2022 - Repozytorium publikacji - Politechnika Gdańska

Pokaż publikacje z roku

Publikacje z roku 2022

Pokaż wszystkie

Prediction of Weld Deformations by Numerical Methods - Review
- Janusz Kozak
2022 Pełny tekst Polish Maritime Research
The welding process is the basic technique of joining in the shipbuilding industry. This method generates welding distortions that cause a lot of problems during the manufacturing process due to both the time and cost of straightening as well as their influence on later stages of production. Proper preparation of welding processes plays a growing role in the shipbuilding industry and the development of calculating tools is being observed. The paper presents a review and critical analysis of numerical methods for the assessment of welding distortion.
Predictions of cervical cancer identification by photonic method combined with machine learning
- Michał Kruczkowski
- Anna Drabik-Kruczkowska
- Anna Marciniak
- Martyna Tarczewska
- Monika Kosowska
- Małgorzata Szczerska
2022 Pełny tekst Scientific Reports
Cervical cancer is one of the most commonly appearing cancers, which early diagnosis is of greatest importance. Unfortunately, many diagnoses are based on subjective opinions of doctors—to date, there is no general measurement method with a calibrated standard. The problem can be solved with the measurement system being a fusion of an optoelectronic sensor and machine learning algorithm to provide reliable assistance for doctors in the early diagnosis stage of cervical cancer. We demonstrate the preliminary research on cervical cancer assessment utilizing an optical sensor and a prediction algorithm. Since each matter is characterized by refractive index, measuring its value and detecting changes give information about the state of the tissue. The optical measurements provided datasets for training and validating the analyzing software. We present data preprocessing, machine learning results utilizing four algorithms (Random Forest, eXtreme Gradient Boosting, Naïve Bayes, Convolutional Neural Networks) and assessment of their performance for classification of tissue as healthy or sick. Our solution allows for rapid sample measurement and automatic classification of the results constituting a potential support tool for doctors.
Preferences of the Facade Composition in the Context of Its Regularity and Irregularity
- Michał Malewczyk
- Antoni Taraszkiewicz
- Piotr Czyż
2022 Pełny tekst Buildings
Abstract: The aim of this study is to determine the preferences of Polish society towards building facades depending on the degree of the composition regularity of the facade elements. The subject matter is inspired by the authors’ observations in relation to the current architectural trends. The purposefulness of the conducted research results from several issues. Firstly, the reports of psychology and neurosciences clearly indicate the universality of certain preferences towards visual attributes of objects (e.g., in relation to abstract symmetric patterns), resulting from biological conditions. Secondly, residential, multi-family architecture is by definition designed for a wide group of anonymous users whose expectations must be met. One of the dimensions of the above-mentioned expectations is the visual dimension, partially dependent on the composition of the facade. In the course of the conducted research, it is shown that facades with a regular composition are assessed as more attractive than those with irregular compositions. Moreover, irregular facades evoked a negative effect of a significantly greater force than the positive effect in the case of regular facades. The above-described discoveries shed, in the authors’ opinion, a completely new light on the contemporary work of architects. It is extremely important to adapt the visual dimension of architecture to the expectations of its recipients, while taking care of its values and quality as a field of art.
Preferred Benchmarking Criteria for Systematic Taxonomy of Embedded Platforms (STEP) in Human System Interaction Systems
- Alicja Kwaśniewska
- Sharath Raghava
- Carlos Davila
- Mikael Sevenier
- David Gamba
- Jacek Rumiński
2022
The rate of progress in the field of Artificial Intelligence (AI) and Machine Learning (ML) has significantly increased over the past ten years and continues to accelerate. Since then, AI has made the leap from research case studies to real production ready applications. The significance of this growth cannot be undermined as it catalyzed the very nature of computing. Conventional platforms struggle to achieve greater performance and efficiency, what causes a surging demand for innovative AI accelerators, specialized platforms and purpose-built computes. At the same time, it is required to provide solutions for assessment of ML platform performance in a reproducible and unbiased manner to be able to provide a fair comparison of different products. This is especially valid for Human System Interaction (HSI) systems that require specific data handling for low latency responses in emergency situations or to improve user experience, as well as for preserving data privacy and security by processing it locally. Taking it into account, this work presents a comprehensive guideline on preferred benchmarking criteria for evaluation of ML platforms that include both lower level analysis of ML models and system-level evaluation of the entire pipeline. In addition, we propose a Systematic Taxonomy of Embedded Platforms (STEP) that can be used by the community and customers for better selection of specific ML hardware consistent with their needs for better design of ML-based HSI solutions.
