نتایج جستجو برای: noble gases
تعداد نتایج: 50564 فیلتر نتایج به سال:
Hashizume et al. (1) claim that the distribution and isotopic composition of nitrogen in the lunar regolith can be explained by a two-component mixing model. Their report, however, fails to discuss the bulk of existing relevant data— data that show unequivocally that the conclusions in (1) cannot be correct. Although the data, derived by several different groups on many different samples using ...
An experimental system we developed combines triaxial rock deformation and mass spectrometry to measure noble gas flow before, during, and after rock fracture. Gas flow through a granite and basalt in its unfractured condition allows estimation of “native” permeability. Geogenic noble gas is released during triaxial deformation (real time) and is related to volume strain and acoustic emissions....
Introduction The noble gas xenon exerts neuroprotective effects after various insults, but availability of xenon is limited. Helium and argon are readily available noble gases, but the results of studies using helium as neuroprotective measure are mixed, and the effects of argon are less well studied. In a recent cardiac arrest (CA) study, 70% argon (in O2) administered for 1 hour post CA impro...
PURPOSE To present a physical model for intraocular absorption of an inert gas used as a tamponade. METHODS The absorption kinetics of gas in contact with the retinal surface is examined, including the changing geometry of the shrinking gas bubble inside the eye. RESULTS An analytic solution is derived that predicts how the bubble dimensions change with time, yielding a formula for the life...
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