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Search Publications

NIST Authors in Bold

Displaying 41226 - 41250 of 73697

Dielectric Permittivity of Eight Gases Measured with Cross Capacitors

March 1, 2003
Author(s)
James W. Schmidt, Michael R. Moldover
A 4-ring, toroidal cross capacitor was used to measure accurately the relative dielectric permittivity ε(p,T) of He, Ar, N 2, O 2, CH 4, C 2H 6, C 3H 8, and CO 2. (ε is often called the dielectric constant. ) The data are in the range from 0 C to 50 C and

Effect of Caged Fluorescent Dye on the Electroosmotic Mobility in Microchannels

March 1, 2003
Author(s)
David J. Ross, Laurie E. Locascio
We report on measurements of electroosmotic mobility in polymer microchannels and silica capillaries with and without the addition of a caged fluorescein dye to the buffer. For PMMA microchannels, the mobility was found to increase from (2.6 0.1) 10-4 cm2

Electron Backscatter Diffraction for Studies of Localized Deformation

March 1, 2003
Author(s)
R.H. Geiss, Alexana Roshko, Kristine A. Bertness, T Keller
Electron backscatter diffraction (EBSD) was used to study localized deformation in two types of constrained-volume materials. We present a study of deformation in narrow aluminum interconnects after low frequency, AC cycling at high current density. Joule

Embedded Capacitance Materials and Their Application in High Speed Designs

March 1, 2003
Author(s)
T Bergstresser, R Hilburn, Jan Obrzut, K. M. Phillips
In this paper, we review three material options for embedded capacitors: thin FR4 epoxy-glass laminate, adhesiveless copper on polyimide substrate, and unsupported epoxy filled with high dielectric constant ceramic powder. Characteristics including

Estimation of Q-factors and Resonant Factors

March 1, 2003
Author(s)
Kevin Coakley, Jolene Splett, Michael D. Janezic, Raian K. Kaiser
We estimate the quality factor Q and resonant frequency f 0 of a microwave cavity based on resonance curve observations on an equally-spaced frequency grid. The observed resonance curve is the squared magnitude of an observed complex scattering parameter

Estimation of Q-Factors and Resonant Frequencies

March 1, 2003
Author(s)
Kevin J. Coakley, Jolene D. Splett, Michael D. Janezic, R F. Kaiser
We estimate the quality factor Q and resonant frequency f o of a microwave cavity based on resonance curve observations on an equally-spaced frequency grid. The observed resonance curve is the squared magnitude of an observed complex scattering parameter

Expected Multi-Hop Power Consumption in Mobile Ad-Hoc Networks

March 1, 2003
Author(s)
Camillo A. Gentile
Mobile Ad-Hoc Networks provide the means to reduce significantly the power required for routing from source to destination through multi-hops between other nodes in the network. In the presence of mobility, only continuous updating can guarantee routes

Exploring and Extending the Limits of CD-SEMs' Resolution

March 1, 2003
Author(s)
Andras Vladar, Michael T. Postek, John S. Villarrubia
This study of SEM resolution is occasioned by concerns that it is no longer adequate for lithography process control in integrated circuit manufacturing. For example, according to the most recent International Technology Roadmap for Semiconductors, the in

Face Recognition Vendor Test 2002 Performance Metrics

March 1, 2003
Author(s)
Patrick Grother, Ross J. Micheals, P. Jonathon Phillips
We present the methodology and recognition performance characteristics used in the Face Recognition Vendor Test 2002. We refine the notion of a biometric imposter, and show that the traditional measures of identification and verification performance are

Face Recognition Vendor Test 2002: Evaluation Report

March 1, 2003
Author(s)
P J. Phillips, Patrick J. Grother, Ross J. Micheals, D M. Blackburn, Elham Tabassi, M Bone
The Face Recognition Vendor Test (FRVT) 2002 is an independently administered technology evaluation of mature face recognition systems. FRVT 2002 provides performance measures for assessing the capability of face recognition systems to meet requirement for

Flame Heights and Heat Release Rates of 1991 Kuwait Oil Field Fires (NIST SP 995)

March 1, 2003
Author(s)
D. D. Evans, Daniel M. Madrzykowski, G A. Haynes
A series of measurements were made in the Al Mawqa/Al Ahmadi oil field region of Kuwait to explore the feasibility of assessing the heat release rate of individual well fires through flame height and thermal radiation measurements. The heat release rate

Flexible and Rapidly Configurable Femtosecond Pulse Generation in the Mid-IR

March 1, 2003
Author(s)
S M. Foreman, D J. Jones, Jun Ye
We demonstrate a new experimental approach for flexible femtosecond pulse generation in the mid-IR using difference-frequency-generation from two tightly synchronized Ti: sapphire lasers. The resultant mid-IR pulse train can be easily tuned, with an

Ignition of Weathered and Emulsified Oils (NIST SP 995)

March 1, 2003
Author(s)
Anthony D. Putorti Jr., D D. Evans, E J. Tennyson
In situ burning of oil spills has been shown to be a rapid means of removing oil from the water surface. Although fresh oil is usually easily ignited, the ability to ignite weathered oils and water-in-oil emulsions is less certain. This paper presents

In Situ Burning of Oil Spills: Mesoscale Experiments and Analysis (NIST SP 995)

March 1, 2003
Author(s)
William D. Walton, D. D. Evans, Kevin B. McGrattan, Howard R. Baum, W H. Twilley, Daniel M. Madrzykowski, Anthony D. Putorti Jr., Ronald G. Rehm, H Koseki, E J. Tennyson
A series of six mesoscale and one large laboratory fire experiments were performed to measure the burning characteristics of Louisiana crude oil on water in a pan. These included one - 6 m square and five - 15 m square mesoscale burns and one - 1.2 m

In Situ TEM Observations of Fracture in Nanolaminated Metallic Thin Films

March 1, 2003
Author(s)
Timothy J. Foecke, D E. Kramer
Fracture of single crystal nanolaminted thin films has been investigated through in situ straining of cross-sectional samples of Cu/Ni nanolaminates grown on Cu (001) single crystal substrates. The earliest stages of deformation exhibits a confined layer
Displaying 41226 - 41250 of 73697
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