53 results about "Diamagnetism" patented technology

The invention discloses a method for enhancing coalbed methane recovery efficiency by an external magnetic field, which comprises the following steps of: arranging a plurality of electrified coils or magnetic field generators connected with a power supply in a coalbed to generate an alternating magnetic field in the coalbed; cH4 molecules show diamagnetism under the action of a magnetic field, a repulsive effect is generated in a coal seam, and the adsorption effect of CH4 and a coal body is weakened; and on the other hand, as the coal body contains ferromagnetic or paramagnetic minerals, the alternating magnetic field excites the annular eddy current in the coal body through electromagnetic induction so as to generate Joule heat. Therefore, coal matrix expansion and microfracture expansion can be induced by temperature rise of the coal body, the permeability of the coal body is further improved, and more channels are provided for CH4 desorption and flowing; the clean, efficient and environment-friendly coal bed gas exploitation method is provided on the basis of superposition of multiple production increasing mechanisms, and a new technical approach is provided for exploration and development of unconventional oil and gas resources.

The invention discloses a method capable of reducing the refrigeration interval of rare earth fluoride, and belongs to the field of magnetic functional materials. According to the method, diamagnetic ions K < + > are added into rare earth fluoride to reduce magnetic interaction among rare earth ions, so that a magnetic phase transformation point moves to a lower-temperature region, and a lower magnetic ordered temperature and a lower refrigeration interval are obtained while large magnetic entropy change is ensured. The series of materials are LnF3 (Ln = Tb, Dy, Ho, Er, Tm) powder samples and KLn1. 4F5.2 powder samples obtained after K < + > ions are introduced. In order to explore the influence of the addition of K < + > on the magnetic ordered temperature, a 100Oe variable magnetic field is respectively applied to the series of materials. The introduction of K < + > enables the Curivus temperature of the material to be obviously reduced to 3K or below. By comparing the effects of K < + > with different contents on the overall performance of the material, the optimal ratio of K / Gd is found, and under the optimal ratio of LnF3 series samples, before and after the K < + > is introduced, the changes of theta CW values are 4.34 to 2.04 K, 5.31 to 1.76 K, 8.31 to 2.54 K, 14.74 to 1.73 K and 3.59 to 1.75 K in sequence.

The invention discloses an anti-electromagnetic interference full-view liquid crystal display screen module, which relates to the field of liquid crystal display modules, and comprises a display screen assembly, which comprises a display screen body, a frame part arranged in the display screen body, and a main structure shielding bag arranged in the frame part; the shielding assembly comprises an electromagnetic shielding part arranged in the frame part, a special-shaped diamagnetic part arranged in the electromagnetic shielding part and a diamagnetic film part arranged on the outer side of the frame part; the opening and closing assembly is used for adjusting the position between the electromagnetic shielding component and the frame component, the structure enables the ends of the multiple special-shaped anti-magnetic strips to be folded towards the main structure shielding bag, so that the anti-magnetic performance is enhanced, when electromagnetic interference is light, the special-shaped anti-magnetic strips achieve anti-magnetism through the structures of the special-shaped anti-magnetic strips, and according to the difference of the electromagnetic interference, the anti-magnetic performance is improved. When the sliding plate slides, different sliding depths of the sliding plate can be affected, so that the sliding length of the movable strip is controlled, the rotating angle of the special-shaped anti-magnetic strip is affected, and different anti-magnetic effects are achieved.

The present application relates to a kind of for the radiation protection detection in nuclear magnetic machine room, including: shielding sleeve box, by diamagnetic material is made, for shielding external static magnetic field, its internal cavity shape is adapted according to the shape of the used patrol instrument;Ray detection mesh, set up on shielding sleeve box corresponding to the position of patrol instrument probe, by diamagnetic material is made, allow X or gamma ray to penetrate;Instrument data reading mesh, set up on shielding sleeve box corresponding to the position of patrol instrument display screen, by diamagnetic material is made, allow detection personnel to read data directly visually;The import and export of instrument that can be closed, be set on shielding sleeve box, and be equipped with the sealing cover made of diamagnetic material, for the input and output of patrol instrument, the sealing cover is in closed state when detecting.The present application solves the phenomenon that the radiation diagnosis and treatment machine room adjacent place is the radiation protection detection difficult to implement for nuclear magnetic resonance machine room.

