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Removal of radioisotopes from the Columbia River by natural processes

Description: Some radioisotopes are introduced into the Columbia River by return of the water used to cool the Hanford reactors. Trace amounts of both fission product and activation product radioisotopes are present and measurable by sensitive radiochemical methods to allow determination of the self-purification processes occurring as the water moves downstream. By comparing the radioisotope input at given times with the amounts present in the river after traveling downstream, a measure of the self-purifica… more
Date: April 10, 1962
Creator: Nielsen, J. M. & Perkins, R. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Anodic Behavior of SAM2X5 Material Applied as Amorphous Coatings

Description: Iron-based amorphous alloys are desirable industrial materials since they are highly resistant to corrosion and possess enhanced hardness for wear resistance. The amorphous materials can be produced from the melt as powder and later spray deposited as coatings on large engineering structures. As a laboratory experiment, SAM2X5 powder was coated on electrochemical specimens of 304SS for testing. Results show that the coated specimens did not perform satisfactorily during the laboratory testing. … more
Date: August 10, 2007
Creator: Hailey, P D; Farmer, J C; Day, S D & Rebak, R B
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Growth and Printability of Multilayer Phase Defects on EUV MaskBlanks

Description: The ability to fabricate defect-free mask blanks is a well-recognized challenge in enabling extreme ultraviolet lithography (EUVL) for semiconductor manufacturing. Both the specification and reduction of defects necessitate the understanding of their printability and how they are generated and grow during Mo-Si multilayer (ML) deposition. A ML phase defect can be depicted by its topographical profile on the surface as either a bump or pit, which is then characterized by height or depth and widt… more
Date: June 10, 2007
Creator: Liang, Ted; Ultanir, Erdem; Zhnag, Guojing; Park, Seh-Jin; Anderson, Erik; Gullikson, Eric et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Spatial distribution of average charge state and deposition rate in high power impulse magnetron sputtering of copper

Description: The spatial distribution of copper ions and atoms in high power impulse magnetron sputtering (HIPIMS) discharges was determined by (i) measuring the ion current to electrostatic probes and (ii) measuring the film thickness by profilometry. A set of electrostatic and collection probes were placed at different angular positions and distances from the target surface. The angular distribution of the deposition rate and the average charge state of the copper species (including ions and neutrals) wer… more
Date: May 10, 2008
Creator: Anders, Andre; Horwat, David & Anders, Andre
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Effect of several surface treatments on the strength of a glass ceramic-to-metal seal

Description: Test shells of Inconel 625, Inconel 718, 21-6-9 stainless steel, and Hastelloy, C-276 were plasma and/or chemically cleaned before sealing with a multi-component glass-ceramic-to-metal seal was evaluated using a hydrostatic burst test. The results show that plasma cleaning can be used to increase the hydrostatic burst strength and hermeticity of a glass ceramic-to-metal seal.
Date: February 10, 1982
Creator: Kramer, D P; Salerno, R F & Egleston, E E
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Deactivation by Carbon of Iron Catalysts for Indirect Liquefaction

Description: Although promoted cobalt and iron catalysts for Fischer-Tropsch (FT) synthesis of gasoline feedstock were first developed more than three decades ago, a major technical problem still limiting the commercial use of these catalysts today is carbon deactivation. This report describes recent progress in a fundamental, three-year investigation of carbon formation and its effects on the activity and selectivity of promoted iron catalysts for FT synthesis, the objectives of which are to: determine rat… more
Date: January 10, 1991
Creator: Bartholomew, C. H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Investigation of PACVD protective coating processes using advanced diagnostics techniques

Description: Coherent anti-Stokes Raman Spectroscopy (CARS) is used to study the plasma-assisted chemical vapor deposition (PACVD) of TiB{sub 2}. CARS is applied to the dominent species in an inductively coupled B{sub 2}H{sub 6}/Ar rf plasma. Axial concentration profiles of diborane and hydrogen are probed in the plasma. A five-step mechanism is developed. Photochemical initiation of the chemical reaction is considered. 16 refs, 5 figs.(DLC)
Date: July 10, 1992
Creator: Roman, W.C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Sputter Deposition of Porous Nanostructured Metals and Nanostructured Membranes for Catalysis

Description: The sputter deposition process can be used to create nanostructured materials that possess continuous open porosity. Characterization of sputter deposited metals and metal-oxide coatings are presented.
Date: September 10, 2003
Creator: Jankowski, Alan Frederic; Ferreira, J. L. & Hayes, Jeffrey P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Estimation of aerosol plutonium transport by the dust-flux method: a perspective on application of detailed data

Description: Two methods of dust-flux measurements are discussed which have been utilized to estimate aerosol plutonium deposition and resuspension. In previous studies the methods were found to be sufficiently detailed to permit parameterization of dust-flux to the erodibility of the soil, and a seventh-power dependency of dust-flux (or plutonium flux) to wind speed was observed in worst case conditions. The eddy-correlation method is technically more difficult, requires high-speed data acquisition, and re… more
Date: December 10, 1976
Creator: Shinn, Joseph H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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A COMPREHENSIVE ANALYSIS OF CHLORINE TRANSPORT AND FATE FOLLOWING A LARGE ENVIRONMENTAL RELEASE

