2,497 research outputs found
Mr Alain Elkann Author and Journalist Italian Republic
No full textVisit by Mr Alain Elkann Author and Journalist Italian Republi
Grafting luminescent metal-organic species into mesoporous MCM-41 silica from europium(III)tetramethylheptanedionate, Eu(thd)3
No full textMixed systems with Eu(III) β-diketonates as optically active guest species, and mesoporous silicas MCM-41 as a host matrix have been investigated. The grafting of europium(III) onto the inner walls of unmodified MCM-41 has been achieved starting from Eu(thd)3 (thd = 2,2,6,6- tetramethyl-3,5-heptanedionate), using two routes: wet impregnation (WI) at room temperature,and chemical vapour infiltration (CVI) at 185 °C. In received hybrids, denoted Eu(thd)x@MCM- 41, the same maximum yield [Eu]/[Si] = 8.2 at% on average has been achieved with either methods. The molar ratio x = [thd]/[Eu] is 0.6 on average for WI samples, and 1.5 for CVI samples. In the latter, higher contents in thd compensate lower contents in silanols with respect to the former. Rationalizing the possible bonds exchanged at the silica surface leads to a great diversity of possible co-ordination schemes according to the expression Σ[Si(OH)nx (O)xEu(thd)3-x] (where Σ means that surface species are considered). Chromophore neutral ligands phenanthroline (phen) or bipyridine (bipy) have been added to induce efficient Eu3+ luminescence under 270–280 nm excitation, via the antenna effect. For the most favourable case, (phen)yEu(thd)x@MCM-41, the emission intensity at 612 nm under excitation at 270 nm is 2/3 that for the genuine heteroleptic complex Eu(thd)3(phen). Moreover the hybrid material is stable up to 440 °C
Les plasmas thermiques
No full textInternational audienceP. 9. Préface / Alix GicquelP. 11. Introduction : le réseau Plasmas froids et la Mission des Ressources et Compétences Technologiques du CNRS / Gérard Lelièvre, Françoise Massines et Elodie Girard I - Génération et dissipation d'énergie P. 17. I-1. Absorbtion et dissipation d'énergie dans un plasma hors équilibre / J.-P. Bœuf P. 49. I-2. Plasmas hors-équilibre à des pressions atmosphériques / K. Hassouni, F. Massines, J.-M. Pouvesle P. 109. I-3. Les plasmas thermiques / A. Gleizes II - Accès aux caractéristiques et aux espèces du plasma P. 141. II-1. Le plasma d'arc dans le procédé de projection thermique / J.-F. Couderc P. 159. II-2. Mesures de sondes électrostatiques en plasma basse pression / S. Béchu P. 225. II-3. Diagnostics laser et spectroscopie de masse dans les plasmas réactifs / J. Jolly P. 255. II-4. Saturation optique et autres pièges en spectroscopie laser / N. Sadeghi P. 275. II-5. Pièges en spectroscopie de masse / A. Granier P. 297. II-6. Source d'ionisation par micro pointes pour la spectroscopie de masse spatiale / F. Cipriani, J.-M. Illiano, J.-J. Berthelier III - Technologie des réacteurs à plasmas P. 323. III-1. Plasmas micro-onde basses pressions excités à la résonance cyclotronique électronique / Y. Arnal P. 353. III-2. Technologie des réacteur à plasma: Dimensionnement des réacteurs à Plasma micro-onde haute pression / F. Sylva, G. Hagelaar, K. Hassouni, A. Gicquel P. 367. III-3. Technologie des réacteurs à plasmas: Plasmas inductifs et capacitifs en basse pression / Ph. Lefaucheux P. 391. III-4. Les Plasmas thermique / C. Verdy, R. Boblot, H. Deng, P. Gougeon, C. Codde
Les plasmas thermiques
No full textInternational audienceP. 9. Préface / Alix GicquelP. 11. Introduction : le réseau Plasmas froids et la Mission des Ressources et Compétences Technologiques du CNRS / Gérard Lelièvre, Françoise Massines et Elodie Girard I - Génération et dissipation d'énergie P. 17. I-1. Absorbtion et dissipation d'énergie dans un plasma hors équilibre / J.-P. Bœuf P. 49. I-2. Plasmas hors-équilibre à des pressions atmosphériques / K. Hassouni, F. Massines, J.-M. Pouvesle P. 109. I-3. Les plasmas thermiques / A. Gleizes II - Accès aux caractéristiques et aux espèces du plasma P. 141. II-1. Le plasma d'arc dans le procédé de projection thermique / J.-F. Couderc P. 159. II-2. Mesures de sondes électrostatiques en plasma basse pression / S. Béchu P. 225. II-3. Diagnostics laser et spectroscopie de masse dans les plasmas réactifs / J. Jolly P. 255. II-4. Saturation optique et autres pièges en spectroscopie laser / N. Sadeghi P. 275. II-5. Pièges en spectroscopie de masse / A. Granier P. 297. II-6. Source d'ionisation par micro pointes pour la spectroscopie de masse spatiale / F. Cipriani, J.-M. Illiano, J.-J. Berthelier III - Technologie des réacteurs à plasmas P. 323. III-1. Plasmas micro-onde basses pressions excités à la résonance cyclotronique électronique / Y. Arnal P. 353. III-2. Technologie des réacteur à plasma: Dimensionnement des réacteurs à Plasma micro-onde haute pression / F. Sylva, G. Hagelaar, K. Hassouni, A. Gicquel P. 367. III-3. Technologie des réacteurs à plasmas: Plasmas inductifs et capacitifs en basse pression / Ph. Lefaucheux P. 391. III-4. Les Plasmas thermique / C. Verdy, R. Boblot, H. Deng, P. Gougeon, C. Codde
Résister à la normalisation des conduites : Entretien avec Roland Gori, propos recueillis par Alain Policar
