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Search Publications

NIST Authors in Bold

Displaying 42226 - 42250 of 73697

Wall Migration and Shear-Induced Diffusion of Fluid Droplets in Emulsions

January 1, 2003
Author(s)
Steven D. Hudson
The spatial distribution of drops in multiphase flow through narrow passages is analyzed theoretically and experimentally. In simple shear between two plates, drops migrate away from the walls and concentrate towards the center of the gap. At steady state

Wavelength-Shift and Fluorescent Probes for Cure Monitoring of Resins

January 1, 2003
Author(s)
Francis W. Wang, R E. Lowry
The peak frequencies of the absorption and fluorescence spectra of some fluorescent probes dissolved in resins are sensitive ton the polarity and the local viscosity. The peak absorption and fluorescence frequencies of wavelength-shift fluorescent probes

Wear in Boundary Lubrication

January 1, 2003
Author(s)
Stephen M. Hsu, R G. Munro, M C. Shen
Wear studies under lubricated conditions can be classified into two nominally distinct categories: investigations of thewear mechanisms active within the material, and studies of the degradation mechanisms active within the lubricant. Thetwo categories

Wear of Hydroxyapatite Sliding Against Glass-Infiltrated Alumina

January 1, 2003
Author(s)
Sergei Kalinin, B Hockey, S Jahanmir
The present work reports on the processes involved in the wear of hydroxyapatite sliding against slip-cast, glass-infiltrated alumina. Synthetic hydroxyapatite is used as a model material representing tooth enamel, while the alumina that was used is

Wear Transitions and Tribochemical Reactions in Ceramics

January 1, 2003
Author(s)
S Jahanmir
Structural ceramics are used in diverse tribological applications due to their unique properties that include resistance to abrasion and erosion, resistance to corrosive wear, wear resistance at elevated temperatures, low density, and unique electrical

Weibull Strength Scaling for Standardized Rectangular Flexure Specimens

January 1, 2003
Author(s)
George D. Quinn
Formulas for the effective volumes and effective surfaces for rectangular bars loaded in flexure are reviewed. The ratio of strengths from any two configurations, such as 3-point flexural to 4-point, is independent of whether the flaws are volume or

Workshop Summary Report: Scanning Probe Nanolithography Workshop

January 1, 2003
Author(s)
John A. Dagata, H Yokoyama, F Perez-murano
A workshop on Scanning Probe Microscope (SPM)-based Nanolithography was held at NIST Gaithersburg on November 24-25, 2003. The meeting was sponsored by the Precision Engineering Division, Manufacturing Engineering Laboratory, NIST, under a Research

X-ray diffraction, photoluminescence and composition standards of compound semiconductors

January 1, 2003
Author(s)
Alexana Roshko, Kristine A. Bertness, J T. Armstrong, Ryna B. Marinenko, Marc L. Salit, Lawrence H. Robins, Albert J. Paul, R J. Matyi
Work is underway to develop composition standards and standardized assessment procedures for compound semiconductors. An AlGaAs composition standard with less than 2% uncertainty is being developed. The improved accuracy of this standard is being achieved

X-ray Transition Energies (version 1.0)

January 1, 2003
Author(s)
R Deslattes, E G. Kessler, Paul Indelicato, L de Billy, E Lindroth, J Anton, J S. Coursey, D J. Schwab, Karen J. Olsen, Robert A. Dragoset

X-Ray Transition Energies: New Approach to a Comprehensive Evaluation

January 1, 2003
Author(s)
R Deslattes, Ernest G. Kessler, Paul Indelicato, L de Billy, E Lindroth, J Anton
The authors combine modern theoretical calculations with evaluated selected experimental data to produce a comprehensive data resource of K- and L-x-ray transition and absorption edge energies for all of the elements from neon to fermium. The theoretical

A Well Dressed Microscope: Practical Experience with Microcalorimeter and Silicon Drift Detector Systems

December 31, 2002
Author(s)
John A. Small, Dale Newbury, John Henry J. Scott, L. King, Sae Woo Nam, Kent D. Irwin, Steven Deiker, Shaul Barkan, Jan Iwanczyk
NIST, Gaithersburg has recently installed a first generation silicon drift detector (SDD) from Photon Imaging and the NIST Boulder microcalorimeter energy dispersive x-ray spectrometer (υcal-EDS) on a JEOL 840 SEM, as shown in Fig. 1. [1,2] The instrument

Characterization of Linear and Branched Polyethylenimine (PEI) by ESI-MS and MALDI-TOF-MS

December 31, 2002
Author(s)
Kathleen M. Flynn, M Konaklieva, J P. Gu, Charles M. Guttman, S Wetzel
Polyethylenimine (PEI) is being used as a DNA transfection agent. Complexes of DNA and PEI are known to pass through the wall of a cell, and studies have reported that PEI s efficiency as a gene delivery vehicle depends on its molecular weight. Molecular

Distributed Testing of an Equipment-Level Interface Specification

December 31, 2002
Author(s)
Joseph Falco, John A. Horst, Hui-Min Huang, Thomas Kramer, Frederick M. Proctor, Keith A. Stouffer, Albert J. Wavering
A test suite for an key interface within a dimensional measuring system (coordinate measuring machine or CMM) is presented. The test suite consists of test procedures, test definitions, and various testing utilities. A real-time, distributed test utilizing
Displaying 42226 - 42250 of 73697
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