Portail HAL de l'Université du Littoral Côte d'Opale
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The role of Cu/Mn ratio in mixed oxides for total oxidation of air pollutants
No full textInternational audienc
Economie circulaire et intelligence artificielle : foisonnement d’innovations ?
No full textBlog Alternatives ÉconomiquesDepuis les travaux fondateurs de Joseph Schumpeter sur l’innovation, considérée comme étant une activité linéaire portée par un entrepreneur isolé, le concept d’innovation a considérablement évolué pour intégrer la dimension systémique des mécanismes à l’œuvre (Adatto et al., 2023). L’innovation systémique, bien qu’elle n’ait pas fait l’objet d’un consensus en ce qui concerne sa définition dans la littérature, se conçoit comme un concept qui englobe les multiples perspectives de l’innovation au sein d’un système complexe
Syndication et rentabilité des entreprises financées par equity crowdfunding
No full textInternational audienceBy drawing on arguments from agency theory and resource dependence theory, our article examines the impact of syndication on the post-investment profitability of French companies financed through equity crowdfunding (ECF) during the period 2011–2022. Using two econometric approaches suited to the longitudinal nature of our data, our results reveal a negative association between these two variables. While syndication provides financial and cognitive resources to the company, it can also lead to conflicts of interest and coordination issues that may hinder project success and financial performance.En mobilisant des arguments issus des théories de l’agence et de la dépendance aux ressources, cet article étudie l’impact de la syndication sur la rentabilité post-investissement des entreprises françaises financées par equity crowdfunding (ECF) au cours de la période 2011-2022. En s’appuyant sur deux approches économétriques adaptées à la nature longitudinale de leurs données, les résultats révèlent l’existence d’une association négative entre ces deux variables. Si la syndication procure des ressources financières et cognitives à l’entreprise, elle peut conduire à des divergences d’intérêt et à des problèmes de coordination pouvant altérer la réussite du projet et sa performance financière
Rational screening of deep eutectic solvents for the removal of halogenated volatile organic compounds
No full textInternational audienceAbstract A novel screening method integrating theoretical calculations with experimental validation was proposed to select deep eutectic solvents (DESs) for the highly efficient removal of halogenated volatile organic compounds (HVOCs) from exhaust gas. 1,2‐Dichloroethane and dibromomethane were used to evaluate the reliability of this screening method. Following a meticulous screening process, tetraethylammonium chloride (TEAC) and levulinic acid (Lev) were identified as the hydrogen bond acceptor and donor, respectively, for the preparation of the DES TEAC–Lev (1:2). The TEAC–Lev (1:2) exhibited favorable viscosity and thermal stability, ensuring its outstanding recyclability over multiple absorption–desorption cycles. The absorption ratios of 1,2‐dichloroethane and dibromomethane using the prepared DESs were both greater than 98.5%. The microscopic absorption mechanism indicates that the excellent absorption performance of TEAC–Lev (1:2) is mainly attributed to hydrogen bond interactions between the chlorine atoms and HVOCs, as well as between Lev and HVOCs
Fraude au virement : pas de remboursement en dehors des prévisions du Code monétaire et financier: commentaire de Cass. com., 15 janv. 2025, n° 23-13.579, FS-B : JurisData n° 2025-000199 et Cass. com., 15 janv. 2025, n° 23-15.437, FS-B : JurisData n° 2025-000200
No full textInternational audienceLa Cour de cassation confirme que le régime de responsabilité des articles L. 133-18 et suivants du Code monétaire et financier est un régime exclusif, de sorte qu’il est le seul applicable lorsque la responsabilité d’un prestataire de service de paiement est recherchée en raison d’une opération non autorisée ou mal exécutée
Meta-learning of Univariate Estimation-of-Distribution Algorithms for Pseudo-Boolean Problems
No full textInternational audienceWe propose a new framework for univariate Estimation-of-Distribution Algorithms (EDAs) in which neural networks are used at two levels: (i) for generating new solutions from a memory that encodes some information acquired since the beginning of the search, (ii) for updating this memory with the new solutions sampled at each iteration. These neural networks are then learned by neuro-evolution, so as to automatically discover new efficient strategies for solving pseudo-Boolean problems, without having any specific a priori on how to design them. The algorithms discovered demonstrate their competitiveness compared with existing univariate EDAs of the literature. On average, they achieve better scores for the same number of calls to the objective function, when tested on a variety of different distributions