Systems and methods are provided for separating or filtering magnetic nano scale particles (e.g., such as dysprosium (Dy), iron (Fe), yttrium (Y), cobalt (Co), nickel (Ni), and others) at the industrial scale with minimum energy consumption. A continuous, scalable flow system can be applied equally to the separation of paramagnetic particles and diamagnetic particles. The system can be continuous in the sense that the fluid can be continuously circulated through the separation chamber and, depending on the operating conditions, may not require multiple separation steps. At the same time, the system can be scaled up to industrial applications to separate magnetic particles from a large volume of fluids, for example at a rate of a few cubic meters per hour (m3 / hr).

Provided herein are compositions comprising substrates that contain polymeric materials or non-magnetic, paramagnetic, or diamagnetic metal objects, and films or inks that contain ferromagnetic materials in which the films or the ferromagnetic materials are transparent. Also provided herein are methods of fabricating the substrates. Further provided herein are ferromagnetic material films containing transparent or translucent films that comprises ferromagnetic materials. The coating imparts functionality to the film such that the film is capable of being mechanically separated from the polymeric materials or non-magnetic, paramagnetic, or diamagnetic metal objects using a commercial magnetic separator. The transparent, food-safe ink composition, which can be printed using high-speed flexographic, gravure, intaglio, offset printing or pad printing consists of an ingestible magnetically susceptible pigment capable of rendering the printed template with magnetically active properties.

Disclosed herein is an apparatus for separation of diamagnetic particles of sub-micron diameter from a fluid. The disclosed apparatus includes a first magnetic coil including a hollow center and a separation unit including an outer enclosure and a second magnetic coil. The second magnetic coil includes a single-layer of windings of a magnetic wire and at least one nonmagnetic wire on a nonmagnetic core where the first magnetic coil houses the separation unit in the hollow inner center. Also disclosed herein is a method of using the apparatus.

This invention belongs to the field of passive drive technology and relates to a three-dimensional passive drive system based on magnetic climbing effect and magnetic synchronous belt, including a working unit, a magnetic attraction unit, a load-moving unit, and a control unit. This invention achieves periodic magnetic coupling between the alternating first ferromagnetic strip and the first non-magnetic strip or the first diamagnetic strip on the drive rod and the permanent magnet synchronous belt on the outside of the cylinder. Only a single drive component is needed to efficiently convert rotational motion into step-like rotation of the magnetic synchronous belt, thereby driving the ferromagnetic rod adsorbed on its surface to move the load stage precisely and controllably horizontally and vertically within the sealed enclosure. Simultaneously, the adsorption switching direction of the ferromagnetic rod is controlled by top electromagnetic assistance, achieving three-dimensional passive precision drive without contact or through holes. This not only significantly simplifies structural complexity, reduces manufacturing costs and space occupation, but also greatly reduces energy consumption and enables the system to maintain positional stability through magnetic adsorption when static.

A kind of abrasive particle multi-parameter on-line monitoring device and method, belong to mechanical equipment wear monitoring technical field, including inductance monitoring module, imaging monitoring module, paramagnetic magnetophoresis separation device, collection cleaning device, system processor.Inductance monitoring module detects the magnetic field disturbance generated when abrasive particle passes, obtains the size, number and ferromagnetic property of abrasive particle, is transmitted to system processor;Imaging monitoring module is triggered according to the inductance pulse signal of inductance monitoring module by system processor, and the shape and size information of abrasive particle are obtained by imaging abrasive particle;Paramagnetic magnetophoresis separation device is used to separate paramagnetic and diamagnetic abrasive particle, and is connected with collection cleaning device.The present application can obtain the information of multiple abrasive particles simultaneously, has the advantages of anti-bubble interference, high response sensitivity, can distinguish paramagnetic and diamagnetic, can multiple information authentication, etc.;The specific occurrence site of mechanical fault and its severity, wear mechanism can be analyzed and confirmed, to ensure that equipment is safe and efficient operation.

The present invention relates to the field of stainless steel and discloses a high-diamagnetic stainless steel and a preparation method thereof. The high-diamagnetic stainless steel comprises the following raw materials in percentage: 0.01%-0.03% carbon, 0.2%-0.3% silicon, 11.5%-12.3% manganese, ≤0.04% phosphorus, ≤0.03% sulfur, 10%-14% nickel, 18.0%-20% chromium, 0.1%-1% copper, 0.15%-0.2% nitrogen, 1%-2% titanium, 1%-3% niobium, and 2%-3% molybdenum, with the remainder being iron. Nickel is a key element for the formation and stabilization of austenite. The presence of a large amount of nickel promotes the formation of a stable austenite structure. The good diamagnetic properties of the austenite phase are the basic guarantee, thereby solving the problem that conventional stainless steel generates significant magnetism after deep drawing, causing such materials to fail magnetic inspections in various transportation vehicles and supermarkets.

