http://me-mechanicalengineering.com/heat-engine-classification/

Radical Sinks (Short Version)

Radical sinks draw energies from unequal social relations without changing those relations. They give rise to extrinsic motivations for radical action. Radical praxis draws energies from unequal social relations and uses it transformatively. It involves motivations intrinsic to radical projects.

CC BY-SA 3.0, https://en.wikipedia.org/w/index.php?curid=22727794

Radical Sinks

We can define radicalism not by its conspicuous oppositionalism or militancy, but by its effort to intentionally transform social systems. The radical Left is a loose constellation of attempts to achieve maximal human freedom and equality through intentional social-systemic transformation. Any process which draws energy from that trajectory without returning it can be considered in terms analogous to a thermodynamic sink.

Source: http://www.theprojecttwins.com/a-z-of-unusual-words

Beyond Hegemony and Counterhegemony

Single-dialectic thinking has limitations which explain why radicals have a tendency to antagonize their allies and to fight amongst themselves, splitting into subfactions and trashing the insufficiently pure. This is not just pettiness or zealotry. There is a real epistemic problem at work.