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Displaying 28951 - 28975 of 73830

Fire Fighting Tactics under Wind Driven Conditions: Laboratory Experiments

January 21, 2009
Author(s)
Daniel M. Madrzykowski, Stephen Kerber
Eight full scale experiments were conducted to examine the impact of wind on fire spread through a multi-room structure and examine the capabilities of wind control devices (WCD) and externally applied water streams to mitigate the hazard. The principle

Information Technology Laboratory Brochure

January 21, 2009
Author(s)
Elizabeth B. Lennon
This brochure describes the Information Technology Laboratory (ITL) at NIST, including mission, core competencies, resources, products, and customers. It details ITL's eight programs and concludes with contact information.

Simple Connections in Alkali Adsorption

January 21, 2009
Author(s)
John William Gadzuk
Stimulated by recent two-photon photoemission spectroscopy and density functional theory (DFT) studies by Petek and coworkers, a retrospective look at some fundamentals in the theory of ionic alkali adsorption on metal surfaces is presented that provides a

Thermal Decomposition Kinetics of Propylcyclohexane

January 21, 2009
Author(s)
Jason A. Widegren, Thomas J. Bruno
As part of a large-scale thermophysical property measurement project, the decomposition kinetics of propylcyclohexane was investigated. Decomposition reactions were performed at 375, 400, 425, and 450 °C in stainless steel ampoule reactors. At each

Introducing "Insecure IT"

January 20, 2009
Author(s)
David R. Kuhn, Hart Rossman, Simon Liu
This article introduces a new department for IT Professional that will cover security in IT systems, ranging from desktops to global e-commerce networks. Our goal is to offer ideas to improve IT security, both by looking at ways it can go wrong as well as

Properties of Smoke from Overheated Materials in Low-Gravity

January 20, 2009
Author(s)
David L. Urban, Gary A. Ruff, Thomas Cleary, Jiann Yang, George Mulholland, Zeng-guang Yuan
Smoke particle size measurements were obtained under low-gravity conditions by overheating several materials typical of those found in spacecraft. The measurements included integral measurements of the smoke particles and physical sample of the particles

TRC Thermodynamic Tables, Non-Hydrocarbon Supplement NH-100 (December 2008)

January 20, 2009
Author(s)
Michael D. Frenkel
1. Table 23-2-1-(1.10212)-db: Page db-5096.0 New table for 2-hexanol containing the density for the real fluid at selected temperatures and pressures. 2. Table 23-2-1-(1.16010)-db: Pages db-5852.0 and db-5852.1 New table for dimethyl carbonate containing

Dimensional measurement traceability of 3D imaging data

January 19, 2009
Author(s)
Steven D. Phillips, Craig M. Shakarji, Michael Krystek, K Summerhays
This paper discusses the concept of metrological traceability to the SI unit of length, the meter. We describe how metrological traceability is realized, give a recent example of the standardization of laser trackers, and discuss progress and challenges to

Target Penetration of Laser-Based 3D Imaging Systems

January 19, 2009
Author(s)
Geraldine S. Cheok, Kamel S. Saidi, Marek Franaszek
The ASTM E57.02 Test Methods Subcommittee is developing a test method to evaluate the ranging performance of a 3D imaging system. The test method will involve either measuring the distance between two targets or between an instrument and a target. The

Predicting Failure in Mammalian Enamel

January 16, 2009
Author(s)
Brian R. Lawn, James J. Lee, Paul Constantino, Peter Lucas
Dentition is a vital element of human and animal function, yet there is little fundamental knowledge about how tooth enamel endures under stringent oral conditions. This paper describes a novel approach to the issue. Model glass dome specimens fabricated

Bifurcations, Center Manifolds, and Periodic Solutions

January 15, 2009
Author(s)
David E. Gilsinn
Nonlinear time delay differential equations are well known to have arisen in models in physiology, biology, and population dynamics. They have also arisen in models of metal cutting processes. Machine tool chatter, from a process called regenerative

Creating a supersolid in one-dimensional Bose mixtures

January 15, 2009
Author(s)
Ludwig G. Mathey, Ippei Danshita, Charles W. Clark
We identify a one-dimensional supersolid phase in a binary mixture of near-hardcore bosons with weak, local interspecies repulsion. We find realistic conditions under which such a phase, defined here as the coexistence of quasi-superfluidity and quasi

Living Anionic Polymerization Using a Microfluidic Reactor

January 15, 2009
Author(s)
Thomas Q. Chastek, Kazunori Iida, Eric J. Amis, Michael J. Fasolka, Kathryn L. Beers, Jae H. Chun
Living anionic polymerizations were conducted within aluminum-polyimide microfluidic devices. Polymerizations of styrene in cyclohexane were carried out at various conditions, including elevated temperature (60 °C) and high monomer concentration (42 %, by

Reference Correlations for Thermophysical Properties of Liquid Water at 0.1 MPa

January 15, 2009
Author(s)
Jan Hruby, Jaroslav Patek, Jaroslav Klomfar, Monika Souckova, Allan H. Harvey
Simple but highly accurate correlations have been developed for the thermodynamic properties, viscosity, thermal conductivity, and static dielectric constant of liquid water as a function of temperature at a pressure of 0.1 MPa. The temperature range

Selected Impacts of Documentary Standards Supported by NIST

January 15, 2009
Author(s)
Erik Puskar
This report reflects the results of a survey that canvassed the National Institute of Standards and Technology s (NIST) Operating Units (OUs) for instances where NIST has played an active role in the development or implementation of documentary standards

Capillary Rise between Planar Surfaces

January 14, 2009
Author(s)
Jeffrey W. Bullard, Edward J. Garboczi
Minimization of free energy is used to calculate the equilibrium verticalrise and mensicus shape of a liquid column between two closelyspaced, parallel planar surfaces that are inert and immobile. States of minimum free energy are found using standard

Equilibrium Electrostatics of Responsive Polyelectrolyte Monolayers

January 14, 2009
Author(s)
Rebecca A. Zangmeister, Rastislav Levicky, Kang Wang
The physical behavior of polyelectrolytes at solid-liquid interfaces presents challenges both in measurement and in interpretation. An informative, yet often overlooked, property that characterizes the equilibrium organization of these systems is their

Miniature atomic magnetometer integrated with flux concentrators

January 14, 2009
Author(s)
William C. Griffith, Ricardo Jimenez Martinez, Vishal Shah, Svenja A. Knappe, John E. Kitching
A major limitation on the sensitivity of alkali atomic magnetometers, spin-exchange relaxation, can be completely eliminated by operating at low magnetic field and high alkali density. This allows the miniaturization of atomic magnetometers while retaining

Miniature atomic magnetometer integrated with flux concentrators

January 14, 2009
Author(s)
William C. Griffith, Svenja A. Knappe, John E. Kitching, Ricardo Jimenez Martinez, Vishal Shah
High permeability magnetic flux concentrators are used to enhance the sensitivity of an atomic magnetometer operating in the spin exchange relaxation free regime. The magnetometer uses a millimeter scale 87Rb vapor cell and either mu-metal or Mn-Zn ferrite
Displaying 28951 - 28975 of 73830
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