2023 - Repozytorium publikacji - Politechnika Gdańska

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Topography measurement methods evaluation for entire bending-fatigued fracture surfaces of specimens obtained by explosive welding
- Przemysław Podulka
- Wojciech Macek
- Dariusz Rozumek
- Krzysztof Żak
- Ricardo Branco
2023 Pełny tekst MEASUREMENT
In this paper, the methods of compensation of differences in the results of entire bending-fatigued fracture surface topographies were presented. The roughness evaluation was performed with a focus variation microscope and confocal surface topography measurement techniques. The differences in the ISO 25178 roughness parameters were investigated and procedures for their compensation were studied. It was found that various types of optical measurements can cause differences in the errors occurring in the measurement process, such as outliers, and noise. The reduction of differences in the various optical roughness measurements can be attained when measurement errors are compensated. For this study, the applications of general procedures available in commercial software can be suitable for improvements of the roughness measurement results, such as raw data thresholding technique, digital filtering (S-filter), power spectral density, and autocorrelation function analyses. The validation of measurement techniques was proposed for areal and profile studies, including analysis of differences in the calculation areal ISO 25178 roughness parameters.
Topological-numerical analysis of a two-dimensional discrete neuron model
- Paweł Pilarczyk
- Justyna Signerska-Rynkowska
- Grzegorz Graff
2023 Pełny tekst CHAOS
We conduct computer-assisted analysis of a two-dimensional model of a neuron introduced by Chialvo in 1995 [Chaos, Solitons Fractals 5, 461–479]. We apply the method of rigorous analysis of global dynamics based on a set-oriented topological approach, introduced by Arai et al. in 2009 [SIAM J. Appl. Dyn. Syst. 8, 757–789] and improved and expanded afterward. Additionally, we introduce a new algorithm to analyze the return times inside a chain recurrent set. Based on this analysis, together with the information on the size of the chain recurrent set, we develop a new method that allows one to determine subsets of parameters for which chaotic dynamics may appear. This approach can be applied to a variety of dynamical systems, and we discuss some of its practical aspects. In the last three decades, various discrete models of a single neuron were introduced, aimed at reflecting the dynamics of neural processes. Unfortunately, analytical methods offer limited insight into the nature of some phenomena encountered by such models. In this paper, we study the classical multi-parameter Chialvo model by means of a novel topological method that uses set-oriented rigorous numerics combined with computational topology. We enrich the existing tools with a new approach that we call finite resolution recurrence. We obtain a comprehensive picture of global dynamics of the model, and we reveal its bifurcation structure. We combine the recurrence analysis with machine learning methods in order to detect parameter ranges that yield chaotic behavior.
Total impact of oxidative stress genes on cardiovascular events—a 7-year follow-up study
- Milena Racis
- Anna Stanisławska-Sachadyn
- Wojciech Sobiczewski
- Marcin Wirtwein
- Michał Krzemiński
- Andrzej Rynkiewicz
- Bartosz Wasąg
- Miłosz Jaguszewski
- Marcin Gruchała
2023 Pełny tekst JOURNAL OF APPLIED GENETICS
Cardiovascular (CV) events are the number one cause of lifetime disability and deaths worldwide. It is well known that traditional risk factors do not fully correlate with clinical outcomes; therefore, searching for other markers that would explain CV events occurrence seems essential. Of importance, one of the main factors at the origin of CV events is oxidative stress, causing inflammation and atherosclerotic plaque instability. Therefore the present study was conducted to evaluate eight carefully selected genetic polymorphisms related to oxidative stress as risk modifiers for CV events. A cohort of 1020 patients with coronary atherosclerosis was analysed in a 7-year follow-up observational study. The following endpoints were assessed: CV death, myocardial infarction (MI) and a combined endpoint of CV death/MI/stroke. Our results show that single polymorphisms are not significant cardiovascular disease risk factors, but genetic risk score (GRS), defined as the accumulation of our eight studied polymorphisms, was significantly associated with the three. Specifically, low GRS was associated with a higher risk of CV death, MI and CV death/MI/stroke. In conclusion, when regarding CV events, GRS investigated here can become clinically meaningful and undoubtedly adds to the knowledge in stratifying the risk of CV events.
