Whether somber or whimsical, masks are transformation devices: you put one on and you assume a new identity, one that can radiate supernatural energy.
The importance of the theme of metamorphosis is more apparent than real; passion is the essential theme of the poem, and passion imparts more unity to the work than do the transformation devices employed by Ovid.
Therefore, international cooperation is required to unify network codes, planning standards, energy transformation devices and information system interfaces.
Therefore, high-efficiency energy transformation devices and the interaction pathways they enable between different energy systems should be studied in depth, especially low-cost P2G technologies and impacts.
In the Energy Internet, different energy systems are coupled through energy transformation devices (e.g., micro-turbine, electric vehicle (EV), power to gas (P2G), or vehicle to grid (V2G)).
In this paper, we have reviewed the recent progress on the parametric design of transformation devices, such as invisibility cloaks, electromagnetic (EM) concentrator, EM-wave converter, etc.
