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Emission Characteristics of Tantalum, Tungsten, Rhenium, and Iridium in Plasma Diodes

Description: Experimental determinations of the ionic and electronic emission characteristics of Ta, W, Re, and lr cathodes in vapor thermionic converters are compared. It is shown that Ta provides superior thermal ionization qualities at high pressure compared with W, Re, and Lr. High electronic current densities may be obtained from Cs on Re and Cs on Ir at much lower Cs vapor pressures than from Ta or W. An over-all efficiency of 19% was achieved with a Re cathode at 2440 deg K. (auth)
Date: March 15, 1962
Creator: Gust, W. H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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RELEASE OF FISSION GASES FROM THE AE-6 REACTOR ON MARCH 25, 1959

Description: An analysis was made of the fission-gas-release incident during the pressure pumpdown of the AE-6 Reactor resulting in the contamination of the reactor room and members of the operating staff. Descriptions are given of the normal core pumping procedures, procedural alterations during the incident, the discovery of the contamination and its possible causes, and the remedial actions taken. Steps taken to minimize the chance of the occurrence of the contamination in the future are listed. (B.O.G.)
Date: April 15, 1959
Creator: Blackshaw, G.L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Enthalpy measurement of coal-derived liquids. Quarterly technical progress report, July-September 1980

Description: Equipment modifications to a Freon 11 boil-off type calorimeter are described. The calorimetric system was used to measure the enthalpies of thiophene experimentally. Data were taken over a temperature range of 100/sup 0/F to 750/sup 0/F at pressures of 50, 100, 200, 400, 600, 825.9 (the critical), 1000, and 1500 psia. Thermodynamic properties derived from the data are compared to values in the literature, and the agreement is exceptionally good. The data are then compared directly to results c… more
Date: September 15, 1980
Creator: Kidnay, A. J. & Yesavage, V. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Mechanisms affecting mass transfer in fuel cells

Description: An initial analysis of particulate effects on molten carbonate fuel cells has been conducted. The analysis has been applied to a conceptual fuel cell with operating parameters appropriate to use with future power generation plants. Particle transport due to several mechanisms has been considered and dominant mechanisms affecting particle delivery to anode channel surfaces and into anode pores have been identified. Thermophoresis and gas flow out from anode pores have been found to inhibit parti… more
Date: March 15, 1982
Creator: Wenglarz, R.A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Safety Calculations for MsSRE

Description: A number of conceivable reactivity accidents were analyzed, using conservatively pessimistic assumptions and approximations, to permit evaluation of reactor safety. Most of the calculations, which are described in detail, were performed by a digital kinetics program, MURGATROYD. Some analog analyses were also made. None of the accidents which were analyzed lead to catastrophic failure of the reactor, which is the primary consideration. Some internal damage to the reactor from undesirably high t… more
Date: May 15, 1962
Creator: Haubenreich, P.N. & Engel, J.R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Assessment of deposition for power-plant molten-carbonate fuel cells

Description: Particulate deposition in molten carbonate fuel cell anodes is addressed for operation with future coal gasification power plants. Power plant systems factors affecting deposition are explored such as gas cleanup requirements for particulate removal and gasifier product gas composition differences for various gasifier types and operational modes (air blown versus oxygen blown). Effects of fuel cell characteristics (including average cell current density and fuel utilization) on anode deposition… more
Date: March 15, 1982
Creator: Wenglarz, R. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Deploymerization of coal by direct solvent attack. Semi-annual report, April 1, 1983-August 31, 1983

Description: The depolymerization of Illinois No. 6 coal by a series of solvents having different basecities (pK/sub a/) and nucleophilicities (Swain-Scott nu values) showed no dependence on either the basicity of nucleophilicity of the solvents. As expected, the conversion decreases as the temperature of the reaction is reduced, but the lower the reaction temperature, the higher the percentage of amine incorporation becomes in the products. 5 tables.
Date: September 15, 1983
Creator: Larsen, J. W. & Mohammadi, M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Thermoelectric Materials. Final Report, January 28, 1959-July 28, 1960

Description: BS> A method for the measurement of thermal conductivities of electrically conducting materials at temperatures in excess of 1000 deg C with a high accuracy was devised. The spatial boron concentration gradient in boron- doped graphite to achieve maximum p-type thermoelectric output was established. The production of an n-type silicon carbide-graphite composit was studied. Theoretical studies produced a detailed picture of the effect of doping on the electronic properties of graphite. A method … more
Date: August 15, 1960
Creator: Brechenridge, R. G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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SHUTDOWN COOLING TEST. Pathfinder Atomic Power Plant Summary Report

