Abstract: An electrical machine for a motor vehicle, having a rotor mounted rotatably about a rotational axis and has a hollow rotor shaft which encloses a shaft cavity, the hollow rotor shaft having an axial end with a shaft opening, a stationary lance guided through the shaft opening into the shaft cavity and has a fluid outlet opening, a cooling medium which is guided through the lance and sprayed via the fluid outlet opening onto an inner lateral surface of the hollow rotor shaft, an edge-sealed first outlet opening formed in a wall of the hollow rotor shaft, via which first outlet opening the cooling medium may escape from the shaft cavity, wherein, at a rotation speed n of the rotor of n?4,000 rpm over at least 15 seconds, an average film thickness dF of the cooling medium in the radial direction of the rotor is ?3 mm.

Abstract: In order to improve a refrigerant compressor of the type mentioned in the introduction such that it is ensured that, even in the event of a tilt along a longitudinal direction of the refrigerant compressor unit relative to a horizontal course of the longitudinal direction, lubricant can reliably be drawn off by suction out of the lubricant sump, in order to prevent excessive accumulation of lubricant in the lubricant sump, it is proposed that there should be provided on the bottom side of the motor compartment a receiving point that takes a form such that the receiving point supplies lubricant from the lubricant sump to the suction-removal unit.

Abstract: A refrigeration system, in particular a transport refrigeration system, comprising: a refrigerant circuit, which in particular works using CO2 as the refrigerant and in which there is guided a total mass flow of the refrigerant; a high-pressure-side heat exchanger arranged in the refrigerant circuit and cooling refrigerant compressed to a high pressure; at least one cooling stage which expands the principal mass flow from the intermediate-pressure collector to a low pressure in at least one cooling expansion member and in so doing makes refrigeration capacity available at a low-pressure-side heat exchanger; and a refrigerant compressor unit which compresses the principal mass flow from a low pressure to a high pressure, wherein the refrigerant compressor unit has a first compressor stage for compressing, to a medium pressure, the refrigerant of the principal mass flow supplied at low pressure, and a second compressor stage for compressing, to a high pressure, the refrigerant of the principal mass flow that ha

Abstract: A magnetic resonance apparatus with a safety structure for monitoring a safety-related function is provided. The safety structure includes a control path that is configured to control the safety-related function, and a first protect path and a second protect path. The first protect path and the second protect path are configured to acquire a safety-related parameter of the safety-related function. The first protect path is configured to identify a hazardous situation, independently of the control path and the second protect path, based on the safety-related parameter that the first protect path acquires. The second protect path is configured to identify a hazardous situation, independently of the control path and the first protect path, based on the safety-related parameter that the second protect path acquires. The first protect path and the second protect path are each configured to transfer the magnetic resonance apparatus into a safe state in a hazardous situation.

Abstract: Sub-diffraction limited magneto-optical microscopy, such as Kerr or Faraday effect microscopy, provide many advantages to fields of science and technology for measuring, or imaging, the magnetization structures and magnetization domains of materials. Disclosed is a method and system for performing sub-diffraction limited magneto-optic microscopy. The method includes positioning a microlens or microlens layer relative to a surface of a sample to image the surface of the sample, forming a photonic nanojet to probe the surface of the sample, and receiving light reflected by the surface of the sample or transmitted through the sample at an imaging sensor. The methods and associated systems and devices enable sub-diffraction limited imaging of magnetic domains at resolutions 2 to 8 times the classical diffraction limit.

Abstract: In a refrigerant compressor comprising an overall housing with a motor housing portion, in which there is arranged a motor chamber having, provided therein, an electric motor comprising a stator and a rotor, and with a compressor housing portion which has a compressor unit, in order to be able to mount the stator as easily as possible it is proposed that the stator is mounted in the motor housing portion by means of supporting elements inserted into the motor housing portion, which supporting elements on the one hand abut against a stator-receiving surface of the motor housing portion and on the other hand surround the stator inserted into the supporting elements on its outer side and support it spring-elastically relative to the stator-receiving surface.

