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Topic Area: Physics
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Displaying records 61 to 70 of 774 records.
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61. Three-Corner Hat Analysis of the Stability of UTC and Various UTC(k)s
Topic: Physics
Published: 12/5/2013
Author: Thomas Edward Parker
Abstract: The stabilities of some local UTC time scales have recently improved dramatically with the increasing use of cesium or rubidium fountains as nearly always present frequency references. Along with time scales using maser ensembles, there are now a nu ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915030

62. Standardization of 237Np
Topic: Physics
Published: 12/4/2013
Authors: Lizbeth Laureano-Perez, Ryan P Fitzgerald, Ronald Colle
Abstract: The standardization of 237Np was investigated. The certified massic activity for 237Np was obtained by 4 liquid scintillation (LS) counting with correction for the 233Pa daughter using the CIEMAT/NIST efficiency tracing method ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913828

63. Optical Atomic Clocks
Topic: Physics
Published: 12/1/2013
Authors: Christopher W Oates, N Poli, P. Gill, G.M. Tino
Abstract: In the last ten years extraordinary results in time and frequency metrology have been demonstrated. Frequency stabilization techniques for continous wave lasers and femto-second optical frequency combs have enabled a rapid development of frequency st ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914959

64. A View on Energy Transfer Between Cold Atoms
Topic: Physics
Published: 11/22/2013
Author: Elizabeth A Donley
Abstract: This is an invited perspective article on a paper that will appear in the same issue. The perspective describes imaging energy transfer between cold Rydberg atoms.
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914960

65. Polarization Enhanced Absorption Spectroscopy for Laser Stabilization"
Topic: Physics
Published: 11/15/2013
Authors: Paul David Kunz, Thomas Patrick Heavner, Steven R Jefferts
Abstract: We demonstrate a variation of pump-probe spectroscopy that is particularly useful for laser frequency stabilization. This polarization enhanced absorption spectroscopy (POLEAS) signal provides a significant improvement in signal-to-noise ratio over s ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913956

66. Measuring the Half-Life of 111mPd
Topic: Physics
Published: 11/12/2013
Authors: Richard M. Lindstrom, Dagistan Sahin
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915178

67. Cold-atom double-lambda coherent population trapping clock
Topic: Physics
Published: 10/31/2013
Authors: Elizabeth A Donley, Francois-Xavier R. Esnault, Eric Michael Blanshan, Eugene N Ivanov, Robert E. Scholten, John E Kitching
Abstract: Miniature atomic clocks based on coherent population trapping (CPT) states in thermal atoms are emerging as an important component in many field applications, particularly where satellite frequency standards are not accessible. Cold-atom CPT clocks p ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913692

68. Detection of {Beta}-mode polarization in the cosmic microwave background with data from the south pole telescope
Topic: Physics
Published: 9/30/2013
Authors: Johannes Hubmayr, Hsiao-Mei Cho, Gene C Hilton, Kent D Irwin, Duncan Hanson
Abstract: Gravitational lensing of the cosmic microwave background generates a curl pattern in the observed polarization. This "{Beta}-mode" signal provides a measure of the projected mass distribution over the entire observable Universe and also acts as a ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914458

69. Enhanced WWVB Broadcast Format
Topic: Physics
Published: 9/30/2013
Author: John P Lowe
Abstract: Enhanced WWVB Broadcast for web site
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914904

70. Automated Control of National Time Standards via the SIM Time Scale
Topic: Physics
Published: 9/27/2013
Authors: Michael A Lombardi, J. Mauricio Lopez-Romero, Nelida Diaz-Munoz
Abstract: This paper describes a frequency and time control system developed by the Sistema Interamericano de Metrologia (SIM). Due to limited resources, some SIM national metrology institutes maintain a low-cost rubidium clock as their national time standard, ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913540



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