1、Web of science
https://www.webofscience.com/wos/woscc/basic-search
2、Ei Engineering
https://www.engineeringvillage.com
3、IEEE xplore
https://ieeexplore.ieee.org/Xplore/home.jsp
4、Elsevier
https://www.sciencedirect.com/
5、SrpingLink
6、Nature
7、PNAS
8、Socopus
9、Google Scholar