Description: A train derailment occurred in Graniteville, South Carolina during the early morning of January 6, 2005, and resulted in the release of a large amount of cryogenic pressurized liquid chlorine to the environment in a short time period. A comprehensive evaluation of the transport and fate of the released chlorine was performed, accounting for dilution, diffusion, transport and deposition into the local environment. This involved the characterization of a three-phased chlorine release, a detailed … more
Date: May 10, 2011
Creator: Buckley, R.; Hunter, C.; Werth, D.; Chen, K.; Whiteside, M. & Mazzola, C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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A Study of Advanced Materials for Gas Turbine Coatings at Elevated Temperatures Using Selected Microstructures and Characteristic Environments for Syngas Combustion

Description: Thermal barrier coatings (TBCs) that can be suitable for use in industrial gas turbine engines have been processed and compared with electron beam physical vapor deposition (EBPVD) microstructures for applications in advanced gas turbines that use coal-derived synthesis gas. Thermo-physical properties have been evaluated of the processed air plasma sprayed TBCs with standard APS-STD and vertically cracked APS-VC coatings samples up to 1300 C. Porosity of these selected coatings with related mic… more
Date: February 10, 2011
Creator: Diwan, Ravinder; Mensah, Patrick; Li, Guoqiang; Uppu, Nalini; Akwaboa, Strphen; Silva, Monica et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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SIMULATION OF THE ICELAND VOLCANIC ERUPTION OF APRIL 2010 USING THE ENSEMBLE SYSTEM

Description: The Eyjafjallajokull volcanic eruption in Iceland in April 2010 disrupted transportation in Europe which ultimately affected travel plans for many on a global basis. The Volcanic Ash Advisory Centre (VAAC) is responsible for providing guidance to the aviation industry of the transport of volcanic ash clouds. There are nine such centers located globally, and the London branch (headed by the United Kingdom Meteorological Office, or UKMet) was responsible for modeling the Iceland volcano. The guid… more
Date: May 10, 2011
Creator: Buckley, R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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ACTUAL-WASTE TESTING OF ULTRAVIOLET LIGHT TO AUGMENT THE ENHANCED CHEMICAL CLEANING OF SRS SLUDGE

Description: In support of Savannah River Site (SRS) tank closure efforts, the Savannah River National Laboratory (SRNL) conducted Real Waste Testing (RWT) to evaluate Enhanced Chemical Cleaning (ECC), an alternative to the baseline 8 wt% oxalic acid (OA) chemical cleaning technology for tank sludge heel removal. ECC utilizes a more dilute OA solution (2 wt%) and an oxalate destruction technology using ozonolysis with or without the application of ultraviolet (UV) light. SRNL conducted tests of the ECC proc… more
Date: July 10, 2012
Creator: Martino, C.; King, W. & Ketusky, E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Actinic characterization of EUV bump-type phase defects

Description: Despite tremendous progress and learning with EUV lithography, quantitative experimental information about the severity of point-like phase defects remains in short supply. We present a study of measured, EUV aerial images from a series of well-characterized, open-field, bump-type programmed phase defects, created on a substrate before multilayer deposition.
Date: January 10, 2011
Creator: Goldberg, Kenneth A.; Mochi, Iacopo & Liang, Ted
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Boundary-layer control for reducing deposition of solids at a geothermal nozzle wall

Description: Deposition of solids at the wall of a nozzle used to expand geothermal brine may be accounted for by a hydrodynamic model describing eddy formation near the wall. A conceptual design of a nozzle with injection of an annular ring of fluid at the wall is presented.
Date: June 10, 1976
Creator: Homsy, Robert V.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Morphological aspects of surface reactions. Progress report, March 1993--March 1994

Description: This work focuses on substrate morphology and on fragments synthesized by thermal, electron, and photon activation. The following work is complete: (1) Low energy electron diffraction, Auger electron spectroscopy and scanning tunneling microscopy were used to determine the local morphology of rhodium films on titania. (2) A new tool was developed for diagnosing surface reactions that involve C-H bond cleavage -- predosed oxygen TPD (POTPD), a technique based on scavenging surface H(a) by small … more
Date: January 10, 1994
Creator: White, J. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The significance of the erosion-induced terrestrial carbonsink

Description: Estimating carbon (C) balance in erosional and depositionallandscapes is complicated by the effects of soil redistribution on bothnet primary productivity (NPP) and decomposition. Recent studies arecontradictory as to whether soil erosion does or does not constitute a Csink. Here we clarify the conceptual basis for how erosion can constitutea C sink. Specifically, the criterion for an erosional C sink is thatdynamic replacement of eroded C, and reduced decomposition rates indepositional sites, … more
Date: October 10, 2006
Creator: Berhe, A.A.; Harte, J.; Harden, J.W. & Torn, M.S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Mo-containing tetrahedral amorphous carbon deposited by dualfiltered cathodic vacuum arc with selective pulsed bias voltage

