ISSN:0031-9228    

DOI:10.1063/1.3066492

出版商:AIP    

年代:1949

数据来源: AIP

摘要:

Spectroscopy has provided not only the information but the inspiration for some of the most striking advances in the knowledge of the nature of matter and of the structure of the atom and the molecule. Very early the spectrum stimulated the minds and the imagination of men; and spectroscopic research is one of the keys which has unlocked the secrets of the universe.

ISSN:0031-9228    

DOI:10.1063/1.3066493

出版商:AIP    

年代:1949

数据来源: AIP

摘要:

It is a truism to state that progress in science depends upon the entire range of research, from the hypothetical extreme of observing and collecting facts to the equally hypothetical extreme of boldly running far ahead into the realm of pure speculation and intuition, thus giving spur to search for new facts. Nevertheless, it is often the case that a disproportionate weighting is accorded to research near the first extreme because of its easily tangible results.

ISSN:0031-9228    

DOI:10.1063/1.3066463

出版商:AIP    

年代:1949

数据来源: AIP

摘要:

Along with several other symposia of the Centennial Meeting of the American Association for the Advancement of Science, the symposium on the Sources of Energy was under the growing realization of the truths so aptly demonstrated by J. Osborne, W. Vogt, Stuart Chase and the conservationists: that humanity is on an unrepeatable spending spree, that we are using up mineral and energy resources on an unprecedented scale, and that these will run out in the foreseeable future. Because this symposium dealt with a rather well defined and clearly delimited facet of the whole problem, it could be attempted, with some prospect of success, to point to ways and means by which the apparently unescapable debacle can be avoided, at least as far as the exhaustion of energy sources is concerned. By making more direct use of the source of all terrestrial energy, the solar radiation, and by exploiting directly the source of solar radiation, the nuclear fuels, one can hope to provide the energy necessary for maintaining our standards of life into the indefinite future.

ISSN:0031-9228    

DOI:10.1063/1.3066464

出版商:AIP    

年代:1949

数据来源: AIP

摘要:

Sir:P. M. S. Blackett, the winner of the Nobel prize in physics in 1948, believes that thousands of atomic bombs would be needed to produce decisive results in a war with the Soviet Union; William L. Laurence, New York Times reporter whose articles about the bomb won a Pulitzer prize for him in 1946, believes that fifty bombs would suffice. This is an astonishing range. Blackett's estimate may be the result of more deliberate study than Laurence's, but the newspaperman's figure agrees better with the impressions given by most American physicists in their discussion of the effectiveness of the atomic bomb. Which estimate is closer to the truth? Assuming other factors to be about equal, what would be the order of magnitude of the number of bombs necessary to determine the outcome of a war between two great continental powers?

ISSN:0031-9228    

DOI:10.1063/1.3066465

出版商:AIP    

年代:1949

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.3066466

出版商:AIP    

年代:1949

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.3066467

出版商:AIP    

年代:1949

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.3066470

出版商:AIP    

年代:1949

数据来源: AIP

摘要:

The sixth General Assembly of the International Union of Pure and Applied Physics was held on July 8–10, 1948, at Amsterdam, Holland, in the University of Amsterdam. The report which follows is drawn slightly from the writer's memories and notes, mostly however from documents SG 48–6 and SG 48–8 recently received from P. Fleury, Secretary‐General of the Union. It is stated in one of these that the completeproce`s‐verbalof the meeting will eventually be published as a brochure, which will no doubt be thick. The writer confirms from his memories that the hospitality of the Dutch to the Assembly, collectively and to its individual members, was magnificent.

ISSN:0031-9228    

DOI:10.1063/1.3066471

出版商:AIP    

年代:1949

数据来源: AIP

摘要:

The 290th meeting of the American Physical Society was held in Berkeley, California, from February 3 to 5, 1949. It was attended by over two hundred fellows and members of the Society, the largest attendance on record for a West Coast meeting. This remark occurs regularly in describing successive meetings, and is good evidence of the growing membership of the Society.

ISSN:0031-9228    

DOI:10.1063/1.3066472

出版商:AIP    

年代:1949

数据来源: AIP