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Gdańsk University of Technology

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Publications from the year 2023

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  • Natural deep eutectic solvent based ultrasound assisted liquid-liquid micro-extraction method for methyl violet dye determination in contaminated river water
    • Hameed Haq
    • Azmat Wali
    • Faisal Safi
    • Muhammad Balal Arain
    • Lingshuai Kong
    • Grzegorz Boczkaj
    2023 Full text Water Resources and Industry

    Simple and green natural deep eutectic solvent (NADES) based ultrasound assisted liquid-liquid micro-extraction (UA-LLME) method was developed for extraction and determination of methyl violet dye in contaminated river water samples using UV/Vis spectrophotometry. Choline chloride - decanoic acid based natural deep eutectic solvent was used for extraction. Important analytical parameters like pH, deep eutectic solvent volume/phase ratio, tetrahydrofuran volume, sonication time, and temperature were optimized. Limit of detection (LOD) and limit of quantification (LOQ) were 2.20 μg/L and 7.34 μg/L respectively. Relative standard deviation was 2.35–3.21%. Linearity of method was investigated in a concentration range 10–400 μg/L. Enrichment factor was calculated as 20. For 20 mL sample, the optimized parameters were as deep eutectic solvent volume 1.5 mL, tetrahydrofuran volume was 0.6 mL, pH = 6, sonication time 2 min. The optimized method was tested for extraction of methyl violet in real water samples confirming its applicability in routine environmental analysis.

  • Naturally-derived hydrogels for 3D pancreatic tumor models: A short review
    • Edyta Piłat
    • Agnieszka Kurdyn
    • Justyna Kucińska-Lipka
    2023 Polymers from Renewable Resources

    Statistics suggest a high proportion of mortality rate by pancreatic cancer, which is a solid tumor characterized by high heterogeneity and the presence of a complex extracellular matrix. The very low effectiveness of pancreatic cancer treatment roots in the high metastatic potential and drug resistance of this tumor. Therefore, the quest for efficient cellular models enabling precise mimicking in vivo conditions, and anticancer drug development is emerging as a priority. Routinely used 2D culture models offer an initial evaluation of the therapeutic potential of a compound against tumors, while scaffold-free and next-generation scaffold-based 3D hydrogel-based models are found to be promising for appropriate mimicking of the tumor environment and cell interactions. Over the last few years, attention was paid to the use of naturally-derived hydrogel as 3D models for pancreatic tumor modeling. Herein we first overview scaffold-free and scaffold-based 3D tumor models as advanced approaches, followed by placing the focus on naturally-derived hydrogels applied as scaffolds in pancreatic cancer modeling. This short review emphasizes that sustainable hydrogels can almost precisely imitate the complex in vivo microenvironment of pancreatic tumor, thereby hydrogel-based scaffold tumor models may be a breakthrough in pancreatic cancer studies and, in result, significantly improve the poor pancreatic tumor survivability prognosis. Nevertheless, anticancer drug development might be overshadowed by using this family of biomaterials.

  • Nauka w świecie cyfrowym okiem młodego inżyniera - ciekawe profesje w branży informatycznej
    • Przemysław Falkowski-Gilski
    2023 Pismo PG

    Umiejętność organizowania i przetwarzania informacji jest kluczowym elementem w dzisiejszych czasach. Komputery i inne urządzenia elektroniczne są zaprojektowane tak, aby szybko i efektywnie obsługiwać, przetwarzać i prezentować duże ilości informacji. Jednak nie mogą nic zrobić, dopóki ktoś nie powie im, co mają robić. Celem tego artykułu jest przybliżenie młodym adeptom technologii cyfrowych ciekawych zawodów w branży informatycznej.

  • Nauka w świecie cyfrowym okiem młodego inżyniera - strumieniowanie muzyki w sieci
    • Przemysław Falkowski-Gilski
    2023 Pismo PG

    Na początku konsumpcja treści multimedialnych, związanych początkowo z sygnałami audio, była możliwa tylko w sposób stacjonarny. Odtwarzacz muzyczny znajdował się w domu, wraz z niezbędnym nośnikiem fizycznym. Alternatywnym sposobem dla jednostki był udział w występie na żywo w sali koncertowej lub zorganizowanie prywatnego koncertu w domu. Podsumowując, efekty audiowizualne były zarezerwowane tylko dla wąskiego grona odbiorców.

