2023 - Repozytorium publikacji - Politechnika Gdańska

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Synthesis of Cyano-Benzylidene Xanthene Synthons Using a Diprotic Brønsted Acid Catalyst, and Their Application as Efficient Inhibitors of Aluminum Corrosion in Alkaline Solutions
- Amin Mohammed
- Gaber Mersal
- Morad El-Hendawy
- Abdallah Shaltout
- Ali Badawi
- Johan Boman
- Adil Gobouri
- Murat Saracoglu
- Fatma Kandemirli
- Rabah Boukherroub
- Jacek Ryl
- Mohamed Khalifa
2023 Pełny tekst MOLECULES
Novel cyano-benzylidene xanthene derivatives were synthesized using one-pot and condensation reactions. A diprotic Brønsted acid (i.e., oxalic acid) was used as an effective catalyst for the promotion of the synthesis process of the new starting xanthene–aldehyde compound. Different xanthene concentrations (ca. 0.1–2.0 mM) were applied as corrosion inhibitors to control the alkaline uniform corrosion of aluminum. Measurements were conducted in 1.0 M NaOH solution using Tafel extrapolation and linear polarization resistance (LPR) methods. The investigated xanthenes acted as mixed-type inhibitors that primarily affect the anodic process. Their inhibition efficiency values were enhanced with inhibitor concentration, and varied according to their chemical structures. At a concentration of 2.0 mM, the best-performing studied xanthene derivative recorded maximum inhibition efficiency values of 98.9% (calculated via the Tafel extrapolation method) and 98.4% (estimated via the LPR method). Scanning electron microscopy (SEM) was used to examine the morphology of the corroded and inhibited aluminum surfaces, revealing strong inhibitory action of each studied compound. High-resolution X-ray photoelectron spectroscopy (XPS) profiles validated the inhibitor compounds’ adsorption on the Al surface. Density functional theory (DFT) and Monte Carlo simulations were applied to investigate the distinction of the anticorrosive behavior among the studied xanthenes toward the Al (111) surface. The non-planarity of xanthenes and the presence of the nitrile group were the key players in the adsorption process. A match between the experimental and theoretical findings was evidenced.
Synthesis of N-doped TiO2 nanoparticles with enhanced photocatalytic activity for 2,4-dichlorophenol degradation and H2 production
- Javed Ali Khan
- Murtaza Sayed
- Noor S. Shah
- Sanaullah Khan
- Ashfaq Ahmad Khan
- Muhammad Sultan
- Ammar M. Tighezza
- Jibran Iqbal
- Grzegorz Boczkaj
2023 Pełny tekst Journal of Environmental Chemical Engineering
Nitrogen-doped titanium dioxide (N-TiO2) nanoparticles were prepared using a modified sol-gel method. The as-prepared nanoparticles were characterized by state-of-the-art techniques for their optical, structural and morphological properties. The crystallite size, surface area and bandgap energy of reference TiO2 and N-TiO2 nanoparticles were found to be 16.1 and 10.9 nm, 83.6 and 131.8 m2 g−1 and 3.23 and 2.89 eV, respectively. The photocatalytic activities, in terms of 2,4-dichlorophenol (2,4-DCP) degradation, of reference TiO2 and N-TiO2 were found to be 46.9% and 65.4% at 120 min of treatments under UV light irradiation and 21.5% and 77.6% at 240 min of treatment under visible light irradiation, employing 153.4 µM 2,4-DCP, 1 g/L photocatalyst dosage, and pH 5.6. Interestingly, considerable H2 production rate (i.e., 386 μmol h−1 g−1) was observed for visible/N-TiO2 system in presence of 0.2 wt% Pt. The study revealed that visible/N-TiO2 photocatalytic system can be used as an economically viable technology for environmental sustainability.