The invention relates to a method and a sensor assembly for non-destructively measuring the thickness of a coating formed on a substrate of a workpiece, in which a first coating made of an electrically conductive and diamagnetic or paramagnetic material is optionally disposed over a second coating made of a ferromagnetic material, the method comprises the steps of: (a) placing an inductive sensor head in proximity to a workpiece; (b) measuring an inductance at a plurality of frequencies within a frequency range to obtain an inductance spectrum, and measuring an inductance at a predetermined frequency at a lower third of the frequency range or below a lower limit of the frequency range; (c) determining a characteristic frequency according to the inductance spectrum, wherein the characteristic frequency is the frequency when the phase angle of the inductor is-90 degrees; (d) calculating the thickness of the first coating according to the characteristic frequency; and (e) calculating the thickness of the second coating according to the inductance at the predetermined frequency and the calculated thickness of the first coating.

Systems and methods are provided for separating or filtering magnetic nanoscale particles (e.g., such as dysprosium (Dy), iron (Fe), yttrium (Y), cobalt (Co), nickel (Ni), and others) at the industrial scale with minimum energy consumption. A continuous, scalable flow system can be applied equally to the separation of paramagnetic particles and diamagnetic particles. The system can be continuous in the sense that the fluid can be continuously circulated through the separation chamber and, depending on the operating conditions, may not require multiple separation steps. At the same time, the system can be scaled up to industrial applications to separate magnetic particles from a large volume of fluids, for example at a rate of a few cubic meters per hour (m3 / hr).

The invention discloses a rotor suspension driving structure and method and a motor, and belongs to the technical field of magnetic suspension drive.The rotor suspension driving structure comprises a rotor suspension assembly and a rotor rotation driving assembly which are arranged on the two radial sides of a rotor, and working air gaps are formed between the rotor suspension assembly and the rotor rotation driving assembly and the rotor; the rotor is made of diamagnetic materials, the rotor suspension assembly below the rotor adopts a permanent magnet array and can be arranged in an Opposite or Halbach mode, passive and stable suspension support is provided for the rotor through magnetic repulsive force, the ratio of the suspension force to the gravity of the rotor is increased along with reduction of the scale, the miniature design of the bearing can be achieved, meanwhile, extra space is not occupied, and the bearing is more compact in structure and more compact in structure. And the size requirement of the motor can be further reduced.

The invention discloses an abrasive particle multi-parameter online monitoring device and method, and belongs to the technical field of mechanical equipment wear monitoring, and the abrasive particle multi-parameter online monitoring device comprises an inductance monitoring module, an imaging monitoring module, a parametric diamagnetic magnetophoresis separation device, a collecting and cleaning device and a system processor. The inductance monitoring module detects magnetic field disturbance generated when the abrasive particles pass through, obtains the sizes, the number and the ferromagnetic properties of the abrasive particles and transmits the sizes, the number and the ferromagnetic properties to the system processor; the imaging monitoring module is triggered by the system processor according to the inductance pulse signal of the inductance monitoring module to image the abrasive particles and obtain the shape and size information of the abrasive particles; and the paramagnetic and diamagnetic magnetophoresis separation device is used for separating paramagnetic and diamagnetic abrasive particles and is connected with the collecting and cleaning device. According to the invention, information of a plurality of abrasive particles can be obtained at the same time, and the method has the advantages of bubble interference resistance, high response sensitivity, capability of distinguishing paramagnetism, capability of multi-information verification and the like; the method can analyze and confirm the specific occurrence part, the severity and the abrasion mechanism of the mechanical fault, and guarantees the safe and efficient operation of the equipment.

A transmission line structure and a fabricating method of the same are provided. The transmission line structure includes a dielectric layer, a magnet member and a diamagnetism transmission line. The dielectric layer has a transmission cavity. The transmission cavity has an inner wall. The magnet member is disposed in the transmission cavity and is fixed to the inner wall. The magnet member generates a magnetic field. The diamagnetism transmission line can repel the magnetic field to be levitated in the transmission cavity.

