1841. Numerical solution for fuzzy fractional differential equations by fuzzy multi-step methodsLeila Safikhani, Tofigh Allahviranloo, Leo Mršić, Sovan Samanta, 2025, original scientific article Abstract: To solve fractional differential equations, they are typically converted into their corresponding crisp problems through a process known as the embedding method. This paper introduces a novel direct approach to solving fuzzy differential equations using fuzzy calculations, bypassing the need for this transformation. In this study, we develop the fuzzy Adams–Bashforth (A-B) method and the fuzzy Adams–Moulton (A-M) method to find numerical solutions for fuzzy fractional differential equations (FFDEs) with fuzzy initial values. To demonstrate the accuracy and efficiency of the proposed methods, we determine both the local truncation error and the global truncation error. Additionally, we establish the convergence and stability of these methods in detail. Finally, numerical examples are provided to illustrate the flexibility and effectiveness of the proposed methods.
Keywords: fuzzy fractional differential equation, generalized Hukuhara difference, fuzzy generalized A-B method, local truncation error, global truncation error, fuzzy generalized A-M method, convergence, stability
Published in DiRROS: 19.06.2025; Views: 403; Downloads: 309
 Full text (607,21 KB)
This document has many files! More... |
1842. Influence of Building Envelope Modeling Parameters on Energy Simulation ResultsSimon Muhič, Dimitrije Manić, Ante Čikić, Mirko Komatina, 2025, original scientific article Abstract: This study investigates the influence of input values for building energy model parameters on simulation results, with the aim of improving the reliability and sustainability of energy performance assessments. Dynamic simulations were conducted in TRNSYS for three theoretical multi-residential buildings, varying parameters such as referent model dimensions, infiltration rates, envelope thermophysical properties, and interior thermal capacitance. The case study, based in Slovenia, demonstrates that glazing-related parameters, particularly the solar heat gain coefficient (g-value), exert the most significant influence—reducing the g-value from 0.62 to 0.22 decreased simulated heating (qH,nd) and cooling (qC,nd) demands by 25% and 95%, respectively. In contrast, referent dimensions for modeled floor area proved least influential. For Building III (BSF = 0.36), dimensional variations altered results by less than ±1%, whereas, for Building I (BSF = 0.62), variations reached up to ±20%. In general, lower shape factors yield more robust energy models that are less sensitive to input deviations. These findings are critical for promoting resource-efficient simulation practices and ensuring that energy modeling contributes effectively to sustainable building design. Understanding which inputs warrant detailed attention supports more targeted and meaningful simulation workflows, enabling more accurate and impactful strategies for building energy efficiency and long-term environmental performance.
Keywords: building energy modeling, dynamic simulation, TRNSYS, envelope modeling parameters, building energy performance
Published in DiRROS: 19.06.2025; Views: 482; Downloads: 308
Full text (1,29 MB)
This document has many files! More... |
1843. An Ex Ante approach to the resilience and recovery plan’s impacts on sustainable tourism in Algarve and AlentejoBernardo Valente, Erika Džajić Uršič, 2025, original scientific article Abstract: The European Union has been trying to adjust its tourism policy in response to the challenges posed by the recent COVID-19 pandemic. The funding of the EU Cohesion Policy has been one of the primary mechanisms guaranteeing that all regions can be prepared to receive tourists and cope with the sustainability challenges the pandemic has raised. The recovery and resilience plan (PRR) is the most recent instrument created to help economic growth in most European Union countries. The implementation of the PRR in Algarve and Alentejo has been fundamental to understanding the Portuguese tourism sector, as these regions are heavily dependent on tourism sector revenue and were hit hard by the consecutive lockdowns in recent years. Therefore, this policy, in brief, critically assesses the tourism-related projects that received funding from the PRR until November 2023 (ex ante) and their potential to guarantee long-term tourism sustainability in Algarve and Alentejo. Despite not achieving the expected efficiency results due to delays in project execution and low investment, the PRR is still a positive upgrade for tourism-related policy in Algarve and Alentejo.
