Materials Literature
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Using Green's function methods, we express the field of a grating of cylinders excited by a plane wave as certain sets of plane waves: a transmitted set, a reflected set, and essentially the sum of the two "inside" the grating. The transmitted set is given by\psi_{o} + 2\SigmaC_{\upsilon}G(\theta_{\upsilon}, \theta_{o…
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Se considera en este trabajo, por una parte, el mecanismo de la acción de los agentes tensoactivos; por otra, las distintas teorías emitidas sobre el fenómeno de la retracción y finalmente los resultados experimentales en cuanto a los efectos de la presencia del “Plastiment” como agente tensoactivo en las pastas y mor…
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Extensive studies of the viscoelastic properties of polymers undertaken in the author's laboratory by means of the method of stress relaxation are here reviewed. The discussion is divided into four parts: chemical stress relaxation, stress relaxation in amorphous polymers, stress relaxation in crystalline polymers, an…
Electron optical experiments on Al foils have revealed individual dislocations in the interior of the metal. The arrangement and movement of individual dislocations have been observed. Most of the dislocations occur in the boundaries of a substructure, the diameter of the subrains being of the order of 1 μ, or more. T…
In ferromagnetic metals an anomalous electrical resistance is observed which is characteristic of the magnetization and is additive to the ordinary electrical resistance. The origin of this anomalous electrical resistance has been discussed by several authors, but all such attempts do not seem to have satisfactorily e…
The mechanism of the thermal relaxation of nuclear spins related with the nuclear magnetic resonance in antiferromagnetics is studied theoretically. The predominant mechanism is provided by the fluctuating local magnetic field at the nucleus coming from the electron spins which flip from time to time due to exchange i…
A detailed discussion of data obtained over the past 15 years concerning the damping of mechanical vibrations in the kilocycle and megacycle range is given. The dependence of the decrement and modulus change on the variables of frequency and strain-amplitude and many other parameters is compared with predictions of th…
The importance to the mechanism of ferromagnetism of exchange interaction between conduction electrons and unfilled inner shell electrons (called s-d interaction) has been pointed out by Zener. Especially for rare earth metals, this interaction seems to be the only mechanism which can cause ferro- and antiferromagneti…
In the case of electron diffraction by crystals containing heavy atoms, it is possible to improve the usual kinematical theory by formulating a pseudokinematical theory, which is expressed in terms of rigorous atomic scattering amplitudes rather than their Born-approximation values. A corresponding improvement can be…
The heat capacity of a large natural crystal of magnetite was measured between 1.8 and 4.2\ifmmode^\circ\else\textdegree\fi{}K. The specific heat, as a function of temperature, is resolved into two parts: a ${T}^{3}$ term that presumably is the lattice heat, and a ${T}^{\frac{3}{2}}$ term that may be identified as a s…