Embodiments provided herein include rotatable magnets (e.g., spherical dipole magnets) disposed within sets of coils that can be used to operate the magnets as reaction / momentum “spheres” and / or as control moment gyroscopes. The coils are able to exert three-dimensional torques onto the magnet in order to effect attitude control of a satellite or other system. The coils can also optionally exert translational forces onto the magnet in order to maintain the magnet in position and avoid contact with static components. Diamagnetic materials can also be included to provide stabilizing repulsive magnetic forces to maintain the magnet in position and / or to reduce the necessary performance of the coils with respect to applying stabilizing translational forces.

The invention relates to an electric sensor (10) for a coherent longitudinal electromagnetic wave emitted by a biological object (1), the sensor comprising a tubular casing (11) comprising a barrel (12) having a front end (13) that is open and a rear end (14) that is closed on the upstream pole of a bipolar switch (15), wherein the downstream pole of the bipolar switch (13) is connected to a potential charge collector (16) made of diamagnetic material, preferably copper. The invention also relates to a system comprising an electrometer designed to co-operate with this sensor (10), and to a measurement method implementing the sensor and the electrometer.

The demonstration device for the magnetic susceptibility difference of different fluid substances in the magnetic field comprises a support, a container supporting disc, a magnet disc, a powerful magnet, a supporting rod, an equipment support, a glass container and video recording equipment, the container supporting disc is installed on the upper portion of the support, and the glass container is arranged on the container supporting disc. Multiple layers of magnet disc height adjusting supporting blocks are symmetrically arranged on the two sides of the lower portion of the support respectively, the magnet disc is erected on the two magnet disc height adjusting supporting blocks of any layer height, the powerful magnet is located below the glass container and installed on the magnet disc, and the bottom of the supporting rod is installed on one side of the support. One end of the device support is in threaded connection with the top of the supporting rod through a bolt and nut assembly I. The video recording device is installed at the other end of the device support. According to the utility model, the paramagnetism and diamagnetism phenomena of different fluid substances can be effectively detected and analyzed, and a simple, visual and accurate means is provided for the research of the magnetic characteristics of the fluid substances.

The invention relates to a time-domain electromagnetic magnetization effect three-dimensional numerical simulation method for diamagnetic metal ores, which comprises the following steps: introducing a Cole-Cole fractional order magnetic susceptibility model into a Maxwell equation set, adopting a time-domain approximation algorithm and a finite difference algorithm to realize discrete calculation of time-domain magnetic induction intensity, and approximating each partial derivative term of a control equation to obtain a time-domain electromagnetic magnetization effect model; and deriving an iterative equation of each component of the electric field and the magnetic field. An electric and magnetic field iteration process with a Maxwell equation set as a control equation is optimized, and finally three-dimensional numerical simulation of the induced magnetization effect of the diamagnetic metal ore is achieved. The invention aims to provide a time-domain electromagnetic induction magnetization effect three-dimensional numerical simulation technology based on diamagnetic metal ores in order to solve the problem that time-domain response characteristics of diamagnetic ore bodies are not clear in existing electromagnetic method detection, and discloses an induction magnetization multi-effect field coupling mechanism generated by underground complex diamagnetic ore bodies. And the diamagnetic metal mine detection precision is improved.

The present invention provides an electrolytic cell suitable for electrolysing certain inorganic compounds of alkali and alkaline earth (Group 1 and Group 2) metals in their molten state. The cell (100) comprises a vessel (102) for containing a molten electrolyte, an anode (10) and a cathode (70) both inside the vessel (102), and a source (20) of a magnetic field having a gradient with a positive component in a direction (– x) from the anode (10) to the cathode (70), such that the strength of the magnetic field increases from the anode (10) to the cathode (70). The rest of the electrolytic cell (100), apart from the source of the magnetic field, including at least both the vessel (102) and the anode (10), consists of material having a magnetic susceptibility with an absolute value of less than 10-2. Thus the rest of the electrolytic cell, which is made of diamagnetic and / or paramagnetic material(s), does not affect the magnetic field between the anode (10) and the cathode (70) to any appreciable extent in comparison to the same magnetic field in free space. The source of the magnetic field between the anode (10) and the cathode (70) may either be a permanent magnet (20) located outside the vessel (102) adjacent to the cathode (70), or it may be provided by permanently magnetizing the cathode (70) itself. In the latter case, the cathode comprises an electrically conducting "hard" ferromagnetic material with a high Curie temperature. In the former case, the cathode instead consists of an electrically conducting material also having a magnetic susceptibility with an absolute value of less than 10-2, so as not to affect the magnetic field from the permanent magnet (20) located outside the vessel (102). In either case, if such a cell (100) is used to electrolyse a halide of an alkali metal, a halide of an alkaline earth metal except beryllium or a hydroxide of an alkali metal in their molten state, the magnetic field between the anode (10) and the cathode (70) inhibits a back-reaction between the electrolysis products formed at the anode (10) and cathode (70), thereby improving the energy efficiency of the cell. A plurality of such cells (100) may also be arranged with just one permanent magnet (20) as the source of the magnetic field between the anode (10) and cathode (70) inside the respective vessels (102) of two adjacent electrolytic cells (100), thereby halving the total number of magnetized components which are used. [Fig. 4A]

