Results 31 to 40 of about 462,957 (252)

Field Geology/Processes [PDF]

open access: yes, 1995
The field geology/processes group examined the basic operations of a terrestrial field geologist and the manner in which these operations could be transferred to a planetary lander.
Singer, Robert B.   +9 more
core  

Unoccupied Aircraft Systems Sampling for Earth and Mars

open access: yesThe Planetary Science Journal
Unoccupied aircraft systems (UAS) technology on Earth has become increasingly prevalent and accessible, and for extraterrestrial applications, the Ingenuity helicopter has proven the viability of flight on Mars.
Colin Chen   +7 more
doaj   +1 more source

Micromachined Double‐Membrane Mechanically Tunable Metamaterial for Thermal Infrared Filtering

open access: yesAdvanced Photonics Research, Volume 6, Issue 5, May 2025.
Herein, a mechanically tunable double‐layer plasmonic metamaterial leveraging the extraordinary optical transmission effect observed in subwavelength arrays of openings within thin metal layers is presented. The concept is experimentally validated by integrating the proposed metamaterial structure into an electrostatic parallel‐plate actuator to create
Oleg Bannik   +7 more
wiley   +1 more source

Long extra-tropical planetary wave propagation in the presence of slowly varying mean flow and bottom topography. II: ray propagation and comparison with observations [PDF]

open access: yes, 2003
Ray theory is used to predict phase and group velocities for long planetary waves under realistic, albeit slowly varying, oceanic conditions. The results are compared with local theory using fields smoothed to the same amount (9° latitude/longitude) as ...
Killworth, Peter D.   +9 more
core   +1 more source

Iron‐Mediated Release of Aged Dissolved Organic Carbon From Waterlogged Peatland Under Warming

open access: yesAdvanced Science, EarlyView.
This study conducts a five‐year in situ warming experiment in high‐altitude peatlands to examine dissolved organic carbon (DOC) release. The study shows that warming promotes the release of plant‐derived modern DOC in drained peatlands, but amplifies aquatic export of century‐old DOC from waterlogged peatlands via Fe‐mediated DOC mobilization—a ...
Guohua Dai   +18 more
wiley   +1 more source

Advances in planetary geology [PDF]

open access: yes, 1981
This second issue in a new series intended to serve the planetary geology community with a form for quick and thorough communications includes (1) a catalog of terrestrial craterform structures for northern Europe; (2) abstracts of results of the ...
Woronow, A.
core  

Proceedings, Fourth Forum on Geology of Industrial Minerals, March 14 and 15, 1968, Austin, Texas. Themes: I. Geology of Chemical raw materials. II. Depositional models in economic stratigraphy [PDF]

open access: yes, 1968
To obtain a print version of this publication visit: https://store.beg.utexas.edu/ and search for: SP0003.Papers in this volume were presented at the Fourth Forum on Geology of Industrial Minerals sponsored by the Bureau of Economic Geology, The ...
Brown, L. F. (Leonard Franklin), 1928-
core   +1 more source

Geomorphology and Mineralogy of Belén Crater in Iani Chaos (Mars) Point to Hydrothermal Activity

open access: yesThe Planetary Science Journal
The study of Martian chaotic terrains helps constrain the ancient geologic history of the Martian water cycle, as these regions preserve geomorphic and mineralogical evidence of catastrophic groundwater release, subsurface ice melting, and associated ...
M. C. Rojas   +3 more
doaj   +1 more source

A Global Methane Observation System to Reduce Uncertainty for Anthropogenic and Natural Sources and Sinks for Detecting and Attributing Climate Feedbacks

open access: yesAdvanced Science, EarlyView.
Conceptual illustration of a Global Ecosystem Methane Observing System (GEM‐OS) integrating satellites, aircraft, atmospheric networks, and ecosystem measurements to quantify methane emissions from anthropogenic and natural sources. The multi‐scale observing framework improves source attribution, reduces uncertainty in regional methane budgets, and ...
P. Ciais   +32 more
wiley   +1 more source

Erosion rate and previous extent of interior layered deposits on Mars revealed by obstructed landslides [PDF]

open access: yes, 2014
We describe interior layered deposits on Mars that have obstructed landslides before undergoing retreat by as much as 2 km. These landslides differ from typical Martian examples in that their toe height increases by as much as 500 m in a distinctive ...
Warner, N.H., Grindrod, Peter M.
core   +1 more source

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