An Isopropyldioxy Flavonol from Hypericum perforatum L.

Aim Isolation and structural elucidation of the constituents from the aerialpart of Hypericum perforatum L. Methods Column chromatography and TLC were used to isolate chemicalconstituents. Physico-chemical characterization and spectroscopic analysis were employed forstructural identification. Results Three flavonols were isolated and identified. Conclusion Compound1 is a novel natural product and its structure has been characterized to be 3, 5, 7-trihydroxy-3',4'-isopropyldioxy-flavone.

某型军用电子设备表面涂装涂膜凹坑分析及解决措施

以某型军用电子设备箱体表面涂装过程中大量且反复出现的涂膜凹坑为研究对象,通过5M1E法对其原因进行分析,结合工艺验证手段,得出压缩空气含水量大、受硅酮化合物污染以及涂装车间温湿度不稳定三大影响要因。实施相应措施后,涂膜凹坑明显减少,涂装返工率得到极大改善。

烟酰胺（维生素B3）的美白应用

一个美白肌肤的配方，包含：烟酰胺或者其前供体，防晒剂4-叔丁基-4’-甲氧基-二苯甲基甲烷，2-乙基己基甲氧基酰胺或者他们的复配物，以及硅酮化合物。硅酮化合物可以是二甲基聚硅氧烷。