The fractal dimension of fracture surface was measured directly by using projective covering method and laser triangulation technique.
采用投影覆盖法结合激光三角测试技术，直接测定了混凝土断裂表面分维值。
Based on projective geometry and computer 3 dimension visual technology, the most effective method to solve sun shadow problem is present.
由此基于投影几何学理论及计算机三维可视化技术，建立了日照阴影问题最有效的方法。
This note shows that when studying geometric properties, a polynomial system is defined as a line field on a projective space such that its singular set has co dimension at least 2.
证明：在研究多项式系统的几何性质时，多项式系统应当定义成射影空间中奇点集之余维数至少为2的线场。
This note shows that when studying geometric properties, a polynomial system is defined as a line field on a projective space such that its singular set has co dimension at least 2.
证明：在研究多项式系统的几何性质时，多项式系统应当定义成射影空间中奇点集之余维数至少为2的线场。
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