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Displaying 32101 - 32125 of 74084

Scanning Advanced Automobile Technology

January 31, 2007
Author(s)
Hamid Gharavi, K V. Prasad, P. Ioannou
The progress of some of the key electrical, electronics, communications, controls and software technologies that enable in-vehicle, vehicle-to-vehicle (V2V) and vehicle-to-infrastructure (V2I) functions is presented, in historical, current & futuristic

Technology Evaluations and Performance Metrics for Soldier-Worn Sensors for ASSIST

January 31, 2007
Author(s)
Brian Weiss, Craig I. Schlenoff, Michael O. Shneier, Ann Virts
The DARPA-funded Advanced Soldier Sensor Information Systems and Technology (ASSIST) project is aimed at developing soldier-worn sensors to increase a soldier s battlefield awareness during humanitarian and combat missions, provide them with data

Traversability Metrics for Urban Search and Rescue Robots on Rough Terrain

January 31, 2007
Author(s)
V Molino, Rajmohan Madhavan, Elena R. Messina, Anthony J. Downs, Adam S. Jacoff, Stephen B. Balakirsky
Rough terrain, such as the rubble that we would expect to find in urban disaster areas, will likely impede robot mobility. The goal of this paper is to find methods for quantifying the difficulty a robot should encounter traversing a region of rough

A Physics Based Approach to Modeling Grassland Fires

January 30, 2007
Author(s)
William E. Mell, M A. Jenkins, J Gould, P Cheney
Physics based coupled fire-atmosphere models are based on approximations to the governing equations of fluid dynamics, combustion, and the thermal degradation of solid fuel. They require significantly more computational resources than the most commonly

Combinatorial Materials Science: Measures of Success

January 30, 2007
Author(s)
Michael J. Fasolka, Eric J. Amis
points across parameter space. When designed effectively, combinatorial libraries explore a range of parameters in a rational and reliable manner. Second, where traditional experiments test and analyze samples in a one at a time mode, combinatorial

Effective-Range Description of a Bose Gas Under Strong Confinement

January 29, 2007
Author(s)
Pascal Naidon, Eite Tiesinga, William F. Mitchell, Paul S. Julienne
We point out in this paper that previous theories describing s-wave collisions of atomic bosons confined in 1D or 2D geometries can be extended to much tighter confinements by simply replacing the scattering length by the effective energy-dependent

Chemical Twinning of the Pyrochlore Structure in the System Bi 2 O 3-Nb 2O 5

January 28, 2007
Author(s)
Ian E. Grey, W G. Mumme, Terrell A. Vanderah, Robert S. Roth, C Bougerol-Chaillout
New ternary bismuth iron niobates having structures based on chemical twinning of pyrochlore are described. Bi5.67Nb10FeO35 has hexagonal symmetry, P63/mmc, a = 7.432(1) , c = 31.881(2) , Z = 2 and Bi9.3Nb16.9Fe1.1O57.8 has rhombohedral symmetry, R-3m, a =

Pattern-directed to isotropic dewetting transition in polymer films on micropatterned surfaces with differential surface energy contrast

January 27, 2007
Author(s)
D Julthongpiput, Wenhua Zhang, Jack F. Douglas, Alamgir Karim, Michael J. Fasolka
Surface chemical patterns can both cause and direct dewetting in overlying thin films. However, a key factor in this behavior, the magnitude of surface energy differences between pattern domains ( ?g ), is largely unevaluated. To probe the effect of this

Contact Mechanics of Layered Elastic Materials: Experiment and Theory

January 26, 2007
Author(s)
P M. McGuiggan, Jay S. Wallace, Douglas T. Smith, I Sridhar, Z Zheng, K L. Johnson
This paper reports an experimental and theoretical investigation of the indentation of a layered elastic solid, with special reference to the surface force apparatus (SFA). The contacting surfaces of the SFA comprise a 3-layer material: a thin mica surface

Leakage Effects in Microwave Power Measurements

January 26, 2007
Author(s)
Ronald A. Ginley, Denis X. LeGolvan, Ann F. Monke
Because microwave power measurements are used to support almost every segment of the microwave electronics industry, the accuracy of these measurements is critical. Recently, we have several different problems that affect microwave power measurements which

Leakage Effects on Microwave Power Measurements

January 26, 2007
Author(s)
Ronald A. Ginley, Denis X. LeGolvan, Ann F. Monke
Microwave power measurements are used to support almost every every segment of the microwave electronics industry. It is very important for these measurements to be as accurate as possible. Recently we have found several different problems that affect

Light Force in Ultracold Photoassociation

January 26, 2007
Author(s)
Eduardo Gomez, A T. Black, Lincoln Turner, Eite Tiesinga, Paul D. Lett
We study the time-resolved photoassociation of ultracold sodium in an optical dipole trap. The photoassociation laser excites pairs of atoms to molecular states of large total angular momentum at high intensities (above 20 kW/cm2). Such transitions are

National Marine Analytical Quality Assurance Program:Results and Description of the NIST/NOAA 2005 Interlaboratory Comparison Exercise for Trace Elements in Marine Mammals

January 24, 2007
Author(s)
Steven J. Christopher, Rebecca S. Pugh, Michael B. Ellisor, Elizabeth A. Mackey, Rabia Oflaz, Barbara J. Porter, Kathie J. Bealer, John R. Kucklick, Paul R. Becker, T K. Rowles
NIST helps benchmark and improve the quality of analytical data gathered on the marine environment by administering annual interlaboratory comparison exercises through several programs, including the National Marine AnalyticalQuality Assurance Program

Optimal Quantum Measurements of Expectation Values of Observables

January 24, 2007
Author(s)
Emanuel Knill, Gerardo Ortiz, Rolando Somma
Experimental characterizations of a quantum system involve the measurement of expectation values of observables for a preparable state |f> of the quantum system. Such expectation values can be measured by repeatedly preparing |f> and coupling the system to

A High-Throughput Thermoelectric Power-Factor Screening Tool for Rapid Construction of Thermoelectric Property Diagrams

January 23, 2007
Author(s)
Makoto Otani, Nathan Lowhorn, Peter K. Schenck, Winnie K. Wong-Ng, Martin L. Green, K Itaka, H Koinuma
We have developed a high throughput screening tool that maps out thermoelectric power factors of combinatorial composition-spread film libraries. The screening tool allows us to measure the electrical conductivity and Seebeck coefficient of over 1000

TEM Horn Antenna Design Principles

January 23, 2007
Author(s)
Chriss A. Grosvenor, Robert T. Johnk, David R. Novotny, Nino Canales, Benjamin Davis, Jason Veneman
The National Institute of Standards and Technology has developed several ultra-wideband, TEM Horn antennas with phase linearity, short impulse duration, and a near constant antenna factor. These are time-domain antennas used to measure impulsive fields
Displaying 32101 - 32125 of 74084