Dynamic stratification in drying films of colloidal mixtures

In simulations and experiments, we study the drying of films containing mixtures of large and small colloidal particles in water. During drying, the mixture stratifies into a layer of the larger particles at the bottom with a layer of the smaller particles on top. We developed a model to show that a gradient in osmotic pressure, which develops dynamically during drying, is responsible for the segregation mechanism behind stratification

Le Touar, Les Arcs-sur-Argens (Var). Note complémentaire.

As an addendum to their article published in the DAM 12 (1989), the authors give two sets of results of radiocarbon dating of Late Bronze II/IIIa and Early Iron Age lewels. The chronological margins obtained tend to push the beginning of the Iron Age in the Provence back to a much earlier date.En complément de leur article paru dans les DAM 12 (1989), les auteurs donnent deux datations obtenues par analyse de radio-carbone dans des niveaux du Bronze final II/IIIa et du premier Age du fer. Les fourchettes chronologiques obtenues tendent à vieillir de façon sensible le début de l'Age du fer provençal.Bérato Jacques, Magnin Frédéric, Dugas Franck. Le Touar, Les Arcs-sur-Argens (Var). Note complémentaire.. In: Documents d'Archéologie Méridionale, vol. 13, 1990. pp. 249-251

Les tombes protohistoriques de Gros-Ped, Les Arcs-sur-Argens (Var)

The accidental discovery of two cremations burial places in the central Var department has revived the knowledge of the funeral practices of the Early Iron Age in this region. The well-preserved burial places are presented in their structural lay-out (in plain earth, whitout any particular protection or marking) and ritual arrangement (bones collected from the pyre, relation to the personal objects of the deceased, accompanying offerings or libations). Besides pottery, part of which is finely decorated, some metal or bone objects (ornaments, arms, plaques) strike us because of their technical quality and their close relation to the products of the Hallstatt cultures in the Northern Alps. Lastly, a built-up ustrinum has been excavated. The burial places can be to dated to the VIth c. ; the cremation area, however, is somewhat more recent (between the end of the VIth and the end of the Vth c. B.C.).La découverte fortuite de deux sépultures à incinération, au centre du département du Var, vient de relancer la connaissance du milieu funéraire du premier Age du fer dans cette région. Les sépultures, bien conservées, sont présentées dans leurs dispositions structurelles (en pleine terre, sans protection et signalisation particulières) et rituelles (ossements recueillis sur le bûcher, rapport avec les objets personnels des défunts, offrandes d'accompagnement ou de libation). Outre un mobilier céramique dont quelques exemplaires sont finement décorés, ce sont les objets métalliques ou en os (parure, armement, tabletterie) qui retiennent toute l'attention pour leur qualité technique et leur rapport étroit avec les productions des cultures hallstattiennes nord-alpines. Enfin, un ustrinum aménagé a été fouillé. Les sépultures sont du VIe s., la zone de crémation, quant à elle, est un peu plus tardive (entre la fin du VIe et la fin du Ve s. av. J.-C).Bérato Jacques, Dugas Franck, Dutour Olivier. Les tombes protohistoriques de Gros-Ped, Les Arcs-sur-Argens (Var). In: Documents d'Archéologie Méridionale, vol. 14, 1991. Le sanctuaire protohistorique de Roquepertuse. pp. 125-140

L'occupation protohistorique du territoire communal des Arcs-sur-Argens (Var)

