Portail HAL UHA (Université de Haute-Alsace)
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Collections et archives: quelles enquêtes pour l'historien de l'Antiquité
No full textInternational audienceL’historien de l’Antiquité fréquente lui aussi des archives. Beaucoup de travaux récents illustrent les résultats de cette recherche : on peut mentionner des éditions ou études sur des correspondances scientifiques, ou bien la numérisation d’archives archéologiques anciennes ou encore l’entrée de collections privées dans les fonds d’archives des grands instituts ou centres de recherche. Le livre parcourt la succession des temps, qui façonne et biaise, construit ou déconstruit, plus qu’elle ne redécouvre, l’Antiquité.Avec les contributions suivantes:1.S.Pittia et M.T. Schettino, L’historien de l’Antiquité face aux collections et archives2.M. Dondin-Payre, Collections et archives : quelles enquêtes pour l’historien de l’Antiquité ? Le cas de l’épigraphie latine3.A. Marcone, Epistolario scientifico e cultura nazionale: la corrispondenza di Theodor Mommsen con gli studiosi italiani4.S. Wackenier, Un destin d'archives : les papiers de l'économe Dionysodôros (IIIe s. av. n.è.)5.L. Mercuri, Archives pour l’histoire de l’Italie méridionale et de la Sicile : la bibliothèque « Giustino Fortunato » de Rome6.I.Ilbold, Aux sources de l’internationalisation des sciences, Juliette Ernst et la bibliographie d’études classiques7.A. Vatican, Postfac
La Transformation Numérique Responsable : vecteur de changement organisationnel au sein des universités
No full textThème du congrès : « Le management public responsable et intégré : entre tradition et innovation »International audienc
Unintended patterns emerging from a declining creative hub: three critical moments of organizationality
No full textThème du congrès : « Creativity that Goes a Long Way »International audienc
Précisions sur la notion d'extension d'une construction existante dans le cadre d'un plan de prévention des risques naturels (CE, 18 juillet 2025, n° 492241)
No full textInternational audienc
Elaeis Guineensis OPMF as a Green Alternative Source of Cellulose Pulp Fibers for the Textile and Composite Industries
No full textInternational audienceThis study focuses on optimising the production of cellulose pulps from oil palm mesocarp fibres (OPMFs) by assessing their morphological, physico-chemical, and thermal properties for potential textile applications. Three extraction processes (i) alkaline-soda, (ii) acid-alkaline, and (iii) acid (Formacell) were developed, with variations in solution concentration, time, and temperature to assess their impact on cellulose quality. The extracted pulps were characterised by chemical composition analysis, photocolorimetry, crystallinity index (XRD), morphological analysis (SEM-EDX), thermal stability (TGA), and chemical structure assessment (FT-IR). The moisture content of OPMF cellulose varied depending on the extraction method: 12.4% for untreated fibres, 10.5–12.3% for the alkaline soda (TALC) process, 10.5–22.1% for the acid-alkaline process, and 7.2–17.9% for the acid process. In addition, spectrocolorimetry revealed that pulps from the TALC and acid-alkaline (TAAL) treatments had highest luminosity (L* 89.80–97.03) and highest colour absorption. XRD analysis showed a significant increase in crystallinity index, from 30.85% for untreated fibres to over 67% for TALC and TAAL pulps. FT-IR results of cellulose obtained by the different extraction processes showed that amorphous components were effectively separated, TAAL_15%_80_1 showed superior parameters in terms of highest purity index (86.8%) and highest stability temperature (399.85 °C). SEM images of cellulose reveal a porous and rough surface, attributed to the removal of surface components such as pectin, hemicellulose, lignin, silica, and other binding materials from around the fibre bundles. This structure indicates that it can be further modified to improve fibre strength and dye absorption. As result, acid alkaline treatment (TAAL) was found to be the most effective, with the highest purity (up to 86.8%), superior brightness (L* up to 97.03), lowest ash content (0.2–0.5%), and high crystallinity (65.27–68.76%), making it ideal for textile applications. OPMF is a promising raw material for the production of wet-spun cellulose yarns, offering a sustainable alternative to cotton and wood pulp, particularly in palm oil-producing regions. This aligns with global sustainability goals and supports circular economy initiatives
Chatbot et expérience client avenir et no future ?