SYNTHESIZING MEDICAL TERMS – QUALITY AND NATURALNESS OF THE DEEP TEXT-TO-SPEECH ALGORITHM
- Bożena Kostek
- Barbara Szyca
2023 Pełny tekst Journal of the Acoustical Society of America
The main purpose of this study is to develop a deep text-to-speech (TTS) algorithm designated for an embedded system device. First, a critical literature review of state-of-the-art speech synthesis deep models is provided. The algorithm implementation covers both hardware and algorithmic solutions. The algorithm is designed for use with the Raspberry Pi 4 board. 80 synthesized sentences were prepared based on medical and everyday language employing the TTS algorithm. For tests, an application is built, containing a questionnaire allowing for evaluating the quality and naturalness of the synthesized speech, for both types of language. It is followed by the algorithm efficiency tests. A presentation of the performed tests, along with the results obtained from 30 respondents, is shown. The discussion consists of a statistical analysis of the obtained results and a comparison with other speech recognition solutions used as a reference. Finally, in the summary section, there is an overall conclusion of this approach and promising directions for future development. This work is supported by the Polish National Center for Research and Development (NCBR) project: “ADMEDVOICE-Adaptive intelligent speech processing system of medical personnel with the structuring of test results and support of therapeutic process,” no. INFOSTRATEG4/0003/2022.
System Loss Model for Body Area Networks in Room Scenarios
- Manuel M. Ferreira
- Filipe D. Cardoso
- Sławomir Ambroziak
- Mariella Särestöniemi
- Luis M. Correia
2023
This paper presents an analysis of system loss in Body Area Networks for room scenarios, based on a wideband measurement campaign at 5.8 GHz. The measurements were performed with a fixed antenna transmitting vertically and horizontally polarised signals, while the user wears dualpolarised antennas. The average system losses in co- and crosspolarised channels are 41.4 and 42.6 dB for vertically polarised transmitted signals and 41.8 and 45.0 dB for horizontally ones, showing that polarisation plays a role in the radio channel. Analytical models for the average and standard deviation of system loss are presented, with a linear dependence on user mobility, on transmitted/received polarisation, and on link visibility and dynamics. Overall, a good fit between model and measurements is obtained, with a mean square error of 2.3 and 0.12 dB for the average and standard deviation, respectively.
System Loss Model for Body-to-Body Networks in Indoor and Outdoor Environments
- Sławomir Ambroziak
- Krzysztof Cwalina
- Manuel M. Ferreira
- Filipe D. Cardoso
- Luis M. Correia
2023
A system loss model for body-to-body networks in indoor and outdoor environments is proposed in this paper, based on measurements taken at 2.45 GHz. The influence of the type of environment, antenna visibility and user mobility on model parameters has been investigated. A significant impact of mutual antennas’ placement and their visibility is shown. The proposed model fits well to empirical data, with the average root mean square error being 2.1 dB and the coefficient of determination being above 0.6 in the majority of cases. For designing purposes in generalised cases, it is recommended that the system loss exponent is set to 1.5, and the system loss at the reference distance is equal to 55.9 dB.
System monitorowania korozji w instalacjach wodnych platformy wydobywczej Baltic Beta
- Kinga Domańska
2023 Pełny tekst
Realizacja doktoratu rozwiązała problemy korozyjne w jednym ze strategicznych obszarów procesu eksploatacji ropy. Polegała na uruchomieniu monitoringu korozji w instalacji zatłaczającej wodę morską do złoża ropy, na platformie wydobywczej firmy LOTOS Petrobaltic. Wdrożono automatyczny system monitorowania korozji metodą polaryzacji liniowej, oszacowano korozyjność uzdatnionej wody, zidentyfikowano rodzaje korozji występujące w instalacji. Zainstalowano dwa czujniki korozyjne: na odcinku, gdzie realizowane jest chlorowanie i filtracja wody oraz po wieży odtleniającej, gdzie odtleniona woda jest obrobiona dodatkiem inhibitora korozji. Wskazania automatycznego systemu monitorowania korozji zestawiano z parametrami pracy instalacji oraz wynikami dodatkowych analiz chemicznych i biologicznych uzdatnianej wody. Pozwoliło to zidentyfikować zagrożenia korozyjne oraz określić wpływ parametrów pracy instalacji na szybkość korozji. Opracowano skuteczną metodę ochrony antykorozyjnej, wybrano najefektywniejszy inhibitor korozji, przeprowadzono jego testy laboratoryjne i polowe bezpośrednio w instalacji. Przyczyniło się to do polepszenia jakości wody zatłaczanej i zmniejszenia ryzyka kolmatacji złoża ropy B3, które mogłoby doprowadzić do zmniejszenia wielkości wydobycia ropy oraz do pogorszenia jej jakości. Zdobyte doświadczenie będzie w przyszłości wykorzystywane również w innych instalacjach zatłaczających LOTOS Petrobaltic’u.
