44 results about "Resonance" patented technology

The invention belongs to numerical simulation of discharge of a Tokamak device in the field of magnetic confinement controlled nuclear fusion, and relates to a simulation method for controlling a newclassic tearing mode through resonance magnetic disturbance in Tokamak. According to the current data in the Tokamak upper coil assembly, the Biot-Savart law is used for solving an induced magnetic field; integrating is performed to obtain an expression of a polar magnetic flux corresponding to the induced magnetic field according to approximation of a large ring diameter ratio; a Fourier transform pseudo-spectrum method is utilized to transform magnetic flux into components of different moduli to obtain three-dimensional distribution of the components in a tokamak median form, the three-dimensional distribution is coupled into a magnetofluid equation, and the Crank-Nicosolson method is utilized to solve the evolution of the magnetic field with the resonance magnetic disturbance along with time, so that the influence of the magnetic field on the new classical tearing mode is studied. The method can simulate the physical processes of new classic mode locking, inhibition, field penetration and the like of the tearing mode, is high in calculation efficiency and relatively good in numerical stability, and is an efficient numerical method capable of accurately simulating an experiment.

A method for removing truncation artifacts in magnetic resonance images based on missing data reconstruction belongs to the technical field of image processing and comprises the following steps: detecting the magnetic resonance images with the truncation artifacts to obtain low frequency K data; carrying out Fourier inversion on the low frequency K data in the frequency encoding direction to obtain a truncated spectrum G (kx, y) of one-dimensional Fourier transform in the phase encoding direction; extracting singularities and singular value in the images of each row of data of G (kx, y) and reconstructing each row of data to obtain the high frequency partial K data; and carrying out Fourier inversion on the high frequency partial K data Fy(k) to obtain the row information fy(x) of the magnetic resonance images with the artifacts removed and storing and combining fy(x) based on rows to form the magnetic resonance images g(x, y) with the artifacts removed. The method overcomes the artifact problem existing during imaging by zero padding, ensures high signal to noise ratio of the images, effectively reduces the image errors, precisely displays the original magnetic resonance images, provides high quality reliable image information for medical nuclear magnetic resonance detection and is conductive to development and popularization of medical imaging detection technology.

The invention relates to a periodic structure which is based on the local resonance band gap characteristic and has the low-frequency vibration suppression performance, and belongs to the technical field of aviation, aerospace and ship vibration noise control. The periodic structure comprises mass components, elastic components and a base body, and the mass components and the elastic components are periodically distributed. A periodic unit comprises metal structures, namely, the mass components. The side surface of each mass component is surrounded by a circle of rubber or silicone annular structure, namely, the corresponding elastic component. The side surface of the circumference of each mass component is a curved surface with a certain shape. Each elastic component is attached to the corresponding mass component and then surrounds the mass component to serve as a whole period to be arranged in the elastic structure base body. The elastic components are also attached to the base body. The periodic structure has the obvious band gap characteristic. The periodic structure based on the local resonance band gap characteristic has the good low-frequency vibration suppression performance.

Complex magnetic resonance (MR) image data, acquired from an examination subject that has at least two different spin species, are processed in a method and a device. At least one MR parameter that influences data acquired in an MR data acquisition is determined with spatial resolution. Complex image data are respectively acquired with each of multiple acquisition units in an MR data acquisition at multiple echo times, such that a phase difference between the first spin species and the second spin species is different at least two of the echo times. For multiple image points, a value of the at least one MR parameter is determined so that a function that depends on the at least one MR parameter and the corresponding image point in the complex image data satisfies an extreme condition.

The invention discloses a building method of a molecularly imprinted fluorescent probe, wherein the material is Mn:ZnS quantum dot-molecularly imprinted polymer composite microsphere, which is formed by Mn:ZnS quantum dot, a styrene-polyacrylic acid copolymer and template molecule thiabendazole in a copolymerization manner under the ultrasonic action, so as to form a sensing probe with specific recognition after the template molecule thiabendazole is removed. The building method has the advantages that the molecularly imprinted fluorescent probe is designed and built by the Mn:ZnS quantum dot as a fluorescent sensor unit by using a molecular imprinting technique on the basis of the fluorescence resonance energy transfer mechanism; the Mn:ZnS quantum dot and the benzimidazole are subjected to fluorescence resonance energy transfer when the template molecule thiabendazole enters a hole of the Mn:ZnS quantum dot-molecularly imprinted polymer composite microsphere, thus resulting in quenching of emitted orange fluorescent light. Therefore, benzimidazole in the water can be specifically identified by an output change of a fluorescent signal.

