Terrestrial Cosmogenic Nuclide Techniques for Assessing Exposure History of Surfaces and Sediments in Active Tectonic Regions

2012 ◽  
pp. 63-79 ◽  
Author(s):  
John C. Gosse
Keyword(s):  
Cosmogenic Nuclide ◽  
Active Tectonic ◽  
History Of ◽  
Exposure History

scholarly journals Origin, structure and exposure history of a wave-cut platform more than 1 Ma in age at the coast of northern Spain: A multiple cosmogenic nuclide approach

Geomorphology ◽  
2008 ◽  
Vol 93 (3-4) ◽  
pp. 316-334 ◽  
Author(s):  
J. Alvarez-Marrón ◽  
R. Hetzel ◽  
S. Niedermann ◽  
R. Menéndez ◽  
J. Marquínez
Keyword(s):  
Northern Spain ◽  
Cosmogenic Nuclide ◽  
History Of ◽  
Exposure History

scholarly journals 451. Evaluation of Exposure History in Healthcare Personnel with Coronavirus 2019 Disease

2020 ◽  
Vol 7 (Supplement_1) ◽  
pp. S293-S293
Author(s):  
Sandra Silva ◽  
Thriveen Mana ◽  
Davinder Bhullar ◽  
Beatrice Tabor ◽  
Curtis Donskey
Keyword(s):  
High Risk ◽  
Risk Exposure ◽  
Healthcare Personnel ◽  
Administrative Personnel ◽  
Asymptomatic Carriage ◽  
Moderate Disease ◽  
Control And Prevention ◽  
History Of ◽  
Exposure History ◽  
Atypical Presentations

Abstract Background During the Coronavirus Disease 2019 (COVID-19) pandemic, many healthcare personnel (HCP) have developed COVID-19. However, there is uncertainty regarding whether severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) was acquired at work versus in the community. Methods We conducted a cohort study to examine exposure history of personnel with COVID-19 infection or asymptomatic carriage in a VA healthcare system. High-risk exposures were classified based Centers for Disease Control and Prevention criteria. Results Of 578 personnel tested, 49 (8%) had nasopharyngeal swabs with positive PCR results, including 45 (92%) with and 4 (8%) without COVID-19 symptoms. Of the 49 cases, 21 (43%) had a documented high-risk exposure at work, including 14 exposures to COVID-19 patients and 7 exposures to colonized or infected personnel. Exposures to infected patients most often were a result of delays in recognition of COVID-19 due to atypical presentations. Exposures to personnel with COVID-19 most often involved activities such as meals when facemasks were not worn. Most cases occurred among nurses (26, 53%) and administrative personnel (10, 20%); only 3 physicians developed COVID-19. No cases occurred in personnel working on COVID-19 wards. All personnel had mild or moderate disease. Conclusion Forty-three percent of healthcare personnel with COVID-19 had prior high-risk exposures at work. Improved detection of patients with atypical presentations and efforts to reduce high-risk contacts among personnel may reduce the risk for acquisition of SARS-CoV-2. Disclosures All Authors: No reported disclosures

scholarly journals The complex exposure history of the Jiddat al Harasis 073 L-chondrite shower

2008 ◽  
Vol 43 (10) ◽  
pp. 1691-1708 ◽  
Author(s):  
L. HUBER ◽  
E. GNOS ◽  
B. HOFMANN ◽  
K. C. WELTEN ◽  
K. NISHIIZUMI ◽  
...  
Keyword(s):  
History Of ◽  
Exposure History

Exposure history of individual cosmic particles

1991 ◽  
Vol 104 (2-4) ◽  
pp. 315-324 ◽  
Author(s):  
K. Nishiizumi ◽  
J.R. Arnold ◽  
D. Fink ◽  
J. Klein ◽  
R. Middleton ◽  
...  
Keyword(s):  
History Of ◽  
Exposure History

scholarly journals Modeling the Complex Exposure History of Smoking in Predicting Bladder Cancer

Epidemiology ◽  
2019 ◽  
Vol 30 (3) ◽  
pp. 458-465 ◽  
Author(s):  
Frits H. M. van Osch ◽  
Jelle Vlaanderen ◽  
Sylvia H. J. Jochems ◽  
Cristina Bosetti ◽  
Jerry Polesel ◽  
...  
Keyword(s):  
Bladder Cancer ◽  
History Of ◽  
Exposure History