Abstract: In order to improve a refrigerant compressor, comprising an overall housing with a motor housing portion and a compressor housing portion, which has a cylinder housing with a cylinder head, wherein the cylinder head has a cylinder head lower part arranged on the cylinder housing and a cylinder head upper part which closes off the cylinder head and has at least one outlet chamber integrated in the cylinder head upper part, in such a way that it is possible to provide optimal protection for the cylinder head, it is proposed that the cylinder head is covered by means of a hood which engages over the cylinder head upper part on an upper side facing away from the cylinder head lower part with a hood cover and over the cylinder head in the region of its peripheral side with a hood skirt surrounding the cylinder head.

Abstract: Sub-diffraction limited magneto-optical microscopy, such as Kerr or Faraday effect microscopy, provide many advantages to fields of science and technology for measuring, or imaging, the magnetization structures and magnetization domains of materials. Disclosed is a method and system for performing sub-diffraction limited magneto-optic microscopy. The method includes positioning a microlens or microlens layer relative to a surface of a sample to image the surface of the sample, forming a photonic nanojet to probe the surface of the sample, and receiving light reflected by the surface of the sample or transmitted through the sample at an imaging sensor. The methods and associated systems and devices enable sub-diffraction limited imaging of magnetic domains at resolutions 2 to 8 times the classical diffraction limit.

Abstract: A magnetic resonance apparatus with a safety structure for monitoring a safety-related function is provided. The safety structure includes a control path that is configured to control the safety-related function, and a first protect path and a second protect path. The first protect path and the second protect path are configured to acquire a safety-related parameter of the safety-related function. The first protect path is configured to identify a hazardous situation, independently of the control path and the second protect path, based on the safety-related parameter that the first protect path acquires. The second protect path is configured to identify a hazardous situation, independently of the control path and the first protect path, based on the safety-related parameter that the second protect path acquires. The first protect path and the second protect path are each configured to transfer the magnetic resonance apparatus into a safe state in a hazardous situation.

Abstract: A refrigeration system, in particular a transport refrigeration system, comprising: a refrigerant circuit, which in particular works using CO2 as the refrigerant and in which there is guided a total mass flow of the refrigerant; a high-pressure-side heat exchanger arranged in the refrigerant circuit and cooling refrigerant compressed to a high pressure; at least one cooling stage which expands the principal mass flow from the intermediate-pressure collector to a low pressure in at least one cooling expansion member and in so doing makes refrigeration capacity available at a low-pressure-side heat exchanger; and a refrigerant compressor unit which compresses the principal mass flow from a low pressure to a high pressure, wherein the refrigerant compressor unit has a first compressor stage for compressing, to a medium pressure, the refrigerant of the principal mass flow supplied at low pressure, and a second compressor stage for compressing, to a high pressure, the refrigerant of the principal mass flow that ha

Abstract: For creating a storage unit comprising a container housing enclosing a storage volume for receiving freight and a gaseous medium surrounding said freight, said storage unit further comprising a tempering system provided with a tempering unit associated with said storage volume for maintaining a flow of said gaseous medium circulating in said storage volume and passing through said tempering unit in order to be maintained at a defined or set temperature, said tempering unit comprising an internal heat exchanger arranged in said flow of gaseous medium passing through said tempering unit, said tempering system being provided with a refrigerant circuit comprising said internal heat exchanger, an external heat exchanger exposed to ambient air surrounding said container housing which operates reliably and cost efficient under the aforementioned condition, as well as a compressor unit for compressing refrigerant, and said tempering system being further provided with an engine for driving said compressor unit in an i