Geomorphic consequences of freshwater discharge and microbial mats in a macrotidal environment: The case of the beach of Dannes (northern France)
No full textInternational audienceAbstract This study focuses on the geomorphic consequences of possible microbial mats associated with freshwater discharge on the macrotidal sandy beach of Dannes (northern France). The aim was to explain the lack of foredune at Dannes, in contrast to nearby beaches, despite similar sand resources and meteorological‐marine conditions. A transdisciplinary research was carried out, involving microbiology, geomorphology and sedimentology. In addition to topographic, hydrographic and sedimentological analyses related to the tidal cycle and storm occurrence, SEM analysis of the microtextures of quartz grains collected from the beach surface provided data on the marine and aeolian forces in the coastal system, as well as on the biological processes active in the sediment. The microbial composition of the beach surface sediment was identified using the metabarcoding approach with DNA extracted from samples collected in the field. The study highlights the presence of a millimetre layer of coloured sand that is strictly associated with freshwater outflows fed by groundwater from the Cretaceous Chalk aquifer. Several facts converge to identify this layer as a microbial mat where the aggregation of grains by bio‐mineralogical mechanisms stabilizes the beach surface. Although less than 50 m wide, and located in the supratidal beach, the microbial mats, which are constantly washed by freshwater, inhibit wind transport of sand and prevent foredune formation. On the other hand, they promote the formation of a berm in relation to the run‐up of storm waves, which could be enhanced by the low roughness of the microbial mat surface. Aerial photographs since 1946 show that the berm can form in less than 20 years, but it can suddenly disappear when the wave height and run‐up exceed the threshold that triggers berm erosion. Thus, physical and biological processes that are active on the supratidal beach interact to create distinctive landforms, i.e. berms instead of foredunes
Crédit-bail : exclusion de l'ancien article L. 313-22 du Code monétaire et financier: note ss. Cass. com. 27 nov. 2024, n° 22-14.250, in « Droit bancaire – Chronique de jurisprudence »
No full textInternational audienceLe bailleur qui consent un crédit-bail n’accorde pas au preneur, qui s’acquitte de loyers, un concours financier entrant dans le champ d’application de l’ancien article L. 313-22 du Code monétaire et financier
Aval d'un billet à ordre : le doute profite au dirigeant de la société souscriptrice: note ss. Cass. com., 23 oct. 2024, no 22-22215, in « Droit bancaire – Chronique de jurisprudence »
No full textInternational audienceEn cas de doute sur la qualité en laquelle le dirigeant d’une société souscriptrice d’un billet à ordre a apposé sa signature dans la case destinée à l’aval de l’effet, une cour d’appel doit être approuvée d’avoir considéré qu’il ne s’est pas engagé personnellement en qualité d’avaliste
Potential of Bio-Sourced Oligogalacturonides in Crop Protection
No full textInternational audienceDuring plant development or interactions with pathogens, modifications of the plant cell wall occur. Among the enzymes involved, pectinases, particularly polygalacturonases (PGases), play a crucial role in the controlled hydrolysis of cell wall polysaccharides, leading to the formation of oligogalacturonides (OGs). These pectin-derived fragments act as key elicitors of plant defense responses, stimulating innate immunity and enhancing resistance to pathogens by modulating the expression of genes involved in immune responses and inducing the production of defense compounds. OGs are of particular interest for plant protection as a natural alternative to conventional phytosanitary products as they can be obtained through chemical, thermal, or enzymatic degradation of plant biomass. In a sustainable approach, agricultural by-products rich in pectin, such as citrus peels, apple pomace, or sugar beet pulp, offer an eco-friendly and cost-effective alternative for OG production. Thus, the current review aims to (i) update the state of the art about the different methods used to produce OGs, (ii) explore the potential of OGs as bio-based biocontrol molecules, and (iii) examine the relevance of new pectin sources for OG production