  • Nauka w świecie cyfrowym okiem młodego inżyniera - wpływ pandemii na branżę transmisji strumieniowej
    • Przemysław Falkowski-Gilski
    2023 Pismo PG

    Trwająca pandemia znacznie ograniczyła mobilność użytkowników. Wiele osób zrezygnowało ze swobodnego przemieszczania się z powodów zdrowotnych, osobistych lub innych. Fakt ten dotyczył zwłaszcza studentów, którzy musieli przejść na kształcenie na odległość. Także wiele zawodów powiązanych z technologiami ICT postanowiło skorzystać ze zdalnych mechanizmów wymiany informacji i komunikacji z klientem. Czynniki te z pewnością dały się odczuć jeszcze szerzej w całym świecie cyfrowym.

  • Nauka w świecie cyfrowym okiem młodego inżyniera - zawód streamer
    • Przemysław Falkowski-Gilski
    2023 Pismo PG

    Bezapelacyjnie nowe środki łączności i komunikacji bezprzewodowej oraz mobilne terminale użytkownika zmieniły nie tylko metody dostarczania treści, ale też sposób, w jaki postrzegamy samą informację. Obecnie, dzięki globalnej sieci, ludzie mogą z łatwością konsumować i wymieniać zdigitalizowane dane. Współcześnie większość z nas nie używa już fizycznych dysków do przechowywania plików, robią to za nas platformy chmurowe online.

  • N-doped carbon materials as electrodes for highly stable supercapacitors
    • Anna Ilnicka
    • Malgorzata Skorupska
    • Mariusz Szkoda
    • Zuzanna Zarach
    • Jerzy Łukaszewicz
    2023 Full text Materials Research Letters

    This article reports a strategy to use nitrogen-doped carbon materials as electrodes for supercapacitors. Depending on the carbon precursor, the porous structure is changed with specific surface area reached up to 2270 m2 g−1. The capacitance of carbon materials used as electrodes is related strictly to pore size. The microstructure and nitrogen functionalities enable a high capacitance (327 F g−1) and cycle durability. The nanoporous carbon electrode exhibits long-term cycle life and high cycle stability with a retention of 86% of its initial after 10,000 cycles in neutral electrolyte. Highly porous carbons are thus considered a promising material for supercapacitors.

  • N-doped carbon nanospheres as selective fluorescent probes for mercury detection in contaminated aqueous media: chemistry, fluorescence probing, cell line patterning, and liver tissue interaction
    • Soheil Sojdeh
    • Ali Banitalebi Dehkordi
    • Alireza Badiei
    • Ali Zarrabi
    • Pooyan Makvandi
    • Milad Ashrafizadeh
    • Mohammad Saeb
    • Eder C. Lima
    • Mohammad Rabiee
    • Mohsen Asadnia
    • Thomas J. Webster
    • Navid Rabiee
    2023 ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH

    A precise nano-scale biosensor was developed here to detect Hg2+ in aqueous media. Nitrogen-doped carbon nanospheres (NCS) created from the pyrolysis of melamine–formaldehyde resin were characterized by FESEM, XRD, Raman spectra, EDS, PL, UV–vis spectra, and N2 adsorption–desorption, and were used as a highly selective and sensitive probe for detecting Hg2+ in aqueous media. The sensitivity of NCS to Hg2+ was evaluated by photoluminescence intensity fluctuations under fluorescence emission in the vicinity of 390 nm with a λexc of 350 nm. The fluorescence intensity of the NCS probe weakened in the presence of Hg2+ owing to the effective fluorescence quenching by that, which is not corresponding to the special covalent liking between the ligand and the metal. The effects of the fluorescence nanoprobe concentration, pH, and sensing time were monitored to acquire the best conditions for determining Hg2+. Surprisingly, NCS revealed excellent selectivity and sensitivity towards Hg2+ in the samples containing Co2+, Na+, K+, Fe2+, Mn2+, Al3+, Pb2+, Ni2+, Ca2+, Cu2+, Mg2+, Cd2+, Cr3+, Li+, Cs+, and Ba2+. The fluorescence response was linearly proportional to Hg2+ concentration in 0.013–0.046 µM with a limit of detection of 9.58 nM. The in vitro and in vivo toxicological analyses confirmed the completely safe and biocompatible features of NCS, which provides promise for use for water, fruit, vegetable, and/or other forms of natural-connected materials exposed to Hg2+, with no significant toxicity noticed toward different cells/organs/tissues.

