The results showed that negative air ion concentrations increased gradually and ion polarityratio decreased gradually from city center to suburb.
结果表明：从福州市中心向郊区空气负离子浓度逐渐增大，单极系数逐渐减小；
2
The results showed that the aromatic ratio, heteroatom and metal contents contribute to the high polarity of the asphaltenes. This is the basis of other properties of heavy oil.
结果表明，沥青质的高极性是由其高芳烃含量、高杂原子和金属含量引起的，这是研究稠油其它性质的基础。
3
They also investigate the effects of dosage of chiral reagent, reaction time, reaction temperature, polarity of solvent on conversion ratio and relative optical activity.