Portail HAL UHA (Université de Haute-Alsace)
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Co-organisation du colloque « Textiles and the Texture of Ideas in Early Modern Europe (1589-1801) : How the Craft and its Products Interacted with Philosophy, Literature and the Visual Arts »
No full textInternational audienceThe aim of the conference is to explore aspects of the interactions between textile manufacturing and its products and the individual or collective imagination, intellectual life as well as the “world picture” and mental representations in the early modern period
"Car des Grezois ne des Romains / ne dit an mes ne plus ne mains" : translatio, renommée et mémoire dans Cligès de Chrétien de Troyes
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Influence of cation nature on high pressure intrusion of aqueous salt solutions in pure silica MFI-type zeolite
No full textInternational audienceHigh pressure intrusion-extrusion of water and aqueous salt solutions in hydrophobic porous solids such as pure silica zeolites (zeosils) is a promising way to absorb and store mech. energy. The intrusion pressure has already been shown to be increased with salt concentration, but the influence of cation nature is not yet fully understood. The intrusion-extrusion experiments of aqueous chloride solutions of alkali, alk.-earth and transition metals (MCln, where Mn+ = Li+, Na+, K+, Rb+, Cs+, Ca2+, Mg2+, Sr2+, Al3+, Mn2+, Ni2+ Co2+, Cu2+, Zn2+, Cd2+) in MFI-type zeosil (silicalite-1) have been performed to study this effect. In contrast to the anions, the reported results indicate that the cation nature does not have a significant influence on intrusion behavior. All the systems demonstrate a spring behavior with fully reversible intrusion except the ones with highly concentrated ZnCl2 and CsCl solutions, where a small part of the liquid remains trapped in the pores in the first intrusion-extrusion cycle. At fixed H2O/salt molar ratio, a strong influence of cation nature on intrusion pressure is observed For alkali, alk.-earth metal and aluminum cations, the intrusion pressure rises with cation charge, whereas the increase of cation size leads to a pressure decrease. These trends are also in agreement with cation hydration enthalpy value for alkali and alk.-earth metal cations, but no correlation is observed for the most part of the transition metal ones except Zn and Cd
Stochastic branching models for the telomeres dynamics in a model including telomerase activity
No full textInternational audienceTelomeres are repetitive sequences of nucleotides at the end of chromosomes, whose evolution over time is intrinsically related to biological ageing. In most cells, with each cell division, telomeres shorten due to the so-called end replication problem, which can lead to replicative senescence and a variety of age-related diseases. On the other hand, in certain cells, the presence of the enzyme telomerase can lead to the lengthening of telomeres, which may delay or prevent the onset of such diseases but can also increase the risk of cancer.In this article, we propose a stochastic representation of this biological model, which takes into account multiple chromosomes per cell, the effect of telomerase, different cell types and the dependence of the distribution of telomere length on the dynamics of the process. We study theoretical properties of this model, including its long-term behaviour. In addition, we investigate numerically the impact of the model parameters on biologically relevant quantities, such as the Hayflick limit and the Malthusian parameter of the population of cells
Development of White Light-Emitting Textiles Using Inorganic Phosphor-Loaded Photopolymers for Potential Lighting Applications
No full textInternational audienceThe development of flexible textile-based lighting systems remains challenging, usually requiring the combination of light-emitting diodes (LEDs) with polymer optical fibers to achieve 2 large emission areas. However, the overall emission remains point-based, leading to possible glare issues and shadowed zones. In this context, the present work proposes the development of light-emitting textiles that uniformly distribute white light when excited by a blue LED source. Simple cotton substrates were coated with a flexible photoluminescent phosphor-loaded polymer composite. The yellow and/or red phosphors were efficiently incorporated into the polymer matrix via a fast and easy-to-implement UV-induced polymerization reaction, conducted in air and in the absence of any toxic organic solvents. Under blue light, the yellow phosphor-coated textile produced cold white light but the color temperature was easily tuned to warmer nuances by adjusting the amount of red-emitting phosphor, with high color rendering indexes (>70) and luminance values over 500 cd/m². Stability and structural measurements were then carried out to assess possible scale-up options. The versatility of the polymer matrix also expanded the possible applications to 2D surface functionalization and 3D printing
