Portail des publications scientifiques IMT Mines Alès
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Transcultural adaptation of the bath CRPS body perception disturbance scale into French
No full textInternational audienceBody perception disturbances are a typical symptom among people with Complex Regional Pain Syndrome (CRPS). To assess it, the Bath CRPS Body Perception Disturbance Scale (B-BPDS) is a comprehensive tool which was validated in English and translated/validated in German and Japanese. To date, no French version was available. We translated the B-BPDS in French using the forward-backward method to obtain a French version (B-BPDS-F). Then, we examined its internal consistency, concurrent validity and structural validity. 32 participants were included for the first evaluation and 21 for the second. Internal consistency of the B-BPDS-F was adequate after removing item 3 on attention. B-BPDS-F was significantly correlated with pain at rest, quality of life total score and anxiety/depression dimensions. Exploratory Factor Analysis showed 2 main factors which explain 63 and 31% of the total variance. ICC was found acceptable. Our results are in line with previous work and provide a valid measurement tool in French
Approche expérimentale et modélisation hygrothermique de matériaux géosourcés et biosourcés soumis à des sollicitations climatiques transitoires
No full textNational audienceThis poster presents an experimental and numerical study of the hygrothermal behavior of geosourced and biosourced materials under transient climatic conditions. Laboratory experiments were conducted to characterize the thermal and hygroscopic properties of these materials. Hygrothermal tests on wall were performed to monitor temperature and humidity variations and to highlight the benefits of materials with thermal inertia. Numerical simulations based on heat diffusion models were implemented to predict energy performance, comparing a single-layer wall made of glass wool with one made of wood fiber.Ce poster présente une étude expérimentale et numérique du comportement hygrothermique de matériaux géosourcés et biosourcés soumis à des sollicitations climatiques transitoires. Des expérimentations en laboratoire ont permis de caractériser les propriétés hydriques et thermiques des matériaux étudiés. Des essais hygrothermiques sur parois ont été réalisés pour suivre l’évolution de la température et de l’humidité et mettre en évidence l’intérêt d’un matériau à caractère inertiel. Des simulations numériques basées sur des modèles de diffusion thermique ont été mises en œuvre pour prédire les performances énergétiques, en comparant une paroi monocouche en laine de verre à une paroi en fibre de bois
Assessing the impact of The Climate Fresk workshop on climate-related attitudes and behavioral intentions in the workplace: study protocol for a randomized controlled trial
No full textV1. Preprint not peer reviewedBackground: As the urgency of climate action grows, innovative educational approaches are needed to bridge the gap between knowledge and commitment. The Climate Fresk, a collaborative and gamified workshop based on IPCC reports, has reached millions worldwide, but rigorous evidence on its effectiveness remains limited.Objective: This study protocol describes the first randomized controlled trial assessing the impact of The Climate Fresk on climate-related attitudes and pro-environmental behavioral intentions among workers. Secondary objectives are to examine potential moderating factors, such as socio-demographic characteristics, ecological identity, emotions, facilitator expertise and organisation status, to qualitatively explore participants’ perceptions, motivations, and barriers.Methods: We will conduct a parallel, mixed-method RCT including 1,354 participants recruited from French organizations. Eligible participants will be randomized (1:1) to either the experimental arm (The Climate Fresk, a three-hour interactive workshop) or the control arm (a one-hour lecture-style video). Primary outcomes are climate-related attitudes and pro-environmental behavioral intentions, assessed at baseline (T0) and one week post-intervention (T2). Secondary outcomes include ecological identity, emotions, and prior behaviors. Semi-structured interviews with a subsample of participants (n=20) will be conducted one month later (T3). Quantitative data will be analyzed using linear mixed-effects models, accounting for clustering by facilitator and organization. Qualitative data will undergo thematic analysis.Discussion: This trial will provide the first large-scale, controlled evidence on the effectiveness of The Climate Fresk in shaping attitudes and intentions toward climate action. By integrating quantitative and qualitative insights, and considering moderating factors, it aims to advance understanding of gamified climate education and inform strategies to engage diverse populations in sustainability transitions
