摘要:

Tracks produced by 5·7 Bev protons in nuclear emulsions have been followed till they interact with emulsion nuclei, and a mean free path of 35·6 × 2·4 cm has been obtained. About 24% of the shower tracks are found to be protons, all of which emerge at angles less than 20% with the direction of the primary. The mean multiplicity of pion production is found to be 2·6 ± 0·3, the coefficient of inelasticity 0·49 ± 0·07, and the transverse momentum of pions 220 ± 30 Rev/c.

ISSN:0031-8086    

DOI:10.1080/14786436008241207

出版商:Taylor & Francis Group    

年代:1960

数据来源: Taylor

摘要:

An attempt is made to interpret the horizontal ‘drift velocities’ observed in ionospheric fading-wave experiments by examining statistically the fluctuations in space and time of the density of ions and electrons. The ionization is assumed to be convicted by a turbulent flow in the neutral air, but the magnetic field and the dynamo electric field are also taken into account. The drift velocity to be calculated is defined by means of the space-time correlation function.

ISSN:0031-8086    

DOI:10.1080/14786436008241208

出版商:Taylor & Francis Group    

年代:1960

数据来源: Taylor

摘要:

Single-crystal films of silver were made by evaporation of silver onto the cleavage surface of a heated rock-salt crystal. The crystalline defects present in the detached films were studied by transmission electron microscopy. In fresh areas of the foil, numerous simple stacking faults confined to a single plane were observed. The number varied between 5 × 109and 1 × 1010cm−2. There was a strong tendency for the partial dislocations to lie in ⟨110⟩ directions. The morphology of the simple fault shapes resulting is considered in detail. Electron beam stressing resulted in the dissociation of whole dislocations and in the widening of faults already present. The interaction of the faults to form complex faults on several planes, and the effects of holes and dislocations were studied. Some areas showed minor defects consisting of dislocation loops and tetrahedral stacking faults. Preliminary annealing experiments indicate that the simple faults are remarkably stable at 300°c. The origin of the various defects is discussed. It is concluded that most simple faults probably form by dissociation of dislocations which may (1) grow in from the substrate, (2) nucleate at silver patch edges during growth, (3) form by impingement of patches on a {110} plane during growth.

ISSN:0031-8086    

DOI:10.1080/14786436008241209

出版商:Taylor & Francis Group    

年代:1960

数据来源: Taylor

摘要:

The solar diurnal variation of the cosmic ray meson intensity caused by the periodic solar heating of the atmosphere is derived from a comparison of the ionization chamber and neutron monitor data from Huancayo. The amplitude and the time of maximum are found to be 0·11% and 05–30 hr respectively. Recent meteorological data, free from appreciable radiation errors, are found to be in rough agreement with this result. Particularly good agreement is obtained in the phases which are both later than the value given by Dorman by about 4 hr. The inclusion of this temperature correction enables the directional measurements at Mawson to be reconciled with the idea of a primary anisotropy.

ISSN:0031-8086    

DOI:10.1080/14786436008241210

出版商:Taylor & Francis Group    

年代:1960

数据来源: Taylor

摘要:

It is shown that the general characteristics of the cosmic-ray intensity variations can be explained in terms of a large-scale interplanetary magnetic field of predominantly dipole character but containing small-scale irregularities which act as scattering centres. It is suggested that the cosmic-ray data can be taken as evidence for the existence of such a field. The strength of the field, which is generated by current systems in the solar corona, is dependent on the level of solar activity but must in general be in the region of 10-5to 10-4gauss at the earth's orbit.

ISSN:0031-8086    

DOI:10.1080/14786436008241211

出版商:Taylor & Francis Group    

年代:1960

数据来源: Taylor

摘要:

Transmission electron microscopy has been applied to the study of lattice defects introduced by neutron irradiation of graphite. The dark-field technique has proved to be especially useful for this purpose. The technique of preparation is described and a tentative interpretation of the observations is given.

ISSN:0031-8086    

DOI:10.1080/14786436008241212

出版商:Taylor & Francis Group    

年代:1960

数据来源: Taylor

摘要:

A solution of the non-linear differential equations of a domain boundary is reported for the case of a thin film in which the demagnetizing energy associated with the magnetization at right angles to the plane of the film is included. The solution leads to a proposal for the internal structure of the cross-tie wall which has been observed in thin films of permalloy. The effects of the magnetic poles in this model of a cross-tie wall are discussed and compared with observations. The energy density of the wall is suggested to be about 10 ergs/cm2and the correlation between cross-tie spacing and length is derived.

ISSN:0031-8086    

DOI:10.1080/14786436008241213

出版商:Taylor & Francis Group    

年代:1960

数据来源: Taylor

摘要:

The regions where injected helium atoms first appear as gas bubbles are those where thermal vacancies originate. Microscopic examination of metals, injected with helium by using them as targets for energetic alpha-particles, reveals grain boundaries as the principal suppliers of vacancies. Detailed examination distinguishes those boundaries which generate vacancies from those which merely conduct them. The behaviour and nature of these boundaries and other vacancy sources are discussed.

ISSN:0031-8086    

DOI:10.1080/14786436008241214

出版商:Taylor & Francis Group    

年代:1960

数据来源: Taylor

摘要:

Solid State Physics in Electronics and Communications.Vol. 1, Part 1, Semiconductors. Edited by M. DéASIRANT and J. L. Michiels. (London and New York: Academic Press, 1960.) [Pp. 638.] £6 8s.6d.

ISSN:0031-8086    

DOI:10.1080/14786436008241215

出版商:Taylor & Francis Group    

年代:1960

数据来源: Taylor