55 results about "Linear formula" patented technology

The invention discloses an online forecasting method and device for the residual life of a fuel cell, and the method comprises the following steps: obtaining the mean cell voltage-time data under a calibration working current through collecting voltage-time data and current-time data when a fuel cell stack is in operation, and obtaining the voltage attenuation rate of the fuel cell stack; predicting the available life of the fuel cell stack through a linear formula if the cutoff mean cell voltage under the calibration working current is greater than a mean cell voltage of a preset separation point under the calibration working current, or else predicting the available life through a nonlinear formula; obtaining the residual life of the fuel cell stack according to the difference between the available life and the consumed life; and displaying the residual life of the fuel cell stack in real time. The method achieves the real-time updating of the attenuation rate of the fuel cell according to the voltage-time data collected in real time, thereby updating the prediction value of the residual life, achieving the online forecasting, improving the accuracy of a prediction result, and improving the prediction real-time performance.

The invention discloses a method for determining the concentration of phosphite by cyclic voltammetry, which comprises the steps of: establishing a working curve by determining the quantitative proportional relation between the oxide peak current intensity of phosphite on a bare Pt electrode and the concentration of phosphite and fitting the working curve as a linear formula, and substituting theoxide peak value of a sample to be detected in the formula to obtain the concentration of phosphite. The method of the invention is accurate in detection results, has the advantages of being simple in experimental conditions, simple and convenient in operation and saving time compared with the traditional methods for determining the concentration of phosphite, such as an oxidation reduction titration method, a paper chromatography, a thin-layer chromatography and an ion exchange chromatography, and has tremendous popularization and application prospect in paint, electroplating and other fields.

An anti-reflection microstructure including: convex portions arranged at a pitch shorter than a wavelength of visible light, each of the convex portions having a conic shape defined by an apex, a lateral surface, and a base, wherein an intersecting line between the lateral surface and a plane which passes through the apex and is perpendicular to the base, is equivalent to a curve expressed by an nth-order linear formula in which 1<n≦3.

The invention provides a digital domain balanced detecting method for an optical fiber gyroscope, which comprises the following steps of: applying a phase modulation signal to a phase modulator, wherein the phase modulation signal is obtained after a sinusoidal signal and a cosine signal which have the same modulation frequency are linearly combined; using the applied sinusoidal signal as an I-path reference signal and carrying out derivation on the I-path reference signal to obtain a Q-path reference signal; respectively carrying out coherent processing on a signal output by the optical fiber gyroscope and the I-path reference signal and the Q-path reference signal so as to obtain an I-path detection signal and a Q-path detection signal; respectively demodulating the I-path and Q-path detection signals to obtain an I-path angular velocity measured value and a Q-path angular velocity measured value; and according to a preset linear formula, combining the I-path and Q-path angular velocity measured values to obtain a measured value of an angular velocity to be measured, wherein the preset linear formula is predetermined according to the linear combination of the applied sinusoidal signal and cosine signal. Due to the utilization of the method, the bias stability of the optical fiber gyroscope can be improved.

In measuring a spectral irradiance distribution of light, light is irradiated to n (natural number) light-transit sections, which respectively have n kinds of given optical characteristic coefficients, and s (natural number) optical sensors, which respectively have s kinds of given spectral sensitivities, receive the light via the n light-transit sections and detects individual responses for the received light. Then a calculating section calculates m (natural number) spectral irradiances for m kinds of wavelengths as a spectral irradiance distribution based on linear formulae established between the optical characteristic coefficients, the spectral sensitivities, (n.times.s) responses for the light obtained by the s optical sensors, and the spectral irradiance distribution of the light.

