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Displaying 32901 - 32925 of 74474

Measuring the Luminance of a Retroreflective Sign

July 11, 2007
Author(s)
Carl C. Miller, T Heimer, Tim Donahue, M Schwartz, David Kuniega
The area of retroreflective signage for traffic control is moving from fixed retroreflective requirements to a traffic scenario/performance based system. CIE Technical Report 54.2, Retroreflection: Definition and Measurement , published in 2001, offers

New Photometer Standards for Low Uncertainty Illuminance Scale Realization

July 11, 2007
Author(s)
George P. Eppeldauer, Carl C. Miller, Yoshihiro Ohno
Improved performance photometers have been developed at the National Institute of Standards and Technology (NIST) to utilize the low spectral responsivity uncertainty of spectral irradiance responsivity measurements performed on the facility of Spectral

Pilot Study on Daytime Color Appearance of Retroreflective Sheeting

July 11, 2007
Author(s)
Wendy L. Davis, Carl C. Miller, Jason Kennedy, Carl Andersen
In this experiment, reference instrument measurements of the chromaticity of retroreflective materials were compared with human visual perceptions of their colors under daytime conditions. A hue scaling method was used to measure perceived color. Four

Subwavelength Addressibility and Spin-Dependent Transport in a Double-Well Optical Lattice

July 11, 2007
Author(s)
Patricia J. Lee, M Anderlini, Ben L. Brown, Jennifer Sebby-Strabley, William D. Phillips, James V. Porto
We report the experimental demonstration of site-selective RF addressing of atoms with sub-wavelength resolution in a spin-dependent optical lattice of double wells. We also show spin-dependent transport: coherent spatial separation of atomic wave packets

Synthetic Incoherence for Electron Microscopy

July 11, 2007
Author(s)
Zachary H. Levine, Robyn M. Dunstan
Tomographic studies of submicrometer samples in materials science using electron microscopy have been inhibited by diffraction effects. In the present work, we describe two practical methods for ameliorating these effects. In one, the sample is scanned

Microfluidic Dynamic Light Scattering Used for High Throughput Measurements

July 10, 2007
Author(s)
Thomas Q. Chastek, Kathryn L. Beers, Eric J. Amis
When diluted in some solvents, surfactants and block copolymers self-assemble into micelles or vesicles of about 10-100 nm in size. There is a great deal of interest in micelles and vesicles because they are widely used in the formulations industry, and

Robust Indoor Positioning Based on Received Signal Strength

July 10, 2007
Author(s)
Kamran Sayrafian, Julio Perez
RF-based indoor positioning is a challenging task due to the harsh indoor propagation environment. Techniques based on the received signal strength are simple to implement and offer low cost and effective alternatives for some applications. The main

NIST/TRC Web Thermo Tables - Lite Edition NIST Standard Reference Subscription Database 2

July 9, 2007
Author(s)
Andrei F. Kazakov, Chris Muzny, Robert D. Chirico, Vladimir Diky, Becky A. Stevenson, Michael D. Frenkel
WTT - Lite Edition, a Web version of the TRC Thermodynamic Tables, represents a collection of critically evaluated thermodynamic property data for 150 commonly-used (primarily organic) pure compounds. References to experimental data sources and information

Quantifying Interpretability for Motion Imagery: Applications to Image Chain Analysis

July 9, 2007
Author(s)
Charles D. Fenimore, J Irvine, D Cannon, S Israel, G O'Brien, A Aviles, John W. Roberts
The motion imagery community will benefit from the availability of standard measures for assessing image interpretability. The National Imagery Interpretability Rating Scale (NIIRS) has served as a community standard for still imagery, but no comparable

TRC Thermodynamics Tables - Non-Hydrocarbons Supplement NH97

July 9, 2007
Author(s)
Michael D. Frenkel
1. Table 23-2-1-(1.10292)-db: Pages db-5172.0 and db-5172.1 New table for 2,5-dimethyl-5-hexen-3-yn-2-ol containing the density for the real fluid at selected temperatures and pressures. 2. Table 23-2-1-(3.21501)-db: Pages db-6180.0 through db-6180.3 New

Ultraviolet Characterization of Integrating Spheres

July 9, 2007
Author(s)
Ping-Shine Shaw, Zhigang Li, Uwe Arp, Keith R. Lykke
We have studied the performance of integrating spheres in the ultraviolet (UV) with wavelengths as short as 200 nm. Two techniques were used for this study; first, the spectral throughput of an integrating sphere irradiated by a deuterium lamp was analyzed

Evaluation of the electromagnetic penetration of the NASA space shuttle endeavour using an ultra wideband measurement system

July 8, 2007
Author(s)
Robert T. Johnk, Robert Scully, David R. Novotny, Chriss A. Grosvenor, Nino Canales, Dennis G. Camell, Galen H. Koepke
This paper summarizes a joint NIST-NASA measurement effort to evaluate the electromagnetic penetration of the shuttle Endeavour. NASA is concerned about the effects that microwave imaging radar systems might have on critical avionics systems on its fleet

Free Space Antenna Factors through the use of Time-Domain Signal Processing

July 8, 2007
Author(s)
Dennis G. Camell, Robert T. Johnk, David R. Novotny, Chriss A. Grosvenor
This paper demonstrates the usefulness of time domain processing to determine free-space antenna factors,FSAF, for EMC antennas. Procedures are explained and data is provided from 30 MHz to 9 GHz. We investigate time gating of dense frequency packed

Lidar with femtosecond fiber-laser frequency combs

July 8, 2007
Author(s)
Nathan R. Newbury, William C. Swann, Ian R. Coddington
Passively mode-locked fiber lasers produce a broad spectrum of light that is also highly phase-coherent. Such sources have clear potential for remote sensing because their broad spectrum permits high range resolution and the coherence permits operation at

Characterization of the Potential Energy Landscape in an Antiplasticized Polymer

July 6, 2007
Author(s)
Robert A. Riggleman, Jack F. Douglas, J J. de Pablo
Transition state searches have been performed on model coarse-grained polymer systems, and the results compared to those of an antiplasticized polymer system, which have been previously shown to be fragile and strong glass-forming systems, respectively. It

Silicon Nanowire Electromechanical Switches for Logic Device Application

July 6, 2007
Author(s)
Qiliang Li, Sang-Mo Koo, Monica D. Edelstein, John S. Suehle, Curt A. Richter
Electromechanical switches consisting of chemical-vapor-deposition grown silicon nanowires suspended over metal electrodes have been fabricated successfully by using single nanowires manipulation and compatible photolithographic processes. The switches are

Correction of Stray Light In Spectroradiometers and Imaging Instruments

July 4, 2007
Author(s)
Yuqin Zong, Steven W. Brown, Keith R. Lykke, Yoshihiro Ohno
Measurement errors from stray light, spectral or spatial, are inevitable and are often the dominant source of error in spectroradiometers and imaging radiometers/photometers. We have developed a simple matrix method for correcting spatial stray light in

Differential Atomic Magnetometry Based on a Diverging Laser Beam

July 3, 2007
Author(s)
Eleanor Hodby, Elizabeth A. Donley, John E. Kitching
We demonstrate a novel atomic magnetometer that uses differential detection of the spatially diverging components of a light field to monitor the Larmor precession frequency of atoms in a thermal vapor. The design is implemented in compact form with a
Displaying 32901 - 32925 of 74474
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