26 results about "Selective pulse" patented technology

The invention belongs to the technical field of nuclear magnetic resonance detection, and particularly relates to a method for detecting fluorine ions in an ion exchange membrane and application of the method. The method comprises the following steps: (1) soaking an ion exchange membrane to prepare a sample, winding the sample on a bar, and loading the sample into the bottom of a nuclear magnetic tube in a screw-in manner; the shape of the sample is a polygon, the polygon has a symmetrical structure, and the number of edges is not less than 4; (2) putting the nuclear magnetic tube prepared in the step (1) into a nuclear magnetic resonance spectrometer, selecting a pulse sequence, tuning, shimming, adjusting nuclear magnetic resonance test parameters, and collecting signals; the nuclear magnetic resonance test parameters comprise: 90-degree pulse width is 9-15 [mu] s; and the power is 20-55W. The pulse width of a nuclear magnetic sample obtained by adopting a specific sample preparation method at 90 degrees is 9-15 microseconds; under the power of 20-55W, < 19 > F in a bulk phase of the ion exchange membrane can be detected, and a powerful support is provided for detecting and analyzing structural information in the bulk phase of the ion exchange membrane.

The invention relates to the technical field of LED display screens, and discloses an LED display screen pixel uniformity compensation algorithm and an implementation method, and the method comprises the steps: collecting photoelectric response data of a target pixel and horizontal and vertical adjacent pixels in an LED display screen; performing chromatic aberration deviation analysis on the target pixel based on the photoelectric response data to obtain a pixel difference value; a pulse modulation mode is selected based on the pixel difference value, driving control is carried out through a pulse hybrid modulation circuit according to the pulse modulation mode, the pulse modulation mode is a PAM modulation mode or a PWM modulation mode, and according to the method, the PAM modulation mode or the PWM modulation mode is intelligently selected according to the pixel deviation degree through the pulse hybrid modulation driving technology. The technical problems under different compensation requirements are effectively solved, and the response speed and the control precision of pixel uniformity compensation of the LED display screen are ensured.

The embodiment of the present application provides a laser communication modulation method and system thereof, which can solve the technical problem of poor sensitivity of free-space laser communication under extremely low signal-to-noise ratio conditions. The method includes performing polarization-selective modulation on a coding sequence to obtain multiple groups of linearly polarized light pulses. Each group of linearly polarized light pulses is sent to different photon detectors through different channels to obtain a first photon count and a second photon count. According to the first photon count and the second photon count of all groups of linearly polarized light pulses, a log-likelihood ratio is obtained through soft decision. Then, the original information prediction value is obtained through channel decoding. In this way, polarization-selective pulse position modulation and its corresponding demodulation method can obtain better communication sensitivity and stronger resistance to background noise compared to PPM‑PC. In addition, optical signals in different polarization states carry different data respectively, and are then transmitted in sequence, with a high transmission rate.

This disclosure is directed to devices, systems, and techniques for delivering electrical stimulation. In some examples, a system includes processing circuitry configured to: receive information representative of a bioelectric brain signal recorded from a brain of a patient; and determine, based on the information, at least one pathological frequency of the bioelectric brain signal. Additionally, the processing circuitry is configured to select, based on the at least one pathological frequency, a sequence of pulse bursts at a pulse burst frequency, the sequence of pulse bursts at least partially defining electrical stimulation deliverable to an area of a brain of a patient, wherein adjacent pulse bursts within the sequence comprise different intra-burst pulse frequencies; and control a medical device to deliver the electrical stimulation comprising the sequence of pulse bursts to the area of the brain of the patient.

The present disclosure relates to a laser device with multi-mode capabilities, enabling the performance of surgical procedures without the need to use multiple lasers. The laser device includes a signal generator configured to generate a laser control signal. The laser device also includes a laser source configured to receive the laser control signal and emit a laser beam responsive to receiving the laser control signal and in accordance with the laser control signal. Additionally, the laser device includes control circuitry. The control circuitry is configured to receive a user request to operate in either a pulsed-wave mode, a quasi-pulsed-wave mode, a continuous-wave mode, or a quasi-continuous-wave mode. The control circuitry is also configured to cause the signal generator to generate the laser control signal in accordance with the requested mode, thereby causing the laser source to emit a pulsed-wave laser, a quasi-pulsed-wave laser, a continuous-wave laser, or a quasi-continuous-wave laser.

