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An elementary treatise on calculus of variations (1850) by John H Jellett

By John H Jellett

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A “material of interest” becomes a reference material by being selected and prepared in an appropriate manner: WATTERS ET AL. ON REFERENCE MATERIALS FOR BERYLLIUM ( A material of interest ) ( + ) ( Adequate Preparation (homogeneity, uniformity, etc) = A Reference Material (RM) 31 ) A reference material qualifies as a Certified Reference Material (CRM) when a metrology laboratory (national or commercial) issues a certificate stating that one or more of its property values are certified by a procedure which establishes its traceability to an accurate realization of the unit in which the property values are expressed, and for which each certified value is accompanied by an uncertainty at a stated level of confidence [1].

These are known as Other Agency Reference Materials (OARMs). Under such agreements, the entire lot of materials and the accompanying reports are transferred to the contracting agency. OARMs meet the ISO requirements for CRMs. A NIST Traceable Reference Material (NTRM) is a CRM produced by a commercial supplier with a well defined traceability to the values of standards maintained by NIST. This traceability is established via criteria and protocols defined by NIST that are tailored to meet the needs of the metrological community to be served.

Information Values Certification Modes 4–7 can also result in a NIST information value. Such is the case when the agreement among data from multiple methods is not sufficient to estimate a reliable uncertainty. Information values provide users with supplemental information about the SRM composition. Certified values and reference values have corresponding uncertainties. Information values do not have corresponding uncertainties. 36 BERYLLIUM: SAMPLING AND ANALYSIS Application-Related Issues for Reference Materials Reference Materials for Calibration Reference materials used for the calibration of instruments or analytical methods are, in general, relatively simple mixtures of analytes whose concentrations are very well known.

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