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The variable parameter (or parametric) principle of amplification is characterized by a typical arrangement in which a variable energy storage element, such as an inductor or a capacitor, is suitably coupled to two resonant circuits. If the value of the energy storage element is made to vary in...
The rate of diffusion of indium in single crystals for two orientations has been measured using the radio‐active isotope In 114 . The diffusion coefficients in the directions parallel to the a axis and c axis are given by the Arrhenius relations D a =34.1 exp(−25 800∕ RT ) cm 2 sec −1 and...
When two circuits such as filters or transmission lines are coupled together by means of distributed reactances which can vary sinusoidally in time and space, energy can be converted between waves of different frequencies in a variety of ways. If the waves on the two transmission lines are...
A reanalysis of data on the thermal conductivity of certain metal oxides has shown that the deviation from a T −1 law may be fitted to a law exponential in T −1 . Thus the deviations may be ascribed to the flow of excitions. The contribution to the thermal conductivity from radiative transfer...
The thermoelastic dissipation due to an edge dislocation moving at an arbitrary speed is calculated analytically and numerical results presented. It is found that, at usual stress levels, this mechanism has only a minor effect in limiting dislocation speed.
It has been found that single crystals of the ferrimagnetic garnets are transparent to visible light. Thin sections (e.g., 0.005 cm thick) transmit sufficient light for microscopic examination. The transmitted light undergoes a nonreciprocal rotation similar to the Faraday effect. By virtue of...
The general solution is obtained for the index of refraction of a variable‐index, spherical lens which will form perfect geometrical images of the points of two given concentric spheres on each other. One conjugate sphere is assumed to be outside the lens or at its surface, while the other may...
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