To provide a method that enables simpler and more efficient separation of transition metals that frequently exhibit chemical or physical similarity.SOLUTION: This invention provides a method in which, from a solution containing at least two transition metals (one being selected from the group consisting of cobalt, nickel, and iron), each transition metal is precipitated respectively as a ferromagnetic metal and as a paramagnetic or diamagnetic material, and is then separated by utilizing their magnetic differences.SELECTED DRAWING: Figure 9

Disclosed herein is an apparatus for separation of diamagnetic particles of sub-micron diameter from a fluid. The disclosed apparatus includes a first magnetic coil including a hollow center and a separation unit including an outer enclosure and a second magnetic coil. The second magnetic coil includes a single-layer of windings of a magnetic wire and at least one nonmagnetic wire on a nonmagnetic core where the first magnetic coil houses the separation unit in the hollow inner center. Also disclosed herein is a method of using the apparatus.

To provide a composition for a bonded magnet capable of obtaining a bonded magnet having a good appearance even when molded at a relatively low temperature, and to provide a bonded magnet having a sufficient residual magnetic flux density (Br) and a good appearance.SOLUTION: The present invention relates to a composition for a bonded magnet containing rare earth magnetic powder, a polyarylene sulfide resin, and paramagnetic or diamagnetic inorganic particles containing at least one metal element selected from the group consisting of zinc, copper, and manganese, and a bonded magnet obtained from the composition for a bonded magnet.SELECTED DRAWING: Figure 1

The invention provides a transmission line structure and a manufacturing method thereof. The transmission line structure includes a dielectric layer, a magnetic member, and a diamagnetic transmission line. The dielectric layer has a transmission cavity. The transmission cavity has an inner wall surface. The magnetic part is arranged in the transmission cavity and fixed to the inner wall face. The magnetic member generates a magnetic field. The diamagnetic transmission line is configured to repel the magnetic field and suspend within the transmission cavity. When the diamagnetic transmission line is suspended in the transmission cavity, the diamagnetic transmission line is equivalently wrapped by air, so that the dielectric loss and dielectric constant of the transmission line structure are quite low, and the transmission line structure is suitable for transmitting high-speed and high-frequency signals.

The present invention discloses a magnetic membrane separation device, an oxygen-enriched gas supply system and an oxygen-enriched combustion method. The magnetic membrane separation device of the present invention increases a magnetic field outside the membrane separation device, and cooperates with the poly-magnetic medium filled in the membrane material. By utilizing the different paramagnetism and diamagnetism of oxygen molecules and nitrogen molecules, and with the mutual cooperation of the magnetic field and the poly-magnetic medium, the oxygen-enriched effect of simple membrane separation is greatly improved. For the membrane separation module in the oxygen-enriched combustion gas supply system of the present invention, flue gas rich in CO2 is selected as the purge gas for the membrane separation module, directly realizing the mixed combustion of CO2-rich flue gas and O2-rich gas, solving the problems of low oxygen-enriched efficiency of the existing magnetic method and difficulty in detaching oxygen from the enrichment magnetic field, and the entire oxygen-enriched gas supply process is continuous and stable.

