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星系的化学演化
释义
星系的化学演化
Encyclopedia
理学
星系
释
chemical evolution of galaxies
星系的化学演化
星系中恒星和星际物质的元素丰度随时间的变化过程。这类研究开始于1963年M.施米特的一篇论文,该文的主要目的是要对星系中恒星和星际物质观测到的化学元素丰度给予合理的说明。此外,将观测结果同理论预言比较还可对恒星形成和演化的理论提供重要约束。
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reduction of an elliptic curve
reduction of an equation
reduction of an expression
reduction of an operator
reduction of a problem
reduction of a quadratic form
reduction of area
reduction of a representation
reduction of a singularity
reduction of a space
reduction of a system
reduction of combustion kinetic model
reduction of data
reduction of dimension
reduction of dislocation
reduction of force systems
reduction of fractions to a common denominator
reduction of fracture
reduction of holes
reduction of marine pollutant
reduction of order
reduction of rent and interest rate
reduction of schedules
reduction of similar terms
reduction oxidation process
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