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DTSTART;TZID=Europe/Paris:20260914T110000
DTEND;TZID=Europe/Paris:20260914T120000
DTSTAMP:20260910T140135Z
CREATED:20260910T140135Z
LAST-MODIFIED:20260910T140135Z
UID:10000241-1789383600-1789387200@sfp-alpes.fr
SUMMARY:Daniel DUFFY (Cambridge\, UK)
DESCRIPTION:Mechanics and geometry of nematic shape-morphing sheets\n\nRésumé : \nThin ‘shape-programmed’ sheets morph into curved shapes when stimulated by heat\, light\, or chemical fuel. Biology is full of intricate examples (leaves\, petals\, etc)\, and soft synthetic materials such as liquid-crystal elastomers have begun to approach similar levels of richness\, opening doors to bio-inspired soft machines. Such machines can lift\, pump\, push\, pull\, . . . etc\, promising myriad applications including microfluidic components\, deployable structures\, switchable surfaces\, and robotic actuators. I’ll present work on nematic shape morphers\, in which the direction of anisotropic deformation is patterned\, while deformation magnitudes are spatially uniform. The focus will be on encoding Gauss curvature\, which imparts mechanical strength to the resultant structures\, as Gauss understood centuries ago. The patterned deformation direction must typically be chosen at the time of manufacture\, leading to a design limitation: the morphing sheet can only realise a single target shape. I will then show how to overcome this limitation\, by varying the deformation magnitude (e.g. via patterned illumination) in both space and time. This new paradigm allows a single physical sample to be morphed into arbitrarily many different shapes at will. Thus a designer can specify entire time-dependent motions of the sheet. This capability could greatly increase the versatility of soft robots\, e.g. when operating in confined environments or performing complex tasks. Furthermore\, it facilitates swimming\, which typically requires non-reciprocal motion. More generally\, it unlocks the full potential of shape-morphing sheets\, allowing them to progress from being merely functional to being truly multi-functional. \n_ \nContact : emmanuel.siefert@univ-grenoble-alpes.fr
URL:https://sfp-alpes.fr/event/daniel-duffy-cambridge-uk/
LOCATION:LiPhy – Salle de conférence\, LiPhy 140 avenue de la Physique\, St Martin d'Hères\, 38402\, France
CATEGORIES:Séminaire
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DTSTART;TZID=Europe/Paris:20260914T140000
DTEND;TZID=Europe/Paris:20260914T150000
DTSTAMP:20260903T152520Z
CREATED:20260903T152520Z
LAST-MODIFIED:20260903T152520Z
UID:10000237-1789394400-1789398000@sfp-alpes.fr
SUMMARY:Gabriel GARCIA JIMENEZ  (Institut Laue-Langevin)
DESCRIPTION:Proton-induced reactions on 238U in inverse kinematics : probing fission through nucleon knockout\nRésumé : \nIn this seminar\, I will present a study of proton-induced reactions on 238U in inverse kinematics\, performed at 540 AMeV with the R3B/SOFIA setup at GSI. The experiment provides access to the different reaction channels and\, in particular\, to the fission of the protactinium residue following nucleon knockout. \nI will discuss how the excitation energy of the residual nucleus was reconstructed from the kinematics of the emitted nucleons and how it can be correlated with the charge distribution of the fission fragments. This provides a way to investigate the evolution of shell effects with excitation energy and to test different theoretical descriptions of this process. The experimental results will be compared with calculations based on the INCL and ABLA07 models. \nFinally\, I will show the measured cross sections for the main spallation-evaporation and spallation-fission channels and compare them with previous experimental data and theoretical predictions. Overall\, the results provide insight into the interplay between nucleon knockout\, nuclear excitation\, and fission in relativistic proton-induced reactions on heavy nuclei. \nHenry Fischer (College 3 Secretary) \nExternal visitors may ask for a site access to : dubouloz@ill.fr \nZoom link : https://ill.zoom.us/j/7804743065?pwd=vYbib10VNk56W5mHOHB2QhzTBEyT0J.1&omn=95143035964 – Password : SeminarC3 \n 
URL:https://sfp-alpes.fr/event/gabriel-garcia-jimenez-institut-laue-langevin/
LOCATION:ILL – Salle de Séminaire (110-111)\, ILL 50 71 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Séminaire
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DTSTART;TZID=Europe/Paris:20260914T140000
DTEND;TZID=Europe/Paris:20260914T150000
DTSTAMP:20260910T141150Z
CREATED:20260910T141150Z
LAST-MODIFIED:20260910T141150Z
UID:10000242-1789394400-1789398000@sfp-alpes.fr
SUMMARY:Alberto CARTA ( Laboratory for Material simulations\, Paul Scherrer Institut\, Villigen)
DESCRIPTION:Of bandits and Bohr magnetons : balancing exploration and exploitation in magnetic landscapes\nRésumé : \nThe energy landscape of strongly interacting magnetic materials is a high-dimensional\, rugged terrain populated by a multitude of metastable states with distinct magnetizations\, oxidation states\, and orbital orders. Identifying the true ground state within this complexity remains a significant hurdle for the computational design of materials with tunable magnetic properties.\nBuilding on the work of Ponet et al. [1\,2]\, we systematically characterize this terrain to reveal the fundamental drivers of its complexity. We trace its origins to a core competition between the DFT functional’s preference for delocalization and the Hubbard +U correction’s drive for localization. This primary conflict is further modulated by a hierarchy of magnetic interactions\, including Hund’s coupling\, superexchange\, and Kugel-Khomskii physics\, which collectively define the energetic valleys and barriers across both high and low energy scales.\nTo overcome these barriers\, we propose a novel approach inspired by a completely different field: advertisement/recommendation engines (contextual Bandits) currently powering social media feeds and large parts of the Internet. By leveraging bandit strategies that balance the exploration of unknown configurations with the exploitation of known areas\, we demonstrate an efficient method for navigating this landscape. Our results show that these strategies successfully identify the lowest energy states where traditional methods often fail\, providing a robust framework for predicting and engineering the properties of strongly correlated magnetic materials. \n[1] Ponet\, L.\, Di Lucente\, E.\, & Marzari\, N. (2024). The energy landscape of magnetic materials. npj Computational Materials\, 10(1)\, 151.\n[2] Haddadi\, F.\, Campi\, D.\, dos Santos\, F.\, Mounet\, N.\, Ponet\, L.\, Marzari\, N.\, & Gibertini\, M. (2025). Exploring the magnetic landscape of easily-exfoliable two-dimensional materials (arXiv:2509.09531v2). \n_ \nContact : matteo.dastuto@neel.cnrs.fr
URL:https://sfp-alpes.fr/event/alberto-carta-laboratory-for-material-simulations-paul-scherrer-institut-villigen/
LOCATION:CNRS – Salle Louis Weil (E424)\, CNRS - Institut Néel 25 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Séminaire
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