1

2 Subjects: “...Beijing...”

3 Subjects: “...Beijing-Tianjin-Hebei urban agglomeration...”

4 Subjects: “...Beijing-Tianjin-Hebei region...”

5 Subjects: “...Beijing...”

6 Subjects: “...Beijing-Tianjin-Hebei coordinated development...”

7 Subjects: “...Beijing...”

8 Subjects: “...Beijing...”

9 Subjects: “...Beijing-Tianjin-Hebei region...”

10 Subjects: “...Beijing-Tianjin-Hebei urban agglomeration...”

11 “...In 2018, the 16th International Symposium on Magnetic Bearings (ISMB16) was held in Beijing, China...”

12 “... of this Special Issue are Dr. Gong, a professor from China University of Geosciences (Beijing), and Dr. Shi, a...”

13 “... Annual Conference of Energy Economics and Management held in Beijing, China, 22-24 September 2017...”

14 “... September 2020 in Beijing, China. The conference was organized by the Tsinghua University, China...”