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Browse almost 5,000 conference papers authored by our scientists and refine search by topic, location, year, and advanced search.

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Geomorphometric analysis of the Summit and Ridge classes of the Geographic Names Information System Geomorphometric analysis of the Summit and Ridge classes of the Geographic Names Information System

This research aims to conduct a geosemantic comparison of landforms classified in the Summit and Ridge feature classes in the Geographic Names Information System (GNIS). The comparison is based on a 2D shape analysis of manually delineated polygons produced by USGS staff to correspond to 33,304 Summit and 8,006 Ridge features. Five shape measures were chosen for this specific...
Authors
Sinha Gaurav, Samantha Arundel, Romim Somadder, David P. Martin, Kevin G McKeehan
By
Core Science Systems Mission Area, Center of Excellence for Geospatial Information Science (CEGIS), National Geospatial Technical Operations Center

Rare earth element sources, end-use demand trends, and hydrometallurgical separations Rare earth element sources, end-use demand trends, and hydrometallurgical separations

Rare earth elements are increasing in demand due to the movement towards electrification. In particular, there is a growing need for high performance rare earth permanent magnets for motors and generators used to convert electrical energy to mechanical energy, and vice versa. Current trends in rare earth demand are reviewed and discussed as the specific rare earth metal demand can...
Authors
James Vaughan, Vitor L. Gontijo, Rick Valenta, Elisa Alonso
By
National Minerals Information Center

Towards improved code-based performance objectives for liquefaction hazard analysis Towards improved code-based performance objectives for liquefaction hazard analysis

Ground failure due to liquefaction in loose sand deposits poses substantial risks to the built environment, and has caused significant damage in past earthquakes to a wide range of infrastructure. Advances in liquefaction hazard analysis in practice have largely stagnated in recent years; the state of practice remains rooted in simplified procedures that ignore considerable uncertainties...
Authors
Andrew James Makdisi, Steven L. Kramer
By
Natural Hazards Mission Area, Geologic Hazards Science Center

A review of geology and mining in the Marble Mountains, southeastern California A review of geology and mining in the Marble Mountains, southeastern California

Mining in the Marble Mountains of southeastern California was active in the earliest 1900s and gradually declined to very few active mines by 1959. Most mining consisted of hard-rock prospects and mines, with a few soft-rock prospects and one mine. The Marble Mountains are a 10 km by 30 km, gently NE-dipping dipping structural block composed of Proterozoic plutonic and metamorphic rocks...
Authors
David C. Buesch, Bruce W. Bridenbecker
By
Geology, Minerals, Energy, and Geophysics Science Center

Hyperspectral cathodoluminescence and quantitative EPMA mapping of angrite northwest Africa 15507 Hyperspectral cathodoluminescence and quantitative EPMA mapping of angrite northwest Africa 15507

Angrite meteorites represent alkali depleted planetary crust of basaltic composition, and have both plutonic and volcanic lithologies. NWA 15507 is a microgabbroic specimen (mean grainsize ~1.4 mm) composed predominantly of zoned Al-Ti-augite, Ca-bearing olivine and anorthite together with accessory kirschsteinite, rhönite, hercynite, low-Ni kamacite, merrillite, magnetite and troilite...
Authors
Heather A. Lowers, Jay Michael Thompson, Paul K. Carpenter, Zoe Wilbur, Anthony Irving
By
Geology, Geophysics, and Geochemistry Science Center

Vortex trapping of sand grains over ripples under oscillatory flow Vortex trapping of sand grains over ripples under oscillatory flow

Sand ripples significantly impact morphodynamics in the nearshore by generating coherent vortices, which can transport suspended sediment to greater heights in the water column than above flat beds. Coherent vortices can trap sediment grains if the settling velocity of the grain is smaller than the maximum vertical fluid velocity in the vortex (Nielsen 1992). Particle image and tracking
Authors
Donya P. Frank-Gilchrist, Allison Penko, Margaret L. Palmsten, Joseph Calantoni
By
St. Petersburg Coastal and Marine Science Center
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