Search results for "RAV"
showing 10 items of 5866 documents
Vie d'apprentis
1994
En France, l'apprentissage a quelques difficultés à s'inscrire comme filière de formation à part entière, même si les lois récentes tentent de lui donner une place et une image positives dans le système de formation.
Les jeunes filles à la sortie du lycée
1987
International audience
Sorption Equilibria of Ethanol on Cork
2013
International audience; We report here for the first time a thermodynamic study of gaseous ethanol sorption on raw cork powder and plate. Our study aims at a better understanding of the reactivity of this material when used as a stopper under enological conditions, thus in close contact with a hydroethanolic solution, wine. Sorption−desorption isotherms were accurately measured by thermogravimetry at 298 K in a large range of relative pressures. Sorption enthalpies were determined by calorimetry as a function of loading. Sorption−desorption isotherms exhibit a hysteresis loop probably due to the swelling of the material and the absorption of ethanol. Surprisingly, the sorption enthalpy of e…
Ancienneté dans l'entreprise et progressions salariales en début de carrière
2012
Le rôle salarial de l'ancienneté dans l'entreprise est souvent supposé en déclin, compte tenu du recul des modes de rémunérations " systématiques " à l'ancienneté (appliqué à tous les salariés d'une entreprise ou à certaines catégories). Or, pour une cohorte de jeunes ayant passé sept années sur le marché du travail, près de la moitié des individus ont déclaré que dans leur entreprise " l'avancement d'un salarié dépend principalement de son ancienneté ". De plus, l'ancienneté dans l'entreprise continue à jouer un rôle déterminant pour les carrières salariales des individus déclarant des modes de rémunérations plus individualisés dans leur entreprise. L'effet salarial moyen de l'ancienneté s…
Les contextes organisationnels d'insertion des jeunes
2011
National audience; Cette recherche se propose d'examiner les liens entre les formes d'organisation du travail dans lesquelles se trouvent les jeunes et leur stabilisation professionnelle. A partir de l'enquête Génération 98 du Céreq, portant sur une cohorte de jeunes sortants du système éducatif en 1998 et enquêtés fin 2005, nous avons construit une typologie de cinq contextes organisationnels de travail utilisant des informations sur le contrôle de l'activité, sur l'autonomie des salariés ou sur le contenu cognitif du travail. Les résultats montrent que la formation initiale des jeunes, leur trajectoire professionnelle et leur accès à la formation continue sont fortement liés aux formes d'…
Comportement des entreprises et pratiques de l'administration en matière d'emploi obligatoire des travailleurs handicapés : le cas de la Côte d'Or
1986
The impact of soil erosion on soil fertility and vine vigor. A multidisciplinary approach based on field, laboratory and remote sensing approaches
2018
Soil erosion processes in vineyards, beyond surface runoff and sediment transport, have a strong effect on soil organic carbon (SOC) loss and redistribution along the slope. Variation in SOC across the landscape can determine differences in soil fertility and vine vigor. The goal of this research was to analyze the interactions among vines vigor, sediment delivery and SOC in a sloping vineyard located in Sicily. Six pedons were studied along the slope by digging 6 pits up to 60 cm depth. Soil was sampled every 10 cm and SOC, water extractable organic carbon (WEOC) and specific ultraviolet absorbance (SUVA) were analyzed. Erosion rates, detachment and deposition areas were measured by the po…
Determination of mono-, di- and trinitronaphthalenes in soil samples contaminated by explosives.
2004
We investigated the extraction of eight mono-, di- and trinitronaphthalenes from soil samples by ultrasonic, respectively, soxhlet extraction. Sonication was the more convenient procedure with a usually higher repeatability than the soxhlet method. All extracts were analysed by high-performance liquid chromatography with diode array detection. These methods were used to determine the concentration of nitronaphthalenes in five soil samples polluted by explosives. The most abundant contaminants were 1,5- and 1,8-dinitronaphthalene as well as 1,3,5-, 1,3,8- and 1,4,5-trinitronaphthalene. In all samples the sum of trinitronaphthalenes exceeded the sum of mono- and dinitronaphthalenes. It is rec…
Specific detection of cyclobutane pyrimidine dimers in phytoplankton DNA by a non-radioactive assay based on T4-endonuclease V digestion.
2001
The effect of artificial and natural UV irradiation on DNA in marine phytoplankton Isochrysis galbana monoculture was investigated. The presence of cyclobutane pyrimidine dimers (CPDs) in unlabelled I. galbana DNA was detected by a non-radiometric alkaline filter elution assay after T4-endonuclease V digestion. The quantity of CPDs was estimated by alkaline agarose gel electrophoresis. Precise determination of the amount of DNA in the presence of I. galbana pigments was achieved by oxazole yellow homodimer (YOYO) dye. T4-endonuclease V-sensitive sites frequency (ESS/kb), measured after exposure to 2-40 kJ m(-2) of artificial UV light, increased in a dose-dependent manner. Twelve hours after…
Monitoring WWTP performance using size-exclusion chromatography with simultaneous UV and fluorescence detection to track recalcitrant wastewater frac…
2018
Abstract A trial monitoring of a typical full-scale municipal WWTP in Central Finland was aimed to explore applicability of high performance liquid chromatography – size exclusion chromatography (HPSEC) with simultaneous UV and fluorescence detection as a tool for advanced routine monitoring of wastewater treatment. High, intermediate, and low molecular weight (MW) fractions of untreated wastewater (influent) and treated wastewater (secondary effluent) were characterized in terms of UV absorbance at 254 nm (UVA254) and specific fluorescence representing tyrosine-like, tryptophan-like, and humic/fulvic-like compounds. The activated sludge treatment removed 97 ± 1% of BOD, 93 ± 2% of COD, 71 …