Results 31 to 40 of about 695,127 (377)
The European Physical Journal D, 2013 Using a configuration-interaction variational method, we accurately compute the reduced, single-electron von Neumann entropy for several low-energy, singlet and triplet eigenstates of helium atom. We estimate the amount of electron-electron orbital entanglement for such eigenstates and show that it decays with energy.
Giuliano Benenti +3 more
openaire +5 more sources
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 +30 more
doaj +1 more source
Spectrally resolved helium absorption from the extended atmosphere of a warm Neptune-mass exoplanet [PDF]
Science, 2018 Helium escaping from hot gas giants Many gas giant exoplanets orbit so close to their host star that they are heated to high temperatures, causing atmospheric gases to escape.
R. Allart +12 more
semanticscholar +1 more source
The ionization of helium by neutral helium atoms [PDF]
Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1946 A method is described for investigating the ionization produced in helium by collisions between quasi-stationary atoms—that is, atoms possessing only therm al velocities—and a beam of neutral helium atoms with kinetic energy less than 100 eV. Ionization is shown to begin when the kinetic energy of the bombarding atoms is twice as great as the minimum ...
Frank Horton, Dorothy M. Millest
openaire +3 more sources
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 +9 more
semanticscholar +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 +2 more
doaj +1 more source
European Journal of Materials, 2022 The utilisation of helium as process gas in laser powder bed fusion limits the generation of Ti-6Al-4V hot and incandescent spatters and enhances their cooling rate.
Camille Pauzon +7 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 +3 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 +31 more
core +3 more sources
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 +20 more
semanticscholar +1 more source