Sciences Et Techniques
https://luck.synhera.be/handle/123456789/112
2024-03-27T09:48:52ZDiffusion in Phase Space as a Tool to Assess Variability of Vertical Centre-of-Mass Motion during Long-Range Walking
https://luck.synhera.be/handle/123456789/1761
Diffusion in Phase Space as a Tool to Assess Variability of Vertical Centre-of-Mass Motion during Long-Range Walking
Boulanger, Nicolas; BUISSERET, Fabien; Dehouck, Victor; DIERICK, Frédéric; White, Olivier
When 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 vertical motion of the body’s centre-of-mass of 25 healthy participants walking for 10
min at spontaneous speed, we show that the distribution of the adiabatic invariant is compatible with
the solution of a Fokker–Planck equation with a constant diffusion coefficient. The latter distribution
appears to be a promising new tool for studying the long-range kinematic variability of walking.
2023-02-06T00:00:00ZCompte rendu de P. Galluzzi, «Galileo, Rosmini, Darwin : triumviri del cattolicesimo riformatore (1870-1918)»
https://luck.synhera.be/handle/123456789/1723
Compte rendu de P. Galluzzi, «Galileo, Rosmini, Darwin : triumviri del cattolicesimo riformatore (1870-1918)»
STOFFEL, Jean-François
Compte 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.
2022-01-01T00:00:00ZWearable Sensors Applied in Movement Analysis
https://luck.synhera.be/handle/123456789/1722
Wearable Sensors Applied in Movement Analysis
BUISSERET, Fabien; DIERICK, Frédéric; van der Perre, Liesbet
Recent 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, movements, and various physiological parameters during motor activities in real-life settings. Thus, they may become crucial tools not only for researchers, but also for clinicians, as they have the potential to improve diagnosis, better monitor disease development and thereby individualize treatment. Wearable sensors should obviously go unnoticed for the people wearing them and be intuitive in their installation. They should come with wireless connectivity and low-power consumption. Moreover, the electronics system should be self-calibrating and deliver correct information that is easy to interpret. Cross-platform interfaces that provide secure data storage and easy data analysis and visualization are needed.
This book contains a selection of research papers presenting new results addressing the above challenges.
2022-11-30T00:00:00ZZN-balls: Solitons from ZN-symmetric scalar field theory
https://luck.synhera.be/handle/123456789/1721
ZN-balls: Solitons from ZN-symmetric scalar field theory
BUISSERET, Fabien; Brihaye, Yves
We 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 theories based on the
Polyakov loop in finite-temperature SU(N) Yang-Mills theory. We find ZN-balls for N = 3, 4, 6, 8, 10, and
show that only static solutions with zero radial nodes exist for N odd, while solutions with radial nodes may
exist for N even.
2022-11-28T00:00:00Z