The invention discloses a preparation method of a fluorescent probe and an oxytetracycline detection method based on the same. The oxytetracycline detection method includes that the fluorescent probe high in water solubility is synthesized by structurally modifying a fluorine-boron fluorescent dye master ring; on the basis that oxytetracycline has good and high-sensitivity fluorescence quenching effect on the probe, a linear formula is built according to changing values of fluorescent strength of the fluorescent probe and concentration of acid oxytetracycline before and after an oxytetracycline standard solution is added; the fluorescent strength of the probe before and after an oxytetracycline sample is added is detected in same conditions, and then content of oxytetracycline in the sample can be calculated according to changing of the fluorescent strength. Related toxic reagents are avoided being used, expensive instruments do not need to be used, detection time is shortened, detection sensitivity and specificity are improved, and the oxytetracycline detection method has good application prospect.

The invention discloses a current meter high-speed linear formula integration detection method and a detection device. The method comprises the following steps: cleaning a ball bearing; detecting average frictional resistance moment M of the ball bearing; detecting a propeller current meter rotating speed V0 and an instrument rotation bearing internal frictional resistance moment M, and confirming that a standard is reached; fixedly installing three detected current meters at the lower end of a measuring rod and placing them into water of a detection water tank; adjusting an axial directions of the current meters; tranquilizing a water body in the tank; starting a motor, a detection vehicle running from a lowest speed and gradually increasing its speed, and detecting instrument output signals and data; and according to a GB/T21699 detection method of rotor type current meter in linear open channel, by use of a least square method, calculating values of a and b of a detection formula and a middle and high-speed whole-line average mean square deviation sigma. According to the invention, the program and steps of a conventional detection method in the prior art are substantially simplified, the precision of detection results of the current meters can be ensured, at the same time, the production efficiency is improved, the working conditions are improved, the management rules are simplified, manpower and material resources are reduced, and the production operation cost is decreased.

The invention relates to a quantitative measurement method based on integral averaging in a pulse infrared heat wave technology. According to the method, a pulse heat source is used for heating reference test pieces made of identical materials; during the reflection type, the heating surface is recorded by a thermal imager, or during the transmission type, the change of the heating back side temperature field is recorded; the original temperature data is subjected to normalization; the processing is performed to obtain an f time sequence; the f sequence is subjected to integral average S value calculation; the corresponding time when the S equals to S<A0> is extracted to be used as the feature time; linear fitting is performed to obtain the slope a and the interception distance b of the feature time and defect depth square relational expression; for the test pieces to be tested, the same experiment scheme, experiment parameters, data processing parameters and the like are used, the feature time t1 is obtained; the defect depth or the test piece thickness is obtained by using the linear formula of the obtained slope a and the interception distance b. The method provided by the invention does not only rely on one point; after interval averaging, the noise influence can be effectively eliminated; the influence by noise is small; the influence by single point randomness is small.

The invention discloses a solid state disk life prediction method, device and apparatus and a readable storage medium. According to the scheme, a medium abrasion index and a timestamp of a solid statedisk within the preset time range are obtained by utilizing physical characteristics that programming and erasing cycle index of the solid state disk is fixed. A prophet model is constructed based on the medium abrasion index and the timestamp so as to predict the service life of the solid state disk. The prophet model can detect the trend change, periodic change and holiday change of the wear degree of the solid state disk. Compared with a simple linear formula, scene adaptability is stronger, so that service life of the solid state disk can be accurately predicted, a user is assisted to know the service condition of the solid state disk, loss caused by damage of the solid state disk is avoided, and safety of data in the solid state disk is remarkably improved.

The invention discloses a method for exquisitely detecting slot wave earthquakes in stress concentration areas of working faces, belongs to the technical field of coal mine geological disaster prediction, and aims at solving the geological disaster prediction problems in high-stress areas of working faces in the prior art. The method comprises the steps of: drawing a stress-wave velocity change overall process curve through longitudinal wave and transverse wave velocity test under a coal and rock mass loading condition, and carrying out a linear formula and a nonlinear formula in stages; calculating crustal stress of a normal area of a working face according to geological data and well field crustal stress distribution features; predicting longitudinal wave and transverse wave velocities of coal and rock mass in the working area of the working face; establishing a three-layer symmetric medium model according to physical property parameters of the coal and rock mass on the working face,and analyzing slot wave theoretical frequency dispersion curve features through numerical calculation; and collecting field acquired transmission slot wave data, carrying out time frequency analysison the transmission slot wave data and drawing an actually measured time frequency curve. The method is capable of better predicting and forecasting coal mine geological disasters.

