摘要:

Itinerant electrons moving in a metal urider the influence of an applied electric field suffer momentum-changing collisions from numerous causes: collision, with their own kind, with native or foreign ions, or with any other deviation from the periodicity of the ideel lattice structure. The subject of much recent research are those collisions which have left-right asymmetry; that is, the scattered electron has an unequal probability of passing to one side of the scatterer rather than to the other. Such Bsymmetric effects are most prominent in the case of ecatteriug by an ion which has a looalized magnetic moment and is in an applied magnetic field, although in principle any mattering centre having an attractive potential can give asymmetric scattering. This erticle gives an elementary and descriptive review of the microscopic processes leading to such scattering, and covers recent developments in their macroscopic manifestations.

ISSN:0010-7514    

DOI:10.1080/00107517508210830

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

This article describes the scientific objectives, the scientific and operational plans and the observational programme of the international Atlantic Tropical Experiment in which some 70 countries pclrticipated during Jun-September 1974. The main aim waa to make, for the first time, an intensive study of the structure, evolution and transport properties of tropical weather systems and their role in the global circulation of the atmosphere as a whole. Some preliminary results are described but it will be two or three years before the vast mass of data is fully processed and analysed and made available in the form of validated data sets for detailed researoh studies and for input to numerical models. However, there is already good reason to believe that the major scientific objectives of the experiment will be achieved and that the knowledge gained will lead to improved weather forecasting both in the tropics, and in middle latitudes where accurate predictions for more than about three days ahead may not be possible without taking into account the import of heat and moiature from the tropical oceans through the large convective clouds of the tropical atmosphere.

ISSN:0010-7514    

DOI:10.1080/00107517508210831

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

This article discusses the several contributions to the magnetic moment of an ion in a crystal and how such individual magnetic moments contribute to the total moment of the crystal as a whole. It deals particularly with Co2+ ions in an insulating host, taking MgF2as an example. when two Co2+ ions are in close proximity, exchange effects occur and give rise to a change in the magnetic moment of each ion in the pair. This is normally described as ag-shift and its implications in concentrated magnetic material are discussed.

ISSN:0010-7514    

DOI:10.1080/00107517508210832

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

Magnetic domain structurea in thick (rw 1 mm) single-orgstal slices of yttrium iron garnet have been observed by a magneto-optic technique using transmitted polarized infrared radiation. The structures revealed that the crystals had a uniaxial or orthorhombic anisotropy that had been induced during growth. haw of the induced anisotropy, the bulk domein structures were markedly different from surface colloid pattern. Domain structures which are chracteristic of the intrinsio magnetocrystalline anieotropy are observed in dices in which the induced anisotropy has bean removed by a heat treatment.

ISSN:0010-7514    

DOI:10.1080/00107517508210833

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

ISSN:0010-7514    

DOI:10.1080/00107517508210834

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

ISSN:0010-7514    

DOI:10.1080/00107517508210835

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

Lectures in Phma Phy&. By C. MebcieR. (Commission of the European Communities, Luxembourg, 1974.) [Pp. 157.1 B.Fr. 500. Scope: Conference proceedings. Level: For specialists only.

ISSN:0010-7514    

DOI:10.1080/00107517508210836

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

ISSN:0010-7514    

DOI:10.1080/00107517508210837

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor