341 results about "Field coil" patented technology

The invention belongs to the technical field of electronic parts, and provides a damping-adjustable roller structure and a damping adjusting method. The first annular shaft is fixed to the mounting base, and a plurality of first bosses are evenly arranged on the end face of the first annular shaft; the second annular shaft is rotationally arranged on the mounting base, the second annular shaft and the first annular shaft are coaxially arranged, and second bosses are evenly arranged on the surface of the end, facing the first boss, of the second annular shaft; the first annular shaft is provided with a magnetic field coil, the magnetic field coil is used for adjusting the magnetic intensity of the first annular shaft, gaps are formed between the first bosses and the second bosses, and the first bosses and the second bosses are arranged in a one-to-one correspondence mode. The magnetic field intensity of the first annular shaft is changed by adjusting the current magnitude and direction of the magnetic field coil, so that the magnetic attraction force between the first boss and the second boss is adjusted, and the damping is adjustable when the second annular shaft rotates. Meanwhile, the magnetic field coil can convert kinetic energy of the second annular shaft into electric energy to achieve the technical effect of electric energy collection.

The invention provides a CPT atomic clock magnetic field coil constant calibration system and method.The CPT atomic clock magnetic field coil constant calibration system comprises a CPT atomic clock, a frequency measurement module and an upper computer, the upper computer is used for setting the number of times of measurement, calculating a third analog signal in each time of measurement according to a first digital signal in each time of measurement, and sending the third analog signal to the CPT atomic clock; calculating the actual clock transition frequency during each measurement according to the frequency division number of the phase-locked loop circuit and the frequency of the clock signal during each measurement, calculating the external magnetic field during each measurement according to the actual clock transition frequency during each measurement, and finally performing linear fitting according to the external magnetic field during multiple measurements and the third analog signal to obtain a third analog signal; and obtaining a magnetic field coil constant. The invention provides a CPT atomic clock magnetic field coil constant calibration system and method. The system and method are used for solving the problems that a magnetic field coil in a CPT atomic clock is small and cannot be measured, current distribution calculation is complex due to the fact that magnetic shielding is applied, and the actual winding condition of the coil cannot be accurately simulated during simulation.

The invention discloses a water-cooling pulsed high-intensity magnetic field coil, and belongs to the technical field of pulsed high-intensity magnetic fields. The coil adopts a laminated structure, each laminated sheet is provided with an opening and a boss, and a spiral structure is formed through electrical connection of the bosses. Each lamination is divided into a through-flow part, a water cooling part and a fixed part; the through-flow part is made of red copper, the water cooling part and the fixing part are made of stainless steel, and an integrated copper-steel composite structure is formed through welding. The water-cooling part is provided with water-cooling grooves welded and sealed by a cover plate; and the water-cooling grooves of the laminations are connected in series through water inlet and outlet holes to form a cooling flow channel. The fixing part is provided with a semicircular fixing hole used for limiting and flow guiding. And an insulating sheet is arranged between the adjacent laminations. The coil is pressed tightly through the upper and lower pressing plates and an insulated fixing stud. Through lamination partitioning and copper-steel compounding, the high-strength and efficient water-cooling capacity is achieved, and the problems of insufficient strength and cooling of the pulse high-intensity magnetic field coil under repetition frequency work are effectively solved.

The invention discloses a transfer device and a transfer method for transferring a polar field coil of a nuclear fusion device, and relates to the technical field of transfer of parts of the nuclear fusion device. The transfer device comprises a moving mechanism, a supporting mechanism, a supporting piece and a limiting piece, the supporting mechanism is fixedly arranged on the moving mechanism, and a supporting arm is formed on the supporting mechanism; the supporting pieces are in one-to-one correspondence with the supporting arms, each supporting piece is movably arranged in the extending direction of the corresponding supporting arm, and a clamping cavity used for containing at least part of the polar field coil is defined in each supporting piece; the limiting pieces correspond to the supporting arms one to one, each limiting piece is arranged on the corresponding supporting arm, the limiting pieces and the supporting pieces are connected through adjusting pieces, and the adjusting pieces are used for adjusting the distance between the supporting pieces and the limiting pieces. According to the transfer device, the transfer requirements of the polar field coil with large size, heavy weight and strict requirements can be met, it is guaranteed that the polar field coil is accurate in pose and reasonable in stress in the transfer process, and the requirements of the dynamic load coefficient and the unbalance load coefficient are met.

