84 results about "Decay curve" patented technology

A time-resolved photoluminescence technique is disclosed to image photovoltaic cells and wafers. The effective lifetime is measured directly using a photodetector that has a fast response. A pulsed light source flashes the wafer, generating excess carriers in the silicon. The rate of carrier recombination is monitored by imaging the photoluminescence decay over time. An effective lifetime can be extracted from the photoluminescence decay curve, which can be used to determine the quality of the photovoltaic cells and wafers.

A method is described for measuring the capacitance and the equivalent oxide thickness of an ultra thin dielectric layer on a silicon substrate in which the dielectric layer is uniform or patterned. The surface of a dielectric layer is electrically charged by a flux on ions from a corona discharge source until a steady state is reached when the corona flux is balanced by the leakage current across a dielectric. The flux is abruptly terminated and the surface potential of a dielectric is measured versus time. The steady state value of the surface potential is obtained by extrapolation of the potential decay curve to the initial moment of ceasing the corona flux. The thickness of a dielectric layer is determined by using the steady state potential or by using the value of the surface potential after a predetermined time.

The invention discloses a power battery life prediction method. The power battery life prediction method comprises the following steps: determining battery capacity fading stages according to battery cell life decay rate; establishing a capacity fading model for capacity retention rate with chemical reaction rate and time; obtaining a cycle life decay module and a calendar life decay module in combination with the battery capacity fading stages; training the cycle life decay module and the calendar life decay module on the basis of battery cell test data and determining parameters in the models; generating a cycle life decay curve and a calendar life decay curve according to the cycle life decay module and the calendar life decay module; superposing the two curves in a predetermined ratio to obtain a battery life prediction curve. On the basis of Arrhenius equation an internal resistance increase principle, multiple variables are provided for comprehensive consideration, and the battery life prediction curve bettering meeting the actual use conditions of a battery is obtained, so that larger prediction errors are effectively avoided, and the accuracy of a prediction model is improved substantially.

A mechanism is provided that aggregates data in a way that permits data to be deleted efficiently, while minimizing the overhead necessary to support bulk deletion of data. A request is received for automatic deletion of segments in a container and a waterline is determined for the container. A determination is made if at least one segment in the container falls below the waterline. Finally, in response to one segment falling below the waterline, the segment from the container is deleted. Each object has an associated creation time, initial retention value, and retention decay curve (also known as a retention curve). At any point, based on these values and the current time, the object's current retention value may be computed. The container system continually maintains a time-varying waterline: at any point, objects with a retention value below the waterline may be deleted.

The invention provides a transient fluorescence lifetime measurement method based on single photon counting, which includes the following steps that: 1) a sample is irradiated by pulse light with high recurrence frequency to excite fluorescence; 2) the fluorescence lifetime of the sample is induced to have transient changes according to a certain period; 3) the fluorescence photons of the sample are detected and the corresponding high-speed digital pulse signals which represent the single photon signals are outputted; 4) the macro times of the photons are divided into different time zones, the photons are allocated to different groups according to the macro time and the groups correspond to the time zones of the macro time of the photons; and 5) time-relevant single photon counting is conducted on the photons in each macro time zone according to the high-speed digital pulse signals so as to get a fluorescence decay curve of the fluorescence photons in the macro time zone relative to time. In such way, the fluorescence decay curves in different macro time zones can be obtained. The invention further provides a corresponding transient fluorescence lifetime measurement system. The transient fluorescence lifetime measurement method and system are capable of recording the transient fluorescence decay dynamic curves of the nanosecond time sequence.

The invention discloses a distributed online regulating method for splicing multiple projectors. The distributed online regulating method is based on the prior geometric correction and the color difference correction, takes a curve family (x, x, x ... x) as a substrate, utilizes a control point real-time fitting integration curve to approach an actual decay curve, adopts the way of real-time collection of an image of an integration band by a video camera to analyze brightness information of the integration band, draws an integration brightness change curve to be used as a regulation reference, continuously adjusts the coordinates and the number of adjusting points and the order of the fitting curve, further changes the integration curve and changes the integration effect in an online manner. The method abandons the integration curve with the fixed form, adopts the online regulation way of generating the integration curve by point real-time fitting and has obvious universality and rapidness, high regulation efficiency and good actual application effect.

A light-emitting element of the present invention can have sufficiently high emission efficiency with a structure including a host material being able to remain chemically stable even if a phosphorescent compound having higher emission energy is used as a guest material. The relation between the relative emission intensity and the emission time of light emission obtained from the host material and the guest material contained in a light-emitting layer is represented by a multicomponent decay curve. The relative emission intensity of the slowest component of the multicomponent decay curve becomes 1/100 for a short time within a range where the slowest component is not interfered with by quenching of the host material (the emission time of the slowest component is preferably less than or equal to 15 μsec); thus, sufficiently high emission efficiency can be obtained.

