Browsing by Author "Bogdevici, Oleg"

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    Method of study gallium and arsenic losses in technology of gallium arsenate obtained from wastes [Articol]
    (2005) Baranov, Serghei; Redwing, Joan; Bogdevici, Oleg; Cinic, Boris; Izmailov, Denis
    Having the goal to recover gallium (Ga) and arsenic (As) from technological wastes derived from the process of growing epitaxial gallium arsenide structures, it is proposed to extract gallium arsenate (GaAsO4) by precipitation and filtration of the sediment. In this paper it is proposed to measure the concentrations of Ga and As by means of the atomic absorption spectrometer AAnalyst 800 directly in the filtrate solution. We compare the results obtained by two methods of elemental Ga and As atomization: flame and thermal atomization. The values of Ga and As concentrations in filtrate are function of pH for solutions containing 1- 680 mg/1 of Ga and 55-880 mg/1 of As. The developed method can be used to study and further optimize the technological process.
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    Soluţii pentru prevenirea şi diminuarea consecinţelor inundaţiilor [Articol]
    (2010) Duca, Gheorghe; Furdui, Teodor; Melniciuc, Orest; Zubcov, Elena; Gladchi, Viorica; Moraru, Constantin; Bogdevici, Oleg; Arnăut, Nicolae; Bujac, Victor
    The danger of floods is very up to date for the Republic of Moldova, so, two types of flood are characteristic: transboundary, caused by Dniester and Prut rivers, and local, caused by discharges of small streams, lakes, ponds. A group of experts from the Academy of Sciences of Moldova developed solutions to prevent damages caused by triggering floods. Among these are: the creation of National center of flood monitoring; the assessment of flood areas and the liable to inundation potential of Dniester and Prut rivers and small streams; the elaboration of “Scheme of protection of populated localities against flood”; the regular water sampling in flood areas to monitor the state of pollution; the implementation of flash flood model; the agreement between Ukraine-Republic of Moldova-Romania on monitoring, forecasting and sustainable exploitation of aquatic ecosystems etc.