Browsing by Subject "numerical methods"

Now showing 1 - 9 of 9

Access status: Restricted ,
Analysis of numerical methods solving differential equations in embedded systems
(Data obrony: 2017-01-23) Habuda, Bartłomiej
Wydział Elektrotechniki, Automatyki, Informatyki i Inżynierii Biomedycznej
Access status: Restricted ,
Aplikacja do numerycznych modelowań pola magnetotellurycznego dla niejednorodnych ośrodków dwuwymiarowych
(Data obrony: 2010-12-21) Szkadłubowicz, Michał
Wydział Geologii, Geofizyki i Ochrony Środowiska
Pierwszy rozdział pracy zawiera definicję oraz opis pojęć związanych z metodami magnetotellurycznymi. Rozdział drugi opisuje podstawy teoretyczne pola magnetotellurycznego. Rozdział trzeci opisuje metodę numeryczną wykorzystaną w aplikacji. W rozdziale czwartym znajdują się informacje o wykorzystanym środowisku programistycznym. Rozdział piąty przedstawia możliwe do wyliczenia w programie modele geoelektryczne. W rozdziale szóstym opisana została aplikacja do modelowania pola magnetotellurycznego. Rozdział siódmy zawiera przykładowe obliczenia. W rozdziale ósmym przedstawione zostały wnioski z przeprowadzonych obliczeń.
Access status: Open Access ,
Characteristic sky background features around galaxy mergers
(Wydawnictwa AGH, 2025) Suelves, Luis E.; Pearson, William J.; Pollo, Agnieszka
In the context of finding galaxy mergers in large-scale surveys, we applied machine-learning algorithms that made use of flux measurements instead of using images (as is the current standard). By training multiple NNs using the Sloan Digital Sky Survey class-balanced data set of mergers and non-mergers, we found that sky-background error parameters could provide a validation accuracy of 92.64 ± 0.15% and a training accuracy of 92.36 ± 0.21%. Moreover, analyzing the NN identifications led us to find that a simple decision diagram using the sky error for two flux filters was enough to gain a 91.59% accuracy. By understanding how the galaxies vary along the diagram and trying to parametrize the methodology in the deeper images of the Hyper Suprime Cam, we are currently trying to define and generalize this sky error-based methodology.
Computer Methods in Materials Science
AGH University Press (2020-)
ISSN: 2720-4081 e-ISSN: 2720-3948
Access status: Open Access ,
Energetyka jądrowa i radioanalityka
(Wydawnictwa AGH, 2025) Cetnar, Jerzy; Fornalik-Wajs, Elżbieta; Gurgul, Sebastian; Jędrzejek, Filip; Kawalec, Anna; Kopeć, Mariusz; Kwapisz, Elżbieta; Lipka, Bogdan; Łaszyńska, Ewa; Oettingen, Mikołaj; Pieńkowski, Ludwik; Szarłowicz, Katarzyna; Zbroja, Katarzyna
The article introduces a comprehensive approach to the application of radionuclides concerning environmental protection and nuclear energy, while also addressing the principles involved in the preparation and utilization of dosimetric instruments within radiological protection frameworks. The discussion encompasses both natural and artificial radioisotoes in the realm of environmen¬tal monitoring and explores methodologies for uranium recovery from waste products. The focus extends to the pivotal integration of radiochemical techniques and numerical methods in nutrient systems, particularly in the context of thorium fuel, energy supply, and the implications of construction materials for nuclear fusion. A numerical investigation of the HTR reactor is conducted, provi¬ding insights on neutron parameters, fuel dynamics, and the tra¬jectory of potential PLOFA risks. Additionally, in the examination of modular solutions (SMR) available for ongoing implementation, the identification of health, financial, and locational challenges is delineated.
Access status: Open Access ,
Model numeryczny odwodnienia złoża węgla brunatnego Złoczew
(Wydawnictwa AGH, 2011) Strzelecki, Tomasz; Strzelecki, Michał
The paper presents the results of numerical calculations of draining the Złoczew lignite deposit with finite element method. The paper is a part of pre feasibility study report. The numerical model was made using FlexPDE v 6 soft. At calculation of the model a previously performed analysis of hydrogeological and geological conditions containing among others of supplying water, proposals of the way of draining and carrying underground waters.
Access status: Open Access ,
Possibilities of applying the extended eyring rheological model in the technology of cement slurries used in oil drilling
(Wydawnictwa AGH, 2024) Skrzypaszek, Krzysztof
This study explores the feasibility of implementing an extended Eyring rheological model to describe the dependence between shear stress and shear rate in cement slurries used in drilling technologies. Advances in cement slurry technology have rendered traditional mathematical models, particularly the widely used linear Bingham model recommended by the API RP 13D (American Petroleum Institute Recommended Practice 13D) standard, insufficient for accurately predicting flow resistance during pumping operations. A misalignment between the model and the actual behavior of cement slurries can result in significant errors, potentially increasing operational costs. By identifying and applying the relevant rheological model, it is possible to optimize the system’s performance, minimizing total pressure losses and thereby reducing overall drilling costs. This paper investigates the applicability of more sophisticated three-parameter rheological models, commonly utilized in other engineering disciplines, to address these challenges. Specifically, the extended Eyring model was adapted to the proprietary RheoSolution methodology developed by the Department of Drilling, Oil and Gas. To validate this approach, a series of laboratory tests were conducted on cement slurries widely used in the oil industry. The results were analyzed and compared against mathematical models recommended by the API standard. The findings confirm that the extended Eyring model offers superior accuracy in determining the rheological parameters of cement slurries for drilling applications, underscoring its potential as a robust tool for improving the efficiency of drilling operations.
Access status: Open Access ,
Przestrzenna analiza stateczności składowiska odpadów komunalnych Zoniówka II
(Wydawnictwa AGH, 2011) Cała, Marek; Adamczyk, Justyna; Kowalski, Michał
This paper shows the 3D slope stability analysis for municipal waste disposal Zoniówka II (quarters I and II) with numerical methods. The conditions of landslide were simulated for the quarter I. The theoretical situations were also analysed. It was assumed that retaining embankment was built from plastic or semi-solid consistency soil. The quarter 1 was also analysed assuming it's fully filled with wastes. The calculations results show, that main reason of landslide was improper soil material of retaining embankment. Further simulations proved that retaining embankment from plastic or semi-solid soil would approve waste disposal stability. The appropriate way of waste disposal is decreasing of moisture content of retaining embankment soil. Stability analysis for quarter II showed considerable different results between 2D and 3D calculations. These differences are the effect of higher precision of 3D modelling what gives a better opportunity to precisely reproduce the slope geology. This also gives a good chance to study the slope failure indicators. The 3D stability analyses of waste disposal allow investigation the progress of failure surface, its shape and range and also the volume of landslide. The accurate 3D geology model shows the influence of properties change on the calculations results. 3D calculations are however more laborious and require more powerful computers.
Access status: Open Access ,
Trójwymiarowa analiza stateczności zbocza w skomplikowanych warunkach geologicznych
(Wydawnictwa AGH, 2010) Cała, Marek; Betlej, Michał
His paper show the method of stability analysis of complex geology slopes. Application of two-dimensional calculations (assuming plane strain conditions) is not always correct for complex geology slopes. Only the three-dimensional numerical calculations allow accurate and sensible stability analysis taking under consideration complex geology and structural surfaces localization. This work deals with three-dimensional stability analysis of complex geology slope. The factor of safety was estimated to fit for real landslide range. Presented method of calculation may be utilized for calibration and validation of three-dimensional numerical models and its application for slopes of similar geology.