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Displaying 6651 - 6675 of 7113

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

The GOES Time Code Service, 1974 - 2004: A Retrospective

February 27, 2005
Author(s)
Michael A. Lombardi, D. W. Hanson
After nearly 30 years of continuous operation, NIST ended its Geostationary Operational Environmental Satellites (GOES) time code service at 0 hours, 0 minutes Coordinated Universal Time (UTC) on January 1, 2005. This event marked the end of an important

Task Analysis of Autonomous On-road Driving

October 28, 2004
Author(s)
Tony Barbera, John A. Horst, Craig I. Schlenoff, David Aha
The Real-time Control System (RCS) Methodology has evolved over a number of years as a technique to capture task knowledge and organize it into a framework conducive to implementation in computer control systems. The fundamental premise of this methodology

Constitutive Models for a Poly(e-caprolactone) Scaffold

October 1, 2004
Author(s)
Timothy P. Quinn, Tammy L. Oreskovic, Christopher N. McCowan, N Washburn
We investigate material models for a porous, polymeric scaffold used for bone. The material was made by co-extruding poly (e-caprolactone) (PCL), a biodegradable polyester, and poly(ethylene oxide)(PEO). The water soluble PEO was removed resulting in a

Task Analysis of Autonomous On-Road Driving

October 1, 2004
Author(s)
Anthony J. Barbera, John A. Horst, Craig I. Schlenoff, David Aha
The Real-time Control System (RCS) Methodology has evolved over a number of years as a technique to capture task knowledge and organize it into a framework conducive to implementation in computer control systems. The fundamental premise of this methodology

High Heat-Flux Sensor Calibration: A Monte Carlo Modeling

July 1, 2004
Author(s)
A V. Murthy, A Prokhorov, D P. DeWitt
Conventional calibration of heat-flux sensors uses high-temperature blackbody radiation, and places the sensors away from the blackbody aperture. This approach limits the achievable calibration heat-flux to about 50 kW/m2. Recent interest in extending the
Displaying 6651 - 6675 of 7113
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