Results 41 to 50 of about 386,900 (206)
An application of gap regenerator/expander precooled by two stage G-M refrigerator [PDF]
, 1983 The degradation of regenerator effectiveness below 10K is due to the imbalance of the heat capacity of the regenerator material and helium gas as a working fluid.
Matsubara, Y., Yasukochi, K.
core +1 more source
Laser Cooling of Dense Rubidium-Noble Gas Mixtures via Collisional Redistribution of Radiation
, 2012 We describe experiments on the laser cooling of both helium-rubidium and argon-rubidium gas mixtures by collisional redistribution of radiation. Frequent alkali-noble gas collisions in the ultradense gas, with typically 200\,bar of noble buffer gas ...
Saß, Anne, Vogl, Ulrich, Weitz, Martin
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AIP Advances, 2020 In this work, the bacteria inactivation using the nonthermal atmospheric pressure plasma has been studied. The bacteria inactivation was conducted using a self-design nonthermal atmospheric pressure plasma jet system.
Khaled Lotfy
doaj +1 more source
Cryogenic filter method produces super-pure helium and helium isotopes [PDF]
, 1964 Helium is purified when cooled in a low pressure environment until it becomes superfluid. The liquid helium is then filtered through iron oxide particles.
Hildebrandt, A. F.
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Ideal Bose gas in fractal dimensions and superfluid $^4$He in porous media
, 1999 Physical properties of ideal Bose gas with the fractal dimensionality between D=2 and D=3 are theoretically investigated. Calculation shows that the characteristic features of the specific heat and the superfluid density of ideal Bose gas in fractal ...
Bowley R H +12 more
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Helium preenrichment in the star-forming regions [PDF]
Mon.Not.Roy.Astron.Soc.Lett. 369 (2006) L52-L55, 2006 We show that element diffusion can produce large fluctuations in the initial helium abundance of the star-forming clouds. Diffusion time-scale, which in stars is much larger than the Hubble time, can fall below 10^8 years in the neutral gas clouds dominated by collisionless dark matter or with dynamically important radiation or magnetic pressure ...
arxiv +1 more source
Helium additions to MIG shielding gas - an economic option? [PDF]
, 2011 An investigation has been carried out to establish the technical and economic benefits of adding two levels of helium to a normal shielding gas. Technically no adverse issues were established using the two levels of helium, and the most significant ...
Galloway, Alexander +2 more
core
Arc pressure and weld metal fluid flow whilst using alternating shielding gases Part 1 : arc pressure measurement [PDF]
, 2013 As part of an ongoing process to fully evaluate the effects of an alternating shielding gas supply on gas shielded welding processes, a comparison between the arc pressures generated using argon, helium, alternating shielding gases and pulsed GTAW has ...
Campbell, Stuart +2 more
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Intercalating Helium into A-site Vacant Perovskites [PDF]
arXiv, 2023 Evolutionary searches were employed to predict the most stable structures of perovskites with helium atoms on their A-sites up to pressures of 10 GPa. The thermodynamics associated with helium intercalation into [CaZr]F6, structure that [He]2[CaZr]F6 adopts under pressure, and the mechanical properties of the parent perovskite and helium-bearing phase ...
arxiv
High-Spatial-Resolution Helium Detection and Its Implications for Helium Accumulation Mechanisms
Applied SciencesHelium is a scarce strategic resource. Currently, all economically valuable helium resources are found in natural gas reservoirs. Owing to helium’s different formation and migration processes compared to natural gas’s, the traditional method of ...
Chao Lu +5 more
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