An easily-dispersible compn. having a high degree of granularity and free-fluidity comprises, a powder of water-soluble polymer having flocculating ability, a hydrated sodium sulphate, and an opt. hydrated magnesium sulphate and/or hydroscopic agent. The water soluble polymer is a nonionic polyacrylamide, an anionic partially hydrolysed polyacrylamide or sodium carboxymethyl cellulose, or cationic...

The method identifies the external aluminium alloy face or faces of a homogeneous or composite material by electrochemical means. It involves forming, in situ on the products to be identified, an anodic layer by electrolysis under predetermined conditions and monitoring the variations in the voltage U across the terminals of the electrolytic unit as a function of time t during a constant curr...

Dispensing apparatus 1 for a pressurized dispensing container has a valve, a valve actuator and a flow regulator comprising a washer 13 located in a housing 11 such that an aperture 14 of the washer forms a constriction presenting an impedance to the flow. The washer is resiliently deformable to vary the impedance presented by the constriction in response to variation in the pressure differential ...

PCT No. PCT/AU87/00190 Sec. 371 Date Mar. 3, 1988 Sec. 102(e) Date Mar. 3, 1988 PCT Filed Jun. 30, 1987 PCT Pub. No. WO88/00129 PCT Pub. Date Jan. 14, 1988.The method of reinforcing a structure formed by interengaging the edges of ribbed strip (1) formed of a plastics material to form a helically wound tube, the strip (1) comprising a plurality of the ribs (2) spaced apart and upstanding from a ba...

A semiconductor photodetector device comprises an insulating gate field effect transistor having a channel region of a first conductivity type, a gate electrode formed of a semiconductor of the same conductivity type, and a gate extension portion formed of a semiconductor of a second conductivity type, the gate electrode and the gate extension portion forming a photosensitive PN junction not locat...

A mobile, offshore, jack-up, marine platform, adjustable for sloping sea floor having a mat, a multilegged column pivotally connected thereto and a work platform slidably mounted on the column. Means are included for independently vertically adjusting at least one leg and for selectively cantilevering a drilling unit on the work platform, with offset ballasting of the work platform.

The semiconductor device with a ring shaped control electrode and a control electrode for large capacity gate turn-off thyristor has a thyristor element on which a cathode electrode is formed as main electrode and a gate electrode as control electrode, an anode being formed on the underside. An outer plate is inserted between the periphery of cathode and an outer cathode electrode. A inner plate...

Large area photovoltaic devices are defined by applying a pattern of electrically-insulating material directly atop the exposed surface of the semiconductor material. Methods of producing these photovoltaic devices in a continuous or batch process are also disclosed herein. Each large area device may include a matrix of electrically-isolated segments, each segment including a common substrate, a s...

Disclosed is an apparatus and assembly (50) for manufacturing photovoltaic devices of the type including a plurality of layers of semiconductor materials by depositing the materials onto a substrate (11) from a microwave energy excited plasma. The asembly includes a deposition chamber (30) a source of microwave energy, and an antenna (64) extending into the chamber (30) and coupled to the microwav...

A buffer device for the spiral housings of water turbines wherein the housing includes an extension located along the axis of the inlet conduit into the housing and wherein a hydraulic cylinder and piston assembly is disposed between the extension and a fixed support with a fluid conduit extending between the housing and the cavity of the hydraulic cylinder and piston assembly.

A base for a sealed storage container 10 which is supported with its centre of gravity above the base and is constructed with a curved bottom along at least one vertical plane. The base comprises a horizontal, load- bearing underlay 12 and a plinth 11 which supports with an essentially plane bottom surface 13 against the underlay 12, and connects with a vertical wall 15 to the container bottom. Th...

The present invention relates to an extraction device for use with arc-welding tools for evacuating the smoke formed during the arc-welding, the device being connected to a suction source and comprising a handle, which is tubular and constitutes a duct for the welding smoke and which is connected to a suction pipe enclosing a consumption-type welding electrode. According to the invention, the suct...

Before the slurry is stored, it is mixed with coarse earth or a similar material in a mill to facilitate good deposition before grassing over. The store comprises several layers of slurry separated by impermeable plastic sheets e.g.. The sheets are arranged to drain into water channels which are on the support walls. Rain waterr from slurry which is contaminated with heavy metal, is removed via dr...

Sun hat consisting of a flat sheet 1 of card. A central part 2 has been defined in the latter by means of perforations and can easily be removed and it can, for example, form a postcard. Extending radially outwards from the central part 2 there are slits 3, and, after the central part 2 has been removed, the slits can be bent upwards so that the user can place his head in the opening 2, with flaps...

forming an InGaAsP contact layer on a semiconductor layer; adding an InP cover layer; cleaning the InP surface with a soln. which dissolves In; and removing the InP layer by selective etching. The soln. is pref. HF/ HNO3 and the selective etchant is pref. HCl or Br.

The LED formed by metal-organic CVD comprises a double heterojunction of clad layer (13)-active layer (14)-clad layer (15) structure and a current narrowing structure of a metal contact (16) with a surrounding insulating film or reverse junction. The substrate (11) is GaAs in an alternative embodiment, and the structure is formed by a vapour growth method, that is metal organic CVD or molecular be...

The invention is related to semiconductor LED in which a double hetero junction structure is formed by metal-organic CVD. The semiconductor is composed of III-V group compounds. The characteristic of the device is to decrease in diffusion resistance in a clad layer being away from an active layer, by injection carrier in the closet layer from the active layer of the clad layer which consists of ...

A combined spring and damper comprises a plurality of spring elements (1), each of zig-zag form, disposed in radial planes with respect to a common axis. Also situated on the axis is a mass (7) of resilient material. When the spring is compressed along the axis the inward contraction of inner reflex portions (3) of the spring elements is resisted by the mass of resilient material, and the resultin...