Optimizing dispatch strategies for CSP plants: A Monte Carlo simulation approach to maximize annual revenue in Chile’s renewable energy sector
No full textInternational audienceAs Chile solidifies its position as a global leader in renewable energy, the intermittent and variable nature of solar and wind increasingly challenges grid stability. Concentrated Solar Power (CSP) with Thermal Energy Storage (TES) provides dispatchable, high-value electricity that can mitigate curtailment and enhance grid reliability. This study uses a Monte Carlo framework to evaluate 1,000,000 potential dispatch strategies for a 100 MW CSP facility in the Atacama, leveraging historical marginal cost data from the Cardones line (May 2023–April 2024). The best dispatch strategy achieves $60,103,253 in annual revenue, surpassing most scenarios. Specifically, the capacity factor rises 94.11% above average, while revenue increases 106.8%. Stable output under varying solar conditions underscores CSP’s ability to sustain steady generation, support higher renewable penetration, and strengthen the energy supply. Granting CSP plants greater autonomy in dispatch decisions can enhance profitability and grid resilience. By leveraging data-driven optimization, CSP technology could play a pivotal role in meeting Chile’s ambitious renewable goals, reducing curtailment, and bolstering overall system efficiency
Influence de la qualité de la pâte du béton parent sur la cure interne dans des bétons à base de granulats recyclés et à faible rapport eau sur liant
No full textEuropean Directive 2008/98/EC and French Ordinance no. 2010-1579 aim to increase the recycling of construction waste. In response, this study explores the use of recycled aggregates (RAs) from controlled source concretes (SC) to improve the durability and performance of recycled concretes (RC), particularly those with a low water to cement ratio (W/C).This thesis try to answer questions relating to the quality of recycled aggregates, the performance of recycled concretes and the improvement of internal curing effects:1. How does the quality of the parent concrete paste influence the properties of recycled aggregates, in particular their porosity, water absorption and hardness?2. How do these recycled aggregates affect the mechanical and hydric performance of the recycled concrete made with them? This research work examines, in particular, how recycled aggregates can improve the hydration of the new cement paste, reduce endogenous shrinkage, and thus improve certain durability parameters of recycled concrete.3. How recycled aggregates from standard parent concretes can act as effective internal curing agents, improving the new cement paste and reducing the risk of self-drying cracking?Two types of SC were produced: a building concrete (C25/30) and a civil engineering concrete (C40/50). These SCs were crushed to produce RAs, which were then used to create RCs of different strength classes (C25/30, C40/50, C60/75, and C80/95). The properties of the RAs, such as granulometry, water absorption, porosity, and hardness, were analyzed.Quality of Recycled Aggregates: The quality of the SC paste significantly influences the properties of the RAs. RAs from the higher-quality SC-C40/50 showed better paste quality and lower porosity compared to those from SC-C25/30.Internal Curing: RAs can act as internal curing agents by releasing water to hydrate the new cement paste, thus reducing autogenous shrinkage and improving the durability of the RC.Mechanical and Hydric Properties: RCs made with RAs show varying mechanical and hydric performances depending on the quality of the RAs. Higher-quality RAs (from SC-C40/50) led to RCs with better strength and lower porosity.The results indicate that the quality of the SC is crucial for the performance of the RAs and, consequently, the RCs. RAs from high-quality SCs (C40/50) are more effective for internal curing, enhancing cement paste hydration and reducing autogenous shrinkage. The porosity and hardness of the RAs are also key factors for the durability of the RCs.The study demonstrates that using RAs from controlled SCs can significantly improve the performance of RCs, especially those with low W/C ratios. This offers a viable solution to meet recycling requirements while producing durable and high-performance concrete.This research supports the increased integration of RAs in structural concrete, contributing to environmental sustainability and effective construction waste management. Future studies should focus on the kinetics of desorption of recycled aggregates, hydration of the new paste and cementation between the new and old paste in order to gain a better understanding