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Publications Repository
Gdańsk University of Technology

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Publications from the year 2025

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  • Valorization of waste plastics to a novel metal-organic framework derived cobalt/carbon nanocatalyst as peroxymonosulfate activator for antibiotics degradation
    • Chongqing Wang
    • Xiuxiu Zhang
    • Luyao Wang
    • Gonggang Liu
    • Grzegorz Boczkaj
    2025 JOURNAL OF CLEANER PRODUCTION

    Metal-organic frameworks (MOFs), with excellent structural properties, exhibit unique advantages as promising catalysts in the degradation of emerging organic contaminants (EOCs) by PS-AOPs. Herein, Co-MOF-71 was prepared by hydrothermal method using terephthalic acid (TPA) obtained from the hydrolysis of waste PET plastics as an organic ligand, and the derived cobalt/carbon composite (PETC) was prepared by carbonizing Co-MOF-71 under N2 atmosphere. Characterizations revealed that PETC800 carbonized at 800 °C possessed a loose and porous layered morphology with a surface area of 148 cm2/g, and had a porous structure rich in active sites that are effective in peroxymonosulfate (PMS) activation and tetracycline (TC) degradation. Degradation experiments revealed that the maximum degradation rate of TC by PETC800 could reach 90.94% within 20 min, with a maximum rate constant of 0.2700 min−1 and activation energy of 19.50 kJ/mol, which was lower than that of previous reports. Additional studies confirmed high effectiveness also towards other pharmaceuticals degradation such as metronidazole, levofloxacin and doxorubicin. More importantly, PETC800 could degrade TC efficiently in a broad pH region (3.0–9.0). The degradation performance of TC could be 72.18% after four cycles, demonstrating good reusability. Both radical (•OH, SO4•−, and O2•−) and nonradical pathways (singlet oxygen (1O2) and electron transfer) contributed to the TC degradation process, with the non-radical pathway dominating. LC-MS and toxicity analyses have postulated the degradation of TC into intermediates with lower levels of toxicity. The preparation of MOFs-derived catalysts from waste plastics allows resourceful utilization of waste plastics as well as enhances the catalytic performance of MOFs-derived cobalt/carbon-based catalysis for efficient degradation of emerging organic contaminants.

  • Vehicle Type Recognition Based on Audio Data
    • Dariusz Kobiela
    • Michał Hajdasz
    • Mateusz Erezman
    • Karolina Nurzyńska
    • Szymon Zaporowski
    • Adam Kurowski
    • Paweł Weichbroth
    2025 Full text

    Identifying different vehicle types can help manage traffic more efficiently, reduce congestion, and improve public safety. This study aims to create a classification model that can recognize vehicle types based on the sound of passing vehicles. To achieve this, a database of raw audio files containing 1763 samples from two sources was assembled. The time-domain signals were converted to a time-frequency representation using the short-time Fourier transform to generate Mel Spectrograms. Mel-frequency Cepstral Coefficients (MFCCs) were also generated using the discrete cosine transform. In our experiments we compared these approaches. Since the data was imbalanced we applied online augmentation. Based on the literature review, we chose a Convolutional Neural Network (CNN) classifier because it is particularly well suited for analyzing large datasets due to its automatic feature extraction, parameter sharing and sparsity. The results showed that Mel Spectrograms were more effective for audio data preprocessing in this particular use case, achieving the highest accuracy of 0.875 and the highest f1-score of 0.877 compared to MFCCs.

  • View Quality Assessments: A Pilot Study of Field Methods
    • Barbara Matusiak
    • Mandana Sarey Khanie
    • Claudia Moscoso
    • Anna María Pálsdóttir
    • Siegrun Appelt
    • Christina Hemauer
    • Klaus Martiny
    • Kamilla Woznicka Miskowiak
    • Ida Astrid Lindegaard
    • Alexander Tobias Ysbæk-Nielsen
    • Carlo Volf
    • Natalia Sokół
    2025 Full text LEUKOS

    This paper describes findings from a workshop during which participants evaluated a series of windowviews. An explorative approach was applied to identify issues and testing methods useful in daylightresearch. The participants visited nine rooms with views of varied content, complexity, and viewingdistance under the overcast sky. Participants used surveys with quantitative and qualitative questions,hand drawings, illuminance measurements, and photography to appraise the view quality.Subsequently, daylight simulations and neurocognitive tests have been carried out in two rooms with“bad” and “good” views. Multi-directional views were valued more than narrow or single-directionalviews. The cognitive testing showed numerical differences in several measures and a significant correla-tion between the difference scores for sadness and the difference scores for Trail Making Test-B acrosstwo rooms. The study identified that buildings of historical value, a presence of greenery, coloredbuilding facades, or a presence of people (content) contribute to a positive assessment of the view but are not included in the assessment criteria.

