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Publications - 6374

Combination of Sustainable Agriculture and Renewable Energy Systems

Balázs Vehovszky Zoltán Weltsch Bernadett Rádli-Burján Ferenc Magyar Lóránt Kovács

Publication Name: Chemical Engineering Transactions

Publication Date: 2024-01-01

Volume: 114

Issue: Unknown

Page Range: 913-918

Description:

It is now not a question anymore that the fossil fuel-based energy system of human civilization has to be converted into a sustainable energy cycle during the 21st century. In most cases, the introduction of related, novel energetical technologies and solutions leads to disadvantageous interferences with other fields of life. Perhaps the most critical example is the competition between the energy sector and the food industry for valuable agricultural land. Although the two utilization purposes are generally considered mutually exclusive, there are agro-energetical solutions where the two goals are not just indifferent, but they expressly increase each other's efficiency. Such solutions are the agro-photovoltaic systems, where photovoltaic panels are installed in a way that is advantageous for the crops below them. Some plants, such as berries, prefer shady to semi-shady environments, which can be optimally provided under partially covered PV fields. With the active control of the PV panels, ideal shading conditions and even mechanical protection can be ensured in case of extreme weather events. With the appropriate selection of the crop plants and the PV installation, cultivation processes are not hindered, can be highly automated, and the energy needs can be fully covered by the local PV system. From the above description, it is clear that the realization of efficient agro-photovoltaic systems is not just possible but really prosperous. This study offers a more detailed overview of currently realized solutions around the world, as well as a thorough planning process of an agro-photovoltaic project at the ZalaZONE test center, optimized for the Hungarian climatic and agricultural conditions and possibilities.

Open Access: Yes

DOI: 10.3303/CET24114153

Examination of the Effect of Wind on Vehicle Drag Coefficient from Aerodynamics Point of View

I. Lakatos Brúnó Péter Péter Kardos

Publication Name: Periodica Polytechnica Transportation Engineering

Publication Date: 2026-11-28

Volume: 54

Issue: 1

Page Range: 34-40

Description:

The aim of the paper is to investigate the wind effect on vehicle aerodynamic properties. Two-dimensional Ahmed body is examined with Computational Fluid Dynamics (CFD) method. During the analysis, two different studies were carried out. First, the simplified vehicle shape was examined in standing position, only the force from the wind velocity affected the body. The drag coefficient change was examined in case of different wind velocities and angles of attack. After that, the effect of wind while driving was investigated. The body was defined as a moving object and at another inlet the wind was defined. Different travelling and wind velocities with different angles of attack were studied. Based on the results of the simulations, a comprehensive impact of the wind can be measured on the drag coefficient. This proves that the wind has a measurable effect on vehicle aerodynamic properties and must be taken into account when investigating the effect of weather conditions on vehicle aerodynamic properties.

Open Access: Yes

DOI: 10.3311/PPtr.40035

Reduction in Energy Demand and Environmental Impact in Office Buildings by Natural Ventilation: A Case Study †

Gusztáv Fekete Ildikó Molnár Brendon Axel Vagdalt Ákos Jányoki Ferenc Szlivka

Publication Name: Engineering Proceedings

Publication Date: 2025-01-01

Volume: 113

Issue: 1

Page Range: Unknown

Description:

Sustainable building heat recovery ventilation is a key factor in modern structural design and production, which can be achieved by the combination of cutting-edge, energy-economical technologies, such as counter flow flat-plats, heat pipes and simple design arrangements like a light well. To achieve low energy use and good indoor air quality, natural ventilation should be applied as often as possible. In this article, an energy simulation study is presented, which is focused on an in-built natural ventilation system of an existing vacant office building. It has been demonstrated that a substantial amount of energy can be saved by utilizing natural ventilation in a building, while it was also proven that obsolete buildings can be energy-efficiently operated, without the need for demolition, if they are cautiously re-designed.

