Abstract: An adjustable ergonomic back for a seat is disclosed. The back has a plurality of back cushions, each cushion having at least one adjustment area. It further comprises a structural shell having a plurality of voids therein. A plurality of thin flexible elements are located between the back cushions and the structural shell, each flexible element being attached to the structural shell. Each of the flexible elements has a front surface and a back surface, the front surface being in contact with a respective adjustment area of one of the plurality of back cushions. The back further has a plurality of actuators located between the flexible elements and the structural shell, each of the actuators being in contact with one of the respective back surfaces of the flexible elements and exerting a pressure on the back surface.

Abstract: An adjustable ergonomic back for a seat is disclosed. The back has a plurality of back cushions, each cushion having at least one adjustment area. It further comprises a structural shell having a plurality of voids therein. A plurality of thin flexible elements are located between the back cushions and the structural shell, each flexible element being attached to the structural shell. Each of the flexible elements has a front surface and a back surface, the front surface being in contact with a respective adjustment area of one of the plurality of back cushions. The back further has a plurality of actuators located between the flexible elements and the structural shell, each of the actuators being in contact with one of the respective back surfaces of the flexible elements and exerting a pressure on the back surface.

Abstract: Snowplow equipment is described which is adapted to be mounted to a road vehicle wherein composite materials are used in the construction of all load bearing structural components of the equipment. Each component is lightweight and has inherent damping characteristics to reduce the transmission of road surface vibrations to the vehicle and to reduce power consumption. Essentially, each component is formed of a sandwich construction of wood and of laminates of glass fibers and resin.

Abstract: Disclosed is a core for use in a core-board, which consists of an embossed sheet of a light weight material comprising a central surface extending in a plane and a plurality of embossments called top and bottom cells, that are identical in shape and project from the central surface on both sides thereof. Each of the top and bottom cells is integral to the central surface and of pyramidal shape. Each of them also has an open base of regular hexagonal shape extending in the plane of this central surface and a top flat surface of regular hexagonal shape and of a smaller surface area than the base. These top and bottom cells are regularly distributed onto the central surface in such a manner that each top cell is not adjacent to another top cell but extends edge to edge to three spaced apart bottom cells, and each bottom cell is not adjacent to another bottom cell, but extends edge to edge to three spaced apart top cells.

Abstract: A jet aeration header is disclosed, for use in water and wastewater process and treatment system. The header comprises a first pipe defining a cylindrical water passage, a second pipe extending parallel to the first pipe and defining a cylindrical air passage, at least one water outlet conduit connected to the first pipe to allow water to be expelled out of the water passage, an air-feed pipe connecting the second pipe to the outlet conduit to allow air to be delivered from the air passage to the water flowing through this conduit, and a venturi cone mounted in the outlet conduit to allow air to be FED from the air passage and be mixed with a water expelled through the outlet conduit.