Abstract: An electrical generator which includes a magnetic field generated within a housing (10) by permanent magnets (19, 20) located within the housing and a coil (23) is resiliently mounted within the magnetic field such that movement of the housing induces movement of the coil to generate a current. The generator includes an electronics device (45) connected to the coil which is adapted to rectify the current and incorporating a charge storage device (46). In one embodiment, at least one coil is suspended on a torsion wire (33) within the magnetic field and the torsion wire carries a counter weight (47) whose mass is selected to resonate with the vibrational frequency to which the generator is subjected. The coils are arranged to oscillate at frequencies less than 100 Hz and are particularly useful in harvesting the motion and vibration of vehicles.

Abstract: A floating modular cover for a water storage consisting of a plurality of modules in which each module includes a chamber defined by an upper surface and a lower surface there being openings in the upper surface to allow ingress of water into said chamber and openings in the upper surface to allow air to flow into and out of said chamber depending on the water level within said chamber to provide ballast for each module floats. The modules prevent water evaporation from the area covered and the shape and size is selected to ensure that the modules are stable in high wind conditions and don't form stacks. The modules may be made from identical hexagonal or octagonal halves by blow moulding or thermoforming.

Abstract: An electrical generator or motion sensor including a) a pair of elongated L shaped supports (15) fixed at one end but free to move at the other b) a coil (14) secured to the supports remote from the fixed end c) an array of permanent magnets (12) arranged adjacent the coil such that movement of the coil through the magnetic field induces an electric current in the coil. To rectify the current the supports are made of a piezoelectric polymer membrane so that movement of the coil stresses the membrane to generate a voltage that is used to turn on a MOSFET transistor rectifier.