Publikacje (OA)

Permanent URI for this collectionhttps://repo.agh.edu.pl/handle/AGH/102728

Publikacje z afiliacją AGH: artykuły, książki, rozdziały książek, preprinty, postprinty, publikacje powstałe m.in. w ramach projektów badawczych, a wydane poza AGH.

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Access status: Open Access ,
An adaptive framework for mobile robot navigation
(2017) Güzel, Mehmet Serdar; Kara, Mehmet; Beyazkılıç, Mehmet Sıtkı
Collective behaviours observed in nature bring new methodologies in proposing control algorithms for robot groups to perform a variety of complex tasks. In this article, an adaptive algorithm, allowing the safe navigation of a group of robots in a collective manner, is proposed. The algorithm, inspired from the adaptive particle swarm optimization technique, proposes an efficient control approach to overcome both static and moving obstacles. Accordingly, compared to the conventional particle swarm optimization algorithm, the proposed system allows a robot or group of robots (swarm) to complete the goal while avoiding static and moving obstacles as well as dynamic targets in a safe and collective manner. The simulation results verify the overall performance and reliability of the proposed system.
Access status: Open Access ,
Dary – przyjąć czy nie przyjąć? Polityka gromadzenia darów w Bibliotece Głównej Akademii Górniczo-Hutniczej im. Stanisława Staszica w Krakowie
(Stowarzyszenie EBIB, 2019) Urbaniec, Marta
Biblioteka Główna
Access status: Open Access ,
Groby profesorów AGH : Cmentarz Rakowicki
(Stowarzyszenie Wychowanków Akademii Górniczo-Hutniczej im. Stanisława Staszica w Krakowie, 2019) Sieński, Hieronim
Biblioteka Główna
Access status: Open Access ,
Biblioteki świata w Bibliotece Głównej AGH – współpraca bibliotekarzy BG AGH i stypendystów UNESCO
(Stowarzyszenie EBIB, 2019) Szuman, Monika
Biblioteka Główna
Access status: Open Access ,
„Biblioteki uczelniane wobec środowiska akademickiego” – sprawozdanie z konferencji
(Stowarzyszenie EBIB, 2019) Imiołek-Stachura, Karolina; Stanek-Kapcia, Justyna
Biblioteka Główna
Access status: Open Access ,
Biomass thermochemical conversion via pyrolysis with integrated CO2 capture
(2020) Sieradzka, Małgorzata; Gao, Ningbo; Quan, Cui; Mlonka-Mędrala, Agata; Magdziarz, Aneta
Wydział Inżynierii Metali i Informatyki Przemysłowej
The presented work is focused on biomass thermochemical conversion with integrated $CO_{2}$ capture. The main aim of this study was the in-depth investigation of the impact of pyrolysis temperature (500, 600 and 700 °C) and $CaO$ sorbent addition on the chemical and physical properties of obtained char and syngas. Under the effect of the pyrolysis temperature, the properties of biomass chars were gradually changed, and this was confirmed by examination using thermal analysis, scanning electron microscopy, X-ray diffraction, and porosimetry methods. The chars were characterised by a noticeable carbon content (two times at 700 °C) resulting in a lower O/C ratio. The calculated combustion indexes indicated the better combustible properties of chars. In addition, structural morphology changes were observed. However, the increasing pyrolysis temperature resulted in changes of solid products; the differences of char properties were not significant in the range of 500 to 700 °C. Syngas was analysed using a gas chromatograph. The following main components were identified: $CO$, $CO_{2}$, $CH_{4}$, $H_{2}$ and $C_{2}H_{4}$, $C_{2}H_{6}$, $C_{3}H_{6}$, $C_{3}H_{8}$. A significant impact of $CaO$ on $CO_{2}$ adsorption was found. The concentration of $CO_{2}$ in syngas decreased with increased temperature, and the highest decrease occurred in the presence of $CaO$ from above 60% to below 30% at 600 °C.
