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This paper aims to improve the previous fuel scrubbing model and find out the relationship between bubble diameter and scrubbing efficiency (ƞ).

A fuel tank scrubbing test bench was established to verify the accuracy of this model. Ullage and dissolved oxygen concentration were measured, and images of bubble size and distribution were collected and analyzed using image analysis software.

The bubble diameter has a great influence on ullage and dissolved oxygen concentration during the fuel scrubbing process. The scrubbing efficiency (ƞ) has an exponential relationship with bubble diameter and decreases rapidly as the bubble diameter increases.

The variation of the ullage and dissolved oxygen concentration predicted by this model is more accurate than that of the previous model. In addition, the study of bubble size can provide a guidance for the design of fuel scrubber.

This study not only improves the previous fuel scrubbing model but also develops a method to calculate scrubbing efficiency (ƞ) based on bubble diameter. In addition, a series of tests and analyses were conducted, including numerical calculation, experiment and image analysis.

This paper examines the relation between political sentiment and future stock price crash risk.

This study employs firm-level political sentiment from earnings conference calls. The empirical analysis applies panel regressions on 40,254 US firm-year observations between 2002 and 2020, controlling for various firm-specific determinants of crash risk and firm-, industry- as well as time-fixed effects.

The study identifies a negative association between both the level and the change of political sentiment and stock crash risk. Further analysis shows that the predictive power of political sentiment is independent of either non-political sentiment or political risk and remains consistently strong during periods of either high or low economic policy uncertainty. Moreover, the predictive effect of political sentiment is more pronounced for firms with high litigation risk.

The evidence highlights the important role of political sentiment in predicting stock crash risk. The results are consistent with the signaling hypothesis that managers tend to use their tone in conference calls to convey informative messages on firm outlooks.

The study provides a recommendation on risk management: soft information such as political and non-political sentiment in earnings conference calls is useful in managing stock crash risk. The study findings also call for careful consideration of social costs, such as stock crash risk, associated with political policies. Ill-conceived policies may lead to market crashes, which can potentially outweigh the upsides of well-meaning political reforms.

To the authors best knowledge, this is the first study to identify the effect of time-varying firm-level political sentiment conveyed in conference calls on stock price crash.

This study aimed to quantify and map academic literature of ESG from a bibliometric perspective and to provide a comprehensive review of the recent literature published in the high-rated journal articles.

The study analyzed 867 and 388 documents from Scopus and Web of Science (WoS) data respectively using bibliometric analysis. Biblioshiny and VOSviewer software was used for performance analysis and science mapping respectively. Further, manual content analysis of the 190 research articles published in the last five years was conducted.

The results demonstrate that ESG is an emerging domain in the field of sustainable finance as the number of publications and total citations are showing an upward trend. The top two journals in terms of productivity are the Journal of Sustainable Finance and Investment and Business Strategy and the Environment. The highest number of publications are from the United States and George Serafeim is the most influential author in the ESG domain. Further, the result of cluster analysis of bibliographic coupling reveals four intellectual themes, (1) ESG investing; (2) ESG disclosures and Integrated Reporting; (3) ESG performance and firm value and (4) Corporate Governance and ESG performance. The content analysis of the 190 high-quality journal articles presents the current 11 areas of research in ESG. The impact of ESG on firm value and ESG investment are the prominent themes, and the effect of ESG on the cost of capital and ESG audit and assurance are the emerging themes in this domain.

The keyword search is solely focusing on the theme of the study. Further, other keywords such as Corporate Social Responsibility and Corporate sustainability taken along with ESG may provide distinct results.

The study advances the understanding of the ESG domain by developing new possibilities to discover key research areas.

The present work provides a comprehensive and detailed bibliometric and content analysis of ESG literature. This study delineates the thorough literature review of journal articles published in the recent five years in high-rated journals.