This research served as actual proof of the theory.

He is researching about a new energy source.

He is conducting research on a new energy source.

He is good at explaining that theory.

He is immersed in the study of positivism.

He strongly believes in the philosophy of positivism.

He analyzed the problem from the perspective of positivism.

This research is based on empirical data.

He is a world-renowned researcher.

My brother is a graduate student at the University of Tokyo.