The invention discloses a quadrupole / octupole composite iron system for beam homogenization. The composite iron system comprises a composite magnet current control device, a composite magnet main power supply and quadrupole / octupole composite iron, the composite magnet current control device is used for controlling a composite magnet main power supply to output quadrupole field coil current and octupole field coil current of quadrupole / octupole composite iron. The quadrupole / octupole composite iron is used for simultaneously generating a dominant quadrupole magnetic field and an octupole magnetic field, so that the effects of quadrupole iron and octupole iron can be simultaneously realized by only installing one transmission element; according to the invention, a quadrupole magnetic field and an octupole magnetic field are generated in the aperture of the composite iron, focusing and homogenization of beam envelope are realized at the same time, the number of transmission elements can be reduced, the length of a transmission line can be shortened, and the construction cost of the beam transport line is reduced. The problem that traditional quadrupole iron and octupole iron cannot be simultaneously installed at the maximum beam envelope position due to the space problem and cannot play a great role of a magnet is solved.

The invention discloses a high-temperature pipeline magnetostrictive guided wave sensor and a monitoring method, and relates to the field of ultrasonic nondestructive testing. According to the sensor, a wrinkled iron-cobalt alloy belt is used as a sensitive element, and the sensor is in dry coupling contact with a to-be-detected pipeline; the high-temperature-resistant static magnetic field coil is wound on the outer side of the aluminum pre-tightening ring in a solenoid mode, and a bias pulse excitation mode is adopted. Alternately winding the bottom end of the wrinkle structure of the wrinkle-type ferrocobalt alloy belt and the back surface of the belt material, controlling the wrinkle-type ferrocobalt alloy belt to excite a guided wave signal in a pulse section, and receiving the guided wave signal in a bias section; the dynamic magnetic field and the static magnetic field generated by the two groups of coils are perpendicular in direction, and torsional mode guided waves are generated in the high-temperature pipeline based on the reverse Weidmann effect. The sensor is easy to install and stable in performance, the whole structure is resistant to high temperature for a long time, and the engineering problem of high-temperature failure is solved. The method provided by the invention comprises the steps of optimizing pre-tightening force, pulse voltage and bias current parameters, so that the transduction efficiency is improved, and the capability of detecting new defects of the pipeline in high-temperature and variable-temperature states is enhanced.

A superconductor magnet system including a superconductor magnet including a plurality of field coils connected in series, each field coil having a plurality of turns including superconductor material. The system also includes a primary electric current source connected across the plurality of the field coils for supplying a DC electric current to the field coils to generate a magnetic field. The system further includes a secondary electric current source connected in parallel with the primary electric current source across a subset of the field coils for supplying an additional DC electric current to the or each field coil in the subset to modify or correct the magnetic field.

The electromagnetic flowmeter comprises a shell and a sphere, connecting pipes are fixedly connected to the two ends of the surface of the shell, first connecting flanges are fixedly connected to the ends, away from each other, of the two connecting pipes, a fixing cylinder is fixedly connected to the center of the top of the shell, and a second connecting flange is fixedly connected to the top end of the fixing cylinder; the sphere is rotationally connected to the center in the shell, a communicating groove is horizontally formed in the shell in a penetrating mode, a rotating mechanism for rotating the sphere is arranged in the shell, and indicating mechanisms are arranged on the two symmetrical sides of the surface of the shell. Through the arrangement of the ball body, the magnetic field coil can be conveniently placed during use, meanwhile, the magnetic field coil can be conveniently protected, and in the use process, the ball body can be rotated to facilitate connection and disconnection of fluid in the shell, so that the use effect of the device is improved, and meanwhile, a rotating disc can be driven to rotate; the flow direction of the fluid of the device can be facilitated through the indicating arrow arranged on the surface of the turntable, and the mounting convenience of the device is improved.

The invention relates to a current control circuit, a focus control circuit and method of an electron beam and a medium. The current control circuit is connected with the magnetic field coil and used for driving the magnetic field coil to generate a target magnetic field; the current control circuit comprises a driving conversion unit and a controller. The driving conversion unit comprises a plurality of cascaded switching tube circuits, and the input end of each switching tube circuit is connected with a corresponding bus voltage source; the output end of the driving conversion unit is connected with the magnetic field coil; and the controller is connected with the driving conversion unit and controls the output of each switching tube circuit in the driving conversion unit so as to control the characteristics of the current output to the magnetic field coil by the driving conversion unit. The current control circuit can meet the requirements of control efficiency and universality at the same time.

