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This study aims to analyze the two-dimensional ferrofluid flow in porous media. The effects of changes in parameters such as permeability parameter, buoyancy parameter, Reynolds and Prandtl numbers, radiation parameter, velocity slip parameter, energy dissipation parameter and viscosity parameter on the velocity and temperature profile are displayed numerically and graphically.

By using simplification, nonlinear differential equations are converted into ordinary nonlinear equations. Modeling is done in the Cartesian coordinate system. The finite element method (FEM) and the Akbari-Ganji method (AGM) are used to solve the present problem. The finite element model determines each parameter’s effect on the fluid’s velocity and temperature.

The results show that if the viscosity parameter increases, the temperature of the fluid increases, but the velocity of the fluid decreases. As can be seen in the figures, by increasing the permeability parameter, a reduction in velocity and an enhancement in fluid temperature are observed. When the Reynolds number increases, an increase in fluid velocity and temperature is observed. If the speed slip parameter increases, the speed decreases, and as the energy dissipation parameter increases, the temperature also increases.

When considering factors like thermal conductivity and variable viscosity in this context, they can significantly impact velocity slippage conditions. The primary objective of the present study is to assess the influence of thermal conductivity parameters and variable viscosity within a porous medium on ferrofluid behavior. This particular flow configuration is chosen due to the essential role of ferrofluids and their extensive use in engineering, industry and medicine.

This study aims to fill several gaps in the literature. First, it examines the Umrah industry from the supply side, investigating the pivotal factors for travel agencies’ performance. Second, it empirically investigates service leaders’ competencies specific to the hospital and tourism industry. Third, it clarifies whether there is a direct impact of organisational service orientation on business performance. Fourth, it explores the influence of network capabilities in a service context, specifically in travel agencies, which has rarely been discussed.

This is a mixed-method study with sequential explanatory research design. First, a quantitative approach was conducted with 150 authorised travel agencies in Indonesia, with two manager-level employees representing each agency. The data were analysed using descriptive statistics and structural equation modelling. A qualitative study was conducted to enrich the findings by interviewing the Director of Umrah and Hajj Development of the Ministry of Religious Affairs of the Republic of Indonesia and three other respondents.

Service leaders’ competencies and resource capacity significantly influence organisational service orientation, leading to enhanced perceived service quality and performance. In addition, resource capacity influences network capabilities, improving performance.

This study identifies factors affecting the performance of Umrah travel agencies in an intensely competitive environment, which has rarely been discussed. This sheds light on how travel agencies can survive and succeed in this competitive industry. Moreover, this study provides evidence regarding the role of network capabilities in the tourism industry and the impact of organisational service orientation, both directly and indirectly, on performance.

The purpose of the this study is to discover the impact of practices of knowledge management, intellectual property protection and management innovation on entrepreneurial leadership, which in turn leads to sustainable growth in small and medium-sized enterprises.

The data was collected from 292 small and medium-sized businesses (SMEs) in the USA using a cross-sectional survey. To evaluate the study hypotheses and analyse the data, structural equation modelling was used. SMART-PLS software was used for both confirmatory factor analysis and structural analysis.

The work has significantly contributed in revealing that knowledge management practices, management innovation and intellectual property protection have a substantial and constructive impact on entrepreneurial leadership, which in turn leads to sustainable growth in SMEs.

The study findings recommend that SMEs must focus on knowledge management practices, intellectual property protection and management innovation to nurture entrepreneurial leadership, which can lead to sustainable growth. SMEs can benefit from investing in knowledge management practices, protecting their intellectual property and innovating their management practices to achieve sustainable growth. Also, the absorptive capacity of an SME can help it to aggravate the impact of the above factors and lead them to sustainable growth faster.

The current work studies the association between knowledge management practices, intellectual property protection, management innovation, entrepreneurial leadership and sustainable growth in SMEs, thus contributing to the literature. The study provides insights into the factors that can nurture entrepreneurial leadership and contribute to sustainable growth in SMEs, which can inform policy and practice in the field of entrepreneurship.

Hospital governance accountability structures in Iran, similar to other countries, have undergone various reforms with different goals. The current study aimed to identify the rules and regulations of the hospital governance structure in Iran and how they pay attention to accountability.

This qualitative document content analysis study was conducted using hospital governance structure documents in Iran using the Ready materials, Extract data, Analyze data and Distil (READ) document analysis framework. 2,921 documents were extracted from the official government websites of Iran. After screening, seven documents related to the hospital governance structure were selected. A directed content analysis approach was used. The findings were finally future purification matched with the original documents.