The application relates to the technical field of LED display screens and discloses an LED display screen pixel uniformity compensation algorithm and an implementation method, wherein the method comprises the following steps: collecting photoelectric response data of a target pixel and horizontally and vertically adjacent pixels of the target pixel in an LED display screen; performing chromatic aberration deviation analysis on the target pixel based on the photoelectric response data to obtain a pixel difference value; selecting a pulse modulation mode based on the pixel difference value, and driving and controlling the target pixel through a pulse hybrid modulation circuit according to the pulse modulation mode; and the pulse modulation mode is a PAM modulation mode or a PWM modulation mode. The method intelligently selects a PAM or PWM mode according to the pixel deviation degree by using a pulse hybrid modulation driving technology, effectively solves technical problems under different compensation requirements, and ensures the response speed and control precision of LED display screen pixel uniformity compensation.

The invention relates to a method for detecting an electrical control variable (IU, IV, IW) in a pulse-width-modulated, multi-phase electric motor (4), in which method: at least one pulse-width-modulated signal pulse (PU, PV, PW) is generated for each phase (U, V, W) of the electric motor (4) in the course of a pulse-width modulation within a period (T); and, during a measurement time interval (62), at least one minimum duty cycle is set for each phase (U, V, W), and a pulse position is selected for each phase (U, V, W) such that the pulse edges of the signal pulses (PU, PV, PW) do not overlap with the measurement time interval (62), and the control variable (IU, IV, IW) is measured during at least one pulse period (T).

Techniques, systems and apparatus are described for magnetic resonance imaging. A method includes applying a radio frequency (RF) signal of a predetermined time duration towards a target, wherein the RF signal comprises a composite pulse that includes a velocity-selective pulse comprising RF pulses whose phase shift is modulated over the predetermined time duration, acquiring a magnetic resonance signal from the target resulting from the application of the RF signal, and generating an MRI image of the target from the magnetic resonance signal.

In one embodiment, a system for semiconductor fabrication includes a continuous wave (CW) radio frequency (RF) source and a pulsing RF source. The system further includes a matching network positioned between the CW RF source and the load and a control circuit. The control circuit receives one or more signals indicative of the pulsing RF signal, and selects a portion of the pulsing RF signal. The control circuit then samples at least one parameter during the selected portion of the pulsing RF signal. Based on the at least one parameter, the control circuit causes an alteration of the at least one variable reactance element, which causes the matching network to impedance match between the CW RF source and the load.

Aspects presented herein can enable a UE to avoid its UWB communication interfering with a GNSS receiver. In one aspect, a UE detects a set of satellite signals of at least one satellite communication channel. The UE identifies a frequency of the set of detected satellite signals in the at least one satellite communication channel. The UE selects a pulse repetition frequency (PRF) for ultra-wideband (UWB) communication of the UE, where the selected PRF is not an integer multiple of the identified frequency of the set of detected satellite signals in the at least one satellite communication channel. In some examples, the UE can also perform the UWB communication based on the selected PRF and receive the set of detected satellite signals, where the performance of the UWB communication and the reception of the set of detected satellite signals are concurrent.

This invention belongs to the field of nuclear magnetic resonance (NMR) detection technology, specifically relating to a method and application for detecting lithium ions in an ion exchange membrane. The detection method includes (1) preparing a sample from an ion exchange membrane after soaking, winding the sample onto a uniform rod, and inserting the sample into the bottom of an NMR tube using a screw-in method; the sample shape includes a polygon with a symmetrical structure and at least 4 sides; (2) placing the NMR tube obtained in step (1) into an NMR spectrometer, selecting a pulse sequence, tuning and shimming, adjusting the NMR test parameters, and acquiring the signal; the NMR test parameters include: a 90° pulse width of 10–14 μs; and a power of 30–55 W. The NMR sample obtained by this invention using a specific sample preparation method can detect 7Li inside the ion exchange membrane bulk phase at a 90° pulse width of 10–14 μs and a power of 30–55 W, providing strong support for the detection and analysis of structural information within the ion exchange membrane bulk phase.

