Beschreibung
The 13th International Conference on Low Temperature Physics, organized by the National Bureau of Standards, Los Alamos Scientific Laboratory, and the University of Colorado, was held in Boulder, Colorado, August 21 to 25, 1972, and was sponsored by the National Science Foundation, the U. S. Army Office of Scientific Research, the U. S. Atomic Energy Commission, the U. S. Navy Office of Naval Research, the International Institute of Refrigeration, and the Internation al Union of Pure and Applied Physics. This international conference was the latest in a series of biennial conferences on low temperature physics, the first of which was held at the Massachusetts Institute of Technology in 1949. (For a complete list of previous L T conferences see p. viii. Many of these past conferences have been coordinated and sponsored by the Commission on Very Low Temperatures of IUPAP. Subsequent LT conferences will be scheduled triennially beginning in 1975. LT 13 was attended by approximately 1015 participants from twenty five countries. Eighteen plenary lectures and 550 contributed papers were presented at the Conference. The Conference began with brief introductory and welcoming remarks by Dr. R. H. Kropschot on behalf of the Organizing Committee, Professor J. Bardeen on behalf of the Commission on Very Low Temperatures of the IUP AP, and Pro fessor O. V. Lounasmaa on behalf of the International Institute of Refrigeration. The eighth London Award was then presented by Professor E.
Autorenporträt
InhaltsangabeFritz London Award Address.- Light Scattering As a Probe of Liquid Helium.- Phase Diagram of Helium Monolayers.- Helium-3 in Superfluid Helium-4.- Some Recent Developments Concerning the Macroscopic Quantum Nature of Superfluid Helium.- A Neutron Scattering Investigation of Bose-Einstein Condensation in Super-fluid 4He.- Temperature and Momentum Dependence of Phonon Energies in Superfluid 4He.- Does the Phonon Spectrum in Superfluid 4He Curve Upward?.- Model Dispersion Curves for Liquid 4He.- Analysis of Dynamic Form Factor S(k, ?) for the Two-Branch Excitation Spectrum of Liquid 4He.- Excitation Spectrum for Weakly Interacting Bose Gas and the Liquid Structure Function of Helium.- Elementary Excitations in Liquid Helium.- Long-Wavelength Excitations in a Bose Gas and Liquid He II at T = 0.- Bose-Einstein Condensation in Two-Dimensional Systems.- Phonons and Lambda Temperature in Liquid 4He as Obtained by the Lattice Model.- Equation of State for Hard-Core Quantum Lattice System.- Impulse of a Vortex System in a Bounded Fluid.- New Results on the States of the Vortex Lattice.- Superfluid Density in Pairing Theory of Superfluidity.- The 3He-Roton Interaction.- Quantum Lattice Gas Model of 3He-4He Mixtures.- The S = 1 Ising Model for 3He-4He Mixtures.- Low Temperature Thermodynamics of Fermi Fluids.- Density and Phase Variables in the Theory of Interacting Bose Systems.- Subcore Vortex Rings in a Ginsburg-Landau Fluid.- Multilayer Helium Films on Graphite.- Submonolayer Isotopic Mixtures of Helium Adsorbed on Grafoil.- Spatial Ordering Transitions in Quantum Lattice Gases.- A Model of the 4He Monolayer on Graphite.- Thermal Properties of the Second Layer of Adsorbed 3He.- Nuclear Magnetic Resonance Investigation of 3He Surface States in Adsorbed 3He-4He Films.- Nuclear Magnetic Relaxation of Liquid 3He in a Constrained Geometry.- Low-Temperature Specific Heat of 4He Films in Restricted Geometries.- Mean Free Path Effects in 3He Quasiparticles: Measurement of the Spin Diffusion Coefficient in the Collisionless Regime by a Pulsed Gradient NMR Technique.- Adsorption of 4He on Bare and on Argon-Coated Exfoliated Graphite at Low Temperatures.- Ellipsometric Measurements of the Saturated Helium Film.- Momentum and Energy Transfer Between Helium Vapor and the Film.- Nuclear Magnetic Resonance Study of the Formation and Structure of an Adsorbed 3He Monolayer.- Pulsed Nuclear Resonance Investigation of the Susceptibility and Magnetic Interaction in Degenerate 3He Films.- Measurements and Calculations of the Helium Film Thickness on Alkaline Earth Fluoride Crystals.- The Normal Fluid Fraction in the Adsorbed Helium Film.- Helium II Film Transfer Rates Into and Out of Solid Argon Beakers.- Preferred Flow Rates in the Helium II Film.- Superfluidity of Thin Helium Films.- Superfluidity in Thin 3He-4He Films.- On the Absence of Moderate Velocity Persistent Currents in He II Films Adsorbed on Large Cylinders.- Thermodynamics of Superflow in the Helium Film.- Mass Transport of 4He Films Adsorbed on Graphite.- Helium Film Flow Dissipation with a Restrictive Geometry.- Dissipation in the Flowing Saturated Superfluid Film.- Dissipation in Superfluid Helium Film Flow.- Direct Measurement of the Dissipation Function of the Flowing Saturated He II Film.- Application of the Fluctuation Model of Dissipation to Beaker Film Flow.- Film Flow Driven by van der Waals Forces.- Decay of Saturated and Unsaturated Persistent Currents in Superfluid Helium.- Rotating Couette Flow of Superfluid Helium.- New Aspects of the ?-Point Paradox.- Torque on a Rayleigh Disk Due to He II Flow.- Superfluid 4He Velocities in Narrow Channels between 1.8 and 0.3°K.- Critical Velocities in Superfluid Flow Through Orifices.- Observations of the Superfluid Circulation around a Wire in a Rotating Vessel Containing He II.- An Attempt to Photograph the Vortex Lattice in Rotating He II.- Radial Distribution of Superfluid Vortices in a Rotating Annulus.- Effect of a Constriction on the
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