2022 - Repozytorium publikacji - Politechnika Gdańska

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Voltage profiles improvement in a power network with PV energy sources – results of a voltage regulator implementation
- Agata Szultka
- Seweryn Szultka
- Stanisław Czapp
- Robert Karolak
- Marcin Andrzejewski
- Jacek Kapitaniak
- Marcin Kulling
- Jan Bonk
2022 Pełny tekst ENERGIES
The constant increase in the number of photovoltaic (PV) energy sources in distribution networks is the cause of serious voltage problems. The networks built at least a dozen years ago are not provided for the installation of a large number of micro-sources. It happens that the previously properly functioning power networks are not able to provide to consumers power with the required parameters, after installing many PV sources. The problem relates especially to the level of voltage in the networks. This phenomenon sometimes occurs on sunny days, especially in summer. This paper discusses the use of a Low-Voltage Regulator (LVR-sys) in a selected rural distribution network with PV micro-sources. Measured voltage levels in this network, before application and after application of this regulator, are presented. The application of the regulator significantly improved voltage levels in the network and enabled these levels to be maintained within the normative range.
Volumetric incorporation of NV diamond emitters in nanostructured F2 glass magneto-optical fiber probes
- Adam Filipkowski
- Mariusz Mrózek
- Grzegorz Stępniewski
- Jakub Kierdaszuk
- Aneta Drabińska
- Tanvi Karpate
- Maciej Głowacki
- Mateusz Ficek
- Wojciech Gawlik
- Ryszard Buczyński
- Adam M. Wojciechowski
- Robert Bogdanowicz
- Mariusz Klimczak
2022 Pełny tekst CARBON
Integration of optically-active diamond particles with glass fibers is a powerful method of scaling diamond's magnetic sensing functionality. We propose a novel approach for the integration of diamond particles containing nitrogen-vacancy centers directly into the fiber core. The core is fabricated by stacking the preform from 790 soft glass canes, drawn from a single rod dip-coated with submicron diamond particles suspended in isopropyl alcohol. This enables manual control over the distribution of nanoscale features, here – the diamond particles across the optical fiber core. We verify this by mapping the diamond distribution in the core using confocal microscopy. The particles are separated longitudinally by 12–29 μm, while in the transverse plane a separation of approximately 1.5–2.2 μm is observed, corresponding to the individual cane diameter in the final fiber, and without significant agglomeration. The fiber's magnetic sensitivity is confirmed in optically detected magnetic resonance recorded with a coiled, 60-cm-long fiber sample with readout contrast of 1.3% limited by microwave antenna coverage. Moreover, magnetic-field dependence of the NV─ fluorescence intensity is demonstrated in the absence of microwaves magnetic, allowing magnetometric applications with a large (from 0 to 35 mT) B-field dynamic range.
W klimacie zmian
- Katarzyna Zielonko-Jung
2022 Architektura-Murator
Artykuł ma charakter popularnonaukowy. Dotyczy tendencji projektowania i budowania obiektów architektonicznych zgodnie z tendencjami środowiskowymi. Prezentuje ewolucje podejścia, która zaobserwować można w ciąg ostatnich 30 lat oraz zarysowuje tendencje na przyszłości.
Wage determination, Global Value Chains and role played by wage bargaining schemes: The case of Poland
- Dagmara Nikulin
- Anna Wolszczak
2022 Pełny tekst Economics and Business Review
This study examines the linkages between GVC involvement and wages in Poland given different wage bargaining schemes. The analysis is based on microdata from the European Structure of Earnings Survey for Poland combined with sectoral data from the World Input-Output Database. In particular, two measures of GVC involvement were used: the share of foreign value added (FVA) to export and the measure of traditional offshoring. The institutional settings are represented by the wage bargaining scheme which reflects the level at which the collective pay is agreed. The results show that despite the lack of a significant relationship between the sectoral involvement in GVC and the level of wages in Poland, on average workers covered by the collective pay agreement receive higher wages. Moreover, the wage-GVC nexus is conditioned on the type of pay agreements: the positive wage effect from national agreements is eliminated for a certain range of GVC intensity.
