2023 - Publications Repository - Gdańsk University of Technology

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Publications from the year 2023

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The influence of polymer bearing material and lubricating grooves layout on wear of journal bearings lubricated with contaminated water
- Wojciech Litwin
- Michał Wasilczuk
- Michał Wodtke
- Artur Olszewski
2023 TRIBOLOGY INTERNATIONAL
The goal of the present paper is to investigate wear properties of journal sliding bearing operating in the conditions of contaminated water lubrication. Several bearing materials and bearing sleeve designs (differing in the axial grooves position and their shape) were tested experimentally under typical operating conditions in a dedicated test rig, which was equipped with a lubricating system, enabling lubrication with contaminated water. Results of the tests show that water contamination has a strong impact on the wear of the bearing system elements. It was revealed that some of the tested materials are beneficial in such demanding conditions and demonstrate lower wear rates. The design of the bearing bush also seems to have an impact on the wear, because bearings of different designs made from the same material demonstrated differences exceeding 100 %. Higher water velocity in the lubricating grooves helps to minimize the wear of the stainless steel shaft. This was also confirmed by numerical simulations.
The Influence of the Radio Channel on Precision of Position Estimation of the User Terminal Using the NB-IoT Radio Interface
- Piotr Rajchowski
- Krzysztof Cwalina
- Jarosław Sadowski
2023
In the article the method of user terminal position estimation using the broadcast signals transmitted in the downlink of the NB-IoT interface was presented, including the analysis of the radio channel influence on precision of position estimation as well as the eNodeB (Evolved Node B) synchronization. The practical ability to estimate the position in the test area has been verified in the laboratory conditions, using the reference signals with a variable signal-to-noise ratio and different radio channel profiles. Additionally, the method that allows increasing the precision of the terminal position estimation without the need of increasing the sampling frequency of the radio signal is presented.
The influence of the size of a one-faced metallic head in Janus nanoparticles as a co-catalyst on the photocatalytic efficiency of hydrogen evolution under vis light irradiation
- Anna Gołąbiewska
- H. Głowienke
- Wojciech Lisowski
- Onur Cavdar
- Grzegorz Trykowski
- Tomasz Klimczuk
- Adriana Zaleska-Medynska
2023 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Janus nanoparticles (NPs) consisting of MoOxSy nanospheres and silver (Ag) head, successfully developed by a simple, controlled method were in the first time they were applied as a co-catalysts in photocatalytic hydrogen generation reaction under vis light irradiation (λ > 420 nm). The MoOxSy-Ag as a co-catalysts were deposited on the obtained ZnIn2S4 microspheres (ZIS) using physical absorption method. The influence of the size of a one-faced metallic head (Ag) in JNPs as a co-catalyst on the photocatalytic efficiency of hydrogen evolution has been investigated. Sample 2.5-Ag-MoOxSy@ZIS with the co-catalyst with the smallest head in the range of about 61–71 nm was characterized by 34 times higher photocatalytic hydrogen generation activity compared to pure ZIS. JNPs as a co-catalyst are characterized as asymmetric structure and precisely adjusted interface and thus, they influence on a very good electron mobility in hybrid metal-semiconductor nanostructures. JNPs can be a new alternativity to metal co-catalysts used in a photocatalytic hydrogen production reaction.
The In-House Method of Manufacturing a Low-Cost Heat Pipe with Specified Thermophysical Properties and Geometry
- Michał Rogowski
- Maciej Fabrykiewicz
- Paweł Szymański
- Rafał Andrzejczyk
2023 Full text Applied Sciences-Basel
Various types of heat pipes are available to purchase off the shelf, from various manufacturers, but most of them have strictly defined geometry and technical parameters. However, when there is a need to use a heat pipe (HP) with an unusual size and shape or working conditions other than the standard ones, it becomes very costly to order them from manufacturers, especially in small quantities, and only a few producers are willing to fulfill such an order. This paper presents a detailed description and step-by-step method of manufacturing and testing a low-cost HP with specific properties and geometry, cooperating with a modular heat recovery system based on the use of phase change materials (PCM) for electromobility applications. The presented heat pipes were made entirely by hand, primarily with the use of basic workshop tools, without the use of specialized and automated CNC machines. Utensils used during the process were either made by hand or using desktop FDM 3D printers. During the evaluation of heat pipes’ performance within PCM (coconut oil), simple statistical functions were used. One-dimensional and two-dimensional histograms were used to visualize data obtained during this research. The presented method allows the manufacturing of heat pipes that are, on average, able to melt about 35% more PCM than an empty copper pipe with the exact same geometry. The HPs’ performance in coconut oil was evaluated on the basis of their future applications.
