Through the research on the history and actuality of the quaternion and the quaternion matrix theory , we have found that , from 1843, when English mathematician W.
通过对四元数和四元数矩阵理论的历史与现状的考查，我们发现，从1843年英国数学家W 。
Therefore, research on the problem not only has the very strong actuality, but also has the important theory meaning.
因此，对历史人口问题的研究不仅具有很强的现实性，还有重要的理论意义。
This paper sum up the scientific signification, research actuality and perspective of its application of numerical simulation on ventilation of the solar chimney.
简要介绍了数值模拟技术在太阳能烟囱通风效应研究的科学意义、研究现状和应用前景作了分析总结。
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