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A non-linear software sensor to monitor the internal nitrogen quota of phytoplanktonic cells ArchiMer
Bernard, O; Sciandra, A; Sallet, G.
New techniques - called software sensors - issued from the non-linear automatic control field and initially developed for non-linear chemical systems have been applied to a continuous culture of phytoplankton. A software sensor (or 'observer') combines an analytical differential equation based model and partial measurements of the system in order to estimate the non-measured state variables. It filters data and estimates the actual state of living systems, models of which are often rough approximations. The efficiency of this approach is illustrated with a nitrate-limited chemostat experiment with the chlorophyceae Dunaliella tertiolecta performed in a computer controlled fluctuating environment. (C) 2001 Ifremer/CNRS/IRD/Editions scientifiques et...
Tipo: Text Palavras-chave: Modèle de Droop; Systèmes non linéaires; Observateurs; Phytoplancton; Droop model; Non-linear systems; Observers; Phytoplankton.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/00322/43340/42888.pdf
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The French experience in sampling discards at sea in the European waters ArchiMer
Tetard, Alain; Gaudou, Olivier; Lespagnol, Patrick; Peronnet, Isabelle; Rochet, Marie-joelle; Vigneau, Joel.
This study covered a one year period using onboard observers (117 days at sea). The aim was to sample "métiers" known for their discarding side effects: fixed netting, inshore and offshore trawling. The objectives were (i) the collection of information on the demographic structure of the catches for the main exploited species and (ii) the identification of factors explaining discards, in order to find relevant management measures
Tipo: Text Palavras-chave: Celtic Sea; French trawlers; Sampling; Observers; Discard; Metiers; Mer Celtique; Chalutiers français; Échantillonnage; Observateurs; Rejets; Metiers.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/rapport-6129.pdf
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