288 results about "Attenuation curve" patented technology

The invention relates to a seismic wave absorption and attenuation compensation method, and belongs to the geophysical exploration data processing technology. The method comprises the following steps: selecting one of VSP (vertical seismic profiling) initial data as reference data, carrying out generalized S-transform on the reference data, selecting sampling points as reference points, and recording the time and time-frequency spectrums of the sampling points; carrying out generalized S-transform on data of each sampling point, and dividing the time-frequency spectrum of corresponding frequency in the time-frequency spectrums of the reference points by the time-frequency spectrum of each sampling point so as to obtain an absorption and attenuation curve; determining a natural logarithm to figure out a phase compensation operator according to a formula of frequency difference of absorption and attenuation signals in a time frequency domain; and carrying out absorption and attenuation compensation and phase compensation in the time frequency domain to obtain a fine VSP wave field profile. The method has the advantages that noise can be eliminated during the process of fitting the absorption and attenuation curve; generalized S-inverse transform without energy loss is realized; signal-to-noise ratio and resolution of the data are improved after compensation; log resolution control is realized; the reference points are selected flexibly; and algorithm is simple and efficient.

The invention discloses a combined measurement method for organic matter-rich compact rock core gas permeability and diffusion coefficient. The method utilizes a gas pressure attenuation device to accomplish. The device is composed of a rock core holder, a gas storage chamber, a vacuum pump, a confining pressure pump, and a computer. The rock core holder is connected to the vacuum pump and the confining pressure pump respectively, the inlet end of the rock core is connected to the gas storage chamber and a gas source, the outlet end of the rock core is in a closed state, and the device is located in a water-bath heating system. By monitoring the process of the gas in the gas storage chamber flowing to the rock core till balance, a gas pressure attenuation curve can be obtained, then according to a real gas state equation, material balance and the occurrence and flow mechanism of gas in rock, the attenuation curve is divided into a seepage stage and a diffusion stage, thus acquiring the gas permeability and diffusion coefficient. The method provided by the invention simplifies the testing procedure, improves the experimental analysis efficiency, and can provide data support for experimental evaluation of gas mass-transfer ability in shale, coal rock and other unconventional reservoir rocks, gas well productivity prediction and the like.

The invention relates to a method for realizing oil-gas detection by applying a long-offset distance transient electromagnetic array method. The method comprises the following steps: firstly, carrying out ATEM (analytical transmission electron microscopy) observation on a detection region to acquire data; selecting measuring points without obvious distortion or negative anomaly of electric field components while an induced polarization field is not stripped, utilizing the ATEM data for inversion, and acquiring a high-resolution lamellar specific resistance model in a detection region; then carrying out ATEM forward operation to obtain transient induced electric field or magnetic field attenuation curves of all the measuring points in the detection region; substracting the electric field or magnetic field component attenuation curve acquired during forward operation by the actually observed ATEM electric field or magnetic field component attenuation curve at the same observation time point to obtain a time domain induced polarization spectrum; applying a time domain induced polarization method for inversion to obtain the polarizability of an underground medium; and carrying out detection and evaluation on an oil-gas reservoir by utilizing the specific resistance and polarizability parameters. According to the invention, the accuracy and reliability of exploration on the oil-gasreservoir by utilizing an electromagnetic method are greatly enhanced, the working efficiency is improved, and the exploration cost is lowered.

The invention discloses a method for digital compensation correction of OLED luminous efficiency attenuation. The method is used for solving the technical problem of complexity in achieving an existing OLED luminous attenuation compensation method. The technical scheme is that luminous efficiency attenuation curves of red, green and blue three-primary-color organic light-emitting materials are respectively subject to fitting and mathematical modeling, and an external system mainframe writes recorded OLED panel working time parameters in a register of an OLED driving chip according to determined time intervals. The OLED driving chip performs sampling and quantization on the luminous efficiency attenuation curves of the red, green and blue three-primary-color organic light-emitting materials at specific time points, and finally independent compensation is performed on digital gamma-curves of the red, green and blue three-primary-color organic light-emitting materials. Compared with the prior art, according to the method, no modification needs to be performed on an OLED panel, work can be performed by utilizing a timer of the external system mainframe, and the method is simple to achieve.

