The theory of Distributed cognition supplies individual cognition with the Reciprocal Interaction Model and the Concentric Model. It plays a heuristic role in the present teaching reform.
分布式认知理论为个体认知提供了交互模型和同心圆模型，对当前教学改革具有重要的启示作用。
In this model, the nonuniform sphere is modeled by Numbers of concentric spherical shells, and each has a fixed electron density.
在此模型中，把非均匀等离子体球分成若干个同心等离子体球壳，并且假定每一个同心壳层内等离子体密度均匀分布。
CME triggering model has concentric circular magnetic field profiles to make CME magnetic field structure similar to that in the section of the magnetic cloud structure.
触发CME时采用具有同心圆磁场位形的触发模式，触发的CME事件具有和磁云横截面磁场相似的结构。
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