No full textThème du congrès : « Marketing : Avenir et no Future ? , Marketing : Avenir et no Future ? Durabilité, humanisme et IA»International audienc
Poultry Manure-Derived Biochar Synthesis, Characterization, and Valorization in Agriculture: Effect of Pyrolysis Temperature and Metal-Salt Modification
No full textInternational audienceIn the present work, six biochars were produced from the pyrolysis of poultry manure at 400 • C and 600 • C (PM-B-400 and PM-B-600), and their post-modification with, respectively, iron chloride (PM-B-400-Fe and PM-B-600-Fe) and potassium permanganate (PM-B-400-Mn and PM-B-600-Mn). First, these biochars were deeply characterized through the assessment of their particle size distribution, pH, electrical conductivity, pH at pointzero charge, mineral composition, morphological structure, and surface functionality and crystallinity, and then valorized as biofertilizer to grow spring barley at pot-scale for 40 days. Characterization results showed that Fe-and Mn-based nanoparticles were successfully loaded onto the surface of the post-modified biochars, which significantly enhanced their structural and surface chemical properties. Moreover, compared to the control treatment, both raw and post-modified biochars significantly improved the growth parameters of spring barley plants (shoot and root length, biomass weight, and nutrient content). The highest biomass production was obtained for the treatment with PM-B-400-Fe, owing to its enhanced physico-chemical properties and its higher ability in releasing nutrients and immobilizing heavy metals. These results highlight the potential use of Fe-modified poultry manure-derived biochar produced at low temperatures as a sustainable biofertilizer for soil enhancement and crop yield improvement, while addressing manure management issues
A multi-armed approach of data rate optimization in LoRa
No full textInternational audienceLoRaWAN has emerged as a leading technology for long range, low-power communication in Internet of Things (IoT) networks. However, the default Adaptive Data Rate (ADR) mechanism suffers from limitations in balancing energy consumption, coverage, and reliability. In this work, we investigate ADR optimization strategies using the NS-3 LoRaWAN module, focusing on the impact of Spreading Factor (SF), Coding Rate (CR), and Transmission Power (TX). In the literature, this problem appears as a multi-objective optimisation problem. To solve this issue, We design MP-ADR, a multi-armed algorithm tested with the NS-3 LoRaWAN module. We investigate the impact of SF, CR, and TX, and perform a performance comparison with the default ADR. Extensive NS-3 simulations show that MP-ADR improves packet delivery ratio by 8%, reduces energy consumption by 33% and lowers latency by 16% compared to the default ADR. These results demonstrate the potential of MP-ADR as a scalable and energy-efficient solution for next-generation IoT deployments, heterogeneous environments.</div
NIR photothermal activation in epoxy/thiol polymerization
No full textInternational audienceEpoxy resins are widely employed in coatings and adhesives due to their mechanical strength, thermal stability, and adhesion properties. In recent years, the thiol–epoxy “click” reaction has emerged as a prominent approach in the field of photocuring, offering mild reaction conditions, high efficiency, and oxygen insensitivity. However, conventional UV-curing strategies are limited by shallow penetration depths and potential safety concerns. To overcome these limitations, we explored a near-infrared (NIR)-induced photothermal strategy to trigger epoxy/thiol polyaddition reactions. In this work, various thiol-based crosslinkers and thermal initiators were evaluated to optimize the formulation. Polymerization kinetics were monitored via Real-Time Fourier Transform Infrared Spectroscopy (RT-FTIR), and the photothermal effect of the different systems was characterized to assess the heat generation and curing efficiency. This study highlights the potential of NIR-activated thiol–epoxy systems as a safe and effective alternative for deep and rapid curing in advanced material applications