Walizka – nocny Bagaż…SEN, Galeria Szklarnia, Szkoła Filmowa w Łodzi
- Dominika Krechowicz
2022
Walizka – nocny Bagaż…SEN, Galeria Szklarnia, Szkoła Filmowa w Łodzi, 20.04 - 31.05.2022. Wystawa w ramach projektu "Walizka". http://www.szklarniaszkolyfilmowej.pl/wystawa/31 Koncepcja wystawy - prof. dr hab.Zbigniew Szot.
Wall of Love
- Krzysztof Wróblewski
2022
Swoistym nawiązaniem do monumentalnych realizacji Krzysztofa Wróblewskiego w przestrzeni publicznej jest obraz Wall of love. To pokryta mozaiką z trójkątów i rombów ściana z napisami love. Ale ściana miłości może być zarówno nawiązaniem do popkulturowego banału, w jaki zamieniło się słowo love albo alternatywą dla dzielących ludzi murów.
warsztaty "DOMEK LICHA: KASZUBSKIE SCHRONIENIE"
- Agnieszka Kurkowska
2022
Po krótkiej prelekcji o uwarunkowaniach kaszubskich przedstawiony został koncept postaci – kaszubskiego Licha do indywidualnej wizualizacji/ kreacji. Następnie każdy uczestnik/ uczestniczka stworzył plastyczny obraz Licha na przygotowanej karcie pracy i naszkicuje dla niego koncepcję domku – w lesie/ na polu/ nad jeziorem na Kaszubach. Wówczas uczestnicy zostali zapoznani z przygotowanymi dla nich materiałami – naturalnymi i ‘przemysłowo-produktowymi’ również ‘recyklingowymi’ poprzez wskazanie ich cech i walorów obiektywnych. Ostatnim – kluczowym – etapem warsztatów było stworzenie modelu domku dla Licha wpasowanego w realia kaszubskie i dopasowanego do tej postaci. Jedynym ograniczeniem pozostała dziecięca wyobraźnia.
Waste management in the mining industry of metals ores, coal, oil and natural gas - A review
- Szymon Kalisz
- Katarzyna Kibort
- Joanna Mioduska
- Marek Lieder
- Aleksandra Małachowska
2022 Pełny tekst JOURNAL OF ENVIRONMENTAL MANAGEMENT
Waste generated due to mining activity poses a serious issue due to the large amounts generated, even up to 65 billion tons per year, and is often associated with the risk posed by its storage and environmental management. This work aims to review waste management in the mining industry of metals ores, coal, oil and natural gas. It includes an analysis and discussion on the possibilities for reuse of certain types of wastes generated from mining activity, and discusses the benefits, disadvantages and the impact of waste management on the environment. The article presents current methods of waste management arising during the extraction and processing of raw materials and the threats resulting from its application. Furthermore, the potential methods of mining waste management are discussed through an in-depth characterization of the properties and composition of various types of rocks. The presented work addresses not only the issues of more sustainable management of waste from the mining industry, but also responds to the current efforts to implement the assumptions of a circular economy, which is aimed at closing the loop. The methods of recycling by-products and treating waste as a resource more and more often not only meet environmental expectations, but also become a legal requirement. In this respect, the presented work can serve as a valuable support in decision-making about waste management.
Waste tire rubber devulcanization technologies: State-of-the-art, limitations and future perspectives
- Paulina Wiśniewska
- Shifeng Wang
- Krzysztof Formela
2022 Pełny tekst WASTE MANAGEMENT
Waste tires management is a serious and global environmental problem. Therefore, searching for low-cost and industrial-scale applicable tire recycling methods is gaining more and more attention. Waste tire rubber is valuable source of secondary raw materials for the circular economy and current trends indicate that application of waste rubbers during manufacturing value-added products should increase in near future. Sustainable development of rubber devulcanization technologies and appropriate design of cradle-to-cradle loops for rubber goods are the most promising strategies for achieving a higher level of rubber recycling. This work presents the state-of-the-art in the patented waste tire rubber devulcanization technologies including dynamic desulfurization, reactive extrusion, microwave treatment, and also other less popular methods. Special attention was focused on the used components, rubber treatment conditions and static mechanical properties of reclaimed rubbers. Moreover, environmental aspects and limitations related to rubber devulcanization technologies implementation are also discussed. Our findings showed that reclaimed rubbers described in patents are characterized by higher tensile strength and elongation break (depending on devulcanization technology median: 16.6–19.0 MPa and 321–443%, respectively) compared to the literature data (median: 10.3 MPa and 309%) or commercial products (median: 6.8 MPa and 250%). The significant differences observed in performance properties of reclaimed rubbers resulted mainly from devulcanization efficiency related to waste tires composition or source and rubber treatment conditions. Considering environmental and economic aspects, reactive extrusion is the most promising method further development rubber devulcanization technologies.
