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Displaying 29601 - 29625 of 74205

Shape and Size Analysis and Standards

October 6, 2008
Author(s)
Afzal A. Godil, Sanford P. Ressler
The field of anthropometry is the science of measurement of the human body from which comparisons and characterizations of the size and shape of the body in different postures can take place. The size and shape of human bodies are important in many

Alpha-Dot or Not: Comparison of Two Single Atom Optical Clocks

October 5, 2008
Author(s)
Till P. Rosenband, David Hume, Chin-Wen Chou, J.C. Koelemeij, A. Brusch, Sarah Bickman, Windell Oskay, Tara M. Fortier, Jason Stalnaker, Scott A. Diddams, Nathan R. Newbury, William C. Swann, Wayne M. Itano, David J. Wineland, James C. Bergquist
Repeated measurements of the frequency ratio of Hg + and Al + single-atom optical clocks over the course of a year yield a constraint on the possible temporal variation of the fine-structure constant a. The time variation of the measured ratio corresponds

Chip-scale atomic devices: precision atomic instruments based on MEMS

October 5, 2008
Author(s)
John E. Kitching, Svenja A. Knappe, Vladislav Gerginov, Vishal Shah, Peter D. Schwindt, Brad Lindseth, Elizabeth A. Donley, Ying-ju Wang, Eleanor Hodby, Matt Eardley, Ricardo Jimenez Martinez, William C. Griffith, Andrew Geraci, Jan Preusser, Tara C. Liebisch, Hugh Robinson, Leo Hollberg
We describe recent work at NIST to develop compact, low-power instruments based on a combination of precision atomic spectroscopy, advanced diode lasers and microelectromechanical systems (MEMS). Designed to be fabricated in parallel in large numbers

NIST F1 and F2

October 5, 2008
Author(s)
Thomas P. Heavner, Tom Parker, Jon H. Shirley, Steven R. Jefferts
The National Institute of Standards and Technology operates a cesium fountain primary frequency standard, NIST-F1, which has been contributing to International Atomic Time (TAI) since 1999. At the time of the last Symposium on Frequency Standards and

Weight Functions for Biases in Atomic Frequency Standards

October 5, 2008
Author(s)
Jon H. Shirley
We present a unified treatment of frequency-standard biases that vary significantly during the time of measurement. We introduce three time-dependent weight functions built from the solution of the unperturbed equations of motion for a two-level system. By

CTOA Measurements of Welds in X100 Pipeline Steel

October 3, 2008
Author(s)
Elizabeth S. Drexler, Philippe P. Darcis, Christopher N. McCowan, John M. Treinen, Avigdor Shtechman, Roni Reuven, Thomas A. Siewert, Robert Smith, J. Merritt, Joseph D. McColskey
A suite of tests characterizing X100 pipeline steels was initiated at the National Institute of Standards and Technology (NIST) in Boulder. Part of the test matrix included testing the toughness of the base metal, welds, and heat-affected zones (HAZ) using

A Factory-Wide EDA Data Quality Performance Simulation for APC Capabilities Analysis

October 1, 2008
Author(s)
Xiao Zhu, Dhananjay Anand, Sulaiman Hussain, Ya-Shian Li-Baboud, James Moyne
Realizing benefits from real-time process control requires in-situ monitoring of process environment, equipment, and the wafer to maximize opportunities for process improvement and minimizing effects of process deviations. The data gathered from the

Accelerated Lifetime Metrology of EUV Multilayer Mirrors in Hydrocarbon Environments

October 1, 2008
Author(s)
Shannon B. Hill, Nadir S. Faradzhev, Charles S. Tarrio, Thomas B. Lucatorto, T. E. Madey, B. V. Yakshinskiy, E. Loginova, S. Yulin
The ability to predict the rate of reflectivity loss of capped multilayer mirrors (MLMs) under various conditions of ambient vacuum composition, intensity, and previous dose is crucial to solving the mirror lifetime problem in an EUV stepper. Previous

