@misc{MTMT:34484377,
	title = {Surfactant-Polymer Enhanced Oil Recovery Project at Algyő Field = Tenzides-Polimeres EOR Projekt Algyő mezőben},
	url = {https://m2.mtmt.hu/api/publication/34484377},
	author = {Puskás, Sándor and Törő, Mária and Vágó, Árpád and Ördög, Tibor and Tóth, Marianna and Kálmán, Gyula and Mátrai, Andrea and Nagy, Roland and Bartha, László and Hartyányi, Máté and Lakatos, István and Szentes, Gabriella and Dékány, Imre and Janovák, László and Geiger, János},
	unique-id = {34484377},
	year = {2023},
	orcid-numbers = {Hartyányi, Máté/0000-0001-6044-7689; Janovák, László/0000-0002-2066-319X; Geiger, János/0000-0001-9359-5266}
}

@article{MTMT:34401167,
	title = {Continuous wavelet transformation to quantify small-scale cycles of petrophysical properties; a new approach applied in a potential disposal repository of nuclear waste, SW Hungary},
	url = {https://m2.mtmt.hu/api/publication/34401167},
	author = {Abutaha, Saja and Geiger, János and Fedor, F and Gulyás, Sándor},
	doi = {10.4154/gc.2023.11},
	journal-iso = {GEOL CROAT},
	journal = {GEOLOGIA CROATICA},
	volume = {76},
	unique-id = {34401167},
	issn = {1330-030X},
	abstract = {Continuous Wavelet Transformation (CWT) was applied to study the small-scale repetitive oscillations of porosity distribution patterns in a 5 m silty-claystone core sample of the Boda Claystone Formation. We handled the fluctuations in voxel porosity averages over unequal depth distributions as signals over uneven time intervals. The strength of wavelet analysis lies in the ability to study the fluctuation of a signal in detail, i.e., the wavelet transforms permit automatic localization of the cyclic attributes' sequences both in time (the depth domain) and according to their frequency (the frequency domain). Thereupon, three main frequency branches (cycles) were discerned: small scale (5, 6.67, and 11 cm), intermediate scale (20, 30 cm), and large scale (66.67 cm). Depending on the CWT coefficients magnitude plot, we were able to detect the developments of porosity oscillation according to the depth variable. Thus, small-scale cycles were seen throughout the core sample., the intermediate-scale cycles were strong in the upper parts of the core sample and dwindled toward greater depths, and the large cycle was predominant in the lower part of the core sample. The cross-correlation of the wavelet coefficients of porosity and rock-forming components allows a detailed study of the inter-dependence of such parameters as their relationship changes over time. The distinct peaks at zero lag indicates that the measured wavelet coefficient series were contemporaneously correlated; their strong positive correlations suggest that both examined series respond similarly and simultaneously to other exogenous factors. The results emphasize that cyclical porosity fluctuations at all scales would concern three main factors; sediment deposition, diagenetic processes, and structural deformation (i.e., convolute laminations).},
	year = {2023},
	eissn = {1333-4875},
	pages = {131-146},
	orcid-numbers = {Abutaha, Saja/0000-0001-8439-5895; Geiger, János/0000-0001-9359-5266; Gulyás, Sándor/0000-0002-3384-2381}
}