  • Near-Field Wireless Sensing of Plastics and Papers Using Frugal Peel-Off Passive Tag
    • Abhishek Kumar Jha
    • Adam Lamęcki
    • Roberto Gómez-García
    • Michał Mrozowski
    2023 IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES

    This article presents a novel frugal approach of testing plastics and papers using a near-field microwave sensing technique with a peel-off tag. The proposed sensing technique involves two electrical entities: the sensor, which may be regarded as a reader, and a disposable tag. The reader is a modified design of a gap-coupled microstrip line (GCML) sensor, while the passive tag is a standard double-ring complementary split-ring resonator (CSRR) engraved on a commercially available copper foil using laser printing techniques. A detailed numerical study is presented for the engineered sensing methodology, showing the effect of the sample height, sensing distance, bending angle, and inclination. Empirical formulas associated with the dielectric properties of the sample under test are also given. The errors associated with a possible air gap between the peel-off tag and the sample, as well as the relative positioning of the tag and the reader, are analyzed while also considering the bending of the tag. Finally, the sensor is fabricated on a 1.5-mm-thick Rogers RT5880 laminate, and several standard samples are prepared to experimentally check the validity of the approach. The sensor provides a transmission bandwidth (BW) of 1.9 GHz with a typical insertion loss (IL) of 1 dB and a reflection loss of 20 dB. The tag engraved on the frugal peel-off copper foil is used for sensing various dielectric materials by placing it on planar and curved surfaces. The simulation and measured results are found to be in close agreement. The proposed scheme is found to be reliable and cost-effective also for the testing of microwave substrates. It provides robust results for the wireless sensing of objects located within a range of 10 mm from the reader.

  • Negative carbon dioxide gas power plant integrated with gasification of sewage sludge
    • Paweł Ziółkowski
    • Kamil Stasiak
    • Milad Amiri
    • Dariusz Mikielewicz
    2023 Full text ENERGY

    One of the primary objectives of the negative carbon dioxide gas power plant (nCO2PP) is to develop an innovative technology confirming the possibility of the use of sewage sludge to produce electricity while having a positive impact on the environment. In this paper, a mathematical model is presented to estimate thermodynamic parameters of the system in relation to the gasification process and changes in such parameters in the bleeds as well as temperature and pressure. The main novelty of this paper is the integration of the gas-steam turbine model with the gasification reactor model in such a way that the effect of the gasification products on the turbine output is established. In turn, parameters from the turbine bleed directly affect the gasification process and cause feedback for the system. Developed code allows determination of parameters such as efficiency of the proposed nCO2PP cycle, gas composition from the gasifier, temperature in the gas turbine bleed and other related information. The synergy between the CCS plant and the proposed utilization of sewage sludge (which is considered as a renewable energy source) enables the installation to achieve negative overall emissions of CO2.

