An aromatic polyimide separation membrane prepared by subjecting an aromatic polyimide membrane to fluorine treatment with an active fluorine is described. The aromatic polyimide separation membrane according to the present invention has an extremely high selectivity and gas permeability, and therefore, is useful as a membrane for separation of gas mixtures or liquid mixtures.

NIOBIUM-DOPED TITANIUM MEMBRANES A metal oxide particulate membrane is made more electrically conductive, and thus more suitable for electrochemical cells by the incorporation into the membrane of a dopant element. The dopant is dissolved in an alcohol and then incorporated in the sol-gel process used to form the particulate metal oxide membrane. The invention is exemplified by a niobium doped tit...

A method for organizing data in a memory so that fault tolerance of the memory is optimized. Reed-Solomon symbols are stored vertically in RAM devices and a block of data consisting of such symbols is distributed throughout an array of thirty-two RAM devices organized in two columns of sixteen.

ENVIRONMENTALLY SAFE METHOD FOR THE REMOVAL OF RESIDUAL POLYETHERS FROM AQUEOUS WASTE STREAMS An environmentally safe method is provided for the removal and disposal of residual water soluble polymers, particularly polyethers, from aqueous waste streams, wherein a pretreated inert inorganic substrate is contacted with the waste stream and the polymer contained therein adsorbed onto the substrate. ...

A multi-layered ceramic element which comprises a plurality of films or thin plates of ceramic and a plurality of inner electrodes which are alternatively arranged in layers, wherein the ends of the inner electrodes are exposed at side end faces of the multi-layered assembly and only the exposed portions of the inner electrodes and the ceramic surface in the vicinity of the exposed portions of the...

A process for treatment of waste aqueous process streams from industrial processes containing both cyanide ions and dissolved ammonia to reduce the cyanide content, comprising the consecutive steps: (a) adding a halogenating agent to the solution while maintaining the pH of the solution at greater than 7; (b) removing ammonia from the solution by aeration; (c) acidifying the solution to a pH of le...

The hydraulic damper cylinder (9) is divided into two cylinder chambers by a piston. Each cylinder chamber is provided with an electrically operated control valve (3,4). A power supply cable (1) for the first valve (3) is attached to the valve housing by a plug connection (7) with three conductors (5). An integral branch connection with two cables (6) is linked to the second valve (4) by a plug c...

An optical sensor device for recognizing optical irradiation and detecting its direction is constructed as a spherical-shell section from dielectric, optically transparent material. The irradiation penetrating into the spherical-shell section is reflected back and forth between the exterior and the interior surface or between a mirror and a thin shell via an air gap or vacuum gap, and is thus defl...

An apparatus and a method for the adhesive fixing of a joining part (11) to a resilient workpiece joining point (13) function in such a way that by means of a compensating device (20) the yielding of the joining point 13, due to the flexibility of workpiece 10, is determined according to distance and/or position change and is taken into account during the smoothing adapting of the joining point (1...

A centrifugal pump casing of a centrifugal pump, comprising a casing shell (1) accommodating a rotary impeller (8) therein and having as a basic circle an inner peripheral circle having a diameter greater than the diameter of the outer peripheral circle of the impeller (8) is disclosed. A bulged portion (1a) bulged radially outwardly is integrally formed on the outer peripheral wall of the casing ...

A centrifugal pump casing of a centrifugal pump, comprising a casing shell (1) accommodating a rotary impeller (8) therein and having as a basic circle an inner peripheral circle having a diameter greater than the diameter of the outer peripheral circle of the impeller (8) is disclosed. A bulged portion (1a) bulged radially outwardly is integrally formed on the outer peripheral wall of the casing ...

An angiographic adjuvant comprising a fat emulsion containing a compound having prostaglandin E1 activities, and an angiographic method using the adjuvant.

A thermoplastic blend useful for the preparation of molded articles comprising a rigid thermoplastic polymer and a tapered triblock elastomer of a monovinylidene aromatic monomer and butadiene having a ratio of monovinylidene aromatic monomer:butadiene of 10:90 to 60:40; average molecular weight from 50,000 to 135,000. The blend is easily prepared by extrusion blending or other techniques and does...

PCT No. PCT/SE90/00480 Sec. 371 Date Feb. 21, 1992 Sec. 102(e) Date Feb. 21, 1992 PCT Filed Apr. 4, 1990 PCT Pub. No. WO91/00424 PCT Pub. Date Jan. 10, 1991.A filter device, especially an intake air filter for internal combustion engines, comprises a cylindrical filter housing (1) with inlet and outlet openings (7, 6) for the medium. In the outlet opening, the pipe stub (11) is fixed with the aid ...

PCT No. PCT/SE90/00480 Sec. 371 Date Feb. 21, 1992 Sec. 102(e) Date Feb. 21, 1992 PCT Filed Apr. 4, 1990 PCT Pub. No. WO91/00424 PCT Pub. Date Jan. 10, 1991.A filter device, especially an intake air filter for internal combustion engines, comprises a cylindrical filter housing (1) with inlet and outlet openings (7, 6) for the medium. In the outlet opening, the pipe stub (11) is fixed with the aid ...

A filter device, particularly an intake filter for an internal combustion engine, comprises a cylindrical filter housing (1) with an inlet (7) and an outlet (6) for the medium. The housing encloses a replaceable, tubular filter element (2) at one end of which an outlet stub (11) is fixed. The stub protrudes through the outlet (6) in the housing.

A filter device, particularly an intake filter for an internal combustion engine, comprises a cylindrical filter housing (1) with an inlet (7) and an outlet (6) for the medium. The housing encloses a replaceable, tubular filter element (2) at one end of which an outlet stub (11) is fixed. The stub protrudes through the outlet (6) in the housing.

Low capacity and high power density electric battery which electrolyzes water in the charging phase to produce hydrogen and oxygen used as reactants in the discharging phase, which battery comprises an ion-ex- change membrane, separating two compartments, said compartments containing gas evolving positive and negative electrodes respectively far the evolution of oxygen and hydrogen during the char...

PHOTOELECTROCHEMICAL CELLS USING METAL OXIDE CERAMIC MEMBRANES A photoelectrochemical cell is made from a pair of electrodes placed in an ionic salt solution. The photoresponsive electrode is metal oxide semiconducting ceramic membrane. The advantageous porosity, and thus increased surface area, of the membrane make a solar cell of this design more efficient due to the larger contact area between ...

A point or surface on the base support (3) is raised sufficiently so that the underside of the tile (1) rests against this point or surface. The distance to a stop heel formation (5) on the tile which also rests on the base support is at least 15 mm calculated in the tile longitudinal direction.