  • Vitamin B9 as a new eco-friendly corrosion inhibitor for copper in 3.5% NaCl solution
    • Hubert Kwiatkowski
    • Stefan Krakowiak
    • Łukasz Gaweł
    2025 Full text JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY

    Folic acid salt (sodium folate) was studied as an eco-friendly and non-toxic copper corrosion inhibitor in 3.5% NaCl solution. Electrochemical impedance spectroscopy, polarization resistance and weight-loss measurements show that the inhibitor efficiency increases with concentration (the highest value- approx. 96% was reported for the solution containing 16 mM sodium folate after 24 h). EIS data and Tafel plots indicate that sodium folate is a barrier, mixed-type (with predominant cathodic character) inhibitor. Inhibitor efficiency decreases with temperature, which suggests that adsorption has physical character rather than chemical one - adsorption free energy calculated using the Langmuir model is consistent with this statement. Activation energy determined from the Arrhenius plot increases as a result of inhibitor presence. Efficiency of the inhibitor increases systematically during the first 12 hours of immersion. Potential chemical changes in sodium folate solution were investigated using UV-VIS spectroscopy. Furthermore, copper surface after immersion in the presence and absence of inhibitor was characterized with scanning electron microscopy, energy-dispersive X-Ray spectroscopy and microscopic photographs.

  • Voltage Control of a Stand-Alone Multiphase Doubly Fed Induction Generator
    • Krzysztof Blecharz
    • Marcin Morawiec
    • Roland Ryndzionek
    • Michał Michna
    2025 IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS

    This article presents a multiphase doubly fed induction generator (MDFIG) with a dedicated and unique control algorithm in a stand-alone wind energy conversion system. The algorithm has been developed and elaborated in the case of different emergency modes. Compared with the traditional double-fed induction generator, the MDFIG has increased reliability, reduced current level per phase, and low rotor harmonic currents. The control system is based on a classical mathematical model and the stator field-oriented control method. However, especially for the wind turbine system, the control system has been extended for dedicated five-phase operation and additional scenarios have been added. First, the dynamic states of the generator operation under normal operating conditions with voltage variation and load were simulated and compared with laboratory tests. Second, the fault-tolerance results of rotor phase failures with different states and loads were presented. This performance is validated in the laboratory with a 4 kW prototype MDFIG. The method presented in this article is simple, robust, and cost effective with MDFIG and has significantly improved the reliability of the power generation system.

  • Warunki kinematyczne obróbki powierzchni płaskich i walcowych na docierarkach tarczowych
    • Adam Barylski
    2025 Kwartalnik Naukowo-Techniczny "Obróbka Metalu"

    Przedstawiono kinematykę docierania elementów maszynowych na docierarkach tarczowych. Analizowano docieranie powierzchni płaskich, płasko-równoległych i walcowych. Analizowano wpływ położenia przedmiotu docieranego w separatorze na zmienność prędkości docierania. Przedstawiono wpływ prędkości obrotowej tarczy docierającej na wartość prędkości docierania oraz analizowano prędkość średnią w czasie cyklu ruchu w układzie wykonawczym docierarki. Scharakteryzowano przykładowe docierarki dwutarczowe i do obróbki wałków.

  • Waste tire rubber with low and high devulcanization level prepared in the planetary extruder
    • Agata Rodak
    • Józef Haponiuk
    • Shifeng Wang
    • Krzysztof Formela
    2025 Sustainable Materials and Technologies

    Waste tires management is serious and global environmental problem. Therefore, searching for new andindustrially applicable solutions to convert waste tire rubber into high-value added products is gaining more andmore attention. Rubber devulcanization is step forward for further developing rubber recycling and upcyclingtechnologies. Thermo-mechanical treatment of ground tire rubber (GTR) performed in twin screw extruders iscurrently the most popular solution, while literature information about alternative continuous methods are verylimited. In this field of research, using of planetary extruders as multi-screw reactors seems to be interestingsolution, which is due to their high mixing efficiency, good heat exchange and devolatilization capacity.In this work, thermo-mechanical treatment of GTR was performed in a lab-scale planetary extruder. Devulcanization effectiveness has been investigated by extruder torque monitoring, Mooney viscosity, swelling measurements, Horikx theory, Fourier transform infrared spectroscopy, scanning electron microscopy,thermogravimetry, curing characteristics and tensile tests. Volatile organic compounds emitted from untreatedwaste tire rubber and reclaimed rubbers were determined using a gas chromatography combined with flameionization detector or mass spectrometry. The results showed that GTR devulcanization efficiency and emissionlevels of volatile organic compounds increased with higher temperature during planetary extrusion. Mooneyviscosity and tensile properties of GTR treated using a planetary extruder were comparable to the commerciallyavailable reclaimed rubbers. This work confirms that waste tire rubber devulcanization in the planetary extruderis a promising approach for further studies towards sustainable development of rubber recycling technologiesand circular economy.

