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1. |
First Report of War Policy Committee |
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Review of Scientific Instruments,
Volume 13,
Issue 6,
1942,
Page 245-247
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PDF (183KB)
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ISSN:0034-6748
DOI:10.1063/1.1770025
出版商:AIP
年代:1942
数据来源: AIP
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2. |
Some Operating Characteristics of the Wilson Cloud Chamber |
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Review of Scientific Instruments,
Volume 13,
Issue 6,
1942,
Page 247-257
Wayne E. Hazen,
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PDF (664KB)
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摘要:
The following characteristics of cloud‐chamber behavior were studied: (a) the dependence of minimum pressure on expansion time, (b) the ion threshold expansion ratio as a function of expansion time, (c) the sensitive time and its dependence on the percent expansion, (d) the rate of pressure rise after completion of a fast expansion, and (e) the rate of drop growth in N2, H2, and He with vapor from 95 percent C2H5OH or a liquid mixture of one part H2O to three parts C2H5OH. The experiments were performed with large cloud chambers (30‐cm diameter and 10‐ to 30‐cm depth) filled, in most cases, with N2as the permanent gas and with the vapor from a 1 : 3 liquid mixture of H2O and C2H5OH. (a) The minimum pressure is found to be proportional to the square root of the expansion time. (b) The ion threshold expansion ratio increases linearly with expansion time. (c) The sensitive time increases with expansion ratio, reaches a maximum when the general background becomes appreciable, and approaches zero for higher expansion ratios. (d) The initial pressure rise after completion of an expansion is proportional to the square root of the time. (e) The surface area of a drop increases linearly with time in all cases. The temperature of a drop calculated from the rate of growth and from thermal constants is much lower for H2and He than for N2. The results in (a), (b), (c), and (d) agree with results predicted by Williams' equations or equations obtained from similar considerations. The results for the rate of growth in (e) are in reasonable accord with values calculated from the diffusion equation.
ISSN:0034-6748
DOI:10.1063/1.1770026
出版商:AIP
年代:1942
数据来源: AIP
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3. |
A Complete Proportional Counter Arrangement for Cosmic‐Ray Measurements |
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Review of Scientific Instruments,
Volume 13,
Issue 6,
1942,
Page 258-264
Paul Weisz,
W. E. Ramsey,
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PDF (414KB)
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摘要:
An apparatus which has served successfully to study the ionizing capacity of individual particles of the cosmic radiation is described. The analyzing chamber is a carefully designed proportional counter tube filled with purified argon. Although this counter is working continuously, the amplifier has zero sensitivity unless a ray passes through a pre‐determined path in the counter. This control is accomplished by a system of Geiger‐Mu¨ller counters operating as a conventional telescope which ``turns on'' the amplification and recording mechanism for a period of time beginning with the passage of the ray and ending approximately 4×10−4sec. later. During this time the amount of charge released in the proportional counter by this ray, and only this ray, is recorded. Certain general principles of proportional counter mechanism are discussed.
ISSN:0034-6748
DOI:10.1063/1.1770027
出版商:AIP
年代:1942
数据来源: AIP
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4. |
A Micro‐Gas‐Analyzer |
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Review of Scientific Instruments,
Volume 13,
Issue 6,
1942,
Page 264-266
P. F. Scholander,
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PDF (192KB)
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ISSN:0034-6748
DOI:10.1063/1.1770028
出版商:AIP
年代:1942
数据来源: AIP
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5. |
Sealing Mica to Glass or Metal to Form a Vacuum‐Tight Joint |
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Review of Scientific Instruments,
Volume 13,
Issue 6,
1942,
Page 266-267
J. S. Donal,
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ISSN:0034-6748
DOI:10.1063/1.1770030
出版商:AIP
年代:1942
数据来源: AIP
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6. |
Sealing Quartz Windows on Pyrex Tubes |
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Review of Scientific Instruments,
Volume 13,
Issue 6,
1942,
Page 267-269
Sidney W. Benson,
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PDF (247KB)
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ISSN:0034-6748
DOI:10.1063/1.1770031
出版商:AIP
年代:1942
数据来源: AIP
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7. |
New Instruments |
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Review of Scientific Instruments,
Volume 13,
Issue 6,
1942,
Page 269-272
Wm. F. Roeser,
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PDF (387KB)
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ISSN:0034-6748
DOI:10.1063/1.1770032
出版商:AIP
年代:1942
数据来源: AIP
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8. |
New Materials |
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Review of Scientific Instruments,
Volume 13,
Issue 6,
1942,
Page 272-274
A. R. Olpin,
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PDF (271KB)
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ISSN:0034-6748
DOI:10.1063/1.1770033
出版商:AIP
年代:1942
数据来源: AIP
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