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Cyclic N, O-acetals and corresponding opened N, N-aminals as new scaffolds with promising anti-inflammatory and antifungal activities against Candida albicans
No full textInternational audienc
Étude par microscopies à sondes locales de surfaces GaN gravées à l'argon pour la réalisation de diodes Schottky
No full textInternational audienc
De l’émotionème à l’énonciation marionnettiste : une analyse discursive systémique des mèmes
No full textInternational audienceBy proposing a semio-discursive analysis of the use of memes on the Internet, this article explores their plurisemiotic nature, combining textual and visual elements to convey messages and emotions. Thus, memes are not limited to humor but also serve as powerful tools for the circulation of emotions and ideas in both digital and non-digital contexts, from a post-digital perspective. Consequently, memes are analyzed as hypernarrative objects that transcend discursive genres and stimulate user engagement on Web 2.0. To capture their particularities, we also introduce the concept of 'puppeteer enunciation,' where the enunciator uses a character or narrative scenario to express a message and convey social representations
Bottom gated in-plane selective area grown InSb nanowires on GaAs(111)B
No full textInternational audienc
Incorporating Human-In-The-Loop interactivity through the integration of discrete event simulation and virtual reality
No full textInternational audienceThis paper introduces a groundbreaking framework that integrates Human-in-the-Loop capabilities into Discrete Event Simulation systems (DES), in combination with Virtual Reality (VR). This innovation represents a significant departure from traditional DES systems by enabling real-time human participation, thus enhancing adaptability, decision-making, and engagement within the simulation process. Leveraging the strengths of DES and VR, the proposed framework employs the High-Level Architecture to overcome interoperability challenges, ensuring efficient communication and synchronization between DES and VR components. Key contributions of this work include enhanced flexibility through task decomposition, improved system maintainability via a dynamic architecture that enhances accessibility for non-expert users, and an immersive, interactive user experience. By integrating humans directly into DES, this framework redefines simulation systems, opening new possibilities for interactive, human-driven applications across domains such as healthcare, logistics, and manufacturing. Our findings highlight the transformative potential of Human-in-the-Loop integration, offering a novel paradigm for smarter, more adaptive simulation environments.</div
« Au-delà de Vauban et de Louis XIV : la citadelle de Lille depuis le XVIIIe siècle »
No full textInternational audienceLa citadelle de Lille, bâtie après la conquête de Lille en 1667, est un monument emblématique de la Capitale des Flandres considéré comme l’un des chefs-d’œuvre du marquis de Vauban. Pourtant, ce site militaire est en lui-même peu connu des Lillois et la littérature scientifique au-delà du règne de Louis XIV est quasiment inexistante. Cette conférence a pour objectif de présenter l’histoire de cet édifice depuis le XVIIIe siècle, tant sur ses aspects militaires que ses relations avec Lille et ses habitants
La désobéissance civile, nouvelle forme d'alerte précoce en santé environnementale
No full textInternational audienceCompte tenu de l'inconsidération de l'alerte en santé environnementale et de l'inertie des pouvoirs publics en la matière, son intervention consiste à observer la désobéissance civile comme une nouvelle forme d'alerte empirique qui vise moins à signaler les risques sanitaires auxquels nous sommes confrontés que de résister contre un système qui ne permet pas de les endiguer et de nous protéger
Efficient parametric estimation of the spatial autoregressive model
No full textThis paper introduces a new one-step parametric estimation method for spatial autoregressive (SAR) models, providing an efficient estimator for any error distribution with a defined quantile function. Based on Le Cam's Local Asymptotic Normality (LAN) theory, it extends the maximum likelihood approach to cases like the Laplace distribution, which lacks a globally defined first derivative.\We further develop this estimator for two highly flexible distributions: Tukey's gand-h and Pewsey and Jones's sinh-arcsinh (SAS), designed to capture skewness and non-normal tail weight. These flexible distributions mitigate the risks of distributional misspecification by approximating a wide range of parametric distributions. Monte Carlo simulations assess finite-sample performance, showing that our estimator outperforms traditional parametric spatial methods when the error distribution deviates from normality and is well-approximated by these flexible alternatives
Modeling of Surface-Emitting Terahertz Quantum Cascade Laser Based on Difference Frequency Generation
No full textInternational audienceIn this paper, we propose a simple method to calculate the THz field and THz power generated via intracavity difference frequency generation in a dual-wavelength mid-infrared quantum cascade laser. The approach is based on using a surface emission scheme in the nonlinear waveguide. The results show that the THz output power varies linearly with the product of the tow mid-infrared pump powers, and strongly depends on the cover refractive index for the THz waves. Specifically, a higher refractive index leads to a significant increase in THz power, while a low product of the pump powers levels result in weak output power. Additionally, the effect of nonlinear film thickness on optical efficiency is considered. The efficiency decreases as the film thickness increases. This is due to the dependence of the THz field amplitude in the cover region on the film-substrate and film-cover interfaces, which is significantly affected by the film thickness. Our model generates output power through surface emission, in agreement with existing experimental results, highlighting the importance of optimizing the cover material and film thickness to improve output power and THz efficiency
On the importance of Ni-Au-Ga interdiffusion in the formation of a Ni-Au / p-GaN ohmic contact
No full textInternational audienceThe Ni-Au-Ga interdiffusion mechanisms taking place during rapid thermal annealing (RTA) under oxygen atmosphere of a Ni-Au/p-GaN contact are investigated by high-resolution transmission electron microscopy (HR-TEM) coupled to energy dispersive X-ray spectroscopy (EDX). It is shown that oxygen-assisted, Ni diffusion to the top surface of the metallic contact through the formation of a nickel oxide (NiOx) is accompanied by Au diffusion down to the GaN surface, and by Ga out-diffusion through the GaN/metal interface. Electrical characterizations of the contact by Transmission Line Method (TLM) show that an ohmic contact is obtained as soon as a thin, Au-Ga interfacial layer is formed, even after complete diffusion of Ni or NiOx to the top surface of the contact. Our results clarify that the presence of Ni or NiOx at the interface is not the main origin of the ohmic-like behavior in such contacts. Auto-cleaning of the interface during the interdiffusion process may play a role, but TEM-EDX analysis evidences that the creation of Ga vacancies associated to the formation of a Ga-Au interfacial layer is crucial for reducing the Schottky barrier height, and maximizing the amount of current flowing through the contact