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Gdańsk University of Technology

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Publications from the year 2024

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  • Virtual tour as an innovative tool for architectural education - from understanding heritage to creativity stimulation
    • Karolina Życzkowska
    • Doria Elisabetta
    • Justyna Borucka
    2024 World Transactions on Engineering and Technology Education

    The article presents the potential of the virtual tour in architectural education as an innovative tool to better understand heritage and stimulate creativity. A methodology for creating a virtual tour based on a point cloud obtained from a survey based on 360° camera images is presented. Two different purposes for the use of point clouds are presented from reliable indicators of heritage documentation useful for digital twin modelling and architectural analysis, to the creation of thematic virtual tours enabling the testing of different scenarios. The article focuses on the case of virtual tours that were created as part of the 2023 Gdańsk Summer School associated with the H2020 PROMETHEUS project, in collaboration between Gdańsk University of Technology (Gdańsk Tech), Poland, and the University of Pavia, Italy. A virtual tour was created for a significant part of the Royal Way in Gdańsk. A comparison of the different types of virtual tours is presented in relation to their objectives (educational, tourist, entertainment), the characteristics of the scenarios (place, time, story, characters) and the experience environment (virtual, augmented or immersive space).

  • Voltage and Current Unbalance Reduction in Power Networks with Distributed Generation and Electric Vehicles
    • Krzysztof Dobrzyński
    • Stanisław Czapp
    2024 Full text ENERGIES

    The current development of prosumer microsources and the expected spread of electric vehicles may cause the appearance of significant current and voltage unbalance in low-voltage (LV) networks. This unbalance, which is an unfavorable phenomenon, may occur when using single-phase photovoltaic (PV) microsources and single-phase home chargers for electric vehicles. This paper presents a proposal for the symmetrization of the LV network using devices for the reconfiguration of phases in the power supply. Both the different locations of these devices and the different objective functions for device implementation are analyzed. The research was carried out on an example LV network, taking into account several variants of the development of PV microsources and home chargers for electric vehicles. The analysis indicates that the appropriate location of phase reconfiguration devices and the use of an appropriate objective function leads to a significant reduction in unfavorable unbalancing in the LV network.

  • Walther H. Nernst - noblista z Wąbrzeźna
    • Adam Barylski
    2024 Przegląd Techniczny

    Przedstawiono życiorys i osiągnięcia naukowe prof. Walthera Hermanna Nernsta, urodzonego 25 czerwca 1864 r. w Wąbrzeźnie, laureata Nagrody Nobla z dziedziny chemii z roku 1921. W. Nernst jest autorem m.in. III zasady termodynamiki oraz konstruktorem tzw. lampy Nernsta. Była to jedna z pierwszych lamp elektrycznych, oświetlająca wieżę Eiffla i pawilon niemiecki na Światowej Wystawie w Paryżu w 1890 r. W roku 1914 zostaje honorowym doktorem politechniki w Gdańsku. W roku 1991 na domu w którym się urodził w Wąbrzeźnie umieszczono tablicę pamiątkową, podobnie jak w roku 2021 na murach szkoły w Grudziądzu, do której uczęszczał. W 120-lecie Politechniki Gdańskiej z uznaniem warto wspomnieć postać profesora, mniej nam znanego niż jego osiągnięcia naukowe.

  • Warstwowa ocena epidemiologiczna architektury zakładów opiekuńczo-leczniczych i zakładów gieriatycznych = Layer based epidemiological quality assessment of architecture of care security and geriatric wards
    • Wacław Szarejko
    • Rafał Janowicz
    2024 MEDYCYNA PRACY