Description: Metal-containing tetrahedral amorphous carbon films were produced by dual filtered cathodic vacuum arc (FCVA) plasma sources operated in sequential pulsed mode. A negatively pulsed bias was applied to the substrate only when carbon plasma was generated. Films thickness was measured after deposition by profilometry. Glass slides with silver pads were used as substrate for the of the measurement sheet resistance. The microstructure and composition of the films were characterized by Raman spectros… more
Date: September 10, 2006
Creator: Pasaja, Nitisak; Sansongsiri, Sakon; Anders, Andre; Vilaithong,Thiraphat & Intasiri, Sawate
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Smoothing of ultrathin silver films by transition metalseeding

Description: The nucleation and coalescence of silver islands on coated glass was investigated by in-situ measurements of the sheet resistance. Sub-monolayer amounts of transition metals (Nb, Ti, Ni, Cr, Zr, Ta, and Mo) were deposited prior to the deposition of silver. It was found that some, but not all, of the transition metals lead to coalescence of silver at nominally thinner films with smoother topology. The smoothing effect of the transition metal at sub-monolayer thickness can be explained by a therm… more
Date: February 10, 2006
Creator: Anders, Andre; Byon, Eungsun; Kim, Dong-Ho; Fukuda, Kentaro & Lim,Sunnie H.N.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Electron Beam-induced Light Emission and Transport in GaN Nanowires

Description: We report observations of electron beam-induced light from GaN nanowires grown by chemical vapor deposition. GaN nanowires were modified in-situ with deposited opaque platinum coatings to estimate the extent to which light is channeled to the ends of nanowires. Some evidence of light channeling was found, but wire microstructure and defects play an important role in light scattering and transport, limiting the extent to which light is confined. Optical interconnects are powerful components pres… more
Date: May 10, 2006
Creator: Tringe, J W; MoberlyChan, W J; Stevens, C G; Davydov, A V & Motayed, A
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Improved Radiation Dosimetry/Risk Estimates to Facilitate Environmental Management of Plutonium Contaminated Sites

Description: Our phase-II research relates to evaluating health risks associated with inhaled plutonium (Pu). Our current research objectives are as follows: (1) to extend our stochastic model for deposition of plutonium (Pu) in the respiratory tract to include additional key variability and uncertainty; (2) to generate and analyze risk distributions for deterministic effects in the lung from inhaled Pu that reflect risk model uncertainty; (3) to acquire an improved understanding of key physiological effect… more
Date: July 10, 2002
Creator: Scott, Bobby R.; Cheng, Yung-Sung; Zhou, Yue; Tokarskaya, Zoya B. & Zhuntova, Galina V.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Calcite Fluid Inclusion, Paragenetic, and Oxygen Isotopic Records of Thermal Event(s) at Yucca Mountain, Nevada

Description: Yucca Mountain, Nevada, is under consideration as a potential high-level radioactive waste repository situated above the water table in 12.7 Ma tuffs. A wealth of textural and geochemical evidence from low-temperature deposits of calcite and silica, indicates that their genesis is related to unsaturated zone (UZ) percolation and that the level of the potential repository has never been saturated. Nonetheless, some scientists contend that thermal waters have periodically risen to the surface dep… more
Date: August 10, 2000
Creator: Peterman, B. & Moscati, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Copper Wetting of x-Al(2)O(3)(0001): Theory and Experiment

Description: XPS studies have been carried out on sputter deposited copper on a substantially hydroxylated {alpha}-Al{sub 2}O{sub 3}(0001) (sapphire) surface under ultra-high vacuum (UHV) conditions. XPS-derived Cu uptake curves show a sharp change in slope at a coverage of 0.35 monolayer (on a Cu/O atomic basis), indicative of initial layer-by-layer growth. CU(LMM) lineshape data indicate that, prior to the first break in the curve, Cu is oxidized to Cu(I). At higher coverages, metallic CU(0) is. observed.… more
Date: August 10, 1999
Creator: Bogicevic, A.; Jennison, D. R.; Kelber, J. A.; Niu, Chengyu & Shepherd, K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Impermeable Thin Al2O3 Overlay for TBC Protection From Sulfate and Vanadate Attack in Gas Turbines Quarterly Report

Description: In order to improve the hot corrosion resistance of yttria-stabilized zirconia (YSZ), an Al{sub 2}O{sub 3} overlay has been deposited on the surface of YSZ by electron-beam physical vapor deposition. Currently, hot corrosion tests were performed on the YSZ coatings with and without Al{sub 2}O{sub 3} overlay in molten salt mixture (Na{sub 2}SO{sub 4} + 0 {approx} 15wt%V{sub 2}O{sub 5}) at 950 C in order to investigate the effect of amount of vanadate on the hot corrosion behaviors. The results s… more
Date: June 10, 2003
Creator: Mao, Scott X.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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