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Authors - 9808
László Nádai
6507247374
Marian L. Mocan
53363964700
Erzsébet Háznagy-Radnai
8704516800
Norbert Bozsik
57212080679
Publications - 6374
Oil Sorption Properties of Centrifugally Spun Polyisobutylene-Based Thermoplastic Elastomer Microfibers
Publication Name: Polymers
Publication Date: 2024-09-01
Volume: 16
Issue: 18
Page Range: Unknown
Description:
Fiber-based sorbent materials are an essential part of containing oil spills, thus preventing ecological damage. Poly(styrene-b-isobutylene-b-styrene) thermoplastic elastomer fibers were successfully produced by centrifugal spinning. Scanning electron microscopy revealed that the fibers were bead free and smooth-surfaced, with an average fiber diameter of 5.9 ± 2.3 μm. Contact angle measurements proved the highly hydrophobic (water contact angle of 126.8 ± 6.4°) and highly oleophilic nature of the fiber mat. The sorption and retention capacities of the fiber mat were tested for various oils and benchmarked against polypropylene as the industry standard and polystyrene, which is widely used in the literature. The oil uptake of the fiber mat showed a strong correlation with the viscosity of the oil, resulting in sorption capacities of 10.1 ± 0.8 g/g for sunflower oil, 19.9 ± 2.1 g/g for motor oil, and 23.8 ± 1.8 g/g for gear oil. Oil–water separation tests were also conducted, resulting in ~100% oil removal. The thermoplastic elastomer fiber mat outperformed the industry standard; however, the polystyrene fiber mat demonstrated the best oil sorption performance.
Open Access: Yes
Towards closed-loop concrete recycling: Life cycle assessment and multi-criteria analysis
Publication Name: Journal of Cleaner Production
Publication Date: 2023-07-15
Volume: 410
Issue: Unknown
Page Range: Unknown
Description:
In this study, a wide-ranging life cycle assessment and multi-criteria analysis for close-loop cycling of concrete are conducted. Considering six performance keys in the technical (compressive strength at short and long ages), environmental (human health, ecosystem quality, climate change, resources), and economic (costs), a solid framework is created and analyzed by three multi-criteria decision-making techniques, namely, TOPSIS, VIKOR, and EDAS. The weight that must be taken into account for each of the applied criteria depends on the specific application and the demands of the user. Nevertheless, two different weighted methods, namely, the equal performance method and the entropy method, have been employed in this work to optimize for various construction-related applications, specifically sustainable residential buildings and residential housing. The findings demonstrate that the concrete mixtures produced with 20% FA+12% SF and MRCA incorporation are the best in terms of the criteria used for all applied techniques and the two weighted methods. This study demonstrates that multi-criteria decision-making techniques are simple to apply, requiring minimal time and effort and focusing on the finished result, allowing users to choose the best concrete mixtures. The proposed framework recommends the closed-loop recycling of concrete by introducing supplementary cementitious materials for sustainable, economical, and performance-based design applications.
Open Access: Yes
Stability focused evaluation and tuning of special ground vehicle tracking algorithms
Publication Name: IFAC Papersonline
Publication Date: 2023-07-01
Volume: 56
Issue: 2
Page Range: 9282-9287
Description:
This paper deals with a special tracking problem when a ground vehicle should be tracked by a multicopter flying ahead of the vehicle. Pre-designed vehicle route is assumed and the UAV stops or slows down at every intersection to react to route changes. After introducing the problem, the methods applied in a real flight demonstration in the Smart City module of ZalaZONE proving ground are presented. Then new methods are introduced to possibly improve performance. The main focus of the article is the evaluation of the stability of the methods and the provision of tuning guidelines. All of the introduced methods is tuned based-on the guidelines considering real ground vehicle test data and the high fidelity simulation of the applied multicopter. The two best methods are compared in detail and guidelines of their applicability are provided.
Open Access: Yes
Time of application and cultivar influence on the effectiveness of microalgae biomass upon winter wheat (Triticum aestivum L.)
