Materials Literature
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The design equations for constrained metal-plate lenses are derived. These lenses prove to have exceptional wide-angle scanning properties. The scanning aberrations are investigated by means of a power series expansion of the phase error. This analysis indicates that the square-law error is a function of lens depth an…
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It is shown that a study of the breadth of Debye-Scherrer diffraction lines leads to a determination not only of the mean dimensions of the crystallites in a given direction but also of the statistical distribution of these dimensions.
A variety of a ferromagnetic ferrite is shown to have dielectric properties corresponding to a dielectric constant of the order of ${10}^{5}$. Coupled with a magnetic permeability of about ${10}^{3}$, this leads to dimensional resonance effects such that the apparent permeability of a core whose section is 2.5\ifmmode…
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Ce travail est consacré à l'étude théorique des lois du traînage magnétique des substances massives dans des champs magnétiques faibles vis-à-vis du champ coercitif, c'est-à-dire dans le domaine de Rayleigh. On suppose que les fluctuations thermiques permettent aux parois de séparation entre les domaines élémentaires…
The influence on the h.f.s. of the finite size of the nucleus is considered and the effect is calculated for simple models of the nuclear magnetism. It is pointed out that the distribution of magnetic dipole density over the nuclear volume may vary greatly from nucleus to nucleus depending on the relative contribution…
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