The invention discloses a retired power battery life prediction method. The method is used for predicting the service life of screened same-type retired power batteries with the same state parameters.In the charging and discharging process of the power battery, the temperature T, the discharge rate C and the discharge depth DOD influence the capacity decline of the power battery, a power batterylife attenuation curve is obtained by establishing a charging and discharging characteristic curve of the power battery and a power battery life model; a three-dimensional relation graph of the cyclelife about the capacity loss rate and the function relation is established by using the life attenuation curve, and the three-dimensional relation graph is applied to the same type of batteries, so that the performance attenuation condition of the batteries in the whole life cycle can be predicted. According to the method, the service life of the retired power battery can be quickly predicted through a small amount of calculation, and the working efficiency of an enterprise is greatly improved.

The invention provides a device and a method for measuring deep dielectric charging characteristic parameter of a spacecraft dielectric material. The device comprises a radiation source, a vacuum unit, a sample target table, a control unit, an electrostatic potentiometer, an electrometer, a total conductivity acquisition unit, a potential attenuation measurement unit, a first processing unit and a second processing unit, wherein the electrostatic potentiometer is used for measuring the surface potential of a sample medium under certain flux; the electrometer is used for measuring the leakage current of the sample under certain flux; the total conductivity acquisition unit is used for acquiring the total conductivity based on the measured surface potential and the leakage current; the first processing unit is used for obtaining dark conductivity values under all fluxes based on the obtained potential attenuation curve along with the passage of time and a charge storage attenuation method, and taking an average to obtain the dark conductivity Sigma O; the second processing unit is used for obtaining radiation induction conductivity corresponding to the dosage rate generated in material volume under two different kinds of beam intensity based on the obtained dark conductivity and the total conductivity, so as to obtain the related parameters Kp and the dimensionless exponent delta value of the sample material.

The invention discloses a method and a device for assessing service conditions of batteries. The device for assessing the service conditions of the batteries comprises a mode recognizing unit and a service condition assessing unit. The mode recognizing unit is configured in such a manner that service modes of the batteries in a certain time period and attenuation curves corresponding to the service modes can be recognized according to recorded data relevant to service of the batteries, stored service modes of the batteries and stored attenuation curves corresponding to the various service modes, and the attenuation curves represent variation of the full-charge capacity of the batteries along with the service of the batteries; the service condition assessing unit is configured in such a manner that degradation of the batteries can be computed according to the recorded data, the recognized service modes and the attenuation curves corresponding to the recognized service modes, and degradation of the batteries represents decrease of the full-charge capacity of the batteries along with increase of the service of the batteries. The method and the device have the advantages that the service conditions of the batteries can be accurately assessed, and accordingly residual service value of the batteries during operation can be reasonably judged.

A method of correcting scatter includes obtaining a voxellized representation of a 3D image of an object from a plurality of projection data. A single scatter profile for the object is calculated using the voxellized representation of the 3D image of the object. A total scatter profile for the object is determined using the single scatter profile and an adjustment factor and the projection data is corrected using the total scatter profile to obtain a scatter corrected projection data. A beam hardening correction method includes simulating a number of attenuation data for an x-ray spectrum, at least one object material, and a detector spectral response. A function is fitted to the attenuation data to obtain an attenuation curve. A number of projection data for an object are corrected using the attenuation curve to obtain a number of beam hardening corrected projection data. A corrected image of the object is reconstructed from the beam hardening corrected image data.

