Iskanje po katalogu digitalne knjižnice

Opis: This paper presents a novel approach for modeling non-Fourier dual-phase-lag bioheat transfer in multilayer biological tissue, aimed at simulating dynamic thermography for the early detection of skin tumors at Clark II and IV stages. The proposed algorithm, based on the boundary element method, enables the assignment of distinct thermophysical properties and non-Fourier relaxation time parameters to each tissue layer, thereby enhancing the realism of bioheat transfer modeling. Results show that accounting for non-Fourier effects significantly impacts the transient thermal contrast between tumor and healthy skin, particularly in Clark IV tumors and at higher relaxation times. These findings support the development of more accurate and physiologically realistic models of heat transfer in complex biological structures, and advance the application of dynamic thermography in early skin tumor detection and the diagnosis of other dermatological conditions.
Ključne besede: numerical modeling, non-Fourier heat transfer, bioheat transfer, dual-phase-lag model, boundary element method, dynamic thermography
Objavljeno v DKUM: 03.11.2025; Ogledov: 0; Prenosov: 5
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Opis: Purpose: The purpose of the study is to better understand the relationship between dynamic capabilities and firm competitive performance, and how innovation capabilities, specifically (a) product capability and (b) process capability, may play a mediating role in this relationship. Design/Methodology/Approach: Simple Random Sampling technique was adopted to choose SMEs to collect data based on information obtained from Hungarian SMEs associations. A total of 565 completed questionnaires were obtained, with response rate of 65.50%. Confirmatory factor analysis (CFA) was used with AMOS 24 to assess the reliability and validity; and Cronbach’s alpha coefficient was additionally used to assess the dependability of the scales. The proposed model was put to the test using structured equation modelling (SEM). Results: The study results show that dynamic capacities have a significant direct effect on innovation capabilities: product capability and process capability. The study also proves that both product capability and process capability have a significant impact on a firm’s competitive performance. Conclusion: The study concludes that the relationship between dynamic capabilities and competitive firm performance is partially mediated by innovation capabilities. The study suggests that before enhancing product innovation capability, entrepreneurs should consider reorganizing and reallocating resources into process innovation capability. This study contributes to our understanding of the mediating mechanism of innovation capabilities through which dynamic capabilities enhance firm competitiveness performance.
Ključne besede: innovation capabilities, dynamic capabilities, competitive firm performance, technological innovations
Objavljeno v DKUM: 11.08.2025; Ogledov: 0; Prenosov: 1
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Opis: Background/Purpose: This study examines the relationship between dynamic capabilities (DCs) and environmental performance (EP) in high-tech SMEs in Pakistan, focusing on the key dimensions of sensing, seizing, and reconfiguration. Additionally, it explores the mediating role of environmental innovation (EI) and the moderating effect of female leadership on this relationship. Methods: A quantitative research approach was employed, using a structured questionnaire distributed among male and female Chief Executive Officers (CEOs), senior management personnel, and executives in high-tech SMEs. Data were analysed using structural equation modelling (SEM) to assess the relationships between DCs, environmental innovation, and environmental performance. Results: The findings indicate that seizing capabilities significantly enhances environmental performance, with a one-point increase leading to a 0.282-point improvement. Similarly, reconfiguration contributes positively, with a one-point increase resulting in a 0.227-point improvement. Both process innovation (path coefficient = 0.384, p = 0.001) and product innovation (path coefficient = 0.157, p = 0.043) positively influence environmental performance. However, female leadership did not exhibit a significant direct effect on environmental performance. Notably, female moderators negatively impacted the relationship between process innovation and environmental performance (-0.328), suggesting that in lower hierarchical positions, female inclusion may reduce the effectiveness of process innovation in achieving sustainability goals. Conclusions: The study provides empirical evidence on the role of dynamic capabilities and environmental innovation in enhancing sustainability in high-tech SMEs. It highlights the need for firms to strengthen their seizing and reconfiguration capabilities to improve environmental performance. Additionally, eco-innovation should be encouraged, and gender diversity in leadership should be strategically considered when designing innovation and sustainability strategies. These findings offer valuable insights for policymakers and industry practitioners aiming to foster sustainable business practices in high-tech SMEs in Pakistan.
Ključne besede: dynamic capabilities, environmental performance, high-tech SMEs, eco-innovation, female leadership
Objavljeno v DKUM: 07.08.2025; Ogledov: 0; Prenosov: 1
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Opis: Background/Purpose: This paper examines the significant differences in market returns between the US and EU banking sectors following the 2008 financial crisis. The analysis reveals that the profitability of US banks, measured by return on equity, is higher than that of European banks, partially explaining the observed differences in returns. Methodology: The study employs two unbalanced panels of data for EU and US banks covering the period 2008- 2022. Static and dynamic estimators were used to identify significant determinants of bank profitability that include the impact of the profitability trend in the observed period on future profitability. Results: Based on a sample of 250 banks, operational efficiency, diversification, and risk were found to influence the profitability of banks in both regions. For European banks, past profitability, the share of deposits and loans in assets, and inflation were also found to exert influence. On the other hand, American banks exhibit a higher predictive power for these variables, confirming the differences in determinants between the two markets. Although risk partially explains the higher profitability of American banks, other results did not confirm the original hypothesis. Conclusion: The main contribution of the paper is a direct comparison of the determinants of profitability for EU and US banks using static and dynamic models in the post-2008 financial crisis period. In addition, the existing methodology of static models with dynamic estimators has been extended by WLS models and robust estimators, and it was shown that there are certain determinants influencing their profitability that should be extended and subsequently examined.
Ključne besede: profitability, EU/US banks, panel data, static models, dynamic estimators
Objavljeno v DKUM: 04.08.2025; Ogledov: 0; Prenosov: 9
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Opis: This paper presents a combined modeling approach to evaluate the ecological effects on the habitat of an upstream tributary of a river with a series of hydropower plants. The influence is investigated of the last planned hydropower plant to be built, which has a large impact on the river ecosystem. The new hydropower plant basin will affect the tributary with hydropeaking in the upstream basin. A simulation was conducted of spawning conditions for two protected fish species. The analysis combined a hydro-morphological model with a fish module that considers the water depth and velocity necessary for fish reproduction. The different river discharge scenarios were simulated, incorporating the hydropeaking effects of the new hydropower plant basin on the upstream tributary. With the new hydropower plant, sustainable measures are planned to prevent the damaging negative impacts that could lead to the degradation of the river ecosystem and the destruction of the existing ecosystem at the river’s confluence. The results indicate that, after the hydropower plant begins operation, the habitat`s suitability will decrease, and the planned sustainable measures will not provide a fully satisfactory solution.
Ključne besede: environmental impact, habitat sustainability, hydro-dynamic model
Objavljeno v DKUM: 11.04.2025; Ogledov: 0; Prenosov: 39
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