The interactions of monomeric acridines and unsymmetrical bisacridines (UAs) with DNA duplexes: an insight provided by NMR and MD studies
- Tomasz Laskowski
- Michał Kosno
- Witold Andrałojć
- Joanna Frąckowiak
- Julia Borzyszkowska-Bukowska
- Paweł Szczeblewski
- Nikola Radoń
- Maria Świerżewska
- Anna Woźny
- Ewa Paluszkiewicz
- Zofia Mazerska
2023 Full text Scientific Reports
Members of a novel class of anticancer compounds, exhibiting high antitumor activity, i.e. the unsymmetrical bisacridines (UAs), consist of two heteroaromatic ring systems. One of the ring systems is an imidazoacridinone moiety, with the skeleton identical to the structural base of Symadex. The second one is a 1-nitroacridine moiety, hence it may be regarded as Nitracrine’s structural basis. These monoacridine units are connected by an aminoalkyl linker, which vary in structure. In theory, these unsymmetrical dimers should act as double-stranded DNA (dsDNA) bis-intercalators, since the monomeric units constituting the UAs were previously reported to exhibit an intercalating mode of binding into dsDNA. On the contrary, our earlier, preliminary studies have suggested that specific and/or structurally well-defined binding of UAs into DNA duplexes might not be the case. In this contribution, we have revisited and carefully examined the dsDNA-binding properties of monoacridines C-1305, C-1311 (Symadex), C-283 (Ledakrin/Nitracrine) and C-1748, as well as bisacridines C-2028, C-2041, C-2045 and C-2053 using advanced NMR techniques, aided by molecular modelling calculations and the analysis of UV–VIS spectra, decomposed by chemometric techniques. These studies allowed us to explain, why the properties of UAs are not a simple sum of the features exhibited by the acridine monomers.
The interplay between dopant and a surface structure of the photocatalyst – The case study of Nb-doped faceted TiO2
- Szymon Dudziak
- Ewa Kowalska
- Kunlei Wang
- Jakub Karczewski
- Miroslaw Sawczak
- Bunsho Ohtani
- Anna Zielińska-Jurek
2023 Full text APPLIED CATALYSIS B-ENVIRONMENTAL
Anatase nanoparticles, exposing the majority of the {0 0 1}, {1 0 0} and {1 0 1} facets were synthesized and doped with different niobium amount to investigate the self-trapping of the excess electrons and resulting photocatalytic activity. Photocatalyst structure and presence of excess electrons inside the obtained Nb-doped anatase samples was confirmed by the combination of structural and spectroscopic analyses. Only for the {1 0 1} facets, introduced electrons were found to localize on the surface titanium sites, as long as the analysis was performed in the ambient environment. The photocatalytic activity data, studied in the reaction of 4-nitrophenol reduction and phenol oxidation, show that the dopant-introduced electrons might increase photocatalytic activity only for the anatase structures exposing {0 0 1} and {1 0 0} facets. Ultimately, the dopant effect on the photocatalytic activity depends on the exposed facet, which might be investigated for other systems to increase their applicability.
