ISSN:0031-9228    

DOI:10.1063/1.3070839

出版商:AIP    

年代:1972

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.3070841

出版商:AIP    

年代:1972

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.3070844

出版商:AIP    

年代:1972

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.3070845

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

The National Science Foundation has announced the site for the proposed Very Large Array telescope, preliminary funds for which are included in President Nixon's FY 1973 budget proposal. The telescope would be built on the Plains of San Augustin, near Datil, New Mexico, about 50 miles west of Socorro. It would have from 10 to 100 times the resolution of the next largest instrument, which is at Westerbork in the Netherlands.

ISSN:0031-9228    

DOI:10.1063/1.3070847

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

John Wheatley is known for his work at very low temperatures. When we recently visited his laboratory deep underground in Urey Hall at the University of California in La Jolla, Wheatley told us that he is excited about a noise thermometer that has its instrumental noise limit in the microdegree region. In work with Richard Webb and Robin Gifford this thermometer has measured 5 millideg K.

ISSN:0031-9228    

DOI:10.1063/1.3070848

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

Luis Alvarez and his collaborators at Berkeley have built a proportional counter filled with liquid xenon. When we recently discussed the new counter (while flying over the Bay Area in Alvarez's twin‐engine Cessna), he told us that the new counter will be useful for cosmic‐ray satellite experiments, for ground‐based high‐energy particle detection and as a medical gamma‐ray camera.

ISSN:0031-9228    

DOI:10.1063/1.3070849

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

Plasma‐physics theories often have had little connection with reality, according to Hannes Alfve´n. When we recently chatted with him in his office at the University of California in La Jolla (shortly before he left for his annual six‐month stay at the Royal Institute of Technology in Stockholm) Alfve´n pointed out that two major confrontations between theory and experiment have occurred. One took place when controlled thermonuclear experiments began. “The result was catastrophic,” he said. The second confrontation came when space missions made the magnetosphere and interplanetary space accessible to physical instruments, and some cherished theories became ripe for revision. In the future, Alfve´n believes, at least three “sacrosanct” astrophysics theories may be drastically revised.

ISSN:0031-9228    

DOI:10.1063/1.3070850

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

For more than two decades physicists have used the optical model to describe the high‐energy scattering of nucleons by nuclei. The motivation underlying the model both in nuclear scattering and in particle scattering is to represent the complex projectile–target interaction by a two‐body complex potential. This makes the optical‐model description somewhat analogous to the propagation of light through a refracting and absorbing medium. The success of such a description in high‐energy nucleon–nucleus scattering is now well established.

ISSN:0031-9228    

DOI:10.1063/1.3070851

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

Within the next 30 years we will call upon our resources and technology to supply more energy than has been consumed throughout all history. Population pressures, the necessity for increased living standards in the underdeveloped nations, the demands of material affluence in the technological societies, the need to improve management of our dwindling natural resources and to protect our environment will force energy demand to unprecedented levels.

ISSN:0031-9228    

DOI:10.1063/1.3070852

出版商:AIP    

年代:1972

数据来源: AIP