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Displaying 26301 - 26325 of 73697

Reference Material (RM) 8820: A Versatile New NIST Standard for Nanometrology

July 19, 2010
Author(s)
Michael T. Postek, Andras Vladar, William J. Keery, Michael R. Bishop, Benjamin Bunday, John Allgair
A new multipurpose instrument calibration standard has been released by NIST. This standard was developed to be used primarily for X and Y scale (or magnifi cation) calibrations of scanning electron microscopes from less than 10 times magnification to more

The Effect of Assessor Errors on IR System Evaluation

July 19, 2010
Author(s)
Ben Carterette, Ian Soboroff
Recent efforts in test collection building have focused on scaling back the number of necessary relevance judgments and then scaling up the number of search topics. Since the largest source of variation in a Cranfield-style experiment comes from the topics

Vulnerability Trends: Measuring Progress

July 19, 2010
Author(s)
David R. Kuhn, Christopher S. Johnson
What is the state of security engineering today? Are we as an industry making progress? What are prospects for the future? To address these questions we analyze data from the National Vulnerability Database (NVD).

Modeled Infiltration Rate Distributions for U.S. Housing

July 18, 2010
Author(s)
Andrew K. Persily, Amy Musser, Steven J. Emmerich
A set of 209 dwellings that represent 80 % of U.S. housing stock was used to generate frequenc distributions of residential ventilation rates. The set of homes is based on an anal sis of the 1997 U.S. Department of Energ s Residential Energ Consumption

Towards Evolutionary-Pricing Framework for Mobile Sensor Network Self-organization

July 18, 2010
Author(s)
Vladimir V. Marbukh, Kamran Sayrafian, Hamid Mahboubi, Ahmadreza Momeni, Amir G. Aghdam
This paper reports on work in progress on developing a unified co-evolutionary/pricing framework for Mobile Sensor Networks (MSN) self-organization. MSN self-organization involves cooperative sensor positioning and formation of a multi-hop Mobile Ad-hoc

Resolved sideband emission from dynamically strained quantum dots

July 16, 2010
Author(s)
Michael Metcalfe, Stephen M. Carr, Andreas Muller, Glenn S. Solomon, John R. Lawall
The dynamic response of InAs/GaAs self-assembled quantum dots (QDs) to strain is studied by periodically modulating the QDs with a surface acoustic wave (SAW) and measuring the QD fluorescence with both photoluminescence and resonant spectroscopy. When the

Choosing test positions for laser tracker evaluation and future Standards development

July 15, 2010
Author(s)
Balasubramanian Muralikrishnan, Daniel S. Sawyer, Christopher J. Blackburn, Steven D. Phillips, Craig M. Shakarji, Ed Morse, Robert Bridges
A working group within the ISO TC 213 committee is developing a draft document [11] for evaluating the performance of laser trackers. The ASME B89.4.19 Standard [1] and the draft VDI/VDE 2617 part 10 [2] describe some useful tests that are incorporated

Spectroradiometric Calibration of Telescopes using Laser Illumination of Flat Field Screens

July 15, 2010
Author(s)
Steven W. Brown, Claire E. Cramer, Keith R. Lykke, Allan W. Smith, John T. Woodward IV, Peter Doherty, Emilio Falco, Christopher W. Stubbs
It is standard practice at many telescopes to take a series of flat field images prior to an observation run. Typically the flat field consists of a screen mounted inside the telescope dome that is uniformly illuminated with a broadband light source. These

COMPARISON OF NEAR-FIELD METHODS AT NIST K. MacReynolds, M.H. Francis and D. Tamura

July 14, 2010
Author(s)
Katherine MacReynolds, Michael H. Francis, Douglas T. Tamura
A comparison of the planar, spherical and cylindrical near-field techniques was completed at the National Institute of Standards and Technology (NIST) for a Ku-band Cassegrain reflector antenna. This paper discusses the measurement results for the near-to

Measuring Security Risk of Networks Using Attack Graphs

July 14, 2010
Author(s)
Steven Noel, Lingyu Wang, Anoop Singhal, Sushil Jajodia
Today's computer systems face sophisticated attackers who combine multiple vulnerabilities to penetrate networks with devastating impact. The overall security of a network cannot be determined by simply counting the number of vulnerabilities. To accurately

Thermodynamic, Transport, and Chemical Properties of Reference JP-8

July 14, 2010
Author(s)
Thomas J. Bruno, Marcia L. Huber, Arno R. Laesecke, Eric W. Lemmon, Mark O. McLinden, Stephanie L. Outcalt, Richard A. Perkins, Beverly L. Smith, Jason A. Widegren
This report contains a summary of research conducted to develop a standard or accepted set of thermophysical properties for the aviation kerosene, JP-8. This report is the culmination of a three year effort that included the participation of most of the

Active Millimeter-Wave Imaging: Standoff Detection of Concealed Weapons

July 13, 2010
Author(s)
Randy Direen, David R. Novotny, Katherine MacReynolds
A near-field planar scanner is used to construct images of a nearby scene illuminated with millimeter-wave frequencies. We present our initial work in active millimeter-wave imaging, and how it applies to the detection of concealed weapons.

Controlled nucleation of GaN nanowires grown with molecular beam epitaxy

July 13, 2010
Author(s)
Kristine A. Bertness, Aric W. Sanders, Devin M. Rourke, Todd E. Harvey, Alexana Roshko, Norman A. Sanford
The location of GaN nanowires was controlled with essentially perfect selectivity using patterned SiNx prior to molecular beam epitaxy growth. Growth was uniform within mask openings and absent on the mask surface for over 95 % of the usable area of a 76

Effect on Flow Stress of a Rapid Phase Transition in AISI 1045 Steel

July 13, 2010
Author(s)
Timothy J. Burns, Steven P. Mates, Richard L. Rhorer, Eric P. Whitenton, Debasis Basak
New experimental data on AISI 1045 steel from the NIST pulse-heated Kolsky Bar Laboratory are presented. The material is shown to exhibit a nonequilibrium phase transformation at high strain rate. An interesting feature of these data is that the material

ANALYSIS OF SEGMENT-BY-SEGMENT ? - NTU MODELLING OF A MINICHANNEL CO2 GAS COOLER

July 12, 2010
Author(s)
Santiago M. Ballester, Jose M. Corberan, Jose Gonzalvez-Macia, Piotr A. Domanski
Most of the current air-to-refrigerant heat exchanger models use the classic ε-NTU approach. These models do not account for longitudinal conduction neither in the fin nor in the tube, transverse conduction in the tube, and for the heat conduction between
Displaying 26301 - 26325 of 73697
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