By Alan H. Batten (auth.), Elias G. Mariolopoulos, Pericles S. Theocaris, L. N. Mavridis (eds.)
When we first approached a few colleagues allover the area to sound them a few quantity devoted to Professor John Xanthakis at the get together of finishing twenty-five years of clinical actions as fellow of the nationwide Academy of Athens, any attainable doubts as to the feasibility of the undertaking have been quick dispelled by means of their hot and inspiring reaction. very quickly 50 authors from 15 international locations, coming from quite a lot of Professor Xanthakis' rapid colleagues, scholars and acquaintances joined to supply the 36 contributions incorporated during this quantity. a few of those that the place initially approached came across themselves un capable of give a contribution, end result of the time-limit inevitably imposed. Happi ly, they have been simply few in quantity, and we must always wish to list our grat itude to them for his or her strong needs for the luck of the enterprise. Their hot phrases have been one of many resources of inspiring encouragement prolonged to us.
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Extra resources for Compendium in Astronomy: A Volume Dedicated to Professor John Xanthakis on the Occasion of Completing Twenty-five Years of Scientific Activities as Fellow of the National Academy of Athens
Mln. 40362 31. 2 We have found similar results when ~ takes the values 60 0 , 120 0 , o 0 0 150 , 1,0 . In all tested cases the adiabatic invariant is much better conserved than the total energy. However, the constancy of J depends on ~ , so that J is better conserved as ~ becomes larger. o 4. 0 CONCLUSIONS The paper studies the behaviour of adiabatic invariants: a) at the main resonances of the Mathieu equation b) in the case of the transition of a pendulum from oscillating to circulating motion.
Any dust clump within the cloud will undergo, in the vicinity of a B star, a shearing stress and become elongated in a way recalling the formation of cirrus clouds in the Earth's atmosphere, through the shearing of ice crystal clumps by differential wind speeds. 43 E. G. Mariolopoulos et al. ), Compendium in Astronomy, 43-54. Copyright © 1982 by D. Reidel Publishing Company. 44 P. BOUVIER We shall not deal here with the ray-like filaments, possibly originating, according to Arny (1911), in matter stripped off from circumstellar envelopes associated with low-luminosity stars.
This, of course, is but a rough estimate. One is led to the conclusion, on the ground of all that has been said in the present paper, that the astronomical activity and development in the period 1600-1880 has not been considerably impeded by the elaborating of catalogues, even though the working out of the catalogues has been the principal preoccupation of many astronomers, absorbing much of their active time. We are led to this conclusion by Fig. 2 where a clear "de- ASTRONOMICAL ACTNITY IN THE PERIOD 1600 TO 1880 27 tachment" of the general astronomical activity of the one connected with the catalogue constructing is noticeable after the middle of l7th century.