If the volatile vapor pressure in the curing laminate exceeds the actual pressure on the liquid resin prior to gelation, then void formation and growth will occur.
如果树脂凝胶前挥发物的蒸气压力超过树脂流体的压力,则会在层板中生成孔隙,而且孔会长大。
So, the problems, that utilize the theory of analyzing figure to dispose crop pathological changes laminate nature texture image, and utilize BP network to class nature texture image, are studied.
为此,研究了利用分形理论对农作物病变叶片自然纹理图像进行了处理,利用BP网络来实现自然纹理图像的分类问题。
This paper describes the hybrid-construction PCB were fabricated by the FR-4 laminate and high performance low-loss prepreg to achieve lower signal crosstalk and permit lower cost.
综述了采用低成本的常规FR - 4层压板芯材和低介电常数高性能的半固化片形成的混合结构印制板,它具有较低的信号串扰和较低的成本。
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