Historical Studies, numéro spécial de Daedalus, Journal of the American Academy of Arts and Sciences, spring 1968, issued as vol. 97, n° 2.

Baudet Jean-Pierre. Historical Studies, numéro spécial de Daedalus, Journal of the American Academy of Arts and Sciences, spring 1968, issued as vol. 97, n° 2. In: Annales de démographie historique, 1970. Migrations. pp. 393-402

Historical Studies, numéro spécial de Daedalus, Journal of the American Academy of Arts and Sciences, spring 1968, issued as vol. 97, n° 2.

Baudet Jean-Pierre. Historical Studies, numéro spécial de Daedalus, Journal of the American Academy of Arts and Sciences, spring 1968, issued as vol. 97, n° 2. In: Annales de démographie historique, 1970. Migrations. pp. 393-402

An overview of low noise devices and associated circuits for 100-200 GHz space applications

This paper relates the state of the art of the HEMT low noise technologies for the space applications at millimeter wave and specially for the earth observation in the G-band (140 – 220 GHz)).The different III-V technologies (HEMT and LNA)and their associated performance are presented.Parameters limiting the improvement of high frequency characteristics for HEMTs with the downscaling process are studied

Pore changes in an illitic clay during one-dimensional compression

International audienceThe pore size, shape and orientation of an illite-dominant clay were mapped during one-dimensional compression, using mercury intrusion porosimetry (MIP), scanning electron microscopy and gas adsorption. The total porosity was found to spread over the three International Union of Pure and Applied Chemistry classes of pores sizes: micropores (below 2 nm), mesopores (2–50 nm) and macropores (above 50 nm), and all three pore classes were observed during the compression. The clay structure is aggregated, with visible inter-aggregate pores (about 80% of the total porosity), and the remaining intra-aggregate pores of size approximately equal to the thickness of illite platelets (50–100 layers). During compression the largest pores first collapsed, followed by a progressive collapse, in an orderly manner, of smaller and smaller pores. MIP data suggest that the macroscopic deformation mainly translates at the pore scale into changes of inter-aggregate porosity, while intra-aggregate pores spread over the micro- to mesopore size range. Gas adsorption tests show that the volume of intra-aggregate pores decreases with loading, probably due to rearrangement of particles composing the aggregates, while the specific surface area reduces. Examination of the pores’ orientation on both vertical and horizontal planes confirms a preferential orientation of pores normal to the loading direction, with a gradual flattening of the pores

Indoor Carbon Dioxide, Fine Particulate Matter and Total Volatile Organic Compounds in Private Healthcare and Elderly Care Facilities

Poor indoor air quality can have adverse effects on human health, especially in susceptible populations. The aim of this study was to measure the concentrations of dioxide carbon (CO2), fine particulate matter (PM2.5) and total volatile organic compounds (TVOCs) in situ in private healthcare and elderly care facilities. These pollutants were continuously measured in two rooms of six private healthcare facilities (general practitioner’s offices, dental offices and pharmacies) and four elderly care facilities (nursing homes) in two French urban areas during two seasons: summer and winter. The mean CO2 concentrations ranged from 764 ± 443 ppm in dental offices to 624 ± 198 ppm in elderly care facilities. The mean PM2.5 concentrations ranged from 13.4 ± 14.4 µg/m3 in dental offices to 5.7 ± 4.8 µg/m3 in general practitioner offices. The mean TVOC concentrations ranged from 700 ± 641 ppb in dental offices to 143 ± 239 ppb in general practitioner offices. Dental offices presented higher levels of indoor air pollutants, associated with the dental activities. Increasing the ventilation of these facilities by opening a window is probably an appropriate method for reducing pollutant concentrations and maintaining good indoor air quality

Quantitative Health Risk Assessment of the Chronic Inhalation of Chemical Compounds in Healthcare and Elderly Care Facilities

International audiencePrevious studies have described the chemical pollution in indoor air of healthcare and care facilities. From these studies, the main objective of this work was to conduct a quantitative health risk assessment of the chronic inhalation of chemical compounds by workers in healthcare and elderly care facilities (hospitals, dental and general practitioner offices, pharmacies and nursing homes). The molecules of interest were 36 volatile and 13 semi-volatile organic compounds. Several professional exposure scenarios were developed in these facilities. The likelihood and severity of side effects that could occur were assessed by calculating the hazard quotient for deterministic effects, and the excess lifetime cancer risk for stochastic effects. No hazard quotient was greater than 1. Three compounds had a hazard quotient above 0.1: 2-ethyl-1-hexanol in dental and general practitioner offices, ethylbenzene and acetone in dental offices. Only formaldehyde presented an excess lifetime cancer risk greater than 1 × 10−5 in dental and general practitioner offices (maximum value of 3.8 × 10−5 for general practitioners). The health risk for chronic inhalation of most compounds investigated did not appear to be of concern. Some values tend to approach the acceptability thresholds justifying a reflection on the implementation of corrective actions such as the installation of ventilation systems

La maladie de la hyène : Etude comparative d'une atteinte à l'aide de deux genisses monozygotes

peer reviewe

La qualité de l’air intérieur des structures médico-sociales et libérales

International audienceLa qualité de l’air intérieur est à ce jour encore peu étudiée. Via le projet MEDIQAI, deux campagnes de prélèvements et mesures (été 2018 et hiver 2019) ont été menées à Rennes et Nancy, dans six structures libérales et quatre établissements médico-sociaux. Les concentrations médianes de composés chimiques les plus élevées ont été mesurées pour les alcools issus des activités de soins, et plus particulièrement des solutions hydroalcooliques et désinfectantes. Résultat : l’air intérieur analysé contient un mélange complexe de nombreux polluants, avec des concentrations plus élevées que dans l’air intérieur des centres hospitaliers