@article{MTMT:34194777,
	title = {The use of CT analysis in revealing structural heterogeneity of freshwater carbonate decoration and construction stones [A CT-analízis alkalmazása az építő- és díszítőkőként használt édesvízi karbonátos kőzetek szerkezeti elemzésében]},
	url = {https://m2.mtmt.hu/api/publication/34194777},
	author = {Alzoubi, Nour and Gulyás, Sándor and Geiger, János},
	doi = {10.55023/issn.1786-271X.2023-010},
	journal-iso = {ARCHEOMETRIAI MŰHELY},
	journal = {ARCHEOMETRIAI MŰHELY},
	volume = {20},
	unique-id = {34194777},
	issn = {1786-271X},
	abstract = {This article presents the findings of a CT analysis conducted on freshwater carbonate rocks found in the Danube-Tisza Interfluve. These rocks are utilized for both construction and decoration purposes in the medieval buildings of the region. The aim of the study was to uncover some petrophysical properties of the rocks deriving from the Csólyospálos quarry. The proportions of the main constituents of the rocks carry significant information about the formation and alteration history of sedimentary rocks. To comprehend and assess the nature of these processes, as well as the resulting spatial variations, it is necessary to gather quantitative data on the distribution of these constituents at both macro- and microscales. The researchers employed an EMmixture analysis that considered the density differences among the individual constituents to determine the quantitative characteristics of the main components that form the rocks. By setting a threshold value to distinguish macropores (empty spaces) with lower density values from the solid matrix, the percentage of voids was calculated for each CT slice. The distribution of these voids was examined in three dimensions along all possible axial directions (X, Y, Z). Watershed algorithm, and Laplace operator were applying on selected CT slices that corresponded to areas with similar compositional features. This approach helped identify potential flow directions within the rocks. The spatial distribution and orientation of macropores, which could be visualized using CT at a resolution of over 200 microns, provided valuable insights into the paths through which water could enter the carbonate rocks used for construction or decoration. This information is crucial in understanding structural damage caused by frost weathering and dissolution via capillary action once a staticstate flow is established. Furthermore, these findings complement the results obtained from laboratory geotechnical measurements.},
	year = {2023},
	pages = {127-146},
	orcid-numbers = {Gulyás, Sándor/0000-0002-3384-2381; Geiger, János/0000-0001-9359-5266}
}

@article{MTMT:34090149,
	title = {Paleoenvironmental multiproxy dataset of the Quaternary abandoned channel in Tövises bed, Great Hungarian Plain},
	url = {https://m2.mtmt.hu/api/publication/34090149},
	author = {Eltijani, Abdelrhim and Molnár, Dávid and Geiger, János},
	doi = {10.1016/j.dib.2023.109344},
	journal-iso = {DATA BRIEF},
	journal = {DATA IN BRIEF},
	volume = {49},
	unique-id = {34090149},
	year = {2023},
	eissn = {2352-3409},
	orcid-numbers = {Molnár, Dávid/0000-0001-5304-0741; Geiger, János/0000-0001-9359-5266}
}

@article{MTMT:33992807,
	title = {Characterizing sedimentary processes in abandoned channel using compositional data analysis and wavelet transform},
	url = {https://m2.mtmt.hu/api/publication/33992807},
	author = {Eltijani, Abdelrhim and Molnár, Dávid and Geiger, János},
	doi = {10.1007/s13137-023-00223-y},
	journal-iso = {GEM - INT J GEOMATHEMATICS},
	journal = {GEM - INTERNATIONAL JOURNAL ON GEOMATHEMATICS},
	volume = {14},
	unique-id = {33992807},
	issn = {1869-2672},
	abstract = {Grain size distribution (GSD) is essential for characterizing the deposition process. However, it is necessary to consider its compositional constraint to comprehend the statistical distribution of size fractions within the sediments. Compositional data analysis (CoDA) and wavelet transform (WT) represent alternative methods beyond traditional approaches, e.g., probability density function (PDF). This paper introduces a quantitative approach for characterizing Quaternary depositional and environmental changes using abandoned channel infill sediments. The proposed approach integrates CoDA and WT to thoroughly comprehend the depositional patterns observed in abandoned channels and the underlying environmental variability. The depositional model constructed based on CoDA showed coarsening-upward sequences, suggesting a periodic connection between the main channel and the oxbow lake. Three scales of cycles consistent with the depositional model constructed using CoDA were identified based on WT: small, medium, and large-scale cycles of processes. The large-scale cycles indicate the main depositional events, while the medium and small scale reflects the variation within and during deposition. CoDA and WT demonstrate excellent potential in characterizing the GSD and interpreting oxbow lakes' deposition and sedimentation processes.},
	keywords = {Quaternary; Compositional data; wavelet transform; Mathematics, Interdisciplinary Applications; Sedimentary cycles; Abandoned channel},
	year = {2023},
	eissn = {1869-2680},
	orcid-numbers = {Molnár, Dávid/0000-0001-5304-0741; Geiger, János/0000-0001-9359-5266}
}

