correlation coefficient

Modeling of the impurity diffusion process in a layer under the action of a system of random point sources is carried out.  Mass sources of different power are uniformly distributed in a certain internal interval, that may also coincide with the entire region of the layer.  The statistics of random sources is given.  The solution of the initial-boundary value problem is found as the sum of the homogeneous problem solution and the convolution of the Green's function with the system of the random point sources.  Averaging of the solution is performed on the internal subinterval and in the ent

The main error of rotary gas meters may change during their operation because of mechanical wear of the meter moving parts. Control of changes in metrological characteristics of meters is carried out during periodic metrological verifications. In this paper, an investigation of the change in a main error of rotary gas meters during their operation was carried out based on the results of their metrological verification. The paper considers the results of periodic metrological verifications of rotary gas meters in the laboratories of four gas distribution companies.

This article is devoted to the substantiation of the possibility of electrical capacitance measurement utilizing equations that are based on the approximation of scattering ellipse, formed by signals proportional to the current flowing through the capacitive tested object and voltage drop on the tested object.

The interrelations between the air temperature and humidity, the amount of precipitation and the water level fluctuations have been investigated based on long-term observations at the permanent water gauge of Lake Svitiaz. The average values of the correlation coefficients between the meteorological factors and the water level for the period of 1985-2019 are calculated.

Now for the developed countries of the world community is inherent to ensure quality by organizational and management measures, namely development, implementation, certification and continuous improvement of quality systems. Proceedings of the outstanding scientists of the twentieth century W. Shewhart, W. E. Deming, Joseph M. Juran (first introduced the concept of “quality control”), F. Crosby, K. Ishikawa, Armand V. Feigenbaum, H. Taguchi, T. Seyfi formed a modern strategy based on the application of quality management systems (QMS).

In this paper an optical scheme and the operation principle of strain monitoring based on the interference between guided modes in multimode polymer optical fiber is investigated. The possibility of measuring of the relative strain by processing of speckle patterns at the exit face of multimode fiber is studied theoretically and experimentally. The algorithm of correlation processing of speckle pattern is developed too. The recent progress of polymer technology allowed the application of plastic optical fiber in sensor design.

Purpose. Run trial of criteria importance of systematic errors in the mathematical processing of results of measurements of double equally accurate and install the most efficient one. Thus, to determine how to calculate the probability of trust and develop a method of exclusion bias of the mean values of double equally accurate measurements. Methods of resolving the issues raised based on the comparative analysis formulas, experimental results of calculations, developing proposals and reports. Established that the literature significance tests are not the same bias. Results.