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Helium induced degradation in the weldability of an austenitic stainless steel

Description: Autogenous gas tungsten arc welding was performed on He-doped type 316 stainless steel. Helium was uniformly implanted in the material using the ''tritium trick'' to levels of 27 and 105 appm. Severe intergranular cracking occurred in both fusion and heat-affected zones. Microstructural observations of fusion zone indicated that the pore size, degree of porosity, and tendency to form cracks increased with increasing helium concentration. Scanning electron microscopy showed that cracking in He-d… more
Date: January 1, 1988
Creator: Lin, H. T.; Goods, S. H.; Grossbeck, M. L. & Chinl, B. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Final Report for Fractionation and Separation of Polydisperse Nanoparticles into Distinct Monodisperse Fractions Using CO2 Expanded Liquids

Description: The overall objective of this project was to facilitate efficient fractionation and separation of polydisperse metal nanoparticle populations into distinct monodisperse fractions using the tunable solvent properties of gas expanded liquids. Specifically, the dispersibility of ligand-stabilized nanoparticles in an organic solution was controlled by altering the ligand-solvent interaction (solvation) by the addition of carbon dioxide (CO{sub 2}) gas as an antisolvent (thereby tailoring the bulk s… more
Date: August 31, 2007
Creator: Roberts, Chistopher
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Propagation and Mode Conversion for Waves in Nonuniform Plasmas

Description: The following topics are described: (1) the hybrid resonance, (2) Alfven resonance, (3) the intermediate-frequency electromagnetic wave equation, (4) the standard equation, (5) the tunneling equation, (6) asymptotic solutions of the tunneling equation, (7) localized absorption, and (8) matched asymptotic expansions; the low-frequency Alfven resonance. (MOW)
Date: June 1, 1982
Creator: Stix, T. H. & Swanson, D. G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Low Aspect Ratio Torsatrons

Description: This paper discusses a move toward a more compact stellarator that could be a more attractive fusion reactor.
Date: January 1, 1987
Creator: Carreras, B. A.; Dominguez, N.; Garcia, L.; Lynch, V. E.; Lyon, J. F.; Cary, J. R. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Stable Crack Growth Estimates Based on Effective Crack Length and Crack-Opening Displacements

Description: A method was developed for estimating the amount of stable crack growth that has occurred in a fracture toughness specimen that were loaded into the plastic range and for which only a monotonically increasing load-displacement curve was measured. The method was applied to data from several pressure vessel steels. The resulting J vs ..delta..a values compare favorably with a resistance curve obtained by the multiple specimen heat-tinting technique for A533, Grade B, Class 1 steel. The method for… more
Date: January 1, 1979
Creator: Merkle, J. G. & Hudson, C. E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Role of Non-Ferrous Coal Minerals and by-Product Metallic Wastes in Coal Liquefaction. Technical Progress Report, June 1, 1980-August 31, 1980

Description: Additional data on the pyrite catalysis of liquefaction of Elkhorn number 3 coal are presented. The liquefaction of Elkhorn number 3 coal was significantly catalyzed by the presence of pyrite. Coal conversion, oil yield and preasphaltene conversion all increased when pyrite was added. An increase in hydrocarbon gas make accompanied by a higher hydrogen consumption were also observed. The higher activity in the presence of pyrite could be utilized by running the liquefaction step at milder condi… more
Date: September 1, 1980
Creator: Garg, D.; Givens, E. N.; Schweighardt, F. K.; Clinton, J. H.; Tarrer, A. R.; Guin, J. A. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Helium-Induced Weld Degradation of HT-9 Steel

Description: Helium-bearing Sandvik HT-9 ferritic steel was tested for weldability to simulate the welding of structural components of a fusion reactor after irradiation. Helium was introduced into HT-9 steel to 0.3 and 1 atomic parts per million (appm) by tritium doping and decay. Autogenous single pass full penetration welds were produced using the gas tungsten arc (GTA) welding process under laterally constrained conditions. Macroscopic examination showed no sign of any weld defect in HT-9 steel containi… more
Date: December 31, 1992
Creator: Wang, Chin-An; Chin, B. A.; Lin, Hua T. & Grossbeck, M. L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Effect of SOFC Interconnect-Coating Interactions on Coating Properties and Performance

