permanent

Microstructure evolution and fractographs of DZ621 nickel-base superalloy during stress rupture test in 1100℃/60MPa was investigated by SEM.

本文用扫描电镜研究了DZ621镍基高温合金在1100℃/60MPa持久过程中的组织变化及其断裂后的断口形貌。

The stress rupture equation with high reliability is an important basis in the design of the mechanism working in high temperature environment.

高可靠度的蠕变持久方程是高温机械设备设计和寿命评估的重要依据 ,但是 ,根据现行方法得出的蠕变持久可靠性方程无法满足预定的置信度和可靠度的要求 ,导致其预测的蠕变持久强度和使用寿命过大 ,使高温机械在实际使用中偏于危险。

The author put forward a new kind of lasting foamed hair dye colorant -hair dye mousse, this new kind of colorant can dye, finalize, nurse and beautify hair.

综合染发剂美发和摩丝护发、定型的特点,针对目前一般染发剂的不足,研制开发出一种具有染发 及头发定型、护理多重功能的新型泡沫状持久性染发剂——染发摩丝,并对染发摩丝的主要原料、配方选择、 制备工艺等作了研究。

We discuss persistence, and existence and global stability of nonnegative equilibria for the system.

讨论了系统的持久性，非负平衡点的存在性和全局稳定性，获得了系统持久与一致持久的条件。