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Displaying records 51 to 60 of 731 records.
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51. A new algorithm for clock weights for the SIM time scale
Topic: Physics
Published: 5/24/2012
Authors: Michael A Lombardi, J. Mauricio Lopez-Romero, Nelida Diaz-Munoz, E. de Carlos-Lopez
Abstract: A time and frequency comparison system has been developed for the Sistema Interamericano de Metrologia (SIM) region in order to compare in real time the time references maintained at the SIM national metrology institutes (NMIs). Since January 2010 a ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911482

52. A review of time and frequency transfer methods
Topic: Physics
Published: 12/5/2008
Author: Judah Levine
Abstract: I will discuss three methods of transmitting time and frequency information: one-way, two-way and common-view. I will describe the advantages and limitations of the different methods including ncertainty estimates for systems that are based on them. ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=842514

53. A simplified optical lattice clock
Topic: Physics
Published: 4/2/2009
Authors: N Poli, M.G. Tarallo, M. Schioppo, A. Alberti, Giorgio Ferrari, V. Ivanov, Christopher W Oates, G.M. Tino
Abstract: While existing optical lattice clocks demonstrate a high level of performance, they remain complex experimental devices. In order to address a wider range of applications including those requiring transportable devices, it will be necessary to simp ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901149

54. A single-ion optical clock with high accuracy
Topic: Physics
Published: 7/14/2006
Authors: W Oskay, Scott A Diddams, Elizabeth A Donley, Tara Michele Fortier, Thomas Patrick Heavner, Leo W. Hollberg, Wayne M Itano, Steven R Jefferts, M J. Jensen, Kyoungsik Kim, F Levi, Thomas Edward Parker, James C Bergquist
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841942

55. Abraham's Force on a Highly Dispersive Medium
Topic: Physics
Published: Date unknown
Authors: Paul D Lett, L Wang
Abstract: We consider the radiation force on highly dispersive media. In doing so we reconsider an experiment proposed to measure the Abraham force term in the stress-energy tensor at optical frequencies by measuring the displacement of a transparent dielectr ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=840670

56. Absolute Ag108m Characterization Based on Gamma-gamma Coincident Detection by Two Nal(T1) Detectors
Topic: Physics
Published: 12/4/2009
Author: Peter Volkovitsky
Abstract: A two-dimensional analysis of three coincident gammas in Ag108m decay, detected by two Nal(T1) scintillation detectors, allows a direct measurement of the source activity. A modification of Eldridge-Crowther formulas derived originally for 125I was ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902847

57. Absolute Co-60 characterization based on gamma-gamma coincident detection by two Nal(Tl) detectors
Topic: Physics
Published: 7/1/2009
Authors: Peter Volkovitsky, P. Naudus
Abstract: A new modification of gamma-gamma coincident activity measurement method was used for characterization of Co-60. Two-dimensional analysis of coincident events allows carefully calculating the fraction of Compton scattered gammas for each of two gamm ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=900199

58. Absolute Radiometers, in Experimental Methods in the Physical Sciences, ed. by A.C. Parr, R.U. Datla and J.L. Gardner
Topic: Physics
Published: 1/1/2005
Authors: N P Fox, Joseph Paul Rice
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=104466

59. Absolute absorption and dispersion of a rubidium vapour in the hyperfine Paschen-Back regime
Topic: Physics
Published: 10/4/2012
Authors: Svenja A Knappe, L. Weller, K.S. Kleinbach, M.A. Zentile, C.S. Adams, I.G. Hughes
Abstract: Here we report on measurements of the absolute absorption and dispersion properties of an isotopically pure 87Rb vapour for magnetic fields up to and including 0.6 T. We discuss the various regimes which arise when the hyperfine and Zeeman interactio ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911987

60. Absolute and relative gravity measurements at Hannover and Potsdam in the period 1988-1990
Topic: Physics
Published: 1/1/1991
Authors: W Torge, R H Roder, I Timmen, H Kautzleben, Cl Elstner, J E. Faller
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=106499



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