    W artykule opisano możliwość wykorzystania autorskiej metody warstwowej oceny epidemiologicznej (WOE) do oceny potencjalnego ryzyka zakażeń w obiektach przeznaczonych dla osób starszych. Materiał i metody: W celu weryfikacji możliwości użycia metody WOE do oceny zagrożeń w zakresie bezpieczeństwa epidemiologicznego środowiska zbudowanego poddano analizie dostępne źródła literatury związane z obowiązującymi w Polsce wymaganiami prawnymi w zakresie oceny ergonomii obiektów medycznych pod względem transmisji zakażeń. W artykule odniesiono się również do wytycznych Komisji Europejskiej w zakresie Nowego Europejskiego Bauhausu i systemu oceny jakości Davos Baukultur Quality System jako standaryzowanej metody oceny jakości przestrzeni zbudowanej. W pracy przedstawiono podstawowe założenie autorskiej metody WOE pozwalającej na ocenę ryzyka transmisji zakażeń oddzielnie dla poszczególnych grup elementów, z których składa się budynek. Skuteczność metody wykazano poprzez wykorzystanie jej do oceny ryzyka zakażeń na przykładzie pokoju oddziału geriatrycznego. Wyniki: W artykule pokazano możliwość zastosowania narzędzia warstwowej oceny struktury budynku jako skutecznej metody wspomagającej działania ograniczające ryzyko epidemiczne. Wykorzystanie WOE umożliwia czytelne rozróżnienie potencjalnych dróg zakażeń w obrębie analizowanych obiektów i przyporządkowanie ich poszczególnym elementom składowym budynków. Dodatkowo przedstawiona metoda umożliwia zdefiniowanie koniecznych do wykonania procedur i opracowanie schematu działań minimalizujących ryzyko rozprzestrzenienia zakażeń w obrębie analizowanych nieruchomości. Wnioski: Zastosowanie WOE do oceny rozwiązań architektonicznych obiektów przeznaczonych do pobytu osób starszych wiąże się z wieloma korzyściami. Metoda ta może stanowić narzędzie eksperckie pozwalające na szybką i precyzyjną ocenę potencjalnych zagrożeń epidemiologicznych. Ważną zaletą jest także możliwość wykorzystania jej, w sposób odrębny, w przypadku różnorodnych typów zagrożeń epidemiologicznych cechujących się różnymi drogami transmisji zakażeń

  • Water retention curves of sandy soils obtained from direct measurements, particle size distribution, and infiltration experiments
    • Umar Farooq
    • Wioletta Gorczewska-Langner
    • Adam Szymkiewicz
    2024 VADOSE ZONE JOURNAL

    Accurate information about soil water retention curves (SWRCs) of sands is essential for evaluating groundwater recharge and vulnerability to contamination in many shallow sandy aquifers which are widespread on post glacial areas in Northern Europe and North America. Pedotransfer functions (PTFs) allow to estimate SWRC from basic physical characteristics of soils, such as textural composition. However, in the case of clean sands which are dominated by a single textural fraction, PTFs should be based on more detailed information given by the particle size distribution. In this study we evaluated three parametric PTFs, which estimate parameters of the van Genuchten SWRC based on empirical correlations to the parameters of soil particle size distribution, and five semi-physical PTFs, which derive the pore size distribution from particle size distribution. PTFs were compared to SWRCs fitted to the results of drainage experiments on sandy soil samples from six locations in Gdańsk region (northern Poland). Although in all samples the content of silt and clay fractions was low (<3.5%), the differences in actual content of fines strongly influenced the shape of SWRC. In contrast, the amount of gravel fraction (varying from 1% to 35%) did not have significant effect on SWRC. Semi-physical PTFs were found to be more accurate than parametric PTFs. The best overall performance was shown by the semi-physical Chang and Cheng PTF. Among the parametric PTFs the best accuracy was obtained with the Schaap and Bouten method. However, all considered functions showed limited accuracy in higher suction range. Additionally, infiltration experiments were performed on four sites. SWRCs were obtained from ring infiltrometer tests using the Beerkan estimation of soil transfer parameters (BEST) method and from the tension infiltrometer (TI) tests using numerical solution of the inverse problem based on the Richards equation. In almost all cases the wetting SWRCs were characterized by higher values of the pressure scaling parameter α compared to SWRCs measured in drainage experiments, which is consistent with the well-known phenomenon of hysteresis in soils. However, the BEST method resulted in significantly higher α and hydraulic conductivity Ks than TI, probably due to activation of the largest soil pores during ponded infiltration.