Description: Tests are performed on Pathfinder superheat fuel element mockups, under reactor conditions of 600 psig, in order to determine the parameters influencing heat transfer from the fuel elements to the moderating water under shutdown conditions. The peak temperatures reached by the superheat elements are also found as functions of the heat generation rate. A mathematical model of the heat transfer system is developed. (T.F.H.)
Date: December 15, 1961
Creator: Littleton, W.E. & Ross, W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Annual Progress Report on Fuel Element Development for FY 1962

Description: Activities in a project aimed at the improvement of fuel elements for high flux test reactors are reported. The investigation of new fuel compositions, distributions, and geometries is being undertaken to increase fuel life, to improve the flux distribution, and to provide a means of safely reaching higher reactor operating power and power density in these reactors. The effects of nuclear irradiation on the fuel and structural materials is being studied to predict the performance of these mater… more
Date: August 15, 1962
Creator: Gibson, G. W. & Francis, W. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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High-temperature fuel cell research and development. Final technical status report, June 1977-September 1978

Description: An initial survey of the literature produced a list of ceramic materials with properties which made them potential candidates for use in molten-carbonate fuel cell tiles or electrodes. Seven of the materials in the original list were dropped from consideration because of unfavorable thermodynamic properties; four materials were set aside because of high cost, lack of availability, or fabrication difficulties. Thirteen compositions were tested statically at 1000 K in a Li/sub 2/CO/sub 3/-K/sub 2… more
Date: October 15, 1978
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Evaluation of MHD materials for use in high-temperature fuel cells

Description: The MHD and high-temperature fuel cell literature was surveyed for data pertaining to materials properties in order to identify materials used in MHD power generation which also might be suitable for component use in high-temperature fuel cells. Classes of MHD-electrode materials evaluated include carbides, nitrides, silicides, borides, composites, and oxides. Y/sub 2/O/sub 3/-stabilized ZrO/sub 2/ used as a reference point to evaluate materials for use in the solid-oxide fuel cell. Physical an… more
Date: June 15, 1978
Creator: Guidotti, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Enthalpy measurement of coal-derived liquids. Technical progress report, May-July 1981. [186 to 732/sup 0/F and 75, 100, and 200 psia]

Description: Enthalpy measurements were initiated on the model compound quinoline. Preliminary results are presented for the temperature region 186 to 732/sup 0/F along isobars of 75, 100, and 200 psia.
Date: July 15, 1981
Creator: Kidnay, A. J. & Yesavage, V. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Coal combustion aerothermochemistry research. Final report

Description: On the basis of extensive aerothermochemistry analyses, laboratory investigations, and combustor tests, significant headway has been made toward improving the understanding of combustion phenomena and scaling of high swirl pulverized coal combustors. A special attempt has been made to address the gap between scientific data available on combustion and hardware design and scaling needs. Both experimental and theoretical investigations were conducted to improve the predictive capability of combus… more
Date: December 15, 1980
Creator: Witte, A.B.; Gat, N.; Denison, M.R. & Cohen, L.M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Mechanical and transport properties of rocks at high temperatures and pressures. Task I, the physical nature of fracturing at depth. Technical progress report No. 1, 1 March 1980-30 November 1980

Description: Research progress is reported in the following areas: (1) the delineation of the boundary separating elastic-brittle and transient-1 semibrittle behavior of granite and of its volcanic and metamorphic equivalents, rhyolite and granite gneiss; (2) the variation of fracture permeability in Sioux Quartzite, Westerly Granite and a fine-1 grained gabbro as a function of effective pressure and hydrothermal alterations; and (3) determine the mechanical properties of selected rocks at high temperatures… more
Date: December 15, 1980
Creator: Carter, N. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Phase relations in crystalline ceramic nuclear waste forms the system UO/sub 2 + x/-CeO/sub 2/-ZrO/sub 2/-ThO/sub 2/ at 1200/sup 0/C in air

Description: Steady-state phase relations in the system UO/sub 2 + x/-CeO/sub 2/-ZrO/sub 2/-ThO/sub 2/ were determined for application to phase relations in the high-level crystalline ceramic nuclear waste form Supercalcine-Ceramics. Samples were treated at 1200/sup 0/C at an oxygen partial pressure of 0.21 atm and a total pressure of 1 atm. Phase assemblages were found to be composed of cubic solid solutions of the flourite structure type, solid solutions based on ZrO/sub 2/, and orthorhombic solid solutio… more
Date: February 15, 1981
Creator: Pepin, J.G. & McCarthy, G.J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Motion of particles in a thermal boundary layer

Description: In the course of using laser Doppler velocimetry to study combustion in a thermal boundary layer, the particle count rate was found to decrease abruptly to zero inside the boundary layer. Experimental and theoretical investigation of this phenomenon was carried out. The motion of the particles may be due to the combined effects of thermophoresis and radiative heating.
Date: June 15, 1978
Creator: Schefer, R.W.; Agrawal, Y.; Cheng, R.K.; Robben, F. & Talbot, L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Basic Combustion and Pollutant-Formation Processes for Pulverized Fuels. Quarterly Technical Progress Report No. 1, 1 October 1980-31 December 1980

