Oskar Bordeaux
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Lightweight Biometric Authentication Mechanism Using PPG Signals for WBAN
No full textThis paper presents the implementation and evaluation of a fully embedded and lightweight biometric authentication mechanism for resource-constrained nodes in Wireless BodyArea Sensor Networks (WBANs). This mechanism uses realtime photoplethysmography (PPG) signal processing to generate binary sequences, which are compared between nodes to verify their respective identity. Authentication is granted when similarity between the binary sequences of two independent nodes exceeds a threshold. It allows nodes within the same WBAN, on the same person, to establish further and secure communication. The entire authentication mechanism is deployed on low-power embedded hardware and communicates via a lightweight publishsubscribe protocol. Experimental results from intra- and interperson scenarios confirm the accuracy and robustness of the implemented biometric authentication mechanism on resourceconstrained hardware
Solutions fondées sur la nature et valorisation par les consommateurs
Get PDFCet article est une contribution originale à l’étude de la valorisation par le marché des solutions fondées sur la nature en agroécologie. En se focalisant sur la performance en termes de biodiversité des exploitations viticoles, nous montrons, à l’aide d’un indicateur simple de codes couleurs (« Biodiv-Score » créé pour cette occasion) comment cette valorisation est mesurable en termes d’augmentation du consentement à payer des consommateurs pour un vin. Nous montrons de plus que le premium obtenu pour le Biodiv-Score le plus élevé peut égaler celui de la certification agriculture biologique. Cela suggère que la bonne performance en biodiversité constitue non seulement un critère de valorisation incontournable pour la certification agriculture biologique, mais aussi un atout majeur pour les vins non certifiés. En ce sens, la mobilisation des solutions fondées sur la nature est un levier de valorisation commun à tous les systèmes viticoles, en particulier chez les générations les plus jeunes
Insights Into the Almond Domestication History
No full textUnderstanding crop domestication offers crucial insights into the evolutionary processes that drive population divergence and adaptation. It also informs the identification of genetically diverse wild germplasm, which is essential for breeding and conservation efforts. While domestication has been extensively studied in many Mediterranean fruit trees, the evolutionary history of the almond ( Prunus dulcis ) remains comparatively underexplored. To address this, we analyzed 209 wild and cultivated almond accessions sampled across Eurasia and genotyped with 23 microsatellite markers. Using population genetics and coalescent‐based inference, we reconstructed the domestication history of P. dulcis and its relationships with wild relatives. Bayesian clustering revealed four genetically distinct clusters of cultivated almonds: Turkish, Caucasian–Central Asian, Southern Spanish, and European/North American. These groups were differentiated from wild almond species—including Prunus turcomanica , Prunus orientalis , Prunus fenzliana , and Prunus spinosissima —each forming its gene pool across the Middle East and Central Asia. Approximate Bayesian Computation (ABC) supported a single domestication event in the Middle East, originating from either P. orientalis or P. turcomanica , with subsequent gene flow from P. fenzliana and P. spinosissima into the Turkish and Central Asian cultivated gene pools, respectively. We also inferred reciprocal introgression from cultivated almonds back into wild populations. Notably, sharka resistance—caused by plum pox virus (PPV)—was identified in three P. dulcis clusters and P. fenzliana , suggesting that resistance may have arisen independently or been maintained through crop–wild introgression. Together, our results highlight a complex and protracted domestication history for almond, shaped by contributions from multiple wild relatives and recurrent gene flow. These findings enhance our understanding of perennial crop evolution and underscore the value of wild germplasm in breeding programs aimed at increasing resilience in fruit trees.ADAPTATION DES CULTURES FRUITIÈRES AU CHANGEMENT CLIMATIQUE DANS LE BASSIN MÉDITERRANÉENExploiting the Untapped potential of Fruit tree Wild DIVersity for Sustainable Agricultur
Unique raw material and unknown perforation techniques: specificities of the lapidary production in the Ceramic Age of the Lesser Antilles
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Metagenome-scale metabolic modelling for the characterization of cross-feeding interactions in freshwater cyanobacteria-associated microbial communities
No full textFavored by global changes, freshwater cyanobacterial harmful blooms (HCBs) generate increasing ecological, economical and public health challenges. Microcystis, one the most pervasive genera of cyanobacteria, grows within a phycosphere where specialized interactions with its microbiome occurs, and are suspected to influence bloom appearance and its potential toxicity.Through metagenomic, metabolomic and metabolic modelling, we characterized twelve Microcystis phycosphere cultured after isolation from a French pond. Metagenomic revealed that associated bacteria introduce new functions to the phycosphere, while functional redundancy within and across communities remains. Metabolic reaction presence in Microcystis is consistent with their genospecies, whereas community-levelmetabolic landscape diverges cyanobacteria’s phylogeny. On the other hand, metabolomic results lean on metabolic output led by cyanobacteria. Metabolic modelling and identification of toxic secondary metabolites biosynthetic gene cluster further highlighted differences between phycosphere metabolic capabilities and the importance of manual curation of secondary metabolism in GSMNs. These findings deepen understanding of Microcystis’ phycosphere functioning, demonstrate the relevance of multi-omics systems biology approaches, and lay the ground for further characterisation of freshwater HCB’s microbial interactions and inter-species complementarity
Assessment of Electromagnetic Board Level Shielding Using Continuous Carbon Fiber
No full textThis paper presents an assessment of electromagnetic attenuation at the board level over a frequency range of 1 MHz to 8.5 GHz, utilizing two materials: copper, used as a reference, and Continuous Carbon Fibers (CCF), an innovative composite material produced by Fused Deposition Modeling (FDM). Various measurement techniques, including TEM and GTEM cells, Mode-Stirred Reverberation Chamber (MSRC), and near-field probes, were employed to evaluate the attenuation characteristics. Experimental results indicated that while copper offers superior attenuation consistently across the frequency range, CCF demonstrated significant attenuation in specific frequency bands, making it a promising shielding solution. The potential of CCF is further enhanced by its mechanical properties, light weight, and the fabrication flexibility offered by the FDM process. Detailed material characterization was performed, revealing the composition and structural properties of the CCF filament. FEM simulations, coupled with experimental data, allowed for the identification of the most relevant electromagnetic attenuation characterization techniques for this specific test vehicle by confirming the hypotheses established after measurement. The influence of the guard ring design on the overall attenuation performance was also extensively analyzed through FEM simulations, underscoring the importance of optimized via layout and grounding connections to enhance attenuation, with a focus on the waveguide-below-cutoff principle. Furthermore, the simulations enabled the modeling of the CCF material, paving the way for exploring its electromagnetic performance in various applications. This study provides valuable insights for the design of electromagnetic shields using both traditional and innovative materials, offering potential improvements in the performance and versatility of board-level shielding solutions