@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}
}

@{MTMT:34042297,
	title = {Analytical evaluation of non–Fourier heat pulse experiments on room temperature},
	url = {https://m2.mtmt.hu/api/publication/34042297},
	author = {Fehér, Anna Éva and Kovács, Róbert Sándor},
	booktitle = {19th European Meeting on Supercritical Fluids},
	unique-id = {34042297},
	year = {2023},
	pages = {162-162},
	orcid-numbers = {Fehér, Anna Éva/0000-0002-2366-6388; Kovács, Róbert Sándor/0000-0001-5822-6035}
}

@{MTMT:33766899,
	title = {Általánosított termodinamikai modellek kísérleti kiértékelési módszertana [An evaluation procedure of experimental data for generalized thermodynamic models]},
	url = {https://m2.mtmt.hu/api/publication/33766899},
	author = {Fehér, Anna Éva and Kovács, Róbert Sándor},
	booktitle = {Kőzetmechanika és termodinamika [Rock mechanics and thermodynamics]},
	unique-id = {33766899},
	year = {2023},
	pages = {3-16},
	orcid-numbers = {Fehér, Anna Éva/0000-0002-2366-6388; Kovács, Róbert Sándor/0000-0001-5822-6035}
}

@CONFERENCE{MTMT:34042770,
	title = {Non-Fourier heat pulse experiments and evaluation for heterogeneous materials},
	url = {https://m2.mtmt.hu/api/publication/34042770},
	author = {Fehér, Anna Éva and Kovács, Róbert Sándor},
	booktitle = {Joint European Thermodynamics Conference 2023},
	unique-id = {34042770},
	year = {2023},
	pages = {75-75},
	orcid-numbers = {Fehér, Anna Éva/0000-0002-2366-6388; Kovács, Róbert Sándor/0000-0001-5822-6035}
}

@CONFERENCE{MTMT:34042794,
	title = {Emergence of non-Fourier heat conduction for heterogeneous materials},
	url = {https://m2.mtmt.hu/api/publication/34042794},
	author = {Kovács, Róbert Sándor and Fehér, Anna Éva},
	booktitle = {Joint European Thermodynamics Conference 2023},
	unique-id = {34042794},
	year = {2023},
	pages = {76-76},
	orcid-numbers = {Kovács, Róbert Sándor/0000-0001-5822-6035; Fehér, Anna Éva/0000-0002-2366-6388}
}

@misc{MTMT:33908905,
	title = {Recent results by the Irreversible Thermodynamics Research Group of Budapest University of Technology and Economics},
	url = {https://m2.mtmt.hu/api/publication/33908905},
	author = {Fehér, Anna Éva and Fülöp, Tamás and Kovács, Róbert Sándor and Pozsár, Áron and Szücs, Mátyás and Takács, Donát M. and Ván, Péter},
	unique-id = {33908905},
	year = {2022},
	orcid-numbers = {Fehér, Anna Éva/0000-0002-2366-6388; Fülöp, Tamás/0000-0003-2708-7065; Kovács, Róbert Sándor/0000-0001-5822-6035; Szücs, Mátyás/0000-0002-2492-0392; Takács, Donát M./0000-0002-8463-745X; Ván, Péter/0000-0002-9396-4073}
}

@article{MTMT:33646504,
	title = {Analytical evaluation of non-Fourier heat pulse experiments on room temperature},
	url = {https://m2.mtmt.hu/api/publication/33646504},
	author = {Fehér, Anna Éva and Kovács, Róbert Sándor},
	doi = {10.1016/j.ifacol.2022.08.035},
	journal-iso = {IFACOL},
	journal = {IFAC PAPERSONLINE},
	volume = {55},
	unique-id = {33646504},
	issn = {2405-8971},
	year = {2022},
	eissn = {2405-8963},
	pages = {87-92},
	orcid-numbers = {Fehér, Anna Éva/0000-0002-2366-6388; Kovács, Róbert Sándor/0000-0001-5822-6035}
}

@article{MTMT:33400553,
	title = {Heterogén anyagok hőimpulzus kísérletének kiértékelési eljárása},
	url = {https://m2.mtmt.hu/api/publication/33400553},
	author = {Fehér, Anna Éva and Kovács, Róbert Sándor},
	journal-iso = {MAGYAR ENERGETIKA},
	journal = {MAGYAR ENERGETIKA},
	volume = {29},
	unique-id = {33400553},
	issn = {1216-8599},
	year = {2022},
	pages = {2-10},
	orcid-numbers = {Fehér, Anna Éva/0000-0002-2366-6388; Kovács, Róbert Sándor/0000-0001-5822-6035}
}