Toward Safe and Efficient Recovery of Gas Munitions Dumped at Sea
- Lech Rowiński
- Thanh Hai Truong
- Phuoc Quy Phong Nguyen
2023 Pełny tekst Polish Maritime Research
The proposal of a system for the safe recovery of unexploded ordnance (UXO), chemical weapons (CW) and chemicalwarfare agents (CWA) dumped at sea mainly after WWI and WWII is described in this work. The proposed solutionaddresses the tasks required to neutralise thousands of tons of dumped material and the currently available solutionsand proposed ideas. Requirements concerning the features of a recovery system are defined and scrutinised, thesebeing intended to ensure the safety of this phase of the UXO/CW neutralisation process. To meet this requirement,the concept of a remotely operated, two-component working size underwater vehicle is proposed, supplemented bya properly sized and outfitted surface platform that is an important part of the recovery system. Finally, the basiccomponents of the proposed system configuration are characterised, together with their functions during the recoveryof dangerous CWA-related objects
Towards a Framework for Context Awareness Based on Textual Process Data
- Aleksandra Revina
- Nina Rizun
- Aksu Ünal
2023
Context awareness is critical for the successful execution of processes. In the abundance of business process management (BPM) research, frameworks exclusively devoted to extracting context from textual process data are scarce. With the deluge of textual data and its increasing value for organizations, it be-comes essential to employ relevant text analytics techniques to increase the awareness of business process (BP) workers, which is important for BP execu-tion. Following the design science research guidelines, the present paper ad-dresses this demand by developing a framework for context awareness based on textual process data using a well-established layered BPM context model. This framework combines and maps various text analytics techniques to the layers of the context model, aiming to increase the context awareness of BP workers and facilitate informed decision-making. The framework is conceptualized in an IT ticket processing case study. The findings show that contextual information ob-tained using our framework enriches the awareness of BP workers regarding the process instance urgency, complexity, and upcoming tasks and assists in making decisions in terms of these aspects
Towards a Universal Model of Engineering Change Management
- Jakub Tryczak
- Anna Lis
- Paweł Ziemiański
- Jacek Czyżewicz
2023 Pełny tekst Journal of the Knowledge Economy
The paper deals with the issue of engineering change management (ECM). ECM has received much less attention in the literature than general change management. Moreover, due to their specifics (complexity and multifaceted nature), hitherto developed ECM models are difficult to implement in companies. The paper aims to develop a simplified, universal, and hence easily applicable model of ECM. We based our assumptions on a case study of a manufacturing company with low-volume production, representing a high-mix type, posing the following research question: how to improve the ECM process to make it simpler and more quickly adaptable in companies with the analyzed type of production when compared to the existing models? To answer this question, an exploratory qualitative study was conducted in late 2021/early 2022 using in-depth personal interviews. The research sample included 31 employees involved in ECM processes. The primary technique for analyzing and interpreting the data was conventional qualitative content analysis. The study identified gaps and bottlenecks in the existing ECM model. On this basis, a proposal for a new ECM model was developed, distinguished by its simplicity and versatility (it can be implemented in companies operating in various industries). Particular emphasis was placed on ensuring the flow of information and circulation of technical documentation between the departments involved and clarifying the role of the change administrator. The paper sheds new light on how to implement engineering changes in organizations and has considerable application value.