To provide a linear electrical machine comprising a frame with a level reference plane and an array of electromagnets, connected to the frame to form a drive plane at a predetermined height relative to the reference plane.SOLUTION: In a transport apparatus 1599, an array of electromagnets (actuators 1700) is arranged so that a series of electromagnets of the array of electromagnets defines at least one drive line within a drive plane, where each of the electromagnets is coupled to an alternating current power source 1585 energizing each electromagnet. At least one reaction platen 1510 is made of paramagnetic, diamagnetic, or non-magnetic conductive material and disposed to cooperate with the electromagnets of the array of electromagnets so that excitation of the electromagnets with alternating current generates levitation and propulsion forces against the reaction platen that controllably levitate and propel the reaction platen along at least one drive line, in a controlled attitude relative to the drive plane.SELECTED DRAWING: Figure 16C

The present invention provides an electrolytic cell suitable for electrolysing certain inorganic compounds of alkali and alkaline earth (Group 1 and Group 2) metals in their molten state. The cell (100) comprises a vessel (102) for containing a molten electrolyte, an anode (10) and a cathode (70) both inside the vessel (102), and a source (20) of a magnetic field having a gradient with a positive component in a direction (– x) from the anode (10) to the cathode (70), such that the strength of the magnetic field increases from the anode (10) to the cathode (70). The rest of the electrolytic cell (100), apart from the source of the magnetic field, including at least both the vessel (102) and the anode (10), consists of material having a magnetic susceptibility with an absolute value of less than 10-2. Thus the rest of the electrolytic cell, which is made of diamagnetic and / or paramagnetic material(s), does not affect the magnetic field between the anode (10) and the cathode (70) to any appreciable extent in comparison to the same magnetic field in free space. The source of the magnetic field between the anode (10) and the cathode (70) may either be a permanent magnet (20) located outside the vessel (102) adjacent to the cathode (70), or it may be provided by permanently magnetizing the cathode (70) itself. In the latter case, the cathode comprises an electrically conducting "hard" ferromagnetic material with a high Curie temperature. In the former case, the cathode instead consists of an electrically conducting material also having a magnetic susceptibility with an absolute value of less than 10-2, so as not to affect the magnetic field from the permanent magnet (20) located outside the vessel (102). In either case, if such a cell (100) is used to electrolyse a halide of an alkali metal, a halide of an alkaline earth metal except beryllium or a hydroxide of an alkali metal in their molten state, the magnetic field between the anode (10) and the cathode (70) inhibits a back-reaction between the electrolysis products formed at the anode (10) and cathode (70), thereby improving the energy efficiency of the cell. A plurality of such cells (100) may also be arranged with just one permanent magnet (20) as the source of the magnetic field between the anode (10) and cathode (70) inside the respective vessels (102) of two adjacent electrolytic cells (100), thereby halving the total number of magnetized components which are used.

A stopper mechanism for a drain includes one of a magnetic stopper and a diamagnetic and a magnetic field generator with a fixed position in relation to the drain which produces a magnetic field having a precise combination of position, geometry, and strength to support the stopper in a stable, levitated, distal position with relation to a drain to permit fluid and waste to pass by the stopper and which does not provide any contact points for collection of debris thereon, and wherein the magnetic field can be changed to cause the magnetic stopper to engage the drain to restrict flow through the drain. The application of the electromagnetic levitation principles creates a truly “clogless” drain mechanism.

Magnetic systems and methods for oxygen separation and purification from fluids utilizing the paramagnetic properties of oxygen. A magnetic field gradient is established in a tube having a first end in flow communication with a source of a fluid containing oxygen. The fluid is flowed through the tube. The magnetic field gradient causes oxygen to be enriched in the fluid on a first interior side of the tube as compared to a second interior side of the tube. For a fluid like air having oxygen, a paramagnetic substance, and other, e.g., diamagnetic, components like nitrogen, argon, carbon dioxide and water vapor, the technology of the disclosure effectively separates oxygen molecules from the other components in magnetic field gradients of sufficient magnitude.

In various embodiments of the invention, a cooled-NMR probe can utilize a non-tapered sliding band capacitor which can be moved relative to the inner conducting skirt of a parent coil to adjust the inductance of the parent coil and thereby the frequency of the parent coil to allow the parent coil to detect the resonance of at a nucleus without requiring leads between the parent coil and a lock coil. The cooled-NMR probe can be provided without the disadvantages of prior art cooled-NMR probes. In an embodiment of the invention, the sliding band capacitor comprises a diamagnetic insulator with a first volume magnetic susceptibility, at least one paramagnetic metal with a second volume magnetic susceptibility and at least one diamagnetic metal with a third volume magnetic susceptibility, where the sum of the first volume magnetic susceptibility, the second volume magnetic susceptibility and the third volume magnetic susceptibility is approximately zero.