Abstract:
An apparatus for analyzing a measuring substance which is dissolved in a solvent, comprising a conduit (4) for transporting the dissolved measuring substance from a feed means (3) to a measuring location (12), wherein the feed means (3) is designed to optionally feed a solvent or dissolved measuring substance into the conduit (4), is characterized in that the conduit (4) is designed, at least partially, as a polycapillary area (9) which has N parallel connected capillaries (21a, 21b, 21c; 62a, 62b), such that the individual capillaries (21a, 21b, 21c; 62a, 62b) have identical flow times from the feed means (3) to the measuring location (12) and wherein N≧2. The apparatus improves the signal-to-noise ratio of the analysis.
Abstract:
A system and method are provided for controlling or automatically controlling the driving dynamics of a two-track, two-axle motor vehicle having only one driven axle, which, for the rolling moment support, has a system for changing the distribution of the wheel contact forces to the left and right wheel respectively of each axle. The fractions of the rolling moment support taken over by the front axle and by the rear axle are changeable as a function of the drive torque provided by the drive assembly of the motor vehicle. For this purpose, a desired wheel contact force for the driven wheels can be determined from the drive torque, and by way of this desired wheel contact force, the distribution of the rolling torque support can be determined. A change of the distribution of the rolling moment support as a function of the drive torque of the drive assembly is preferably carried out only if the otherwise available contact force would otherwise not be sufficient for the transmission of the drive torque to the road. A slip control may be superimposed on this pilot control, which slip control seeks to minimize the deviation between the determined rotational speed difference of the driven wheels and the rotational speed difference corresponding to the respective driving condition.
Abstract:
A method for coupling a gas chromatograph (21) to an NMR spectrometer, wherein the carrier gas present at the outlet of a separating column (23) of the gas chromatograph (21) including a sample contained in the carrier gas is supplied via a heated transfer line (1) to a collecting device (2) for the sample contained in the carrier gas, is characterized in that the carrier gas containing the sample is introduced into a collecting liquid (8) in the collecting device (2), and the sample is collected in the collecting liquid (8), wherein the collecting liquid (8) is suitable as an NMR solvent for the sample. The sample loss of the coupling method is reduced.
Abstract:
An electrode rod (1;21) for a pH meter, comprising a measuring end (2; 22) for immersion into a liquid test sample (31), wherein the measuring end (2; 22) has a pH measuring element, and wherein electrical feed lines (5) in the electrode rod (1;21) extend towards the pH measuring element, is characterized in that at least one capillary (8, 9, 10; 23) for feeding a liquid into the test sample (31) extends in the electrode rod (1; 21), and the at least one capillary (8, 9, 10; 23) has an outlet opening (11, 12, 13; 24) in the area of the measuring end (2; 22). The inventive electrode rod facilitates and accelerates preparation of liquid test samples, in particular, adjustment of a pH value for small amounts of test samples or narrow sample containers.
Abstract:
The invention concerns a method for spectrometric investigation of a plurality of samples dissolved in a solvent, comprising the following steps: (a) guiding a first solvent with a sample through an SPE cartridge (5) for concentrating the sample in the cartridge (5); (b) positioning the cartridge (5) in a carrier (4) for a plurality of cartridges (5); (c) repeating steps (a) and (b) for a desired number of samples; (d) drying the concentrated samples through removal of the residual first solvent, in particular, dehydration or evaporation; (e) dissolving each sample in a second solvent, transferring these dissolved samples from the cartridges (5) to a spectrometer and acquiring a spectrum of each sample. The method is characterized in that all samples are dried together in step (d) subsequent to steps (b) and (c) while the cartridges (5) with samples are positioned in the carrier (4). The drying process is thereby considerably accelerated in a straightforward technical manner.
Abstract:
A nuclear magnetic resonance (NMR) spectroscopy probe has a sample cell into and out of which a room temperature liquid sample may be directed. The cell is surrounded by a radio frequency coil that is used to perform NMR measurements of the liquid sample, and which is maintained at cryogenic temperatures. The coil is separated from the sample cell by a thermally insulative boundary, such as a vacuum. The sample may enter the cell through an input path, and may exit through an output path. The input path, output path and sample cell may be surrounded by a sheath through which flows room temperature gas. The ends of the sample cell may be tapered to promote thorough flow through the cell, and flow diverters may be included in the sample cell adjacent to the input and output paths to force flow to the outer wall of the sample cell.
Abstract:
The invention concerns an NMR sample holder for NMR samples with a short sample tube of constant diameter which is clamped in a largely gas-tight fashion and with a movable plunger and a rotor. The inventive device increases flexibility compared to conventional sample holders, reduces the vapor volume over the sample liquid in the sample tube and prevents deviations from precise orientation. The invention also concerns a method for simple and safe exchange of the sample tube thereby drastically minimizing loss through breakage.
Abstract:
An NMR sample holder comprises:a rotor 2,3 having a central bore 2e with an internal thread for at least a portion 2g of its length, ,a hollow cylindrical sample tube 5 having a closed end and an open end, and having an outer diameter of less than 3 mm, the diameter being such as to enable the sample tube 5 to be accommodated within the central bore 2e in the said rotor,a centring screw 7 having an external thread 7g adapted to engage the said internal thread 2g of the central rotor bore and a central bore 7e adapted to accommodate the sample tube and to centre the sample tube in the central bore of the rotor, anda sealing member 6, 6' which is a sliding fit on the sample tube 5 and adapted to form a seal with an internal surface of the central bore of the rotor and with the sample tube 5.
Abstract:
An NMR spectrometer (10) for the measurement of liquid samples having a probe head (20) exhibiting an upper and a lower support (21 or 22), a connector (5) for a feed conduit (15) for the introduction of a liquid sample (1) into the spectrometer (10) and a connector (6) for a drain conduit (16) for the drainage of the liquid sample (1) out of the spectrometer (10), a sample tube (3), arranged between the upper and the lower supports (21 or 22), for the acceptance of the fluid sample (1), whereby the one end of the sample tube (3) is connected to the connector (5) for the feed conduit (15) and the other end to the connector (6) for the drain conduit (16), exhibits, coaxially to the sample tube (3) a further tube (4) for the acceptance of a calibration fluid (2) which, on one end, is connected to an additional connector (7) for a feed conduit (17) to introduce the calibration fluid (2) into the spectrometer (10) and, on its other end, to an additional connector (8) for a drain conduit (18) to drain the calibration fluid (2) out of the spectrometer (10). In this manner, it is possible to measure the sample fluid (1) in a simple fashion, without the previous mixing of additives and, subsequent to the measurement, to regain the sample fluid in its original state, while allowing for the introduction of a calibration fluid (2) for field stabilization and for the quantitative comparison of line intensities.