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Adiabatic invariants drive rhythmic human motion in variable gravity
01 décembre 2020, Boulanger, Nicolas; BUISSERET, Fabien; DIERICK, Frédéric; Dehouck, Victor; White, Olivier,
- CeREF Technique
,
- Article scientifique
Article scientifique
Voluntary human movements are stereotyped. When modeled in the framework of classical mechanics they are expected to minimize cost functions that may include energy, a natural candidate from a physiological point of view also. In time-changing environments, however, energy is no longer conserved—regardless of frictional energy dissipation—and it is therefore not the preferred candidate for any cost ...
Alice et le Pendule : au pays des variables actions-angles
27 octobre 2020, BUISSERET, Fabien; Boulanger, Nicolas,
- CeREF Technique
,
- Publication d'intérêt général/presse
Publication d'intérêt général/presse
Gravitating Bubbles of Gluon Plasma above Deconfinement Temperature
Article scientifique
The equation of state of SU(3) Yang–Mills theory can be modelled by an effective Z3−
symmetric potential depending on the temperature and on a complex scalar field ϕ
. Allowing ϕ
to be dynamical opens the way to the study of spatially localized classical configurations of the scalar field. We first show that spherically symmetric static Q-balls exist in the range (1−1.21)×Tc
, Tc
being the ...
The Formulations of Classical Mechanics with Foucault’s Pendulum
Article scientifique
Since the pioneering works of Newton (1643–1727), Mechanics has been constantly reinventing itself: reformulated in particular by Lagrange (1736–1813) then Hamilton (1805–1865), it now offers powerful conceptual and mathematical tools for the exploration of dynamical systems, essentially via the action-angle variables formulation and more generally through the theory of canonical transformations. ...
« NOMADe » Le projet INTERREG pour les Troubles Neuro-Musculo-Squelettiques (TNMS)
01 septembre 2020, BUISSERET, Fabien; DIERICK, Frédéric,
- CeREF Technique
,
- Publication d'intérêt général/presse
Publication d'intérêt général/presse