The aim of this study is to examine the impact of key competitiveness factors on sustainable business performance in the hospitality sector through the application of an integrated approach, from the perspective of hotel service users. The research was conducted on a sample of 1640 hotel guests who stayed in hotels operating in the Republic of Serbia, Croatia, and Slovenia. Utilizing a structural equation modeling (SEM) framework, the study meticulously analyzed various competitiveness factors: service quality, service, service recovery, hotel user satisfaction, loyalty and discretionary behavior and dysfunctional consumer behavior. The results of the research reveal that all identified key factors significantly impact the sustainable performance of hotel operations. The findings suggest that hotels must prioritize these elements to enhance their competitiveness and ensure ongoing success in a challenging market environment. Notably, one intriguing finding is that loyalty does not serve as a buffer in the relationship between customer dissatisfaction and dysfunctional behavior, indicating that even loyal customers can exhibit negative behaviors when their expectations are not met. This underscores the importance of addressing guest satisfaction proactively to mitigate potential adverse outcomes and retain a loyal customer base. Moreover, this study provides valuable insights for hotel management, highlighting the necessity for holistic strategies that not only aim to improve guest experiences but also consider the intricate dynamics between various competitiveness factors that ultimately contribute to the sustainability and profitability of the hospitality industry. Rejecting the sub-hypothesis that loyalty among hotel service users moderates the impact of dissatisfaction on the expression of dysfunctional consumer behavior indicates the need to review certain theories that comprise the dominant theoretical framework in the field of hospitality. This implies the need for further analysis of the validity of the dominant theories in the hospitality industry, especially in defining the conditions under which their postulates hold indisputably. Second, further examination of the role of loyalty is needed, since there are different types of loyalty.

The storage of CO₂ has become an important worldwide problem, considering that an excess of CO₂ in the Earth’s atmosphere causes dramatic changes in its climate. One possible solution is to remove the excess of CO₂ from the atmosphere, capture it in the process of creation, and store it safely, negating the possibility of its return into the atmosphere. This is the process of Carbon Capture and Storage (CCS). In the following paper, the authors investigate horizontal saline aquifers and their ability to store CO₂. The authors’ application of sensitivity analysis on horizontal migrations uncovered that CO₂ permeability and aquifer porosity have a considerable impact on horizontal migrations. During the migration process, CO₂ can reach tens of kilometers from its injection point. By introducing effective CO₂ density to the conduction velocity term, the authors showcase that the convection-diffusion equation for compressible fluids can be replaced with the equation for incompressible fluids. The buoyancy factor in convective velocity is as density dependent as in conduction velocity. By means of introducing an effective density to the aforementioned term, the process of transport via variable convective velocity can be substituted for a process which is effective, constant, and not density dependent.

This paper aims to empirically test the impact of the relationship between the rules concerning the protection of employees and the unemployment rate. The aim is to answer the question of whether there is a positive or negative relationship between stricter employment protection regulation and unemployment, and whether it is statistically significant. The methodology used is from the panel data analysis of the multifactorial regression model with fixed and random effects and the generalized method of moments (GMM) model. Fella (2000) and the Organisation for Economic Co-operation and Development (OECD, 2004), find that any tightening of regulations regarding the protection against individual dismissals of 1 percent, measured through the indicator of the stringency of employment protection — individual dismissals leads to a decrease of unemployment of 1.774 percent. Fujita and Nakajima (2016) point out that the employment rate is procyclical, while the unemployment rate is countercyclical. The research was conducted using secondary data with panel data analysis for 24 countries, 19 of which are current members of the Common Market for Eastern and Southern Africa (COMESA). The results of the endogeneity test show that there are no endogeneity variables (p-values: 0.372, 0.434, and 0.110, retrospectively for the variables scd, sid, and tc).

The purpose of this paper is to examine the influence of the most significant organizational factors on primary school achievements, with a note that the achievement of the school is expressed through the quality of outcome knowledge. The research was conducted on a sample of 460 employees, from 21 primary schools, of which 439 are professionals and 21 are principals in the South Bačka County, Republic of Serbia. The collected data were processed using the Gretl software and AMOS for modelling structural equations. More precisely, the research is based on the application of exploratory and confirmatory factor analysis. A neural network based on a standard multilayer perceptron model was used in the paper to test the validity of the obtained results of the AMOS model. The results of the research show that school management is the most important factor in school achievement and that this influence is most pronounced through teaching staff and school infrastructure. The results, also show that teachers’ competencies have the strongest direct influence on the quality of outcome knowledge. The results obtained indicate that decision-makers and creators of social policies must pay special attention to the selection of school principals as well as their professional education, while school principals to the selection of teachers. Future researchers are recommended to use the Sobel test to precisely determine the indirect influences of school management on school achievement.