The KLC Cultures, Tacit Knowledge, and Trust Contribution to Organizational Intelligence Activation
- Wioleta Kucharska
- Denise A. D. Bedford
2023 Full text
In this paper, the authors address a new approach to three organizational, functional cultures: knowledge culture, learning culture, and collaboration culture, named together the KLC cultures. Authors claim that the KLC approach in knowledge-driven organizations must be designed and nourished to leverage knowledge and intellectual capital. It is suggested that they are necessary for simultaneous implementation because no one of these functional cultures alone is as beneficial for a company as all of them are together. Moreover, there is a risk that organizations with a learning culture developed without collaboration are stuck at the individual level of learning only; and that a knowledge culture developed without a learning culture jeopardizes the organization to be stuck in a passive way where only old, multiply verified knowledge is accepted. As a result, such companies cannot grow. That extreme situation leads to the rejection of new knowledge that is usually rationalized by the need for business safety security - that is nothing more than a ruse for intellectual laziness or personal barriers of fixed-minded managers. Summing up, based on the empirical evidence (640-cases sample, composed of Polish knowledge workers; SEM method of analysis), this paper delivers empirical evidence that knowledge culture rejects mistakes acceptance component of learning culture and that the learning climate component itself is not sufficient for explicit knowledge sharing. Knowledge sharing, organizational intelligence, and innovativeness are key benefits of the synergy that offers the KLC cultures simultaneous implementation and cultivation. The results expand the former studies by Kucharska and Bedford (2020; 2023) and Kucharska (2021a-b) and expose that KLC cultures and TRUST are needed to develop tacit knowledge sharing clearly is an essential ingredient for organizational intelligence development.
The lanthanide influence on selected properties of BaLnCo2O6-δ
- Iga Szpunar
2023 Full text
The subject of research of this dissertation are cobalt oxides with a double perovskite structure with a general formula BaLnCo2O6-δ, where Ln stands for La, Pr, Nd, Sm, Gd, Tb, Dy. The aim of the study was to verify the ability of these materials to form the protonic defects, as well as to identify the factors determining this ability. As part of the work, materials from the proposed group were synthesised and characterized. To verify the research hypotheses the following techniques were used: powder x-ray diffraction, synchrotron radiation x-ray diffraction, powder neutron diffraction, scanning and transmission electron microscopy, thermogravimetry, iodometric titration, and x-ray absorption spectroscopy. The increase in mass in the atmosphere containing water vapour, which may indicate the incorporation of protonic defects into the material structure, was observed only in BaLaCo2O6-δ i BaGdCo2O6-δ. It has also been shown that this effect is not related to the existence or formation of secondary phases. It was observed that the factor determining the material's ability to form the protonic defects is the electronic structure of the material, resulting from the interaction between the lanthanide 4f orbitals, and the 3d cobalt and 2p oxygen orbitals.
The Lost Kinetic Architecture and How to Reintroduce it in the Landscape – The Case Study of the Drainage Windmills in the Vistula Delta
- Jakub Kołodziejczak
- Jan Cudzik
2023 Heritage and Society
Recreating the lost kinetic landscape of the Vistula Delta is a considerable challenge. The study aims to propose a method for reproducing windmills and their effect on the landscape. The paper suggests a method based on the transposition of the forms of movement from windmills historically present in the region to modern forms. The method is based on a series of analyses starting with the study of the region and its history followed by extracting and developing the characteristics and proportions of a windmill and its impact on the landscape and human senses. Newly introduced forms are not intended to recreate historical windmills but to become a reminiscence of the history and to create a significant landscape history. The impact of new forms of historical windmills creates a series of opportunities – starting from an architectural conservation approach and ending up with landscape preservation. It is a chance to bring back the lost landscape elements and to provide interactive installation forms.
The Methodology for Determining the Theoretical Based on the Characteristics of Effective Absorbency Versus Pressure Drop in the Motor
- Paweł Śliwiński
2023
This article describes a method for determining the theoretical and actual working volume of a hydraulic motor. It has been shown that the actual working volume of the motor is the sum of the theoretical working volume and the additional volume that depends on the pressure drop in the working chambers of the motor. It was also shown that the volumetric losses in the hydraulic motor are not only a function of the pressure drop in the working chambers, but also a non-linear function of the motor speed. The results of the experimental tests of the satellite motor are also described. Analysis of the test results confirmed the correctness of the method for determining both the theoretical working volume and the actual working volume. It was also shown that the calculation of the partial efficiencies (i.e. mechanical ef-ficiency and volumetric efficiency) of a hydraulic motor should be based on the actual working volume instead of the theoretical one.
