Results 61 to 70 of about 2,936 (194)

Terrestrial ages of meteorites from the Atacama Desert (Chile) and insights into the past meteorite flux to Earth

Meteoritics &Planetary Science, EarlyView.
Abstract The Atacama Desert in Chile is characterized by its high meteorite density and old meteorite terrestrial ages. In this work, we present new terrestrial ages derived from measurements of the concentration of cosmogenic 36Cl in the metal fraction of 51 ordinary chondrites collected over a 6.8 km2 area located in the Catalina Dense Collection ...
Carine Sadaka, Jérôme Gattacceca, Florian Dumas, Régis Braucher, ASTER Team, Ingo Leya, Mohammad Tauseef, Pierre‐Henri Blard, David Bekaert, Evelyn Füri, Laurent Zimmermann, Anthony Lagain, Hadrien A. R. Devillepoix, Matthieu Gounelle   +13 more
wiley   +1 more source

Oligotrophic Growth of Nitrate-Dependent Fe2+-Oxidising Microorganisms Under Simulated Early Martian Conditions

Frontiers in Microbiology, 2022
Nitrate-dependent Fe2+ oxidation (NDFO) is a microbially mediated process observed in many anaerobic, low-nutrient (oligotrophic) neutral–alkaline environments on Earth, which describes oxidation of Fe2+ to Fe3+ in tandem with microbial nitrate reduction.
Alex Price, Michael C. Macey, Victoria K. Pearson, Susanne P. Schwenzer, Nisha K. Ramkissoon, Karen Olsson-Francis   +5 more
doaj   +1 more source

Martian Surface Paleotemperatures from Thermochronology of Meteorites

Science, 2005
The temporal evolution of past martian surface temperatures is poorly known. We used thermochronology and published noble gas and petrographic data to constrain the temperature histories of the nakhlites and martian meteorite ALH84001. We found that the nakhlites have not been heated to more than 350°C since they formed.
Shuster, David L., Weiss, Benjamin P.
openaire   +3 more sources

Collective Attention in Virtual Teams: A Pathway for Mitigating Communication Delays

Personnel Psychology, EarlyView.
ABSTRACT Virtual work has become a defining feature of modern organizations, intensifying the need for strategies that support virtual team performance. Communication delays—prolonged intervals between sending and receiving messages—are one of the most persistent and consequential barriers to virtual team performance.
Dorothy Carter, Alina Lungeanu, Joshua Pearman, Nathan Carter, Laura Bauer, Jacob Pendergraft, Lauren Landon, Marissa Shuffler, Leslie DeChurch, Noshir Contractor   +9 more
wiley   +1 more source

The Martian surface radiation environment – a comparison of models and MSL/RAD measurements

Journal of Space Weather and Space Climate, 2016
Context: The Radiation Assessment Detector (RAD) on the Mars Science Laboratory (MSL) has been measuring the radiation environment on the surface of Mars since August 6th 2012. MSL-RAD is the first instrument to provide detailed information about charged
Matthiä Daniel, Ehresmann Bent, Lohf Henning, Köhler Jan, Zeitlin Cary, Appel Jan, Sato Tatsuhiko, Slaba Tony, Martin Cesar, Berger Thomas, Boehm Eckart, Boettcher Stephan, Brinza David E., Burmeister Soenke, Guo Jingnan, Hassler Donald M., Posner Arik, Rafkin Scot C. R., Reitz Günther, Wilson John W., Wimmer-Schweingruber Robert F.   +20 more
doaj   +1 more source

Doomsday or Multiverse Bias

Philosophy and Phenomenological Research, EarlyView.
ABSTRACT Bayesian epistemology faces serious challenges when dealing with self‐locating evidence. This paper argues that, given two modest assumptions about how confirmation should work (Patterning and Live Centers), Bayesianism faces an unavoidable dilemma.
Yoaav Isaacs
wiley   +1 more source

Women in space: A review of known physiological adaptations and health perspectives

Experimental Physiology, EarlyView.
Abstract Exposure to the spaceflight environment causes adaptations in most human physiological systems, many of which are thought to affect women differently from men. Since only 11.5% of astronauts worldwide have been female, these issues are largely understudied.
Millie Hughes‐Fulford, Danielle J. Carroll, Heather C. M. Allaway, Bonnie J. Dunbar, Aenor J. Sawyer   +4 more
wiley   +1 more source

Spaceflight and sport science: Physiological monitoring and countermeasures for the astronaut–athlete on Mars exploration missions

Experimental Physiology, EarlyView.
Abstract Long‐duration spaceflight impacts essentially every system in the human body, resulting in multisystem deconditioning that might impair the health and performance of crewmembers, particularly on long‐duration exploration missions to Mars. In this review, we apply the sport science model of athlete monitoring, testing and training to astronauts;
Luke DeVirgiliis, Nicholas J. Goode, Kurt W. McDowell, Kirk L. English, Robert Novo, Virina Botros, Ginika Agwu, Jessica M. Scott, Lori L. Ploutz‐Snyder   +8 more
wiley   +1 more source

Surface Waves along the Martian Ionopause

Acta Physica Polonica A, 2013
We study the behaviour of surface waves propagating along the ionopause of the planet Mars and derive the onset criteria for unstable Kelvin Helmholtz modes and negative energy waves at the Martian ionopause. Growth rate of unstable Kelvin Helmholtz mode decreases with wavelength.
P. Chmielewski, K. Murawski, N. Kumar
openaire   +1 more source

Jumping on the moon as a potential exercise countermeasure

Experimental Physiology, EarlyView.
Abstract The Moon's gravitational field strength (17% Earth's gravity) may facilitate the use of bodyweight jumping as an exercise countermeasure against musculoskeletal and cardiovascular deconditioning in reduced gravity settings. The present study characterised the acute physiological and kinetic responses to bodyweight jumping in simulated Lunar ...
Patrick Swain, Filipa Santos, Luke Hughes, Dan Gordon, Nick Caplan   +4 more
wiley   +1 more source