11 results about "Asymmetric waveform" patented technology

The invention discloses a waveform feature extraction method and system for irregular waveforms of a hyperspectral laser radar, and aims at solving the problem that asymmetric waveforms, weak echoes and overlapped echoes in multi-channel full-waveform laser radar signals are difficult to accurately decompose, modeling full-waveform signals collected by multiple spectral channels into superposition of echo components and background noise. A multi-channel waveform is preprocessed through noise threshold and pulse width combined constraint, the waveform position is determined by adopting a gravity center discrimination method, and time synchronization calibration of each channel signal is realized in combination with a multi-echo quality index. The method further utilizes a cubic B-spline function to carry out modeling on transmitted waveforms of all spectrum channels, carries out weighted accumulation on multi-channel echo signals to enhance weak echo signals, and adopts a multi-channel interconnection decomposition optimization strategy to realize accurate extraction of irregular waveform features under the constraint condition of keeping time parameters of sub-echoes of all the channels consistent.

An ion repulsive surface, comprises: a first plurality of elongated electrodes distributed along an axis, configured to receive a first RF voltage with an asymmetric waveform; and a second plurality o

The utility model provides a circuit for measuring asymmetric waveform alternating current, which is characterized in that the anode of a first switching diode is connected with an alternating current input end, the cathode of the first switching diode is connected with one end of a first current-limiting resistor, the other end of the first current-limiting resistor is connected with one end of a first capacitor, and the other end of the first capacitor is grounded; the negative electrode of the second switching diode is connected with the alternating current input end, the positive electrode of the second switching diode is connected with one end of the second current-limiting resistor, the other end of the second current-limiting resistor is connected with one end of the second capacitor, and the other end of the second capacitor is grounded. The other end of the second current-limiting resistor is connected with an alternating current output end; according to the utility model, the positive half-wave rectification circuit and the negative half-wave rectification circuit are adopted, asymmetric alternating current is superposed and integrated, the change condition of the asymmetric alternating current is effectively displayed, and the change condition of real current can be reflected.

The application discloses a method and device for hydrogen production by electrolysis of water. The anode and cathode electrode materials are clamped in the anode clamp and cathode clamp respectively, and the electrolyte is injected to immerse the electrode clamp. After adjusting the distance between the two electrodes to the preset reference distance, the electrolysis voltage is applied to start the reaction. The high-frequency oscillation mechanism drives the two electrodes to do reciprocating oscillation with the reference distance as the center. The oscillation frequency matches the inherent characteristic frequency of the electrode surface flow boundary layer. The fast-shrinking slow-expanding asymmetric waveform is adopted, and the amplitude does not change the macroscopic working distance between the two electrodes. The transient electrochemical signals are synchronously collected to correct the oscillation frequency, and the hydrogen and oxygen gases generated in the reaction are collected. The application can strengthen the ion mass transfer of the electrode interface, realize the early directional separation of bubbles, effectively improve the electrolysis efficiency, and adapt to multiple types of electrolyte and variable load working conditions.

The application discloses a short-wave asymmetric chain establishment communication method, device and equipment, comprising: a calling party and a called party agreeing on a synchronous or asynchronous chain establishment mode and a frequency set; the calling party sending a chain establishment request of a robust waveform; the called party receiving the chain establishment request, selecting a robust waveform or a fast waveform to send a chain establishment response according to a signal-to-noise ratio and a Doppler spread of a received signal; the calling party receiving the chain establishment response and sending data; the called party receiving the data and sending a data response; the calling party sending an interactive inquiry of a waveform consistent with the chain establishment response waveform; and the called party receiving the interactive inquiry and sending an interactive response of a waveform consistent with the interactive inquiry waveform. The asymmetric waveform chain establishment technology is used to improve the anti-interference ability of chain establishment and accelerate the chain establishment process, and the anti-interference is reflected in different preamble sequences of the robust waveform and the fast waveform. The asymmetric waveform chain establishment technology can also be applied to relay networking to enhance the anti-interference of chain establishment of the relay networking, and is compatible with a traditional chain establishment mode.

The application discloses a segmented cylinder structure high-field asymmetric waveform ion mobility tube, which comprises a left and right open cylinder-shaped insulating outer cylinder and a cylindrical insulating inner column located in the insulating outer cylinder, an ionization source is arranged near the left end port of the insulating outer cylinder, and an ion receiving electrode is arranged near the right end port in the insulating outer cylinder; two pairs and more than two pairs of segmented separation electrode pairs (including the first, second,..., and Nth electrode pairs) are arranged between the ionization source left end port and the ion receiving electrode; the electrodes located in the inner side of the insulating outer cylinder in the first, second,..., and Nth electrode pairs are applied with different direct current voltages and the same high-field asymmetric radio frequency voltage, and the electrodes corresponding to the outer surface of the insulating inner column are applied with direct current voltage, and the working gas pressure range is 10 pascal to 1 atmosphere; the ion movement speed in the X-axis direction can be reduced, and the resolution is improved; the insulating outer cylinder, the insulating inner column and the two electrodes in the segmented separation electrode pair are coaxially arranged.

