18 results about "Multiple resonance" patented technology

The present disclosure relates to a kind of direct current transformer, direct current transformer includes: transformer circuit, inverter circuit, rectifier circuit and resonance circuit;The direct current side of inverter circuit is connected with direct current input port, the alternating current side of inverter circuit is connected with the primary side of transformer circuit;The alternating current side of rectifier circuit is connected with the secondary side of transformer circuit, the direct current side of rectifier circuit is connected with direct current output port;Resonance circuit includes multiple resonance modules, the alternating current side of inverter circuit is connected with the alternating current side of rectifier circuit through multiple resonance modules and transformer circuit;Resonance module includes first capacitor, resonance module is used to control the input or cut-out of first capacitor.The present disclosure can simulate the voltage outputted when direct current transformer adopts different capacitance resonant capacitor, so as to ensure that direct current transformer does not need to set resonant capacitor, can satisfy the realization condition of resonant soft switching in different working condition scene, and then make the switching device in inverter circuit and rectifier circuit can realize soft switching.

The application belongs to the technical field of organic electroluminescent materials, and particularly relates to a multiple resonance thermally activated delayed fluorescence compound, and simultaneously relates to a thermally activated delayed fluorescence material containing the compound, an organic electroluminescent device, and application of the compound, the material and the device in the field of display and illumination. The multiple resonance thermally activated delayed fluorescence compound provided by the application takes a naphthoindolocarbazole fused ring unit as a strong donor, takes a B atom as a core electron-withdrawing unit, constructs a rigid MR conjugated skeleton with N-B alternately arranged, effectively reduces the optical band gap of the material through the strong electron-donating ability of the fused ring donor, and realizes red light band emission. Meanwhile, based on the multiple resonance effect, narrow-band red light emission is realized, and the color purity is excellent, which can fully meet the stringent requirements of the red light color gamut of the ultra-high-definition display BT.2020 standard.

The present application relates to a kind of compound and its application, and organic electroluminescent device comprising the compound, the compound has the following structure, wherein, Z1 and Z2 are not connected, connected by single bond or connected by chemical bond to form ring A, Z3 and Z4 are not connected, connected by single bond or connected by chemical bond to form ring B, the ring A, ring B each independently selected from one of unsubstituted or R' substituted C6-C60 aryl, unsubstituted or R' substituted C3-C60 heteroaryl, R 11 Single substituent represents the maximum allowable number of substituent groups. The device prepared by using the compound of the present application can achieve higher external quantum efficiency, lower turn-on voltage, narrower half-peak width of red light emission and stable device performance. The present application will continue to promote the development of future high light efficiency, high stability, full light color multiple resonance materials and devices.

The present application relates to the technical field of fan bearing fault diagnosis, in particular to a fan bearing fault online detection method and system, adopting a weighted combination envelope spectrum technology, quantifying the correlation of fault characteristics and resonance frequency bands through two-dimensional spectrum coherence, combining the frequency domain signal-to-noise ratio to adaptively assign weights, aggregating and enhancing the fault information of multiple resonance frequency bands, effectively offsetting the attenuation effect in the signal transmission process, solving the problem of signal attenuation distortion caused by magnetic attraction installation through the machine shell under the limitation of fan structure size. The order tracking and constant angle increment sampling technology is introduced, the corresponding relationship between the vibration signal and the bearing rotation angle is established, the time domain signal is converted into the angle domain signal, the fault characteristic frequency and the rotating speed are decoupled, the theoretical fault frequency of the inner ring, the outer ring, the roller and other components is accurately matched with the detection result, the detection adaptability under variable working conditions is greatly improved, compared with the fixed frequency domain analysis of the traditional acceleration envelope method, the misjudgment caused by frequency offset is effectively avoided.

The application discloses a narrow-band blue light molecule and a preparation method and application thereof. The application introduces two donor units into a fluorene skeleton, forms a dislocation structure with a multiple resonance unit in space, and regulates the strength of the space charge transfer. On one hand, the reverse intersystem crossing rate can be improved to improve the performance and efficiency of a device. On the other hand, the high-efficiency light emission of the narrow-band is maintained. The application further discloses a preparation method and application of the material. The narrow-band blue light molecule can be used as a novel light-emitting molecule with high performance, high color purity and high quantum efficiency. The narrow-band blue light molecule has great application potential in the preparation of light-emitting materials, light-emitting devices and electronic technology, and has a bright prospect in the field of display technology and solid-state lighting.

