An NMR apparatus includes a depressurizing device for depressurizing an NMR probe, a gas supply device for supplying gas into the NMR probe to thereby pressurize the NMR probe, and a control device. The control device alternately repeats depressurization of the NMR probe, using the depressurizing device, and pressurization of the NMR probe, using the gas supply device. This replaces the gas in the NMR probe.

The invention relates to a sample cell for performing DNP-NMR measurements, for interchangeable use in an EPR microwave resonator, with the sample cell comprising a flat sample cavity for holding a liquid sample to be measured, wherein the flat sample cavity extends with a maximum length L and a maximum width W in a sample cavity plane, and extends with a maximum height H perpendicular to the sample cavity plane, with H≤ 1/15*L and H≤ 1/15*W, and an NMR coil wound around the flat sample cavity for generating an RF magnetic field B.sub.2, wherein a coil axis of the NMR coil about which the NMR coil is wound is oriented perpendicular to the sample cavity plane. The invention provides a sample cell which is easy to handle and improves the quality and the reproducibility of DNP-NMR measurements.

According to one embodiment, a magnetic resonance imaging apparatus includes processing circuitry. The processing circuitry acquires an ambient temperature relating to a magnetic resonance imaging examination and determines an interlock value of a specific absorption rate (SAR) in accordance with the ambient temperature.

According to one embodiment, a magnetic resonance imaging apparatus includes processing circuitry. The processing circuitry acquires an ambient temperature relating to a magnetic resonance imaging examination and determines an interlock value of a specific absorption rate (SAR) in accordance with the ambient temperature.

A drug delivery system including: an oblong housing including a setting structure to set a dose of a drug via an angular position; and a sensor structure to determine the dose, including a magnet and a magnetic sensor, arranged so that at least one of an angular position and a displacement of the magnetic sensor relative to the magnet may be determined as a function of the electrical resistance of the magnetic sensor. The sensor structure is arranged in relation to the setting structure so that the angular position of the setting structure is determined as a function of the angular position and/or the displacement of the magnetic sensor. A sensor structure is also described including: a flexible foil, including a magnetic sensor, in a cylindrical shape configuration comprising an axis; and a magnet arranged at a line parallel to or collinear with the axis.

An NMR apparatus having a magnet system for generating a homogeneous static magnetic field B.sub.0 along a z direction, with a sampling head (1) comprising an RF transmitting and receiving coil system (2) and an opening (3) extending in the z direction for receiving a sample tube (4) containing a sample substance to be analyzed by means of NMR measurement, a compensation element (5) being present which at least partially compensates for disturbances in the homogeneous magnetic field B.sub.0 due to the sample substance and the material of the sample tube at the sample end of the sample tube that protrudes farthest into the sampling head during measuring operation, is characterized in that the compensation element is arranged outside the sample tube protruding into the sampling head during measuring operation of the NMR apparatus and in the z direction below the sample end, and is mounted so as to be movable, in particular displaceable, in the z direction. Thus, the compensation element can nestle against the sample tube during operation without problem. In this way, the susceptibility jump and the resulting B.sub.0 field disturbance in the lower region of the NMR-active sample liquid caused by the lower end of the sample tube are effectively minimizable with particularly uncomplicated technical means.

An NMR apparatus having a magnet system for generating a homogeneous static magnetic field B.sub.0 along a z direction, with a sampling head (1) comprising an RF transmitting and receiving coil system (2) and an opening (3) extending in the z direction for receiving a sample tube (4) containing a sample substance to be analyzed by means of NMR measurement, a compensation element (5) being present which at least partially compensates for disturbances in the homogeneous magnetic field B.sub.0 due to the sample substance and the material of the sample tube at the sample end of the sample tube that protrudes farthest into the sampling head during measuring operation, is characterized in that the compensation element is arranged outside the sample tube protruding into the sampling head during measuring operation of the NMR apparatus and in the z direction below the sample end, and is mounted so as to be movable, in particular displaceable, in the z direction. Thus, the compensation element can nestle against the sample tube during operation without problem. In this way, the susceptibility jump and the resulting B.sub.0 field disturbance in the lower region of the NMR-active sample liquid caused by the lower end of the sample tube are effectively minimizable with particularly uncomplicated technical means.

Methods for determining a volume of stored gas within a rock sample includes loading a rock sample into an overburden cell. A hydrocarbon gas at a gas pressure is applied to the rock sample and a confining fluid at a confining pressure is applied to the overburden cell. The confining pressure and the gas pressure are increased until a first pressure and temperature condition is met. With the rock sample maintained at the first temperature and pressure condition, a nuclear magnetic resonance spectrometer is used to scan the rock sample and measure a hydrocarbon gas volume within the rock sample. This measured hydrocarbon gas volume is then corrected using a Real Gas Index to determine the volume of stored gas within the rock sample.

Methods for determining a volume of stored gas within a rock sample includes loading a rock sample into an overburden cell. A hydrocarbon gas at a gas pressure is applied to the rock sample and a confining fluid at a confining pressure is applied to the overburden cell. The confining pressure and the gas pressure are increased until a first pressure and temperature condition is met. With the rock sample maintained at the first temperature and pressure condition, a nuclear magnetic resonance spectrometer is used to scan the rock sample and measure a hydrocarbon gas volume within the rock sample. This measured hydrocarbon gas volume is then corrected using a Real Gas Index to determine the volume of stored gas within the rock sample.

A heater system includes a current source configured to generate an input current and to receive a return current. The system also includes a heater configured to generate heat in response to the input current. The system further includes a plurality of current lead wires interconnecting the current source and the heater and being configured to provide the input current to the heater and to conduct the return current from the heater. Each of the plurality of current lead wires is arranged on a separate substrate layer such that each of the plurality of current lead wires are each spaced apart from each other. At least one of the input current and the return current is divided to be conducted on two or more of the plurality of current lead wires.