Keywords: sustainable tourism, EU cohesion policy, recovery and resilience, Algarve, Alentejo
Published in DiRROS: 19.06.2025; Views: 397; Downloads: 259
Full text (2,62 MB)
This document has many files! More... |
1844. |
1845. Industrial symbiosis networks supporting circularity : understanding complexity, cyclicality and resilienceUrška Fric, Zoran Levnajić, Dolores Modic, Borut Rončević, 2025, original scientific article Abstract: The aim of this study is to provide a more nuanced understanding of the industrial symbiosis networks supporting the circular economy. We do so through an evolutionary dynamics lens, viewing these networks as adaptive complex systems. This approach allows us to address the limited research attention that has resulted in insufficient understanding of the underlying net works in the circular economy literature, particularly regarding collaboration for waste resource exchange. i.e. the circular economy closing of the resource loops. This paper draws on empirically obtained data from industrial symbiosis networks in five countries: Croatia, Slovenia, Austria, Denmark and Finland. Through network analysis, we find that the structure of these symbiosis networks has evolved to varying extents. This evolution takes into account the complexity of leveraging opportunities based on waste resource exchange, cyclicality with numerous feedback loops, and resilience against disruptions and failures. Based on these findings, we propose three types of symbiosis networks that support circularity: mature, evolving, and emerging. Concur rently, we further develop conceptual and empirical diagnostic tools for future research by showcasing the utility of newly developed measures. Additionally, we outline several practical implications for both system-level, and organization-level managers.
Keywords: circular economy, industrial symbiosis networks, typology, complexity, cyclicality, resilience
Published in DiRROS: 19.06.2025; Views: 511; Downloads: 300
Full text (837,78 KB)
This document has many files! More... |
1846. |
1847. |
1848. Development of a gold nanoparticle dispersion for plasma jet printing on solid substratesLan Kresnik, Peter Majerič, Darja Feizpour, Rebeka Rudolf, 2025, original scientific article Abstract: Gold nanoparticles (AuNPs) were synthesised using ultrasonic spray pyrolysis (USP) with the addition of polyvinylpyrrolidone (PVP) as a stabilising agent and subsequently dried via lyophilisation. The resulting dried AuNPs were redispersed in ethanol and homogenised to ensure uniform dispersion. This AuNP dispersion was then deposited onto a ceramic substrate - aluminum oxide (Al2O3) - using plasma jet printing. Comprehensive characterisation of the dispersion, AuNPs, and the resulting printed lines was performed using the following methods: inductively coupled plasma optical emission spectroscopy (ICP-OES), scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected area electron diffraction (SAED), scanning transmission electron microscopy (STEM), energy dispersive X-ray spectroscopy (EDS), ultraviolet-visible spectroscopy (UV–Vis), dynamic light scattering (DLS), measurements of dispersion viscosity and printed line roughness. ICP-OES confirmed consistent gold content in the AuNP dispersion, while the SEM and EDS analyses revealed predominantly spherical AuNPs with minimal aggregation and similar size distributions. TEM, SAED, and STEM/EDS confirmed that the crystalline structure and elemental composition of the AuNPs had diverse morphologies and strong gold signals. The UV–VIS, DLS, and zeta potential measurements indicated moderate colloidal stability, and thermogravimetric analysis (TGA) verified the AuNPs dispersion’s composition. The AuNP dispersion exhibited thixotropic behaviour favourable for printing applications, while confocal microscopy confirmed smooth, uniform printed traces, with an average surface line roughness of 1.65 μm. The successful use of plasma printing with the AuNP dispersion highlights its potential for functional material applications in electronics.
Keywords: gold nanoparticles, ultrasonic spray pyrolysis, dispersion, plasma jet printing
Published in DiRROS: 19.06.2025; Views: 484; Downloads: 300
Full text (5,02 MB)
This document has many files! More... |
1849. Plasma-assisted synthesis in aqueous solution to prepare Ir-based nanocatalysts for oxygen evolution reaction in acidic conditionsAlexey Treshchalov, Heiki Erikson, Milutin Smiljanić, Milena Šetka, Lazar Bijelić, Marjan Bele, Martin Šala, Siim Pikker, Peeter Ritslaid, Nejc Hodnik, Kaido Tammeveski, 2025, original scientific article Published in DiRROS: 19.06.2025; Views: 455; Downloads: 251
Full text (1,72 MB)
This document has many files! More... |
1850. |
