107 research outputs found
On the reachable states for the boundary control of the heat equation
We are interested in the determination of the reachable states for the
boundary control of the one-dimensional heat equation. We consider either one
or two boundary controls. We show that reachable states associated with square
integrable controls can be extended to analytic functions onsome square of C,
and conversely, that analytic functions defined on a certain disk can be
reached by using boundary controlsthat are Gevrey functions of order 2. The
method of proof combines the flatness approach with some new Borel
interpolation theorem in some Gevrey class witha specified value of the loss in
the uniform estimates of the successive derivatives of the interpolating
function
Null controllability of one-dimensional parabolic equations by the flatness approach
We consider linear one-dimensional parabolic equations with space dependent
coefficients that are only measurable and that may be degenerate or
singular.Considering generalized Robin-Neumann boundary conditions at both
extremities, we prove the null controllability with one boundary control by
following the flatness approach, which providesexplicitly the control and the
associated trajectory as series. Both the control and the trajectory have a
Gevrey regularity in time related to the class of the coefficient in
front of .The approach applies in particular to the (possibly degenerate
or singular) heat equation with a(x)\textgreater{}0
for a.e. and , or to the heat equation with
inverse square potential with
Null controllability of the 1D heat equation using flatness
We derive in a straightforward way the null controllability of a 1-D heat
equation with boundary control. We use the so-called {\em flatness approach},
which consists in parameterizing the solution and the control by the
derivatives of a "flat output". This provides an explicit control law achieving
the exact steering to zero. We also give accurate error estimates when the
various series involved are replaced by their partial sums, which is paramount
for an actual numerical scheme. Numerical experiments demonstrate the relevance
of the approach
Controllability of the 1D Schrodinger equation by the flatness approach
We derive in a straightforward way the exact controllability of the 1-D
Schrodinger equation with a Dirichlet boundary control. We use the so-called
flatness approach, which consists in parameterizing the solution and the
control by the derivatives of a "flat output". This provides an explicit
control input achieving the exact controllability in the energy space. As an
application, we derive an explicit pair of control inputs achieving the exact
steering to zero for a simply-supported beam
Null controllability of the 2D heat equation using flatness
International audienceWe derive in a direct and rather straightforward way the null controllability of the N -dimensional heat equation in a bounded cylinder with boundary control at one end of the cylinder. We use the so-called flatness approach, which consists in param-eterizing the solution and the control by the derivatives of a "flat output". This yields an explicit control law achieving the exact steering to zero. Replacing the involved series by partial sums we obtain a simple numerical scheme for which we give explicit error bounds. Numerical experiments demonstrate the relevance of the approach
Null controllability of the structurally damped wave equation with moving point control
International audienceWe investigate the internal controllability of the wave equation with structural damping on the one-dimensional torus. We assume that the control is acting on a moving point or on a moving small interval with a constant velocity. We prove that the null controllability holds in some suitable Sobolev space and after a fixed positive time independent of the initial conditions
La FasciathĂ©rapie MĂ©thode Danis Bois et la rĂ©cupĂ©ration physique, mentale et somato-psychique du sportif de haut niveau: Evaluation quantitative et qualitative auprĂšs dâune population de sportifs de haut niveau
Tese apresentada Ă Universidade Fernando Pessoa como parte dos requisitos para obtenção do grau de Doutor em CiĂȘncias Sociais, especialidade em PsicopedagogiaThis work focuses on fasciatherapy applied to the recovery of high level athletes
and attempts to answer the question âHow and in what way does fasciatherapy
participate in the physical, mental and somato-psychic recovery of high level athletes?â
In order to do this, I have presented the theoretical side of the therapies addressing the
fascia and in particular the Danis Bois fasciatherapy method, as well as the theoretical
side of physical, psychological and somato-psychic recovery in the field of sports. I
have approached this research from the viewpoint of a practitioner-researcher in order
to gain better understanding of the somato-psychic impact of fasciatherapy on the
recovery of ten high level athletes who are deemed to be "in good shape" and who
practice sports intensively on a daily basis. This research uses a mixed methodology.
The first one is qualitative and is based on interviews. It develops an analysis inspired
by phenomenology on a case by case basis and a transverse hermeneutic interpretation.