The need for new transport protocols on the INTERNET
- Józef Woźniak
- Krzysztof Nowicki
2023 Automatyka Elektryka Zakłócenia
The TCP/IP protocol suite is widely used in IP networks, regardless of diverse environments and usage scenarios. Due to the fact of being the basic concept of organizing the work of the Internet, it is the subject of interest and constant analysis of operators, users, network researchers, and designers. The Internet is a "living" organism in which new needs appear all the time. This is particularly important due to the emerging new application requirements - at the highest level of network architecture, and at the same time, completely new ways of transmitting messages related to new technologies and reception techniques, allowing for parallelization of messages transfer and lossless switching/handover between several interfaces. The paper highlights the expectations and requirements related, in particular, to new "multi-object" applications, as well as the limitations resulting from the high inertia observed on the side of the IP network transport infrastructure. Taking into account both the limitations and the formulated requirements, the selected end-to-end transport protocols have been characterized. More attention was paid to two protocols implementing multi-stream transfers, namely SCTP and QUIC.
The new investing effectiveness evaluation multi-criteria method in modern supply systems
- Waldemar Kamrat
2023 Gaz, Woda i Technika Sanitarna
The important problem in the processes of modelling and programming the development of sustainable energy sector is the multi-criteria manner of assessing the effectiveness of investments. The goal of this paper is to show how to take into account the impact of investments in multidimensional modelling decision-making processes. This goal can be achieved through the development, presentation, and use of a new multi-criteria method of evaluating the effectiveness of investing towards to modern energy sector. This innovative method was developed and tested in research for the energy sector carried out by the author. It is a new multi-criteria method, consisting of a relatively simple way of taking into account the qualitative features of the criteria in the process of evaluating investments in the energy sector. Using the real data of the energy invested in the city of X in Poland, the effectiveness of the project was examined applying the multi-criteria method proposed by the author, and for the same purpose, the well-known ELECTRE method was used. The comparison of the results of the investment effectiveness studies by both methods confirmed the high convergence of the effects obtained in both methods
The new method of ZnIn2S4 synthesis on the titania nanotubes substrate with enhanced stability and photoelectrochemical performance
- Daria Roda
- Konrad Trzciński
- Marcin Łapiński
- Maria Gazda
- Miroslaw Sawczak
- Andrzej Nowak
- Mariusz Szkoda
2023 Full text Scientific Reports
The new method of ZnIn2S4 synthesis on the titania nanotubes substrate with enhanced stability and photoelectrochemical performance
The Novel Findings About the Hussite’s Warfares in the Gdansk/Danzig Surrounding in the Late Summer of 1433
- Piotr Samól
2023
One of the most spectacular episodes during the Hussite Wars was the Czech raid through the lands of the Teutonic Order up to the Baltic Sea in 1433. Although historians and then-witnesses focused on the sacked Cistercian Abbey in Oliva and soldiers filling the bottles with seawater, the scale of damages in the main harbour of Prussia and its surroundings has not been the subject of research yet. Furthermore, most scholars treatthe potential attack on Gdansk as a spontaneous or apparent action. The author's most recent monographic studies of the Gdansk agglomeration in the Middle Ages, which consisted of three semi-independent municipalities (Main City, Old City, Young City), includes collecting unknown or never-used-before archival evidence and the results of just-completed archaeological research. These new findings give an opportunity to precisely reconstruct the day-by-day history of assaulton Gdansk, the unsuccessful attempt to capture the city and the plundering ca. 30 villages belonging to the Order, monasteries, burghers and gentry. Moreover, it allows shedding light on the different tactics of the two medieval armies and analysing the role of fear in then-politics and military operations. In the case of Gdansk, the awareness of damages caused by Hussites' attack on the agglomeration, its suburbs and harbour, might have been one of the crucial reasons why the city council, during the civil war in Prussia, decided to demolish one of the three municipalities - the Young City (Jungstadt) in 1455.