Towards High-Value Datasets Determination for Data-Driven Development: A Systematic Literature Review
- Anastasija Nikiforova
- Nina Rizun
- Magdalena Ciesielska
- Charalampos Harris Alexopoulos
- Andrea Miletić
2023
Open government data (OGD) is seen as a political and socio-economic phenomenon that promises to promote civic engagement and stimulate public sector innovations in various areas of public life. To bring the expected benefits, data must be reused and transformed into value-added products or services. This, in turn, sets another precondition for data that are expected to not only be available and comply with open data principles, but also be of value, i.e., of interest for reuse by the end-user. This refers to the notion of “high-value dataset” (HVD), recognized by the European Data Portal as a key trend in the OGD area in 2022. While there is progress in this direction, e.g., the Open Data Directive, incl. identifying 6 key categories, a list of HVDs and arrangements for their publication and re-use, they can be seen as “core” / “base” datasets aimed at increasing interoperability of public sector data with a high priority, contributing to the development of a more mature OGD initiative. Depending on the specifics of a region and country - geographical location, social, environmental, economic issues, cultural characteristics, (under)developed sectors and market specificities, more datasets can be recognized as of high value for a particular country. However, there is no standardized approach to assist chief data officers in this, and there is a clear lack of conceptualizations for the determination of HVD and systematic oversight. In this paper, we present a systematic review of existing literature on HVD determination, which is expected to form an initial knowledge base for this process, including used approaches and indicators to de-termine them, data, stakeholders
Towards large-scale application of nanoporous materials in membranes for separation of energy-relevant gas mixtures
- Roberto Castro Munoz
- Kumar V. Agrawal
- Zhiping Lai
- Joaquín Coronas
2023 SEPARATION AND PURIFICATION TECHNOLOGY
Membranes containing nanoporous materials (such as zeolites, metal–organic materials and 2D materials such as graphene derivatives) may allow more efficient separation of gas mixtures relevant to emerging energy technologies. For example, such membranes could be applied in the separation of gases containing mixtures of carbon dioxide (CO2) and hydrogen (H2). However, these membranes are currently at a relatively low technology readiness level. Hence, here we review the opportunities and challenges of applying these porous materials in practice and at scale in membranes for possible commercialization. Besides, we highlight the necessity of improvements in the porosity control of 2D materials and the decrease in the selective membrane skin layer when adapted in asymmetric membranes. In this latter point, we declare the main limitations of porous supports, as well as the further developments needed in the gutter layer and supports. Additionally, we review the main membrane module configurations and process requirements, declaring the most suitable configurations (e.g. spiral wound and hollow fiber modules) at scale with promising future for highly intensified membrane modules for application in CO2 and H2 separations. Finally, apart from the conclusions derived from this review, we outline useful recommendations for the researchers in the field.
Towards more inclusive qualitative research: the practice of interviewing neurominorities
- Joanna Szulc
2023 Pełny tekst Labour & Industry-A Journal of the Social and Economic Relations of Work
Management scholars increasingly focus their efforts on the development of neurodivergent human capital and the promotion of inclusive employment and decent work. However, it may be argued that existing research still suffers from the lack of a comprehensive appreciation of what neurominorities may find difficult in the research process or how they interpret what the researchers are doing. In the light of only fragmented advice about how qualitative research with neurominorities should be conducted, this short research note aims to promote effective and inclusive qualitative research that ensures that the specific needs of neurominorities are taken into account throughout the entire research pathway. Building on the existing literature and my own reflections, I call on qualitative management scholars to engage in research that is truly impactful at multiple levels by re-considering how they make impact on those who traditionally have less voice or power.
Towards Robust Identification of Nonstationary Systems
- Artur Gańcza
- Marta Chełkowska
- Natalia Kleinschmidt
2023
The article proposes a fast, two-stage method for the identification of nonstationary systems. The method uses iterative reweighting to robustify the identification process against the outliers in the measurement noise and against the numerical errors that may occur at the first stage of identification. We also propose an adaptive algorithm to optimize the values of the hyperparameters that are crucial for this new method.
