92 results about "Weak pulse" patented technology

In a memory using spin transfer torque, state of the spin is made unstable by applying a weak pulse before rewriting to reduce rewrite current. Reading of high-speed operation is performed with current in a regime where the current becomes non-linearly increases corresponding to the pulse width to suppress disturb. Further, fluctuation of respective memory cells is suppressed by a driving method setting the amount of spin constant by bit line charge to suppress read disturb.

The invention discloses a comprehensive security monitoring method and a comprehensive security monitoring system based on a sentry. The comprehensive security monitoring method includes the following implementation steps: 1) setting a sleep pulse critical value, a life weak pulse critical value and a human movement sign critical value; and 2) collecting pulse and human movement signs of sentry security personnel in real time. Security monitoring alarm is achieved according to three factors of the pulse, the human movement signs and manually triggered alarm, a sentry site video is collected through a camera during the triggered alarm, and alarm and the site video collected by the camera are sent to a monitoring center. The comprehensive security monitoring system comprise the monitoring center and at least one sentry unit, the sentry unit comprises a video monitoring unit, a sentry base station and at least one security personnel terminal, the video monitoring unit comprises the camera with a rotary platform, and the security personnel terminal comprises a pulse sensor, an attitude sensor, an alarm button, a terminal controller and a terminal wireless module. The comprehensive security monitoring method and the comprehensive security monitoring system based on the sentry have the advantages of being good in security, high in reliability, accurate in video monitoring and simpleand convenient to use.

The invention relates to the technical field of digital welding of aluminum magnesium alloy, in particular to a welding method for setting double pulse welding parameters based on a mathematical model, and discloses a method for realizing welding by a fixed frequency and variable frequency calculation method of a double pulse metal-inert gas (MIG) welding wave form which is designed based on the mathematical model. Continuous adjustable change is performed according to a certain rule based on basic values a and b of strong and weak pulse groups, numbers n1 and n2 of strong and weak pulses are subjected to assistant adjustment, and a welding current range can be effectively expanded, so that the welding current in a wider range can be adjusted continuously. Meanwhile, at the transition stage of the strong and weak pulses, a gradual change mode is adopted by the pulse basic values to ensure that the transition of the strong and weak pulses is smoother, and the welding process is more stable.

The invention discloses a near infrared weak pulse spectral radiance calibration device which belongs to the technical field of optical metrology. The device comprises a light source component which is used for grating spectrometer calibration, an optical fiber component with an array optical fiber bundle, a computer provided with a spectral radiance calibration data processing software package and a grating spectrometer with a flat field concave surface grating and a surface array EMCCD. The input end of the array optical fiber bundle is a single optical fiber, and the output end comprises n optical fibers in line arrangement. A pulse light beam emitted by a measured pulse light source passes through the optical fiber component and a slit, and is dispersed by the flat field concave surface grating. Dispersed lights are focused onto the photosensitive surface of the surface array EMCCD to form n rows of line spectrum. The computer collects n rows of line spectrum, acquires the spectral radiance value of the measured pulse light source changing with wavelength according to a spectral radiance calculation formula, and shows a single width or multi width spectral radiance curve on a computer screen. The device provided by the invention solves the problem of difficult calibration of the spectral radiance of a near infrared weak pulse light source, and has a broad application prospect.

The invention relates to an optical signal detection technology, in particular to a device and a method for eliminating a back light signal by utilizing a dual-optical switch. The invention solves the problem that the existing back light restraining technology can not eliminate the back light signal which is synchronous with a pulse laser signal and has the same frequency with the pulse laser signal. The device for eliminating the back light signal by utilizing the dual-optical switch comprises a pulse laser, a practice target, the dual-optical switch, a single photon detector and a computer, wherein the dual-optical switch comprises a first acoustic optical modulator and a second acoustic optical modulator; the external trigger input end of the pulse laser is connected with a pulse signal generator; and the external trigger input end of the pulse signal generator is connected with a function signal generator, and the output end of the pulse signal generator is connected with a time-to-amplitude converter. The invention solves the problem that the existing back light restraining technology can not eliminate the back light which is synchronous with the pulse laser signal and has the same frequency with the pulse laser signal, and is suitable for weak pulse laser signal detection in the fields of precision measurement, communication, information processing, military and the like.

The invention discloses an airborne laser waveform data decomposition method considering adjacent waveform information. The method comprises the following steps of: (A), preprocessing waveform data; (B), detecting the pulse wave crest of the waveform data; (C), extracting a significant pulse crest based on a generalized Gaussian model; (D) extracting a candidate pulse crest considering an adjacent waveform; (E) generating a list of the waveforms to be analyzed based on a regional growth strategy; and (F) outputting a waveform decomposition result. According to the method, a high threshold value and a low threshold value are adopted, so that the defect that a single threshold value is difficult to select properly can be overcome, and weak pulse signals in the waveform data can be considered effectively; during waveform decomposition, the candidate pulse crests of the waveforms to be analyzed are analyzed by continuously utilizing the reliable information provided by the significant pulse crests of the adjacent waveforms in a regional growth way, so the robust extraction of the weak pulse crest information can be realized; and therefore, complete point cloud information is acquired.

