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Affichage de 421 à 430 sur 16552

Article dans une revue

Disk fraction among free-floating planetary-mass objects in Upper Scorpius

T. Rodrigues, H. Bouy, Sean N. Raymond, E. Martín, E. Bertin, J. Olivares, D. Barrado, N. Huélamo, M. Tamura, N. Miret Roig, P. Galli, J.-C. Cuillandre

Context. Free-floating planetary-mass objects (FFPs) have been detected through direct imaging in several young, nearby star-forming regions. The properties of circumstellar disks around these objects may provide a valuable probe into their origin but are currently limited by the small sample sizes...

Astronomy & Astrophysics - A&A, 2025, 704, pp.A170. ⟨10.1051/0004-6361/202556294⟩. ⟨hal-05760844⟩

Article dans une revue

Electrochemical Strain Measurements with Atomic Force Microscopy: Principles and Applications

Tatiana Proksch, Vincenzo Musicó, Saeed Saeed, Wan-Yu Tsai, Veronica Augustyn, Nina Balke

Mechanical cyclic voltammetry (mCV) is a recently developed characterization technique for studying local electrochemical processes operando. This method is a subset of electrochemical atomic force microscopy (EC-AFM) that investigates electrochemical processes on electrode surfaces. In many...

ACS Electrochemistry, 2025, 2 (1), pp.92-100. ⟨10.1021/acselectrochem.5c00411⟩. ⟨hal-05719178⟩

Thèse

Etude de la diode Schottky GaN à base de métaux réfractaires pour les applications spatiales à haute température et haute fréquence, Study of GaN Schottky diodes based on refractory metals for high-temperature, high-frequency space applications

Amir Al Abdallah

Les exigences croissantes en électronique haute température, motivées par des applications telles que le forage profond, l'aéronautique hypersonique ou encore l'exploration spatiale, imposent le développement de dispositifs capables de fonctionner au-delà des limites thermiques des..., The growing demand for high-temperature electronics, driven by applications such as deep-well drilling, hypersonic aerospace systems, and space exploration, requires the development of devices capable of operating beyond the thermal limits of traditional silicon-based technologies. In the context...

Physique [physics]. Université de Lille, 2025. Français. ⟨NNT : 2025ULILN029⟩. ⟨tel-05400902⟩

Article dans une revue

Thermal conductivity of suspended MBE-grown PtSe 2

Juliette Jolivet, Arkadiusz Gertych, Eva Desgué, Dominique Carisetti, Justin Rouxel, Julie Cholet, Pierre Legagneux, Mariusz Zdrojek, Henri Happy, David Brunel

Layered platinum diselenide (PtSe₂) grown by molecular beam epitaxy provides a reliable and reproducible alternative to mechanical exfoliation, making it suitable for scalable device integration. In this work, we thoroughly investigate the in-plane thermal conductivity of multilayer suspended PtSe...

2D Materials, 2025, 13 (1), pp.015015. ⟨10.1088/2053-1583/ae203a⟩. ⟨hal-05508805⟩

Thèse

Optimisation of manufacturing processes for the development of power transistors using GaN technology, Optimisation des procédés de fabrication pour le développement de transistors de puissance en GaN

Adrien Bidaud

This thesis investigates the design and optimization of gallium nitride (GaN) power transistors, focusing on lateral high-electron-mobility transistors (HEMTs) and vertical trench MOSFETs (V-T-MOSFETs). The objective is to achieve robust and reliable operation in the 600-1200 V class while..., Cette thèse porte sur la conception et l'optimisation de transistors de puissance en nitrure de gallium (GaN), en se concentrant sur les transistors à haute mobilité électronique latéraux (HEMTs) et les transistors MOSFETs verticaux à tranchée (V-T-MOSFETs). L'objectif est d'assurer...

Physics [physics]. Université de Lille, 2025. English. ⟨NNT : 2025ULILN035⟩. ⟨tel-05400874⟩

Communication dans un congrès

Decentralized Sybil Attack Mitigation Using Bayesian-Stackelberg Games in V2X Networks

Ahmed Didouh, Mohamed Amine BOUZAIDI TIALI, Marwane Ayaida, Yassin El Hillali, Atika Rivenq

This paper proposes a novel blockchain-based framework for securing vehicular networks against Sybil attacks while maintaining scalability, decentralization, and privacy. The system leverages dynamic Proof of Location (PoL) in a game-theoretic setting, where vehicles self-organize into groups and...

GLOBECOM 2025 - 2025 IEEE Global Communications Conference, Dec 2025, Taipei, Taiwan. pp.787-792, ⟨10.1109/GLOBECOM59602.2025.11432460⟩. ⟨hal-05669587⟩

Communication dans un congrès

Enhancing SSI-ZKP Protocols with Galois element and Homomorphic function for VANETs

Mohameden Dieye, Marwane Ayaida, Yassin El Hillali

In the context of Vehicular Ad hoc Networks (VANETs), ensuring fast, secure, and privacy-preserving identity verification is a growing challenge due to the dynamic and distributed nature of such environments for VANETs. This paper proposes a novel enhancement to Self-Sovereign Identity (SSI)...

GLOBECOM 2025 - 2025 IEEE Global Communications Conference, Dec 2025, Taipei, Taiwan. pp.781-786, ⟨10.1109/GLOBECOM59602.2025.11431888⟩. ⟨hal-05669597⟩

Communication dans un congrès

A Deep Graph Learning Framework for Detecting False Data Injection Attacks in VANETs

Abdelmonom Hajjej, Sameh Najeh, Nadhir Messai, Leila Najjar, Marwane Ayaida

False emergency messages, a critical variant of False Data Injection Attacks (FDIAs) in Vehicular Ad Hoc Networks (VANETs), pose severe threats to traffic safety and undermine the reliability of intelligent transportation systems. Existing detection approaches often rely on macroscopic traffic...

GLOBECOM 2025 - 2025 IEEE Global Communications Conference, Dec 2025, Taipei, Taiwan. pp.3176-3181, ⟨10.1109/GLOBECOM59602.2025.11431743⟩. ⟨hal-05620310⟩

Article dans une revue

Tuning the optoelectronic properties and nanostructure of silicon photoelectrodes for enhancing solar fuel production

Simon Joyson Galbao, Dhruv Aggarwal, Bruno Grandidier, Dharmapura H K Murthy

Due to its broadband optical absorption and advancement in wafer-based processing technology, silicon is extensively employed in photovoltaic devices. However, the application of silicon for photoelectrochemical reactions in its wafer/bulk form is limited and has consistently demonstrated...

Communications Materials, 2025, 7, ⟨10.1038/s43246-025-01023-7⟩. ⟨hal-05474526⟩

Thèse

Bioinspired ultra-low power architectures for sound source localization and recognition, Architectures bioinspirées ultra-faible consommation pour la localisation et la reconnaissance de sources sonores

Eugénie Dalmas

Biomimetism is an increasingly widespread approach in various scientific fields. It regularly gives rise to new paradigms and, in recent years, has driven neuromorphic computing and technologies which promise significant advances in the field of information theory and unprecedented energy..., Le biomimétisme est une approche de plus en plus répandue dans les différents domaines scientifiques. Il est régulièrement la source de nouveaux paradigmes et, depuis quelques années, a impulsé le traitement et les technologies neuromorphiques qui portent la promesse d'avancées significatives...

Physics [physics]. Université de Lille, 2025. English. ⟨NNT : 2025ULILN026⟩. ⟨tel-05382138⟩