In this article, the authors further develop the theory of leader humility by exploring the affective impact, a vital boundary condition, and the antecedents of leader humility. Specifically, they (a) theorize how leader humility can enhance followers' performance by increasing their relational energy and decreasing their emotional exhaustion, (b) test perceived leader power in the organization as an important boundary condition of leader humility effectiveness, and (c) establish leader's incremental theory of the self (i.e., growth mindset) and relational identity as important enablers of leader humility. Surveying 211 leader-follower dyads in a two-phase study (Study 1), we find that leader humility has a positive indirect effect on followers' task performance through increased follower relational energy and decreased emotional exhaustion. In addition, the effects of leader humility on followers' relational energy with the leader, emotional exhaustion, and task performance tend to be stronger when followers perceive more power in the leader. Study 2-a multiphase field study surveying 201 leader-follower dyads embedded in 85 teams-not only replicates the results found in Study 1 with more objective, multirater employee performance, but more importantly, establishes leader incremental theory of the self (or growth mindset; Dweck, 2010) and relational identity as important antecedents of leader humility. The authors discuss theoretical and practical implications and recommend directions for future research. (PsycINFO Database Record

Lamb waves are widely used in structural health monitoring (SHM) of plate-like structures. Due to the dispersion effect, Lamb wavepackets will be elongated and the resolution for damage identification will be strongly affected. This effect can be automatically compensated by the time reversal process (TRP). However, the time information of the compensated waves is also removed at the same time. To improve the spatial resolution of Lamb wave detection, virtual time reversal (VTR) is presented in this paper. In VTR, a changing-element excitation and reception mechanism (CERM) rather than the traditional fixed excitation and reception mechanism (FERM) is adopted for time information conservation. Furthermore, the complicated TRP procedure is replaced by simple signal operations which can make savings in the hardware cost for recording and generating the time-reversed Lamb waves. After the effects of VTR for dispersive damage scattered signals are theoretically analyzed, the realization of VTR involving the acquisition of the transfer functions of damage detecting paths under step pulse excitation is discussed. Then, a VTR-based imaging method is developed to improve the spatial resolution of the delay-and-sum imaging with a sparse piezoelectric (PZT) wafer array. Experimental validation indicates that the damage scattered wavepackets of A 0 mode in an aluminum plate are partly recompressed and focalized with their time information preserved by VTR. Both the single damage and the dual adjacent damages in the plate can be clearly displayed with high spatial resolution by the proposed VTR-based imaging method.

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