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NIST Authors in Bold

Displaying 9426 - 9450 of 9863

A Second-Generation NIST Gravimetric Hygrometer

April 1, 2010
Author(s)
Christopher W. Meyer, Joseph T. Hodges, Gregory E. Scace, James R. Whetstone, R W. Hyland
A second-generation primary hygrometer has been completed at the National Institute of Standards and Technology (NIST). A gravimetric hygrometer measures humidity by separating the water from the carrier gas using desiccants and afterwards independently

Optical Properties of Semiconductors

October 19, 2009
Author(s)
David G. Seiler, Stefan Zollner, Alain C. Diebold, Paul Amirtharaj
Rapid advances in semiconductor manufacturing and associated technologies have increased the need for optical characterization techniques for materials analysis and in-situ monitoring/control applications. Optical measurements have many unique and

Hyperspectral Image Compressive Projection Algorithm

June 1, 2009
Author(s)
Joseph P. Rice, Jorge E. Neira, David W. Allen
We describe a compressive projection algorithm and quantitatively assess its performance when used with a Hyperspectral Image Projector (HIP). The HIP is being developed by NIST for system-level performance testing of hyperspectral and multispectral

Testing and Analysis of Steel Beam-Column Assemblies under Column Removal Scenarios

May 6, 2009
Author(s)
Fahim Sadek, Joseph A. Main, Hai S. Lew, Stephen D. Robert, Vincent Chiarito
This paper presents an experimental and analytical assessment of the performance of steel beam-column assemblies with two types of moment-resisting connections under vertical displacement of a center column, simulating a column removal scenario. The

Structural Behavior of Ceramics

October 16, 2008
Author(s)
Sheldon M. Wiederhorn, Lin-Sien H. Lum
In this chapter, we discussed ceramic materials, materials that by and large do not deform plastically when subjected to high stresses. Consequently, ceramics have a low toughness and are very flaw sensitive. Methods of toughening ceramics involve grain or

Quantifying Interpretability for Motion Imagery: Applications to Image Chain Analysis

July 9, 2007
Author(s)
Charles D. Fenimore, J Irvine, D Cannon, S Israel, G O'Brien, A Aviles, John W. Roberts
The motion imagery community will benefit from the availability of standard measures for assessing image interpretability. The National Imagery Interpretability Rating Scale (NIIRS) has served as a community standard for still imagery, but no comparable

Numerical Fluorescence Correlation Spectroscopy for Molecular Dynamics Analyses Under Non-Standard Conditions

June 1, 2007
Author(s)
Michael J. Culbertson, Joshua T. Williams, Wayland Cheng, Dee A. Stults, Emily R. Wiebrach, John J. Kasianowicz, Daniel L. Burden
A major concern in Fluorescence Correlation Spectroscopy (FCS) pertains to the accuracy of standard mathematical models that are used to extract kinetic information from correlated data. The standard equations used in FCS arise from a simple Gaussian model

Integral Operators and Delay Differential Equations

October 1, 2006
Author(s)
David E. Gilsinn, Florian A. Potra
We begin this expository essay by reviewing with examples what a typical engineer already knows about statistics. We then consider a central question in engineering decision making, i.e., given a computer simulation of high-consequence systems, how do we

Measuring Color Quality of Light Sources

August 17, 2006
Author(s)
Wendy L. Davis, Yoshihiro Ohno
The successful commercialization of solid-state lighting for general illumination will require an effective method to characterize the color quality of these sources. The distinctive spectral characteristics of solid-state lighting sources present both

Measurement of 100 nm and 60 nm Particle Standards by Differential Mobility Analysis

August 1, 2006
Author(s)
George W. Mulholland, Michelle K. Donnelly, Robert C. Hagwood, S R. Kukuck, Vincent A. Hackley, D Y. Pui
The peak particle size and expanded uncertainties (95 % confidence interval) for two new particle calibration standards are measured as 101.60 nm ? 1.02 nm and 60.68 nm ? 0.59 nm. The particle samples are polystyrene spheres suspended in filtered

Relativity and Timing in X-ray Pulsar Navigation

June 5, 2006
Author(s)
Neil Ashby, David A. Howe
XNAV is a technology demonstration that will use photons from X-ray pulsars for navigation and spacecraft attitude determination. This paper summarizes relativistic effects in the context of XNAV. It also characterizes the primary task in the time domain

Fluid Dispensing and Dispersion

May 16, 2006
Author(s)
Jiann C. Yang, David R. Keyser
This paper is a condensed version of a chapter in the forthcoming Next Generation Program (NGP) final report edited by the authors. It summarizes the research conducted during the NGP program on fluid dispensing and dispersion within aircraft engine

Projections Onto Order Simplexes and Isotonic Regression

March 31, 2006
Author(s)
Anthony J. Kearsley
We begin this expository essay by reviewing with examples what a typical engineer already knows about statistics. We then consider a central question in engineering decision making, i.e., given a computer simulation of high-consequence systems, how do we

Mirofluidic Appproach for Rapid Interfacial Tensiometry

February 1, 2006
Author(s)
J Cabral, Steven Hudson
We report a microfluidic instrument to rapidly measure the interfacial tension of multi-component immiscible liquids. The measurement principle rests upon the deformation and retraction dynamics of drops under extensional flow and was implemented in

Toward an Improved Color Rendering Metric

July 13, 2005
Author(s)
Wendy L. Davis, Yoshihiro Ohno
Several aspects of the Color Rendering Index (CRI) are flawed, limiting its usefulness in assessing the color rendering capabilities of LEDs for general illumination. At NIST, we are developing recommendations to modify the CRI that would overcome these
Displaying 9426 - 9450 of 9863
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