U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Search Publications

NIST Authors in Bold

Displaying 27201 - 27225 of 74220

Testing the Performance of Hydrogen Sensors

September 8, 2009
Author(s)
Nathan D. Marsh, Thomas G. Cleary
The acceptance of hydrogen as a widely-available energy source will depend to some extent on the perceived and actual safe dispensing and storage of hydrogen by the general public. Reliable detection of an accidental hydrogen gas release and mitigation of

WWVB Radio Controlled Clocks: Recommended Practices for Manufacturers and Consumers (2009 edition)

September 8, 2009
Author(s)
Michael A. Lombardi, Andrew N. Novick, John P. Lowe, Matthew J. Deutch, Glenn K. Nelson, Douglas D. Sutton, William C. Yates, D. W. Hanson
Radio controlled clocks represent a true revolution in timekeeping. Clocks that synchronize to NIST radio station WWVB now number in the millions in the United States, and new sales records are being established every year. As a result, many of us are now

Building Plumbing System Decontamination - First Report on Recommendations

September 6, 2009
Author(s)
Stephen J. Treado, Mark A. Kedzierski, Stephanie S. Watson, Nicos Martys, Kenneth D. Cole
This report summarizes the measurement results and recommended procedures for responding to building plumbing system contamination incidents and restoring the water system to safe operation. The recommendations are based on analysis of the results of a

GEOMETRIC MEASUREMENT COMPARISONS FOR ROCKWELL DIAMOND INDENTERS

September 6, 2009
Author(s)
Jun-Feng Song, Samuel R. Low III, Xiaoyu A. Zheng
In the uncertainty budget of Rockwell C hardness (HRC) tests, geometric error of the Rockwell diamond indenter is a major contributor. The geometric calibration of Rockwell diamond indenters has been a key issue for Rockwell hardness standardization. The

Complete Methods Set for Scalable Ion Trap Quanum Information Processing

September 4, 2009
Author(s)
Jonathan Home, David Hanneke, John D. Jost, Jason Amini, Dietrich G. Leibfried, David J. Wineland
Building a quantum information processor capable of outperforming classical devices will require many quantum bits (qubits) and very large numbers of logical operations \cite{05Knill}. A key requirement is the faithful transport of qubits throughout the

Fundamental Equations of State for Parahydrogen, Normal Hydrogen, and Orthohydrogen

September 4, 2009
Author(s)
Jacob W. Leachman, Bryce Jacobson, Steven Penoncello, Eric Lemmon
If the potential for a boom in the global hydrogen economy is realized, there will be an increase in the need for accurate hydrogen thermodynamic property standards. Based on current and anticipated needs, new fundamental equations of state for

Overview of the TAC 2008 Update Summarization Task

September 4, 2009
Author(s)
Hoa T. Dang, Karolina K. Owczarzak
The summarization track at the Text Analysis Conference (TAC) is a direct continuation of the Document Understanding Conference (DUC) series of workshops, focused on providing common data and evaluation framework for research in automatic summarization. In

Accurate Picoscale Forces for Insitu Calibration of AFM

September 3, 2009
Author(s)
Koo-Hyun Chung, Gordon A. Shaw, Jon R. Pratt
The force sensitivity of an atomic force microscope is calibrated directly using an in situ realization of primary electrostatic forces ranging from 320 pN to 3.3 nN with accuracy of a few percent. The absolute accuracy of a common atomic force microscope

Microfabricated multispectral MRI agents: a brief overview

September 3, 2009
Author(s)
Gary Zabow
This paper provides an introductory overview on recent top-down microfabricated, as opposed to traditional bottom-up chemically synthesized, magnetic resonance imaging (MRI) contrast agents. As a specific example of the enhanced agent functionality that

Optical Properties of Rod-like Metallic Nanostructures: Insight from Theory and Experiment

September 3, 2009
Author(s)
Jinsong Duan, Kyoungweon Park, Robert I. MacCuspie, Richard A. Vaia, Ruth Pachter
In this work, we combined synthesis of metal Au and Au-Ag core-shell NRs, of high-purity and for a broad range of NR aspect ratios, with theoretical prediction, in order to gain an understanding of the optical response. Self-assembled NRs were also

Quantum Correlated Light Beams from NonDegenerate FourWave Mixing in an Atomic Vapor: the D1 and D2 Lines of ^85Rb and ^87Rb

September 3, 2009
Author(s)
Raphael C. Pooser, Alberto M. Marino, Vincent N. Boyer, Kevin M. Jones, Paul D. Lett
We present experimental results showing that quantum correlated light can be produced using non-degenerate, off-resonant, four-wave mixing (4WM) on both the D1 (795 nm) and D2 (780 nm) lines of ^85Rb and ^87Rb, extending earlier work on the D1 line of

Assessing the Measurement Uncertainty of Thermophysical Properties

September 2, 2009
Author(s)
Robert R. Zarr
A generalized approach for the expression of measurement uncertainty consistent with current international practice is presented. The approach is applicable to all kinds of quantitative measurements including measurements of thermophysical properties. A

International Comparison on Thermal Conductivity Measurements of Insulating Materials by Guarded Hot Plate

September 2, 2009
Author(s)
Bruno Hay, Leonel Lira Cortes, Benoit Doucey, Jean Remy Filtz, Nikolay Sokolov, Clark Stacey, Robert R. Zarr, Jintao Zhang
An inter-laboratory comparison on thermal conductivity measurements of insulating materials is currently organized under the auspices of the Bureau International des Poids et Mesures (BIPM). Thermal conductivity measurements are carried out by seven

Time and Frequency Users Manual

September 2, 2009
Author(s)
Michael A. Lombardi
This book is for the person who needs information about making time and frequency measurements. It is written at a level that will satisfy those with a casual interest as well as laboratory engineers and technicians who use time and frequency every day. It

Toward a standard on the wind tunnel method

September 2, 2009
Author(s)
Emil Simiu
This document is intended to provide practicing engineers and building code officials with a technical resource that (i) describes current practices for the testing of buildings and other structures in flows simulating natural winds, (ii) provides a basis
Displaying 27201 - 27225 of 74220