Issued September 2003Certain commercial equipment, instruments, or materials are identified in this paper in order to specify the experimental procedure adequately. Such identification is not intended to imply recommendation or endorsement by the National Institute of Standards and Technology, nor

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of the adopted val-ues from the four most recent evalua-tions, (4500 8) d, where 8 d corresponds to one standard uncertainty. Key words: evaluation; half-life; hydro-gen-3; review; tritium.

Standard reference materials within the European Community are developed by the "Bureau Communautaire de Reference. " The development of reference materials for the measurements of steady-state thermal transmission properties was started in 1975 with two candidates: a high-density resin

Issued November 2003Certain commercial equipment, instruments, or materials are identified in this paper in order to specify the experimental procedure adequately. Such identification is not intended to imply recommendation or endorsement by the National Institute of Standards and Technology, nor

materials produced in quantity and certified for one or more physical or chemical properties. They are issued under the NIST trademark and are characterized using state-of-the-art measurement methods. SRMs are designed to ensure the accuracy, traceability, and compatibility of measurement results

. An additional component of chemical measurement which directly influences accuracy is the purity of the standards ici reagents employed. The standard reference materials program of the National Bureau of Standards provides a central source of guaranteed high-purity reference materials which are available to all

on a MOM 1500 D Q-derivatograph. The plot heat of transformation by DSC vs. DTA peak area is advanced as a calibration line for the approximate estimation of quantitative DTA effects. The substances studied will be certified as temperature standard reference materials for use in DTA and DSC

This Standard Reference Material (SRM) is intended for use in evaluating methods of phase abundance analysis of major phases in cement clinkers: the percentages of alite (C3S) 1, belite 2 (β-C2S), aluminate (C3A), ferrite (C4AF), and arcanite (K S). Each unit consists of three hermetically

This Standard Reference Material (SRM) is intended for use in evaluating methods of phase abundance analysis of major phases in cement clinkers: the percentages of alite (C3S) 1, belite 2 (β-C2S), aluminate (C3A), ferrite (C4AF), and arcanite (K S). Each unit consists of three hermetically