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Displaying 35151 - 35175 of 74165

The development of procedures for impact testing

February 1, 2006
Author(s)
Thomas A. Siewert, Christopher N. McCowan
This report provides a broad overview of the progress in procedural improvements for impact testing. It includes a short summary of early developments, a discussion of topics that have been the subject of recent research, and a description of the

Thermally Assisted Atom Transfer on Surfaces

February 1, 2006
Author(s)
John William Gadzuk
The low-temperature rates for site-to-site transfer of single atoms and molecules adsorbed on surfaces have been determined in recent scanning tunneling microscopy (STM) studies within the temperature regime where the dominant transfer mechanism changes

Uncertainty in Finite Element Modeling and Failure Analysis: A Metrology-based Approach

February 1, 2006
Author(s)
Jeffrey Fong, James J. Filliben, Roland deWit, Richard J. Fields, Barry Bernstein, Pedro V. Marcal
In this paper, we first review the impact of the powerful finite element method (FEM) in structural engineering, and then address the shortcomings of FEM as a tool for risk-based decision making and incomplete-data-based failure analysis. To illustrate the

Cost-Effectiveness Tool Primer: Software Overview

January 31, 2006
Author(s)
Robert E. Chapman, Amy S. Rushing
Economic tools are needed to help the owners and managers of buildings, industrial facilities, and other critical infrastructure to select cost-effective combinations of mitigation strategies that respond to natural and man-made hazards. Economic tools

Overview of the First Advanced Technology Evaluations for ASSIST

January 31, 2006
Author(s)
Craig I. Schlenoff, Brian A. Weiss, Michelle P. Steves, Ann M. Virts, Michael O. Shneier, Michael Linegang
ASSIST (Advanced Soldier Sensor Information Systems Technology) is a DARPA-funded effort whose goal is to exploit soldier-worn sensors to augment the soldier s recall and reporting capability to enhance situation understanding. ASSIST is separated into two

Synthesis of Quantum Logic Circuits

January 31, 2006
Author(s)
V V. Shende, Stephen Bullock, I L. Markov
Operators acting on a collection of two-level quantum-mechanical systems can be represented by quantum circuits. In this work we develop a decomposition of such unitary operators which reveals their top-down structure and can be implemented numerically

Technical and Economic Assessment of Internet Protocol Version 6 (IPv6)

January 31, 2006
Author(s)
Gregory C. Tassey, Douglas C. Montgomery, Alfred Lee, Tim Sloan
The President’s National Strategy to Secure Cyberspace (National Strategy) directed the Secretary of Commerce to form a task force to examine the most recent iteration of the Internet Protocol, IP version 6 (IPv6). The President charged the task force with

USARSim: Providing a Framework for Multi-Robot Performance Evaluation

January 31, 2006
Author(s)
Stephen B. Balakirsky, Christopher J. Scrapper Jr, Stefano Carpin, M L. Lewis
Research efforts in urban search and rescue robotics have grown substantially in recent years. Two important robotic competitions (a robot physical league and a high-level infrastructure simulation league) were established in 2001 under the RoboCup

Summary of April 2005 ANSI/NIST Fingerprint Standard Update Workshop

January 30, 2006
Author(s)
R. McCabe, Michael D. Garris
This workshop was convened to chart the future of the ANSI/NIST-ITL 1-2000 fingerprint data exchange standard. This report is intended to provide a summary of that workshop. The current and future requirements and capabilities of existing stakeholders were

High Sensitivity Measurements of the Scattering Dispersion of Phantoms using Spectral Domain Optical Coherence Tomography

January 26, 2006
Author(s)
Shellee D. Dyer, Tasshi Dennis, Paul A. Williams, Lara Roberson, Shelley M. Etzel, Robert J. Espejo, Thomas Germer, T E. Milner
We demonstrate a novel technique to determine the size of Mie scatterers with high sensitivity. Our technique is based on spectral domain optical coherence tomography measurements of the dispersion that is induced by the scattering process. We use both Mie

Long-term Frequency Stability of Chip-Scale Atomic Clocks

January 26, 2006
Author(s)
Vladislav Gerginov, Svenja A. Knappe, V Shah, P Schwindt, Leo W. Hollberg, John E. Kitching
We present an evaluation of the long-term frequency instability and environmental sensitivity of a chip-scale atomic clock based on coherent population trapping (CPT), particularly as affected by the light source subassembly. The long-term frequency

Noise model for polarization-sensitive Optical Coherence Tomography

January 26, 2006
Author(s)
Paul A. Williams, Nate J. Kemp, David Ives, Jesung Park, Dwelle C. Jordan, H. Grady Rylander, Thomas E. Milner
Characterizing and quantifying noise sources in birefringence imaging with polarization-sensitive optical coherence tomography (PS-OCT) is necessary for the development of efficient noise reduction techniques for real-time clinical PS-OCT imaging. We

Chip-Scale Atomic Devices at NIST

January 25, 2006
Author(s)
John E. Kitching
The NIST program on chip-scale atomic devices (CSAD) seeks to design, build and characterize miniature atomic instruments and sensors based on fabrication techniques traditionally used in the field of microelectronics and micro-electric-mechanical systems

Surface oxidation of Permalloy thin films

January 24, 2006
Author(s)
M. R. Fitzsimmons, Thomas J. Silva, T. M. Crawford
The chemical and magnetic structures of oxides on the surface of Permalloy Ni 81Fe 19 films were investigated as functions of annealing time with x-ray and polarized neutron reflectometry. For annealing times of less than one hour, the oxide consisted of a

Design of Self-Assembled Multiferroic Nanostructures in Epitaxial Films

January 23, 2006
Author(s)
Igor Levin, Jiying Li, Julia Slutsker, Alexander L. Roytburd
An approach for a rational design of self-assembled multiferroic nanostructures with controlled phase morphologies was demonstrated using the 3-D epitaxial CoFe2O4-PbTiO3 films grown on single-crystal SrTiO3 substrates. The transverse nanostructures

Polyelectrolyte Multilayers

January 23, 2006
Author(s)
Darwin Reyes-Hernandez, Laurie E. Locascio, Michael Gaitan
The process of self-assembly occurs naturally in living systems to form complex structures out of random events in an incredibly accurate way. Order out of disorder is achieved in a fashion that is analogous to a jigsaw puzzle where each piece fits
Displaying 35151 - 35175 of 74165
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