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Publications - 6273
Global Sensitivity Study of a Duffing-Type Nonlinear Vibration System
Publication Name: Strojnicky Casopis
Publication Date: 2024-11-01
Volume: 74
Issue: 2
Page Range: 17-24
Description:
An interesting field of studying nonlinear systems is their sensitivity study. With sensitivity study the most influential parameters on a system can be obtained and then the simplification and improvement of the model will be possible. In this paper the global sensitivity study of a Duffing-type vibration system is carried out with Sobol's variance-based method taking the root mean square of acceleration and the maximum acceleration as output variables. With the sensitivity study it was observed that the parameters of the excitation signal like the amplitude and the angular velocity are the most influential. It was also found that a single parameter has less influence on the system than the parameter combinations. The aim of the research is to carry out the global sensitivity study of a relatively simple nonlinear system. The study is the basis for further research tasks in order to perform the sensitivity study of more complex systems.
Open Access: Yes
Mechanism of environmental regulation on energy productivity, energy structure, and carbon emissions: The role of directed technological progress
Publication Name: Energy
Publication Date: 2025-08-01
Volume: 328
Issue: Unknown
Page Range: Unknown
Description:
The mechanism of environmental regulation on energy conservation and carbon reduction in the petrochemical industry through directed technological progress remains uncertain due to the directional characteristics of technology. This paper develops a mechanism framework and employs a panel two-way fixed-effects model to clarify the impact of environmental regulation on directed technological progress and energy conservation, while uncovering its underlying mechanisms. Subsequently, a dynamic Kaya model is constructed, using the Monte Carlo method to determine the required intensity of environmental regulation for China's petrochemical industry to actualize the SSP1-CHN, SSP1, and SSP2 scenarios. The model also simulates the future bias of technological progress, energy utilization, and potential carbon emissions under each scenario. The findings indicate that increasing the intensity of environmental regulation drives technological progress toward energy conservation, thereby enhancing energy-saving biased technological progress, improving energy productivity, and optimizing the energy structure. Furthermore, to actualize the carbon peak by 2030 and carbon neutrality by 2060 under the SSP1-CHN scenario, the annual growth rate of environmental regulation intensity in China's petrochemical industry should be no less than 8 % before 2030 and should be strengthened to 20 % after 2030.This study not only extends the application of directed technological progress theory in the energy field but also provides innovative and practical environmental policy recommendations for the low-carbon development of the global petrochemical industry.
Open Access: Yes
Comparative Analysis of Foundation Systems in Expansive Soil: A Three-Dimensional Model Approach to Moisture Diffusion and Volume Changes
Publication Name: Geotechnical and Geological Engineering
Publication Date: 2024-11-01
Volume: 42
Issue: 8
Page Range: 7935-7961
Description:
This study compares the performance of various foundation systems in expansive soils, such as mats, granular anchor piles, and concrete piles. Expansive soils experience volumetric changes due to moisture fluctuations, which can lead to structural damage. Abaqus software, in conjunction with the SCV approach, is used to analyze soil-foundation interactions. A custom subroutine enhances simulation accuracy by incorporating empirical data on unsaturated clay behavior, matric suction, and variations in effective stress. The method’s accuracy is validated by comparing simulation results to field and laboratory experiments. The findings indicate that increasing the applied load on mats decreases overall heave but increases the differential heave. Additionally, higher soil permeability dereases the differential heave of mats. Granular anchor piles outperform concrete piles by more than 50% in highly expansive soils, suggesting a preference for these foundations. This study provides insights into the behavior of expansive soils, which will assist engineers in designing resilient foundation systems for structures.
Open Access: Yes
Enabling Energy-Efficient and Sustainable Green Glycerol-Derived 1,3-Propanediol Production via a Graph-Theoretical-Based Approach
Publication Name: ACS Sustainable Chemistry and Engineering
Publication Date: 2025-07-28
Volume: 13
Issue: 29
Page Range: 11178-11189
Description:
The rise in biodiesel production results in an excess of crude glycerol, which further leads to environmental concerns. Consequently, transforming crude glycerol into valuable products is deemed an effective way to address this issue. Process Integration techniques are introduced to enhance the overall economic viability by maximizing the energy recovery in the biodiesel plant. However, most of the existing studies merely focused on a single optimal heat exchanger network (HEN) generated. In this study, P-HENS software is utilized to generate viable HENs for a glycerol-derived 1,3-propanediol plant. Subsequently, piping costs of each HEN are estimated to determine the optimal HEN by assuming the respective heat exchanger is placed at the centroid. Finally, the optimal HEN is identified based on the total annualized costs (TAC) (which include the capital cost of the heat exchanger, utility cost, and piping costs) and energy-related carbon emissions of the network. The results show that, among the 4,188 feasible networks generated, network #623 possesses the best overall performance when both cost and environmental aspects are considered. The carbon emissions of network #623 is 16.7% lower than that of the case without heat recovery. This work demonstrates the usefulness of the generated near-best HENs in enabling a more comprehensive HEN optimization. By application of the proposed methodology, the most economical and environmentally friendly HEN can be determined. This contributes to both cost savings and sustainability in HEN design.