SYSTEM RADIOLOKALIZACYJNY OPARTY NA FARMIE TURBIN WIATROWYCH
- Jacek Stefański
- Jarosław Sadowski
2023 Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne
W referacie zaproponowano wykorzystanie farmy turbin wiatrowych do budowy systemu radiolokalizacyjnego dla obiektów latających (samolotów). Zaproponowane rozwiązanie umożliwia oszacowanie położenia obiektu w przestrzeni, zwłaszcza w ruchu, za pomocą sygnałów lokalizacyjnych nadawanych asynchronicznie z wież turbin wiatrowych. Przedstawiono matematyczną analizę metody oraz wyniki badań symulacyjnych efektywności pracy rozwiązania dla wybranych parametrów systemowych.
System waluty lokalnej dla wspierania zrównoważonych zachowań wśród mieszkańców Gdańska
- Piotr Czyż
- Małgorzata Romanowska
- Iga Perzyna
2023 Alcumena. Pismo Interdyscypliname - Alcumena. Interdisciplinary Jouma
Niniejszy artykuł ma na celu wprowadzenie do systemu alternatywnej waluty lokalnej, wspierającej zrównoważone działania, która jest rozwijana na terenie Gdańska pod marką PULA. System waluty alternatywnej jest wielostronną umową na używanie czegoś innego niż legalny środek płatniczy (np. pieniądz krajowy) jako medium wymiany. Jego stworzenie ma na celu łączenie niezaspokojonych potrzeb z nieużywanymi zasobami (Telalbasic, 2017). Waluty alternatywne (inaczej: uzupełniające) są specyficznym rodzajem innowacji społecznej, łączącym aspekty społeczne z procesami ekonomicznymi (Dagnes, Storti, 2020). Wspierają lokalny rozwój, gospodarkę, a także wzmacniają wzajemne uznanie i relacyjne zaufanie. Mają na celu lepsze zaspokajanie potrzeb społecznych i nawiązywanie nowych powiązań między działalnością gospodarczą a podstawami społecznymi.
Systematic Literature Review on Click Through Rate Prediction
- Paulina Leszczełowska
- Maria Bollin
- Marcin Grabski
2023
The ability to anticipate whether a user will click on an item is one of the most crucial aspects of operating an e-commerce business, and clickthrough rate prediction is an attempt to provide an answer to this question. Beginning with the simplest multilayer perceptrons and progressing to the most sophisticated attention networks, researchers employ a variety of methods to solve this issue. In this paper, we present the findings of a comprehensive literature review that will assist researchers in getting a head start on developing new solutions. The most prevalent models were variants of the state-of-the-art DeepFM model.
