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1. Re-Certification of SRM 2492: Bingham Paste Mixture for Rheological Measurements
Special Publication (NIST SP)
Chiara F Ferraris, Alex Olivas, William F Guthrie, Blaza Toman
Rheological measurements are often performed using a rotational rheometer. In this type of rheometer, the tested fluid is sheared between two surfaces, one of which is rotating . Usually, an angular velocity is imposed on the fluid (through the ro ...
2. Pass / Fail / Inconclusive Criteria for Inter-Laboratory Comparisons
Blaza Toman, Bodo Mickan, Gerd Wubbeler, Olha Bodnar, Clemens Elster, John D Wright
Inter-laboratory comparisons use the best available transfer standards to check participants uncertainty analyses, identify underestimated uncertainty claims or measurement errors, and improve the global measurement system. For some measurands (e.g. ...
3. Critical Assessment of Current Practice in the Analysis of Key Comparison Data with Suggested Improvements
Blaza Toman, Clemens Elster
The current practice in the analysis of key comparison data is discussed and critically assessed. We argue that there is an ambiguity in the definition and meaning of the (unilateral) degrees of equivalence as defined in the MRA. This ambiguity can b ...
4. A Case Study of a Community Affected by the Witch and Guejito Fires: Report #2 ‹ Evaluating the
Effects of Hazard Mitigation Actions on Structure Ignitions
Technical Note (NIST TN)
Alexander Maranghides, Derek McNamara, William Mell, Jason Trook, Blaza Toman
The National Institute of Standards and Technology (NIST) has a suite of research projects
addressing risk reduction in Wildland Urban Interface (WUI) communities. The NIST WUI Team was
invited by CAL FIRE to collect post incident data from the ...
5. Standard Reference Material 2366 for Measurement of Human Cytomegalovirus DNA
Ross J Haynes, Margaret C Kline, Blaza Toman, Calum Scott, Paul Wallace, John M Butler, Marcia J Holden
Cytomegalovirus (CMV) is one of a number of human viruses that are ubiquitous in human populations,
generally cause little illness upon infecting healthy individuals, but can cause life threatening
disease in immune-compromised individuals. An i ...
6. Final report of key comparison CCM.P-K12 for very low
helium flow rates (leak rates)
James A Fedchak, Blaza Toman, Karl Jousten
Quantitative leak tests with vacuum technology have become an important tool in industry for
safety and operational reasons and to meet environmental regulations. In lack of a relevant
key comparison, so far, there are no calibration measurement ca ...
7. Experimental Design and Data Evaluation Considerations for Comparisons of Higher-Order Value-Assigned Materials
David Lee Duewer, Hugo H. Gasca-Aragon, Katrice A Lippa, Blaza Toman
The analysis of higher-order value-assigned materials (HOVAMs) such as certified reference materials (CRMs) and value-assigned proficiency testing materials can help assess the equivalence of chemical measurement processes. When two or more such mat ...
8. Alternative Analyses of Measurements of the Planck Constant
We compare different methods for the adjustment of the Planck constant using recent, inconsistent
data. First we discuss the popular Birge ratio method. By stating the underlying statistical model we
critically assess and modify this method. We the ...
9. An international assessment of the metrological equivalence of higher-order measurement services for creatinine in serum
Johanna Camara, Katrice A Lippa, David Lee Duewer, Hugo H. Gasca-Aragon, Blaza Toman
Background: The CCQM-K80 Key Comparison directly assessed the equivalence of many of the world‰s higher-order value-assigned materials (HOVAMs) for creatinine in human serum. This 2009 international study compared the certified values and uncertaint ...
10. A Bayesian Approach to the Evaluation of Comparisons of Individually Value-Assigned Reference Materials
A new data analysis procedure is presented for the evaluation of comparisons of reference materials
individually prepared and value-assigned by different organizations to measurements made in a single
laboratory under repeatability measurements. Th ...