Results from Key International Comparisons in Photometry

Measurement Techniques -     

有机同位素稀释质谱法在CCQM—K5、CCQM—P10两项国际比对中的应用

研究了一种新的化学前处理过程,结合同位素技术形成了一种新的同位素稀释质谱方法,并应用于ＣＣＱＭ－Ｋ５（鱼油中农药Ｐ,Ｐ’－ＤＤＥ含量测定）及ＣＣＱＭ－Ｐ１０（鱼油中农药γ－六六六,Ｐ,Ｐ’－ＤＤＴ含量测定）关键比对。     

Development of International Key Comparisons in the Field of Chemico-Analytical Measurements

Measurement Techniques - The most challenging problems in the field of chemico- and bioanalytical measurements are described. These problems are being solved, in particular, by participating in new...     

The Algorithm for Processing Key Comparisons to Establish Equivalence between National Standards

To establish equivalence between national standards, it is proposed to consider a priori the key comparisons made as regards the selection of data belonging to a single population. It is also proposed to estimate reference values as arithmetic means or medians. All national standards are recognized as equivalent with these values for the uncertainties established from the comparisons.     

Results of Pilot Comparisons of National Standards for the Activity of Hydrogen Ions in Aqueous Solutions

Measurement Techniques - The enormous need for support of measurements of the hydrogen index (pH) in various branches of industry and the national economy of Russia make measurement of pH one of...     

Results of Comparisons of the Working Standards of Frequency Deviation

The results of comparisons of six working standards of frequency deviation, carried out using a new comparator, are considered.     

Identification and Handling of Discrepant Measurements in Key Comparisons

In a key comparison one or several measurement objects are circulated among a number of laboratories, each of which measures the quantities represented by the objects. In order to compare the measurement results obtained by the participating laboratories, the values represented by the circulated objects have to be established. These values, known as the key comparison reference values, and their associated uncertainties can easily be calculated by the method of least squares from the measurement results provided by the participating laboratories. Since this method requires that the measurement results be mutually consistent, a hypothesis that sometimes has to be rejected at a reasonable level of significance, a procedure for identification and handling of discrepant measurements is needed. In this paper such a procedure is suggested. It is demonstrated that although a key comparison reference value is attracted to a discrepant measurement result that has an uncertainty much smaller than the remaining results, the suggested procedure is able to identify this discrepant result. It is also demonstrated that the exclusion of a discrepant measurement result from the calculation of the reference values does not amplify the discrepancy of that result. As the discrepant result is not excluded from the comparison itself, the exclusion of the result in the calculation of the reference values should therefore be uncontroversial.     

National Standards of the Harmonic Coefficient Unit of the Russian Federation and the Republic of Belarus: Results of Comparisons

Measurement Techniques - The article presents the results of supplementary comparisons of the national standards of the harmonic coefficient unit of the Russian Federation (VNIIFTRI) and the...     

Analysis and Some Aspects of the Results of Key International Comparisons in the 83.8058–933.473 K Temperature Range

Results of the KC3 key international comparisons of temperature measurements, in which 15 national metrological institutes from Europe, America, Asia and Australia participated, are presented. The maximum differences between the results obtained by national metrological institutes amounted to 6, 3, 2, 3 and 1 mK, at the freezing points of Al, Zn, Sn and In and at the melting point of Ga respectively. It is shown that the results obtained at all the compared points at the D. I. Mendeleev All-Union Scientific Research Institute of Metrology are close to the results obtained at the NIST – the coordinator of the comparisons, and are near the mean values obtained by all the participants.     

中国参加温度关键比对结果分析

本文介绍了国际计量委员会(CIPM)组织国际关键比对的背景和已经开展的温度比对项目。对中国计量科学研究院参加的温度比对项目进行了系统介绍和结果分析。     

中国参加温度关键比对结果分析

本文介绍了国际计量委员会(CIPM)组织国际关键比对的背景和已经开展的温度比对项目。对中国计量科学研究院参加的温度比对项目进行了系统介绍和结果分析。     

Linking the Results of CIPM and RMO Key Comparisons With Linear Trends

A statistical approach to link the results of interlaboratory comparisons with linear trends is proposed. This approach can be applied to the case that the comparison artifacts have the same nominal values or the measured quantities have the same magnitudes. The degrees of equivalence between the pairs of National Metrology Institutes that have not participated in the same comparisons, and their corresponding uncertainties are established. The approach is applied to link the CCEM-K2 and SIM.EM-K2 comparisons for resistance at 1 G Ω level.     

采用国际标准的国家标准编写方法与技巧

本文对GB/T 20000.2-2009中这3个要素的主要编写要求进行了梳理,提出用对比法和条件分析法来掌握编写采标标准主要编写要求的方法和技巧,从而避免出现类似问题,提高标准编写的质量。     

Measuring the Specific Activity of 238Pu in Solution for International Key Comparisons

Two methods are considered for measuring the specific activity of ²³⁸Pu in solution that have been used at the Mendeleev All-Russia Metrology Research Institute in key comparisons of national standards for radionuclide activity units: the 4(PC)-LX coincidence method and the defined solid-angle one. The results for the specific activity from the two methods have agreed within the estimated combined uncertainty of 0.15%.