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1. |
The Relation of Physics to the Biological Sciences |
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Journal of Applied Physics,
Volume 9,
Issue 3,
1938,
Page 139-142
Detlev W. Bronk,
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ISSN:0021-8979
DOI:10.1063/1.1710402
出版商:AIP
年代:1938
数据来源: AIP
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2. |
Electron Diffraction Methods of Studying Organic Films |
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Journal of Applied Physics,
Volume 9,
Issue 3,
1938,
Page 143-147
L. H. Germer,
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PDF (299KB)
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ISSN:0021-8979
DOI:10.1063/1.1710403
出版商:AIP
年代:1938
数据来源: AIP
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3. |
The Biophysics and Biochemistry of Viruses |
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Journal of Applied Physics,
Volume 9,
Issue 3,
1938,
Page 148-155
W. M. Stanley,
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PDF (655KB)
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ISSN:0021-8979
DOI:10.1063/1.1710404
出版商:AIP
年代:1938
数据来源: AIP
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4. |
The Photochemical Basis of Vision |
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Journal of Applied Physics,
Volume 9,
Issue 3,
1938,
Page 156-164
Selig Hecht,
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PDF (621KB)
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ISSN:0021-8979
DOI:10.1063/1.1710405
出版商:AIP
年代:1938
数据来源: AIP
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5. |
The Mechanics of Muscular Contraction in Man |
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Journal of Applied Physics,
Volume 9,
Issue 3,
1938,
Page 165-177
W. O. Fenn,
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PDF (947KB)
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ISSN:0021-8979
DOI:10.1063/1.1710406
出版商:AIP
年代:1938
数据来源: AIP
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6. |
Some Aspects of Nuclear Physics of Possible Interest in Biological Work |
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Journal of Applied Physics,
Volume 9,
Issue 3,
1938,
Page 178-186
L. A. DuBridge,
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PDF (671KB)
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ISSN:0021-8979
DOI:10.1063/1.1710407
出版商:AIP
年代:1938
数据来源: AIP
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7. |
Quantitative Measurements of Texture by the Magnetic Torque Method |
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Journal of Applied Physics,
Volume 9,
Issue 3,
1938,
Page 192-196
L. P. Tarasov,
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PDF (346KB)
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摘要:
Magnetic torque measurements offer a possibility of specifying texture in ferromagnetic materials in a quantitative fashion and several methods have been proposed for accomplishing this. The method of Akulov and Bru¨chatov, although formally correct, is shown to be so restricted by its assumptions as to be inapplicable even to the commonest texture. A method proposed by Bitter, involving root‐mean‐square deviations from some mean orientation, is found to fail in practice because of the uncertainty in the measurement of the magnetic energy. A modification of this method, in which x‐ray data are used to establish a relationship between two of the root‐mean‐square deviations, gives results in fair agreement with the pole figure of a cold‐rolled iron‐silicon alloy.
ISSN:0021-8979
DOI:10.1063/1.1710408
出版商:AIP
年代:1938
数据来源: AIP
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8. |
Invariant Form of the Maxwell‐Lorentz Field Equations for Accelerated Systems |
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Journal of Applied Physics,
Volume 9,
Issue 3,
1938,
Page 196-208
Gabriel Kron,
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摘要:
It is shown that the invariant field equations of Maxwell for stationary bodies are also valid for accelerated bodies, if all ordinary differentiations are replaced by absolute differentiation. The affine connection &Ggr;&ggr;&agr;&bgr;appearing in the absolute derivatives refers to a general non‐Riemannian metric space, with a holonomic or nonholonomic reference frame. The field equations are in a more general form than those used in the five‐dimensional unified field theory and reduce to the latter as a special case. However, the presence of an electrostatic field is not assumed in this paper. The motion of an accelerated body possessing mass, electric current and magnetic flux is given by an extended form of the dynamical equations of Lagrange containing the same general affine connection as the field equations. The material terms of the dynamical equations are expressed by a mechanical impulse‐energy tensor and the resultant motion of the material body under the influence of an electromagnetic field and a mechanical force is expressed by a combined impulse‐energy equation. The equations are calculated for a representative rotating electrical machine used in industry.
ISSN:0021-8979
DOI:10.1063/1.1710409
出版商:AIP
年代:1938
数据来源: AIP
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9. |
Time Constants of Incandescent Lamps |
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Journal of Applied Physics,
Volume 9,
Issue 3,
1938,
Page 209-214
W. E. Forsythe,
M. A. Easley,
D. D. Hinman,
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摘要:
Candescence and nigrescence curves are shown for a number of tungsten lamps, vacuum and gas‐filled, ranging in size from the automobile lamps up to the 30‐volt, 30‐ampere lamp and the 1000‐watt photoflood lamp. Data are given for similar filaments mounted in vacuum lamps and in lamps filled with argon, nitrogen, hydrogen, and helium. The filament of a vacuum lamp reaches 90 percent brightness on heating in timet=0.060I0.54; 10 percent brightness on cooling in timet=0.022I0.70; for gas‐filled lamps,t=0.15I0.70andt=0.070I0.70, respectively. (Iis the normal operating current of the lamp.) The percent of total variation,P, in brightness during a cycle for a vacuum lamp on 60‐cycle a.c. isP=34D−1.06, on 25‐cycle a.c.,P=28D−1.37; for a gas‐filled lamp,P=75D−0.89andP=63D−0.91, respectively. (Dis the filament diameter in mils.)
ISSN:0021-8979
DOI:10.1063/1.1710410
出版商:AIP
年代:1938
数据来源: AIP
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