ISSN:0031-9228    

DOI:10.1063/1.3071080

出版商:AIP    

年代:1972

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.3071082

出版商:AIP    

年代:1972

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.3071083

出版商:AIP    

年代:1972

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.3071085

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

A popular picture of the neutron star has been a solid crust on top of a liquid, possibly superfluid. Now some theorists also envision a solid core. Such a picture might explain the disparity between the slowing‐down rates of the Crab and Vela pulsars. These ideas on neutron stars were discussed at the symposium on Physics of Dense Matter held in Boulder at the end of August. Another exotic state of matter discussed at the meeting is a mixture of protons, neutrons and negative pions.

ISSN:0031-9228    

DOI:10.1063/1.3071087

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

Copernicus, the most recent of NASA's Orbiting Astronomical Observatories, has been placed in orbit and is operating successfully. The ultraviolet and x‐ray telescopes it carries are both reported to be in good order, and the pointing system that aims them for observation is operating at better than expected accuracy.

ISSN:0031-9228    

DOI:10.1063/1.3071088

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

Last year a group at the University of Utah said that the anomalous muon flux they had been observing in cosmic rays since 1966 was consistent with the observation of a W particle or intermediate vector boson (PHYSICS TODAY, November 1971, page 17). At the XVI Conference on High‐Energy Physics (held at both the University of Chicago and the National Accelerator Laboratory) in September the group, Haven E. Bergeson, Gary Carlson, Jack Keuffel and James Morrison announced what Keuffel called “the obituary of the Utah effect.” Keuffel told us, “Alas, no W's. It was fun while it lasted!”

ISSN:0031-9228    

DOI:10.1063/1.3071089

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

The physicochemical basis of biological order is a puzzling problem that has occupied whole generations of biologists and physicists and has given rise, in the it, to passionate discussions. Biological systems are highly complex and ordered objects. It is generally accepted that the present order reflects structures acquired during a long evolution. Moreover, the maintenance of order in actual living systems requires a great number of metabolic and synthetic reactions as well as the existence of complex mechanisms controlling the rate and the timing of the various processes. All these features bring the scientist a wealth of new problems. In the first place one has systems that have evolved spontaneously to extremely organized and complex forms. On the other hand metabolism, synthesis and regulation imply a highly heterogeneous distribution of matter inside the cell through chemical reactions and active transport.Coherent behavioris really the characteristic feature of biological systems (see the box on page 24).

ISSN:0031-9228    

DOI:10.1063/1.3071090

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

Devices that exploit the properties of elastic surface waves can perform very complex signal‐processing functions, identical to those carried out by conventional electromagnetic devices. The great advantage to using surface waves instead of electromagnetic waves is the tremendous reduction in size of surface‐wave devices compared to their electromagnetic counterparts. This great reduction in size is the result of the great difference between the elastic and electromagnetic velocities. Surface waves propagate at velocities approximately105 timesslower than electromagnetic velocities; thus, at the same frequency, the elastic wavelength is105 timesshorter than the electromagnetic wavelength. A further advantage is that the energy in the elastic surface wave can readily be sensed anywhere along its path.

ISSN:0031-9228    

DOI:10.1063/1.3071091

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

On behalf of 276 members of The American Physical Society, I have introduced the amendment to the APS constitution described in the January issue of theBulletinof that Society. I urge the membership of APS to give this amendment their most careful consideration.

ISSN:0031-9228    

DOI:10.1063/1.3071092

出版商:AIP    

年代:1972

数据来源: AIP