摘要:
In a method for manufacturing a cylindrical high-frequency shield of a cylindrical gradient coil for a magnetic resonance system, a number of planar shield elements are placed adjacent to one another on a cylindrical support, together with a solder band or solder strip on the support. The segments or elements are inductively soldered together by an inductive soldering device that moves along a longitudinal axis of the cylindrical support.
摘要:
Base compositions for addition-crosslinking silicone compositions are continuously produced by, in a first stage, homogeneously mixing and kneading organopolysiloxanes and flowable prehydrophobized oxidic reinforcing fillers in a continuous kneading machine with kneading chambers arranged alongside one another. In a second, downstream, stage of the process, the compositions produced in the first stage are subjected to aftertreatment in a mixing apparatus in which the compositions have been subjected to a mixing procedure with introduction of shear force.
摘要:
A fuel-filler inlet for motor vehicles comprises a closure neck, an insert associated with the closure neck, a filling chamber downstream of the insert, and a filling tube downstream of the filling chamber which leads to a fuel tank. In order to achieve good guidance of the fuel nozzle, reliable response of the expansion port and ventilation during the fuel-dispensing operation, a collar is provided between the filling chamber and filling tube, the internal diameter of which is somewhat larger than that of the opening tube of a fuel nozzle. The collar provides through-passage openings which, with the fuel nozzle inserted, produce a flow connection between the filling tube and filling chamber.
摘要:
A gradient coil assembly for an NMR tomography apparatus has at least one gradient coil and at least one cooling structure, the cooling structure including at least one flexible cooling conduit for a cooling medium, this conduit being arranged on a flexible carrier. In a method for producing such a gradient coil assembly, a gradient coil and a cooling structure are flexibly attached to a flexible carrier, with the cooling structure being in thermally conducting contact with the gradient coil.
摘要:
The invention relates to low-viscosity, aqueous coolant brines based on inhibited alkali metal acetates and/or formates having improved corrosion protection, wherein the coolant brines contain 0.2 to 5% by weight of alkali metal sulfites or pyrosulfites, in particular 1 to 2.5% by weight of these sulfites. The brines according to the invention furthermore contain 0.3 to 5% by weight of basic substances from the alkali metal carbonates, hydroxides, borates and phosphates group and also 0 to 0.3% by weight of alkali metal silicates and 0.02 to 0.2% by weight of stabilizers from the triazoles, benzimidazoles and/or mercaptothiazoles group. The novel coolant brines result in very low corrosion rates, in particular with steel and cast iron.
摘要:
Organopolysiloxane resin powders having a mean particle diameter (median value d.sub.50,3) of from 70 to 300 .mu.m and a proportion of resin particles having a diameter
摘要:
The present invention relates to compositions containing phosphonitrile chlorides and/or compositions thereof containing reaction products which accelerate the condensation and/or equilibration of organo(poly)siloxanes, halogen-free organic solvents and solubilizers and the use of such compositions in the condensation and/or equilibration of organo(poly)siloxanes.
摘要:
A solid pigment composition comprises an intimate mixture of a pigment and a copolymer of an alkyl or cycloalkyl methacrylate ester and a lesser amount of an aminoalkyl methacrylate ester. The compositions are compatible with a wide range of substrates such as paints, printing inks and bulk polymers.
摘要:
Biodegradable, frost proof heat-transfer fluid, use thereof in near-surface geothermal installations, and a concentrate: subject matter of the present invention is the use of a triazole-free composition which as well as water comprises a) 9.2% to 49.5% by weight of at least one C2 to C3 alkylene glycol, C2 to C3 polyalkylene glycol or glycerol, b) 0.1% to 4% by weight of at least one corrosion inhibitor, with the provisos that c) the composition is readily degradable biologically in accordance with test method OECD 301 A, d) the composition has an anaerobic biodegradability of at least 75% in accordance with test method OECD 311, e) the corrosion inhibitor or all corrosion inhibitors used are readily degradable biologically in accordance with OECD 301 A (for water-soluble corrosion inhibitors) or OECD 301 B (for corrosion inhibitors of low water-solubility), in near-surface geothermal installations as a heat-transfer fluid.
摘要:
Base compositions for addition-crosslinking silicone compositions are continuously produced by, in a first stage, homogeneously mixing and kneading organopolysiloxanes and flowable prehydrophobized oxidic reinforcing fillers in a continuous kneading machine with kneading chambers arranged alongside one another. In a second, downstream, stage of the process, the compositions produced in the first stage are subjected to aftertreatment in a mixing apparatus in which the compositions have been subjected to a mixing procedure with introduction of shear force.