Open Access: Yes
Unveiling the Role of Edaphic Microalgae in Soil Carbon Sequestration: Potential for Agricultural Inoculants in Climate Change Mitigation
Publication Name: Agriculture Switzerland
Publication Date: 2024-11-01
Volume: 14
Issue: 11
Page Range: Unknown
Description:
Agricultural soil has great potential to address climate change issues, particularly the rise in atmospheric CO2 levels. It offers effective remedies, such as increasing soil carbon content while lowering atmospheric carbon levels. The growing interest in inoculating soil with live microorganisms aims to enhance agricultural land carbon storage and sequestration capacity, modify degraded soil ecosystems, and sustain yields with fewer synthetic inputs. Agriculture has the potential to use soil microalgae as inoculants. However, the significance of these microorganisms in soil carbon sequestration and soil carbon stabilization under field conditions has yet to be fully understood. Large-scale commercial agriculture has focused on the development and use of inoculation products that promote plant growth, with a particular emphasis on enhancing yield attributes. Gaining more profound insights into soil microalgae’s role in soil carbon cycling is necessary to develop products that effectively support soil carbon sequestration and retention. This review comprehensively explores the direct and indirect mechanisms through which soil microalgae contribute to soil carbon sequestration, highlighting their potential as microbial inoculants in agricultural settings. This study underlines the need for more research to be conducted on microalgae inoculation into agricultural soil systems aimed at mitigating carbon emissions in the near future.
Open Access: Yes
From ESG to holistic value addition: Rethinking sustainable investment from the lens of stakeholder theory
Publication Name: International Review of Economics and Finance
Publication Date: 2024-11-01
Volume: 96
Issue: Unknown
Page Range: Unknown
Description:
Stakeholder theory calls for effective stakeholder management in the interest of sustainable businesses. Whilst there is a need to redefine ‘stakeholders’, investors (i.e. shareholders) can play an essential role in bringing a paradigm shift in shaping current business practices. In recent times, the ‘Environment, Society and Governance’ (ESG) approach has emerged as an alternative form of investment for key investors seeking change. However, certain deficiencies have been identified when it comes to ESG strategies, which have led to disagreements among sustainable investors. To plug this gap and overcome this challenge, we propose an alternative framework based on sustainable business practices that holistically adds value that is inclusive of all stakeholders. To this end, we conducted semi-structured interviews with social entrepreneurs, academics, and experts from the financial services industry in an emerging country context, namely India. Based on our text analysis of interview data, we propose a ‘Holistic Value Addition’ (HVA) framework of sustainable investment that builds on value-addition by businesses towards its stakeholders. We envisage that adoption of this framework will help sustain the sustainable agenda.
Open Access: Yes
Health status of Hungarian ambulance workers in the COVID-19 era
Publication Name: Orvosi Hetilap
Publication Date: 2024-10-27
Volume: 165
Issue: 43
Page Range: 1707-1713
Description:
Objective: The study aimed to assess the physical and mental health status of active ambulance workers concerning the additional workload they are facing due to the coronavirus pandemic. Data and methods: A cross-sectional survey was conducted with 130 Hungarian National Ambulance Service em¬ployees (n = 130) in the first quarter of 2023, using an online questionnaire on a voluntary, anonymous basis. After convenience sampling, physical and mental health were assessed using the SF-36 questionnaire, along with questions on musculoskeletal status and experience of the COVID-19 pandemic. SPSS was used for data analysis, with descrip¬tive and mathematical statistical tests. The results were significant at p<0.05. Results: The ambulance workers considered their "Physical functioning"to be the best (mean 90.7 ± 13.2 points) and their "General health"to be the worst (55.4 ± 9.5 points). The dimensions were correlated (p<0.001). 73.1% of the sample had a musculoskeletal complaint in the last 5 years, with the highest proportions in the back area (56.8%) and spine (51.5%). These ambulance workers rated their "Physical Functioning"significantly worse (p = 0.002). 95 persons were registered as COVID-19-infected, 50% of whom were only slightly or not at all affected by the pandemic (mean 2.6 ± 1.2). The experience of the coronavirus had a negative impact on the dimensions "Vitality"(r = -0.204, p = 0.020), "Emotional role"(r = -0.317, p<0.001) and "Mental health"(r = -0.283, p = 0.001). Persons with residual symptoms of COVID-19 rated their "Physical functioning"(p = 0.015), "Physical pain"(p = 0.010), "Social functioning"(p = 0.001), and "Mental health"(p = 0.023) dimensions worse. Conclusion: The sudden increase in workload caused by the pandemic makes it essential to monitor ambulance work¬ers' health closely. Residual symptoms of the coronavirus and concomitant musculoskeletal disorders can compro¬mise the quality of patient care.
