1. |
Manpower in Physics—A National Emergency |
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Journal of Applied Physics,
Volume 13,
Issue 8,
1942,
Page 471-471
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ISSN:0021-8979
DOI:10.1063/1.1714896
出版商:AIP
年代:1942
数据来源: AIP
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2. |
Science In The U. S. S. R. |
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Journal of Applied Physics,
Volume 13,
Issue 8,
1942,
Page 472-477
J. G. Crowther,
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ISSN:0021-8979
DOI:10.1063/1.1714897
出版商:AIP
年代:1942
数据来源: AIP
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3. |
Response by Dr. William D. Coolidge in Accepting the Duddell Medal at the Meeting of the American Physical Society, May 1, 1942 |
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Journal of Applied Physics,
Volume 13,
Issue 8,
1942,
Page 478-480
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PDF (221KB)
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ISSN:0021-8979
DOI:10.1063/1.1714898
出版商:AIP
年代:1942
数据来源: AIP
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4. |
Re´sume´ of Recent Research |
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Journal of Applied Physics,
Volume 13,
Issue 8,
1942,
Page 481-482
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PDF (147KB)
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ISSN:0021-8979
DOI:10.1063/1.1714899
出版商:AIP
年代:1942
数据来源: AIP
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5. |
Theory of Vehicle Suspensions |
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Journal of Applied Physics,
Volume 13,
Issue 8,
1942,
Page 484-495
Pierre Ernest Mercier,
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摘要:
The present theory of the suspension of vehicles is established on the assumption of perfect symmetry and of a linear dependence between elastic forces and the displacements of the wheels and deflections of the tires. The path of the vehicle rolling on uneven ground is supposed nearly straight, but no other important limitations are made in the fundamental hypothesis, so that the results cover any kind of suspension. The relative magnitude of the seven vibrations corresponding to bobbing, rolling, and pitching motions of the body, and to the four specific vibrations of the wheels, are discussed in view of their combined effects on the displacements of the body of the car. The general conclusion, which attempts to separate as much as possible the respective frequencies to avoid beats and also directly to improve comfort, is in accord with several practical experiments made in the industrial field.
ISSN:0021-8979
DOI:10.1063/1.1714900
出版商:AIP
年代:1942
数据来源: AIP
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6. |
Calculation of Axially Symmetric Fields |
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Journal of Applied Physics,
Volume 13,
Issue 8,
1942,
Page 496-502
Sidney Bertram,
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摘要:
A practical method is developed for calculating the distribution of scalar fields in axially symmetric systems. To obtain a complete solution a knowledge of the potential distribution along a cylinder of constant radius is required; in many cases the distribution along the cylinder can be estimated with sufficient accuracy by an inspection of the electrode configuration. The solution is first obtained in the form of an integral. This is evaluated for the class of boundary potential functions of the formVn(1, z)=zn,z>00,z<0.In this expression,Vn(1,z) is the potential along a cylinder of unit radius,zis measured along the axis of the cylinder, andnis a positive integer (zero included). Numerical values are given in tabular form for the casesn=0, 1, 2 and 3. It is then shown how the solution for the above boundary potential functions can be used to obtain the solution for an arbitrary distribution of potential along a cylinder of constant radius. In particular, the potential distribution of a simple electron lens consisting of two coaxial cylindrical electrodes of equal diameters is expressed in terms of the tabulated functions. The calculated equipotential lines for one such case are compared graphically with a plot made in an electrolytic plotting tank. The comparison between the calculated and experimental results is quite favorable.
ISSN:0021-8979
DOI:10.1063/1.1714901
出版商:AIP
年代:1942
数据来源: AIP
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7. |
The Operational Theory of Longitudinal Impact |
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Journal of Applied Physics,
Volume 13,
Issue 8,
1942,
Page 503-511
Louis A. Pipes,
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摘要:
The differential equations governing the longitudinal displacement and velocity of a uniform rod are identical to those governing the propagation of charge and current along a uniform electrical transmission line. By making use of this analogy between the rod and the transmission line, it is possible to translate some well‐known results of electrical circuit theory to mechanical terms. In this manner, and by the use of the operational calculus, interesting and useful results in the theory of longitudinal impact are obtained. The treatment is vastly simpler and more general than the classical theory of Saint‐Venant and Boussinesq and some of the results are thought to be new.
ISSN:0021-8979
DOI:10.1063/1.1714902
出版商:AIP
年代:1942
数据来源: AIP
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8. |
Energy and Energy Flow in the Electromagnetic Field |
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Journal of Applied Physics,
Volume 13,
Issue 8,
1942,
Page 512-518
J. Slepian,
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摘要:
A new method for deriving the usual Poynting vector is given. This method also yields other equally valid energy flow vectors with the same or other equally valid postulated electromagnetic energy densities. Examples of such alternative Poynting vectors with their associated energy densities are given. A definition is given which distinguishes between the conduction and displacement currents in matter. It is shown that by addition of a term, the postulated energy flow widely used by electrical power engineers and based on wattmeter readings becomes a valid alternative Poynting vector.
ISSN:0021-8979
DOI:10.1063/1.1714903
出版商:AIP
年代:1942
数据来源: AIP
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9. |
The Use of Secondary Electron Emission to Obtain Trigger or Relay Action |
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Journal of Applied Physics,
Volume 13,
Issue 8,
1942,
Page 519-523
A. M. Skellett,
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摘要:
The use of secondary electrons to obtain trigger action similar to that of a thyratron is described. An experimental tube and the necessary circuits by which this action is achieved are discussed. This combination gives the features of a triode with a relay or on and off feature, resulting in an amplifier, oscillator, modulator, or other vacuum tube device which may be turned on or off abruptly at high or low frequencies. In addition, it can be used to replace thyratrons in many of their circuits where very low impedance is not necessary and is capable of much greater speeds of operation in such applications.
ISSN:0021-8979
DOI:10.1063/1.1714904
出版商:AIP
年代:1942
数据来源: AIP
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10. |
Errata: Electrostatic Electron Lenses with a Minimum of Spherical Aberration |
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Journal of Applied Physics,
Volume 13,
Issue 8,
1942,
Page 524-524
Gilbert N. Plass,
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ISSN:0021-8979
DOI:10.1063/1.1714905
出版商:AIP
年代:1942
数据来源: AIP
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