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Displaying records 721 to 730 of 753 records.
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721. Ultralow phase noise microwave generation with an Er:fiber-based optical frequency divider
Topic: Physics
Published: 8/15/2011
Authors: Franklyn J Quinlan, Tara Michele Fortier, Matthew Steven Kirchner, Jennifer A. Taylor, Michael J. (Michael) Thorpe, Nathan D. Lemke, Andrew D Ludlow, Yanyi Jiang, Christopher W Oates, Scott A Diddams
Abstract: We present an optical frequency divider based on a 200 MHz repetition rate Er:fiber mode-locked laser that, when locked to a stable optical frequency reference, generates microwave signals with absolute phase noise that is equal to or better than cry ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908516

722. Uncertainty analysis for a high-spatial resolution single-mode fiber-optic distributed temperature sensor
Topic: Physics
Published: 11/17/2011
Authors: Shellee Dawn Dyer, Michael Tanner, Burm Baek, Robert Hadfield, Sae Woo Nam
Abstract: We demonstrate a high-accuracy distributed fiber optic temperature sensor using superconducting nanowire single-photon detectors and single photon counting techniques. Our demonstration uses inexpensive single-mode fiber at standard telecommunication ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910008

723. Uncooled, Millimeter-Scale Atomic Magnetometers with Femtotesla Sensitivity
Topic: Physics
Published: 10/26/2009
Authors: John E Kitching, Svenja A Knappe, William C. Griffith, Jan Preusser, V Gerginov, Peter D. Schwindt, Vishal Shah, Ricardo Jimenez Martinez
Abstract: We summarize recent results at NIST to develop high-performance yet highly miniaturized magnetic sensors based on atomic vapors confined in microfabricated alkali vapor cells. These sensors currently achieve sensitivities in the range of a few tens o ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903176

724. Universal Crossover Function and Non-Universal Order-Parameter Profiles for Critical Adsorption
Topic: Physics
Published: 12/1/1999
Authors: S B Kiselev, L L Lue, M Yu Belyakov
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=100707

725. Update on a Comparison of Cesium Fountain Primary Frequency Standards
Topic: Physics
Published: 7/31/2011
Author: Thomas Edward Parker
Abstract: An update to a previous long term frequency comparison of cesium fountain primary frequency standards has been made. This update covers the approximate three year interval from March 2008 to March 2011 and also includes two new standards. Also, simul ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908505

726. Use of Kirkpatrick-Baez Multilayer Optics for X-Ring Fluorescence Imaging
Topic: Physics
Published: 7/1/1998
Authors: A S Bakulin, S M Durbin, C Liu, J Erdmann, A T Macrander, Terrence J Jach
Abstract: We discuss the possibilities for using Kirkpatrick-Baez (K-B) multilayer elements to directly image the fluorescence distribution from a specimen under x-ray illumination. X-ray fluorescence would be collected by K-B elements close in contrast to th ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=831073

727. Use of Phosphor Image Plates for Measuring Intensities in Vacuum Ultraviolet Spectra
Topic: Physics
Published: 1/28/2011
Authors: Gillian Nave, Craig J Sansonetti, Csilla Szabo, John J Curry, Darren Smillie
Abstract: We describe the use of phosphor image plates for recording spectra in the vacuum ultraviolet (VUV) and for determining accurate relative and absolute intensities. We investigated the spatial uniformity, noise level, linearity of the response to VUV ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905893

728. Use of the Grand Canonical Transition-Matrix Monte Carlo Method to Model Gas Adsorption in Porous Materials
Topic: Physics
Published: 2/21/2013
Authors: Daniel W Siderius, Vincent K Shen
Abstract: We present grand canonical transition-matrix Monte Carlo (GC-TMMC) as an efficient method for simulating gas adsorption processes, with particular emphasis on subcritical gas adsorption in which capillary phase transitions are present. As in other a ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912491

729. Vibration Sensitivity of Optical Components: A Survey
Topic: Physics
Published: 7/31/2011
Authors: Archita Hati, Craig W Nelson, David Allan Howe
Abstract: We propose and demonstrate a novel technique to measure the vibration sensitivity of two-port fiber-based optical components. It uses a common-arm counter-propagating frequency-shifted interferometer that cancels the vibration induced phase noise of ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908616

730. Vibration-induced PM Noise of A Rigid Optical Fiber Spool
Topic: Physics
Published: 12/1/2008
Authors: Jennifer A. Taylor, Craig W Nelson, Archita Hati, Neil Ashby, David Allan Howe
Abstract: Oscillators operating in field applications are subject to much more strenuous environmental effects than those in the laboratory. These environmental effects, like vibration and temperature fluctuation, have a great impact on the performance of the ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901092



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