The utility model relates to the technical field of electromagnetic vibration tables, in particular to an electromagnetic vibration table convenient for heat dissipation, which comprises a main body mechanism, a functional mechanism, a heat dissipation mechanism and an auxiliary mechanism, the functional mechanism is positioned in the main body mechanism, the heat dissipation mechanism is positioned in the main body mechanism, and the auxiliary mechanism is positioned on one side of the main body mechanism. Excitation signals are sent out through the control panel fixedly installed on one side of the shell of the electromagnetic vibration table, the vibration base connected with the coils is driven through the first magnetic field coil and the second magnetic field coil which are arranged in the magnetic field, and the moving coil upper guiding system and the moving coil lower guiding system are used for stabilizing equipment. A flow guide fan is fixedly installed at the bottom end of the vibration table heat dissipation base, air is sucked in from an equipment air inlet in one side of the electromagnetic vibration table shell and exhausted from an equipment air outlet in one side of the vibration table heat dissipation base, and a fence net is installed between the equipment air inlet and the equipment air outlet, so that foreign matter is prevented from entering and damaging equipment.

A magnetic resonance imaging apparatus according to an exemplary embodiment includes a magnet, a gradient magnetic field coil, a sequence controller, and a plurality of metal shims. The magnet generates a static magnetic field. The gradient magnetic field coil applies a gradient magnetic field to a subject. The sequence controller applies a current to the gradient magnetic field coil by executing a first pulse sequence. The plurality of metal shims is used for passive shimming in which the plurality of metal shims is arranged based on the static magnetic field distribution in a state where a temperature of the gradient magnetic field coil is increased by execution of the first pulse sequence. The sequence controller executes a second pulse sequence for imaging the subject after completion of the passive shimming.

The invention discloses a horizontal two-dimensional orientation steel fiber UHPC wind power tower drum ring piece preparation device and method, and relates to the technical field of wind power tower drum engineering. The device is mainly composed of an annular mold, an annular sliding rail, an electric sliding block, coils and a direct-current power source, the direct-current power source supplies power to the coils on the inner side and the outer side to generate a uniform and controllable magnetic field, the coils are driven by the electric sliding block to achieve synchronous annular rotation, the magnetic field intensity and the action time are adjusted according to different flowing degrees of UHPC mixtures, and therefore the UHPC mixtures can be manufactured. And under the action of a rotating magnetic field, the steel fibers form two-dimensional distribution in a horizontal plane. Compared with a traditional UHPC wind power tower drum, the horizontal two-dimensional directional steel fiber reinforced UHPC wind power tower drum produced by the device has the advantages that the compression bearing capacity is improved by 15%-20%, and the compression fatigue resistance is improved by 40%-50%. According to the tower drum structure, the thickness of the tower drum ring section can be reduced by 10%-20%, the dead weight of the tower drum and the consumption of raw materials are reduced, and the transportation and construction cost is reduced. The device is simple in design and convenient to disassemble and assemble, has efficient and reliable industrial production potential, and can be widely applied to manufacturing and optimization of wind power towers.

The utility model relates to the technical field of magnetic field coil brackets, in particular to an adjustable magnetic field coil bracket, which improves the supporting stability of a magnetic field coil, improves the convenience of rotating and adjusting the magnetic field coil, and improves the convenience of supporting and fixing magnetic field coils with different sizes. Comprising a base and a guide rail, the device comprises a base, a guide rail, a driving device, a power device, a limiting device, a supporting device, two sets of sliding blocks and two sets of supporting shafts, the two sets of sliding blocks are slidably installed on the outer side wall of the guide rail, and the driving device is arranged on the base and used for driving the two sets of sliding blocks to move oppositely. The two ends of the two sets of supporting shafts are rotationally installed on the inner side walls of the two sets of sliding blocks through driving of power devices, limiting devices are arranged on the two sets of sliding blocks and used for limiting the front sides and the rear sides of the supporting shafts, and the supporting devices are arranged on the base and used for supporting and limiting the tops of the magnetic field coils.

