Zobrazeno 1 - 10
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pro vyhledávání: '"Humphrey J"'
Autor:
Humphrey J. Maris
Publikováno v:
Journal of Low Temperature Physics. 155:290-302
In this note we report on simple estimates of the properties of metastable solid helium that is at a pressure below the normal melting pressure. We calculate the nucleation rate for formation of the liquid phase and estimate the “spinodal” pressu
Autor:
Humphrey J. Maris, Sébastien Balibar
Publikováno v:
Journal of Low Temperature Physics. 147:539-547
The specific heat of solid helium in the temperature range below about 1.2 K has been found to contain a term varying as T 7, in addition to the usual T 3 contribution always found in a crystalline dielectric solid. It has been proposed by Anderson,
Publikováno v:
Journal of Low Temperature Physics. 134:227-235
We give a survey of recent experimental and theoretical work on the effect of light on electron bubbles in liquid helium. The light-induced change in the bubbles is measured using an ugtrasonic technique. In helium at temperatures above about 1.7 K,
Publikováno v:
Physica B: Condensed Matter. :356-359
We review the present understanding of liquid helium outside its usual stability range. Most theoretical predictions and experiments concern the negative pressure region, where the phenomenon of cavitation has to be considered in relation with the ex
Autor:
Humphrey J. Maris, Frédéric Caupin
Publikováno v:
Journal of Low Temperature Physics. 131:145-154
We consider the homogenous nucleation of solid helium from the liquid phase at pressures above the normal freezing pressure. We find that if the liquid-solid surface energy α is assumed to be independent of pressure, then at 1 K nucleation should oc
Publikováno v:
Journal of Low Temperature Physics. 114:523-545
We present an analysis of the small amplitude shape oscillations of a superfluid helium drop surrounded by saturated helium vapor. The equations of the two-fluid model are used to describe the liquid motion within the drop. The calculations are perfo
Autor:
Humphrey J. Maris, Quan Xiong
Publikováno v:
Journal of Low Temperature Physics. 81:167-170
Alekseeva and Krupskii1 have reported the observation of the plastic flow of solid hydrogen under the influence of gravity. We describe here an attempt to repeat this experiment. No measurable flow was observed.
Autor:
Humphrey J. Maris
Publikováno v:
Journal of Physics: Conference Series. 400:012041
Helium can be prepared with a purity much higher than any other element. As a consequence, it is an ideal material in which to study nucleation processes. We describe work in which liquid helium has been studied at pressures below the pressure range
Publikováno v:
Physical review. B, Condensed matter. 41(10)
Pour l'hydrogene dans les echantillons ayant des grands pores, en absence une transition de congelation. Dans les echantillons ayant de petits pores, il n'y a aucune caracteristique qui peut etre associee a une transition liquide-solide. La capacite
Autor:
Humphrey J. Maris, Rodney H. Torii
Publikováno v:
Review of Scientific Instruments. 57:655-657
A new type of low‐temperature heat switch is described. The switch uses unforced convection of helium gas within a closed loop. We report measurements of the performance of a simple version of the heat switch.