Access status: Open Access ,
Groby profesorów AGH : Cmentarz Rakowicki
(Stowarzyszenie Wychowanków Akademii Górniczo-Hutniczej im. Stanisława Staszica w Krakowie, 2020) Sieński, Hieronim
Biblioteka Główna
Access status: Open Access ,
Biomass CO2 gasification with CaO looping for syngas production in a fixed-bed reactor
(2020) Gao, Ningbo; Śliz, Maciej; Quan, Cui; Bieniek, Artur; Magdziarz, Aneta
Wydział Inżynierii Metali i Informatyki Przemysłowej
The most important challenge in solid feedstock thermal conversion methods is minimising $CO_{2}$ emissions. In this work, the gasification of pine sawdust in a mixture of $N_{2}$ and $CO_{2}$ was investigated for the reduction of $CO_{2}$ by a calcium oxide loop. The experiments were conducted at 600, 700, and 800 °C in a fixed-bed reactor. The biomass was mixed with the calcium oxide at a ratio of 1:1. The chemical composition of the syngas was analysed using gas chromatography. Moreover, the high heating values of the received gas samples were calculated, and thermogravimetric analysis and Fourier-transform infrared spectroscopy analysis were performed to investigate the absorption of $CO_{2}$ by $CaO$. The results of the gasification process showed that the syngas contained $CO$, $CH_{4}$, $CO_{2}$, $H_{2}$, $N_{2}$, and other low hydrocarbons. The most significant results were obtained for a 2:1 ratio of $N_{2}$ to $CO_{2}$ at 700 °C, and a $CO_{2}$ reduction of 25% was observed. Moreover, the catalytic properties of $CaO$ increased the concentration of $H_{2}$ in the produced syngas by up to 10%. A temperature of 800 °C was too high for the carbonation reaction of $CaO$. This study presents a possible solution for achieving negative carbon emissions.
Access status: Open Access ,
Pyrolysis of agricultural waste biomass towards production of gas fuel and high-quality char. Experimental and numerical investigations
(2021) Mlonka-Mędrala, Agata; Evangelopoulos, Panagiotis; Sieradzka, Małgorzata; Zajemska, Monika; Magdziarz, Aneta
Wydział Inżynierii Metali i Informatyki Przemysłowej
Biomass wastes are sustainable, renewable, and promising energy sources. In this study, the pyrolysis of agricultural biomass was investigated to determine the most promising process parameters for pyrolytic gas production. The pyrolysis investigations were carried out under nitrogen atmosphere at 300, 400, 500, and 600 °C on the microscale using simultaneous thermal analysis and a laboratory-scale semi-batch vertical reactor. The solid, liquid, and gaseous products were characterised in detail, including the elemental and chemical composition. The gas and liquid products analyses were provided. It was found that the quality of the pyrolytic gas increased with temperature, both in terms of the pyrolytic gas yield and concentration of gaseous components (hydrogen and methane), whereas the carbon dioxide concentration decreased with temperature. The condensed vapours were rich in phenolic and aromatic compounds, and it was noted that the acetic acid concentration increased with temperature. The chemical functional groups in the char were determined using infrared spectroscopy. The carbon content increased with temperature, whereas the hydrogen content decreased. Further decomposition of the organic matrix was observed with increasing temperature. Additionally, chemical modelling of pyrolytic gas was performed using Ansys Chemkin-Pro software and compared with the experimental results. The computational results showed a good correlation with the measured pyrolytic gas composition, especially in the case of the major gas components.
Access status: Open Access ,
Multifaceted analysis of products from the intermediate co-pyrolysis of biomass with Tetra Pak waste
(2021) Jerzak, Wojciech; Bieniek, Artur; Magdziarz, Aneta
Wydział Inżynierii Metali i Informatyki Przemysłowej
This study investigates the co-pyrolysis of two types of biomass (pine bark and wheat straw) with Tetra Pak waste (TPW). The experiments were performed using a fixed-bed reactor equipped with an innovative system, where a sample was rapidly heated to 600 °C before being rapidly cooled. The multifaceted analysis included the determination of the i) physical and chemical properties of the feedstocks and chars, ii) aqueous phase, tars, and waxes, iii) char ignition and burnout temperature, iv) chemical composition of gas, and v) distribution of carbon and hydrogen in the obtained products. The results showed that the addition of TPW to the both types of biomass significantly reduced the char mass and aqueous phase, decreased the carbon, hydrogen, and nitrogen contents of the char, and increased the wax and tar yields retained in the water cooler. Different organic compounds such as alkenes, aromatic hydrocarbons, and acids were found in tars and waxes. The chemical composition of the released gases was detected in situ (by a flue-gas analyser) and ex-situ (using gas chromatography). Changes in the concentrations of $H_{2}$, $CH_{4}$, $CO$, $CO_{2}$, and C2–C4 were observed. The addition of Tetra Pak to the two types of biomass had an evident and positive effect on the hydrogen content of the pyrolysis gas.
