Abstract 154

Abstract

Behaviour of materials under high pressure. P. SaviC and R. Kaganin (Serb. Acad. Sci. Monogr. nut. Sci. Math., 1964, 378, No. 34, 64 pp.).-On the basis of models of spherical celestial bodies at O' K, the influence of temp. on the formation of a system of particles under high pressure is discussed, showing that the temp., as a consequence of accumulated energy, is k 7.35 x loB OK. From the relationship between temp. and the mass, radius, moment of inertia and d of a complete spherica1 body of given order, the max. possible mass ( 2 . 6~ loa9 9.) and radius ( 1 . 8 8~ l O l 8 cm.), of a spherical body is determined. From these general results the radius, mass and moment of inertia, the no. of layers, d, temp. and pressure in each layer, height of the atm. and the chemical composition of the sun (H2 63, He 340/) are computed. (In English.) Industrial process control. VIII. Vapour-pressure and gas filled instruments and electric-signal thermometers. IX. Measuring instruments. 0. G. Pamely-Evans (Mech. World, 1964, 144, 462-463; 522-529).-VIII. Peculiarities of v.p. thermometers are discussed with reference to their limitations; including all solid devices such as rod thermostats, gas-filled systems and simple thermocouple circuits.IX. Electrical methods of measuring temp. and instruments for measuring fluid flow are considered, including dynamic and potential head instruments and those depending upon differential pressure or J. M. JACOBS. deflexions caused by restrictions. c. v.Atomic Energy, etc. Plastics in nuclear establishments. H. Wells (Chem. Engr, 1964, CE 271-CE 276).-Basic properties of plastics relevant to their use in nuclear establishments, namely, their resistance to contamination by radioactive substances and to nuclear radiation, and their neutron absorption or attenuation capacities, are discussed, together with the effects of radiation on the chemical structure of plastics and applications of plastics in radiation environments, particularly for the vac. vessels in the 'Nimrod' proton synchroton and as 'rabbit' containers for studying the effects of radiation on materials placed in reactors.Dosimetry of mixed radiations, involving more than one energy or type of radiation, with the R.P.S./A.E.R.E. film dosimeter. B. E. Jones and T. 0. Marshall (J. photogr. Sci., 1964, 12, 319--327).-Use of the R.P.S./A.E.R.E. film holder for the evaluation of radiation doses, e.g. X-, p-and y-radiations, and the interpretation of the results are described. Above but not below G. H. EMMOTT.squares analysis is applied to calculate equilibrium constants and their variation with medium in the solvent extraction equilibria based on a model involving a Debye-Huckel term for low and a linear term for high ionic concn. corrections in the aq. phase. A relatively simple model may be used to describe solvent-extraction equilibria over wide range of concn. of material being extracted, of salting agent, and of extractant; more elaborate systems introduce mathematical difficulties. The analysis detailed specifically the...