TQM jako podstawa przemian projakościowych w szkolnictwie wyższym
- Piotr Grudowski
2023 Pełny tekst Problemy Jakości
Cel: Przedstawienie najważniejszych wniosków płynących z badań prowadzonych w różnych regionach świata oraz obserwacji własnych prezentujących wpływ koncepcji TQM na efekty zarządzania w instytucjach szkolnictwa wyższego. Projekt badania/metodyka badawcza/koncepcja: Wykorzystano studium literatury wg zaleceń metodycznych J. Creswella. Wnioski płynące z rozważań oparto, przede wszystkim, na podejściu indukcyjnym. Wyniki/wnioski: Przedstawiono czynniki wspierające wprowadzanie TQM w szkołach wyższych. Wskazano także typowe problemy spotykane w związku z wprowadzaniem TQM oraz koncepcji pokrewnych w uczelniach. Określono warunki skutecznej integracji inicjatyw projakościowych w uczelniach z koncepcją Jakości 4.0 i Społeczeństwa 5.0. Ograniczenia: Wybrano jedynie najważniejsze – zdaniem autora – czynniki wspierające i problemy dotyczące aplikacji TQM w szkołach wyższych. Wnioski ograniczają się do wyników badań dostępnych w ramach studium literatury światowej i doświadczeń własnych autora. Zastosowanie praktyczne: Wskazane wnioski z badań oraz praktycznych doświadczeń mogą być uwzględnione przez personel uczelni odpowiedzialny za doskonalenie procesów w ramach konkretnych projektów. Oryginalność/wartość poznawcza: Artykuł pełni rolę porządkującą, jeśli chodzi o teorię i praktykę dotyczące roli koncepcji TQM w doskonaleniu systemów zarządzania szkół wyższych, wskazując czynniki, które powinny być przedmiotem dociekań w tym zakresie.
Trade of the European Union with the Post-Soviet Republics of Central Asia in the Second Decade of the 21st Century
- Krystyna Gomółka
2023 Studia Wschodnioeuropejskie
.The article presents the European Union's trade with five Central Asian countries: Kazakhstan, Turkmenistan, Tajikistan, Kigistan and Uzbekistan in the two decades of the 21st century.
Transformation of bimetallic Ag–Cu thin films into plasmonically active composite nanostructures
- Marcin Łapiński
- Robert Kozioł
- Wojciech Skubida
- Piotr Winiarz
- Rowa Mahjoub Yahia Elhassan
- Wojciech Sadowski
- Barbara Kościelska
2023 Pełny tekst Scientific Reports
Formation of plasmonically active silver, copper and composite silver-copper nanostructures were studied in this paper. Metallic nanostructures were fabricated by thermal disintegration, so called dewetting, of the thin films in an argon atmosphere. The formation process of the nanostructures was in-situ observed by a novel method, based on resistance measurements. The influence of the material and thickness of the initial thin film on temperature of their disintegration was investigated. Electrical measurements were validated by scanning electron microscopy observations, while metallic the behavior of nanostructures was studied by XPS method. The formation of silver-copper nanocomposite structures was confirmed by UV–vis spectroscopy. Plasmon resonance with two characteristic peaks for nanocomposite structures was observed.
Transformator z tyrystorowym przełącznikiem zaczepów jako obiekt sterowania
- Piotr Sępka
- Maciej Brzycki
- Artur Cichowski
2023 Pełny tekst Przegląd Elektrotechniczny
Artykuł jest wynikiem realizacji studenckiego projektu, którego obiektem badań były transformatory z tyrystorowym podobciążeniowym przełącznikiem zaczepów (PPZ), znajdujące się w Laboratorium LINTE^2. Projekt obejmował analizę stanów przejściowych zachodzących podczas przełączania tyrystorów. W referacie przedstawiono opracowany model tyrystorowego przełącznika zaczepów wraz z wynikami badań symulacyjnych.