No full textCo-initiator of the call of calls denouncing the ideology of a neuroeconomic man in whose name the current reforms break and redial our jobs and tasks of care, social works, education, research, justice, information and culture, the author analyzes mainly the psychiatric knowledge and practice as facts of civilization.Co-initiateur de l'Appel des appels qui dénonce l'idéologie d'un «homme économique» au nom de laquelle les réformes actuelles défont et recomposent les métiers et les missions du soin, du travail social, de l'éducation, de la recherche, de la justice, de l'information et de la culture, l'auteur analyse ici principalement les savoirs et les pratiques psychiatriques comme «des faits de civilisation».Policar Alain, Gori Roland. Résister à la normalisation des conduites : Entretien avec Roland Gori, propos recueillis par Alain Policar. In: Raison présente, n°171, 3e trimestre 2009. Savoir, connaitre, agir. pp. 87-94
Alain de Lille
No full textAlain de Lille (c. 1128-1202) was a French monk and the author of the very popular and influential Ars Praedicandi (Art of Preaching).https://mds.marshall.edu/sermonstudies_gallery/1001/thumbnail.jp
The biocompatibility of titanium in a buffer solution: compared effects of a thin film of TiO2 deposited by MOCVD and of collagen deposited from a gel
No full textThis study aims at evaluating the biocompatibility of titanium surfaces modified according two different ways: (i) deposition of a bio-inert, thin film of rutile TiO2 by chemical vapour deposition (MOCVD), and (ii) biochemical treatment with collagen gel, in order to obtain a bio-interactive coating. Behind the comparison is the idea that either the bio-inert or the bio-active coating has specific advantages when applied to implant treatment, such as the low price of the collagen treatment for instance. The stability in buffer solution was evaluated by open circuit potential (OCP) for medium time and cyclic voltametry. The OCP stabilized after 5104 min for all the specimens except the collagen treated sample which presented a stable OCP from the first minutes. MOCVD treated samples stabilized to more electropositive values. Numeric results were statistically analysed to obtain the regression equations for long time predictable evolution. The corrosion parameters determined from cyclic curves revealed that the MOCVD treatment is an efficient way to improve corrosion resistance. Human dermal fibroblasts were selected for cell culture tests, taking into account that these cells are present in all bio-interfaces, being the main cellular type of connective tissue. The cells grew on either type of surface without phenotype modification. From the reduction of yellow, water-soluble 3-(4,5-dimethyldiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT cytotoxicity test), MOCVD treated samples offer better viability than mechanically polished Ti and collagen treated samples as well. Cell spreading, as evaluated from microscope images processed by the program Sigma Scan, showed also enhancement upon surface modification. Depending on the experimental conditions, MOCVD deposited TiO2 exhibits different nanostructures that may influence biological behaviour. The results demonstrate the capacity of integration in simulated physiologic liquids for an implant pretreated by either method
MOCVD-Fabricated TiO2 Thin Films: Influence of Growth Conditions on Fibroblast Cells Culture
No full textTiO2 thin films with various morphologies were grown on Ti substrates by the LP-MOCVD technique (Low Pressure Chemical Vapour Deposition from Metal-Organic precursor), with titanium tetra-iso-propoxide as a precursor. All the films were prepared in the same conditions except the deposition time. They were characterized by X-ray diffraction, scanning electron microscopy, optical 15 interferometry, water contact angle measurements. MOCVD-fabricated TiO2 thin films are known to be adapted to cell culture for implant requirements. Human gingival fibroblasts were cultured on the various TiO2 deposits. Differences in cell viability (MTT tests) and cell spreading (qualitative assessment) were observed and related to film roughness, wettability and allotropic composition
From knowledge to skills: training for transition jobs. Interview with Alain Grandjean
No full textInternational audienceAlain Grandjean is an economist and author specializing on green finance. He is also cofounder and partner of Carbone 4, a consultancy firm focusing on energy transition and adaptation to climate change. The interview first revolves around the academic content Alain Grandjean considers as the bare necessities to be taught in higher education, no matter the curriculum. This should take the form of a basic synthetic training which takes into account the major environmental issues without too much technicality as well as lessons in accounting and economics, which he considers essential. The interview also looks more specifically at engineering and business schools. Then Alain Grandjean shares his views on the effectiveness of different ways to engage for the transition -like radical individual lifestyle transformations and civil disobiedience. He also evokes the roles that trade unions as well as NGOS can play and he talks about collapsology
Justice et politique (24) - face A
No full textSéminaire dirigé par Alain Bancaud, Anne Boigeol, Henry Rousso et Francine Soubiran-Paillet. Enregistré à l'IHTP (Paris), entre 1995 et1998
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