@misc{MTMT:36074073,
	title = {GENERIC-motivated extended symplectic numerical methods for dissipative mechanical systems: A concrete example and general messages},
	url = {https://m2.mtmt.hu/api/publication/36074073},
	author = {Fülöp, Tamás and Szücs, Mátyás and Takács, Donát M.},
	unique-id = {36074073},
	year = {2025},
	orcid-numbers = {Fülöp, Tamás/0000-0003-2708-7065; Szücs, Mátyás/0000-0002-2492-0392; Takács, Donát M./0000-0002-8463-745X}
}

@article{MTMT:35419433,
	title = {Thermodynamics and dynamic stability: extended theories of heat conduction},
	url = {https://m2.mtmt.hu/api/publication/35419433},
	author = {Somogyfoki, Réka and Famá, Alessio and Restuccia, Liliana and Ván, Péter},
	doi = {10.1515/jnet-2024-0041},
	journal-iso = {J NON-EQUIL THERMODY},
	journal = {JOURNAL OF NON-EQUILIBRIUM THERMODYNAMICS},
	volume = {50},
	unique-id = {35419433},
	issn = {0340-0204},
	abstract = {The stability of homogeneous thermodynamic equilibrium is analyzed in heat conduction theories in the framework of nonequilibrium thermodynamics, where the internal energy, the heat flux and a second order tensor are thermodynamic state variables. It is shown, that the thermodynamic conditions of concave entropy and nonnegative entropy production can ensure the linear stability. Various special heat conduction theories, including Extended Thermodynamics, are compared in the general framework.},
	year = {2025},
	eissn = {1437-4358},
	pages = {59-76},
	orcid-numbers = {Ván, Péter/0000-0002-9396-4073}
}

@article{MTMT:34726196,
	title = {Improving the accuracy of the Newmark method through backward error analysis},
	url = {https://m2.mtmt.hu/api/publication/34726196},
	author = {Takács, Donát M. and Fülöp, Tamás},
	doi = {10.1007/s00466-024-02580-3},
	journal-iso = {COMPUT MECH},
	journal = {COMPUTATIONAL MECHANICS},
	volume = {75},
	unique-id = {34726196},
	issn = {0178-7675},
	abstract = {We use backward error analysis for differential equations to obtain modified or distorted equations describing the behaviour of the Newmark scheme applied to the transient structural dynamics equation. Based on the newly derived distorted equations, we give expressions for the numerically or algorithmically distorted stiffness and damping matrices of a system simulated using the Newmark scheme. Using these results, we show how to construct compensation terms from the original parameters of the system, which improve the performance of Newmark simulations. The required compensation terms turn out to be slight modifications to the original system parameters (e.g. the damping or stiffness matrices), and can be applied without changing the time step or modifying the scheme itself. Two such compensations are given: one eliminates numerical damping, while the other achieves fourth-order accurate calculations using the traditionally second-order Newmark method. The performance of both compensation methods is evaluated numerically to demonstrate their validity, and they are compared to the uncompensated Newmark method, the generalized-α method and the 4th-order Runge–Kutta scheme. © The Author(s) 2024.},
	year = {2025},
	eissn = {1432-0924},
	pages = {1585-1606},
	orcid-numbers = {Takács, Donát M./0000-0002-8463-745X; Fülöp, Tamás/0000-0003-2708-7065}
}

@article{MTMT:35683742,
	title = {Biró Tamás Sándor: Gintropy (A fiction on inequality)},
	url = {https://m2.mtmt.hu/api/publication/35683742},
	author = {Ván, Péter},
	journal-iso = {FIZIKAI SZEMLE},
	journal = {FIZIKAI SZEMLE},
	volume = {75},
	unique-id = {35683742},
	issn = {0015-3257},
	year = {2025},
	eissn = {1588-0540},
	pages = {36-36},
	orcid-numbers = {Ván, Péter/0000-0002-9396-4073}
}

