940 resultados para occupation tailoring


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In this article, we explore the possibility of modifying the silicon nanocrystal areal density in SiOx single layers, while keeping constant their size. For this purpose, a set of SiOx monolayers with controlled thickness between two thick SiO2 layers has been fabricated, for four different compositions (x=1, 1.25, 1.5, or 1.75). The structural properties of the SiO x single layers have been analyzed by transmission electron microscopy (TEM) in planar view geometry. Energy-filtered TEM images revealed an almost constant Si-cluster size and a slight increase in the cluster areal density as the silicon content increases in the layers, while high resolution TEM images show that the size of the Si crystalline precipitates largely decreases as the SiO x stoichiometry approaches that of SiO2. The crystalline fraction was evaluated by combining the results from both techniques, finding a crystallinity reduction from 75% to 40%, for x = 1 and 1.75, respectively. Complementary photoluminescence measurements corroborate the precipitation of Si-nanocrystals with excellent emission properties for layers with the largest amount of excess silicon. The integrated emission from the nanoaggregates perfectly scales with their crystalline state, with no detectable emission for crystalline fractions below 40%. The combination of the structural and luminescence observations suggests that small Si precipitates are submitted to a higher compressive local stress applied by the SiO2 matrix that could inhibit the phase separation and, in turn, promotes the creation of nonradiative paths.

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[Table des matières] 1. Pourquoi s'intéresser à l'occupation inappropriée des lits de soins aigus au CHUV ?. - 1.1. Etat des lieux. - 1.1.1. Les chiffres du CHUV. - 1.1.2. La cellule de gestion des flux de patients. - 1.1.3. L'unité de patients en attente de placement. - 1.1.4. La pénurie de lits dans les EMS vaudois. - 1.1.5. Le vieillissement de la population vaudoise. - 1.2. Evidences nationales et internationales. - - 2. Estimation des coûts. - 2.1. Coûts chiffrables. - 2.1.1. Perte financière directe. - 2.1.2. Coûts des transferts pour engorgement. - 2.1.3. Coût d'opportunité. - 2.2. Coûts non chiffrables. - 2.2.1. Patients. - 2.2.2. Personnel médical. - 2.2.3. CHUV. - - 3. Propositions. - 3.1. Prises en charge alternatives. - 3.1.1. Les réseaux intégrés de services aux personnes âgées. - 3.1.2. Les courts séjours gériatriques. - 3.1.3. Autres solutions. - 3.2. Prévention. - 3.2.1. Prévention des chutes. - 3.2.2. La prévention par l'information aux personnes âgées. - 3.2.3. La prévention par l'information à l'ensemble de la population

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1919/05/04 (N18).

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1919/03/16 (N11).

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1919/01/26 (N4).

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1919/01/12 (N2).

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1919/02/16 (N7).

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1919/04/13 (N15).

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1919/03/23 (N12).

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1919/04/27 (N17).

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1919/01/19 (N3).