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Topic Area: Physics
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Displaying records 21 to 30 of 705 records.
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21. A Microwave Study of Hydrogen-Transfer-Triggered Methyl-Group Rotation in 5-Methyltropolone
Topic: Physics
Published: 11/10/2010
Authors: Vadim V. Ilyushin, Emily A. Cloessner, Yung-Ching Chou, Laura B. Picraux, Jon Torger Hougen, Richard Lavrich
Abstract: We present here the first experimental and theoretical study of the microwave spectrum of 5-methyltropolone, which can be visualized as a 7-membered aromatic carbon ring with a five-membered hydrogen-bonded cyclic structure at the top and a methyl ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903562

22. A NIST Disciplined Oscillator
Topic: Physics
Published: 7/26/2010
Author: Michael A Lombardi
Abstract: The National Institute of Standards and Technology (NIST) now offers a service that provides customers with an oscillator locked to UTC(NIST), the United States national standard for frequency and time. A NIST disciplined oscillator (NISTDO) works by ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905719

23. A NIST Disciplined Oscillator: Delivering UTC(NIST) to the Calibration Laboratory
Topic: Physics
Published: 12/1/2010
Author: Michael A Lombardi
Abstract: The National Institute of Standards and Technology (NIST) now offers a service that provides customers with an oscillator locked to UTC(NIST), the United States national standard for frequency and time. A NIST disciplined oscillator (NISTDO) works b ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906669

24. A New Algorithm to Eliminate GPS Carrier-Phase Time Transfer Boundary Discontinuity
Topic: Physics
Published: 12/5/2013
Authors: Jian Yao, Judah Levine
Abstract: We report on a study of the Global Positioning System (GPS) carrier-phase (CP) time transfer boundary discontinuity by the use of precise point positioning (PPP) technique. We first demonstrate that the pseudorange measurement noise leads to the boun ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915028

25. A One-Kilogram Quartz Resonator as a Mass Standard
Topic: Physics
Published: 2/1/2013
Authors: David Allan Howe, J Vig
Abstract: The unit of mass, the kilogram, is the last remaining SI base unit defined by an artifactŠ [1]. This artifact, the primary mass standard, suffers from long term instabilities that are neither well understood, nor easily monitored [2]. A mass stand ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911755

26. A Polarizable Model for Ethylene Oxide
Topic: Physics
Published: 6/18/2005
Author: Raymond Dale Mountain
Abstract: A series of interaction models for ethylene oxide are developed for use in molecular simulation of the thermal properties of both the gas and liquid phases. While it is possible to develop nonpolarizable models to accurately generate either the gas ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=832056

27. A Portable Rubidium Fountain
Topic: Physics
Published: 11/15/2010
Authors: Paul David Kunz, Steven R Jefferts, Thomas Patrick Heavner
Abstract: We are developing a transportable laser-cooled rubidium (Rb) atomic fountain frequency standard. Over the last year we have built the Ramsey cavity and rubidium source oven and are preparing to assemble the physics package. We have also made numerou ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907714

28. A Regenerative Frequency Comb
Topic: Physics
Published: 1/1/2006
Authors: Huascar Ascarrunz, F L. Walls, Hati a, Craig W Nelson, David Allan Howe
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=105113

29. A Single ^u199^Hg^u+^ Ion Optical Clock
Topic: Physics
Published: 1/1/2001
Authors: James C Bergquist, Christopher W Oates, E A Curtis, Leo W. Hollberg, Robert E. Drullinger, Wayne M Itano, David J Wineland, T Udem
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=105137

30. A Spin-1/2 Optical Lattice Clock
Topic: Physics
Published: 8/7/2009
Authors: Nathan D. Lemke, Andrew D Ludlow, Zeb Barber, Tara Michele Fortier, Scott A Diddams, Yanyi Jiang, Steven R Jefferts, Thomas Patrick Heavner, Thomas Edward Parker, Christopher W Oates
Abstract: We experimentally investigate an optical clock based on ^u171^Yb (I = 1/2) atoms confined in an optical lattice. We have evaluated all known frequency shifts to the clock transition, including the density-dependent collision shift, with an uncertaint ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901526



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