Wavelet filtering of signals without using model functions
- Yurii Taranenko
- Nina Rizun
2022 Pełny tekst Radioelectronics and Communications Systems
The effective wavelet filtering of real signals is impossible without determining their shape. The shape of a real signal is related to its wavelet spectrum. For shape analysis, a continuous color wavelet spectrogram of signal level is often used. The disadvantage of continuous wavelet spectrogram is the complexity of analyzing a blurry color image. A real signal with additive noise strongly distorts the spectrogram based on continuous wavelet analysis compared to a pure signal. Therefore, the identification of a real signal by using a continuous color wavelet spectrogram is difficult. To solve this problem, for the first time, a comparative analysis of spectrograms of signals and correlation matrices is carried out. The spectrograms of signals are obtained based on continuous wavelet transformation in the form of images with areas of different colors of variable intensity. To filter the identified signal, a recursive algorithm was used, consisting of successive iterations of the filtering parameters in order to reduce the error. The study of the algorithm on groups of twenty special signals showed a decrease in the number of iterations in comparison with known methods. Correlation matrices are computed by using mathematical functions of the coefficients of discrete wavelet spectra
Wdrożenie systemu MEC w sieciach WLAN: Moduł współpracy serwera MEC z siecią dostępową WLAN
- Michał Hoeft
- Krzysztof Gierłowski
- Józef Woźniak
- Wojciech Gumiński
- Krzysztof Nowicki
- Jacek Rak
2022 Pełny tekst Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne
W artykule zaprezentowano zasady funkcjonowania modułu współpracy sieci dostępowych WLAN z serwerem MEC oraz pozostałymi komponentami ekosystemu, budowanego w ramach projektu SyMEC. Zaproponowana architektura pozwala na ujednolicenie dostępnej funkcjonalności oraz komunikację zewnętrznych aplikacji z podmodułami odpowiedzialnymi za zbieranie i przekazywanie informacji o sieci dostępowej. Jako przykładową aplikację zademonstrowano wizualizację szeregu parametrów sieci dostępowej WLAN.
Weather Routing System Architecture Using Onboard Data Collection and Route Optimisation
- Joanna Szłapczyńska
- Roberto Vettor
- Rafal Szlapczynski
- Mirosław Łącki
- Marcin Życzkowski
- Miguel A. Hinostroza
- Fernando P. Santos
- Wojciech Tycholiz
- Carlos Guedes Soares
2022 Pełny tekst Polish Maritime Research
This paper describes the architecture of a weather routing system consisting of two key elements: onboard monitoring and route optimiser sub-systems. The former is responsible for collecting various onboard measurements, such as current ship position or ship motion variables. These data, when gathered and processed, are then used for fine-tuning a ship model. The model, together with weather forecasts, is utilised by a multi-objective route optimiser to estimate forecasted ship responses during the voyage. The route optimiser has been developed in a client-server architecture to reallocate all necessary high-tech resources to the server side and keep the client software as simple and light as possible. The system also includes a module responsible for optimising transmission costs, to reduce onboard transmission during the voyage. The entire solution has been deployed onboard the demonstrator ship ‘Monte da Guia’ and tested during its operations at sea.
Weighted 2-sections and hypergraph reconstruction
- Robert Janczewski
- Paweł Obszarski
- Krzysztof Turowski
2022 THEORETICAL COMPUTER SCIENCE
In the paper we introduce the notion of weighted 2-sections of hypergraphs with integer weights and study the following hypergraph reconstruction problems: (1) Given a weighted graph , is there a hypergraph H such that is its weighted 2-section? (2) Given a weighted 2-section , find a hypergraph H such that is its weighted 2-section. We show that (1) is NP-hard even if G is a complete graph or integer weights w does not exceed 2. Next, we show that (2) is solvable in linear time if G is a partial 2-tree, 2-degenerated or its degree does not exceed 4.
