Results 31 to 40 of about 601,537 (357)

Active degassing of crustal CO2 in areas of tectonic collision: A case study from the Pollino and Calabria sectors (Southern Italy)

Frontiers in Earth Science, 2022
Carbon dioxide (CO2) is released from the Earth’s interior into the atmosphere through both volcanic and non-volcanic sources in a variety of tectonic settings.
Paolo Randazzo, Antonio Caracausi, Alessandro Aiuppa, Carlo Cardellini, Carlo Cardellini, Giovanni Chiodini, Carmine Apollaro, Michele Paternoster, Michele Paternoster, Angelo Rosiello, Giovanni Vespasiano   +10 more
doaj   +1 more source

The Helium and Carbon Isotope Characteristics of the Andean Convergent Margin

Frontiers in Earth Science, 2022
Subduction zones represent the interface between Earth’s interior (crust and mantle) and exterior (atmosphere and oceans), where carbon and other volatile elements are actively cycled between Earth reservoirs by plate tectonics.
P. H. Barry, J. M. De Moor, J. M. De Moor, A. Chiodi, F. Aguilera, F. Aguilera, M. R. Hudak, D. V. Bekaert, S. J. Turner, J. Curtice, A. M. Seltzer, G. L. Jessen, G. L. Jessen, E. Osses, J. M. Blamey, M. J. Amenábar, M. Selci, M. Cascone, A. Bastianoni, M. Nakagawa, R. Filipovich, E. Bustos, M. O. Schrenk, J. Buongiorno, C. J. Ramírez, T. J. Rogers, K. G. Lloyd, D. Giovannelli, D. Giovannelli, D. Giovannelli, D. Giovannelli   +30 more
doaj   +1 more source

Helium Emissions Observed in Ground-Based Spectra of Solar Prominences [PDF]

, 2012
The only prominent line of singly ionized helium in the visible spectral range, helium-II 4686 A, is observed together with the helium-I 5015 A singlet and the helium-I 4471 A triplet line in solar prominences.
Bianda, Michele, Ramelli, Renzo, Stellmacher, Goetz, Wiehr, Eberhard   +3 more
core   +2 more sources

Doppler imaging of the helium-variable star a Cen [PDF]

, 2010
The helium-peculiar star a Cen exhibits line profile variations of elements such as iron, nitrogen and oxygen in addition to its well-known extreme helium variability.
Bagnulo, Blackwell, Bohlender, Bohlender, Borra, Brown, Catalano, D. A. Bohlender, Dimitrijevic, Fred, Glagolevskij, Gray, Hartoog, Hubeny, Hubrig, Hunger, J. B. Rice, Jaschek, Jaschek, Kochukhov, Krticka, Krticka, Kupka, Lanz, LeBlanc, Leone, Mihalas, Molnar, Norris, Norris, Norris, P. Hechler, Pedersen, Piskunov, Rice, Rice, Shavrina, Vauclair, Wolff   +38 more
core   +1 more source

High-resolution confirmation of an extended helium atmosphere around WASP-107b [PDF]

Astronomy & Astrophysics, 2019
Context. Probing the evaporation of exoplanet atmospheres is key to understanding the formation and evolution of exoplanetary systems. The main tracer of evaporation in the UV is the Lyman-α transition, which can reveal extended exospheres of neutral ...
R. Allart, V. Bourrier, C. Lovis, D. Ehrenreich, J. Aceituno, A. Guijarro, F. Pepe, D. Sing, J. Spake, A. Wyttenbach   +9 more
semanticscholar   +1 more source

The Hubble Space Telescope UV legacy survey of galactic globular clusters – XVI. The helium abundance of multiple populations [PDF]

Monthly notices of the Royal Astronomical Society, 2018
Recent work, based on data from the Hubble Space Telescope (HST) UV Legacy Survey of Galactic Globular Clusters (GCs), has revealed that all the analyzed clusters host two groups of first- (1G) and second-generation (2G) stars.
A. Milone, A. Marino, A. Marino, A. Renzini, F. D’Antona, Jay Anderson, B. Barbuy, L. Bedin, A. Bellini, T. M. Brown, S. Cassisi, G. Cordoni, E. Lagioia, D. Nardiello, S. Ortolani, G. Piotto, A. Sarajedini, M. Tailo, R. V. D. Marel, R. V. D. Marel, E. Vesperini   +20 more
semanticscholar   +1 more source

Proton and Helium Spectra from the CREAM-III Flight [PDF]

, 2017
Primary cosmic-ray elemental spectra have been measured with the balloon-borne Cosmic Ray Energetics And Mass (CREAM) experiment since 2004. The third CREAM payload (CREAM-III) flew for 29 days during the 2007–2008 Antarctic season.
Y. Yoon, T. Anderson, A. Barrau, N. Conklin, S. Coutu, L. Derome, J. Han, J. Jeon, K. C. Kim, M. H. Kim, Hyeyoung Lee, J. Lee, Moo Hyun Lee, S. Lee, J. Link, A. Menchaca-Rocha, J. Mitchell, S. Mognet, S. Nutter, I. H. Park, N. Picot-Clemente, A. Putze, E. Seo, J. Smith, J. Wu   +24 more
semanticscholar   +1 more source

Effects of Gas Pressure during Electron Beam Energy Deposition in the EBM Additive Manufacturing Process

Metals, 2021
Electron beam melting (EBM) is a metal powder bed fusion additive manufacturing (AM) technology that facilitates the production of metal parts by selectively melting areas in layers of metal powder.
Elroei Damri, Eitan Tiferet, Dor Braun, Yaron Itay Ganor, Michael Chonin, Itzhak Orion   +5 more
doaj   +1 more source

Site-selectively generated photon emitters in monolayer MoS2 via local helium ion irradiation

Nature Communications, 2019
Quantum light sources in solid-state systems are of major interest as a basic ingredient for integrated quantum photonic technologies. The ability to tailor quantum emitters via site-selective defect engineering is essential for realizing scalable ...
J. Klein, J. Klein, M. Lorke, M. Florian, F. Sigger, F. Sigger, L. Sigl, S. Rey, J. Wierzbowski, J. Cerne, K. Müller, E. Mitterreiter, P. Zimmermann, T. Taniguchi, K. Watanabe, U. Wurstbauer, U. Wurstbauer, M. Kaniber, M. Kaniber, M. Knap, R. Schmidt, J. Finley, J. Finley, A. Holleitner, A. Holleitner   +24 more
semanticscholar   +1 more source

Reducing the hydrogen content in liquid helium [PDF]

, 2020
Helium has the lowest boiling point of any element in nature at normal atmospheric pressure. Therefore, any unwanted substance like impurities present in liquid helium will be frozen and will be in solid form. Even if these solid impurities can be easily eliminated by filtering, liquid helium may contain a non-negligible quantity of molecular hydrogen.
arxiv   +1 more source