Publication Name: Cereal Research Communications
Publication Date: 2024-09-01
Volume: 52
Issue: 3
Page Range: 1153-1161
Description:
The capability of microalgae had been studied for a long time; however, some basics of using microalgae as a biostimulant are still in question. In the present work, experiments were conducted to reply to questions such as (a) how does the application time affect the effects of microalgae treatments and (b) does variety or genetic variation cause differences in the effect of microalgae biomass application on the plants? The different times of application had different weightage on different parameters; however, when applied at the early reproductive stage the yield as well as the nitrogen % in grain was significantly affected. As per the comparison, the result suggested that varietal differences had negligible differences in biological yield, hexose content, and total phenol content. Furthermore, microalgae biomass treatment irrespective of the strain species or genus influences the biological photosynthate accumulation and nitrogen uptake or in short, the efficiency of uptake. Finally, the metabolomic analyses suggested the influence of the microalgae strains on the biochemical composition of the plants.
Open Access: Yes
The Concept of Financial Stability in Theory and Law
Publication Name: Financial and Economic Review
Publication Date: 2023-06-28
Volume: 22
Issue: 2
Page Range: 54-76
Description:
State intervention in the functioning of the economy is necessarily based on some public interests, which may serve as a reason for restrictive state action against the individual, or their freedoms and rights. In legislation, financial stability can be identified as a form of public interest, whereby the need to define the substance of the concept is expressed as an expectation towards the legislator, all the more so because it forms the basis of significant administrative intervention of the public authority type. The study analyses how the concept of financial stability appears in the literature, in legislation and in legal enforcement. Although the concept of financial stability is strongly reflected in the theoretical literature and even in legislation and legal enforcement, its substance is difficult to capture and has evolved constantly. In view of the above, the author offers a definition for the general legal concept of financial stability.
Open Access: Yes
DOI: 10.33893/FER.22.2.54
Mental and physical health of yoga practitioners women in relation to exercise parameters
Publication Name: Mentalhigiene Es Pszichoszomatika
Publication Date: 2023-05-19
Volume: 24
Issue: 1
Page Range: 58-74
Description:
Introduction: Numerous international studies have shown that yoga practice has a positive effect on the physical and mental condition of healthy people and can play a role in the complementary treatment of certain diseases with appropriate guidance. Research on yoga practitioners has found positive correlations between several health indicators and the frequency of yoga practice and, in part, the yoga practice time. In terms of women s health, yoga has been shown to have a positive effect in relieving depression, anxiety and stress and several somatic symptoms. Objective: The aim of our study is to assess the subjective mental and physical symptoms of the health of Hungarian women practicing yoga, and to examine the associations between these variables between groups separated by yoga time and frequency. Methods: The study sample consisted of 457 healthy women with a mean age of 42.28 years (SD = 11.72), yoga practitioners 72%, and yoga instructors 27.7%. The Depression Anxiety Stress Scale-21 (DASS-21), Positive and Negative Affect Schedule (PANAS), Self-rated Health, and the Patient Health Questionnaire Somatic Symptom Severity Scale (PHQ-15) were used to measure the variables. Differences between the formed groups were analyzed by Kruskal-Wallis H and Mann-Whitney U tests. Results: We found a statistically significant difference between the three yoga time groups (beginner 1-6 months, intermediate 7-35 months, advanced ≥3 years) in depression (x2(2, n = 457) = 23.205, p < 0.001), anxiety (x2( 2, n = 457) = 9.489, p = 0.009), stress (x2(2, n = 457) = 27.224, p < 0.001), positive affect (x2(2, n = 456) = 7.689, p = 0.021), negative affect (x2( 2, n = 456) = 46.177, p < 0.001), self-rated health (x2(2, n = 457) = 28.862, p < 0.001) and somatic symptoms (x2(2, n = 455) = 26.022, p < 0.001) score. We also found a significant differences between the two yoga frequency groups (1-2 times per week and 3-7 times per week) in depression (U(1) = 19148.50, n1 = 161, n2 = 295, Z =-3.508, p < 0.001), stress (U(1) = 19588.50, n1 = 161, n2 = 295, Z =-3.107, p = 0.002), positive affect (U(1) = 18189.00, n1 = 161, n2 = 294, Z =-4.090, p < 0.001), negative affect (U(1) = 18456.50, n1 = 161, n2 = 294, Z =-3.894, p < 0.001), self-rated health (U(1) = 18244.00, n1 = 161, n2 = 295, Z =-4.873, p < 0.001) and somatic symptoms (U(1) = 19777.50, n1 = 160, n2 = 294, Z =-2.817, p = 0.005). A medium effect size difference was observed for negative affectivity and small effect size differences were observed for the other measured variables. Conclusions: Yoga could be recommended for relieving depression, anxiety, stress, and somatic symptoms, as well as a possible coping strategy for dealing with stress for healthy women. The results suggest that prolonged yoga practice (in years) or repeated physical exercises of yoga (asana) several times a week (3 or more times) may provide the greatest health benefits.