What is in a name: Defining “high entropy” oxides
- Matthew Brahlek
- Maria Gazda
- Veerle Keppens
- Alessandro R. Mazza
- Scott J. McCormack
- Aleksandra Mielewczyk-Gryń
- Brianna Musico
- Katharine Page
- Christina M. Rost
- Susan B. Sinnott
- Cormac Toher
- Thomas Ward
- Ayako Yamamoto
2022 Pełny tekst APL Materials
ABSTRACT High entropy oxides are emerging as an exciting new avenue to design highly tailored functional behaviors that have no traditional counterparts. Study and application of these materials are bringing together scientists and engineers from physics, chemistry, and materials science. The diversity of each of these disciplines comes with perspectives and jargon that may be confusing to those outside of the individual fields, which can result in miscommunication of important aspects of research. In this Perspective, we provide examples of research and characterization taken from these different fields to provide a framework for classifying the differences between compositionally complex oxides, high entropy oxides, and entropy stabilized oxides, which is intended to bring a common language to this emerging area. We highlight the critical importance of understanding a material’s crystallinity, composition, and mixing length scales in determining its true definition.
What Skills for Multi-Partner Open Innovation Projects? Open Innovation Competence Profile in a Cluster Ecosystem Context
- Marita Mcphillips
- Tatjana Nikitina
- Silke Tegtmeier
- Michał Wójcik
2022 Pełny tekst Sustainability
Industry 4.0 and the turbulent environment have rendered increasing interest in open inno- vation that extends from the bilateral transmission of expertise to multilateral platform collaborations. Open innovation ventures are seen as intricate collaborations that require the commitment of numer- ous partners during the lifetime of the project. In order to examine the specific competence of open innovation teams, we set the research question as follows: What individual competencies facilitate the exchange of knowledge in open innovation projects? We explored the theoretical framework of open innovation and collected information from a nation-wide, cross-industrial set of OI projects from three high-performing clusters, facilitating a total of 102 OI projects to identify open innovation competence dimensions, thus creating a novel profile. The outcomes showed that competencies facilitate the exchange of knowledge in open innovation ventures in distinct ways. Our findings showed that open innovation competence can be captured using a profile with the dimensions of creativity, entrepreneurship, communication and networking, open-minded thinking, risk-taking, and self-efficacy in digital skills. These dimensions of the open innovation competence profile are necessary for cluster project set-up. This analysis demonstrated that components of the open innova- tion competence profile could be paramount in understanding the underlying factors in the success of collaborative innovation projects.
Whether Carbon Nanotubes Are Capable, Promising, and Safe for Their Application in Nervous System Regeneration. Some Critical Remarks and Research Strategies
- Andrzej Zieliński
- Beata Majkowska-Marzec
2022 Pełny tekst Coatings
Carbon nanotubes are applied in or considered for different fields of medicine. Among them is the regeneration or rebuilding of nervous system components, which still lack substantial progress; this field is supported by carbon nanotubes to a great extent as the principal material. The limited research on this issue has involved PU/silk/MWCNTs, PCL/silk/MWCNTs, PCL/PGS/CNTs, chitin/CNTs, PGF/CNTs, CNTs/PGFs/PLDLA,MWCNTs chitosan,MWCNTs/PPy, PLA/MWCNTs, PU/PAA/MWCNts, GelMA/SACNTs, and CNTs alone, which have been subjected to different surface modifications and applied in the form of solid materials or scaffolds that are degradable or nondegradable. So far, these attempts have shown that the use of surface-modifiedMWCNTs is a promising way to improve the functions of nervous systems as a whole, even though some drawbacks, such as the potential cytotoxicity or the weak adhesion of CNTs to other components, may appear and be eliminated by their proper functionalization. The present review presents an idea of a nonbiodegradable scaffold structure composed of a chosen conductive polymer that is able to create a scaffold structure, a selected nanocarbon form (withMWCNTs as the first candidate), and a corrosion-resistant metal as a conductor. Other substances are also considered for their ability to increase the mechanical strength and adhesion of CNTs and their biological and electrical properties. The novelty of this approach is in the simultaneous use of nanocarbon and conductive metallic fibers in a polymer scaffold structure.
