Résumé. Dans cet article nous abordons le problème de la classification (ou clustering) dans le but de découvrir des classes avec recouvrements. Malgré quelques avancées récentes dans ce domaines, motivées par des besoins applicatifs importants (traitements des données multimédia par exemple), nous constatons l’absence de solutions théoriques à ce problème. Notre étude consiste alors à proposer...

Ceria-terbia solid solution nanobelts were prepared by an electrochemical route and tested as catalysts of high activity for CO oxidation.

The complete conversion of NOx to harmless N2 without N2O formation is crucial for the control air pollution, especially at low temperatures. Cu-based catalysts are promising materials due their cost and high activity in NO dissociation, even comparable noble metals; however, they suffer from stability. Here, we established a Cu-Ce catalyst one step with strong metal–support interaction by flam...

A new series of Mn-based catalysts (Mn-TiO2, Ce-Mn-TiO2, Mn-TiO2-SO42–, and Ce-Mn-TiO2-SO42–) were successfully elaborated using the sol–gel method associated with supercritical drying approach for low-temperature NO-SCR by NH3. The physicochemical properties aerogel powders examined XRD, N2-Physisorption at 77 K, NH3-TPD, H2-TPR, DRUV-Vis spectroscopy. It was shown that all develop essentially...

IntroductIon Few medical issues are as contentious as determining the most effective and the safest treatment of cough and colds in children. Parents and caregivers know that antibiotics are not useful in treating viruses that are often the cause of these ailments. [1] They have turned, therefore, to overthe-counter (OTC) medications to relieve their children’s symptoms and have found more than...