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PASSIVITY BREAKDOWN AND EVOLUTION OF LOCALIZED CORROSION ON TYPE 316L STAINLESS STEEL

Description: Passivity breakdown of 316L SS in the presence of aggressive Cl{sup -} and inhibitive NO{sub 3}{sup -} anions has been experimentally studied and the results have been interpreted in terms of the Point Defect Model (PDM). By introducing the competitive adsorption of Cl{sup -} and NO{sub 3}{sup -} into surface oxygen vacancies at the passive film/solution interface, the PDM yields a critical breakdown potential (V{sub c}) that is predicted to vary linearly with log[Cl{sup -}], or with log ([Cl{s… more
Date: October 23, 2006
Creator: S. Yang, G. Engelhardt, and D. D. Macdonald
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Non-additive sputtering of niobium and tantalum as large neutral and ion clusters.

Description: An analysis of available literature data on both the positive ion emission from Nb and Ta bombarded by 6 keV/atom Au{sub m}{sup -} atomic and molecular ions (m=1, 2, 3) and positive ionization probabilities of Nb{sub n} and Ta{sub n} neutral clusters sputtered from the same metals by 5 keV Ar{sup +} ions have been conducted. Dependencies of cluster yields Y{sub n,m} (regardless of a charge state) on number of atoms n in a sputtered particle were found to follow a power law as Y{sub n,m} {approx… more
Date: September 23, 2002
Creator: Belykh, S. F.; Palitsin, V. V.; Veryovkin, I. V.; Adriaens, A. & Adams, F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Characterization and Performance of Fluidized Bed Steam Reforming (FBSR) Product as a Final Waste Form

Description: A demonstration of Fluidized Bed Steam Reforming (FBSR) was recently completed on a Hanford Low Activity Waste (LAW) simulant. This technology produced stable mineral phases (feldspathoids) when co-fired with clay. The mineral phases are cage structured and were determined to retain anions as well as cations such as Re (simulant for Tc) in the mineral cages. The FBSR mineral waste form exhibited incongruent leaching characteristics during Product Consistency Testing (PCT or ASTM C1285). FBSR mi… more
Date: October 23, 2003
Creator: Jantzen, Carol M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Laboratory Investigation of Electro-Osmotic Remediation of Fine-Grained Sediments

Description: Electro-osmosis, a coupled-flow phenomenon in which an applied electrical potential gradient drives water flow, may be used to induce water flow through fine-grained sediments. We plan to use this technology to remediate chlorinated solvent-contaminated clayey zones at the LLNL site. The electro-osmotic conductivity (k{sub e}) determined from bench-top studies for a core extracted from a sediment zone 36.4-36.6 m below surface was initially 7.37 x 10{sup -10} m{sup 2}/s-V, decreasing to 3.44 x … more
Date: February 23, 2000
Creator: Cherepy, N.; Wildenschild, D. & Elsholz, A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Toward crystal design in organic conductors and superconductors.

Description: We have seen that many different types of intermolecular interactions in organic conducting cation radical salts. Hydrogen bonding between the donor molecules and the anions is weak but not negligible. The ionic Madelung energy is insufficient to completely intersperse anions and cations, thus the layers favored by the van der Waals interactions remain intact. The search for new conducting and superconducting salts has been mainly by trial-and-error methods, even though simple substitutions hav… more
Date: April 23, 1999
Creator: Geiser, U.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Gas Ionization by Beam Electron Collisions and by Electron Avalanching in the Self Ez Field of a 2 kA Relativistic Electron Beam Focused on a Conducting Target

Description: About 1.5 x 10{sup 12} positive ions are predicted to be required to disrupt the focusing (for 0.25 cm radius and 0.2 electric neutralization fraction). Beam electron collisions are predicted to produce this number in 20 ns with 6 x 10{sup 15} water molecules/cm{sup 2}. Electron avalanching is predicted to be intense at time zero in a gas layer about 10{sup -3} cm thick with 1.4 x 10{sup 16} cm{sup -2}. With increasing time, space charge reduces the E-field and so the avalanching decreases. Wit… more
Date: May 23, 2003
Creator: Lauer, E
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

HF-based etching processes for improving laser damage resistance of fused silica optical surfaces

Description: The effect of various HF-based etching processes on the laser damage resistance of scratched fused silica surfaces has been investigated. Conventionally polished and subsequently scratched fused silica plates were treated by submerging in various HF-based etchants (HF or NH{sub 4}F:HF at various ratios and concentrations) under different process conditions (e.g., agitation frequencies, etch times, rinse conditions, and environmental cleanliness). Subsequently, the laser damage resistance (at 35… more
Date: February 23, 2010
Creator: Suratwala, T I; Miller, P E; Bude, J D; Steele, R A; Shen, N; Monticelli, M V et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Modified Magnetic Ground State in Nimn (2) O (4) Thin Films

Description: The authors demonstrate the stabilization of a magnetic ground state in epitaxial NiMn{sub 2}O{sub 4} (NMO) thin films not observed in their bulk counterpart. Bulk NMO exhibits a magnetic transition from a paramagnetic phase to a collinear ferrimagnetic moment configuration below 110 K and to a canted moment configuration below 70 K. By contrast, as-grown NMO films exhibit a single magnetic transition at 60 K and annealed films exhibit the magnetic behavior found in bulk. Cation inversion and e… more
Date: August 23, 2012
Creator: Nelson-Cheeseman, B. B.; Chopdekar, R. V.; Iwata, J. M.; Toney, M. F.; Arenholz, E. & Suzuki, Y.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Results of Chemical Analyses for Alcove 8/Niche 3 Tracer Studies

Description: This is the final report detailing the analyses performed under ORD-FY04-011 "Chemical Analyses for Alcove 8/Niche 3 Tracer Studies." The work was performed under the University and Community College System of Nevada (UCCSN) and the Department of Energy (DOE) Cooperative Agreement Number DE-FC28-04RW12232. This task provided method development and analytical support for the Alcove 8/Niche 3 Tracer Studies in the Exploratory Studies Facility (ESF). Concentrations of tracers, as well as major ani… more
Date: February 23, 2006
Creator: Daniels, Jeanette
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

New methods and materials for solid phase extraction and high performance liquid chromatography

Description: This paper describes methods for solid phase extraction and high performance liquid chromatography (HPLC). The following are described: Effects of Resin Sulfonation on the Retention of Polar Organic Compounds in Solid Phase Extraction; Ion-Chromatographic Separation of Alkali Metals In Non-Aqueous Solvents; Cation-Exchange Chromatography in Non-Aqueous Solvents; and Silicalite As a Stationary Phase For HPLC.
Date: April 23, 1996
Creator: Dumont, P.J.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
open access

High Resolution Powder Diffraction and Structure Determination

Description: It is clear that high-resolution synchrotrons X-ray powder diffraction is a very powerful and convenient tool for material characterization and structure determination. Most investigations to date have been carried out under ambient conditions and have focused on structure solution and refinement. The application of high-resolution techniques to increasingly complex structures will certainly represent an important part of future studies, and it has been seen how ab initio solution of structures… more
Date: April 23, 1999
Creator: Cox, D. E.
Item Type: Refine your search to only Book
Partner: UNT Libraries Government Documents Department
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