90 results about "High frequency" patented technology

In an antenna apparatus, two pattern antennas are arranged side by side in an area close to a ground conductor layer on a surface of a dielectric substrate, in such a manner as to be formed substantially line-symmetrical with each other. Each of the pattern antennas includes a radiation element having a feed coupler, a mutual coupler, and a feed element fed by a high frequency circuit unit. An open end of the radiation element is located near the ground conductor layer. The feed element and the feed coupler are capacitively coupled with each other, whereby the radiation element is excited. At the excitation, the mutual couplers that extend substantially in parallel with and close to each other are capacitively coupled with each other, and hence, polarization planes of the electric fields radiated from the radiation elements can be made orthogonal to each other.

The invention belongs to the field of medical signal processing, particularly provides an eeg high-frequency oscillation signal detecting system based on a convolution neural network, and aims to solve the problem that in a conventional eeg high-frequency oscillation signal detection technique, the false drop rate is high caused by high-frequency noise and peaked wave shape. The eeg high-frequency oscillation signal detecting system comprises a user terminal, a data preprocessing module, a high-frequency oscillation signal predetecting module, the convolution neural network module and a static module, wherein the user terminal is used for acquiring an eeg signal; the data preprocessing module is used for performing data preprocessing; the high-frequency oscillation signal predetecting module is used for performing detection on the eeg signal to obtain suspected high-frequency oscillation fragments; and the convolution neural network module is used for classifying all the suspected high-frequency oscillation fragments. According to the eeg high-frequency oscillation signal detecting system disclosed by the invention, when HFOs are detected, the sensitivity can be effectively improved, the false drop rate is reduced, and the precision rate of epileptogenic focus positioning is increased; and besides, the eeg high-frequency oscillation signal detecting system can use scalp eeg and can also use cortex eeg, so that the egg high-frequency oscillation signal detecting system can enable a doctor to achieve more flexibility.

A water boiling device includes a heat tank unit received in a machine body, a high frequency induction heater, and a heat pipe unit. Heat tank unit includes first and second heating tanks in communication with each other. Outside water can flow into first and second heating tanks. The high frequency induction heater includes a heat pipe induction coil and first and second induction coils. The heat pipe unit includes first and second heating pipes. An upper section of each heating pipe is received in one of heating tanks, and a lower section of each heating pipe extends out of heating tanks and is inserted into heat pipe induction coil. The first and second heating tanks will heat up to heat the water in first and second heating tanks when a high frequency current is passed through the heat pipe induction coil and first and second induction coils.

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.

A resonant gate drive circuit provides efficient switching of, for example, MOSFETs. However, the operation of resonant gate drive circuits often does not allow applications where high switching frequencies are required. According to the invention, a precharging of the inductance of the resonant gate drive circuit is performed. This allows highly efficient and fast MOSFET operation.

The invention discloses a concrete permeability resistance measuring system based on high-frequency alternating current, belonging to the field of concrete performance testing. The concrete permeability resistance measuring system is characterized in that an 89C52 type microprocessor, a TLC5615 type amplitude adjustment adjusting D/A module, an AD9832 type direct digital frequency synthesizer, an AD534 type multiplier and a CVA-1000 type power amplification module in a program-control high-frequency alternating current power supply are adopted, user expected frequency and current value input by a computer are modulated into required high-frequency alternating current, and then the high-frequency alternating current is output; then, current in a measuring loop is collected by a DAM-3502 type isolation sampling module; closed loop control is carried out after the current is judged by software containing a PID (Proportion Integration Differentiation) control module via the computer; and measurement on the concrete permeability resistance of the high-frequency alternating current expected by the user is formed. The concrete permeability resistance measuring system has the advantages of high measuring precision, large loading capability and good stability and convenience for function expansion.

A triple-band antenna for an electronic device with a communication capability comprises a first radiating body, a second radiating body, a metal base and a signal feed source. A dual-band antenna for low frequency and high frequency bands may be formed by the first radiating body. A middle-frequency band antenna and a balun may be formed by the combination of the first radiating body and the second radiating body, and the balun may be used to increase the bandwidth of operating frequencies of the intermediate frequency band antenna.