Preliminary studies on the effect of feed speed on the colour change of wood
- Daniel Chuchała
- Sandra Karpinska
- Aleksandra Suchta
- Kazimierz Orłowski
2022 Pełny tekst Trieskove a Beztrieskove Obrabanie Dreva
This paper presents the results of preliminary analyses of the effect of cutting parameters on changes in the colour of wood. Beech wood cut with use circular saw was analysed. The cutting parameter tested was the feed speed, represented by the feed per tooth. Sawing processes with different feed per tooth ranging from 0.0008 mm to 0.09 mm were analysed. It was observed that over the entire range of feed rate per tooth analysed, the colour of the wood changed noticeably, while at certain values the change was very large. However, from a certain limit of feed per tooth, the values of total colour change begin to stabilise. The observed phenomena need to be analysed more extensively and confirmed using other wood sawing processes.
Preliminary study of linear viscoelasticity limits of cold recycled mixtures determined in Simple Performance Tester (SPT)
- Mariusz Jaczewski
- Cezary Szydłowski
- Bohdan Dołżycki
2022 Pełny tekst CONSTRUCTION AND BUILDING MATERIALS
The publication presents methodology developed for determination of linear viscoelasticity limits for cold recycled mixtures with cement and bituminous emulsion using Simple Performance Tester (SPT). Methodology was verified on reference materials (PCV and steel dummy specimens, cement concrete and asphalt concrete) to comply with elasticity and viscoelasticity theory. The developed methodology enabled determination of linear viscoelasticity limits for the tested cold recycled mixtures for base course. Tests were conducted for controlled strain ranging from 10 up to 110 µstrain. Linear viscoelasticity limits were determined based on stiffness moduli and phase angles. The combination of binding agents and test temperature had the greatest influence on the obtained values.
Preparation and characterization of asphaltene based adsorbents for gas-solid adsorption systems
- Maksymilian Plata-Gryl
2022 Pełny tekst
The dissertation presents results of the experimental research on asphaltene-based adsorbents (support coated with asphaltene layer) for gas-solid adsorption systems, with special reference to volatile organic compounds (VOCs) removal from gas streams. Analysis of gas adsorption properties revealed that asphaltenes isolated from oxidized bitumen have strong affinity toward VOCs. Interactions with target gas molecules, and selectivity were further enhanced by chemical modifications, of which nitration was the most beneficial for adsorption properties. Investigation of nitrated asphaltenes interaction with VOCs molecules revealed that the adsorption mechanism was driven by both physisorption and chemisorption. The strength of interactions with VOCs exceeds values reported for standard adsorbents. Fixed-bed adsorption studies revealed that facile coating of nitrated asphaltenes can significantly enhance adsorption capacity of a support material. Multiple adsorption-desorption cycles confirmed the durability of chemical modification and thermal resistance of asphaltene-based adsorbent. Utilization of asphaltenes and low cost supports, easily available in the target destination (e.g. diatomaceous earth or clays) can be an effective procedure for risk mitigation of hazardous VOCs, accompanied by effective waste management and low-value materials valorization.
