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Displaying 101 - 125 of 2584

Microstructure effects on the fracture surface resistance of base metal in line pipe steels in high pressure H2 gas

April 29, 2025
Author(s)
Andrew LeBoeuf, Santigopal Samanta, Joseph Ronevich, Christopher San Marchi, Zachary Buck, Matthew Connolly, Lawrence Cho, Kip Findley
Cost-effective transportation of gaseous hydrogen requires the use of long-distance low-carbon steel pipeline networks. Employing higher strength (X65-X70) grades can allow for economic viability by enabling operation at higher pressures. While higher

Dynamically generated concatenated codes and their phase diagrams

April 24, 2025
Author(s)
Grace Sommers, David Huse, Michael Gullans
We formulate code concatenation as the action of a unitary quantum circuit on an expanding tree geometry and find that for certain classes of gates, applied identically at each node, a binary tree circuit encodes a single logical qubit with code distance

Ellipsometry in the EUV Regime

April 24, 2025
Author(s)
Aaron Chew, Bryan Barnes, Eric Shirley, Thomas Germer
We propose and analyze the sensitivity of an ellipsometer that uses extreme ultraviolet (EUV) light from the synchrotron SURF-III. The ellipsometer employs a four-mirror geometry to control polarization, as documented in the associated patent. With a

Compact Blackbody Radiation Atomic Sensor: Measuring Temperature using Optically Excited Atoms in Vapor Cells

April 17, 2025
Author(s)
David La Mantia, Mingxin Lei, Nikunjkumar Prajapati, Noah Schlossberger, Matthew Simons, Christopher Holloway, Julia Scherschligt, Stephen Eckel, Eric Norrgard
We demonstrate a blackbody radiation thermometer based on optically excited rubidium atoms in a vapor cell. Operating as a calibrated contact thermometer from 308K to 343 K, we realize temperature uncertainty as low as 0.04 %, and statistical temperature

Charge-exchange processes in EBIT: implications for spectral analysis of few-electron Fe ions

April 16, 2025
Author(s)
Yang Yang, FNU Dipti, Amy Gall, Nancy Brickhouse, Hunter Staiger, Galen O'Neil, Paul Szypryt, Adam Foster, David Schultz, Aung Naing, Joseph Tan, Daniel Swetz, Michael Fogle, Randall Smith, Yuri Ralchenko, Endre Takacs
Charge-exchange recombination with neutral atoms significantly influences the ionization balance in electron beam ion traps (EBIT) because its cross section is relatively large compared to cross sections of electron collision induced processes. Modeling

NIST Time and Frequency Bulletin

April 7, 2025
Author(s)
Kelsey Rodriguez
The Time and Frequency Bulletin provides information on performance of time scales and a variety of broadcasts (and related information) to users of the NIST services.

METROLOGY FOR MRI: THE FIELD YOU'VE NEVER HEARD OF

March 19, 2025
Author(s)
Kathryn Keenan, Stephen Russek, Matt Hall
Quantitative MRI has been an active area of research for decades and has produced a huge range of approaches with enormous potential for patient benefit. In many cases, however, there are challenges with reproducibility which has hampered clinical

Detection of fractional quantum Hall states by entropy-sensitive measurements

March 17, 2025
Author(s)
Nishat Sultana, Robert Rienstra, K Watanabe, T Taniguchi, Joseph Stroscio, Nikolai Zhitenev, D Feldman, Fereshte Ghahari Kermani
Measurements of the thermopower of a clean two-dimensional electron system is directly proportional to the entropy per charge carrier1 which can probe strongly interacting quantum systems ranging from black holes2 to the fractional quantum Hall effect

Measurements of diffusion coefficients for rubidium--inert gas mixtures using coherent scattering from optically pumped population gratings

March 12, 2025
Author(s)
Alex Pouliot, E. Chomen-Ramos, G. Carlse, T. Vacheresse, J. Randhawa, L. Marmet, A. Kumarakrishnan, Jacek Klos, Eite Tiesinga
We present comprehensive determinations of diffusion coefficients $D$ at $T=24$ $\degree$C for trace amounts of naturally abundant Rb atoms in inert, naturally abundant He, Ne, N$_2$, Ar, Kr, and Xe buffer gases using a single measurement technique. They
Displaying 101 - 125 of 2584
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