@article{MTMT:33801312,
	title = {Palaeoenvironmental and palaeoclimatic inferences based on X-ray computer tomography: a case study of alkaline lake deposits in Hungary},
	url = {https://m2.mtmt.hu/api/publication/33801312},
	author = {Alzoubi, Nour and Gulyás, Sándor and Geiger, János},
	doi = {10.14746/logos.2023.29.1.03},
	journal-iso = {GEOLOGOS},
	journal = {GEOLOGOS},
	volume = {29},
	unique-id = {33801312},
	issn = {1426-8981},
	year = {2023},
	eissn = {2080-6574},
	pages = {33-49},
	orcid-numbers = {Gulyás, Sándor/0000-0002-3384-2381; Geiger, János/0000-0001-9359-5266}
}

@{MTMT:33574672,
	title = {Assessing the representative elementary volume of rock types by X-ray computed tomography (CT) – a simple approach to demonstrate the heterogeneity of the Boda Claystone Formation in Hungary},
	url = {https://m2.mtmt.hu/api/publication/33574672},
	author = {Abutaha, Saja and Geiger, János and Gulyás, Sándor},
	booktitle = {GeoMATES '22 International Congress on Geomathematics in Earth- and Environmental Sciences},
	unique-id = {33574672},
	year = {2022},
	pages = {30},
	orcid-numbers = {Abutaha, Saja/0000-0001-8439-5895; Geiger, János/0000-0001-9359-5266; Gulyás, Sándor/0000-0002-3384-2381}
}

@article{MTMT:33547865,
	title = {Applying grain-size and compositional data analysis for interpretation of the Quaternary oxbow lake sedimentation processes: Eastern Great Hungarian Plain},
	url = {https://m2.mtmt.hu/api/publication/33547865},
	author = {Eltijani, Abdelrhim and Molnár, Dávid and Makó, László and Geiger, János and Sümegi, Pál},
	doi = {10.24425/sq.2022.140885},
	journal-iso = {STUD QUATER},
	journal = {STUDIA QUATERNARIA},
	volume = {39},
	unique-id = {33547865},
	issn = {1641-5558},
	abstract = {Grain size distribution is one of the paleoenvironmental proxies that provide insight statistical distribution of size fractions within the sediments. Multivariate statistics have been used to investigate the depositional process from the grain size dis-tribution. Still, the direct application of the standard multivariate methods is not straightforward and can yield misleading interpretations due to the compositional nature of the raw grain size data. This paper is a methodological framework for grain size data characterization through the centered log ratio transformation and euclidean data, coupled with principal component analysis, cluster analysis, and linear discriminant analysis to examine Quaternary sediments from Tovises bed in the southeast Great Hungarian Plain. These approaches provide statistically significant and sedimentologically interpretable results for both datasets. However, the details by which they supplemented the conceptual model were sig-nificantly different, and this discrepancy resulted in a different temporal model of the depositional history.},
	keywords = {Grain Size Distribution; Great Hungarian Plain; Multivariate statistics; Geosciences, Multidisciplinary; log ratio transformation; T?vises bed},
	year = {2022},
	eissn = {2300-0384},
	pages = {83-93},
	orcid-numbers = {Molnár, Dávid/0000-0001-5304-0741; Geiger, János/0000-0001-9359-5266; Sümegi, Pál/0000-0003-1755-4440}
}

