V XANES in spinels as an oxy-barometer in meteorites with implications for redox variations in the inner solar system

第6回極域科学シンポジウム[OA] 南極隕石11月17日（火）　国立国語研究所 2階 講

Synchrotron X-rays reveal the modes of Fe binding and trace metal storage in the brown algae Laminaria digitata and Ectocarpus siliculosus

Funding Funding from the UK Natural Environment Research Council (NERC) through grants NE/D521522/1, NE/F012705/1, and Oceans 2025 (WP4.5) programs to FCK; the National Science Foundation (CHE-1664657) and the National Oceanic & Atmospheric Administration to CJC and FCK; and the MASTS pooling initiative (Marine Alliance for Science and Technology for Scotland, funded by the Scottish Funding Council and contributing institutions; grant reference HR09011) is gratefully acknowledged by FCK. PK would like to thank the European Commission for her postdoctoral fellowship (EC-Horizon 2020-MSCA-IF, grant no. 839151). AM and HK thank the Ministry of Education, Youth and Sports of the Czech Republic with co-financing from the European Union (grant "KOROLID", CZ.02.1.01/0.0/0.0/15_003/0000336) and the Czech Academy of Sciences (RVO: 60077344). AM, FK and HK are grateful for support from the European Community in the framework of the Access to Research Infrastructure Action of the Improving Human Potential Program to the ESRF (experiment LS-2772, beamline ID16AI). AM and HK thank Czech Government funding (Členství v European Synchrotron Radiation Facility, MŠMT – 33914/2017-1) supporting their work at the ESRF. GeoSoilEnviroCARS is supported by the National Science Foundation – Earth Sciences (EAR – 1634415) and Department of EnergyGeoSciences (DE-FG02-94ER14466). This research used resources of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. Computational resources were supplied by the project "e-Infrastruktura CZ" (e-INFRA CZ LM2018140) supported by the Ministry of Education, Youth and Sports of the Czech Republic.Peer reviewedPublisher PD

Mesoscale Biotransformation of Uranium: Influences of Organic Carbon Supply Rates and Sediment Oxides

Remediation and long-term stewardship of uranium-contaminated sediments and groundwaters are critical problems at a number of DOE facilities and mining sites. Some remediation strategies based on in-situ bioreduction of U are potentially effective in significantly decreasing U concentrations in groundwaters. However, a number of basic processes require understanding in order to identify conditions more conducive to success of reduction-based U stabilization. Our current research targets several of these issues including: (1) effects of organic carbon (OC) forms and supply rates on stability of bioreduced U, (2) the roles of Fe(III)- and Mn(III,IV)-oxides as potential U oxidants in sediments, and (3) microbial community changes in relation to U redox changes. These issues were identified in our previous study on U bioreduction and reoxidation (Wan et al., 2005). Most of our studies are being conducted on historically U-contaminated sediments from Area 2 of the Field Research Center, Oak Ridge National Laboratory, in flow-through columns simulating in-situ field remediation

xraypy/xraylarch 0.9.32

Larch: X-ray Analysis for Synchrotron Applications using Pytho

xraypy/xraylarch 0.9.35rc2

Larch: X-ray Analysis for Synchrotron Applications using Pytho

Redox state of earth's magma ocean and its venus-like early atmosphere

Exchange between a magma ocean and vapor produced Earth's earliest atmosphere. Its speciation depends on the oxygen fugacity (fO2) set by the Fe3+/Fe2+ ratio of the magma ocean at its surface. Here, we establish the relationship between fO2 and Fe3+/Fe2+ in quenched liquids of silicate Earth-like composition at 2173 K and 1 bar. Mantle-derived rocks have Fe3+/(Fe3++Fe2+) = 0.037 ± 0.005, at which the magma ocean defines an fO2 0.5 log units above the iron-wüstite buffer. At this fO2, the solubilities of H-C-N-O species in the magma ocean produce a CO-rich atmosphere. Cooling and condensation of H2O would have led to a prebiotic terrestrial atmosphere composed of CO2-N2, in proportions and at pressures akin to those observed on Venus. Present-day differences between Earth's atmosphere and those of her planetary neighbors result from Earth's heliocentric location and mass, which allowed geologically long-lived oceans, in-turn facilitating CO2 drawdown and, eventually, the development of life

xraypy/XrayDB: 4.5.2

<ul> <li>fix several problems with importing database with <code>sqlalchemy</code>, now requiring version 2.0.1</li> <li>use <code>platformdirs</code> to get the configuration folder for the <code>materials.dat</code> file.</li> <li>several doc improvements</li> </ul&gt

xraypy/XrayDB: 4.5.2

<ul> <li>fix several problems with importing database with sqlalchemy, now requiring version 2.0.1</li> <li>use <code>platformdirs</code> to get the configuration folder for <code>materials.dat</code> file.</li> <li>several doc improvements</li> </ul&gt