I don't know about Tianjin University of Technology, but generally speaking, there are two methods: one is the intranet of Tianjin University of Technology, enter the intranet library, enter the retrieval database, the journals you need, master's and doctoral dissertations, and download the text of CNKI. In addition, hownet's papers are not in pdf format and need to be viewed by CAJViewer software. The second is the external network. You need to provide the user name and password of the school. Usually your own tutor has it. You can borrow it from him to download the paper, which is also free. The external network needs a user name and password, otherwise it can't be downloaded, or you can entrust your classmates to download it for you.