A driving apparatus for a plasma display panel with a pulse generator to supply an alternating pulse to an electrode, and an energy recovering unit to store charges from a discharge cell when the pulse voltage decreases or to output the stored charges to the discharge cell when the pulse voltage increases. The energy recovering unit has a magnetic switch, coupled with the discharge cell and an energy storage capacitor, with variable inductance to control transient time when the pulse transitions from a first voltage to a second voltage. The transient time is based on LC resonance of the magnetic switch inductance and panel capacitance, and can be reduced to improve resolution of the panel. Insulated gate bipolar transistors can be used with the magnetic switches to reduce power loss during switching and in the on-state, and can sustain high voltages necessary for high concentration Xe discharge gas.

A band pass filter includes a longitudinally coupled resonator elastic wave filter on a piezoelectric substrate and parallel arm resonators at parallel arms, each connected between a series arm connecting an antenna terminal and a receiving terminal and one of ground terminals. The parallel arm resonators include a first parallel arm resonator having the highest resonance frequency among the parallel arm resonators and a second parallel arm resonator. A second ground terminal that is one of the ground terminals connected to the second parallel arm resonator and a third ground terminal that is one of the ground terminals connected to the longitudinally coupled resonator elastic wave filter are connected to each other. A first ground terminal that is one of the ground terminals connected to the first parallel arm resonator is not connected to the second or third ground terminals.

A magnetic field generator includes a power source and a segmented or un-segmented coil connected to the power source to generate a time-varying magnetic field. Energy is applied to the coil so that the coil generates a time-varying magnetic field gradient with a magnitude of at least 1 milliTesla per meter and a rise-time of less than 10 microseconds. The coil may be comprised of overlapping, non-overlapping or partially overlapping coil segments that may individually energized to further improve the operating characteristics of the coil to further decrease bio-effects in magnetic resonance imaging through the use of reduced pulse lengths and multi-phasic magnetic gradient pulses.

The invention discloses a magnetothermal effect-based magnetic field measurement method. The method is mainly characterized in that magnetic energy is absorbed in an alternating magnetic field to generate heat by using ferroferric oxide nanoparticles, and the total effective refractive index of a waveguide is changed, so that an output resonance peak of a magnetothermal effect-based silicon micro-ring magnetic field sensor shifts to achieve magnetic field measurement. The method has the advantage that the magnetic field measurement range is improved. Meanwhile, the invention provides a magnetic field sensor based on the method; the size of a traditional magnetic field sensor is reduced by using the advantages of a high quality factor of the magnetic field sensor and the magnetothermal effect of the magnetic nanoparticles; a solid foundation is laid for integration, intelligentization and miniaturization of the magnetic field sensor; meanwhile, the structure is simple; the sensitivity of the sensor can be changed through optimizing the size design of the sensor and the properties of the magnetic nanoparticles; and the magnetic field sensor is flexibly applicable to various scenarios. Meanwhile, the invention provides a magnetic field sensor-based preparation method, and the preparation method has the advantage that the manufacturing efficiency is improved.

A frequency tunable filter and an associated apparatus are provided, wherein the frequency tunable filter may include a plurality of ports including an input port and an output port, and may further include an inductor-capacitor (LC) resonator, a switching unit that is coupled between the LC resonator and a ground terminal of the frequency tunable filter, and a resonance adjustment unit that is coupled between the LC resonator and the ground terminal. For example, the LC resonator may include a first terminal coupled to each of the input port and the output port, and may further include a second terminal, the switching unit may selectively provide a conduction path between the second terminal of the LC resonator and the ground terminal, and the resonance adjustment unit may selectively change a resonance characteristic of the LC resonator. According to the present invention, the overall performance of an electronic device is guaranteed.

A first oscillation circuit in which a helical antenna is used as a part of an element for a resonance circuit and a second oscillation circuit in which a loop antenna is used as a part of an element for a resonance circuit are caused to oscillate at substantially the same frequency. When a human body approaches the helical antenna and the loop antenna, the frequency difference increases between the first oscillation circuit and the second oscillation circuit. This frequency difference is extracted using a BPF.

