Abstract: A DC-to-DC converter for an electrical aircraft propulsion system designed to be connected in series with an electrical energy storage unit of the electrical propulsion system. The DC-to-DC converter includes an inverter, a transformer and a rectifier, and further includes a current source that is connected to the rectifier and is configured to control the power passing through the DC-to-DC converter. The transformer includes a primary and two secondaries, the two secondaries sharing a common terminal designed to be connected to a high-voltage DC bus of the electrical propulsion system and two other terminals that are connected to the rectifier. The rectifier includes two arms including at least two transistors that are each in series and are connected, on the one hand, to the two other terminals of the transformer and, on the other hand, to the current source.

Abstract: The invention pertains to a biodegradable coating composition, comprising a crosslinked starch and a filler, and optionally a polyol plasticizer, as well as to outside structures such as greenhouses, comprising a coating layer obtained by drying the said coating composition. The invention furthermore pertains to removal of the coating layer using a targeted cleaning composition.

Abstract: The invention pertains to a biodegradable coating composition, comprising a crosslinked starch and a filler, and optionally a polyol plasticizer, as well as to outside structures such as greenhouses, comprising a coating layer obtained by drying the said coating composition. The invention furthermore pertains to removal of the coating layer using a targeted cleaning composition.

Abstract: A device reducing evaporation in a reagent bottle, in particular in an automatic appliance for analyzing samples, the device being in the form of a tube inserted into the bottle and including, in its top portion, an annular rim for bearing on the top end of the neck of the bottle, and means for centering in the neck of the bottle.