A5091135015- Geological and Geochemical Analysis
- Geochemistry and Geologic Mapping
- High-pressure geophysics and materials
- earthquake and tectonic studies
- Geochemistry and Elemental Analysis
- Paleontology and Stratigraphy of Fossils
- Radioactive element chemistry and processing
- Chemical Synthesis and Characterization
- Spectral Theory in Mathematical Physics
- Astro and Planetary Science
- Extraction and Separation Processes
- Chromium effects and bioremediation
- Advanced Mathematical Modeling in Engineering
- Inorganic Chemistry and Materials
- Recycling and Waste Management Techniques
- Groundwater and Isotope Geochemistry
- Fusion materials and technologies
- Quantum many-body systems
- Geological formations and processes
- Mining and Resource Management
- Geological Modeling and Analysis
- Mineral Processing and Grinding
- Quantum and electron transport phenomena
- Geology and Paleoclimatology Research
- Quantum Information and Cryptography
United States Geological Survey
2018-2019
Entertainment Industries Council
2018
United States Department of the Interior
2018
University of Maryland, College Park
2009
First posted December 19, 2017 For additional information, contact: Mineral Resources Program Coordinator U.S. Geological Survey 913 National Center Reston, VA 20192Email: minerals@usgs.gov https://minerals.usgs.gov The platinum-group elements (PGEs)—platinum, palladium, rhodium, ruthenium, iridium, and osmium—are metals that have similar physical chemical properties tend to occur together in nature. PGEs are indispensable many industrial applications but mined only a few places....
Gallium (Ga) concentrations for bauxite deposits worldwide have been compiled from the literature to provide a basis research regarding occurrence and distribution of Ga worldwide, as well between types deposits. In addition, this report is an attempt bring together reported concentration data into one database supplement ongoing U.S. Geological Survey studies critical mineral resources. The compilation consists location, deposit size, type host rock, development status, major oxide data,...
First posted December 19, 2017 For additional information, contact: Mineral Resources Program Coordinator U.S. Geological Survey 913 National Center Reston, VA 20192Email: minerals@usgs.gov https://minerals.usgs.gov Gallium is a soft, silvery metallic element with an atomic number of 31 and the chemical symbol Ga. used in wide variety products that have microelectronic components containing either gallium arsenide (GaAs) or nitride (GaN). GaAs able to change electricity directly into laser...
Stratiform chromite deposits are of great economic importance, yet their origin and evolution remain highly debated. Layered igneous intrusions such as the Bushveld, Great Dyke, Kemi, Stillwater Complexes, provide opportunities for studying magmatic differentiation processes assimilation within crust, well related ore-deposit formation. Chromite-rich seams layered host majority world's chromium reserves may contain significant platinum-group-element (PGE) mineralization. This model...
A new descriptive stratiform chromite deposit model was prepared which will provide a framework for understanding the characteristics of deposits worldwide. Previous models developed by U.S. Geological Survey (USGS) have been referred to as Bushveld chromium, because Complex in South Africa is only stratified, mafic-ultramafic intrusion presently mined and most intensely researched. As part on-going effort USGS Mineral Resources Program update existing upcoming national mineral resource...
First posted December 19, 2017 For additional information, contact: Mineral Resources Program Coordinator U.S. Geological Survey 913 National Center Reston, VA 20192Email: minerals@usgs.gov https://minerals.usgs.gov Beryllium is a mineral commodity that used in variety of industries to make products are essential for the smooth functioning modern society. Two minerals, bertrandite (which supplied domestically) and beryl currently solely by imports), necessary ensure stable supply high-purity...
First posted April 4, 2018 For additional information, contact: Director, Eastern Mineral and Environmental Resources 12201 Sunrise Valley Drive Mail Stop 954 Reston, VA 20192 The U.S. Geological Survey (USGS) conducted a program of bedrock geologic mapping in much the central western Upper Peninsula Michigan from 1940s until late 1990s. Geologic studies this region are hampered by scarcity exposures because nearly continuous blanket unconsolidated sediments resulting glaciation during...
We study the free XXZ quantum spin model defined on a ring of size $L$ and show that bipartite entanglement entropy eigenstates belonging to first energy band above vacuum ground state satisfies logarithmically corrected area law. Along way, we Combes-Thomas estimate for fiber operators which can also be applied discrete many-particle Schr\"odinger more general translation-invariant graphs.
We consider a multi-dimensional continuum Schr\"odinger operator $H$ which is given by perturbation of the negative Laplacian compactly supported bounded potential. show that, for fairly large class test functions, second-order Szeg\H{o}-type asymptotics spatially truncated Fermi projection independent potential and, thus, identical to known Laplacian.