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Found 6407 publications
Numerical study on the micro-mechanical behaviour of artificial granular materials
Publication Name: Fib Symposium
Publication Date: 2020-01-01
Volume: Unknown
Issue: Unknown
Page Range: 86-93
Description:
Numerical models for the simulation of the micro-mechanical behaviour of granular assemblies have a wide range of applications, for instance in material science, process engineering, environmental engineering, railway engineering and geotechnical engineering (in this study we examined one macro-grain but what important is behaviour of granular assemblies). In this examination, experimental tests and numerical computations using the discrete element method (DEM) are carried out to evaluate the micro-mechanical behviour of the granular materials. For this purpose, artificial materials are taken into consideration for experimental Brazilian laboratory tests, and then according to the experimental results the DEM model is calibrated. Artificial crushable materials are produced by mixing cement and silt according to their mass ratio, in which cement can provide bonding and silt is the main filling material. In the DEM model, a 3D crushable granular material ‘macro-grain’ is built up from a large number of micro-grains which are associated according to crushable parallel bond properties. The behaviour of the single crushable grains and the fragmentation patterns under different contact configuration and load position are studied. The DEM simulation results show that the contact configuration type and load position affect the fragmentation patterns and loading capacity.
Open Access: Yes
DOI: DOI not available
Exploring the Link Between Ride-Sharing Experience and Autonomous Vehicle Acceptance in the Context of Sustainable Mobility †
Publication Name: Engineering Proceedings
Publication Date: 2025-01-01
Volume: 113
Issue: 1
Page Range: Unknown
Description:
Sustainable transportation systems are becoming an increasingly important issue around the world, especially with the advancement of urbanisation. Autonomous vehicles and ride-sharing services represent innovative mobility solutions that can improve not only the efficiency of transportation but also its environmental sustainability. The aim of this study is to examine Hungarian consumers’ attitudes toward ride-sharing and their acceptance of AVs, with a focus on whether there is a link between the two phenomena. The research is based on a nationally representative sample of 2000 respondents. Correlation analyses were performed based on the dimensions of technology acceptance models. Based on the results, a significant positive correlation can be demonstrated between the willingness to use ride-sharing services in the future and the openness towards AVs. Perceived usefulness and social influence showed the strongest relationship with intention of usage. The results contribute to the social acceptance of autonomous technologies and sustainable transport in Hungary.
Open Access: Yes
Rediscovering Visualization - Towards an up-to-date conceptual framework for promoting learning of Mathematics in engineering education
Publication Name: Sefi 47th Annual Conference Varietas Delectat Complexity is the New Normality Proceedings
Publication Date: 2020-01-01
Volume: Unknown
Issue: Unknown
Page Range: 667-679
Description:
Students in engineering education need tools to gain insight into the ever-increasing complexity of engineering problems and possible solutions in the 21st century (e.g. seeking the reasons for the recent bridge-collapse in Genova). One of these tools could be the utilization of mathematical knowledge and skills - but many engineering students are undermotivated in studying mathematics. Not only Comenius but our digital age also prefers visualization over textual comprehension, as the Net generation is visually literate. Newer interdisciplinary research findings in brain functions and brain maturation are worth to be integrated into the pedagogy of teaching mathematics to engineers. Methodologically, in order to improve the quality of teaching Mathematics in engineering education at a Hungarian university, both findings in brain-research as well as theories of adult learning have been analysed from the perspective of visualization. The other direction of the work was focused on different types of visualization in Mathematics (according to Guzman), particularly in textbooks for engineering students. Ten textbooks, (among them the newly developed „Mathematics 1” at the Széchenyi István University), available both in print and online in Hungary have been compared from visual aspects. The current Curriculum of the subject „Mathematics 1” has also been analyzed from visual aspects. Findings show the need for a wider variety of visualization. Systematically detailing all of the above-mentioned perspectives and findings of data-processing contribute to developing an up-to-date conceptual framework for improving the quality of teaching Mathematics in engineering education at a Hungarian university, and it might be useful for other universities as well.
