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Topic Area: Physics

Displaying records 1 to 10 of 705 records.
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1. WWVB Time Signal Broadcast: A New Enhanced Broadcast Format and Multi-Mode Receiver
Topic: Physics
Published: 3/14/2014
Authors: John P Lowe, Yingsi Liang, Oren Eliezer, Dinesh Rajan
Abstract: WWVB is a broadcast station, operated by the National Institute of Standards and Technology, that has been broadcasting time information to radio-controlled clocks (RCC) throughout the continental US since 1965. The transmitted information includes t ...

2. WWVB: A Half Century of Delivering Accurate Frequency and Time by Radio
Series: Journal of Research (NIST JRES)
Report Number: 119.004
Topic: Physics
Published: 3/12/2014
Authors: Michael A Lombardi, Glenn K Nelson
Abstract: In commemoration of its 50th anniversary of broadcasting from Fort Collins, Colorado, this paper provides a history of National Institute of Standards and Technology (NIST) radio station WWVB. The narrative describes the evolution of the station ...

3. A collapse of the cross-spectral function in phase noise metrology
Topic: Physics
Published: 2/25/2014
Authors: Craig W Nelson, Archita Hati, David Allan Howe
Abstract: Cross-spectral analysis is a mathematical tool for extracting the power spectral density of a correlated signal from two time series in the presence of uncorrelated interfering signals. We demonstrate and explain a set of conditions where the detect ...

4. Hyperfine structure in 229g-Th^u3+^ as a probe of the 229g-Th -> 229m-Th nuclear excitation energy
Topic: Physics
Published: 2/14/2014
Author: Kyle P Beloy
Abstract: We identify a potential means to extract the 229g-Th -> 229m-Th nuclear excitation energy from precision microwave spectroscopy of the 5F^d5/2,7/2^ hyperfine manifolds in the ion 229g-Th^u3+^. The hyperfine interaction mixes this ground fine structur ...

5. Supercontinuum generation in an on-chip silica waveguide
Topic: Physics
Published: 2/13/2014
Authors: Scott A Diddams, Dong Yoon Oh, David Sell, Hansuek Lee, Ki Youl Yang, Kerry J. Vahala
Abstract: Supercontinuum generation is demonstrated in an on-chip silica spiral waveguide by launching 180-fs pulses from an optical parametric oscillator at the center wavelength 1330 nm. With a coupled pulse energy of 2.17 nJ, the broadest spectrum in the fu ...

6. High-accuracy measurement of the black-body radiation frequency shift of the ground-state hyperfine transition in ^u133^Cs
Topic: Physics
Published: 2/7/2014
Authors: Steven R Jefferts, Thomas Patrick Heavner, Thomas Edward Parker, Jon Hardy Shirley, Elizabeth A Donley, Neil Ashby
Abstract: We report a high-accuracy direct measurement of the blackbody radiation shift (BBR) of ^u133^Cs ground state hyperfine transition. This frequency shift is one of the largest systematic frequency biases encountered in realizing the current definition ...

7. Frequency Measurement
Topic: Physics
Published: 2/3/2014
Author: Michael A Lombardi
Abstract: An overview of frequency metrology, with emphasis on estimating accuracy and stability, oscillator types, and measurement instrumentation. It describes how to measure frequency and the statistics and terminology that are used to report the results. ...

8. Head and Media Challenges for 3 Tb/in^u2^ Microwave Assisted Magnetic Recording
Topic: Physics
Published: 2/3/2014
Authors: Thomas J Silva, Justin M Shaw, Hans Toya Nembach, Mike Mallary, Kumar Srinivasan, Gerado Bertero, Dan Wolf, Christian Kaiser, Michael Chaplin, Mahendra Pakala, Leng Qunwen, Yiming Wang, Carl Elliot, Lui Francis
Abstract: A specific design for Microwave Assisted Magnetic Recording (MAMR) at about 3Tb/in^u2^ (0.47 Tb/cm^u2^ or 4.7 Pb/m^u2^) is discussed in detail to highlight the challenges of MAMR and to contrast its requirements with conventional Perpendicular Magnet ...

9. NIST Time and Frequency Bulletin
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7980-01
Topic: Physics
Published: 2/3/2014
Author: Petrina C Potts
Abstract: The Time and Frequency Bulletin provides information on performance of time scales and a variety of broadcasts (and related information) to users of the NIST services.

10. Time Measurement
Topic: Physics
Published: 2/3/2014
Author: Michael A Lombardi
Abstract: An overview of time metrology, with emphasis on time interval measurements, and time synchronization. It covers the evolution of clocks and timekeeping, time scales, the fundamentals of time measurement, and the various time transfer technique used ...

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