Access status: Open Access ,
Microstructure study of fractured polar bear hair for toughening, strengthening, stiffening designs via energy dissipation and crack deflection mechanisms in materials
(2021) Stachewicz, Urszula
Wydział Inżynierii Metali i Informatyki Przemysłowej
Polar bear hair is known for its superior thermal insulation properties protecting from frigid water and freezing weather conditions. However, this microscopy study on polar bear hair is related to the investigation of the crack stopping mechanisms within its structure following the toughening mechanism principle used by nature. The inhomogeneous structure of polar bear hair consists of fiber bundles, tubules, membranes, porous medulla, and cuticle layers. Precisely, these types of material constructions help impact energy dissipation to protect materials before the failure and save animals via its multifunctionality. The multiscale structures are the key to adopting different physical properties in distinct sizes, from thermal insulation to the toughening, strengthening, and stiffening mechanisms in material designs.
Access status: Open Access ,
W cieniu Akademii Sztuk Pięknych : od Oddziału Przemysłu Artystycznego Państwowej Szkoły Przemysłowej do Państwowej Szkoły Przemysłu Artystycznego w Krakowie (1891-1921)
(Małopolski Związek Regionalnych Towarzystw Kultury, 2021) Krawczyk, Jerzy
Biblioteka Główna
W pracy omówiono kształcenie w latach 1891–1921 artystów-rzemieślników w oddziale (wydziale) przemysłu artystycznego przy Państwowej Szkole Przemysłowej w Krakowie. Przedstawiono programy nauczania, nakreślono sylwetki nauczycieli zawodu oraz najwybitniejszych absolwentów. Na bazie oddziału w okresie międzywojennym powstała średnia Państwowa Szkoła Przemysłu Artystycznego, którą – po kilkukrotnej zmianie nazwy – ostatecznie po II wojnie światowej włączono w struktury Akademii Sztuk Pięknych.
Access status: Open Access ,
Groby rektorów Akademii Górniczej i Akademii Górniczo-Hutniczej
(Stowarzyszenie Wychowanków Akademii Górniczo-Hutniczej im. Stanisława Staszica w Krakowie, 2021) Sieński, Hieronim
Access status: Open Access ,
Transition metal sulfides for electrochemical applications: Controlled chemical conversion of CuS to Ag2S
(2022) Mazurków, Julia; Kusior, Anna; Mikuła, Andrzej; Radecka, Marta
Wydział Inżynierii Materiałowej i Ceramiki
Transition metal sulfides have received great attention as electrocatalysts for electrochemical sensors and water electrolysis. In the present study, a facile and rapid chemical conversion route was used for the synthesis of partially and fully converted $Ag_{2}S$ from tube-like CuS. The morphology of the obtained materials was investigated by scanning electron microscopy (SEM) and transition electron microscopy (TEM), revealing that the complex shape of CuS was maintained after the conversion. Information about phase and elemental composition was obtained by X-ray diffraction (XRD), Raman spectroscopy, X-ray fluorescence spectrometry (XRF), and inductively coupled plasma optical emission spectrometry (ICP-OES). The surface composition was analyzed utilizing X-ray photoelectron spectroscopy (XPS). The results indicated that it was possible to precisely control the contribution of each sulfide by varying precursors ratio. Moreover, the conducted experiments enabled to schematically illustrate the $CuS-Ag_{2}S$ junction and propose a conversion mechanism. The electrochemical behavior of the materials was examined using cyclic voltammetry (CV) in the potential range of biomolecules electrooxidation as well as water splitting. Special attention was devoted to reactions occurring on $Ag_{2}S$-modified electrodes in alkaline and neutral media. It was found that the formation of subsequent oxides, their reduction, and the recovery of $Ag_{2}S$ are diffusion-controlled processes.