An anemometer and method for analyzing fluid flow is described. In one embodiment, a transistor sensor is heated by applying power to cause its base-emitter junction to rise from an ambient first temperature to a second temperature. The power is removed, and the Vbe is measured at intervals as the junction cools. The Vbe equates to a temperature of the junction. The temperature exponentially decreases, and the time constant of the decay corresponds to the fluid flow velocity. A best fit curve analysis is performed on the temperature decay curve, and the time constant of the exponential decay is derived by a data processor. A transfer function correlates the time constant to the fluid flow velocity. The transistor is thermally coupled to a metal rod heat sink extending from the package, and the characteristics of the rod are controlled to adjust the performance of the anemometer.

The invention discloses a method for measuring the integral light decay property of an LED (light emitting diode) lamp. The method comprises the following steps: firstly, selecting an LED lamp bead in the LED lamp as a to-be-tested device, secondly, putting the LED lamp into an incubator, disconnecting a circuit line between a driving power output and an LED array, connecting an ammeter in the circuit in series, and connecting a voltmeter to two sides of the to-be-tested device, thirdly, stabilizing the testing temperature in the incubator, taking the testing temperature as initial temperature T1, fourthly, turning on the LED lamp, and recording working voltage V1 and series current I1, fifthly, recording working voltage V2 and series current I2 at a stable thermal equilibrium state, sixthly, obtaining forward voltage difference Delta Vf, which is equal to V2 minus V1, seventhly, obtaining junction temperature difference Delta t, which is equal to Delta Vf/K, eighthly, obtaining junction temperature value T2, which is equal to T1 plus Delta t, and ninthly, looking up the light decay curve of an LED device, taking a cross axis reading in a position where a corresponding T2 decline curve and 70 percent of a normal axis are intersected as the service life of LED and also as the service life of the LED lamp at 70 percent of light decay.

The invention belongs to the field of building materials, and particularly relates to a method for rapidly and continuously representing cement hydration degrees by means of a low-field nuclear magnetic resonance technology. The method comprises the following steps that 1, slurry is prepared, weighing is conducted, the water content m<0> and the cement content m<c> in the cement slurry are calculated, the slurry is rapidly put in a low-field nuclear magnetic resonance instrument, and test is conducted after system parameters and sampling interval time are set; 2, a CPMG impulse sequence is adopted to collect nuclear magnetic resonance transverse relaxation decay signals at t moments in different hydration time; 3, first echo peak amplitudes I(t) of a decay curve at the t moments in the different hydration time are automatically collected, and an amplitude I<0> of a first collection point is recorded; 4, physical combined water amounts m(t) at the hydration t moments are determined through the specific value of the I(t) to the I<0>, and hydration degrees alpha(t) at the hydration t moments are obtained according to the formula in the specification; 5, a relation curve of the alpha(t) and t is drawn, and the hydration degrees at any hydration t moment can be read. According to the method for rapidly and continuously representing the cement hydration degrees by means of the low-field nuclear magnetic resonance technology, drying or stopping of hydration to samples is not needed, and in-situ detection and continuous monitoring to the cement hydration degrees can be achieved.

A system and method for processing highly undersampled multi-echo spin-echo data by linearizing the slice-resolved extended phase graph model generates highly accurate T₂ maps with indirect echo compensation. Principal components are used to linearize the signal model to estimate the T₂ decay curves which can be fitted to the slice-resolved model for T2 estimation. In another example of image processing for highly undersampled data, a joint bi-exponential fitting process can compensate for image variations within a voxel and thus provide partial voxel compensation to produce more accurate T₂ maps.

Detection probes and a method of detection for the detection of a specimen having a specified sequence in a sample are disclosed that utilize two fluorophore-labeled (donor and acceptor) probes which are designed to display changes in a fluorescence decay curve by their hybridization to the specific sequence of a specimen, thus allowing for the detection with great accuracy and high sensitivity, particularly under the conditions where the probes may be abundant relative to the specimen in the sample.

The invention provides a background noise energy eliminating measurement method of a reverberation time of a factory building. The method comprises the following steps of arranging a microphone in the factory building, giving out pulse response excitation through a sound source, and collecting a reverberation sound signal by using the microphone; selecting octave center frequency; filtering a frequency range corresponding to the collected signal, so as to obtain a sound pressure signal under the center frequency; choosing one segment of long enough background noise signals at a later-period stable stage to carry out energy integration, so as to obtain a noise energy average value per a unit time; choosing a long enough signal at a reverberation decay-period stage, so as to obtain an attenuation-period sound energy value after background noise energy is eliminated; linearly fitting a sound pressure level decay curve, so as to obtain a fitted gradient, and calculating the reverberation time through the gradient. By using the method, the influence of background interference noise on the measurement of the reverberation time can be removed; the method is applied to a factory building in which the background interference noise exits; the reverberation time of the factory building is measured.

