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Featured researches published by Wojciech Mastej.


Geologos | 2015

Analysis of lithofacies cyclicity in the Miocene Coal Complex of the Bełchatów lignite deposit, south-central Poland

Wojciech Mastej; Tomasz Bartuś; Jerzy Rydlewski

Abstract Markov chain analysis was applied to studies of cyclic sedimentation in the Coal Complex of the Bełchatów mining field (part of the Bełchatów lignite deposit). The majority of ambiguous results of statistical testing that were caused by weak, statistically undetectable advantage of either cyclicity over environmental barriers or vice versa, could be explained if only the above-mentioned advantages appeared in the neighbourhood. Therefore, in order to enhance the credibility of statistical tests, a new approach is proposed here in that matrices of observed transition numbers from different boreholes should be added to increase statistical reliability if they originated in a homogeneous area. A second new approach, which consists of revealing statistically undetectable cyclicity of lithofacies alternations, is proposed as well. All data were derived from the mining data base in which differentiation between lithology and sedimentary environments was rather weak. For this reason, the methodological proposals are much more important than details of the sedimentation model in the present paper. Nevertheless, they did reveal some interesting phenomena which may prove important in the reconstruction of peat/lignite environmental conditions. First of all, the presence of cyclicity in the sedimentation model, i.e., cyclic alternation of channel and overbank deposits, represents a fluvial environment. It was also confirmed that the lacustrine subenvironment was cut off from a supply of clastic material by various types of mire barriers. Additionally, our analysis revealed new facts: (i) these barriers also existed between lakes in which either carbonate or clay sedimentation predominated; (ii) there was no barrier between rivers and lakes in which clay sedimentation predominated; (iii) barriers were less efficient in alluvial fan areas but were perfectly tight in regions of phytogenic or carbonate sedimentation; (iv) groundwater, rather than surface flow, was the main source of CaCO3 in lakes in which carbonate sedimentation predominated; (v) a lack of cyclic alternation between abandoned channels and pools with clayey sedimentation; (vi) strong evidence for autocyclic alternation of phytogenic subenvironments and lakes in which carbonate sedimentation predominated was found in almost all areas studied.


Journal of Physics: Conference Series | 2016

Determination of void fraction in two phase liquid-gas flow using gamma absorption

Marcin Zych; Robert Hanus; Marek Jaszczur; Anna Strzępowicz; Leszek Petryka; Wojciech Mastej

Full description of a two-phase liquid-gas flow requires the designation of lot parameters. First one, which describes which part of the pipeline is fulfilled by the gas, is the void fraction. Moreover the share of gas in a flowing mixture determines the structure of the flow and also affects the velocity of the individual phases. In that case void fraction can be determined by use the gamma absorption method, as well as other flow parameters may be evaluated by the same equipment. In addition the article presents the calibration of radiometric set, which consists of gamma radiation source Am-241 and scintillation probe NaI(Tl), for determination of the void fraction, illustrated by exemplary results of the described method application to various structures of air-water flow in the horizontal pipeline.


Geoturystyka | 2009

Atrakcje geoturystyczne Geostrady Wschodniosudeckiej

Tadeusz Słomka; Marek Doktor; Tomasz Bartuś; Wojciech Mastej; Marek Łodziński


Geoturystyka | 2009

Koncepcja projektu: "Geostrada Sudecka - studium geologiczno-krajobrazowe z inwentaryzacją obiektów dziedzictwa przyrody nieożywionej"

Tadeusz Słomka; Tomasz Bartuś; Wojciech Mastej; Marek Łodziński; Wojciech Mayer; M. Stefaniuk; Marek Doktor; J. Koźma; S. Cwojdziński; A. Stachowiak


Annales Societatis Geologorum Poloniae | 2010

Testing the randomness of lithostratigraphic successions with the Markov Chain methods

Marek Doktor; Andrzej J. Krawczyk; Wojciech Mastej


Archive | 2009

Atrakcje geoturystyczne Geostrady Zachodniosudeckiej Geotourist attractions of the Western Sudetic Geostrada

Wojciech Mayer; Wojciech Mastej


Archive | 2009

Atrakcje geoturystyczne Geostrady Wschodniosudeckiej Geotourist attractions of the Eastern Sudetic Geostrada

Marek Doktor; Wojciech Mastej


Geotourism/Geoturystyka | 2009

Geotourist attractions of the Central Sudetic Geostrada

Marek Łodziński; Wojciech Mayer; Michał Stefaniuk; Tomasz Bartuś; Wojciech Mastej


EPJ Web of Conferences | 2015

Analysis of radiometric signal in sedimentating suspension flow in open channel

Marcin Zych; Robert Hanus; Leszek Petryka; Dariusz Świsulski; Marek Doktor; Wojciech Mastej


Geoturystyka | 2009

Atrakcje geoturystyczne Geostrady Środkowosudeckiej

Tomasz Bartuś; Wojciech Mastej; Marek Łodziński

Collaboration


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Tomasz Bartuś

AGH University of Science and Technology

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Marek Doktor

AGH University of Science and Technology

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Marek Łodziński

AGH University of Science and Technology

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Tadeusz Słomka

AGH University of Science and Technology

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Wojciech Mayer

AGH University of Science and Technology

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J. Mucha

AGH University of Science and Technology

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Leszek Petryka

AGH University of Science and Technology

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Marcin Zych

AGH University of Science and Technology

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Robert Hanus

Rzeszów University of Technology

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Anna Strzępowicz

AGH University of Science and Technology

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