Figure 13.
Worn surface of an NAO pad: (a) SEM backscattered electron image; (b–d) EDS spectra corresponding, respectively, to the areas labeled as b, c, and d in (a) (accelerating voltage 20 kV, working distance 15.3 mm).
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.