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Séminaire
On June 26, 2026
Romane FREY - (PhD, MOVE) || Mathieu LETROU- (Post-Doc, MC2)
What do a fish and a diabolo have in common?
Romane FREY- (PhD, MOVE)
The rapid launch of a diabolo into the air when both ends of its string are suddenly pulled illustrates a simple but effective mechanical process. This motion can be interpreted using a simple geometric model in which a folded triangular configuration of a string is quickly straightened under fast traction at its extremities, transferring momentum to the central object. The same principle applies to a folded elastic membrane. As the ends are pulled apart, the mass distributed along the membrane is rapidly accelerated, similarly to how a diabolo is launched. Because unlike in the diabolo, the mass is not free, the sudden transfer of momentum makes the membrane vibrate. The frequency of the sound produced depends on the tension in the membrane. This analogy suggests potential relevance in bioacoustics, where certain fish species may use similar rapid tensioning mechanism to produce loud sounds. In bony fish, sound production relies on the contraction of high-speed muscles that rapidly modulate the tension of a gas-filled organ, the swim bladder.
Optimising your survival rate in AI-Driven cars.

Mathieu LETROU - (Post-Doc, MC2)
As autonomous vehicles become smarter, an ethical question emerges: what happens when your car must decide who lives and who dies? In this talk, we will explore the scientific research devoted to this problem. Through ethics, sociology, economics, and mathematics point of view, we will examine the different solutions proposed by researchers and the challenges they raise for society. By the end, you will have all the tools needed to maximize your chances of survival in a world where driving licenses have become obsolete.
Date
11:00
Localisation
LIPhy, salle de conférence
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