@article{MTMT:34746761,
	title = {Sustainable printed circuit board substrates based on flame-retarded PLA/flax composites to reduce environmental load of electronics: Quality, reliability, degradation and application tests},
	url = {https://m2.mtmt.hu/api/publication/34746761},
	author = {Farkas, Csaba and Gál, László and Csiszár, András and Grennerat, Vincent and Jeannin, Pierre-Olivier and Xavier, Pascal and Rigler, Dániel and Krammer, Olivér and Plachy, Zbynek and Dusek, Karel and Kovács, Róbert Sándor and Fehér, Anna Éva and Géczy, Attila},
	doi = {10.1016/j.susmat.2024.e00902},
	journal-iso = {SUSTAINABLE MATERIALS TECHNOLOGIES},
	journal = {SUSTAINABLE MATERIALS AND TECHNOLOGIES},
	volume = {40},
	unique-id = {34746761},
	issn = {2214-9929},
	abstract = {The present paper introduces a novel, sustainable approach to produce an eco-friendly Printed Circuit Board (PCB) substrate; a substitute for traditional substrates, to significantly reduce e-waste. We present the prepreg technology, the road to actual circuit assembly with application studies, life cycle analysis (LCA), and sustainability analysis. The flame-retarded prepregs and resulting PCB assemblies were based on polylactic acid (PLA), the structure is reinforced with flax textiles. After copper lamination, subtractive PCB production was performed, and thermal and mechanical reliability was investigated in the case of both laminated and bare substrates. Steps of surface roughness, peel and thermal analysis followed. After a new set of assemblies, the post-assembly analysis was extended with further shear strength analysis on the soldered components and mass analysis regarding thermal processes. The evaluation showed that PLA/Flax substrates provide reliable structural performance up to 200 °C in the reflow soldering process; this allows limited but stabilized application possibilities with specific eco-friendly lead-free solders. A basic blinker circuit and a field programmable gate array (FPGA)–based design was produced and tested; the latter has the general complexity of a commercial circuit. A vol% and wt% analysis extended our discussion with a reduction of harmful components in waste in the range of 90%, which is a disruptive and significant result. Life cycle analysis (LCA) quantified the ecological impact of the assembly, highlighting a significant ease on environmental load (∼10%) for the total assembly. Finally, a qualitative degradation study was introduced to the prepared samples to investigate short-term stability with mechanical-, colour-, mass- and scanning electron microscopy (structure) analysis. Early results show that the boards can withstand the harsh environment of a composting bin for a few days, but in the time of a few weeks, degradation starts, pointing to eventual decomposition. The work directly connects with multiple sustainability development goals. © 2024 The Authors},
	keywords = {life cycle; scanning electron microscopy; recycling; Substrates; Surface roughness; Thermoanalysis; environmental protection; Electric network analysis; Sustainable development; Soldering; Electronic equipment; Field programmable gate arrays (FPGA); Waste reduction; Lead-free solders; Environmental loads; Electronic waste; PCB; Printed circuit boards; Eco-friendly; Timing circuits; E-wastes; sustainable electronics; Flame-retarded; Biodegradable PCB; Environmentally-friendly electronics; Biodegradable printed circuit board; E-waste reduction; E-waste reduction; Environmentally-friendly electronic; Printed circuit board substrate; Printed circuit board substrate},
	year = {2024},
	eissn = {2214-9937},
	orcid-numbers = {Kovács, Róbert Sándor/0000-0001-5822-6035; Fehér, Anna Éva/0000-0002-2366-6388}
}

@article{MTMT:34755651,
	title = {Thermal and mechanical properties of AlSi7Mg matrix syntactic foams reinforced by Al2O3 or SiC particles in matrix},
	url = {https://m2.mtmt.hu/api/publication/34755651},
	author = {Fehér, Anna Éva and Maróti, János Endre and Takács, Donát M. and Orbulov, Imre Norbert and Kovács, Róbert Sándor},
	doi = {10.1016/j.ijheatmasstransfer.2024.125446},
	journal-iso = {INT J HEAT MASS TRANS},
	journal = {INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER},
	volume = {226},
	unique-id = {34755651},
	issn = {0017-9310},
	year = {2024},
	eissn = {1879-2189},
	orcid-numbers = {Fehér, Anna Éva/0000-0002-2366-6388; Takács, Donát M./0000-0002-8463-745X; Orbulov, Imre Norbert/0000-0002-5358-0630; Kovács, Róbert Sándor/0000-0001-5822-6035}
}

@article{MTMT:34691294,
	title = {Challenges in the thermal modeling of highly porous carbon foams},
	url = {https://m2.mtmt.hu/api/publication/34691294},
	author = {Fehér, Anna Éva and Kovács, Róbert Sándor and Sudár, Ákos and Barnaföldi, Gergely Gábor},
	doi = {10.1007/s10973-024-12927-w},
	journal-iso = {J THERM ANAL CALORIM},
	journal = {JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY},
	volume = {149},
	unique-id = {34691294},
	issn = {1388-6150},
	abstract = {The heat pulse (flash) experiment is a well-known, widely used method to determine thermal diffusivity. However, for heterogeneous, highly porous materials, neither the measurement nor the evaluation methodologies are straightforward. In the present paper, we focus on two open-cell carbon foam types, differing in their porosity but having the same sample size. Recent experiments showed that a non-Fourier behavior, called ’over-diffusive’ propagation, can be present for such a complex structure. The (continuum) Guyer–Krumhansl equation stands as a promising candidate to model such transient thermal behavior. In order to obtain a reliable evaluation and thus reliable thermal parameters, we utilize a novel, state-of-the-art evaluation procedure developed recently using an analytical solution of the Guyer–Krumhansl equation. Based on our observations, it turned out that the presence of high porosity alone is necessary but not satisfactory for non-Fourier behavior. Additionally, the mentioned non-Fourier effects are porosity-dependent; however, porous samples can also follow the Fourier law on a particular time scale. These data serve as a basis to properly identify the characteristic heat transfer mechanisms and their corresponding time scales, which altogether result in the present non-Fourier behavior. Based on these, we determined the validity region of Fourier’s law in respect of time scales.},
	year = {2024},
	eissn = {1572-8943},
	pages = {3605-3616},
	orcid-numbers = {Fehér, Anna Éva/0000-0002-2366-6388; Kovács, Róbert Sándor/0000-0001-5822-6035}
}