  • Wavelet transform analysis reveals differences between patients with impaired LVEF and healthy individuals
    • Marcin Gruszecki
    • Damian Kaufmann
    • Michał Świątczak
    • Krzysztof Młodziński
    • J Neary
    • Jyotpal Singh
    • Jacek Rumiński
    • Ludmiła Danilowicz-szymanowicz
    2024 Full text Kardiologia Polska

    Heart failure (HF) is a global pandemic. It af- fects 64 million people worldwide, with stead- ily increasing incidence, morbidity, mortality, and economic burden [1]. Forecasts indicate continued rising prevalence, especially among the elderly and in low-to-middle socio-de- mographic index regions [2]. Left ventricular ejection fraction (LVEF) significantly impacts HF treatment and prognosis [3]. The sequence of physiological changes related to reduced LVEF remains uncertain, and only limited re- search has explored these mechanisms. This study employed wavelet transformation (WT) to investigate oscillatory interactions, exploring aging and decreased LVEF effects on cardiovascular dynamics. We analyzed central (electrocardiogram [ECG]) and pe- ripheral (blood pressure [BP]) measurements, hypothesizing modified wavelet quantities in HF patients compared to healthy individuals.

  • Weakly Hydrated Solute of Mixed Hydrophobic–Hydrophilic Nature
    • Aneta Panuszko
    • Maciej Śmiechowski
    • Maciej Pieloszczyk
    • Adrian Malinowski
    • Janusz Stangret
    2024 JOURNAL OF PHYSICAL CHEMISTRY B

    Infrared (IR) spectroscopy is a commonly used and invaluable tool in studies of solvation phenomena in aqueous solutions. Concurrently, density functional theory calculations and ab initio molecular dynamics simulations deliver the solvation shell picture at the molecular detail level. The mentioned techniques allowed us to gain insights into the structure and energy of the hydrogen bonding network of water molecules around methylsulfonylmethane (MSM). In the hydration sphere of MSM, there are two types of populations of water molecules: a significant share of water molecules weakly bonded to the sulfone group and a smaller share of water molecules strongly bonded to each other around the methyl groups of MSM. The very weak hydrogen bond of water molecules with the hydrophilic group causes the extended network of water hydrogen bonds to be not "anchored" on the sulfone group, and consequently, the MSM hydration shell is labile.

  • Wet H2S corrosion and degradation of pipeline in amine regeneration system
    • Juliusz Orlikowski
    • Maciej Kalinowski
    • Igor Lasota
    • Piotr Maruszewski
    • Michał Szociński
    • Kazimierz Darowicki
    2024 MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION

    The paper presents the results of NDT examinations, metallographic tests and risk assessment of degradation related to corrosion of amine regeneration unit in a desulphurisation system. Intensive corrosion resulting from acid gases environment upon water condensation causes perforation of the pipeline. Detailed analysis reveals cracking related to the mechanism of wet H2S. Hydrogen penetration, resulting from the wet H2S process, causes a decrease in mechanical properties of steel and an increase in hydrogen content inside steel. Corrosion results mostly from high stream velocity, the presence of acid gases (with high ammonia content), the presence of amine and low stream temperature.

  • What drives sustainable investing? Adoption determinants of sustainable investing exchange-traded funds in Europe
    • Adam Marszk
    • Ewa Lechman
    2024 Structural Change and Economic Dynamics

