Dégradation du Triphénylméthane par les procédés Fenton et Photo-Fenton

La production des colorant et leur utilisation génère des effluents persistants, bio réfractaires, non biodégradables, fortement colorés, toxiques, cancérogènes, mutagènes. Les techniques traditionnelles du traitement de ces effluents qu’elles soient physico-chimiques ou biologiques sont non performantes en raison de la grande part des noyaux aromatiques présents dans les molécules des colorants et la stabilité de colorant modernes, elles demeurent non- destructives et transférants la pollution aquatique à une autre phase provoquant une pollution secondaire. Pour le traitement de cette eau polluant ; les procédés d’oxydation avancée notamment les techniques Fenton et Photo- Fenton. Nous avons optimisé pour les deux techniques les conditions opératoires, notamment, le pH, la teneur en H2O2, la teneur en Fe2+, la charge en polluant. Les deux techniques utilisées ont été très probantes ou des taux proche de 100 % ont été obtenu

DESIGN OF AN INTELLIGENT NAVIGATION STRATEGY TO DEAL WITH UNEXPECTED DYNAMIC OBSTACLES

International audienceThis paper deals with the problem of navigating through a poorly known environment cluttered with both static and dynamic obstacles. The proposed strategy relies on two controllers allowing to reach the goal and to avoid the obstacles. Two contributions can be highlighted: (i) the definition of a safe avoidance distance which can be adequately modified during the mission if a moving obstacle is encountered; and (ii) the choice of a sense of motion depending on the obstacle motion. Simulation results validate the proposed strategy

Birthweight Depression in Male Rats Contiguous to Male Siblings in Utero Exposed to High Doses of 1,3-Butanediol during Organogenesis

The embryotoxic effects of high doses of the narcotizing ethanol dimer 1,3-butanediol were evaluated in pregnant Long-Evans rats during the “critical period” of organogenesis. Butanediol was given by gavage at levels of 0,7060,4236, or 706 mg/kg per day (24,14.4, or 2.4% of the acute oral LD50 value for rats). Maternal sedation was observed at 7060 and 4236 mg/kg, but feed consumptions and maternal body weights were unaffected. Butanediol caused a significant, dose-dependent decrease in offspring birthweights. At the highest butanediol dose, birthweights were preferentially and significantly decreased in male pups not contiguous in utero to female siblings. Other group I1 offspring were not affected and did not differ significantly from controls. As butanediol was given prior to the period of greatest fetal growth and fetal sex steroidogenests, it is concluded that intra-uterine levels of female sex steroids (estradiol) enhance fetal repair of cellular damage (restitution ad integrum), whereas testosterone inhibits fetal repair or exacerbates previous embryonic damage by some unknown mechanism. Such interaction furthers the concept that intrauterine position affects the endpoints of developmental toxicity, as expressed at partuition. </jats:p

DESIGN OF AN INTELLIGENT NAVIGATION STRATEGY TO DEAL WITH UNEXPECTED DYNAMIC OBSTACLES

International audienceThis paper deals with the problem of navigating through a poorly known environment cluttered with both static and dynamic obstacles. The proposed strategy relies on two controllers allowing to reach the goal and to avoid the obstacles. Two contributions can be highlighted: (i) the definition of a safe avoidance distance which can be adequately modified during the mission if a moving obstacle is encountered; and (ii) the choice of a sense of motion depending on the obstacle motion. Simulation results validate the proposed strategy