@article{MTMT:35659955,
	title = {Szintaktikus fémhabok termikus és mechanikai tulajdonságai, valamint alkalmazhatóságuk fázisváltó hőtároló rendszerekben},
	url = {https://m2.mtmt.hu/api/publication/35659955},
	author = {Fehér, Anna Éva and Kovács, Róbert Sándor and Kun-Balog, Attila and Maróti, János Endre and Orbulov, Imre Norbert and Sztankó, Krisztián Endre and Szücs, Mátyás and Balog, Róbert and Takács, Donát M.},
	journal-iso = {ENGA},
	journal = {ENERGIAGAZDÁLKODÁS},
	volume = {65},
	unique-id = {35659955},
	issn = {0021-0757},
	year = {2024},
	pages = {6-11},
	orcid-numbers = {Fehér, Anna Éva/0000-0002-2366-6388; Kovács, Róbert Sándor/0000-0001-5822-6035; Orbulov, Imre Norbert/0000-0002-5358-0630; Szücs, Mátyás/0000-0002-2492-0392; Takács, Donát M./0000-0002-8463-745X}
}

@article{MTMT:35472736,
	title = {Szintaktikus fémhabok termikus és mechanikai tulajdonságai, valamint alkalmazhatóságuk fázisváltó hőtároló rendszerekben},
	url = {https://m2.mtmt.hu/api/publication/35472736},
	author = {Fehér, Anna Éva and Kovács, Róbert Sándor and Kun-Balog, Attila and Maróti, János Endre and Orbulov, Imre Norbert and Sztankó, Krisztián Endre and Szücs, Mátyás and Balog, Róbert and Takács, Donát M.},
	journal-iso = {ENGA},
	journal = {ENERGIAGAZDÁLKODÁS},
	volume = {65},
	unique-id = {35472736},
	issn = {0021-0757},
	year = {2024},
	pages = {34-39},
	orcid-numbers = {Fehér, Anna Éva/0000-0002-2366-6388; Kovács, Róbert Sándor/0000-0001-5822-6035; Orbulov, Imre Norbert/0000-0002-5358-0630; Szücs, Mátyás/0000-0002-2492-0392; Takács, Donát M./0000-0002-8463-745X}
}

@article{MTMT:35149914,
	title = {A hővezetés törvényének újragondolása - Mérnöki kihívások a mindennapokban},
	url = {https://m2.mtmt.hu/api/publication/35149914},
	author = {Fehér, Anna Éva},
	journal-iso = {ÉLET ÉS TUDOMÁNY},
	journal = {ÉLET ÉS TUDOMÁNY},
	volume = {LXXIX},
	unique-id = {35149914},
	issn = {0013-6077},
	year = {2024},
	eissn = {1418-1665},
	pages = {915-917},
	orcid-numbers = {Fehér, Anna Éva/0000-0002-2366-6388}
}

@article{MTMT:34733253,
	title = {On the dynamic thermal conductivity and diffusivity observed in heat pulse experiments},
	url = {https://m2.mtmt.hu/api/publication/34733253},
	author = {Fehér, Anna Éva and Kovács, Róbert Sándor},
	doi = {10.1515/jnet-2023-0119},
	journal-iso = {J NON-EQUIL THERMODY},
	journal = {JOURNAL OF NON-EQUILIBRIUM THERMODYNAMICS},
	volume = {49},
	unique-id = {34733253},
	issn = {0340-0204},
	abstract = {Determining the thermal properties of materials with complex structures is still a major engineering challenge today. The well-known heat pulse experiment can be used to determine the thermal diffusivity by measuring the temperature history as a thermal response for a fast excitation. However, the evaluation of the measurements can be challenging, especially when dealing with non-homogeneous samples. The thermal behavior of such heterogeneous materials may exhibit a response including two-time scales. Therefore, the Fourier equation is not necessarily applicable. The simplest possible alternatives are the 2-temperature models the Guyer–Krumhansl and Jeffreys heat equations. In the present paper, we focus on the interpretation of the Jeffreys heat equation; studying its analytical solution, we present a fitting method for determining the unknown parameters. We also discuss its relation with the other two heat equations, and we offer an interpretation of how to characterize the transient response of heterogeneous materials.},
	year = {2024},
	eissn = {1437-4358},
	pages = {161-170},
	orcid-numbers = {Fehér, Anna Éva/0000-0002-2366-6388; Kovács, Róbert Sándor/0000-0001-5822-6035}
}

