The depolarization effects of Earth-Space link at MMW Bands
The depolarization effects of Earth-Space link at MMW Bands and their mechanisms are analysed. The models to evaluate XPD induced by clear atmosphere, rain, ice crystals, snow, sand-dust storm and ionized layer are summarized and analysed. The methods to calculate total XPD including the influence of transmitting antenna are discussed. The results given in this paper are important for frequency resue and depolarization MIMO techniques.
Radio Wave Propagation
Monograph on Radio-Wave Propagation in the TroposphereProceedings of Commission II on Radio and Troposphere during the XIIIth General Assembly of URSI, London, September 1961. Edited by J. A. Saxton. Pp. viii + 200. (Amsterdam and New York: Elsevier Publishing Company, 1962.) 48s.Monograph on Ionospheric RadioXIIIth General Assembly of URSI, London, September 1960. Edited by W. J. G. Beynon. Pp. vi + 264. (Amsterdam and New York: Elsevier Publishing Company, 1962.) 65s.Monograph on Radio Noise of Terrestrial OriginXIIIth General Assembly of URSI, London, 1960. Edited by F. Horner. Pp. vii + 202. (Amsterdam and New York: Elsevier Publishing Company, 1962.) 48s.Space Radio CommunicationA Symposium held under the Auspices of the International Scientific Radio Union in Paris in September 1961. Edited by G. M. Brown Pp. xii + 630. (Amsterdam and New York: Elsevier Publishing Company, 1962.) 140s.The Measurement of Characteristics of Terrestrial Radio Noise (URSI Special Report No. 7.) Pp. vii + 58. (Amsterdam: Elsevier Publishing Company, 1962.) 25s.Radio Wave Propagation and the IonosphereBy Ya. K. Al'pert. Authorized translation from the Russian. Pp. x + 394. (New York: Consultants Bureau, 1963.) 22.50 dollars.
Experience of using rating scales for the assessment of vocational trainees in general practice.
For two years trainers in the northern half of the south western region have been asked to assess their trainees with a condensed version of the new Manchester rating scales for vocational training in general practice and to send copies to the regional adviser. The condensed version retains the 23 scales but does not include the subscales. Trainers' workshops and comments from individuals suggested that no radical improvements to the scales were required and that they were an adequate statement of what was required from trainees. The response rate of 89% for returning at least one assessment and 38% for returning all three suggested that use of this condensed version would be more feasible than using the full version of the scales. Analysis of 86 first assessments and 48 sets of three assessments showed a range of variation both in trainee ratings and use of individual scales that was consistent with expectations. A lack of significant rank correlations between the scales indicated that each of the scales measured a different characteristic of behaviour. We suggest that the most useful way to achieve systematic assessment of vocational trainees is by the use of the 23 main rating scales, with regional variations where appropriate.