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Physics

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Displaying 101 - 125 of 2573

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

Quantum Monte Carlo and density functional theory study of strain and magnetism in 2D 1T-VSe2 with charge density wave states

March 7, 2025
Author(s)
Daniel Wines, Akram Ibrahim, Nishwanth Gudibandla, Tehseen Adel, Frank Abel, Sharadh Jois, Kayahan Saritas, Jaron Krogel, Li Yin, Tom Berlijn, Aubrey Hanbicki, Gregory Stephen, Adam Friedman, Sergiy Krylyuk, Albert Davydov, Brian Donovan, Michelle Jamer, Angela Hight Walker, Kamal Choudhary, Francesca Tavazza, Can Ataca
Two-dimensional (2D) 1T-VSe2 has prompted significant interest due to the discrepancies regarding alleged ferromagnetism (FM) at room temperature, charge density wave (CDW) states and the interplay between the two. We employed a combined Diffusion Monte

Universality of extreme broadening mechanisms in some near-edge x-ray spectra

March 5, 2025
Author(s)
Terrence Jach, John Vinson, Michael Woodcox, Adrian Jonas, Katja Frenzel, Rainer Unterumsberger, Burkhard Beckhoff
Extreme broadening previously observed in certain N x-ray fluorescence lines excited near the N K-edge in nitrates has been observed in the S L x-ray fluorescence in sodium sulfate, Na2SO4. It is explained as a large imaginary self-energy corresponding to

Modulated Laser Thermal Interrogation (MLTI): A Novel In Situ Metal Powder Evaluation Technique for Laser Powder Bed Fusion

March 1, 2025
Author(s)
Sina Ghadi, Xiaobo Chen, Nicholas Tomasello, Nicholas Derimow, Srikanth Rangarajan, Guangwen Zhou, Scott Schiffres
Assessment of metal powders in powder bed additive manufacturing is crucial, as the quality of the powders significantly impacts the final printed parts. This study introduces a novel technique to characterize metal powders by analyzing changes in their

Kolmogorov turbulence in atomic Bose-Einstein condensates

February 25, 2025
Author(s)
Ian Spielman, Mingshu Zhao, Junheng Tao
We investigated turbulence in atomic Bose-Einstein condensates (BECs) using a minimally destructive, impurity injection technique analogous to particle image velocimetry in conventional fluids. Our approach transfers small regions of the BEC into a

Measurement resolution enhanced coherence for lattice fermions

February 25, 2025
Author(s)
Ian Spielman, Hilary Hurst, Yik Teoh
Weak measurement enables the extraction of targeted information from a quantum system while minimizing decoherence due to measurement backaction. However, in many-body quantum systems backaction can have unexpected effects on wavefunction collapse. We

System Vicarious Calibration for climate and global long-term operational ocean color applications

February 25, 2025
Author(s)
Giuseppe Zibordi, B. Carol Johnson, Ewa Kwiatkowska, Kenneth Voss, David Antoine, Sean William Bailey, Andrew Barnard, Brian Barnes, Agnieszka Bialek, Shuguo Chen, Susanne Craig, Constant Mazeran, FREDERIC MELIN, Jee-Eun Min, Hiroshi Murakami, Menghua Wang
System Vicarious Calibration (SVC) enhances the accuracy of satellite ocean color radiometric data products by removing the bias due to the intrinsic inaccuracies affecting both the responsivity of the space sensor and the correction for the atmospheric
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