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Search Publications

NIST Authors in Bold

Displaying 26151 - 26175 of 74151

Developing Coverage Analysis for IFC Files

November 16, 2010
Author(s)
Robert R. Lipman
Conformance and interoperability testing of product data exchange interfaces is essential to delivering reliable software implementations and meeting user’s expectations for interoperability between BIM software. For either type of testing, product data

Fire Suppression

November 16, 2010
Author(s)
Cary Presser, Jiann C. Yang
Water sprinkler sprays (with relatively large droplet sizes) in residential and commercials structures are probably the most well known application of sprays in fire suppression. In more recent years, water mists (characterized by reduced droplet sizes

November 2010 SRM Spotlight

November 16, 2010
Author(s)
Regina R. Montgomery
The SRM Spotlight is a newsletter published by the Measurement Services Division for users of NIST standard reference materials. The Spotlight announces new reference materials and provides information about their use. In addition, this newsletter contains

SlapSegII Analysis: Matching Segmented Fingerprint Images

November 16, 2010
Author(s)
Craig I. Watson
This report is an extension of the SlapSegII evaluation and will study the affect of slap fingerprint segmentation on matching accuracy. This study will compare matching accuracy of hand marked segmentation data with the automated segmentation algorithms

A Portable Rubidium Fountain

November 15, 2010
Author(s)
Paul D. Kunz, Steven R. Jefferts, Thomas P. Heavner
We are developing a transportable laser-cooled rubidium (Rb) atomic fountain frequency standard. Over the last year we have built the Ramsey cavity and rubidium source oven and are preparing to assemble the physics package. We have also made numerous

Lateral Uniformity in Chemical Composition along a Buried Reaction Front in Polymers

November 15, 2010
Author(s)
Kristopher Lavery, Vivek Prabhu, Sushil K. Satija, Wen-Li Wu
Off-specular neutron reflectometry was applied to characterize the form and amplitude of lateral compositional variations at a buried reaction-diffusion front. In this work, off-specular neutron measurements were first calibrated using off-specular X-ray

NIST F1 and F2

November 15, 2010
Author(s)
Thomas P. Heavner, Thomas E. Parker, Jon H. Shirley, Paul D. Kunz, 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. During the intervening 11 years we have improved NIST-F1 so that

On-Board GPS Clock Monitoring for Signal Integrity

November 15, 2010
Author(s)
Marc A. Weiss, Pradipta Shome, Ron Beard
Navigation signal integrity is paramount for aviation and safety of life services. Hitherto GPS signal anomaly alerting has been provided primarily by ground based augmentations. Significantly improved navigation signal integrity and quality may be

Decoherence due to elastic Rayleigh scattering

November 12, 2010
Author(s)
Hermann Uys, Michael J. Biercuk, Aaron Vandevender, Christian Ospelkaus, Dominic Meiser, R. Ozeri, John Bollinger
We present theoretical and experimental studies of the decoherence of hyperfine ground-state superpositions due to elastic Rayleigh scattering of off-resonant light. We demonstrate that under appropriate conditions, elastic Rayleigh scattering can be the

Single Crystal Study of Competing Rhombohedral and Monoclinic Order in Lead Zirconate Titanate

November 12, 2010
Author(s)
Daniel P. Phelan, X. Long, Y. Xie, Z.-G. Ye, A. M. Glazer, H. Yokota, P. A. Thomas, Peter M. Gehring
Neutron diffraction measurements were performed on single crystals of PbZr 1¿xTi xO 3 (PZT)with x=0.325 and x=0.460. The data refute the thesis that the ferroelectric phases of PZT within this composition range, all of which are strongly piezoelectric, are

Collective atomic recoil motion in short-pulse matter-wave superradiance

November 11, 2010
Author(s)
Lu Deng, Edward W. Hagley
We show that a Bragg resonance is substantially incapacitated in short-pulse, matter-wave superradiant scatterings and both positive- and negative-order scatterings contribute equally.We further show that propagation gain is small and scattering events

Image Classification of Vascular Smooth Muscle Cells

November 11, 2010
Author(s)
Michael Grasso, Ronil Mokashi , Alden A. Dima, Antonio Cardone, Kiran Bhadriraju, Anne L. Plant, Mary C. Brady, Yaacov Yesha, Yelena Yesha
The traditional method of cell microscopy can be subjective, due to observer variability, a lack of standardization, and a limited feature set. To address this challenge, we developed an image classifier using a machine learning approach. Our system was

A Microwave Study of Hydrogen-Transfer-Triggered Methyl-Group Rotation in 5-Methyltropolone

November 10, 2010
Author(s)
Vadim V. Ilyushin, Emily A. Cloessner, Yung-Ching Chou, Laura B. Picraux, Jon T. Hougen, Richard Lavrich
We present here the first experimental and theoretical study of the microwave spectrum of 5-methyltropolone, which can be visualized as a 7-membered aromatic carbon ring with a five-membered hydrogen-bonded cyclic structure at the top and a methyl group at

Changing Environmental Regulations and the Electronics Industry

November 10, 2010
Author(s)
John V. Messina, Eric D. Simmon, Kevin G. Brady
In 2008, the European Union (EU) started a major review of its new class of environmental regulations with a broad review of the Restriction of Hazardous Substances (RoHS) and the Waste Electrical and Electronic Equipment (WEEE) Directives. The RoHS/WEEE
Displaying 26151 - 26175 of 74151
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