Results 71 to 80 of about 75,783 (218)

MOLYBDENUM AND RUTHENIUM ABUNDANCES IN COOL STARS OF THE GALACTIC DISC

Odessa Astronomical Publications, 2017
We  revise  the  molybdenum  and  ruthenium abundances in  FGK stars with metallicities  ranging from −1.0 < [Fe/H] < +0.3. The observed stars belong to the  substructures  of  the  Galaxy.  The  observations  were conducted using the 1.93 m telescope at
T. I. Gorbaneva, T. V. Mishenina
doaj   +1 more source

Machine Learning‐Ready Data Sets for the Analysis and Nowcasting of Atmospheric Radiation at Aviation Altitudes

Space Weather, Volume 24, Issue 3, March 2026.
Abstract Nowcasting and forecasting of the radiation environment in the Earth's lower atmosphere are critical for the safety of aircraft and spacecraft crews and passengers. Currently, this problem is addressed by employing statistical and physics‐based models that take into account particle transport and precipitation.
V. M. Sadykov, Z. M. Watkins, D. Kempton, W. Jones, S. K. C, G. T. Goodwin, X. He, W. K. Tobiska, I. Kitiashvili, C. Mertens, S. Ranjan, D. G. Deardorff, R. Spaulding   +12 more
wiley   +1 more source

From international land deals to local informal agreements: regulations of and local reactions to agricultural investments in Madagascar [PDF]

, 2011
In 2009, the 1.3 million hectare agricultural project planned in Madagascar by Daewoo Logistics exemplified the paradoxical position of the Malagasy state; simultaneously encouraging the development of large-scale acquisition and implementing a land ...
Andrianirina Ratsialonana, Rivo, Burnod, Perrine, Gingembre, Mathilde, Ratovoarinony, Raphael   +3 more
core  

GRAVITY: getting to the event horizon of Sgr A*

, 2008
We present the second-generation VLTI instrument GRAVITY, which currently is in the preliminary design phase. GRAVITY is specifically designed to observe highly relativistic motions of matter close to the event horizon of Sgr A*, the massive black hole ...
Bartko, H., Baumeister, H., Berger, J. P., Boehm, A., Brandner, W., Cassaing, F., Clenet, Y., Dodds-Eden, K., Eckart, A., Eisenhauer, F., Fedou, P., Gendron, E., Genzel, R., Gillessen, S., Graeter, A., Hamaus, N., Haubois, X., Haug, M., Henning, T., Hippler, S., Hofmann, R., Hormuth, F., Houairi, K., Jocou, L., Kellner, S., Kervella, P., Klein, R., Kolmeder, J., Lacour, S., Laun, W., Lenzen, R., Malbet, F., Naranjo, V., Neumann, U., Paumard, T., Perraut, K., Perrin, G., Pfuhl, O., Rabien, S., Ramos, J. R., Richichi, A., Rohloff, R. -R., Rouan, D., Rousset, G., Schoeller, M., Straubmeier, C., Thiel, M., Ziegleder, J.   +47 more
core   +2 more sources

Kinetic Structure of an Interplanetary Shock Observed at Two Heliocentric Longitudes

Journal of Geophysical Research: Space Physics, Volume 131, Issue 3, March 2026.
Abstract Collisionless shocks convert bulk flow energy into heat, electromagnetic fields, and non‐thermal particle populations. Recent studies suggest that downstream magnetic oscillations could play an important role in ion‐scale energy dissipation at low‐Mach‐number shocks; however, the specific shock and plasma parameters involved remain poorly ...
J. J. Boldú, D. B. Graham, M. Morooka, M. André, Yu. V. Khotyaintsev, A. Dimmock, A. Lalti, D. Píša, J. Souček, M. Maksimovic, P. Louarn, A. Fedorov, C. J. Owen   +12 more
wiley   +1 more source

Kishimoto, Satoko; Lobina, Emanuele i Petitjean, Olivier (eds.) (2015). Un futur per l’aigua pública: L’experiència mundial de la remunicipalització

Documents d'Anàlisi Geogràfica, 2017
Kishimoto, Satoko; Lobina, Emanuele i Petitjean, Olivier (eds.) (2015) Un futur per l’aigua pública: L’experiència mundial de la remunicipalització Amsterdam, Londres, París, Ciutat del Cap i Brussel·les: Transnational Institute (TNI), Public Services ...
Maria Vallès Casas
doaj   +3 more sources

Consequences of spectrograph illumination for the accuracy of radial-velocimetry

, 2010
For fiber-fed spectrographs with a stable external wavelength source, scrambling properties of optical fibers and, homogeneity and stability of the instrument illumination are important for the accuracy of radial-velocimetry. Optical cylindric fibers are
Boisse, I., Bouchy, F., Chazelas, B., Hebrard, G., Lovis, C., Pepe, F., Perruchot, S.   +6 more
core   +2 more sources

Spectral Properties and Energy Injection in Mercury's Magnetotail Current Sheet

Geophysical Research Letters, Volume 53, Issue 4, 28 February 2026.
Abstract Mercury's magnetotail hosts a thin and highly dynamic current sheet (CS), where magnetic reconnection and strong fluctuations frequently occur. Here, we statistically analyze magnetic field power spectra across 370 magnetotail CSs observed by MESSENGER.
Xinmin Li, Chuanfei Dong, Liang Wang, Sae Aizawa, Lina Z. Hadid, Chi Zhang, Hongyang Zhou, James A. Slavin, Jiawei Gao, Mirko Stumpo, Wei Zhang   +10 more
wiley   +1 more source

Asymmetries in stellar streams induced by a galactic merger

Astronomy & Astrophysics
Stellar streams are sensitive to perturbations from, for example, giant molecular clouds, bars and spiral arms, infalling dwarf galaxies, or globular clusters which can imprint gaps, clumps, spurs, and asymmetries in tails.
Guillaume Claire, Renaud Florent, Martin Nicolas F., Famaey Benoit, Di Matteo Paola, Thomas Guillaume F., Ferrone Salvatore, Ibata Rodrigo, Pagnini Giulia   +8 more
doaj   +1 more source

(SC)RMI: A (S)emi-(C)lassical (R)elativistic (M)otion (I)integrator, to model the orbits of space probes around the Earth and other planets

, 2006
Today, the motion of spacecrafts is still described according to the classical Newtonian equations plus the so-called "relativistic corrections", computed with the required precision using the Post-(Post-)Newtonian formalism.
Jean-Pierre Barriot, Pascal Rosenblatt, Soffel, Sophie Pireaux   +3 more
core   +2 more sources