Results 111 to 120 of about 67,581 (340)

Layer disturbances and the radio-echo free zone in ice sheets [PDF]

The Cryosphere, 2009
Radio-echo sounding of the Antarctic and Greenlandic ice sheets often reveals a layer in the lowest hundreds of meters above bedrock more or less free of radio echoes, known as the echo-free zone (EFZ).
R. Drews, O. Eisen, I. Weikusat, S. Kipfstuhl, A. Lambrecht, D. Steinhage, F. Wilhelms, H. Miller   +7 more
doaj  

Existence of a persistent background of turbulence [PDF]

, 1983
A plausible scenario for the existence of a persistent back-ground of turbulence in the free atmosphere is described. The MST radar technique is the only existing technique that can be used to describe the morphology of occurrence of turbulence as a ...
Vanzandt, T. E.
core   +1 more source

Unveiling Aggregation‐Induced Singlet Fission in Push–Pull Diketopyrrolopyrrole Water Dispersed Nanoaggregates and Thin Films

Advanced Functional Materials, EarlyView.
Aggregates of diketopyrrolopyrrole dipolar and quadrupolar systems exhibit panchromatic absorption spectra extending in the entire visible range. Upon aggregation in water and in the solid state, their fluorescence is almost completely quenched and their singlet excited state lifetime is significantly shortened.
Roberto Cantoni, Martina Alebardi, Eliana Maria D'Amato, Charu Popli, Yuvraj Patil, Pietro Mancini, Alessandro Di Michele, Anna Spalletti, Rajneesh Misra, Theodore Goodson, Benedetta Carlotti   +10 more
wiley   +1 more source

Prototype wireless sensors for monitoring subsurface processes in snow and firn

Journal of Glaciology, 2018
The detection and monitoring of meltwater within firn presents a significant monitoring challenge. We explore the potential of small wireless sensors (ETracer+, ET+) to measure temperature, pressure, electrical conductivity and thus the presence or ...
ELIZABETH A. BAGSHAW, NANNA B. KARLSSON, LAI BUN LOK, BEN LISHMAN, LINDSAY CLARE, KEITH W. NICHOLLS, STEVE BURROW, JEMMA L. WADHAM, OLAF EISEN, HUGH CORR, PAUL BRENNAN, DORTHE DAHL-JENSEN   +11 more
doaj   +1 more source

Multiple Twinning in Nacre and Aragonite

Advanced Functional Materials, EarlyView.
Electron backscatter diffraction map of a cluster of geologic aragonite, exhibiting single, double, and triple twins. The whole cluster is approximately 2 cm wide. Colors indicate crystal orientations, so that pixels where the a‐, b‐, and c‐axis is perpendicular to the image plane are green, red, and blue, respectively.
Connor A. Schmidt, William O. Nachlas, Bil Schneider, Xiaoming Mao, Eric Tambutté, Alexander A. Venn, Sylvie Tambutté, Pupa U. P. A. Gilbert   +7 more
wiley   +1 more source

Calibration of a mathematical model of Marukh Glacier, Western Caucasus

Лëд и снег, 2015
Considered in the paper, three-dimentsional mathematical model of dynamics of Marukh Glacier, Western Caucasus. Block structure of the model and interaction between blocs is described.
О. О. Rybak, Е. А. Rybak, S. S. Kutuzov, I. I. Lavrentiev, P. А. Morozova   +4 more
doaj   +1 more source

Acidity Levels in Ice Sheets from Radio Echo-Sounding [PDF]

Annals of Glaciology, 1982
It has been suggested (Hammer 1977, Gudmandsen and Overgaard 1978, Millar 1981) that layers of acidic ice, formed after large volcanic eruptions, are a cause of radio echo layering. The power reflection coefficient (PRO of these reflecting layers may be related to their acid content and thickness.
openaire   +1 more source

Photometric Studies of Auroral Luminosity and its Connection with Some Atmosphere Ionization Phenomena [PDF]

, 1958
The auroral radiation, 3914 AO, received from the entire sky on a horizontal diffusing plate was monitored continuously during the nights of 1955-56 and 1956-57. The 1955-56 data and part of the 1956-57 data were used to obtain a diurnal curve for the
Murcray, W. B.
core  

The effects of crustal magnetic fields and solar EUV flux on ionopause formation at Mars

, 2019
We study the ionopause of Mars using a database of 6,893 ionopause detections obtained over 11 years by the MARSIS (Mars Advanced Radar for Subsurface and Ionosphere Sounding) experiment.
Chu, F., Duru, F., Girazian, Z., Gurnett, D. A., Halekas, J., Kopf, A. J., Morgan, D. D., Thiemann, E. M. B.   +7 more
core   +1 more source

Low-frequency ionospheric sounding with Narrow Bipolar Event lightning radio emissions: regular variabilities and solar-X-ray responses [PDF]

, 2007
We present refinements of a method of ionospheric D-region sounding that makes opportunistic use of powerful (10⁹–10¹¹ W) broadband lightning radio emissions in the low-frequency (LF; 30&ndash ...
A. R. Jacobson, D. A. Smith, E. Lay, M. Heavner, R. Holzworth   +4 more
core   +3 more sources