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See detailVibrational stability of G plus modes towards non-radial oscillations for solar models
Noels-Grötsch, Arlette ULg; Gabriel, Maurice ULg; Boury, A. et al

in Mémoires de la Societe Royale des Sciences de Liège (1975), 8

The vibrational stability of solar models towards g plus modes has been studied from the Zero Age Main Sequence (ZAMS) up to the age of 5 billion yr. The nuclear energy contribution to instability is ... [more ▼]

The vibrational stability of solar models towards g plus modes has been studied from the Zero Age Main Sequence (ZAMS) up to the age of 5 billion yr. The nuclear energy contribution to instability is calculated with the effective sensitivity of the reactions to change of temperature. The perturbation of convective terms is taken from an extension for nonradial oscillations of Unno's theory. The ZAMS model and the present sun are stable. However, for intermediate ages, models are unstable with respect to the lowest modes due to the effects of nuclear reactions. If, moreover, the mechanical effects of convection are taken into account, all models are unstable. However their theory is uncertain enough to require caution. [less ▲]

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See detailPhénomènes de fluorescence dans les astres.
Swings, Polydore ULg

in Mémoires de la Societe Royale des Sciences de Liège (1971), 1

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See detailFree radicals in astrophysics.
Swings, Polydore ULg

in Mémoires de la Societe Royale des Sciences de Liège (1969), XVIII(3), 7-26

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See detailConsideration of the forbidden lines of iron in the states from Fe0 to Fe6+
Swings, Polydore ULg; Swings, Jean-Pierre ULg

in Mémoires de la Societe Royale des Sciences de Liège (1969), 17

The iron atom which has a fairly high cosmic abundance presents the great interest of appearing in a wide variety of stars and nebulae, at many stages of ionization, and of revealing forbidden transitions ... [more ▼]

The iron atom which has a fairly high cosmic abundance presents the great interest of appearing in a wide variety of stars and nebulae, at many stages of ionization, and of revealing forbidden transitions in emission in many of these ionization stages. The present paper discusses the following topics : (a) the case of the as yet undiscovered forbidden lines of neutral iron (Fe0) ; (b) some recently acquired astronomical information on the forbidden lines of the stages Fe+ to Fe6+ ; (c) general considerations on the important information revealed by these forbidden lines of iron on the physical structure and excitation mechanisms which are present in the emission line stars of early and late types. For lack of time we give only a very summarized version of our paper ; a complete text will appear later. [less ▲]

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See detailConsidérations relatives à la distribution des conditions physiques au sein des atmosphères stellaires
Swings, Polydore ULg

in Mémoires de la Societe Royale des Sciences de Liège (1938), III

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See detailSur la probabilité de désactivation par chocs intermoléculaires, dans le cas des émissions fluorescentes
Swings, Polydore ULg

in Mémoires de la Societe Royale des Sciences de Liège (1931), XVI

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See detailNote sur un procédé simple permettant l'étude en laboratoire, des méthodes de photométrie stellaire photographique
Swings, Polydore ULg; Legros, A.

in Mémoires de la Societe Royale des Sciences de Liège (1930), XV

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See detailTraité des réductions stellaires
Folie, François ULg

in Mémoires de la Societe Royale des Sciences de Liège (1888), 2e série, t. 14

The author demonstrates the formulae on stellar reductions and puts them sheltered from the errors or the negligence that occur in the usual formulae, before making use of it for the determination of ... [more ▼]

The author demonstrates the formulae on stellar reductions and puts them sheltered from the errors or the negligence that occur in the usual formulae, before making use of it for the determination of constants nutation and annual aberration. [less ▲]

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See detailDouze tables pour le calcul des réductions stellaires
Folie, François ULg

in Mémoires de la Societe Royale des Sciences de Liège (1883)

This publication contains twelve tables intended to facilitate various calculation of astronomical reductions: tables I to V that of the precession, tables VI to X that of the nutation and tables XI to ... [more ▼]

This publication contains twelve tables intended to facilitate various calculation of astronomical reductions: tables I to V that of the precession, tables VI to X that of the nutation and tables XI to XII that of some other usual reductions. [less ▲]

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See detailTables des lignes trigonométriques naturelles et des inverses des nombres
Folie, François ULg

in Mémoires de la Societe Royale des Sciences de Liège (1882), 2e série, t. 9

The author built a table of the natural trigonometric lines to calculate some astronomical reductions. It is arranged in two tables, one with the sine, cosine and tangent, the other with the secant or ... [more ▼]

The author built a table of the natural trigonometric lines to calculate some astronomical reductions. It is arranged in two tables, one with the sine, cosine and tangent, the other with the secant or cosecant cotangents. [less ▲]

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See detailEléments d'une théorie des faisceaux
Folie, François ULg

in Mémoires de la Societe Royale des Sciences de Liège (1878)

The author summarizes twelve years of studies on the geometry. He managed to extend to plane curves and to upper surfaces most of the fundamental theorems, which only applied to conics.

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See detailNote sur l'extension des théorèmes de Pascal et de Brianchon aux courbes planes et aux surfaces du 3e ordre ou de la 3e classe
Folie, François ULg

in Mémoires de la Societe Royale des Sciences de Liège (1873), 2e série, t. 3

The author wants some theorems to be know, theorems to which he arrived in conducting researchs on Pascal's theorem on surfaces and plane curves of the 3rd order, and the Brianchon’s theorem on surfaces ... [more ▼]

The author wants some theorems to be know, theorems to which he arrived in conducting researchs on Pascal's theorem on surfaces and plane curves of the 3rd order, and the Brianchon’s theorem on surfaces and plane curves of the 3rd class. [less ▲]

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See detailNouvelle manière de présenter la théorie de la divisibilité des nombres
Folie, François ULg

in Mémoires de la Societe Royale des Sciences de Liège (1873), 2e série, t. 3

The author makes the theory of divisibility of numbers independent from that of the search for the greatest common divisor and formulates a principle allowing to discover the type of divisibility of a ... [more ▼]

The author makes the theory of divisibility of numbers independent from that of the search for the greatest common divisor and formulates a principle allowing to discover the type of divisibility of a number by a prime number without being necessary to look for residual of the division of basis powers by the prime number. [less ▲]

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See detailExposition nouvelle des principes du calcul différentiel et du calcul intégral
Brasseur, Jean-Baptiste; Folie, François ULg

in Mémoires de la Societe Royale des Sciences de Liège (1873), 2e série, t. 3

J.-B. Brasseur’s work on a new exposition the differential and integral calculus principles, together with of François Folie’s foreword analyzing some different points of view from which we can consider ... [more ▼]

J.-B. Brasseur’s work on a new exposition the differential and integral calculus principles, together with of François Folie’s foreword analyzing some different points of view from which we can consider its calculations [less ▲]

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See detailNouvelles tables usuelles des logarithmes des nombres naturels et des lignes trigonométriques et tables inverses, en deux feuilles, accompagnées d'une introduction renfermant un précis de trigonométrie pure, ainsi que la disposition et l'usage de ces tables
Folie, François ULg

in Mémoires de la Societe Royale des Sciences de Liège (1866), 2e série, t. 1

The author introduces the logarithms tables and pure trigonometric lines. He indicates the arrangement and use of logarithms tables of numbers and the inverse table that he borrowed from Struve, and ... [more ▼]

The author introduces the logarithms tables and pure trigonometric lines. He indicates the arrangement and use of logarithms tables of numbers and the inverse table that he borrowed from Struve, and trigonometric tables he built on the same plan. [less ▲]

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