9762 papers found
In the report present results of investigation methods of an estimation of measurements in nonlinear dynamic systems. It is shown that a main feature that must be taken into account at the analysis of measuring results consists in the condition of the stability and the stationary of the open dynamic system.
Testing and calibration of geodetic instruments is a major issue in metrological procedure, having strong impact in precise geodetic and industrial instrumentation. This paper describes and analyses newly developed angle measurement methods as well as compares both newly developed and classic angle measuring methods. Several recently developed and enhanced methods of angle measuring systems are presented in the paper.
This paper deals with the analytical-statistical method of one of the most used biometrics, the face recognition. The research project shows changes in face of ten different women, and emotional changes of one woman. The distances’ changes of the chosen anthropological points were measured to obtain better understanding of programming requirements for better reliability of those systems. As the measurements were done entirely manually and processed by the spreadsheet program, it was also compared to some of the values obtained earlier by fully computerized method. To acquire comparable data,...
This paper describes the concepts for software in legal metrology and presented proposals for the concept diagram around concept software in legal metrology for the new edition of the International Vocabulary of Terms in Legal metrology (VIML).
This paper describes the main concepts for legal metrology, which listed in the International Vocabulary of Terms in Legal metrology (VIML). In paper presented reasonable proposals for the concept diagrams around legal metrology concepts for the new edition of the VIML.
This paper describes a new time-interval measurement system of high resolution, which contains sixteen multi-tap delay lines. In practice, during single measuring cycle sixteen time-stamps are registered and collected twice. It means that measured time-interval can be precisely interpolated from collection of time-stamps even after each measuring cycle. This solution leads straight to increase of resolution measurements and to limit total duration time of the measurements. Indirectly, such system architecture leads to decrease of duty cycle of the measurement instrument and limits energy...
This paper describes how to measure the plasma temperature and density using laser Thomson scattering signal. Electron energy probability functions (EEPFs) having a fine resolution of electron energy were measured in low-pressure inductively coupled plasma with laser Thomson scattering method (LTS) at various plasma conditions (rf powers and gas pressures) and compared with the EEPFs measured by a single Langmuir probe (SLP) at the same experimental conditions. The result of LTS showed that the measured electron density normally increases with the rf power and the gas pressure, and the...
Design principles and operation of radiofrequency (RF) sensor for measurement of liquefied petroleum gas (LPG) mass in a reservoir are considered. Designed and tested measuring system containing RF mass sensor provides LPG counting by mass with error not more than ± 0,5 % under real storage conditions in reservoirs is described.
Multidimensional ordinal measurement in a form of problem of a single consensus ranking determination for m rankings of n alternatives is considered in the paper. The Kemeny rule is one of deeply justified ways to solve the problem allowing to find such a linear order (Kemeny ranking) of alternatives that a distance (defined in terms of a number of pair-wise disagreements between rankings) from it to the initial rankings is minimal. But computational experiments outcomes show that the approach can give considerably more than one optimal solutions what argues instability of the measurement...
The perception of similarity among faces is investigated, to put face measurement on a sound foundation. The goal is to obtain insight in the process of human face recognition, and to apply these ideas to automatic face recognition procedures, in order to increase their efficiency and robustness, when operating in difficult measurement conditions. Two procedures are investigated, the eigenface method and the repere-points approach, that have complementary properties.