The results show that the relatively strong cloud development (with the high updraft velocity)can strength the difference of cloud droplet chemistry resulting from the nucleation of aerosols and the condensational growth of cloud droplets.

Bromine content of brominated butyl rubber(BBR)was determined by 1H-nuclearmagnetic resonance(1H-NMR),wavelength-dispersive X-ray fluorescence spectrometry(XRF)and chemical titration respectively.

The method, using combination of gas chromatography (GC) and chemical titration, could determine respectively contents of alcohol and magnesium ion in the HDC catalyst carrier, and then ratio of alcohol and magnesium in the carrier could be obtained.

The average substitution degree of hydroxypropyl β cyclodextrin could be determined based on a chemistry titration method which could be done in an ordinary laboratory.

Based on the principle of chemical potential and phase equilibrium of multi-component system,this paper analyzed the problems of the heat transfer equation of cloud droplets growth.