Polymers are produced in a stirred bed or gas fluidised bed polymerisation zone of growing polymer particles by (1) introducing a stream of monomer(s), and opt. inert gas(s) or liq(s)., into the polymerisation zone; (2) continuously or intermittently introducing a catalyst; (3) continuously or intermittently withdrawing polymer; and (4) continuously withdrawing unreacted gases, compressing and coo...

A metallized ceramic substrate having a smooth plating layer, comprising a ceramic substrate comprising aluminum nitride as a main component; a tungsten- and/or molybdenum-based metallized layer formed on at least one face of the ceramic substrate and a nickel-based plating layer which is formed on the metallized layer and has a thickness of not greater than 2 .mu.m and a surface roughness (Ra) of...

A method for preparing molded articles of a cross-linked polyolefin involves mixing polyolefin granules comprising polyolefin granules containing a hydrosilylation catalyst, polyolefin granules containing the copolymer of an alkenylsilane and an olefln, and if necessary, polyolefin granules containing neither the hydrosilylation catalyst nor the copolymer of the alkenylsilane and the olefin, and t...

A jacketing system automatically interfaces dissimilar program units during program execution on a computer system. Means are provided for detecting a call for execution of a second program unit having a second call standard form a first program unit having a first call standard during execution of the first program unit on the computer system. A procedure descriptor is used in the code for the fi...

A process for treating brass plumbing components to reduce leachable lead when the component is subsequently exposed to water includes exposing the brass component in an aqueous solution containing a desired concentration of chloride and pyrophosphate, with the chloride ion promoting the dissolution of lead from the brass component and the pyrophosphate ion preventing saturation of the solution wi...

There is disclosed a process of dezincifying the flow of material at the operation of a plant for the production of pig iron including a direct reduction shaft furnace and a meltdown gasifier. The crude reducing gas drawn off the meltdown gasifier is dedusted in two steps. In the first step zinc-poor coal dust is separated in a cyclone operated at a higher temperature, which is recycled into the m...

Highly pure tetrachloro-1,4-benzoquinone is prepared by the action of chlorine and hydrochloric acid on hydroquinone, characterised in that the 1.9- to 2.1-fold molar amount of gaseous chlorine is allowed to act, at temperatures from 5 to 15 DEG C, on 1 mole of hydroquinone in the 6- to 7-fold molar amount of 30% to 37% hydrochloric acid, the suspension obtained, which essentially contains the 2,5...

The invention relates to a prefabricated joint structure for joining an essentially wooden elongated beam (2) or similar to at least one other beam (2) over a predetermined length (A) of a relatively short joint portion (4) in the beam, the joint (1) being accomplished by means of pins, bolts or similar jointing means (5) penetrating the beam or beams. In each joint there are at least two jointing...

The invention relates to a prefabricated joint structure for joining an essentially wooden elongated beam (2) or similar to at least one other beam (2) over a predetermined length (A) of a relatively short joint portion (4) in the beam, the joint (1) being accomplished by means of pins, bolts or similar jointing means (5) penetrating the beam or beams. In each joint there are at least wo jointing ...

Production of tetrafluoroethylene and hexafluoropropylene in very high combined selectivity by pyrolysis of chlorodifluoromethane, optionally using gaseous diluent wherein the pyrolysis is effected under substantially isothermal and uniform conditions, the reaction temperature is within the range 750-980 DEG C (preferably 800-980 DEG C), and the gaseous residence time is within the range 1 to 50 m...

In an electro-optical magnetic field sensor, a beam of polarized light, generated by a laser diode, strikes the interface between two prisms, formed by a layer of liquid crystal. The light is refracted or completely reflected, according to whether a magnetic field is present or absent respectively. The refracted light beam is detected by an electrical signalling circuit located after the second pr...

Kit for the fusion of fixed prostheses in dentistry, comprising: a baseplate 1 with a plurality of concentric circular grooves 3, a plurality of standard cylinders 7 of various diameters which can each be inserted into one of the aforesaid grooves 3 in the plate, a plurality of wedge shapes 11 hooked onto the upper edge 15 of one of the said cylinders 7 and projecting within them, these wedge shap...

Monitoring and regulating a reactor for the biological treatment of effluents involves constructing the reactor so that the four basic reaction processes created by the microbiological material contained in a single vessel are effected alternately during three oxygenation steps to stepwise remove contaminants or particles from the cloudy effluent. The method is pref. based on redox reactions which...

Ski boot in left and right combination, each one having a smooth sole of plastic or metallic material, rounded at the front and rear ends, having steel sheets integrated in the lateral extremities of the sole. There is provided a mechanism for rear lifting of the boots, which can be operated by lever, to allow the wearer an easy movement over any type of ground. The boots allow one to exercise and...

A set of composite metal-wood sections (1; 2) for door- and window-frames with a high degree of thermal insulation is formed by outer sections in metal (3; 35) and inner panelling elements in wood (4; 40). The panelling elements (4; 40) are joined to the metal sections (3; 35) by means of strips (5) and nogs (50) of plastic material that also have a function of thermal insulation. In addition an o...

Use of an elder decoction for preparing a medicament for the lesions treatment, in particular burns, sores, solar erythemas, on the human or animal body, wherein said decoction is obtained from elder branches, preferably two-years-old branches, submitted to boiling in water for a time generally from 15' to 10 hours, preferably for times from 1 to 2 hours, then it is cooled and the decoction is rec...

Laminate comprising at least one metal layer, in particular for foodstuffs, which is capable of withstanding heating and cooking operations without any signs of deterioration or interaction with the foods, characterised in that the metal layer is coupled to a film of heat-resistant polymer material which is chemically highly inert and has the best possible heat- welding properties through an adhes...

Improved element for clamping of pipes 1, comprising at least an open annular portion 2 integrated with a dowel 4, having one or more perforated and overlapping boxlike seats 6, 6', produced near the opening 2', for the press- fitting in the dowel 4 of a screw 8 made of plastic with thread extending along the entire shaft or a portion thereof. Inside said seat 6' there are formed two opposite and ...