The ore genesis model for the Dachang Sn- polymetallic ore deposit has long been in dispute, and the major debate focuses on whether the stratiform and massive
The microscopic structure of charcoals was determined in two sites of Bronze Age, Chifeng area by using the scanning electronic microscope. The results showed t
Results of Mossbauer spectroscopy and ICP- AES measurement revealed a special distribution pattern of iron species in four crossing profiles of the Tertiary For
Measuring out successively the degree of coherence of the source produced by any couple of the small apertures via rotating an array composed of the small apert