Open Access: Yes
Operational optimisation of integrated solar combined cooling, heating, and power systems in buildings considering demand response and carbon trading
Publication Name: Energy Conversion and Management
Publication Date: 2024-09-01
Volume: 315
Issue: Unknown
Page Range: Unknown
Description:
The Solar Combined Cooling, Heat, and Power (S-CCHP) system offers a promising solution to the energy crisis and environmental concerns. Its operation optimisation is essential due to intermittent solar irradiation. However, previous studies have concentrated on the “electricity-heating” subsystem and economic costs, with less emphasis on the integrated system's broader benefits and environmental impact. This study introduces an operational optimisation approach across “electricity-heating-cooling-gas” subsystems based on the design extension of the Residential Building Heating and Electricity Production (RESHeat) system. Specifically, the approach optimises operation from both the demand and supply sides, incorporating the demand response (DR) and Ladder Carbon Trading (LCT) on the demonstration in Limanowa, Poland, to balance economic and environmental impacts. The results show that the optimised electricity is reduced by 0.71 % per day while heating and cooling demands rise by 0.57% and 0.91%. PV/T panels provide 87.11% of electricity, with excess sold back to the grid in summer. DR combined with LCT in the extension design contributed to cutting costs by 16.15 % and CO2 by 57.79% compared with the initial design, underscoring the efficacy of collaborative operational in enhancing both economic and environmental performance.
Open Access: Yes
Analysis of Road Users’ Risk Behaviors in Different Travel Modes: The Bangkok Metropolitan Region, Thailand
Publication Name: Infrastructures
Publication Date: 2023-04-01
Volume: 8
Issue: 4
Page Range: Unknown
Description:
This study explores road users’ behaviors and accident analyses on different travel modes in the Bangkok Metropolitan Region (BMR). The questionnaire survey was adopted and designed based on contributing factors related to risk behavior perceptions in different travel modes. A total of 3000 participants submitted questionnaires that provided data for a multiple regression model analysis. The results indicated that different travel modes have different risk behavior perceptions. Road users of vulnerable modes of travel, such as walking and cycling, were more aware of risky behaviors than users of others. Risky, violent behavior may occur due to fatigue, driving while taking drugs, or aggressive tactics where the driver may lose control and cause an accident. However, driver negligence, especially violating traffic rules, may sometimes cause risky behavior. The results show that age, gender, education level, income level, marital status, driving experience, accident experience, and attitude toward road safety affect risk behavior perception. In conclusion, the differentiation of vehicles plays a vital role as a critical issue that should be understood for effectively mitigating risks in different travel patterns.
Open Access: Yes
Biostimulant effect of quantitative indicators of winter rape (Brassica napus L.) quantitative indicators
Publication Name: Bio Web of Conferences
Publication Date: 2024-08-23
Volume: 125
Issue: Unknown
Page Range: Unknown
Description:
In recent years, one of the major challenges for plant breeders has been the control of abiotic environmental stresses (drought, UV stress, salt concentration, water pressure). Increasingly variable and unpredictable weather anomalies are a warning of the detrimental effects they have on the growth of our crops and prevent us from reaching the potential of our genetic potential and nutrient supply. To prevent and reduce losses, the potential to protect plant health and increase plant resistance to stress must be anticipated and applied in the future if we are to be successful in agricultural production. One element of this is plant biostimulation. Today, crop producers use biostimulants as a compliance pressure, to obtain more subsidies (Agriecological Programme). Biostimulants applied inappropriately (mixed with herbicides), targeted, and at the right time, can have the opposite effect. This also induce irreversible processes in the crop plant. Although the winter swede rape area has been significantly reduced in our country, there are those who persevere despite the difficulties of growing it. Rapes can be successfully grown today with great care and intensive technology, and the weather conditions of recent years have consistently shown that environmental anomalies have a significant impact on its yield. In rapes, the use of biostimulators and fertilising products is considered common. Our studies with Quantis in rapes have clearly proven its effectiveness. In this article we would like to present the effect of biostiumulant (Quantis) on the production of rapes.
Open Access: Yes
