33 results about "F-test" patented technology

The invention relates to a preparation method and application for an electrochemiluminescence sensor based on protein activity protection and belongs to the technical field of electrochemiluminescencedetection. An efficient electrochemiluminescence behavior capable of being achieved by europium-doped gadolinium phosphate through excitation under low potential is developed and is verified for thefirst time. The fixing problem of a luminescent material on an electrode is solved. The effective preservation problem of antigen-antibody activity is also solved. Concentrations are detected according to the fact that intensities of electrochemiluminescence signals responding to procalcitonins of different concentrations are different. Through F-test and T-test, accuracy and precision of the method are shown. Test results are smaller than a theoretical value. The method is accurate and reliable.

The invention provides a fault diagnosis method and device for an electro-hydraulic servo valve, a computer readable storage medium and electronic equipment. The method comprises the following steps:acquiring data of a plurality of electro-hydraulic servo valves; dividing an obtained characteristic curve into an upper half part characteristic curve and a lower half part characteristic curve by taking a flow value as an boundary; calculating a flow difference value of the upper half part characteristic curve and the lower half part characteristic curve, which correspond to the same current value; adopting a Kolmogorov-Smirnov method to verify whether each flow difference value meets Gaussian distribution or not; if each flow difference value meets Gaussian distribution, calculating a meanvalue and standard deviation of the flow difference value of the upper half part characteristic curve and the lower half part characteristic curve of each electro-hydraulic servo valve; separately performing statistiacal verification on each electro-hydraulic servo valve by F-test based on statistics, and judging whether each electro-hydraulic servo valve has faults or not. The method and the device realize efficient and accurate diagnosis for faults of the electro-hydraulic servo valves, and provide large data basis for electro-hydraulic servo valve fault identification.

The invention belongs to the technical field of finished automobile information and entertainment systems, and relates to an objective quantification method for subjective evaluation of a warning property of an automobile warning tone. The method includes the steps that a multiple linear regression model is established, a subjective evaluation performance value is taken as a dependent variable, an acoustic parameter value is taken as an independent variable, the model is alpha = a * L + b * Sh + c * F + d, and in the formula, alpha is the subjective evaluation performance value; l is the loudness, Sh is the sharpness, and F is the frequency of the sounding interval, and a, b, c and d are undetermined coefficients; regression analysis is performed by adopting a step-by-step method; independent variable selection is performed according to a rule that a variable with a P value of less than or equal to 0.050 enters and a variable with a P value of more than or equal to 0.100 is shifted out according to an F test; acoustic parameter values are input into a formula for subjective evaluation performance value calculation, and when the prediction error of the subjective evaluation performance value is within 10%, it is considered that the multiple linear regression model has the effect of predicting a subjective evaluation result through automobile prompt tone objective test data. The influence of human factors on the evaluation result is reduced, the discreteness of the evaluation result is reduced, the evaluation efficiency is improved, and the authority of evaluation is increased.