A motion detection unit for detecting motion by means of Doppler frequency shift which comprises: a microwave circuit board comprising an oscillator, a hybrid coupler circuit element and a mixer; an antenna board comprising at least one transmit and receive antenna; and a ground plane layer, the two boards being superimposed with the ground plane layer intervening, wherein, in operation, the hybrid coupler circuit element divides power from the oscillator into power for the antenna transmission ...

Edge Enhanced Noise Reduction (EENR) is a frequency dependent instantaneous compander system. It is applied only in the encoder both to Chrominance and luminance, and is best placed after the horizontal and vertical down sampling filters in the pre-processing stages of an encoder (not shown per se). High frequency, low level information (mainly noise) are reduced significantly in amplitude. In particular, EENR is designed to preserve edge details. In addition, a vertical recursive filter can be ...

Cephalosporin antibiotics of formula ##STR1## (where R is thienyl or furyl; R.sup.a and R.sup.b are each selected from hydrogen, C.sub.1-4 alkyl, C.sub.2-4 alkenyl, C.sub.3-7 cycloalkyl, phenyl, naphthyl, thienyl, furyl, carboxy, C.sub.2-5 alkoxycarbonyl and cyano, or R.sup.a and R.sup.b together with the carbon atom to which they are attached form a C.sub.3-7 cycloalkylidene or cycloalkenylidene group; m and n are each 0 or 1 such that the sum of m and n is 0 or 1; and P is hydrogen or halogen)...

A compound of formula (I) to (III) ##STR1## in which the symbols R to R.sub.6 are organic radicals. These compounds can be used as intermediates in the production of a phosphite-HALS product.

A flying control system in a VTOL or V/STOL aircraft comprises a mechanical analoque `model` of the lift and propulsion plant of the aircraft. Vertically-disposed electromechanical transducers represent, respectively, the lift engines of the aircraft, each transducer being vertically extendible and also tiltable in the fore-and-aft direction and delivering two electrical output signals, indicating vertical extension and tilt respectively, to control respectively the throttle opening and thrust d...

A machine for counting articles, comprising means for dispersing a flow of articles to be counted into separate streams, means for providing a substantially even flow of articles to the dispersing means, a detector associated with each stream for detecting each article in that stream and counting means fed by the outputs from all detectors for counting the total number of articles in all the stream.

The cords of a string net for the frame of upholstered furniture at the points where they intersect one another are fastened to one another by means of rings or clamps. The cords consist of plastics and are arranged perpendicular to the frame. The cords which are crosswise arranged to the sides of the frame are strung more tightly than the cords which are strung lengthwise to the frame sides.

A device is described which can be used to orient, precisely, dental casts in centric occlusion. The device comprises upper and lower frames that have dental cast support means and that are hinged together in a joint along the condylar axis. The joint permits only pivotable movement of the members in a medial plane. One of the frames, preferably the lower, has centering pivot pins with tapered ends that seat in mating recesses in the joint component of the other frame. A centric inspection or ga...

A steering and propulsion system for a guided missile, in which thrust vectoring of the propulsive effluent is achieved by means of a dirigible tail nozzle. The dirigible nozzle is mounted on a spherical bearing to swivel about a point lying at the centre of the throat of a fixed convergent/divergent inner nozzle disposed within the dirigible nozzle. Aft of the swivel point, the dirigible nozzle has a convergent portion leading to a divergent mouth, and the inner wall of the convergent portion i...

A calendar display mechanism adapted to be mounted on the wrist band of a watch or similar device comprising a unitary casing having a curvature on the undersurface adapted to conform to the curvature of the wrist band, the upper surface of the casing providing in its intermediate portion a display area over which a flexible calendar may pass. At opposite ends of the display area a hollow cylindrical portion is provided to house the opposite ends of the calendar strip and spindles are mounted co...