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Topic Area: Physics
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Displaying records 631 to 640 of 705 records.
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631. The SIM Time Network and its Contributions to Metrology in the Americas
Topic: Physics
Published: 4/1/2009
Author: Michael A Lombardi
Abstract: The SIM Time Network (SIMTN) has been one of the great success stories of the Sistema Interamericano de Metrologia (SIM), a regional metrology organization (RMO) that includes the 34 member nations of the Organization of American States (OAS). The S ...

632. The SIM Time and Frequency Network
Topic: Physics
Published: 12/1/2008
Authors: Michael A Lombardi, Andrew N Novick, Jose M. Lopez, Francisco Jimenez, Jean-Simon Boulanger, Raymond Pelletier, Ricardo de Carvalho, Raul Solis, Carlos Donado, Harold Sanchez, Carlos Andres Quevedo, Gregory Pascoe, Daniel Perez
Abstract: The {I}Sistema Interamericano de Metrologia{/I} (SIM) consists of national metrology institutes (NMIs) located in the 34 member nations of the Organization of American States (OAS), which extends throughout North, Central, and South America, and the ...

633. The SIM time scale
Topic: Physics
Published: 4/20/2013
Authors: Michael A Lombardi, J. Mauricio Lopez-Romero, Nelida Diaz-Munoz, E. de Carlos-Lopez
Abstract: Time measurement is of great importance for science, technology and commerce. Among the seven base units of the International System (SI), the second can be realized with the smallest uncertainty, currently reaching parts in 10^u16^. Keeping track of ...

634. The evolving optical frequency comb
Topic: Physics
Published: 10/22/2010
Author: Scott A Diddams
Abstract: Much as natural historians search for the first roots of our human race, curiosity drives the laser scientist to pursue the roots of his or her own field. This is especially the case in this year where our community celebrates the 50th anniversary o ...

635. The global positioning system, relativity, and extraterrestrial navigation
Topic: Physics
Published: 4/27/2009
Author: Neil Ashby
Abstract: Relativistic effects play an important role in the performance of the Global Positioning System (GPS) and in world-wide time comparisons. The GPS has provided a model for algorithms that take relativistic effects into account. In the future explorati ...

636. The optical calcium frequency standards of PTB and NIST
Topic: Physics
Published: 11/5/2004
Authors: U Sterr, C Degenhardt, H Stoehr, Ch. Lisdat, H Schnatz, J Helmcke, F Riehle, G Wilpers, Christopher W Oates, Leo W. Hollberg
Abstract: We describe the current status of the optical calcium frequency standard with laser-cooled neutral atoms realized in two different laboratories for the purpose of developing a possible future optical atomic clock. Frequency measurements performed at ...

637. The spectroscopy of molecular clusters
Topic: Physics
Published: 1/1/1994
Authors: R E Miller, David J Nesbitt

638. The-Final-State Symmetry of Na 1s Core-shell Excitons in NaCl and NaF
Topic: Physics
Published: 7/8/2009
Authors: Eric L Shirley, K. P. Nagle, G T Seidler, T. T. Fister, J. A. Bradley, F. C. Brown
Abstract: We report measurements of the Na 1s contribution to the nonresonant inelastic x-ray scattering (NRIXS) from NaCl and NaF. Prior x-ray absorption studies have observed two pre-edge excitons in both materials. The momentum transfer-dependence (q-depe ...

639. Thermal equilibration near the critical point: Effects due to three dimensions and gravity
Topic: Physics
Published: 9/1/1993
Author: Robert F Berg
Abstract: Two calculations are presented that clarify how the density profile equilibrates near the liquid-vapor critical point. Both use the equation of heat transfer recently improved to account for the large compressibility near the critical point. Previous ...

640. Thermochemistry
Topic: Physics
Published: 12/1/1997
Author: P A O'Hare

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