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Synthesis, Crystal Structure, Thermal Behavior, and Magnetic Properties of a Tetranuclear Mn(II) Complex Bridged by End-to-End Dicyanamide
No full textInternational audienceA new tetranuclear compound [Mn4(o-vanilin)6(N(CN)2)2(MeOH)2] (1) has been synthesized under reflux and structurally characterized by elemental analysis, IR, conductance measurement, variable temperature magnetic measurement and single crystal. The complex (1) crystallizes in the triclinic space group P-1 with unit cell dimensions a = 9.1014 (4) Å, b = 11.1169 (4) Å, c = 14.8923 (4) Å, = 93.698 (3)°, = 96.960 (3)°, = 107.165 (3)°, V = 1421.07 (9) Å3, Z = 1, R1 = 0.0345 and wR2 = 0.0798. The compound consist of two units [Mn2(o-Vanilin)3(MeOH)] with double 1,5-1,-1- dicyanamide (1,5-1,-1- DCA) bridges between neighboring manganese(II) atoms. Two Mn(II) are situated in an O4N inner, while the two others Mn(II) are encapsulated by an O5N inner. The two pentacoordinated Mn(II) ions are situated in square pyramidal environment, while the hexacoordinated Mn(II) ions environment is best described as octahedral geometry. Thermogravimetric analyze of the complex were carried out at 20–800 °C and showed that the complex were decomposed into three steps. Variable-temperature (5-300 K) magnetic susceptibility data reveal the existence of weak antiferromagnetic interaction in complex 1. The magnetic behavior is explained by considering the exchange coupled manganese-radical system, which is subjected to the MnII-O-MnII intradimer interactions. The least-squares fitting of the data results J = -0.8. Negligible interdimer exchange via Mn-DCA-Mn (Mn∙∙∙Mn of 8.4530(5) Å) was observed
Modalités d'influence du storytelling dans un contexte écologique
No full textInternational audienceAs part of action research, the implementation of methodological triangulation aims to understand better the overall influence of the organisations’ storytellings of that sell or rent electronic products claimed to be more ethical and ecological. The analyzes carried out make it possible, on the one hand, to observe a narrative convergence between audiences subscribing to a location offer and the discourse of the rental organization and, on the other hand, to show that for non-subscribing audiences of a location offer, rental storytelling arouses less interest than sale of refurbished devices. These results therefore lead to propose the exploration of a new research avenue according to which storytelling would be a method of communication more likely to reinforce existing attitudes and representations than to significantly change them.Dans le cadre d’une recherche-action, la mise en place d’une triangulation méthodologique vise à mieux comprendre l’influence globale des storytellings des organisations qui vendent ou louent des produits électroniques revendiqués plus éthiques et écologiques. Les analyses permettent, d’une part, d’observer une convergence narrative entre des publics souscripteurs d’une offre de location et le discours de l’organisation loueuse et, d’autre part, de montrer que, pour des publics non souscripteurs d’une offre de location, le storytelling locatif suscite moins d’intérêt que celui des offres de vente d’appareils reconditionnés. Ces résultats conduisent donc à proposer l’exploration d’une nouvelle piste de recherche selon laquelle le storytelling serait une méthode de communication plus susceptible de renforcer des attitudes et représentations existantes que de les changer significativement
Higher Catoids, Higher Quantales and their Correspondences
No full textInternational audienceAbstract We introduce omega-catoids as generalisations of (strict) omega-categories and in particular the higher path categories generated by computads or polygraphs in higher-dimensional rewriting. We also introduce omega-quantales that generalise the omega-Kleene algebras recently proposed for algebraic coherence proofs in higher-dimensional rewriting. We then establish correspondences between omega-catoids and convolution omega-quantales. These are related to Jónsson-Tarski-style dualisms between relational structures and lattices with operators. We extend these correspondences to (omega,p)-catoids, catoids with a groupoid structure above some dimension, and convolution (omega,p)-quantales, using Dedekind quantales above some dimension to capture homotopic constructions and proofs in higher-dimensional rewriting. We also specialise them to finitely decomposable (omega, p)-catoids, an appropriate setting for defining (omega, p)-semirings and (omega, p)-Kleene algebras. These constructions support the systematic development and justification of omega-Kleene algebra and omega-quantale axioms, improving on the recent approach mentioned, where axioms for omega-Kleene algebras have been introduced in an ad hoc fashion
Questions / réponses et Temps d'échange sur « L’animal est-il une personne ? – Sur la piste de la personnalité juridique de l’animal »
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Risques côtiers et évolution du littoral à long terme : apports de l’imagerie spatiale pour l’étude et la protection du patrimoine archéologique dans le cadre du projet SEMSPAT
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Augmenter la découvrabilité scientifique : accompagner l'auto-archivage dans HAL ?
