Abstract: Burners operating with combustion air as the combustion-sustaining gas and a fuel, generally a vaporizable liquid fuel, have at least one ceramic body formed with passages for these two fluids allowing heat exchange through the walls separating these passages. According to the invention, these walls are porous so that fuel in the fuel passage can traverse the wall into an adjoining air passage by evaporization on the surface. The combustion air can be heated by recuperative heat exchange from exhaust gases of the combustion chamber. Burner heads of this type can be paired in mirror-symmetrical relationship.

Abstract: A burner head of ceramic materials through which the fuel (combustible) and the oxidizing agent (oxygen or oxygen-containing gas such as air) are passed from an inlet side to an outlet side, combustion being effected at the outlet side. According to the invention, the gas passages for the fuel and the oxidizing medium are of elongated cross section and parallel to one another, being offset in pairs so that indirect heat exchange is effected between the two mediums through the separating ceramic wall. The passages can be formed as rectangular-section channels which are closed at the top and bottom by ceramic plates.

Abstract: A heat exchanger of a ceramic body, or the like, having a plurality of elongate flow passages in parallel relationship with the placement of the passages staggered with respect to the opposite end cover walls of the ceramic body, transversely extending parts of both cover walls being absent to expose those staggered passages that pass closer to the respective cover wall, thereby to permit access for fluid media to the flow passages; particular characteristic features of the passages are disclosed.

Abstract: A heat exchanger element, especially of undulating or folded configuration aving an end closure thereon in the form of a band shaped in conformity with the heat exchanger element and sealingly connected thereto while the legs of the undulations of the band which face each other are also sealed together. In one form of the invention, the band is spaced from the end of the heat exchanger element and the open ends of the undulations are sealed as with solder.

Abstract: Elongated ceramic heat exchange units are arranged with each such unit axly oriented and all arranged parallel to each other in a ring surrounding the compressor, gas turbine and combustion chamber of a gas turbine motor. Each heat exchange unit has a multiplicity of rectangular slot channels through alternate ones of which the hot exhaust gas and the compressed air supply flow in counter-current. The cross sections of these channels all have their long dimension disposed substantially radially with respect to the axis of symmetry common to the principal components. The respective inputs for the two sets of channels are both from the inside of the ring arrangement but at opposite ends of each heat exchanger element; whereas the exit openings are in the end faces of the heat exchanger elements.

Abstract: Two identically folded strips enclose an intermediate space accessible at e edges of the strip, and the fold cavities opening to the outside of the strip structure are closed off at the strip edges and covered by outside cover plates over their central portions, so that one medium may be caused to flow through each of the sets of outside fold cavities and a third medium through the intermediate space. The third medium flows countercurrent to the direction of flow of the other two. Modules of four such matrices utilize inlet and outlet ducts so that the two or four matrices in a compact modular structure can be structurally repeated in accordance with the number of modules desired in the particular application. The inlet and outlet ducts have tapering flow cross-sections.

Abstract: Heat exchanger matrices of the folded strip type are set in an elongated V onfiguration inside a tubular casing. They are held in position by braces between opposite cover plates and between other cover plates and the casing, which braces also operate as partition walls for separating inlet and outlet channels of one of the media. The cooler of the media has inlet ducts downwards on the edges of the space inside the V and an outlet duct for upward flow at the center of the space inside the V. The other medium, which is hotter, but under less pressure, has inlet ducts with upward flow at the center of the spaces outside the V and outlet ducts with downward flow at the edges of the spaces outside the V. The hotter parts of the heat exchanger are in the middle of the structure. Bellows-type thermal expansion compensators seal the edges of the V against the casing.

Abstract: A heat exchanger arrangement for the exchange of heat between fluid media which the wall through which the heat is exchanged between the media is a pleated element which has a respective medium flowing along each side thereof, preferably in counterflow relation.

Abstract: Pharmaceutical dosage unit compositions containing as an active ingredient a compound of the formula ##SPC1##WhereinR.sub.1 to R.sub.3, which may be the same or different, represent hydrogen atoms, halogen atoms, hydroxy, trifluoromethyl, benzyloxy, acyloxy groups, alkyl groups with 1 to 6 carbon atoms, alkoxy groups with 1 to 3 carbon atoms, phenyl, cyclohexyl, or 2 of the radicals R.sub.1 to R.sub.3 together represents a methylenedioxy group,R.sub.4 represents a hydrogen atom or an alkyl group with 1 or 2 carbon atoms,R.sub.5 represents a hydrogen atom or an alkyl group with 1 to 3 carbon atoms andR.sub.

Abstract: This invention relates to cyclobutane derivatives having the formula ##SPC1##Wherein R.sub.1 to R.sub.3, which may be the same or different, represent hydrogen atoms, halogen atoms, hydroxy, trifluoromethyl, benzyloxy, acyloxy groups, alkyl groups with 1 to 6 carbon atoms, alkoxy groups with 1 to 3 carbon atoms, phenyl, cyclohexyl, or 2 of the radicals R.sub.1 to R.sub.3 together represents a methylenedioxy group,R.sub.4 represents a hydrogen atom or an alkyl group with 1 or 2 carbon atoms,R.sub.5 represents a hydrogen atom or an alkyl group with 1 to 3 carbon atoms andR.sub.