Search results for "presque"

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Optimal control and applications to orbital transfer and almost-riemannian geometry

2010

In this thesis we focus on optimal control techniques as well as geometric control techniques applied to the orbital transfer problem and to almost-Riemannian geometry. In these cases, Pontryagin’s Maximum Principle allows to analyse the extremal flow of affine control systems.In the case of a satellite with low-thrust propulsion, averaging techniques give an approximated system. Averaging is explicit in the energy minimization case and is directly related to almost-riemannian problems. The geometric analysis of such problems is generalized by the study of metrics on the two-sphere of revolution. In this way it is possible to classify the situations considering the transcendance of the solu…

[SPI.OTHER]Engineering Sciences [physics]/OtherMéthode de tirHomotopieLieux de coupure et de conjugaison[ SPI.OTHER ] Engineering Sciences [physics]/Other[SPI.OTHER] Engineering Sciences [physics]/Other[ MATH.MATH-GM ] Mathematics [math]/General Mathematics [math.GM]Géométrie presque-riemannienneMoyennation[MATH.MATH-GM] Mathematics [math]/General Mathematics [math.GM]Transfert orbitalProblèmes riemanniens en deux dimensions[MATH.MATH-GM]Mathematics [math]/General Mathematics [math.GM]Contrôle optimalNo english keywordsLanceurs
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Une approximation presque parfaite : étude diachronique de "presque"

2014

OS nat Axe 3; National audience; no abstract

presque[ SHS.LANGUE ] Humanities and Social Sciences/Linguisticsdiachronique[SHS.LANGUE]Humanities and Social Sciences/Linguistics[SHS.LANGUE] Humanities and Social Sciences/Linguistics
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