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Search Publications

NIST Authors in Bold

Displaying 1251 - 1275 of 143606

A Four-Grating Interferometer for X-Ray Multi-Contrast Imaging

March 24, 2024
Author(s)
Daniel Josell, Houxun Miao, James Williams, Jr.
Background: X-Ray multi-contrast imaging with gratings provides a practical method to detect the differential phase and dark-field contrast images in addition to the traditional X-ray absorption image in a laboratory or hospital environment. Systems have

Excited-Band Coherent Delocalization for Improved Optical Lattice Clock Performance

March 24, 2024
Author(s)
Jacob Siegel, Andrew Ludlow, Youssef Hassan, Kyle Beloy, Tanner Grogan, Chun-Chia Chen
We implement coherent delocalization as a tool for improving the two primary metrics of atomic clock performance: systematic uncertainty and instability. By decreasing atomic density with co- herent delocalization, we suppress cold-collision shifts and two

Improving the TENOR of Labeling: Re-evaluating Topic Models for Content Analysis

March 23, 2024
Author(s)
Zongxia Li, Andrew Mao, Jordan Boyd-Graber, Daniel Stephens, Emily Walpole, Alden A. Dima, Juan Fung
Topic models are a popular tool for understanding text collections, but their evaluation has been a point of contention. Automated evaluation metrics such as coherence are often used, however, their validity has been questioned for neural topic models

A case study of multi-modal, multi-institutional data management for the combinatorial materials science community

March 22, 2024
Author(s)
Sarah Allec, Eric Muckley, Nathan Johnson, Christopher Borg, Dylan Kirsch, Joshua B. Martin, Ichiro Takeuchi, Andrew Lee, James Saal, Logan Ward, Apruva Mehta
Although the convergence of high-performance computing, automation, and machine learning has significantly altered the materials design timeline, transformative advances in functional materials and acceleration of their design will require addressing the

NIST Scientific Integrity Program Annual Report

March 22, 2024
Author(s)
Anne Andrews, Justyna Zwolak
This report summarizes the findings of the National Institute of Standards and Technology Scientific Integrity Program assessment of the program for the period between 1 June 2022 and 30 September 2023. It provides an assessment of the current state of the

Visualizing 3D Morphologies and Spatial Heterogeneities of Li after Fast- Charging via In-situ Neutron Tomography

March 22, 2024
Author(s)
Maha Yusuf, Anders Kaestner, Markus Wied, Jacob LaManna, Nghia Vo, Alison Dunlop, Andrew Jansen, Bryant Polzin, Stephen Trask, Markus Strobl, Vanessa Wood, Michael Toney, Johanna Weker
Mechanistic understanding of Li plating is imperative to developing fast-charging batteries for sustainable electric vehicles. Here, we report in-situ 3D characterization of the morphology and spatial heterogeneities of Li plating using neutron micro

Atomic and Molecular Databases Open Science for a sustainable world

March 19, 2024
Author(s)
Yuri Ralchenko, Marie-Lise Dubernet, Bruce Berriman, Paul Barklem, K Choi, Adam Foster, Iouli Gordon, Christian Hill, J Kim, DH Kwon, Harold Linnartz, Farid Salama, Hanna Shmagun, P Schilke, D Seo, J Shim, S Shin, Mi-Yong Song, Jonathan Tennyson, Charlotte VASTEL
The building of online atomic and molecular databases for astrophysics and for other research fields started with the beginning of the internet. These databases have encompassed different forms: databases of individual research groups exposing their own

Clifford-Deformed Surface Codes

March 19, 2024
Author(s)
Arpit Dua, Aleksander Kubica, Liang Jiang, Steven Flammia, Michael Gullans
Kitaev's toric/surface code and its numerous variants provide promising approaches to practi- cal quantum error correction (QEC). As recently discovered, a careful choice of the code variant and lattice layout can dramatically reduce logical error rate for

Legacy of Charlotte Moore Sitterly in the Internet Age

March 19, 2024
Author(s)
Alexander Kramida
Most (yet not all) results of atomic physics research of Charlotte Moore Sitterly (CMS), which was closely connected to astrophysics, are now incorporated in online databases, one of which is the Atomic Spectra Database of the National Institute of