Preparation and Properties of Thermoplastic Polyurethane Composites Filled with Powdered Buckwheat Husks
- Marcin Włoch
- Paulina Landowska
2022 Pełny tekst Materials
Bio-based fillers for the polymer composites are still interesting from the scientific and industrial point of view, due to their low cost and renewable nature. In this work partially green composites were obtained by the mixing of thermoplastic poly(ester-urethane) with the unmodified and modified (by acetylation) grinded buckwheat husks. Obtained biocomposites were characterized in the terms of their chemical structure (FTIR), microstructure (SEM), thermal stability (TGA), thermomechanical properties (DMTA), and selected mechanical properties. The results showed that introduction of grinded buckwheat husks (even if the amount is 60 wt%) permit retaining high values of tensile strength (around 8–10 MPa), but the increasing amount of applied filler is connected with the decreasing of elongation at break. It can result from good interaction between the polymer matrix and the bio-based filler (confirmed by high values of polymer matrix-filler interaction parameter determined from Pukánszky’s model for the tensile strength of composites). The applied chemical treatment results in changing of mechanical properties of filler and composites. Obtained results confirmed the possibility of using powdered buckwheat husks as filler for thermoplastic polyurethane.
Preparation of Allyl Alcohol Oligomers Using Dipicolinate Oxovanadium(IV) Coordination Compound
- Kacper Pobłocki
- Dagmara Jacewicz
- Juliusz Walczak
- Barbara Gawdzik
- Karol Kramkowski
- Joanna Drzeżdżon
- Paweł Kowalczyk
2022 Pełny tekst Materials
Currently, new precatalysts for olefin oligomerization are being sought in the group of vanadium(IV) complexes. Thus, the aim of our research was to examine the catalytic activity of the oxovanadium(IV) dipicolinate complex [VO(dipic)(H2O)2] 2 H2O (dipic = pyridine-2,6-dicarboxylate anion) in 2-propen-1-ol oligomerization as well as to characterize oligomerization products using matrix-assisted laser desorption/ionization–time-of-flight mass spectrometry (MALDI-TOF-MS), infrared spectroscopy (IR) and nuclear magnetic resonance (NMR). The oligomerization process took place at room temperature, under atmospheric pressure and under nitrogen atmosphere to prevent oxidation of the activator MMAO-12—the modified methylaluminoxane (7 wt.%) aluminum in toluene. The last point was to determine the catalytic activity of the complex in the oligomerization reaction of 2-propen-1-ol. The aspect that enriches this work is the proposed mechanism of oligomerization of allyl alcohol based on the literature.
Preparation of methanation catalysts for high temperature SOEC by β-cyclodextrin-assisted impregnation of nano-CeO2 with transition metal oxides
- Patryk Błaszczak
- Adrian Mizera
- Beata Bochentyn
- Sea-Fue Wang
- Piotr Jasiński
2022 Pełny tekst INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
The aim of this work was to prepare and examine the catalytic activity of nanometric CeO2 decorated with transition metal oxides – Ni, Co, Cu, Fe and Mn – towards a high-temperature methanation process under SOEC CO2/H2O simulated co-electrolysis conditions. Samples were prepared using the wet impregnation method via the conventional process and with the addition of native cyclodextrin. The influence of β-cyclodextrin (βCD) onto the size, dispersion and integration of the obtained metal nanoparticles was investigated. The differences between the catalysts’ reducibility revealed that samples prepared from βCD-containing solutions, in most cases, resulted in the creation of smaller MexOy NPs on the surface of the substrate material compared to those prepared using traditional nitrate solutions. The samples containing Ni and Co were the only ones that observably catalysed methane synthesis. The high dispersion and integration of NPs prepared via the proposed synthesis route resulted in increased catalytic activity and enhanced stability, which was most pronounced for the Co-impregnated sample. The methane production peak for Ni-βCD/CeO2 at 375℃ was characterised by nearly 99% CO conversion and 80% selectivity towards CH4 production. Co-βCD/CeO2 reached 84% CO conversion and almost 60% methane selectivity at 450℃. The usage of CeO2 coupled with βCD for the preparation of catalysts for high-temperature methane synthesis for use in SOECs gave promising results for further application.