Open Access: Yes

DOI: 10.3390/engproc2025113043

A Parametric BIM Framework to Conceptual Structural Design for Assessing the Embodied Environmental Impact

János Szép Kitti Karolyfi

Publication Name: Sustainability Switzerland

Publication Date: 2023-08-01

Volume: 15

Issue: 15

Page Range: Unknown

Description:

Decisions made in the early design stage have a significant effect on a building’s performance and environmental impact. In practice, a conceptual design is performed by an architect, while a structural engineer begins to work in later phases when the architectural concept has already evolved. However, the geometry and form of a building directly determine the type of structure and applicable materials; therefore, the conceptual design phase gives rise to examining alternative solutions. This paper presents a method for generating alternative structural solutions in the conceptual design phase and examining their embodied environmental impact by integrating parametric design and building information modeling (BIM). Rhinoceros and Grasshopper were used to develop the parametric script, which includes the generation of geometrical variations, the automatic definition of initial cross sections for the load-bearing elements based on in-built structural design approximations, the datasets for embodied environmental impact of the used building materials, the generation of life cycle inventory (LCI), the automatic calculation of life cycle assessment (LCA) results based on the geometry, and the conversion of the parametric model into building information model. The method was demonstrated using a case study of 48 different alternative solutions for an unheated warehouse made of steel frames. Based on the results, the areas with the greatest energy impact were identified. The case study analysis also illustrated that the applied cross section may have a significant effect on the impact categories. The results draw attention to the complexity of LCA calculations even in the case of a simple structure containing a limited number of variables, where parametric design can serve as an effective tool for a comprehensive environmental impact assessment.

Open Access: Yes

DOI: 10.3390/su151511990

The P-graph approach for systematic synthesis of wastewater treatment networks

Ákos Orosz Kirti M. Yenkie Jean Pimentel Heriberto Cabezas Ferenc Friedler

Publication Name: Aiche Journal

Publication Date: 2021-07-01

Volume: 67

Issue: 7

Page Range: Unknown

Description:

Wastewater treatment consists of three or four sequential stages: preliminary, primary, secondary, and tertiary. Each stage can comprise multiple alternative technologies that can perform the same tasks with different efficiencies, operating times, and costs. Thus, we propose a systematic approach for designing wastewater treatment networks by utilizing principles of mathematical modeling and generating an exhaustive enumeration of all the possible technologies and their connections during the early stages of designing a treatment facility. Some of these structures are nonintuitive and include recycling, reprocessing, bypasses, and multiple technologies in parallel or series to remove the same contaminant. The nonintuitive structures with multiple technologies may provide a measure of resilience compared to typical heuristic designs. Thus, the combination of P-graph methodology and the sequence of treatment technologies predicted via the optimization algorithm from the maximal structure is based on holistic considerations and does not lead to suboptimal solutions.

Open Access: Yes

DOI: 10.1002/aic.17253

Does industrial digital-real integration enhance both environmental pollution and carbon emission?

Xin Zhao Shanshan Li Mengqi Wang Jiaqi Hao Yize Zhang Keji Lu Huanglong Ma

Publication Name: Gondwana Research

Publication Date: 2026-08-01

Volume: 156

Issue: Unknown

Page Range: 264-279

Description:

Clarifying how industrial digital-real integration (IDRI) drives the synergistic control of environmental pollution and carbon emissions (SCPC) is critical for advancing digital ecological civilization and implementing China's “Dual Carbon” goals. Using panel data for 285 Chinese prefecture-level cities from 2014 to 2022, this study employs panel regression models to estimate the impact of IDRI on SCPC. The results show that SCPC improved steadily across the sample period, while IDRI exhibited an “N”-shaped evolution, with substantial regional heterogeneity in both variables. IDRI is found to significantly enhance SCPC, and this effect remains robust after addressing endogeneity and conducting a battery of robustness tests. Mechanism analysis indicates that IDRI promotes SCPC through green technological innovation (GTI) and improved ecological governance capacity (EGC). Further, the vitality of environmental governance (VEG) positively moderates the IDRI–SCPC relationship. This study offers important policy implications for developing countries aiming to build a green and intelligent digital ecological civilization.

Open Access: Yes

DOI: 10.1016/j.gr.2026.03.007

Evaluation of physicochemical, microbiological and sensory properties of croissants fortified with arthrospira platensis (Spirulina)

Ramona Massoud Fereshteh Nakhsaz Kianoush Khosravi-Darani László Varga

Publication Name: Czech Journal of Food Sciences

Publication Date: 2016-01-01

Volume: 34

Issue: 4

Page Range: 350-355

Description:

The major physical, chemical, microbiological, and sensory properties of croissants enriched with Spirulina at concentrations ranging between 0.5 and 1.5% were evaluated. The results showed that the use of A. platensis biomass for the production of croissants improved the textural and organoleptic properties of the final products. Spirulina fortification also increased the protein and moisture levels and water-holding capacity, whereas it decreased the crumb firmness and lightness of croissants. Optimum sensory results were obtained when Spirulina was applied at a rate of 1%. Besides these benefits, the A. platensis biomass enhanced the levels of biologically active substances (i.e. essential amino acids, chlorophyll, phycocyanin, carotenoids, minerals, vitamins, and essential fatty acids) in croissant samples. To our knowledge, this is the first scientific study on Spirulina-fortified croissants.