  • Negative impact of constant RPM control strategy on ship NOx emission in waves
    • Mohammad Ghaemi
    • Hamid Zeraatgar
    2023 Full text International Journal of Energy and Environmental Engineering

    In severe wave conditions, the ship propulsion system is loaded with high fluctuations due to external disturbances. The highly fluctuating loads enforce radical changes in the main engine torque, which in turn demands variation of the fuel rate injected into the cylinders if a constant rotational speed strategy is applied. Therefore, the temperature of gases varies to a large extent during the combustion process in the cylinders. The emitted NOx is a function of this highly fluctuating temperature. The main goal of this study is to investigate NOx emission under the aforementioned conditions when a usual constant RPM control strategy is applied in waves similar to the calm water condition. The paper presents a mathematical model of the whole system, which is applied to a selected ship both in regular waves and in calm water conditions. The results show that the sea waves, in comparison with the calm water condition, can radically increase the emitted NOx under the constant rotational speed strategy. This change can reach even 1014 times more, averagely. The results also show that the higher the wave height the higher the emitted NOx. It is concluded that the control strategy of keeping the engine rotational speed in waves at a constant level is the most important reason for the significantly increased NOx emission in waves in comparison with the calm water condition.

  • Network effects—do they matter for digital technologies diffusion?
    • Ewa Lechman
    • Helena Anacka
    2023 JOURNAL OF ORGANIZATIONAL CHANGE MANAGEMENT

    Purpose The main research target of this paper is to capture the network effects using the case of mobile cellular telephony, identified in European telecommunication markets, and its determinants enhancing the process of digital technologies diffusion. Design/methodology/approach This research relies on panel and dynamic panel regression analysis. The empirical sample covers 30 European countries, and the period for the analysis is set for 2000–2019. Findings This work contributes by examining the network effects identified on European telecommunication markets that drive the process of digital technologies diffusion, but it also extends the understanding of the latter by tracing major determinants of fast network expansion, e.g. prices of access to and use of, per capita income, urbanisation, population density, accessibility of fixed telephony infrastructure. The main findings support the initial supposition that the installed base strongly enhances diffusion of new technologies, while other factors, for example, prices, are not of prime importance. Research limitations/implications This research has certain managerial implications. The unveiled network effects driving adoption of technological innovations constitute a significant determinant of implementation of differentiation strategy by telecommunication companies. Due to network effects consumers' propensity to join the network is valued higher than the prices of services offered, which is crucial not only from the perspective of the company's pricing strategy but also enables telecommunication companies to introduce to the market new products and/or services concentrating on increasing its quality and usability rather than future prices. Originality/value This is the first work that empirically verifies the intercompanies and interpersonal diffusion of cellular telephony, hypothesising that this process relies on unique network effects.

  • Networking and Familiness as Factors Stimulating the Early Internationalization of High-Tech Firms
    • Nelly Daszkiewicz
    • Krzysztof Wach
    2023 Full text Inzinerine Ekonomika-Engineering Economics

    The problem of the role and importance of time in the process of firm’s internationalization belongs to the mainstream of international business research, as is the problem of the key role of high-tech firms operating across borders. The main goal of the paper is to understand how selected factors determine early internationalization of high-tech firms in Poland as an emerging market. The theoretical framework of the article is built on international entrepreneurship literature, supported by the network perspective and family firm theory. Then, the article focuses on the high-tech firms that become international through export or any other entry mode in the first three years of their life. A survey was conducted on the sample of 263 firms operating in high-tech industries in Poland. The results of our empirical studies show that high-tech firms functioning in networks and clusters are more likely to start their international expansion early. Moreover, family high-tech firms are less likely to internationalize early than non-family firms.

  • Net-zero carbon condition in wastewater treatment plants: A systematic review of mitigation strategies and challenges
    • Mojtaba Maktabifard
    • Hussein Al-Hazmi
    • Paulina Szulc
    • Mohammad Mousavizadegan
    • Xianbao Xu
    • Ewa Zaborowska
    • Xiang Li
    • Jacek Mąkinia
    2023 Full text RENEWABLE & SUSTAINABLE ENERGY REVIEWS

