It is proved that the stiffness matrix of the finite element solution is a block diagonal matrix and its elements are some symmetric and block circulant submatrices.
证明了有限元求解的刚度矩阵是一个块对角阵，且其子矩阵是某种对称、块循环矩阵。
Meanwhile, well operators considered drilling a relief well: a diagonal well intersecting the original that could be filled with mud or concrete to block the flowing oil
同时，钻井操作员们考虑钻一条减压井：原来的井斜角交错，钻井里可能充满了泥浆或混凝土块，阻塞了石油的通畅。
The objective of designing the two buildings is to create double exposure, diagonal views and transparency on all the levels of the block.
两栋大体量建筑的设计旨在给所有楼层的户型创造双重朝向、视觉穿透性和通透的效果。
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