Topological optimization system of variable density method based on finite element software;2. Interface depths inversion of potential field data with variable density model;3. According to the characteristics of the cold insulation box of Fractionating tower, it is considered that the effect of inner-filling on the construction is related with the variable density, then the relative formulation in the condition of n.

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varifocal optical system：變焦光學系統(tǒng)

variable-hue optical sound recording 變色光學錄聲 | varifocal optical system 變焦光學系統(tǒng) | varying optical density 可變光學密度