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Spectroscopy and complex-time correlations using minimally entangled typical thermal states
No full text15 pages, 15 figuresInternational audienceTensor network states have enjoyed great success in capturing aspects of strong correlation physics. However, obtaining dynamical correlators at nonzero temperatures is generically hard even using these methods. Here, we introduce a practical approach to computing such correlators using minimally entangled typical thermal states (METTS). While our primary method directly computes dynamical correlators of physical operators in real time, we propose extensions where correlations are evaluated in the complex-time plane. The imaginary time component bounds the rate of entanglement growth and strongly alleviates the computational difficulty allowing the study of larger system sizes. To extract the physical correlators, one must take the limit of purely real-time evolution. We present two routes for obtaining this information: (i) via an analytic correlation function in complex time combined with a stochastic analytic continuation method to obtain the real-time limit and (ii) a Hermitian correlation function that asymptotically captures the desired correlation function quantitatively. We show that these numerical techniques capture the finite-temperature dynamics of the Shastry-Sutherland model—a model of interacting spins one-half in two spatial dimensions
Thiosugar-functionalized gold(I)-NHC complexes as selective anticancer agents for potential targeted therapy
No full textInternational audienceFour novel gold(I) N-heterocyclic carbene (NHC) complexes were synthesized and characterized; they are tuned in terms of the aromatic extension of the NHC scaffold and two of them contain a thiosugar residue to enhance their cellular uptake. To verify their potential interaction with human serum albumin (HSA), ESI-MS interaction analysis and fluorescence titrations were performed. Biological studies were carried out to evaluate their possible cytotoxic effect on three ovarian cancer cell lines, i.e., A2780 (both sensitive and cisplatin-resistant), and SKOV-3. Confocal microscopy and fluorescence-activated cell sorting tests were also carried out for the four complexes. Thiosugar conjugation proved to be an effective strategy to enhance potency and selectivity, resulting in a considerable improvement compared to the corresponding complexes lacking the thiosugar moiety. Furthermore, six bioconjugates containing targeting peptides were synthesized; in most cases, no significant improvement in either cytotoxic activity or selectivity was observed, except for the LHRH peptide conjugates, which showed a slight enhancement in both cytotoxicity and selectivity compared to the unconjugated complexes
Development and Validation of a Frequency-Based Quality Index for Contactless Respiratory Volume Analysis
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Leveraging Angle of Arrival Estimation against Impersonation Attacks in Physical Layer Authentication
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Unveiling the Interactions between a Protein Derived from Barnacle Adhesive and Surfaces Using Surface Plasmon Resonance Imaging
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Droit de visite en présence d'une mesure d'assistance éducative : la répartition de compétence entre juge des enfants et juge aux affaires familiales à nouveau rappelée
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En passant par Lavaur : vagabondage d’un patrimoine enchanté, la Nationale 7
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How generics obscure the logic of conditionals
No full textInternational audienceThis paper discusses counter‐examples to modus ponens and modus tollens involving modals and quantificational adverbs, and presents new counter‐examples with generic conditionals. We argue that the counter‐examples are spurious, and are explained by the domain‐restricting effects of if ‐clauses. Generic conditionals are especially problematic because the generic operator is silent and detectable only through its interpretive effects. A second, experimental case study involving nested conditionals illustrates the ease with which generic conditionals can mislead theorists about the logic of conditionals. To avoid pitfalls, theorists choosing examples and designing experimental materials must pay close attention to the special linguistic properties of generics
Did the 2019 Notre-Dame Cathedral Fire impact the lead contamination of sediment in the Seine River in Paris, France?
No full textInternational audienceThe fire that affected Notre-Dame Cathedral in Paris in 2019 has reignited concerns about metal contamination including lead (Pb) in the city. The current research investigated the potential contribution of this event to the contamination of sediment transiting the Seine River. To this end, sediment deposits were collected in Paris just after floods in 2016 (i.e. before the fire), as well as in 2020 and 2021 (i.e. after the fire). They were analysed for fallout radionuclides, organic matter, metal concentrations and Pb isotopic ratios. Results showed that the material deposited by the flood exhibited contrasted characteristics and contamination levels depending on the flood. The major flood event that took place in June 2016 mainly consisted of surface recent material from the upper reaches of the river. This likely explains the large homogeneity of sediment across Paris and the relatively low metal contamination. Then, the occurrence of a lower magnitude flood event in 2020 led to the deposition of a large majority of older subsurface material, likely resuspended from the channel or eroded from the banks. This material showed higher contamination levels than in 2016. Pb levels were particularly significantly higher around Notre-Dame Cathedral. Some samples displayed Pb isotopic signatures that may coincide with those of dust from the Notre-Dame Fire ( 206 Pb/ 207 Pb: 1.1669-1.1685). Finally, in 2021, another winter flood depositing a majority of subsurface material occurred. Overall, the metal contamination levels measured in the material deposited in 2021 were lower than in 2020, except for the sample collected near the Eiffel Tower. These results demonstrate the negligible impact of the Notre-Dame fire on the Pb contamination. In the future, sediment should continue to be monitored to avoid any potential mistrust from the general public, as three bathing sites have been reopened to the public in summer 2025