Figure 8.
(a) Non-rectified acoustic spectrum of the second peak. (b) Rectified acoustic spectrum. (c) Normalized acoustic spectrum with carbon.
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.