Abstract: A tire whose tread comprises as elastomer a styrene-butadiene or a styrene-isoprene co-polymer having a glass transition temperature above minus 50.degree. C., said composition having a rebound resilience of 55% or more.The glass transition temperature is preferably between minus 40.degree. C. and minus 25.degree. C. and the rebound resilience is preferably between 60% and 70%.

Abstract: A method and apparatus for improving signals used for detecting conductive bodies in an area by means of an airborne electromagnetic survey system, comprising the steps of generating and transmitting an AC primary field signal, the frequency spectrum of which comprises a DC component or a low frequency component, and radiating this primary field signal to the said area and receiving induced secondary field signals which are generated by the said conductive bodies and further comprising the step of processing the received secondary field signals and representing the processed signals in order to derive information whether or not conductive bodies in the said area are present.

Abstract: The invention relates to a cable cleaning and lubricating system comprising a chamber (5) adapted to surround a section of a cable (4) to be cleaned and to be displaced relative to the cable (4), nozzles (7) within the chamber (5) for directing jets of relatively high pressure cleaning liquid onto the surface of the cable (4), sealing means (6) at both ends of the chamber (5) and adapted to contact the cable (4), the chamber (5) being provided with an outlet (10) which is in communication with a vacuum pump for reducing the pressure in the chamber (5) to a value below atmospheric pressure. The invention relates furthermore to the use of this system for cleaning and lubricating a cable (FIG. 1).

Abstract: Rust preventive containing as binder agent a talloil pitch esterified by means of an alcohol and having an acid number between 0 and 15 mg KOH/g and a process for preparing a binder agent by esterifying a talloil pitch having an acid number between 17 and 50 mg KOH/g with one or more alcohols.

Abstract: Magnesium is produced by carbothermic conversion of magnesia in a process which comprises effecting the reaction in the presence of a liquid slag comprising oxides or mixed oxides and carbides of magnesium, calcium and aluminium in relative weight proportions, calculated as atomic metal:metal ratios, which by continued introduction of appropriate feedstock into the reactor are being kept within the following ranges(i) Mg:Ca from 0.28:1 to 1.34:1(ii) Al:Mg from 0.79:1 to 3.16:1(iii) Ca:Al from 0.48:1 to 1.50:1under the proviso that the total amount gramatom aluminium is less than 51% of the total amount gramatoms aluminium, calcium and magnesium contained in the slag.

Abstract: A process for preparing a compound according to formula I containing substantially equimolar amounts of the 1R cis S- and the 1S cis R-isomers (the cis-2 enantiomer pair) and substantially free of the 1R cis R- and the 1S cis S-isomers (the cis-1 enantiomer pair), ##STR1## wherein R.sup.1 and R.sup.2 are each independently selected from chlorine, bromine and methyl, which process comprises contacting the cis-1 enantiomer pair, alone or in the presence of the cis-2 enantiomer pair, with an organic amine base containing from 5 to 7 carbon atoms and being a secondary amine containing two branched alkyl groups or being a tertiary amine, and then separating off a solid compound containing the cis-2 enantiomer pair and substantially free of the cis-1 enantiomer pair, characterized in that the reaction mixture is in the form a solid-liquid slurry.

Abstract: A transmitter, to be used in an airborne or ground electromagnetic survey system for detecting conductive bodies in an area, said system being adapted to generate a frequency modulated signal and radiating it to the said area, the said transmitter being provided with a power supply means being adapted to be connected by switch means to at least two circuits, each circuit comprising a radiating means, said radiating means being adapted to be connected to the power supply means, in such a way that assembled radiation means are present, each circuit comprising a radiating means being connected by its own switch to the said power supply means.

Abstract: Process and apparatus for the combustion of coke present on solid particles from which hydrocarbons have been substantially removed by heating, and for the production of recoverable heat from hydrocarbon-bearing solid particles, in a series of at least two combustion stages.

Abstract: A generator for providing electric energy in a borehole during drilling thereof, the generator comprising an anchor which is movable in a reciprocating mode in response to pressure pulses in the drilling fluid caused by rapidly opening or closing a valve.

Abstract: Conductor pipes on an offshore drilling and production platform pass through openings in the decks of the platform. The openings are to be sealed off to prevent spreading of hot and/or noxious fluids from one deck to another. The sealing means consists of two annular elements arranged around a conductor and connected to the conductor and the deck, respectively, thereby forming an annular trough in which one of the elements protrudes. The trough is filled with a flexible substance, such as a silicone foam.

Abstract: The device comprises a control system (100) commanded by sensing means consisting of at least one optic fibre transmitting a radiation to at least one radiation detector, said sensing means co-operating with a rotating element driven by the engine, which consecutively intercepts the receipt of the radiation. The control system (100) determines the beginning and duration of injection at the injectors (11) incorporated in the fuel-transfer circuit (10), which circuit comprises two pipes, namely a fuel inlet pipe (19) and a fuel outlet pipe (20) which are interconnected and in heat exchange relation and are located at the back of each injector in order to obtain a closed transfer circuit and to ensure continuous circulation of fuel at the back of each injector, thus avoiding in-line vaporization of said fuel.

