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Comparing q-ary relations on a set O of elementary objects is one of the most fundamental problems of classiication and combinatorial data analysis. In this paper the speciic comparison task that involves classiication tree structures (binary or not) is considered in this context. Two mathematical representations are proposed. One is deened in terms of a(More)
Removal of high concentrations of hydrogen sulfide using a biofilter packed with expanded schist under extreme acidic conditions was performed. The impact of various parameters such as H2S concentration, pH changes and sulfate accumulation on the performances of the process was evaluated. Elimination efficiency decreased when the pH was lower than 1 and the(More)
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