Prospectings and soundings bring a knew knowledge of protohistory in the Arcs-sur-Argens village district. During the Final Bronze II it was a small dwelling place on the slope of the Colobrère forest. From the Final Bronze II/IHA (C 14/ 1400- 1030 B.C.) until the first Iron Age (C14:1013-799 B.C.), dwellings were located in the Touar plain. During the Iron Age, dwellings were then constructed on the tops of the hills. For instance, the Castel-Diol oppidum with a 3,000 m2 in area dated back to the first half of the 5th century B.C. La Cabredor, a 1,600 m2 oppidum, with a rampart. Dwellings are grouped together in rows, each one being separated from the other by narrow spaces and from the wall by an open space. This oppidum is dated back to the end of the second century and the just half first century B.C. The Castelard, a 6,200 m2 oppidum with a double rampart and a 2,800 m2 central redoubt. In a second stage of occupation dated from the middle of the 2nd century B.C., dwellings lean on the wall. The hypothesis of an ancient path permitting an access to the permian depression of the Saint-Tropez gulf is evoqued, as well as the possible causes of the shift of population from the plain to the Maures massif.Prospections et sondages apportent une connaissance nouvelle de la protohistoire dans la commune des Arcs- sur-Argens. Petit habitat de pente de la forêt de Colobrère du Bronze Final II Habitat de Plaine du Touar du Bronze Final II/IIIA (C14 : 1400-1030 av. J.-C.) et du Premier Age du Fer (C14 : 1013-799 av. J.-C). Occupation de sommet à l'Age du Fer : oppidum de Castel-Diol, muni d'un rempart, de 3 000 m2 de superficie, de la première moitié du Ve s. av. J.-C. La Cabredor, oppidum de 1 600 m2 avec rempart. Les habitations sont regroupées en rangées, séparées les unes des autres par des espaces étroits et de la courtine par une lice. Il est daté de la fin ir-première moitié du Ier s. av. J.-C. Le Castelard, oppidum de 6 200 m2, à double rempart et réduit central de 2 800 m2. Les cases s'appuient contre la courtine dans un deuxième état dont l'occupation est fixée dans le milieu du IIe s. av. J.-C. L'hypothèse d'une ancienne piste permettant d'accéder de la dépression permienne au Golfe de Saint-Tropez est évoquée, ainsi que les éventuelles causes du transfert de population de la plaine vers le Massif des Maures.Bérato Jacques, Dugas Franck, Babillaud Claude, Bérato Nicole, Lerat Dominique, Reynier Jean. L'occupation protohistorique du territoire communal des Arcs-sur-Argens (Var). In: Revue archéologique de Narbonnaise, tome 23, 1990. pp. 13-31

Saint-Antonin (Var). Chapelle Sainte-Foy

Seillé Jacques, Kraemer Jacques, Dugas Franck, Bérard Géraldine, Barbier Edmond F., Bérato Jacques. Saint-Antonin (Var). Chapelle Sainte-Foy. In: Archéologie médiévale, tome 24, 1994. p. 458

Behavior of short silica monolithic columns in high pressure gas chromatography.

International audienceIn order to analyze light hydrocarbons mixtures with silica monolithic columns, a conventional gas chromatograph was modified to work with carrier gas pressure as high as 60bar. To understand hydrodynamic flow and retention with short columns (less than 30cm), special attention was required due to the temperature difference between the oven area and the FID detector which contain a significant length of the column. Efficiency and selectivity using various carrier gases (helium, nitrogen and carbon dioxide) at different inlet pressure for different oven temperature were studied. Carrier gas nature was a very significant parameter: on one side, linked to adsorption mechanism for gases like nitrogen and carbon dioxide onto the stationary phase modifying retention and selectivity, on the other side in relation to the minimum theoretical plate height which was as low as 15μm (66 000 platem(-1)) using carbon dioxide as carrier gas. The chromatographic system was then used to separate methane, ethane, ethylene, acetylene, propane, cyclopropane, and butane in less than 30s

Behavior of macroporous vinyl silica and silica monolithic columns in high pressure gas chromatography

International audienc

Occupational prestige trajectory and the risk of lung and head and neck cancer among men and women in France

International audienceObjectives: This study aimed at investigating the associations between occupational prestige trajectories and lung and head and neck (HN) cancer risk and to assess to what extent smoking, alcohol drinking, and occupational exposures contribute to these associations.Methods: Using data from the ICARE case–control study (controls (2676 men/715 women), lung cancers (2019 men/558 women), HN cancers (1793 men/305 women), we defined occupational prestige trajectories using group-based modeling of longitudinal data. We conducted logistic regression models.Results: Among men, a gradient was observed from the downward “low to very low” trajectory to the stable very high trajectory. The associations were reduced when adjusting for tobacco and alcohol consumption and occupational exposures. Among women, when compared to the stable high trajectory, there was an increased cancer risk in all trajectories. The associations remained globally unchanged or even increased after adjustment for tobacco and alcohol consumption and did not change when adjusting for occupational exposures. The ORs were smaller for lung than for HN cancers in men.Conclusions: Occupational prestige trajectory is strongly associated with lung and HN cancer risk in men and women