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Displaying records 71 to 80 of 243 records.
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71. The water-vapor self- and water-nitrogen continuum absorption in the 1000 and 2500 cm-1 atmospheric windows
Topic: Physics
Published: 6/13/2012
Authors: Yuri I. Baranov, Walter Joseph Lafferty
Abstract: The pure water-vapor and water-nitrogen continuum absorption in the 1000 and 2500 cm-1 atmospheric windows has been studied using a 2 m base-length White-type multipass cell coupled to a BOMEM DA3- 002 FTIR spectrometer. The measurements were carr ...

72. Three-dimensional real-time tracking of nanoparticles at an oil-water interface
Topic: Physics
Published: 6/5/2012
Authors: Kan K. Du, James Alexander Liddle, Andrew J. Berglund
Abstract: We show that real-time feedback control can be used to study three-dimensional nanoparticle transport dynamics. We apply the method to study the behavior of adsorbed nanoparticles at a silicone oil-water interface in a microemulsion system over a ran ...

73. Matrix-based color measurement corrections of tristimulus colorimeters
Topic: Physics
Published: 4/20/2012
Authors: George P Eppeldauer, Z. T. Kosztyan, J. D. Schanda
Abstract: For image taking colorimetry the tristimulus technique is still the best practical method to keep the measurement time within reasonable limits. However, the achievable color measurement uncertainties for special sources can be significant because of ...

74. Significantly Improved Trapping Lifetime of Nanoparticles in an Optical Trap using Feedback Control
Topic: Physics
Published: 4/10/2012
Authors: Arvind Kumar Balijepalli, Thomas W LeBrun, Jason John Gorman
Abstract: We demonstrate an increase in trapping lifetime for optically trapped nanoparticles by more than an order of magnitude using feedback control. This has been demonstrated through simu- lation and experimental results for 100, nm gold particles and 3 ...

75. Infrared detector calibrations
Topic: Physics
Published: 3/22/2012
Authors: George P Eppeldauer, Vyacheslav B Podobedov
Abstract: An InSb working standard radiometer, first calibrated at NIST in 1999 against a cryogenic bolometer, was recently calibrated against a newly developed low-NEP pyroelectric transfer standard detector. The pyroelectric transfer standard, which can oper ...

76. Extension of the NIST spectral power-responsivity calibration service to 2500 nm
Topic: Physics
Published: 3/2/2012
Authors: George P Eppeldauer, Howard W Yoon, Jinan Zeng, Thomas C Larason, Jeanne M Houston, Vladimir Khromchenko
Abstract: The National Institute of Standards and Technology (NIST) is working to extend the upper wavelength limit of the spectral power-responsivity calibration service from 1800 nm to 2500 nm. This extension is based on extended-InGaAs (EIGA) transfer- and ...

77. CODATA Recommended Values of the Fundamental Physical Constants: 2010
Topic: Physics
Published: 3/1/2012
Authors: Peter J Mohr, Barry Norman Taylor, David B Newell
Abstract: This paper give the 2010 self-consistent set of values of the basic constants and conversion factors of physics and chemistry recommended by the Committee on Data for Science and Technology (CODATA) for international use. The 2010 adjustment takes in ...

78. Quantitative Measurements of the Size Scaling of Linear and Circular DNA in Nanofluidic Slitlike Confinement
Topic: Physics
Published: 2/14/2012
Authors: Elizabeth A Strychalski, Jon C Geist, Michael Gaitan, Laurie E Locascio, Samuel M Stavis
Abstract: Quantitative size measurements of single linear and circular DNA molecules in nanofluidic slitlike confinement are reported. A novel experimental method using DNA entropophoresis down a nanofluidic staircase implemented comprehensive variation of sl ...

79. Standardization of Broadband UV Measurements for 365 nm LED Sources
Series: Journal of Research (NIST JRES)
Report Number: 117.004
Topic: Physics
Published: 2/2/2012
Author: George P Eppeldauer
Abstract: Broadband UV measurements are analyzed when UV-A irradiance meters measure optical radiation from 365-nm sources. The CIE standardized rectangular-shape UV-A function can be realized only with large spectral mismatch errors. The spectral power-di ...

80. Fourier, Gauss, Fraunhofer, Porod and the Shape from Moments Problem
Topic: Physics
Published: 1/17/2012
Author: Gregg M. Gallatin
Abstract: We show how the Fourier transform of a shape in any number of dimensions can be simplified using Gauss' law and evaluated explicitly for polygons in two dimensions, polyhedra three dimensions, etc. We also show how this combination of Fourier and Gau ...

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