Search in Publications
Found 6515 publications
Thalia dealbata, a new host of sugarcane mosaic virus
Publication Name: Journal of Plant Pathology
Publication Date: 2023-05-01
Volume: 105
Issue: 2
Page Range: 587-588
Description:
No description provided
Open Access: Yes
The Impact of Changes in Financial Supervision on the Profitability of the Hungarian Banking Sector
Publication Name: Economies
Publication Date: 2022-07-01
Volume: 10
Issue: 7
Page Range: Unknown
Description:
Since 2013, the central bank has been responsible for supervision in Hungary. In addition to the regulatory change, a law was published in the same year that started the process of abolishing the savings co-operative system. This paper investigates the impact of these two significant changes on the profitability of the Hungarian banking sector between 2003 and 2019 using dynamic panel model estimates. The supervisory change has reduced the profitability of credit institutions and tighter supervision has been implemented. The transformation of the savings co-operative system was in fact an integration that led to the disappearance of savings co-operatives by 2019. Competition in the market has been weakened, which has increased the profitability of the remaining financial institutions. The results were robust in terms of the multiple specifications and profitability ratio.
Open Access: Yes
Product design using a contact-optimization technique
Publication Name: Strojniski Vestnik Journal of Mechanical Engineering
Publication Date: 2007-07-01
Volume: 53
Issue: 7-8
Page Range: 442-461
Description:
It is well known that in engineering practice high stresses occur and that these stresses depend on the shapes and the loads of the bodies in unilateral contact. The stress distribution is often not smooth and has some singularities, thereby decreasing the lifetime of the machine elements. It is an important objective to obtain a smooth stress distribution when optimizing the shape of the elements. One of the goals of this paper is to present a method that resolves the above problem. By controlling the contact pressure a prescribed, smooth contact-pressure distribution can be achieved. The optimization problems take into account the limit stress constraints of the material. In the present paper two types of contact problems are investigated. Firstly, contact optimization problems are analyzed assuming linear elasticity and small displacements, including steady-state wear process. Two numerical examples are presented on this topic for a rolling machine element: a punch optimization and a shape optimization. We also investigated which parameter values of the controlling function result in the maximum loadability. This can be useful in the design of brakes or bearings. In the second part of the paper the solution of the contact problem for large displacements and deformations is investigated where an air-spring is analyzed by calculating the nonlinear load-displacement curve and comparing it with measurements. © 2007 Journal of Mechanical Engineering. All rights reserved.
Open Access: Yes
DOI: DOI not available
Examining the relationship between physical activity and sleep among university students
Publication Name: Frontiers in Sports and Active Living
Publication Date: 2025-01-01
Volume: 7
Issue: Unknown
Page Range: Unknown
Description:
Objective: Physical activity and adequate sleep are essential for health and wellbeing. University students face distinct challenges affecting their habits. This study investigates sociodemographic impacts on physical activity and sleep patterns, and examines the association between physical activity and sleep quality in Hungarian university students. Methods: An online cross-sectional survey was conducted among students (N = 1,340, mean age 20.00 ± 1.59 years; 60.7% female and 39.3% male) from the Budapest University of Economics and Business. The survey was based on sociodemographic data, the Hunarian version of the International Physical Activity Questionnaire-Short Form (IPAQ-SF), and the Pittsburgh Sleep Quality Index (PSQI) questionnaires. In IPAQ-SF, respondents indicated physical activities lasting at least 10 min during the last seven days. Responses were categorised by WHO and IPAQ guidelines. Metabolic Equivalent of Task (MET) was calculated. Statistical analyses were conducted using IBM SPSS Statistics 29.0.0.0, with significance set at p < 0.05. Results: Most participants (85.8%–86.9%) performed below the WHO recommendations for moderate-intensity physical activity. Significant sex differences were noted in physical activity levels (p < 0.001 for vigorous intensity; p < 0.043 for moderate intensity), with men being more active than women. Regarding sleep quality, 57.1% of participants reported good sleep quality (PSQI 0–5), 36.1% had moderate sleep disturbances (PSQI 6–10), and 6.8% experienced poor to severe sleep disturbances (PSQI 11–21). Women reported significantly poorer sleep quality than men did (p < 0.001). Multiple linear regression analysis revealed a significant interaction between energy expenditure on physical activity and sports participation frequency (β = −0.09, p = 0.012), indicating that regular sports participation may buffer against potential negative effects of high overall physical activity on sleep quality. The model explained 3.1% of the variance in sleep quality (R2 = 0.031, p < 0.001). Conclusion: The relationship between physical activity (MET-minutes/week) and sleep quality was moderated by the frequency of sports participation. Given that poor sleep can negatively impact academic performance, health, and well-being, these findings support the promotion of organized sports within university settings. Interventions targeting both physical activity and sleep hygiene may yield synergistic benefits, particularly for students with sedentary lifestyles.
