Results 11 to 20 of about 500,833 (298)
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 +3 more
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Physical Properties of Helium and Application in Respiratory Care
Encyclopedia, 2023 Helium is a low-density, inert, monoatomic gas that is widely used in medical applications. In respiratory care, Helium is mainly used as an adjunct therapy for patients with severe upper airway obstruction and asthma.
Eric Chappel
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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 +31 more
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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 +10 more
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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 +34 more
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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 +5 more
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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 +5 more
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Proceedings of the National Academy of Sciences, 1998 The ratio 3 He/ 4 He (R) plays a central role in models of mantle evolution that propose an undegassed lower mantle, rich in the primordial isotope 3 He. A large primordial volatile-rich reservoir, a feature of recent models, is inconsistent with high-temperature ...
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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. +4 more
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The Cosmic Production of Helium [PDF]
Science, 2003 We estimate the cosmic production rate of helium relative to metals (Δ Y/ Δ Z ) using K dwarf stars in the Hipparcos catalog with accurate spectroscopic metallicities. The best fitting value is Δ Y/ Δ Z = 2.1 ± 0.4 at the 68% confidence level ...
Jimenez, Raul +3 more
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