Communications Internationales

Permanent URI for this collectionhttps://dspace.univ-boumerdes.dz/handle/123456789/11

Browse

Subject: search.filters.subject.Contamination

Search Results

Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    Characterization of used engine oil and possibility of recovery
    (2018) Zerdane, Youghourta; Hachemi, M.; Tazrout, M.; Largeau, Jean-François
    The world today is facing major energy and climate challenges. The growth of global energy demand, the decline in fossil reserves and the dangerous disruption of the climate caused by pollution compels states and scientists to quickly adopt plans strengthened action on renewable energies and the treatment of different types of waste generated by human activity, such as used motor oils in order to preserve the environment and to find other sustainable and economically viable solutions. This work, based on a characterization study of used motor oil, has shown that these characteristics deteriorate after a certain time of use compared to a new oil and that they become polluting due to contamination by inorganic elements (metal). The high calorific value of the used oil can be considered as an important source of energy, hence the need to develop a process for the upgrading of this waste and for this purpose it is envisaged to explore later one of these ways which is pyrolysis
  • No Thumbnail Available
    Item
    Deuterium and impurity contamination of divertor tiles and collector probes of asdex-upgrade
    (Fusion and plasma physics, 1998) Hildebrandt, D.; Akbi, Mohamed; Jüttner, B.; Rohde, V.; Schneider, W.
    The uptake and release of hydrogen isotopes at the plasma-facing components in magnetic, confinement fusion devices affects the working gas recycling, the plasma behaviour and the tritium inventory [1]. This attracts considerable interest in the investigation of hydrogen trapping during plasma exposure. The most intensive plasma material interaction occurs on limiters and divertor plates. Post-mortem analysis of such components gives information on the total amount of hydrogen isotopes retained in the material after plasma exposure. Recent investigations of divertor tiles of ASDEX-UPGRADE have shown that the dominant trapped deuterium amount is contained in the deposited material at the surface [2]. This surface contamination consists mainly of carbon, boron and the hydrogenic isotopes. Movable collector probes have been applied to investigate the hydrogen trapping and impurity deposition under specific plasma conditions. In the present paper results on the impurity and deuterium contamination at the surface of collector samples are presented and compared with corresponding results from the divertor tiles. The collector samples were exposed to the scrape-off plasma of the main chamber (SOL-probe) and to the divertor plasma (DIV-probe)