The KVN(Korean VLBI Network)-style simultaneous multi-frequency receiving mode is demonstrated to be promising for mm-VLBI observations. Recently, other Very long baseline interferometry (VLBI) facilities all over the globe start to implement compatible optics systems. Simultaneous dual/multi-frequency VLBI observations at mm wavelengths with international baselines are thus possible. In this paper, we present the results from the first successful simultaneous 22/43 GHz dualfrequency observation with KaVA(KVN and VERA array), including images and astrometric results. Our analysis shows that the newly implemented simultaneous receiving system has brought a significant extension of the coherence time of the 43 GHz visibility phases along the international baselines. The astrometric results obtained with KaVA are consistent with those obtained with the independent analysis of the KVN data. Our results thus confirm the good performance of the simultaneous receiving systems for the non-KVN stations. Future simultaneous observations with more global stations bring even higher sensitivity and micro-arcsecond level astrometric measurements of the targets.

This study aims to extend previous research on the structural relationships between organisational empowerment and frontline employees’ behaviors，and explores the role of the self-regulating process and its impact on service recovery performance by using fuzzy-set qualitative comparative analysis (fsQCA). Following the procedure of applying fsQCA (data calibration, truth table construction and fsQCA analysis) on the data of express mail firms in China, the results explore the combination of several causes as solutions that lead to both high and low service recovery performance. The findings show that the organisational empowerment is a sufficient antecedent for high service recovery performance, especially in case where frontline employee have full awareness and positive work involvement. Moreover, in the context of organisational empowerment, a reasonable level of emotional exhaustion represents a positive impact on performance in service recovery. This study offers more comprehensive insights for practitioners to empower frontline employees and monitor their emotions and behaviors using more appropriate approaches.