Assessment of Industry Research Priorities for Intelligent Sensors and Control

October 1, 2008
Author(s)
YaShian Li-Baboud, Julien M. Amelot, Julien Le Guen, Alan Weber, Paul McGuire
Sensor networks and intelligent control have garnered much excitement among researchers in industry, government, and academia. Revolutionary advances have been made in the deployment of sensors and control systems for driving intelligent applications in a

BiCCL: The Biometric Client Configuration Language

October 1, 2008
Author(s)
Matthew L. Aronoff, Ross J. Micheals
In this paper, we introduce the Biometric Client Configuration Language, or BiCCL. BiCCL is a platform-independent, domain-specific language (DSL) that formally describes the biometric acquisition process. BiCCL uses high-level constructs---e.g., sensors

Centrifugal Length Separation of Carbon Nanotubes

October 1, 2008
Author(s)
Jeffrey A. Fagan, Matthew Becker, Jae H. Chun, Barry J. Bauer, Jeffrey R. Simpson, Angela R. Hight Walker, Erik K. Hobbie
Separation of single wall carbon nanotubes (SWCNTs) by length via centrifugation in a high density medium, and the characterization of both the separated fractions and the centrifugation process are presented. Significant quantities of the separated SWCNTs

Choosing the right detector for laser power and energy measurements

October 1, 2008
Author(s)
Marla L. Dowell
You may not realize the importance of good laser metrology and its many pitfalls until you realize how much of today’s commonplace conveniences – from long distance communications to LASIK (laser-assisted in situ keratomileusis) to state-of-the-art cutting

Comparing Analytical Methods for Detecting and Characterizing Nanoparticles in Formulated Products

October 1, 2008
Author(s)
Katherine M. Tyner, Anna M. Wokovich, William H. Doub, Lucinda F. Buhse, Li Piin Sung, Stephanie S. Watson, Nakissa Sadrieh
To understand the extent of consumer exposure to nanomaterials as well as how nanomaterials impact consumer goods, it is necessary to detect and characterize nanomaterials in unmodified final products. Although there are pathways to characterize

Evaluation of Thermal Imaging Cameras

October 1, 2008
Author(s)
Francine K. Amon, Andrew J. Lock, Nelson P. Bryner, Joseph P. Rice, Howard Yoon
Four thermal infrared cameras that were provided by Bureau of Industry and Security (BIS) to NIST were each evaluated by the NIST Optical Technology Division (OTD) for three metrics: Noise-equivalent Temperature Difference (NETD), Minimum Detectable

Experimental Study of the Effects of Fuel Type, Fuel Distribribution, and Vent Size on Full-Scale Underventilated Compartment Fires in an ISO 9705 Room (NIST TN 1603)

October 1, 2008
Author(s)
Andrew J. Lock, Matthew F. Bundy, Erik L. Johnsson, Anthony P. Hamins, Gwon Ko, Cheolhong Hwang, Stephen P. Fuss, Richard H. Harris Jr.
This report describes new full-scale ISO9705 compartment fire experiments, which include local measurements of temperature and species composition. The objective of this study was to generate a database of comprehensive and accurate measurements which can

f1' EVALUATION AND MEASUREMENT COMPARISON

October 1, 2008
Author(s)
Jiangen PAN, Haiping SHEN, Yuqin Zong, Yoshi Ohno
The mismatch of spectral responsivity to the CIE V(lambda) function, i. e., the f1' index, is the most critical characteristic of photometers and tristimulus colorimeters. The f1' value varies with measurement conditions, which is often omitted in the f1'

Global Structural Analysis of the Response of World Trade Center Building 7 to Fires and Debris Impact Damage. Federal Building and Fire Safety Investigation of the World Trade Center Disaster (NIST NCSTAR 1-9A) ***DRAFT for Public Comments***

October 1, 2008
Author(s)
R A. MacNeill, Steven W. Kirkpatrick, B D. Peterson, Robert T. Bocchieri, Therese P. McAllister
The objective of the work described in this report was to analyze the global response of WTC 7 to initial failure events due to fire and to analyze the resulting sequence of component and subsystem failures to determine the events that led to the global
Displaying 29601 - 29625 of 74205