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.
(a) Schematic of the home-made tribometer used [27]. (b) Passive self-aligning sample holder based on two orthogonal axes of rotation coplanar with the contact plane [27]. The system is made much more user-friendly by using thread-tightening screws simplifying considerably preliminary adjustments.