@article{MTMT:33271059,
	title = {Defining rock-forming components of Holocene freshwater carbonates via univariate statistical and mixture analysis of computer tomography data},
	url = {https://m2.mtmt.hu/api/publication/33271059},
	author = {Alzoubi, Nour and Geiger, János and Gulyás, Sándor},
	doi = {10.24425/sq.2022.140887},
	journal-iso = {STUD QUATER},
	journal = {STUDIA QUATERNARIA},
	volume = {39},
	unique-id = {33271059},
	issn = {1641-5558},
	abstract = {Carbonate rocks are among the sedimentary systems which preserve information on the formation and diagenetic history expressed in its composition (distribution of its major rock-forming components (RFC). For estimating RFC proportions at the micro-scale, a simple counting of visible RFCs in thin sections using overlaid grids is a long-used, well-estab-lished technique. However, computer tomography (CT) analysis provides us with quantitative data in 3D at both the scale of the entire sample and a resolution defined by dimensions of the voxels at the micro-scale. The quantitative data expressed in Hounsfield units (HU) correlates with the density of RFCs. In this work statistical properties of CT-based data for selected freshwater carbonate samples from the Danube-Tisza Interfluve have been assessed using histograms and boxplots. Univariate statistical parameters characterize each sample. The maximum-likelihood method of mixture analysis has been adapted to recover and estimate the parameters of these subpopulations. Subpopulations have been defined in the form of overlapping intervals using statistical parameters gained (mean±2STD). Five major components have been defined: empty and partially or entirely filled pores by calcite, limestone micrite, dolomite micrite matrix and limonite saturated matrix. © 2022. The Author(s).},
	keywords = {Mixture analysis; CT data; freshwater carbonates; rock-forming components},
	year = {2022},
	eissn = {2300-0384},
	pages = {113-128},
	orcid-numbers = {Geiger, János/0000-0001-9359-5266; Gulyás, Sándor/0000-0002-3384-2381}
}

@article{MTMT:33194069,
	title = {Application of Parameterized Grain-Size Endmember Modeling in the Study of Quaternary Oxbow Lake Sedimentation: A Case Study of Tövises Bed Sediments in the Eastern Great Hungarian Plain},
	url = {https://m2.mtmt.hu/api/publication/33194069},
	author = {Eltijani, Abdelrhim and Molnár, Dávid and Makó, László and Geiger, János and Sümegi, Pál},
	doi = {10.3390/quat5040044},
	journal-iso = {Quaternary},
	journal = {QUATERNARY},
	volume = {5},
	unique-id = {33194069},
	issn = {2571-550X},
	abstract = {Abandoned channels are essential in the Quaternary floodplains, and their infill contains different paleoenvironment recorders. Grain-size distribution (GSD) is one proxy that helps characterize the alluviation and associated sedimentological processes of the abandoned channels. The classic statistical methods of the grain-size analysis provide insufficient information on the whole distribution; this necessitates a more comprehensive approach. Grain-size endmember modeling (EMM) is one approach beyond the traditional procedures that helps unmix the GSDs. This study describes the changes in the depositional process by unmixing the GSDs of a Holocene abandoned channel through parameterized EMM integrated with lithofacies, age–depth model, loss-on-ignition (LOI), and magnetic susceptibility (MS). This approach effectively enabled the quantification and characterization of up to four endmembers (EM1-4); the characteristics of grain-size endmembers imply changes in sedimentary environments since 8000 BP. EM1 is mainly clay and very fine silt, representing the fine component of the distribution corresponding to the background of quiet water sedimentation of the lacustrine phase. EM2 and EM3 are the intermediate components representing the distal overbank deposits of the flood. EM4 is dominated by coarse silt and very fine sand, representing deposition of overbank flow during the flood periods. This paper demonstrates that the parametrized grain-size EMM is reasonable in characterizing abandoned channel infill sedimentary depositional and sedimentation history.},
	year = {2022},
	orcid-numbers = {Eltijani, Abdelrhim/0000-0002-6952-158X; Molnár, Dávid/0000-0001-5304-0741; Geiger, János/0000-0001-9359-5266; Sümegi, Pál/0000-0003-1755-4440}
}