The invention discloses an intelligent warehouse for a container for dangerous chemicals. The intelligent warehouse comprises the container; transparent glass is embedded in the side surface of the container; a resonance trough is formed in the lower end in the container; grooves are communicated with the two ends of the inner part of the resonance trough; the inner sides of the grooves are fixedly connected with resonance springs; resonance blocks are fixedly connected with the other ends of the resonance springs; a resonance plate is fixedly connected with the other sides of the resonance blocks; the surface of the resonance plate is connected with the inner side of the resonance trough in a sliding manner; a transition plate is fixedly connected with the upper end of the resonance trough. The intelligent warehouse has the advantages that when the container is assembled and moved, the dangerous chemicals in the container are subjected to anti-vibration protection, unloading is relatively convenient, the working efficiency of workers is greatly improved when the storage safety is ensured, and the intelligent warehouse is fixed placed and used, and the using range is relatively large.

The invention discloses a method for segmenting a blood pool in a diastasis image in a heart cardiac function magnetic resonance image. The method comprises obtaining heart magnetic resonance images I<NP> including several lamellas of the left ventricular myocardium and in different cardiac cycle phases; in the magnetic resonance image I<MP> corresponding to each cardiac cycle phase of the intermediate lamella, calculating the maximum-strength projection image of an initial region-of-interest in all cardiac cycle phases, carrying out cluster segmentation on the maximum-strength projection image, and selecting a region A with the biggest circular degree; calculating the image average gray value of the magnetic resonance image I<MP> corresponding to each cardiac cycle phase of the intermediate lamella in the region A, and making the magnetic resonance image I<MP> having the maximum average gray value be the magnetic resonance image I<MP(ED)> corresponding to the diastasis of the intermediate lamella; segmenting the magnetic resonance images of the lamellas from the intermediate lamella to the cardiac apex lamella and the cardiac base lamella, and completing segmentation of the blood pool in the magnetic resonance image I<NP(ED)> in the diastasis.

The invention relates to a method for establishing an animal model for senile dementia, a special liquid medicine and a dosing device, and belongs to the technical field of neurosciences. The method comprises the following steps: obtaining positioning coordinates of paraceles according to brain atlases or/and magnetic resonance image data of an experimental animal; respectively burying a conduit of the dosing device in left and right paraceles of the animal, and injecting the special liquid medicine to the paraceles at a constant speed in 14-16 minutes under a sterile environment within 2-3 weeks, wherein the liquid medicine amount is 100-250 ml methanol per day; alternately dosing the left and right paraceles, wherein the dosing frequency is 18-30 hours at an interval; and continuously dosing for 2-10 months to obtain a non-human primate animal model for senile dementia. With the adoption of a novel dosing mode: dosing to the paraceles at the constant speed, medicine can circulate to whole brain through the cerebrospinal fluid to exert the toxic effect, so that peripheral damage by the medicine is avoided. The AD model is established by injecting methanol or formaldehyde to the paraceles, so that behaviors and pathological symptoms are typical, the basic physiological status is good and the individual difference is relatively smaller.

The invention provides a resistance-double resonance composite sound absorbing profile. The resistance-double resonance composite sound absorbing profile comprises a resistance sound absorbing material, an aluminum fiberboard, a micro-perforated panel and a plate surface support frame which are independent from one another. According to the technical scheme provided by the invention, different noise frequency bands are inhibited for different noise source frequency spectrum features by adjusting material parameters and the process parameters of a cavity structure; and a low-frequency sound absorbing coefficient to 125 Hz can reach 0.54. An average sound absorption coefficient to a frequency band of 125 Hz-500 Hz can reach 0.77, and the minimum sound absorption coefficient to a frequency band of 250 Hz and 1,600 Hz can reach 0.36.

The invention relates to a polypeptide sequence specifically bonded with poultry bursal virus VP2 protein, and an application of the polypeptide sequence, and belongs to the field of molecular biology. Through computer-aided design, based on the crystal structure of the poultry bursal virus VP2 protein, through a molecular docking virtual screening technique, polypeptide ligands which are optimalin target protein binding mode and affinity are searched in a virtual polypeptide database, and the polypeptide sequence is SERWDN namely IBDVL9-15. Expressed and purified IBDV VP2 protein is subjected to ELISA and localized surface plasmon resonance experiment, the result indicates that IBDVL9-15 polypeptide can have favorable binding capacity with IBDV VP2 protein, and the designed polypeptide can be used for performing fast detection as well as separation and purification on IBDV VP2 antigens.