The second one is quantitative and uses a questionnaire based on Likert scales. This
research translates the impact of fasciatherapy on seventeen indicators of physical,
psychological and somato-psychic recovery.Ce travail porte sur la fasciathérapie appliquée à la récupération des sportifs de
haut niveau et tente de répondre à la question « En quoi et comment la fasciathérapie
participe-t-elle à la récupération physique, mentale et somato-psychique des sportifs de
haut niveau ? » Pour cela, jâai prĂ©sentĂ© le champ thĂ©orique des thĂ©rapies sâadressant aux
fascias et notamment la fasciathérapie méthode Danis Bois, ainsi que le champ
théorique de la récupération physique, psychique et somato-psychique dans le domaine
du sport. Jâai abordĂ© cette recherche avec une posture de praticien-chercheur afin de
mieux comprendre les impacts somato-psychiques de la fasciathérapie sur la
rĂ©cupĂ©ration de dix sportifs de haut niveau rĂ©putĂ©s « en pleine forme », confrontĂ©s Ă
leur pratique sportive intensive quotidienne. Cette recherche déploie une méthodologie
mixte. La premiÚre, qualitative, est basée sur des entretiens et développe une analyse
dâinspiration phĂ©nomĂ©nologique cas par cas et une interprĂ©tation hermĂ©neutique
tranversale. La seconde, quantitative, est basĂ©e sur un questionnaire Ă base dâĂ©chelles de
Likert. Cette recherche traduit lâimpact de la fasciathĂ©rapie sur dix-sept indicateurs de la
récupération physique, psychique et somato-psychique.Este trabalho sobre a fasciaterapia aplicada à recuperação dos atletas de alto
nĂvel, tenta responder Ă questĂŁo "De que forma a fasciaterapia participa na recuperação
fĂsica, psicolĂłgica e somĂĄtico-psĂquica dos atletas de alta competição?" Para tal, o
trabalho teĂłrico apresentado incide nas terapias fasciais (fascia), nomeadamente a
fasciaterapia mĂ©todo Danis Bois, e na recuperação fĂsica, psicolĂłgica e somĂĄticopsĂquica
no domĂnio desportivo. Assumi esta investigação adoptando uma postura de
praticante-investigador no Ăąmbito de compreender melhor os impactos somatopsĂquicos
da fasciaterapia na recuperação de 10 atletas considerados "em boa forma" e
confrontados a uma pråtica desportiva quotidiana. Esta investigação desenvolve uma
metodologia mista. A primeira, qualitativa, Ă© baseada em entrevistas e desenvolve uma
anĂĄlise de inspiração fenomenolĂłgica caso a caso e uma interpretação hermenĂȘutica
transversal. A segunda, quantitativa, Ă© baseada num questionĂĄrio baseado nas escalas de
Likert. Esta pesquisa reflecte o impacto da fasciaterapia sobre 17 indicadores de
recuperação fĂsica, psicolĂłgica e somĂĄtico-psĂquica
Chapman-Enskog derivation of the generalized Smoluchowski equation
We use the Chapman-Enskog method to derive the Smoluchowski equation from the
Kramers equation in a high friction limit. We consider two main extensions of
this problem: we take into account a uniform rotation of the background medium
and we consider a generalized class of Kramers equations associated with
generalized free energy functionals. We mention applications of these results
to systems with long-range interactions (self-gravitating systems, 2D vortices,
bacterial populations,...). In that case, the Smoluchowski equation is
non-local. In the limit of short-range interactions, it reduces to a
generalized form of the Cahn-Hilliard equation. These equations are associated
with an effective generalized thermodynamical formalism.Comment: In pres
Present eternity : quests of temporality in the literary production of the "extrême contemporain" in France (The Writings of Dominique Fourcade and Emmanuel Hocquard)
The term \uab extr\ueame contemporain \ubb is an expression currently used by scholars to indicate the French literary production of the last 20 years. This term was used in a work of literature for the first time by the French poet Dominique Fourcade in 1986 (\uc9l\ue9gie L apostrophe E.C.) in reference to an epoch, but also to a new sense of experiencing time and space in the so-called \uab age of digital reproducibility \ubb. The aim of this paper is to consider how the change in temporal protocols due to the triumph of Big Optics (Paul Virilio) affects the sense of teleology (destiny) and the quest for experience in French contemporary poetry (in particular, in the genre of the elegy). Including both memory and anticipation, the \uab extr\ueame contemporain \ubb production seems to prefer the \u201ctime of now\u201d, Jetz-zeit in Benjamin\u2019s words, to past or testimony, and speaks to the present, whose responsibility is to give voice to a space where everything is simply allowed to happen
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