Access status: Open Access ,
Escape Room with a touch of chamber LARP as a creative form of library promotion – a case study
(Uniwersytet Gdański, 2022) Imiołek-Stachura, Karolina; Łapucha, Paweł
Biblioteka Główna
On the occasion of the 100th anniversary of the AGH-UST Main Library, a number of activities were organized as a part of the open days to attract the attention of the academic community. One of the main events was an Escape Room game organized as a chamber LARP to remind and show in an unusual way, according to the principles of gamification, how necessary and important the Library is.
Access status: Open Access ,
Experiments and analysis of the limit stresses of a magnetorheological fluid
(2022) Horak, Wojciech; Stępień, Barbara Iwona; Sapiński, Bogdan
Wydział Inżynierii Mechanicznej i Robotyki
This paper presents the results of a rheological test of a commercial magnetorheological (MR) fluid (MRF-132DG). The research includes the problem of measuring and interpreting limit stresses under conditions close to the magnetic saturation of the fluid. Four different limit stresses were determined, two related to the yield point and two related to the flow point. Methods for determining limit stresses, especially due to excitation conditions, were also analysed. The aim of this study is to determine the effect of selected parameters on the values of limit stresses of the selected MR fluid. An additional objective is to highlight the problems of defining and interpreting individual limit stresses in MR fluids, particularly in the context of selecting the values of these stresses for the purpose of modeling systems with MR fluids.
Access status: Open Access ,
Smart textiles and the indoor environment of buildings
(2022) Priniotakis, Georgios; Stachewicz, Urszula; van Hoof, Joost
Wydział Inżynierii Metali i Informatyki Przemysłowej
Access status: Open Access ,
Magnesium-Doped Sr2(Fe,Mo)O6−δ Double Perovskites with Excellent Redox Stability as Stable Electrode Materials for Symmetrical Solid Oxide Fuel Cells
(2022) Zheng, Kun; Lach, Jakub; Zhao, Hailei; Huang, Xiubing; Qi, Kezhen
Wydział Energetyki i Paliw
In this work, magnesium-doped $Sr_{2}Fe_{1.2}Mg_{0.2}Mo_{0.6}O_{6−δ}$ and $Sr_{2}Fe_{0.9}Mg_{0.4}Mo_{0.7}O_{6−δ}$ double perovskites with excellent redox stability have been successfully obtained. The physicochemical properties including: crystal structure properties, redox stability, thermal expansion properties in oxidizing and reducing conditions, oxygen content as a function of temperature and transport properties, as well as the chemical compatibility with typical electrolytes have been systematically investigated. The in situ oxidation of reduced samples using high-temperature XRD studies shows the crystal structure of materials stable at up to a high-temperature range. The in situ reduction and oxidation of sinters with dilatometer measurements prove the excellent redox stability of materials, with the thermal expansion coefficients measured comparable with electrolytes. The oxygen nonstoichiometry δ of compounds was determined and recorded in air and argon up to 900 °C. $Sr_{2}Fe_{1.2}Mg_{0.2}Mo_{0.6}O_{6−δ}$ oxide presents satisfactory values of electrical conductivity in air ($56.2 \ S·cm^{−1}$ at 600 °C) and reducing conditions ($10.3 \ S·cm^{−1}$ at 800 °C), relatively high coefficients D and k, and good ionic conductivity (cal. $0.005 \ S·cm^{−1}$ at 800 °C). The stability studies show that both compounds are compatible with $Ce_{0.8}Gd_{0.2}O_{1.9}$ but react with the $La_{0.8}Sr_{0.2}Ga_{0.8}Mg_{0.2}O_{3−d}$ electrolyte. Therefore, the magnesium-doped double perovskites with excellent redox stability can be potentially qualified as electrode materials for symmetrical SOFCs and are of great interest for further investigations.
