Emergy
Emergy is a type of available energy (exergy) that is consumed in direct and indirect transformations needed to make a product or service. Emergy accounts for, and is, therefore, in effect a measure o...
Emergy - Wikipedia
Transformity
The concept of transformity was first introduced by David M. Scienceman in collaboration with Howard T. Odum. In 1987 Scienceman proposed that the phrases, "energy quality", "energy quality factor", a...
Free system
A free system is a material system which is subject to no other than internal and normal connections.
Energy returned on energy invested
In physics, energy economics and ecological energetics, energy returned on energy invested (EROEI or ERoEI); or energy return on investment (EROI), is the ratio of the amount of usable energy acquired...
Energy returned on energy invested - Wikipedia
Fusion energy gain factor
The fusion energy gain factor, usually expressed with the symbol Q, is the ratio of fusion power produced in a nuclear fusion reactor to the power required to maintain the plasma in steady state. The...
Energy Systems Language
The Energy Systems Language, also referred to as Energese, Energy Circuit Language, or Generic Systems Symbols, was developed by the ecologist Howard T. Odum and colleagues in the 1950s during studies...
Energy Systems Language - Wikipedia