2022 - Repozytorium publikacji - Politechnika Gdańska

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Solvent Exchange around Aqueous Zn(II) from Ab Initio Molecular Dynamics Simulations
- Adrian Malinowski
- Maciej Śmiechowski
2022 Pełny tekst Liquids
Hydrated zinc(II) cations, due to their importance in biological systems, are the subject of ongoing research concerning their hydration shell structure and dynamics. Here, ab initio molecular dynamics (AIMD) simulations are used to study solvent exchange events around aqueous Zn2+, for which observation in detail is possible owing to the considerable length of the generated trajectory. While the hexacoordinated Zn(H2O)62+ is the dominant form of Zn(II) in an aqueous solution, there is a non-negligible contribution of the pentacoordinated Zn(H2O)52+ complex which presence is linked to the dissociative solvent exchange events around Zn2+. The pentacoordinated Zn(II) has a much tighter hydration sphere and is characterized by a trigonal bipyramidal structure, in contrast to the usual octahedral symmetry of the hexacoordinated complex. In total, two full exchange events are registered in the analyzed trajectory. AIMD simulations on an adequate length scale thus provide a direct way of studying such solvent exchange events around ions in molecular detail.
Some accelerationist remarks on Marcuse’s drives theory and his dialectics of civilization
- Andrzej Karalus
2022 Pełny tekst Analiza i Egzystencja
Marcuse’s theory of civilization offers a promising Freud-Marx synthesis. His approach, best articulated in Eros and Civilization, aims at a thorough reformulation of the Freudian drive doctrine to render it more historical and concatenate it to the problem of structural violence and the institutionalized (and internalized) mechanism of repression. I claim that the said reformulation provides a cornerstone for Marcuse’s highly idiosyncratic variant of a critical theory, which, according to my interpretation, possesses clear proto-accelerationist undertones. The article offers a concise recapitulation of Marcuse’s “dialectics of civilization” and points at the somewhat surprising close convergences with the accelerationist version of postcapitalism in his reflection on politics, technology, and the role of arts and aesthetic imagination in challenging the affirmative (desublimating) character of culture.
Some new soliton solutions to the higher dimensional Burger–Huxley and Shallow water waves equation with couple of integration architectonic
- Farrah Ashraf
- Tehsina Javeed
- Romana Ashraf
- Amina Rana
- Ali Akgül
- Shahram Rezapour
- Muhammad Bilal Hafeez
- Marek Krawczuk
2022 Pełny tekst Results in Physics
In this paper, we retrieve some traveling wave, periodic solutions, bell shaped, rational, kink and anti-kink type and Jacobi elliptic functions of Burger’s equation and Shallow water wave equation with the aid of various integration schemes like improved -expansion scheme and Jacobi elliptic function method respectively. We also present our solutions graphically in various dimensions.
Sources and composition of chemical pollution in Maritime Antarctica (King George Island), part 1: Sediment and water analysis for PAH sources evaluation in the vicinity of Arctowski station
- Joanna Potapowicz
- Małgorzata Szopińska
- Danuta Szumińska
- Robert Józef Bialik
- Żaneta Polkowska
2022 Pełny tekst CHEMOSPHERE
The paper presents a study regarding the identification of polycyclic aromatic hydrocarbons (PAHs) in fresh waters and surface sediments on the western shore of Admiralty Bay over four sampling seasons from 2017 to 2018. The results were compared to literature data from 2016 to provide a more comprehensive image of the environmental fate of PAHs over the years. The highest value of Σ PAHs was 82.9 ng/L and 445 ng/g dw in water and sediment samples, respectively. The analysis of PAH indicator ratio values showed that pyrogenic or mixed sources contribute to the PAH pollution in Antarctic sediments and water more than does petroleum. The main source is the combustion of biomass (e.g. as a result of fires) and coal, and PAHs are mostly associated with the activity of stations or are transported to a lesser extent by long-range atmospheric transport (LRAT) from South America. The values of the ΣLMW/ΣHMW ratio in sediments indicate that petrogenic sources contribute to PAH contamination, but among the six PAH ratios tested, petrogenic sources were identified as dominant in approximately 17–19% of cases. Lack of coherence in the obtained results confirms the mixed origin of PAHs in the studied samples. Although the differentiation of PAHs sources is still ambiguous, caution is recommended in light of the Antarctic system's evident and rapid response to global and local PAH emissions, and the dependency of accumulation and release cycle processes on weather conditions. A reduction in petrol usage in favour of renewable energy sources, and restriction of tourism are strongly recommended for better preservation of the pristine Antarctic environment.
