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1 Jul 1940

Volume 11, Issue 7, pp. 451-507


National Defense and the Physicist

J. Appl. Phys. 11, 451 (1940); http://dx.doi.org/10.1063/1.1712794 (1 page)

Online Publication Date: 13 April 2004

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Abstract Unavailable

Spectrochemical Analysis of Sheet Steel at the Great Lakes Steel Company

R. A. Sawyer and H. B. Vincent

J. Appl. Phys. 11, 452 (1940); http://dx.doi.org/10.1063/1.1712795 (7 pages) | Cited 1 time

Online Publication Date: 13 April 2004

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Abstract Unavailable

The Mechanism of Spark Discharge in Air at Atmospheric Pressure. II

Leonard B. Loeb and J. M. Meek

J. Appl. Phys. 11, 459 (1940); http://dx.doi.org/10.1063/1.1712796 (16 pages) | Cited 13 times

Online Publication Date: 13 April 2004

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Abstract Unavailable

Resumés of Recent Research

J. Appl. Phys. 11, 475 (1940); http://dx.doi.org/10.1063/1.1712797 (2 pages)

Online Publication Date: 13 April 2004

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Abstract Unavailable

A Correlation Method for the Elimination of Errors Due to Unstable Excitation Conditions in Quantitative Spectrum Analysis

Saul Levy

J. Appl. Phys. 11, 480 (1940); http://dx.doi.org/10.1063/1.1712798 (8 pages) | Cited 2 times

Online Publication Date: 13 April 2004

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Abstract Unavailable

Growth Conditions for Single and Optically Mosaic Crystals of Zinc

C. A. Cinnamon and Albert B. Martin

J. Appl. Phys. 11, 487 (1940); http://dx.doi.org/10.1063/1.1712799 (4 pages) | Cited 2 times

Online Publication Date: 13 April 2004

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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.

An Experimental Study of Heat Interchangers

R. B. Jacobs and S. C. Collins

J. Appl. Phys. 11, 491 (1940); http://dx.doi.org/10.1063/1.1712800 (5 pages) | Cited 6 times

Online Publication Date: 13 April 2004

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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.

Flow of a Gas Through Porous Media

J. L. Fowler and K. L. Hertel

J. Appl. Phys. 11, 496 (1940); http://dx.doi.org/10.1063/1.1712801 (7 pages) | Cited 30 times

Online Publication Date: 13 April 2004

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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
math
for the isothermal linear flow of a gas. W∕A is the macroscopic flux density; μ, the viscosity; γ0, the density of the gas at unit pressure; τ∕σ, the volume of fibers divided by their surface area; c, the fraction of space occupied by fibers; δp2∕δx, the macroscopic gradient of the square of the pressure; and k is a numerical constant which depends on the shape and orientations of the fluid passages. k was found experimentally to be 0.18, which is in approximate agreement with the value found for flow through media made up of spherical particles. The dependence of the flow on the factor c was checked over the approximate range from c=0.1 to c=more than 0.5. τ∕σ and c have values for fineness and density of samples of fibers in fair agreement with independent determinations.

Electronic Generation of Electromagnetic Oscillations

E. U. Condon

J. Appl. Phys. 11, 502 (1940); http://dx.doi.org/10.1063/1.1712802 (5 pages) | Cited 2 times

Online Publication Date: 13 April 2004

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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 klystron oscillator in making approximations analogous to those made by Webster in his treatment of the same problem.
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Backfiring in Mercury Arc Rectifiers

John E. White

J. Appl. Phys. 11, 507 (1940); http://dx.doi.org/10.1063/1.1712803 (1 page) | Cited 2 times

Online Publication Date: 13 April 2004

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Abstract Unavailable
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