Results 141 to 150 of about 119,705 (176)
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Steady State Instability and Oscillation in Simplified Models of Tropospheric Chemistry
The Journal of Physical Chemistry A, 2001Three components have been identified as being common to oscillation in five related but increasingly complex models of tropospheric chemistry. The first of these components is an NOx-empty/refill cycle in which [NOx] grows or declines, depending upon the relative source rates of NOx and HOx, the latter being generally proportional to the rate of ...
Mark R. Tinsley, Richard J. Field
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Multiple steady states in atmospheric chemistry
Journal of Geophysical Research: Atmospheres, 1993The equations describing the distributions and concentrations of trace species are nonlinear and may thus possess more than one solution. Several authors have suggested that the steady‐state equations describing tropospheric and stratospheric chemistry may have multiple solutions, but the existence of such solutions has not been completely demonstrated.
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Combustion Theory and Modelling, 2003
Splitting techniques have been used extensively for computing reacting flows with detailed chemistry. Nevertheless, there are still some open questions with respect to efficiency and the error introduced by splitting. In this paper, the accuracy and effectiveness of split-operator methods for computing steady-state reacting flows are determined.
Douglas Schwer +3 more
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Splitting techniques have been used extensively for computing reacting flows with detailed chemistry. Nevertheless, there are still some open questions with respect to efficiency and the error introduced by splitting. In this paper, the accuracy and effectiveness of split-operator methods for computing steady-state reacting flows are determined.
Douglas Schwer +3 more
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The study of soil chemistry through quasi-steady-state models: II. Acidity of soil solution
Geochimica et Cosmochimica Acta, 1990Abstract The acidity of three hypothetical soil solutions was studied with a quasi-steady-state model. Processes were assigned to one of three time scales: fast (processes at equilibrium), slow (processes for which the kinetics are specified explicitly), or very slow (processes that have a negligible effect on the steady-state solution).
Gerhard Furrer +2 more
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Environmental Pollution, 1989
Data on deposition and streamwater chemistry, obtained for the upper catchment of the River Duddon in the 1970s and 1980s, are reviewed. These data, together with soil chemical data, are used to deduce key processes in the deposition-catchment interaction, the analysis being based on current concepts of acidification.
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Data on deposition and streamwater chemistry, obtained for the upper catchment of the River Duddon in the 1970s and 1980s, are reviewed. These data, together with soil chemical data, are used to deduce key processes in the deposition-catchment interaction, the analysis being based on current concepts of acidification.
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Combustion and Flame, 2012
Abstract Many reduced-model methods have been developed to alleviate the computational expense of simulating chemically reacting flows with detailed kinetics. However, it is still impossible to determine exactly the loss in accuracy relative to the full model when reduced kinetic models are used for predicting quantities of interest (typically state ...
Oluwayemisi O. Oluwole +3 more
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Abstract Many reduced-model methods have been developed to alleviate the computational expense of simulating chemically reacting flows with detailed kinetics. However, it is still impossible to determine exactly the loss in accuracy relative to the full model when reduced kinetic models are used for predicting quantities of interest (typically state ...
Oluwayemisi O. Oluwole +3 more
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Thin Solid Films, 1999
Abstract Polarization-modulated Fourier-transform infrared reflection absorption spectroscopy has been applied to the characterization of thin films of AlN and Al oxynitride (‘AlON’) on NiAl(111) and to the observation of surface chemical processes under steady-state conditions in a static NH 3 ambient of up to 200 Torr.
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Abstract Polarization-modulated Fourier-transform infrared reflection absorption spectroscopy has been applied to the characterization of thin films of AlN and Al oxynitride (‘AlON’) on NiAl(111) and to the observation of surface chemical processes under steady-state conditions in a static NH 3 ambient of up to 200 Torr.
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Steady state approximations and urban atmospheric chemistry
The Journal of Physical Chemistry, 1977L. A. Farrow, T. E. Graedel
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