By Charles Coulston Gillispie

ISBN-10: 0684169681

ISBN-13: 9780684169682

Show description

Read or Download Dictionary of Scientific Biography. Volume 12. IBN RUSHD - JEAN-SERVAIS STAS PDF

Best dictionaries & thesauruses books

The American Heritage Book of English Usage: A Practical and Authoritative Guide to Contemporary English

For the 1st time, the editors of the acclaimed American Heritage(R) Dictionary have utilized their efforts to notice utilization as its personal topic. the result's this sensible advisor that comes with chapters on grammar, kind, diction, gender, social teams, pronunciation, be aware formation, technology phrases, and a topic and a notice index.

Power Quotes

During this easy-to-use and fun-to-read selection of greater than 4,000 prices, politicians and philosophers, poets and clergymen, CEOs and comedians all percentage their perspectives on management and liberty, treason and triumph, sacrifice and scandal, hazard and uprising, weak point and conflict, and different affaires politiques.

Historical Dictionary of the Republic of Croatia (Historical Dictionaries of Europe)

The Republic of Croatia is likely one of the new international locations that resulted from the cave in of the previous Yugoslavia. To its personal humans, notwithstanding, it's a very previous state with a long-awaited probability to forge a country. during this revised version, the writer is helping readers to appreciate what occurred to Croatia and why, and the present prestige of the divided kingdom greater than 10 years after it grew to become a brand new kingdom.

Animal Patents: The Legal, Economic and Social Issues

Following the united states Patent Office's statement in 1987 that it considers animals "to be patentable material in the scope" of patent legislation, there was significant around the globe debate in this topic. This paintings contains the court cases of the Animal Patents Symposium held at Cornell college, united states, on December 5-6, 1988, prepared through the editor of this paintings.

Additional resources for Dictionary of Scientific Biography. Volume 12. IBN RUSHD - JEAN-SERVAIS STAS

Example text

To him the most interesting result was the correlation between the spectral types and absolute magnitudes of different stars . For those of known parallax, the absolute magnitude decreased systematically from type B to type M-that is, from stars of high surface temperature to those of low surface temperature . This conclusion seemed contrary to the general opinion that many cool, red 18 RUSSELL RUSSELL stars were at great distances and thus were of high luminosity . Russell pointed out that such stars were systematically excluded from parallax studies (since the parallax was undetectably small) and that all the known data could be accounted for under the assumption of two distinct groups of red stars .

At Cambridge . Russell learned about astrometric methods from Hinks . and in 1903 they embarked upon a program of photographically determining stellar parallaxes . Their two main objectives were to find the most suitable compromise between the amount of work done and the accuracy achieved, and to eliminate all known sources of systematic error . Because photographic techniques in astrometry were still plagued with difficulties and were generally considered inferior to visual observations, Hinks and Russell found it desirable to reconsider the entire observing procedure .

Using the sun as a standard, they analyzed seven stars on the basis of high-dispersion spectra taken with the I00-inch telescope . In calculating the relative populations of excited states of atoms in different stars, they found-as expected-that in hotter stars the population of higher states was greater . In the cooler stars, however, the dependence on excitation potential was not what was expected (the Adams-Russell effect), leading them to believe that the atmospheres of cool stars were 21 RUSSELL RUSSELL not in thermodynamic equilibrium .

Download PDF sample

Dictionary of Scientific Biography. Volume 12. IBN RUSHD - JEAN-SERVAIS STAS by Charles Coulston Gillispie

by Jeff

Rated 4.78 of 5 – based on 11 votes