Open Access: Yes
Nexus between environmental degradation and climate change during the times of global conflict: Evidence from CS-ARDL model
Publication Name: Environmental and Sustainability Indicators
Publication Date: 2024-06-01
Volume: 22
Issue: Unknown
Page Range: Unknown
Description:
There has been a substantial amount of research done on air pollution, both in terms of its history and its state at the present time. On the other hand, the ever–changing influence of climatic variables such as sun hour, air pressure, and wind speed has gotten just a small portion of the attention. This divide becomes even more apparent when one considers the ongoing conflicts that are taking place between Russia and Ukraine as well as the current state of the environment's response to climate change. In order to bridge this research gap, the goal of this study is to explore the ways in which climatological factors impact air quality, especially levels of PM2.5 and ozone, in a range of cities situated in India, during 2020–2021. Studies conducted over brief and extended periods of time have made it abundantly evident that sun hour, wind speed, and humidity have an impact on ozone levels. The study also sheds light on prospective policies that may be implemented in the future, such as those relating to carbon emission and particulate pollution such as PM2.5, in order to successfully battle the negative impacts that these variables have on the environment.
Open Access: Yes
Identification crisis: a fauna-wide estimate of biodiversity expertise shows massive decline in a Central European country
Sándor Koczor
Péter Kovács
Tibor Kovács
Márk Lukátsi
Gábor Majoros
Vivien Zsupos
Zoltán Csabai
Arnold Móra
Barna Páll-Gergely
Gellért Puskás
Lajos Rózsa
Zoltán Soltész
Frank Thorsten Krell
Levente Ábrahám
Bálint Bajomi
Pál Boda
Bálint Pernecker
Luca Eszter Balog
Csaba Csuzdi
Éva Szita
Tamás Szűts
Balázs Tóth
Andrea Tőke
Katalin Zsuga
Adrienn Horváth
Péter Kóbor
Dávid Murányi
Zoltán Vas
Tamás Németh
László Dányi
Zoltán Fehér
Sándor Hornok
Jenő Kontschán
Publication Name: Biodiversity and Conservation
Publication Date: 2024-11-01
Volume: 33
Issue: 13
Page Range: 3871-3903
Description:
Expertise in biodiversity research (taxonomy, faunistics, conservation with taxonomic background) appears to decline worldwide. While the “taxonomic impediment” is discussed extensively in the literature, much fewer papers focus on the identification crisis, i.e., the decreasing number of experts who can identify species, and the decline of species-based biodiversity research. As a test case to explore the gravity of the identification crisis, we chose Hungary, a Central European country with a strong history of comprehensive taxonomic expertise and research output. We set out to answer two main questions. (1) What proportion of the Hungarian fauna could currently be identified by Hungarian experts, and what factors determine which groups are covered; and (2) what are the trends of biodiversity research in Hungary, and what are the underlying reasons for these trends? We show that Hungary lacks active biodiversity experts for almost half of the nearly 36,000 animal species recorded in the country, and more than a quarter of the fauna have only one or two active experts available. We also show that faunistic research experienced a golden era between ca. 1990 and 2010. Since then, however, there has been a strong decline, with the number of active experts and published papers decreased to a level like that of the 1970s. Multiple factors are identified causing this trend, such as increased pressure to publish in high impact journals and increasing administrative duties of professional scientists. The next generation of biodiversity experts needs to be fluent in modern techniques and publication strategies but also maintain robust morphology-based knowledge to be equipped for identification tasks of difficult taxa. Despite being disadvantaged by exclusive application of citation-based evaluation, we do need more positions and focused grants for biodiversity researchers to maintain the country’s knowledge base and to avoid being increasingly dependent on—equally declining—foreign expertise.
Open Access: Yes
