Results 11 to 20 of about 497,436 (275)

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

Rb*He_n exciplexes in solid 4_He [PDF]

, 2006
We report the observation of emission spectra from Rb*He_n exciplexes in solid 4He. Two different excitation channels were experimentally identified, viz., exciplex formation via laser excitation to the atomic 5P3/2 and to the 5P1/2 levels.
Hofer, A., Moroshkin, P., Nettels, D., Ulzega, S., Weis, A.   +4 more
core   +2 more sources

Cavitation pressure in liquid helium [PDF]

, 2001
Recent experiments have suggested that, at low enough temperature, the homogeneous nucleation of bubbles occurs in liquid helium near the calculated spinodal limit. This was done in pure superfluid helium 4 and in pure normal liquid helium 3. However, in
B. M. Abraham, B. M. Abraham, C. E. Campbell, D. M. Jezek, F. Caupin, F. Caupin, F. Caupin, F. Dalfovo, G. H. Bauer, G. W. Waters, H. J. Maris, H. J. Maris, H. Lambaré, J. A. Nissen, J. Boronat, J. C. Wheatley, J. Casulleras, J. Wilks, K. Dransfeld, Lord Rayleigh, M. A. Solis, M. Guilleumas, M. Guilleumas, M. Kollar, M. P. Bertinat, P. Roche, S. Balibar, S. Balibar, S. Balibar, S. N. Burmistrov, W. H. Press, X. Chavanne   +31 more
core   +3 more sources

Monitoring Scheme for the Detection of Hydrogen Leakage from a Deep Underground Storage. Part 1: On-Site Validation of an Experimental Protocol via the Combined Injection of Helium and Tracers into an Aquifer

Applied Sciences, 2020
Massive underground storage of hydrogen could be a way that excess energy is produced in the future, provided that the risks of leakage of this highly flammable gas are managed. The ROSTOCK-H research project plans to simulate a sudden hydrogen leak into
Stéphane Lafortune, Philippe Gombert, Zbigniew Pokryszka, Elodie Lacroix, Philippe de Donato, Nevila Jozja   +5 more
doaj   +1 more source

Electric-field-induced helium-helium resonances

Physical Review A, 2019
The tunability of the helium-helium interaction through an external electric field is investigated. For a static external field, electric-field induced resonances and associated electric-field induced bound states are calculated for the $^4$He-$^4$He, $^3$He-$^4$He, and $^3$He-$^3$He systems. Qualitative agreement is found with the literature for the $^
Guan, Qingze, Blume, Doerte
openaire   +3 more sources

Free-energy model for fluid helium at high density [PDF]

, 2004
We present a semi-analytical free-energy model aimed at characterizing the thermodynamic properties of dense fluid helium, from the low-density atomic phase to the high-density fully ionized regime. The model is based on a free-energy minimization method
Christophe Winisdoerffer, G. Chabrier, Gilles Chabrier, L. Landau   +3 more
core   +2 more sources

The helium trimer with soft-core potentials [PDF]

, 2011
The helium trimer is studied using two- and three-body soft-core potentials. Realistic helium-helium potentials present an extremely strong short-range repulsion and support a single, very shallow, bound state.
A. Kievsky, A. Kievsky, A.K. Motovilov, A.R. Holt, A.R. Janzen, B.D. Esry, C. Romero-Redondo, C. Romero-Redondo, E. Garrido, E. Nielsen, E. Nielsen, E.A. Kolganova, E.A. Kolganova, F. Luo, F.E. Harris, H. Suno, J. Stecher von, K.T. Tang, M. Jeziorska, M. Lewerenz, M.V. Zhukov, P. Barletta, P. Barletta, P. Barletta, P. Barletta, R. Grisenti, R.A. Aziz, R.A. Aziz, T. Korona, V. Efimov, V. Efimov, V. Roudnev, W. Cencek, W. Schoellkopf, W. Schollkopf   +34 more
core   +3 more sources

Volatile‐Rich Hydrothermal Plumes Over the Southern Central Indian Ridge, 24°49’S: Evidence for a New Hydrothermal Field Hosted by Ultramafic Rocks

Geochemistry, Geophysics, Geosystems, 2022
Water column physico‐chemical studies were conducted over the southern Central Indian Ridge between 24°44’S and 25°52’S to identify and chemically characterize seafloor hydrothermal activity.
L. Surya Prakash, P. John Kurian, J. A. Resing, U. Tsunogai, A. Srinivas Rao, K. Sen, J. E. Lupton, T. Baumberger, A. Prajith, P. Roy   +9 more
doaj   +1 more source

Neonatal Applications of Heliox: A Practical Review

Frontiers in Pediatrics, 2022
Heliox is a mixture of helium and oxygen that may be utilized as an alternative to air-oxygen during the ventilatory support in the neonate. Special physical properties of Heliox, particularly low density, allow for improved gas flow and diffusion. First
Tomasz Szczapa, Patryk Kwapień, T. Allen Merritt   +2 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