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 13451 - 13475 of 73927

Viscosity Measurements of R32 and R410A to 350 MPa

August 1, 2017
Author(s)
Arno D. Laesecke, Scott Bair
Viscosity measurements were performed with a falling cylinder viscometer on difluoromethane (R32) and the refrigerant blend R410A (R32+R125 with 50 % by mass) at the temperatures 313.15 K, 348.15 K, and 393.15 K with pressures to 350 MPa. The measurement

APPLICATION OF A MODEL OF HYDROGEN-ASSISTED FATIGUE CRACK GROWTH IN 4130 STEEL

July 31, 2017
Author(s)
Andrew Slifka, Robert L. Amaro, Devin T. O'Connor, Benjamin E. Long, Elizabeth S. Drexler
In this work, we applied a finite element model to predict the cyclic lifetime of 4130 steel cylinders under the influence of hydrogen. This example is used to demonstrate the efficacy of a fatigue crack growth (FCG) model we have developed. The model was

COMPUTATIONAL MODELING OF HYDROGEN-ASSISTED FATIGUE CRACK GROWTH IN PIPELINE STEELS

July 31, 2017
Author(s)
Andrew Slifka, Robert L. Amaro, Elizabeth S. Drexler, Devin T. O'Connor, Benjamin E. Long
In this work we further develop a model to predict hydrogen-assisted fatigue crack growth in steel pipelines and pressure vessels. This implementation of the model is informed by finite element code, which uses an elastic-plastic constitutive model in

Using DITA to Create Security Configuration Checklists

July 31, 2017
Author(s)
Joshua Lubell
Many software tools use security configuration checklists expressed in the Extensible Configuration Checklist Description Format (XCCDF) to monitor computers and other information technology products for compliance with security policies. But XCCDF syntax

Performance Monitoring of Chilled Water Distribution Systems using HVAC-Cx

July 30, 2017
Author(s)
Natascha S. Milesi-Ferretti, Michael A. Galler, Steven T. Bushby
Automated commissioning tools facilitate an ongoing commissioning process to improve occupant comfort, ensure the persistence of correct system operation, and reduce energy consumption. These tools decrease the time and the skill level required to carry

An Analysis of Vulnerability Trends, 2008 - 2016

July 29, 2017
Author(s)
David R. Kuhn, Mohammad Raunak, Raghu N. Kacker
This analysis reviews trends within the different vulnerability types and subsidiary weaknesses, with a goal of identifying practices that may have the strongest impact on reducing vulnerabilities.

Dynamical Transition of Collective Motions in Dry Proteins

July 28, 2017
Author(s)
Zhuo Liu, Juan Huang, Madhu Sudan Tyagi, Hugh O'Neill, Qiu Zhang, Eugene Mamontov, NItin Jain, Yujie Wang, Jie Zhang, Jeremy C. Smith, Liang Hong
Water is widely assumed to be essential for protein dynamics and function. In particular, the well-documented "dynamical" transition at 200 K detected in hydrogenated proteins by incoherent neutron scattering, at which the protein changes from a rigid, non

Measurement of the Planck constant at the National Institute of Standards and Technology from 2015 to 2017

July 28, 2017
Author(s)
Darine El Haddad, Frank Seifert, Leon Chao, Antonio Possolo, David B. Newell, Jon R. Pratt, Carl J. Williams, Stephan Schlamminger
Researchers at the National Institute of Standards and Technology(NIST) estimate the value of the Planck constant as h = 6.62606994(10) x 10^-34 Js, hence with relative standard uncertainty 15.3 x 10^-9. This measurement result is based on over 17,000

Nanoscopic Dynamics of Bicontinuous Microemulsions: Effect of Membrane-Associated Protein

July 28, 2017
Author(s)
V. K. Sharma, Douglas G. Hayes, Volker S. Urban, Hugh M. O'Neill, Madhu Sudan Tyagi, Eugene Mamontov
Bicontinous Microemulsions (BυE)generally consist of nanodomains formed by surfactant in a mixture of water and oil at nearly equal proportions and are potential candidates for the solubilization and purification of membrane proteins. Here we present the

Lithographic sonication patterning of large area nanopillar forests

July 27, 2017
Author(s)
Joel C. Weber, Matthew D. Brubaker, Thomas M. Wallis, Kristine A. Bertness
This paper demonstrates a highly-scalable, material-independent method for patterning nanopillar forests known as lithographic sonication patterning. Through contact lithography, patterns with dimensions down to 3 υm were written across a 3-inch silicon

National Voluntary Laboratory Accreditation Program (NVLAP) Voting System Testing

July 27, 2017
Author(s)
Bradley W. Moore, Dana S. Leaman, John P. Wack
The 2017 edition of NIST Handbook 150-22 incorporates changes resulting from revisions to the Voluntary Voting System Guidelines (VVSG) Version 1.1, the Election Assistance Commission’s (EAC) Testing and Certification Program Manual Version 2.0, and the

New thorium-229 standard reference material

July 27, 2017
Author(s)
Richard Essex, Jacqueline L. Mann, Ross W. Williams, William S. Kinman, Amelie Hubert, Megan E. Bennett
A new reference material, preliminarily designated as SRM 3059, was characterized for 229Th molality (mol•g-1) and thorium isotope amount ratios. This SRM is intended for use in nuclear forensic analyses as an isotope dilution mass spectrometry spike. The
Displaying 13451 - 13475 of 73927
Was this page helpful?