Abstract: An air cycle cooling system for cooling a first heat load and a second heat load, the system including a compressor to pressurise air in the system, and an expansion apparatus for allowing the compressed air to expand and cool for use in cooling the first and second heat loads, and wherein at least a proportion of the air utilised for cooling the first heat load is recycled to the compressor and at least a proportion of the air utilised for cooling the second heat load is utilised as a coolant in a primary heat exchanger to cool the air from the first heat load prior to the air from the first heat load being expanded in the expansion apparatus.

Abstract: The invention relates to a group application for group formation and management, in particular in a wireless environment. The present invention provides a group application in which a membership list of a group is kept updated automatically by communications between the group applications of the group. The group application handles all the complexity involved in setting up a group and maintaining a membership list for the group, without user intervention. Advantageously, the group application is implemented as a software agent. The invention also relates to an electronic device having a group application or software agent of the invention loaded therein.

Abstract: Ion implantation equipment is modified so as to provide filament reflectors to a filament inside of an arc chamber, and to remove the electrical insulators for the filament outside of the arc chamber and providing a means of shielding, thereby reducing the formation of a conductive layer on said insulators and greatly extending the lifetime and reducing downtime of the equipment. The efficiency of the equipment is further enhanced by means of an interchangeable liner for the arc chamber that increases the wall temperature of the arc chamber and thus the electron temperature. The use of tungsten parts inside the arc chamber, obtained either by making the arc chamber itself or portions thereof of tungsten, particularly the front plate having the exit aperture for the ion beam, or by inserting a removable tungsten liner therein, decreases contamination of the ion beam. Serviceability of the arc chamber is improved by means of a unitary clamp that separately grips both the filament and filament reflectors.

Abstract: A dental mirror comprising a handle with a reflecting mirror mounted at one end, an air jet tube secured to the handle and arranged to direct a flow of air onto the reflecting face of the mirror, and including a water supply tube from which droplets of water are supplied into the air stream from the air jet tube, this water clearing the mirror face of any debris obscuring the dentist's vision.

Abstract: A powder feeding apparatus in which a feed shoe, open at the top and bottom, is movable along a feed plate from a remote powder filling location to a position directly overlying a cavity into which the powder is to be fed. The apparatus includes a wire grid suspended in a horizontal plane near the bottom of the feed shoe and coupled to means for reciprocating it relative to the feed shoe to dispense fluent powdered material into the cavity. A photocell scanning system is provided for controlling the desired powder level and for detecting powder supply exhaustion.

Abstract: A tidal flap valve adapted to be located in sea walls, storage tank walls or banks of tidal rivers or other water courses in which the liquid level varies, the valve comprising a flap or closure member supported on a frame by a flexible hinge, the frame defining an opening and adapted for attachment to a substantially vertical wall about an opening therein, the hinge being protected against damage by being disposed in a substantially enclosed space defined by a portion of the frame and a portion of the closure member.