Simulation analysis by finite element software DEFORM was done to optimize the extrusion die structure for manufacturing powder metallurgical molybdenum tubes.

为了优化粉冶坯钼管材挤压模具结构，应用DEFORM有限元软件对挤压工艺进行模拟。

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Most of the switch tubes used presently work in the gas spark region (the right branch of Paschen curve), and are made of graphite and mental such as tungsten, molybdenum, stainless steel and mercury.

目前实际应用的开关管多数工作在火花放电区域(巴邢曲线的右支)，使用的电极材料一般为钨、钼、不锈钢、水银、石墨等。

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He and his colleagues have discovered many non-carbon tubes made of materials such as tungsten disulphide and molybdenum disulphide.

ECONOMIST: Was the carbon nanotube overhyped?