Improved Determination of Bimodal Size Distributions from Measurements with Diffusional Size Classification
| Autor: | A. Reineking, G. Vezzù, Ch. Schuler, G. Butterweck-Dempewolf |
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| Rok vydání: | 1999 |
| Předmět: | |
| Zdroj: | Aerosol Science and Technology. 31:383-391 |
| ISSN: | 1521-7388 0278-6826 |
| Popis: | The size distribution of the unattached fraction of the short-lived radon progeny is reported in the literature to have a bimodal structure. Due to the weak size resolution of diffusional size classification, a wide variety of bimodal size distributions yields similar measurement results, obstructing the reconstruction of size distribution parameters from measured data. For example, it could be shown that although 2 of the commonly used nonlinear approximation algorithms per formed well for the reconstruction of a monomodal size distribution, the reproduc tion of parameters of a bimodal size distribution was unsatisfactory. In conse quence, a "random walk" approach is presented. The basic idea for this approach consists of probing the complete parameter space as an ideal method for locating the best set of parameters. Additionally, 2 steps are introduced for the reduction of computation time to render the ideal approach to an applicable method. The range of geometric standard deviations for the calculatio... |
| Databáze: | OpenAIRE |
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