Sciences Et Techniques: Recent submissions
Voici les éléments 1-20 de 44
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Q-balls and charged Q-balls in a two-scalar field theory with generalized Henon-Heiles potential
30 avril 2024, CeREF TechniqueArticle scientifiqueWe construct Q-ball solutions from a model consisting of one massive scalar field ξ and one massive complex scalar field ϕ interacting via the cubic couplings g1ξϕ ϕ þ g2ξ3, typical of Henon-Heiles-like potentials. Although being formally simple, these couplings allow for Q-balls. In one spatial dimension, analytical solutions exist, either with vanishing or nonvanishing ϕ. In three spatial ... -
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 ... -
Compte rendu de P. Galluzzi, «Galileo, Rosmini, Darwin : triumviri del cattolicesimo riformatore (1870-1918)»
Article scientifiqueCompte rendu de P. Galluzzi, «Galileo, Rosmini, Darwin : triumviri del cattolicesimo riformatore (1870-1918)», in Rivista di filosofia, vol. 113, 2022, n°3, pp. 489-495. -
Wearable Sensors Applied in Movement Analysis
30 novembre 2022, CeREF TechniqueLivre/Ouvrage ou monographieRecent advances in electronics have led to sensors whose sizes and weights are such that they can be placed on living systems without impairing their natural motion and habits. They may be worn on the body as accessories or as part of the clothing and enable personalized mobile information processing. Wearable sensors open the way for a nonintrusive and continuous monitoring of body orientation, ... -
ZN-balls: Solitons from ZN-symmetric scalar field theory
28 novembre 2022, CeREF TechniqueArticle scientifiqueWe discuss the conditions under which static, finite-energy, configurations of a complex scalar field ϕ with constant phase and spherically-symmetric norm exist in a potential of the form V(ϕ*ϕ, ϕ^N, ϕ^*N) with N ∈ N and N ≥ 2, i.e., a potential with a ZN-symmetry. Such configurations are called ZN-balls. We build explicit solutions in (3 + 1)-dimensions from a model mimicking effective field ... -
Wearable Sensors Applied in Movement Analysis
27 octobre 2022, CeREF TechniqueArticle scientifiqueEditorial de la Special Issue de Sensors, Wearable Sensors Applied in Movement Analysis. -
Compte rendu de W. R. Shea : «Ce que Galilée dit à Milton : dialogue entre le savant et le poète»
RapportStoffel (Jean-François), Compte rendu de W. R. Shea, « Ce que Galilée dit à Milton : dialogue entre le savant et le poète », in Revue des questions scientifiques, vol. 193, 2022, n°1-2, pp. 212-214. -
Machine Learning Identifies Chronic Low Back Pain Patients from an Instrumented Trunk Bending and Return Test
03 juillet 2022, CeREF TechniqueArticle scientifiqueNowadays, the better assessment of low back pain (LBP) is an important challenge, as it is the leading musculoskeletal condition worldwide in terms of years of disability. The objective of this study was to evaluate the relevance of various machine learning (ML) algorithms and Sample Entropy (SampEn), which assesses the complexity of motion variability in identifying the condition of low back pain. ... -
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 J. Reisse : «Averroès, Copernic, Bruno et Galilée : raison, croyances et pouvoirs religieux»
RapportStoffel (Jean-François), Compte rendu de J. Reisse, « Averroès, Copernic, Bruno et Galilée : raison, croyances et pouvoirs religieux », in Revue des questions scientifiques, vol. 193, 2022, n°1-2, pp. 230-232. -
ZN-balls: Existence and application to Yang-Mills plasma
02 juin 2022, CeREF TechniqueAutreConférence donnée à "Exact solutions in classical field theory: Solitons, black holes and bosons stars – Workshop en l’honneur de Yves Brihaye", UMONS, 2-3 juin 2022. https://web.umons.ac.be/pucg/event/workshop-en-lhonneur-de-yves-brihaye/ -
Many-Quark Interactions: Large-N Scaling and Contribution to Baryon Masses