    The wastewater sector accounts for up to 7 and 10% of anthropogenic CH4 and N2O emissions, respectively. Nowadays wastewater treatment plants are going through a paradigm shift to approach a net-zero carbon condition. Numerous ongoing measures have taken place to identify the sources of greenhouse gases and minimize the carbon footprint. This paper systematically reviews all known practices leading towards net-zero carbon wastewater treatment. The greenhouse gas emissions from the wastewater sector are identified and carbon footprint quantification tools, such as reliable models and emission factors are compared. The direct process emissions can contribute to over 60% of the carbon footprint in wastewater treatment plants, while around 30% of the carbon footprint is due to energy-related indirect emissions. Therefore, greenhouse gas mitigation via process optimization and energy usage in wastewater treatment plants are comprehensively described. The implantation of novel nitrogen removal processes can reduce both greenhouse gas emissions and energy consumption. Other techniques such as source separation systems can potentially allow mitigation of N2O emissions by 60% while avoiding energy-intensive nitrogen fertilizer production. Nutrient recovery methods are another approach which offer negative value for the net carbon footprint. Recovering N2O for energy production is a promising method which can lead to both direct and indirect carbon footprint reductions. Ultimately, to achieve full decarbonization any remaining emissions need to be offset, including carbon footprint of chemicals usage and

  • Neural Graph Collaborative Filtering: Analysis of Possibilities on Diverse Datasets
    • Dariusz Kobiela
    • Jan Groth
    • Michał Sieczczyński
    • Rafał Wolniak
    • Krzysztof Pastuszak
    2023

    This paper continues the work by Wang et al. [17]. Its goal is to verify the robustness of the NGCF (Neural Graph Collaborative Filtering) technique by assessing its ability to generalize across different datasets. To achieve this, we first replicated the experiments conducted by Wang et al. [17] to ensure that their replication package is functional. We received sligthly better results for ndcg@20 and somewhat poorer results for recall@20, which may be due to the randomness. Afterward, we applied their framework to four additional datasets (NYC2014, TOKYO2014, Yelp2022, and MovieLens1M) and compared NGCF with HOP-Rec [18] and MF-BPR [14] as in the original study. Our results confirm that NGCF outperforms other models in terms of ndcg@20. However, when considering recall@20, either HOP-Rec or MF-BPR performed better on the new datasets. This finding suggests that NGCF may have been optimized for the datasets used in the original paper. Furthermore, we analyzed the models’ performance using recall@K and ndcg@K, where K was set to 1, 5, 10, and 40. The obtained results support our previous finding. The replication package for this paper can be found in our GitHub repository [1].

  • Neurocontrolled Car Speed System
    • Markiyan Nakonechnyi
    • Orest Ivakhiv
    • Dariusz Świsulski
    2023 Full text Journal of Automation, Mobile Robotics and Intelligent Systems - JAMRIS

    The features of the synthesis of neural controllers for the car speed control system are considered in this article. The task of synthesis is to determine the weight coefficients of neural networks that provide the implementation of proportional and proportional-integralderivative control laws. The synthesis of controllers is based on an approach that uses a reversed model of the standard. A model of the car speed control system with the use of permitting subsystems has been developed, with the help of the synthesized controller that is connected under certain specified conditions. With the iterative programming and mathematical modeling environment in MATLAB, and using the Simulink package, a structural scheme for controlling the speed of the car was constructed and simulated using synthesized neural controllers.

  • Neurodiversity and remote work in times of crisis: lessons for HR
    • Joanna Szulc
    • Frances-Louise McGregor
    • Emine Cakir
    2023 Full text Personnel Review

    Purpose The rich qualitative study builds on 11 semi-structured interviews with nine neurodivergent employees and two business professionals supportive of neurodiversity to understand the lived experiences of dealing with crisis in a remote working environment. Design/methodology/approach The purpose of the reported research is to understand how neurominorities experience remote working in the times of crisis and what the implications of this are for human resource (HR) professionals. Findings Moving to remote work resulted in a lack of routine, distractions and working long hours, which can all be difficult for line managers to monitor. Further problems with communication in a virtual environment and lack of understanding by others were found to be particularly burdensome to neurodivergent individuals. On the positive note, remote working in the times of crisis allowed for avoiding sensory overwhelm and was seen as an important step in creating a healthy work–life balance (WLB). Practical implications The findings of this study point HR practitioners' attention towards building a more neurodiversity friendly post-pandemic workplace and prompt employers to offer working arrangements, which better suit employees' domestic and personal circumstances. Originality/value This study addresses the lack of research on the impact of the Covid-19 crisis on neurominorities. In doing so, it answers recent calls to move away from universal HR as a route to positive employee outcomes and facilitates a more accurate reflection of organizational reality for disadvantaged members of society.