The embodiment of the invention discloses a method for determining aperture opening ratio of an OLED display panel, which not only considers the maximum value of the aperture opening ratio preset by the display panel, the minimum value of the aperture opening ratio of a preset sub-pixel, and the luminance of a first light emitting unit, a second light emitting unit and a third light emitting unitbut also considers the difference of luminance decay speeds of the first light emitting unit, the second light emitting unit and the third light emitting unit at different times of application, thereby obtaining a first luminance decay curve by adjusting the luminance decay speeds of the first light emitting unit, the second light emitting unit and the third light emitting unit in advance and setting the aperture opening rate of each sub-pixel in the display panel based on the first luminance decay curve obtained after the adjustment so as to reduce the luminance difference of the first lightemitting unit, the second light emitting unit and the third light emitting unit in the process of application of the display panel, relieve the color shift phenomenon of the display panel in the process of application, and prolong the service life of the display panel.

The invention discloses a method for determination of gelation time by a low field nuclear magnetic resonance technology. The method comprises the steps of: employing a Carr-Purcell-Meiboom-Gill (CPMG) sequence to determine a nuclear magnetic resonance decay curve of hydrogel heated for different time at a specific temperature, and conducting fitting by a multi-exponent equation to obtain a T2 distribution curve; calculating the weighted average values of gel internal water corresponded T2 distribution peaks at each time point, and drawing a curve of the T2 value changing along with time; and using a bilinear regression model to fit the T2-t curve, determining the solution-gel transition point of the system, and acquiring the gelation time. The invention provides a new method for simple, rapid and nondestructive determination of gelation time.

Provided is a method for LED aging accelerating. Electron beam irradiation equipment is used for carrying out irradiation on an LED chip, irradiation energy, dose and time are adjusted, and aging accelerating is carried out on an LED. The method comprises the steps that first, the LED chip is subjected to electron beam irradiation, a particle accelerator and a series of matched beam transmission devices are used for irradiation, the speed of a conveying belt and irradiation time are adjusted, and the irradiation dose is adjusted; then, the LED chip obtained after irradiation works under certain working current, and lighting effect testing is carried out with an integrating sphere at intervals; then, an LED light effect decay curve obtained after electron beam irradiation is subjected to fitting, and a corresponding function curve is obtained; and finally an electron beam irradiation LED aging accelerating light effect decay empirical formula is obtained, and the LED chip is subjected to service life estimation. The invention aims at providing the experimental method for LED aging accelerating, through the electron irradiation method and the obtained empirical formula, the working time for an LED aging test can be saved, and good practical value is achieved in the field of LED chip production and application.

The invention provides a full-automatic testing method and system of unconventional ultralow core permeability. The method comprises the following steps of step1, sampling a core, placing in a core clamp holder, and arranging the peripheral environment and pressure; step2, acquiring an initial parameter of a sample, and carting out automatic testing; and step3, acquiring a decay curve and calculating the permeability.

The invention discloses an online fault diagnosis method and a device for a secondary suspension air spring system. The method comprises the following steps: 1) when the air spring is subjected to a load force, deformation parameters of the air spring are acquired and according to the deformation parameters, a pressure-stiffness model for the air spring is built, wherein the deformation parameters comprise a spring height, an effective bearing area and an inner cavity volume; 2) multiple pressure values of the inner pressure of the air spring are acquired, and the multiple pressure values are inputted to the pressure-stiffness model for acquiring a stiffness decay curve of the air spring; 3) according to the stiffness decay curve, a stiffness threshold of the air spring is set; and 4) second stiffness of the air spring is acquired online, the second stiffness and the stiffness threshold are compared, and if the second stiffness is larger than the stiffness threshold, fault happens to the air spring. Defects that fault judgment is carried out on the air spring on the basis of the traditional visual inspection and experience judgment, and thus accuracy is low can be overcome.

The invention discloses a method for evaluating drought resistance of crop seeds during a crop seed germination period based on stimulated luminescence. The method comprises the following steps of performing water stress on germinating crop seeds for a few days by a hypertonic solution with a certain concentration by adopting a hypertonic solution method, stimulating the germinating seeds by non-saturated light, instantly measuring light emitted after the germinating seeds are stimulated, and analyzing the stimulated luminescence of the germinating seeds under the water stress to evaluate the drought resistance of the germinating seeds during the seed germination period. According to the method for evaluating the drought resistance of the crop seeds during the crop seed germination period based on the stimulated luminescence, a stimulated luminescence decay curve of the germinating seeds is directly measured by performing the water stress on the germinating seeds only without a field experiment, and the drought resistance of the germinating seeds is nondestructively and quickly evaluated by extracting and analyzing luminous parameters; and the method is simple and practical, and has a reliable evaluation effect.

