42 results about "Maximal amplitude" patented technology

An emergency system for treatment of a patient (20) experiencing an acute vascular obstruction, employing a non-invasive vibrator (10), optimally in conjunction with drugs, for disrupting and lysing thromboses, relieving spasm (if associated), and thereby restoring blood perfusion. Vibrator (10) is operable in the sonic to infrasonic range, with a source output of up to 15 mm. For acute myocardial infarction cases, a pair of contacts (12), are advantageously placed to bridge the sternum at the fourth intercostal space. Vibration is initiated at 50 Hz (or any frequency, preferably within the 20-120 Hz range), and is ideally adjusted to a maximal amplitude (or force) deemed tolerable and safe to the patient (20), preferably with the administration of thrombolytic agents or other form of drug therapy. A synergistic effect is achieved between vibration and drugs to facilitate the disruption of thromboses, relieve spasm, and restore blood perfusion. In a variation, ultrasonic imaging may be used to direct vibration therapy.

The invention discloses an abnormal vibration analysis-based GIS (gas insulated switchgear) mechanical fault diagnosis method and system. The GIS (gas insulated switchgear) mechanical fault diagnosis method includes the following steps that: vibration signals on a GIS are acquired; de-noising processing is performed on the acquired signals through using a threshold de-noising method; various kinds of feature information contained in the signals are extracted by using a narrowband noise aided multivariate empirical mode decomposition (EMD) method; the power feature of the signals is extracted by using a power density function, and the maximal amplitudes of the power spectra of all IMF of each channel are calculated so as to form power feature matrixes under measured conditions; and a power feature matrix under a normal condition and/or power feature matrixes under various kinds of fault conditions which are obtained through tests are adopted as judgment criteria of faults. Compared with a traditional method, the method and system of the invention have no influence on the normal operation of a whole power system, and can monitor the running state of the GIS safely and reliably, and are suitable for being applied to GIS substations of various voltage levels.

The invention relates to a self-adaptive partial-discharge monitoring method and device for a sampling frequency. The method comprises the following steps: (1), detecting a UHF (Ultra High Frequency) signal; (2), achieving low-frequency sampling of the detected UHF signal, and meanwhile, judging whether a maximal amplitude value of the detected discharge voltage is continuously greater than a set threshold value, if no, proceeding low-frequency sampling, and if yes, carrying out high-frequency sampling, wherein low-frequency sampling information of at least 50 former continuous periods is saved while the high-frequency sampling is started; and (3), allowing the duration of the high-frequency sampling to be longer than a power frequency period, saving the high-frequency sampling information and terminating the sampling. The sampling method provided by the invention improves the precision of a monitoring system, the fault type correct identification rate and the economical efficiency.

The invention relates to a method for on line identifying and dynamically inhibiting the resonance of an electromechanical servo system, relating to the field of electromechanical servo systems and aiming at solving the problems that the existing electromechanical servo system is poor in reliability caused by being damaged by mechanical resonance and wastes manpower and material resources in a maintaining process. The method comprises the steps of analyzing a signal spectrum output from a controller of the electromechanical servo system to obtain N spectrum values; comparing an obtained maximal amplitude value Hmax with a set threshold value Hth, inhibiting by adopting a notch filter method if the Hmax is more than the threshold value Hth and resonance frequency is 1.5 times higher than cross-over frequency till a resonance amplitude value is attenuated to be less than the threshold value Hth, and meanwhile, detecting the change of a phase angle at shearing frequency; if the resonance frequency is 1.5 times lower than the shearing frequency or the loss of the phase angle at the shearing frequency regulated by using a notch link is already more than 10 degrees, gradually transferring the shearing frequency forwards at the step size of h rad/s, and identifying a signal output from the controller of the electromechanical servo system again so as to inhibit the resonance. The method disclosed by the invention can be used for the electromechanical servo system.

The invention discloses an engine transient periodic torque simulating method of an automobile transmission stand knocking test. The method comprises the following steps that 1) a throttle opening degree-rotating speed-torque model of an engine is established; 2) an inertia toque resolving module is established, an inertia torque TI is obtained, and a maximal amplitude A1 of the inertia torque is obtained; 3) an indicator diagram is drawn, and a maximal amplitude A2 of a combustion torque is obtained; and 4) a mean torque TM, the maximal amplitude A1 of the inertia torque and the maximal amplitude A2 of the combustion torque are fit, the number of cylinders in the simulated engine and the advance angle of igniting are considered, and a torsional oscillation curve of the engine is obtained, namely the total transient torque of the engine is obtained. The simulating method of the invention is high in accuracy and instantaneity and lower in computational complexity, and can satisfy high dynamic control response during transient periodic torque (torsional oscillation) simulation of the engine.

