ISSN:0031-9228    

DOI:10.1063/1.2915286

出版商:AIP    

年代:1982

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.2915243

出版商:AIP    

年代:1982

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.2915252

出版商:AIP    

年代:1982

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.2915254

出版商:AIP    

年代:1982

数据来源: AIP

摘要:

To the naive outsider it seems surprising that solar astronomers complain of being hampered by the inadequate spatial resolution of their telescopes. The Sun is, after all, only eight light minutes away, and most of us don't think of it as possessing small‐scale surface features beyond our powers of resolution. Sunspots were studied by Galileo almost four hundred years ago. But in fact, magnetohydrodynamic mechanisms with characteristic scales of 70 km or less appear to be crucial to our understanding of the astrophysics of our nearest star.

ISSN:0031-9228    

DOI:10.1063/1.2915255

出版商:AIP    

年代:1982

数据来源: AIP

摘要:

Quantum chromodynamics, the gauge field theory that describes strongly interacting particles in terms of their quark constituents and the “colored” gluons that bind them, promises us a definitive theory of the nuclear force. QCD has evolved in the past few years primarily through the rich theoretical and experimental progress of elementary‐particle physics at very high energies. Now the nuclear‐physics community, whose traditional experimental realm has largely been confined to much lower collision energies, has begun looking to QCD and multi‐GeV electron accelerators to provide for the first time an adequate basis for understanding the short‐range behavior of nuclear phenomena.

ISSN:0031-9228    

DOI:10.1063/1.2915256

出版商:AIP    

年代:1982

数据来源: AIP

摘要:

The International Union of Pure and Applied Physics is in the process of revising its handbook, “Symbols, Units and Nomenclature in Physics.” To take into account the views of the wider physics community, the Commission conducting the review is soliciting comments and suggestions on any of the matters covered in the report.

ISSN:0031-9228    

DOI:10.1063/1.2915257

出版商:AIP    

年代:1982

数据来源: AIP

摘要:

So concluded the chairman of a Department of Energyad hoccommittee of experts in 1979, after a comprehensive review of the US inertial‐confinement fusion program. In spite of this positive evaluation, the role of inertial‐confinement fusion in the total US energy program continues to be a subject of disagreement. Before I mention the issues of contention, let me describe inertial‐confinement fusion briefly. In a typical scheme, a pea‐sized target pellet containing hydrogen isotopes is projected into a reactor chamber, where it is suddenly irradiated with an intense beam of light or ions from a “driver” (see figure 1). As the surface of the target blasts away, the rocket‐like reaction forces implode the target's interior to densities and temperatures sufficient to cause the hydrogen nuclei to fuse, releasing an amount of energy equivalent to that of a barrel of oil (seePHYSICS TODAY, August 1973, page 46).

ISSN:0031-9228    

DOI:10.1063/1.2915258

出版商:AIP    

年代:1982

数据来源: AIP

摘要:

It was on Thanksgiving day in 1931 that Harold Clayton Urey found definitive evidence of a heavy isotope of hydrogen. Urey's discovery of deuterium is a story of the fruitful use of primitive nuclear and thermodynamic models. But it is also a story of missed opportunity and errors—errors that are particularly interesting because of the crucialpositiverole that some of them played in the discovery. A look at the nature of the theoretical and experimental work that led to the detection of hydrogen of mass 2 reveals much about the way physics and chemistry were done half a century ago.

ISSN:0031-9228    

DOI:10.1063/1.2915259

出版商:AIP    

年代:1982

数据来源: AIP

摘要:

Scribblings on the back of an envelope are as much a part of the professional mystique of the physicist as they are of the story of the Gettysburg Address.

ISSN:0031-9228    

DOI:10.1063/1.2915260

出版商:AIP    

年代:1982

数据来源: AIP