Systemic analysis of a manufacturing process based on a small scale bakery
- Radosław Drozd
- Radosław Wolniak
- Jan Piwnik
2023 Quality and Quantity
The main aim of the article is to present two new innovative concepts of reliability of a functioning manufacturing system in the process of making bread in small-scale bakeries. Reliability is understood as one of the representations of an operator acting on specifc streams in time to - t. One of these represents the global reliability of a system as a function of parallel action of all the streams of the system in time to to t and is denoted as Pg(t). The second representation of reliability is a scalar value, Pss It shows a new function of global reliability of a manufacturing process as a product of system stream reliability. In order to plot the fow of the manufacturing process’s global reliability function, we need to perform detailed calculations, computations, and analysis of the diferences of individual values in real time, as well as plan an algorithm of the fow of system streams. This needs a lot of efort, translating however, to a detailed picture of the process. In the analysed example, measurements and research revealed an important increase of the value of reliability in a transition from a traditional to a robotised bakery. The article also presents a new concept of the reliability of a technological process, based on the analysis of relations of elements of the following streams: energy, matter, information, time, and fnances. It shows the method of specifying streams and the method for defning the reliability of important and supportive relations. Important relations between stream elements are defned as having the reliability value of one in time. The Pss value characterises failure-free operation of the whole system. Its average value in the normative time tn expresses the efciency of the manufacturing system. The value Pss is a quotient of the number of important relation and the sum of important and supportive relations. The formula for Pss shows the method of optimising the process through the increasing of the number of important relations between the input stream components. The concept has been applied to study the efciency of operation of a small-scale bakery. Systemic analysis of a bakery allows for important increase in the reliability of baking bread if robotisation has been implemented. The concept of systemic-stream reliability Pss may be applied to analyse the efficiency of any technological process and optimisation of any manufacturing process.
Szlifowanie na docierarkach tarczowych
- Adam Barylski
2023 Stal Metale & Nowe Technologie
Przedstawiono technologie szlifowania powierzchni płaskich na docierarkach tarczowych. Omówiono stosowane narzędzia segmentowe, obrabiarki dwutarczowe i zalety mikroszlifowania. Porównano proces docierania konwencjonalnego luźnym ścierniwem z mikroszlifowaniem z kinematyką docierania.
Tacit knowledge acquisition & sharing, and its influence on innovations: A Polish/US cross-country study
- Wioleta Kucharska
- G. Scott Erickson
2023 Pełny tekst INTERNATIONAL JOURNAL OF INFORMATION MANAGEMENT
This study measures the relationship between tacit knowledge sharing and innovation in the Polish (n=350) and US (n=379) IT industries. Conceptually, the study identifies the potential sources of tacit knowledge development by individuals. That is, the study examines how “learning by doing” and “learning by interaction” lead to a willingness to share knowledge and, as a consequence, to support process and product/service innovation. This study empirically demonstrates that tacit knowledge internalization and externalization (awareness and sharing) significantly mediate between tacit knowledge experimentation and socialization (acquisition) and its final combination (knowledge in action). While such theoretical assumptions already exist, they have not yet been empirically explained and revealed in a single structural model. Further, this empirical approach enabled a demonstration that internalization and externalization of tacit knowledge may occur consciously or unconsciously with equal success. Even so, the study also showed conscious tacit knowledge’s greater impact on innovation. Therefore, an organizational effort to manage autonomous, informal, and strongly contextual tacit knowledge is worthwhile and creates the capacity for superior competitive advantage. Finally, this study also demonstrates that national context influences tacit knowledge acquisition. In the US, “learning by doing” is dominant, whereas in Poland, “learning by interaction” and critical thinking are more common. This might be related to factors such as risk acceptance that could be studied in more detail and provide opportunities for future research.
