Zobrazeno 1 - 10
of 365
pro vyhledávání: '"Robert T. Downs"'
Publikováno v:
Scientific Reports, Vol 14, Iss 1, Pp 1-10 (2024)
Abstract Understanding changes in material properties through external stimuli plays a key role in validating the expected performance of materials and engineering material properties in a controlled manner. Here, we introduce a fundamental protocol
Externí odkaz:
https://doaj.org/article/9c776433b850405ca54351e67a51917f
Autor:
David Vaniman, Steve Chipera, Elizabeth Rampe, Thomas Bristow, David Blake, Johannes Meusburger, Tanya Peretyazhko, William Rapin, Jeff Berger, Douglas Ming, Patricia Craig, Nicholas Castle, Robert T. Downs, Shaunna Morrison, Robert Hazen, Richard Morris, Aditi Pandey, Allan H. Treiman, Albert Yen, Cherie Achilles, Benjamin Tutolo, Elisabeth Hausrath, Sarah Simpson, Michael Thorpe, Valerie Tu, David J. Des Marais, John Grotzinger, Abigail Fraeman
Publikováno v:
Minerals, Vol 14, Iss 8, p 815 (2024)
Gypsum is a common mineral at Gale crater on Mars, currently being explored by the Mars Science Laboratory (MSL) rover, Curiosity. In this paper, we summarize the associations of gypsum with other sulfate minerals (bassanite, anhydrite, jarosite, sta
Externí odkaz:
https://doaj.org/article/101618f56e2b467b8227c614a41bd732
Autor:
Shaunna M. Morrison, David F. Blake, Thomas F. Bristow, Nicholas Castle, Steve J. Chipera, Patricia I. Craig, Robert T. Downs, Ahmed Eleish, Robert M. Hazen, Johannes M. Meusburger, Douglas W. Ming, Richard V. Morris, Aditi Pandey, Anirudh Prabhu, Elizabeth B. Rampe, Philippe C. Sarrazin, Sarah L. Simpson, Michael T. Thorpe, Allan H. Treiman, Valerie Tu, Benjamin M. Tutolo, David T. Vaniman, Ashwin R. Vasavada, Albert S. Yen
Publikováno v:
Minerals, Vol 14, Iss 8, p 773 (2024)
This study presents mineral composition estimates of rock and sediment samples analyzed with the CheMin X-ray diffraction instrument on board the NASA Mars Science Laboratory rover, Curiosity, in Gale crater, Mars. Mineral composition is estimated us
Externí odkaz:
https://doaj.org/article/7c135b9bf5f244db9b0d8f186caf5c4c
Publikováno v:
Minerals, Vol 14, Iss 3, p 307 (2024)
Eddavidite is a new mineral species (IMA2018-010) with ideal formula, Cu12Pb2O15Br2, and cubic Fm3¯m symmetry: a = 9.2407(9) Å; V = 789.1(2) Å3; Z = 2. Eddavidite is the bromine analog of murdochite, Cu12Pb2O15Cl2, with which it forms a solid solu
Externí odkaz:
https://doaj.org/article/a0fb53fb9997441b8a191fa9af0ac01d
Publikováno v:
Crystals, Vol 14, Iss 2, p 127 (2024)
Powder X-ray diffraction (XRD) is a widely accepted technique for detecting trace asbestos content in solid samples. However, accurately quantifying asbestos concentrations below 0.5 wt% presents significant challenges with XRD alone. To address this
Externí odkaz:
https://doaj.org/article/e179f87253424cb2be9897a403550ac7
Autor:
Daniel R. Hummer, Joshua J. Golden, Grethe Hystad, Robert T. Downs, Ahmed Eleish, Chao Liu, Jolyon Ralph, Shaunna M. Morrison, Michael B. Meyer, Robert M. Hazen
Publikováno v:
Nature Communications, Vol 13, Iss 1, Pp 1-7 (2022)
The co-evolution of oxygenation of the Earth’s atmosphere and lithosphere is still poorly constrained. However, the oxidation state of manganese minerals reveals that the redox state of Earth’s crust responds to changes in atmospheric oxygen foll