  • New Complementary Resonator for Permittivity- and Thickness-Based Dielectric Characterization
    • Tanveer Haq Ul
    • Sławomir Kozieł
    2023 Full text SENSORS

    The design of high-performance complementary meta-resonators for microwave sensors featur-ing high sensitivity and consistent evaluation of dielectric materials is challenging. This paper presents the design and implementation of a novel complementary resonator with high sensi-tivity for dielectric substrate characterization based on permittivity and thickness. A comple-mentary crossed arrow resonator (CCAR) is proposed and integrated with a fifty-ohm mi-crostrip transmission line. The CCAR's distinct geometry, which consists of crossed ar-row-shaped components, allows for implementing a resonator with exceptional sensitivity to changes in permittivity and thickness of the material under test (MUT). The CCAR's geometrical parameters are optimized to resonate at 15 GHz. The CCAR sensor's working principle is ex-plained using a lumped-element equivalent circuit. The optimized CCAR sensor is fabricated using LPKF protolaser on a 0.762-mm-thick dielectric substrate AD250C. The MUTs with dielec-tric permittivity ranging from 2.5 to 10.2 and thickness ranging from 0.5 mm to 1.9 mm are used to investigate the properties and calibrate the proposed CCAR sensor. A two-dimensional cali-bration surface is developed using an inverse regression modelling approach to ensure precise and reliable measurements. The proposed CCAR sensor is distinguished by its high sensitivity of 5.74 percent, low fabrication cost, and enhanced performance compared to state-of-the-art de-signs, making it a versatile instrument for dielectric characterization.

  • New Design of Axial Piston Pump with Displaced Swash Plate Axis of Rotation for Hydro-Mechanical Transmissions
    • Paweł Załuski
    • Piotr Patrosz
    • Marcin Bąk
    2023

    This paper presents a prototype design of an axial piston pump with displaced swash plate axis of rotation in two directions of discharge with electronic control intended for installation on a hydraulic-mechanical gearbox dedicated to working machines. The effect of displacement of the swash plate rotation axis on dead space volume and volumetric efficiency is presented. The construction and principle of operation of the capacity change mechanism and the delivery direction change mechanism are described. The design and hydraulic diagram of the pump are presented.

  • New empirical correlations for the viscosity of selected organic phase change materials
    • Janusz Cieśliński
    • Maciej Fabrykiewicz
    • Tomasz Wiśniewski
    • Michał Kubiś
    • Slawomir Smolen
    • Albrecht Eicke
    • Krzysztof Dutkowski
    • Małgorzata Głuszek-Czarnecka
    2023 Full text Archives of Thermodynamics

    Although there are many methods and instruments for measuring viscosity, it is still difficult to determine a reliable value of the dynamic viscosity of complex chemicals such as paraffins and fatty acids. This is due to the complex and heterogeneous structure of these compounds in the case of commercial products. On the other hand, the measuring instrument should be selected very carefully, including its measuring principle and measuring range. This paper presents results of viscosity measurements of three organic PCMs (phase change materials) obtained in four different research institutions. Commercial products: paraffin, myristic acid (97%) and mixture of palmitic acid (55%) and stearic acid (45%) were selected as PCMs. Four different viscometers, namely Fungilab V-Pad, Rheotest LK 2.2, Rheometer Anton Paar MCR 102, and Brookfield DV-II + Pro have been used to determine temperature dependent dynamic viscosity of the tested PCMs. Using a large database of present measurement results, correlations were developed to calculate the dynamic viscosity of fatty acids and paraffins, which predict the experimental data within a band of ±20%.