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Topic Area: Physics

Displaying records 71 to 80 of 777 records.
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71. Enhanced WWVB Broadcast Format
Topic: Physics
Published: 9/30/2013
Author: John P Lowe
Abstract: Enhanced WWVB Broadcast for web site

72. 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, ...

73. EUV-Driven Carbonaceous Film Deposition and Its Photo-oxidation on a TiO2 Film Surface
Topic: Physics
Published: 9/23/2013
Authors: Nadir S. Faradzhev, Monica McEntee, John Yate, Shannon Bradley Hill, Thomas B Lucatorto
Abstract: We report the photo-deposition of a carbonaceous layer grown on a TiO2 thin film by EUV radiation-induced chemistry of adsorbed n-tetradecane and the subsequent photo-oxidation of this film. It is found by chemical analysis of the C layer that irradi ...

74. Magnetic-dipole lines in 3dn ions of high-Z elements: identification, diagnostic potential, and dielectronic resonances
Topic: Physics
Published: 9/23/2013
Authors: Yuri Ralchenko, John D Gillaspy, Joseph Reader, Dmitry D. Osin, John J Curry, Yuri Anatoly Podpaly
Abstract: We present a review of measurements and analyses of extreme-ultraviolet magneticdipole (M1) lines in 50-60-times ionized atoms of tungsten, hafnium, tantalum, and gold with an open 3d shell. The spectra were measured with the electron beam ion trap ...

75. Development of in-situ calibration method for current-to-voltage converters for high-accuracy SI-traceable low-DC-current measurements
Topic: Physics
Published: 9/20/2013
Authors: George P Eppeldauer, Howard W Yoon, Dean G Jarrett, Thomas C Larason
Abstract: For photocurrent measurements with low uncertainties, wide-dynamic range reference current-to-voltage converters and a new converter calibration method have been developed at the National Institute of Standards and Technology (NIST). The high feedba ...

76. The Case for Cross Disciplinary Research on Time Aware Applications, Computers and Communication Systems (TAACCS)
Topic: Physics
Published: 9/18/2013
Authors: Marc Abbott Weiss, J C Eidson, Charles Barry, L Goldin, Bob Iannucci, Edward Lee, Kevin Stanton
Abstract: A new economy built on the massive growth of endpoints on the internet will require precise and verifiable timing in ways that current systems do not support. Applications, computers and communications systems have been developed with modules and lay ...

77. Spiral Resonators for On-Chip Laser Frequency Stabilization
Topic: Physics
Published: 9/17/2013
Authors: Scott A Diddams, Hansuek Lee, Myoung=Gyun Suh, Tong Chen, Jiang Li, Kerry J. Vahala
Abstract: Frequency references are indispensable to radio, microwave, and time keeping systems, with far reaching applications in navigation, communi- cation, remote sensing, and basic science. Over the past decade there has been an optical revo- lution in tim ...

78. GPS Integrity Architecture Opportunities
Topic: Physics
Published: 9/16/2013
Authors: Marc Abbott Weiss, Calvin Miles, Karl J Kovach, John Dobyne, Karen Van Dyke
Abstract: The Global Positioning System (GPS) integrity architecture forms the basis for several GPS integrity augmentation systems, most notably, the Wide Area Augmentation System (WAAS), Receiver-based Autonomous Integrity Monitoring (RAIM) and its proposed ...

79. Quantum simulation and many-body physics with hundreds of trapped ions
Topic: Physics
Published: 9/14/2013
Authors: John J Bollinger, Joseph Wright Britton, Brian C Sawyer
Abstract: By employing forces that depend on the internal electronic state (or spin) of an atomic ion, the Coulomb potential energy of a trapped ion crystal can be modified in a spin-dependent way to mimic effective quantum spin Hamiltonians. We use simple mod ...

80. An atomic clock with 10^u-18^ instability
Topic: Physics
Published: 9/13/2013
Authors: Andrew D Ludlow, Nathan Morris Bjork Hinkley, Jeffrey A Sherman, Nathaniel Blair Phillips, Marco Schioppo, Nathan D. Lemke, Kyle P Beloy, M Pizzocaro, Christopher W Oates
Abstract: Atomic clocks have been transformational in science and technology, leading to innovations such as global positioning, advanced communications, and tests of fundamental constant variation. Next-generation optical atomic clocks can extend the capabili ...

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