摘要:

The transition between the liquid or rubbery state and the glassy state is not sharp, but a glass temperature can be defined in terms of measurements of volume or heat capacity. This temperature can be related to the relaxation regions in visco-elastic or dielectric behaviour. Theories of the glass transition relate this variously to molecular relaxations, to free volume and to excess enthalpy or entropy; these are not altogether mutually exclusive. Observed transition temperatures can be related qualitatively with molecular structure, but a quantitative treatment faces formidable difficulties. Properties of glassy polymers reflect the generally low cohesion and the frozen-in disorder and hole structure. Relaxation behaviour is observed in the vicinity of the glass temperature.

ISSN:0010-7514    

DOI:10.1080/00107517008204410

出版商:Taylor & Francis Group    

年代:1970

数据来源: Taylor

摘要:

Electrically charged elementary particles may be incorporated into atoms and molecules. A negatively charged particle may replace an electron while a positively charged particle may capture an electron forming an entity having many properties similar to those of an H atom. These unusual types of atom or molecule have many applications ranging from catalysing nuclear fusion, probing both the charge and nuclear matter distribution in a nucleus, providing accurate methods of measurement of fundamental constants and acting as tracing atoms for monitoring chemical reactions of atomic hydrogen.

ISSN:0010-7514    

DOI:10.1080/00107517008204411

出版商:Taylor & Francis Group    

年代:1970

数据来源: Taylor

摘要:

The theory of nuclear β-decay has developed in two stages. The presentation of Pauli's neutrino hypothesis at the 1933 Solvay Conference initiated the first stage, and a period of renewed activity followed the discovery in 1957 that parity was not conserved in the process. Two distinct interactions, of polar vector and axial vector form respectively, are responsible for β-decay, and the neutron is itself the most suitable β-active nucleus with which to study the basic properties of these interactions. For this reason a continuing effort has been made to refine and improve the precision of measurements on the β-decay of the neutron. In this article the most important features of the phenomenon of β-radioactivity are summarized, the techniques employed to study the radioactivity and related properties of free neutrons are discussed in some detail, and the experimental results interpreted in terms of established theory in the field of weak interactions.

ISSN:0010-7514    

DOI:10.1080/00107517008204412

出版商:Taylor & Francis Group    

年代:1970

数据来源: Taylor

摘要:

After dealing with the main structure-to-property relations for plastic materials, this article outlines the most important lines of development for polymers. As illustrations of the above concept a few examples of short-range application are given, subdivided into different industrial sectors.

ISSN:0010-7514    

DOI:10.1080/00107517008204413

出版商:Taylor & Francis Group    

年代:1970

数据来源: Taylor

ISSN:0010-7514    

DOI:10.1080/00107517008204414

出版商:Taylor & Francis Group    

年代:1970

数据来源: Taylor

摘要:

Induced Representations of Groups and Quantum Mechanics. By G. W. Mackey. (W. A. Benjamin, 1968.) [Pp. vii + 167.] Cloth, $8.50; paper, $3.95. Scope: Library. Level: For specialists only.

ISSN:0010-7514    

DOI:10.1080/00107517008204415

出版商:Taylor & Francis Group    

年代:1970

数据来源: Taylor