The invention discloses a computing method for torsional rigidity of a split conductor of an overhead power transmission line. The method comprises the following steps of: firstly, analyzing length change of a sub-conductor due to a torsional movement of the split conductor, and deducing a practical level tension computational formula according to a linear formula of the power transmission line and material property of the conductor when the sub-conductor is torsional; then carrying out a mechanical analysis for a four-split conductor under the action of a torque, in the analysis process, utilizing a characteristic that the split conductor is divided into multiple subspans through a conductor spacer, firstly carrying out a force analysis for the subspans, and finally obtaining a torque balance equation under the action of the torque, and further obtaining a computational formula for the torsional rigidity of the four-split conductor. Finally, summarizing a common computational formula for the torsional rigidity of the split conductor for any split number. In the computing method, the method is adopted to calculate the torsional rigidity of the split conductors with parameters, such as different split numbers and span length and the like, and higher computational accuracy can be achieved, and effectiveness and adaptability of the computing method can be proved.

The invention relates to the field of advanced manufacturing, and specifically relates to a method for predicting milling stability based on a large stability domain 3-order linear formula. The methodis characterized in that a forced vibration period term is fitted through a large-stability-domain third-order linear formula; a state transfer matrix of the milling system is obtained through discretization; and finally, the characteristic value of the transfer matrix of the milling system is judged through Nyquist criteria to predict the milling stability, and a certain theoretical basis and machining parameter guidance are provided for actual production and machining. Compared with other milling stability prediction methods, the method has the characteristics of high calculation efficiency, accurate prediction precision and the like.

The invention discloses a method for measuring indirect enzyme linked immunosorbent assay of red current yiwan alga, which belongs to sea biology technology field. The invention is based on the incrimination of antibody of yiwan alga, at first, the standard sample of yiwan alga and the samples needed to be measured are enclosed by enzyme labeling board, they are sealed with degreased milk powder solution after being hatched in 37deg.C, adds in idiosyncratic red current resisting yiwan alga and serum resisting diluted solution after the board is cleaned, then carries on board cleaning after being hatched in 37deg.C, then adds in enzyme labeling solution, then they are hatched in 37deg.C, adds in enzyme reacting material after the board is cleaned, then the reaction is stopped after the board is cleaned; then uses enzyme labeler to measure the light absorption valve of each aperture on the measuring board, through data conversion, acquires the standard curve of the measured yiwan alga, the linear formula can be acquired with calculation. The invention is quick, convenient, and it overcomes the deficiency in red current yiwan alga measurement.

The invention discloses a proline concentration detection method based on the biosensing technology. The method can achieve accurate detection of the proline concentration in a to-be-detected organ under the condition that the to-be-detected organ of a to-be-detected plant is not damaged. The method comprises the following steps: S1, integrating an electrode, a reference electrode and a working electrode into a microelectrode array; S2, putting the detection end of the electrode on the microelectrode array into the to-be-detected part of the to-be-detected plant, collecting the anodic peak current generated through the electrochemical reaction of proline in the to-be-detected part through using an electrochemical workstation and adopting the cyclic voltammetry, calculating the average value of the current in preset duration after the current change becomes steady, and substituting the average value into a precomputed linear formula of the proline concentration and the average value of the current, so as to obtain the proline concentration of the to-be-detected part.

