ISSN:0031-9228    

DOI:10.1063/1.2809940

出版商:AIP    

年代:1991

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.2809941

出版商:AIP    

年代:1991

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.2809943

出版商:AIP    

年代:1991

数据来源: AIP

摘要:

The 1990 Nobel Prize in Physics has been awarded to Jerome Friedman and Henry Kendall of MIT and Richard Taylor of SLAC “for their pioneering investigations concerning deep inelastic scattering of electrons on protons and bound neutrons, which have been of essential importance for the development of the quark model in particle physics.” The prize of $710 000, which the three recipients shared equally, was awarded in Stockholm on 10 December.

ISSN:0031-9228    

DOI:10.1063/1.2809944

出版商:AIP    

年代:1991

数据来源: AIP

摘要:

As the Magellan spacecraft orbits Venus its radar instruments are penetrating the thick clouds that prevent optical cameras from photographing the planet's surface. A portion of the Venusian surface was unveiled at a meeting of the American Geophysical Union in San Francisco in early December when mission scientists presented radar images of the planet and discussed their first tentative interpretations of what those images reveal. The images on these pages represent only a few of the strikingly diverse types of terrain that have been seen so far, with the mission having mapped only 15&percent; of the surface.

ISSN:0031-9228    

DOI:10.1063/1.2809945

出版商:AIP    

年代:1991

数据来源: AIP

摘要:

An early theme in probability was calculating the fair ante for various games of chance. Nicolas Bernoulli introduced a seemingly innocent game, first published in 1713, that yielded a paradoxical result. The result has become known as the St. Petersburg paradox, because of an analysis written later by Daniel Bernoulli in theCommentary of the St. Petersburg Academy.

ISSN:0031-9228    

DOI:10.1063/1.881289

出版商:AIP    

年代:1991

数据来源: AIP

摘要:

The Ebert spectrometer, named for its inventor, the 19th‐century German spectroscopist Hermann Ebert, emerged from obscurity after the Second World War to play a significant role in the exploration of the solar system. I had a part in its resurrection, and the Ebert spectrometer has played a dominant role in my scientific career. Therefore I've taken the trouble to look into its history. The evolution of this instrument, now a century old, was curiously haphazard and fraught with mistakes. I have attempted here to put these events into chronological, and somewhat autobiographical, perspective.

ISSN:0031-9228    

DOI:10.1063/1.881290

出版商:AIP    

年代:1991

数据来源: AIP

摘要:

Only about 20&percent; of American high school graduates have studied physics, and this percentage has not changed much the last couple of decades. The situation is distressing when one considers that our way of life has become increasingly tied to technology, with physics playing a critical role. In many other developed countries, including Japan, England and Korea, all high school students study physics, and they start much earlier than the 11th or 12th grade.

ISSN:0031-9228    

DOI:10.1063/1.881291

出版商:AIP    

年代:1991

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.2809946

出版商:AIP    

年代:1991

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.2809948

出版商:AIP    

年代:1991

数据来源: AIP