Open Access: Yes
Analyzing the impact of geographical diversification on portfolio performance
Publication Name: Teruleti Statisztika
Publication Date: 2025-01-01
Volume: 15
Issue: 2
Page Range: 321-340
Description:
The portfolio theory, which originated in the 1950s, pointed out that portfolio diversification allows investors to reduce risk. However, in addition to sector diversification, geographical diversification has been considerably less emphasized in equity investment evaluation. Our study contributes to this area. The calculations were conducted over two periods: 2008–2013 and 2014–2019. We constructed our portfolio using only exchange-traded funds (ETFs). We created two portfolios: one geographically diversified and the other focused exclusively on European markets. The geographically diversified portfolio comprised the IEV (iShares Europe ETF), EWH (iShares MSCI Hong Kong ETF), and EWZ (iShares MSCI Brazil ETF) portfolios. For our analysis, we used an approach based on the Monte Carlo simulation. The simulation calculated the Sharpe ratio of the portfolios, annualizing the metrics using the 252 trading day approach. We performed 10,000 iterations to ensure the robustness and reliability of our model. In the first period (2008–2013), we found that the geographically diversified portfolio showed higher volatility and generally lower risk-adjusted returns than the non-geographically diversified portfolio focused on Europe. Conversely, in the second period (2014–2019), the geographically diversified portfolio outperformed the non-geographically diversified portfolio in terms of risk-adjusted returns, suggesting that geographic diversification is preferable in certain market environments, particularly during periods of economic growth. In conclusion, investors should explore the potential of geographic diversification.
Open Access: Yes
DOI: 10.15196/RS150206
Nexus between climate change, agricultural output, fertilizer use, agriculture soil emissions: Novel implications in the context of environmental management
Publication Name: Journal of Cleaner Production
Publication Date: 2024-04-15
Volume: 450
Issue: Unknown
Page Range: Unknown
Description:
In evaluating the influence of greenhouse gases (GHGs) on climate change, the effectiveness of carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O) is intricately tied to their atmospheric turnover rates, which play a crucial role in their heat-trapping capacity. Understanding the dynamics of how these gases cycle through the atmosphere is essential for assessing their respective contributions to the greenhouse effect and, consequently, their impact on global warming and climate change. The prime objective of this research is to examine the role of climatic change, agriculture output, and fertilizer use on the agriculture soil's greenhouse gas emissions. In doing so, the present study has focused on the temperature of land, fertilizer consumption, crop and livestock production, and energy used in agriculture soils on the pollution level of agricultural soils. The study further delineates the intricate interdependencies between climate change factors and GHG emissions using novel econometric methodologies, specifically the PMG-ARDL, SC-ARDL, and Dumitrescu Hurlin Panel Causality frameworks. In doing so, we use a large panel dataset spanning 1990 to 2020. The estimations show that climate change, as measured by variations in terrestrial temperature, has a discernible and positive impact on GHG emissions over the short and long term. Energy consumption and livestock production positively correlate with GHG emissions, with the former having a more pronounced effect. The implications of fertilizer usage and overall crop yield become noticeably significant in the long term. It emphasizes the importance of using a diachronic perspective when assessing GHG emissions in the agricultural sector. It is also worth noting that agricultural land use appears to negatively impact GHG emissions, emphasizing the importance of implementing sustainable land management practices to mitigate adverse environmental consequences. The study also explores the causality between climate change, agricultural practices, and GHG emissions, revealing a bidirectional association between climatic change and soil emissions. Additionally, unidirectional causation is observed from fertilizer consumption and crop production to emissions, underscoring the importance of adopting sustainable agricultural practices to reduce emissions. The findings offer valuable insights for governments and researchers to create sustainability-related strategies for dealing with climate change issues, safeguarding natural resources, and ensuring a sustainable future for agriculture.