Access status: Open Access ,
Tailoring the Stability of Ti-Doped Sr2Fe1.4TixMo0.6−xO6−δ Electrode Materials for Solid Oxide Fuel Cells
(2022) Zheng, Kun; Albrycht, Maciej; Chen, Min; Qi, Kezhen; Czaja, Paweł
Wydział Energetyki i Paliw
In this work, the stability of $Sr_{2}(FeMo)O_{6−δ}$-type perovskites was tailored by the substitution of Mo with Ti. Redox stable $Sr_{2}Fe_{1.4}Ti_{x}Mo_{0.6−x}O_{6−δ}$ (x = 0.1, 0.2 and 0.3) perovskites were successfully obtained and evaluated as potential electrode materials for SOFCs. The crystal structure as a function of temperature, microstructure, redox stability, and thermal expansion properties in reducing and oxidizing atmospheres, oxygen content change, and transport properties in air and reducing conditions, as well as chemical stability and compatibility towards typical electrolytes have been systematically studied. All $Sr_{2}Fe_{1.4}Ti_{x}Mo_{0.6−x}O_{6−δ}$ compounds exhibit a regular crystal structure with Pm-3m space group, showing excellent stability in oxidizing and reducing conditions. The increase of Ti-doping content in materials increases the thermal expansion coefficient (TEC), oxygen content change, and electrical conductivity in air, while it decreases the conductivity in reducing condition. All three materials are stable and compatible with studied electrolytes. Interestingly, redox stable $Sr_{2}Fe_{1.4}Ti_{0.1}Mo_{0.5}O_{6−δ}$, possessing 1 μm grain size, low TEC $(15.3 \ × \ 10^{−6} \ K^{−1})$, large oxygen content change of $0.72 \ mol·mol^{−1}$ between 30 and 900 °C, satisfactory conductivity of $4.1–7.3 \ S·cm^{−1}$ in $5\% \ H_{2}$ at 600–800 °C, and good transport coefficients D and k, could be considered as a potential anode material for SOFCs, and are thus of great interest for further studies.
Access status: Open Access ,
Recent advances in low-gradient combustion modelling of hydrogen fuel blends
(2022) Buczyński, Rafał; Uryga-Bugajska, Ilona; Tokarski, Mieszko
Wydział Energetyki i Paliw
Low-gradient combustion (LGC) proved to be an effective alternative technology to reduce pollutant emissions and carbon footprint, specifically when combined with hydrogen as a fuel or blend component. This novel technology offers several advantages over conventional combustion regimes, including a more effective control of emissions and providing greater flexibility in fuel application. The impact of hydrogen on this regime is still not well-known, especially when it comes to the combustion of pure hydrogen and fuels with a high hydrogen content. In the last two decades, numerical simulations have become a powerful tool that facilitates the research and design of LGC, particularly in terms of stability of the process and the emission of pollutants. This article provides an up-to-date review of recent trends and theoretical knowledge in low-gradient combustion. This includes the guidelines and recommendations applied to LGC modelling. Comparisons have been made between the recently published modelling approaches presented by the authors, including a detailed assessment of the discrepancies in the temperature predictions. The challenges and limitations associated with the LGC combustion modelling of conventional fuels (i.e., natural gas, methane, syngas) blended with hydrogen are also discussed. The review demonstrated that the Eddy Dissipation Concept (EDC) is the most common turbulent chemical interaction model employed in LGC combustion simulations. The performance of the EDC can be significantly improved by variable constants $C_{𝛾}$ and $C_{𝜏}$ based on local turbulent Reynolds and Damköhler numbers. However, the most recent publications indicate that the flamelet-based approach can be considered as a promising (and more cost-effective) alternative to the EDC. Furthermore, the chemical kinetic studies considered in this review confirm that there is no detailed reaction mechanism capable of accurately predicting the temperature profile along with the emissions of the main species of interest, i.e., NOx, CO, CO2, and OH. Although GRI-Mech 2.11 is the most widely used mechanism in LGC simulations, providing satisfactory overall accuracy.