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Search Publications

NIST Authors in Bold

Displaying 1551 - 1575 of 73697

Skyrmion Lattice Formation and Destruction Mechanisms Probed with TR-SANS

April 30, 2024
Author(s)
W. L. N. C. Liyanage, Nan Tang, Rebecca Dally, Lizabeth J. Quigley, C. Buchanan, Guo-Jiun Shu, Nicholas Butch, Kathryn Krycka, Markus Bleuel, Julie A. Borchers, Debeer-Schmitt Lisa, Dustin Gilbert
Magnetic skyrmions are topologically protected, nanoscale whirls of the spin configuration that tend to form hexagonally ordered arrays. As a topologically non-trivial structure, the nucleation and annihilation of the skyrmion, as well as the interaction

Spatial Variation in Mercury Accumulation in Bottlenose Dolphins (Tursiops spp.) in Southeastern U.S.A.

April 30, 2024
Author(s)
Mackenzie Griffen, Colleen E. Bryan Sallee, Tara Cox, Brian Balmer, Russell Day, Laura Garcia Barcia, Antoinette Gorgone, Jeremy Kiszka, Jenny Litz, Robin Perrtree, Teri Rowles, Lori Schwacke, Randall Wells, Eric Zolman
Bottlenose dolphins (Tursiops spp.) inhabit bays, sounds, and estuaries (BSEs) throughout the southeast region of the U.S.A. and are sentinel species for human and ecosystem-level health. Dolphins are vulnerable to the bioaccumulation of contaminants

A proposal for three categories of units within the SI

April 29, 2024
Author(s)
John Lehman, Alan Migdall, Julia Scherschligt
In this letter we examine the organization of the traditional base units and defining constants established in the 2019 redefinition of the international system of units (SI). For the next redefinition of the SI, which will accompany the anticipated

Benchmark Study of Melt Pool and Keyhole Dynamics, Laser Absorption, and Porosity in Additive Manufacturing of Ti-6Al-4V

April 29, 2024
Author(s)
Arash Samaei, Joseph Leonor, zhengtao gan, Zhongsheng Sang, Xiaoyu Xie, Brian Simonds, Wing Kam Liu, Gregory Wagner
Metal 3D printing involves a multitude of operational and material parameters that exhibit intricate interdependencies, which pose challenges to real-time process optimization, monitoring, and controlling. The dynamic behavior of the laser-induced melt

Evaluating the security of CRYSTALS-Dilithium in the quantum random oracle model

April 29, 2024
Author(s)
Kelsey Jackson, Carl A. Miller, Daochen Wang
In the wake of recent progress on quantum computing hardware, the National Institute of Standards and Technology (NIST) is standardizing cryptographic protocols that are resistant to attacks by quantum adversaries. The primary digital signature scheme that

Influence of Spectral Bandwidth on the Working Curve in Vat Photopolymerization

April 29, 2024
Author(s)
Benjamin Caplins, Thomas Kolibaba, Uwe Arp, C Cameron Miller, Yuqin Zong, Dianne L. Poster, Callie Higgins, Jason Killgore
In vat photopolymerization, 3-dimensional parts are fabricated by using patterned light to spatially cure a liquid resin. One of the foundational measurements for vat photopolymerization is known as the working curve whereby the depth (i.e. thickness) of

Operando XPS for Plasma Process Monitoring: A Case Study on the Hydrogenation of Copper Oxide Confined under h-BN

April 29, 2024
Author(s)
Trey Diulus, Andrew Naclerio, J. Anibal Boscoboinik, Ashley Head, Evgheni Strelcov, Piran Kidambi, Andrei Kolmakov
We demonstrate that ambient pressure x-ray photoelectron spectroscopy (APXPS) can be used for in situ studies of dynamic changes in surface chemistry in a plasma environment. Hexagonal boron nitride (h-BN) was used in this study as a model system since it

Shifts in belowground processes along a temperate forest edge

April 29, 2024
Author(s)
Rose Abramoff, Jeffrey Warren, Jessica Harris, Sarah Ottinger, Sarah Garvey, Joy Winbourne, Andrew Reinmann, David W. Allen, Lucy Hutyra, Margaret Torn, Melanie Mayes
Forests are increasingly fragmented and as a result most forests in the United States are within 1 km of an edge. Edges change environmental conditions of the forest - especially radiation, roughness, and temperature - that can have consequences for plant

