摘要:
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.
摘要:
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.
摘要:
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.
摘要:
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.
摘要:
A removable core for use in the production of tubular structures from fibreeinforced 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.
摘要:
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.
摘要:
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) ##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.
摘要:
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.
摘要:
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.
摘要:
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).