1. |
The ``Palace of Discovery'' at the Paris Exposition of 1937 |
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Journal of Applied Physics,
Volume 9,
Issue 5,
1938,
Page 289-294
Jesse W. M. DuMond,
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ISSN:0021-8979
DOI:10.1063/1.1710418
出版商:AIP
年代:1938
数据来源: AIP
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2. |
Reviews of Recent Research |
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Journal of Applied Physics,
Volume 9,
Issue 5,
1938,
Page 295-297
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PDF (216KB)
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ISSN:0021-8979
DOI:10.1063/1.1710419
出版商:AIP
年代:1938
数据来源: AIP
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3. |
Recent Progress in Supersonics |
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Journal of Applied Physics,
Volume 9,
Issue 5,
1938,
Page 298-306
William T. Richards,
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ISSN:0021-8979
DOI:10.1063/1.1710420
出版商:AIP
年代:1938
数据来源: AIP
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4. |
The Study of Extreme Pressures and their Importance in the Investigation of Engineering Problems |
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Journal of Applied Physics,
Volume 9,
Issue 5,
1938,
Page 307-311
Thomas C. Poulter,
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ISSN:0021-8979
DOI:10.1063/1.1710421
出版商:AIP
年代:1938
数据来源: AIP
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5. |
Application of the Lagrangian Equations to Electrical Circuits |
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Journal of Applied Physics,
Volume 9,
Issue 5,
1938,
Page 312-320
D. A. Wells,
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ISSN:0021-8979
DOI:10.1063/1.1710422
出版商:AIP
年代:1938
数据来源: AIP
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6. |
Contribution to the Problem of Arcback in High Voltage Discharge Devices |
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Journal of Applied Physics,
Volume 9,
Issue 5,
1938,
Page 326-330
H. Klemperer,
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摘要:
It has been found in rectifier and ignitron practice that arcback can occur after deionization of the discharge path at such vapor pressures where no self‐sustaining glow can develop. Experiments to study this kind of an arc breakdown were made in Hg vapor vessels between cold electrodes at voltages between 10 and 60 kv. It appeared that the start of arc breakdown was not dependent on the Paschen law. At the voltages used and distances between the electrodes of less than 50 cm arc breakdown always started at PD values which were much lower than those required to sustain a glow discharge. This is contrary to earlier experience at lower voltages. With rising voltage arc breakdown frequency increased in an exponential manner. Changes in vapor pressure and electrode spacing had no definite effect on arc breakdown frequency as long as glow discharge conditions were not approached. Changes in partial air pressure did not affect arc breakdown frequency if air pressure was below 10 percent of mercury vapor pressure. Heat treatment of the cathode (graphite ``anode'') has a large effect in reducing arc breakdown. Even well heat‐treated ``anodes'' show seasoning effect, i.e. steady decrease of arc breakdown frequency after initial maximum. Phenomena on cathode surface are believed to be responsible for formation of arc breakdown.
ISSN:0021-8979
DOI:10.1063/1.1710423
出版商:AIP
年代:1938
数据来源: AIP
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7. |
Effect of High Energy Electron Random Motion Upon the Shape of the Magnetron Cut‐Off Curve |
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Journal of Applied Physics,
Volume 9,
Issue 5,
1938,
Page 331-334
E. G. Linder,
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摘要:
The shape of the cut‐off curve is explained on the basis of a component of high energy random motion superimposed on the electron orbital motion (see references). Electron temperatures determined from the cut‐off curve shape agree with those determined by probe methods. The possible effects of the random motion on other magnetron characteristics are pointed out.
ISSN:0021-8979
DOI:10.1063/1.1710424
出版商:AIP
年代:1938
数据来源: AIP
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8. |
The Numerical Solution of Laplace's Equation |
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Journal of Applied Physics,
Volume 9,
Issue 5,
1938,
Page 334-348
G. H. Shortley,
R. Weller,
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摘要:
This paper considers in detail numerical methods of solving Laplace's equation in an arbitrary two‐dimensional region with given boundary values. The methods involve the solution of approximating difference equations by iterative procedures. Modifications of the standard Liebmann procedure are developed which lead to a great increase in the convenience and rapidity of obtaining such a numerical solution. These modifications involve the use of formulas which simultaneously improve a block of points in place of a single point; methods of operating on the differences of trial functions in place of the functions themselves; and also a method of extrapolating to the final solution of the difference equations. The theory underlying these procedures is considered in detail by a new method which involves the expansion of the error and difference functions in terms of eigenfunctions. This permits definite comparison of rates of convergence of various procedures. The techniques of handling practical problems are considered in detail.
ISSN:0021-8979
DOI:10.1063/1.1710426
出版商:AIP
年代:1938
数据来源: AIP
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