of this complex phenomenon of structuring between the aggregate and the new paste.La directive européenne 2008/98/CE et l'Ordonnance française n°2010-1579 visent à augmenter le recyclage des déchets de construction. En réponse, cette étude explore l'utilisation de granulats recyclés (GR) issus de bétons parents (BP) contrôlés pour améliorer la durabilité et la performance des bétons recyclés (BR), particulièrement ceux à faible rapport eau/liant (E/C).Ce mémoire cherche à répondre aux questions relatives à la qualité des granulats recyclés, à la performance des bétons recyclés et à l’amélioration des effets de cure interne :1. Comment la qualité de la pâte du béton parent influence-t-elle les propriétés des granulats recyclés, notamment leur porosité, leur absorption d'eau, et leur dureté ?2. Comment ces granulats recyclés affectent-ils les performances mécaniques et hydriques des bétons recyclés fabriqués avec eux ? Ce travail de recherche examine, en particulier, comment les granulats recyclés peuvent améliorer l'hydratation de la nouvelle pâte de ciment, réduire le retrait endogène, et ainsi améliorer certains paramètres de durabilité des bétons recyclés.3. Dans quelle mesure les granulats recyclés issus de bétons parents standards peuvent-ils agir comme agents de cure interne efficaces, en améliorant la nouvelle pâte de ciment et en réduisant les risques de fissuration par auto-dessication ?Deux types de BP ont été fabriqués en centrale : un béton de bâtiment (C25/30) et un béton de génie civil (C40/50). Ces BP ont été concassés pour produire des GR, qui ont ensuite été utilisés pour fabriquer des BR de différentes classes de résistance (C25/30, C40/50, C60/75, et C80/95). Les propriétés des GR, telles que la granulométrie, l'absorption d'eau, la porosité, et la dureté, ont été analysées.La qualité de la pâte du BP influence les propriétés des GR. Les GR issus du BP-C40/50, plus performants, ont montré une meilleure qualité de pâte et une résistance à l’attrition supérieure comparativement aux GR issus du BP-C25/30.Les GR peuvent agir comme agents de cure interne en libérant de l'eau pour hydrater la nouvelle pâte de ciment, réduisant ainsi le retrait endogène et améliorant la qualité de pâte du BR.Les bétons recyclés fabriqués avec des GR montrent des performances mécaniques et hydriques variables selon la qualité des GR. Les GR de meilleure qualité (issus du BP-C40/50) ont conduit à des bétons recyclés pouvant atteindre une meilleure résistance et une porosité plus faible que des bétons témoins.Les GR issus de BP (C40/50) sont relativement efficaces pour la cure interne, améliorant l'hydratation de la pâte de ciment et réduisant le retrait endogène. La porosité et la dureté des GR sont également des facteurs déterminants pour la durabilité des BR.L'étude démontre que l'utilisation de GR issus de BP contrôlés peut améliorer significativement la performance des bétons recyclés, particulièrement ceux à faible rapport E/C. Cela offre une solution viable pour répondre aux exigences de recyclage tout en produisant des bétons durables et performants.Cette recherche soutient l'intégration accrue de GR dans les bétons structurels, contribuant ainsi à la durabilité environnementale et à la gestion efficace des déchets de construction. Les futures études devraient se concentrer sur les cinétiques de désorption des granulats recyclés, d’hydratation de la nouvelle pâte et de cémentation entre la nouvelle et l’ancienne pâte afin de mieux comprendre ce phénomène complexe de structuration entre le granulat et la nouvelle pâte
A feasibility assessment of low-carbon concrete containing calcined clay and granite powder or dolomitic limestone in Burkina Faso
No full textInternational audienceThe development of low-carbon concrete (LCC) is crucial for reducing the large carbon footprint of the construction sector, in countries like Burkina Faso where there is a lack of high-purity limestone to produce clinker, resulting in the importation of clinker, which exists in dolomitic limestone form. This study assesses the feasibility of producing such LCC in Burkina Faso by utilizing local resources. It designs a class C25/30 concrete, containing 330 kg of cement per m3, where ordinary Portland cement was partially replaced (up to 50%) with a mix of calcined metakaolin clay (30%) and granite powder or dolomitic limestone (10–20%). Results show that the synergy between metakaolin and granite powder significantly improves performance. The optimal mixture, 60C30M10G, achieved a 28-day compressive strength of 35 MPa, representing a 35% increase over the reference concrete, while also enhancing tensile strength and resistance to acid attack and water absorption. This is due to a densified microstructure resulting from pozzolanic reactions and filler effects. Furthermore, the 50C30M20G design reduced CO₂ emissions by 30% while still meeting the target strength class. In contrast, dolomitic limestone provided a modest improvement. This study confirms the potential for high-performance, low-carbon concrete adapted for the West African context, aligning the circular economy with sustainable infrastructure development