@article{MTMT:34772009,
	title = {Thermal diffusity in copper benzene-1,3,5-tricarboxylate–reduced graphite oxide mechanical composites},
	url = {https://m2.mtmt.hu/api/publication/34772009},
	author = {Gál, Márton and Samaniego Andrade, Samantha Kathiuska and Fehér, Anna Éva and Farkas, Attila and Madarász, János and Horváth, Lili and Gordon, Péter and Kovács, Róbert Sándor and Nagyné László, Krisztina},
	doi = {10.1007/s10973-024-13021-x},
	journal-iso = {J THERM ANAL CALORIM},
	journal = {JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY},
	volume = {149},
	unique-id = {34772009},
	issn = {1388-6150},
	abstract = {Metal organic frameworks (MOFs) and particularly copper benzene-1,3,5-tricarboxylate (HKUST-1) are excellent materials for gas storage (e.g., CH 4 , N 2 , H 2 adsorption) and gas separation. In this work, reduced graphene oxide (RGO)–HKUST-1 mechanical mixtures were studied in order to reveal the effect of RGO content on the pressure tolerance of the texture and heat conductivity. HKUST-1 was obtained by two different synthesis routes. Air-dried MOF and RGO were thoroughly mixed prior to the compression. Powder XRD and Raman spectroscopy were used to characterize the response of the crystal structure, while low-temperature nitrogen adsorption was used the follow the adsorption properties of the pellets. Finally, the "flash" heat pulse method was used to assess the thermal properties. The gas adsorption isotherms revealed that the adsorption capacity decreases when RGO is added. Based on Raman and XRD results, we found that the synthesis route has an effect on multiple scales. We experimentally confirmed that evaluation of the thermal diffusivity requires a model more complex than the simple Fourier equation, due to the inherent heterogeneous structure of the material. A good approximation of the Fourier coefficient of thermal diffusivity was obtained using the parameters of the Guyer–Krumhansl equation. The heat pulse experiments also revealed possible size-dependent behavior.},
	year = {2024},
	eissn = {1572-8943},
	pages = {5971-5983},
	orcid-numbers = {Fehér, Anna Éva/0000-0002-2366-6388; Farkas, Attila/0000-0002-8877-2587; Kovács, Róbert Sándor/0000-0001-5822-6035; Nagyné László, Krisztina/0000-0003-4499-3983}
}

@article{MTMT:34893181,
	title = {Fluid statics of a self-gravitating isothermal sphere of van der Waals' gas},
	url = {https://m2.mtmt.hu/api/publication/34893181},
	author = {Giordano, Domenico and Amodio, Pierluigi and Iavernaro, Felice and Mazzia, Francesca and Ván, Péter and Szücs, Mátyás},
	doi = {10.1063/5.0206334},
	journal-iso = {PHYS FLUIDS},
	journal = {PHYSICS OF FLUIDS},
	volume = {36},
	unique-id = {34893181},
	issn = {1070-6631},
	abstract = {We subject to scrutiny the physical consistency of adopting the perfect-gas thermodynamic model within self-gravitation circumstances by studying the fluid statics of a self-gravitating isothermal sphere with the van der Waals' thermodynamic model, whose equation of state features well-known terms that account for molecular attraction and size. The governing equations are formulated for any thermodynamic model with two intensive degrees of freedom, applied with the van der Waals' model and solved numerically in nondimensional form by finite-difference algorithms. After a brief summary of thermodynamic characteristics possessed by the van der Waals' model, and relevant to the present study, we proceed to the description of the results in terms of comparative graphs illustrating radial profiles of density, pressure, and gravitational field. We complement them with graphs that compare the dependence of central and wall densities on gravitational number for both perfect-gas and van der Waals' models and that attest dramatically and unequivocally how the presence of molecular-attraction and -size terms removes questionable fluid-statics results systematically found accompanying the perfect-gas model in standard treatments. We also describe, within a very brief and preliminary digression, how the sanitizing action of the mentioned terms affects the thermodynamics of the isothermal sphere by providing evidence of how the gravitational correction to entropy corresponding to the van der Waals' model makes sure that there is no risk of gravothermal catastrophes, negative specific heats, and thermal instabilities. Furthermore, we investigate the phenomenology related to self-gravitationally induced both liquid-gas phase equilibria and metastable-gas states and we describe how they arise naturally and self-consistently from the governing equations. We conclude with a summary of the main results and with a challenging proposal of future work meant to attempt a revalorization the perfect-gas model. © 2024 Author(s).},
	keywords = {SPHERES; Thermodynamic stability; Gases; Degrees of freedom (mechanics); ISOTHERMS; Gravitation; Phase equilibria; Van der Waals forces; Gas dynamics; Liquefied gases; Equations of state of gases; Governing equations; Gas models; Thermodynamic modelling; perfect gas; Equations of state of liquids; Van der Waal; Self-gravitation; Isothermal spheres; Molecular attraction; Van der Waals gas; Van der waals models},
	year = {2024},
	eissn = {1089-7666},
	orcid-numbers = {Ván, Péter/0000-0002-9396-4073; Szücs, Mátyás/0000-0002-2492-0392}
}

