Abstract: A turbojet fan engine is disclosed having a fan or prop fan which blows air into a secondary channel and an external shroud for the turbine and the secondary channel, in which the front end of the shroud is formed with an inlet lip and the rear end of the shroud is formed in a nozzle-like, pointed manner and at least one end of the shroud is changed, with respect to its effective profile geometry, by means of air under pressure which is taken from the engine and blown out at the appropriate end of the shroud.

Abstract: A refrigerant or coolant compressor of the radial type with an impeller hng a plurality of vane elements can be used for compressing water vapor as a refrigerant or coolant under vacuum conditions. The impeller of the compressor is constructed to produce a high volume flow rate at the required compression ratio, in view of the low density of water vapor as the preferred flow medium. The impeller has sufficient strength to operate at the required high circumferential velocities. The impeller includes vane elements, disk elements, vane support elements and a hub. The vane elements are individually connected to the hub by the support elements. The support elements may be either ring-shaped elements connecting a rear surface of the disk elements to the hub, or may be pin-shaped insert members connecting the root of each vane element to the hub. The components of the impeller are made of a polymer composite material reinforced preferably with carbon fibers.

Abstract: Compounds of formula I ##STR1## wherein R.sup.1 and R.sup.1' are identical or different and represent hydrogen, an alkyl radical or alkoxy radical having 1-4 carbon atoms, the allyl group, a halogen atom or the nitro group, R.sup.2 represents an acrylic acid radical or an acrylic acid nitrile radical of the formulae ##STR2## wherein R.sup.5 represents hydrogen, an alkyl radical having 1-5 carbon atoms, an aryl radical or aryl-lower alkyl radical either unsubstituted or substituted by lower alkyl or alkoxy, R.sup.6 represents hydrogen or an alkyl radical having 1-8 carbon atoms, R.sup.7 represents hydrogen, a lower alkyl radical or an aryl-lower alkyl radical, R.sup.3 and R.sup.4 represent together with the nitrogen atom a heterocyclic ring with 5-7 members being optionally substituted by C.sub.1 -C.sub.4 alkyl, in which ring one carbon atom may be replaced by one oxygen atom, sulfur atom or one further nitrogen atom, the latter may be substituted, or wherein R.sup.3 represents hydrogen and R.sup.

Abstract: Novel peptide derivatives and a method of preparing the same are described. These compounds are useful in the diagnosis and treatment of hypertension.

Abstract: Cyclic 2',3'-ethers of 3-hydroxy-14,15.beta.-oxido-14.beta.-bufa-4,20,22-trienolide, 3.beta.-(.alpha.-L-rhamnopyranoside) and process for preparing them. The compounds have a strongly positive inotropic activity and may be used in the therapy of cardiac insufficiency.

Abstract: Digoxigenine-3-[2', 3'-didesoxy-glycosides] of the formula ##SPC1##In which R.sup.1 is the digoxigenine radical and R.sup.2 is hydrogen, methyl or --CH.sub.2 OH, which are prepared by a reaction of a digoxigenine-12-monoacylate with an acylated 1,2-glycal, a catalytic hydrogenation of the 12-acylates obtained and a subsequent hydrolysis. The products have a cardiotonic, diuretic and especially venotonic activity.