Open Access: Yes
BEHAVIORAL IMPULSES AND THE TRANSMISSION CHANNELS OF THEIR IMPACT ON MACROECONOMIC STABILITY
Publication Name: Economics and Sociology
Publication Date: 2025-01-01
Volume: 18
Issue: 3
Page Range: 202-228
Description:
This study investigates the impact of behavioral impulses, specifically corruption perception and government effectiveness, on macroeconomic stability through fiscal transmission channels. A Vector Autoregression (VAR) model was used to analyze the impulse responses of key macroeconomic indicators, including tax revenues, state budget expenditures, and GDP per capita, to shocks in corruption perception and governance quality. The findings reveal that improvements in corruption perception initially boost tax revenues and economic growth but have diminishing effects over time, emphasizing the need for sustained policy enforcement. In contrast, government effectiveness has a delayed but more persistent impact on fiscal stability. The study challenges the greasing-the-wheels hypothesis, demonstrating that corruption weakens rather than facilitates economic efficiency. The study contributes to the literature on behavioral economics by demonstrating that public trust, shaped by corruption control and effective governance, plays a more pivotal role in maintaining macroeconomic stability than the previously acknowledged indicators of individual well-being.
Open Access: Yes
Three new Hutufeideria Hirschmann & Hiramatsu, 1977 from Southeast Asia, with the description of Hutufeideriidae fam. nov. (Acari, Mesostigmata)
Publication Name: Zookeys
Publication Date: 2026-01-01
Volume: Unknown
Issue: 1280
Page Range: 63-81
Description:
Three new species of the genus Hutufeideria are described from the Oriental region. The first species, H. perakensis sp. nov., was collected in Malaysia and differs from its congeners in the presence of a strongly sclerotized furrow on the dorsal shield and very long setae on the central area of the dorsal shield. The second species, H. sarawakensis sp. nov., was found in Sarawak (Malaysia) and differs from other species of the genus in the shape of the setae on the caudal part of the dorsal shield and the shape of the female genital shield. The third species, H. sumatraensis sp. nov., was collected from Sumatra (Indonesia) and has a tile-like sculptural pattern on the ventral shield; the dorsal shield is covered with large and irregular pits, and bears serrate setae on the caudal margins of the dorsal shield; these represent a unique character combination within the genus. Hutufeideriidae fam. nov. is diagnosed, with Hutufeideria as the type genus. A list of known species is provided.
Open Access: Yes
Examining gender equality in tourism management for Hungarian regions
Publication Name: Statisztikai Szemle
Publication Date: 2025-01-01
Volume: 103
Issue: 11
Page Range: 1094-1110
Description:
This study explores the impact of gender inclusivity on workplace experiences among female leaders in the Hungarian tourism management sector, with a particular focus on perceived discrimination, job insecurity, and family-related obligations. Employing a mixed-methods approach, the research combined structured questionnaire data (n = 102) with qualitative insights derived from thematic content analysis of open-ended responses. Analytical methods included descriptive statistics, ANOVA, regression analysis, and cluster analysis. Findings indicate that 75% of respondents reported gender-based discrimination, especially in promotion processes, while 65% identified family responsibilities as significant barriers to career advancement. Marked regional differences emerged: Central Hungary exhibited a more inclusive work environment, with lower levels of perceived discrimination and greater job security compared to northern regions. Inclusive organizational practices were positively associated with career satis faction and tourism-related performance. The results underscore that advancing gender equality is not only a matter of social justice but also a key determinant of economic performance and regional competitiveness. The study recommends reinforcing family-friendly and inclusive workplace cultu res and calls for regionally differentiated policy interventions.
Open Access: Yes