Open Access: Yes
DOI: DOI not available
Bringing Vicia villosa, V. pannonica, V. sativa, Trifolium incarnatum and T. alexandrinum into cultivation in Hungary: a historical review
Publication Name: Botanikai Kozlemenyek
Publication Date: 2025-01-01
Volume: 112
Issue: 1
Page Range: 61-86
Description:
We review the history of arable naturalization and initial cropping of five legume species in Hungary in the period between the 19th and the first half of the 20th century. Nowadays, these species have an increasing importance as green manure and seed production. The cultivation of Vicia villosa Roth, an old established plant in the Carpathian Basin of Near Eastern origin, was started for green forage, mainly owing to encouraging experiences in Germany. It produced good yields even among unfavourable weather and edaphic conditions. Although Vicia pannonica Crantz is likely native to Hungary, it was brought into cultivation due to reports of satisfactory farming experiences from the USA. It had a good seed production capacity and also provided tasty forage in Hungary as well. Vicia sativa L. was probably cultivated already in the Neolithic, Bronze and Iron Ages in the Carpathian Basin. Later, in the transitional period between the three-field system and crop rotation, its foreign cultivars were re-naturalised and sowed into the fallow as a forage crop. Trifolium incarnatum L., a plant of Mediterranean origin, was first cultivated in Hungary as a stubble–sowed crop, or for clover replacement, but later it became a relevant seed–export item. The seeds of Trifolium alexandrinum L. for its first Hungarian field experiments probably came directly from Africa. Mostly, it was cropped as a secondary sowed forage in irrigated fields and as a shift crop in rice growing areas.
Open Access: Yes
Classifying Genetic Lines in Pork Production by Ileal Crude Protein and Amino Acid Digestibility in Growing Pigs
Publication Name: Animals
Publication Date: 2023-06-01
Volume: 13
Issue: 12
Page Range: Unknown
Description:
The first aim of the study was to evaluate the effect of different dietary lysine (LYS) to energy (DE) ratios on the apparent ileal digestibility (AID) of crude protein (CP) and selected amino acids (AA) in growing pigs (40–60 kg) of different genotypes. The second aim was to classify genotypes into groups based on the AID of CP and AAs. The trials were conducted on a total of 90 cross-bred barrows (30 animals/genotype) in two replicates. Before the trial series, the experimental animals (average initial body weight (BW) = 40.9 ± 8.5 kg) were surgically fitted with post valve T-cannula (PVTC). The diets were formulated with six different total LYS/DE ratios. Titanium dioxide (TiO2 ) was added to the diets (5 g/kg) as an indigestible marker. Based on our results, it can be concluded that the LYS/DE ratio of the diets affected the AID of the CP and AA in different ways by each genotype (p < 0.05). It can also be concluded that pigs of different genetic potential can be classified with a high accuracy (91.7%) in respect of their CP and AA digestive capacity. Our results indicate the development of genetic-profile-based swine nutrition technologies as a future direction.
Open Access: Yes
DOI: 10.3390/ani13121898
Sustainable closed-loop supply chain network design under uncertainty using a fuzzy multi-objective optimization framework for the battery industry
Publication Name: Scientific Reports
Publication Date: 2026-12-01
Volume: 16
Issue: 1
Page Range: Unknown
Description:
The study presents a sustainable closed-loop supply chain network that integrates financial, environmental, and social objectives within a context of uncertainty. A fuzzy-based modeling approach is introduced to address uncertainty in customer demand, cost parameters, and carbon emission coefficients across the sustainable closed-loop supply chain network. Two metaheuristic methods, the non-dominated sorting genetic algorithm II (NSGA-II) and multi-objective particle swarm optimization (MOPSO), are employed to address the problem and are compared against each other. A practical case study of a battery company is employed to validate the framework. The findings indicate that MOPSO surpasses non-dominated sorting genetic algorithm II in terms of solution quality and computational efficiency, compared with NSGA-II, the proposed MOPSO achieved a 6.3% reduction in total cost and an 8.1% decrease in CO₂ emissions, while the social index reflecting recruitment and employee security increased by 12.5%. This study contributes a sustainable closed-loop supply chain network design model for the battery industry that together optimizes economic, environmental, and social objectives amid parameter uncertainty, and offers algorithmic evaluations of optimized multi-objective metaheuristics to achieve high-quality Pareto solutions.