@article{MTMT:34297744,
	title = {Heat equations beyond Fourier: From heat waves to thermal metamaterials},
	url = {https://m2.mtmt.hu/api/publication/34297744},
	author = {Kovács, Róbert Sándor},
	doi = {10.1016/j.physrep.2023.11.001},
	journal-iso = {PHYS REP},
	journal = {PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS},
	volume = {1048},
	unique-id = {34297744},
	issn = {0370-1573},
	year = {2024},
	eissn = {1873-6270},
	pages = {1-75},
	orcid-numbers = {Kovács, Róbert Sándor/0000-0001-5822-6035}
}

@article{MTMT:34225898,
	title = {Nonlinear thermal analysis of two-dimensional materials with memory},
	url = {https://m2.mtmt.hu/api/publication/34225898},
	author = {Munafò, C.F. and Rogolino, P. and Kovács, Róbert Sándor},
	doi = {10.1016/j.ijheatmasstransfer.2023.124847},
	journal-iso = {INT J HEAT MASS TRANS},
	journal = {INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER},
	volume = {219},
	unique-id = {34225898},
	issn = {0017-9310},
	abstract = {A nonlinear hyperbolic heat transport equation has been proposed based on the Cattaneo model without mechanical effects. We analyze the two-dimensional Maxwell-Cattaneo-Vernotte heat equation in a medium subjected to homogeneous and non-homogeneous boundary conditions and with thermal conductivity and relaxation time linearly dependent on temperature. Since these nonlinearities are essential from an experimental point of view, it is necessary to establish an effective and reliable way to solve the system of partial differential equations and study the behavior of temperature evolution. A numerical scheme of finite differences for the solution of the two-dimensional non-Fourier heat transfer equation is introduced and studied. We also investigate the attributes of the numerical method from the aspects of stability, dissipation and dispersive errors.},
	keywords = {THERMODYNAMICS; Engineering, Mechanical; extended irreversible thermodynamics; second sound; Nonlinear heat transport; GENERALIZED HEAT-CONDUCTION; 2ND SOUND},
	year = {2024},
	eissn = {1879-2189},
	orcid-numbers = {Kovács, Róbert Sándor/0000-0001-5822-6035}
}

@article{MTMT:35394671,
	title = {Field equation of thermodynamic gravity and galactic rotational curves},
	url = {https://m2.mtmt.hu/api/publication/35394671},
	author = {Pszota, Máté and Ván, Péter},
	doi = {10.1016/j.dark.2024.101660},
	journal-iso = {PHYS DARK UNIVERSE},
	journal = {PHYSICS OF THE DARK UNIVERSE},
	volume = {46},
	unique-id = {35394671},
	issn = {2212-6864},
	year = {2024},
	eissn = {2212-6864},
	orcid-numbers = {Pszota, Máté/0009-0008-4247-2918; Ván, Péter/0000-0002-9396-4073}
}

@article{MTMT:35180177,
	title = {Numerical analysis of the Maxwell-Cattaneo-Vernotte nonlinear model},
	url = {https://m2.mtmt.hu/api/publication/35180177},
	author = {Ramos, Anderson and Campelo, Anderson and Freitas, Mirelson and Kovács, Róbert Sándor},
	doi = {10.1080/01495739.2024.2391749},
	journal-iso = {J THERM STRESSES},
	journal = {JOURNAL OF THERMAL STRESSES},
	volume = {47},
	unique-id = {35180177},
	issn = {0149-5739},
	year = {2024},
	eissn = {1521-074X},
	pages = {1262-1276},
	orcid-numbers = {Ramos, Anderson/0000-0002-2803-3248; Kovács, Róbert Sándor/0000-0001-5822-6035}
}

