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Displaying 3676 - 3700 of 73898

Characterizing the effects of laser control in laser powder bed fusion on near-surface pore formation via combined analysis of in-situ melt pool monitoring and X-ray computed tomography

October 4, 2021
Author(s)
Felix Kim, Ho Yeung, Edward Garboczi
Background: Near-surface or sub-surface pores are critical to the structural integrity of additively manufactured (AM) parts, especially in fatigue failure applications. However, their formation in laser powder bed fusion is not well-understood due to the

MULTI-COLLECTOR CONFIGURATION CONSIDERATIONS AND SUBSTRATE RELATIVE SENSITIVITY FACTOR EFFECTS FOR AGE-DATING MEASUREMENTS OF PARTICLES BY LARGE GEOMETRY SECONDARY ION MASS SPECTROMETRY

October 1, 2021
Author(s)
Todd Williamson, David S. Simons, John D. Fassett
Chronometry (a.k.a age-dating, AD) of materials by bulk mass spectrometric methods is a well-established technique based on analysis protocols that have been used in geological fields and by the non-proliferation communities for many years. Recently, it

PSCR 2021: ICAM Program Update: New Documents and Path Forward

October 1, 2021
Author(s)
Bill Fisher
Last year, NIST held its first Cybersecurity for Publics Safety and First Responders workshop, with a focus on identity, credential and access management (ICAM) challenges. This year NIST is following up with new guidance on critical topic areas such as

PSCR 2021: Overhead! Cybersecurity and Public Safety UAS

October 1, 2021
Author(s)
Michael Ogata, Raymond Sheh, Randall Nichols, Teague Forren
In recent decades, Unmanned Aircraft Systems (UAS) have become vastly cheaper and more fully featured. Public safety has begun to incorporate these devices into their missions for everything from reconnaissance, to surveillance, to situational awareness

PSCR 2021: Riding the Wave of an IoT Tsunami

October 1, 2021
Author(s)
Gema Howell, Don Harriss, Kevin Gerard Brady
IoT device use in public safety has greatly benefited day to day operations by reducing response times and providing expedited, life-saving data for enhancing decision making. However, the number of connected IoT devices has grown exponentially, creating

PSCR 2021: Social Media Incident Streams

October 1, 2021
Author(s)
Ian Soboroff
Monitoring social media for public safety is incredibly challenging. The TREC Social Media Incident Streams project collects social media during emergency events, annotates and labels it for public safety use, and provides a metrics-focused environment

REFERENCE MATERIALS FOR TRACE ACTINIDE CONTENT IN PLUTONIUM OXIDE

October 1, 2021
Author(s)
Richard Essex, Lav Tandon, Cole Hexel, Amy Gaffney
Nuclear forensic analyses of plutonium (Pu) materials encountered outside nuclear safeguards control can include chemical composition, isotopic composition, and the concentration of various contaminants. Results from these measurements provide insights

Three-dimensional dipolar thermalization in a reactive molecular gas with resonant shielding

October 1, 2021
Author(s)
Jun-Ru Li, William Tobias, Kyle Matsuda, Calder Miller, Giacomo Valtolina, Luigi De Marco, Rueben Wang, John Bohn, Goulven Quemener, Jun Ye
We demonstrate suppression of the reactive loss in a gas of ultracold 40 K 87 Rb molecules in a three-dimensional geometry. The electric field-induced collisional shielding suppresses loss by two orders of magnitude while preserving elastic, long-range

Critical Capability Needs for Reduction of Transmission of SARS-CoV-2 Indoors

September 30, 2021
Author(s)
Jayne B. Morrow, Aaron Packman, Kenneth F. Martinez, Kevin V. Wymelenberg, Darla Geores, Delphine K. Farmer, Jade Mitchell, Lisa Ng, Yair Hazi, Monica Schoch-Spana, Sandra Quinn, Bill Bahnfleft, Paula Olsiewski
Coordination of efforts to assess the challenges and pain points felt by industries from around the globe working to reduce COVID-19 transmission in the indoor environment as well as innovative solutions applied to meet these challenges is mandatory

DETERMINATION OF DISTORTION CORRECTIONS FOR A FIXED LENGTH OPTICAL CAVITY PRESSURE STANDARD

September 30, 2021
Author(s)
Jacob Edmond Ricker, Jay H. Hendricks, Kevin O. Douglass, Sarah White, Sergei Syssoev
Optical gas refractometry has enabled new pressure standards to be developed based on a dual Fixed Length Optical Cavity (FLOC) system. NIST in partnership with MKS Instruments has created a portable FLOC pressure standard based gas refractivity. A key

Lessons on Return to Function After the 2018 Cook Inlet Earthquake

September 30, 2021
Author(s)
Katherine Johnson, Siamak Sattar, Christopher Segura, Steven McCabe
The magnitude 7.1 Cook Inlet Earthquake of November 2018 greatly affected Anchorage, AK area residents. Although shaking likely did not exceed the hazard level for which most newer buildings are designed, disruption to normal operations was significant due

Validation of Aerosol Dynamics in a Well-Stirred Isothermal Enclosure

September 30, 2021
Author(s)
Amy Mensch, Thomas Cleary
Modeling of aerosol dynamics in fire simulations enables predictions of the effects of soot, such as visibility and detection, and the fate of soot, such as deposition and emissions. NIST's fire modeling tool, Fire Dynamics Simulator (FDS), has implemented

Wilson loop and Wilczek-Zee phase from a non-Abelian gauge field

September 30, 2021
Author(s)
Ian Spielman, Francisco Salces Carcoba, Andika Putra, Yuchen Yue, Seiji Sugawa
Quantum states can acquire a geometric phase called the Berry phase after adiabatically traversing a closed loop, which depends on the path not the rate of motion. The Berry phase is analogous to the Aharonov–Bohm phase derived from the electromagnetic

An Analysis of an Inventory of Community Resilience Frameworks

September 29, 2021
Author(s)
Jarrod Loerzel, Maria Dillard
This NIST Data Article documents the development and analysis of an inventory of 56 community resilience frameworks. This article represents the second of three products to be released as part of the foundational work to catalog, analyze, and document

An Introduction to the Benchmarking and Publications for Non-Targeted Analysis Working Group

September 29, 2021
Author(s)
Benjamin Place, Elin Ulrich, Jonathan Challis, Alex Chao, Bowen Du, Kristin Favela, Yong-Lai Feng, Christine Fisher, Piero Gardinali, Alan Hood, Ann Knolhoff, Andrew McEachran, Sara Nason, Seth Newton, Brian Ng, Jamie Nunez, Katherine Peter, Allison Phillips, Natalia Quinete, Ryan Renslow, Jon Sobus, Eric Sussman, Benedikt Warth, Samanthi Wickramasekara, Antony Williams
Non-targeted analysis (NTA) encompasses a rapidly evolving set of mass spectrometry techniques aimed at characterizing the chemical composition of complex samples, identifying unknown compounds, and/or classifying samples, without prior knowledge regarding
Displaying 3676 - 3700 of 73898