Using monitored data of air sulphation speed for 1989-2003, the space-time change in (Xi 'an) City is analyzed.

依据1989—2003年监测数据，分析了西安市大气中硫酸盐的时空变化。

The results show that when the battery is charged at low current and constant voltage, its failure mode is the sulphation of negative plate and the softening of positive plate;

用优选充电制度，电池失效模式是正极活性物质软化，板栅腐蚀相对较少。

The invention relates to a sulphation modification method of codonopsis pilosula polysaccharide, belonging to the traditional Chinese medicine polysaccharide structure modification technical field.

本发明为一种党参多糖的硫酸化修饰方法，属于中药多糖的结构改造技术领域。