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This paper aims to discuss a comprehensive analysis of the effects of torque and flux hysteresis bands on the inverter average switching frequency considering an induction machine drive under the control of the Takahashi DTC strategy.

The analysis of the effects of torque and flux hysteresis bands on the inverter average switching frequency is carried out taking into account the speed range and the sampling period.

It has been found that the inverter average switching frequency could be more or less taken down according to the speed range and the sampling period by selecting suitable flux and torque hysteresis bands.

This work should be extended by an experimental validation of the established results.

The reduction of the inverter switching frequency is of great importance in direct torque controlled induction motor drive as far as it leads to a decrease of the torque ripple and an increase of the efficiency.

For given torque and flux hysteresis bands, the inverter average switching frequency presents nonlinear shape. Given the fact that the flux switching frequency is a linear function of the speed, one can conclude that the nonlinearity of the inverter average switching frequency is due to the torque switching frequency. This statement has been proven by the introduction of the so‐called focal speeds for the torque switching frequency turns to be null.

The purpose of this paper is to examine the impact of the characteristics of two corporate governance mechanisms, namely, board of directors and ownership structure, on the firm value of European financial institutions.

Using the market-to-book ratio calculated by the Thomson Reuters Eikon ASSET4 database, this study measures the firm value of 111 financial institutions belonging to 12 European countries listed on the stock exchange during the period 2007–2019. Multivariate regression analysis on panel data is used to estimate the relationship between corporate governance attributes, such as board size, board independence, board gender diversity, ownership concentration and CEO ownership, and the firm value of European financial institutions.

The empirical results reveal that board gender diversity and CEO ownership are positively related to the firm value, whereas board size and ownership concentration are negatively related. Furthermore, the findings suggest that board independence is insignificantly correlated with the firm value. Regarding the control variables, the results show that financial institutions' size, age and legal system are significant factors in changing the firm value. Nevertheless, financial institutions' leverage and activity sector are not significantly correlated with their value.

This research contributes to the literature by providing the significant links between some corporate governance mechanisms and the firm value of companies from the financial industry, by addressing the information gap for this critical industry in the context of a developed market like Europe.

The purpose of this study is to examine the impact of internal and external corporate governance mechanisms on the probability of engaging in tax aggressiveness.

This study uses a sample of 52 firms listed on the Tunis stock exchange observed over the 2003–2016 period (The authors had to stop sampling in 2016 because the measurement of tax aggressiveness requires 4 years after the year of study. Therefore, the data on the measurement of tax aggressiveness were collected until 2020). This paper uses the logistic regression technique.

The results of the first logistic regression show that ownership structure and the supervision role of the tax authorities are determining factors that explain tax aggressiveness; while, the attributes of the board of directors does not seem to explain the probability of engaging in aggressive tax strategies. To further probe this question, the authors carried out additional analyses that examine the moderating effect of controlling shareholders on the relationship between the attributes of the board and tax aggressiveness. The results of our additional regressions indicate that the effect of these attributes improves in cases of non-presence of a controlling shareholder. This implies that the role that the board of directors can play in controlling management is possibly conditioned by the presence or no of control block holders.

The major limitation of this study is that it concentrates only on Tunisian listed companies because they are the only companies the financial statements of which are publicly available in Tunisia. Although the sample is relatively small due to the problem of data availability, it appears to be satisfactory given the 15-year sampling period (i.e. from 2003 to 2016).

The results of the study may help Tunisian regulators create requirements for corporate governance (such as the size of the board of directors and audit committee or the concentration of ownership). Moreover, this study not only focuses on the effect of corporate governance mechanisms on tax aggressiveness but also provides shareholders with information on the governance mechanisms to which they should pay more attention in their desire to obtain more efficient tax results.

The findings are also useful for tax policymakers seeking to identify the circumstances that give rise to an increased risk of tax aggressiveness, as tax aggressive behavior and the resulting non-payment of taxes also have societal implications. In fact, taxes also play an important role in financing the provision of public goods, making corporation tax a matter of public concern.

The present study differs from others in the existing literature by designing a more precise measure of tax aggressiveness and examining the interaction between two internal governance mechanisms; the presence of a controlling shareholder and the attributes of the board of directors. This study also examines the impact of the control exercised by the tax authorities on the behavior of firms in terms of tax aggressiveness.

This study aims to investigate the effects of environmental, social and governance (ESG) performance on financial risk disclosure of European companies. It analyzed the relationships between ESG factors and financial risk disclosure between 2010 and 2020.

To test their hypotheses in this study, the authors used the multivariate regression analysis on panel data using the Thomson Reuters ASSET4 database and the annual reports of 154 European companies listed in the ESG index between 2010 and 2020.