    Despite the growing interest in various topics related to sustainable (ESG) investing, some issues remain understudied, such as the determinants of their utilization at the macro level. This paper contributes to the state of knowledge two-directionally. First, it shows the development of sustainable investing exchange-traded funds (ETFs) in European countries. Second, it traces the significant determinants of adopting sustainable investing/ESG ETFs in Europe. More specifically, we aim to determine which financial, technological, social or institutional factors have the most significant impact on the growth of levels and over-time dynamics of the sustainable investing ETFs. The empirical sample covers five European economies: France, Germany, Italy, Switzerland, and the United Kingdom and the period of the analysis is 2006-2020. Adopting panel regression analysis, we investigate twenty different variables that potentially impact the development of sustainable investing ETFs across examined countries. Our results confirm the positive effects of the development of insurance companies and pension funds for the assets of the ESG ETFs. Also, factors such as stock markets development, ICT adoption, financial access and literacy, and the prevalence of tertiary-level education demonstrate a positive impact on ESG ETFs. The role of the financial performance and tax levels resulted in being neutral, thus indicating the lesser importance of the financial motives in relation to the other factors. The results were mixed in the case of the mutual funds and institutional variables.

  • What is the future of digital education in the higher education sector? An overview of trends with example applications at Gdańsk Tech, Poland
    • Alina Guzik
    • Michał Tomczak
    • Małgorzata Gawrycka
    2024 Full text Global Journal of Engineering Education

    Universities worldwide recognise the need to adapt to changes in society, the economy and the way young people prefer to learn. Additionally, the impetus to improve the digital approach in higher education intensifies as educational institutions have to remain competitive with commercial providers of education. Following the latest technological trends and implementing strategies to develop new digital solutions helps to improve the teaching process and the quality of academic teaching. The purpose of this article is to identify, analyse and discuss digital education trends and development directions targeted at the higher education sector. The authors provide a comprehensive overview of the current situation and illustrate practical implementations through examples from Gdańsk University of Technology (Gdańsk Tech), Poland. These include e-learning, micro-credentials, extended reality (XR) technologies, gamification, digital textbooks and generative artificial intelligence (AI). Possible new directions of on-line digital education in the higher education sector development, as well as the benefits and associated risks, are also identified and discussed.

  • What makes them dream big? Determinants of business growth aspirations among Polish students
    • Jakub Golik
    2024 Entrepreneurial Business and Economics Review

    The objective of the article is to explore the concept of business growth aspirations and identify its determinants at an early stage of the entrepreneurial process. In this exploratory study, I focused on the underexplored approach to entrepreneurial process i.e. to study the growth aspirations and its determinants alongside entrepreneurial intentions. Studying growth aspirations and their determinants provides valuable insights into how these aspirations form. This contributes to the literature and future empirical studies on the entrepreneurial process. The results show that entrepreneurial self-efficacy and entrepreneurial intention proved to be statistically insignificant. Eventually, I found six of the variables to influence the declared growth aspirations of respondents in a statistically significant way, namely: gender, family business background, entrepreneurial role model, declared resistance to stress, and perception of higher income and prestige as the most attractive features of entrepreneurship. Moreover, I identified a gender gap in growth aspirations. Finally, I verified five out of eight proposed research hypotheses and discussed the conclusions. The most important finding shows the presence of a gender gap in growth aspirations as early as at the time of studies. Therefore, it is advised that policymakers focus on this gap while designing entrepreneurship courses and take it into account. Secondly, it is important to accurately measure stress resistance among students, to show it as a potential advantage, and to teach safe coping strategies. Furthermore, it is recommended to promote the high social status of entrepreneurs, both in the financial (potentially higher income) and non-financial sense (prestige and satisfaction) while at the same time consciously educating about potential dangers. The study makes an original contribution to the literature on growth aspirations by answering the call to further explore their potential antecedents and is one of the first to do so at the earliest stage of the entrepreneurial process. It is achieved by studying determinants pertaining to sociocultural and individual dimensions which – according to some studies – require further investigation. Moreover, it is done in an unexplored context of students in a developing country in Europe. Finally, the article recognises the ambiguity in defining growth aspirations and suggests a clear distinction to be included in the literature and future research.