The invention discloses a magnetic field intensity adjustable melt stirring system and a control method, and relates to the technical field of metallurgical casting, the magnetic field intensity adjustable melt stirring system comprises a crystallizer having an inner wall and an outer wall, a cooling cavity being formed between the inner wall and the outer wall; the shielding cover is fixedly arranged outside the crystallizer in a sleeving mode, and the magnetic field coil single-layer units are arranged on the inner wall of the shielding cover. The magnetic field intensity adjusting unit is electrically connected with each magnetic field coil single-layer unit and is used for dynamically adjusting the amplitude, the frequency and the waveform of the input current; the solidification interface detection module is arranged on the side wall of the crystallizer and used for detecting the melt solidification interface position in real time; the control module is in signal connection with the solidification interface detection module and the magnetic field intensity adjusting unit. The gradient magnetic field is accurately matched with the melt solidification process, dendritic crystal crushing is accurately strengthened, a traditional rotating assembly is replaced, energy loss generated by bearing friction, mechanical damping, mechanical vibration and the like is eliminated, the mechanical structure is simplified, the electromagnetic efficiency is improved, invalid power supply is avoided, and energy consumption is reduced.

The present invention discloses a DC magnetic field testing device for a magnetic field coil, comprising a device main body, a display component provided on the front end surface of the device main body, a control button provided on the front end surface of the device main body, a charging port provided on the bottom of the device main body, a probe cable fixedly connected to the top of the device main body, a Hall probe fixedly connected to the other end of the probe cable, a rectangular block fixedly connected to the outer surface of the Hall probe, a protective tube fixedly connected to the right side surface of the device main body, a storage component fixedly connected to the back of the device main body, and a charging component provided on the bottom of the device main body; the DC magnetic field testing device for a magnetic field coil can more intuitively display the remaining power of the device by providing the display component, and can issue an alarm when the power is too low to remind the user to charge; the protective component provided can protect the Hall probe after use to prevent damage to the probe.

Provided is an RF shield that achieves a balance between an improved irradiation efficiency and suppression of eddy current-induced heat by a gradient magnetic field coil, while avoiding complexity of conductor pattern design for suppressing an eddy current by the gradient magnetic field coil.A cylindrical RF shield, which is one of elements constituting a high-frequency coil unit, is formed by rolling patterned conductive thin films formed on both front and back surfaces of an insulating sheet, front and back patterns of the patterned conductive thin film are mirror-symmetrical in a central axis direction of a cylinder, the front pattern is divided into two in the central axis direction, one side of two divided patterns is further divided into two in a circumferential direction, each of three independent pattern islands has slits such that strips are formed along to the cylinder axis direction, and each of the strips has a portion connected in an up-down direction at one location.

The invention relates to the technical field of nuclear fusion device installation, and discloses a polar field coil supporting device and a polar field coil jacking method.The polar field coil supporting device comprises a base, a vertical adjusting part and a horizontal adjusting part, and the horizontal adjusting part, the vertical adjusting part and the base are arranged in the vertical direction; the horizontal adjusting part comprises a first base, a horizontal supporting seat, a first adjusting mechanism and a second adjusting mechanism, and the first base is connected with the vertical adjusting part; the horizontal supporting seat is movably arranged on the first base in the first direction and the second direction. The first adjusting mechanism is arranged on the first base and drives the horizontal supporting base to move in the first direction. The second adjusting mechanism is arranged on the first base and drives the horizontal supporting base to move in the second direction. According to the polar field coil supporting device, the positions of the polar field coil in the vertical direction and the circumferential direction can be accurately adjusted, and the installation requirement of the polar field coil at the bottom of a nuclear fusion device is met.

The invention relates to the technical field of lithium battery protection, and discloses a lithium battery thermal runaway detection device which comprises a matched power supply, a high-frequency alternating magnetic field coil, a thickness sensor, a broadband ultrasonic sensor, a high-frequency current transformer and an intelligent processing module. The high-frequency alternating magnetic field coil emits high-frequency electromagnetic waves to enable the lithium battery diaphragm to output test voltage, if the diaphragm has insulation weak points, partial discharge is caused, and liquefied water is formed and gasified due to small-area breakdown. The thickness sensor detects the bulging thickness of the battery caused by gasification of liquefied water, the broadband ultrasonic sensor receives an ultrasonic signal of disruptive discharge, and the high-frequency current transformer collects the high-frequency characteristic quantity of current. And the intelligent processing module receives the data, normalizes the data, calculates a fault value in a weighted manner, and judges that the diaphragm has an early fault point if the fault value exceeds a threshold value. The device performs multi-dimensional detection, accurately calculates a fault value, can timely find an early fault point of the lithium battery diaphragm, effectively prevents thermal runaway, and ensures the use safety of a lithium battery.