Which Curve Fits Best: Fitting ROC Curve Models to Empirical Credit-Scoring Data
- Błażej Kochański
2022 Pełny tekst Risks
In the practice of credit-risk management, the models for receiver operating characteristic (ROC) curves are helpful in describing the shape of an ROC curve, estimating the discriminatory power of a scorecard, and generating ROC curves without underlying data. The primary purpose of this study is to review the ROC curve models proposed in the literature, primarily in biostatistics, and to fit them to actual credit-scoring ROC data in order to determine which models could be used in credit-risk-management practice. We list several theoretical models for an ROC curve and describe them in the credit-scoring context. The model list includes the binormal, bigamma, bibeta, bilogistic, power, and bifractal curves. The models are then tested against empirical credit-scoring ROC data from publicly available presentations and papers, as well as from European retail lending institutions. Except for the power curve, all the presented models fit the data quite well. However, based on the results and other favourable properties, it is suggested that the binormal curve is the preferred choice for modelling credit-scoring ROC curves.
Which transport policies increase physical activity of the whole of society? A systematic review
- Joanna Żukowska
- Anna Gobis
- Piotr Krajewski
- Agnieszka Morawiak
- Romanika Okraszewska
- Catherine Woods
- Kevin Volf
- Liam Kelly
- Peter Gelius
- Sven Messing
- Sarah Forberger
- Jeroen Lakerveld
- Nicole den Braver
- Enrique García Bengoechea
2022 Pełny tekst Journal of Transport & Health
Purpose: There is strong evidence of the links between car-dependence and the physical inactivity pandemic. Physical inactivity accounts for 6–10% of major non-communicable diseases. Research consistently shows that unlike passive transport, active transport is associated with higher total daily physical activity (PA). While there are public policies that support PA in transport and, as a result, overall PA levels, the specific quantitative effect of such policies on PA behaviour has not been sufficiently investigated. The aim of this systematic review is to determine the level and typeof evidence for policies in the area of transport that contribute to higher PA levels of the whole of society. Methods: Six databases (MEDLINE (Ebsco), SportDiscus, Cinahl, Cochrane library, Web of Science,and Scopus) were searched for key concepts of policy, transport, evaluation and PA. Methodological quality was assessed using standardized tools. The strength of the evidence of policy impact was described based on pre-determined categories of positive, negative, inconclusive or untested. Results: 17 of 2549 studies were included in the data synthesis. The authors identified three main transport policy areas with 51 individual policy actions that had a direct or indirect effect on PA.These were: convenient transport infrastructure development, active travel promotion, and shift of transport mode. More than half of the policy actions identified had a positive effect on PA.Study quality ratings were moderate to good.Conclusions: PA levels can be increased by implementing policies that provide convenient, safe, and connected walking and cycling infrastructures, promote active travel and give strong support to public transport. There is also clear evidence that active travel policies work best when implemented in a comprehensive way. This may include infrastructure and facility improvements as well as educational programmes to achieve substantial shifts towards active modes of travel.
Who is who w temacie zanieczyszczenia światłem sztucznym na świecie i w Polsce
- Karolina Zielińska-Dąbkowska
2022
Jak dowodzą liczne badania na temat zanieczyszczenia światłem sztucznym i jego wpływem na obserwacje astronomiczne, środowisko naturalne, w tym florę i faunę oraz ludzi, ów problem stał się istotny i od pewnego czasu angażujący naukowców oraz opinię publiczną. W niniejszej pracy, na podstawie metody wywiadu, analizy i krytyki piśmiennictwa, a także doświadczeń własnych, przebadano, jakie są najbardziej aktywne stowarzyszenia, organizacje oraz ośrodki badawcze działające w zakresie zanieczyszczenia światłem sztucznym na świecie i w Polsce, które przyczyniają się do redukcji tego szkodliwego zjawiska.
Wideband Highly-Selective Bandpass Filtering Branch-Line Coupler
- Rusan Barik
- Sławomir Kozieł
- Stanisław Szczepański
2022 Pełny tekst IEEE Access
This paper presents a novel design of a wideband highly-selective bandpass filtering branch-line coupler (FBLC). By integrating a coupled microstrip line, and an open-ended stub at each port of a single-section BLC, bandpass filtering characteristics with excellent selectivity and broad operating bandwidth have been achieved. The proposed circuit has been verified through EM simulations and physical measurements of the fabricated prototype. Experimental results demonstrate over 71-percent fractional bandwidth (2.25 GHz to 4.74 GHz) with a power imbalance lower than 0.5 dB. At the same time, the measured return loss and isolation are better than 15dB with the phase imbalance of 5 ± 5°. This level of performance, especially in terms of bandwidth and selectivity, has not been reported in the literature thus far.