An orientation-insensitive ultra-wideband coupling capacitor. The orientation-insensitive ultra-wideband coupling capacitor includes a plurality of external surfaces, a low frequency portion, and a high frequency portion. The high frequency portion is so disposed on, and electrically connected to, the low frequency portion so as to allow the orientation-insensitive ultra-wideband coupling capacitor to work identically when mounted on any external longitudinal surface of the plurality of external surfaces thereof and thereby be readily SMT compatible without regard to special orienting procedures.

Said system includes a reader and at least a responder. It is characterized by that a wireless signal with specific form is used to create wireless communication between the reader and responder, said wireless signal is formed from logic signal portion and time slot portion, the logic signal portion is used for transferring various commands or informations of reader to responder, and time slot portion is used for responder to make back scattering modulation and transfer one-column binary bit response signal to reader; it uses the wireless communication as basis, the reader can transfer correspondent command and/or information to responder, and can make the responder implement correspondent conversion between initial state, general inquiry state, general search state, waiting state and confirmation state and execute search and or inquiry action of reader to responder so as to implement identification of reader to responder.

The invention discloses a heating circuit of a battery. The heating circuit comprises a temperature sensor, a battery management device and a charging circuit. The temperature sensor is mounted in a battery pack; the temperature sensor detects the real-time temperature of the battery pack and sends a temperature signal. The battery management device is connected with the temperature sensor; the battery management device receives the temperature signal sent by the temperature sensor. The charging circuit is connected with the battery management device, wherein the battery management device compares the temperature signal with a critical temperature; when the temperature signal is lower than or equal to the critical temperature, the battery management device controls the charging circuit towork in a high-frequency heating mode and the charging circuit heats the battery pack; when the temperature signal is higher than the critical temperature, the battery management device controls the charging circuit to work in a charging mode and the charging circuit charges the battery pack. The heating circuit of the battery is used for realizing heating the battery through the high-frequency charging and discharging to the battery by utilizing the properties that the battery is high in internal resistance at a low temperature and generates much heat, and the influence cannot be generated tothe safety of the battery by high-frequency alternating-current charging and heating.

The invention relates to a method and a device for generating a true random number. The device comprises a high frequency oscillator, an initial seed number generation unit, an error diffusion calculation unit, a linear feedback unit, a control unit and a random number output unit, wherein the output end of the high frequency oscillator is connected with the input end of the initial seed number generation unit; the output end of the initial seed number generation unit is connected with the input end of the error diffusion calculation unit; the output end of the error diffusion calculation unit is connected with the linear feedback unit; the output end of the linear feedback unit is connected with the control unit; and the control unit is connected with the random number output unit. The device achieves a metastable state circuit only by using general logic hardware, so the hardware structure is simplified; one-time-pad is realized by storing an initial seed number in a cache reset at each time; judgment and feedback control are realized by using a generator polynomial; and a secure hash algorithm is realized by using an error diffusion process, therefore, an effect that the random number is difficult to copy or forecast is achieved.

The invention discloses a device and a method of detecting turn-to-turn short circuit of an electromagnetic voltage transformer. The detection device comprises a high-frequency low-voltage steep pulse generation module, a high-speed acquisition module and an upper computer with built-in analysis software, wherein the high-frequency low-voltage steep pulse generation module is used for generating nanosecond steep pulses and injecting the steep pulse signals to a detected electromagnetic voltage transformer winding; the high-speed acquisition module is used for acquiring characteristic waveforms after passing through the detected electromagnetic voltage transformer winding and containing winding short circuit fault, and after pre-processing and storage are carried out, the characteristic waveforms are transmitted to the upper computer; and the upper computer adopts a repetitive pulse method to analyze and process the received characteristic waveforms, and thus, the short circuit fault characteristics of the detected electromagnetic voltage transformer winding can be obtained. Thus, the early turn-to-turn fault of the voltage transformer winding can be detected, turn-to-turn insulation conditions can be positioned and compared quantitatively, further expansion of the fault can be avoided, and reliable guarantee is provided for safe and stable operation of a power system.

