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Topic Area: Physics

Displaying records 41 to 50 of 762 records.
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41. 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. ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907623

42. 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 T. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914220

43. 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.
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915363

44. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907332

45. Self-Injection Locking and Phase-Locked States in Microresonator-Based Optical Frequency Combs
Topic: Physics
Published: 1/31/2014
Authors: Pascal Patrice Del'Haye, Scott B Papp, Scott A Diddams, Katja Melanie Beha
Abstract: Microresonator-based optical frequency combs have been under extensive research during the last years. However, the actual comb generation processes are still far from being understood. Different theoretical models have been proposed, however, recent ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914268

46. Optical phase-noise dynamics of Titanium:sapphire optical frequency combs
Topic: Physics
Published: 1/24/2014
Authors: Qudsia Quraishi, Scott A Diddams, Leo W. Hollberg
Abstract: Stabilized optical frequency combs (OFC) can have remarkable levels of coherence across their broad spectral bandwidth. We study the scaling of the optical noise across hundreds of nanometers of optical spectra. We measure the residual phase noise be ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914591

47. Fast and Reliable Spectral Response Measurements of PV Cells Using Light Emitting Diodes
Topic: Physics
Published: 1/1/2014
Authors: Behrang H Hamadani, John F Roller, Brian P Dougherty, Howard W Yoon
Abstract: We present a measurement system for absolute differential spectral responsivity of solar cells based on high-powered LED arrays coupled to an optical light guide capable of large area illumination. Two different measurement techniques were developed ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913952

48. Dissipative production of a maximally entangled steady state of two quantum bits
Topic: Physics
Published: 12/19/2013
Authors: John P Gaebler, Yiheng Lin, Florentin Reiter, Ting Rei Tan, Ryan Steven Bowler, Anders Sorensen, Dietrich G Leibfried, David J Wineland
Abstract: Entangled states are a key resource in fundamental quantum physics, quantum cryptography, and quantum computation [1]. To date, controlled unitary interactions applied to a quantum system, so-called "quantum gates'', have been the most widely used me ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914188

49. Absolute and relative stability of an optical frequency reference based on spectral hole burning in Eu^u3+^:Y^d2^SiO^d5^
Topic: Physics
Published: 12/6/2013
Authors: David R Leibrandt, M Thorpe, Chin W. Chou, Tara Michele Fortier, Scott A Diddams, Till P Rosenband
Abstract: We present four frequency comparison measurements designed to investigate the performance of an optical frequency reference based on spectral hole burning in Eu$^u3+^:Y^d2^SiO^d5^. The first frequency comparison, between a single unperturbed spectral ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914300

50. A New Algorithm to Eliminate GPS Carrier-Phase Time Transfer Boundary Discontinuity
Topic: Physics
Published: 12/5/2013
Authors: Jian Yao, Judah Levine
Abstract: We report on a study of the Global Positioning System (GPS) carrier-phase (CP) time transfer boundary discontinuity by the use of precise point positioning (PPP) technique. We first demonstrate that the pseudorange measurement noise leads to the boun ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915028



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