Tackling microplastics pollution in global environment through integration of applied technology, policy instruments, and legislation
- Tonni Agustiono Kurniawan
- Ahtisham Haider
- Ayesha Mohyuddin
- Rida Fatima
- Muhammad Salman
- Anila Shaheen
- Hafiz Muhammad Ahmad
- Hussein Al-Hazmi
- Mohd Hafiz Dzarfan Othman
- Faissal Aziz
- Abdelkader Anouzla
- Imran Ali
2023 JOURNAL OF ENVIRONMENTAL MANAGEMENT
Microplastic pollution is a serious environmental problem that affects both aquatic and terrestrial ecosystems. Small particles with size of less than 5 mm, known as microplastics (MPs), persist in the environment and pose serious threats to various species from micro-organisms to humans. However, terrestrial environment has received less attention than the aquatic environment, despite being a major source of MPs that eventually reaches water body. To reflect its novelty, this work aims at providing a comprehensive overview of the current state of MPs pollution in the global environment and various solutions to address MP pollution by integrating applied technology, policy instruments, and legislation. This review critically evaluates and compares the existing technologies for MPs detection, removal, and degradation, and a variety of policy instruments and legislation that can support the prevention and management of MPs pollution scientifically. Furthermore, this review identifies the gaps and challenges in addressing the complex and diverse nature of MPs and calls for joint actions and collaboration from stakeholders to contain MPs. As water pollution by MPs is complex, managing it effectively requires their responses through the utilization of technology, policy instruments, and legislation. It is evident from a literature survey of 228 published articles (1961–2023) that existing water technologies are promising to remove MPs pollution. Membrane bioreactors and ultrafiltration achieved 90% of MPs removal, while magnetic separation was effective at extracting 88% of target MPs from wastewater. In biological process, one kg of wax worms could consume about 80 g of plastic/day. This means that 100 kg of wax worms can eat about 8 kg of plastic daily, or about 2.9 tons of plastic annually. Overall, the integration of technology, policy instrument, and legislation is crucial to deal with the MPs issues.
Tailoring a low-energy ball milled MnCo2O4 spinel catalyst to boost oxygen evolution reaction performance
- Sylwia Pawłowska
- Krystian Lankauf
- Patryk Błaszczak
- Jakub Karczewski
- Karolina Górnicka
- Grzegorz Cempura
- Piotr Jasiński
- Sebastian Molin
2023 APPLIED SURFACE SCIENCE
The development of cost-efficient oxygen evolution reaction (OER) catalysts is one of the most important tasks facing modern techniques for hydrogen production. In this work, for the first time, a low-energy ball milling process of MnCo2O4 (MCO) spinel powders, with a mechanical modification time exceeding 1 day was used. After 6 days of ball-milling, the obtained overpotential of the electrocatalyst reached the value of 375 mV at 10 mA cm-2, which is a relatively low value obtained for this type of compound. The studies showed how the mechanical (low-energy long-term milling process) and chemical modification of the fragmented spinel powder nanoparticle surfaces affects the increase of the electrocatalytic properties. The addition of the appropriate amount of conductive carbon black (cCB) and Nafion ionomer to the ink of the MCO spinel also has a significant effect on the improvement of the catalytic performance of the manganese-cobalt oxide during the milling process. By reducing the amount of Nafion to 10% of its initial value, the overpotential dropped to 352 mV at 10 mA cm-2 after 30 days of ball-milling. This shows that catalyst ink and layer composition are important factors influencing the catalyst’s efficiency in the OER
Tailoring diamondised nanocarbon-loaded poly(lactic acid) composites for highly electroactive surfaces: extrusion and characterisation of filaments for improved 3D-printed surfaces
- Mateusz Cieślik
- Agnieszka Susik
- Mariusz Banasiak
- Robert Bogdanowicz
- Krzysztof Formela
- Jacek Ryl
2023 Pełny tekst MICROCHIMICA ACTA
A new 3D-printable composite has been developed dedicated to electroanalytical applications. Two types of diamondised nanocarbons - detonation nanodiamonds (DNDs) and boron-doped carbon nanowalls (BCNWs) - were added as fillers in poly(lactic acid) (PLA)-based composites to extrude 3D filaments. Carbon black served as a primary filler to reach high composite conductivity at low diamondised nanocarbon concentrations (0.01 to 0.2 S/cm, depending on the type and amount of filler). The aim was to thoroughly describe and understand the interactions between the composite components and how they affect the rheological, mechanical and thermal properties, and electrochemical characteristics of filaments and material extrusion printouts. The electrocatalytic properties of composite-based electrodes, fabricated with a simple 3D pen, were evaluated using multiple electrochemical techniques (cyclic and differential pulse voltammetry and electrochemical impedance spectroscopy). The results showed that the addition of 5 wt% of any of the diamond-rich nanocarbons fillers significantly enhanced the redox process kinetics, leading to lower redox activation overpotentials compared with carbon black–loaded PLA. The detection of dopamine was successfully achieved through fabricated composite electrodes, exhibiting lower limits of detection (0.12 μM for DND and 0.18 μM for BCNW) compared with the reference CB-PLA electrodes (0.48 μM). The thermogravimetric results demonstrated that both DND and BCNW powders can accelerate thermal degradation. The presence of diamondised nanocarbons, regardless of their type, resulted in a decrease in the decomposition temperature of the composite. The study provides insight into the interactions between composite components and their impact on the electrochemical properties of 3D-printed surfaces, suggesting electroanalytic potential.
