9 research outputs found
Impact des rejets urbains et industriels sur la qualitĂ© des eaux souterraines : cas de la rĂ©gion dâEl Kantar, Sud-Est AlgĂ©rien
La plaine dâEl-Kantara se trouvant Ă la limite NW de la Wilaya de Biskra, est le siĂšge dâun aquifĂšre superficiel dont les eaux sont beaucoup plus utilisĂ©es pour lâirrigation de quelques 22 000 palmiers. Pour Ă©valuer la pollution des eaux dans la plaine dâOued El Hai, des relevĂ©s piĂ©zomĂ©triques et des analyses chimiques ont Ă©tĂ© rĂ©alisĂ©s, pendant deux compagnes (septembre 2011et FĂ©vrier 2012), sur des Ă©chantillons d'eau prĂ©levĂ©es de neuf points. Les rĂ©sultats obtenus montrent des concentrations importantes en chlore, sulfates, matiĂšre organique (la DBO5, la DCO, PO4 3-, NO2 -, NO3 - et NH+4), et mĂ©taux lourds (chrome, plomb, cuivre et le fer) confirmant ainsi la forte dĂ©gradation des eaux de surfaces et souterraines.Mots-clĂ©s : aquifĂšre, hydrochimie, rejets, pollution, El Kantara, Biskra, AlgĂ©rie
Comparison Between In-flight SEL Measurement and Ground Estimation Using Different Facilities
This paper describes a comparison between in-orbit single-event effects (SEE) rate measurement acquired by the CARMEN-3 experiment on-board the JASON-3 satellite (middle earth orbit, 1336 km, 66°) and an estimation using SEE rate calculation approaches from several facilities. A SRAM memory sensitive to single-event latchup (SEL) has been monitored in orbit, and the number of events per day was estimated using monoenergetic data coming from the Kernfysisch Versneller Instituut (protons) and Université Catholique de Louvain (heavy-ions) facilities as well as using mixed-field data coming from the Cern High energy AcceleRator Mixed field (CHARM) facility. A comparison of both estimations with respect to the in-flight measurement has been carried out
Comparison Between In-flight SEL Measurement and Ground Estimation Using Different Facilities
Radiation Hardness Assurance Through System-Level Testing: Risk Acceptance, Facility Requirements, Test Methodology, and Data Exploitation
X-rays, Îł-rays and Proton Beam Monitoring with Multimode Nitrogen-doped Optical Fiber
International audienceWe investigated the potential of a multimode (50 ÎŒ m core diameter) nitrogen doped silica-based optical fiber for X-rays, protons and Îł-rays radiation detection and dosimetry. X-rays results confirm that this N-doped fiber presents a strong radioluminescence (RL) around 550 nm when exposed to radiation. The RL observed from a few cm long sample linearly depends on the dose rate at least in the 1 mGy/s to 50 Gy/s range. Low dose rate Îł-ray tests demonstrate the radiation detection at dose rate as low as 40 ÎŒ Gy/s with a 2 m long fiber sample. This fiber is also associated with an optically-stimulated luminescence (OSL) when exposed to a 1064 nm laser light post-irradiation. This OSL signature provides shortly after the irradiation a precise estimation of the accumulated dose at least in the 1 Gy to 10 kGy range. Under proton exposure, we benchmarked the performances of the N-doped fiber with the ones of a conventional Markus chamber used by the TRIUMF proton-therapy team. This comparison highlights the potential of the small-size N-doped fiber to partially overcome the known limitations of commercial fiber-based dosimeters for medical applications. The obtained results are very promising for the future design of more complex spatially-resolved beam monitoring systems
Solubility and LiquidâLiquid Equilibrium of Aqueous Systems of Iodoethane with Methanol, Ethanol, or 1-Propanol at Temperature 298.15 K and Pressure 101.2 kPa
X-Rays, <inline-formula> <tex-math notation="LaTeX"> </tex-math> </inline-formula>-Rays, and Proton Beam Monitoring With Multimode Nitrogen-Doped Optical Fiber
Direct Ionization Impact on Accelerator Mixed-Field Soft Error Rate
We investigate, through measurements and simulations, the possible direct ionization impact in the accelerator soft error rate, not considered in standard qualification approaches. Results show that, for a broad variety of state-of-the art commercial components considered in the 65 nm to 16 nm technological range, indirect ionization is still expected to dominate the overall soft-error rate in the accelerator mixed-field. However, the derived critical charges of the most sensitive parts, corresponding to âŒ0.7 fC, are expected to be at the limit of rapid direct ionization dominance and soft-error increase.peerReviewe