Impact of electron-hole correlations on the 1T-TiSe21T\text{-}{\mathrm{TiSe}}_{2} electronic structure

Several experiments have been performed on 1T−TiSe2 in order to identify whether the electronic structure is semimetallic or semiconducting without reaching a consensus. In this Letter, we theoretically study the impact of electron-hole and electron-phonon correlations on the bare semimetallic and semiconducting electronic structure. The resulting electron spectral functions provide a direct comparison of both cases and demonstrate that 1T−TiSe2 is of predominant semiconducting character with some spectral weight crossing the Fermi level

L'analyse interprétative de l'utilisation du matériel pédagogique par des enseignants du primaire en classe multiâge

Cet article présente les résultats d’une recherche menée auprès d’enseignants titulaires de classes multiâges de la région du Saguenay-Lac-Saint-Jean. Il présente un nouveau regard sur l’utilisation du matériel pédagogique qui se fait dans le contexte spécifique de la classe multiâge (CMA). La collecte de données s’est déroulée sur un an, en deux étapes. Au printemps 2008, un questionnaire a été distribué à tous les enseignants en CMA du Saguenay-Lac-Saint-Jean. Puis, durant l’automne 2008, six enseignants ont été sélectionnés pour participer à des entrevues semi-dirigées. Cet article présente les résultats de la collecte de données, ainsi que l’interprétation qui en découle. De façon générale, nous retenons de cette étude que l’utilisation du matériel pédagogique est loin d’être évidente en CMA. Les enseignants en CMA s’entendent sur le fait qu’il faut, lorsque c’est possible, utiliser un seul matériel pédagogique pour les différents degrés de la classe afin d’éviter le doublement de la tâche. Malgré cette intention, les spécificités de chaque discipline et le rapport aux savoirs qui s’y exerce influencent indirectement les choix de matériel pédagogique que font les enseignants en CMA

Active and passive screening for tuberculosis in Vaud Canton, Switzerland.

This retrospective study compared the bacteriological and clinical presentation of tuberculosis and the outcome of treatment in immigrants notified for TB after active screening by chest X-ray at the border with other patients detected by passive screening. Retrospective study of all patients notified for TB in Vaud Canton in 2001 and 2002. In Vaud Canton 78% of the 179 patients notified for TB were foreign-born. Among 71 asylum seekers actively screened at the border, 49.3% [CI 37.4-61.2] were symptom-free vs 17.6% [CI 10.3-24.9] among 108 passively screened patients. In the passively screened group, the proportion of asymptomatic patients was 15.4% for Swiss patients, 8.6% for foreign workers, and 29.4% for other foreigners. The average duration of symptoms before diagnosis among patients with complaints was 2 months in actively screened foreign-born, compared to 2.5 months in passively screened patients (no significant difference by Wilcoxon-Mann-Whitney test). The proportion of pulmonary TB cases with positive smear or culture was 63.4% in actively screened patients vs 70.4% in passively detected cases. Among actively screened patients with bacteriological confirmation, 42.2% [CI 27.2-57.2] were asymptomatic compared to 13% [CI 5.31-20.7] for passively screened patients. Considering only smear positive patients, the proportion of symptom-free patients was 22.2% [CI 9.6-34.8] in 45 actively screened cases vs 11.7% [4.4-19.0] for 77 passive screening. Cure and treatment completion rate for new cases reached 88% for foreign workers, 83% for asylum seekers, 85% for Swiss patients, and 78% for other foreigners. Actively screened patients were more frequently asymptomatic than passively detected cases, even when considering only patients with bacteriological confirmation. The active screening by chest X-ray of an immigrant population with a high prevalence of tuberculosis allows the early detection and treatment of tuberculosis. This may contribute to the protection of the resident population from infection. The outcome of treatment for tuberculosis was satisfactory in all population groups