Field winding rotary machine, with: a stator (24) having a stator core (32) and a stator coil (34) wound around the stator core; a rotor (26) having a rotor core (42) and a rotor field coil (44) wound around the rotor core; a rectifier element (52) connected between both ends of the rotor field coil; and a capacitor (54, 502) having one end connected to one end of the rectifier element and the other end connected to any point of the rotor field coil, wherein the rotor field coil has a first field coil part (44-1) connected in parallel with the capacitor and a second field coil part (44-2) connected between the other end of the rectifier element and the other end of the capacitor.

A polarization device comprising: a spin exchange optical pump for hyperpolarizing a noble gas, the spin exchange optical pump comprising a magnetic field coil arrangement configured to provide a static uniform magnetic field used by the spin exchange optical pump within a static uniform magnetic field region; and a storage holder for storing the hyperpolarized noble gas output from the spin exchange optical pump in a gas phase, the storage holder being located outside the oven of the spin exchange optical pump and inside the static uniform magnetic field region, and providing a corresponding storage space for storing and holding the hyperpolarized noble gas generated by the spin exchange optical pump.

The invention provides an electromagnetic ultrasonic transducer probe of a HalbacH permanent magnet assembly. The electromagnetic ultrasonic transducer probe comprises a shell, a magnet set, a coil assembly and a driving mechanism. The magnet group is accommodated in the shell, is formed by arranging a plurality of magnets according to preset polarities and is used for providing a bias magnetic field, and the coil assembly is arranged outside the shell, is positioned on one side close to the test piece and is used for exciting ultrasonic waves in the bias magnetic field and receiving ultrasonic signals reflected from the test piece after pulse current is introduced; a fixing frame is arranged on the periphery of the magnet set and used for installing and fixing the magnet set, a movable interval is formed between the fixing frame and the inner wall of the shell and located on the side, away from the test piece, of the magnet set, and the driving mechanism is installed on the shell, connected with the fixing frame and used for driving the magnet set to be away from or close to the coil assembly in the direction perpendicular to the test piece. And the distances between the magnet group and the coil assembly are different. The bias magnetic field intensity acting on the test piece is adjusted by adjusting the position of the magnetic assembly.

This optically pumped magnetic sensor module comprises: a cell in which an alkali metal is sealed; and a coil unit that generates a magnetic field to act on the cell. The coil unit has a support frame body formed in a shape conforming to a rectangular parallelepiped and disposed so as to surround the cell, and a plurality of coils provided on the support frame body. The support frame body includes a pair of first surfaces facing each other in a first direction, and a pair of second surfaces facing each other in a second direction perpendicular to the first direction. The plurality of coils include a pair of first coils. One of the pair of first coils extends from one of the pair of first surfaces over both of the pair of second surfaces. The other of the pair of first coils extends from the other of the pair of first surfaces over both of the pair of second surfaces.

A stellarator comprising a non-planar magnetic field coil with a cable as well as a method for providing a cable for a non-planar magnetic field coil in a stellarator is presented. Additionally, a cable and a method for manufacturing a cable are presented. The cable comprises an inner section (100) comprising multiple layers of superconductor material (200), the multiple layers of superconductor material (200) having a first orientation (210, 210a, 210b, 210c), an outer section (300) surrounding the inner section (100), the outer section (300) having a cross-section (310) with a second orientation (320, 320a, 320b, 320c), wherein the outer section (300) comprises a first conductive material (410) which fixes the first orientation (210, 210a, 210b, 210c), wherein the first orientation (210, 210a, 210b, 210c) changes along a length (50) of the cable (40) with respect to the second orientation (320, 320a, 320b, 320c).

A method for fabricating a high-temperature superconductor HTS field coil using one or more HTS strips. Each HTS strip includes a layer of HTS material. The method includes: winding the one or more HTS strips around an axis to form a field coil comprising a winding of HTS strips; and removing material from at least a portion of the one or more windings from the axial edges of the one or more HTS strips to reduce the extent of the one or more HTS strips along the axis of the field coil.

