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Displaying records 551 to 560 of 754 records.
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551. Recent Calibrations of UTC(NIST) and UTC(USNO)
Topic: Physics
Published: 11/26/2012
Authors: Victor Shufang Zhang, Thomas Edward Parker, Russell Bumgarner, Jonathan Hirschauer, Angela Mckinley, Stephen Mitchell, Ed Powers, Jim Skinner, Demetrios Matsakis
Abstract: The National Institute of Standards and Technology (NIST) and the United States Naval Observatory (USNO) use GPS common-view, carrier-phase time transfer and Two Way Satellite Time and Frequency Transfer (TWSTFT, also known as TWSTT) techniques in ou ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912837

552. Recent atomic clock comparisions at NIST
Topic: Physics
Published: 10/1/2008
Authors: Luca Lorini, Neil Ashby, Anders Brusch, Scott A Diddams, Robert E. Drullinger, Eric Eason, Tara Michele Fortier, Pat Hastings, Thomas Patrick Heavner, David Hume, Wayne M Itano, Steven R Jefferts, Nathan Reynolds Newbury, Thomas Edward Parker, Till P Rosenband, Jason Stalnaker, William C Swann, David J Wineland, James C Bergquist
Abstract: The record of atomic clock frequency comparisons at NIST over the past half-decade provides one of the tightest constraints of any present-day, temporal variations of the fundamental constants. Notably, the 6-year record of increasingly precise measu ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=842476

553. Recent experiments in trapped-ion quantum information processing at NIST
Topic: Physics
Published: 5/1/2006
Authors: J Chiaverini, Murray D Barrett, Brad Rodney Blakestad, Joseph Wright Britton, Wayne M Itano, John D. Jost, Emanuel H Knill, C. Langer, Dietrich G Leibfried, R Ozeri, Tobias Schaetz, David J Wineland
Abstract: Atomic ions confined in segmented trap arrays provide a system for quantum information processing. We report on the execution of two simple quantum algorithms, quantum error correction and the quantum Fourier transform, using this implementation. The ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50146

554. Recent experiments in trapped-ion quantum information processing at NIST
Topic: Physics
Published: 5/1/2006
Authors: J Chiaverini, Matthew P. Barrett, Brad Rodney Blakestad, Joseph Wright Britton, Wayne M Itano, John D. Jost, Emanuel H Knill, C. Langer, Dietrich G Leibfried, R Ozeri, T Schaetz, David J Wineland
Abstract: Atomic ions confined in segmented trap arrays provide a system for quantum information processing. We report on the execution of two simple quantum algorithms, quantum error correction and the quantum Fourier transform, using this implementation. The ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841893

555. Reflectance Factor Measurement Complications Due to Near Infrared Fluorescence
Topic: Physics
Published: 9/1/2010
Authors: Maria E Nadal, Carl C Miller, Clarence Joseph Zarobila
Abstract: The researchers at the National Institute of Standards and Technology (NIST) have found that the widely used orange and red color tiles unexpectedly exhibit near infrared fluorescence. An analysis of the effect this fluorescence component has on the ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903843

556. Relativistic Atomic Structure Theory for Highly-Charged Ions
Topic: Physics
Published: Date unknown
Author: Yong Sik Kim
Abstract: Theoretical methods commonly used in relativistic atomic structure theory are summarized with emphasis on applications to highly-charged ions.
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=840344

557. Relativistic Red Shift with 1 {multiply} 10^u-16^ Uncertainty at the NIST, Boulder
Topic: Physics
Published: 1/21/2000
Authors: Marc A Weiss, Neil Ashby
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=105661

558. Relativistic Valence Bond Theory and Its Application to Metastable Xe^d2^
Topic: Physics
Published: 2/1/2001
Authors: Svetlana Alexandrovna Kotochigova, Eite Tiesinga, I Tupitsyn
Abstract: We present a new version of the relativistic configuration interaction valence bond (RCIVB) method. It is designed to perform an ab initio all-electron relativistic electronic structure calculation for diatomic molecules. A nonorthogonal basis set ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=840372

559. Relativity and Optical Clocks
Topic: Physics
Published: 9/24/2010
Authors: Chin W. Chou, David Hume, Till P Rosenband, David J Wineland
Abstract: Albert Einstein's theory of relativity forced us to alter our concepts of reality. One of the more startling outcomes of the theory is that we have to give up our notions of simultaneity. This is manifest in the so-called twin paradox in which a twin ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905055

560. Relativity and Timing in X-ray Pulsar Navigation
Topic: Physics
Published: 6/5/2006
Authors: Neil Ashby, David Allan Howe
Abstract: XNAV is a technology demonstration that will use photons from X-ray pulsars for navigation and spacecraft attitude determination. This paper summarizes relativistic effects in the context of XNAV. It also characterizes the primary task in the time do ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50396



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