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Displaying records 11 to 20 of 790 records.
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11. International Comparisons of Network Time Protocol Servers
Topic: Physics
Published: 12/4/2014
Authors: Michael A Lombardi, Judah Levine, Jose M. Lopez, Francisco Jimenez, John Bernard, Marina Gertsvolf, Harold Sanchez, Oscar G. Fallas, Liz Catherine Hernandez Ferero, Ricardo de Carvalho, Mario Fittipaldi, Raul Solis, Franklin Espejo
Abstract: This paper describes a recently designed system that measures the time transmitted by network time protocol (NTP) servers located in North, Central, and South America. Direct measurements of the time transmitted by each server are obtained by compar ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=917539

12. Measured Ionosphere Delay Correction for Code-Based GPS Time Transfer
Topic: Physics
Published: 12/4/2014
Authors: Victor Shufang Zhang, Zhiqi Li
Abstract: Nowadays, more and more dual-frequency, multichannel receivers are used in GPS time and frequency transfer applications. Instead of using the modeled ionosphere delay correction or using the IGS ionospheric map, we can obtain the ionosphere delay cor ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=917485

13. Quantum engineering of atomic phase shifts in optical clocks
Topic: Physics
Published: 11/24/2014
Authors: Andrew D Ludlow, T Zanon-willette, S. Almonacil, E. de Clercq, Ennio Arimondo
Abstract: Quantum engineering of time-separated Raman laser pulses in three-level systems is presented to produce an ultra-narrow, optical-clock transition free from light shifts and with a significantly reduced sensitivity to laser parameter fluctuations. B ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916405

14. Adaptive and robust statistical methods for processing near-field scanning microwave microscopy images
Topic: Physics
Published: 11/23/2014
Authors: Kevin J Coakley, Samuel Berweger, Atif (Atif) Imtiaz, Thomas M Wallis, Joel C. Weber, Pavel Kabos
Abstract: Near-field scanning microwave microscopy offers great potential to facilitate characterization, development and modeling of materials. By acquiring microwave images at multiple frequencies and amplitudes (along with the other modalities) one can stud ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916227

15. Broadband Noise Limit in the Photodetection of Ultralow Jitter Optical Pulses
Topic: Physics
Published: 11/14/2014
Authors: Franklyn J Quinlan, W. Sun, Tara Michele Fortier, Jean-Daniel Deschenes, Yang Fu, Scott A Diddams, Joe Campbell
Abstract: Applications with optical atomic clocks and precision timing often require the transfer of optical frequency references to the electrical domain with extremely high fidelity. Here we examine the impact of photocarrier scattering and distributed absor ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916568

16. Tunable, stable source of femtosecond pulses near 2 {mu}m via supercontinuum of an Erbium mode-locked laser
Topic: Physics
Published: 11/7/2014
Authors: Andrew M Klose, Gabriel George Ycas, Daniel Isaiah Lutwak Maser, Scott A Diddams
Abstract: Ultrashort pulses of light in the 2 {mu}m region were generated using supercontinuum broadening from an erbium fiber system. The output of a mode-locked erbium oscillator was polarized and used as a seed for a polarization maintaining erbium fiber am ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=917279

17. A Low-Cost Time Transfer Receiver for Contributions to Coordinated Universal Time
Series: Journal of Research (NIST JRES)
Report Number: 119.024
Topic: Physics
Published: 11/6/2014
Authors: Michael A Lombardi, Andrew N Novick, Victor Shufang Zhang
Abstract: This paper describes a low-cost time transfer receiver that allows timing laboratories, including national metrology institutes and other designated institutions, to contribute data to the computation of Coordinated Universal Time (UTC). The tim ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916483

18. Fast transport of mixed-species ion chains within a Paul trap
Topic: Physics
Published: 11/6/2014
Authors: Ryan Steven Bowler, M. Palmer, John P Gaebler, Dietrich G Leibfried, J. G. Ceremuga
Abstract: We investigate the dynamics of mixed-species ion crystals during transport between spatially distinct locations in a linear Paul trap in the diabatic regime. In a general mixed-species crystal, all degrees of freedom along the direction of transport ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916362

19. Ultra-Broadband Frequency Comb Generation in Superconducting Resonators
Topic: Physics
Published: 10/30/2014
Authors: David P Pappas, Michael Robert Vissers, Martin Olof Sandberg, Jiansong Gao, Steven R Jefferts, Robert P Erickson
Abstract: Multi-octave frequency combs are generated in superconducting microresonators due to their low loss, strong Kerrlike kinetic inductance nonlinearity, and low frequency dispersion. This effect is illustrated at low frequency (60 MHz to 20 GHz) in long ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915796

20. Erratum: Thermal Expansion of Platinum and Platinum-Rhodium Alloys.
Series: Journal of Research (NIST JRES)
Report Number: 091.037erata2014
Topic: Physics
Published: 10/22/2014
Authors: Gregory F Strouse, James F. Schooley, R. E. Edsinger, M. L. Reilly
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=917429



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