Mercredi 17 avril 2024
Salle de conférences IRMA
The Irmia++ "Young Researchers" budget management committee is organising a cohesion day for PhD students and post-doctoral researchers from Irma, ICube and ObAs.
The event will take place on Wednesday 17 April.
The afternoon will be devoted to a series of six short, accessible talks given by young researchers from these three laboratories.
Venue : Salle de conférences IRMA
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Mercredi 17 avril 2024
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14:40
Luc Vedrenne, ICube
Point Cloud Latent Registration
The joint rigid registration of multiple highly degraded point clouds can be transposed within the latent space of a pretrained autoencoder. This simple approach yields new state-of-the-art performances in challenging scenarios. -
15:00
Thomas Saigre, Irma
A coupled fluid-dynamics-heat transfer model for 3D simulations of the aqueous humour flow in human eye
Understanding human eye behavior involves intricate interactions between physical phenomena such as heat transfer and fluid dynamics. Aqueous humor dynamics regulates intraocular pressure, crucial for understanding conditions like glaucoma. Accurate computational models are vital for comprehending ocular diseases and therapeutic interventions. In this presentation, I will focus on modeling and simulating aqueous humor flow in the anterior and posterior chambers of the eye, coupled with overall heat transfer, and present some numerical results. -
15:20
Yassin Khalil, ObAS
Can we decipher the dynamics of the Milky Way spiral arms from Gaia ?
The unprecedented data from the Gaia mission has allowed us to reveal in detail the non-axisymmetric velocity field of the Milky Way disk. However, devising a precise model of the underlying non-axisymmetric components is far from trivial. In this talk, I will show how we explored the vast parameter space of the bar models and spiral arm models in order to establish the current most realistic dynamical non-axisymmetric model for the Milky Way Disk. -
15:40
Renzo Meyer, ICube
Elaboration, characterization and functionalization of thin graphitic layers used in the synthesis of carbon transparent electrodes with equivalent properties to Indium Tin Oxide
In the forthcoming future, it will be necessary to find viable alternatives to commonly used Transparent Conductive Oxide (TCO) and particularly indium based materials like Indium Tin Oxide (ITO). Transparent electrodes are widely used in optoelectronic devices such as touch screens, photovoltaic cells, organic light emitting diodes and more. In our work, transparent conductive electrodes are produced by a two steps laser process based on pure carbon. In first, we deposit thin layers of Diamond-Like Carbon (DLC) by the Pulsed Laser Deposition technique (PLD) on various insulating substrates. In a second time, the DLC surface is graphitized by a deep UV laser annealing treatment. While DLC presents a high opacity in the UV range, Thin Graphitic Layers (TGL) are therefore formed sat the very first atomic surface layers (typically 2 nm). The insulating property and the high transparency in the visible range of the DLC combined to the high electrical conductivity of the TGL at its surface produces transparent electrodes presenting similar or even better properties than ITO. We are also studying the integration of Organic Light-Emitting Diodes (OLED) and Field Effect Transistors (FET) showing the potential of this original technology. -
16:00
Victoria Callet, Irma
Topology and applications to music analysis
The aim of this presentation is to understand how to topologically model a musical score in order to elucidate its structure, and more specifically to recognise the musical style of a given piece. -
16:20
Mei Palanque, ObAS
New radiative transfer methods in numerical simulations of galaxy formation: application to the scale of reionization
The epoch of reionization takes place starting 150 Myrs after the big bang, and ends approximately around 1 Gy after the big bang (redshift 20 to 6). During this period of our universe's history, its entire gas contente becomes ionized by the recently formed galaxies and stars. However, details about how this reionization took place are still debated, and observation missions for this period, such as SKA, are still a long way from now. Nowadays, the best way to study the reionization epoch and to prepare for future observations is cosmologic simulations. Most of them currently use the same model for radiative transfer, the moment model M1, which has an analytic closure allowing it to be easy to compute. However, this model comes with approximations that could change the output of the simulations and alter our understanding of the epoch of reionization; for exemple, as M1 approximates photons as a fluid, two colliding fronts of photon waves tend to create pseudo sources that should not exist. My thesis mainly aims at trying at competing models of radiative transfer, mainly the Pn model, already in use in many other fields of physics, to see if it could be a replacement or a complementary model to M1. We can observe quite easily that it doesn't have the issue of the pseudo sources in colliding front, however it cannot guarantee the positivity of the energy, and reacts quite badly to impulse sources, while being more computationnaly expensive than M1. Trying to make it work with the same chemistry module than used with M1 will tell us if Pn can still be worked with despite those apparent flaws.