Tailoring optical constants of few-layer black phosphorus coatings: Spectroscopic ellipsometry approach supported by ab-initio simulation
- Aleksandra Wieloszyńska
- Krzysztof Pyrchla
- Paweł Jakóbczyk
- Dawid Lentka
- Mirosław Sawczak
- Łukasz Skowroński
- Robert Bogdanowicz
2023 Pełny tekst JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
2D black phosphorus (BP) has attracted extensive attention as an anisotropic platform for novel optoelectronic and polarizing optics applications. Insight into the factors that tune the optical and polarizing properties of 2D BP reveals their essential influence on BP-based photonic and optoelectronic devices. In this work, studies of the optical constants of few-layer black phosphorus coatings are studied and discussed, with particular emphasis on the complex dielectric function. Herein, the complex optical constants of multi-flake composite films in the energy range of 1.38–6.2 eV by spectroscopic ellipsometry with the use of the classical optical model have been determined. Classical optical simulations were supplied by dielectric function estimations delivered by density functional theory. Additionally, few-layer black phosphorus coatings were imaged by polarizing microscopy and investigated by Raman spectroscopy, revealing a size-tunable flake composition. The pattern analysis of the polarization images reveals a shift in polarization anisotropy originated mainly from the central region of the flake. The semi-isotropic optical properties suggest that the extinction coefficient of BP flakes defines the applications of BP in photonics, waveguides, and directional optoelectronic devices.
Tam gdzie fikcja spotyka się z rzeczywistością
- Jacek Lebiedź
2023 Pismo PG
Na tyłach budynku A Wydziału Elektroniki, Telekomunikacji i Informatyki (tego z zerami i jedynkami na elewacji) mieści się laboratorium odmienne wyglądem od innych laboratoriów politechnicznych. Zajmuje ono sięgającą czwartego piętra czarną sześcienną kostkę dobudowaną 10 lat temu w bezpośrednim sąsiedztwie audytorium, któremu od dwóch lat patronuje doc. Marianna Sankiewicz, przysiadłszy na ławeczce przed jego wejściem. Wydaje się, że nie tylko zaprasza do audytorium, ale również do wspomnianego wyżej nietypowego laboratorium, do którego prowadzą drzwi przed wejściem do audytorium.
Targeting Spike‐ACE2 Interface of SARS‐CoV‐2 and its Omicron Variant: A Comparative Screening of Potential Inhibitors for Existing and Anticipating Variants Using Molecular Modelling Approach
- Dineshbabu Takkella
- Sudhanshu Sharma
- Radosław Krzemieniecki
- Ashok Pabbathi
- Subrahmanyam Sappati
- Krishna Gavvala
2023 ChemistrySelect
The recent COVID pandemic has shown major impact on public health and economic crisis. Despite the development of many vaccines and drugs against the severe acute respiratory syndrome (SARS) coronavirus 2, the pandemic still persists. The continued spread of the virus is largely driven by the emergence of viral variants such as α, β, γ, delta, epsilon spike, omicron and its subvariants (BA.1,2,3) which can evade the current vaccines through mutations in the spike protein.[1] For instance, spike to omicron has modifications at different mutations (D405N, K417N, S477N, E484A, Q493R, N501Y, Y505H).[1b] These mutations will affect functional properties and hence may alter the specificity towards potential drug candidates. Therefore, it is important to understand the role of these mutations on interactions with existing drug candidates. In this study, we focus on the two forms of SARS-CoV-2, such as wild-type spike and omicron and unveil their interactions with different drugs. For this purpose, we have taken about hundred drugs categorised in twelve groups of anticancer, natural products, enzyme inhibitors, antivirals, antioxidants, anti-bacterials, anti-malarials, antidiabetics, antimicrobials, anti-inflammatory, antifungals and other drugs. We used in-silico methods to understand the effect of these drug molecules on wild type and omicron spike RBD at the interface of ACE2 enzyme. Based on molecular docking results, we have chosen 7 best docked compounds and studied their interaction patterns in detail by molecular dynamics simulation.
