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A lightning return stroke is always preceded by a downward leader process that takes a dominant role in determining the property of the return stroke. Besides, the channel parameters of a return stroke are spatial and temporal variables. These two points are ignored or scorned in most of existing return stroke modelling. In this research, we have developed a leader-return stroke coupled model based...
Based on the measurement of intrinsic fluorescence, a set of bio-aerosol including virus aerosols detection instrument is developed, with which a method of calibration is proposed using tryptophan as the target. The experimental results show a good linear relationship between the fluorescence voltage of the instrument and the concentration of the tryptophan aerosol. An excellent correlation (R2≥0...
An optical detecting technique to identify bio-aerosol particles is proposed in this paper by normalized fluorescence value which correlates to its size and intrinsic fluorescence. With the bio-aerosol detecting system developed, we test and analyze three types of aerosols, while each of them contains fluorescent microspheres of a certain size. The result indicates that different fluorescent microspheres...
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