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Search Publications

NIST Authors in Bold

Displaying 40251 - 40275 of 73960

Measurement of Heat Conduction Through Bonded Regenerator Matrix Materials

December 1, 2003
Author(s)
Michael A. Lewis, Ray Radebaugh
Regenerative heat exchangers have had a significant influence on the development of small refrigerators for cryogenic applications. The optimized design of these regenerators takes into account the axial thermal conduction of the matrix. Until recently

Modeling Fire Growth and Spread in Houses. (Abstract/Presentation/Visuals)

December 1, 2003
Author(s)
Kevin B. McGrattan
In cooperation with the fire protection engineering community, a numerical fire model, Fire Dynamics Simulator (FDS), is being developed at NIST to study fire behavior and to evaluate the performance of fire protection systems in buildings. Version 1 of

Molecular Dynamics Study of the Solubility of Oxygen in Liquid Pyridine

December 1, 2003
Author(s)
Raymond D. Mountain
The solubility of oxygen in liquid pyridine is estimated using molecular dynamics to evaluate the chemical potential of the gas molecule in the liquid. The Kirkwood charging method is used with empirical potentials that generate reliable equations of state

Multimodal Biometric Authentication Methods: A COTS Approach

December 1, 2003
Author(s)
Michael D. Indovina, Robert D. Snelick, Alan Mink
We examine the performance of multimodal biometric authentication systems using state-of-the-art Commercial Off-the-Shelf (COTS) fingerprint and face biometrics on a population approaching 1000 individuals. Prior studies of multimodal biometrics have been

Near Edge X-Ray Absorption Fine Structure Measurements of the Interface Between Bottom Anti-Reflective Coatings and a Model Deprotected Photoresist

December 1, 2003
Author(s)
E Jablonski, S Sambasivan, Daniel A. Fischer, Eric K. Lin, C Devadoss, R Puligadda
The interface between bottom anti-reflective coatings (BARCs) and a model deprotected photoresist, poly(4-hydroxystyrene) (PHS), was investigated using near edge x-ray absorption fine structure spectroscopy to identify mechanisms responsible for pattern

NIST 3 Megawatt Quantitative Heat Release Rate Facility (NIST SP 1007)

December 1, 2003
Author(s)
Rodney A. Bryant, Thomas J. Ohlemiller, Erik L. Johnsson, Anthony P. Hamins, B S. Grove, William F. Guthrie, Alexander Maranghides, George W. Mulholland
The 3 Megawatt Heat Release Rate Facility was developed at NIST as a first step toward having broad capabilities for making quantitative large scale fire measurements. Such capabilities will be used at NIST to validate fire models and to develop sub-grid

Nitrogen-Activated Bowing of Dilute In y Ga 1-y As 1- x N x Based on Photoreflectance Studies

December 1, 2003
Author(s)
M M. Fahmi, A Kahn, J A. Griffin, G L. Harris, Larry Robins, Anthony G. Birdwell, Youn S. Kang, D J. Smith, T Steiner, S N. Mohammad
The dependence of the fundamental band gap and higher-lying critical-point energies of dilute-nitrogen Ga 1-yIn yAs 1-xN x epilayers on nitrogen mole fraction (x), for x less than or equal to} 0.0125, and temperature, from 20 K to 295 K, was investigated

Nonlinear Microwave Response of MgB 2 Thin Films

December 1, 2003
Author(s)
James C. Booth, Kenneth Leong, S. Y. Lee, J. H. Lee, B. Oh, H. N. Lee, S. H. Moon
Thin films of the newly discovered superconductor MgB 2 show promise for a number of different electronic applications. In order to evaluate the suitability of this new material for communication applications at microwave frequencies, we have measured both

Novel Microstructure in Polymer Blends Sheared Under Confinement

December 1, 2003
Author(s)
Jai A. Pathak, Kalman D. Migler
In this review article, we discuss the implications for the morphology of an immiscible polymer blend, or in general, an emulsion, in the limit when the two length scales, viz., the average droplet size and characteristic experimental length scale, become

Numerical Model of Bubbling Thermoplastics. (Abstract/Presentation)

December 1, 2003
Author(s)
Kathryn M. Butler
Thermoplastic materials such as polypropylene (PP), polyethylene (PE), and polystyrene (PS) are widely used in household furnishings, and therefore constitute a large fraction of the fuel load during a fire. The combustible gases generated during polymer

Orientation of Platelets in Multilayered Nanocomposite Polymer Films

December 1, 2003
Author(s)
M M. Malwitz, Sheng Lin-Gibson, Erik K. Hobbie, Paul Butler, G Schmidt
The orientation of platelets in micron thick polymer-clay nanocomposite films was investigated by means of small-angle neutron scattering (SANS), small angle X-ray scattering (SAXS) and wide-angle X-ray diffraction (WAXD). The films with various clay

Passively Mode-locked Glass Waveguide Laser with 14 fs Timing Jitter

December 1, 2003
Author(s)
John B. Schlager, Berton Callicoatt, Richard Mirin, Norman Sanford, David J. Jones, Jun Ye
Ultra-low jitter pulse trains are produced from a passively mode-locked erbium/ytterbium co-doped planar waveguide laser using high-bandwidth feedback control acting on the physical cavity length and optical pump power. Synchronization of a 750 MHz

Performance of Home Smoke Alarms, Analysis of the Response of Several Available Technologies in Residential Fire Settings.

December 1, 2003
Author(s)
Richard W. Bukowski, Richard D. Peacock, Jason D. Averill, Thomas G. Cleary, Nelson P. Bryner, Paul A. Reneke
This report presents the results of the project and provides details of the response of a range of residential smoke alarm technologies in a controlled laboratory test and in a series of real-scale tests conducted in two different residential structures

Polarized Light Diffusely Scattered Under Smooth and Rough Interfaces

December 1, 2003
Author(s)
Thomas A. Germer
We develop models for light scattering appropriate for glossy and matte paints. Volume scattering is treated in the single scattering regime and the diffusive scattering regime. In the single scattering regime, scattering is treated in the Rayleigh-Gans

Potential Energy Surface Database of Group II Dimer Molecules

December 1, 2003
Author(s)
Svetlana A. Kotochigova, Paul S. Julienne
The purpose of this work is to provide critical atomic and molecular data needed in order to evaluate the feasibility of using laser cooled and trapped Group II atomic species (Mg, Ca, Sr, and Ba) and Yb for ultra-precise optical clocks or quantum

Properties of Elastomeric Calcium Phosphate Cement-Chitosan Composites

December 1, 2003
Author(s)
Shozo Takagi, Laurence C. Chow, S Hirayama, F Eichmiller
Self-hardening calcium phosphate cements (CPC) have been shown to be efficacious in a number of clinical applications for which other currently available materials do not work well. However, for some applications, for example in filling periodontal defects

Pump-Wavelength Dependence of Raman Gain in Single-Mode Optical Fibers

December 1, 2003
Author(s)
Nathan R. Newbury
The magnitude of the stimulated Raman gain spectrum will depend on the absolute wavelength of the pump laser. For many fibers, this dependence can be cast as a simple scaling of the overall gain curve according to a power-law dependence on the pump

QCSim, Quantum Computation Simulator

December 1, 2003
Author(s)
Paul E. Black
The goal of this document is to help W3C editors write better specifications, by making a specification easier to interpret without ambiguity and clearer as to what is required in order to conform. It focuses on how to define and specify conformance. It
Displaying 40251 - 40275 of 73960
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