Portail HAL UHA (Université de Haute-Alsace)
Not a member yet
17715 research outputs found
Sort by
Identification et caractérisation de carbones quantum dots dans la fraction nanométrique des PM1 présentes dans les fumées issues de la combustion du bois
No full textInternational audienc
Continuous hydrogen production from a swirled-stabilized aluminum flame
No full textInternational audienc
Highly efficient one-pot synthesis of polyesteramides from ɛ-caprolactone and l-phenylalanine with high cell-viability and chemical stability
No full textInternational audienceBiocompatible materials have greatly expanded the engineering possibilities for both disease treatment and overall health care. An outstanding family of such biomaterials is poly(ester amide) (PEA), which has proliferated incredibly in the past decades. Herein, we report the synthesis of a new series of PEAs derived from ɛ-caprolactone (CL) and l-phenylalanine (L-Phe) by melt polycondensation with a wide range of molar compositions. Their structure is investigated in the light of in-depth infrared spectroscopy and nuclear magnetic resonance analyses. The resulting copolymers are completely amorphous for (CL) contents lower than 80 %, while copolymers with (CL) composition above 80 % are semi-crystalline. Furthermore, these copolymers have an excellent thermal stability and a glass transition temperature (Tg) that increases with the amino acid content, reaching 47 °C. More importantly, they were found to be non-cytotoxic, with high cell-viability and chemically stable under hydrolytic and oxidative conditions, opening up the possibility for developing materials suitable for biomedical applications, particularly as drug delivery systems
Pulsed laser photopolymerization: Kinetics, modeling and application in holography
No full textInternational audienc
Wetting of Silicone Oil Drops and Air Bubbles in Ethylene Glycol/Water Mixtures
No full textInternational audienceContact angles of silicone oil droplets and air bubbles settled on a solid substrate and confined in binary ethylene glycol/water mixtures were studied as a function of ethylene glycol concentration. Despite similar reductions in interfacial tensions for both systems, distinct wetting behaviors were observed. While the air bubble contact angle increased with ethylene glycol concentration, the silicone oil droplet exhibited a more complex response, characterized by a stable contact angle at low ethylene glycol concentrations followed by an increase at higher concentrations. This suggests that droplet morphology can remain relatively stable even as interfacial tensions change. A phenomenological description based on the imbalanced forces highlights the crucial role of the contact angle in pure water environment, in predicting the wetting behavior that may follow the reduction of interfacial tension by further surfactant or cosolvent adsorption.</div
On absolutely continuous curves in the Wasserstein space over R and their representation by an optimal Markov process
No full textLet µ = (µt)t∈R be a 1-parameter family of probability measures on R. In [11] we introduced its “Markov-quantile”process: a process X= (Xt)t∈R that resembles as much as possible the quantile process attached to µ, among the Markov processesattached to µ, i.e. whose family of marginal laws is µ.In this article we look at the case where µ is absolutely continuous in the Wasserstein space P2(R). Then X is solution of adynamical transport problem with marginals (µt)t. It provides a Markov minimal Lagrangian probabilistic representative of µ, whichis moreover unique among the processes obtained as certain types of limits: limits for the finite dimensional topology of quantileprocesses where the past is made independent of the future conditionally on the present at finitely many times, or limits of processeslinearly interpolating µ.This raises new questions about ways to obtain Markov Lagrangian representatives, and to seek uniqueness properties in thisframework.Soit µ = (µt)t∈R une famille à un paramètre de mesures de probabilité sur R. Dans [11] nous introduisons le processus“Markov-quantile” qui lui est attaché: c’est le processus X= (Xt)t∈R qui ressemble le plus qu’il est possible au processus quantileassocié à µ, parmi les processus markoviens associés à µ, c’est-à-dire dont la famille de marges est µ.Dans cet article nous considérons le cas où µ est absolument continue dans l’espace de Wasserstein P2(R). Alors X est solutiond’un problème de transport dynamique, de marges (µt)t. Il fournit un représentant probabiliste lagrangien minimal markovien de µ.Il est en outre unique parmi les processus obtenus comme certains types de limites : limites pour la topologie de dimension finie deprocessus quantiles dont le passé est rendu indépendant du futur, conditionnellement au présent, en un nombre fini d’instants, ou limitesde processus interpolant linéairement µ.Ceci soulève de nouvelles questions sur les manières d’obtenir des représentants lagrangiens markoviens, et de demander despropriétés d’unicité dans ce cadre
Recent Advances in Heterogenization of Photocatalysts on Polymer Supports and Applications in Organic Synthesis
No full textInternational audienceThe photocatalysis is a powerful tool in organic synthesis to generate reactive intermediates and create challenging chemical bonds. The reactivity on such process is mainly controlled by a photocatalyst (PCat) which is designed to ensure both selectivity and efficiency. In the pursuit of more economical and environmentally friendly approaches, the heterogenization of photocatalysts has become increasingly essential, and it is still challenging. Among the various insoluble supports studied, polymers offer several appealing characteristics, such as stability, ease of synthesis, porosity, and recyclability. This review aims to summarize the recent progress in heterogenization of photocatalyst on polymer including the polymerization of PCat, post‐grafting of PCat and 3D‐printing. For the selected heterogeneous photocatalyst, examples of organic transformations and evidence of photocatalytic efficiency will be discussed
Les perspectives hétérotopiques offertes par Tituba, sorcière de Salem
No full textInternational audienceBorn in the 17th century from a rape that occurred aboard a slave ship coming from the African coast to Barbados, initiated into the supernatural and the virtues of plants, potions and ointments by the old lady who took her in, the slave Tituba was associated with what was considered the worst of feminine representations: the witch. Her story, reconstructed through the imagination of Maryse Condé in a novel published in 1986, allows us to observe the interstices of freedom that the heroine constructs notwithstanding the counter-spaces constituted by societies that reject what they ignore. The ship, "heterotopia par excellence" (Foucault, 1966), the colony and the voyage allow us to examine the constant deviations that societies would like to hide or make disappear but for which they choose to blame the individuals they consider to be in crisis and who resist it. Through the heterotopic perspectives offered throughout Tituba's journey, we will see how the "witchcraft" of the character liberates the female figure and manages to demonstrate the "undefeated power of women" (Chollet, 2018)Née au 17ème siècle d’un viol survenu à bord d’un bateau négrier en provenance des côtes africaines vers la Barbade, initiée au surnaturel et aux vertus des plantes, des potions et des onguents par la vieille dame qui la recueille, l’esclave Tituba a été associée à ce qui était considéré comme la pire des représentations féminines : la sorcière. Son histoire, reconstituée à travers l’imaginaire de Maryse Condé dans un roman paru en 1986, permet d’observer les interstices de liberté que l’héroïne construit nonobstant les contre-espaces constitués par les sociétés qui rejettent ce qu’elles méconnaissent. Le bateau, « hétérotopie par excellence » (Foucault, 1966), la colonie et le voyage permettent d’examiner les déviations constantes que les sociétés voudraient dissimuler ou faire disparaître mais dont elles choisissent de faire porter la responsabilité aux individus qu’elles considèrent en crise et qui lui résistent. À travers les perspectives hétérotopiques offertes tout au long du parcours de Tituba, nous verrons comment la « sorciérisation » du personnage affranchit la figure féminine et parvient à démontrer la « puissance invaincue de la femme » (Chollet, 2018)
Color–polarization filter array image demosaicing: linear minimum mean squared error augmented by anisotropic diffusion
No full textInternational audienc
Welcoming the Consumer: a Semiotic Exploration of Coffee Shop Entrances
No full textInternational audienc