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Displaying 27751 - 27775 of 73960

Movies of Optical Parametric Downconversion

November 24, 2009
Author(s)
A Rostapshov, D Martin, D A. Branning, E Dauler, S Thomas, Alan L. Migdall, N Boeuf, Andreas Muller
A series of photos of parametric downconversion are presented in movie format to help illustrate and understand the mechanics of parametric downconversion and phase matching.

NIST Calibration Services for Liquid Volume

November 24, 2009
Author(s)
Vern E. Bean, Pedro I. Espina, John D. Wright, J F. Houser, Sherry D. Sheckels, Aaron N. Johnson
NIST provides calibration services for metal volume provers for liquid volumes from 4 L to 7600 L using gravimetric and volumetric methods. This document describes the procedures and methods of calculation used in the calibration service. The covered

Ultra-Sensitive Optical Measurements of High-J Transitions in the O2 A-band

November 24, 2009
Author(s)
Daniel K. Havey, Joseph T. Hodges, David A. Long, Mitchio Okumura, Charles E. Miller
We report frequency-stabilized cavity ring-down spectroscopy measurements of high-J O2 A-band magnetic dipole line parameters. Our goals were to measure intensities and line shape parameters for the primary isotopologue of O2 in the A-band region and to

Gas Flowmeter Calibrations With the Working Gas Flow Standard

November 23, 2009
Author(s)
John D. Wright, Jean-Phillipe Kayl, Aaron N. Johnson, Gina M. Kline
The Working Gas Flow Standard (WGFS) uses critical venturis, critical nozzles, or laminar flowmeters as working standards to calibrate customer flowmeters. The working standards are periodically calibrated with primary standards: the 34 L, 677 L, or 26 m3

Performance Measurements Towards Improved Manufacturing Vehicle Safety

November 23, 2009
Author(s)
Roger V. Bostelman, William P. Shackleford
In this paper, we describe the current 2D (dimensional) sensor and ideal sensor configurations if 3D imagers are mounted on manufacturing vehicles in an attempt to make them more safe. Towards the ideal sensor configuration, three experiments were

Optimizing Acoustic Measurements of the Boltzmann Constant

November 22, 2009
Author(s)
Michael R. Moldover
We review the progress in acoustic metrology of gases that has occurred since the 1988 measurement of the universal gas constant R using a spherical acoustic resonator. The advances in understanding resonators and in calculating the thermophysical

Practical Interdomain Routing Security

November 20, 2009
Author(s)
David R. Kuhn, Simon Liu, Hart Rossman
This article reviews risks and vulnerabilities in interdomain routing, and best practices that can have near-term benefits for routing security. It includes examples of routing failures and common attacks on routers, and coutermeasures to reduce router

Cybersecurity Fundamentals for Small Business Owners

November 19, 2009
Author(s)
Shirley M. Radack
This bulletin summarizes the information that was published in NIST Interagency Report (NISTIR) 7621, Small Business Information Security: The Fundamentals, by Richard Kissel. The publication presents three major areas that small businesses should address

Electrical Characterization of Soluble Anthradithiophene Derivatives

November 19, 2009
Author(s)
Brad Conrad, Calvin Chan, Marsha A. Loth, John E. Anthony, David J. Gundlach
Organic semiconductors remain an active subject for device physics and material science because of their varied electrical properties and potential for low-cost, high-throughput roll-to-roll processing. Several high-mobility oligomers, such as pentacene

Mobile Microrobot Characterization through Performance-Based Competitions

November 19, 2009
Author(s)
Jason J. Gorman, Craig D. McGray, Richard A. Allen
Recent advances in the design and fabrication of microelectromechanical systems (MEMS) have enabled the development of mobile microrobots that can autonomously navigate and manipulate in controlled environments. It is expected that this technology will be

Distributing UTC(NIST) to Industrial Time and Frequency Users

November 18, 2009
Author(s)
Michael A. Lombardi, Victor S. Zhang
The National Institute of Standards and Technology (NIST) maintains one of the world s most accurate and stable time scales, UTC(NIST), as well as the NIST-F1 cesium fountain, the primary frequency standard for the United States. These standards are

High contract femtosecond laser-driven intense hard X-ray source for imaging application

November 18, 2009
Author(s)
Lawrence T. Hudson, L.M Chen, W.M. Wang, M. Kando, F Liu, X.X. Lin, J.L Ma, Y.T. Li, S.V. Bulanvo, T. Tajima, Y. Kato, Z.M. Sheng, J Zhang
In this report we address the current situation of laser-driven hard X-ray sources for imaging applications,especially the saturation of X-ray conversion efficiency and the serious impact upon imaging quality.By employing high contrast laser pulses,the
Displaying 27751 - 27775 of 73960
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