The invention relates to a method for obtaining a sonar operating distance index in a practical use environment. The method comprises the steps of calculating acoustic condition parameters such as sea area sound velocity, sea depth and sea bottom, the depth of an objective sound source and the depth of a sonar array by a sound field propagation model, wherein the acoustic condition parameters such as the sea area sound velocity, the sea depth and the sea bottom, the depth of the objective sound source and the depth of the sonar array are described in an original sonar operating distance index condition, obtaining an acoustic propagation attenuation curve TL0 under the original index condition, bringing a sonar operating distance index value R0 into the acoustic propagation attenuation curve TL0, correspondingly obtaining a high-quality factor FOM0 under the index condition, calculating a difference value between a practically measured objective radiation noise lever SL1 and an objective radiation noise level SL0 described in the original index, and a difference value between a practically measured background noise level NL1 and a background noise level NL0 described in the original index, obtaining a sonar high-quality factor FOM1 under a practical use condition, wherein the FOM1 is the sum of FOM0, delta SL and delta NL, bringing the sonar high-quality factor FOM1 into an acoustic propagation attenuation curve TL1 in the practical environment, and correspondingly obtaining a sonar operating distance index value R1 under the practical use condition.

The invention relates to an automatic testing method for key parameters of an MEMS gyroscope structure. The method comprises the following steps: step (1) applying white noise voltage excitation to a driving structure electrode of a driving mode of the MEMS gyroscope so as to generate a driving force; step (2) enabling a vibration collecting structure electrode of the driving mode of the MEMS gyroscope to be connected with a preposition read out circuit, and enabling a response curve to be collected into a digital signal processing machine for FFT treatment so as to obtain resonant frequency fd of the driving mode; step (3) constructing a sine wave according to the resonant frequency fd obtained in the step (2), applying the sine wave to the driving structure electrode of the driving mode, and after determining the gyroscope starts oscillation, collecting an output voltage of the preposition read-out circuit of the driving mode and an output voltage of the preposition read-out circuit of a detection mode so as to obtain a coupling ratio; step (4) removing sine wave excitation, and computing the quality factor Qd of the driving mode through an attenuation curve. According to the automatic testing method disclosed by the invention, the structure key parameters of the resonant frequency, the quality factor, the coupling voltage ratio, the displacement ratio and the like can be automatically tested.

An electrophotographic photosensitive member superior in dot reproducibility and a process cartridge and an process cartridge having the electrophotographic photosensitive member are provided. Where in a light attenuation curve drawn in a way in which the surface of the electrophotographic photosensitive member is so charged that intensity of an electric field is 15 (V/μm) to establish the surface potential of the electrophotographic photosensitive member into a given value E (V) and then exposed to light under conditions that the electrophotographic photosensitive member has a surface potential of 0.8 E (V) at a time point T (ms) passes after exposure starts, the inclination of the light attenuation curve at a time point T (ms) passes after exposure starts is represented by m, and in a dark-time surface potential attenuation curve drawn in a way in which the surface of the electrophotographic photosensitive member is charged under conditions that the electrophotographic photosensitive member has a surface potential of 0.8 E (V) at a time point T (ms) passes after charging is finished and thereafter no exposure is performed, the inclination of the dark-time surface potential attenuation curve at a time point T (ms) passes after charging is finished is represented by m′, the m and m′ satisfy |m−m′|≦0.020, provided that T=[{d²/(μ×E)}×100]×10⁻⁵, where d is the layer thickness (μm) of the charge transport layer and μ is the drift mobility [cm²/(V·s)] of the charge transport layer.

The invention provides a display module display method and a display device display method. A display module includes a display area, and a fingerprint identification area is arranged in the display area. The display method includes that during the fingerprint identification, the display brightness gradually decreases from the center of the fingerprint identification area to the boundary; and during the normal display, the display brightness gradually increases from the center of the fingerprint identification area to the boundary. By means of the display module display method and the display device display method, the service life attenuation curves of the fingerprint identification area and the other display areas tend to be consistent, so that the display effects of the fingerprint identification area and the other display areas tend to be consistent, and the visual effect can be further improved.

