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Production scientifique
(3) Presentation(s) - Année 2025
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Lun. 20/01/2025 14:00 autre Soutenance de HDR
CASANELLAS VILAGELIU Laura (L2C)
Soft matter under flow: from model fluids to biomimetic tissues (Bat. 20)
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Mer. 22/01/2025 10:00 autre Séminaire
GRANER Francois (Matière et Systèmes Complexes CNRS & Université Paris-Cité)
Collective migration of epithelial cells : from animal to lab, and back (Bat.20)
Sommaire:
The fruit fly larva is a maggot which looks like a dull white
cylinder. Within a few days, and without any changes in its genome
sequence, it metamorphoses. It gets its sophisticated adult fly shape
with wings, legs, antennas, and compound eyes. How do cells migrate,
deform, and rearrange to shape a tissue ?
To approach step by step the dynamics of this morphogenesis, we will
journey from developmental biology to mechanics, from discrete
description of cellular material to continuum mechanics
quantification, and from experiments to modeling. We will investigate
flows within geometries specifically designed to discriminate between
models. Pour plus d'informations, merci de contacter Casanellas vilageliu L.
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Mer. 29/01/2025 09:45 autre Colloquium
FARDIN Marc-Antoine (Institut Jacques Monod, Université Paris Diderot)
Amphi Bâtiment 20
Radical scaling: beyond our feet and fingers
Sommaire:
The most common numeral system is decimal, based on our ten fingers, but countless other systems exist and have been used throughout history. They use a different "base" or "radix". Traces of these alternative systems are still present today: when we buy a dozen eggs, use base 24 and 60 for timekeeping, or hear a French speaker say ``four-twenty four'' to mean eighty-four, a vestige of a vigesimal (base-20) system. We use our fingers to count in the same way that we may use our feet to measure lengths. We rely on these anthropocentric standards to communicate, but we expect natural phenomena to be independent of the language we speak, the metrics we choose, and even the kind of numbers we use. Both numbers and units should be informed by nature, not human conventions. To illustrate this radical idea, I will explore examples from the capillary dynamics of droplets and bubbles, and from explosions—two classical subjects of scaling. Starting with a single power law, I will show that its eventual breakdown is actually a necessity if the associated phenomenon is to be independent of our human imprint. No power law can extend indefinitely. Pour plus d'informations, merci de contacter Poy G.
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