A liquid density sensor has a sensing module, a sensing rod and a floating device. The sensing module has a control circuit having computing functions. The sensing rod has a sensing line electrically connected to the control circuit. The floating device has a first magnetic unit and a floating ball mounted therein. The sensing rod is mounted through the floating device and the floating ball. The floating ball has a second magnetic unit. A specific gravity of the floating ball is lower than that of the floating device. The control circuit calculates a liquid density of liquid based on a distance between the first magnetic unit and the second magnetic unit according to a linear formula.

The invention discloses a performance sampling verification method for a propeller current meter. According to the method, a relation of propeller helical angles alpha, an inner friction moment M of a rotary supporting component and the verification performance of a propeller current meter is established, and aiming at mass production, the values of the alpha and the M are precisely determined; the alpha values are finely grouped, and according to a method of non-random quota sampling for the totality, random sampling for groups and weighted statistics for a result, a sample machine is precisely verified under a still water condition; meanwhile, theoretical calculating values are supplemented in verification for analysis and reference for correcting errors in time; through the measures, the total precision of the sample machine is guaranteed to be high; meanwhile, medium high and low speed standard linear formulas are used to ensure that the use of a hydrological testing current meter is precise and convenient; in production, the defects of the traditional mass production are overcome, and the workloads of verification works, labor intensity, power consumption, equipment overhaul and maintenance, and the like are reduced by 2/3; and the operation of verification procedures is scientific and normative and conforms to a modern production mode and a national standardized technical policy, so that the method has the advantages of better scientific, social and economic benefits.

The invention discloses a method for testing power generation performance of double-sided solar battery components by using multiple irradiation sensors. The method comprises the following steps: acquiring back irradiation data of a component; calculating linear irradiation in a certain position on a back plate of a battery piece; solving low-irradiation current distributed in different positionsby using a relation between irradiation and current; solving generated power of the back plate according to a mismatch model; calculating power gain of a double-sided battery; and calculating energy output of the double-sided battery. Through the method, the linear formula is firstly used for calculating the irradiation of the back plate and relatively accurately calculating a series of parameterssuch as irradiation amount, current in different positions of the back plate and the power generation amount of the back plate and the like; the method is of great significance to the deep study on the performance of the double-sided batteries.

The invention relates to the technical field of SCV combustor control, in particular to a control method for regulating fuel supply of an SCV combustor. The control method includes the following steps: 1, detecting LNG flow through an LNG flowmeter, inputting the LNG flow to a PLC which uses the LNG flow as an input value X, and calculating an opening value of a natural gas regulation valve through a formula Y1=aX+b, wherein the formula Y1=aX+b is obtained by that in a field test, the LNG flows with different loads are corresponding to different opening values of the natural regulation valve to form discrete point data, and then the discrete point data are connected into a curve, and a linear formula Y1=aX+b closest to the curve is searched through calculation. The control method can allow the SCV combustor to rapidly find an optimum output point according to change of the LNG loads, ensures a constant NG temperature, and allows the SCV to run stably, safely and reliably.

The present invention belongs to the field of the electronic signal processing, and discloses an image noise level estimation method on the basis of multi-level DCT (Discrete Cosine Transform) coefficients. The image noise level estimation method on the basis of the multi-level DCT coefficients comprises: dividing a target image with noise to be estimated into M*N 8*8 blocks, and performing DCT of each 8*8 block; measuring an edge degree of each 8*8 image block; selecting minimum element values, from the set of the obtained edge degrees, contributing 10% of the number of the elements in the set; searching out similar image blocks corresponding to a plurality of image blocks with minimum edge degrees; solving coefficient intermediate values, closely related to the noise level, of the selected similar image blocks; performing following operations on all the 8*8 image blocks to calculate and obtain an image structure correction factor; and performing the noise level estimation according to a non linear formula. The image noise level estimation method on the basis of multi-level DCT coefficients is able to improve the precision and the stability of the noise level estimation and satisfy the real time requirement of the noise level estimation, and has simple hardware realizability.