Abstract: An acoustic matching structure is used to increase the power radiated from a transducing element with a higher impedance into a surrounding acoustic medium with a lower acoustic impedance. The acoustic matching structure consists of a thin, substantially planar cavity bounded by a two end walls and a side wall. The end walls of the cavity are formed by a blocking plate wall and a transducing element wall separated by a short distance (less than one quarter of the wavelength of acoustic waves in the surrounding medium at the operating frequency). The end walls and side wall bound a cavity with diameter approximately equal to half of the wavelength of acoustic waves in the surrounding medium. In operation, a transducing element generates acoustic oscillations in the fluid in the cavity.

Abstract: A method of treating particles by disaggregating, deagglomerating, exfoliating, cleaning, functionalising, doping, decorating and/or repairing said particles, in which the particles are subjected to plasma treatment in a treatment chamber containing a plurality of electrodes which project therein and wherein plasma is generated by said electrodes which are moved during the plasma treatment to agitate the particles.

Abstract: A method of treating particles by disaggregating, deagglomerating, exfoliating, cleaning, functionalizing, doping, decorating and/or repairing said particles, in which the particles are subjected to plasma treatment in a treatment chamber containing a plurality of electrodes which project therein and wherein plasma is generated by said electrodes which are moved during the plasma treatment to agitate the particles.

Abstract: A method of treating particles by disaggregating, deagglomerating, exfoliating, cleaning, functionalising, doping, decorating and/or repairing said particles, in which the particles are subjected to plasma treatment in a treatment chamber containing a plurality of electrodes which project therein and wherein plasma is generated by said electrodes which are moved during the plasma treatment to agitate the particles.

Abstract: A drilling rig (10) having a boom (12) supporting a leader (36). The leader (36) is pivotally attached to the boom and is moveable between a generally upright orientation and a generally horizontal orientation for the purposes of transportation by a vehicle (11). Hydraulic rams (33) cause linear movement of the leader relative to the boom while the hydraulic ram (33) causes tilting of the boom about a generally horizontally axis.

Abstract: A drilling rig (10) having a boom (12) supporting a leader (36). The leader (36) is pivotally attached to the boom and is moveable between a generally upright orientation and a generally horizontal orientation for the purposes of transportation by a vehicle (11). Hydraulic rams (33) cause linear movement of the leader relative to the boom while the hydraulic ram (33) causes tilting of the boom about a generally horizontally axis.

Abstract: The invention comprises a darkroom safelight having (a) a light filter consisting of negative color film which has been exposed to a white light source (such as a generally continuous, uninterrupted light-reflective surface illuminated by white light) and then developed with color developer, and (b) at least two color filters selected from the colors of magenta, cyan and yellow. The minimum densities of these color filters are determined by the work-fogging factor; the maximum densities are determined by the factor of visual illumination of the work area.