摘要:
The present invention relates to a nuclear spin tomography device comprising a basic field magnet, a whole body gradient coil system with an HF antenna (1) surrounded by a suspension tube (2) which surrounds and restricts an internal chamber, guide rails (7) being located in this internal chamber (5) on which a patient support (6) can be inserted into the internal chamber (5) via the front sides (3) of the one suspension tube end and an insert gradient coil (9) can be inserted into said internal chamber (5) via the front side (4) of the other suspension tube end, characterized in that,the supply lines (13)(14)(15) for the insert gradient coil (9) are routed into the interior of the internal chamber (5) and terminated there in a coupling element (17) in each instance, and the insert gradient coil (9) has the respective coupling element mating part (18).
摘要:
A process for the continuous production of organopolysiloxane compositions which vulcanize at elevated temperature and have a viscosity of at least 500 Pa·s at 25° C., involves mixing and homogenizing high-viscosity organopolysiloxanes and crosslinking additives in a kneading cascade having at least two kneading chambers arranged in series proximate one another, containing two axially parallel kneading tools which can be driven in the same or opposite directions, and which are connected to one another by means of openings transverse to the axes of the kneading tools, with the first kneading chamber having a feed opening and the last kneading chamber having a discharge opening, and the temperature in the kneading chambers containing crosslinking additives being not more than 95° C.
摘要:
A device for installation of a gradient coil unit into a magnetic resonance apparatus has at least one support unit and at least one carrier unit. The carrier unit is fashioned to carry the gradient coil unit, and the at least one support unit is supported thereon such that it can tilt on a connector.
摘要:
The invention relates to a securing part to prevent a screw connection working loose, in which a first part is screwed to a second part with a screw, with the securing part featuring attachment means for attaching the securing part to one of the parts or to the screw and being embodied such that in a secured state of the screw connection it is fixed spatially relative to one of the parts and relative to the screw. In one embodiment the securing part is screwed to the screw. The securing part is in this case U-shaped and grips two sides of the screw head and the two sides of the part adjoining the screw head, which for example is embodied as a cable shoe or the washer below it.
摘要:
The invention relates to a dynamic gas mounting of a motor spindle, with a rotating shaft 2 which is gas-mounted in a housing 3 in the radial and axial direction, at least one radial gas bearing 4 being present for radial mounting along the shaft 2 and at least two axial gas bearings 5, 6 being present for the axial mounting of the shaft 2, and the two axial gas bearings 5, 6 having different surface profiles 12 for generating a flow of the bearing gas in the axial direction 14 of the shaft 2 in order to vent the mounting.
摘要:
A gradient coil system for a magnetic resonance apparatus has gradient coils and at least one cooling tube for cooling the gradient coils using a coolant flowing through the cooling tube. The cooling tube is formed of a flexible thermoplastic material, augmented with a filler, and has a thermal conductivity greater than 0.5 W/mK.
摘要:
A process for the continuous preparation of addition-crosslinking silicone rubbers from a base composition containing at least one polyvinyl polysiloxane and at least 10% by weight, based on the liquid silicone rubber, of hydrophobicized filler, by removing the base composition from a container whose volume reduces proportionally with the amount removed, and conveying the composition by way of a pump with a positive pressure difference to two further pumps (4) which convey the base composition onward, so a component A is prepared continuously by admixing at least one metal catalyst with one stream of the base composition, and a component B is prepared continuously and simultaneously by admixing the crosslinker and inhibitor with a second stream of the base composition, where the metal catalyst, crosslinker, and inhibitor are fed by way of a feed unit which meters in each of the substances.
摘要:
To position and fix the gradient coil assembly in a basic field magnet assembly of a nuclear magnetic resonance tomograph, an annular clamp element is clamped on a surface of the gradient coil assembly between the gradient coil assembly and the basic field magnet assembly. The clamp element has a conical internal surface which is form-fittingly in contact with a similar surface of the gradient coil assembly, so as to provide a self-centering force on the gradient coil assembly and to maintain the gradient coil assembly with an annular gap between the external surface of the gradient coil surface and the interior surface of the basic field magnet assembly.
摘要:
The invention relates to a concentrate for a heat transfer medium for solar units, comprisinga) from 45 to 98% by weight of triethylene glycol and/or tetraethylene glycol,b) from 1 to 55% by weight of 1,2-propylene glycol and/or ethylene glycol, andc) from 1 to 6% by weight of corrosion inhibitors.The concentrate is used in admixture with water for heat transport in solar units.
摘要:
The organopolysiloxane compositions are prepared by mixing(1) organopolysiloxanes which contain on average at least 2 aliphatic carbon-carbon multiple bonds per molecule,(2) prehydrophobized oxidic reinforcing fillers having a carbon content, obtained by the hydrophobizing, of at least 0.5% by weight and(3) compounds which are chosen from(3a) silanol compounds of the formulaR--[SiR.sub.2 --O--].sub.a H (I)in whichR is identical or different monovalent, C.sub.1 - to C.sub.10 -hydrocarbon radicals which are free from aliphatic carbon-carbon multiple bonds anda has values from 1 to 10, and(3b) saturated C.sub.1 - to C.sub.18 -alkanols.