The invention provides an embedded smart card. The embedded smart card comprises a card substrate of any shape and an antenna circuit module, wherein the antenna circuit module is arranged on the card substrate; an embedding hole used for arranging the antenna circuit module is reserved on the card substrate; and the shape of the embedding hole is matched with the outer contour of the antenna circuit module. The antenna circuit module is an insulator, is fixedly arranged in the embedding hole and is detachably connected with the card substrate. The invention also provides a manufacturing method for the embedded smart card, which comprises the following steps of: selecting the ordinary card-shaped card substrate made of a special material according to the occasion at which the card is used and the application of the card; correspondingly reserving a circular embedding hole matched with the card substrate on the card substrate according to the size and the shape of the antenna circuit module; aligning and positioning the antenna circuit module and the embedding hole on the card substrate; curing the antenna circuit module in the embedding hole reserved on the card substrate by a method of high-frequency welding or hot stamping; and performing function expansion and beautification on the card substrate and the antenna circuit module.

The invention provides a hybrid energy supply system for a high-voltage direct current breaker. The energy supply system comprises a high-frequency isolating transformer energy supply portion and a laser energy supply portion, which are arranged in parallel to realize redundant energy supply of the high-voltage direct current breaker. The technical solution provided by the invention can satisfy the electrical isolating condition at different levels on high levels, is comprehensive in function, improves the power supply reliability of the high-voltage direct current breaker, and ensures stable, reliable and uninterrupted operation of the high-voltage direct current breaker.

A contrast calculating unit calculates a contrast of a high frequency component and a contrast of a low frequency component of a transformed radiographic image at an analysis point set by an analysis point setting unit. A ratio calculating unit calculates a ratio of the contrast of the high frequency component to the contrast of the low frequency component. A determining unit determines whether or not there is a body motion during an imaging operation to take the radiographic image based on the ratio. A display control unit displays a result of the determination on a display unit.

A power transfer system includes a power transmission device and a power reception device which are capacitively coupled to allow electrical conduction therethrough in the manner of alternating current. The power transmission device includes an active electrode, a passive electrode, a step-up transformer, and a high-frequency voltage generating circuit. The power reception device includes an active electrode, a passive electrode, and a load circuit. A divider for voltage division based on load capacitances (C1 and C2) is provided between the active electrode and the passive electrode. The active electrode and the passive electrode have respective equivalent capacitances to ground (Ca and Cp) relative to the ground potential. A ground leakage current Ig is minimized by adjusting the values of the respective capacitances in an equivalent circuit so as to satisfy the relationship: C2/C1=Cp/Ca.

The invention relates to the field of sound absorbing materials used for buildings, and particularly relates to sound absorbing mortar and a sound absorbing material. The sound absorbing mortar mainly comprises, by weight, 70-80 parts of sand grains, 6-12 parts of silicate and 12-20 parts of water. The sound absorbing material is prepared from the sound absorbing mortar, can achieve large-area seamless decoration and has a good environment protection property. Through a manufacturing process, the particle size and a shaping manner of the sand grains can be accurately controlled, thus determining the size and the arrangement manner of inner pores. Silica sand plasterer slurry having various flow resistance and sound absorbing characteristics can be produced, has good absorbing effects on low-frequency and high-frequency noises, and can greatly decrease sound wave reflection. In addition, the sound absorbing material is high in strength and flame-retardant.

A multi-chip electronic module comprises a multiplicity of integrated circuit chips arranged in a vertical stack. Each chip includes at least one first electrical terminal, with at least a first subset of the first terminals being disposed at different heights relative to the stack. A multiplicity of second electrical terminals is disposed on a support member, and a multiplicity of first electrical conductors (e.g., wirebonds) is connected between the first subset and at least a second subset of the second terminals. In order to reduce the skew produced at relatively high frequencies, all of the first conductors have substantially the same inductive impedance at the frequency of operation of the module. Our invention is particularly well suited to modules that operate at frequencies of about 500 MHz or higher.

The invention discloses an embedded flotation froth image monitoring device based on a digital signal processor (DSP). The device is composed of an image acquisition device, an image processing core board module and a communication interface board module, the image acquisition device, the image processing core board module and the communication interface board module are integrated in a protective cover, and an image processing core board and a communication interface board are respectively realized through an independent board card and are connected through a bus slot. The calculation acquisition device is composed of a high resolution industrial video camera, a high frequency light source and double protective covers with a protection level of ingress protection (IP) 65. The calculation processing core board is mainly composed of a processor, and is used for real-time processing and analysis of images. The communication interface base board is used for transmitting the images to a video chip from the video camera, and being communicated with outside display equipment and an upper computer. The embedded flotation froth image monitoring device based on the DSP is used in the fields of monitoring, real-time processing and optimal control of mineral froth flotation processes.

