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1
Content available Palaeoenvironmental and palaeoclimatic inferences based on X-ray computer tomography: a case study of alkaline lake deposits in Hungary
Alzoubi Nour N., Gulyas Sandor, Geiger Janos
Geologos
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2023
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Vol. 29, No. 1
33--49
EN
Widely distributed freshwater carbonate sediments, i.e., limestone, dolomitic limestone and dolomite, developed in inter-dune alkaline ponds of the Danube-Tisza Interfluve in the centre of the Carpathian Basin during the Holocene. The key parameters that determine the formation of any given type of carbonate mineral (calcite, dolomite) are temperature, evaporation rate, pH and ion concentrations, in addition to CO2 absorption by aquatic plants. CT analysis is capable of recording small-scale density variations attributable to compositional differences of sedimentary rocks. As the type and proportion of rock-forming minerals and other components is an artifact of past environmental and climatic conditions, CT values may act as potential palaeoenvironmental proxies. The present study compares variations in rock-forming components obtained for freshwater carbonates utilizing the CT method with already available geochemical and palaeoecological proxy data. Variations in molluscan ecology and isotope geochemistry, sedimentation times and CT-based rock density values all indicate the relevance of millennial-scale, climate-driven changes in carbonate formation. As previously observed, the emergence of colder conditions in the North Atlantic, which resulted in increased cyclonic activity and heavier rainfall in western Europe and the Danube watershed area between 10.3 and 9.3 kyr cal BP, resulted in the emergence of humid conditions favouring a rise in the groundwater table at our site and precipitation of calcite from pore waters as opposed to high-magnesium calcite. This is clearly reflected in a negative shift in CT density values in our dated rock samples.
2
Content available The stochastic model of quasi-stationary non-isothermal mode of transport and distribution of natural gas in the gas transportation systems
Tevyashev A., Mamedova A., Iievlieva S., Frolov V.
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
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2017
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Vol. 6, No 4
121--133
EN
The paper presents a stochastic model of a quasi-stationary non-isothermal mode of transport and distribution of natural gas in gas transportation systems with multilinear linear sections of pipeline and a lot of craft compressor stations. A method for calculating the statistical properties of the dependent variables of the model from the statistical properties of the independent variables.
3
Content available Statystyczna analiza strugi urobku generowanej przez koparkę kołową
Czaplicki J.
Górnictwo Odkrywkowe
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2014
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R. 55, nr 1
22--28
PL
Przedmiotem rozważań w niniejszej pracy jest strumień urobku generowany przez koparkę kołową, mając na uwadze jego właściwości statystyczne. Informacja o zidentyfikowanych własnościach stanowiła podstawę do wyboru modelu opisującego ten strumień. Analiza została dokonana w oparciu o dane kopalniane, jakie zebrano przy realizacji pracy doktorskiej wykonywanej na Politechnice Wrocławskiej. W literaturze opisującej wnioskowanie o właściwościach strumienia na podstawie zebranego materiału, zaprezentowano nieco inne rezultaty aniżeli w niniejszej pracy.
EN
A subject of consideration here is a stream of excavated rock won by BWE taking into account statistical properties of the stream. Information on the identified properties was a ground to select an appropriate model that describes the stream. Statistical analysis was done basing on data collected from the field investigation that was carried out to accomplish Ph.D. dissertation realised on Wrocław Technical University. In literature describing statistical inference on the properties of the stream a different approach and results are presented than that described here.
4
Content available Performance test of network devices
Bolanowski M., Paszkiewicz A.
Annales Universitatis Mariae Curie-Skłodowska. Sectio AI, Informatica
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2013
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Vol. 13, no. 1
29--36
EN
Selection of components in contemporary computer networks is extremely important, not only because of the project budget but also because of the network performance. Therefore, it is necessary to perform tests before deploying devices. In this paper the authors show that the performance of test network devices is dependent on the nature of network traffic including its statistical properties. Also a new hybrid model of the system for testing the network device based on the q-additivity of traffic flows was proposed.
5
Content available remote Thermal conductivity of 2D random interfaces
Szecówka M., Domański Z.
Prace Naukowe Instytutu Matematyki i Informatyki Politechniki Częstochowskiej
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2010
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Vol. 9, nr 2
229-234
EN
Heat transfer through dense granular interfaces formed by squares or triangles with randomly assigned thermal conductivities is discussed. The effective thermal conductivities of the interface are found by means of the steady heat flux induced by connection of interface with the external heat source assuring the constant value of boundary temperature. Some statistical properties of effective conductivities are also presented.
6
Content available remote Improving Statistical Properties of Number Sequences Generated by Multiplicative Congruential Pseudorandom Generator
Jessa M.
Advances in Electronics and Telecommunications
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2010
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Vol. 1, no. 2
51--54
EN
A new method of improving the properties of number sequences produced by a multiplicative congruential pseudorandom generator (MCPG) was proposed. The characteristic feature of the method is the simultaneous usage of numbers generated by the sawtooth chaotic map, realized in a finitestate machine, and symbols produced by the same map. The period of generated sequences can be significantly longer than the period of sequences produced by a multiplicative congruential pseudorandom generator realized in the same machine. It is shown that sequences obtained with the use of the proposed method pass all statistical tests from the standard NIST statistical test suite v.1.8.
7
Content available remote Energy spectrum of frustrated granular materials
Błaszczuk J., Domański Z.
Prace Naukowe Instytutu Matematyki i Informatyki Politechniki Częstochowskiej
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2003
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Vol. 2, nr 1
25--29
EN
We study the statistical properties of low lying energy states for some special models of two dimensional frustrated granular materials.
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