The application discloses a water level sine wave identification and stack moving average cooperative wave elimination method and system, relates to data processing and hydrological monitoring, and comprises the following steps: a first-in-first-out stack with a length of L is established, and collected water level data is pushed into the stack; a fitting model with offset correction is established on a zero mean sequence, wherein a waveform center line offset amount is introduced in the fitting model; extreme points of all water level data in a window corresponding to the stack are detected, a time interval between adjacent wave peaks and wave troughs is calculated, and a half period is determined; the waveform center line offset amount is solved based on the half period and the fitting model; and cooperative wave elimination is performed according to the solved waveform center line offset amount and the collected water level data. The application identifies and eliminates the problem of unequal residual positive and negative deviations caused by asymmetric waveforms, and solves the problem of the non-ignorable systematic drift in long-term water level monitoring.

The present application relates to the technical field of drill bit, in particular to a small-diameter deep-hole stepped drilling method and drill bit. It comprises a guiding and centering part, a stepped cutting part and a tool shank part connected in sequence, and the tool body is provided with main chip removal grooves and auxiliary shearing grooves with different lead angles, and the grooves are staggered in phase. The drill bit axis is provided with a high-pressure internal cooling channel, and a micro radial jet hole with a specific back-swept angle is arranged near the rear flank surface of each cutting part. The self-adaptive drilling method matched with the drill bit automatically switches to a high-frequency pulsating feed mode when the spindle load increases by real-time monitoring of the spindle load, so that the feed speed fluctuates periodically according to an asymmetric waveform. Through the synergistic effect of mechanical shearing, directional jet and feed pulsation, the present application realizes the instant breaking, directional discharge and effective cooling of chips, solves the problems of chip removal blockage, insufficient cooling and poor precision in small-diameter deep-hole stepped machining, and significantly improves the machining efficiency, coaxial accuracy and tool life.

The application discloses a segmented flat structure high-field asymmetric waveform ion mobility tube and application, which comprises a left-right two-end opening rectangular cross-section insulating cylinder body, the lower wall surface of the cylinder body is an insulating lower plate, and the upper wall surface of the cylinder body is an insulating upper plate; an ionization source is arranged between the insulating lower plate and the insulating upper plate and close to the left end port of the cylinder body, a pair of isolation ground electrodes and a pair of ion receiving electrodes are arranged between the insulating lower plate and the insulating upper plate and close to the right end port, two pairs or more than two pairs of opposite segmented electrode pairs are arranged between the ionization source and the pair of isolation ground electrodes and on the upper surface of the insulating lower plate and the lower surface of the insulating upper plate, the working gas pressure range is 10 pascal to 1 atmosphere, and the ion movement speed in the X-axis direction can be reduced, and the separation capacity is improved.

The application discloses a high-field asymmetric waveform ion mobility spectrometry-ion trap mass spectrometry combined device, which comprises a sealed container, a pair of plane electrodes arranged in the sealed container, and the surfaces of the two electrodes of the pair of plane electrodes are perpendicular to an X axis; a plate Y electrode pair and a plate Z electrode pair are arranged between the pair of plane electrodes, the plate Y electrode pair and the plate Z electrode pair are composed of two rectangular plate-shaped electrodes which are arranged in parallel and are spaced apart, and the surfaces of the electrodes of the plate Y electrode pair and the plate Z electrode pair are perpendicular to a Y axis and a Z axis respectively; an ionization source, an ion outlet of the ionization source is above a region between a high-voltage electrode and a left end electrode and faces the region between the high-voltage electrode and the left end electrode; and a gas suction pump, a gas inlet of the gas suction pump extends into a region between the plate Y electrode pair or the plate Z electrode pair and the left end electrode through a wall surface of the sealed container. Through the pre-separation function of the high-field asymmetric waveform ion mobility spectrometry, non-target compound ions are prevented from entering the ion trap, so that the resolution and peak position stability of the ion trap are ensured.

This invention discloses an asymmetric waveform operation method for a DC-DC converter, comprising the following steps: Step 1, designing an asymmetric AC voltage waveform; Step 2, designing an asymmetric AC current waveform; Step 3, designing an optimal asymmetric AC current waveform; and Step 4, designing a control method for asymmetric waveform operation. This invention adjusts the distribution of the number of modules within the DC-DC converter across different branches by designing the asymmetric AC voltage waveform, ensuring a constant total number of modules. By designing the asymmetric AC current waveform, it reduces the AC current amplitude on the DC current component side of the devices, thereby reducing the peak current of the devices and increasing power capacity. This invention can significantly improve the transmission power capacity of the DC-DC converter without changing its circuit structure and the number of devices, which is of great significance for the application of existing DC-DC converter topologies in DC power grids.