  • When Does Automation in Government Thrive or Flounder?
    • Elsa Estevez
    • Tomasz Janowski
    • David Benjamin Roseth
    2024

    Government organizations worldwide are harvesting the transformative potential of digital technologies to automate interactions with citizens, businesses, and each other. Automation can bring benefits, such as an increase the efficiency of government operations, quality of government decisions, and convenience of government-citizen interactions. It can also produce adverse outcomes, such as compromising social value for economic gains, misjudging citizen circumstances, and having to compensate for the effects of algorithmic errors. This publication delves into the implications of automation and how to implement initiatives that increase its benefits and manage its risks. Specific questions include: (i) how to identify areas of public policy and public services that are most apt for automation; (ii) what questions, regarding potential benefits and costs, should governments ask before embarking on a process of automation; (iii) how governments should monitor the benefits and costs in the process of automation and establish whether automation has had the desired impact; and (iv) how to organize and manage automation efforts. The authors explore these issues through 12 case studies from 8 countries (Argentina, Chile, France, Norway, Paraguay, Singapore, Spain, Sweden), the European Union, and 7 government sectors (administration, border control, finance, justice, procurement, registry, and welfare). Each case study identifies the problem automation was designed to resolve or service it was designed to deliver; potential benefits and costs of automation that were relevant in each context; and examples of how automation was implemented to reduce costs and monitored to ensure high impact without unintended negative consequences. The cases guide the formulation of a taxonomy of benefits and risks of government automation initiatives and the four broad factors that government organizations should consider when aiming to realize the benefits and manage the risks of such initiatives: institutional readiness, human capacity, process innovation, and whole-of-government approach. It also presents strategies for implementing the factors and discusses how they help produce public value.

  • Why Are Left-Handed G-Quadruplexes Scarce?
    • Michał Jurkowski
    • Mateusz Kogut
    • Subrahmanyam Sappati
    • Jacek Czub
    2024 Full text Journal of Physical Chemistry Letters

    G-quadruplexes (G4s) are nucleic acid structures crucial for the regulation of gene expression and genome maintenance. While they hold promise as nanodevice components, achieving desired G4 folds requires understanding the interplay between stability and structural properties, like helicity. Although right-handed G4 structures dominate the experimental data, the molecular basis for this preference over left-handed helicity is unclear. To address this, we employ all-atom molecular dynamics simulations and quantum chemical methods. Our results reveal that right-handed G4s exhibit greater thermodynamic and kinetic stability as a result of favorable sugar–phosphate backbone conformations in guanine tracts. Moreover, while hydrogen-bonding patterns influence helicity-specific G4 loop conformations, they minimally affect stability differences. We also elucidate the strong correlation between helicity and the strand progression direction, essential for G4 structures. These findings deepen our understanding of G4s, providing molecular-level insights into their structural and energetic preferences, which could inform the design of novel nanodevices.

  • Why do Open Government Data initiatives fail in developing countries? A root cause analysis of the most prevalent barriers and problems
    • Charalampos Harris Alexopoulos
    • Stuti Saxena
    • Marijn Janssen
    • Nina Rizun
    • Martin Lnenicka
    • Ricardo Matheus
    2024 Full text Electronic Journal of Information Systems in Developing Countries

    Open government data (OGD) include the provision of government data, which have so far been reserved for the provision of public utilities and services, wherein different stakeholders may create value out of the same source. Recently, OGD initiatives around the world have dampened or were found to be inadequate for one or other reasons. The present study seeks to underline the root causes behind these inadequate or stalled initiatives with a specific focus on the developing countries. This article undertakes a literature review of the most significant studies in this area, followed by a root cause analysis wherein the database across Scopus and Web of Science has been explored with the set inclusion and exclusion criteria being set in line with the research focusing on the hinderances and bottlenecks behind the failure of OGD initiatives (n 15), thus not only summarizing what has been revealed in previous studies but also identifying these “root-cause” relationships, which are responsible for the stalled OGD projects. A deep understanding of the literature on OGD shows that research of OGD barriers repeat each other. The results show that the main root causes include politico-administrative, social, technological, legal and organizational (inter- and intra) dimensions including aspects like state of the economy, infrastructural issues, the tendency to copy the OGD initiative without need to institutionalize the same, and so forth. Whereas a number of studies are available covering the barriers in the roll-out and implementation of OGD initiatives, the root causes behind the existence of these barriers have not been identified so far-the present study seeks to plug this gap. Besides being a contribution to the extant OGD literature in general, the study seeks to leave academic and practical implications for furthering up deliberations and discussions on the OGD themes with specific impetus upon the cause analysis of the failure in OGD initiatives and the manner in which the same may be corrected or preempted

