摘要:

The breaking strength of a real solid is not determined directly by the interatomic forces but by the properties of the imperfections that the solid contains. To be very strong a solid must resist both pltlstic yielding and brittle cracking. One material cannot normally resist both types of failure. Strong metals are designed to resist plastic yielding. Modern strong composite materials can be devised, in which brittle substances are used and a fibrous microstructure designed to arrest crack propagation.

ISSN:0010-7514    

DOI:10.1080/00107516708202157

出版商:Taylor & Francis Group    

年代:1967

数据来源: Taylor

摘要:

The present paper contains an account of the type and properties of spacecraft used between 1969–66 for lunar exploration at close renge; and a brief survey of principal results obtained with their aid—with particular attention to soft-landing and orbiting mooncraft launched in the course of 1966.

ISSN:0010-7514    

DOI:10.1080/00107516708202158

出版商:Taylor & Francis Group    

年代:1967

数据来源: Taylor

摘要:

The radio and optical characteristics of quasi-stellar radio sources are described and contrasted with those of radio galaxies. It is shown how the synchrotron hypothesis of the radio emission from those objects can explain many of the features of their radio spectra. Once a consistent model for the evolution of quasi-stellar radio sources and radio galaxies is sought many difficulties are encountered, particularly during the early stages when the radiation density is very great. However, the present observational data allow several important conclusions to be drawn about the evolution of quasi-stellar radio sources and radio galaxies in general.

ISSN:0010-7514    

DOI:10.1080/00107516708202159

出版商:Taylor & Francis Group    

年代:1967

数据来源: Taylor

摘要:

In December of last year the 4000 Mev electron accelerator of the Science Research Council's Daresbury Laboratory was brought into operation. This article is an account of the physics underlying the design of such an accelerator and briefly describes the physical problem which will be studied with it.

ISSN:0010-7514    

DOI:10.1080/00107516708202160

出版商:Taylor & Francis Group    

年代:1967

数据来源: Taylor

摘要:

Measurements of the Faraday magneto-optical effect and of optical absorption in magnetic garnet crystals and films are reviewed. Earlier work was restricted to measurements in the visible spectrum; these measurements showed that the transparency was sufficient to allow magnetic domains to be studied in relatively thick slabs. Within the last year or so interest has been renewed in extending magneto-optical measurements beyond the visible spectrum. In particular, extremely low absorptions are found in the wavelength range of approximately 1–5 microns. Thie work is, in no small way, spurred by the possibility of developing a light-beam modulator using the Faraday effect in this wavelength range. Recent measurements at very short wavelengths using garnet films are also reported. By extending the short wavelength measurements to 3000 Å, about two orders of magnitude increase in Fareday rotation and optical absorption are observed, compared with the visible spectrum measurements.

ISSN:0010-7514    

DOI:10.1080/00107516708202161

出版商:Taylor & Francis Group    

年代:1967

数据来源: Taylor

摘要:

Electric currents in solids are usually associated with the presence of electrons which are free to move under the influence of a field. In most cases these free current carriers exist in the charge neutral material. In this article the introduction of excess charge is discussed and it is shown how such charge can carry a current. The use of space-charge conduction as a tool in the study of defects and surfaces is discussed. The simultaneous injection of positive and negative charge at opposite electrodes is also considered. The bearing of space-charge conduction on device technology is reviewed.

ISSN:0010-7514    

DOI:10.1080/00107516708202162

出版商:Taylor & Francis Group    

年代:1967

数据来源: Taylor

ISSN:0010-7514    

DOI:10.1080/00107516708202163

出版商:Taylor & Francis Group    

年代:1967

数据来源: Taylor

ISSN:0010-7514    

DOI:10.1080/00107516708202164

出版商:Taylor & Francis Group    

年代:1967

数据来源: Taylor

ISSN:0010-7514    

DOI:10.1080/00107516708202165

出版商:Taylor & Francis Group    

年代:1967

数据来源: Taylor

ISSN:0010-7514    

DOI:10.1080/00107516708202166

出版商:Taylor & Francis Group    

年代:1967

数据来源: Taylor