The invention discloses a method for detecting weak pulse signals. The method includes the following steps that: one-dimensional multi-scale wavelet decomposition is performed on measured signals, namely, the measured signals are decomposed into N layers through one-dimensional wavelet transform, and the high-frequency portions of the signals are reconstructed through utilizing a wavelet decomposition coefficient, so that N high-frequency reconstruction signals dj and one low-frequency reconstruction signal a are obtained; sliding kurtosis processing is performed on the reconstruction signals dj, so that a corresponding sliding kurtosis time sequence cj can be obtained; and superimposing synthesis and normalization processing are performed on the sliding kurtosis time sequence cj, so that a final sliding kurtosis time sequence c can be obtained. After being subjected to the one-dimensional multi-scale wavelet decomposition preprocessing, the measured signals embody different time-frequency domain characteristics in different decomposition scales, and when the sliding kurtosis processing is performed on the signals, a detection effect of multi-slide window synchronization action can be realized, and therefore, differential analysis and processing on noises, interferences and pulses to be detected mixed in measured signals can be benefitted.

The invention discloses power line carrier communication modules with power grid topology sensing function. The modules comprise a voltage dual channel phase detecting unit, a characteristic quantitypulse current transmitting unit, a characteristic current signal detecting unit, a dual mode communication unit, and a central processing unit, wherein the power line carrier communication module of asensing node and the power line carrier communication module of a sensed node establish a data and command interaction by using a dual mode communication mode, the voltage dual channel phase detecting unit generates a phase synchronization signal, the characteristic quantity pulse current transmitting unit of the sensing node generates and transmits a characteristic quantity pulse current signalof measuring the topology, the sensed node detects the weak pulse current signal in the power grid line network and transmits the signal to the central processing unit, and the central processing unitestablishes the topology of the power grid through data calculation. The invention realizes the automatic physical topology identification of the power grid.

The present invention discloses a kind of electrode type digital liquid level controlling device. Weak pulse signal detected by the sensor probe is treated before it is fed to digital pulse signal inA/D converter and used for logic operation and judgment in central controller to complete intelligent control. The present invention has stable running, low operation cost, strong antijamming capacity and low power consumption, and may be used in the intelligent control of various water supply and draining system.

An all-optical method of regenerating an optical return-to-zero format pulse signal of a first wavelength starts by introducing the input signal into a first end of a non-linear optical fiber to obtain a modified signal comprising pulses broadened in the wavelength domain. When this modified signal emerges from the second end of said non-linear optical fiber, a bandwidth slice is selected that is centered on a second wavelength so spaced from the first wavelength that its intensity is substantially unresponsive to weak pulses in the signal and relatively insensitive to intensity for other pulses. This slice is returned to the same non-linear optical fiber at its second end so that a further modified signal comprising pulses broadened in the wavelength domain will emerge from its first end. From this further modified signal a bandwidth slice centered on the first wavelength is selected as regenerated output. Regenerators operating in this way are also disclosed.

The invention discloses a method and a circuit for detecting energy segmentation of a specific radioactive nuclide. The method is characterized in that a sodium iodide (NaI) crystal and a photomultiplier are used for forming a detector assembly, a high-energy ray is converted to a weak pulse signal, the weak pulse signal is amplified and shaped by a signal amplification circuit into a signal of a certain amplitude to be supplied to a subsequent circuit, the signal after being amplified and shaped is outputted to an upper discrimination threshold and lower discrimination threshold judgment circuit consisting of two low-bias voltage high-speed comparators, a benchmark source is generated by a high-precision low-temperature-drift integration voltage benchmark source circuit, the comparison voltage is supplied to the comparator after being adjusted by a precise potentiometer, and an adjusting potentiometer adjusts the upper discrimination threshold voltage and the lower discrimination threshold voltage. The method and the circuit have the advantages that the hardware is simple and easy, measurement with certain precise can be completed only by a small-sized detector, no large-sized shielding chamber is needed, the cost of the quantitative detection instrument is greatly reduced, and the quantitative detection instrument of the specific nuclide can be purchased by common consumers.

The invention provides a wrist strap type infrared pulse measurement method, relates to the field of pulse measurement, in particular to wrist pulse wave measurement utilizing infrared reflection technologies and aims at solving the problem that by adopting an existing measurement mode, measurement at the wrist position with a few blood vessels is inaccurate and the user body condition cannot be actively monitored in real time during finger pulse measurement. The wrist strap type infrared pulse measurement method comprises the steps of transmitting measured wrist position weak pulse wave signals to a pulse wave signal extracting circuit and an analog-digital converter, then performing characteristic quantity extraction and matched filtering on the digital pulse wave signals through a signal processing unit to obtain effective pulse wave signals, and performing statistical average on the pulse wave signals meeting the relevance requirement to obtain the pulse times of a measured person. The problem that the result deviation is large after the weak pulse wave signals are counted in an existing measurement mode is effectively solved, and a pulse measurement device designed by adopting the wrist strap type infrared pulse measurement method can be worn at the wrist position and perform real-time active monitoring on a user body state.