Abstract: A process for the removal of arsenic compounds from tungsten and/or molybdenum concentrates by selective extraction, characterized in that the concentrates are extracted with an aqueous solution of a ferric compound of a pH below 2.5 and a temperature of at least 60.degree. C.

Abstract: Hydrocarbons are extracted from a hydrocarbon-bearing substrate, e.g. shale oil, bituminous coal, tar sand, in the substantial absence of oxygen at temperatures above 400.degree. C., by passing substrate particles through a plurality of successive stages in which the substrate is mixed with a solid heat-bearing medium, the mixture being maintained in a fluidized-bed condition, and the liberated hydrocarbons being removed by passage of an inert stripping gas in cross-current flow with respect to the passage of the substrate particles. The average cross-sectional area of at least one or more of the stages subsequent to the first one is preferably smaller than the average cross-sectional area of one or more of the preceding stages.An apparatus for carrying out the process is described.

Abstract: A process for the preparation of pentavalent vanadium compounds by reprocessing acid extracts of vanadium-containing catalysts spent in the hydrotreatment of crude or residual oils, characterized in that extracts containing trivalent and tetravalent vanadium are oxidized at a pH between 0.5 and 2.6 with an oxygen-containing gas to form concentrates of tetravalent vanadium, after which oxidation is carried out at a pH between 2.6 and 4.0 with an oxygen-containing gas to form concentrates of pentavalent vanadium and in that solid vanadium compounds are subsequently recovered by separating them from the liquid phase.

Abstract: This invention relates to the preparation of cyclopropane carboxylic acid ester derivatives, which are useful as pesticides.There is provided a process for preparing a mixture of cis-isomers of a compound of formula ##STR1## wherein R.sup.1 and R.sup.2 are independently selected from chlorine, bromine and methyl, consisting predominantly of the 1R cis S- and 1S cis R- isomers, which process comprises dissolving a mixture of 1S cis S- and 1R cis R- isomers of the compound of formula I, alone or in the presence of 1R cis S- and 1S cis R-isomers, in an organic amine base containing from 5 to 7 carbon atoms and being a secondary amine containing two branched alkyl groups or a tertiary amine, crystallizing out from a resulting solution of cis- isomers of formula I in the organic amine base a 1:1 mixture of the 1R cis S- and 1S cis R- isomers, and evaporating off the organic amine base.

Abstract: This invention relates to the preparation of cyclopropane carboxylic acid ester derivatives, which are useful as pesticides.There is provided a process for preparing a 1:1 mixture of 1R cis S- and 1S cis R- isomers substantially free of 1S cis S- and 1R cis R- isomers of a compound of formula: ##STR1## wherein R.sup.1 and R.sup.2 are each independently selected from chlorine, bromine and methyl, which process comprises dissolving a mixture of 1S cis S- and 1R cis R- isomers of the compound of formula I, alone or in the presence of 1R cis S- and 1S cis R-isomers, in organic amine base containing from 5 to 7 carbon atoms and being a secondary amine containing two branched alkyl groups or a tertiary amine, and crystallizing out from the resulting solution of cis - isomers of formula I in the organic amine base a 1:1 mixture of the 1R cis S- and 1S cis R- isomers substantially free of 1S cis S- and 1R cis R- isomers.

Abstract: A closure device, which may serve as a bottle closure or as a sink plug, or may constitute a container such as for an air-freshener material, comprises a base and a lid, formed by a resiliently deformable disc, centrally resiliently mounted on a bridge spanning the base and capable of flexing reversibly between two stable dished conditions, respectively an externally convex closed form and an externally concave open form.

Abstract: Trans-cyclopropane-nitriles of the following general formula: ##STR1## can be converted into the corresponding cis-form by irradiating the trans-compound with light of wave-length in the range 260-450 nanometers in the presence of a photo-sensitizer the triplet state energy of which is in the range 220-330 kilojoules per mole.

Abstract: A process for the removal of arsenic compounds from tungsten and/or molybdenum concentrates by selective extraction, characterized in that the concentrates are extracted with an aqueous solution of a ferric compound at a pH below 2.5 and a temperature of at least 60.degree. C.

Abstract: Hydrocarbon-bearing substrate particles are pre-heated by heating the same with a solid heat-bearing medium by indirect counter-current flow using a series of heat transfer loops each containing a circulating heat transfer medium chosen such that the whole series permits a staged rise in temperature of the substrate particles and a staged drop in temperature of the solid heat-bearing medium. Preferably the heat transfer fluid in the loops circulates between the substrate and the hot spent substrate by means of the so-called thermosyphon effect.An apparatus for carrying out the method is described.