Stefan problem of ice-water mixture is discussed under the condition of the second boundary and heat source accelerating to melt ice.

讨论在第二边界条件和有热源加速冰融化情况下冰水混合物自由边界问题。

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The paper divides regionally the flow under the ice cover and gives flow conditions of the regional boundary surface.

本文对冰覆盖下的河道水流进行了区域划分，给出了区域分界面上的水流条件。

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The dynamical model can be used to calculate maximum ice jam stages when discharge hydrographs at boundary sections are provided.

应用动力模型可以计算出某一流量过程的最高冰塞、冰坝水位。

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For things that clearly do have the springlike quality of shifting irreversibly if pulled (or pushed) too far, like the collapse of ice sheets or the melting of permafrost, a boundary system that seeks to stop you getting too close to the threshold seems as sensible as a safety rail is on a parapet.

ECONOMIST: The global environment