Results 281 to 290 of about 5,205,037 (347)

State primary standard of optical density unit GET 206-2016

Izmeritel`naya Tekhnika, 2021
The description of the State Primary Standard of optical density unit GET 206-2016 is given. The principle of operation of the standard, based on filtering the luminous flux of transmitted and reflected light, is described. The composition of the standard and its metrological characteristics are presented.
Dmitriy N. Zyablikov, Aleksandr V. Ivanov, Artem V. Koldashov, Sergey N. Marchenko   +3 more
openaire   +1 more source

State primary standard for the pH scale

Measurement Techniques, 1998
Information is given on the state primary standard for the pH scale that has been set up at VNIIFTRI. The measurement system is described and certification results are given. The future development of pH measurement in Russia is considered.
N. N. Zdorikov, O. V. Karpov, I. I. Maksimov, E. E. Seiku, V. V. Sobol'   +4 more
openaire   +1 more source

State primary standard of ellipsometric angles GET 186-2017

Izmeritel`naya Tekhnika, 2020
Paper describes the structure, principle of work and metrological characteristics of the State primary standard of ellipsometric angles units GET 186-2017, which provides measurement of the two-dimensional spatial distribution of ellipsometric angles.
Gennady N. Vishnyakov, Gennady G. Levin, Vladimir L. Minaev   +2 more
openaire   +1 more source

Coulometric device within a unit for state primary standards

Measurement Techniques, 2010
The operating principle and composition of the VNIIFTRI coulometric device is based on a three-chamber electrochemical cell of vertical construction that is part of the set of primary state standards for the pH scale and indices of pX ion indices. Metrological characteristics of the device ensure reproducibility of pH in the standard with an error of ...
M. A. Artemenkov, O. V. Karpov, V. D. Kutovoi, V. A. Zvezdina   +3 more
openaire   +1 more source

State Primary Standard of the Unit of Infrared Radiance

Measurement Techniques, 2001
A description is given of the State primary standard approved in 2001 for the unit of infrared radiance.
I. I. Dolgikh, A. I. Pokhodun, O. V. Rybolovleva, V. V. Smirnova   +3 more
openaire   +1 more source

The state primary standard for the unit of refractive index

Measurement Techniques, 2004
The structure, working principle, and basic metrological characteristics are given for the State primary standard for a unit of refractive index GET 138-2003.
G. N. Vishnyakov, G. G. Levin, S. V. Kornysheva   +2 more
openaire   +1 more source

GET 186–2017 State Primary Standard of Units of Ellipsometric Angles

Measurement Techniques, 2020
The composition, operating principle, and basic metrological characteristics of GET 186–2017, the State Primary Standard of units of ellipsometric angles, a Standard that supports measurement of the two-dimensional spatial distribution of ellipsometric angles, are described. The structure of GET 186–2017 includes a spectral ellipsometer equipped with a
G. N. Vishnyakov, G. G. Levin, V. L. Minaev   +2 more
openaire   +1 more source

State primary standard of the unit of electric resistance ? Ohm

Measurement Techniques, 1971
The following conclusions can be made as a result of investigations of the state standard of the unit of resistance. 1. The state resistance standard ensures maintenance of the unit of resistance and the assignment of its value to secondary standards with an error error of 1 · 10−7, which indicates a sufficiently high metrological level.
I. N. Krotkov, V. P. Shigorin
openaire   +1 more source

Modernized state primary standards of the units of thermal quantities

Measurement Techniques, 2009
The content and results of efforts to modernize the three State Primary Standards of the units of temperature in the 0–3000°C range and also of the standards of thermal conductivity and coefficient of linear expansion of solids, stored at the Mendeleev Research Institute of Metrology, are described.
A. I. Pokhodun, T. A. Kompan, N. A. Sokolov, S. F. Gerasimov, M. S. Matveev, V. A. Nikonenko, A. S. Korenev, N. V. Churilina   +7 more
openaire   +1 more source

Standards for Primary-Grade Reading: An Analysis of State Frameworks

The Elementary School Journal, 1999
The purpose of this article is to analyze state standards for early reading/language arts from 2 perspectives-what is known about standards and what is known about early reading. Guided by criteria that address equity, content, and specificity established by the Council of Chief State School Officers in collaboration with 9 other educational ...
Karen K. Wixson, Elizabeth Dutro
openaire   +1 more source