No full textThis thesis investigates self-archiving practices within the French academic context by focusing on the open archive HAL. Adopting a socio-technical and informational approach, it explores deposit dynamics, metadata quality, and the underlying logics of discoverability. Grounded in an action research project conducted at the University of Toulon and centered on the development of the SoVisu platform, this work highlights the tensions between institutional guidelines and actual practices, with particular attention to disciplinary specificities in information and communication sciences. It proposes a typology of contributors and deposit logics, while examining issues of visibility, traceability, and evaluation within the broader framework of open science. By combining large-scale quantitative analysis and methodological reflexivity, this research provides a deeper understanding of how open archives are appropriated and their role in shaping contemporary scholarly communication.Cette thèse interroge les pratiques d’auto-archivage scientifique dans le contexte français, à travers une analyse approfondie de l’archive ouverte HAL. Elle articule une approche socio-technique et informationnelle pour examiner les dynamiques de dépôt, la qualité des métadonnées et les logiques de découvrabilité associées. S’appuyant sur une recherche-action menée à l’Université de Toulon et sur le développement du dispositif SoVisu, ce travail met en lumière les tensions entre prescriptions institutionnelles et pratiques effectives, ainsi que les spécificités disciplinaires, notamment en sciences de l’information et de la communication. Il propose une typologie des contributeurs et des logiques de dépôt, tout en explorant les enjeux de visibilité, de traçabilité et d’évaluation dans le cadre de la science ouverte. En croisant analyse quantitative massive et réflexivité méthodologique, cette recherche contribue à une meilleure compréhension des conditions d’appropriation des archives ouvertes et de leur rôle dans l’écosystème de la communication scientifique contemporaine
Pratiques inconstitutionnelles françaises à la lumière de l'histoire
No full textInternational audienceLa Constitution de 1958 a régulièrement été l’objet d’une pratique allant au-delà du texte. De sorte que la réflexion sur les pratiques inconstitutionnelles, quoiqu’ancienne, demeure forte. S’opposent en l’espèce deux visions : une vision normativiste, pour qui la pratique ne saurait se substituer à la norme au nom d’une lecture présidentialiste, et une vision politique, pour qui les textes ne peuvent faire l’objet d’une interprétation littérale, leur sens dépendant moins de l’agencement des dispositions constitutionnelles que de la pratique qui en est faite. Trancher sur ces différentes approches requiert de sortir du périmètre de la Ve République et de prendre le recul que seule permet une approche historique, d’autant plus opportune que l’histoire constitutionnelle de la France offre une richesse peu commune. Quelle méthode adopter pour mener à bien une analyse de ces pratiques inconstitutionnelles ? Quel constat dresser à partir de leur observation sur le temps long ? De quels moyens dispose-t-on pour les sanctionner ? C’est à ces questions qu’entreprend de répondre cet article
Multiple-step Siconi pre-clean advantages for Ni(Pt)Si film formation in the frame of advanced FDSOI technology development
No full textInternational audienceFor 28 nm Fully Depleted Silicon On Insulator (FDSOI) technology, based on HK-metal gate transistors, Ni-based silicide is used as contacts on active Si regions. The co-integration between metal gate transistors and Ni(Pt)Si formation reveals important challenges concerning the surface preparation before Ni (10 at.% Pt) deposition. This process could play a role in opening a path to Sulfuric Peroxide Mixture (SPM) chemistry propagation during Ni(Pt)Si formation, inducing the removal of the TiN layer inside transistor gates, also called "black gates". In this context, several NF3/NH3 dry pre-cleans (Siconi process) have been investigated to improve Ni(Pt)Si thin film formation in small dimensions, without damaging HKmetal gate structures. A significant reduction of Ni(Pt)Si-thickness non-uniformity is measured on blanket wafers in the case of a multiple-step Siconi process. Moreover, a different repartition of fluorine species is mainly detected at the interface between intermixing layer and Si substrate. Potentially new bonds could be identified at this interface in the case of multiple-step process. In addition, significant improvements in terms of silicide resistance and SRAM yield are measured for multiple-step Siconi process. This observation is attributed to the reduction of the number of "missing NiSi" and "black gates" defects through the introduction of this new surface preparation scheme
Do carotenoids protect phytodetritus-associated bacteria from oxidative stress?
No full textInternational audienceThis study focused on how carotenoid pigments in bacteria attached to phytoplankton protect them from singlet oxygen produced by phytoplankton during senescence, specifically under illumination of the diatom Thalassiosira sp. Its effect was analyzed on bacterial membrane structure (photooxidation of bacterial membrane lipids such as mono-unsaturated fatty acids (MUFAs) and on DNA repair system in two bacterial species, non-pigmented Pseudomonas stutzeri and pigmented Dinoroseobacter shibae. In P. stutzeri cells, 1O₂ transferred from phytodetritus was not completely scavenged by bacterial membranous MUFAs and reached the cytoplasm, allowing both 1O₂ and UV radiation to cause a rapid response of DNA repair systems. In D. shibae, scavenging by bacterial membrane MUFAs and quenching by spheroidenone allowed only a small fraction of 1O₂ to reach the cytoplasm, as shown by a delayed and lower repair system activation. The fact that Rhodobacteriales is the dominant order in bacterioplankton communities associated with algal blooms could thus be partly due to the protective effect of its constituent carotenoids against 1O₂- and UV-induced damage
New trends in line balancing and model sequencing in assembly, disassembly and manufacturing environments
No full textThe Assembly Line Balancing Problem (ALBP), first formally introduced by Salveson in 1955, has long been a foundational topic in operations research and production management. Over the past seven decades, ALBP has evolved significantly—from a straightforward task-to-station assignment problem to a complex, multi-objective optimization challenge that reflects the intricacies of contemporary manufacturing systems. This transformation has been especially pronounced in the last two decades, driven by the integration of Industry 4.0 technologies, increasing emphasis on sustainability, and the emerging human-centered paradigms associated with Industry 5.0. In this article, we review recent advancements and integrate contributions selected for this Special Issue, which builds on papers presented at the IFIP APMS 2021 and IFAC MIM 2022 conferences. With 37 papers selected from over 90 submissions, this Special Issue represents the first dedicated collection on ALBP since the 2006 special issue in the European Journal of Operational Research (EJOR), and it reflects the field’s remarkable progression during a period of profound transformation in manufacturing