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Journals

The Role of Fundamental Constants in the International System of Units (SI): Present and Future

April 1, 2001

Author(s)

Barry N. Taylor, Peter J. Mohr

This paper addresses the role of fundamental constants in (1) the current definitions of the base units; (2) practical representations of SI electric units and...

Formation of Rydberg Atoms in an Expanding Ultracold Neutral Plasma

April 1, 2001

Author(s)

M J. Lim, T C. Killian, S Kulin, R Dumke, S Bergeson, S L. Rolston

We study the formation of Rydberg atoms in expanding plasmas at temperatures of 1-1000K and densities from 10^5 - 10^10 cm^-3. Up to 20% of the initially free...

Diffraction and Depths-of-Field Effects in Electron Beam Imaging at SURF III

April 1, 2001

Author(s)

Uwe Arp

Imaging an electron beam with visible light is a common method of diagnostics applied to electron accelerators. It is a straightforward way to deduce the...

Electron Self-Energy for the K and L Shells at Low Nuclear Charge

April 1, 2001

Author(s)

U Jentschura, Peter J. Mohr, G Soff

A nonperturbative numerical evaluation of the one-photon electron self energy for the K- and L-shell states of hydrogen like ions with nuclear charge numbers Z...

Dental Resin Composites Containing Silica-Fused Whiskers: Effects of Whisker-to-Silica Ratio on Fracture Toughness and Indentation Properties

April 1, 2001

Author(s)

Hockin D. Xu, Janet Quinn, Douglas T. Smith, Joseph M. Antonucci, Gary E. Schumacher, F Eichmiller

Dental resin composites need to be strengthened in order to improve their performance in large stress-bearing applications such as crowns and multiple-unit...

Boat Conformations Part IV- Synthesis, NMR Spectroscopy, and Molecular Dynamics of Methyl 4,6-O-Benzylidene-3-Deoxy-3-Phthalimido-alpha-D-Altropyranoside Derivatives

April 1, 2001

Author(s)

B Coxon, R C. Reynolds

dition of the elements of phthalimide to methyl 2,3-anhydro-4,6-O-benzylidene-α-D-mannopyranoside (1) under fusion conditions has yielded methyl 4,6-O...

Interferometric measurement of refractive-index change in photosensitive glass

April 1, 2001

Author(s)

Tasshi Dennis, E. M. Gill, Sarah L. Gilbert

We report on a technique for determining the change in the refractive index of photosensitive glass. We have demonstrated our interferometer-based technique on...

Responsivity calibration methods for 365 nm irradiance meters

April 1, 2001

Author(s)

Thomas C. Larason, Steven W. Brown, George P. Eppeldauer, Keith R. Lykke

Thermal Conductivities of Alternatives to CFC-11 for Foam Insulation

April 1, 2001

Author(s)

Richard A. Perkins, L -. Cusco, J -. Howley, Arno R. Laesecke, S -. Matthes, M L. Ramires

The present work examines the thermal conductivities of several dilute vapors which are potential alternatives to chlorofluorocarbons (CFCs) for cellular...

Effects of Water, Salt Solution and Simulated Concrete Pore Solution on the Properties of Composite Matrix Resins Used in Civil Engineering Applications

April 1, 2001

Author(s)

Joannie W. Chin, K Aouadi, M R. Haight, W Hughes, Tinh Nguyen

One of the obstacles hindering the acceptance of polymer composites in civil engineering applications is the susceptibility of the polymeric matrix to...

Absolute Molecular Orientational Distribution of the Polystyrene Surface

April 1, 2001

Author(s)

Kimberly A. Briggman, John C. Stephenson, William E. Wallace, Lee J. Richter

Vibrationally-resonant sum frequency generation (VR-SFG) has been used to study the absolute molecular orientational distribution of the pendant phenyl groups...

Dye Impregnation Method for Revealing Machining Crack Geometry

April 1, 2001

Author(s)

M Kanematsu, M. Sando, Lewis K. Ives, Ryna B. Marinenko, George D. Quinn

Detection and Quantification Capabilities for ⁸⁵Kr with the NIST Low-Level Gas Counting System: Impacts of Instrumental and Environmental Backgrounds

April 1, 2001

Author(s)

Lloyd A. Currie, George A. Klouda

Among the most important, conservative geochemical tracers are the long-lived isotopes of krypton, 81Kr and 85Kr. Following a very brief review of the metrology...

