Abstract: A microfluidic preconcentrator is provided, designed to receive a gas sample containing gaseous pollutants such as volatile organic compounds, to concentrate the gaseous pollutants and to transfer them to an analysis device. An assembly comprising an enclosure, a microfluidic preconcentrator, connectors and a means for holding the microfluidic preconcentrator inside the enclosure, a heating device and a cooling device, are provided.

Abstract: “CONSTRUCTIVE ARRANGEMENT IN A THERMAL CHAMBER FOR THE PRODUCTION OF HOME-MADE YOGHURT”, selectively chosen to be natural or greek, said thermal chamber being comprised of an outer container (casing) (1) provided with its respective lid (2); the said casing (1) embodied by an internal perimeter frame (3) next to its upper edge, which selectively accommodates and supports coaxially an inner container (4) and/or a filter container (6); wherein the inner container (4) has smaller dimensions than the casing (1), in a way that creates between the two structures a free perimeter space that works as an air chamber (5) which act as a thermal insulator to the thermal chamber (1, 2); being that the filter container (6), with slightly smaller dimensions when compared to the inner container (4), tightly fits in the inner container (4), but still with a depth not as profound as in the inner container (4), creating a collector interspace (7) between the bottom walls of both structures; the bottom wall of the filter contain

Abstract: This invention relates to ?-SiC foam parts with a specific surface area preferably equal to at least 5 m2/g and with at least two zones A and B with a different cellular porosity distribution, wherein the parts were made by chemical transformation of a porous precursor medium comprising at least two blocks A? and B?, each having a different cellular porosity distribution, and in that the at least two zones A and B are derived from the chemical transformation of the two blocks A? and B?. This foam, optionally after deposition of an active layer, may be used as a filter medium in cartridges designed for the purification of exhaust gases. The invention also relates to manufacturing processes for preparing such a filter medium.

Abstract: This invention relates to ?-SiC foam parts with a specific surface area preferably equal to at least 5 m2/g and with at least two zones A and B with a different cellular porosity distribution, wherein the parts were made by chemical transformation of a porous precursor medium comprising at least two blocks A? and B?, each having a different cellular porosity distribution, and in that the at least two zones A and B are derived from the chemical transformation of the two blocks A? and B?. This foam, optionally after deposition of an active layer, may be used as a filter medium in cartridges designed for the purification of exhaust gases. The invention also relates to manufacturing processes for preparing such a filter medium.