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Search Publications

NIST Authors in Bold

Displaying 876 - 900 of 143597

A unified model of core metrological concepts

July 10, 2024
Author(s)
David W. Flater, Raghu N. Kacker, Douglas Foxvog
The definitions of core metrological terms, especially quantity, quantity value, and unit, have been the subject of years of wrangling in standards organizations. A chronic disagreement exists over whether quantities are conceptualized primarily as

Few-electron highly charged muonic Ar atoms verified by electronic K xrays

July 10, 2024
Author(s)
Takuma Okumura, Toshiyuki Azuma, Douglas Bennett, W. Bertrand (Randy) Doriese, Malcolm Durkin, Joseph Fowler, Johnathon Gard, Tadashi Hashimoto, Ryota Hayakawa, Yuto Ichinohe, Paul Indelicato, Tadaaki Isobe, Sohtaro Kanda, Daiji Kato, Miho Katsuragawa, Naritoshi Kawamura, Yasushi Kino, Nao Kominato, Yasuhiro Miyake, Kelsey Morgan, Hirofumi Noda, Galen O'Neil, Shinji Okada, Kenichi Okutsu, Nancy Paul, Carl D. Reintsema, Toshiki Sato, Dan Schmidt, Kouichiro Shimomura, Patrick Strasser, Daniel Swetz, Tadayuki Takahashi, Shinichiro Takeda, Soshi Takeshita, Motonobu Tampo, Hideyuki Tatsuno, Tong Xiao-Min, Joel Ullom, Shin Watanabe, Shinya Yamada, Takuma Yamashita
Electronic K x rays emitted by muonic Ar atoms in the gas phase were observed using a superconducting transition-edge-sensor microcalorimeter. The high-precision energy spectra provided a clear signature of the presence of muonic atoms accompanied by a few

Multi-frequency Antenna Metrology with Sparse Measurements

July 10, 2024
Author(s)
Marc Valdez, Angela Folz, Michael Wakin, Joshua Gordon
We examine different approaches for compressive sensing in broadband antenna radiation pattern measurements, a common tool in antenna metrology. We focus on spherical near-field measurements and seek improved reductions in the needed number of measurements

Preliminary Field Burns of RV Trailers with External Ignitions

July 10, 2024
Author(s)
Eric Link, Shonali Nazare, Karen Jackson, Lucy Fox, Alexander Maranghides
Two recreational vehicle (RV) travel trailers were burned outdoors at the Austin Fire Department training campus in Austin, TX. The goal of these preliminary experiments was to observe and document the burning behavior of fully furnished RV trailers and to

Metabolomics 2023 Workshop Report: Moving Toward Consensus on Best QA/QC Practices in LC-MS-Based Untargeted Metabolomics

July 9, 2024
Author(s)
Tracey Schock, Jonathan Mosley, Warwick Dunn, Julia Kuligowski, Matthew Lewis, Maria Monge, Candice Ulmer Holland, Dajana Vuckovic, Krista Zanetti
Introduction: During the Metabolomics 2023 conference, the Metabolomics Quality Assurance and Quality Control Consortium (mQACC) presented a workshop focusing on key quality assurance and quality control (QA/QC) topic categories for LC-MS-based untargeted

A Review of the Literature on Voter Verification and Ballot Review

July 8, 2024
Author(s)
Whitney Quesenbery, Suzanne Chapman, Christopher Patten, Roberto Spreggiaro, Shanee Dawkins
One of the major issues for voting systems today is whether they provide voters with a meaningful opportunity to verify their ballot before casting it. This opportunity is important in helping them vote their intent by catching errors or omissions made

Bell Sampling from Quantum Circuits

July 8, 2024
Author(s)
Dominik Hangleiter, Michael Gullans
A central challenge in the verification of quantum computers is benchmarking their performance as a whole and demonstrating their computational capabilities. In this work, we find a model of quantum computation, Bell sampling, that can be used for both of

Byproduct Formation from Portable Air Cleaners under Standard Test Conditions

July 8, 2024
Author(s)
Dustin Poppendieck, Michael Link, Rileigh Robertson
Use of air cleaners has increased due to the COVID-19 pandemic and wildfire frequency. A wide range of air cleaning technologies have been implemented in various products, although the potential of these technologies to form byproducts is largely unknown

Chemical characteristics of indoor aerosol particles and surface films

July 8, 2024
Author(s)
Rachel O'Brien, Cate Shirilla, Amy Hrdina, Emily Legaard, Kathryn Mayer, Marina Vance, Dustin Poppendieck, Delphine Farmer
Indoor surfaces and the films on them play important roles in indoor air quality due to the high surface area to volume ratios in our homes. The chemical complexity of these films can be large, and this can increase after film formation as the chemicals in

How Voters Review and Verify Ballots

July 8, 2024
Author(s)
Suzanne Chapman, Lynn Baumeister, Whitney Quesenbery, Shanee Dawkins
Qualitative research to gain deeper insights about how voters mark, review, verify, and cast their ballots. Conducted as part of the work to update the human factors—accessibility, privacy, and usability—requirements in federal voting system standards and