Preparatory Railway Track Geometry Estimation Based on GNSS and IMU Systems
- Sławomir Judek
- Andrzej Wilk
- Władysław Koc
- Leszek Lewiński
- Artur Szumisz
- Piotr Chrostowski
- Sławomir Grulkowski
- Jacek Szmagliński
- Michał Michna
- Krzysztof Karwowski
- Jacek Skibicki
- Roksana Licow
2022 Pełny tekst Remote Sensing
The article discusses an important issue of railway line construction and maintenance, which fundamentally is the verification of geometric parameters of the railway track. For this purpose, mobile measurements have been performed using a measuring platform with two properly arranged GNSS receivers, which made it possible to determine the base vector of the platform. The measuring functionality of the system was extended by IMU. In this article, the effect of measuring conditions on the accuracy of the results collected from GNSS receivers is analyzed. In particular, the advisability of digital filtering of the recorded coordinates to eliminate disturbances is indicated. The article also presents the possible use of GNSS devices and the IMU unit for determining the direction angle and the longitudinal and lateral inclination angles of the railway track. This makes it possible to verify the track geometry in the horizontal plane by determining the positions of straight sections, circular arcs, and transition curves. It is indicated that the results of measurements are repeatable despite the dynamic interaction between the railway track and the measuring platform. The results confirm the usefulness of the applied GNSS and IMU signal processing method for monitoring the geometrical parameters of the railway track in operating conditions.
Pressure-induced flow processing behind the superior mechanical properties and heat-resistance performance of poly(butylene succinate)
- Tairong Kuang
- Runhang Zeng
- Aleksander Hejna
- Mohammad Saeb
- Bozhen Wu
- Feng Chen
- Tong Liu
- Mingqiang Zhong
2022 Pełny tekst E-POLYMERS
We propose a pressure-induced flow (PIF) processing method for the simultaneous enhancement of strength, toughness, and heat resistance of biodegradable poly(butylene succinate) (PBS). The pressure and temperature were systematically adjusted to optimize the tensile strength of PBS. Under the optimized processing conditions, the structured PBS was characterized by relatively high strength of 89.5 MPa, toughness of 21.4 kJ·m−2 , and improved heat resistance without deterioration of much of its ductility. Microscopic analyses witnessed denser and highly oriented crystalline domains along the flow direction caused by PIF processing. Detailed crystallization analysis made by 2D-WAXD and 2D-SAXS unraveled the extremely ordered PBS domains, which were featured by a significant increase in the orientation degree from 0.25 for the reference to 0.73 for PIF-processed PBS. Such a highly ordered microstructure substantially boosted the degree of crystallinity and heatresistance temperature of PBS. We believe that our findings would offer a facile, green, and cost-effective approach for fabricating biodegradable polymers with outstanding properties and performance.
Price Changes in Wholesale Market of Electrical Energy in Poland
- Paweł Bućko
- Izabela Prażuch
2022 Automatyka Elektryka Zakłócenia
The article discusses the Price changes on the wholesale electricity market in Poland Moreover, The price levels on the futures electricity markets and the spot transactions market are presented. The impact of emission charges under the EU ETS on the price of electricity in the domestic market has been taken into consideration Furthermore, the basic determinants of the generation structure in Poland that influence the level of energy prices are presented. The volatility of the prices of energy produced from RES and sold under tenders has been also discussed.