Description: The high operating temperature of solid oxide fuel cells (SOFCs) provides good fuel flexibility which expands potential applications, but also creates materials challenges. One such challenge is the interconnect material, which was the focus of this project. In particular, the objective of the project was to understand the interaction between the interconnect alloy and ceramic coatings which are needed to minimize chromium volatilization and the associated chromium poisoning of the SOFC cathode… more
Date: September 5, 2012
Creator: Fergus, Jeffrey W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Collaborative Research: Experimental and Theoretical Study of the Plasma Physics of Antihydrogen Generation and Trapping

Description: Ever since Dirac predicted the existence of antimatter in 1928, it has excited our collective imagination. Seventy-four years later, two collaborations at CERN, ATHENA and ATRAP, created the first slow antihydrogen. This was a stunning achievement, but the most important antimatter experiments require trapped, not just slow, antihydrogen. The velocity, magnetic moment, and internal energy and state of the antihydrogen depend strongly on how it is formed. To trap antihydrogen, physicists face tw… more
Date: March 29, 2013
Creator: Robicheaux, Francis
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

TOWARD AN IMPROVED UNDERSTANDING OF STRUCTURE AND MAGNETISM IN NEPTUNIUM AND PLUTONIUM PHOSPHONATES AND SULFONATES

Description: This grant supported the exploratory synthesis of new actinide materials with all of the actinides from thorium to californium with the exceptions of protactinium and berkelium. We developed detailed structure-property relationships that allowed for the identification of novel materials with selective ion-exchange, selective oxidation, and long-range magnetic ordering. We found novel bonding motifs and identified periodic trends across the actinide series. We identified structural building unit… more
Date: March 1, 2012
Creator: Albrecht-Schmitt, Thomas
Item Type: Refine your search to only Text
Partner: UNT Libraries Government Documents Department
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Gyrokinetic Electron and Fully Kinetic Ion Particle Simulation of Collisionless Plasma Dynamics

Description: Fully kinetic-particle simulations and hybrid simulations have been utilized for decades to investigate various fundamental plasma processes, such as magnetic reconnection, fast compressional waves, and wave-particle interaction. Nevertheless, due to disparate temporal and spatial scales between electrons and ions, existing fully kinetic-particle codes have to employ either unrealistically high electron-to-ion mass ratio, me/mi, or simulation domain limited to a few or a few ten's of the ion La… more
Date: August 11, 2009
Creator: Lin, Yu; Wang, Xueyi; Chen, Liu & Lin, Zhihong
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Quasi-Toroidal Stellarator: An Innovative Confinement Experiment

Description: To develop a new class of stellarators that exhibit improved confinement compared to conventional stellarators. This approach generally makes use of a designed symmetry of the magnetic field strength along a particular coordinate axis in the toroidal geometry of the stellarator, and is referred to as quasi-symmetry.
Date: April 1, 2001
Creator: Knowlton, S. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Evaluation of Coal Minerals and Metal Residues as Coal-Liquefaction Catalysts. Final Report

Description: The catalytic activity of various minerals, metallic wastes, and transition metals was investigated in the liquefaction of various coals. The effects of coal type, process variables, coal cleaning, catalyst addition mode, solvent quality, and solvent modification on coal conversion and oil production were also studied. Coal conversion and oil production improved significantly by the addition of pyrite, reduced pyrite, speculite, red mud, flue dust, zinc sulfide, and various transition metal com… more
Date: February 1, 1982
Creator: Garg, D.; Givens, E. N.; Schweighardt, F. K.; Tarrer, A. R.; Guin, J. A.; Curtis, C. W. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Solvent Tailoring in Coal Liquefaction. Quarterly Report, August 1982-November 1982

