Abstract: Various embodiments include a microelectromechanical switching element. The element may include: a substrate with a carrier layer, an electrically insulating layer, and a semiconductor layer; a deflectable bending element formed by a freed subregion of the semiconductor layer; and a cover substrate connected to the carrier substrate. The carrier layer defines a first cutout in the region of the bending element. The cover substrate comprises a second cutout and/or an encircling spacer layer in the region of the bending element. The first cutout and the second cutout define a superordinate hollow space in which the bending element is arranged so as to be deflectable. The superordinate hollow space is delimited by the carrier layer and by the cover substrate to provide a hermetically encapsulation from the external environment.

Abstract: This invention is generally related to develop engineered nanobubbles to deliver sanitizers, and antimicrobials to microorganisms in water, contact surfaces as biofilm, wound, and food material, as well as synergetic combinations development with other processing technologies. The invention provides opportunity for reducing pathogenic bacteria rapidly and more effectively, with less chemical application.

Abstract: In a device (1) for holding objects (2) consisting of: a plate-shaped support frame (4) in which a plurality of accommodation openings (5) are incorporated, and a cage (6) suitable for accommodating the respective objects (2), which cage (6) has four side walls (71 to 74) extending perpendicular to one another and a base (8) arranged between them, the cage (6) should be able to be connected to the support frame (4) as quickly as possible and at the same time a reliable and permanent operative connection between the cage (6) and the support frame (4) should be achieved.

Abstract: In a device (1) for holding objects (2) consisting of: a plate-shaped support frame (4) in which a plurality of accommodation openings (5) are incorporated, and a cage (6) suitable for accommodating the respective objects (2), which cage (6) has four side walls (71 to 74) extending perpendicular to one another and a base (8) arranged between them, the cage (6) should be able to be connected to the support frame (4) as quickly as possible and at the same time a reliable and permanent operative connection between the cage (6) and the support frame (4) should be achieved.

Abstract: The invention relates to a process for distillatively preparing TDA from a reactant stream comprising TDA, high boilers and low boilers in a dividing wall column in which a dividing wall is disposed in the longitudinal direction of the column to form an upper combined column region (2), a lower combined column region (3), a feed section (4) having a rectifying section (5) and stripping section (6), and also a withdrawal section (7) having a rectifying section (9) and stripping section (8), which comprises the following steps: a. feeding the reactant stream (13) into the feed section (4) of the dividing wall column (1); b. drawing off a low boiler fraction via the top of the column (11); c. drawing off TDA via a side draw (14) in the withdrawal section (7) of the dividing wall column (1); d. drawing off a low boiler fraction via the bottom of the column (12).

Abstract: A continuous process for preparation of a polyether polyol in a reactor includes introducing an initial starter/catalyst mixture into the reactor. The initial starter/catalyst mixture comprises an initial starter and a catalyst with the catalyst selected from aluminum phosphate catalysts and/or aluminum phosphonate catalysts and/or residues of these catalysts. In this continuous process, one or more alkylene oxide is continuously introduced into the reactor. Additional amounts of the catalyst and a continuous starter are also continuously introduced into the reactor. The polyether polyol prepared herein is continuously withdrawn from the reactor.

Abstract: The present invention relates to a process for preparing isocyanates by reaction of amines with phosgene in a reactor and subsequent separation of the isocyanate from the reaction mixture leaving the reactor and purification of the isocyanate, wherein the separation and purification of the isocyanate is carried out in a column having a pressure at the top of 1-950 mbar, preferably 5-50 mbar, particularly preferably 10-20 mbar, and a temperature at the bottom of 90-250° C., preferably 120-170° C., particularly preferably 130-150° C., and the pure isocyanate stream is preferably taken off in liquid or gaseous form at a side offtake of the column.

Abstract: A process for preparing methylenedianiline by reacting aniline with formaldehyde in the presence of acid catalysts comprising, in a semicontinuous process, introducing aniline with or without acid catalyst, feeding formaldehyde with or without acid catalyst through a mixing element into a circuit in which aniline with or without acid catalyst and with or without previously added formaldehyde is circulated and, after feeding in at least 50% of the total amount of formaldehyde to be fed in, heating the reaction mixture to a temperature above 75° C. In addition, the invention relates to a process for preparing polyisocyanates by phosgenation of amines obtainable in this manner and to the polyisocyanates obtainable by this process.

Abstract: In a gas turbine combustion chamber with an annular flame tube, the latter is essentially composed of wall pieces (18) which overlap in the circumferential direction. The wall pieces (18) are elements, curved in the turbine axial direction, the cooling air being directed in a circumferential direction along the external sides thereof facing towards the collector volume (6). The cooling air flowing out of the overlap gaps (22) is deflected in a cascade (29) before entry into the combustion volume (15).

Abstract: A vane carrier (1) is axially located in an upper casing part (2) by means of a wedge (3). On the one hand, axial location, attainable by simple means, of the vane carrier (1) is desirable after the assembly of the upper casing parts (2). On the other hand, there is a requirement for easy release of the upper casing part (2) during the dismantling of the latter. During the assembly of the upper casing part (2), the wedge (3) is pulled tight against the vane carrier (1) by means of a screw (8). The vane carrier (1) is axially located in the upper casing part (2) by contact of the wedge contact surfaces (3', 3") with the surface (5) of the vane carrier (1) and with the surface (2") of the upper casing part (2). During dismantling of the upper casing part (2), the screw (8), and therefore the wedge (3), is loosened.

Abstract: Apparatus for rotating a shaft of a turbine is disclosed. This apparatus includes a ratchet wheel which is connected to the shaft, and a pawl which engages the teeth of the ratchet wheel. The teeth of the ratchet wheel have bearing surfaces with convex curvatures, while the pawl has a contact surface which also has a convex curvature.

Abstract: An axial thrust bearing includes a plurality of circumferentially arranged segments. The segments are constrained in the circumferential direction by means of support plates disposed therebetween. The segments are elastically supported by means of individual spring elements mounted in a bearing body. The segments are provided with support ribs having tilting edges. The support ribs are supported between the support plates, and the tilting edges are supported against the spring elements. As a result, friction between the segments is minimized.