ at less than or equal to15 K with 20 keV W/sup +/, 30 keV W/sup +/, Kr/sup +/, Cu/sup +/, or Ar/sup +/ ions. The values of the ion dose employed were small (less than or equal to 10/sup 13/ … more

Date: March 1, 1980

Creator: Current, M. I.; Wei, C. Y. & Seidman, D. N.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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ERDA/NASA advanced thermionic technology program. Progress report No. 27

Research progress is briefly outlined in the areas of activation experiments, enhanced mode conversion experiments, converter development (tungsten emitter, lanthanum hexaborate collector), and hot shell development. (WHK)

Date: September 1, 1977

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Super high energy heavy ion collisions

Basic theoretical ideas on a phase transition to a plasma of free quarks and gluons in heavy ion collisions are outlined. First results from experiments with oxygen beams at 14.5 GeV/c/N (BNL), 60 and 200 GeV/c/N (CERN) are discussed. 30 refs., 9 figs.

Date: December 1, 1987

Creator: Geist, W.M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Uranium hydrogeochemical and stream sediment reconnaissance data release for the Elk City NTMS Quadrangle, Idaho/Montana, including concentrations of forty-five additional elements

Totals of 1580 water and 1720 sediment samples were collected from 1754 locations in the quadrangle. Elemental concentration, field measurement, weather, geologic, and geographic data for each sample location are listed for waters in Appendix I-A and for sediments in Appendix I-B. Uranium/thorium ratios for sediment samples are also included in Appendix I-B. All elemental analyses were performed at the LASL. Water samples were initially analyzed for uranium by fluorometry. All water samples con… more

Date: July 1, 1980

Creator: Broxton, D. E. & Beyth, M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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DOE/JPL advanced thermionic technology program. Progress report No. 42

Progress is reported on the following tasks: (I) surface and plasma investigations, (II) low-temperature converter development, (III) enhanced mode converter experiments, (IV) component hardware development, (V) thermionic power module system studies, (VI) thermionic array module development, (VII) high-temperature converter evaluation, (VIII) advanced converter studies, (IX) postoperational diagnostics, (X) cylindrical converter component development, and (XI) correlation of design interfaces.… more

Date: January 1, 1980

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Chemical Engineering Division Fuel Cycle Programs. Quarterly progress report, January-March 1979

In the program on pyrochemical and dry processing methods (PDPM) for nuclear fuel, corrosion testing of refractory metals and alloys, graphite, and SiC in PDPM environments was done. A tungsten-metallized Al/sub 2/O/sub 3/-3% Y/sub 2/O/sub 3/ crucible was successfully fabricated. Tungsten microstructure of a plasma-sprayed tungsten crucible was stabilized by nickel infiltration and heat treatment. Solubility measurements of Th in Cd and Cd-Mg alloys were continued, as were experiments to study … more

Date: January 1, 1980

Creator: Steindler, M J; Ader, M & Barletta, R E

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Effect of plasma surface interactions on PLT plasma parameters

This paper gives a brief description of the geometry and parameters of the PLT tokamak, reviews some of the last four years' results that are particularly relevant to plasma-boundary interactions, and then concentrates on two specific problems.

Date: July 1, 1980

Creator: Meservey, E.B.; Arunasalam, V. & Barnes, C.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Studies of the /sup 32/S + /sup 182/W reaction

Fission-like products from the reaction /sup 32/S + /sup 182/W were measured over the entire angular range from theta = 10-170/sup 0/ and for bombarding energies of E/sub lab/ = 166, 177, 222, and 260 MeV using an array of eight Si detectors. From the measured energy and flight time the product mass was determined event-by-event by performing the appropriate corrections for the plasma delay and pulse height defect associated with Si detectors. The mass, angular, and total kinetic energy distrib… more

Date: January 1, 1986

Creator: Back, B. B.; Keller, J. G.; Worsham, A.; Glagola, B. G.; Henderson, D.; Kaufman, S. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Engineering data bases for refractory alloys

Refractory alloys based on niobium, molybdenum, tantalum, and tungsten are required for the multi-100kW(e) space nuclear reactor power concepts that have been assessed in the SP-100 Program because of the extremely high temperatures involved. A review is presented of the technology efforts on the candidate refractory alloys in the areas of availability/fabricability, mechanical properties, irradiation effects, and compatibility. Of the niobium-base alloys, only Nb-1Zr has a data base that is su… more

Date: January 1, 1985

Creator: Cooper, R.H. Jr. & Harms, W.O.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Utilization of geothermal energy in the mining and processing of tungsten ore. Quarterly report

The status of the engineering and economic feasibility study of utilizing geothermal energy for the mining and processing of tungsten ore at the Union Carbide-Metals Division Pine Creek tungsten complex near Bishop, Calfironia is reviewed. Results of geophysical data analysis including determination of assumed resource parameters are presented. The energy utilization evaluation identifies potential locations for substituting geothermal energy for fossil fuel energy using current technology. Pre… more

Date: February 1, 1980

Creator: Lane, C.K.; Erickson, M.V. & Lowe, G.D.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Spallation target-moderator-reflector studies at the Weapons Neutron Research facility. [800-MeV p]

Basic neutronics data, initiated by 800-MeV proton spallation reactions, are important to spallation neutron source development and electronuclear fuel production. Angle-dependent and energy-dependent neutron production cross sections, energy-dependent and total neutron yields, thermal and epithermal neutron surface and beam fluxes, and fertile-to-fissile conversion ratios are being measured. The measurements are being done at the Weapons Neutron Research facility on a variety of targets and ta… more

Date: January 1, 1980

Creator: Russell, G. J.; Gilmore, J. S.; Prael, S. D.; Robinson, H. & Howe, S. D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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High temperature heat pipes for waste heat recovery

Operation of heat pipes in air at temperatures above 1200/sup 0/K has been accomplished using SiC as a shell material and a chemical vapor deposit (CVD) tungsten inner liner for protection of the ceramic from the sodium working fluid. The CVD tungsten has been used as a distribution wick for the gravity assisted heat pipe through the development of a columnar tungsten surface structure, achieved by control of the metal vapor deposition rate. Wick performance has been demonstrated in tests at ap… more

Date: January 1, 1980

Creator: Merrigan, M.A. & Keddy, E.S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Microlaminate composite structures by low pressure plasma spray deposition

The low pressure plasma spray (LPPS) process has been utilized in the development and fabrication of metal/metal, metal/carbide, and metal/oxide composite structures; including particulate dispersion and both continuous and discontinuous laminates. This report describes the LPPS process and the development of copper/tungsten microlaminate structures utilizing this processing method. Microstructures and mechanical properties of the Cu/W composites are compared to conventionally produced constitu… more

Date: January 1, 1988

Creator: Castro, R. G. & Stanek, P. W.

Item Type: Article

Partner: UNT Libraries Government Documents Department