Coincidence and anti-coincidence measurements in prompt gamma neutron activation analysis with pulsed cold neutron beams

April 1, 2001

Author(s)

Rolf L. Zeisler, George P. Lamaze, Huaiyu H. Chen-Mayer

Uptake of oxygen in a coal standard reference material determined by fast (14-MeV) neutron activation analysis

April 1, 2001

Author(s)

W. D. James, Rolf L. Zeisler

A Rare-Earth-Oxide Glass for the Wavelength Calibration of Near-Infrared Dispersive and Fourier-Transform Spectrometers

April 1, 2001

Author(s)

Steven J. Choquette, John C. Travis, L. E. O'Neal, C. J. Zhu, David L. Duewer

Development of Isotope Dilution Cold Vapor Inductively Coupled Plasma Mass Spectrometry and Its Application to the Certification of Mercury in NIST Standard Reference Materials

April 1, 2001

Author(s)

Steven J. Christopher, Stephen E. Long, M. S. Rearick, John D. Fassett

BioEqCalc: A Package for Performing Equilibrium Calculations on Biochemical Reactions

April 1, 2001

Author(s)

D Akers, Robert N. Goldberg

A Mathematica package BioEqCalc.m has been developed for treating complex equilibria in aqueous solutions. The package is geared towards the treatment of...

Effects of Relative Humidity on Moisture-Enhanced Photolysis of Acrylic Melamine Coatings: A Quantitative Study

April 1, 2001

Author(s)

Tinh Nguyen, Jonathan W. Martin, E Byrd, N Embree

The effects of relative humidity ranging from [approximately equal to] 0 % to 90 % on the moisture-enhanced photolysis (MEP) of a partially-methylated melamine...

Kinetics of Formation of Many Armed Stars With Dendrimer Cores as a Model of Crosslinking

April 1, 2001

Author(s)

Barry J. Bauer, B D. Viers

Many armed star molecules were formed by endlinking monofunctional vinyl sulfone endcapped PEG to the terminal amines dendrimers. Gel permeation chromatography...

Analysis of a Dual-Balance HIgh Resistance Bridge at 10 T{Ω}

April 1, 2001

Author(s)

Dean G. Jarrett

The NIST guarded active-arm bridge, using a third dc source and a second detector to balance the guard network, is described. Improvements to the NIST active...

Thermomechanical Oscillations in Material Flow During High-Speed Machining

April 1, 2001

Author(s)

Matthew A. Davies, Timothy J. Burns

This paper presents a nonlinear dynamics approach for predicting the transition from continuous to shear-localized chip formation in machining. Experiments and...

Characterization of Polymer-Clay Solutions by Rheology, Flow Birefringence and SANS

April 1, 2001

Author(s)

Charles C. Han, G Schmidt, A Nakatani, Alamgir Karim

The shear orientation of viscoelastic clay-polymer solutions was investigated by means of rheology, flow birefringence and small-angle neutron scattering (SANS)...

Mass Spectrometry of Spin-On-Glass Low-K Dielectric Precursors

April 1, 2001

Author(s)

William E. Wallace, Kathleen M. Flynn, Joseph M. Antonucci

The degree-of-intramolecular-condensation, defined as the number of residual silanol (SiOH) groups per oligomer, for a variety of silsesquioxane polymers was...

Negative Cesium Sputter Ion Source for Generating Cluster Primary Ion Beams for Secondary Ion Mass Spectrometry Analysis

April 1, 2001

Author(s)

John G. Gillen, R L. King, B Freibaum, R Lareau, J Bennett, F Chmara

The use of a cluster (or polyatomic) primary ion projectile for organic SIMS has been demonstrated to increase the yield of characteristic molecular secondary...

Absolute Quantum Efficiency Measurements Using Correlated Photons: Toward a Measurement Protocol

April 1, 2001

Author(s)

Alan L. Migdall

Correlated photons can be used to measure of the quantum efficiency of photon counting photodetectors without ties to any externally calibrated standards. We...

Stability Measurements on Noise Sources

April 1, 2001

Author(s)

James P. Randa, L. A. Terrell, Lawrence P. Dunleavy

Measurement and Analysis of Results Obtained on Biological Substances With Differential Scanning Calorimetry

April 1, 2001

Author(s)

H J. Hinz, Frederick P. Schwarz

Differential scanning calorimeters (DSCs) have been widely used to determine the thermodynamics of phase transitions and conformational changes in biological...

Identification and Quantification of 8,5'-Cyclo-2'-Deoxyadenosine in DNA by Liquid Chromatography/Mass Spectrometry

April 1, 2001

Author(s)

M. Dizdaroglu, Pawel Jaruga, H Rodriguez

Recent studies suggested that 8,5'-cyclo-2'-deoxyadenosine may play a role in diseases with defective nucleotide-excision repair. This compound is one of the...

Comparative Study of Pore Size of Low-Dielectric-Constant Porous Spin-On-Glass Films Using Different Methods of Nondestructive Instrumentation

April 1, 2001

Author(s)

E Kondoh, M R. Baklanov, Eric K. Lin, D Gidley, A Nakashima

Pore sizes of hydrogen-methyl-siloxane-based porous spin-on-glass (SOG) thin films are comparatively studied with different non-destructive instrumental methods...

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