uniform chart

When the varied amplitude of a, b values is not too great, the isoseismal threshold value of the minimum uniform magnitude can still be recognized from the magnitude characteristic chart;

当a、b值的变化幅度不太大时，仍然可从震级特征图上识别出最小均匀震级等震级阈值；

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Using Matlab programming to achieve the non uniform B spline curves and surfaces, the positive operator, inverse, derivative vector algorithm, to calculate the integral impeller blades, ruled surface data point and generates the effect chart.

在Matlab编写非均匀B样条曲线的正算、反算、导矢等算法，计算出整体叶轮、直纹面叶片、叶片等距面、叶片缝合面的数据点并生成效果图。

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