Titlebook: Excitations in Two-Dimensional and Three-Dimensional Quantum Fluids; A. F. G. Wyatt,H. J. Lauter Book 1991 Plenum Press, New York 1991 Cou

换话题

Towards a Unified Description of Bulk Excitations and the Two Fluid Theory of Superfluids in Terms between He atoms. When such a theory is achieved it will for instance be able to describe the critical behavior near the lambda temperature as well as the propagation and attenuation of second sound. Towards the goal of achieving this theory we would like to outline our picture of how such a theory might be constructed.

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低能儿

Ablation

Formation and Evolution of Solids in Spaceto deduce the main features of the variation of the dispersion curve with pressure in surprising detail. Furthermore, the results of the analysis provide a new perspective on the behavior of helium for positive pressure.

conjunctiva

Sansar C. Sharma,James W. Fawcettground state T→ 0 their lifetime becomes infinite, as put to evidence by ballistic photon/roton experiments.. In contrast the q ≤ q. phonons must have a finite lifetime at T→ 0 and we shall present the first quantitative observation of this phenomenon.

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theta-waves

fatuity

energy through scattering by Phonons [3] and Rotons [3], and hence leave the container. We have measured the spectrum of these upscattered neutrons by using a pseudo statistical chopper [4]. The first preliminary measurements show a discrepancy with the spectrum expected on the basis of phonon and roton scattering.

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V. I. Ferronsky,S. V. Ferronsky recent experiments with more dilute mixtures . showed the heat conductivity k. to depart from predictions for X ≤ 5×10.. Furthermore the thermal relaxation times τ also showed an anomalous behavior 6,7). This stimulated further measurements of k., τ and also of the thermal diffusion ratio k.* which we report in this paper.

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