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NIST Authors in Bold

Displaying 126 - 150 of 319

Trapped-ion optical atomic clocks at the quantum limits

January 31, 2017
Author(s)
David R. Leibrandt, Samuel M. Brewer, Jwo-Sy Chen, Aaron M. Hankin, David B. Hume, David J. Wineland, Chin-Wen Chou
Frequency and its inverse, time, are the most accurately measured quantities. Historically, improvements in the accuracy of clocks have enabled advances in navigation, communication, and science. Since 1967, the definition of the SI second has been based

Intertwined Charge and Spin Density Waves in a Topological Kagome Material

July 22, 2024
Author(s)
Y. Chen, Jonathan N. Gaudet, G. Marcus, T. Nomoto, T. Chen, T. Tomita, M. Ikhlas, H. Suzuki, Yang Zhao, Wangchun Chen, J. Strempfer, R. Arita, S. Nakatsuji, Collin L. Broholm
… locking to commensurate values of kβ = 1 12 c∗ and kχ = 5 48 c∗ at low T. Density functional theory indicates this …

Under-reporting of greenhouse gas emissions in U.S. cities

February 2, 2021
Author(s)
Kimberly Mueller, Kevin R. Gurney, Thomas Lauvaux, Geoffrey Roest, Jianming Liang, Yang Song
… consistent with atmospheric measurements, is compared to 48 U.S. city SRIs. We find a mean relative difference (RD) of +18.5% (Vulcan > SRIs) with 77% of cities reporting fewer …

In-situ Stress Measurements During Cobalt Electrodeposition on (111)-Textured Au

April 14, 2016
Author(s)
Gery R. Stafford, Matthew R. Fayette, Ugo Bertocci
Cantilever curvature was used to examine stress generation during the electrodeposition of Co from 0.1 M NaClO4 + 0.001 M Co(ClO4)2 (pH = 4.8) in films measuring less than 100 nm in thickness. The stress-thickness product showed a -0.2 N/m compression in

Conclusive quantum steering with superconducting transition-edge sensors

January 10, 2012
Author(s)
Devin H. Smith, Marcelo de Almeida, Gillett Geoff, Branciard Cyril, Allesandro Fedrizzi, Weinhold J. Till, Adriana Lita, Brice R. Calkins, Thomas Gerrits, Wiseman H, Sae Woo Nam, Andrew G. White
… with the minimal number of measurement settings by 48 s.d.s. Our results provide a clear path to practical …

CAVITY OPTOMECHANICAL SENSORS

June 5, 2011
Author(s)
Houxun H. Miao, Kartik A. Srinivasan, Matthew T. Rakher, Marcelo I. Davanco, Vladimir A. Aksyuk
We report a novel type of fully integrated optomechanical sensor and demonstrate high sensitivity mechanical displacement measurements on chip. We sense the motion of micro and nano-mechanical devices by near field coupling them to high quality factor

Low-Temperature Elastic Coefficients of Polycrystalline Indium

November 1, 1997
Author(s)
K Sudook, H M. Ledbetter
… high at 0.45, just below the theoretical upper bound of 0.5. Using a Marz composite oscillator, we measured the … = 2.68, that agreed well with the specific-heat value, γ=2.48 and the shock-wave value, γ=2.24. …

Spectrum and Energy Levels of the Nd 4+ Free Ion (Nd V)

October 12, 2021
Author(s)
Ali Meftah, J-F Wyart, Jocelyne Sinzelle, Wan-U Lydia Tchang-Brillet, Norbert Champion, Nissan Spector, J Sugar
… 4f5d, 4f6s and 4f6p (except for 4f^2^1 S_0). Altogether, 48 known levels classify about 160 lines. Their theoretical … interactions with the core-excited configurations 5p^5 4f^3 and 5p^5 4f^2 5d are discussed. Intensities derived from phosphor …

Cryogenic microwave loss in epitaxial Al/GaAs/Al trilayers for superconducting circuits

January 14, 2021
Author(s)
Corey Rae McRae, A. McFadden, Ruichen Zhao, Haozhi Wang, Junling Long, Tongyu Zhao, Sungoh Park, Mustafa Bal, Christopher J. Palmstrom, David P. Pappas
… The power-independent loss of the device is (4.8±0.1)×10−5, and the resonator-induced intrinsic TLS loss is (6.4±0.2)×10−5. Dielectric loss extraction is used to determine a lower … bound of the intrinsic TLS loss of the trilayer of 7.2×10−5. The unusually high power-independent loss is attributed to …

In situ X-ray scattering studies of the influence of an additive on the formation of a low-bandgap bulk- heterojunction

February 21, 2017
Author(s)
Felicia A. Bokel, Lee J. Richter, Sebastian Engmann, Andrew Herzing, Brian A. Collins, Hyun W. Ro, Dean DeLongchamp
The evolution of the morphology of a high-efficiency, blade-coated, organic-photovoltaic (OPV) active layer containing the low band-gap polymer poly[(4,8-bis[5-(2-ethylhexyl)thiophene-2-yl]benzo[1,2-b:4,5-b']dithiophene)-2,6-diyl-alt-(4-(2-ethylhexanoyl)

Quantum Electromechanics on Silicon Nitride Nanomembranes

August 3, 2016
Author(s)
Johannes Fink, Mahmoud Kalaee, Alessandro Pitanti, Richard Norte, Lukas Heinzle, Marcelo I. Davanco, Kartik Srinivasan, Oskar Painter
… an electromechanical vacuum coupling rate of g0/2pi = 41.5 Hz to the low frequency (4.48 MHz) global beam motion of a patterned phononic crystal …

FATIGUE CRACK GROWTH OF TWO PIPELINE STEELS IN A PRESSURIZED HYDROGEN ENVIRONMENT

October 22, 2013
Author(s)
Andrew J. Slifka, Elizabeth S. Drexler, Nicholas Nanninga, Yaakov Levy, Joseph D. McColskey, Robert L. Amaro
… hydrogen gas. All tests were run at (load ratio) R = 0.5 and a frequency of 1 Hz, except for one test on X100, run … conducted at hydrogen pressures of 1.7 MPa, 7 MPa, 21 MPa, 48 MPa. Fatigue crack growth rates for both X100 and X52 were …
Displaying 126 - 150 of 319
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