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NIST Authors in Bold

Displaying 30851 - 30875 of 74075

High-Q GaN nanowire resonators and oscillators

November 16, 2007
Author(s)
Shawn M. Tanner, Jason M. Gray, Charles T. Rogers, Kristine A. Bertness, Norman Sanford
We report high mechanical quality factors Q for GaN nanowire cantilevers grown by molecular beam epitaxy. Nanowires with 30-500 nm diameters and 5-20 υm lengths having resonance frequencies from 400 kHz to 2.8 MHz were measured. Q near room temperature and

Characterization of 3-Color CARS in a 2-Pulse Broadband CARS Spectrum

November 15, 2007
Author(s)
Young Jong Lee, Marcus T. Cicerone, Yuexin Liu
We present a new and simple approach to broadband coherent anti-Stokes Raman scattering (CARS) microscopy that yields background-free vibrational spectra. We present evidence for a mechanism where two different frequency components in a continuum pulse

Guide to Storage Encryption Technologies for End User Devices

November 15, 2007
Author(s)
Karen A. Scarfone, Murugiah P. Souppaya, Matt Sexton
Many threats against end user devices, such as desktop and laptop computers, smart phones, personal digital assistants, and removable media, could cause information stored on the devices to be accessed by unauthorized parties. To prevent such disclosures

Magic Wavelengths for the np - ns Transitions in Alkali-Metal Atoms

November 15, 2007
Author(s)
B Arora, M S. Safronova, Charles W. Clark
Extensive calculations of the electric-dipole matrix elements in alkali-metal atoms are conducted using the relativistic all-order method. This approach is a linearized version of the coupled-cluster method, which sums infinite sets of many-body

Nothing is Brittle at the Nanoscale

November 15, 2007
Author(s)
Pradeep N. Namboodiri, Doo-In Kim, Jaroslaw Grobelny, T Hawa, B Henz, Michael R. Zachariah
Fracture of nanoscale contacts formed between spherical probes and flat samples is studied using an atomic force microscope (AFM) in ultra high vacuum environment. Analysis of the nonlinear elastic behavior observed during the fracture process in the force

Stable Navigation Solutions for Robots in Complex Environments

November 15, 2007
Author(s)
Christopher J. Scrapper Jr, Rajmohan Madhavan, Stephen B. Balakirsky
During the initial phase of a disaster response it is essential for responders to quickly and safely assess the overall situation. The use of rescue robots that can autonomously navigate and map these environments can help responders realize this goal

Thermodynamic Radiation Thermometry for the Next SI

November 15, 2007
Author(s)
Howard W. Yoon, Charles E. Gibson, V B. Khromchenko, George P. Eppeldauer, Robert R. Bousquet, Steven W. Brown, Keith R. Lykke
We describe the construction, the calibration and the use of the NIST Thermodynamic Radiation Thermometer (TRT) to measure the temperature of the gold-freezing temperature blackbody and a variable-temperature blackbody from 800 ?C to 2700 ?C. These

DSR-Based Directional Routing Protocol for Ad Hoc Networks

November 14, 2007
Author(s)
Bin Hu, Hamid Gharavi
In this paper, a Dynamic Source Routing (DSR)-based directional routing protocol is invoked for wireless ad hoc networks using directional antennas. This is designed to balance the trade-off between co-channel interferences from nodes hops away, and the

The TRECVID 2007 BBC Rushes Summarization Evaluation Pilot

November 14, 2007
Author(s)
Paul D. Over, Alan Smeaton, Phillip Kelly
This paper provides an overview of a pilot evaluation of video summaries produced automatically from unedited BBC dramatic series video. It was carried out under the auspices of the TREC Video Retrieval Evaluations (TRECVID.) Twenty-two research teams

Growth of Silicon Carbide Nanowires by a Microwave Heating-Assisted Physical Vapor Transport Using Group VIII Metal Catalysts

November 13, 2007
Author(s)
Siddarth Sundaresan, Albert Davydov, Mark D. Vaudin, Igor Levin, James E. Maslar, Yong-lai Tian, M V. Rao
SiC nanowires are grown by a novel catalyst-assisted sublimation-sandwich (SS) method. This involves microwave heating-assisted physical vapor transport from a source 4H-SiC wafer to a closely positioned substrate 4H-SiC wafer. The substrate wafer is

Monitoring Contaminants in Seabirds: The Importance of Specimen Banking

November 13, 2007
Author(s)
Stacy S. Vander-Pol, Paul R. Becker
Historically, contaminants in seabird tissues were monitored by considering physically visible effects; however, subtle, sub-lethal effects are also important. Several long-term monitoring and specimen banking programs are in place for seabirds, and the

Physical and Chemical Data, Section 2

November 13, 2007
Author(s)
Daniel G. Friend, Bruce E. Poling, George H. Thomson, Thomas E. Daubert, Evan Buck
This Section provides tabular material for the physical and chemical properties of substances of interest to the chemical engineering community. Many of the tables have been generated using NIST standard reference data formulations, which provide

Preliminary Performance Assessment of Commercially-Available Hydrogen Sensors

November 12, 2007
Author(s)
Nathan D. Marsh, Thomas G. Cleary
As part of an effort to develop standard test methods for the performance of commercial hydrogen sensors, we employed the Fire Emulator / Detector Evaluator, an instrumented flow system designed to study the response of fire detectors (smoke, heat, gas)

Supplementary Backward Equations for the Industrial Formulation IAPWS-IF97 of Water and Steam for Fast Calculations of Heat Cycles, Boilers, and Steam Turbines

November 12, 2007
Author(s)
H J. Kretzschmar, K Knobloch, K Miyagawa, Allan H. Harvey, Wolfgang Wagner
This Extended Abstract summarizes the various supplementary equations that have been developed by the International Association for the Properties of Water and Steam to improve the calculation speed of the industrial standard formulation IAPWS-IF97 for
Displaying 30851 - 30875 of 74075