The dualsymmetry of Legendre transformation is studied.
指出热力学关系具有勒让德变换的对偶对称性。
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This paper presents a new method that PIR-P dual loop control based on rotating coordinates to improve the output voltage symmetry of inverter under the serious unbalanced load condition.
The optical element forms dual mode structure in low symmetry. The invention raises structural performance band gap of photon crystal, and obtains even structure of photon crystal in large area.