A liquid potential energy increasing device includes a first receiving trough, a second receiving trough, a liquid absorbing structure, a first magnetic component, and a second magnetic component. The liquid absorbing structure includes a main body portion and an extending portion. The extending portion conveys a liquid in the first receiving trough into the main body portion. When a sum of a weight of the main body portion and a weight of the liquid in the main body portion is greater than the magnetic attraction, the main body portion hits the second receiving trough by gravity, so that the liquid in the main body portion is at least partially released to the second receiving trough so as to increase potential energy of the liquid.

Extracorporeal circuit devices can be used for on-pump open-heart surgery to support surgical procedures such as coronary artery bypass grafting. In some cases, a centrifugal pump is used as part of an extracorporeal circuit. Centrifugal pump heads are described herein that induce flow on two sides of an impeller plate, and that can be conveniently mechanically assembled.

A water-cooling device includes a pump case, at least one winding, a driver and a heat exchange member. The pump case has a top section, a bottom section and a peripheral section together defining a pump chamber. The winding is disposed on a circuit board. The circuit board is disposed on any of the top section, the bottom section and the peripheral section. The driver is disposed in the pump chamber. At least one magnetic member is disposed on the driver in a position corresponding to the winding, whereby the magnetic member can induce and magnetize the winding on the circuit board. The heat exchange member is connected with the pump case. By means of the structural design of the water-cooling device, the volume of the water-cooling device is greatly minified and the structure of the water-cooling device is thinned.

A vertical axis wind turbine, comprising, a plurality of blades, wherein the blades are an aerofoil, a rotor shaft, the rotor shaft further comprises a rotary section and a stationary section. The plurality of magnet rings further comprises a first magnet ring. The first magnet ring is attached to the rotary section of the rotor shaft and the second magnet ring is attached to the stationary section of the rotor shaft, wherein the first and second magnet rings are cylindrical magnets and comprises a hole in middle of the rings, the first magnet ring is attached to the rotary section of the rotor shaft further consists a particular charge and the second magnet ring is attached to the stationary section of the rotor shaft.

This electrostatic converter comprises a rotor comprising at least one blade designed to receive an air flow; a stator comprising at least one electrode; a flexible membrane fitted on the blade, and comprising a counter-electrode, the electrode or the counter-electrode being coated with a dielectric material suitable to be polarized; the flexible membrane describing a trajectory when the rotor performs a rotation; the flexible membrane being configured to come into sliding contact with the stator on a first part of the trajectory, and configured to be at a distance from the stator on a second part of the trajectory so as to form a variable electric capacitance variable suitable to induce an electric current.

A pump system comprises a fluid housing, a permanent magnet rotor, and an electric stator. The fluid housing has an axis, an axial inlet, and a radially outer outlet. The permanent magnet rotor is disposed on the axis, within the fluid housing, and has a plurality of perimetrically distributed fins that extend at least partly radially outward. The electric stator is disposed on the axis and within the fluid housing, and is situated adjacent the impeller fins of the permanent magnet rotor, separated from the impeller fins by an axial gap.

A wind turbine tower evacuation tool is provided including an object end for attachment to an object or a person and a roller end configured for connection to a surface of a wind turbine tower by magnetic attraction. The roller end includes at least one magnet body arranged for rotation around a rotational axis of the roller end. The wind turbine tower evacuation tool further includes a rope element connecting the object end to the roller end.