@article{MTMT:34751430,
	title = {Assessment of prosumer-based energy system for rural areas by using TRNSYS software},
	url = {https://m2.mtmt.hu/api/publication/34751430},
	author = {Rana, Aqsa and Gróf, Gyula István},
	doi = {10.1016/j.cles.2024.100110},
	journal-iso = {CLEANER ENERGY SYSTEMS},
	journal = {CLEANER ENERGY SYSTEMS},
	volume = {8},
	unique-id = {34751430},
	abstract = {The prosumers are the new performers progressing towards a low-carbon future. Renewable-based power generation is essential, even in rural areas, to pave a path toward sustainable development. This study establishes a simulation model for two identical residential buildings to assess the prosumer's impact on future local (standalone) energy systems. According to the climate condition of Pakistan, the technical, economic, and environmental performance of the standalone system is evaluated using TRNSYS software. Assumptions and modeling of different components, photovoltaic (PV) panels, and batteries are also discussed. This study provides the starting point of a real-time framework of energy trade between two rural houses connected with a common microgrid. Both houses are medium-sized family houses with almost identical electricity demands. One house has PV mounted on the rooftop, with the battery as an optimal energy storage option. Attention is given to peak demand management and surplus energy during enough production hours. A dynamic energy management approach between two buildings is proposed based on TRNSYS and blockchain. Simulation results show that the real-time implementation of local energy production and energy trading at the household level facilitates achieving the dual benefits of reducing consumer costs and maximizing self-consumption. © 2024 The Author(s)},
	keywords = {Renewable energy; digitalization; prosumer; Electrification; energy trade},
	year = {2024},
	eissn = {2772-7831},
	orcid-numbers = {Rana, Aqsa/0000-0002-2400-8256; Gróf, Gyula István/0000-0002-6359-768X}
}

@article{MTMT:34568142,
	title = {Assessment of local energy trading in a residential energy hub with demand management},
	url = {https://m2.mtmt.hu/api/publication/34568142},
	author = {Rana, Aqsa and Gróf, Gyula István},
	doi = {10.1016/j.egyr.2024.01.030},
	journal-iso = {ENERGY REP},
	journal = {ENERGY REPORTS},
	volume = {11},
	unique-id = {34568142},
	issn = {2352-4847},
	abstract = {The energy hub approach facilitates the interconnection of diverse energy infrastructures. This paper presents a mathematical formulation to evaluate the operational mode of a residential energy hub model for assessing the possible level of local energy trading. Electricity and natural gas are the inputs of this energy hub that meet a typical house's electric and heat demands. Integrating renewable energy sources and energy storage systems streamlines the energy hub framework. A home load management (HLM) strategy is proposed to manage the energy consumption of responsive appliances. Solar panels and battery operation are coordinated with the household demand response to minimize the customer cost and maximize self-consumption. The main objective of this study is to reduce consumer costs by considering the hourly effects of time varying electric tariffs on energy hub optimization results. The presented results proved that the HLM application alone reduced the daily payment of customers by around 15% compared to those without HLM. The increased surplus energy may be a basis for local energy trading without grid involvement and is considered a viable option to further reduce customer payments. A novel approach is analyzed using TRNSYS software to identify real-time execution of household-level energy production and local trading potential. Furthermore, the contribution of HLM to energy sharing is investigated at the prosumer-consumer perspective. © 2024 The Authors},
	keywords = {Housing; Renewable energy; Renewable energy; Energy trading; Energy trading; Electric load management; Renewable energies; Energy utilization; Sales; Electric energy storage; Energy hub; mathematical formulation; Power markets; local energy; Demand response programs; Energy infrastructures; Electric power plant loads; residential energy; demand response program; Energy hubs; Home load management; Home load management; Operational modes},
	year = {2024},
	eissn = {2352-4847},
	pages = {1642-1658},
	orcid-numbers = {Rana, Aqsa/0000-0002-2400-8256; Gróf, Gyula István/0000-0002-6359-768X}
}

