摘要:

Forty years ago an experiment mounted on a small sounding rocket measured the X-ray flux emitted by the hot outer layers of our Sun. This event marked the birth of X-ray astronomy, and in the intervening years many bizarre and fascinating objects have been discovered. This article describes these discoveries and the increasingly complex instruments which have made them possible.

ISSN:0010-7514    

DOI:10.1080/00107518908225508

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

Most solids begin to melt at temperatures well below the bulk transition, by forming surface layers of liquid a few molecules thick. Although it is difficult to detect by direct observation, the phenomenon known as surface melting is believed to play important roles in many technical and natural processes, including the processing of powdered metals and ceramics, crystal growth, and the compaction and friction of snow and ice. The theory of surface melting describes how the effect depends on the fundamental properties of the bulk material and its interfaces. Detailed observations of surface melting have been obtained within the past few years, confirming the predictions of theory and raising new questions.

ISSN:0010-7514    

DOI:10.1080/00107518908225509

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

Nuclear magnetic resonance (NMR) has undergone a revolution in the last decade with the original slow-passage spectroscopy method being replaced by pulsed methods. Much of pulsed NMR can be understood in terms of a simple classical, or semi-classical, model of precessing spin vectors, but some new techniques are based purely on quantum mechanical physics. One very useful technique described in this paper is the DEPT sequence, which is an example of correlated quantum states of the type invoked in the Einstein, Podolsky and Rosen paradox. These new developments are not only exciting because of their potential applications, but also interesting in terms of their underlying physics.

ISSN:0010-7514    

DOI:10.1080/00107518908225510

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

We consider the temporal behaviour of convective patterns and focus on fluids with low Prandtl number, particularly with regard to evolution from a stationary state to periodic or erratic behaviour. Part I concerns the concept of pattern instabilities and major pattern defects, and part II the erratic time dependence of natural patterns, possible explanations of the phenomena and experimental tests in simple situations.

ISSN:0010-7514    

DOI:10.1080/00107518908225511

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

ISSN:0010-7514    

DOI:10.1080/00107518908225512

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

ISSN:0010-7514    

DOI:10.1080/00107518908225513

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

300 Years of Gravitation. Edited by S. W. Hawking and W. Israel. 1987, £45.00, pp. xiii + 684. Cambridge University Press, ISBN 0 521 34312 7. Scope: Multiauthor survey. Level: Specialist.

ISSN:0010-7514    

DOI:10.1080/00107518908225514

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

ISSN:0010-7514    

DOI:10.1080/00107518908225515

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor