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Displaying 27226 - 27250 of 73929

On Walking in the Footprints of Giants

March 1, 2010
Author(s)
Marilyn E. Jacox
This chapter tells of a lifelong fascination with light, a messenger bearing information from realms ranging from the galactic to the submicroscopic. Personal interactions have shaped and informed this life journey. Accounts of some of the most important

Physics Laboratory: Activities, Accomplishments & Recognition 2008-2009

March 1, 2010
Author(s)
Jonathan E. Hardis
This report summarizes the research and measurement science carried out during 2008-2009 in the NIST Physics Laboratory. The Laboratory supports U.S. industry, government, and the scientific community by providing measurement services and research for

The wildland-urban interface fire problem - Current approaches and Research Needs

March 1, 2010
Author(s)
William E. Mell, Samuel L. Manzello, Alexander Maranghides, David T. Butry, Ronald G. Rehm
Wildfires that spread into wildland-urban interface (WUI) communities present significant challenges on a number of fronts. In the United States the WUI accounts for a significant portion of wildland fire suppression and wildland fuel treatment costs

Thin film morphology of organic electronic materials

March 1, 2010
Author(s)
Xinran Zhang, Steven Hudson, Dean DeLongchamp, David J. Gundlach
Organic electronic materials are desired for low-cost printed circuits. As expected, the microstructure of these materials is crucial for their performance, such as charge-carrier mobility. These materials typically comprise anisotropic molecules, and the

Weight Functions for Biases in Atomic Frequency Standards

March 1, 2010
Author(s)
Jon H. Shirley
Many perturbations that affect atomic frequency standards vary during the period of measurement. To include this time variation, we introduce three time-dependent weight functions built from the solution of the unperturbed equations of motion of a two

A Collection of 2D Elliptic Problems for Testing Adaptive Algorithms

February 26, 2010
Author(s)
William F. Mitchell
Adaptive grid refinement is a critical component of the improvements that have recently been made in algorithms for the numerical solution of partial differential equations (PDEs). The development of new algorithms and computer codes for the solution of

AN AUTOMATIC OVERLAP-BASED CELL TRACKING SYSTEM

February 26, 2010
Author(s)
Joe Chalfoun, Antonio Cardone, Alden A. Dima, Michael Halter, Daniel P. Allen
In order to facilitate the extraction of quantitative data from live cell image sets, automated image analysis methods are needed. This paper presents an overlap-based cell tracking algorithm that has the ability to track cells across a set of time-lapse

The DEMO Quasisymmetric Stellarator

February 26, 2010
Author(s)
Paul R. Garabedian, Geoffrey B. McFadden
The NSTAB code solves differential equations in conservation form, and the TRAN test particle code tracks guiding center orbits in a fixed background, to provide simulations of equilibrium, stability, and transport in tokamaks and stellarators. These codes

An Interoperability Test System for IEEE 1451.5-802.11 Standard

February 25, 2010
Author(s)
Eugene Song, Kang B. Lee
Interoperability is the ability of systems or software applications to communicate with each other. Interoperability testing verifies that systems can work together based on a standard protocol in an operational environment. This paper introduces an

Connecting Buildings to Public Safety Networks

February 25, 2010
Author(s)
Alan B. Vinh, David G. Holmberg
The operation of modern commercial buildings uses digital control systems which monitor a vast amount of sensors. These sensors in turn produce data that is available for building control but also can be mission-critical for effective emergency response

Detection of Voigt Spectral Line Profiles of Hydrogen Radio Recombination Lines toward Sagittarius B2(N)

February 24, 2010
Author(s)
Francis J. Lovas, Azrael A. von Prochazka, Anthony J. Remijan, Dana S. Balser, Robert S. Ryans, Adele H. Marshall, Frederic R. Schwab, Jan M. Hollis, Phil R. Jewell
We report the detection of Voigt spectral line profiles of radio recombination lines (RRLs) toward Sagittarius B2(N) with the 100-m Green Bank Telescope (GBT). These results constitute the first known, unambiguous detection of the Voigt spectral line shape
Displaying 27226 - 27250 of 73929
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