Search results for: helium-3-and-helium-4

Helium 3 and Helium 4

Author : W. E. Keller
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Tritium and Helium 3 in Metals

Author : Rainer Lässer
File Size : 39.5 MB
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Hydrogen can behave as an alkaline metal or a halogen and can react with nearly all elements of the periodic table. This explains the large number of metal hydrides. Since T. Graham's first observation of the absorption of hydrogen in palladium in 1866 the behaviour of hydrogen in metals has been studied very extensively. The interest was motivated by the possible application of metal-hydrogen systems in new technologies (e.g., moderator material in nuclear fission reactors, reversible storage material for thermal energy and large amounts of hydrogen) and by the fact that metal hydrides show very exciting physical properties (e.g., superconductivity, quantum diffusion, order-disorder transitions, phase diagrams, etc.). Many of these properties have been determined for the stable hydrogen isotopes Hand D in various metals. In comparison, very little is known about the behaviour of the ra dioactive isotope tritium in metals. This book is a first attempt to summarize part of the knowledge of tritium gained in the last few years. In addition to the task of presenting the properties of tritium in metals, I have tried to compare these data with those of protium and deuterium. Furthermore, helium-3 is connected inse parably with tritium via the tritium decay. Therefore one chapter of this book is solely devoted to the curious properties of helium in metals caused mainly by its negligible solubility.

Comparative Properties of Helium 3 and Helium 4

Author : Donald P. Kelly
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Helium Three and Helium Four

Author : W. E. Keller
File Size : 22.22 MB
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Notes on units, physical constants, and notation

Viscosity Measurements of Dilute Solutions of Helium 3 in Superfluid Helium 4 Between 0 1 and 1 2 K

Author : Rayjor W. H. Webeler
File Size : 59.18 MB
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Viscosity measurements of dilute solutions of helium 3 in superfluid helium 4.

Cyrogenic Properties of Helium 3 and Helium 4

Author : B. Colyer
File Size : 76.81 MB
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Mass Spectrometer Method for Determining Parts Per Billion Helium 3 in Helium

Author : David E. Emerson
File Size : 31.40 MB
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Improved Method for Determination of Helium 4 in Helium 3 by Mass Spectrometry

Author : Samuel R. M. Burton
File Size : 33.40 MB
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Positron Lifetimes in Liquid Helium 4 and Helium 3

Author : P. Hautojärvi
File Size : 57.41 MB
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Superfluid Helium 3 and Helium 3 helium 4 Mixtures in Aerogel

Author : Gavin James Lawes
File Size : 49.26 MB
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Helium 4

Author : Zygmunt M. Galasiewicz
File Size : 71.91 MB
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Helium 4 is a collection of materials that examines the various properties of helium 4. The book presents 12 experimental studies and seven theoretical studies. The coverage of the text includes the viscosity of liquid helium below the λ-point; the transfer of helium II on glass; and the determination of the velocity of propagation of the second sound in helium II. The theoretical papers tackle topics such as the theory of superfluidity of helium II; radiation of sound in helium II; and the kinetic coefficients of helium II. The book will be of great interest to chemists, chemical engineers, and other scientists from related fields.

Measurements of eta Rho Subscript N in an Interval about T subscript Lambda for Pure Helium 4 and for Three Dilute Mixtures of Helium 3 in Helium 4

Author : Rayjor W. H. Webeler
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Measurements of the product of viscosity and normal density have been made for pure He4 and for three He3-He4 mixtures (He3 mole fractions x3 of 0.005, 0.0475, and 0.1005) over temperature intervals which included their respective Lambda points. The measurements were made using a torsional crystal technique in which a piezoelectric, cylindrical quartz crystal was immersed in the sample fluid and driven at its resonant frequency in a fundamental torsional mode of vibration. The precision of the viscosity and normal density -against-T measurements for the mixture was greater than any previous measurements in the vicinity of experimental Lambda temperature. Doubly reduced plots of viscosity and normal density against T showed a slight but definite tendency for such curves to rotate clockwise about the (1,1) point with increasing x3 up to about 0.05. Values of viscosity were derived from the measurements by computing normal density as a function of reduced temperature. For each mixture, both viscosity and d viscosity/dT were continous across experimental Lambda temperature. No tendency was manifest for such curves to develop discontinuities as x3 decreased. It was, therefore, inferred that both viscosity and d viscosity/dT of pure He4 are continuous across experimental lambda temperature of pure He4. A further result obtained here is that up to mole fractions of 0. 1, the Lambda viscosity of the mixture viscosity (x3) bears a linear relation to the Lambda temperature (x3).--P. [i].

Thermomechanical Effect in Normal Liquid Helium 3 with Helium 4 Pre plating

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Helium Isotopes in Nature

Author : B.A. Mamyrin
File Size : 52.40 MB
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Developments in Geochemistry, Volume 3: Helium Isotopes in Nature presents the isotopic investigations of noble gases. This book describes the origin, the history, and the contemporary distribution of isotopes of helium. Organized into 11 chapters, this volume begins with an overview of mass-spectrometric methods and measurements of the helium isotope abundance. This text then discusses the methods of collecting various terrestrial samples as well as the apparatus for helium extraction, volumetric measurements, and purification. Other chapters consider the isotope composition of primordial, radiogenic, and spallogenic light noble gases. This book discusses as well the origin and distribution of helium isotopes in meteorites, in the Earth's mantle, the crust and ocean, and in the atmosphere. The final chapter deals with the scientific and applied problems that can be resolved to the progress in helium isotope geochemistry. This book is a valuable resource for scientists. Research workers and students interested in the geochemistry of helium will also find this book useful.

Nuclear Magnetic Resonance in Solid Helium 3 Helium 4 Mixtures Between 0 3 K and 2 0 K

Author : D. S. Miyoshi
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Nuclear magnetic resonance techniques have been used to study vacancy diffusion and the exchange interaction of He3 in solid He3-He4 mixtures between 0.3 and 2.0 K for molar volumes between 20 and 22 cc/mole. The concentrations studied are 32.1, 7.78, and 1.94% He3 in He4. (Author).

Helium 3 and Helium 4

Author : Walter E. Keller
File Size : 25.38 MB
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Cryogenic Properties of Helium 3 and Helium 4

Author : B. Colyer
File Size : 48.76 MB
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Heat Capacity of Dilute Solutions of Liquid Helium 3 in Helium 4 at Low Temperatures

Author :
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Magnetic Properties of Dilute Solutions of Liquid Helium 3 in Helium 4 Atlow Temperatures

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Impurity Studies in Liquid Helium 4

Author : Waymond Jay Pettit
File Size : 88.4 MB
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