Abstract: A diode laser arrangement includes at least one emitter, first and second cooling devices and a first connecting layer. The emitter is configured to emit a laser beam and is disposed between the first and second cooling devices. The first and second cooling devices are each configured for cooling the emitter. The emitter is connected to the first cooling device by the first connecting layer, and the first connecting layer has a connecting material or is composed of a connecting material selected from a group including gold, a gold alloy, silver, a silver alloy, a silver sintered material, copper, a copper alloy, nickel, a nickel alloy, palladium, a palladium alloy, platinum, a platinum alloy, rhodium, a rhodium alloy, iridium, an iridium alloy, germanium, a germanium alloy, tin, a tin alloy, aluminum, an aluminum alloy, indium, an indium alloy, lead and a lead alloy.

Abstract: A cushion has a cushion core, particularly made of a foam material, and an air-permeable and moisture-permeable covering layer that covers the core. To improve the climate comfort by ensuring good removal of moisture from the area between covering layer and cushion core, longitudinal and transverse grooves, spaced apart from one another, are formed in the surface of the cushion core covered by the covering layer. These grooves are open toward the covering layer and intersect one another. In addition, the cushion core is provided with channels which pass through the entire thickness of the core and which, at one end, open out at the points of intersection of the longitudinal and transverse grooves and, at the other end, open freely to the outside of the cushion core.

Abstract: The invention relates to a method and apparatus for heat exchange, especially for cooling at solid surfaces. At the solid surfaces, a locally uniform convective heat exchange is achieved. According to the invention, a sink flow is superimposed on a circular flow of a fluid in a flow chamber (1) at a surface of a heat-conducting solid wall (9) by means of a distributor, forming a vortex sink flow. The heat exchange surface of the component (9) to be cooled is at the same time the base plate (8) of a flow chamber (1).

Abstract: For the recording of local boundary-layer flow-line directions in liquid media by means of a photographic layer,(a) small reagent depots or deposits, with a volume of about 0.2 mm.sup.3, of a water-soluble substance reactive to silver ions ("chemical flow line indicators") are applied in raster fashion to the surface which is to be exposed to the flow and which surface is previously coated with a dry or swelled photographic sheet film,(b) the reagent deposits are covered with an inert layer which is soluble in the liquid flow medium,(c) the surface so prepared is exposed to the flow of an aqueous flow medium, and(d) the film is developed according to conventional means.The reagent deposits, which may be present as a paste, can contain a precipitation agent for silver ions. The deposits can be applied as a dot raster to the surface which is to be exposed to the flow (and which is coated with a photographic film) by means of screen printing or by means of a hole raster template.

Abstract: The disclosed method relates to a method for recording flow boundary layers in liquid media by photochemical means. According to the invention, surfaces which can be developed in a plane and to which a photographic film sheet is cemented are exposed under steady-state conditions to the flow of a liquid medium containing a dissolved agent reacting with the photo gelatin layer. The liquid medium may contain agents furnishing HS-ions or agents capable of dissolving silver halide or reducing silver halide. If a photographic film sheet is used, the silver ions of which are reduced to silver, the flow exposure is performed with an agent having oxidizing and dissolving action. With the method disclosed, half-tone photograms of flow boundary layers in liquids can be recorded.