这可能是由于基板及几何维数的限制导致。
This may be due to the substrate effect or geometric confinement.
几何维数的急剧减少导致数字分析的极大简化。
The drastic reduction in the geometric dimension leads to great simplification in mathematical analysis.
实验结果表明，分形维数能很好地表征表面轮廓，可为进一步的接触分析提供更合理的几何模型。
Taking rigid disk surface as an example, fractal parameters are obtained by means of power spectrum and structure function, providing a proper geometric model for further contact analysis.
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