certification; electron microprobe; microanalysis standards; microhomogeneity; microheterogeneity; standard reference materials for microanalysis
The National Institute of Standards and Technology (NIST) has been involved in the development of standards for microanalysis since the middle of the 1960s. Certification of "traceable" standards that can be sold to other laboratories is...
Dipole; gas; intermolecular potential function; polar; second virial coefficient; Stockmayer
Expressions are developed for the second virial coefficient and its first two temperature derivatives for polar molecules on the Stockmayer model of a dipole imbedded in a spherical core. In the case considered, the core molecules interact...
critical current; degradation; high temperature superconductors; interlaboratory comparison; repeatability; standard method; variability
An extensive interlaboratory comparison was conducted on high temperature superconductor (HTS) critical-current measurements. This study was part of an international cooperative effort through the Versailles Project on Advanced Materials and...
copper-gold alloy; electron probe microanalysis; metallography; NBS Standard Reference Material 482; oxide inclusions; sample preparation; secondary ion mass spectrometry
Copper oxide has been detected in the copper containing alloys of NBS Standard Reference Material (SRM) 482. This occurrence is significant because it represents heterogeneity within a standard reference material that was certified to be...
A torsion creep theory for noncircular tubes was developed by applying a multiaxial creep theory to a derived generalization of Bredt's equations. A review of the literature revealed no torsion creep data on noncircular tubes. Hence, to evaluate...
homogeneity of tissue samples; quality control tissue samples; representative tissue samples; tissue analysis; tissue sample size; tissue trace element data base; trace element analysis.
In the chemical analyses of tissues for trace elements, quality control of the tissue sample for its anatomic composition is a critically important step that is frequently overlooked. This is because the analyst often assumes a degree of...
This paper describes the development of Standard Reference Material, SRM 2694, "Simulated Rainwater," intended to aid in the analysis of acidic rainfall. Details of the formulation and preparation of the two levels of solutions (2694-I and 2694-II)...