Exposure history of the lunar meteorite, Elephant Moraine 87521

1993 ◽  
Vol 57 (15) ◽  
pp. 3793-3799 ◽  
Author(s):  
S Vogt ◽  
G.F Herzog ◽  
O Eugster ◽  
Th Michel ◽  
S Niedermann ◽  
...  
Keyword(s):  
Lunar Meteorite ◽  
History Of ◽  
Exposure History

scholarly journals Weathering of Ophiolite Remnant and Formation of Ni Laterite in a Strong Uplifted Tectonic Region (Yuanjiang, Southwest China)

Minerals ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 51 ◽  
Author(s):  
Wei Fu ◽  
Yangyang Feng ◽  
Peng Luo ◽  
Yinmeng Zhang ◽  
Xiaorong Huang ◽  
...  
Keyword(s):  
Southwest China ◽  
Tectonic Setting ◽  
Continuous Operation ◽  
Tectonic Uplift ◽  
Yunnan Plateau ◽  
Active Tectonic ◽  
History Of ◽  
Southwestern Margin ◽  
Planation Surfaces ◽  
Weathering Process

The Yuanjiang Ni deposit in southwestern margin of the Yunnan Plateau is the only economically important lateritic Ni deposit in China. It contains 21.2 Mt ore with an average grade of 1.05 wt % Ni and has been recognized as the second largest Ni producer in China following the Jinchuan super-large magmatic Ni–Cu deposit. This Ni deposit is hosted within the lateritic regolith derived from serpentinite within the regional Paleo-Tethyan Ophiolite remnants. Local landscape controls the distribution of the Ni mineralized regolith, and spatially it is characterized by developing on several stepped planation surfaces. Three types of lateritic Ni ores are identified based on Ni-hosting minerals, namely oxide ore, oxide-silicate mixed ore and silicate ore. In the dominant silicate ore, two phyllosilicate minerals (serpentine and talc) are the Ni-host minerals. Their Ni compositions, however, are remarkably different. Serpentine (0.34–1.2 wt % Ni) has a higher Ni concentration than talc (0.18–0.26 wt % Ni), indicating that the serpentine is more significantly enriched in Ni during weathering process compared to talc. This explains why talc veining reduces Ni grade. The geochemical index (S/SAF value = 0.33–0.81, UMIA values = 17–60) indicates that the serpentinite-derived regolith has experienced, at least, weak to moderate lateritization. Based on several lines of paleoclimate evidence, the history of lateritization at Yuanjiang area probably dates to the Oligocene-Miocene boundary and has extended to the present. With a hydrology-controlled lateritization process ongoing, continuous operation of Ni migration from the serpentinite-forming minerals to weathered minerals (goethite and serpentine) gave rise to the development of three types of Ni ore in the regolith. Notably, the formation and preservation of the Yuanjiang lateritic Ni deposit has been strongly impacted by regional multi-staged tectonic uplift during the development of Yunnan Plateau. This active tectonic setting has promoted weathering of serpentinite and supergene Ni enrichment, but is also responsible for its partial erosion.

scholarly journals The orbit and exposure history of the Piplia Kalan eucrite

1998 ◽  
Vol 33 (3) ◽  
pp. 455-461 ◽  
Author(s):  
N. BHANDARI ◽  
S. V. S. MURTY ◽  
K. M. SUTHAR ◽  
A. D. SHUKLA ◽  
G. M. BALLABH ◽  
...  
Keyword(s):  
History Of ◽  
Exposure History

scholarly journals The history of the Tissint meteorite, from its crystallization on Mars to its exposure in space: New geochemical, isotopic, and cosmogenic nuclide data

2020 ◽  
Vol 55 (2) ◽  
pp. 294-311 ◽  
Author(s):  
Toni Schulz ◽  
Pavel P. Povinec ◽  
Ludovic Ferrière ◽  
A. J. Timothy Jull ◽  
Andrej Kováčik ◽  
...  
Keyword(s):  
Cosmogenic Nuclide ◽  
History Of
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