A general analysis of magnetic viscosity based on activation energy concepts is given. A particular case is considered of the application of the theory to the phenomenon occurring in materials in which bulk magnetization proceeds by the rotational movement of the vectors of single domains, which process, according to…

Magnetic Properties and ApplicationsMagnetic Properties of AlloysMagnetic properties of thin films

Determination of Electronic Structure of Molecules from Nuclear Quadrupole Effects

C. H. Townes、B. P. Dailey1949-09-01OpenAlex

Nuclear quadrupole coupling constants in molecules depend on the nuclear quadrupole moments and the variation in electrostatic field at the nucleus. It is shown that this variation of electric field is usually simply related to the molecular electronic structure, being primarily dependent on the way in which valence e…

Solid-state spectroscopy and crystallographyMolecular Spectroscopy and StructureInorganic and Organometallic Chemistry

The Dynamics of Cavitation Bubbles

M. S. Plesset1949-09-01OpenAlex

Abstract Three regimes of liquid flow over a body are defined, namely: (a) noncavitating flow; (b) cavitating flow with a relatively small number of cavitation bubbles in the field of flow; and (c) cavitating flow with a single large cavity about the body. The assumption is made that, for the second regime of flow, th…

Ultrasound and Cavitation Phenomena

The dissociation energy of the N-N bond in hydrazine

M. Szwarc1949-08-15Proceedings of the Royal Society of London A Mathematical and Physical Sciences

Abstract The thermal decomposition, of hydrazine was investigated over a temperature range of 630 to 780°C and at pressures of a few mm. Hg. The experiments were carried out in a flow system, toluene being used as a carrier gas. This technique makes it possible to discriminate between the heterogeneous decomposition o…

Catalysis and Oxidation ReactionsCatalytic Processes in Materials ScienceAdvanced Chemical Physics Studies

The diffraction of X-rays by distorted-crystal aggregates. II. Diffraction by bent lamellae

A. J. C. Wilson1949-08-02Acta Crystallographica

The apparent particle size of distorted crystallites varies from independence of θ and λ (particle-size broadening) to proportionality with λ cosec θ (distortion broadening) as the parameter Eη sin θ/λ increases, where E is a particle size and η is an average strain. For a bent `orthorhombic' lamella of thickness T wi…

X-ray Diffraction in CrystallographyPigment Synthesis and Properties

X-ray diffraction by random layers: ideal line profiles and determination of sructure amplitudes from observed line profiles

A. J. C. Wilson1949-08-02Acta Crystallographica

Warren's calculation of the line profile for diffraction from random layers depends on the use of an approximation function. This can be. avoided, and expressions found for (a) the ideal line profile for slow variation of the structure amplitude, and (b) the variation of the intensity of diffraction as a function of p…

X-ray Spectroscopy and Fluorescence AnalysisGlass properties and applicationsX-ray Diffraction in Crystallography

The crystal and molecular structure of naphthalene. I. X-ray measurements

S. C. Abrahams、J. M. Robertson、John G. White1949-08-02Acta Crystallographica

A comprehensive X-ray investigation of the crystal structure of naphthalene is described, in which all the reflexions that lie within the reach of Cu Kα radiation have been examined. Moving-film photographic methods and visual estimates of intensities by independent observers were employed. From the results a total of…

X-ray Diffraction in CrystallographyElectron and X-Ray Spectroscopy TechniquesX-ray Spectroscopy and Fluorescence Analysis

X-ray diffraction by randomly oriented line gratings

R. C. Jones1949-08-02Acta Crystallographica

This paper contains a calculation of the X-ray diffraction pattern to be expected from a randomly oriented assemblage of line gratings. A line grating is defined as a periodic linear structure, most generally represented by a chain of similarly oriented and uniformly separated unit cells arranged along a straight line…

Photonic Crystals and ApplicationsPhotonic and Optical DevicesOptical Coatings and Gratings

Eindimensionale Fehlordnung in Kristallen und ihr Einfluss auf die Röntgeninterferenzen. I. Berechnung des Fehlordnungsgrades aus den Röntgenintensitäten

H. Jagodziñski1949-08-02OpenAlex

The general theory is developed of X-ray scattering by crystals showing order in two translation directions but disorder in the third direction, the treatments previously published having proved inadequate for the interpretation of some single-crystal observations of the author. The solution of the problem is affected…

Electron and X-Ray Spectroscopy TechniquesX-ray Diffraction in CrystallographyAdvanced ceramic materials synthesis