The invention belongs to the technical field of arterial blood pressure measurement, and discloses a high-accuracy continuous non-invasive blood pressure measuring device with the self-adaptation calibration function. A photoelectric sensor is adopted for detecting pulse waves, reverse bias voltage is provided for a light receiving tube, the sensitivity and stability of the light receiving tube are enhanced, quite weak pulse wave signals can be detected, and the waveform quality of the detected signals can be improved; a broadband filter is adopted, and it is ensured that pulse wave shapes are distortionless; due to the technologies, correcting variables can be correctly extracted from pulse waves. The device recognizes propagation time PTT related to systolic pressure and diastolic pressure from pulse waves, and extracts various variables according to pulse wave form changes to recognize various anomalous changes of self-adaptation correction PTT in real time; on the basis of an existing mathematic model, blood pressure can be measured in a high-accuracy, continuous and noninvasive mode under the complex clinic condition, and calibration and repeated standardization can be achieved not depending on conventional methods such as cuff oscillography.

The invention discloses a pulse welding method, wherein the welding current waveform is cycled an repeated in periodicity. A unit period waveform is composed of a Gaussian wave strong pulse set and a rectangular wave weak pulse set, wherein a Gaussian function modulation mode of the Gaussian wave strong pulse set is divided into a Gaussian wave pulse peak value modulation and Gaussian wave pulse basic value modulation. In the unit period waveform, the time of basic value currents of the Gaussian wave strong pulse is equal, and the time of all peak value currents of the Gaussian wave pulse is equal. During the Gaussian wave pulse peak value modulation, magnitude and duration time of the basic value currents of the Gaussian wave pulse in the unit period waveform are equal, the magnitude of the peak currents is modulated according to a Gaussian function, and the time of the peak value currents is equal. During the Gaussian wave pulse basic value modulation, magnitude and duration time of the peak value currents of the Gaussian wave pulse in the unit period waveform are equal, the magnitude of the basic currents is modulated according to a Gaussian function, and the time of the basic value currents is equal. The welding method is capable of concentrating energy, good in controllability, and particularly suitable for welding sheet aluminum alloy.

The invention relates to a wave filtering method, which solves the problem of noise filtration when a pulse echo signal is intervened by noise from the view of signal processing. The method comprises the following steps: acquiring a transmitted pulse signal, and obtaining a frequency spectrum of the transmitted pulse signal through Fourier transformation; performing waveform analysis on the frequency spectrum of the transmitted pulse signal, and determining a geometrical structure of the waveform of the frequency spectrum; determining effective bandwidth of the frequency spectrum of the transmitted pulse signal; determining central frequency of the frequency spectrum of the transmitted pulse signal; designing a wave filter; acquiring an actually-measured pulse echo signal, and obtaining a frequency spectrum of the actually-measured pulse echo signal by Fourier transformation; multiplying the frequency spectrum of the actually-measured pulse echo signal by a frequency response function of the wave filter in a frequency domain to obtain a frequency spectrum of a detection echo signal after wave filtration; and performing Fourier transformation on the frequency spectrum of the echo signal in the step, and multiplying the transformed frequency spectrum of the echo signal by a shifted factor to obtain a filtered detection echo signal. The method is particularly applicable to detecting a weak pulse echo signal.

The invention relates to a traditional Chinese medicine composition, particularly a Chinese patent medicine for treating chronic gastritis and gastroduodenal ulcer and a preparation method thereof. The traditional Chinese medicine is prepared from the following components in parts by weight: 50-200 parts of Mangnolia officinalis, 150-300 parts of costus root, 50-200 parts of cuttlebone, 50-150 parts of amomum fruit, 50-150 parts of corydalis tuber, 50-150 parts of dried ginger, 100-200 parts of hyacinth bletilla, 50-150 parts of Chinese date and 60-130 parts of licorice root. The Chinese patent medicine for treating chronic gastritis and gastroduodenal ulcer has the functions of regulating the flow of qi, warming the middle-jiao and alleviating pain. The Chinese patent medicine for treating chronic gastritis and gastroduodenal ulcer is mainly used for treating stomach cold and qi stagnation of epigastralgia, including swelling, pain, anorexia, acid regurgitation, irregular excretion, light texture of tongue, thin and white tongue coat, and weak pulses.

The invention discloses medicinal and edible granules for preventing and treating senile dementia. The granules are characterized by being prepared from the following components in parts by weight: 2.5-4 parts of ginseng, 2.5-4 parts of Chinese wolfberry fruits, 2.5-4 parts of alpinia oxyphylla, 1.5-2.5 parts of polygonatum kingianum, 0.2-0.8 part of maca, 0.05-0.2 part of Chinese dates and 0.05-0.2 part of licorice roots. The granules have the effects of tonifying kidneys, invigorating brain, tonifying middle-Jiao and Qi, nourishing blood and tranquilizing, are used for preventing and treating light-moderate senile dementia (Alzheimer diseases) which has symptoms of amnesia, palpitation, energy lack, apathia, dizziness, fatigue, insomnia, light tongue nature, weak pulse and the like.