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Search Publications

NIST Authors in Bold

Displaying 22751 - 22775 of 73697

Verification of the Back-EMF Method for Piston Velocity Measurements

July 10, 2012
Author(s)
Ray Radebaugh, Michael A. Lewis, Peter E. Bradley
Linear compressors are used to drive pulse tube or Stirling cryocoolers, and they can be used as expanders in place of inertance tubes when inertance tubes cannot provide sufficient phase shifts between flow and pressure. Commercial linear compressors

A method for comparing remote optical clocks over a free-space optical link

July 9, 2012
Author(s)
William C. Swann, Fabrizio R. Giorgetta, Ian R. Coddington, Esther Baumann, Jean-Daniel Deschenes, Laura C. Sinclair, Alexander M. Zolot, Nathan R. Newbury
We demonstrate a method to compare optical clocks approaching 10 -17 uncertainties through the exchange of optical pulses from phase-locked frequency combs. We discuss results over a 120 m air path and prospects for longer distances.

Continuous-variable quantum compressed sensing

July 9, 2012
Author(s)
Yi-Kai Liu, Matthias Ohliger, Vincent Nesme, David Gross, Jens Eisert
We introduce a novel method to faithfully reconstruct unknown quantum states that are approximately low-rank, using only a few measurement settings. The method is general enough to allow for measurements from a continuous family, and is also applicable to

Power Density Rating for Embedded Resistors

July 9, 2012
Author(s)
Jan Obrzut, Jason D. Ferguson, MIchael H. Azarian
The Power Density Ratting (PDR) for Embedded Resistors test method covers procedures for the demonstration of the ability to operate the embedded device safely within nominal tolerance, at rated power, and to withstand the transient voltage waves resulting

Reference Correlation of the Thermal Conductivity of Sulfur Hexafluoride from the Triple Point to 1000 K and up to 150 MPa

July 9, 2012
Author(s)
Marc J. Assael, I.A. Koini, K.D. Antoniadis, Marcia L. Huber, Ilmutdin M. Abdulagatov, Richard A. Perkins
This paper contains new, representative reference equations for the thermal conductivity of SF6. The equations are based in part upon a body of experimental data that has been critically assessed for internal consistency and for agreement with theory

Room Temperature Acoustic Transducers for High-Temperature Thermometry

July 9, 2012
Author(s)
Dean C. Ripple, William E. Murdock, Gregory F. Strouse, Keith A. Gillis, Michael R. Moldover
We have successfully conducted highly-accurate, primary acoustic thermometry at 600 K using a sound source and a sound detector at room temperature. We describe the source, the detector, and the ducts that connected them to our cavity resonator. This

Identification of Isethionic Acid and Other Small Molecule Metabolites of Fragilariopsis cylindrus with Nuclear Magnetic Resonance

July 8, 2012
Author(s)
Dan Bearden, Arezue F. Boroujerdi, Peter A. Lee, Giacomo R. DiTullio, Michael G. Janech, Sarah B. Vied
Nuclear magnetic resonance (NMR)-spectroscopy has been used to obtain metabolic profiles of the polar diatom Fragilariopsis cylindrus, leading to the identification of a novel metabolite in this organism. Initial results from an ongoing metabolomics study

The winter time South Pole tropospheric water vapor column: Comparisons of radiosonde and recent terahertz radiometry, use of the saturated column as a proxy measurement; and inference of decadal trends

July 7, 2012
Author(s)
Richard A. Chamberlin, Erich N. Grossman
We use a fifty year record of winter time radiosonde observations at the South Pole to estimate the precipitable water vapor column (PWV) over the entire period. Humidity data from older radiosondes is of limited reliability; however, we think an

Displacement Sensor for Detecting Sub-micrometer Motion

July 6, 2012
Author(s)
Svetlana Avramov-Zamurovic1, Jae M. Yoo, Nicholas Dagalakis, Rae Duk Lee
This paper describes the design of a nano displacement sensor that detects the presence of a moving platform by using fringing electric field. Its electrodes are commercially prefabricated Teflon insulated wires. This solution provides for excellent

Traceability of high-speed electrical waveforms at NIST, NPL, and PTB

July 6, 2012
Author(s)
Paul D. Hale, Dylan F. Williams, Andrew M. Dienstfrey, Chih-Ming Wang, Jeffrey A. Jargon, David Humphreys, Matthew Harper, Heiko Fuser, Mark Bieler
Instruments for measuring high-speed waveforms typically require calibration to obtain accurate results. The national metrology institutes of the United States of America, the United Kingdom, and Germany offer measurement services based on electro-optic

Alternative Analyses of Measurements of the Planck Constant

July 5, 2012
Author(s)
Blaza Toman
We compare different methods for the adjustment of the Planck constant using recent, inconsistent data. First we discuss the popular Birge ratio method. By stating the underlying statistical model we critically assess and modify this method. We then

Propagation of Vortex Electron Wave Functions in a Magnetic Field

July 5, 2012
Author(s)
Gregg M. Gallatin, Benjamin McMorran
The physics of coherent beams of photons carrying axial orbital angular momentum (OAM) is well understood and such beams, sometimes known as vortex beams, have found applications in optics and microscopy. Recently electron beams carrying very large values
Displaying 22751 - 22775 of 73697
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