  • Wideband High-Gain Low-Profile Series-Fed Antenna Integrated with Optimized Metamaterials for 5G millimeter Wave Applications
    • Bashar Esmail
    • Sławomir Kozieł
    • Anna Pietrenko-Dąbrowska
    • Dustin Isleifson
    2024 Full text Scientific Reports

    This paper presents a series-fed four-dipole antenna with a broad bandwidth, high gain, and compact size for 5G millimeter wave (mm-wave) applications. The single dipole antenna provides a maximum gain of 6.2 dBi within its operational bandwidth, which ranges from 25.2 to 32.8 GHz. The proposed approach to enhance both gain and bandwidth involves a series-fed antenna design. It comprises four dipoles with varying lengths, and a truncated ground plane. These dipoles are connected in series on both sides, running in parallel through a microstrip line. The proposed design significantly enhances the bandwidth, which extends from 26.5 to 40 GHz. This frequency range effectively covers the 5G bands of 28 and 38 GHz. The expedited trust-region (TR) gradient-based search algorithm is utilized to optimize the dimensions of the antenna components, resulting in a maximum gain of 11.2 dBi at 38 GHz. To further enhance the gain, modified H-shaped metamaterial (MTM)-based unit cells are integrated into the antenna substrate. The TR algorithm is employed once more to optimize the MTM dimensions, yielding a maximum gain of 15.1 dBi at 38 GHz. The developed system is experimentally validated, showing excellent agreement between the simulated and measured data.

  • Wieczne chemikalia. Czy zostaną z nami na zawsze?
    • Natalia Walczak
    • Małgorzata Szopińska
    • Filip Gamoń
    • Aneta Łuczkiewicz
    • Sylwia Fudala-Książek
    2024 Chemia Przemysłowa

    Każdy z nas ma kontakt z przedmiotami takimi jak patelnia z powłoką teflonową, baterie, nici dentystyczne, papierowe kubki i słomki czy kosmetyki. Co je łączy? Wszystkie w swojej strukturze mogą zawierać związki poli- i perfluoralkilowe znane jako PFAS i należące do grupy tzw. „wiecznych chemikaliów”.

  • Wind Speed Probabilistic Forecast Based Wind Turbine Selection and Siting for Urban Environment
    • Shivangi Sachar
    • Shubham Shubham
    • Piotr Doerffer
    • Anton Ianakiev
    • Paweł Flaszyński
    2024 Full text IET Renewable Power Generation

    Wind energy being a free source of energy is becoming popular over the past decades and is being studied extensively. Integration of wind turbines is now being expanded to urban and offshore settings in contrast to the conventional wind farms in relatively open areas. The direct installation of wind turbines poses a potential risk, as it may result in financial losses in scenarios characterized by inadequate wind resource availability. Therefore, wind energy availability analysis in such urban environments is a necessity. This research paper presents an in-depth investigation conducted to predict the exploitable wind energy at four distinct locations within Nottingham, United Kingdom. Subsequently, the most suitable location, Clifton Campus at Nottingham Trent University, is identified where a comprehensive comparative analysis of power generation from eleven different wind turbine models is performed. The findings derived from this analysis suggest that the QR6 wind turbine emerges as the optimal choice for subsequent experimental investigations to be conducted in partnership with Nottingham Trent University. Furthermore, this study explores the selection of an appropriate probability density function for assessing wind potential considering seven different distributions namely, Gamma, Weibull, Rayleigh, Log-normal, Genextreme, Gumbel, and Normal. Ultimately, the Weibull probability distribution is selected, and various methodologies are employed to estimate its parameters, which are then ranked using statistical assessments.