To provide a technique capable of preventing deformation of a conductive member fixed to a rotor.SOLUTION: A winding field motor includes: a rotor that is fixed to a motor case and includes a stator that generates a magnetic field by energization, a rotor core around which a field coil is wound, and a rotor shaft to which the rotor core is assembled, is disposed on an inner diameter side of the stator and relatively rotatable with respect to the stator; and a power supply device that includes a rotor and a stator that rotate integrally with the rotor shaft, and is electrically connected to the field coil by a conductive member. The winding field motor is configured so that the conductive member extends toward an outer diameter side of the rotor, and the rotor includes: a fixing part that fixes the conductive member to the rotor; and a restricting part that restricts the movement of the conductive member in a direction away from the rotor on an inner diameter side of the fixing part.SELECTED DRAWING: Figure 1

The invention belongs to the technical field of magnetic measurement testing, and particularly relates to a magnetic moment coil calibration device and method, which can realize that a magnetic moment coil keeps still in the calibration process, realizes the change of magnetic flux through the change of current, and then calculates the magnetic moment through the variable quantity of the magnetic flux. In the invention, the relative position between the calibrated magnetic moment coil and the standard constant magnetic field coil as the magnetic flux induction coil is always kept fixed in the calibration process, so that the problem that the magnetic axis is difficult to align accurately due to physical movement in the traditional drawing method or overturning method is thoroughly avoided; therefore, the reference alignment precision and reliability of calibration are improved. Magnetic moment coils with different sizes can be matched through the magnetic flux induction coils with different uniform area sizes, and the problem that the pulling or overturning operability of large magnetic moment coils is poor can be avoided.

A rotor (60), which is applicable to a wound-field rotating electric machine (40), includes: a rotor core (61) having main pole portions (62) provided respectively for magnetic poles aligned in a circumferential direction, each of the main pole portions protruding in a radial direction; and a field coil (70) wound on the main pole portions of the rotor core. Moreover, the field coil has a coil end part (CE) located axially outside the rotor core. An annular member (103, 104, 182) is provided, on a radially outer side of the coil end part, in such a manner as to surround the coil end part.

A motor that is a wound field synchronous motor and includes a rotor and a stator. The rotor includes a plurality of winding portions configured to have a preset cross-section for generating a uniform effective air gap. The winding portions are spaced from each other a predetermined distance apart along a circumferential direction of the rotor. A field coil is wound around the plurality of winding portions.

An electromagnetic forming method and device based on a three-coil dual-power supply board. The method includes the following steps: S1. Clamp the edge of the metal board to fix the metal board, place a background magnetic field coil and an eddy current coil above the metal board, and place an improvement coil below the metal board; S2. Connect the background magnetic field coil to a long-pulse-width power supply system to generate a background magnetic field; S3. When the long-pulse-width pulse current reaches the peak value, connect the eddy current coil and the improvement coil in series and then connect them to a short-pulse-width power supply system, so that the board in the magnetic field is subjected to an upward Lorentz force and deforms upward. The present invention realizes a new scheme for forming a board by the cooperation of three groups of coils under the action of attractive electromagnetic force. By controlling the discharge voltage and the capacitor capacitance value in the three groups of power supply devices, the eddy current and the magnetic field can be flexibly regulated, and the diversified loading of the Lorentz force can be realized.

The invention discloses a hydrogen atomic clock, a power supply circuit of a coil and a power supply adjusting circuit. The power supply adjusting circuit comprises a magnetic sensor and a supplementary power supply circuit. And the magnetic sensor is arranged at the quantization axis magnetic field coil and is used for sampling a magnetic field generated by the quantization axis magnetic field coil. The supplementary power supply circuit is connected with the two ends of the magnetic sensor and the two ends of the quantization axis magnetic field coil and used for providing corresponding compensation current for the quantization axis magnetic field coil according to the magnetic field sampling result of the magnetic sensor, power supply adjustment of the quantization axis magnetic field coil is achieved, and the power supply adjustment introduces a sampling signal of the magnetic sensor as feedback. Power supply compensation can be more accurate, and the long-term accuracy of the hydrogen atomic clock is improved.