Results 1 to 10 of about 254,221 (148)
On Grid-Generated Quantum Turbulence [PDF]
EntropyNearly homogeneous and isotropic turbulence, generated in flows through grids of various forms in wind tunnels or by towing or oscillating grids in stationary samples of classical viscous fluids and the superfluid phases of helium, have played an ...
Ladislav Skrbek
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The principles of helium exploration
Petroleum Geoscience, 2022 Commercial helium systems have been found to date as a serendipitous by-product of petroleum exploration. There are nevertheless significant differences in the source and migration properties of helium compared with petroleum.
D. Danabalan +6 more
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Physics in Medicine and Biology, 2022 Helium ion beam therapy for the treatment of cancer was one of several developed and studied particle treatments in the 1950s, leading to clinical trials beginning in 1975 at the Lawrence Berkeley National Laboratory.
A. Mairani +22 more
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Unimpeded Permeation of Water Through Helium-Leak–Tight Graphene-Based Membranes [PDF]
Science, 2011 Porous Membranes Thin semi-permeable membranes are commonly used as chemical barriers or for filtration purposes. While the size of the pores will influence which molecules are able to pass, other factors—including the surface chemistry of the pore walls,
R. Nair +4 more
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Improving helium abundance determinations with Leo P as a case study [PDF]
Journal of Cosmology and Astroparticle Physics, 2020 Currently, the primordial helium abundance is best estimated through spectroscopic observations of H II regions in metal-poor galaxies. However these determinations are limited by several systematic uncertainties which ultimately limit our ability to ...
E. Aver +5 more
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Models of helium enrichment in helium-rich gas reservoirs of petroliferous basins in China
Natural Gas Industry B, 2023 Owing to the characteristics of chemical inertness, low molecular weight, low boiling point, strong permeability and high heat conductivity, helium is extensively used in the fields of aerospace, low-temperature superconductivity, medicine and high tech,
Shengfei Qin +4 more
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The PHLEK Survey: A New Determination of the Primordial Helium Abundance [PDF]
Astrophysical Journal, 2020 We present Keck NIRSPEC and Keck NIRES spectroscopy of sixteen metal-poor galaxies that have pre-existing optical observations. The near-infrared (NIR) spectroscopy specifically targets the He i λ10830 Å emission line, due to its sensitivity to the ...
Tiffany Hsyu +3 more
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Assessing the expansion of the Cambrian Agronomic Revolution into fan-delta environments
Scientific Reports, 2022 The intensity, extent, and ecosystem-level impact of bioturbation (i.e. Agronomic Revolution) at the dawn of the Phanerozoic is a hotly debated issue.
Andrei Ichaso +4 more
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Journal of Natural Gas Geoscience, 2022 Helium, a coordinated resource in natural gas, is an essential and strategic resource, but research on its enrichment mechanism is relatively weak.
Shengfei Qin +4 more
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Nicotinamide adenine dinucleotide and the sirtuins caution: Pro‐cancer functions
Aging Medicine, 2021 This scoping review aims to perform a brief but comprehensive assessment of existing peer‐reviewed literature and determine whether raising nicotinamide adenine dinucleotide can prevent or promote tumorigenesis. The examination of extensive peer‐reviewed
Raymond D. Palmer, Mauro Vaccarezza
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