977 resultados para Demmon, Isaac Newton, 1842-1920.
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"A short account of the life of the author, written by himself": v. 3, p. [v]-xxii.
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"An account of the life and writings of the author": p. [i]-xxvi.
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Mode of access: Internet.
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"Finding that all the editions of the Principia are now out of print, we have been induced to reprint Newtonʾs last edition without note or comment, only introducing the "Corrigenda" of the old copy and correcting typographical errors."--Editorsʾ notice.
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Mode of access: Internet.
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Bookseller's advertisement, [2] pages at end.
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Mode of access: Internet.
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Vastine kosmologian professori Kari Enqvistin kysymykseen artikkelissa "Onko fysiikka filosofiaa?" (TT-lehdessä 2/2006)
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Referee-artikkeli
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Resumen basado en el de la publicaci??n
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Mode of access: Internet.
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The "Life of Sir Isaac Newton" is substantially a translation from that in the "Biographie universelle", by M. Biot. cf. note at head of article.
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Context. Star activity makes the mass determination of CoRoT-7b and CoRoT 7c uncertain. Investigators of the CoRoT team proposed several solutions, but all but one of them are larger than the initial determinations of 4.8 +/- 0.8 M(Earth) for CoRoT-7b and 8.4 +/- 0.9 M(Earth) for CoRoT 7c. Aims. This investigation uses the excellent HARPS radial velocity measurements of CoRoT-7 to redetermine the planet masses and to explore techniques for determining mass and orbital elements of planets discovered around active stars when the relative variation in the radial velocity due to the star activity cannot be considered as just noise and can exceed the variation due to the planets. Methods. The main technique used here is a self-consistent version of the high-pass filter used by Queloz et al. (2009, A&A, 506, 303) in the first mass determination of CoRoT-7b and CoRoT-7c. The results are compared to those given by two alternative techniques: (1) the approach proposed by Hatzes et al. (2010, A&A, 520, A93) using only those nights in which two or three observations were done; (2) a pure Fourier analysis. In all cases, the eccentricities are taken equal to zero as indicated by the study of the tidal evolution of the system. The periods are also kept fixed at the values given by Queloz et al. Only the observations done in the time interval BJD 2 454 847-873 are used because they include many nights with multiple observations; otherwise, it is not possible to separate the effects of the rotation fourth harmonic (5.91 d = P(rot)/4) from the alias of the orbital period of CoRoT-7b (0.853585 d). Results. The results of the various approaches are combined to give planet mass values 8.0 +/- 1.2 M(Earth) for CoRoT-7b and 13.6 +/- 1.4 M(Earth) for CoRoT 7c. An estimation of the variation of the radial velocity of the star due to its activity is also given. Conclusions. The results obtained with three different approaches agree to give higher masses than those in previous determinations. From the existing internal structure models they indicate that CoRoT-7b is a much denser super-Earth. The bulk density is 11 +/- 3.5 g cm(-3), so CoRoT-7b may be rocky with a large iron core.