Principles of target DNA cleavage and the role of Mg2+ in the catalysis of CRISPR–Cas9
- Łukasz Nierzwicki
- Pablo Ricardo Arantes
- Martin Jinek
- George Lisi
- Giulia Palermo
- Kyle East
- Jonas Binz
- Rohain Vsu
- Ahsan Mohd
- Erin Skeens
- Martin Pacesa
2022 Nature Catalysis
At the core of the CRISPR–Cas9 genome-editing technology, the endonuclease Cas9 introduces site-specific breaks in DNA. However, precise mechanistic information to ameliorate Cas9 function is still missing. Here, multimicrosecond molecular dynamics, free energy and multiscale simulations are combined with solution NMR and DNA cleavage experiments to resolve the catalytic mechanism of target DNA cleavage. We show that the conformation of an active HNH nuclease is tightly dependent on the catalytic Mg2+, unveiling its cardinal structural role. This activated Mg2+-bound HNH is consistently described through molecular simulations, nuclear magnetic resonance (NMR) and DNA cleavage assays, revealing also that the protonation state of the catalytic H840 is strongly affected by active site mutations. Finally, ab initio quantum mechanics (density functional theory)/molecular mechanics simulations and metadynamics establish the catalytic mechanism, showing that the catalysis is activated by H840 and completed by K866, thus rationalizing DNA cleavage experiments. This information is critical to enhancing the enzymatic function of CRISPR–Cas9 towards improved genome editing.
Privacy-Preserving, Scalable Blockchain-Based Solution for Monitoring Industrial Infrastructure in the Near Real-Time
- Andrzej Sobecki
- Stanisław Barański
- Julian Szymański
2022 Pełny tekst Applied Sciences-Basel
This paper proposes an improved monitoring and measuring system dedicated to industrial infrastructure. Our model achieves security of data by incorporating cryptographical methods and near real-time access by the use of virtual tree structure over records. The currently available blockchain networks are not very well adapted to tasks related to the continuous monitoring of the parameters of industrial installations. In the database systems delivered by default (the so-called world state), only the resultant or the last value recorded by the IoT device is stored. Effective use of measurement values recorded in the past requires each time viewing the entire chain of recorded events for a given IoT device. The solution proposed in the article introduces the concept of dependent wallets, the purpose of which is the aggregation and indexation of changes in machine parameters, recorded in the original wallets. As a result, we can easily get data from a certain sensor or sensors in the specified date range, even if the chain of transactions is very long. Our contribution is a universal mechanism that improves the efficiency of the infrastructure monitoring process, which uses blockchains to record measurements from sensors. The proposed model has been experimentally tested on two types of blockchains: Stellar and Hyperledger Fabric.
Probing Local Structural Changes by Sharp Luminescent Infrared Nanophosphor for Application in Light-Emitting Diodes
- Dominik Kreft
- Sebastian Mahlik
- Natalia Majewska
- Mu-huai Fang
- Hsu Jia-yu
- Ren-jei Chung
- Sheu Hwo-shuenn
- Lee Jyh-fu
2022 CHEMISTRY OF MATERIALS
Cr3+-doped infrared phosphors are promising candidates for next-generation phosphor-converted infrared light-emitting diodes (LEDs) because they can, in principle, tune and convert the luminescence spectra from an LED chip. However, most studies focus on broad-band Cr3+-doped phosphors, and the control mechanism of Cr3+-doped phosphors with sharp line emissions remains ambiguous. Here, we report LiGa5(1–x)Al5xO8:Cr3+ phosphors with sharp line emissions. The luminescence analysis reveals the subtle change of the local structure around Cr3+, which cannot be well resolved by X-ray diffraction. The deviation between the temperature-dependent photoluminescence and decay profile is introduced as well. Furthermore, the morphologies of LiGa5(1–x)Al5xO8:Cr3+ phosphors with high aluminum concentration demonstrate their great potential for mini-LED applications. Finally, an LED package is constructed, and it reveals the potential for angiographic applications. This study opens up a new understanding and perspective for Cr3+-doped sharp emission phosphors and reveals their potential for LED applications.
