Výsledky vyhledávání - "Thomas E. Parker"

Akademický článek

Optical atomic clock comparison through turbulent air

Publikováno v: Physical Review Research, Vol 2, Iss 3, p 033395 (2020)

We use frequency-comb-based optical two-way time-frequency transfer (O-TWTFT) to measure the optical frequency ratio of state-of-the-art ytterbium and strontium optical atomic clocks separated by a 1.5-km open-air link. Our free-space measurement is

Externí odkaz: https://doaj.org/article/73e8b65a1e2d4fd4b5b0a1350a920fb7

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Hydraulic fracture monitoring and optimization in unconventional completions using a high-resolution engineered fibre-optic Distributed Acoustic Sensor

Autor: C. Woerpel, R. Rufino, Mahmoud Farhadiroushan, Y. Wu, Thomas E. Parker, P. Richter

Publikováno v: First Break. 37:63-68

Understanding fracture geometry and estimating stimulated rock volume (SRV) is the goal of operators in unconventional reservoirs. The industry has long been challenged with getting a good understanding of how wells and completions interact with each

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7a89facab1aaa31c4340b6cfb54ef594
https://doi.org/10.3997/1365-2397.n0021

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Progress on optical-clock-based time scale at NIST: Simulations and preliminary real-data analysis

Autor: Andrew D. Ludlow, Stephan Schaffer, Jeff Sherman, Thomas E. Parker, Judah Levine, Daniele Nicolodi, Jian Yao, Xiaogang Zhang, Tara M. Fortier, K. Beloy, Stefania Romisch, W. F. McGrew, Holly Leopardi, R. J. Fasano, Joshua J. Savory

Publikováno v: Navigation. 65:601-608

This paper describes the recent National Institute of Standards and Technology (NIST) work on incorporating an optical clock into a time scale. We simulate a time scale composed of continuously operating commercial hydrogen masers and an optical freq

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5d201842579f3d55887bd08c3e0b7717
https://doi.org/10.1002/navi.248

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A null test of general relativity based on a long-term comparison of atomic transition frequencies

Autor: Neil Ashby, Bijunath R. Patla, Thomas E. Parker

Publikováno v: Nature Physics. 14:822-826

The local position invariance principle of general relativity stipulates that non-gravitational experiments should give outcomes that are independent of the position and orientation of the reference frames in which they have been performed. Here, we

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::947fe2bfb0b060dff0f605b52641724b
https://doi.org/10.1038/s41567-018-0156-2

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Incorporating an Optical Clock Into a Time Scale

Autor: Neil Ashby, Jian Yao, Thomas E. Parker, Judah Levine

Publikováno v: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control. 65:127-134

This paper discusses how to build a time scale with an intermittently-operated optical clock. In particular, it gives suggestions on how long and how often to run an optical clock. It also explores the benefits of having an optical clock in a time sc

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8dbbdabb593f29dfe07e5f8ef3ae6dd5
https://doi.org/10.1109/tuffc.2017.2773530

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Doppler sensitivity and its effect on transatlantic TWSTFT links

Autor: Victor S. Zhang, Shengkang Zhang, Thomas E. Parker

Publikováno v: Metrologia. 54:51-58

Some investigations have concluded that the diurnal pattern in the time comparison results of present two way satellite time and frequency transfer (TWSTFT) links may come mainly from Doppler dependent errors in the time of arrival (TOA) measurements

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3383b66c6df0399c5596b5a1380dec7c
https://doi.org/10.1088/1681-7575/54/1/51

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