Spatiotemporal Assessment of Satellite Image Time Series for Land Cover Classification Using Deep Learning Techniques: A Case Study of Reunion Island, France
- Naik Nitesh Navnath
- Kandasamy Chandrasekaran
- Andrzej Stateczny
- Venkatesan Meenakshi Sundaram
- Prabhavathy Panneer
2022 Pełny tekst Remote Sensing
Current Earth observation systems generate massive amounts of satellite image time series to keep track of geographical areas over time to monitor and identify environmental and climate change. Efficiently analyzing such data remains an unresolved issue in remote sensing. In classifying land cover, utilizing SITS rather than one image might benefit differentiating across classes because of their varied temporal patterns. The aim was to forecast the land cover class of a group of pixels as a multi-class single-label classification problem given their time series gathered using satellite images. In this article, we exploit SITS to assess the capability of several spatial and temporal deep learning models with the proposed architecture. The models implemented are the bidirectional gated recurrent unit (GRU), temporal convolutional neural networks (TCNN), GRU + TCNN, attention on TCNN, and attention of GRU + TCNN. The proposed architecture integrates univariate, multivariate, and pixel coordinates for the Reunion Island’s landcover classification (LCC). the evaluation of the proposed architecture with deep neural networks on the test dataset determined that blending univariate and multivariate with a recurrent neural network and pixel coordinates achieved increased accuracy with higher F1 scores for each class label. The results suggest that the models also performed exceptionally well when executed in a partitioned manner for the LCC task compared to the temporal models. This study demonstrates that using deep learning approaches paired with spatiotemporal SITS data addresses the difficult task of cost-effectively classifying land cover, contributing to a sustainable environment.
Sperm segmentation and abnormalities detection during the ICSI procedure using machine learning algorithms
- Aleksandra Frączek
- Gabriela Karwowska
- Mateusz Miler
- Joanna Liss
- Anna Węsierska
- Magdalena Mazur-Milecka
2022
(1) About 15-20% of couples struggle with the problem of infertility. 30 to 40% of these cases are caused by abnormalities in the structure and motility of sperm. Sometimes the only possibility for such people is to use the procedure of artificial insemination. CASA systems are used to increase the efficiency of this procedure by selecting the appropriate sperm cell. (2) This paper presents an approach to the sperm classification on the basis of its entire structure analysis, including flagella - often poorly visible and therefore ignored in the CASA systems element. The training of the Mask R-CNN architecture was performed on 2 publicly available and one specially created for this purpose sperm database. A 14-element feature vector was also proposed for the classification of 4 classes of typical head defects (amorphous, normal, tapered and pyriform) by the Support Vector Machine. (3) The sperm head (mAP 94.28%) and the whole flagellum (mAP 90.29%) were successfully detected. However, the flagella segmentation results were significantly lower (50.88%) than that the head segmentation (88.32%). Classification with SVM scored 82% accuracy. (4) Research has shown that segmentation and the use of a simple SVM classifier allow for quite good results in the classification of sperm defects. However, it is important to develop a larger whole sperm database, to improve the segmentation results.
