The article addresses the issue of outliers in metrological measurements, which can significantly distort research results and affect measurement accuracy. Outliers that substantially differ from other data points in a sample seriously threaten the reliability of metrological processes. In previous studies, the Isolation Forest model was applied to detect such outliers, demonstrating its effectiveness under certain conditions.
In this work, a new conversion method is proposed, which makes it possible to implement recurrent logarithmic analog-to-digital converters (LADCs) with a constant base of the logarithm $(\zeta)$, in which the reference voltages are formed using a reference voltage divider composed of identical $L-$shaped links of resistors $R-R^{\prime \prime}$ and additional resistor $R^{\prime}$, and the values of the resistors are set according to the formulas
$R^{\prime}=\frac{\zeta}{1-\zeta} \cdot R$ and $R^{\prime \prime}=\frac{\zeta}{(1-\zeta)^2} \cdot R$.
Розглянутий багатоточковий метод реалізації температурної шкали. На основі комп’ютерного моделювання проведений порівняльний аналіз різних методик її побудови. Обґрунтовано переваги застосування комбінованого методу для реалізації температурної шкали.
In the article the method of multipoint temperature scale. Based on computer modeling of the comparative analysis of different methods conducted. The advantages of the use of the combined method for the realization of the temperature scale.
На основі комп’ютерного моделювання проаналізовано інструментальну та методичну складові похибки вимірювання температури методами багатоканальної термометрії випромінення. Визначено умови, за яких доцільне їх застосування, та загальні недоліки використання цих методів. Запропоновано методику багатооканального вимірювання температури.
The authors investigated the effect of changes in the acoustic signal propagation speed and the accuracy of sensor positioning on the accuracy of sound source localization. The mean absolute error grows with the displacement of the microphones relative to the nominal coordinates (X, Y). The same trend is observed with an increase in the actual acoustic signal velocity deviation from the velocity under normal environmental conditions.
In applied geodesy tasks, it may be necessary to determine spatial angles. When bringing a 3D design of buildings and structures to the field with the help of an electronic total station (ES), it is important to verify the spatial angles between different elements of building structures such as roof overlaps, inclined anchors, and more, using the characteristic points' spatial coordinates. Modern geodetic instruments provide sufficiently high measurement accuracy (up to 1" and 1 mm, respectively).
Sensors with a frequency output signal are marked as particularly high accuracy, it is easy to switch, and signals may be transmitted over long distances. The main element of such sensors is an electromechanical oscillator connected to the feedback of the autogenerator. String metal oscillators do not provide the required measurement accuracy due to unsatisfactory elasticity, hysteresis, relaxation, and drift of characterisrics. The creation of oscillators made of quartz and silicon due to the perfection of these materials, is difficult.
The current state of development of the metrological provision of measuring equipment for the competitiveness of products, safety at work (radiation safety), obtaining objective diagnostic information in medical practice is analyzed. Metrological support is one of the main steps in the production process that influences the measurement results and their qualitative evaluation.
The article focuses on the main problems of metrological confirmation of measuring instruments in accordance with international requirements and considers possible directions of their solution. One of the main tasks of metrology is assurance of the uniformity of measurements, that is, the state of measurements, in which their results are expressed in the legal units, and the characteristics of errors or uncertainty of measurements are known with a certain probability and do not exceed the established limits.
This work is devoted to the issues of processing holes in different thickness of tubular billets great length deforming broaching. The urgency of this problem is substantiated. The results of studying the regularities of deformation of a material in the deformation zone under deforming broaching are presented. The reasons for the formation of this type of geometric error as the curvature of the axis of the machined hole are established.