@article{MTMT:33093510, title = {Fully spherical 3D datasets on sedimentary particles: Fast measurement and evaluation}, url = {https://m2.mtmt.hu/api/publication/33093510}, author = {Fehér, Eszter and Havasi-Tóth, Balázs and Ludmány, Balázs}, doi = {10.1556/24.2022.00124}, journal-iso = {CENT EUR GEOL}, journal = {CENTRAL EUROPEAN GEOLOGY}, volume = {65}, unique-id = {33093510}, issn = {1788-2281}, abstract = {Recently it became increasingly evident that the statistical distributions of size and shape descriptors of sedimentary particles reveal crucial information on their evolution and may even carry the fingerprints of their provenance as fragments. However, to unlock this trove of information, measurement of traditional geophysical shape descriptors (mostly detectable on 2D projections) is not sufficient; fully spherical 3D imaging and mathematical algorithms suitable to extract new types of inherently 3D shape descriptors are necessary. Available 3D imaging technologies force users to choose either speed or full sphericity. Only partial morphological information can be extracted in the absence of the latter (e.g., LIDAR imaging). In the case of fully spherical imaging, speed was proved to be prohibitive for obtaining meaningful statistical samples, and inherently 3D shape descriptors were not extracted. Here we present a new method by complementing a commercial, portable 3D scanner with simple hardware to quickly obtain fully spherical 3D datasets from large collections of sedimentary particles. We also present software for the automated extraction of 3D shapes and automated measurement of inherently 3D-shape properties. This technique allows for examining large samples without the need for transportation or storage of the samples, and it may also facilitate the collaboration of geographically distant research groups. We validated our software on a large sample of pebbles by comparing previously hand-measured parameters with the results of automated shape analysis. We also tested our hardware and software tools on a large pebble sample in Kawakawa Bay, New Zealand.}, year = {2022}, eissn = {1789-3348}, pages = {111-121}, orcid-numbers = {Fehér, Eszter/0000-0002-4022-7221; Ludmány, Balázs/0000-0001-5373-7610} } @article{MTMT:31890542, title = {Particle size dynamics in abrading pebble populations}, url = {https://m2.mtmt.hu/api/publication/31890542}, author = {Sipos, András Árpád and Domokos, Gábor and Török, János}, doi = {10.5194/esurf-9-235-2021}, journal-iso = {E SURF DYN}, journal = {EARTH SURFACE DYNAMICS}, volume = {9}, unique-id = {31890542}, issn = {2196-6311}, abstract = {Abrasion of sedimentary particles in fluvial and eolian environments is widely associated with collisions encountered by the particle. Although the physics of abrasion is complex, purely geometric models recover the course of mass and shape evolution of individual particles in low- and middle-energy environments (in the absence of fragmentation) remarkably well. In this paper, we introduce the first model for the collision-driven collective mass evolution of sedimentary particles. The model utilizes results of the individual, geometric abrasion theory as a collision kernel; following techniques adopted in the statistical theory of coagulation and fragmentation, the corresponding Fokker–Planck equation is derived. Our model uncovers a startling fundamental feature of collective particle size dynamics: collisional abrasion may, depending on the energy level, either focus size distributions, thus enhancing the effects of size-selective transport, or it may act in the opposite direction by dispersing the distribution.}, year = {2021}, eissn = {2196-632X}, pages = {235-251}, orcid-numbers = {Sipos, András Árpád/0000-0003-0440-2165} } @{MTMT:30359957, title = {The Geometry of Abrasion}, url = {https://m2.mtmt.hu/api/publication/30359957}, author = {Domokos, Gábor and Gibbons, Gary W.}, booktitle = {New Trends in Intuitive Geometry}, doi = {10.1007/978-3-662-57413-3_6}, unique-id = {30359957}, year = {2018}, pages = {125-153} } @article{MTMT:3126387, title = {Impressive abrasion rates of marked pebbles on a coarse-clastic beach within a 13-month timespan}, url = {https://m2.mtmt.hu/api/publication/3126387}, author = {Bertoni, D and Sarti, G and Grottoli, E and Ciavola, P and Pozzebon, A and Domokos, Gábor and Novák-Szabó, Tímea}, doi = {10.1016/j.margeo.2016.09.010}, journal-iso = {MAR GEOL}, journal = {MARINE GEOLOGY}, volume = {381}, unique-id = {3126387}, issn = {0025-3227}, year = {2016}, eissn = {1872-6151}, pages = {175-180}, orcid-numbers = {Domokos, Gábor/0000-0002-6724-7572} }