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Search Publications

NIST Authors in Bold

Displaying 1326 - 1350 of 143780

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

Dynamic Calibration of Instrumented Charpy Strikers

April 22, 2024
Author(s)
Akobuije Chijioke, Nicholas Vlajic, Enrico Lucon
Charpy V-notch testing of metallic materials involves application of kilonewton-range force pulses on millisecond time scales, generated by impacting the notched test specimen with a striker mounted to a swinging pendulum. In the instrumented version of

Incorporating Syncable Authenticators Into NIST SP 800-63B

April 22, 2024
Author(s)
Ryan Galluzzo, Andrew Regenscheid, David Temoshok, Connie LaSalle
This supplement to NIST Special Publication 800-63B, Authentication and Lifecycle Management, provides agencies with additional guidance on the use of authenticators that may be synced between devices.

Quantum Scattering of Icosahedron Fullerene C_60} with Noble-Gas Atoms

April 22, 2024
Author(s)
Eite Tiesinga, Jacek Klos, Svetlana Kotochigova
There exist multiple ways to cool neutral molecules. A front runner is the technique of buffer gas cooling, where momentum-changing collisions with abundant cold noble-gas atoms cool the molecules. This approach can, in principle, produce the most diverse

Towards the development of standards and performance metrics for 3D imaging systems

April 22, 2024
Author(s)
Prem Rachakonda, Kamel S. Saidi, Marek Franaszek, Helen Qiao, John Sweetser, Armin Khatoonabadi, David Dechow, Wesley Rhodes
NIST is leading and supporting multiple efforts to develop standards for 3D imaging systems for manufacturing automation applications. Many manufacturers specify the performance of their sensors in non-standard ways and offer no method to verify those

Benford's law in atomic spectra and opacity databases

April 21, 2024
Author(s)
Yuri Ralchenko, Jean-Christophe Pain
The intriguing law of anomalous numbers, also named Benford's law, states that the significant digits of data follow a logarithmic distribution favoring the smallest values. In this work, we test the compliance with this law of the atomic databases

Activity standard and calibrations for 227Th with ingrowing progeny

April 20, 2024
Author(s)
Denis E. Bergeron, Jeffrey T. Cessna, Brittany Broder, Leticia Pibida, Ryan P. Fitzgerald, Morgan DiGiorgio, Elisa Napoli, Brian E. Zimmerman
Thorium-227 was separated from its progeny and standardized for activity by the triple-to-double coincidence ratio (TDCR) method of liquid scintillation counting. Confirmatory liquid scintillation-based measurements were made using efficiency tracing with

Indium Bump Bonding: Advanced Integration Techniques for Low-Temperature Detectors and Readout

April 20, 2024
Author(s)
Tammy Lucas, John Biesecker, W.Bertrand (Randy) Doriese, Shannon Duff, Malcolm Durkin, Richard Lew, Joel Ullom, Michael Vissers, Dan Schmidt
We have examined the influence of bump shape and bonding pressure on low temperature electrical properties of indium bump connections including transition temperature, normal resistance, and superconducting critical current. We describe our test structures

Orphan high field superconductivity in non-superconducting uranium ditelluride.

April 20, 2024
Author(s)
Corey Frank, Sylvia Lewin, Gicela Saucedo Salas, Peter Czajka, Ian Hayes, Hyeok Yoon, Tristin Metz, Johnpierre Paglione, John Singleton, Nicholas Butch
Reentrant superconductivity is an uncommon phenomenon in which the destructive effects of magnetic field on superconductivity are mitigated, allowing a zero-resistance state to survive under conditions that would otherwise destroy it. Typically, the

An Introduction to Machine Learning Lifecycle Ontology and its Applications

April 19, 2024
Author(s)
Milos Drobnjakovic, Perawit Charoenwut, Ana Nikolov, Hakju Oh, Boonserm Kulvatunyou
Machine Learning (ML) adoption is on the rapid rise, with a nearly 40% compound annual growth rate over the next decade. In other words, companies will be flooded with ML models developed with different datasets and software. The ability to have

Laser cooling 88Sr to microkelvin temperature with an integrated-photonics system

April 19, 2024
Author(s)
Andrew Ferdinand, Zheng Luo, Sindhu Jammi, Zachary Newman, Grisha Spektor, Okan Koksal, Akash Rakholia, Daniel Sheredy, Parth Patel, Travis Briles, Wenqi Zhu, Martin Machai Boyd, Amit Agrawal, Scott Papp
We report on experiments generating a magneto-optical trap (MOT) of 88-strontium (88Sr) atoms at microkelvin temperature, using integrated-photonics devices. With metasurface optics integrated on a fused-silica substrate, we generate six-beam, circularly p

Merging Outcomes of SAM Applied to RGB and Depth Images in Bin Picking Applications

April 19, 2024
Author(s)
Marek Franaszek, Prem Rachakonda, Pavel Piliptchak, Kamel S. Saidi
Segmenting images containing many objects stacked in unstructured piles is a challenging and vital task in robotic bin picking applications. Objects in such images are congested and occluded but, nevertheless, must be accurately segmented to calculate

Orphan High Field Superconductivity in Non-Superconducting Uranium Ditelluride

April 19, 2024
Author(s)
Corey Frank, Sylvia Lewin, Gicela Saucedo Salas, Peter Czajka, Ian Hayes, Hyeok Yoon, Tristin Metz, Johnpierre Paglione, John Singleton, Nicholas Butch
Reentrant superconductivity is an uncommon phenomenon in which the destructive effects of magnetic field on superconductivity are mitigated, allowing a zero-resistance state to survive under conditions that would otherwise destroy it. Typically, the

Comparison of Mg-based liquid metal ion sources for scalable focused-ion-implantation doping of GaN

April 18, 2024
Author(s)
Aaron Katzenmeyer, Michael Titze, Sam Frisone, Tony Ohlhausen, Anthony Flores, Deanna Campbell, Bingjun Li, Yongqiang Wang, Jung Han, Edward Bielejec, Rachel Goldman
We compare the suitability of various magnesium-based liquid metal alloy ion sources (LMAIS) for scalable focused-ion-beam (FIB) implantation doping of GaN. We consider GaMg, MgSO4•7H2O, MgZn, AlMg, and AuMgSi alloys. Although issues of oxidation (GaMg)
Displaying 1326 - 1350 of 143780
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