@CONFERENCE{MTMT:33079172,
	title = {OBSERVING SIZE EFFECTS IN THE THERMAL BEHAVIOUR OF ROCKS},
	url = {https://m2.mtmt.hu/api/publication/33079172},
	author = {Fehér, Anna Éva and Kovács, Róbert Sándor},
	booktitle = {18th International Conference of Young Scientists on Energy and Natural Sciences Issues},
	unique-id = {33079172},
	year = {2022},
	pages = {346-357},
	orcid-numbers = {Fehér, Anna Éva/0000-0002-2366-6388; Kovács, Róbert Sándor/0000-0001-5822-6035}
}

@inproceedings{MTMT:33591198,
	title = {Thermal and RF Characterization of Novel PLA/Flax Based Biodegradable Printed Circuit Boards},
	url = {https://m2.mtmt.hu/api/publication/33591198},
	author = {Géczy, Attila and Csiszar, Andras and Xavier, Pascal and Corrao, Nicolas and Rauly, Dominique and Kovács, Róbert Sándor and Fehér, Anna Éva and Rozs, Egon and Gál, László},
	booktitle = {Proceedings of the 24th Electronics Packaging Technology Conference (EPTC 2022), 07 – 09 December 2022, Singapore},
	doi = {10.1109/EPTC56328.2022.10013255},
	unique-id = {33591198},
	year = {2022},
	pages = {329-333},
	orcid-numbers = {Kovács, Róbert Sándor/0000-0001-5822-6035; Fehér, Anna Éva/0000-0002-2366-6388}
}

@article{MTMT:32836478,
	title = {On the two-temperature description of heterogeneous materials},
	url = {https://m2.mtmt.hu/api/publication/32836478},
	author = {Kovács, Róbert Sándor and Fehér, Anna Éva and Sobolev, S.},
	doi = {10.1016/j.ijheatmasstransfer.2022.123021},
	journal-iso = {INT J HEAT MASS TRANS},
	journal = {INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER},
	volume = {194},
	unique-id = {32836478},
	issn = {0017-9310},
	year = {2022},
	eissn = {1879-2189},
	orcid-numbers = {Kovács, Róbert Sándor/0000-0001-5822-6035; Fehér, Anna Éva/0000-0002-2366-6388}
}

@article{MTMT:32203109,
	title = {On the evaluation of non-Fourier effects in heat pulse experiments},
	url = {https://m2.mtmt.hu/api/publication/32203109},
	author = {Fehér, Anna Éva and Kovács, Róbert Sándor},
	doi = {10.1016/j.ijengsci.2021.103577},
	journal-iso = {INT J ENG SCI},
	journal = {INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE},
	volume = {169},
	unique-id = {32203109},
	issn = {0020-7225},
	year = {2021},
	eissn = {1879-2197},
	orcid-numbers = {Fehér, Anna Éva/0000-0002-2366-6388; Kovács, Róbert Sándor/0000-0001-5822-6035}
}

@article{MTMT:32130940,
	title = {Size effects and beyond-Fourier heat conduction in room-temperature experiments},
	url = {https://m2.mtmt.hu/api/publication/32130940},
	author = {Fehér, Anna Éva and Lukács, Norbert and Somlai, László Ábel and Fodor, Tamás and Szücs, Mátyás and Fülöp, Tamás and Ván, Péter and Kovács, Róbert Sándor},
	doi = {10.1515/jnet-2021-0033},
	journal-iso = {J NON-EQUIL THERMODY},
	journal = {JOURNAL OF NON-EQUILIBRIUM THERMODYNAMICS},
	volume = {46},
	unique-id = {32130940},
	issn = {0340-0204},
	year = {2021},
	eissn = {1437-4358},
	pages = {403-411},
	orcid-numbers = {Fehér, Anna Éva/0000-0002-2366-6388; Szücs, Mátyás/0000-0002-2492-0392; Fülöp, Tamás/0000-0003-2708-7065; Ván, Péter/0000-0002-9396-4073; Kovács, Róbert Sándor/0000-0001-5822-6035}
}

@inproceedings{MTMT:31794725,
	title = {Size effects and non-Fourier thermal behaviour in rocks},
	url = {https://m2.mtmt.hu/api/publication/31794725},
	author = {Fehér, Anna Éva and Markovics, Dávid and Fodor, Tamás and Kovács, Róbert Sándor},
	booktitle = {ISRM International Symposium - EUROCK 2020},
	unique-id = {31794725},
	year = {2020},
	orcid-numbers = {Fehér, Anna Éva/0000-0002-2366-6388; Kovács, Róbert Sándor/0000-0001-5822-6035}
}

@CONFERENCE{MTMT:30656146,
	title = {Mérőberendezés építése hőátadási tényező mérésére},
	url = {https://m2.mtmt.hu/api/publication/30656146},
	author = {Fehér, Anna Éva and Józsa, Viktor},
	booktitle = {OGÉT 2019 : XXVII. Nemzetközi Gépészeti Konferencia},
	unique-id = {30656146},
	year = {2019},
	pages = {121-124},
	orcid-numbers = {Fehér, Anna Éva/0000-0002-2366-6388; Józsa, Viktor/0000-0003-1220-3748}
}