The findings showed that documents had not addressed the inclusive governance structure of the hospital comprehensively. The medical staff organization structure is not considered in the documents, and its duties are assigned to a technical or a clinical director. Most documents addressed financial accountability. The documents did not require the hospital’s governance to have an inclusive accountability structure. However, they paid more attention to the administrative and financial autonomy of hospitals.

Accountability is one of the most essential components in the hospital's governance structure. It can increase the success of hospital efficiency, effectiveness, vision and mission fulfillment. The study result can help health services policymakers and managers formulate better organization structure rules and regulations for hospital governance accountability.

This study is the first qualitative analysis of accountable governance structure documents in Iranian hospitals. We used the READ method as a comprehensive approach for document analysis.

Because of the importance of having enough sleep in life and health, this study aims to determine the effect of vitamin D supplementation on sleep quality and pregnancy symptoms (primary outcomes) and side effects (secondary outcome).

In this triple-blind randomized controlled clinical trial, 88 pregnant women with gestational age of 8–10 weeks and serum vitamin D concentration less than 30 ng/ml were allocated into vitamin D (n = 44) and control (n = 44) groups by blocked randomization method. The vitamin D group received a 4,000 IU vitamin D pill, and the control group received a placebo pill daily for 18 weeks. Independent t-, Mann–Whitney U and ANCOVA tests were used to analyze the data.

The post-intervention mean (SD: standard deviation) of total sleep quality score in the vitamin D and placebo group were 1.94 (2.1) and 4.62 (1.71), respectively. According to the Mann–Whitney U test, this difference between the two groups was statistically significant (p < 0.001). The mean (SD) of pregnancy symptoms in the vitamin D and placebo groups was 23.95 (16.07) and 26.62 (13.84), respectively, and there was no significant difference between the two groups based on ANCOVA test (p = 0.56). Considerable side effects were not observed in any groups.

This study was conducted due to the contradictory results of the effect of vitamin D on sleep quality and the high prevalence of sleep disorders and pregnancy symptoms.

This paper aims to examine the relationship between corporate governance mechanisms and firm performance in Qatari non-financial firms over a nine-year period, including the period of high uncertainty caused by the COVID-19 pandemic.

The study uses data from Refinitiv and employs panel data econometric techniques, namely generalized least squares (GLS), to analyze the impact of board characteristics (board size, board meetings, board gender diversity, board-specific skills, board independence), audit committee features (existence of audit committee, audit committee independence), CEO duality and management scores on both accounting and market performance of Qatari firms. Control variables include firm size, age, leverage and industry classifications.

The findings suggest that board-specific skills positively influence firm performance, while board size and gender diversity exhibit a non-significant impact. Audit committee independence enhances accounting performance but does not significantly affect market performance. Surprisingly, management scores show a significant yet negative impact on certain financial measures, indicating the need for further investigation.

These insights provide valuable guidance for policymakers, investors and corporate leaders, emphasizing the importance of tailored governance practices in Qatar's unique business landscape.

This study provides unique insights into the governance-performance relationship in the context of Qatar, a region with limited existing research. The inclusion of the COVID-19 period adds a contemporary dimension to the analysis, highlighting the resilience and adaptability of corporate governance practices during times of crisis.

This study aims to analyze the effect of the board of directors on financial performance, either directly or indirectly, through the existence of risk management after the issuance of the Palestinian Code on Corporate Governance in Palestine.

This study uses a panel data of 31 Palestinian listed companies from 2010 to 2016. It also uses structural equation modeling (SEM) model.

The results of the SEM model show a significant positive relationship of the existence of risk management and the tenure-chief executive officer (CEO) with financial performance. However, CEO duality has a significant negative relationship with financial performance. The results also show a significant positive relationship of CEO duality and board size with financial performance through the existence of risk management.

This study adds to the existing literature by analyzing the effect of the board of directors on financial performance, either directly or indirectly, through the existence of risk management in Palestine, one of the youngest stock exchanges in the region, which assists in testing the validity of agency theory in a young and small emerging Islamic market context.

The results of this paper are significant for shareholders and managers of companies to make proper choices to secure the interests of stakeholders and increase the flow of capital and foreign investment.

To the best of the author’s knowledge, it is one of the first papers to investigate the effect of the board of directors on financial performance, either directly or indirectly, through the existence of risk management in Palestine.