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Displaying 24376 - 24400 of 73721

VISCOSITY AND DENSITY OF ALUMINUM OXIDE NANOLUBRICANT

August 17, 2011
Author(s)
Mark A. Kedzierski
This paper presents liquid kinematic viscosity and density measurements of a synthetic polyolester-based aluminum oxide (Al2O3) nanoparticle dispersion (nanolubricant) at atmospheric pressure over the temperature range 288 K to 318 K. The polyolester was a

4-bar-quasi-phasematching for second-harmonic generation in microdisks

August 15, 2011
Author(s)
Paulina S. Kuo, Glenn S. Solomon
We present a theoretical description of resonantly enhanced, 4-bar-quasi-phasematched, second-harmonic generation in microdisks made of materials possessing 4-bar symmetry, such as GaAs, GaP and ZnSe. The theory describes the interplay between quasi

A Note on Visualizing Smoke and Fire

August 15, 2011
Author(s)
Glenn P. Forney
Realistic visualization methods are important for applications where one wishes to observe data effects rather than examine data quantitatively. This note documents how the radiation transport equation (RTE) and associated numerical algorithms are used by

Interference Tests for 900 MHz Frequency-Hopping Public-Safety Wireless Devices

August 15, 2011
Author(s)
Catherine A. Remley, Michael R. Souryal, William F. Young, Daniel G. Kuester, David R. Novotny, Jeffrey R. Guerrieri
We discuss free-field measurement methods designed to quantify interference between wireless devices such as RF identification systems and RF-based emergency beacons used by fire fighters. For public safety applications, standardized testing is important

Simulation of a MIMO System in a Reverberation Chamber

August 15, 2011
Author(s)
Helge Fielitz, Kate Remley, Christopher L. Holloway
We present a general method to test MIMO antenna setups and algorithms in a reverberation chamber. Our test set-up enables measurement of data throughput using standard laboratory instruments. Using this test set up, effects of antenna setups and/or post

Static and Dynamic Propagation-Channel Impairments in Reverberation Chambers

August 15, 2011
Author(s)
Catherine A. Remley, Sander Floris, Christopher L. Holloway, Scott Prather
We study the separate and combined effects of static and dynamic multipath channels created in a reverberation chamber on bit-error-rate measurements of digitally modulated signals. We demonstrate measurement methods to identify individually both static

Ultralow phase noise microwave generation with an Er:fiber-based optical frequency divider

August 15, 2011
Author(s)
Franklyn J. Quinlan, Tara M. Fortier, Matthew S. Kirchner, Jennifer A. Taylor, Michael J. Thorpe, Nathan D. Lemke, Andrew D. Ludlow, Yanyi Jiang, Christopher W. Oates, Scott A. Diddams
We present an optical frequency divider based on a 200 MHz repetition rate Er:fiber mode-locked laser that, when locked to a stable optical frequency reference, generates microwave signals with absolute phase noise that is equal to or better than cryogenic

A digital time scale at the National Institute of Standards and Technology

August 13, 2011
Author(s)
Stefania Romisch, Steven R. Jefferts, Thomas E. Parker
An integrated time scale has as primary data unit of duration (time interval) defined by atomic standards according to the definition of the SI second. The availability of more than one atomic standard allows for averaging, thereby improving the

Dual comb-based characterization of rapidly tuned lasers

August 13, 2011
Author(s)
Fabrizio R. Giorgetta, Esther Baumann, Ian R. Coddington, William C. Swann, Nathan R. Newbury, Zeb Barber, Peter Roos
Time-resolved, high-accuracy and high-resolution spectroscopy of rapidly tuned cw lasers is critical to realizing their full potential for sensing, but is not possible with conventional spectrometers. We demonstrate a coherent dual-comb-based spectrometer

Measurement of Shielding Effectiveness of Electrically-Small Enclosures

August 13, 2011
Author(s)
Christopher L. Holloway, Colton R. Dunlap, John M. Ladbury, Joshua A. Gordon, Jason B. Coder, Galen H. Koepke
In the following we propose a technique for determining the shielding effectiveness (SE) an electrically small enclosure. In particular, we use this technique to explore the shielding characteristics of a rectangular box used to shield a satellite based

Real-Time Generation of the SIM Time Scale (SIMT) from International Clock Comparisons

August 13, 2011
Author(s)
Michael A. Lombardi, Jose M. Lopez, Andrew N. Novick, Francisco Jimenez, Nelida Diaz-Munoz, Eduardo de Carlos Lopez, Jean-Simon Boulanger, Raymond Pelletier, Ricardo de Carvalho, Raul Solis, Harold Sanchez, Liz C. Forero, Junior Gordon, Daniel Perez, Eduardo Bances, Leonardo Trigo, Victor Masi, Henry Postigo, Anthony Questelles, Anselm Gittens, Rodrigo Ramos P.
The Sistema Interamericano de Metrologia (SIM) is one of the world’s five major regional metrology organizations (RMOs). The SIM members are the national metrology institutes (NMIs) located in the 34 nations of the Organization of American States (OAS)

Calibration of dynamic sensors for noncontact-atomic force microscopy

August 12, 2011
Author(s)
Gordon A. Shaw, Jon R. Pratt, Zeina J. Kubarych
Access to quantitative information on surface forces in noncontact-atomic force microscopy (NC-AFM) requires the accurate calibration of several key sensor parameters. This work outlines a dynamic method for calibrating the spring constant of tuning fork

Guide for Security-Focused Configuration Management of Information Systems

August 12, 2011
Author(s)
L A. Johnson, Kelley L. Dempsey, Ronald S. Ross, Sarbari Gupta, Dennis Bailey
The purpose of Special Publication 800-128, Guide for Security-Focused Configuration Management of Information Systems, is to provide guidelines for organizations responsible for managing and administering the security of federal information systems and

Hyperspectral Imaging and Analysis of Single Erythrocytes

August 12, 2011
Author(s)
Ji Y. Lee, Matthew L. Clarke, Fuyuki Tokumasu, John F. Lesoine, David W. Allen, Robert C. Chang, Maritoni A. Litorja, Jeeseong Hwang
We report a hyperspectral imaging and analysis technique to resolve unique physico-chemical characteristics of subcellular substances in single erythrocytes. We constructed a microscope system installed with a spectral light engine capable of controlling
Displaying 24376 - 24400 of 73721
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