Journal of Research of the National Institute of Standards and Technology articles from November 2004

Journal of Research of the National Institute of Standards and Technology archives from November 2004

A small-volume apparatus for the measurement of phase equilibria.
November 1, 2004... An apparatus has been designed and constructed for the measurement of vapor-liquid equilibrium properties. The main components of the apparatus consist of an equilibrium cell and a vapor circulation pump. The cell and all of the system valves...

SRM 2460/2461 standard bullets and casings project.
November 1, 2004... The National Institute of Standards and Technology Standard Reference Material (SRM) 2460/2461 standard bullets and casings project will provide support to firearms examiners and to the National Integrated Ballistics Information Network (NIBIN)...

Properties of nanostructured hydroxyapatite prepared by a spray drying technique.
November 1, 2004... In previous studies nano sized hydroxyapatite (HA) particles were prepared by solgel or precipitation methods, in which the products were washed by aqueous or nonaqueous liquids to remove impurities or undesired components. The washing is know...

Preparation and comprehensive characterization of a calcium hydroxyapatite reference material.
November 1, 2004... Numerous biological and chemical studies involve the use of calcium hydroxyapatite (HA), [Ca.sub.10](P[O.sub.4])[.sub.6](OH)[.sub.2]. In this study detailed physicochemical characterization of HA, prepared from an aqueous solution, was carried...

Ambiguities in powder indexing: conjunction of a ternary and binary lattice metric singularity in the cubic system.
November 1, 2004... A lattice metric singularity occurs when unit cells defining two (or more) lattices yield the identical set of unique calculated d-spacings. The existence of such singularities, therefore, has a practical and theoretical impact on the indexing...