The novel sterilization device: the prototype testing
- Paweł Wityk
- Dorota Kostrzewa-Nowak
- Robert Nowak
- Anna Wierzbicka-Woś
- Waldemar Gos
2023 Full text Scientific Reports
Currently, there are numerous methods that can be used to neutralize pathogens (i.e., devices, tools, or protective clothing), but the sterilizing agent must be selected so that it does not damage or change the properties of the material to which it is applied. Dry sterilization with hydrogen peroxide gas (VHP) in combination with UV-C radiation is well described and effective method of sterilization. This paper presents the design, construction, and analysis of a novel model of sterilization device. Verification of the sterilization process was performed, using classical microbiological methods and flow cytometry, on samples containing Geobacillus stearothermophilus spores, Bacillus subtilis spores, Escherichia coli, and Candida albicans. Flow cytometry results were in line with the standardized microbiological tests and confirmed the effectiveness of the sterilization process. It was also determined that mobile sterilization stations represent a valuable solution when dedicated to public institutions and businesses in the tourism sector, sports & fitness industry, or other types of services, e.g., cosmetic services. A key feature of this solution is the ability to adapt the device within specific constraints to the user’s needs.
The optimization of CuxO microwires synthesis for improvement in photoelectrochemical performance
- Jakub Sowik
- Paweł Mazierski
- Tomasz Klimczuk
- Kostiantyn Nikiforow
- Anna Malankowska
- Adriana Zaleska-Medynska
2023 JOURNAL OF SOLID STATE CHEMISTRY
One of the most important challenges in the fabrication of CuxO microstructures via the electrochemical method is formation of long, regular and well-packed microwires with good adhesion on the Cu substrate and to achieve better photoelectrochemical properties, which can be potentially applied in solar-driven water splitting and CO2 conversion to light hydrocarbons. In this paper, Cu2O photoelectrode has been fabricated by direct anodization of the Cu foil, then CuO microwires (MWs) was formed by calcination process. The effect of the applied potential (10–40 V), sodium fluoride content in the electrolyte (0.2–0.5% wt.) as well as calcination conditions (400–500 °C, 60–360 min) on the morphology, phase composition, optical and photoelectrochemical properties was investigated. The highest photocurrent response was −0.71 mA cm−2 for the sample 0.35%_10V_400 °C_60min with 0.83 μm length and 154 nm diameter. The mechanism of the photocurrent generation process in the presence of CuxO/Cu under UV–Vis irradiation was proposed.
The (over)touristification of European historic cities: a relation between urban heritage and short-term rental market demand
- Łukasz Bugalski
2023
In this chapter, I wish to highlight the critical relationship between heritage management issues and building environment transformation. I argue that such a relationship is directly expressed through the tourism phenomenon, and it should be measured through the economic dimension of the short-term rental market, which introduces this rule of thumb: if there is a lack of demand, the brand of the city is weak; if there is too much demand, the city is endangered by overtourism processes. The potential to measure this tourism phenomenon could become a crucial methodological asset for further research in heritage studies – especially in the context of the ongoing touristification of historic European cities.
