4 results about "Logistic distribution" patented technology

This invention provides a method and system for detecting impurities in flunarizine hydrochloride raw material. The detection method includes: acquiring the original chromatographic signal, performing empirical mode decomposition for denoising and baseline optimization to obtain a baseline-corrected and denoised chromatogram; determining the signal-to-noise ratio based on the energy relationship between noise and signal in preprocessing, determining the optimal analytical scale through a preset function, determining the number of chromatographic peak components by screening ridges through continuous wavelet transform, and extracting initial model parameters; establishing a mathematical model for the convolution of a standard Gaussian function and a modified Logistic distribution function for each component peak, using a trust-region reflection algorithm for nonlinear iterative fitting, with the objective function containing a least-squares residual term and a weighted regularization term; after the objective function converges, obtaining the optimal model parameters, and calculating the integral area of ​​each impurity component peak to determine its content.

The application discloses a method for quantitatively predicting premature creep failure of high-temperature alloy based on error distribution, comprising the following steps: predicting creep rupture performance to obtain predicted creep rupture time and stress; obtaining predicted time error and predicted stress error by using the predicted creep rupture performance and experimental data; fitting the predicted error by using logarithmic-logistic distribution and establishing improved logarithmic-logistic distribution; obtaining statistical data of the predicted error distribution, including the width of the distribution, the probability and position of outliers, etc., by using the improved logarithmic-logistic distribution to fit the predicted error; according to the effectiveness of the distribution fitting graph and the regression graph evaluation method, determining the best fitting method according to the width of the distribution, and predicting the probability of premature creep failure of the material according to the position of the outliers. The method is simple and efficient, can quantitatively predict premature creep failure of most austenitic steel, high-chromium steel and nickel-based alloy, and has the characteristics of stable and reliable results.

The invention relates to the technical field of hydrology and meteorology, and discloses a summer corn drought detection method and system.The method comprises the steps that day-by-day precipitation and evaporation capacity data in a certain area are obtained, and the effective precipitation and the actual water demand of summer corn are obtained; obtaining a difference value between the effective precipitation amount and the actual water demand amount of the summer corn within a certain period of time; performing trend fitting on the difference value D < t > by using a smooth spline so as to replace a position parameter of Log-logistic distribution, and obtaining a time-varying position parameter; acquiring Log-logistic distribution of a time-varying time sequence according to the time-varying position parameters, estimating the parameters by using a probability weighted distance method PWMs based on empirical frequency, and standardizing drought detection indexes; the invention provides a new non-stationary drought index of the summer maize, which considers the requirements of different crops in growth stages on moisture and the difference of drought tolerance, and can realize day-by-day fine detection of the drought of the summer maize.

The present application relates to the technical field of supply chain management, in particular to a medicine supply chain scheduling method and system based on reinforcement learning, comprising the following steps: obtaining the temperature difference inside and outside the carriage and the heat conduction coefficient to calculate the heat penetration rate and the thermal safety time limit, planning the path and correcting the speed based on the congestion index to obtain the predicted passing time, comparing the time limit with the deadline to generate the action mask vector, inputting the environmental parameters into the neural network to output the score, and using the action mask to correct and generating the scheduling instruction through the Softmax function. In the present application, the thermal safety time limit is accurately derived, the thermal safety time limit and the delivery deadline are used as double constraints to construct the action mask to eliminate invalid nodes, multi-dimensional parameters are input into the neural network and the probability distribution is generated under the mask constraint, and it is ensured that the vehicle scheduling instruction follows the temperature control safety threshold, effectively avoiding the risk of drug heat failure and improving the accuracy of cold chain logistics distribution.