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In recent years, the trend of hiring external CEOs has become increasingly prevalent. However, the impact of these CEOs' prior experiences in different firms on the innovation of their successor firms has not received sufficient attention. Drawing on upper echelons theory and management power theory, this study explores the non-linear relationship between prior CEO experience and breakthrough innovation, as well as the moderating effects of different types of CEO power.

We selected China’s A-share listed manufacturing companies as samples and used zero-inflated Poisson regression to verify the hypothesis. We employed instrumental variable methodology to address potential endogeneity issues and conducted robustness tests by substituting core variables, changing measures, adding additional control variables, and shrinking the core variables.

We conclude that there exists an inverted U-shaped relationship between prior CEO experience and breakthrough innovation. Furthermore, we analyze the effects of formal and informal CEO power on the role of prior CEO experience in breakthrough innovation and find that the inverted U-shaped relationship is contingent upon the level of CEO power.

The findings extend research on CEO succession and offer a reference for firms aiming to hire external CEOs with prior experience to foster breakthrough innovation.

The purpose of this paper is to investigate the effects of surface topography, including surface roughness, waviness and taper, on the cavitation of liquid film lubricated mechanical seals (LFL-MS).

A universal governing equation considering cavitation is established, and an equivalent relative density is defined to characterize the cavitation degree. The equation is discretized by the finite volume method and solved by the Gauss–Seidel relaxation scheme.

Results indicate that both radial length and a circumferential width of the cavitation zone and cavitation degree are affected significantly by the waviness amplitude and taper, but the effect of surface roughness is limited.

Effect mechanism of surface topography on the cavitation of LFL-MS is investigated and cavitation degree is reflected by an equivalent relative density. The results further help to comprehensively explore the cavitation mechanism.