CONTENTS

I. INSTRUMENTS AND METHODS OF MEASUREMENT (BY TYPE OF MEASUREMENT)
S.L. Pasynok
Rapid combined EOP values evaluation by the weighted median method ……. pages 8–20
A.V. Naumov, V.B. Pudlovskiy, A.A. Karaush
Time scales comparison methods using geostationary satellites ……. pages 21–33
M.G. Gurov, E.G. Gurova
Operation mode of the strontium optical lattice clock with internal cryogenic chamber ……. pages 34–46
A.I. Bykov, A.S. Katkov
Study of digital-to-analog converters to expand metrological capabilities in the field of low-current measurements ……. pages 47–57

II. NAVIGATION INSTRUMENTS
M.M. Murzabekov, D.S. Bobrov, V.P. Lopatin, F.R. Smirnov
Current state of Earth’s gravity field parameter meters for arctic applications ……. pages 58–72

III. METHODS AND INSTRUMENTS FOR MONITORING AND DIAGNOSTICS OF MATERIALS, PRODUCTS, SUBSTANCES AND THE NATURAL ENVIRONMENT
D.V. Averkin, A.A. Barannik, D.M. Balakhanov, V.I. Dobrovolskiy
Determination of metrological characteristics of the reference materials of the zeta potential in a liquid ……. pages 73–83
D.V. Averkin, A.A. Barannik, M.A. Averkina
Development of the MDP-P90 zeta potential reference material ……. pages 84–95
A.E. Aslanyan
Estimation of the dependence of the effective area of the counterpressure piston-cylinder unit on the applied liquid ……. pages 96–102
E.V. Davydova
Research of biotechnological systems — from theory to practical application ……. pages 103–128

IV. METROLOGY AND METROLOGICAL SUPPORT
V.F. Fateev
Relativistic justification of the experiment to determine the difference in gravitational potentials between ground points based on measuring the gravitational frequency shift in a duplex satellite communication channel ……. pages 129–149
O.V. Kolmogorov
Mathematical model of error of fiber-optic time scale comparison systems using fiber-optic communication lines with bidirectional optical amplifiers ……. pages 150–160
M.M. Mikhailov
Estimation of insertion losses of the reference test site for EMC tests ……. pages 161–174

V. ACOUSTICS
D.V. Golovin
On estimating the accuracy of reproducing sound pressure in an infrasound pistonphone ……. pages 175–193