Description: A gradientless, high-pressure, continuous reaction system equipped with a carberry-type catalyst basket, was designed and built for hydrotreating liquid feedstocks. A model reaction system (naphthalene dissolved in a carrier vehicle) was used to verify the key results of the simulation study. Investigation of the sensitivity of hydrotreater performance to variations in the volatility of the feedstream were continued. Hydrogenation activity was found to be highly sensitive to differences in the … more
Date: January 1, 1982
Creator: Tarrer, A. R.; Guin, J. A.; Curtis, C. W. & Williams, D. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Solvent Tailoring in Coal Liquefaction. Quarterly Report, February 1982-May 1982. [In Many Cases the Simple Organic Compounds Listed Were Hydrogenated]

Description: Twenty-three model donor solvents were used to rank their efficacy for the dissolution of Western Kentucky No. 9/14 coal. The transfer of hydrogen from the solvent to the coal fragments, as measured by coal conversion, was examined at three levels of available hydrogen. The hydrogen donors are ranked according to their ability to convert coal to THF solubles. Aromatic analogs of the model donors showed little ability to convert coal to THF solubles. Factors which influence hydrogen donation inc… more
Date: January 1, 1982
Creator: Tarrer, A. R.; Guin, J. A.; Curtis, C. W. & Williams, D. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Solvent Tailoring in Coal Liquefaction. Quarterly Report, May 1982-August 1982. [Comparison of Subcritical and Supercritical Conditions]

Description: The initial objective of this work was to study the phase distribution of donor solvents and solvent mixtures during the liquefaction of coal, to investigate the effects of phase distribution on coal conversion, and to determine the advantages, if any, of operating at subcritical and/or supercritical conditions. Computer simulations were used to predict the phase distribution, for various binary systems, as a function of temperature. The FLASH program was used to theoretically predict phase dis… more
Date: January 1, 1982
Creator: Tarrer, A. R.; Guin, J. A.; Curtis, C. W. & Williams, D. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Solvent Tailoring in Coal Liquefaction. Quarterly Report, April-June 1984

Description: Although the numerous functions of the solvent during liquefaction are not completely understood, the provision for (and the maintenance of) an effective process solvent is necessary for effective coal liquefaction. In this project, the function of the process solvent regarding vapor-liquid equilibrium, hydrogen donation, and catalyst activity has been explored. In previously reported work, a number of donor compounds were evaluated for their relative efficiency in converting coal to cresol sol… more
Date: July 1, 1984
Creator: Tarrer, A. R.; Curtis, C. W.; Guin, J. A. & Williams, D. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Role of Non-Ferrous Coal Minerals and by-Product Metallic Wastes in Coal Liquefaction. Technical Progress Report, 1 March 1980-31 May 1980

Description: This report describes work done in a study of the role of coal minerals and by-product metallic wastes in coal liquefaction. The thermal behavior of various minerals and metallic by-product wastes was evaluated by thermal gravimetric analysis and differential thermal analysis in the presence of hydrogen, nitrogen, and air. The CPDU was operated for 220 hours to obtain baseline data and provide information on the catalytic activity of Robena pyrite in solvent hydrogenation and coal liquefaction.… more
Date: June 1, 1980
Creator: Garg, D.; Schweighardt, F. K.; Givens, E. N.; Clinton, J. H.; Tarrer, A. R.; Guin, J. A. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Electron-Impact Ionization Data for the Fe Isonuclear Sequence

Description: Atomic data for the electron-impact ionization of ions in the Fe isonuclear sequence is reviewed. The best available data are identified. Comments are made on current research activities leading to future data for Fe ions. 23 refs., 29 figs., 12 tabs.
Date: November 25, 1986
Creator: Pindzola, M. S.; Griffin, D. C.; Bottcher, C.; Younger, S. M. & Hunter, H. T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Alternative Fuel for Portland Cement Processing

Description: The production of cement involves a combination of numerous raw materials, strictly monitored system processes, and temperatures on the order of 1500 °C. Immense quantities of fuel are required for the production of cement. Traditionally, energy from fossil fuels was solely relied upon for the production of cement. The overarching project objective is to evaluate the use of alternative fuels to lessen the dependence on non-renewable resources to produce portland cement. The key objective of us… more
Date: June 30, 2012
Creator: Schindler, Anton K.; Duke, Steve R.; Burch, Thomas E.; Davis, Edward W.; Zee, Ralph H.; Bransby, David I. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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