The invention provides a radio frequency interference suppression method for a high frequency surface wave radar based on tensor subspace projection. Depending on the distance correlation and direction characteristics of radio frequency interference, joint estimation is performed on a radio frequency interference subspace from multiple dimensions by tensor decomposition. The implementation processcomprises the following steps: performing Doppler sliding window processing based on radar data to finish data segmentation; performing radio frequency interference detection; judging whether interference frequency points exist in a currently-selected data block or not; if radio frequency interference exists, constructing a third-order tensor by using long-distance metadata without sea echo of multiple antenna channels to serve as a training tensor; performing tensor decomposition on the training tensor by using high-order singular value decomposition; estimating a radio frequency interference subspace; and performing distance sliding window and subspace projection processing to obtain data without radio frequency interference. The method can suppress radio frequency interference to a great extent, improve data quality and retain a target signal completely, has a good application effect, improves the detection performance of a radar system, and has important practical application value.

The invention provides a method for outputting high-precision and high-frequency clock signals and an oscillating circuit. The oscillating circuit comprises a low-frequency oscillator, a high-frequency oscillator, a frequency regulator, a first input, a first output and a second output. Fine adjustment configuration signals are input into the low-frequency oscillator through the first input; the low-frequency oscillator outputs low frequency clock signals through the first output; meanwhile, the low frequency clock signals are input into the frequency regulator; the frequency regulator outputs automatic calibrating signals to the high-frequency oscillator through adjustment and compensation of the frequency regulator; finally, the high-frequency oscillator outputs the stable second output, namely high-frequency clock signals. Through the method for outputting the high-precision and high-frequency clock signals and the oscillating circuit, the high-precision and high-frequency clock signals can be output.

The invention discloses an unloading method based on high/low-frequency vibration load loading, and relates to the field of precise unloading of metal rods. High/low-frequency vibration loads include a high-frequency part with higher frequency and lower vibration amplitude, and a low-frequency part with lower frequency and higher vibration amplitude. One end of a rod with a V-shaped groove gap is fixed; and the high/low-frequency vibration loads are applied to the other one of the rod. The magnitudes and the speeds of the loads with two kinds of frequencies are reasonably controlled, so that the rod forms fatigue rupture at the position of the V-shaped groove gap under the effect of stress concentration. The characteristic that the high/low-frequency vibration loads can quickly enable metal materials to generate and expand cracks is adopted, and the unloading efficiency of metal rods is improved. Compared with the prior art, the technology is a green unloading technology, is high in efficiency, can largely reduce consumption of rods and cutters, and cannot generate defects such as sunk angles, rhombic distortion or horseshoe ports. Due to existence of the V-shaped groove, 45-degree chamfering angles will be formed at two ends of the unloaded rod.

The invention discloses a DC transformer based on a centralized multi-winding high-frequency transformer, and a control method of the direct-current transformer. The transformer comprises M DC transformer units with input ends connected in series and output ends connected in parallel, wherein the medium-voltage DC side input ports of the M DC transformer units are connected in series to form a medium-voltage DC side port of the DC transformer, and low-voltage DC side output ports of the M DC transformer units are connected in parallel to form a low-voltage DC side port of the DC transformer. The multi-winding high-frequency transformers among the DC transformer units are mutually independent; each DC transformer unit comprises N submodules, the inputs of which are connected in series and the outputs of which are connected in parallel, wherein N is greater than or equal to 3; the input filter capacitors Cini of the submodules are connected in series to form a medium-voltage DC side input port of the unit, and the output filter capacitors Coi are connected in parallel to form a low-voltage DC side output port of the unit. According to the transformer, the bidirectional transmission of power between the medium-voltage DC side and the low-voltage DC side can be realized by controlling a phase shift angle between primary and secondary side bridge arms of the transformer in each sub-module, and zero-voltage switching-on of all switch tubes is realized.