Towards a resolution of the spin alignment problem

April 29, 2024
Author(s)
Mohammad Alhejji, Emanuel Knill
Consider the problem of minimizing the entropy of a mixture of states by choosing each state subject to constraints. If the spectrum of each state is fixed, we expect that in order to reduce the entropy of the mixture, we should make the states less

VDI/VDE 2634-2 and ISO 10360-13 Performance Evaluation Tests, and Systematic Errors in Structured Light Systems

April 29, 2024
Author(s)
Octavio Icasio Hernandez, Alex Rocha De La Cruz, Balasubramanian Muralikrishnan, Vincent Lee, Wei Ren, Jose-Joel Gonzalez-Barbosa
Structured light projection systems (SLSs) are commonly used for precision dimensional measurements. These are active systems in that the projected pattern is used to establish correspondence between the projector and the camera to provide more accurate 3D

Practical Attack on All Parameters of the DME Signature Scheme

April 28, 2024
Author(s)
Pierre Briaud, Maxime Bros, Ray Perlner, Daniel Smith-Tone
DME is a multivariate scheme submitted to the call for additional signatures recently launched by NIST. Its performance is one of the best among all the candidates. The public key is constructed from the alternation of very structured linear and non-linear

AI-Based Environment Segmentation Using a Context-Aware Channel Sounder

April 26, 2024
Author(s)
Anuraag Bodi, Samuel Berweger, Raied Caromi, Jihoon Bang, Jelena Senic, Camillo Gentile
We describe how the data acquired from the camera and Lidar systems of our context-aware radio-frequency (RF) channel sounder is used to reconstruct a 3D mesh of the surrounding environment, segmented and classified into discrete objects. First, the images

Context-Aware Channel Sounder for AI-Assisted Radio-Frequency Channel Modeling

April 26, 2024
Author(s)
Camillo Gentile, Jelena Senic, Anuraag Bodi, Samuel Berweger, Raied Caromi, Nada Golmie
We describe a context-aware channel sounder that consists of three separate systems: a radio-frequency system to extract multipaths scattered from the surrounding environment in the 3D geometrical domain, a Lidar system to generate a point cloud of the

Spatial and Temporal Data Alignment from Disparate Sources for Feature Association

April 25, 2024
Author(s)
Benjamin Standfield, Eric Holterfield, Russell Waddell
Among the chief topic areas of Industry 4.0, digital thread technology offers the opportunity for increased productivity, efficiency, and traceability throughout a product's lifecycle. While the basic concept of digital thread is easy to realize by

Instrument Development for Spectroscopic Ellipsometry and Diffractometry in the EUV

April 24, 2024
Author(s)
Stephanie Moffitt, Bryan Barnes, Thomas A. Germer, Steven Grantham, Eric Shirley, Martin Sohn, Daniel Sunday, Charles S. Tarrio
Semiconductor devices are noted for ever-decreasing dimensions but now are also becoming more complex. While scanning probe microscopy can still resolve the smallest features, it does not have the throughput for high-volume characterization of full wafers

Tuning the Spontaneous Exchange Bias Effect in La1.5Sr0.5CoMnO6 with Sintering Temperature

April 24, 2024
Author(s)
C Macchiutti, J Jesus, F Carneiro, L Bufaical, Ryan Klein, Q. Zhang, M Kirkham, Craig Brown, R dos Reis, G. Perez, E. Bittar
Here, we present a study of the influence of microstructure on the magnetic properties of polycrystalline samples of the La1.5Sr0.5CoMnO6 double perovskite, with primary attention to the spontaneous exchange bias effect, a fascinating recently discovered

Dynamic acoustic optimization of pulse tube refrigerators for rapid cooldown

April 23, 2024
Author(s)
Ryan Snodgrass, Vincent Kotsubo, Scott Backhaus, Joel Ullom
Pulse tube refrigerators are a critical enabling technology for many disciplines that require low temperatures. These refrigerators dominate the total power consumption of most modern cryostats, including those that reach millikelvin temperatures using
Displaying 1551 - 1575 of 73697
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