An N-on-P gallium arsenide solar cell, and solar cell arrays incorporating N-on-P gallium arsenide solar cells. In the N-on-P gallium arsenide solar cell, the n-type gallium arsenide faces the sun. The solar cell arrays utilize geometrically alternating, laterally disposed N-on-P solar cells and P-on-N solar cells. Series electrical connections between adjacent solar cells in the array are accompl...

In a method of producing a gas containing carbon monoxide and hydrogen, in which method the gas does not need to be subjected to energy-consuming and costly scrubbing steps before being used as reduction gas, combustion gas or synthesis gas, the gas is produced from material containing carbon and/or hydrocarbon and oxidant and is supplied to a reaction chamber (2) simultaneously with a gas heated ...

The invention relates to a substantially thixotropic nondilatent cementations admixture for use as a mortar, cement or concrete which comprises an hydraulic cement in combination with presized inorganic filler particles.

Laser apparatus includes a ceramic tube 11 which contains a gas and within which is located a cylindrical cathode 12 having a plurality of holes 13 therethrough. An anode 15 is located along the axis of the tube 11. During operation of the apparatus, a large potential difference is applied between the anode 15 and cathode 12, causing a plurality of electron beams to be formed extensive of the hole...

An alumina fiber structure of a flat shape composed of alumina fibers having an alumina content of at least 65% by weight, the majority of said fibers being oriented substantially in parallel with the flat surfaces of the structure, and a number of fiber strands composed of the same alumina fibers extending inwardly from the flat surfaces of the structure, said structure having a thickness of at l...

The present invention relates to masterbatches for delustring processable polyamides. They contain 50 to 90% of a copolyamide used as a binder and consisting of 30 to 100% of hexamethylene adipamide units and 0-70% of caproamide units and 10 to 50% by weight of anatase titanium dioxide coated with 0.01 to 1.5% of silica and 1 to 3% of alumina and treated with a polydimethylsiloxane oil present in ...

The present invention relates to masterbatches for delustring processable polyamides. They contain 50 to 90% of a copolyamide used as a binder and consisting of 30 to 100% of hexamethylene adipamide units and 0-70% of caproamide units and 10 to 50% by weight of anatase titanium dioxide coated with 0.01 to 1.5% of silica and 1 to 3% of alumina and treated with a polydimethylsiloxane oil present in ...

The device can be connected by means of the terminals (10,11) of the interface (4) between a computer and a peripheral device, for recognition and storage of fee data contained in the programs. The device is transparent to normal data, but fee data is recognised by a program-controlled logic (1,2) and filed in a memory arrangement (3,8). One memory (8) of the memory arrangement can be separated fr...

Gasoline composition comprising a major amount of a gasoline suitable for use in spark-ignition engines, and a minor amount of an alkali metal or alkaline earth metal salt of a succinic acid having as substituent on at least one of its alpha -carbon atoms an unsubstituted or substituted aliphatic hydrocarbon group having from 20 to 200 carbon atoms, or of a succinic acid derivative having as subs...

A lead article, e.g. lead shot or lead weight, coated with a coherent,wear-resistant coating of non-toxic but soft material, e.g. a solid film lubricant.

A navigational aid for the driver of a vehicle, particularly in a town, makes use of a geographical plan of the town which is subdivided into a distance grid having x and y co-ordinates which are at right angles to one another and which are fed into a computer, disposed on the vehicle, for the starting point and the destination point. A display device for the direction of travel and for the distan...

A process for preparing lubricating grease comprising a mixture containing from 15% to 40% by weight of polytetrafluoroethylene, from 60% to 85% by weight of a liquid dispersing medium which is a particularly defined perfluoropolyether or oligomer of trifluorochloroethylene, and 0.1% to 0.4% by weight of a perfluoroalkyl or polyoxyperfluoroalkyl surfactant and, optionally, a stabilizing and antico...

A switching circuit for connecting an input (1) carrying a plurality of frequency distinguished signals to an output (5) comprises a first input diode (14) connected in series with a second output diode (15) between a tapping of an input transformer (16) and the output, the transformer winding being connected between the signal input and ground. A first resistor (26) is connected between and in se...

A method is disclosed for effecting electronic article surveillance with a first high frequency signal and a second lower frequency signal, the second signal having a modulation characteristic therewith. Generally rectangular tag devices are attached to said articles for receipt of such signals and for reradiation thereof. The method involves the fabrication of the tag devices by the steps of: (a)...

La composition comprend (a) un composé polymérisable contenant au moins une double liaison insaturée éthyléniquement, (b) au moins un initiateur de photo-polymérisation choisi parmi des composés à base cétalique, (c) au moins un initiateur de photo-polymérisation choisi parmi des composés à base d'antraquinone, (d) un agent réducteur, et (e) une charge.; A light curing composition for dental resto...

La composition comprend (a) un composé polymérisable contenant au moins une double liaison insaturée éthyléniquement, (b) au moins un initiateur de photo-polymérisation choisi parmi des composés à base cétalique, (c) au moins un initiateur de photo-polymérisation choisi parmi des composés à base de thioxanthone, (d) un agent réducteur et (e) une charge.; A light curing composition for dental resto...

La composition comprend (a) un composé polymérisable contenant au moins une double liaison insaturée éthyléniquement, (b) au moins un initiateur de photo-polymérisation choisi parmi des composés à base cétalique, (c) au moins un initiateur de photo-polymérisation choisi parmi des composés à base d'éther de benzoine alkyle, (d) un agent réducteur et (e) une charge.; A novel light curing composition...

A composition comprising Portland cement and a hydrated alkali metal silicate powder is of utility in stabilising soil. Such a composition can be mixed with spoil removed from, say, a road trench, replaced and compressed to give a surface which is soon suitable for re-use. A composition may additionally comprise additives such as plaster of Paris, a thickener, a silicofluoride and/or a dust suppre...

1. A protective mat for covering articles which are to be explosively blasted, characterized in that it consists of a nonwoven textile sheet-like structure of synthetic continuous filaments or staple fibres, which on determination of the tension-elongation behaviour according to DIN 53857 has a tensile strength of 30-100 n/5 cm at 10 % elongation, a tensile strength of 100-400 N/5 cm at 30 % elong...

An automatic dispenser for dispensing solid chemicals used in cleaning processes which includes (i) means for initiating dispensing of a concentrated chemical solution, (ii) means for forming a concentrated chemical solution, (iii) means for directing the concentrated chemical solution to its utilization point, (iv) means for measuring the conductivity and temperature of the concentrated chemical ...