This paper established the machine expansion theory of heat-shrinkable tube inferred the relevancy of expansion resistance and root of pole support given the calculation method of expansion resistance pole support diameter and heating time .

本文建立了热收缩 管的机械扩张理论，导出了扩张阻力和支撑杆数量的关系，给定了扩张阻力、支撑杆直径和 加热 时间的计算方法。

High speed steel samples were ion nitrided in a tube reactor with an auxiliary heating furnace . The change of nitriding layer thickness surface hardness and impact strength of the sample with H 2 / N 2 ratio temperature and time were studied .

用外 加热 方式在 管状反应室中对高速钢试样进行离子氮化，对氮化层的厚度变化、表面硬度及冲击韧性随H2／N2、渗氮温度及 时间的变化进行研究。

The effects of the diameter of the evacuated tube the heating time and the emissivity of the selective coating on the performance of the cooling system is studied and the optimization design of the system is investigated .

分析了工作参数对这两种真空集 热型 制冷系统的影响，并对系统结构进行了优化研究。