A5003369498- Geological and Geochemical Analysis
- Nuclear Materials and Properties
- Mass Spectrometry Techniques and Applications
- earthquake and tectonic studies
- Ion-surface interactions and analysis
- Nuclear and radioactivity studies
- Analytical chemistry methods development
- Geochemistry and Geologic Mapping
- Nuclear reactor physics and engineering
- Mercury impact and mitigation studies
- Radioactive element chemistry and processing
- Geochemistry and Elemental Analysis
- Laser-induced spectroscopy and plasma
- Electrocatalysts for Energy Conversion
- Graphite, nuclear technology, radiation studies
- Fuel Cells and Related Materials
- Heavy metals in environment
- Advanced battery technologies research
- Paleontology and Stratigraphy of Fossils
- High-pressure geophysics and materials
- Plasma Diagnostics and Applications
- Radioactive contamination and transfer
- Geology and Paleoclimatology Research
- Heavy Metal Exposure and Toxicity
- Photorefractive and Nonlinear Optics
Los Alamos National Laboratory
2012-2024
University of Washington
2022
Naval Information Warfare Center Pacific
2022
University of Venda
2012
Temple University
2008
Observatoire Midi-Pyrénées
2004
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2004
Direction des énergies
2004
CEA Paris-Saclay
2004
West Virginia University
2000
This work addresses issues of long-term durability hydrogen-air polymer electrolyte fuel cells (PEFCs). The chromium in a binary alloy catalyst has been found to migrate from cathode anode during the course life testing when operating within oversaturated, or high-humidity, gas feed regime (one both inlet feeds with dew point equal higher than cell temperature) above current density. Other major factors such as membrane degradation, dissolution catalyst-layer recast ionomer, oxidation, and...
Direct dating of mylonite evolution: a multi-disciplinary geochronological study from the Moine Thrust Zone, NW Scotland
Recently, laser-induced breakdown spectroscopy (LIBS) has been developed for the elemental analysis of geological samples application to space exploration. There is also interest in using technique water ice and ice/dust mixtures located at Mars polar regions. The a compact instrument lander or rover Martian poles interrogate stratified layers dusts that contain record past geologic history, believed date back several million years. Here we present results study use LIBS situ short stand-off...
Most automobile catalysts consist of a CeO2- and Al2O3-rich washcoat deposited on porous, honeycombed cordierite support block. The active ingredients in the catalyst are several noble metals (usually Pd, Rh Pt) contained washcoat. Rapid, precise accurate quantification is desirable for metal tracking accountability. Determination Pt by ID–ICP-MS possible only after extensive treatment with highly corrosive acids sealed quartz tubes at high temperatures. By contrast, GDMS permits direct...
The mid-Paleozoic, greenschist-grade Rockfish Valley Fault Zone (RVFZ) of central Virginia cuts the Grenville-aged Pedlar River Charnockite Suite (PRCS) and contains zircons that underwent brittle failure during ductile deformation. Electron microprobe analyses scanning electron microscope (SEM) backscattered (BSE) imaging show from protolith PRCS are concentrically zoned (with alternating U-Hf-rich U-Hf-poor bands), contain numerous radial microcracks. Zircons RVFZ mylonite unzoned,...
The fundamental requirements for the optimum mechanical interface between a glow discharge ion source and mass spectrometer are described in this paper. Specifically, properties of typical compared contrasted to those inductively coupled plasma source. critical parameters theoretical considerations interfaces reviewed, results experiments using both quadrupole time-of-flight spectrometers with presented. experimental clarify several important problems sampling process. Our findings indicate...
Research Article| August 01, 2000 Fluid expulsion and dilatancy pumping during thrusting in the Pyrenees: Pb Sr isotope evidence Andrew M. McCaig; McCaig 1School of Earth Sciences, University Leeds, Leeds LS2 9JT, UK Search for other works by this author on: GSW Google Scholar David Wayne; Wayne 2Nuclear Materials Technology Division, NMT-1, M.S. G740, Los Alamos National Laboratories, Alamos, New Mexico 87545, USA Jeffrey Rosenbaum 3University Reading, Postgraduate Institute Sedimentology,...
Investigations involving laser-based sampling of copper into an auxiliary pulsed glow discharge for ionization and excitation are presented. The interaction the ablated with was studied by monitoring atom emission signal at 368.744 nm. Results demonstrate ability to time ablation appropriately access specific temporal regions plasma. More specifically, laser-ablated material introduced negative during afterpeak. Ionization accomplished collisions a metastable argon population produced...
A new thermal ionization source for use with a quadrupole mass spectrometer has been designed and characterized. The provides significant advantages over the previously reported prototype traditional filament-type sources. operational interface between redesigned. vacuum interlock, translational stage, an adjustable insertion probe are added to improve performance. With these modifications, is easier operate while maximizing sample throughput. In this work, performance of newly developed...
Abstract Rb-Sr and Pb-Pb data are reported from separated minerals (amphibole, albite, calcite, epidote), altered wall rocks, fluid inclusions trapped in quartz, veins associated with retrogressive shear zones cutting the Néouvielle granodiorite massif central French Pyrenees. Alteration was caused by movement of hypersaline brines during deformation. Shear similar kinematics occur granodiorites high grade gneisses throughout northern Axial Zone Pyrenees, have been attributed variously to...