SUMMARY In this study, we examine how investors perceive the quality of financial reports audited by auditors with long tenure. We argue that auditor tenure is an important characteristic that influences the effectiveness of audits and thus affects the amount of firm-specific information that is included in stock prices by investors. Based on a sample of U.S. firms from 2003 to 2012, we show that longer tenure is associated with higher stock price idiosyncratic volatility. Further analyses reveal that this effect is only present for industry-specialist auditors, suggesting that the effect of tenure on idiosyncratic volatility is contingent on industry expertise. Our results have a number of implications for the financial markets and the accounting and auditing professions.

Improving output performance of triboelectric nanogenerators (TENGs) is crucial for expanding their applications in smart devices, especially for flexible and wearable bioelectronics. In this study, we design and fabricate a flexible, stretchable, and highly transparent TENG based on an unsymmetrical PAM/BTO composite film, made of polyacrylamide (PAM) hydrogel and BaTiO 3 nanocubes (BTO NCs, BTO), and the TENG performance can be tailored by adjusting the amount and distribution location of BTO. The stretchable hydrogel electrode could bear over 8 times stretching. By changing the content and distribution location of BTO in the unsymmetrical hydrogel film, the output of the fabricated TENGs could be improved, acting as pressure sensors with high sensitivity to distinguish a spectrum of forces (0.25−6 N) at the low frequency. The mechanism of the enhanced output performance of the PAM/BTO composite hydrogel-based TENG is discussed in detail. By integrating piezoresistive, piezoelectric, and triboelectric effects, the optimized TENG and piezoresistive sensors are used as multimodal biomechanical sensors for detecting the motions of human bodies, pressure, and curvature with high sensitivity.

Research data are not shared.

No abstract

No abstract

A golden dance! A series of symmetric and nonsymmetric propargylic esters tethered to cyclohexadienones were found to undergo the title reaction sequence under mild reaction conditions through gold catalysis. The product cyclohexenones or cyclohexanones having a γ‐quaternary center arise from simultaneous multiatom transpositions with complete stereochemical control.

COVID-19 spread throughout the world during 2020, bringing an increase in global financial risk. We use connectedness network to investigate the risk contagion among global stock markets during the COVID-19 pandemic and analyse its source. Furthermore, we use spectrum analysis to explore the risk contagion effects on different frequency bands, which allows us to explore its speed and channels. We find that the United Kingdom and Italy are core transmitters of risks, and connectedness is mainly driven by low-frequency components, which demonstrates that the risks are spread by affecting supply chains in global markets and investors' long-term expectations for the economy.

A cobalt­(III)-catalyzed, redox-neutral, intermolecular carboamination of propiolates and bicyclic alkenes was developed. This non-annulative coupling strategy features atom economy, high regioselectivity, good yields, and functional groups tolerance. Such a carboamination reaction was applied to modified phenols from the corresponding phenols under mild conditions.