Technical and economic analysis of energy storage in the compressed air technology with low capacity for the production plant
- Krzysztof Kosowski
- Marian Piwowarski
- Wojciech Włodarski
- Paweł Ziemiański
- Gabriel Pawlak
2023 ENERGY CONVERSION AND MANAGEMENT
Compressed air energy storage (CAES) system is a promising technology due to its numerous advantages, including relatively low maintenance cost, a long lifespan and high operational flexibility. This article explores the possibility of designing a CAES power plant as a source of electricity and heat for an existing industrial plant. The study involves the technical analysis of the power plant parameters and the economic analysis of the pro- ject’s feasibility. The proposed power plant is an innovative solution with an air expander with an external combustion chamber and a bypass that allows the combustion of virtually any fuel, making it particularly environmentally friendly. In the system, the use of a combustion chamber at the outlet of the turbine makes the chamber operate at a constant pressure that is close to atmospheric pressure. The designed power plant has a capacity of approx. 3.1 MW. Turbine operation reaches an efficiency of about 76%. Additional modification of the power plant and the use of heat from compressor cooling could increase the power of the power plant by about 0.5 MW. The conducted financial analysis showed that the project is economically feasible under the adopted assumptions in three modeled scenarios. Under the most optimistic scenario, the internal rate of return (IRR) reached 14.27%, and the investment return time was 10 years. When using long-term energy prices data, it was 7.46% and 23 years, respectively. The proposed CAES system is original and competitive in comparison to the currently used solutions.
Techniki zwiększania efektywności metody elementów skończonych poprzez redukcję dziedziny obliczeniowej z wykorzystaniem własności geometrii struktur
- Małgorzata Warecka
2023 Pełny tekst
Współczesna elektronika ze względu na swój szybki rozwój wymaga od nas efektywnego modelowania zjawisk polowych. Celem rozprawy jest zwiększanie efektywności metody elementów skończonych poprzez redukcję dziedziny obliczeniowej z wykorzystaniem własności geometrii struktur oraz jej hybrydyzację z użyciem technik analitycznych. Rozprawa zawiera przegląd stanu wiedzy na temat dostępnych obecnie technik modelowania jak również opis kluczowych aspektów metody elementów skończonych. W ramach przeprowadzonych badań powstało pięć algorytmów, które obejmują zarówno rozpraszanie fali elektromagnetycznej jak i analizy prowadnic falowych czy struktur rezonansowych. Zaprezentowane techniki wykorzystują między innymi symetrię osiową czy dekompozycję dziedziny. Praca zawiera hybrydyzację metody elementów skończonych wykorzystującą uogólnioną macierz impedancji, która pozwala w łatwy sposób modelować otwartą przestrzeń. Przebadane zostały również ograniczenia związane z jej wykorzystaniem do modelowania struktur periodycznych w porównaniu z periodycznymi warunkami brzegowymi. Praca obejmuje dwie struktury rezonansowe, przy czym jedna z nich wymaga rozwiązania nieliniowego problemu własnego. Dla wszystkich zaproponowanych technik w celu potwierdzenia poprawności prezentowanych podejść, otrzymane wyniki porównano z rezultatami dostępnymi w literaturze oraz otrzymanymi innymi uznanymi metodami.