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140 results on '"Drewry, J."'

25. The Arctic Boundary Layer Expedition (ABLE 3A): July–August 1988

Author

Harriss, R. C., primary, Wofsy, S. C., additional, Bartlett, D. S., additional, Shipham, M. C., additional, Jacob, D. J., additional, Hoell, J. M., additional, Bendura, R. J., additional, Drewry, J. W., additional, McNeal, R. J., additional, Navarro, R. L., additional, Gidge, R. N., additional, and Rabine, V. E., additional

Published
1992
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26. The Amazon Boundary Layer Experiment: Wet season 1987

Author

Harriss, R. C., primary, Garstang, M., additional, Wofsy, S. C., additional, Beck, S. M., additional, Bendura, R. J., additional, Coelho, J. R. B., additional, Drewry, J. W., additional, Hoell, J. M., additional, Matson, P. A., additional, McNeal, R. J., additional, Molion, L. C. B., additional, Navarro, R. L., additional, Rabine, V., additional, and Snell, R. L., additional

Published
1990
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38. Notes

Author

Taylor, A., primary, Rashbrook, R. B., additional, Drewry, J., additional, Raven, T. W., additional, Brink, D. W., additional, Norwitz, George, additional, Irudayasamy, A., additional, Natarajan, A. R., additional, and Roos, J. B., additional

Published
1962
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47. A COMPUTATIONAL FLUID DYNAMICS MODEL OF ALGAL GROWTH: DEVELOPMENT AND VALIDATION.

Author

Drewry, J. L., Choi, C. Y., An, L., and Gharagozloo, P. E.

Subjects
ALGAL growth, COMPUTATIONAL fluid dynamics, PHOTOBIOREACTORS, WATER quality, BIOMASS energy
Abstract

Biofuels derived from algae are becoming an increasingly viable alternative to petroleum-based fuels; however, research and development in the field must continue to advance the technology before biofuels can be produced in an economical and environmentally friendly manner. Unlike with photobioreactors, there is no generally accepted model for evaluating the growth of algae in open raceways because algal growth involves a large number of variables. For this reason, computational fluid dynamics (CFD) could prove to be a valuable and effective tool for the design, optimization, and operation of large-scale raceway ponds under local environmental conditions. CFD can elucidate and quantify the complex sets of variables that govern heat, mass, and flow patterns within the pond and provide spatiotemporal data concerning algal concentration and other water quality variables, such as light and temperature. The corresponding outcomes will enable designers to create more efficient ponds and more accurately predict growth under a variety of scenarios, as well as optimize the pond's operation in order to produce the maximum amount of biomass possible within a given locality. The present study focuses on developing user-defined functions capable of capturing key parameters, verifying the CFD outcomes against existing experimental data, providing computational solutions, and assessing the sensitivity of the model. [ABSTRACT FROM AUTHOR]

Published
2015
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48. The effects of missing data on global ozone estimates

Author

Drewry, J. W and Robbins, J. L

Subjects
Geophysics
Abstract

The effects of missing data and model truncation on estimates of the global mean, zonal distribution, and global distribution of ozone are considered. It is shown that missing data can introduce biased estimates with errors that are not accounted for in the accuracy calculations of empirical modeling techniques. Data-fill techniques are introduced and used for evaluating error bounds and constraining the estimate in areas of sparse and missing data. It is found that the accuracy of the global mean estimate is more dependent on data distribution than model size. Zonal features can be accurately described by 7th order models over regions of adequate data distribution. Data variance accounted for by higher order models appears to represent climatological features of columnar ozone rather than pure error. Data-fill techniques can prevent artificial feature generation in regions of sparse or missing data without degrading high order estimates over dense data regions.

Published
1981

50. Statistical sampling analysis for stratospheric measurements from satellite missions

Author

Drewry, J. W, Harrison, E. F, Brooks, D. R, and Robbins, J. L

Subjects
Geophysics
Abstract

Earth orbiting satellite experiments can be designed to measure stratospheric constituents such as ozone by utilizing remote sensing techniques. Statistical analysis techniques, mission simulation and model development have been utilized to develop a method for analyzing various mission/sensor combinations. Existing and planned NASA satellite missions such as Nimbus-4 and G, and Stratospheric Aerosol and Gas Experiment-Application Explorer Mission (SAGE-AEM) have been analyzed to determine the ability of the missions to adequately sample the global field.

Published
1978

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