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NIST Authors in Bold

Displaying 44526 - 44550 of 73461

Luminous Intensity of LEDs at NIST

October 1, 2001
Author(s)
Carl C. Miller, Yoshihiro Ohno
Calibration facilities and procedures for measurement of Averaged LED intensity using the detector-based method have been developed at the National Institute of Standards and Technology (NIST). The scale has been established on two standard photometers

Modeling the Appearance of Special Effect Pigment Coatings

October 1, 2001
Author(s)
Thomas A. Germer, Maria E. Nadal
Metallic and pearlescent coatings are becoming increasingly important in automotive, currency, and cosmetic applications. These coatings consist of metallic or dielectric platelets suspended in a binder, and are often applied between a pigmented underlayer

Molecular Dynamics Study of Partial Monolayer Ordering of Chain Molecules

October 1, 2001
Author(s)
Raymond D. Mountain, Joseph B. Hubbard, Curtis W. Meuse, V Simmons
We present the results of a molecular dynamics study of a partial monolayer of self-assembled octadecanethiol molecules. The correlations between various statistical measures of surface induced chain ordering are examined. These include the density profile

Multispectral Probes for Materials and Chemical Analysis

October 1, 2001
Author(s)
Steven A. Buntin
High throughput experimentation is currently restricted by its limited ability to evaluate more than one parameter of a library at a time (e.g., chemical composition, dielectric constant, refractive index, surface roughness, phase , luminescence). When

Noise Characterization of Multiport Amplifiers

October 1, 2001
Author(s)
James P. Randa
I address the issue of the definition and measurement of noise figure and parameters to characterize multiport devices, particularly differential amplifiers. A parameterization in terms of the noise matrix appears to be the most practical. the noise figure

On the Validity of the Adiabatic Spreading Assumption in Droplet Impact Cooling

October 1, 2001
Author(s)
William M. Healy, J G. Hartley, S I. Abdel-Khalik
The effect of heat transfer on the spreading of a water droplet impacting a heated surface has been numerically investigated. The aim is to assess the validity of commonly made assumptions in spray cooling models which ignore heat transfer during the

Optical Frequency Synthesis Based on Mode-Locked Lasers

October 1, 2001
Author(s)
Steven T. Cundiff, J Ye, John L. Hall
The synthesis of optical frequencies from the primary cesium microwave standard has traditionally been a difficult problem due to the large disparity in frequency, Recently this field has been dramatically advanced by the introduction and use of mode

Report on the Second Modes of Operation Workshop

October 1, 2001
Author(s)
Morris J. Dworkin
NIST sponsored a public workshop for the analysis of block cipher modes of operation on August 24, 2001, in Goleta, California. This report summarizes the presentations and discussions at that workshop.

Role of Flaw Statistics in Contact Fracture of Brittle Coatings

October 1, 2001
Author(s)
P Miranda, Antonia Pajares, F Guiberteau, F Cumbrera, Brian R. Lawn
A flaw statistics analysis is here developed to account for systematic differences between experimentally observed and theoretically predicted critical loads for the initiation of contact-induced radial cracks in brittle coatings on compliant substrates

Scheme to Calculate Core Hole-Electron Interactions in Solids

October 1, 2001
Author(s)
J A. Soininen, Eric L. Shirley
We present a first-principles scheme for calculating a core-hole potential for core electron excitations. The scheme incorporates atomic and solid-state screening in the description of core excitations in several materials.We compare the results calculated

Self-Energy Screening in Two-Electron Ions

October 1, 2001
Author(s)
Paul Indelicato, Peter Mohr
The self-energy screening correction to the Coulomb part of the electron-electron interaction (self-energy screening) is evaluated. We consider only the monopole term, which is the only one present in many cases, and the direct term. We evaluate the energy

Separation of Scales for Growth of an Alloy Needle Crystal

October 1, 2001
Author(s)
R F. Sekerka, Sam R. Coriell, Geoffrey B. McFadden
We reexamine the problem of a needle crystal (a model for a dendrite primary stalk) having the shape of a paraboloid of revolution growing at constant velocity from a supercooled binary alloy with given bulk concentration and far-field temperature. The

Single Pulse Shock Tube

October 1, 2001
Author(s)
Wing Tsang, A. Lifshitz
This chapter is concerned with the use of the single pulse shock tube for studying the mechanisms and rate constants for the decomposition of polyatomic molecules at elevated temperatures. It begins with a discussion of the technique. The requirements and

Some Developments at NIST on Traceability in Dimensional Measurements

October 1, 2001
Author(s)
Dennis A. Swyt, Steven D. Phillips, J Palmateer
This paper reports to the international community on recent developments in technical ;policies, programs, and capabilities at the U.S. National Institute of Standards and Technology (NIST) related to traceability in dimensional measurements. These

Standards for Reliability Testing of Heavy Vehicle

October 1, 2001
Author(s)
S Jahanmir, James F. Kelly, William E. Luecke
The objective of this project is to develop international standard test methods for assessing the reliability of ceramic components used in diesel engines and other heavy vehicle propulsion systems. Advanced ceramics such as silicon nitrides offer unique

Statistical Process Monitoring for Autocorrelated Data

October 1, 2001
Author(s)
Nien F. Zhang
In the past years statistical process methodologies have been widely used in industry for process monitoring. However, the assumption that the process data are statistically independent is often invalid. This article discusses the approaches to deal with

Structural Control of Elastic Constants of Mullite in Comparison to Sillimanite

October 1, 2001
Author(s)
B Hildmann, H M. Ledbetter, Sung Kim, H A. Schneider
The nine elastic stiffness coefficients C, of a mulitte single crystal (2Al 2O 3.SiO 2) were measured using Acoustic Resonance Spectroscopy (ARS). The obtained values are similar to those of the structurally related alumino-silicate phase sillimanite (Al
Displaying 44526 - 44550 of 73461
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