ISSN:0031-9228    

DOI:10.1063/1.3066261

出版商:AIP    

年代:1948

数据来源: AIP

摘要:

The wars of the latter half of the nineteenth century served to establish scientists as essential subalterns of the generals and admirals in the successful prosecution of large scale conflict. By the end of World War I, scientists had gained a place in the inner sancta. World War II, of course, saw science enthroned and even exalted, a mystery through whose wonders victory could be achieved.

ISSN:0031-9228    

DOI:10.1063/1.3066263

出版商:AIP    

年代:1948

数据来源: AIP

摘要:

There are not enough physicists around for all the jobs they should do.

ISSN:0031-9228    

DOI:10.1063/1.3066226

出版商:AIP    

年代:1948

数据来源: AIP

摘要:

It was a little over sixteen years ago that I accepted, with considerable inward doubt, a teaching appointment at Bryn Mawr College. My previous teaching experience had been with men and the few women physicists I had known had not created an overwhelmingly favorable impression. It was my intention at the time to spend not more than a few years at a women's college. Yet I am still teaching there and enjoying it.

ISSN:0031-9228    

DOI:10.1063/1.3066227

出版商:AIP    

年代:1948

数据来源: AIP

摘要:

The disintegration of a radioactive isotope into a daughter isotope may be accompanied by the emission of beta‐rays (negatrons or positrons) and gamma‐rays.

ISSN:0031-9228    

DOI:10.1063/1.3066231

出版商:AIP    

年代:1948

数据来源: AIP

摘要:

The whole problem of voice communication in flying, emphasized by military needs at extreme conditions of altitude and noise, has stimulated a concerted effort toward its solution.

ISSN:0031-9228    

DOI:10.1063/1.3066233

出版商:AIP    

年代:1948

数据来源: AIP

摘要:

When matter is cooled the heat agitation of the particles which make it up becomes less vigorous and this produces many characteristic effects. For instance, a great part of the electrical resistance of a metal is caused by the obstructing influence of the heat motion of the metal atoms on the electrons' motions, and so when the temperature is reduced the resistance falls. Similarly the ability of a magnetic field to line up the magnetic ions of a paramagnetic salt becomes greater as the temperature is lowered and the magnetic susceptibility rises accordingly. In the early years of this century, and particularly after the quantum theory was developed, the atomic theory of matter was applied to many such problems, and on the whole very satisfactory explanations were found for the observed temperature variation of most physical phenomena down to the lowest temperatures then available (in the region of ten to twenty degrees absolute). There were, it is true, many slight discrepancies of detail, but it looked as if these difficulties would disappear if suitable refinements were made to the theory.

ISSN:0031-9228    

DOI:10.1063/1.3066235

出版商:AIP    

年代:1948

数据来源: AIP

摘要:

Until recently the serious study of meteors was almost entirely an amateur activity in Great Britain. The British Astronomical Association—itself an amateur body—fostered the great work of Denning, who retired from his profession and lived in penury for the sake of his hobby, and in more recent times the work of J. P. M. Prentice, who is the present director of the meteor section of the Association.

ISSN:0031-9228    

DOI:10.1063/1.3066237

出版商:AIP    

年代:1948

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.3066239

出版商:AIP    

年代:1948

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.3066241

出版商:AIP    

年代:1948

数据来源: AIP