It is a long-acknowledged fact that in wide number of Indo-European languages, some noun phrases occur solely the plural. As for French language — only one concerned this study examples as les semailles, pourparlers, environs, pantalons, etc., are very common ones. A subclass these plural invariable nouns (Pluralia tantum), shows specific properties, e.g., phrase does not behave like collective...

this study investigated the effect, on reactor performance and biomass retention inside the bed, of the material used to make the supports of anaerobic fixed-bed reactors. three inert supports of similar shape but made of three different materials polyvinyl chloride, polypropylene, high-density polyethylene were manufactured and used. all three supports had the same specific surface area but di...