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

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

The remarkable metrological history of radiocarbon dating [II].
March 1, 2004... This article traces the metrological history of radiocarbon, from the initial breakthrough devised by Libby, to minor (evolutionary) and major (revolutionary) advances that have brought [.sup.14]C measurement from a crude, bulk [8 g carbon]...

Characterization of combinatorial polymer blend composition gradients by FTIR microspectroscopy.
March 1, 2004... A new FTIR technique was developed for characterizing thin polymer films used in combinatorial materials science. Fourier transform infrared microspectroscopy mapping technique was used to determine the composition of polymer blend gradients....

Spot weld analysis with 2D ultrasonic arrays.
March 1, 2004... This paper describes a threefold method of testing the performance of an array-based ultrasonic tool for nondestructive testing of spot welds. The tool is described in its capabilities, use, and advantages over existing counterparts....

Standard Reference Materials (SRMs) for the calibration and validation of analytical methods for PCBs (as Aroclor mixtures).
March 1, 2004... Six Standard Reference Materials (SRMs[R]) have been prepared by the National Institute of Standards and Technology (NIST) for the determination of PCBs as different Aroclor mixtures in methanol. Six additional SRMs of the same Aroclors in...

Simulation of sheared suspensions with a parallel implementation of QDPD.
March 1, 2004... A parallel quaternion-based dissipative particle dynamics (QDPD) program has been developed in Fortran to study the flow properties of complex fluids subject to shear. The parallelization allows for simulations of greater size and complexity...

Software architecture for a Virtual Environment for Nano Scale Assembly (VENSA).
March 1, 2004... A Virtual Environment (VE) uses multiple computer-generated media to let a user experience situations that are temporally and spatially prohibiting. The information flow between the user and the VE is bidirectional and the user can influence...

Intramural comparison of NIST laser and optical fiber power calibrations.
March 1, 2004... The responsivity of two optical detectors was determined by the method of direct substitution in four different NIST measurement facilities. The measurements were intended to demonstrate the determination of absolute responsivity as provided by...

Erratum: statistical interpretation of key comparison reference value and degrees of equivalence.(Errata)(Correction Notice)
March 1, 2004... R. N. Kacker, R. U. Datla, and A. C. Parr National Institute of Standards and Technology, Gaithersburg, MD 20899-0001, USA [J. Res. Natl. Inst. Stand. Technol. Volume 108, Number 6, November-December 2003, p. 439] On page 444,...

Erratum: new national Air-Kerma-Strength standards for [.sup.125]I and [.sup.103]Pd brachytherapy seeds.(Errata)(Correction Notice)
March 1, 2004... Stephen M. Seltzer, Paul J. Lamperti, Robert Loevinger, Michael G. Mitch, James T. Weaver, and Bert M. Coursey National Institute of Standards and Technology, Gaithersburg, MD 20899-0001. [J. Res. Natl. Inst. Stand. Technol. Volume...

Erratum: determining the magnetic properties of 1 kg mass standards.(Errata)(Correction Notice)
March 1, 2004... Richard S. Davis Bureau International des Poids et Mesures, Pavillon de Breteuil, F-92312 Sevres Cedex, France [J. Res. Natl. Inst. Stand. Technol. Volume 100, Number 3, May-June 1995, p. 209] Page 211, above Eq. (3) Replace...