@article{MTMT:35218256,
	title = {Prosumer potential assessment and techno-economic feasibility analysis of rural electrification},
	url = {https://m2.mtmt.hu/api/publication/35218256},
	author = {Rana, Aqsa and Gróf, Gyula István},
	doi = {10.1016/j.ecmx.2024.100542},
	journal-iso = {ENERGY CONVERS MANAG: X},
	journal = {ENERGY CONVERSION AND MANAGEMENT: X},
	volume = {22},
	unique-id = {35218256},
	issn = {2590-1745},
	abstract = {The expansion of the industrial sector and the continuous increase in population are the reasons for the ever-increasing demand for electricity, which directly burdens the central grid. Absence and remoteness from the central grid make off-grid power generation the most reliable source of electricity to meet the needs of peripheral areas. Electrification of remote areas through decentralized generation using renewable energy sources has emerged as a low-cost and practically viable solution. Domestic-level energy trading makes the system more cost-effective. This study develops a hybrid energy model consisting of PV and diesel generators to electrify a remote village, considering the feasibility analysis of consumer-prosumer-based energy trading potential. First, resource evaluation and total load demand are estimated at the selected site, then system sizing optimization and techno-economic feasibility are evaluated using HOMER Pro software. Based on the optimized system, a new system is proposed and developed using HOMER Pro software to investigate the energy trading potential. Economic rationality is checked using the economic parameters of net present cost, levelized cost of electricity, initial capital, and operation and maintenance cost of the system. A sensitivity analysis is performed further to evaluate the system's feasibility under different conditions. This study fills the energy trading sector gap by providing a more efficient and cost-effective simulation-based study. The results show that the proposed system has a 22 % lower net present cost, 66 % lower levelized cost of electricity, 25.5 % lower operation and maintenance cost, and 4.36 % lower initial cost.},
	year = {2024},
	eissn = {2590-1745},
	orcid-numbers = {Rana, Aqsa/0000-0002-2400-8256; Gróf, Gyula István/0000-0002-6359-768X}
}

@article{MTMT:34867898,
	title = {Leading elliptic relationship for supercritical fluids in the Widom region},
	url = {https://m2.mtmt.hu/api/publication/34867898},
	author = {Takács, Donát M. and Fülöp, Tamás and Imre, Attila},
	doi = {10.1016/j.supflu.2024.106216},
	journal-iso = {J SUPERCRIT FLUID},
	journal = {JOURNAL OF SUPERCRITICAL FLUIDS},
	volume = {208},
	unique-id = {34867898},
	issn = {0896-8446},
	abstract = {It is well-known that the behaviour of supercritical fluids near the critical point changes considerably in the region around the Widom lines. We have found, for pure fluids, that the relationship between the thermal expansion coefficient and the isothermal compressibility is not only highly nonlinear in this region but in a certain temperature range can also be approximated well at constant pressure by a quadratic relationship, i.e., an ellipse. In this paper, we show this analytically, and demonstrate it for the van der Waals, Berthelot and IAPWS-95 water models numerically. Furthermore, the parameters of the ellipse are discovered to obey power and linear laws. The parameters of these laws are determined for the three aforementioned models.},
	year = {2024},
	eissn = {1872-8162},
	orcid-numbers = {Takács, Donát M./0000-0002-8463-745X; Fülöp, Tamás/0000-0003-2708-7065; Imre, Attila/0000-0003-4604-5899}
}

@article{MTMT:34575282,
	title = {Thermodynamically extended symplectic numerical simulation of viscoelastic, thermal expansion and heat conduction phenomena in solids},
	url = {https://m2.mtmt.hu/api/publication/34575282},
	author = {Takács, Donát M. and Pozsár, Áron and Fülöp, Tamás},
	doi = {10.1007/s00161-024-01280-w},
	journal-iso = {CONTINUUM MECH THERM},
	journal = {CONTINUUM MECHANICS AND THERMODYNAMICS},
	volume = {36},
	unique-id = {34575282},
	issn = {0935-1175},
	abstract = {Symplectic numerical schemes for reversible dynamical systems predict the solution reliably over large times as well, and are a good starting point for extension to schemes for simulating irreversible situations like viscoelastic wave propagation and heat conduction coupled via thermal expansion occuring in rocks, plastics, biological samples etc. Dissipation error (artificial nonpreservation of energies and amplitudes) of the numerical solution should be as small as possible since it should not be confused with the real dissipation occurring in the irreversible system. In addition, the other well-known numerical artefact, dispersion error (artificial oscillations emerging at sharp changes), should also be minimal to avoid confusion with the true wavy behavior. The continuum thermodynamical aspects (respect for balances with fluxes, systematic constitutive relationships between intensive quantities and fluxes, the second law of thermodynamics with positive definite entropy production, and the spacetime-based kinematic viewpoint) prove valuable for obtaining such extended schemes and for monitoring the solutions. Generalizing earlier works in this direction, here, we establish and investigate such a numerical scheme for one-dimensional viscoelastic wave propagation in the presence of heat conduction coupled via thermal expansion, demonstrating long-term reliability and the applicability of thermodynamics-based quantities in supervising the quality of the solution.},
	year = {2024},
	eissn = {1432-0959},
	pages = {525-538},
	orcid-numbers = {Takács, Donát M./0000-0002-8463-745X; Fülöp, Tamás/0000-0003-2708-7065}
}