This application discloses an electrical stimulation pulse signal selection device, apparatus, and medium, applicable to the field of medical rehabilitation. The device includes: an acquisition module for acquiring electromyographic (EMG) signals from electrodes on the healthy and affected sides; a screening module for feature screening of the EMG signals; a difference module for performing difference processing on the feature screening results corresponding to the healthy and affected sides; and a selection module for selecting an electrical stimulation pulse signal based on the difference processing result. By using the acquired EMG signals, feature screening is performed, and the feature screening results corresponding to the healthy and affected sides are processed by difference. Based on the difference processing result, a corresponding electrical stimulation pulse signal is selected to achieve treatment of the affected side. Selecting the electrical stimulation pulse signal after processing the actual measured data is more accurate than the traditional method of subjective pulse signal selection by physicians or patients, and avoids muscle over-fatigue, muscle spasms, etc.

The utility model relates to a detection system and a metal continuous casting system. The detection system monitors and / or controls liquid metal during a metal manufacturing process. The system includes an electromagnetic sensor with an excitation coil and a receiver, an AC current unit for energizing the excitation coil, a synchronization circuit, and a controller. The synchronization circuit includes an input terminal that receives an AC phase voltage from the three-phase power supply and outputs a pulse sequence having a pulse sequence frequency fP, fP = M * fAC, M is an integer and M > = 1, fAC is a frequency of an AC cycle associated with the AC phase voltage. The controller is configured to control the electromagnetic sensor in a batch mode including successive batch cycles, each batch cycle including a first time window to energize the excitation coil and acquire the response signal and a second time window to de-energize the excitation coil. The controller is configured to receive a sequence of pulses and start a first time window by selecting a pulse from the sequence of pulses for each batch cycle and triggering activation of the AC current unit with the selected pulse.

The application discloses a kind of nuclear magnetic resonance pulse data's framing method, framing ware and nuclear magnetic resonance spectrometer, it is related to nuclear magnetic resonance technical field.Framing method includes: obtaining the nuclear magnetic resonance pulse data to be framed;Using fixed length coding mode, according to the data type of nuclear magnetic resonance pulse data to be framed, nuclear magnetic resonance pulse data to be framed is framed into independent event frame, or framed into the shaping envelope data frame different from event frame structure, wherein, event frame includes at least one of emission event frame, receiving event frame and delay event frame.Thereby, the FPGAs parsing complex, timing deviation problem caused by variable length framing in the prior art can be overcome, while solving the defect that envelope data cannot be reused and frame data volume is large caused by selective pulse envelope data and emission instruction mixed coding, so as to reduce the complexity of transceiver processing, improve the stability and flexibility of nuclear magnetic resonance detection.

Embodiments herein relate to filtration systems that can pulse clean filter elements selectively, in specific patterns, to enhance cleaning efficacy. In an embodiment, a filtration system is included having a plurality of filter element mounts configured to retain filter elements, a compressed gas supply, and a plurality of valves in fluid communication with the compressed gas supply. The system further including a control circuit configured to control actuation of the plurality of valves. The system can operate in a first mode and a second mode. Wherein operating in a first mode includes opening valves according to a first valve actuation pattern and operating in a second mode includes opening valves according to a second valve actuation pattern. The system can be configured to periodically switch from the first mode to the second mode and compare the efficacy of the two modes. Other embodiments are also included herein.

The present disclosure relates to an ultrasonic generator with variable PWM independent of the supply voltage, having a switching unit with an input for a supply voltage and an output for a switching voltage, a coupling element connected to the output, having a coupling output for a transducer voltage, a transducer for generating ultrasonic waves at a transmission power, a series circuit consisting of the input, the output and the switching element, wherein a control unit controls the switching element with a PWM signal having a pulse duty cycle, which is selected in dependence on a parameter related to the transmission power, such that the transmission power corresponds to a predetermined transmission rating independently of the value of the supply voltage. The ultrasonic boundary sensor and the ultrasonic reflection sensor have the ultrasonic generator. In a method for operating the ultrasonic generator, a transmission rating is set and the pulse duty cycle is selected on the basis of the parameter such that the transmission power corresponds to the transmission rating independently of the value of the supply voltage.

