Volume 11, Issue 7, 01 July 1940
Index of content:
11(1940); http://dx.doi.org/10.1063/1.1712795View Description Hide Description
11(1940); http://dx.doi.org/10.1063/1.1712796View Description Hide Description
11(1940); http://dx.doi.org/10.1063/1.1712799View Description Hide Description
A modified Kapitza method used in the study of conditions favorable to the growth of single crystals of zinc (99.99+ percent pure), shows that the ratio of the temperature gradient (across the interfacial boundary between the liquid and solid phases) to the rate of growth of the crystal must be maintained within an optimum range of values, depending on the angle of orientation. Optically mosaic crystals give no indication of a preferred region of growth and can be obtained over a much wider range of conditions.
11(1940); http://dx.doi.org/10.1063/1.1712800View Description Hide Description
Recent developments of engines and turbines for producing low temperatures have emphasized the necessity of improved heat interchangers for further progress in the field. The present report covers an experimental investigation of heat interchanger design and operation intended primarily to cover those applications most likely to occur in the experimental rather than in the commercial laboratory.
11(1940); http://dx.doi.org/10.1063/1.1712801View Description Hide Description
Kozeny's approximate solution to the problem of fluid flow through porous media is developed and the result is checked by experimental data on air flow through plugs of cotton, wool, rayon, and glass wool fibers. The solution gives
11(1940); http://dx.doi.org/10.1063/1.1712802View Description Hide Description
A general formulation of the problem of transfer of power from the electron beam to an oscillating circuit by moving charged particles is given. The method is applied specifically to calculation of the behavior of the klystronoscillator in making approximations analogous to those made by Webster in his treatment of the same problem.