  • Wave dispersion relations in peridynamics: Influence of kernels and similarities to nonlocal elasticity theories
    • Victor Eremeev
    • Konstantin Naumenko
    2025 Full text INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE

    We investigate the wave dispersion relations of an infinite elastic bar within the framework of linear bond-based peridynamics. This nonlocal integral-type model accounts for long-range interactions, which become significant at small scales and in cases of damage and fracture. Since a key element of this material model is the kernel function, we derive dispersion curves for several kernel choices. Notably, for non-singular kernels, we observe negative group velocities, indicating that peridynamics can describe materials with anomalous dispersion. By comparing one-dimensional (1D) peridynamics with the 1D nonlocal elasticity of Eringen’s type, we highlight similarities between the two models in terms of dispersion behavior.

  • Wideband High Efficiency Slot Array Antenna Based on Gap Waveguide Single-Layer Feeding Network
    • Rahman Askarzadeh
    • Ali Farahbakhsh
    • Davood Zarifi
    • Ashraf Uz Zaman
    2025 IEEE Antennas and Wireless Propagation Letters

    A single-layer, full metal, wideband and high efficiency slot array antenna operating in V-band (50-75 GHz) is proposed using single corporate-feeding network based on gap waveguide (GW) technology. Compared with conventional multi layered slot array antenna, the proposed antenna utilizes only one waveguide feeding layer excites the radiation slots, therefore the assembly complexity of multi-layer waveguide and manufacturing cost is greatly decreased. The proposed 16 × 16 slot array antenna consists of four 64 element smaller array antennas in which all radiation slots are fed by E-plane groove gap waveguide (EGGW). Power division in each of the 8×8 element array antenna is realized by a wideband combined ridge and EGGW power divider. Two wideband E-plane groove gap waveguide T-junctions have been used to connect all four 64 element sub-array antennas with proper phase and equal amplitude together to obtain higher gain. The final 16 × 16 slot array antenna has a peak gain of 32 dBi gain and about 36% impedance bandwidth at V-band. Also, the full metal antenna array has an average efficiency of 80% over the entire bandwidth of 50-72GHz.

  • Wykonanie analizy zawartości i aktywności wody, pH ekstraktu wodnego oraz ocena zawartości błonnika rozpuszczalnego i nierozpuszczalnego.
    • Szymon Mania
    • Adrianna Banach-Kopeć
    • Karol Staszczyk
    2025

    Wykonanie analizy zawartości i aktywności wody, pH ekstraktu wodnego oraz ocena zawartości błonnika rozpuszczalnego i nierozpuszczalnego.

  • Zastosowanie fotogrametrii do tworzenia replik w obiektach zabytkowych
    • Anna Banaś
    • Maciej Niedostatkiewicz
    • Jacek Bramorski
    2025 Full text Inżynieria i Budownictwo

    Podczas użytkowania zabytków nieruchomych, którymi bardzo często są obiekty sakralne, nierzadko zachodzi konieczność stworzenia, znajdującego się wewnątrz obiektu, kopii oryginalnego elementu, w tym również będącego zabytkiem ruchomym. Realizacja wiernej kopii użytkowej, niezależnie od przyczyn konieczności jej wykonania, wymaga zastosowania techniki umożliwiającej stworzenie samej repliki. Kluczowymi wymaganiami dla techniki tworzenia replik zabytków ruchomych są szybkość ich wykonania, wysoka jakość oraz niski koszt realizacji. Istotnym zagadnieniem jest również uniwersalność samej metody, jak również jej dostępność oraz łatwość jej aplikacji. Wymagania te spełnia technika fotogrametrii, która w połączeniu z drukiem 3D umożliwia tworzenie w szybkim czasie wiernych replik zabytków ruchomych, w tym będących wyposażeniem obiektów sakralnych. Artykuł stanowi studium przypadku, w którym opisano i przedstawiono zastosowanie techniki fotogrametrii do realizacji wiernej kopii rzeźby sakralnej. W pracy omówiono zarówno wady, jak i zalety techniki fotogrametrycznej, określono istotne parametry umożliwiające stworzenie przestrzennego wydruku 3D na podstawie rekonstrukcji grupy standardowych zdjęć dwuwymiarowych.