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Author (Last Name): johnson
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Displaying records 191 to 200 of 441 records.
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191. New Technologies for Radiometry: Impact on Ocean Color Research
Published: 8/1/2003
Authors: Bettye C Johnson, Steven W Brown, N Souaidia, M Feinholz, M Yarbrough, S Flora, D K Clark
Abstract: Ocean color satellites provide global determinations of chlorophyll a by measurements of the spectral radiance of the oceans. This is a difficult measurement because the at-satellite radiance is dominated by the atmospheric contribution, and pre-fli ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841762

192. MOBY, A Radiometric Buoy for Performance Monitoring and Vicarious Calibration of Satellite Ocean Color Sensors: Measurement and Data Analysis Protocols
Published: 6/1/2003
Authors: D K Clark, Marilyn Yuen Murphy, M Yarbrough, M Feinholz, S Flora, W Broenkow, Bettye C Johnson, Steven W Brown, Y S Kim, J Mueller
Abstract: The Marine Optical Buoy (MOBY) (Clark et al. 1997) is the centerpiece of the primary ocean measurement site for calibration of satellite ocean color sensors based on independent in situ measurements. Since late 1996, the time series of normalized wa ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841593

193. Stray-Light Correction of the Marine Optical Buoy
Published: 6/1/2003
Authors: Steven W Brown, Bettye C Johnson, S Flora, M Feinholz, M Yarbrough, R Barnes, Y S Kim, Keith R Lykke, D K Clark
Abstract: In ocean-color remote sensing, approximately 90% of the flux at the sensor originates from atmospheric scattering, with the water-leaving radiance contribution the remaining 10 % of the total flux. Consequently, errors in the measured top-of-the atm ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841707

194. Radiometric Measurement Comparison on the Integrating Sphere Source Used to Calibrate the Moderate Resolution Imaging Spectroradiometer (MODIS) and the Landsat 7 Enhanced Thematic Mapper Plus (ETM+)
Series: Journal of Research (NIST JRES)
Published: 5/1/2003
Authors: James J. Butler, Steven W Brown, Robert D. Saunders, Bettye C Johnson, S F Biggar, E F Zalewski, B L Markham, P N Gracey, J B Young, R Barnes
Abstract: As part of a continuing effort to validate the radiometric scales assigned to integrating spheresources used in the calibration of Earth Observing System (EOS) instruments, a radiometric measurement comparison was held in May 1998 at Raytheon/Santa B ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841717

195. Symmetrization of Ritz Approximation Functions for Vibrational Analysis of Trigonal Cylinders
Published: 4/1/2003
Authors: Ward L Johnson, Paul R Heyliger
Abstract: In the Ritz method of calculating vibrational normal modes, a set of finite series approximation functions provides a matrix eigenvalue equation for the coefficients in the series and the resonant frequency. The matrix problem usually can be block-d ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851250

196. Traction-Free Vibrations of Finite Trigonal Elastic Cylinders
Published: 4/1/2003
Authors: Paul R Heyliger, Ward L Johnson
Abstract: The unrestrained, traction-free vibrations of finite elastic cylinders with trigonal material symmetry are studied using two approaches, based on the Ritz method, which formulate the weak form of the equations of motion in cylindrical and retangular ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851249

197. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=842276

198. Radiometric Calibration 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 E Feinholz, M Yarbrough, D K Clark
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=103837

199. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841585

200. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841719



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