The invention discloses an AMOLED white balance adjusting method and system. The method comprises the steps of obtaining a brightness and service life attenuation curve of red-green-blue macromolecule light-emitting materials in an AMOLED, then adjusting the current flowing through a pixel according to the preset adjusting time and the brightness and service life attenuation curve during usage, and maintaining the while balance of the pixel. Due to the fact that the brightness and service life attenuation curve of the AMOLED must be tested before delivery of any product, no extra measurement is needed; during usage, automatic adjustment of the while balance is performed only by judging whether the working time reaches the preset adjusting time, the adjusting time detection is convenient, workloads are small, and implementation is convenient.

The invention discloses a shale permeability testing device based on liquid pressure pulses in the presence of ultrasonic waves. The shale permeability testing device comprises a constant-pressure constant-current pump (1), a vacuum pump (2), a core holding unit (11), an upstream standard room (6) and a downstream standard room (15), wherein the upstream standard room (6) communicates with the liquid inlet end of the core holding unit (11); the downstream standard room (15) communicates with the liquid outlet end of the core holding unit (11); both the upstream standard room (6) and the downstream standard room (15) are connected with pressure sensors (17). The invention further discloses a testing method. The shale permeability testing device and method have the beneficial effects that a rapid shale permeability measuring experiment is realized in the presence of the ultrasonic waves, and a shale permeability changing process is simulated under the action of different ultrasonic wave power; evaluation of the influence degree of the ultrasonic waves on the shale seepage characteristic is realized by observing the difference among pulse attenuation curves generated by making standard saline pass through a shale core to be measured.

The invention provides a method and a device for detecting a viscosity parameter of a viscoelastic medium. The method comprises the steps of applying mechanical vibration with single preset frequency to the viscoelastic medium, and generating shear waves in the viscoelastic medium; transmitting ultrasonic waves to the viscoelastic medium, and receiving ultrasonic echo signals; acquiring displacement or strain data of the shear waves according to the ultrasonic echo signals; calculating oscillation amplitude attenuation metric parameters of the shear waves at different depths according to the displacement or strain data; fitting oscillation amplitude attenuation metric parameters of the shear waves at different depths, acquiring an oscillation amplitude attenuation curve of the shear waves, and determining the viscosity parameter of the viscoelastic medium according to the slope of the oscillation amplitude attenuation curve. According to the invention, low-frequency vibration with the single frequency is only required to be applied to the viscoelastic medium, and the viscosity parameter of the viscoelastic medium is acquired through the mode of acquiring the oscillation amplitude attenuation curve of the shear waves, thereby more sufficiently utilizing acquired data information, and being convenient to operate and high in accuracy.

The invention relates to a method for estimating stratum medium quality factors based on a seismic signal envelope peak. The method comprises the steps that 1) media are divided into a plurality of small sheets with the distance between two adjacent detectors as a thickness; 2) constant phase wavelets are used for approaching direct waves received by the top of the ith small sheet, and seismic wavelet parameters are estimated through a high-order cumulant matching method based on MSMG; 3) the parameters of a wavelet transform kernel function are estimated through the high-order cumulant matching method based on the MSMG; 4) the signal receiving instantaneous frequency of the upper interface and the lower interface of the ith small sheet is calculated; 5) the changes of envelope peak instantaneous frequency in the ith small sheet are calculated; 6) the quality factor Q value of the ith small sheet is calculated; 7) the steps 2)-6) are repeated, the quality factors of the other N-1 small sheets except the ith small sheet are calculated in sequence; 8) the oil-gas possibility of a reservoir stratum is forecast through the quality factor Q values, obtained in the step 6) and the step 7), of thee N small sheets, and then an estimated attenuation curve is obtained.

