Results 341 to 350 of about 695,127 (377)
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American Association of Petroleum Geologists Bulletin, 2019
Helium and nitrogen variations in Panhandle–Hugoton field (PHF) gases are products of interaction between hydrocarbon gas from the Anadarko basin and at least two water masses with dissolved nitrogen and helium.
Alton A. Brown
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Helium and nitrogen variations in Panhandle–Hugoton field (PHF) gases are products of interaction between hydrocarbon gas from the Anadarko basin and at least two water masses with dissolved nitrogen and helium.
Alton A. Brown
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Isotherms of helium at liquid helium temperatures
Physica, 1939Abstract The authors determined isotherms of helium at liquid helium temperatures, up to densities near those of the saturated vapour. Table II gives the virial coefficients. The second virial coefficient, B, is compared with the results of computations made by Massey and Buckingham, by De Boer and Michels, and by Gropper.
W.K. Walstra, W.H. Keesom
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Precision spectroscopy of helium in a magic wavelength optical dipole trap
Nature Physics, 2018Improvements in both theory and frequency metrology of few-electron systems such as hydrogen and helium have enabled increasingly sensitive tests of quantum electrodynamics, as well as ever more accurate determinations of fundamental constants and the ...
R. Rengelink +7 more
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Physical Review, 1946
A helium cryostat which is cooled by the isentropic expansion of helium without the aid of liquid air or other refrigerant provides a cold chamber for experiments at any temperature down to 2°K. Any gas can be liquefied and delivered to external receivers as desired. Three expansion devices are described. One is a diaphragm engine having a mechanically
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A helium cryostat which is cooled by the isentropic expansion of helium without the aid of liquid air or other refrigerant provides a cold chamber for experiments at any temperature down to 2°K. Any gas can be liquefied and delivered to external receivers as desired. Three expansion devices are described. One is a diaphragm engine having a mechanically
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Nature Chemistry, 2012
Owing to peculiar properties, helium has taken both the main and supporting roles in scientific discoveries over the years. Christine Herman explores just what makes it such a cool element.
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Owing to peculiar properties, helium has taken both the main and supporting roles in scientific discoveries over the years. Christine Herman explores just what makes it such a cool element.
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Physical Review, 1962
BS>The integrated electric dipole absorption cross section sigma /sub int/ and bremsstrahlung-weighted cross section sigma /sub b/ are calculated for He/sup 4/. By using a two-body interaction operator having a Serber exchange character with a repulsive core and tensor component, it is found that sigma / sub int/ = 107 Mev-mb and sigma /sub b/ = 2.73 ...
Paul Goldhammer, Henry S. Vaulk
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BS>The integrated electric dipole absorption cross section sigma /sub int/ and bremsstrahlung-weighted cross section sigma /sub b/ are calculated for He/sup 4/. By using a two-body interaction operator having a Serber exchange character with a repulsive core and tensor component, it is found that sigma / sub int/ = 107 Mev-mb and sigma /sub b/ = 2.73 ...
Paul Goldhammer, Henry S. Vaulk
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Helium-3 in Superfluid Helium-4 [PDF]
, 1974 This paper is not intended to be a review nor is there sufficient time or space to give an adequate introduction to the work which will be described in the many contributed papers at the conference, so I will confine myself to some topics that have interested our group at Ohio State.
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Physica B+C, 1984
Abstract The paper will first give an overview of important technological issues relating to the precipitation of helium gas bubbles in materials subjected to radiation damage in nuclear reactors. These are the phenomena of swelling, blistering, flaking, radiation creep and He embrittlement.
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Abstract The paper will first give an overview of important technological issues relating to the precipitation of helium gas bubbles in materials subjected to radiation damage in nuclear reactors. These are the phenomena of swelling, blistering, flaking, radiation creep and He embrittlement.
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Viscosity of Helium I and Helium II
Nature, 1935DETERMINATIONS have recently been made in the Cryogenic Laboratory at Toronto of the viscosity of liquid helium in its two states, helium I and helium II.
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NONLOCALITY IN (HELIUM-HELIUM) INTERATOMIC POTENTIALS
1976Publisher Summary This chapter highlights the nonlocality in interactomic potentials. Interatomic potentials are usually taken to be purely local. With this assumption, the potential is obtained through the use of Born–Oppenheimer approximation. This usually leads to a long range attractive van der Waals' potential and a short range steep repulsion ...
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