A method of investigating an object using nuclear magnetic resonance (NMR) equipment includes generating a one-dimensional projection of the object for each of a plurality of echoes utilizing echo train signal indications resulting from pulse sequences, and utilizing the plurality of one-dimensional projections, for each of the plurality of echoes, generating NMR image data for at least one location in the object. The NMR image data may be displayed. The displayed data may include a T2 decay curve, a T2 value display, a T2 distribution graph, or petrophysical data for at least one object location.

The invention belongs to the field of rapid food detection and discloses a method for detecting oxidation resistance by utilizing long-wavelength allophycocyanin fluorescence. The method comprises thefollowing steps: with allophycocyanin as a fluorescence indicator, competing free radicals released by AAPH with an antioxidant so as to cause delay of fluorescence decay time of allophycocyanin, with a decay curve without the antioxidant as a blank, calculating an AUC (Area Under the Curve) difference of the two, establishing a standard curve, and performing actual sample detection. The method disclosed by the invention has the advantages that allophycocyanin belongs to a long-wavelength fluorescence indicator, has the excitation wavelength of 653nm and emission wavelength of 668nm and can avoid interference of autofluorescence matters in an actual sample; and allophycocyanin has high pH stability and is non-sensitive to internal and external quenching. According to the advantages, the detection sensitivity is greatly improved.

The present disclosure provides a detection method of transient electromagnetic multi-frequency fusion and application. Multiple sets of transmission frequencies are employed for collection to obtaindifferent induced electromotive forces and experiment data distributed at different time channels, data after various frequencies are fused in a coincidence time domain and the data of the specific time domain of each frequency are combined in chronological sequence to obtain multi-channel time domain data to obtain multi-frequency fused data; the combined data is subjected to partitioning on thetime domain to achieve average time channel distribution and obtain an induced electromotive force decay curve; the junction of the regression fusion data and the data of the specific time domain of multiple frequencies is subjected to smooth processing, and by employing the average time channel distribution, the data after smooth processing is substituted into original data to perform two-dimensional imaging inversion and obtain a resistivity profile.

A particle analyzer, comprising a source of a beam of pulsed optical energy; a detector comprising a number of spectral detection channels to detect optical signals resulting from interactions between the beam and particles in a sample (such as, e.g., fluorescence signals), and to convert the optical signals into respective electrical signals; optical paths from the source to the sample and from the sample to the detector; a flowcell connected with the optical paths and with a flow path for a suspension of particles; a signal processing module capable of: receiving the electrical signals from the detector; mathematically combining individual decay curves in the signals into a decay supercurve; allocating individual components of the supercurve to discrete bins of predetermined time constants; and quantifying the relative contribution of individual components to the supercurve; a particle sorting actuator; an actuator driver; and at least one particle collection receptacle.

A data acquisition device for measuring excited state lifetime based on a frequency counting card and a method for measuring excited state lifetime, the measuring method includes the following steps: exciting the sample to be tested with a high repetition frequency pulsed laser to generate photoluminescence, and detecting the photoluminescence of the sample Light-emitting signal, use the frequency counting card to measure the time interval between the detected photon pulse signal and the excitation light pulse signal, divide the measured photon time difference into various time intervals, and distribute the photons with different time difference data into the corresponding In the time zone; count the photons in each time zone separately to obtain the photoluminescence photon luminous intensity decay curve, and perform exponential decay fitting on the luminous intensity curve to obtain the excited state lifetime of the sample to be tested. Compared with other fluorescence or phosphorescence lifetime measurement methods, the method of the invention can measure a wider range of excited state lifetime data and lower cost; meanwhile, it also has high time resolution and detection sensitivity.

The invention relates to the technical field of geophysical exploration, and in particular to a method for correcting a small wireframe transient electromagnet inductive effect through utilizing decay curve slopes, which is used for correcting an inductive effect which is generated when small wireframe transient electromagnet uses a plurality of turns of small return wires to acquire data and eliminating the influence of the inductive effect in an existing small wireframe transient electromagnet processing process. The method adopts process steps of: (1) starting; (2) carrying out statistics on ground large wireframe secondary field decay curve morphological characteristics; (3) selecting a mutational range of small wireframe transverse electric and magnetic field (TEM) measured data; (4) calculating the corresponding slopes of all the time periods within the range; (5) selecting an initial point; (6) directly assigning new slope values for the time periods behind the initial point; (7) introducing a weight coefficient to inversely deduce the new slope values of the time periods before the initial point; and (8) artificially judging whether a correction effect is satisfied or not according to the slope variance yield (such as less than 0.3) of the curve of all the measured points, if yes, ending up, and if not, returning to the step (3).