Funding for this research was provided by:
the National Natural Science Foundation of China (41967029)
The National Key Research and Development Program of China (2019YFC1520903)
Science and Technology Planning Project of Guangdong Province (20JR5RA056)
the Open project of Gansu Provincial Research Center for Conservation of Dunhang Cultural Heritage (GDW2021YB03)
Article History
Received: 20 March 2021
Accepted: 7 September 2021
First Online: 2 November 2021