The utility model relates to an exhaust silencer, belong to automobile exhaust system technical field, exhaust silencer includes: shell pipe, inner core pipe and axial baffle. Wherein, set up resonance cavity between shell pipe and inner core pipe, multiple axial baffles divide resonance cavity into multiple resonance subchamber, one of resonance subchamber is as starting subchamber, multiple resonance subchamber is started along the circumferential direction in order and is connected in series from starting subchamber, and is connected in series into the resonance passage of one end closed, the other end opening. Still relate to a kind of vehicle, including vehicle body and exhaust silencer, and exhaust silencer is installed on vehicle body. The exhaust silencer and vehicle of the utility model form equivalent 1 / 4 wavelength pipe structure in the space of cylindrical shape between shell pipe and inner core pipe under the premise of not increasing Y direction cross-sectional area, realize the resonance frequency in 1 / 4 wavelength pipe structure and the standing wave frequency in front muffler main exhaust passage offset, to solve long pipe standing wave problem, improve the noise elimination performance.

The application provides a boron-nitrogen organic compound and application and an organic electroluminescent device, the boron-nitrogen organic compound has a structure as shown in formula I, through the design and cooperation of a boron-nitrogen multiple resonance structure and specific groups connected thereto, the boron-nitrogen organic compound has a narrow spectrum and high luminous efficiency, meanwhile, the triplet energy level is reduced, the efficiency roll-off and life decay caused by the slow reverse intersystem crossing of the boron-nitrogen multiple resonance material are eliminated, and excellent photoelectric performance is achieved. The boron-nitrogen organic compound is used in the organic electroluminescent device, and is especially suitable for being used as a doping material to provide excellent light emitting effect, improve the light emitting efficiency of the device, prolong the service life of the device, and comprehensively improve the performance of the device.

The application belongs to the field of organic photovoltaic materials, and relates to a multiple resonance type non-fullerene acceptor material, a preparation method and application, the multiple resonance type non-fullerene acceptor material has the structures shown in general formula I and general formula II. The multiple resonance type non-fullerene acceptor material provided by the application has a maximum absorption edge of 812 nm, and a molar absorption coefficient as high as 6.01*10 4 M ‑ 1 cm ‑1 , and simultaneously has a deep LUMO energy level, the lowest being -3.62 eV.

The application relates to a nanofiber acoustoelectric device with a flat frequency response and a preparation method thereof. The nanofiber acoustoelectric device comprises a nanofiber membrane, an upper electrode and a lower electrode, the nanofiber membrane is located between the upper electrode and the lower electrode to form a sandwich structure, and the nanofiber acoustoelectric device is formed. The elliptical through-hole structure utilizes the flexibility of the long axis direction to induce the nanofiber membrane to excite multiple high-order vibration modes under the excitation of sound waves, multiple resonance peaks are superimposed in the frequency domain, the response trough of a traditional device is filled, and thus the intrinsic flat frequency response in the target frequency band is realized. The single elliptical through-hole is expanded into a multi-hole array structure, the effective vibration area can be further expanded and the internal stress of the membrane can be improved through hole coupling, the flat bandwidth is widened, the output voltage is improved, high-fidelity and low-distortion acoustoelectric signal conversion can be realized without a complex external equalization circuit, and the application has important application value in the field of flexible wearable acoustics sensing.

This utility model relates to a special sound field structure inside a speaker enclosure, including a speaker housing and a base snapped into the inside of the speaker housing. Several support legs are installed below the base for mounting and support. At least four resonant blocks are arranged on the inner wall of the speaker housing, and a positioning post is provided between two adjacent resonant blocks. The positioning post is fixedly installed on the top and side of the inner wall of the speaker housing. Several positioning posts are installed on the upper surface inside the base, the number of which is the same as the number of positioning posts. This special sound field structure utilizes the sound wave reflection and diffusion characteristics of a circular or conical shape inside the speaker enclosure. A raised semi-circular fan-shaped microcavity resonant structure design is added inside the circular or conical speaker enclosure, so that the same sound waves inside the speaker enclosure do not form a booster field requiring attenuation, but instead increase the effect of multiple resonance diffusion reverberation caused by reflection in different directions.

This invention provides a boron-nitrogen organic compound and its applications. The boron-nitrogen organic compound has the structure shown in Formula I. Through molecular structure design and inter-structural interactions, it possesses properties of both multiple resonance molecules and conjugated molecules, exhibiting a narrow fluorescence emission spectrum and high quantum efficiency. Furthermore, the specific Ar group... D The boron-nitrogen organic compound forms weak intramolecular interactions with B atoms, restricting molecular rotation and enhancing structural stability. When applied to organic electroluminescent devices, this compound can serve as a fluorescent dopant in the luminescent layer, effectively improving the luminous efficiency and lifespan of organic electroluminescent devices, giving them higher color purity, reducing voltage and energy consumption, and comprehensively enhancing device performance.