A methods is provided for reliable and accurate detection of opening or closing of doors or drawers using output signals generated by a sensor, the output signals directly or indirectly representative of the acceleration of the sensor over time. Areas under a curve for acceleration, or representations thereof, are determined and occurrence of movement events identified through comparison of calculated areas with certain thresholds. Areas are considered which span between zero crossing points of the acceleration curve, such that all elements of the corresponding sum are of the same sign, and consequent area signals have maximal amplitude. Pairs of substantially equal and opposite area signals may be sought, occurring within a given time separation, these characteristic of an opening or closing motion, consisting of a first acceleration in a first direction followed by a second in an opposing direction. Apparatus for the reliable detection of opening or closing events is also provided.

The invention discloses a combined learning method for foreground region marking and depth order inferring, including the following steps: conducting image segmentation, building image models for the segmented images, building a combined framework based on the predictions of a variety of three tuples, and carrying out training with maximal amplitude on the basis of a structured support vector machine so as to obtain the deep order relationship of each region in the images and the foreground and background markings; The invention makes modifications and improvements to the limitations and deficiencies from one signal predication by deeply estimating monocular images and reviewing and summarizing the foreground region markings, puts forward an estimated combination of framework and makes effective and correct use of some graph verification code algorithms from Geometric Context data set and Cornell Depth Order data set. And a more effective prediction result can be achieved through the method.

The invention provides a method for judging the floating and sinking degree of a pulse condition. The method comprises the following steps of: applying a plurality of pulse taking pressures within a pressure interval on a pulse taking position, wherein the pressure interval is [0, Pmax]; acquiring a pulse signal reflecting the pulse condition within a preset time span when each pulse taking pressure is applied, wherein the preset time span is set in such a way that the acquired pulse signal at least comprises one pulse period; determining the pulse taking pressure Popt corresponding to the pulse period with the maximal amplitude among the acquired pulse signals; and judging the floating and sinking degree of the pulse condition based on the position of the Popt in the pressure interval, wherein the Pmax is the pulse taking pressure which makes the amplitude of the acquired pulse signal be zero approximately through pressure application, and the pressure difference among a plurality of pulse taking pressures is set in such a way that the pulse period with the maximal amplitude can be acquired. In addition, the invention further provides corresponding equipment for judging the floating and sinking degree of the pulse condition.

The invention discloses a method and a device for acquiring the location information of gamma photons in PET equipment, which is used for accurately acquiring the location information of gamma photons. The method comprises the steps of receiving four paths of PMT signals Ea, Eb, Ec and Ed acquired by a detector module; superposing the signals to acquire superposed signals Eab, Ecd, Eac, Ebd and E; selecting one path of superposed signals from Eab and Ecd, and from Eac and Ebd respectively, according to the selecting condition that the maximal amplitude of the superposed signals is larger than or equal to a first amplitude; marking the sampling time for the selected superposed signals and the rising edge of E when passing through the sampling points of a second amplitude and a third amplitude, sampling the selected superposed signals and the falling edge of E, fitting the waveform of the selected superposed signals and the waveform of E; and acquiring the location information of gamma photons according to the sampled waveform of the selected superposed signals and the sampled waveform of E.

The invention discloses an electroencephalogram relaxing degree identifying method and an electroencephalogram relaxing degree identifying device based on multi-space signal characteristics. The electroencephalogram relaxing degree identifying method comprises the following steps: extracting signal waves from electroencephalogram sequence signals to be processed; acquiring the sampling point number of the signal waves and the points with the amplitudes being smaller than the amplitude threshold value in each second and with the maximal amplitude absolute values, calculating the average value of the amplitudes, calculating the probability density of the amplitude according to the sampling point number and the average value of the amplitudes, thus obtaining the characteristic quantity in the time domain space; calculating the phase space distribution density of the signal waves, thus obtaining the characteristic quantity in the phase space; calculating the energy of the signal waves, calculating the center frequency of each signal wave according to the energy and the frequency range of each brain wave, thus obtaining the characteristic quantity in the frequency domain space; and carrying out classified identification according to the characteristic quantity in the time domain space, the characteristic quantity in the phase space and the characteristic quantity in the frequency domain space, thus obtaining the electroencephalogram relaxing degree. With the method and the device, the characteristics in different spaces of the each brain wave can be comprehensively extracted, and thus the accurate identification for the electroencephalogram relaxing degree can be realized.

The invention discloses a neutral-point voltage balance control method and system for an electroless capacitor NPC (Neutral Point Clamped) three-level inverter. The neutral-point voltage balance control method is based on a carrier comparison PWM modulation strategy, that is, a CB-PWM modulation strategy, and includes the steps: calculating a three-phase modulated wave according to a voltage vector, and obtaining a modulated wave Vmax having the maximal amplitude and a modulated wave Vmin having the minimum amplitude at the same time; detecting the voltage of the upper and lower capacitors bya voltage detecting circuit, and calculating the voltage difference; determining whether the motor is running in the electric or braking state; and according to the two conditions, determining that the Vmax and the Vmin are clamped to P or N of the bus voltage, reselecting the redundant vector, and modifying the switching sequence of the IGBT to ensure voltage balance. The neutral-point voltage balance control method and system for an electroless capacitor NPC three-level inverter have the advantages of being low in the switching loss, being less in the time of achieving simple CPU calculation, being able to control the fluctuation of the neutral point voltage in a reasonable range, and being high in the adjusting speed.