Description: A study of basic combustion and pollutant formation processes for pulverized solid fossil fuels has been initiated. The solid fossil fuels under consideration for this research include such solid fuels as non-bituminous coal types, solvent refined coal, combustion char, petroleum coke, oil shale and tar sand. The potential industrial application of pulverized fuels other than coal provides some promise for relief from present and future conventional fuel shortages. Utilization problems with the… more
Date: January 15, 1981
Creator: Germane, Geoffery J. & Smoot, L. Douglas
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Variation of the yield strength and strain-rate sensitivity exponent of type 21-6-9 stainless steel over a wide temperature range

Description: The yield strength of solution-annealed 21-6-9 austenitic stainless steel was determined over a wider temperature range (-195 to 1100/sup 0/C) than has been previously reported. The most noteworthy characteristic of the variation of yield stress with temperature was the dramatic decrease in yield strength from -195/sup 0/C to 300/sup 0/C. The strain-rate sensitivity exponent, N, was determined using strain-rate change tests. A plot of N vs temperature showed that n dramatically increased at abo… more
Date: November 15, 1982
Creator: Kassner, M.E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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High-temperature oxidation of ion-implanted tantalum. [At 500 and 1000/sup 0/C]

Description: The oxidation of ion-implanted Ta in two different high temperature regimes has been studied. Oxidations were carried out at 500/sup 0/C in Ar/O/sub 2/ mixtures, where oxide growth is known to follow a parabolic rate law in initial stages, and at 1000/sup 0/C in pure O/sub 2/, where a linear-rate behavior obtains. Implanted species include Al, Ce, Cr, Li, Si and Zr at fluences of the order of 10/sup 17//cm/sup 2/. Oxidized samples were studied using Rutherford backscattering, nuclear reaction a… more
Date: September 15, 1982
Creator: Kaufmann, E. N.; Musket, R. G.; Truhan, J. J.; Grabowski, K. S.; Singer, I. L. & Gossett, C. R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Summary report of the compressive creep properties of irradiated and unirradiated molybdenum. [Fast neutrons]

Description: Compressive creep tests were performed on molybenum samples exposed to four different pre-test conditions: (1) annealed; (2) annealed and neutron irradiated at 480/sup 0/C to a fluence of 5 x 10/sup 19/ n cm/sup -2/ (E > 1 MeV); (3) stress-relieved; and (4) stress-relieved and neutron irradiated at reactor ambient temperature to a fluence of 1 x 10/sup 19/ n cm/sup -2/ (E > 1 MeV). The tests were performed in the temperature range of 600 to 900/sup 0/C with an initial applied stress of 176.5 MP… more
Date: April 15, 1977
Creator: Zielinski, R. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Temperature Distributions in Electron Beam Welding Cavities

Description: Surface temperatures in electron beam welding cavities in stainless steel 304 and aluminum 1100, 2024, and 6061 were measured with a narrow band infrared radiation pyrometer. A special device was designed for mounting the radiation-sensing probe next to the electron beam gun in the welding chamber. This mounting device included a mechanism for oscillating the probe so as to scan the cavity region both perpendicular and parallel to the welding direction. At the center of its movement the probe v… more
Date: July 15, 1976
Creator: Shintaku, S. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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FHR Generic Design Criteria

Description: The purpose of this document is to provide an initial, focused reference to the safety characteristics of and a licensing approach for Fluoride-Salt-Cooled High-Temperature Reactors (FHRs). The document does not contain details of particular reactor designs nor does it attempt to identify or classify either design basis or beyond design basis accidents. Further, this document is an initial attempt by a small set of subject matter experts to document the safety and licensing characteristics of F… more
Date: June 15, 2012
Creator: Flanagan, G. F.; Holcomb, D. E. & Cetiner, S. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Application of Spatially Resolved High Resolution Crystal Spectrometry to ICF Plasmas

Description: High resolution (λ/Δ#3;λ ~ 10 000) 1D imaging x-ray spectroscopy using a spherically bent crystal and a 2D hybrid pixel array detector is used world wide for Doppler measurements of ion-temperature and plasma flow-velocity profiles in magnetic confinement fusion plasmas. Meter sized plasmas are diagnosed with cm spatial resolution and 10 ms time resolution. This concept can also be used as a diagnostic of small sources, such as inertial confinement fusion plasmas and targets on x-ray light sour… more
Date: September 15, 2012
Creator: Hill, Kenneth W.; Bitter, M.; Delgado-Aprico, L.; Pablant, N. A.; Beirersdorfer, P.; Schneider, M. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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