The application discloses an antenna and a car, comprising an antenna main body. The antenna main body comprises a first branch, a second branch, a third branch, a seventh branch, an eighth branch, a tenth branch and an eleventh branch located in a first plane, and a connecting part, a fourth branch, a fifth branch, a sixth branch, a ninth branch and a twelfth branch located in a second plane, wherein the first plane is perpendicular to the second plane. Through the layout of each branch of the antenna, the antenna has good working performance in a limited space. The antenna can excite multiple resonance frequency points, and the compact layout can meet the performance requirements of the antenna in the limited space.

The application discloses a hidden target geometric parameter acquisition method based on ground penetrating radar echo multiple resonance information and belongs to the field of radar signal processing. At present, commonly used ground penetrating radar hidden target parameter acquisition methods are mostly based on imaging algorithms or three-dimensional reconstruction methods of first scattering of ground penetrating radar echo targets, and the algorithm complexity is high. The application fully excavates the multiple resonance echo mechanism generated in the process of detecting targets by the ground penetrating radar, establishes a target geometric parameter acquisition model based on internal harmonics and external harmonics, directly obtains the geometric parameter information of the hidden target from the time domain diagram of the multiple resonance echo, provides a new method for target detection and estimation of the ground penetrating radar, and effectively solves the technical problems of great difficulty in target analysis and geometric parameter estimation in the existing ground penetrating radar echo.

The present application relates to a kind of based on clustering analysis aerosol optical tweezers resonance peak track identification method and system, belong to spectral resonance peak identification technical field, solve the problem that in prior art, when aerosol optical tweezers spectral data is analyzed, it is difficult to accurately, completely, automatically identify multiple resonance peak tracks, and then influence subsequent physical parameter inversion precision.The method comprises: obtaining multiple frames of aerosol spectral data, extracting candidate resonance peak, constructs time-peak position data set;According to time-peak position data set, determine anchor track using dynamic track tracking algorithm;Based on anchor track, calculate the relative wavelength difference value corresponding to each candidate resonance peak;All relative wavelength difference values are carried out clustering analysis, and the candidate resonance peak track is determined;Based on anchor track and candidate resonance peak track, determine resonance peak track.Accomplish the physical constraint based on the relative distance stability between resonance peak, the automation, high-precision identification and reconstruction of multiple resonance peak tracks from complex noisy spectral data.

This invention provides an organic compound and its application. The organic compound has the structure shown in formula (1). Through the design of the molecular structure and the mutual complexation between groups, it achieves the purpose of adjusting the light color while possessing the narrow emission spectrum characteristics and high luminous efficiency of a multiple resonance material. The organic compound has excellent electroluminescence performance and narrow spectrum characteristics. When used in organic electroluminescent devices, it can serve as a fluorescent dopant material for the luminescent layer, effectively improving the luminous efficiency of the device, extending the device lifetime, and giving the device higher color purity, thus endowing the device with a superior overall luminous effect.

The present application relates to a kind of multiple resonance structure modified cyclophthalic light-emitting material and synthesis method and application, multiple resonance structure is introduced into cyclophthalic molecule, the light-emitting material obtained can emit light of different colors under different temperature or fumigation processing etc., with tunable luminescence characteristics;It can also be applied to organic optoelectronic devices, and show certain application potential;The synthesis route of material of the present application is simple.The multiple resonance structure modified cyclophthalic light-emitting material synthesized in the present application has the structural formula as shown below:

The application provides a waveguide device, a microwave outdoor unit and a microwave distance transmission device, and relates to the technical field of communication. The waveguide device comprises a cavity, a cover plate, a ridge structure, a ferrite, a permanent magnet and a tuning piece. The cavity comprises opposite first and second surfaces, and the first surface is provided with a chamber. The cover plate is arranged on the first surface of the cavity and covers the chamber. The ridge structure is arranged in the chamber, the ferrite is arranged on the ridge structure, and the permanent magnet is arranged on the second surface of the cavity. The tuning piece is arranged on the ridge structure, the tuning piece is spaced apart from the ferrite, the top surface of the tuning piece away from the second surface is higher than the top surface of the ridge structure away from the second surface, the tuning piece is coupled with the ridge structure, the tuning piece can introduce an in-band resonance point, the effect of multiple resonances is achieved, the working frequency of the device can be adjusted, and the bandwidth of the working frequency can be widened. The waveguide device can be applied to the microwave outdoor unit or the microwave distance transmission device to realize one-way transmission of radio frequency signals.