The invention discloses a self-adaptation noise reduction method. The self-adaptation noise reduction method comprises the steps of acquiring noise signals of a motor; carrying out sound pressure spectrum analysis on the noise signals so as to obtain two harmonic waves with maximal amplitude values; carrying out harmonic wave calculation on the two harmonic waves with the maximal amplitude values of the noise signals, and outputting a direct-axis harmonic wave voltage component and a quadrature-axis harmonic wave voltage component of the motor; acquiring a direct-axis voltage component and a quadrature-axis voltage component of the motor; and adding the direct-axis harmonic wave voltage component and a quadrature-axis harmonic wave voltage component of the motor with the direct-axis voltage component and the quadrature-axis voltage component of the motor, then carrying out Parker inverse transformation, outputting the required phase voltage component of the motor, and carrying out self-adaptation inhibition on the noise generated by the motor in real time. The invention also discloses the self-adaptation noise reduction system of the motor.

The present invention provides a fractional order PI speed controlling method of a permanent magnet synchronous motor. The method enables a speed control system of the permanent magnet synchronous motor to get the maximal amplitude margin under the given phase margin and amplitude cross-over frequency, and realizes the control parameter integrated decision of the proportional gain, integral grain, and integration order for a transfer function of the designed fractional order PI speed controller. The fractional order PI speed controlling method of the permanent magnet synchronous motor can enable the system to get the maximal amplitude margin under the given phase margin and amplitude cross-over frequency so that the system gets larger stable reserve, thereby reducing the overshoot responded to the motor speed.

The invention discloses an imaging modification method for strengthening the performance of a piezoelectric film sensor. A simple chemical deposition method is used for carrying out nano-scale thickness self-assembly imaging modification on an acoustic wave propagation crest (trough), so that imaging configuration of biomolecules on the same plane material is achieved on the surface of a sensor, and the capture size of molecules in unit area of a sensitive area of the sensor is improved. Meanwhile, hydrophobization modification is carried out in a non-crest (trough) area to weaken non-specific adsorption of other molecules in a sample, so that molecules are promoted to be configured at the maximal amplitude position of the sensor in a concentrated imaging manner, the mass addition is concentrated in the crest (trough) area, mass addition in unit area is increased, the sensitivity of the piezoelectric film is strengthened, and further the performance of the piezoelectric film sensor is strengthened, the quantitative detection of biological molecules in a complex sample can be realized and a key technology is provided for establishing an high-sensitivity, multi-channel and high-flux automatic biological molecule quantitative detecting method.

The invention discloses a control circuit for reducing DC gain of an internal module of a computer. The control circuit comprises a diode D1, a capacitor C1, a resistor R1, an operational amplifier U1, a capacitor C2 and a resistor R2, wherein one end of the capacitor C2 is respectively connected to one end of alternating current Ui, a resistor R5 and a cathode of the diode D2 and the other end of the capacitor C2 is respectively connected to the resistor R2, an anode of the diode D2 and a non-inverting terminal of the operational amplifier U1; an inverting terminal of the operational amplifier U1 is respectively connected to the resistor R1 and a resistor R3; and the other end of the resistor R1 is connected to the capacitor C1. The control circuit adopts design of the single operational amplifier U1 and introduces DC complete feedback and AC partial feedback, when the AC voltage gain is larger, the DC voltage gain is very small, so that the saturation of the operational amplifier due to input offset current is avoided, and furthermore, the voltage stabilizing diode D1 is arranged to clamp the maximal amplitude of the voltage at the output end in order to suppress the DC offset.

The invention provides a laminated film, a manufacturing method of laminated film, a manufacturing method of polarized laminated film, and a manufacturing method of a polaroid. For the laminated film, a resin layer made of polyethylene alcohol resin is formed on a substrate membrane. The laminated film will not generate uneven optical strips when being assembled to a polaroid. The laminated film is prepared by forming a resin layer made of polyethylene alcohol resin on a long strip liked substrate membrane. The maximal amplitude of width of the resin layer in the width direction is 2.0 [mu]m or less.

An excitation voltage biases an ionic conducting material sample over a nanoscale grid. The bias sweeps a modulated voltage with increasing maximal amplitudes. A current response is measured at grid locations. Current response reversal curves are mapped over maximal amplitudes of the bias cycles. Reversal curves are averaged over the grid for each bias cycle and mapped over maximal bias amplitudes for each bias cycle. Average reversal curve areas are mapped over maximal amplitudes of the bias cycles. Thresholds are determined for onset and ending of electrochemical activity. A predetermined number of bias sweeps may vary in frequency where each sweep has a constant number of cycles and reversal response curves may indicate ionic diffusion kinetics.