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New Electromagnetic Interference Shielding Materials: Biochars, Scaffolds, Rare Earth, and Ferrite-Based Materials
No full textInternational audienceIn this review, a comprehensive systematic study of the research background, developments, classification, trends, and advances over the past few years in research on new electromagnetic interference (EMI) shielding materials will be described. The following groups of new materials for EMI shielding will be discussed: biochars, scaffolds, rare earth, and ferrite-based materials. We selected two novel, organic, lightweight materials (biochars and scaffolds) and compared their shielding effectiveness to inorganic materials (ferrite and rare earth materials). This article will broadly discuss the EMI shielding performance, the basic principles of EMI shielding, the preparation methods of selected materials, and their application prospects. Biochars are promising, eco-friendly, sustainable, and renewable materials that can be potentially used as a filter in polymer composites for EMI shielding, along with scaffolds. Scaffolds are new-generation, easy-to-manufacture materials with excellent EMI shielding performance. Rare earth (RE) plays an important role in developing high-performance electromagnetic wave absorption materials due to the unique electronic shell configurations and higher ionic radii of RE elements. Ferrite-based materials are often combined with other components to achieve enhanced EMI shielding, mechanical strength, and electrical and thermal conductivity. Finally, the current challenges and future outlook of new EMI shielding materials will be highlighted in the hope of obtaining guidelines for their future development and application.</div
Conception bio-inspirée et technologie MEMS pour les robots volants miniatures
No full textNational audienceLa conception d’un robot volant miniature impose des contraintes strictes en matière de taille et de consommation énergétique, rendant inadaptées les approches classiques utilisées à plus grande échelle. Il est donc nécessaire de repenser entièrement chaque étape du développement. Ce travail propose une démarche bio-inspirée, fondée sur l'observation des insectes, ainsi que des concepts spécifiquement conçus pour relever ces défis. Une analyse approfondie, s’appuyant à la fois sur des simulations numériques et des essais expérimentaux, est ensuite présentée. Les prototypes réalisés, d’un poids de seulement 22 mg, avec une envergure de 25 mm et une longueur de 15 mm, sont capables de générer une force de portance équivalente à leur propre poids
Ability and adsorption processes of anionic dye by polymer and surfactant-based organoclays
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Valorization of dredged sediments: Influence of sediment content on mechanical properties and environmental behavior
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Enzymatic-controlled production and characterization of bio-based oligogalacturonides for application in wheat protection against powdery mildew.
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Corneal endothelial dysfunction treatments: Recent advances in non-invasive treatment strategies
No full textInternational audienceThe corneal endothelium plays an essential role in the maintenance of a healthy vision. However, in contrast to epithelial cells with high proliferation rates and a turnover lifespan of six to seven days that allows maintenance of constant cell density and high control of cell adhesion, human corneal endothelial cells (HCECs) do not normally proliferate. Therefore, loss of HCECs density over time leads to corneal transparency loss, and the development of corneal edema, bullous keratopathy and other eye diseases. Developments for repairing HCECs are continuously searched for and are evolving around possible topical drug applications as well as emerging strategies such as CRISPR-Cas9 gene editing, antisense oligonucleotides (ASOs) and nanotechnological concepts. Here, the state-of-the-art treatment strategies for corneal endothelial diseases (e.g. Fuch's endothelial corneal dystrophy (FECD), corneal edema, bullous keratopathy) will be outlined with a special focus on where topical applications have shown positive therapeutic outcomes
Theoretical study of randomly distributed gold nanoparticles as potential plasmonic physically unclonable functions
No full textInternational audienceWe theoretically study a random arrangement of cylindrical gold nanoparticles (NPs) deposited on a dielectric/gold substrate as a potential plasmonic physically unclonable function (PUF). We use the coupled dipole approximation (CDA) method in order to reduce the computation time and memory demand. Each NP is modeled as a single electric dipole through the polarizability tensor of a spheroidal-shaped NP, while the interparticle coupling is described by Green’s tensors. The concept of plasmonic PUF considered here consists of transforming the electric field maps obtained by the CDA into 2D-binary matrices using a key generation algorithm. A PUF must satisfy different criteria to be efficient, including uniqueness that is evaluated by the distributions of Hamming inter-distances. In this work, we propose to evaluate the uniqueness property of different PUFs characterized by substrates whose dielectric layer thickness is variable. We also test the ability to generate unique keys when the challenges to which our PUF concept is subjected change, namely, the wavelength, angle, and plane of incidence
Le concile de Nicée (20 mai-25 juillet 325)
No full textInternational audienceL'article donne quelques points de repères concernant le Concile et met en évidence le contexte de sa tenue, ses conclusions et sa singularité dans l'histoire chrétienne
Chapitre 3. Les travaux des historiens : un matériau pour renouveler la théologie chrétienne des relations à Israël, de la fin des années 1930 à nos jours
No full textInternational audienceCe chapitre retrace l'apport des historiens à la question traitée par le manuel