Multi-harmonic near-infrared-ultraviolet dual-comb spectrometer

March 19, 2024
Author(s)
Kristina Chang, Daniel Lesko, Carter Mashburn, Peter Chang, Eugene Tsao, Alexander Lind, Scott Diddams
Dual-comb spectroscopy in the ultraviolet (UV) and visible would enable broad bandwidth electronic spectroscopy with unprecedented frequency resolution. However, there are significant challenges in generation, detection, and processing of dual-comb data

Precision Bounds on Continuous-Variable State Tomography Using Classical Shadows

March 18, 2024
Author(s)
Srilekha Gandhari, Victor Albert, Thomas Gerrits, Jacob Taylor, Michael Gullans
Shadow tomography is a framework for constructing succinct descriptions of quantum states, called classical shadows, with powerful methods to bound the estimators used. Classical shadows are well-studied in the discrete-variable case, which consists of sta

Results of an Interlaboratory Study on the Working Curve in Vat Photopolymerization

March 18, 2024
Author(s)
Thomas Kolibaba, Jason Killgore, Benjamin Caplins, Callie Higgins, Uwe Arp, C Cameron Miller, Yuqin Zong, Dianne L. Poster
The working curve informs resin properties and print parameters for stereolithography, digital light processing, and other photopolymer additive manufacturing (PAM) technologies. First demonstrated in 1992, the working curve measurement of cure depth vs

Traceable localization enables accurate integration of quantum emitters and photonic structures with high yield

March 18, 2024
Author(s)
Craig R. Copeland, Adam L. Pintar, Ronald G. Dixson, Ashish Chanana, Kartik Srinivasan, Daron Westly, Robert Ilic, Marcelo Davanco, Samuel M. Stavis
In a popular integration process for quantum information technologies, localization microscopy of quantum emitters guides lithographic placement of photonic structures. However, a complex coupling of microscopy and lithography errors degrades registration

Rapid Automated Antenna Alignment on Robotic Antenna Ranges

March 17, 2024
Author(s)
Benjamin Moser, Joshua Gordon
We present methods to automate AUT-probe alignment on a robotic antenna range using iterative fitting methods. Data collected during pose refinement is used to characterize offsets to the robot motion frame and the end effector measurement frame with

National Institute on Drug Abuse Clinical Trials Network Meeting Report: Managing Patients Exposed to Xylazine-Adulterated Opioids in Emergency, Hospital and Addiction Care Settings

March 16, 2024
Author(s)
Jeanmarie Perrone, Rachel Haroz, Joseph D'Orazio, Giacomo Gianotti, Jennifer Love, Matthew Salzman, Margaret Lowenstein, Ashish Thakar, Stephanie Klipp, Lisa Rae, Megan Reed, Edward Sisco, Rachel Wightman, Lewis Nelson
Used as a veterinary sedative and not approved for human use, xylazine has been increasingly linked with opioid overdose deaths in the United States. A growing number of people have been exposed to xylazine in the illicit opioid supply (especially fentanyl

Assessing Composite Structure in Metal-Organic Framework-Polymer Mixed-Matrix Membranes

March 15, 2024
Author(s)
Avery Baumann, Peter Beaucage, Richard Vallery, David Gidley, Ryan Nieuwendaal, Chad R. Snyder, Jan Ilavsky, Fu Chen, Christopher Stafford, Christopher Soles
Metal-organic frameworks (MOFs) are renowned for their tunable structure, porosity, and internal chemistry with demonstrated applications in molecular separations, storage, and conversion. While they are widely usable, the powdery characteristics of MOF

A multi-edge study: investigating Co oxidation states of pristine LiNixMnyCo1-x-yO2 cathode materials by high energy-resolution X-ray spectrometry

March 14, 2024
Author(s)
Karina Bzheumikhova, Claudia Zech, Kai Schuler, John Vinson, Yves Kayser, Burkhard Beckhoff
The investigation of Co oxidation states in pristine LiNixMnyCo1−x−yO2 (NMC) cathodes (NMC111, NMC622, NMC811) has been a subject of ongoing debate, with conflicting findings in the literature. In this study, we present a novel and comprehensive approach
Displaying 1251 - 1275 of 143606