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Wave transmission and reflection phenomena in liquid Helium IIJanuary 1947 (has links)
by John R. Pellam. / "November 7, 1947." / Bibliography: p. 17. / Army Signal Corps Contract No. W-36-039 sc-32037.
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Ultrasonic velocity and absorption in liquid heliumJanuary 1947 (has links)
by John R. Pellam and Charles F. Squire. / "August 1, 1947." / Bibliography: p. 16. / Army Signal Corps Contract No. W-36-039 sc-32037
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Examination of 4He droplets and droplets containing impurities at zero Kelvin using a density functional approachBrown, Ellen 01 August 2011 (has links)
Abstract
Detailed in this manuscript is a methodology to model ground state properties of 4He droplets at zero pressure and zero Kelvin using a density functional theory of liquid helium. The density functional approach examined here consists of two noted functionals from the literature and corresponding mean field definitions. A mean field and trial density are defined for each system and optimized to self-consistency using a matrix diagonalization technique. Initial calculations of planar slabs are performed and demonstrate reasonable agreement with experiment and with prior studies using density functional theory. Quantum properties of droplets and droplets containing atomic dopants are calculated. Three different He-dopant potentials are examined to test the limits of the functional methods. For each impurity interaction, an average of 12 atoms were found to reside in the first solvation shell with an atomic dopant placed at the droplet center. Maximum densities in the first solvation shell reached those of solid helium as predicted by DF methods.
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A new method of studying the ground-state properties and elementary excitation spectrum of superfluid helium at very low temperature /Chow, Wan-ki. January 1982 (has links)
Thesis--Ph. D., University of Hong Kong, 1983.
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Measurement of the parity nonconserving spin-rotation of transmitted cold neutrons through a liquid helium target /Markoff, Diane Melanie. January 1998 (has links)
Thesis (Ph. D.)--University of Washington, 1998. / Vita. Includes bibliographical references (leaves [145]-150).
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Thermodynamics of helium and hydrogen films adsorbed on single-walled carbon nanotube bundles /Wilson, Tate. January 2004 (has links)
Thesis (Ph. D.)--University of Washington, 2004. / Vita. Includes bibliographical references (p. 123-132).
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Measurements of the longitudinal nuclear magnetic resonance in superfluid helium-3 as a function of magnetic field /Sherrill, David Semmes January 1987 (has links)
No description available.
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A Theoretical Investigation of Bound Roton Pairs in Superfluid Helium-4Cheng, Shih-ta 08 1900 (has links)
The Bogoliubov theory of excitations in superfluid helium is used to study collective modes at zero temperature. A repulsive delta function shell potential is used in the quasiparticle excitation energy spectrum to fit the observed elementary excitation spectrum, except in the plateau region. The linearized equation of motion method is used to obtain the secular equation for a collective mode consisting of a linear combination of one and two free quasiparticles of zero total momentum. It is shown that in this case for high-lying collective modes, vertices involving three quasiparticles cancel, and only vertices involving four quasiparticles are important. A decomposition into various angular momentum states is then made. Bound roton pairs in the angular momentum D-state observed in light-scattering experiments exist only for an attractive coupling between helium atoms in this oversimplified model. Thus, the interaction between particles can be reinterpreted as a phenomenological attractive coupling between quasiparticles, in order to explain the Raman scattering from bound roton pairs in superfluid helium.
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Pressure dependence of second-sound velocity in liquid helium IIJanuary 1950 (has links)
[by] R.D. Maurer [and] Melvin A. Herlin. / Bibliography: p. 6. / Army Signal Corps Contract No. W-36-039 sc-32037, Project no. 102B. Dept. of the Army Project No. 3-99-10-022.
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Process Control Methods for Operation of Superconducting Cavities at the LEP Accelerator at CERNMagnuson, Martin January 1992 (has links)
The aim of this thesis is to analyse the cryogenic process for cooling superconducting radio frequency accelerator test cavities in the LEP accelerator at CERN. A liquefaction cryoplant is analysed, including the production of liquid helium at 4.5 K, the systems for distribution and regulation of liquid helium, and the radio frequency field used for accelerating particles. After discussing regulation problems and modifications planned for a new cavity installation in 1992, different techniques for specifying the control programs for the new installation are evaluated. Various diagramming techniques, standards and methodologies, and Computer Aided Software Engineering-tools, are compared as to their practical usefulness in this kind of process control. Finally, in accordance with anticipated requirements, possible ways of making high and low level control program specifications are suggested.
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