Results 61 to 70 of about 676,534 (379)
Neutrino Degeneracy and Chemically Inhomogeneous Universe [PDF]
, 1999 A possibility that the universe may be strongly inhomogeneous chemically, while very smooth energetically, is considered. A possible mechanism which could lead to such a picture is a large and inhomogeneous lepton asymmetry.
Dolgov, A. D.
core +3 more sources
Advanced Functional Materials, EarlyView.The separation of Helium gas from natural gas is challenging but highly important. MIL‐116(Ga), a “non‐porous” metal–organic framework is used as a molecular sieve to separate He from CH4. Druse‐like MIL‐116(Ga) particles are integrated into polysulfone mixed matrix membranes.
Ayisha Komal +10 more
wiley +1 more source
Properties of Dense Fluid Hydrogen and Helium in Giant Gas Planets
, 2006 Equilibrium properties of hydrogen-helium mixtures under thermodynamic conditions found in the interior of giant gas planets are studied by means of density functional theory molecular dynamics simulations.
Burrows +14 more
core +2 more sources
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
openaire +5 more sources
Advanced Functional Materials, EarlyView.The fabrication of patterned transition metal dichalcogenide (TMD)/graphene heterostructures via direct laser writing reveals new interface chemistry and enables efficient, customizable assembly. Selective laser irradiation of functionalized TMD/graphene triggers localized reactions, forming chemically modified interfaces.
Xin Chen +12 more
wiley +1 more source
Helium enrichment theory and exploration ideas for helium-rich gas reservoirs
Petroleum Exploration and DevelopmentUsing gas and rock samples from major petroliferous basins in the world, the helium content, composition, isotopic compositions and the U and Th contents in rocks are analyzed to clarify the helium enrichment mechanism and distribution pattern and the ...
Shengfei QIN +8 more
doaj +1 more source
A comparative study of single-particle cryo-EM with liquid-nitrogen and liquid-helium cooling
IUCrJ, 2019 Radiation damage is the most fundamental limitation for achieving high resolution in electron cryo-microscopy (cryo-EM) of biological samples. The effects of radiation damage are reduced by liquid-helium cooling, although the use of liquid helium is more
Olivia Pfeil-Gardiner +3 more
doaj +1 more source
Неотложная медицинская помощь, 2021 Introduction. Treatment of respiratory failure in pneumonia caused by coronavirus infection (COVID-19) is still an unsolved problem that requires a comprehensive approach and the development of new methods that expand the range of possibilities of modern
R. E. Lakhin +6 more
doaj +1 more source
Microscopic two-fluid theory of rotational constants of the OCS-H$_2$ complex in $^4$He droplets
, 2003 We present a microscopic quantum analysis for rotational constants of the OCS-H$_2$ complex in helium droplets using the local two-fluid theory in conjunction with path integral Monte Carlo simulations.
K. Birgitta Whaley +2 more
core +1 more source
Helium Atmospheres on Warm Neptune- and Sub-Neptune-Sized Exoplanets and Applications to GJ 436 b [PDF]
, 2015 Warm Neptune- and sub-Neptune-sized exoplanets in orbits smaller than Mercury's are thought to have experienced extensive atmospheric evolution. Here we propose that a potential outcome of this atmospheric evolution is the formation of helium-dominated ...
Hu, Renyu, Seager, Sara, Yung, Yuk L.
core +3 more sources