Transport of dangerous goods by rail, and threats to the subsoil of the railway surface in the event of a disaster
- Eligiusz Mieloszyk
- Anita Milewska
- Mariusz Wyroślak
2023 Pełny tekst AIP Conference Proceedings
In Poland, in 2020, the mass of dangerous goods (loads) transported by rail was 26 151.06 thousand tone. This translated into the performance of 8 899 691.89 thousand tone - km of transport performance. In 2020, these figures accounted for 11.72% of the weight of goods transported by rail. The situation is similar in other countries around the world. With such a large volume of transport of dangerous goods by rail, there is a high risk of a railway disaster involving hazardous materials. The effects of such a catastrophe affect the ground surface of the railway track and groundwater. For modeling, generalized dynamical systems are used. These are mathematical models of real systems describing the relationships between the so-called input ⃗ and output (response) of a dynamical system. In the case of the railway disasters discussed here, they determine the functions showing the way the effects of the disaster spread in the subsoil of the railway track and show the properties of these functions. For this modeling, a non-classical calculus of operators is used that generates generalized dynamical systems, as the phenomenon of spreading the effects of a catastrophe in the ground is a complex dynamic process. It can be either slow or abrupt. This has been taken into account in the process analysis. It has been shown that the occurrence of a disaster, including the one involving hazardous materials, is influenced by the reliability of the railway line and its components, as well as the reliability of the subsoil. It was indicated that the effects of a disaster involving hazardous materials affect the discussed reliability. Determining the function of unreliability, reliability and intensity of damage to the subsoil is helpful in determining the methods of restoring the subsoil to its original (initial) operating parameters.
TRAVELLING WAVES FOR LOW–GRADE GLIOMA GROWTH AND RESPONSE TO A CHEMOTHERAPY MODEL
- Agnieszka Bartłomiejczyk
- Marek Bodnar
- Magdalena U. Bogdańska
- Monika Piotrowska
2023 Pełny tekst International Journal of Applied Mathematics and Computer Science
Low-grade gliomas (LGGs) are primary brain tumours which evolve very slowly in time, but inevitably cause patient death. In this paper, we consider a PDE version of the previously proposed ODE model that describes the changes in the densities of functionally alive LGGs cells and cells that are irreversibly damaged by chemotherapy treatment. Besides the basic mathematical properties of the model, we study the possibility of the existence of travelling wave solutions in the framework of Fenichel’s invariant manifold theory. The estimates of the minimum speeds of the travelling wave solutions are provided. The obtained analytical results are illustrated by numerical simulations.
Trends in Locally Balanced Energy Systems without the Use of Fossil Fuels: A Review
- Łukasz Mazur
- Sławomir Cieślik
- Stanisław Czapp
2023 Pełny tekst ENERGIES
In recent years, the idea of the operation of energy systems (power systems, heating systems) has changed significantly. This paper is an overview of locally balanced energy systems without the use of fossil fuels. The paper justifies the concept of local energy balancing in a new energy system that does not use fossil fuels (coal, natural gas, and crude oil), based on European Union guidelines and formal documents as well as the literature on the subject. In this context, the issue of local energy self-sufficiency, utilizing renewable energy sources, as well as the concept of local smart grids based on innovative market mechanisms are raised. Attention is also paid to technical issues with regard to locally balanced energy systems, in particular photovoltaic sources and energy storage. Challenges related to the use of electrical protection in networks with many sources of energy are described. In such networks, the power flow is not in one direction only. Moreover, the selection of protections is problematic due to the distribution of short-circuit currents. Additionally, earth fault currents in such networks may be distorted, and this negatively affects the operation of residual current devices. The basic nomenclature describing locally balanced systems has been sorted out as well. Finally, possible future research paths in the field of creating locally balanced systems without the use of fossil fuels are presented.
