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Description of void coalescence by internal necking/shearing within XFEM via a micromechanical 3D volumetric cohesive zone model (μ-VCZM)
No full textInternational audienc
Programmable metasurfaces for future photonic artificial intelligence
No full textInternational audiencePhotonic neural networks (PNNs), which share the inherent benefits of photonic systems, such as high parallelism and low power consumption, could challenge traditional digital neural networks in terms of energy efficiency, latency and throughput. However, producing scalable photonic artificial intelligence (AI) solutions remains challenging. To make photonic AI models viable, the scalability problem needs to be solved. Large optical AI models implemented on PNNs are only commercially feasible if the advantages of optical computation outweigh the cost of their input-output overhead. In this Perspective, we discuss how field-programmable metasurface technology may become a key hardware ingredient in achieving scalable photonic AI accelerators and how it can compete with current digital electronic technologies. Programmability or reconfigurability is a pivotal component for PNN hardware, enabling in situ training and accommodating non-stationary use cases that require fine-tuning or transfer learning. Co-integration with electronics, 3D stacking and large-scale manufacturing of metasurfaces would significantly improve PNN scalability and functionalities. Programmable metasurfaces could address some of the current challenges that PNNs face and enable next-generation photonic AI technology
Disjunctive Scheduling in Tempo
No full textInternational audienceIn this paper we introduce a constraint programming lazy clause and literal generation solver embarking ideas from SAT Modulo theories. A key aspect of the solver are Boolean variables with an associated semantic in difference logic, i.e., systems of binary numeric difference constraints or edges, making it particularly adapted to scheduling and other temporal problems. We apply this solver to disjunctive scheduling problems, where edges are used as branching variables, can be inferred via the edge finding rule as well as by transitivity reasoning, and can in turn strengthen propagation via temporal graph reasoning. Our experiments on job-shop scheduling show that a deep integration of these techniques makes our solver competitive with state-of-the-art approaches on these problems
De la lumière au noir, à travers la BD et l'œuvre de Soulages - Agrocampus RODEZ
No full textIntervention devant une classe de seconde menant un projet sur l'œuvre de Pierre Soulages. Lycée de La Roque - Agrocampus de RODE
Gaussian-basis-set approach to one-loop self-energy
No full textInternational audienceWe report a method for the evaluation of the one-loop self-energy, to all orders in the external binding field, using a Gaussian-basis-set expansion. This choice of basis is motivated by its widespread use in molecular calculations. For a one-electron atom, our results show excellent agreement with those obtained using the exact Dirac-Coulomb wave functions. The developed method can be of interest for high-precision studies of heavy few-electron molecular systems, where the rigorous computation of QED corrections is currently a formidable task
Static vs. Dynamic Characterization of p-GaN HEMTs: Discrepancies in Electrical Characteristics and their Dependence on Bias History
No full textThis paper was presented at the EPE 2025 conference and was subsequently selected for publication in the special issue of Elsevier's PEDC journal. Therefore, only the abstract appears on the conference website.International audienceQuasi-static electrical characteristics of p-GaN HEMTs fluctuate with bias history. This study evidences that dynamic operation is fortunately highly reproducible without pre-conditioning. The original experimental setup highlights that quasi-static data alone is insufficient for modeling dynamic behavior, while allowing precise detection of discrepancies, enabling improved transient modeling
Effet de la vitesse de déformation et de la triaxialité sur l'endommagement dynamique des métaux
No full textInternational audienc
Evaluating new meat/mushroom mixtures for the mitigation of process-induced toxicants and for environmental co-benefits
No full textInternational audienceSeveral studies suggest the involvement of toxic food-born contaminants in various human pathologies. Meat products are particularly concerned by the generation of process-induced toxicants (PITs) with mutagenic and carcinogenic properties which are now more than ever targeted by health safety agencies. Along with these public health considerations, FAO projections for 2030 predict an increase in protein demand of around 40%, which cannot be covered only by animal protein. Scientists therefore agree that it is necessary to increase the proportion of plant proteins in our diets, but many obstacles remain before we get there. In this context, the MixMeat project aims to show that it is possible to formulate new types of mixed foods guaranteeing a low rate of PITs generated during cooking while maintaining a good essential porteins and nutrients intake.To do this, the project takes advantage of both the antioxidant and nutritional properties of button mushrooms to offer an innovative mixed food that is healthier and in line with the need for food transition. The aim of the project is to develop a new mitigation method for PITs and to investigate the mitigation mechanisms involved, as well as the environmental impact that would result from formulating such a food.In this presentation, the results showing the influence of mushroom incorporation on PIT mitigation (i.e. heterocyclic aromatic amines and polycyclic aromatic hydrocarbons) will be exposed, as well as the results of life cycle analysis of this new mixed food compared to ground beef patties
Interest of a segregated finite element solver for mechanical multi-physics coupling in geo-materials
No full textInternational audienceMany civil engineering problems lead to coupled multi-physics formulations: among them are the classical poro-mechanical and non-local problems, and more recently the multiple chemical-mechanical coupling problems (Alkali-aggregate reactions, delayed ettringite reaction, decalcification, etc.). Each new phenomenon to be considered leads finite element code developers to question the best strategy to adopt to solve these increasingly complex mechanical-multiphysics problems. There is always a choice between a strongly coupled implementation of all the equations, requiring significant development time, or a segregation of the physics requiring less implementation time but more computation time to ensure compatibility of the equations via an iterative algorithm. The aim of our work is to propose criteria for choosing between these two strategies. The article recalls the algorithms of the methods and provides an illustration allowing its effectiveness to be verified through a comparison between the solution of a classic linear poromechanics problem obtained by a fully coupled method and the solution of this same problem obtained by a segregated algorithm. The interest of this classical example lies in the fact that the fully coupled formulation of the problem is linear, whereas it is non-linear in a segregated context. This case study permits to have an exact reference numerical solution of the coupled problem, and simultaneously a main problem with a non-linear segregated sub-problem to test the segregated algorithm numerically. The article concludes with a discussion of the drawbacks and advantages of the segregated method, both in terms of implementation time and computation time
A Luminescent Stable Triarylmethyl Diradical with an Axially Chiral Spacer
No full textInternational audienceTwo units of a highly stable luminescent triarylmethyl radical (PyBTM) were bridged using a chiral octahydrobinaphthyl moiety, resulting in a diradical with sufficient stability to enable the measurement of its chiroptical properties. To synthesize this diradical, a novel boronic ester radical precursor, αH‐PyBTM‐B(Epin), was designed. The use of this precursor significantly improved the yield and streamlined the preparation of stable luminescent radical‐substituted molecules. The photoluminescence quantum yield (PLQY) of the diradical was measured to be 10 % in chloroform. Furthermore, both circular dichroism (CD) and circularly polarized luminescence (CPL) were successfully observed