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Displaying records 731 to 740 of 763 records.
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731. 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 ...

732. 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 ...

733. 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

734. 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 ...

735. 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 ...

736. 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 ...

737. 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 ...

738. 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 ...

739. 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 ...

740. Vibration-induced PM and AM noise in microwave components
Topic: Physics
Published: 10/1/2009
Authors: Archita Hati, Craig W Nelson, David Allan Howe
Abstract: The performance of microwave components is sensitive to vibrations to some extent. Among them, microwave cables and connectors, bandpass filters, mechanical phase shifters and some non-linear components are the most sensitive. The local oscillator is ...

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