摘要:
A nuclear magnetic resonance (NMR) spectrometer for investigating a liquid sample in a sample tube, in particular a glass sample tube (12), has a sample bushing (1) surrounding the sample tube having a bore into which one end of the sample tube is inserted with tight fit. The sample bushing (1) is preferably substantially cylindrical and the bore extends along the cylindrical axis. The NMR spectrometer has a gripping device (13) for handling the sample bushing (1), the gripping device (13) having at least three gripping fingers (14a-14d), and the outer periphery of the sample bushing (1) has at least one groove (2) into which the gripping fingers (14a-14d) can engage to press onto the two outer edges of the groove (2) when the gripping device (13) is closed. The cooperation between the groove and the gripping device permits fully automated, precise handling of the samples.
摘要:
A nuclear magnetic resonance (NMR) spectrometer for investigating a liquid sample in a sample tube, in particular a glass sample tube (12), has a sample bushing (1) surrounding the sample tube having a bore into which one end of the sample tube is inserted with tight fit. The sample bushing (1) is preferably substantially cylindrical and the bore extends along the cylindrical axis. The NMR spectrometer has a gripping device (13) for handling the sample bushing (1), the gripping device (13) having at least three gripping fingers (14a-14d), and the outer periphery of the sample bushing (1) has at least one groove (2) into which the gripping fingers (14a-14d) can engage to press onto the two outer edges of the groove (2) when the gripping device (13) is closed. The cooperation between the groove and the gripping device permits fully automated, precise handling of the samples.
摘要:
A method for setting a temperature of a sensor element, which is heatable with the aid of a heating device, for detecting at least one property of a gas in a measuring gas chamber includes at least one regulation of the heating device, the regulation including: (a) detecting at least one actual value of at least one controlled variable of the sensor element, (b) ascertaining a setpoint value of the at least one controlled variable, (c) generating at least one manipulated variable of the heating device with the aid of a comparison of the setpoint value and the actual value, and (d) in a monitoring step, checking at least one parameter used to set the temperature, and the at least one manipulated variable being influenced as a function of the check.
摘要:
A nuclear magnetic resonance (NMR) probe component, comprising a microfabricated planar gradient chip (1), with a substrate thickness dgc≦3 mm, carrying three micromachined planar partial gradient coils (10a-10f) on each of its two outer surfaces (12a, 13a), wherein the partial gradient coils (10a-10f) of the gradient chip (1) form a three-dimensional gradient system, wherein the gradient chip (1) has a central guiding and positioning slot (15) between the two outer surfaces (12a, 13a). The probe component also has a sample chip (2) for carrying an NMR sample at a sample location, with a microfabricated planar RF coil (21), wherein the sample chip (2) fits exactly in the guiding and positioning slot (15) such that in a measurement position, the sample location coincides with the center of the gradient system. The NMR probe component has improved spatial resolution and allows good alignment of the RF coil and the gradient system.
摘要:
A sample vessel (80) made of material with magnetic susceptibility χ2, for containing a sample substance (87) with magnetic susceptibility χ3≠χ2 to be analyzed in a nuclear magnetic resonance (NMR) spectrometer, has an inner interface G2 toward the sample substance and an outer interface G1 toward the environment (85) that exhibits magnetic susceptibility χ1. The shape of the interface toward the sample substance and the interface toward the environment are coordinated to match the discontinuities in susceptibility at the interfaces in such a way that on introduction of the sample tube filled with sample substance into the previously homogeneous magnetic field of an NMR spectrometer, the magnetic field inside the sample substance remains largely homogeneous.
摘要:
A nuclear magnetic resonance (NMR) probe component, comprising a microfabricated planar gradient chip (1), with a substrate thickness dgc≦3 mm, carrying three micromachined planar partial gradient coils (10a-10f) on each of its two outer surfaces (12a, 13a), wherein the partial gradient coils (10a-10f) of the gradient chip (1) form a three-dimensional gradient system, wherein the gradient chip (1) has a central guiding and positioning slot (15) between the two outer surfaces (12a, 13a). The probe component also has a sample chip (2) for carrying an NMR sample at a sample location, with a microfabricated planar RF coil (21), wherein the sample chip (2) fits exactly in the guiding and positioning slot (15) such that in a measurement position, the sample location coincides with the center of the gradient system. The NMR probe component has improved spatial resolution and allows good alignment of the RF coil and the gradient system.
摘要翻译:一种核磁共振(NMR)探针组分,其包含具有衬底厚度d 3 g 3≤3mm的微制造平面梯度芯片(1),载有三个微加工平面部分梯度线圈(10a--10 f)在其两个外表面(12a,13a)中的每一个上,其中梯度芯片(1)的部分梯度线圈(10a-10f)形成三维梯度系统,其中梯度芯片 )在两个外表面(12a,13a)之间具有中心引导和定位槽(15)。 探针组件还具有用于在样品位置携带NMR样品的样品芯片(2),其具有微制造的平面RF线圈(21),其中样品芯片(2)精确地配合在引导和定位槽(15)中, 在测量位置,样本位置与梯度系统的中心重合。 NMR探针组件具有改进的空间分辨率,并且允许RF线圈和梯度系统的良好对准。
摘要:
A floor outlet for an air conditioner has a grill which is formed by ring elements whose radial connecting ribs are inclined to impart a vortex flow to the emerging air. A central baffle body is constituted by a disc and a multiplicity of angularly equispaced radially extending blades twisted out of the plane of the disc and projecting therefrom.
摘要:
In a method for detecting the operational readiness of a jump lambda sensor associated with an internal combustion engine the internal resistance of the sensor is determined as the criterion for the operational readiness of the sensor. The internal resistance is measured by applying a pulsed current to the sensor, the frequency of the current being selected as a function of the state of the sensor (1, 2, 3, 4).
摘要:
A multiple resonance sample coil for a magic angle spinning nuclear magnetic resonance probe is comprised of a solenoid coil that resonates at low frequencies and a resonator that resonates at high frequencies. The ends of the low frequency solenoid coil are electrically connected to the high frequency resonator to eliminate arcing and allow the solenoid coil to extend the full width of the resonator. In some embodiments, the high frequency resonator is constructed from the outermost turns of the solenoid coil in the form of a birdcage resonator. In another embodiment, the solenoid coil is electrically connected to one turn of the resonator and the other turn is used as part of a trap to shunt the resonator at low frequencies.
摘要:
In a method for detecting the operational readiness of a jump lambda sensor associated with an internal combustion engine the internal resistance of the sensor is determined as the criterion for the operational readiness of the sensor. The internal resistance is measured by applying a pulsed current to the sensor, the frequency of the current being selected as a function of the state of the sensor (1, 2, 3, 4).