The sequence control circuitry repeatedly performs a first data acquisition for acquiring first data, using a first MRS pulse sequence including a first means based on a first pattern that includes frequency selective pulses, and a second data acquisition for acquiring second data, using a second MRS pulse sequence including a second means for selecting a second pattern that differs from the first pattern and includes frequency selective pulses. The frequency selective pulses make selection frequencies of frequency selective pulses before and after an excitation pulse differ and / or are optimized to make (tTE−tJ) differ from tJ wherein tJ is a time between the frequency selective pulses and tTE is an echo time.

The present invention provides a display device that can suppress the increase in line memory even when employing an overlap scan drive method. [Solution] The display device comprises a plurality of pixels arranged in a matrix having a plurality of pixel rows and a plurality of pixel columns, a plurality of scan signal lines, each associated with one of the plurality of pixel rows, a plurality of display signal lines, each associated with one of the plurality of pixel columns, a scan signal line drive circuit that supplies scan signals to the plurality of scan signal lines, each containing a selection pulse for selecting one of the plurality of pixel rows, and a display signal line drive circuit that supplies display signals to the plurality of display signal lines, wherein the scan signal line drive circuit is configured to make at least one horizontal scanning period near the beginning of a frame shorter than other horizontal scanning periods, including the first horizontal scanning period of a plurality of horizontal scanning periods that exist from the start of the frame at the input of the scan signal line drive circuit until the selection pulse supplied to the first scan signal line falls.

The invention relates to the technical field of remote sensing data acquisition, and discloses an unmanned aerial vehicle-mounted hyperspectrometer large-water-surface amphibious plant pattern spot acquisition device and method, and the device comprises a front light splitting and polarization decoupling module, a dual-channel synchronous hyperspectral imaging module, a self-adaptive spatial light field modulation illumination module, and an on-satellite real-time processing and control module. The method comprises the following steps: synchronously acquiring spectral images of an orthogonal polarization channel and carrying out decoupling calculation to separate solar flares on the water surface in real time so as to obtain flare-free diffuse reflection spectral data; then, a signal-to-noise ratio zoning graph is generated based on the data, and a lighting module is driven to carry out selective pulse light supplement on the recognized low-signal-to-noise-ratio area according to the signal-to-noise-ratio zoning graph; and finally, collecting and extracting an active reflection signal through time gating, fusing the active reflection signal with the flare-free data, and outputting the fused active reflection signal. According to the method, flare interference can be effectively removed, dark and weak target signals can be adaptively enhanced, and the quality and the automation level of hyperspectral data acquisition in a complex water area environment are improved.

Method for detecting radar lobes from a plurality of electromagnetic pulses collected by an electronic warfare antenna system. This method consists of: selecting a pulse ( ) whose amplitude ( ) is a local maximum in a time sequence of pulses, as the reference pulse ( ); defining a search domain (D) in the parameter space of a parametric family of parabolas modeling pulses emitted by the passage of a radar lobe through an observed electromagnetic scene, the search domain taking into account the arrival time and amplitude of the reference pulse; identifying parameters of an optimal parabola from the parametric family of parabolas by a simulated annealing process traversing the search domain; and grouping pulses close to the optimal parabola as pulses belonging to the same radar lobe. Figure for the abstract: Figure 1

The invention relates to a method for detecting an electrical controlled variable (lu, Iv, Iw) in a pulse-width-modulated and multi-phase electric motor (4), in which method at least one pulse-width-modulated signal pulse (Pu, Pv, Pw) is generated for each phase (U, V, W) of the electric motor (4) during a period (T) in the course of pulse width modulation, and in which at least one minimum duty cycle is set for each phase (U, V, W) during a measuring period (62), a pulse position is selected for each phase (U, V, W) such that the pulse edges of the signal pulses (Pu, Pv, Pw) do not overlap with the measuring period (62), and the controlled variable (lu, Iv, Iw) is measured during at least one pulse period (T).