MOOC on Linguistic Linked Data
No full textInternational audienceThe field of linguistic linked data lies at the intersection of the Semantic Web and linguistics and studies techniques and tools aimed at modelling and publishing language resources on the Web, in ways that enable their data interoperability and reuse. In order to support learning in this area and train a new generation of researchers and practitioners, the NexusLinguarum COST Action developed a MOOC on linguistic linked data. This freely accessible MOOC is unique in its kind and has been prepared by experts with broad experience in the field. During the course, students acquire fundamental concepts of linguistic linked data and gain practical experience with related tools and techniques. The MOOC consists of two courses: (i) essentials, which covers basic tools and modelling techniques (e.g., Ontolex-Lemon, SPARQL, VocBench, NIF) and (ii) advanced topics, covering more advanced contents like metadata, lexicography, terminology, deep learning and linguistic data, and a real use-case. The courses are self-paced and the expected duration of both is seven weeks. We expect the course to have a strong impact by promoting the combination of Semantic Web technologies with linguistics and data science, which is crucial in fields of emerging studies such as linguistic data science. The community behind this initiative is well-anchored and coordinates multiple recent standards for linguistic knowledge representation increasingly adopted by linguists
Impact of Sensor Degradation on Measurement Uncertainty in Prognostics and Maintenance Decision-Making : State of the Art andChallenges
No full textInternational audiencePrognostics and maintenance decision-making rely heavily on accurate and reliable measurements derived from sensors. However, sensor degradation introduces measurement uncertainties that compromise the precision of fault detection, remaining useful life estimation, and overall maintenance strategies. This paper provides a comprehensive review of the multifaceted impacts of sensor degradation on measurement uncertainty and its subsequent influence on prognostics and maintenance. The paper synthesizes various sensor degradation mechanisms and existing modelling techniques, emphasizing the growing research focus on developing accurate degradation models. The review also provides an in-depth analysis of how sensor degradation affects measurement uncertainty, exploring both qualitative and quantitative impacts through various modelling approaches and tools. Furthermore, this review examines the implications of this uncertainty on prognostics and maintenance decision-making methodologies, showcasing current mitigation methods and models. Finally, the review identifies key challenges and research gaps, outlining promising directions for future research in sensor degradation and its impact on prognostics and maintenance. By addressing these critical issues, this paper contributes to the advancement of more reliable, adaptive, and efficient Prognostics and Health Management (PHM) systems across various industrial and technological domains
WebXAII: an open-source web framework to study human-XAI interaction
No full textThis article introduces WebXAII, an open-source web framework designed to facilitate research on human interaction with eXplainable Artificial Intelligence (XAI) systems. The field of XAI is rapidly expanding, driven by the growing societal implications of the widespread adoption of AI (and in particular machine learning) across diverse applications. Researchers who study the interaction between humans and XAI techniques typically develop ad hoc interfaces in order to conduct their studies. These interfaces are usually not shared alongside the results of the studies, which limits their reusability and the reproducibility of experiments. In response, we design and implement WebXAII, a web-based platform that can embody full experimental protocols, meaning that it can present all aspects of the experiment to human participants and record their responses. The experimental protocols are translated into a composite architecture of generic views and modules, which offers a lot of flexibility. The architecture is defined in a structured configuration file, so that protocols can be implemented with minimal programming skills. We demonstrate that WebXAII can effectively embody relevant protocols, by reproducing the protocol of a state-of-the-art study of the literature