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La qualité de l’air intérieur dans les écoles fait l’objet d’une attention particulière grandissante. En effet, l’école et les lieux d’accueil d’enfants (crèches, garderies) sont, après le logement, les environnements les plus fréquentés par les enfants qui représentent l’un des publics les plus sensibles à la pollution atmosphérique. Leur organisme en croissance est plus fragile à l’action des polluants...
The nanocrystalline powders of Y 4 Al 2 O 9 single doped with Nd 3+ , Yb 3+ , Er 3+ and co-doped with Nd 3+ and Yb 3+ as well as with Yb 3+ and Er 3+ were obtained by a modified sol-gel method starting from nitrates and acetates rather than citrates. The powders were characterised by X-ray diffraction method, high resolution...
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