Triplet Formation and Triplet‐Triplet Annihilation Upconversion in Iodine Substituted Non‐Orthogonal BODIPY‐Perylene Dyads
- Keshav Kumar Jha
- Amrutha Prabhakaran
- Rengel Cane Sia
- Ruben Arturo Arellano-Reyes
- Nirod Kumar Sarangi
- Tingxiang Yang
- Krishan Kumar
- Stephan Kupfer
- Julien Guthmuller
- Tia E. Keyes
- Benjamin Dietzek-Ivanšić
2023 Pełny tekst ChemPhotoChem
BODIPY-perylene dyads have emerged as useful metal free sensitizers for triplet-triplet annihilation upconversion (TTAUC), these dyads are capable of efficient triplet generation via spinorbit charge transfer intersystem crossing (SOCT-ISC). This important route to triplet formation requires dyads in which two moieties are oriented perpendicular to each other. In this contribution, we give a deeper insight on the behavior of recently reported BODIPY-perylene dyads, where BODIPY-perylene dihedral exhibits a non-orthogonal dyad geometry. The intersystem crossing of BODIPY-perylene dyads with and without iodine are investigated using femtosecond transient absorption (fs-TA) and nanosecond transient absorption (ns-TA) spectroscopy. The concurrent decay of the singlet charge transfer state (1CT) and rise of triplet states in both the iodinated and non-iodinated dyads confirms the SOCT-ISC as the main intersystem crossing pathway despite the altered geometry of the dyads. The presence of an iodine atom on the BODIPY-moiety enables intersystem crossing 2.6-times faster and provides a higher triplet yield with respect to dyad without iodine. The upconversion quantum yield is 8.4-times higher in the sample containing iodinated dyad as sensitizer and perylene as annihilator. The triplet-triplet energy transfer rate (kTTET) is ~8×10^8 M-1.s-1 for both iodinated and noniodinated sensitizer containing TTAUC systems in 1,4-dioxane.
Trójfazowy 4-gałęziowy falownik SiC w napędzie z wysokoobrotowym silnikiem indukcyjnym
- Marek Adamowicz
- Sebastian Giziewski
- Zbigniew Krzemiński
2023 Pełny tekst Przegląd Elektrotechniczny
Zastosowanie tranzystorów SiC w falownikach napędów wysokoobrotowych powoduje nowe wyzwania,szczególnie odnośnie generowanego w falowniku napięcia common mode (CM) o wysokiej częstotliwości. Wysokoczęstotliwościowe napięcie CM wchodzi w interakcję z pojemnościami pasożytniczymi falownika, kabla i silnika wymuszając przepływ prądów CM, które są źródłem strat w filtrach pasywnych oraz powodują zakłócenia pomiarów prądów, nieakceptowalne z punktu widzenia działania przekształtnika. Ze wzrostem częstotliwości rośnie poziom emisji zaburzeń elektromagnetycznych spowodowany rezonowaniem obwodu CM, a tym samym niekorzystnie rośnie masa, gabaryt i koszt dławików CM. W referacie zaproponowano zastosowanie 4-gałęziowego falownika SiC z metodą sterowania zapewniającą eliminację napięcia CM celem poprawy właściwości napędu wysokoobrotowego.
Truss imperfections in the design of bar and diaphragm bracing systems
- Natalia Korcz-Konkol
- Piotr Iwicki
2023 Pełny tekst JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH
In the article three variants of roof bracing were considered: bar bracing, diaphragm bracing and the combination of bar and diaphragm bracing. Different analytical and numerical ways of taking into account the imperfections of the truss girder were compared. The entire 3D model of the roof (shell and beam elements with the eccentricities taken into account) was analysed numerically. Selected stressed-skin aspects were considered. Stabilizing forces in the purlins and forces in bracing elements (bar and/or diaphragm bracing, connections) were observed. The importance of the imperfection issues (e.g. shape of the imperfection, method of including imperfection, wind forces) was evaluated numerically to indicate the key points in the design procedure. The biggest forces in purlins occurred for “nonstandard” shape of the imperfection. On the other hand, in case of bracing elements, when wind forces were taken into consideration, “standard” approach of including the imperfection was safe approximation. Moreover, the diaphragm took over significant part of the bracing forces, however the distribution of the forces depended strongly on the flexibility of the bracing and purlin/truss connection.