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An information retrieval technique that could be used successfully in the E-Learning domain is provided in this article. The described system is based on a relevancefeedback scheme. It retrieves relevant documents from an information database, those documents being useful in the learning process. The proposed system is an interactive one, the human user being involved in the retrieving process.

Water quality is one of the most important element for life support and contribute at the sustainable develop of human society. Following the technical and economic transformations taking place in industry, waste water remediation system required new approaches to management in this area. It recorded an increase in the variety and complexity of the types and quantities of waste generated in the last years and for administrated this situation are necessary new methods and equipments of waste neutralisation or trans...