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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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Deformation and Fracture Map Methodology for Predicting Cladding Behavior During Dry Storage

Description: The licensing of interim dry storage of light-water reactor spent fuel requires assurance that release limits of radioactive materials are not exceeded. The extent to which Zircaloy cladding can be relied upon as a barrier to prevent release of radioactive spent fuel and fission products depends upon its integrity. The internal pressure from helium and fission gases could become a source of hoop stress for creep rupture if pressures and temperatures were sufficiently high. Consequently, it is o… more
Date: September 1, 1986
Creator: Chin, B. A.; Khan, M. A. & Tarn, J. C. L.
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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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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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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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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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

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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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

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
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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
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High Temperature Materials Technology Research for Advanced Thermionic Systems. Quarterly Progress Report, October 1, 1993--December 31, 1993

Description: The effort was concentrated on two aspects of modeling of deformation in refractory alloy single crystals: deformation map in a tube with a [111] axial orientation and creep retardation due to solution strengthening (both effects are important in bcc single crystalline refractory alloys for high temperature emitters). Lattice misfit parameters are given between tungsten and 3 solutes (Re, Nb, Hf). 3 figs, 10 refs, 1 tab.
Date: December 31, 1993
Creator: Zee, R. H. & Rose, M. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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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
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High Temperature Materials Technology Research for Advanced Thermionic Systems. Quarterly Progress Report, Period Ending March 31, 1993

Description: Effort was concentrated on modeling the deformation process in refractory alloy single crystals and the stress distribution in metal- ceramic-metal long trilayer insulators. Resolved shear stress distributions are given for a bcc Mo single crystal tube with a [110] growth direction. Effect of 1.8% Nb additions on creep of Mo single crystals was studied, simulating the cylindrical configuration of the TFE emitter. In the area of advanced sheath trilayer insulators, radiation-induced stresses in … more
Date: August 1, 1993
Creator: Zee, R. H. & Rose, M. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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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
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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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High Temperature Materials Technology Research for Advanced Thermionic Systems. Quarterly Progress Report for Period Ending September 30, 1993

Description: Objective was to understand the strengthening mechanisms in advanced refractory alloys for high-temperature thermionic applications. During the first 6 months, the role of substitutional solutes in refractory alloy single crystals was identified and modeled using a simple size misfit factor as the governing parameter. During the past period, effort was concentrated on the strengthening effects in various refractory structures and the growth of refractory alloy single crystals. 11 figs, 4 tabs.
Date: December 31, 1993
Creator: Zee, R. H. & Rose, M. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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FINAL TECHNICAL REPORT: Request for support of the 11th Workshop on the Physics of Dusty Plasmas

Description: This grant supported the publication of student papers that were presented at the 11th Workshop on the Physics of Dusty Plasmas. Papers were published in a Special Issue of the IEEE Transactions on Plasma Science, Vol. 32, Issue 2 in April, 2007.
Date: May 21, 2009
Creator: Thomas, Edward
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

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
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