Impacts of Aging and Relative Humidity on Biomass Burning Smoke in an Indoor Environment

July 8, 2024
Author(s)
Marina Vance, Liora Mael, Sofie Schwink, Kathryn Mayer, Thomas Dunnington, Maximilian Schmid, Nicholas Gotlib, Andrew Martin, Dustin Poppendieck, Delphine Farmer
We studied the impacts of aging and relative humidity on simulated wildfire smoke in a test house during the Chemical Assessments of Surfaces and Air (CASA) study. We injected fresh and ozone-aged biomass burning smoke into the test house during times of

Recoil-Order and Radiative Corrections to the aCORN Experiment

July 8, 2024
Author(s)
Maynard Dewey, Jeffrey Nico, Fred Wietfeldt
The aCORN experiment measures the electron-antineutrino a-coefficient in free neutron decay. We update the previous aCORN results to include radiative and recoil corrections to first order. The corrected combined result is a = -0.10859 +/- 0.00125 (stat) +

Redetermination of the Gravitational Constant using the BIPM Torsion Balance

July 8, 2024
Author(s)
Stephan Schlamminger, Leon Chao, David B. Newell, Vincent Lee, Clive Speake
For the past several years, we have been using the torsion balance developed at the Bureau International des Poids et Mesures (BIPM) to measure the gravitational constant $G$. The most notable feature of the apparatus is that it allows the measurement of

100-km entanglement distribution with coexisting quantum and classical signals in a single fiber

July 5, 2024
Author(s)
Anouar Rahmouni, Paulina Kuo, Ya-Shian Li-Baboud, Ivan Burenkov, Yicheng Shi, Jabir Marakkarakath Vadakkepurayil, Nijil Lal Cheriya Koyyottummal, Dileep Reddy, Mheni Merzouki, Lijun Ma, Abdella Battou, Sergey Polyakov, Oliver T. Slattery, Thomas Gerrits
The development of prototype metropolitan-scale quantum networks is underway and entails transmitting quantum information via single photons through deployed optical fibers spanning several tens of kilometers. Among the major challenges in metropolitan

Functional Recovery in Modern Reinforced Concrete Buildings

July 5, 2024
Author(s)
Dustin Cook, ABBIE LIEL, Amir Safiey
In the field of structural engineering, functional recovery is a new, but non-standardized building design objective intended to improve a building's capacity to maintain or rapidly restore basic intended functions after a hazard event, such as an

Investigating the use of network analysis metrics to benchmark Industrial Symbiosis development

July 5, 2024
Author(s)
Abheek Chatterjee, Oren Minsk, Buddhika Hapuwatte, Matthew Triebe, Daniel Kietzer, Sushma Kittali-Weidner, Katherine Morris, Nehika Mathur
Circular economy (CE) aims to reduce natural resource consumption, waste generation, and related detrimental environmental, social, and economic impacts by keeping valuable materials circulating in the economy. Industrial Symbiosis (IS) contributes to CE

Liquid Deuterium Cold Source Concept for the NIST Neutron Source

July 5, 2024
Author(s)
John Jurns, Philipp Arnold, Jeremy Cook, Osman Celikten
The National Institute of Standards and Technology (NIST) Center for Neutron Research (NCNR) houses an aging reactor that serves more than 40 % of all cold neutron research needs in the U.S. First critical in 1967, the National Bureau of Standards Reactor

Morphologic alterations across three levels of biological organization following oral exposure to silver-polymer nanocomposites in Japanese medaka (Oryzias latipes)

July 5, 2024
Author(s)
Melissa Chernick, Alan Kennedy, Treye Thomas, Keana C. K. Scott, Joana Sipe, Christine Hendren, Mark Wiesner, David Hinton
Polymer nanocomposites have diverse industrial and commercial uses. While many toxicity studies have assessed the individual materials (e.g., polymer, nanomaterial) comprising nanocomposites, few have examined the potential toxicity of the nanocomposite as

Neutron Vibrational Spectroscopic Study of the 1:1 Acetylene:Ammonia Cocrystal Relevant to Titan, Saturn's Moon

July 5, 2024
Author(s)
Morgan Kramer, Trump Benjamin, Luke Daemen, Rafael Balderas-Xicohtencatl, Yongqiang Cheng, Anibal J. Ramirez-Cuesta, Craig Brown, Tomce Runcevski
The surface of Titan, Saturn's icy moon, is believed to be comprised of various molecular minerals with a great diversity in structure and composition. Under the surface conditions, 93 K and 1.45 atm, most small molecules solidify and form minerals

Genome-wide profiling of genetic variation at tandem repeat from long reads

July 4, 2024
Author(s)
Helyaneh Jam, Justin Zook, Sara Javadzadeh, Jonghun Park, Aarushi Sehgal, Melissa Gymrek
Tandem repeats are frequent across the human genome, and variation in repeat length has been linked to a variety of traits. Recent improvements in long read sequencing technologies have the potential to greatly improve TR analysis, especially for long or
Displaying 876 - 900 of 143597