Problematyka implantacji protez piersiowych - przegląd literatury
- Klaudia Malisz
- Beata Świeczko-Żurek
2022
Operacje związane z wykorzystaniem implantów piersi są jednymi z najczęściej przeprowadzanych zabiegów chirurgii plastycznej, dlatego istotne jest, aby zminimalizować ryzyko powikłań. Do najczęściej występujących zalicza się: obrzęk, wysięk, krwiaki, problemy z gojeniem ran oraz infekcje. Zakłada się, że infekcja jest głównym czynnikiem prowadzącym do degradacji implantu. Agresywne środowisko gospodarza, ciągłe zmiany pH i temperatury przyczyniają się do degradacji implantu. Literatura podaje, że proces ten może spowodować uwolnienie cząsteczek silikonu, które mogą zaostrzyć proces zapalny. Usztywnienie materiału protezy z czasem użytkowania zmienia tarcie mechaniczne na granicy tkanka-implant, wpływając znacząco na zachowanie materiału implantu w ciele kobiety, podczas ekspozycji na zewnętrzne obciążenia mechaniczne. Ponadto w przypadku obecności czynnika zapalnego, np. infekcji, torebka może zgęstnieć lub zwapnieć. Bakterie obecne na powierzchni implantu mają tendencje do tworzenia biofilmu, próbuje się temu zapobiegać, wykorzystując protezy o gładkiej powierzchni, ukierunkowaną nanoteksturyzację lub nanomateriały np. nanocząstki srebra.
Problems associated with the up of actuating system of a single-disc lapping machine for flat surfaces
- Adam Barylski
2022 Technologia i Automatyzacja Montażu
Przedstawiono wyniki badań nagrzewania się podstawowych elementów układu wykonawczego docierarki jednotarczowej o standardowej kinematyce do obróbki powierzchni płaskich. Analizowano przyrost temperatury zespołu napędowego, rolek i pierścieni prowadzących separatory oraz tarczy docierającej i obrabianych elementów. Badano nagrzewanie się układu obróbkowego podczas wyrównywania żeliwnego narzędzia i docierania powierzchni płaskich. Docieranie jest jedną z metod obróbki ściernej stosowaną podczas indywidualnego dopasowywania elementów w montażu lub przy wykorzystaniu kompensatora technologicznego. Przyrost temperatury w układzie obróbkowym ma między innymi wpływ na dokładność wymiarową docieranych elementów metalowych.
Problemy w szkoleniu i egzaminowaniu rowerzystów w Polsce
- Alicja Jarczewska
- Joanna Wachnicka
2022 Pełny tekst Przegląd Komunikacyjny
Artykuł przedstawia diagnozę problemów, które wpływają na jakość poziomu szkolenia i egzaminowania rowerzystów w Polsce. W pierwszej części zaprezentowano statystyki dotyczące wypadków z udziałem rowerzystów w Polsce, mających miejsce na przestrzeni ostatnich lat. Kolejno opisano obowiązujący system szkolenia oraz egzaminowania rowerzystów, a także nauczycieli i instruktorów. Dodatkowo ukazano przykłady dobrej praktyki, które stosują kraje o wysoko rozwiniętej kulturze rowerowej. Na podstawie oceny stanu istniejącego oraz przeprowadzonej analizy problematyki wyciągnięto odpowiednie wnioski oraz zaproponowano rekomendacje. Mogą się one przyczynić do uświadomienia potrzeby zmiany podejścia w polskim systemie edukacji rowerowej i docelowo do zwiększenia poczucia bezpieczeństwa rowerzysty w ruchu drogowym, zmniejszając w ten sposób liczbę obrażeń, a także ofiar śmiertelnych.
Process [Intellectual Output 2] Guidelines for a design process leading to a high-quality Baukultur in the digital age
- Lotte Bjerregaard Jensen
- Dorota Kamrowska-Załuska
- Małgorzata Kostrzewska
- Bartosz Macikowski
- Justyna Borucka
- Annette Boegle
- Emiliya Popova
2022
The main aim of the intellectual output “Process” is to identify, explore and evaluate new design processes for shaping the built environment, which are informed, collaborative, and adaptable, allow customization and are generally enabled by the application of digital tools. Further, it aims at creating methodological guidelines for future-oriented design processes leading to a high-quality Baukultur in the digital age. The guidelines are presented in the form of guiding questions.