The Physiological Effects of ASMR on Anxiety
- Sahar Seifzadeh
- Vahid Asayesh
- Majid Torabi
- Mahdi Dehghani
- Elham Rabbani
- Fatemeh Asgharianasl
2023 Full text Frontiers in Biomedical Technologies
Purpose: Autonomous Sensory Meridian Response is a novel phenomenon that is very popular these days on Youtube and Reddit to its anti-anxiety effects. As the name suggests, ASMR is a relaxing warm sensation that begins on the scalp and spreads throughout the body. This technique is also known as "brain massage," and it relies on soothing sights and sounds, like whispers and slow movements. Investigating these videos is primarily motivated by the desire to determine their scientific origins, which can be derived from a variety of approaches. Materials and Methods: In this paper, we intended to examine the physiological changes such as Heart Rate (HR) as well as Galvanic Skin Conductance (GSC) levels before and after watching a single session ASMR video. Results: The dependent t-test statistical analysis by SPSS results with P-value <=0.01 indicated that after a single session of ASMR watching, the heart rate decreased significantly comparing the baseline data. In addition, the skin conductance was slightly reduced as well, but not significantly. Conclusion: These physiological findings prove that ASMR could be an affordable, portable, and immediate anxiety relief for those struggling with anxiety-based disorders, especially for patients who do not respond well to medication or seek alternatives to anti-anxiety medications due to the wide range of side effects or would like to try it for better results along with the prescribed drugs. Keywords: Autonomous Sensory Meridian Response; Heart Rate; Skin Conductance; Anxiety-Based Disorders; Primary Insomnia; Anti-Anxiety Methods
The presence of polycyclic aromatic hydrocarbons in disposable baby diapers: A facile determination method via salting-out assisted liquid-liquid extraction coupled with gas chromatography-mass spectrometry
- Paweł Georgiev
- Mariusz Belka
- Tomasz Baczek
- Justyna Płotka-Wasylka
2023 JOURNAL OF CHROMATOGRAPHY A
In this paper we demonstrate the development of the extraction procedure of polycyclic aromatic hy- drocarbons from baby diapers along with their quantification by gas chromatography-mass spectrometry. Apart from covering plastic foil, disposable baby diapers contain sorbents intended to absorb urine and feces. A hygroscopic, adsorptive, and tough-to-homogenize fibrous sorbent, represents an analytical chal- lenge to analytical chemists. To address this issue we optimized and validated a novel extraction protocol including cryogenic homogenization, liquid-liquid extraction and further preconcentration by evaporation. By using deuterated internal standards in conjunction with matrix-matched calibration, high precision and accuracy were achieved. The limit of detection is estimated in the range of 0.041–0.221 ng/g (for fluorene and fluoranthene, respectively), which is far below the concentration currently assumed to be dangerous for children. The method was successfully applied to real samples available on the Polish mar- ket, and it was found that the amount of PAH compounds varies between manufacturers. Most diapers do not have all 15 polycyclic aromatic hydrocarbons in their composition, but there is no diaper that is free of these compounds. The most abundant in diapers was acenaphthalene, where the concentration ranged from 1.6 ng/g diaper up to 362.4 ng/g. The lowest concentration in diapers is chrysene, which is not detected in most diapers. The article is a response to the lack of a harmonized analytical method for the determination of polycyclic aromatic hydrocarbons in disposable sanitary products for children.
The regional energy transformation in the context of renewable energy sources potential
- Bartłomiej Igliński
- Urszula Kiełkowska
- Michał Pietrzak
- Mateusz Skrzatek
- Gopalakrishnan Kumar
- Grzegorz Piechota
2023 RENEWABLE ENERGY
The topics addressed in the article concern the problem of exploiting the potential of renewable energy sources (RES) at the regional level and the problem of the course of regional energy transition processes. Throughout the world, energy transition proceeds in a specific way for each country, due to the different potential of the selected RES and political, institutional and socio-economic conditions. Energy transition processes should support a situation where we have an energy mix based on diversification of conventional and RES. The need to systematically increase the share of energy from renewable sources is indicated here. This fact not only creates opportunities for the production of clean, green energy, but also allows us to focus on the issue of energy potential at the regional level. The main purpose of the article is to conduct an assessment of the energy potential and the course of the regional energy transition for the West Pomeranian Voivodeship (Poland). The analysis performed will allow to determine the degree of energy self-sufficiency of the selected region. The results obtained will also allow answering the fundamental question of whether achieving energy independence based solely on RES is possible at the regional level. It seems that obtaining a positive answer to this question will provide an important argument for supporting energy transition processes. These processes are aimed at developing an economy based on RES.