Abstract: A switchable oscillating heat pipe (OHP) system that comprises an OHP device comprising a plurality of OHP microchannels, a switching control fluid reservoir fluidly connected to the OHP device by a fluid transfer conduit, and a reservoir temperature control device. The reservoir temperature control device is structured and operable to selectively adjust a temperature of the switching control fluid reservoir to create a pressure differential between the switching control fluid reservoir and the OHP device. The pressure differential will generate movement of a working fluid between the switching control fluid reservoir and the OHP device to in-situ change a working fluid fill fraction of the OHP device to selectively switch OHP device between an ON state and an OFF state.

Abstract: A method of moulding racquets to define stringing holes in the moulded frame. The method includes forming at least one approximately ladder-shaped member having two side pieces interconnected by rung pieces, with the side pieces substantially conforming to the curved shape of at least part of the frame of the racquet; entrapping the ladder-shaped member between two mould plates defining a mould cavity; injecting a plastic material into the mould cavity to mould the frame around the rung pieces; and forming the ladder-shaped member in two parts and separating the two parts after the frame has been moulded to remove the ladder-shaped member from the moulded frame.