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Displaying 30651 - 30675 of 73829

Mean Recurrence Intervals of Failure Wind Loads

August 1, 2008
Author(s)
Dat Duthinh, Joseph A. Main, Amelia P. Wright, Emil Simiu
The Commentary to the ASCE Standard 7-05 states that the nominal mean recurrence interval (MRI) of the wind speed inducing the design strength is about 500 years if the specified load factor is 1.5, as in early versions of ASCE 7, and somewhat higher than

Measurement Time and Statistics for a Noise Thermometer With a Synthetic-Noise Reference

August 1, 2008
Author(s)
David R. White, Samuel Benz, J Labenski, Sae Woo Nam, Jifeng Qu, H Rogalla, Weston L. Tew
This paper describes methods for reducing the statistical uncertainty in measurements made by noise thermometers using digital cross correlators, and in particular, for thermometers using pseudorandom noise for the reference signal. First, a discrete

Microwave Characterization of Semiconductors with a Split-Cylinder Cavity

August 1, 2008
Author(s)
Billy F. Riddle, James R. Baker-Jarvis, Michael D. Janezic
In this paper we demonstrate the use of a split-cylinder cavity for characterizing semiconductors over a temperature range of 173 K (-100oC) to 373 K (+100oC) at microwave frequencies (9-30 GHz). Complex permittivity measurements of silicon (Si) and

Natural Gas Flow Calibration Service

August 1, 2008
Author(s)
Aaron N. Johnson
This document describes NIST's high pressure natural gas flow calibration service (NGFCS). Flow calibrations are conducted offsite at the Colorado Experimental Engineering Station Incorporated (CEESI) in Garner, Iowa. A parallel array of nine turbine meter

ON MATERIAL-BASED HYDROGEN STORAGE

August 1, 2008
Author(s)
Jiann C. Yang
In this short communication, an analytical framework is provided to estimate the effect of temperature on equilibrium storage pressure in a would-be situation wherein a material-based hydrogen storage system is rendered closed. Under several limited ideal

Power Loading Effects in Precision 1 Ohm Resistors

August 1, 2008
Author(s)
George R. Jones, Randolph E. Elmquist
Five manganin alloy Thomas-type 1 Ohm resistors serve as primary working standards at the National Institute of Standards and Technology (NIST) in the precision potentiometer direct current comparator (DCC) system used for special 1 Ohm customer

Procedures for the Traceability of High Resistance Standards Using a Teraohmmeter

August 1, 2008
Author(s)
Dean G. Jarrett, Marlin E. Kraft, Isabel Castro, Brett Degler, Mark Evans
The Metrology of the Ohm Project in the Quantum Electrical Metrology Division (QEMD) at the National Institute of Standards and Technology (NIST) routinely disseminates the U. S. representation of the ohm through our calibration services and measurement

Quantum Computing With Ions

August 1, 2008
Author(s)
David J. Wineland, C Monroe
This article briefly describes methods to generate entanglement and implement quantum information processing with the use of trapped ions. It is intended to give a simple introduction to the techniques involved, the status of the field and indicate future

Recommended Terminology For Microwave Radiometry

August 1, 2008
Author(s)
James P. Randa, Janne Lahtinen, Adriano Camps, A. Gasiewski, Martti Hallikainen, David Leine V, Manuel Martin-Neira, Jeff Piepmeier, Philip Rosenkranz, Christopher Ruf, James Shiue, Niels Skou
We present recommended definitions for common terms in microwave remote-sensing radiometry. Terms are grouped into three chapters: General Terminology, Real-Aperture Radiometers, and Polarimetric Radiometry. AN alphabetical index lists the terms that are

Residential Structure Separation Fire Experiments

August 1, 2008
Author(s)
Alexander Maranghides, Erik L. Johnsson
Building codes often allow structures with window openings and combustible exteriors to be built with as little as 1.8 m (6 ft) of separation between them. In a recent full-scale laboratory experiment at the National Institute of Standards and Technology

Sizing the Bacillus anthracis PA63 Channel with Nonelectrolyte Poly(ethylene glycols)

August 1, 2008
Author(s)
Brian J. Nablo, Kelly Halverson, Joseph W. Robertson, Tam Nguyen, Rekha Panchal, Rick Gussio, Sina Bavari, Oleg V. Krasilnikov, John J. Kasianowicz
Non-electrolyte polymers of poly(ethylene glycol), PEG, were used to estimate the diameter of the ion channel formed by Bacillus anthracis protective antigen 63, PA63. Based on the ability of different molecular weight PEGs to partition into the pore and

Structural Fire Response and Probable Collapse Sequence of World Trade Center Building 7 (Volume 1). Federal Building and Fire Safety Investigation of the World Trade Center Disaster (NIST NCSTAR 1-9) ***DRAFT for Public Comments***

August 1, 2008
Author(s)
Therese P. McAllister, Richard G. Gann, Jason D. Averill, John L. Gross, William L. Grosshandler, James R. Lawson, Kevin B. McGrattan, William M. Pitts, Kuldeep R. Prasad, Fahim Sadek, Harold E. Nelson
This is the primary technical report on the National Institute of Standards and Technology (NIST) investigation of the collapse of World Trade Center Building 7 (WTC 7), conducted under the National Construction Safety Team Act. The investigation

Structural Fire Response and Probable Collapse Sequence of World Trade Center Building 7 (Volume 2). Federal Building and Fire Safety Investigation of the World Trade Center Disaster (NIST NCSTAR 1-9) ***DRAFT for Public Comments***

August 1, 2008
Author(s)
Therese P. McAllister, Richard G. Gann, Jason D. Averill, John L. Gross, William L. Grosshandler, James R. Lawson, Kevin B. McGrattan, William M. Pitts, Kuldeep R. Prasad, Fahim Sadek, Harold E. Nelson
This is the primary technical report on the National Institute of Standards and Technology (NIST) investigation of the collapse of World Trade Center Building 7 (WTC 7), conducted under the National Construction Safety Team Act. The investigation

STWS: A Unified Web Service for IEEE 1451 Smart Transducers

August 1, 2008
Author(s)
Yuyin Song, Kang B. Lee
This paper describes a unified web service for the Institute of Electrical and Electronics Engineers (IEEE) 1451 smart transducers stabdards - Smart Transducer Web Services (STWS) developed at the National Institute of Standards and Technology (NIST) based

Albedo Measurements and Optical Sizing of Single Aerosol Particles

July 31, 2008
Author(s)
Todd J. Sanford, Daniel Murphy, David S. Thomson, Richard W. Fox
Aerosols play an important role in global climate change by their interactions with incoming solar radiation and outgoing longwave radiation from the planetary surface. The climate effects of aerosols depend on their scattering and absorption properties

Glycosidic Linkage Conformation of Methyl-alpha-Mannopyranoside

July 31, 2008
Author(s)
Orkid Coskuner, Denis E. Bergeron, Luis C. Rincon, Jeffrey W. Hudgens, Carlos A. Gonzalez
We study the preferred conformation of the glycosidic linkage of methyl--mannopyranoside in the gas phase and in aqueous solution. Results obtained utilizing Car Parrinello molecular dynamics (CPMD) simulations are compared to those obtained from
Displaying 30651 - 30675 of 73829
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