Co-modified SBA-15 catalysts for waste gases purification processes - Effect of precursor
No full textInternational audienceNew data on the structural and catalytic properties of a series of mono-component cobalt and bi-component Co-Mn samples supported on SBA-15, prepared by different precursors are reported. The catalysts are characterized by SAXS, N2-physisorption, XRD, TEM, TPR, XPS, Uv-vis and FTIR methods and tested in combustion reactions of butane and n-hexane. It was established that the preparation of the Co-SBA-15 catalysts by different precursors does not significantly change the mesoporous structure. Co species are located in the mesopores, and their shrinkage occurs after the calcination to decompose of the cobalt precursor. Depending on the precursor used, different types of oxide phases are formed on the surface of the mesoporous support. Finely divided and weakly interacting with the support Co3O4 and CoSiO3 are formed on the surface of cobalt samples prepared from both precursors. In addition to the mentioned two phases finely dispersed CoO and a silica-like phase are formed on the surface of the one-component sample prepared from cobalt nitrate. The highest activity of the bi-component Co-Mn sample obtained by a mixed solution of an acetate precursor is explained by very low crystallinity of the supported metal oxide phases and their highest reducibility
Rolled-up gastroretentive gelatin rings for controlled release of riboflavin and captopril
No full textInternational audienceIn this study, we introduce a rolled-up ring-shaped gastroretentive device, which enables controlled drug release via the radial position of a drug reservoir relative to its surface. The device was formed by rolling up a gelatin film, which was initially wrapped on the surface of an acrylic cylinder. Prior to rolling, a drug reservoir was formed at a predetermined position of the wrapped film. The device containing the drug was packed within gastric-dissolvable gelatin capsule shell. Upon contact with the simulated gastric medium, the prepared capsule was dissolved and rapidly released the ring-shaped device within two minutes. The deployed system then swelled and retained its shape, before eventually disintegration within 24 hours. The disintegration process can be accelerated, if necessary, via the design of "weak points" in the ring's structure, allowing for safe and programmed evacuation through the lower gastrointestinal tract. The rolled-up ring-shaped devices, containing riboflavin or captopril, allowed to control the release rates by the radial position of the drug reservoirs. The developed expandable gastroretentive device presents a promising solution for reducing daily dosages and enhancing personalized treatment
Pyrolysis of a single wood pellet between 600 and 1000 °C under high heating rates in a drop tube furnace: Experiments and modeling
No full textInternational audienceEurope is aiming for carbon neutrality by 2050 and has established a 55% reduction in net greenhouse gas emissions by 2030, in line with the European Climate Law (2021). Oxy-fuel combustion through chemical looping combustion (CLC) is a promising technique for decarbonizing industrial processes generating hard-to-abate CO₂ emissions. By using biomass, Bio-CLC goes further and achieves negative CO 2 emissions. CONTEXT Metal oxydation reactorCombustion reactor</div
Promoting physical activity and limiting sedentary behaviors to manage pain in endometriosis: What are the psychosocial variables to take into account?
No full textInternational audienceEndometriosis is negatively linked to physical activity (PA), as its symptoms and psychosocial barriers may hinder participation. This study compared PA, sedentary behavior (SED), and psychosocial variables in women with and without endometriosis. Women with endometriosis reported lower SED, poorer quality of life (QoL), greater kinesiophobia, health-related barriers, lower physical self-concepts, and negative PA-related stereotypes. In both groups, PA levels were associated with previous PA behavior and intention. In endometriosis, PA and SED correlated with health barriers, motivational variables, risk beliefs, self-concepts, and QoL. Findings highlight the importance of motivational variables and self-concepts to support PA engagement and improve QoL