Through studying the relationship between space vectors of different coordinate systems, a new model of three-dimensional datum transformation is proposed.
从空间几何角度出发，利用空间向量的关系研究坐标转换，提出一种新的三维基准转换模型。
A three-dimensional numerical model for laser surface transformation hardening of metals using the finite differential technique is given in this peper.
给出了用有限差分法对金属材料激光相变硬化过程建立的三维数值模型。
By applying formal asymptotic analysis and Laplace transformation, we obtain two-dimensional model system of linearly viscoelastic "flexural" shell from three-dimensional equations.
应用形式渐近分析和拉普拉斯变换，我们从三维线性粘弹性方程组得到二维线性粘弹性弯壳的数学模型。
Finally, a three-dimensional cellular automaton model (3dca) is developed to simulate the microstructure formed during the austenite to ferrite transformation.
最后，建立了三维等温奥氏体-铁素体相变的元胞自动机(3dca)模型。
Finally, a three-dimensional cellular automaton model (3dca) is developed to simulate the microstructure formed during the austenite to ferrite transformation.
最后，建立了三维等温奥氏体-铁素体相变的元胞自动机(3dca)模型。
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