Abstract: For creating a storage unit comprising a container housing enclosing a storage volume for receiving freight and a gaseous medium surrounding said freight, said storage unit further comprising a tempering system provided with a tempering unit associated with said storage volume for maintaining a flow of said gaseous medium circulating in said storage volume and passing through said tempering unit in order to be maintained at a defined or set temperature, said tempering unit comprising an internal heat exchanger arranged in said flow of gaseous medium passing through said tempering unit, said tempering system being provided with a refrigerant circuit comprising said internal heat exchanger, an external heat exchanger exposed to ambient air surrounding said container housing which operates reliably and cost efficient under the aforementioned condition, as well as a compressor unit for compressing refrigerant, and said tempering system being further provided with an engine for driving said compressor unit in an i

Abstract: A power supply for an elevator drive includes a voltage input, a comparator for comparing the input voltage with a predetermined threshold, a transformer having a primary winding and a secondary winding connected to the elevator drive. The transformer has a single tapped primary winding. When the input voltage exceeds the predetermined threshold input, the comparator output causes power to be supplied to the primary winding via one of an end of the winding or the tapping of the winding, and when the input voltage is below the predetermined threshold, input power is supplied to the primary winding via the other of the end of the primary winding and the tapping of the winding.

Abstract: A power supply for an elevator drive, comprising a voltage input, a comparator for comparing the input voltage with a predetermined threshold, a transformer having a primary winding and a secondary winding connected to the elevator drive; where the transformer has a single tapped primary winding and wherein, when the input voltage exceeds the predetermined threshold input, the comparator output causes power to be supplied to the primary winding via one of an end of the winding or the tapping of the winding, and when the input voltage is below the predetermined threshold, input power is supplied to the primary winding via the other of the end of the primary winding and the tapping of the winding.

Abstract: A device for generation a modulated electrical radio-frequency signal for a magnetic resonance application has a phase modulator that generates a phase-modulated radio-frequency base signal, an amplitude modulator that generates an amplitude-modulated supply voltage, and a non-linear transmission output stage that, to supply the radio-frequency base signal, is connected via a signal input with the phase modulator and, to feed in the supply voltage, is connected via a supply voltage input with the amplitude modulator. The amplitude modulator includes at least two switching power supplies connected in parallel and clocked phase-offset relative to one another.

Abstract: An inherently decoupled MR reception coil arrangement for a magnetic resonance imaging tomography system has a number of selectively pluggable local coils, in which the local coils provided with active detuning also have a passive detuning circuit for the transmission phase, and at least one of the local coils has a passive detuning circuit for the reception phase in the unplugged state.

Abstract: An inherently decoupled MR reception coil arrangement for a magnetic resonance imaging tomography system has a number of selectively pluggable local coils, in which the local coils provided with active detuning also have a passive detuning circuit for the transmission phase, and at least one of the local coils has a passive detuning circuit for the reception phase in the unplugged state.

Abstract: In a radio-frequency receiver unit for a magnetic resonance apparatus, a reception antenna is connected to an input of a noise-matched field-effect transistor preamplifier with a low input impedance. The reception antenna is connected with a detuning stage. The RF receiver unit has a noise suppression stage that can be activated when the reception antenna is detuned.

Abstract: A mammography antenna for magnetic resonance examinations has an examination space with an opening for accepting a female breast, a conductor arrangement for transmitting and/or receiving magnetic high-frequency fields, and a compression arrangement spatially allocated to the conductor arrangement for compressing the breast during the magnetic resonance examination. The compression arrangement includes compression elements movably arranged in a holder part. The conductor arrangement includes first conductor segments that are connected to the compression elements, second conductor segments that are connected to the holder part, and electrical connections that connect the first conductor segments to the second conductor segments and/or connect the first conductor segments to one another.

Abstract: An antenna arrangement for a magnetic resonance apparatus has at least two adjacent individual antennas. Each individual antenna has at least one conductor loop. For mutual decoupling, the conductor loops of the adjacent individual antennas each have an interruption. The interruptions are electrically connected in parallel and are jumpered with at least one capacitive element, the capacitive element having a capacitance value at which the individual antennas are decoupled from one another.