Parcourir Sciences Et Techniques par auteur "712b2f9c2fbd04359555ae554fbc1b1e513facc3"
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Adiabatic invariants drive rhythmic human motion in variable gravity
01 décembre 2020, CeREF TechniqueArticle scientifiqueVoluntary 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, CeREF TechniquePublication d'intérêt général/presseArticle de vulgarisaiton sur le pendule de Foucault -
Anyons in quantum mechanics with a minimal length
15 février 2017, HE Louvain en HainautArticle scientifiqueThe existence of anyons, i.e. quantum states with an arbitrary spin, is a generic feature of standard quantum mechanics in (2+1)-dimensional Minkowski spacetime. Here it is shown that relativistic anyons may exist also in quantum theories where a minimal length is present. The interplay between minimal length and arbitrary spin effects are discussed. -
Capteur, ce movement est-il déconseillé ?
27 octobre 2021, CeREF TechniqueAutreComme tous les systèmes dynamiques, l’Homme est soumis aux lois de la mécanique. Il n’est toutefois pas réductible à une machine comme les autres : il est biologique, psychologique et social ! La douleur, définie comme une expérience sensorielle et émotionnelle désagréable associée à une lésion tissulaire réelle ou non, est une composante de nature complexe. Elle se manifeste notamment dans les ... -
Cinématique du grand battement et du développé chez des danseurs amateurs : effets à court terme d’un étirement statique ou dynamique
11 décembre 2020, HE Louvain en HainautArticle scientifiqueLes jeunes danseurs amateurs semblent utiliser majoritairement l’étirement statique. Or, la littérature montre également l’efficacité de l’étirement dynamique sur la performance des sportifs. L’un de ces étirements est-il dès lors plus favorable à l’exécution de deux mouvements de danse classique, le grand battement et développé ? Seize participants ont réalisé ces mouvements dans trois conditions ... -
Clinical and MRI changes of puborectalis and iliococcygeus after a short period of intensive pelvic floor muscles training with or without instrumentation
13 juin 2018, HE Louvain en HainautArticle scientifiquePurpose This study evaluates the impact of a 3-week period of intensive pelvic floor muscles training (PFMT), with or without instrumentation, on clinical and static magnetic resonance imaging (MRI) changes of puborectalis (PR) and iliococcygeus (IL) muscles. Methods 24 healthy young women were enrolled in the study and 17 achieved the 9 sessions of 30 min training exercises and conducted all ... -
Compte rendu de : "Mee (Nicholas), Celestial Tapestry : The Warp and Weft of Art and Mathematics"
2022, HE Louvain en HainautRapportIl s'agit du compte rendu du livre : "Mee (Nicholas), Celestial Tapestry : The Warp and Weft of Art and Mathematics. – Ox ford : Oxford University Press, 2020. – 325 p. – 1 vol. broché de 20 × 13 cm. – 16,99 £. – isbn 978-0-19-885195-0". -
Compte rendu de Harry M. Collins : «Gravity's kiss : the detection of gravitational waves»
01 janvier 2018, HE Louvain en HainautRapportCompte rendu de Harry M. Collins : «Gravity's kiss : the detection of gravitational waves» -
Compte rendu de Hermann Weyl : «Philosophie des mathématiques et des sciences de la nature»
01 octobre 2019, HE Louvain en HainautRapportCompte rendu de Hermann Weyl : «Philosophie des mathématiques et des sciences de la nature» -
Compte rendu de Nicolas Beck : «En finir avec les idées reçues sur la vulgarisation scientifique»
01 janvier 2017, HE Louvain en HainautRapportCompte rendu de Nicolas Beck : «En finir avec les idées reçues sur la vulgarisation scientifique» -
Compte rendu de Patrick Tort : «Qu'est-ce que le matérialisme ? Introduction à l'analyse des complexes discursifs»
01 janvier 2017, HE Louvain en HainautAutreCompte rendu de Patrick Tort : «Qu'est-ce que le matérialisme ? Introduction à l'analyse des complexes discursifs» -
Diffusion in Phase Space as a Tool to Assess Variability of Vertical Centre-of-Mass Motion during Long-Range Walking
06 février 2023, CeREF SantéCeREF TechniqueArticle scientifiqueWhen a Hamiltonian system undergoes a stochastic, time-dependent anharmonic perturbation, the values of its adiabatic invariants as a function of time follow a distribution whose shape obeys a Fokker–Planck equation. The effective dynamics of the body’s centre-of-mass during human walking is expected to represent such a stochastically perturbed dynamical system. By studying, in phase space, the ... -
DYSKIMOT: An Ultra-Low-Cost Inertial Sensor to Assess Head’s Rotational Kinematics in Adults during the Didren-Laser Test
04 février 2020, CERISICArticle scientifiqueVarious noninvasive measurement devices can be used to assess cervical motion. The size, complexity, and cost of gold-standard systems make them not suited to clinical practice, and actually difficult to use outside a dedicated laboratory. Nowadays, ultra-low-cost inertial measurement units are available, but without any packaging or a user-friendly interface. The so-called DYSKIMOT is a home-designed, ... -
Ergonomic Risk Assessment of Developing Musculoskeletal Disorders in Workers with the Microsoft Kinect: TRACK TMS
19 octobre 2018, CeREF TechniqueArticle scientifiqueCompte rendu de la conférence JETSAN 2017 -
Fine adaptive precision grip control without maximum pinch strength changes after upper limb neurodynamic mobilization
30 juin 2021, HE Louvain en HainautArticle scientifiqueBefore and immediately after passive upper limb neurodynamic mobilizations targeting the median nerve, grip ( GF ) and load ( LF ) forces applied by the thumb, index and major fingers (three-jaw chuck pinch) were collected using a manipulandum during three different grip precision tasks: grip-lifthold- replace (GLHR), vertical oscillations (OSC), and vertical oscillations with up and down ... -
A First-Quantized Model for Unparticles and Gauge Theories around Conformal Window
02 décembre 2021, CeREF TechniqueArticle scientifiqueWe first quantize an action proposed by Casalbuoni and Gomis in 2014 that describes two massless relativistic scalar particles interacting via a conformally invariant potential. The spectrum is a continuum of massive states that may be interpreted as unparticles. We then obtain in a similar way the mass operator for a deformed action in which two terms are introduced that break the conformal symmetry: ... -
The Formulations of Classical Mechanics with Foucault’s Pendulum
01 octobre 2020, CERDECAMArticle scientifiqueSince 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. ... -
Gravitating Bubbles of Gluon Plasma above Deconfinement Temperature
13 octobre 2020, CeREF TechniqueArticle scientifiqueThe 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 ... -
Hadrons, Charmé et Beauté
04 mai 2021, CeREF TechniqueAutreSéminaire donné le 4 mai 2021 pour le département de Physique (UMONS) -
Head Pitch Angular Velocity Discriminates (Sub-)Acute Neck Pain Patients and Controls Assessed with the DidRen Laser Test
06 avril 2022, CeREF TechniqueArticle scientifiqueUnderstanding neck pain is an important societal issue. Kinematic data from sensors may help to gain insight into the pathophysiological mechanisms associated with neck pain through a quantitative sensorimotor assessment of one patient. The objective of this study was to evaluate the potential usefulness of artificial intelligence with several machine learning (ML) algorithms in assessing neck ...