Metrological Characteristics of MN-3 Solid-Body DC Voltage Measures

Results of theoretical and experimental investigations into the statistical characteristics of the voltage instability of type MN-3 measures are presented. The capabilities of linear mathematical models of the voltage instability of solid-body measures are considered and evaluated. It is shown that MN-3 type measures maintain a relative measurement (comparison) error in the range 1·10^–8–3·10^–8 only for a measurement period t 1 h and that with t 1 day, the error increases to values in the range 5·10^–8–8·10^–8, while when t 1–3 months it increases to 5·10^–7.     

Metrological Traceability of Coomet Reference Materials. Part. 1. International Practice in Establishing Traceability of Reference Material Certified Values

Measurement Techniques - Many countries are currently focused on expanding the range of national means for measurement unit transfer characterized by established metrological traceability within...     

Metrological Traceability of Coomet Reference Materials. Part. 2. Characterization of Reference Materials

Measurement Techniques - The article describes an approach to establishing the metrological traceability of reference materials adopted by TC 1.12 Reference Materials of the Euro-Asian Cooperation...     

应变传感器计量特性的校准方法

为了合理评价应变传感器（应变计）的计量特性,讨论了应变计的相关国家标准和技术规范中计量特性的不同之处,并以振弦式应变计为例,归纳出应变计的计量特性参数。对应变计校准现状进行分析,设计了一种基于激光干涉法的高精度校准装置,标距范围可以达到500mm,并提出了系列计量特性的高精度计算方法。通过试验对应变计的计量特性进行测试,并评估了综合误差的校准不确定度U=0.10%（包含因子k=2）。     

Metrological Characteristics of Self-Oscillating Transducers for Track Control Systems

Measurement Techniques - This is a study of the sensitivity and accuracy characteristics of three of the best known types of self-oscillating displacement transducers with flat screens which serve...     

Spectral,Dosimetric, and Metrological Characteristics of Radiochromic Radiation-Sensitive Compositions

Measurement Techniques - Questions of ensuring radiation safety during irradiation of equipment in the medical, agricultural, and foodstuffs industry are discussed. Means for measuring absorbed...     

Dissolution Characteristics of Benzoic Acid and Salicylic Acid Mixtures in Reactive Media

The dissolution rates of mixtures of the two acids, benzoic acid and salicylic acid were determined in a phosphate buffered medium. Dissolution properties from compressed discs under sink conditions were essentially linear. Plots of dissolution rate versus compact composition deviated from the two component models for both non-interacting and interacting components. Dissolution rates, particularly for benzoic acid at intermediate weight fractions, were lower than predicted by the theory for two non-interacting components. These lower than expected rates were explained in terms of the physicochemical changes occurring in the microenvironment at the solid liquid interface.     

Indirect Methods of Determining the Metrological Characteristics of Seismic Transducers

The advantages and disadvantages are considered of an indirect method of verifying and calibrating seismic transducers. An instrument is proposed which utilizes a personal computer in order to implement the indirect method.     

Computer Modeling of the Metrological Characteristics of Standard Measuring Instruments

The possibilities are considered of the computer modeling of the metrological characteristics of a standard instrument for measuring spectral noise power density utilizing low-temperature waveguide noise generators operating in the millimeter wavelength range.     

Dissolution Characteristics of Benzoic Acid and Salicylic Acid Mixtures in Reactive Media

Abstract

The dissolution rates of mixtures of the two acids, benzoic acid and salicylic acid were determined in a phosphate buffered medium. Dissolution properties from compressed discs under sink conditions were essentially linear. Plots of dissolution rate versus compact composition deviated from the two component models for both non-interacting and interacting components. Dissolution rates, particularly for benzoic acid at intermediate weight fractions, were lower than predicted by the theory for two non-interacting components. These lower than expected rates were explained in terms of the physicochemical changes occurring in the microenvironment at the solid liquid interface.     

基于多参数监护仪计量特性的检定规程建议及探讨

阐述多参数监护仪心电信号、心率、血氧饱和度、无创血压、体温和呼吸速率等重要参数的计量特性,并依据多参数监护仪的实际应用及发展趋势,对JJG(闽)1038-2011多参数监护仪检定规程的不足之处提出自己的见解,对部分参数的计量性能要求和检定方法提出思路和改进建议。     

Improving the Metrological Characteristics of a Multicavity Black Body Model

The importance of optimizing the design parameters of the shaping elements of the radiating surface of a multicavity model of a black body at the upper limit of the effective temperature range of the radiator is evaluated.     

Method for Assessing the Metrological Characteristics of Reference Measures of a Unit of the Complex Reflection Coefficient in Waveguides in the Millimeter Wavelength Range

Measurement Techniques - We perform the analysis of the current state of measurements of complex reflection coefficient in waveguides at millimeter wavelengths. We propose an approach to the...     

Metrological Characteristics of Algorithms for Geometrical Calibration of Horizontal and Tilted Cylindrical Vessels

An approach is described in the geometrical method of calibrating vessels in which simulation is applied to examine the metrological characteristics of complicated algorithms for processing measurements.     

Metrological analysis of type MTs-3 cesium frequency reference

Measurement Techniques -     

Methods and Facilities for Determining the Metrological Characteristics of Contact Heat Flow Transducers

Questions of metrological provisions for contact heat flow transducers by means of which it is possible to monitor heat losses at the surface of thermal energy objects are considered.     

Voltage Standards Based on Precision Stabilitrons: Metrological Characteristics and Area of Application

Areas of application of solid-state voltage standards are considered, the metrological characteristics of Russian and foreign standards required and realized in practice are presented, and areas for further research are indicated.