摘要:
The invention concerns a separation column in microsystem technology for a gas chromatograph comprising a first substrate, a second substrate which is arranged on the first substrate, wherein a trench structure is provided in at least one substrate and the trench structure is sealed off relative to the environment, a stationary phase applied at least to parts of the trench structure, a gas inlet connected to the trench structure, and a gas outlet connected to the trench structure.
摘要:
A receiver for high frequency electromagnetic oscillations, having frequency readjustment with a voltage-control oscillator, includes a phase control loop for regaining the carrier in the signal path of the receiver. The phase control loop comprises a device for recovering the carrier, a phase-locked loop oscillator and phase detector which receives the output signal of the carrier recovery device and the oscillations of the phase-locked loop oscillator as a reference, and a demodulator which receives the modulated input signal and the output of the phase-locked loop oscillator.
摘要:
The invention relates to a plain bearing half liner for a crankshaft main bearing (24), with a slot (10) which extends in the circumferential direction over an angle of 90 to 170°, is closed at both circumferential ends of the plain bearing half liner and passes radially through the plain bearing half liner, and with an otherwise oil-groove-free sliding surface (11) on the inside of said plain bearing half liner.
摘要:
Non-aqueous dental adhesive comprising a mixture containing (i) one or more polymerizable monomers optionally containing an acidic group, (ii) a polymerization initiator, and (iii) a thermal polymerization inhibitor of the following formula (I) wherein R′1 represents a hydrogen atom, or a saturated hydrocarbon group having 1 to 18 carbon atoms. R′2, which may be the same or different if more than one R′2 is present, independently represent a saturated hydrocarbon group having 1 to 18 carbon atoms, and c represents an integer of from 1 to 4, and (iv) optionally an organic solvent.
摘要:
The invention relates to a plain bearing composite material with a supporting layer made of a copper alloy, and with a lining applied to the bearing metal layer. The copper alloy can contain 0.5 5% by weight of nickel, 0.2 to 2.5% by weight of silicon and =0.1% by weight of lead. The lining can be a sputtered layer that is applied without an intermediate layer. The invention also relates to methods for producing this composite material.
摘要:
Dental adhesive composition having a pH of at least 5, which comprises an aqueous solution containing (a) a polymerizable N-substituted alkyl acrylic or acrylic acid amide monomer; (b) a water-soluble polymerizable carboxylic acid; and (c) a water-soluble organic solvent.
摘要:
Dental composition comprising an aqueous mixture containing (i) a polymerizable acidic phosphoric acid ester monomer of the following formula (A): wherein a is an integer of from 1 to 10; R1 represents a hydrogen atom or a moiety of the following formula (Y) wherein X independently represent an oxygen atom, a sulfur atom, or a group NR, wherein R may be a hydrogen atom, a C1-6 alkyl group or an acyl group; L represents an (a+b)-valent organic residue containing 1 to 20 carbon atoms and optionally including ether, thioether or amino groups or further acidic groups, whereby the carbon atoms comprise at least a+b carbon atoms selected from primary and secondary aliphatic carbon atoms, secondary alicyclic carbon atoms, and aromatic carbon atoms, each of said a+b carbon atoms linking a phosphate or 2-(oxaallyl) derivative group; b is an integer of from 1 to 10; R2 which may be the same or different, independently may be hydrogen, an allyl group or a moiety R1 wherein b is 1; provided that at least one of R1 and R2 is not hydrogen; (ii) one or more polymerizable N-substituted alkyl acrylic or acrylic acid amide monomers; (iii) an organic water-miscible solvent and/or water; (iv) a polymerization initiator; (v) an inhibitor and/or a stabilizer; (vi) optionally an organic or inorganic acid; and (vii) optionally a filler and/or a fluoride releasing compound.
摘要:
The invention relates to a separating column, especially for miniaturised gas chromatograph. In addition to a micro-chromatograph provided with one or more inventive separating column. The inventive separating column prevents the known racetrack effect and can therefore be produced in a simple and economical manner. The separating column (1) comprises a channel (2) for a flow of fluid having analysate molecules. The flow of fluid comprises counter flowing curves (3, 4) with turning points (7, 8), the average diameter of the channel (2) is greater than the length of the path traversed by an analysate molecule when diffused between two turning points (7, 7a; 8, 8a).
摘要:
A bearing shell with at least one retaining cam which, when looking down on the partial surface of the bearing shell, has a rectangular external contour line and an indentation on the inside, the indentation being at its largest around the center (M) of the cam. The indentation, when looking down on the partial surface, has a curved contour line. The cam is made by being either hammered or pressed using a rounded blade.
摘要:
A multi-stage regulating valve is provided with a cylinder and an adjusting piston guided inside it to which a regulating pressure can be applied from one side and a return force from the other. Depending on the regulating pressure, the piston keeps at least one outlet aperture in the cylinder wall closed or partly or fully opens it and thus closes off a connection to the side of the piston to which the regulating pressure is applied or partly or fully opens it via the outlet aperture. To provide a multistage regulating valve which can alter the regulating characteristics over a wide range depending on the position of the piston even without the use of several return components, the piston consists of at least two partial pistons to which the regulating pressure can be applied, where the force of the return component can be applied to a first partial piston, whereby a follower interconnects the partial pistons in such a way that a return force is exerted on the second partial piston or other partial pistons via the first partial piston and the follower. The cylinder has at least one stop for the second or other partial pistons limiting the movement of the second or other partial pistons under the effect of the regulating pressure and against the action of the return component. The first partial piston is unaffected by the stop and remains movable against the return component if the regulating pressure increases further.