Empirical evidence shows a positive association between European companies' environmental and governance performance with financial risk disclosure, whereas social performance does not influence financial risk disclosure. Concerning the control variables, the findings demonstrate that firm size and profitability are significant factors in changing the financial risk disclosure. Nevertheless, firms’ leverage is insignificantly correlated with financial risk disclosure.

This study extends the stream of accounting literature by focusing on the financial risk disclosure, a topic that has received little attention in previous research. Furthermore, to the best of the authors’ knowledge, this study is one of the first that provides ESG companies with evidence of the effect of ESG factors on financial risk disclosure in a developed market like Europe.

Companies should enhance their market position and competitiveness by improving staff effectiveness, skills, resource commitment, and applying relevant managerial methods. This study aims to examine the impact of knowledge management (KM) and total quality management (TQM) on employee effectiveness (EE) and supply chain performance (SCP) in emerging economies.

The used methodology consists on conducting a survey within Tunisian companies, where the authors gathered 206 responses. Collected data was analyzed using statistical package for the social sciences (SPSS) software, enabling the authors to establish a conceptual model. This model was further examined through structural equation modeling, using analysis of moment structures (AMOS) software for hypothesis validation. Additionally, the authors’ research aimed to enhance SCP and boost EE while minimizing costs through a nonlinear mathematical model and the quality function deployment method.

The results indicate that TQM and KM positively impact EE, and KM and EE positively impact SCP. However, the significance of employee performance on SCP varies depending on company location and industry sector studied.

This work emphasized the involvement of small- and medium-sized enterprise managers from emerging economies in the studied concepts and confirmed the effects of KM and TQM practices on EE and SCP.

The purpose of this paper is to examine the impact of social movements engendered by the Arab Spring crisis on the relationship between corporate social responsibility disclosure (CSRD) and corporate governance attributes, particularly board composition, considering the importance of governance after the Arab Spring event.

Content analysis was used to examine the extent and nature of CSRD in annual reports of Jordanian companies listed on the Amman Stock Exchange covering the period 2009–2016. A dynamic regression model using panel data is then undertaken for a sample of 114 listed companies over the period to analyse the potential impact of board composition on the level of CSRD.

The results reveal that there was a significant increase in the level of CSRD post-the Arab Spring crisis; and that governance appears to be a key driver. Specifically, board age, directors educated in business and/or accounting-related fields and foreign members are found to have a significant positive relationship with CSRD.

Looking at the Arab region pre- and after the Arab Spring helps to complete the global picture of how company governance can lead to improved CSR performance. Specifically, this region has been behind in developing rules and codes that include CSR. The results show that having a diverse board, with directors with expertise specific to the context, increases the effectiveness of stakeholder management through CSRD. The results, therefore, offer valuable insights for companies, policymakers and for the development of regulations.

This paper aims to analyze the performance determinants of listed companies in the Iberian Peninsula, focusing on the analysis of the effect of gender diversity and the structure of the board of directors.

To achieve this aim, the authors analyzed 97 listed companies, of which 23 are Portuguese and 74 are Spanish, between 2015 and 2019. The authors use Arellano and Bond’s (1991) generalized method of moments system model to test the hypotheses.

The results show an important impact of corporate governance variables on corporate performance. Specifically, board size, average director age and board academic qualifications are crucial to explaining profitability and market value. Moreover, the authors identified a nonlinear relationship between gender diversity and profitability and market value levels due to critical mass theory and quotas that enhance more social justice. The authors concluded that the corporate performance determinants differ depending on the performance measures.

To the best of the authors’ knowledge, this study is the first to analyze the nonlinear effect of gender diversity and board structure (size, educational qualifications and average director age) on the performance of Iberian listed companies as a single market.

This study aims to examine the impact of internal corporate governance and audit quality on the level of COVID-19 disclosure in Egypt.

The authors use manual content analysis to measure levels of COVID-19 disclosure in the narrative sections of annual reports. The authors analyze all companies listed on the Egyptian Stock Exchange over 2020–2021. The authors use different regression models to test the research hypotheses.

The analysis adds to the literature in two crucial respects. First, it provides a measure for COVID-19 disclosure in Egypt. Second, it provides evidence that governance mechanisms (board diversity, audit committee [AC] independence), auditor type and audit opinion affect the level of COVID-19 disclosure. The higher level of COVID-19 disclosure is associated with firms with more female directors on the board, being audited by one of the big four audit firms and receiving standard clean audit opinion. While the inexistence of an AC and more executives on the AC negatively affect COVID-19 disclosure levels.

To the best of the authors’ knowledge, it is the only paper that examines COVID-19 disclosure in the Egyptian context. It is also the first paper that provides evidence on the impact of internal governance and audit quality on COVID-19 disclosure.