Showing papers on "Active surface published in 1983"
TL;DR: In this article, a combined apparatus which enables the transfer of a catalyst sample from a high pressure reaction cell (~1 atm) into an ultrahigh vacuum chamber (<10−10 Torr) is described.
66 citations
28 citations
TL;DR: In this article, a surface with regularly distributed circular or rectangular catalyst islands in a plane has been investigated under the assumption that the adsorbed reactant diffuses to the boundaries of the islands and disappears there by a first-order reaction.
26 citations
Patent•
04 Apr 1983
TL;DR: In this paper, the authors proposed a block for partially limiting a radiation beam, allowing a first part of this beam to be limited corresponding to the first maximum half angle of opening, which is defined by a cylindrical active surface.
Abstract: The invention provides a block for partially limiting a radiation beam, allowing a first part of this beam to be limited corresponding to a first maximum half angle of opening. This rectilinearly movable block comprises a cylindrical active surface. Because of this active surface, said block defines new limits for the beam without modifying the starting orientation of this active surface in dependence on the positions which it may occupy through its rectilinear movement.
14 citations
Patent•
04 Nov 1983TL;DR: In this article, the surface of a homogeneous metallic carrier is reduced with hydrogen at a temperature at which the active metal is substantially not sintered, characterized in that the carrier is a web or felt of fibers with a diameter between 4 and 100 microns.
Abstract: A catalyst comprising a metallic carrier having a catalytically active metal-containing surface layer, the catalytic metal being other than a noble metal, whereby the catalytically active surface layer is formed out of a homogeneous metallic carrier by oxidizing in an oxidizing gas such as air and subsequently reducing with hydrogen the surface of the metallic carrier at a temperature at which the active metal is substantially not sintered, characterized in that the carrier is a web or felt of fibers with a diameter between 4 and 100 microns.
9 citations
Patent•
23 Aug 1983
TL;DR: An ultrasonic beam focusing device with a concave surface comprises a cylindrical housing, a circular piezoelectric polymer film, and a rigid polyurethane layer formed in tight contact with an electrode inside the housing at the side of an acoustically inactive surface.
Abstract: An ultrasonic beam focusing device with a concave surface comprises a cylindrical housing (14), a circular piezoelectric polymer film (11) curved to have a concave shape relative to an acoustically active surface thereof and having a pair of circular electrodes at two surfaces thereof, for generating an ultrasonic beam focused at a point and for transducing the received ultrasonic beam into electric signals, leads (13a, 13b) respectively connected to the electrodes, a rigid polyurethane layer (15) formed in tight contact with an electrode (12b) inside the housing at the side of an acoustically inactive surface of the piezoelectric polymer film, for absorbing an ultrasonic beam at the side of the acoustically inactive surface and for supporting the piezoelectric polymer film; and an insulating layer (16) formed in contact with an electrode (12a) for electrically insulating the electrode (12a).
6 citations
Patent•
29 Sep 1983
TL;DR: In this article, a plurality of hollow spherical glass particles are fixed by a layer of sodium silicate, intended to contact the melting metal, and the mold surface is coated with a plurality.
Abstract: The mold surface (4), intended to contact the melting metal, is coated with a plurality of hollow spherical glass particles (1), fixed by a layer (3) of sodium silicate.
5 citations
Patent•
11 May 1983
TL;DR: In this paper, a sensor is proposed for optically observing gases, in particular combustible gases of an internal combustion engine, which has an optical detector which is exposed to the gases.
Abstract: A sensor is proposed for optically observing gases, in particular combustible gases of an internal combustion engine, which has an optical detector which is exposed to the gases. In order to counteract the contamination of the detector occurring during operation, the detector is provided with an active surface having particle-repellent and catalytic properties. The proposed sensor can advantageously be used for the optical observation of a combustion chamber or of an exhaust system of an internal combustion engine.
2 citations