The invention discloses a compressor. The compressor comprises a shell, a motor and at least one muffler, wherein the motor is arranged in the shell, each muffler is connected to the inner wall of the shell, a muffling chamber is defined between each muffler and the shell, and a plurality of through holes are formed in each muffler. According to the compressor disclosed by the invention, the muffling chamber is defined by each muffler and the shell, so that sound waves can enter each muffling chamber for resonance muffling, and the noise problem of the compressor is obviously solved.

In a method and apparatus for determining measurement protocol parameters of a magnetic resonance (MR) image, a first MR image exhibiting first contrast properties, is read into a computer and at least one first contrast ratio is determined in the computer from the first contrast properties. The computer then determines the measurement protocol parameters dependent on the at least one first contrast ratio, in order to generate a second MR image exhibiting second contrast properties such that the second contrast properties approximate, as closely as possible, to the first contrast properties. The measurement protocol parameters are presented as an output from the computer.

The invention discloses a cross-correlation detection system based on up-conversion and fluorescence resonance energy transfer nanoparticles. The system comprises a fluorescence cross-correlation spectroscopy detection module, an aptamer, up-conversion particles and fluorescence resonance energy transfer nanoparticles. The two ends of the aptamer are modified with the up-conversion particles and fluorescence resonance energy transfer nanoparticles. The fluorescence cross-correlation spectroscopy detection module excites the up-conversion particles and fluorescence resonance energy transfer nanoparticles to emit radiation spectrum separation light and detects fluorescence signals of the two kinds of light respectively. A computer carries out processing to obtain autocorrelation and cross-correlation spectra of the two kinds of light; and the autocorrelation and cross-correlation spectra are analyzed precisely to obtain parameters like the aptamer concentration. According to the invention, the selected up-conversion particles and fluorescence resonance energy transfer nanoparticles have the large anti-Stokes shift, so that the signal light, excited light, and environment noises are separated conveniently and the interference of background noises is reduced. Meanwhile, because of the up-conversion particles and fluorescence resonance energy transfer nanoparticles with large spectrum intervals, the interference between channels is reduced and the detection accuracy and result accuracy are improved.

The invention relates to a magnetic resonance system, a superconducting magnet system and a low-temperature maintaining device thereof. The low-temperature maintaining device comprises an inner barrel, an outer barrel, a superconducting coil and a deformation part, the outer barrel sleeves outside the inner barrel, a cavity for containing cooling liquid is limited between the inner barrel and theouter barrel, the superconducting coil is arranged in the cavity, and at least part of the superconducting coil is soaked by the cooling liquid; the deformation part is arranged in the cavity, and volume of the deformation part can be changed by adjusting quantity of a medium filled inside to enable the deformation part to be used for changing liquid level of the cooling liquid in the cavity. By the superconducting magnet system and the low-temperature maintaining device, liquid level of the cooling liquid in the cavity can be elevated, and the problem of lowering of the liquid level of the cooling liquid due to consumption during transportation can be avoided.

The present invention relates to the portable terminal giving the connecting means (13) to the other side of the slit (S) with giving the resonance circuit part (30) consisting of the resonating capacitor (Cr) working in the ultra-high frequency to the short circuit and it passes the high frequency signal power through works in the low frequency to the opening and cuts off the low-frequency signal electricity and the resonance inductor (L2) working in the low frequency to the short circuit and it passes the low-frequency signal electricity through works in the ultra-high frequency to the opening and cuts off the high frequency signal power to one side of the slit (S) and does to the upper plate (10a) and under plate (10b) to the radiator and in addition, guarantees the local area wireless communication of the low-frequency antenna (RX) including the code division multiple access of the high frequency antenna (A).

The invention discloses a single-direction non-periodic vibration device which comprises two motor supports fixed to a base in a symmetrical mode. A left motor and a right motor are fixed to the two motor supports respectively. A motor shaft of the left motor is connected with a left weld block shaft through a flat key. A motor shaft of the right motor is connected with a right weld block shaft in a transmission mode through another flat key. A left weld part is fixed to one end of the left weld block shaft, a left eccentric block is welded to the outer surface of the left weld part, a right weld part is fixed to one end of the right weld block shaft in an inward mode, and a right eccentric block is installed on the outer surface of the right weld part in a sleeved mode. The invention further discloses a control method using the single-direction non-periodic vibration device for achieving synchronization of the two motors. The device and the method can guarantee robustness of single-direction vibration and generate better material resonance and are higher in compaction efficiency.