semi-annual variation

The variation principle in semi-metric space and Application

半度量空间中变分原理及应用

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The mechanisms of semi-periodic variation of chip thickness were discussed, and combining with shear angle changing and dynamic behaviour of microcracks, models of chip forming process were established for SiC_p/ Al composites with different reinforcement volume fraction. 2.

探讨了切屑厚度准周期变化的内在机制，将剪切角周期变化和微裂纹的动态影响相结合，建立了适应含不同颗粒体分比的该材料的切屑形成过程模型。

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Thickness Variation Research of Drawing Process of Thick-Wall Semi-Spherical Heads

半球形厚壁封头拉深成形壁厚变化规律研究

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So the phloem is suitable source of callus and the infusion method is the better method. The calluses of phloem were treated by EMS to determine the semi-lethal concentration and get the variation plants.

说明韧皮部为愈伤组织的合适来源，浸泡法为较好的诱变处理方法。

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A week a semi-annual variation of the atomic oxygen in the upper atmosphere

高层大气原子氧的半年周变

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