Open Access: Yes

DOI: 10.17221/289/2015-CJFS

Game-based logistics tuition efforts in higher education

Lorenzo Ros-McDonnell Csilla Fejes Péter Bajor

Publication Name: Proceedings of the European Conference on Games Based Learning

Publication Date: 2014-01-01

Volume: 2

Issue: Unknown

Page Range: 496-502

Description:

Logistics is one of the most powerful sources in business today. It is the key to open markets, to satisfy customers, to create sustainable supply chains and smart cities. As logistics are getting more and more into most companies'spotlight, there is a constantly growing need for qualified and well-trained experts. While logistics as a discipline went through a complete metamorphosis during the past few decades, related secondary school and university curriculums have mostly remained unchanged, and universities are seldom able to fulfill the needs of the rapidly changing market. The purpose of this study is to show how our game- and simulation-based environment may support the development of logistics tuition by concentrating on all three learning domains of Bloom's taxonomy, by providing hands on experiences and by being deeply rooted in everyone's natural learning process.

Open Access: Yes

DOI: DOI not available

Hospital integration to improve the chances of recovery for decubitus (pressure ulcer) patients through centralised procurement procedures

Lóránt Dávid Mihály Hegedűs Etelka Szivós Ioannis Adamopoulus

Publication Name: Journal of Infrastructure Policy and Development

Publication Date: 2024-01-01

Volume: 8

Issue: 10

Page Range: Unknown

Description:

Introduction: In Central Europe, in Hungary, the state guarantees access to health care and basic health services partly through the Semmelweis Plan adopted in 2011. The primary objectives of the Semmelweis Plan include the optimisation and transformation of the health care system, starting with the integration of hospitals and the state control of previously municipally owned hospitals. The transformation of the health care system can have an impact on health services and thus on meeting the needs of the population. In addition to reducing health inequalities and costs, the relevant benefits include improving patients’ chances of recovery and increasing patient safety. The speciality under study is decubitus care. Our hypothesis is that integration will improve the chances of recovery for decubitus patients through access to smart dressings to promote patient safety. Objective: to investigate and demonstrate the effectiveness of integration in improving the chances of recovery for decubitus ulcer patients. Material and methods: The research compared two time periods in the municipality of Kalocsa, Bács-Kiskun County, Southern Hungary. We collected the number of decubitus patients arriving and leaving the hospital from the nursing records and compared the pre-integration period when decubitus patients were provided with conventional dressings (01.01.2006–2012.12.31) and the post-integration period, which entailed the introduction of smart dressings in decubitus care (01.01.2013–2012.12.31). The target population of the study was men and women aged 0–99 years who had developed some degree of decubitus. The sample size of the study was 4456. Independent samples t-test, Chow test and linear trend statistics were used to evaluate the results. Based on the empirical evidence, a SWOT analysis was conducted to further examine the effectiveness of integration. Results: The independent samples t-test model used was significant (for Phase I: t (166) = −16.872, p < 0.001; for Phase II: t (166) = −19.928, p < 0.001; for Phase III: t (166) = −19.928, p < 0.001; for Phase III: t (166) = −16.872, p < 0.001). For stage III: t (166) = −10.078, p < 0.001; for stage IV: t (166) = −10.078, p < 0.001; for stage III: t (166) = −10.078, p < 0.001). for stage III: t (166) = −14.066, p < 0.001). For the Chow test, the p-values were highly significant, indicating a structural break. Although the explanatory power of the regression models was variable (R-squared values ranged from 0.007 to 0.617), they generally supported the change in patient dynamics after integration. Both statistical analyses and SWOT analysis supported our hypothesis and showed that integration through access to smart dressings improves patients’ chances of recovery. Conclusions: Although only one segment of the evidence on the effectiveness of hospital integration was examined in this study, integration in the study area had a positive impact on the effective care of patients with decubitus ulcers, reduced inequalities in care and supported patient safety. In the context of the results obtained, these trends may reflect different systemic changes in patient management strategies in addition to efficient allocation of resources and quality of care.

Open Access: Yes

DOI: 10.24294/jipd.v8i10.7273