Open Access
Subscription Access
No 6 (2015)
GENERAL PROBLEMS OF METROLOGY AND MEASUREMENT TECHNIQUES
3-9 132
Abstract
The application of the chi-squared Pearson test in testing hypothesis of normality has been considered. Tables of percentage points and approximations of the limiting statistic distributions have been obtained. The power of the Pearson and Nikulin-Rao-Robson chi-squared tests has been estimated for various pairs of competing hypotheses. The comparative analysis of normality tests in terms of power has been presented.
10-11 173
Abstract
A brief review of weight functions application during calculation of estimates for reference grids nodes based on data of randomly distributed points of ground measurements is presented. The problem of maximum estimates formation for these nodes by means of logarithmic modification of Barnes and Cressman functions at norming of these estimates with fixed integral value of used weight function is formulated and solved.
12-14 77
Abstract
It is shown that the reliable measurements of controlled parameters, assuring the correct assessment of compliance airworthiness standards should be carried out in the frames of the acceptable risk concept. An adequate mathematical model of metrological assurance of conformity assessment depends tolerance interval, mainly parametric as the most cost-effective according to the required volume measurements. The original method of such interval constructing for a broad class of distributions is suggested.
LINEAR AND ANGULAR MEASUREMENTS
15-17 104
Abstract
The results of computing the hollow cylinder sample form-factor at shear deformation are presented. This form-factor takes into account an influence of the sample dimensions and Poisson’s ratio on measurements of shear modulus.
18-20 85
Abstract
A procedure for determination of temperature coefficients of end standards of meter linear expansion was proposed and practically tested. It allows to exclude the effect of thermal deformations of measurement system constructive parts on the results of there coefficients determination. The recommendation on procedure application are also presented.
21-25 82
Abstract
The issue of establishing a database of reference objects for the construction of condition monitoring, identification and prevention of emergency situations and evaluation of consequences of emergency situations (flow, damage) on the basis of the analysis and modeling in geographic information systems are considered.
OPTICOPHYSICAL MEASUREMENTS
25-29 95
Abstract
The problems associated with the development of the field of metrological assurance of measurements of optical radiation average power in the spectral range of 0,6-1,7 microns for optical fiber communication and information transfer sistems, the creation of the State primary standard 170-GET.
30-32 87
Abstract
The characteristic determining the degree of difference between the measured laser beam intensity distribution from the Gaussian distribution, called the «Gaussikeness» has been considered. It is the alternative to distribution coefficient laser bunch.
33-36 79
Abstract
The two-position cirquit for measuring the geometric formfactor of fields of view of two receiving channels is suggested. The parameters of beam probing depth in scattering medium determined by overlaps of fields of view within it have been introduced. These parameters are indicators of the extinction coefficient and the geometry. The nephelometer mode is optimal for measuring. The use of the full set of indicators allows to estimate the accuracy of extinction coefficient measurement within the layer.
37-40 72
Abstract
The decrease of image distortion and the blur of images is the main requirement for optical measuring systems. The dependence of the distortions of images from the sizes of the lens determined with high accuracy allowed to reduce the objective size. The application of analytical assessment leads to decrease of image distortions by means of more accurate selection of the lens sizes and other optical circuit parameters.
TIME AND FREQUENCY MEASUREMENTS
41-45 83
Abstract
The theory of relativity is applied to analyze the impact of the Earth rotation irregularity on the frequency and time of high stability atomic clocks. The precession and nutation of Earth rotation axis, variation of absolute value of rotation velocity and angular momentum of the globe have been considered. It is shown that the relative shift of time and frequency caused by the above reason can exceed 5∙10-16.
MECHANICAL MEASUREMENTS
46-49 99
Abstract
The problem of selection of parameters of inertance (density, size) of flare particles required for visualization and optical diagnostics of vortex flows has been considered. An expression for dynamic relaxation time determination for flare particles tracing the gas motion in vortices of different intensity was received. An example of particle parameters selection for visualization of laboratory-simulated air vortex funnel is described.
49-52 78
Abstract
The principle of operation of microelectromechanical self-maintained system based on a string sensitive element with use of a single-crystal silicon and piezoelectric films is described. The results of preliminary (qualitative) modeling of self-oscillatory system are presented and its certain features are described.
RADIO MEASUREMENTS
53-56 69
Abstract
The equipment for diagnosties of thermionic emitting cathodes at mass production and based on measurement of noise generated by cathodes in electronic devices has been developed. The problems of automation and noise immunity during measurements for restriction of diagnostics time are considered and solved. A software allowing to control the measurement modes and to carry out the noise characteristics studies and to find the noise informative parameters has been created.
57-58 96
Abstract
To assess the delays of the dipole type antenna the phase-frequency characteristics of thin biconical antenna have been calculated. The analytical expression determining the group delay time (group delay) through the of the antenna parameters has been obtained.
ACOUSTIC MEASUREMENTS
59-63 70
Abstract
During carrying out the metrological works it was proposed to create a comprehensive laboratory model of underwater receiver to obtain on its basis the receiver metrological characteristics adequate to purposes and conditions of receiver intended application.
ИЗМЕРЕНИЯ ИОНИЗИРУЮЩИХ ИЗЛУЧЕНИЙ
63-67 138
Abstract
The principal approaches to construction of spectrometric diamond detector of ionizing radiation fluxes has been considered. The instrument is intended for continuous monitoring of the spacecraft onboard radiation safety for prompt taking measures for active protect and to prediction of the residual life time of space transportation systems.
MEDICAL AND BIOLOGICAL MEASUREMENTS
67-70 86
Abstract
The expert systems architecture with image recognition procedures in hardware-software measuring complexes of cancer diagnosis is considered. The histological method as the most important method of oncomorphology was used as the base. The knowledge model and the model of expert measurement procedures in high-tech information-measuring complexes of histological diagnosis of cancer were developed. The models adequacy is confirmed by the high efficiency of implementation of the developed systems in clinical practice.
PHYSICOCHEMICAL MEASUREMENTS
71-73 87
Abstract
The dynamic characteristics of a miniature thermal conductivity sensor in comparison with the characteristics of a standard thermal conductivity sensor and a flame-ionization sensor are considered. Тhе dynamic characteristics were estimated by the time constant of the sensor. It was shown that this sensor has a high sensitivity and is also characterized by a small time constant. The use of such a detector in gas express analyzers and systems for high-speed chromatography is suggested.
