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Displaying 20626 - 20650 of 73960

Viscosity-ratio measurements with capillary viscometers

November 27, 2013
Author(s)
Robert F. Berg, Eric F. May, Michael R. Moldover
Viscosity-ratio measurements made with capillary viscometers exploit the accurate values of the viscosity of helium calculated ab initio. Accurate values of the argon-to-helium viscosity ratio are now used for primary acoustic gas thermometry and for the

Accurate Spring Constant Calibration for very Stiff Atomic Force Microscopy Cantilevers

November 26, 2013
Author(s)
Scott Grutzik, Richard S. Gates, Yvonne B. Gerbig, Douglas T. Smith, Robert F. Cook, Alan Zehnder
There are many atomic force microscopy (AFM) applications that rely on quantifying the force between the AFM cantilever tip and the sample. The AFM does not explicitly measure force, however, so in such cases knowledge of the cantilever stiffness is

Guidance on Fire Emergency Procedures for Emergency Stair Travel Devices

November 26, 2013
Author(s)
Erica D. Kuligowski
This document provides specific detailed guidance and recommendations on the use of emergency stair travel devices, or stair descent devices, for evacuation of persons with mobility impairments during fire emergencies in buildings. The people who would

Motionless phase stepping in X-ray phase contrast imaging with a compact source

November 26, 2013
Author(s)
Houxun Miao, Lei Chen, Eric Bennett, Nick Adamo, Andrew A. Gomella, Alexa D. Luca, Ajay Patel, Nicole Y. Morgan, Han Wen
X-ray phase-contrast imaging offers a new way to look into the internal structures of objects. At hard x-ray energies the phase shift in some materials is many times the attenuation of intensity, promising greater image details with less radiation. Grating

Prototype Phantoms for Characterization of Ultra-Low Field Magnetic Resonance Imaging

November 26, 2013
Author(s)
Michael A. Boss, John A. Mates, Sarah E. Busch, Paul SanGiorgio, Stephen E. Russek, Kai Buckenmaier, Kent D. Irwin, Hsiao-Mei Cho, Gene C. Hilton, John Clarke
Purpose: Prototype phantoms were designed, constructed, and characterized for the purpose of calibrating ultralow field magnetic resonance imaging (ULF MRI) systems. The phantoms were designed to measure spatial resolution and to quantify sensitivity to

ToF-SIMS 3D Imaging of Native and Non-Native Species within HeLa Cells

November 26, 2013
Author(s)
Jeremy Brison, Michael A. Robinson, Danielle S. Benoit, Shinichiro Muramoto, Patrick S. Stayton, David G. Castner
In this study, a non-native chemical species, bromodeoxyuridine (BrdU), was imaged within single HeLa cells using time-of-flight secondary ion mass spectrometry (ToF-SIMS). The z-axis corrected 3D images were reconstructed that accurately portray the

A View on Energy Transfer Between Cold Atoms

November 22, 2013
Author(s)
Elizabeth A. Donley
This is an invited perspective article on a paper that will appear in the same issue. The perspective describes imaging energy transfer between cold Rydberg atoms.

Nuclear Magnetic Resonance Study of Atomic Motions in A 2 B 12 H 12 (A = Na, K, Rb, Cs): Anion Reorientations and Na +} Mobility

November 22, 2013
Author(s)
Alexander V. Skripov, Olga A. Babanova, Alexei V. Soloninin, Vitalie Stavila, Kristina Verdal, Terrence J. Udovic, John J. Rush
To study the reorientational motion of icosahdral [B 12H 12] 2- anions and the translational diffusion of alkali-metal (A +) cations in A 2^B 12H 12 (A = Na, K, Rb, Cs), we have measured the 1H, 11B, and 23Na NMR spectra and spin-lattice relaxation rates

Test Generation Using Model Checking and Specification Mutation

November 22, 2013
Author(s)
Paul E. Black
Although building quality into software is paramount, professionals find that testing is necessary to assure that the system will operate as desired. Developing tests can take significant resources. In 1998 NIST showed how tests can be automatically

Wavelength Dependent UV Inactivation and DNA Damage of Adenovirus 2 as Measured by Cell Culture Infectivity and Long Range Quantitative PCR

November 22, 2013
Author(s)
Sara E. Beck, Roberto A. Rodriguez, Karl G. Linden, Thomas M. Hargy, Thomas C. Larason, Harold B. Wright
Adenovirus is regarded as the most resistant pathogen to ultraviolet (UV) disinfection due to its demonstrated resistance to monochromatic, low-pressure (LP) UV irradiation at 254 nm. This resistance has resulted in high UV dose requirements for all

Draft Final Report, National Institute of Standards and Technology (NIST) Technical Investigation of the May 22, 2011, Tornado in Joplin, Missouri (NIST NCSTAR 3) ***Draft for Public Comments***

November 21, 2013
Author(s)
Erica D. Kuligowski, Franklin T. Lombardo, Long Phan, Marc L. Levitan, David P. Jorgensen
This is the final report of the National Institute of Standards and Technology (NIST) investigation of the May 22, 2011, tornado in Joplin, Missouri, conducted under the National Construction Safety Team Act. This report describes the wind field of the

REQUIREMENTS ANALYSES TO SUPPORT A MATERIAL INFORMATION MODEL FOR SUSTAINABILITY

November 21, 2013
Author(s)
Paul W. Witherell, Arvind Harinder, Katherine C. Morris
Materials, and therefore material selections, influence the sustainable impact of a product from beginning to end-of-life. With improved access to material information, product designers can attain newfound insight into the sustainability implications of

Simulating Occupancy in The NIST Net-Zero Energy Residential Test Facility

November 21, 2013
Author(s)
Farhad Omar, Steven T. Bushby
The Net-Zero Energy Residential Test Facility (NZERTF), at the National Institute of Standards and Technology (NIST) in Gaithersburg, Maryland, is a research house that is comparable in size and aesthetic to the houses in the greater Washington DC metro

The Process of Verification and Validation of Building Fire Evacuation Models

November 21, 2013
Author(s)
Enrico Ronchi, Erica D. Kuligowski, Paul A. Reneke, Richard Peacock, Daniel Nilsson
To date, there is no International standard on the methods and tests to assess the verification and validation (V&V) of building fire evacuation models, i.e., model testers adopt inconsistent procedures or tests designed for other model uses. For instance

TOWARDS THE SYNTHESIS OF PRODUCT KNOWLEDGE ACROSS THE LIFECYCLE

November 21, 2013
Author(s)
Paul W. Witherell, Boonserm Kulvatunyou, Sudarsan Rachuri
Product lifecycle management is an important aspect of today’s industry, as it serves to facilitate information exchange and management between most, if not all, stages of a product’s existence. As exchanged product information is inevitably subjected to

Componentization in the Systems Modeling Language

November 20, 2013
Author(s)
Conrad E. Bock
This paper describes new capabilities in the Systems Modeling Language that reduce the complexity of specifying systems through componentization, and increase the range of systems that can be specified. Modelers can identify portions of components

Web Based 3D Visualization and Interaction for Whole Body Laser Scans

November 20, 2013
Author(s)
Sanford P. Ressler
A web based system that allows the user to select, sort, and measure 3D bodies using displays inside of ordinary web browsers without the use of 3D plug-ins is presented. Our system, AnthroWeb3DMeasure (AW3DM), allows the user to visually explore a set of
Displaying 20626 - 20650 of 73960
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