Results 41 to 50 of about 31,376 (304)

Layer optimized SAR processing and slope estimation in radar sounder data

Journal of Glaciology, 2019
Englacial layers in Antarctica and Greenland are indicators of the dynamic, rheological and subglacial configuration of the ice sheets. Airborne radar sounder data is the primary remote sensing solution for directly observing englacial layers and ...
Davide Castelletti, Dustin M. Schroeder, Elisa Mantelli, Andrew Hilger   +3 more
doaj   +1 more source

Polarization Changes of Radio Signals in Vertical Radio-Echo Sounding of Glaciers [PDF]

Journal of Glaciology, 1975
An electromagnetic linearly-polarized signal transmitted through the glacier in a vertical direction, reflected from the bedrock, and received with a receiving antenna, is found to be changed into one either partially or elliptically polarized. The polarization changes are believed to be due mainly to the crystal structure of the glacier and anisotropy
V. V. Bogorodskiy, G. V. Trepov, B. A. Fedorov   +2 more
openaire   +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

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

Mycobacterial cell division arrest and smooth‐to‐rough envelope transition using CRISPRi‐mediated genetic repression systems

FEBS Open Bio, EarlyView.
CRISPRI‐mediated gene silencing and phenotypic exploration in nontuberculous mycobacteria. In this Research Protocol, we describe approaches to control, monitor, and quantitatively assess CRISPRI‐mediated gene silencing in M. smegmatis and M. abscessus model organisms.
Vanessa Point, Wafaa Achache, Janïs Laudouze, Eliana Sepulveda Ramos, Mickaël Maziero, Céline Crauste, Stéphane Canaan, Pierre Santucci   +7 more
wiley   +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

The WISDOM Radar: Unveiling the Subsurface Beneath the ExoMars Rover and Identifying the Best Locations for Drilling [PDF]

, 2017
The search for evidence of past or present life on Mars is the principal objective of the 2020 ESA-Roscosmos ExoMars Rover mission. If such evidence is to be found anywhere, it will most likely be in the subsurface, where organic molecules are shielded ...
Alain Herique, Alice Le Gall, Cathy Quantin-Nataf, Dirk Plettemeier, Elena Pettinelli, Essam Heggy, Gunes-Lasnet S., Hamadi A., Jean-Jacques Berthelier, Jorge L. Vago, Joudrier L., Kao K.C., Le Gall A., Lu Y., Paar G., Pettinelli E., Sophie Dorizon, Stephen Clifford, Stillman D.E., Stillman D.E., Stillman D.E., Susanne Schwenzer, Svein-Erik Hamran, the WISDOM Team, , Tzanis A., Tzanis A., Valérie Ciarletti, Wilkins D.E., Wlodek Kofman, Wolf-Stefan Benedix, Yann Hervé, Yee K.S., Yoshikawa K., Zhang H.   +33 more
core   +3 more sources

Characterization of Defect Distribution in an Additively Manufactured AlSi10Mg as a Function of Processing Parameters and Correlations with Extreme Value Statistics

Advanced Engineering Materials, EarlyView.
Predicting extreme defects in additive manufacturing remains a key challenge limiting its structural reliability. This study proposes a statistical framework that integrates Extreme Value Theory with advanced process indicators to explore defect–process relationships and improve the estimation of critical defect sizes. The approach provides a basis for
Muhammad Muteeb Butt, Varma Kvvssn, Hossein Laieghi, Zia Uddin, Peyman Ansari, E. Kıvanç Sadak, Can Barış Toprak, Hüseyin Kızıl, Enrico Salvati   +8 more
wiley   +1 more source