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Author (Last Name): johnson
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Displaying records 191 to 200 of 440 records.
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191. Modeling Distributed Kinetics in Isolated Semiconductor Quantum Dots
Published: 3/1/2003
Authors: M Kuno, D P Fromm, S T Johnson, Alan Gallagher, David J Nesbitt
Abstract: tailed modeling of recently observed nonexponential fluorescence intermittency in colloidal semiconductor quantum dots (QDs) is presented. In particular, experiments have shown that both on-time and off-time probability densities generated from sin ...

192. Radiometric Characterization and Absolute Calibration of the Marine Optical System (MOS) Bench Unit
Published: 3/1/2003
Authors: C Habauzit, Steven W Brown, Keith R Lykke, Bettye C Johnson, M Feinholz, M Yarbrough, D K Clark
Abstract: The Marine Optical Spectrograph (MOS) is a dual CCD-based spectrograph system developed for in-water measurements of down-welling solar irradiance, {Epsilon}^dd^, and up-welling radiance, L^du^. These measurements are currently used in the calibratio ...

193. Uncertainty Budgets For Realisation of Scales By Radiation Thermometry
Published: 3/1/2003
Authors: J Fischer, M Battuello, M Sadli, M Ballico, S N Park, P Saunders, Y Zundong, Bettye C Johnson, E Van der Ham, W Li, F Sakuma, Graham Machin, N Fox, S Ugur, M Matveyev
Abstract: Some recent international comparisons and the preliminary results of the key comparison CCT-K5 evidenced that the realisation of theITS-90 above the freezing point of silver and its dissemination with tungsten strip lamps may be less straightforward ...

194. Comparison of Cryogenic Radiometry and Thermal Radiometry Calibrations at NIST Using Multichannel Filter Raidometers
Published: 2/1/2003
Authors: Bettye C Johnson, Steven W Brown, Keith R Lykke, Charles E Gibson, G Fargion, G Meister, S B. Hooker, B L Markham, James J. Butler
Abstract: Comparison of independent measurement results allows an assessment of the accuracy of the underlying methods. In this work, four multichannel filter radiometers were calibrated using tunable laser-illuminated and lamp-illuminated integrating sphere ...

195. Design and Uncertainty Analysis for a PVTt Gas Flow Standard
Series: Journal of Research (NIST JRES)
Published: 2/1/2003
Authors: John D Wright, Aaron N Johnson, Michael R Moldover
Abstract: A new pressure, volume, temperature, and time (PVTt) primary gas flow standard has been constructed at the National Institute of Standards and Technology with an expanded uncertainty of between 0.02 % and 0.05 % (k = 2). The standard covers a flow ra ...

196. Simbad A Calibration Using a Laser Based Facility and Comparison With Previous Techniques
Published: 2/1/2003
Authors: N Souaidia, Steven W Brown, Bettye C Johnson
Abstract: Two multi-channel filter radiometers were calibrated using three different techniques: against a lamp-illuminated integrating sphere source, against a laser-illuminated integrating sphere source and by cross-calibration against a primary sun photomet ...

197. Stray-Light Correction Algorithm for Spectrographs
Published: 2/1/2003
Authors: Steven W Brown, Bettye C Johnson, M Feinholz, M Yarbrough, S Flora, Keith R Lykke, D K Clark
Abstract: In this work, we describe an algorithm to correct a spectrograph's response for stray light. Two recursion relations are developed: one to correct the system response when measuring broad-band calibration sources and a second to correct the response ...

198. A Comparison of Laser-Based and Conventional Calibrations of Sun Photometers
Published: 1/1/2003
Authors: N Souaidia, C Pietras, G Fargion, R A Barnes, R Frouin, Keith R Lykke, Bettye C Johnson, Steven W Brown

199. A Comparison of Laser-Based and Conventional Calibrations of Sun Photometers, ed. by G.S. Fargion and C.R. McClain
Published: 1/1/2003
Authors: N Souaidia, C Pietras, Steven W Brown, Bettye C Johnson, G Fargion

200. A Portable Integrating Sphere Source for the Earth Observing System's Calibration Validation Program
Published: 1/1/2003
Authors: Steven W Brown, Bettye C Johnson

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