Externí odkaz:
https://doaj.org/article/918ea0cb555a4ed7b1b5bc7695451a50
Autor:
Allan H. Treiman, Nina L. Lanza, Scott VanBommel, Jeff Berger, Roger Wiens, Thomas Bristow, Jeffrey Johnson, Melissa Rice, Reginald Hart, Amy McAdam, Patrick Gasda, Pierre-Yves Meslin, Albert Yen, Amy J. Williams, Ashwin Vasavada, David Vaniman, Valerie Tu, Michael Thorpe, Elizabeth D. Swanner, Christina Seeger, Susanne P. Schwenzer, Susanne Schröder, Elizabeth Rampe, William Rapin, Silas J. Ralston, Tanya Peretyazhko, Horton Newsom, Richard V. Morris, Douglas Ming, Matteo Loche, Stéphane Le Mouélic, Christopher House, Robert Hazen, John P. Grotzinger, Ralf Gellert, Olivier Gasnault, Woodward W. Fischer, Ari Essunfeld, Robert T. Downs, Gordon W. Downs, Erwin Dehouck, Laura J. Crossey, Agnes Cousin, Jade M. Comellas, Joanna V. Clark, Benton Clark, Steve Chipera, Gwenaël Caravaca, John Bridges, David F. Blake, Ryan Anderson
Publikováno v:
Minerals, Vol 13, Iss 9, p 1122 (2023)
The MSL Curiosity rover investigated dark, Mn-P-enriched nodules in shallow lacustrine/fluvial sediments at the Groken site in Glen Torridon, Gale Crater, Mars. Applying all relevant information from the rover, the nodules are interpreted as pseudomo
Externí odkaz:
https://doaj.org/article/3849059bb6544a1a9679d18af222ecab
Autor:
Anirudh Prabhu, Shaunna M. Morrison, Ahmed Eleish, Hao Zhong, Fang Huang, Joshua J. Golden, Samuel N. Perry, Daniel R. Hummer, Jolyon Ralph, Simone E. Runyon, Kathleen Fontaine, Sergey Krivovichev, Robert T. Downs, Robert M. Hazen, Peter Fox
Publikováno v:
Geoscience Data Journal, Vol 8, Iss 1, Pp 74-89 (2021)
Abstract Minerals contain important clues to understanding the complex geologic history of Earth and other planetary bodies. Therefore, geologists have been collecting mineral samples and compiling data about these samples for centuries. These data h
Externí odkaz:
https://doaj.org/article/2590482944a34d03a90ea1a731cdbfa2
Autor:
Robert M. Hazen, Robert T. Downs, Ahmed Eleish, Peter Fox, Olivier C. Gagné, Joshua J. Golden, Edward S. Grew, Daniel R. Hummer, Grethe Hystad, Sergey V. Krivovichev, Congrui Li, Chao Liu, Xiaogang Ma, Shaunna M. Morrison, Feifei Pan, Alexander J. Pires, Anirudh Prabhu, Jolyon Ralph, Simone E. Runyon, Hao Zhong
Publikováno v:
Engineering, Vol 5, Iss 3, Pp 397-405 (2019)
Large and growing data resources on the diversity, distribution, and properties of minerals are ushering in a new era of data-driven discovery in mineralogy. The most comprehensive international mineral database is the IMA database, which includes in
Externí odkaz:
https://doaj.org/article/a2d972ba84fe40f7a19228f856cd1d8f
Autor:
Shaunna M. Morrison, Joy Buongiorno, Robert T. Downs, Ahmed Eleish, Peter Fox, Donato Giovannelli, Joshua J. Golden, Daniel R. Hummer, Grethe Hystad, Louise H. Kellogg, Oliver Kreylos, Sergey V. Krivovichev, Chao Liu, Andrew Merdith, Anirudh Prabhu, Jolyon Ralph, Simone E. Runyon, Sabin Zahirovic, Robert M. Hazen
Publikováno v:
Frontiers in Earth Science, Vol 8 (2020)
Large and growing data resources on the spatial and temporal diversity and distribution of the more than 400 carbon-bearing mineral species reveal patterns of mineral evolution and ecology. Recent advances in analytical and visualization techniques l
Externí odkaz:
https://doaj.org/article/0200a84c6ad04d18a53b3ccd2e107c54