1. 通过气相催化裂解法分别制得了螺径约为4μm、螺距为0.5μm～0.8μm的炭纤维和螺径为20μm左右、螺距为1μm～4μm的炭纤维。
Carbon microcoils with coil diameter about 4 μm, pitch about 0.5-0.8 μm and coil diameter about 20 μm, pitch about 1-4 μm were prepared by a vapor phase catalytic cracking process.
2. 在正常大气压下，太平洋牡蛎面盘幼虫的游泳较为舒缓，压力提高时，表现为快速的直线运动或螺径小而螺距大的螺旋运动，并出现更频繁的下沉行为，表明幼虫的紧张度已提高。
The Veliger larvae of Crassostrea gigas swan regularly in the water column under the ambient pressure, either in a vertically orientated lineal or spiral pathway.
3. 螺径
3. 由STM图象中我们能清晰地观察到螺旋结构的螺距与螺径。
From the STMimages, we could see clearly the helix pitch and helix diameter of helix structure.