The present invention discloses a method and system for selecting parameters of a pulse power supply system, belonging to the technical field of pulse power supply systems. The method includes the following steps: S1: Collect historical data on the state of the pulse power supply system; S2: Process the historical data on the state of the pulse power supply system; S3: Train an optimal numerical model for selecting parameters of the pulse power supply system; S4: Select the optimal parameters of the pulse power supply system according to the user's energy output requirements for the pulse power supply system; S5: Interface display: Visually display the optimal parameters of the pulse power supply system to the user. The present invention solves the problem that the existing pulse power supply system cannot flexibly select parameters according to user needs, resulting in poor use effect of the pulse power supply system and reducing the performance and reliability of the pulse power supply system. The present invention can flexibly select the parameters of the pulse power supply system according to user needs, improve the use effect of the pulse power supply system, and enhance the performance and reliability of the pulse power supply system.

A photoelectric conversion apparatus includes a plurality of pixels arranged in a matrix, and a control circuit configured to control the plurality of pixels. Each of the plurality of pixels include a photoelectric conversion unit configured to generate a signal charge, a floating diffusion unit, a transfer transistor configured to transfer the signal charge to the floating diffusion unit, and a transistor configured to be electrically connected to the floating diffusion unit. The control circuit outputs a row selection pulse configured to select the pixel arranged in a row direction, and a pixel control pulse having a rise time longer than a rise time of the row selection pulse. The pixel control pulse is entered to a gate of the transistor.

The embodiment of the present invention discloses a pulse number self-correction control device, method and fiber laser, which includes a signal output circuit, a signal delay circuit, an acousto-optic modulation driver and a coupling pulse circuit. The acousto-optic modulation driver is used to select an optical pulse signal from the seed optical signal output by the signal output circuit; the coupling pulse circuit is used to convert the optical pulse signal into an electrical pulse signal; the signal delay circuit is used to identify the pulse number of the electrical pulse signal and adjust the delay time of the acousto-optic drive signal that drives the acousto-optic modulation driver according to the pulse number, so that the pulse number of the optical pulse signal selected by the acousto-optic modulation driver is consistent with the preset pulse number. The embodiment of the present invention uses the optical pulse signal selected by the acousto-optic modulation driver as the effect feedback for adjusting the acousto-optic drive signal, thereby adjusting the delay of the acousto-optic drive signal, realizing self-calibration of the frequency-selective pulse, and improving the reliability and accuracy of the frequency-selective pulse calibration.

The application provides a pulse and radio frequency ablation integrated machine, which comprises a pulse and radio frequency generator, a positive electrode socket and a negative electrode socket, a switching switch, a catheter, a distal head electrode and a proximal head electrode; the pulse and radio frequency generator has both pulse and radio frequency ablation functions, and the interface thereof can select pulse and radio frequency; the distal and proximal head electrodes are connected with the switching switch, and the switching switch controls the conduction and disconnection between the distal and proximal head electrodes; the pulse and radio frequency generator is connected with the distal and proximal head electrodes through the positive electrode socket and the negative electrode socket respectively, so that the positive and negative electrodes can be separated; when the switching switch is disconnected, the distal and proximal head electrodes are disconnected and connected to the pulse and radio frequency generator through the positive electrode socket and the negative electrode socket respectively, and the distal and proximal head electrodes discharge between each other to realize pulse or radio frequency ablation. The application realizes the selective use of pulse and radio frequency ablation and is safer.

The invention belongs to the field of nuclear magnetic resonance technology detection, and particularly relates to a detection method and application of lithium ions in an ion exchange membrane. The detection method comprises the following steps: (1) preparing a sample from a soaked ion exchange membrane, winding the sample on a uniform bar, and loading the sample into the bottom of a nuclear magnetic tube in a screw-in manner; the shape of the sample comprises a polygon with a symmetrical structure and no less than 4 edges; (2) putting the nuclear magnetic tube prepared in the step (1) into a nuclear magnetic resonance spectrometer, selecting a pulse sequence, tuning, shimming, adjusting nuclear magnetic resonance test parameters, and collecting signals; the nuclear magnetic resonance test parameters comprise that the 90-degree pulse width is 10-14 [mu] s; and the power is 30-55W. The pulse width of a nuclear magnetic sample obtained by adopting a specific sample preparation method at 90 degrees is 10-14 microseconds; under the power of 30-55W, 7Li in the ion exchange membrane bulk phase can be detected, and a powerful support is provided for detecting and analyzing structural information in the ion exchange membrane bulk phase.