Abstract: The retractable protection device (100) for protecting a user's head against environmental elements comprises: at least one hoop (110); at least two articulations (135) of at least one hoop with a base, each articulation being attached to one end of at least one hoop, at least one articulation comprising a means for locking said hoop in a predefined position referred to as the “deployed position”; an at least partially closed base (150), configured to surround the user's nape at least partially, comprising: at least one support (130) resting on each shoulder of the user; and at least one spreader (140) for positioning each articulation at a predefined distance from each support in the deployed position; a sheet of fabric (115) attached to each hoop and the base to create a protection screen around the user's head in the deployed position, the fabric and hoops being circumscribed by the base in a position referred to as the “folded position” that minimizes the size of the device, between the user's nape

Abstract: A system for storing and producing electrical energy deployed in a volume of water delimited by a bottom, comprising a floating structure at the surface of the volume of water, at least one linear and continuous solid mass connected to the platform and movable between a high position and a low position, at least one device for driving one or more linear and continuous solid mass(es) between the high and low positions thereof; the linear and continuous solid mass comprises: an upper end positioned at the surface of the volume of water an opposite end which is free or connected to the bottom of the volume of water a portion lying on the bottom, also called a trailing portion, which is maximum when the linear and continuous solid mass is in the low position; a suspended portion, which is maximum from the moment that a trailing portion exists.