A5077898513- Planetary Science and Exploration
- Astro and Planetary Science
- Space Exploration and Technology
- Geology and Paleoclimatology Research
- Paleontology and Stratigraphy of Fossils
- Space Science and Extraterrestrial Life
- Geological and Geochemical Analysis
- Thermal and Kinetic Analysis
- Geochemistry and Geologic Mapping
- Crystal Structures and Properties
- Mineralogy and Gemology Studies
- Hydrocarbon exploration and reservoir analysis
- Polymer crystallization and properties
- Domain Adaptation and Few-Shot Learning
- Advanced Polymer Synthesis and Characterization
- Granular flow and fluidized beds
- Recycling and Waste Management Techniques
- Organometallic Complex Synthesis and Catalysis
- Various Chemistry Research Topics
- Glass properties and applications
- Asymmetric Hydrogenation and Catalysis
- Isotope Analysis in Ecology
- Polymer Nanocomposites and Properties
- Inorganic Fluorides and Related Compounds
- Catalysis and Oxidation Reactions
University of Arizona
2019-2023
Stanford University
2023
Chesapeake Bay Program
2020
Universities Space Research Association
2019
Arcadia
2011-2012
University High School
2011-2012
Abstract Vera Rubin ridge (VRR) is an erosion‐resistant feature on the northwestern slope of Mount Sharp in Gale crater, Mars, and orbital visible/shortwave infrared measurements indicate it contains red hematite. The Mars Science Laboratory Curiosity rover performed extensive campaign VRR to study its mineralogy, geochemistry, sedimentology determine depositional diagenetic history constrain processes by which hematite could have formed. X‐ray diffraction (XRD) data from CheMin instrument...
Modified clay minerals on Mars Sedimentary rocks exposed in Gale crater contain extensive minerals. Bristow et al. analyzed drill samples collected by the Curiosity rover as it climbed up sedimentary layers crater. They found evidence of past reactions with liquid water and sulfate brines, which could have percolated through from an overlying deposit. Similar deposits are widespread across planet represent some last to form before lost its surface water, so results inform our understanding...
Abstract The Glen Torridon (GT) region in Gale crater, Mars is a with strong clay mineral signatures inferred from orbital spectroscopy. CheMin X‐ray diffraction (XRD) instrument onboard the Science Laboratory rover, Curiosity , measured some of highest abundances to date within GT, complementing detections. GT may also be unique because XRD patterns samples, identified new phases, including: (a) Fe‐carbonates, and (b) phase novel peak at 9.2 Å. Fe‐carbonates have been previously suggested...
Abstract For the first time on Mars, crystalline magnesium‐sulfate mineral starkeyite (MgSO 4 ‧4H 2 O) was definitively identified using CheMin X‐ray diffraction instrument at Gale crater. At Canaima drill site, along with amorphous MgSO ‧ n H O are among “polyhydrated Mg‐sulfates” interpreted in orbital reflectance spectra. Mg‐sulfates good climate indicators as they very responsive to changes temperature and relative humidity. We hypothesize that, through evaporation, formed end of brine...
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Abstract Hydrothermal high sanidine and specular hematite are found within ferric‐rich gray‐colored cemented basaltic breccia occurring horizontal, weathering‐resistant strata exposed in an erosional gully of the Pu'u Poliahu cinder cone summit region Maunakea volcano (Hawai'i). The was extensively altered by hydrothermal, acid‐sulfate fluids at temperatures up to ~400 °C, and, strata, plagioclase removed dissolution from progenitor Hawaiitic basalt, were precipitated. Fe 2 O 3 T...
The MSL Curiosity rover investigated dark, Mn-P-enriched nodules in shallow lacustrine/fluvial sediments at the Groken site Glen Torridon, Gale Crater, Mars. Applying all relevant information from rover, are interpreted as pseudomorphs after original crystals of vivianite, (Fe2+,Mn2+)3(PO4)2·8H2O, that cemented sediment soon deposition. appear to have flat faces and linear boundaries stand above surrounding siltstone. ChemCam LIBS (laser-induced breakdown spectrometry) shows MnO abundances...
The influence on polyethene characteristics of titania incorporation into a Cr/silica catalyst, CO reduction and productivity has been investigated. Molecular weight (MW) molecular-weight distribution (MWD) were dependent all three variables: MW decreased MWD broadened with content: increased narrowed reduction, productivity. magnitudes the effects variables different. changes in are discussed compared alternative models for active site distribution.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHYDROGEN IODIDE AS RADICAL ACCEPTOR IN THE THERMAL DECOMPOSITION OF GASEOUS ORGANIC IODIDESR. K. Boyd, G. W. Downs, J. S. Gow, and C. HorrexCite this: Phys. Chem. 1963, 67, 3, 719–720Publication Date (Print):March 1, 1963Publication History Published online1 May 2002Published inissue 1 March 1963https://pubs.acs.org/doi/10.1021/j100797a508https://doi.org/10.1021/j100797a508research-articleACS PublicationsRequest reuse permissionsArticle...
Visual data such as images and videos are typically modeled discretizations of inherently continuous, multidimensional signals. Existing continuous-signal models attempt to exploit this fact by modeling the underlying signals visual (e.g., image) directly. However, these have not yet been able achieve competitive performance on practical vision tasks large-scale image video classification. Building a recent line work deep state space (SSMs), we propose S4ND, new SSM layer that extends...
The crystal structure of durangite, ideally NaAl(AsO(4))F (chemical name sodium aluminium arsenate fluoride), has been determined previously [Kokkoros (1938). Z. Kristallogr.99, 38-49] using Weissenberg film data without reporting displacement parameters atoms or a reliability factor. This study reports the redetermination durangite single-crystal X-ray diffraction from natural sample with composition (Na(0.95)Li(0.05))(Al(0.91)Fe(3+) (0.07)Mn(3+) (0.02))(AsO(4))(F(0.73)(OH)(0.27)) type...
The crystal structure of eveite, ideally Mn(2)(AsO(4))(OH) [dimanganese(II) arsenate(V) hydroxide], was refined from a single selected co-type sample Långban, Filipstad, Varmland, Sweden. Eveite, dimorphic with sarkinite, is structurally analogous the important rock-forming mineral andalusite, Al(2)OSiO(4), and belongs to libethenite group. Its consists chains edge-sharing distorted [MnO(4)(OH)(2)] octa-hedra (..2 symmetry) extending parallel [001]. These are cross-linked by isolated AsO(4)...
The two independent molecules in the asymmetric unit confirm a fac-octahedral metal geometry with bond distances Mo-P (mean) 2.502 (4) and Mo-C 1.964 (12) A