Results 51 to 60 of about 386,900 (206)
Direct Monte Carlo simulation of nanoscale mixed gas bearings
Advances in Mechanical Engineering, 2015 The conception of sealed hard drives with helium gas mixture has been recently suggested over the current hard drives for achieving higher reliability and less position error.
Kyaw Sett Myo +4 more
doaj +1 more source
Pulsed extraction of ionization from helium buffer gas [PDF]
, 2008 The migration of intense ionization created in helium buffer gas under the influence of applied electric fields is considered. First the chemical evolution of the ionization created by fast heavy-ion beams is described.
Beaty +34 more
core +1 more source
Helium-Abundance and Other Composition Effects on the Properties of Stellar Surface Convection in Solar-like Main-sequence Stars [PDF]
, 2013 We investigate the effect of helium abundance and $\alpha$-element enhancement on the properties of convection in envelopes of solar-like main-sequence stars stars using a grid of 3D radiation hydrodynamic simulations. Helium abundance increases the mean molecular weight of the gas, and alters opacity by displacing hydrogen.
arxiv +1 more source
Non-Sticking of Helium Buffer Gas to Hydrocarbons [PDF]
, 2014 Lifetimes of complexes formed during helium-hydrocarbon collisions at low temperature are estimated for symmetric top hydrocarbons. The lifetimes are obtained using a density-of-states approach. In general the lifetimes are less than 10-100 ns, and are found to decrease with increasing hydrocarbon size.
arxiv +1 more source
Journal of Natural Gas Geoscience, 2020 Based on the study of the geological background, it is considered that the main factors affecting helium enrichment in the northern margin of the Qaidam Basin (NMQB) are widely distributed rock masses, developed fractures, groundwater system, and more ...
Wei Han +7 more
doaj
Hydrodynamics in a cocurrent gas-liquid trickle bed at elevated pressures [PDF]
, 1991 Data on design and operation of trickle beds at elevated pressures are scarce. In this study the influence of the gas density on the liquid holdup, the pressure drop, and the transition between trickle and pulse flow has been investigated in a tricklebed
de Baas, C.M. +6 more
core +3 more sources
Using the helium triplet as a tracer of the physics of giant planet outflows [PDF]
Hydrodynamic outflows, such as those observed escaping close-in gas giant planets, are not isothermal in structure. Their highly ionized nature allows them to cool adiabatically at distances beyond several planetary radii. The contrast between the hottest gas temperatures at around 10,000K and the coldest at around 1,000K triggers an excess population ...
arxiv +1 more source
Journal of Natural Gas Geoscience, 2017 Crust-derived helium is generated from the radioactive decay of uranium, thorium and other radioactive elements in geological bodies. Compared with conventional natural gas, helium is a typical weak source gas as a result of extremely slow generation ...
Yuhong Li +5 more
doaj
Kvasný průmysl, 2013 Gas chromatography often uses helium, hydrogen, and nitrogen as carrier gases. The most common carrier gas is helium since it provides good separations, is inert, and is safe to use.
Tomáš HORÁK +3 more
doaj +1 more source
Reconstructing patchy helium reionization using the cosmic microwave background and large-scale structure [PDF]
arXiv, 2023 The intergalactic helium became fully ionized by the end of cosmic noon ($z\sim2$). Similarly to the reionization of hydrogen, helium reionization is expected to be patchy, driven by luminous quasars that ionize the intergalactic gas in their surrounding environment.
arxiv