Results 41 to 50 of about 31,420 (299)

Deep multi-scale learning for automatic tracking of internal layers of ice in radar data

Journal of Glaciology, 2021
In this study, our goal is to track internal ice layers on the Snow Radar data collected by NASA Operation IceBridge. We examine the application of deep learning methods on radar data gathered from polar regions.
Maryam Rahnemoonfar, Masoud Yari, John Paden, Lora Koenig, Oluwanisola Ibikunle   +4 more
doaj   +1 more source

Airborne radio echo sounding on the Shirase Glacier and its drainage basin, East Antarctica

Antarctic Record, 1981
Airborne radio echo sounding carried out on the Shirase Glacier and its drainage basin in January 1980 is described. The new sounder (NIPR-A) was operated at 179 MHz on board a Pilatus Porter PC-6.
Makoto Wada, Shinji Mae
doaj   +1 more source

Dielectric properties of soils and assessment of their hydrothermal state under snow cover based on radio-echo sounding data

Лëд и снег, 2022
Snow cover significantly affects the thermal regime of the underlying soils, and its assessment and monitoring are an urgent task of remote sensing studies.
Yu. Ya. Macheret, A. V. Sosnovsky, A. F. Glazovsky   +2 more
doaj   +1 more source

A compact lightweight multipurpose ground-penetrating radar for glaciological applications

, 2011
We describe a compact lightweight impulse radar for radio-echo sounding of subsurface structures designed specifically for glaciological applications. The radar operates at frequencies between 10 and 75 MHz.
Frolovskiy, K., Lapazaran Izargain, Javier Jesús, Machío, F., Navarro Valero, Francisco Jose, Vasilenko, Evgeniy   +4 more
core   +2 more sources

A revised inventory of Antarctic subglacial lakes [PDF]

, 2005
The locations and details of 145 Antarctic subglacial lakes are presented. The inventory is based on a former catalogue of lake-type features, which has been subsequently reanalysed, and on the results from three additional datasets.
Blankenship, Donald D., Carter, Sasha, Popov, Sergey, Siegert, Martin, Tobacco, Ignazio   +4 more
core   +1 more source

Revealing the structure of land plant photosystem II: the journey from negative‐stain EM to cryo‐EM

FEBS Letters, EarlyView.
Advances in cryo‐EM have revealed the detailed structure of Photosystem II, a key protein complex driving photosynthesis. This review traces the journey from early low‐resolution images to high‐resolution models, highlighting how these discoveries deepen our understanding of light harvesting and energy conversion in plants.
Roman Kouřil
wiley   +1 more source

Effects of the passage of Comet C/2013 A1 (Siding Spring) observed by the Shallow Radar (SHARAD) on Mars reconnaissance orbiter [PDF]

, 2015
The close passage of Comet C/2013 A1 (Siding Spring) to Mars provided a unique opportunity to observe the interaction of cometary materials with the Martian ionosphere and atmosphere using the sounding radar SHARAD (SHAllow RADar) aboard Mars ...
Anthony Egan, Benna, Bruce A. Campbell, Campbell, Campbell, Cartacci, Croci, Daniel Nunes, Fabrizio Bernardini, Garner, Grebowsky, Gronoff, Gurnett, Jeffrey J. Plaut, Kelley, Kelly, Marco Restano, Pesnell, Restano, Roberto Seu, Roger J. Phillips, Safaeinili, Safaeinili, Schneider, Seu, Seu, Tricarico, Withers, Yelle, Yonggyu Gim   +29 more
core   +1 more source

Radio Echo-Sounding of Riiser-Larsenisen (Abstract only) [PDF]

Annals of Glaciology, 1982
The Norwegian Antarctic Research Expedition 1978–79 used the Scott Polar Research Institute Mk IV radio echo-sounding system fitted in a Bell 206B helicopter to survey 620 km of Riiser-Larsenisen and 100 km across the outer part of Stancomb-Wills Ice Stream.
openaire   +1 more source

Gut microbiome and aging—A dynamic interplay of microbes, metabolites, and the immune system

FEBS Letters, EarlyView.
Age‐dependent shifts in microbial communities engender shifts in microbial metabolite profiles. These in turn drive shifts in barrier surface permeability of the gut and brain and induce immune activation. When paired with preexisting age‐related chronic inflammation this increases the risk of neuroinflammation and neurodegenerative diseases.
Aaron Mehl, Eran Blacher
wiley   +1 more source

USAP 1989 Cruise IV R/V Polar Duke, Cruise Report [PDF]

, 1989
This is a report for the 1989 R/V Polar Duke scientific cruise, PD IV-89 (also known as PD8904), around the Antarctic Peninsula. The cruise collected single-channel seismic data, piston cores, and heatflow data.National Science Foundation's Office of ...
Lawver, Lawrence A.
core   +1 more source