Open Access: Yes
THE ROLE OF TOURISM MANAGEMENT FOR SUSTAINABLE TOURISM DEVELOPMENT IN NATURE RESERVES IN HUNGARY
Publication Name: Geojournal of Tourism and Geosites
Publication Date: 2023-01-01
Volume: 49
Issue: 3
Page Range: 893-900
Description:
The aim of the research is to reveal the opinion of regional professionals involved in the management of sustainable tourism and its three pillars. Through the results of 27 in-depth interviews with decision-makers and NGOs, we have explored the perceptions of the economic, environmental and social factors, both positive and negative, and the importance of each factor. The analysis of the results clearly shows a difference of opinion between decision-makers and NGOs. The negative impacts of tourism were highlighted by respondents, mainly in terms of the impact on the natural and economic environment, however, the positive impacts were more prominent. The research showed that the impacts on social environment were perceived more positively by respondents, and NGOs did not emphasise negative impacts in this category. The study shows that the role of tourism management in nature conservation areas is necessary and important for sustainable tourism development. The research clearly demonstrates that sustainability is an important issue in tourism. The results of the research also show that decision-makers are not familiar with the concept of sustainability, its precise content and their preparation and knowledge are insufficient to make the right decisions on the subject. The research shows that there is a shortage of professionals with expertise in tourism management, which makes it difficult to implement coordinated tourism development in the area under study.
Open Access: Yes
Exploring the competitiveness of tourism in Hungary: Recent findings and results
Publication Name: Journal of Infrastructure Policy and Development
Publication Date: 2024-01-01
Volume: 8
Issue: 10
Page Range: Unknown
Description:
This research evaluates the regionalization of tourism in Hungary, revealing the breakdown of the national gross domestic product (GDP) of tourism. It also explores the density, spatial variations, and features of these indicators. A multimodal approach is used to evaluate the competitiveness of Hungarian counties, and the distribution of these tourism regions is analyzed using the tourism penetration index. Furthermore, regional GDP is calculated for the whole territory of Hungary. The study identifies significant regional disparities in tourism competitiveness, highlighting Budapest-Central Danube as the most competitive region and Lake Balaton as underperforming despite its potential. The research contributes by providing a detailed regional GDP analysis and emphasizing the need for targeted policy interventions to enhance tourism development across all regions.
Open Access: Yes
The impact of coordination skill development on Year 4 pupils’ mathematics performance and engagement
Publication Name: International Journal of Educational Research
Publication Date: 2026-01-01
Volume: 137
Issue: Unknown
Page Range: Unknown
Description:
Classroom lessons supported by physical activity improve primary school children's cognitive levels, attention and engagement. Research demonstrates that incorporating the development of coordination skills and associated tasks into mathematics lessons leads to positive changes in students' behaviour and their willingness to engage with tasks. The use of innovative tools and methods to support movement-based development in the classroom remains an under researched area. Therefore, the aim of this study is to evaluate the effectiveness of an innovative sports tool and its associated motor coordination-based methods in the teaching of mathematics to Year 4 primary school students. Pupils from a primary school in a county town participated in the study. The sample was divided into experimental group ( n = 28) and the control group ( n = 27). The innovative coordination tool and its specific teaching methods was employed to support the teaching and learning process in mathematics over a 10-week programme. The effectiveness of this non-traditional educational tool was assessed through algebra and geometry worksheets completed before and after the intervention. Additionally, interviews were conducted with teachers and school leaders to gain insight into understand the broader impact of the intervention on the school. According to repeated ANOVA analysis, a small effect was detected for the variables of time and group. Additionally, a large effect was observed between the pre- and post-measurement within the groups, alongside a small effect between the groups. Significant improvements in both algebra and geometry variables were found in the experimental group from pre- to post-measurement, whereas no significant differences were observed in the control group. In-depth interviews corroborated the effectiveness of the innovative sports system across cognitive, affective and social domains, from both managerial and teaching perspectives. Based on the findings of this study, it can be concluded that 10–15 min of the coordination development programme inserted into lower primary school classroom activities over a 10-week period resulted in significant improvements in academic achievement and engagement in mathematics.
Open Access: Yes
