提出了一种基于自适应四叉树分形编码的数字水印技术。
This article introduces a digital watermarking technology based on adaptive quadtree fractal coding.
通过网格试验研究分析了枝叉管形件剪-挤工艺过程的金属流动情况及其变形规律；
Grid-experiments are performed to investigate metal flow and deformation in the shear-extrusion process of tubular components with branches.
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