Strongly correlated growth of Rydberg aggregates in a vapor cell

The observation of strongly interacting many-body phenomena in atomic gases typically requires ultracold samples. Here we show that the strong interaction potentials between Rydberg atoms enable the observation of many-body effects in an atomic vapor, even at room temperature. We excite Rydberg atoms in cesium vapor and observe in real-time an out-of-equilibrium excitation dynamics that is consistent with an aggregation mechanism. The experimental observations show qualitative and quantitative agreement with a microscopic theoretical model. Numerical simulations reveal that the strongly correlated growth of the emerging aggregates is reminiscent of soft-matter type systems

Is the meiofauna a good indicator for climate change and anthropogenic impacts?

Our planet is changing, and one of the most pressing challenges facing the scientific community revolves around understanding how ecological communities respond to global changes. From coastal to deep-sea ecosystems, ecologists are exploring new areas of research to find model organisms that help predict the future of life on our planet. Among the different categories of organisms, meiofauna offer several advantages for the study of marine benthic ecosystems. This paper reviews the advances in the study of meiofauna with regard to climate change and anthropogenic impacts. Four taxonomic groups are valuable for predicting global changes: foraminifers (especially calcareous forms), nematodes, copepods and ostracods. Environmental variables are fundamental in the interpretation of meiofaunal patterns and multistressor experiments are more informative than single stressor ones, revealing complex ecological and biological interactions. Global change has a general negative effect on meiofauna, with important consequences on benthic food webs. However, some meiofaunal species can be favoured by the extreme conditions induced by global change, as they can exhibit remarkable physiological adaptations. This review highlights the need to incorporate studies on taxonomy, genetics and function of meiofaunal taxa into global change impact research

Is the meiofauna a good indicator for climate change and anthropogenic impacts?

Our planet is changing, and one of the most pressing challenges facing the scientific community revolves around understanding how ecological communities respond to global changes. From coastal to deep-sea ecosystems, ecologists are exploring new areas of research to find model organisms that help predict the future of life on our planet. Among the different categories of organisms, meiofauna offer several advantages for the study of marine benthic ecosystems. This paper reviews the advances in the study of meiofauna with regard to climate change and anthropogenic impacts. Four taxonomic groups are valuable for predicting global changes: foraminifers (especially calcareous forms), nematodes, copepods and ostracods. Environmental variables are fundamental in the interpretation of meiofaunal patterns and multistressor experiments are more informative than single stressor ones, revealing complex ecological and biological interactions. Global change has a general negative effect on meiofauna, with important consequences on benthic food webs. However, some meiofaunal species can be favoured by the extreme conditions induced by global change, as they can exhibit remarkable physiological adaptations. This review highlights the need to incorporate studies on taxonomy, genetics and function of meiofaunal taxa into global change impact research

Cover Page 1) Title of the paper: PERCEPTUAL DFT WATERMARKING WITH IMPROVED DETECTION AND ROBUSTNESS TO GEOMETRICAL DISTORTIONS

title = {Perceptual DFT watermarking with improved detection and robustness to geometrical distortions}, journal = {Accepted for publication in IEEE Transactions o

Assessment of consolidation of oxide dispersion strengthened ferritic steels by spark plasma sintering: from laboratory scale to industrial products

International audienc

Vieillissement thermique des alliages de zirconium-niobium en phase α (570 °C)

Les propriétés d'usage (corrosion, propriétés mécaniques) des alliages de zirconium-niobium dépendent étroitement des microstructures obtenues à l'état final de fabrication. De fait, l'obtention à l'état final d'une dispersion fine et homogène de phases précipitées d'équilibre βNb dans la matrice α améliore le comportement en service de ces alliages. Ce travail concerne donc l'étude de la cinétique de précipitation du βNb en phase α (à 570°C) à partir de structures similaires à celles rencontrées à l'issue de traitements thermiques de fabrication ou de soudage (ZAT). L'utilisation de la calorimétrie et de la mesure du Pouvoir ThermoElectrique, a permis de suivre et de quantifier cette cinétique. Enfin, l'étude des mécanismes de précipitation du βNb, au cours des vieillissements thermiques, a été menée à partir d'une structure contenant initialement des phases βZr métastables et ceci, en particulier grâce à l'utilisation de la dissolution anodique, protocole expérimental original quant à son application aux alliages de Zr