  • Window frame integrable air recuperation minichannel/minigap heat exchanger
    • Paweł Dąbrowski
    • Rafał Andrzejczyk
    • Maciej Wacławik
    • Dariusz Mikielewicz
    2024 APPLIED THERMAL ENGINEERING

    This article describes an evaluation of mini heat exchangers operation as a decentralized mechanical ventilation system with recuperative heat recovery that can be integrated into the window frame. The relatively small yet efficient air recuperation system allows for retrofitting existing buildings by reducing the overall energy consumption and thus the CO2 emissions. The proposed design, unlike existing systems, is easy to scale up to various room sizes and is a promising solution for buildings where a centralized recuperation system cannot be implemented or interfering with the building’s facade is not allowed. The experimental research was carried out enabling to collect temperature, pressure drop, and volumetric flow rate measurements in a recuperation system with various minigeometries, namely minichannels with a hydraulic diameter of 3.00 mm, minigaps with a hydraulic diameter of 5.82 mm, and minigaps with a hydraulic diameter of 1.98 mm. The system was tested for a room air temperature of 22°C and three values of outside air temperatures, namely 5°C, 10°C, and 15°C. The volumetric flow rate for a single heat exchanger ranged from 4.1 m3/h to 20.4 m3/h. The results showed that higher temperature rise of supplied air and higher energy efficiency of the heat recovery can be achieved for smaller airflows and higher differences between outside and room temperatures. For an exemplary 34 m2 office room, the 0.8-fold air exchange rate can be provided and 1 667.1 kWh of annual energy savings can be achieved, corresponding to 50.3% of total energy required for heating the air. Heat exchangers equipped with 3.00 mm minichannels recover a similar amount of heat as the ones equipped with 5.82 mm minigaps, even though the hydraulic diameter of the minichannel is almost 2 times smaller. Meanwhile, a 5.82 mm minigap reduces the pressure drop by 76% compared to a 3.00 mm minichannel.

  • Wireless Charging Station Design for Electric Scooters: Case Study Analysis
    • Viktor Shevchenko
    • Oleksandr Husev
    • Dmitri Vinnikov
    • Ryszard Strzelecki
    • Bohdan Pakhaliuk
    2024 Full text ENERGIES

    This study proposes an example of a wireless charging station design for a small-scale vehicle available on the market. The article analyzes basic transmitter inverter topologies and their compensation methods in terms of flexibility of control, tolerance to uncertainty in positioning, and the possibility of decreasing the integration price. Our comprehensive analysis focuses on the battery voltage range, energy capacity, cost, and travel distance. We evaluate the constraints of efficiency, transmitted power, amount of used material, and size of the energy delivery system based on our design example. The aim is to increase the penetration of wireless technology in terms of convenience and integration capabilities.

  • Wirtualny pokój zagadek z zakresu matematyki
    • Radosław Baziak
    • Tomasz Daruk
    • Karol Żyra
    • Dorota Żarek
    • Jacek Lebiedź
    2024 Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej

    W artykule przedstawiono realizację pokoju z zagadkami matematycznymi opartego na rzeczywistości wirtualnej. Celem było stworzenie wciągającej gry z zakresu matematyki, w którą aktywnie angażują się studenci. Zespół badawczy zbudował aplikację do wykorzystania w Laboratorium Zanurzonej Wizualizacji Przestrzennej na Politechnice Gdańskiej. Gra składa się z czterech pokojów: pokoju wprowadzającego i trzech pokojów tematycznych. Łącznie w pokojach znajduje się 13 zagadek wymagających matematycznego myślenia. W celu oceny walorów edukacyjnych narzędzia, przygotowano ankiety i przeprowadzono eksperyment ze studentami pierwszego i trzeciego roku studiów. W artykule autorzy omówili zastosowanie rzeczywistości wirtualnej i koncepcji pokoju zagadek (ang. escape room) w celu stworzenia innowacyjnego narzędzia angażującego studentów w proces nauki matematyki w interaktywnej, stymulującej wizualnie scenografii.