摘要:

The results of a recent nation-wide survey are used to describe the present situation of Physics in Spain. A brief history, relationship with national technology and comments on foreseeable prospects are also included.

ISSN:0010-7514    

DOI:10.1080/00107517908210918

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

There has been a considerable upsurge of interest in musical acoustics over the last 10 to 15 years and this article is an attempt to summarize the present position in this multidisciplinary field. It first looks at the essential physics involved, reduced to its simplest terms, goes on to consider the relationships between real musical instruments and the resonance tubes and sonometers of the old text-books on ‘sound’ and outlines the history of the subject up to the Second World War. The main section then discusses areas of current study and the relevant measurement techniques in relation to three of the main groups of musical instruments. The article concludes with a discussion of some aspects of the difficult, but all-important, subject of psycho-physics and a brief attempt to predict the future prospects for research in musical acoustics

ISSN:0010-7514    

DOI:10.1080/00107517908210919

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

Defects and impurities affect many of the properties of solids which have practical importance. These include optical, electrical and mechanical behaviour, as well as stability against degradation. Accurate quantitative calculations are now possible in quite a few cases. This article describes the ideas and methods involved, including some of the ways basic understanding can help in applied problems.

ISSN:0010-7514    

DOI:10.1080/00107517908210920

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

This article outlines the early development of the undulator in which an electron beam travelling through a system of magnetic fields with directions alternating in space emits a species of linearly polarized synchrotron radiation peaked at a wavelength which is short compared to the magnet period when the electron energy is high compared with the rest energy. The conditions of synchronism and the departure from synchronism that leads to gain during a single passage of the beam are examined. In later developments, stemming from this, single pass gain of circularly polarized radiation was experimentally demonstrated by means of a ‘twister’ structure and an optical cavity, obtained by adding mirrors to the magnet assembly, was used to achieve build-up of the radiation in an oscillator device known as the ‘free-electron laser’. Applications of this device and further theoretical developments are discussed.

ISSN:0010-7514    

DOI:10.1080/00107517908210921

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

ISSN:0010-7514    

DOI:10.1080/00107517908210922

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

Gay-Lussac, Scientist and Bourgeois.By Maurice Crosland. (Cambridge: Cambridge University Press, 1978.) [Pp. 333.] £15·00.

ISSN:0010-7514    

DOI:10.1080/00107517908210923

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

ISSN:0010-7514    

DOI:10.1080/00107517908210924

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

ISSN:0010-7514    

DOI:10.1080/00107517908210925

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor