Abstract: A compressible and deployable helical antenna (2) includes a supporting structure (7) having a helical shape. The supporting structure (7) includes a core (18), especially of foamed material, and a carrier layer (19) of composite fiber material, the carrier layer (19) being located on the core (18). An electrically conducting layer (8) is located on the carrier layer (19). An antenna unit (1) includes the compressible and deployable helical antenna (2) and a reflector plate (3). The reflector plate (3) is connected to the helical antenna (2).

Abstract: A compressible and deployable helical antenna (2) includes a supporting structure (7) having a helical shape. The supporting structure (7) includes a core (18), especially of foamed material, and a carrier layer (19) of composite fiber material, the carrier layer (19) being located on the core (18). An electrically conducting layer (8) is located on the carrier layer (19). An antenna unit (1) includes the compressible and deployable helical antenna (2) and a reflector plate (3). The reflector plate (3) is connected to the helical antenna (2).

Abstract: N-Heteroaryl-N′-(pyrid-2-yl-sulfonyl)ureas, processes for their preparation, and their use as herbicides and plant growth regulators Compounds of the formula (I) in which R1—R4, A, n, m and w are as defined in claim 1, are suitable as herbicides for controlling harmful plants and can be prepared, inter alia, from the sulfonamides of the formula (II) by reacting them with carbamates R*O—CO—NR4—A.

Abstract: In a connecting element for multiple-sided, in particular three-sided lattice girders made of fibre composite material, tubes (6, 7, 8, 9) are provided and arranged so that one of these is in the centre and the others are evenly distributed around this tube receiving or forming a central member, are held together by a fibre ring winding (12) and held apart by a disc (16) provided in the central tube (6).

Abstract: In a flange unit for the active suppression of vibrations, in which the flange unit is arranged between a vibration generator and a rigid structure, the flange unit has two flanges (2, 3), between which an actively controllable pressure-generating element (50), at least two fiber composite loops (60) and a tube (30) are arranged.

Abstract: In a connection between round composite fiber rods or pipes positioned at an angle to one another there are provided angular connecting elements of which the angle corresponds to the angle between the rods to be connected, fiber helical windings in the region of the vertices of the angular connecting elements, respective arms of the connecting elements being arranged to be inserted in the rod or pipe ends. The angular connecting elements are fastened positively on a rod and/or rest frictionally in the rod ends. The fiber helical windings wrap around the angular connecting elements in their angled portions and connect them to one another. Fillers and/or adhesives fill the cavities which are formed at the rod or pipe ends.

Abstract: N-Heteroaryl-N'-(pyrid-2-yl-sulfonyl)ureas, processes for their preparation, and their use as herbicides and plant growth regulatorsCompounds of the formula (I) ##STR1## in which R.sup.1 -R.sup.4, A, n, m and w are as defined in claim 1, are suitable as herbicides for controlling harmful plants and can be prepared, inter alia, from the sulfonamides of the formula (II) ##STR2## by reacting them with carbamates R*O--CO--NR.sup.4 --A.

Abstract: A rod with a tubular, fibre-composite wall, cut into two parts has actively controllable, pressure- and tension-generating elements which are effective in an axial direction of the rod, provided therebetween. An exterior pressure-generating element, which effects an elongation, takes the form of a cylindrical ring and is disposed on the outside of the rod elements. For the cylindrical ring, stop shoulders are formed on the outside of each of the rod elements. A second force-generating element is disposed inside the rod. Disposed in each of the two rod elements are loops or bends which are axially fixed to the rod elements and are guided around the axially opposite ends of the second force-generating element so that they in each case overlap or extend around the end of the second element which is directed axially away from the rod element in which the loops are fixed. Upon elongation of the second element, tensile forces are exerted upon the two rod elements and draw said two rod elements together.

Abstract: A rod with a tubular wall made from carbon fibre composite material and having connecting elements arranged at both ends. The tubular wall is divided in the center of the rod and an actively controllable pressure element, which acts in the axial direction of the rod, is built into the rod and lies against the inner faces of thrust washers, whilst the end faces of the divided tubular wall rest against the outer faces of the washers. Over the region of the element on the outer face of the tubular wall there is disposed a sleeve which engages over and is glued to the adjacent ends of the rod.

Abstract: A rod connection arrangement includes a connection element for connecting a cylindrical reinforcing rod to a cylindrical main rod, with the reinforcing rod extending at an angle to the axis of the main rods. Each rod respectively consists of a core of compression material surrounded by a fiber composite wall having fabric layers with fibers that cross at an angle. The connection element consists of an arcuate body having a central axis and an inner surface with a radius substantially equal to an outer radius of the main rod. The arcuate body preferably extends over an arc of less than 360 degrees. The connection element further consists of an integrally formed joint plate projecting radially outwardly from an outer surface of the arcuate body. The joint plate is preferably formed by two layers of a fabric material imbedded in a rein matrix wherein fibers of the fabric layers cross at an angle of substantially .+-.45 degrees.

Abstract: Herbicide/safener combinations ofA) herbicides selected from the group of the 2-acylated 1,3-dicarbonyl compounds or salts thereof, andB) safeners B1 and/or B2 ##STR1## as they are defined in claim 1, are suitable for controlling harmful plants in crops such as cereals, maize and rice.

Abstract: Disclosed are compounds of the formula (I): ##STR1## The substituents are disclosed in the specification. The compounds are herbicidal safenets. Accordingly, processes for the preparation and use of the compounds of formula (I) are also disclosed.

Abstract: A framework is formed from a plurality of thin-walled, round composite fiber rods having a pressure-resistant foam core and walls. The walls include at least one layer of axially parallel fibers. The framework is constructed from strut rods, transverse rods and joint plates which are operative for connecting the strut rods to the transverse rods. The joint plates are formed from a composite fiber material. Axially parallel recesses are provided in the walls of the strut rods, and the recesses have a width corresponding to the thickness of the joint plates. The recesses extend diagonally through the foam core of the strut rods, and the joint plates are inserted into the recesses where they are glued in place. The transverse rods are provided with slots in the ends thereof. The joint plates are inserted into the slots and glued to join the strut rods to the transverse rods.

Abstract: The invention relates to novel herbicidal compounds of the formula I or I' ##STR1## in which X is an oxygen or sulfur atom,R.sup.1 is H, C.sub.1 -C.sub.6 -alkyl, C.sub.2 -C.sub.6 -alkenyl, C.sub.2 -C.sub.6 -alkynyl, C.sub.1 -C.sub.6 -haloalkyl, (C.sub.1 -C.sub.4 -alkoxy-C.sub.1 -C.sub.4 -alkyl, (C.sub.1 -C.sub.6 -alkoxy)carbonyl, aryloxycarbonyl, (C.sub.1 -C.sub.6 -alkyl) aminocarbonyl, arylaminocarbonyl, phenyl, substituted phenyl or acyl,R.sup.2 is phenyl or substituted phenyl,R.sup.3 independently of other radicals R.sup.3 is H or C.sub.1 -C.sub.5 -alkyl andn is an integer from 0 to 6.The herbicides are suitable for selectively controlling harmful plants in cereal crops.

Abstract: The invention relates to a process for the racemization of D-2-N-phenacetylamino-4-methylphosphinobutyric acid ##STR1## which comprises carrying out the racemization in glacial acetic acid and in the presence of acetic anhydride. The invention makes it possible to convert economically a fairly inactive herbicide into the racemic mixture which contains the highly active L form. The latter can be separated off from the racemized mixture by known methods.

Abstract: The invention is concerned with a rod shaped constructional element comprising a core of foam material at least one first layer of fibers mounted on said core, said fibers extending in a direction parallel to the axis of said core at least one second layer of fibers mounted on said first layer, said second layer of fibers crossing each other at an angle to said axis; and at least one disc element disposed transversely in said core.

Abstract: Method and device for the manufacture of rod-shaped constructional elements of large extension. A core of foam material, inherently stable at right angles to its longitudinal extension, is guided horizontally. At least one dry unidirectional layer of fibres is applied on to the surface of the core. The surface of the unidirectional layer of fibres is wetted with synthetic resin. At least one braided hose with dry fibres crossing one another at an angle is applied on to the wetted surface. The strand manufactured in this way is separated into predetermined sections. The separated strand is held in the desired configuration of the constructional elements during hardening of the synthetic resin.

Abstract: A removable core for use in the production of tubular structures from fibre einforced resin materials. The body of the core is composed of a foam material which softens or collapses under the action of heat sufficient to cure the resin material but is hard and cross-sectionally dimensionally stable under less heat than that. The core is provided on the outside with a heat shrunk plastic tube or hose which closely embraces the foam body and serves as a coating therefor, thereby enhancing the rigidity and stability of shape of the core and imparting thereto a smooth surface.