It reviews the optimization measures of Al-Si piston alloy, including kinds, chemical composition, grain refinement, modification, alloying and heat treatment.

评述了铝硅活塞合金的种类，化学成分，晶粒细化，变质处理，合金化和热处理工艺等优化手段。

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The optimization of mix composition of concrete according the calculation of inner stress at early age may reduce the cracking risk of concrete structure.

早龄期时混凝土结构内应力的计算为优化混凝土材料的组成提供了依据，尽可能减少混凝土结构的开裂。

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The model composition was given out, and the effect of the sequence of hierarchical multistage fusion and partial fusion on integrated estimation as well as the optimization were discussed.

给出了模型的构成，并讨论了分层多级融合顺序与部分融合对全局估计的影响及其优化。

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