The invention discloses a shale base block dynamic damage evaluation device and method based on a liquid pressure pulse. The device comprises an upstream standard room, a downstream standard room, a rock core clamping device, a confining pressure pump, a vacuum pump, a constant-pressure and constant-flow pump, a middle container, a pressure sensor, a constant-temperature system and the like; a damage experiment is performed under high-temperature and high-pressure conditions, and a dynamic damage process on a shale base block by working fluid in drilling and completion and cracking processes is simulated; and by monitoring the difference of a pulse attenuation curve of a rock to be detected by standard saline water before and after dynamic damages, the permeability of rock core fluid before and after the dynamic damages is calculated by utilizing a liquid pressure pulse model, so that the evaluation of a dynamic damage degree of the shale base block by the working fluid is realized. The completion of the working fluid damage evaluation method system of the drilling and completion and cracking processes of shale gas can be facilitated, and technical supports are provided for preferring and optimization of a working fluid formula, so that the shale base block dynamic damage evaluation device and method have certain popularization prospects.

The invention discloses a method for simultaneously measuring double-domain induced polarization full parameters. A time domain method is adopted to record and display a potential difference and a curve formed by a cycle repeated signal sent by a power supply electrode between measuring electrodes; synchronization of transmission and receiving of signals are automatically achieved by mathematical treatment; and by calculation, the real part and the imaginary part of a fundamental wave and a harmonic wave are solved according to the obtained synchronized potential difference and curve so as to further calculate apparent resistivity, apparent absolute phase position, apparent amplitude diffusivity and view diffusivity. When the apparent resistivity and the apparent absolute phase position are measured, apparent polarization rate, an apparent charging rate and an attenuation curve are calculated according to a charging curve or a discharging curve at the same time. A time domain (interrupted rectangular wave) power supply mode can be independently adopted and a frequency domain (continuous rectangular wave) power supply mode can also be independently adopted so as to realize the purpose of simultaneously measuring the double-domain induced polarization full parameters in one-time power supply. According to the method, the technical problem of providing more information which can reflect polarization body characteristics and correlated information in short one-time measurement time can be solved.

The invention discloses a residual amplitude compensating method based on an AVO. The method comprises the steps of performing pre-stacking on a CRP gather, calculating parameters, calculating the amplitude of each time window in sliding time windows, calculating time-varying amplitude attenuation curve of signals of (2j+1) ways in the CRP gather, giving a certain way interval increment, judging whether the increment is within the offset distance range or not, if the increment is within the offset distance range, repeatedly executing the step (c), if the increment is not within the offset distance range, executing the next step (e), calculating space-varying amplitude attenuation curves in the different offset distances, obtaining the processed gather amplitude, getting the corresponding incident angle and the corresponding amplitude value of the offset distance, utilizing least square fit for getting coefficients R, W and V, redefining the relation between the offset distance and the amplitude, and compensating and correcting a target way. Excluding fitting is performed on remoulded seismic data, the precise real amplitude effective signals are obtained, and therefore it is ensured that the relation of the pre-stacked data amplitude along with geophone offset changes is obtained, and good foundation is established for subsequent pre-stacking AVO attribute extraction and AVO inversion.

The invention discloses a rock porosity and permeability combined testing device and method under a triaxial condition. The device is used for simultaneously measuring the porosity and permeability ofa rock under a triaxial stress condition, and comprises a pore permeability measuring assembly, a rock core holder (17), a confining pressure loading assembly, an axial pressure loading assembly, a multi-channel data acquisition card (15) and a data storage processing module (16), and the pore permeability measuring assembly, the confining pressure loading assembly and the axial pressure loadingassembly are respectively connected with a rock core holder (17). According to the invention, porosity and permeability tests are completely coupled together. In the gas diffusion process, according to the pressure values of the two ends of the to-be-measured rock and a differential pressure attenuation curve, the porosity and permeability of the rock under a certain triaxial stress are obtained according to the porosity calculation formula and the permeability calculation formula respectively, the correlation between the porosity and permeability of the rock and the correlation between the porosity and permeability of the rock and the stress can be comprehensively analyzed, the test time is shortened to a certain extent, and the test efficiency is improved.