@article{MTMT:34259085,
	title = {Szimplektikus numerikus módszerek és műszaki alkalmazásuk néhány gyakorlati szempontja [Symplectic numerical methods and some practical aspects of their application for engineering problems]},
	url = {https://m2.mtmt.hu/api/publication/34259085},
	author = {Takács, Donát M. and Fülöp, Tamás},
	doi = {10.35925/j.multi.2024.4.1},
	journal-iso = {MULTIDISZCIPLINÁRIS TUDOMÁNYOK},
	journal = {MULTIDISZCIPLINÁRIS TUDOMÁNYOK: A MISKOLCI EGYETEM KÖZLEMÉNYE},
	volume = {14},
	unique-id = {34259085},
	issn = {2062-9737},
	year = {2024},
	eissn = {2786-1465},
	pages = {3-23},
	orcid-numbers = {Takács, Donát M./0000-0002-8463-745X; Fülöp, Tamás/0000-0003-2708-7065}
}

@article{MTMT:34757577,
	title = {Two-field mixed hp-finite elements for time-dependent problems in the refined theories of thermodynamics},
	url = {https://m2.mtmt.hu/api/publication/34757577},
	author = {Tóth, Balázs and Molnár, Zsombor and Kovács, Róbert Sándor},
	doi = {10.1007/s00161-024-01300-9},
	journal-iso = {CONTINUUM MECH THERM},
	journal = {CONTINUUM MECHANICS AND THERMODYNAMICS},
	volume = {36},
	unique-id = {34757577},
	issn = {0935-1175},
	abstract = {Modern manufacturing technologies allow heterogeneous materials with complex inner structures (e.g., foams) to be easily produced. However, their utilization is not straightforward, as the classical constitutive laws are not necessarily valid. According to various experimental observations, the Guyer–Krumhansl equation is a promising candidate for modeling such complex structures. However, practical applications need a reliable and efficient algorithm capable of handling both complex geometries and advanced heat equations. In the present paper, we derive new two-field variational formulations which treat the temperature and the heat flux as independent field variables, and we develop new, advanced hp -type mixed finite element methods, which can be reliably applied. We investigate their convergence properties for various situations, challenging in relation to stability and the treatment of fast propagation speeds. That algorithm is also proved to be outstandingly efficient, providing solutions four magnitudes faster than commercial algorithms.},
	year = {2024},
	eissn = {1432-0959},
	pages = {825-838},
	orcid-numbers = {Tóth, Balázs/0000-0002-5419-2234; Kovács, Róbert Sándor/0000-0001-5822-6035}
}

@article{MTMT:34717230,
	title = {A torziós ingák jelentősége Eötvös Loránd születése után 175 évvel},
	url = {https://m2.mtmt.hu/api/publication/34717230},
	author = {Völgyesi, Lajos and Szondy, György and Tóth, Gyula and Fenyvesi, Edit and Kovács, Péter Gábor and Kiss, Bálint and Égető, Csaba and Barnaföldi, Gergely Gábor and Lévai, Péter and Ván, Péter},
	doi = {10.1556/2065.185.2024.3.4},
	journal-iso = {MAGYAR TUDOMÁNY},
	journal = {MAGYAR TUDOMÁNY},
	volume = {185},
	unique-id = {34717230},
	issn = {0025-0325},
	abstract = {Eötvös Loránd 1848. július 27.-én született, így 2023-ban ünnepeljük a születésének 175. évfordulóját. Nevéhez a fizika tudománytörténetében számos nagy felfedezés kötődik, igazi hírnevét, elismertségét azonban zseniális találmánya, a róla elnevezett torziós inga hozta meg. Híres műszerének első példányát, a horizontális variométert 1890-ben építette meg, amelyet élete során folyamatosan továbbfejlesztett. Érdemes röviden áttekinteni, hogy 175 évvel Eötvös Loránd születése után, és több mint 130 évvel az első torziós ingája elkészítését követően mi a jelenlegi szerepe és jelentősége az Eötvös-ingának. Jelenleg Magyarországon három tudományterületen használjuk a torziós ingát. A fizikai geodéziában az ingával mérhető görbületi gradienseket a Föld elméleti alakja, a geoid finomszerkezetének meghatározására használjuk, a fizikában Eötvösék mérési pontosságát közel 2 nagyságrenddel felülmúlva a súlyos és a tehetetlen tömeg azonosságát igazoló ekvivalancia-elv újramérését végezzük, legújabban pedig felmerült a lehetősége bizonyos földrengések torziós ingával történő előrejelezhetőségének.},
	year = {2024},
	eissn = {1588-1245},
	pages = {331-343},
	orcid-numbers = {Völgyesi, Lajos/0000-0002-3196-4887; Tóth, Gyula/0000-0002-0280-9060; Égető, Csaba/0000-0001-7722-852X; Ván, Péter/0000-0002-9396-4073}
}