31 mai 2022, CeREF TechniqueArticle scientifiqueStarting from an effective Hamiltonian modeling, of a baryon made of N identical quarks in the large-N approach of QCD, we obtain analytical formulas, allowing to estimate the contributions of multiquark interactions to the baryon mass. The cases of vanishing (mass spectrum) and nonvanishing (baryon melting) temperatures are treated. -
Comparaison de la rigidité d’un nouveau type de benne par rapport à ceux existant
04 mars 2022, CeREF TechniqueActe de conférence ou de colloqueLa chute d’une semi-remorque basculante (appelée benne par la suite) est un accident courant dans le milieu de la construction à cause de nombreux facteurs tels que la non-horizontalité du camion, un sol trop meuble ou un déséquilibre de la charge dans la benne. D’une façon générale, si le chargement d’une benne est fortement asymétrique, son déchargement engendrera le déplacement du centre de gravité ... -
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 ... -
Sample Entropy as a Tool to Assess Lumbo-Pelvic Movements in a Clinical Test for Low-Back-Pain Patients
22 mars 2022, CeREF TechniqueArticle scientifiqueLow back pain (LBP) obviously reduces the quality of life but is also the world’s leading cause of years lived with disability. Alterations in motor response and changes in movement patterns are expected in LBP patients when compared to healthy people. Such changes in dynamics may be assessed by the nonlinear analysis of kinematical time series recorded from one patient’s motion. Since sample ... -
High Specificity of Single Inertial Sensor-Supplemented Timed Up and Go Test for Assessing Fall Risk in Elderly Nursing Home Residents
17 février 2022, CeREF TechniqueArticle scientifiqueThe Timed Up and Go test (TUG) is commonly used to estimate the fall risk in the elderly. Several ways to improve the predictive accuracy of TUG (cameras, multiple sensors, other clinical tests) have already been proposed. Here, we added a single wearable inertial measurement unit (IMU) to capture the residents’ body center-of-mass kinematics in view of improving TUG’s predictive accuracy. The aim ... -
Utilisation de la réalité virtuelle dans un test clinique adaptatif de mobilité cervicale
25 février 2021, CeREF TechniqueActe de conférence ou de colloqueDifférents tests et outils cliniques existent dans le but d’évaluer les aptitudes fonctionnelles d’un patient, d’évaluer ses progrès ou même de l’entraîner. Cependant, ces outils cliniques présentent certains problèmes : Ils sont rarement adaptables aux capacités du patient car non modulaire, peu ludique pour de jeunes patients ou sur le long terme. L’objectif de la présente recherche est d’utiliser ... -
Motor strategies and adiabatic invariants: The case of rhythmic motion in parabolic flights
05 août 2021, CeREF TechniqueArticle scientifiqueThe role of gravity in human motor control is at the same time obvious and difficult to isolate. It can be assessed by performing experiments in variable gravity. We propose that adiabatic invariant theory may be used to reveal nearly conserved quantities in human voluntary rhythmic motion, an individual being seen as a complex time-dependent dynamical system with bounded motion in phase space. ... -
Telerehabilitation of musculoskeletal diseases: Who wants it?
16 octobre 2021, CeREF TechniqueAutrePrésentation donnée au congrès NOMADe-SOFMER (Lille, 16/10/21) -
Perceived Usefulness of Telerehabilitation of Musculoskeletal Disorders: A Belgium–France Pilot Study during Second Wave of COVID-19 Pandemic
22 novembre 2021, CeREF TechniqueArticle scientifiqueBackground: COVID-19 has affected the practice of physiotherapy, and telerehabilitation (TR) may be seen as an alternative model of care if it is accepted by patients and physiotherapists. This study investigates the perceived usefulness of TR and the intention to use it among physiotherapists and patients from Belgium and France concerned with musculoskeletal disorders (MSDs) during the pandemic ...