Spiral Search Grasshopper Features Selection with VGG19-ResNet50 for Remote Sensing Object Detection
- Andrzej Stateczny
- G. Uday Kiran
- G. Bindu
- Kanegonda Ravi Chythanya
- K. Ayyappa Swamy
2022 Pełny tekst Remote Sensing
Remote sensing object detection plays a major role in satellite imaging and is required in various scenarios such as transportation, forestry, and the ocean. Deep learning techniques provide efficient performance in remote sensing object detection. The existing techniques have the limitations of data imbalance, overfitting, and lower efficiency in detecting small objects. This research proposes the spiral search grasshopper (SSG) optimization technique to increase the exploitation in feature selection. Augmentation is applied in input images to generate more images, and this helps to train the model and reduces data imbalance problems. The VGG-19 and ResNet50 model is applied for feature extraction, and this helps to extract deep features to represent objects. The SSG feature selection technique increases the exploitation and select unique features for object detection that helps to overcome the data imbalance and overfitting problem. The SSG feature selection model helps to balance the exploration and exploitation that escape from the local optima trap. The SSG model has 82.45% mAP, the SSD model has 52.6% mAP, and the MPFP-Net model has 80.43% mAP.
Społeczność akademicka świętuje Tydzień Otwartego Dostępu 2022
- Kamila Kokot-Kanikuła
- Agnieszka Szymik
2022 Pełny tekst Pismo PG
W dniach 24-30 października 2022 roku odbyła się kolejna odsłona święta Otwartego Dostępu pod hasłem „Otwartość dla sprawiedliwości klimatycznej”. Jak co roku w ostatni pełny tydzień października, Biblioteka Politechniki Gdańskiej zorganizowała dla społeczności akademickiej szereg atrakcji, które miały na celu promowanie idee otwartości wśród naukowców i studentów.
Spurious Modes in Model Order Reduction in Variational Problems in Electromagnetics
- Valentin De La Rubia
- David Young
- Grzegorz Fotyga
- Michał Mrozowski
2022 IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
In this work, we address an everlasting issue in 2 model order reduction (MOR) in electromagnetics that has 3 remained unnoticed until now. Contrary to what has been 4 previously done, we identify for the very first time spurious 5 modes in MOR for time-harmonic Maxwell’s equations and 6 propose a methodology to remove their negative influence on the 7 reduced order model (ROM) response. These spurious modes 8 have nonzero resonance frequency and may have shown up 9 in the past giving rise to spikes in the frequency response, 10 in effect, deteriorating the accuracy and efficiency of the MOR 11 process. However, they were never characterized as spurious 12 mode contributions, rather they were most likely considered 13 as poor localized approximation issues in the MOR process. 14 When we try to get further physical insights from the ROM, 15 rather than simple frequency domain data, we cannot afford 16 any poorly localized approximation issue, that is, any spurious 17 mode in the band of analysis. Otherwise, these mathematical, 18 but nonphysical, modes will mislead the physical behavior of the 19 device under analysis. A computationally inexpensive variational 20 divergence condition is established to identify spurious modes in 21 the band of analysis, since any physical in-band mode must be 22 divergence-free. In addition, once a spurious mode is identified in 23 the band of analysis, its influence is removed from the ROM by 24 a physics-based coupling strategy. As a result, a robust spurious 25 mode contribution-free MOR in electromagnetics is proposed. 26 Finally, several actual microwave circuits, such as a quad-mode 27 filter and a triple-mode triple-band filter, will illustrate the 28 capabilities and efficiency of the proposed approach.
Stability investigation of the PCM nanocomposites
- Paulina Boroń
- Maciej Fabrykiewicz
- Janusz Cieśliński
2022
In present study was showed the results of research the stability of nanoPCMs in terms of types and concentrations of surfactant used. For stearic acid has been added PVP or oleic acid in concentrations of 0%, 5% and 10%. Nanoparticles TiO2 and Al-2O3 in concentration of 1% were chosen to be researched in this test. The mixing of nanocomposites has been done in an ultrasonic scrubber in which the samples were placed for 45 mins. The stability was researched through the measurement the changing of temperature over time. The measurements have been done in controlled thermostatic conditions. The results were obtained after clotting the samples from 70°C to 20°C and melting the samples form 20°C to 70°C. The expected results was obtaining plot waveforms with reduced loading time for materials containing surfactants and nanoparticles at their core.
Stan przedawaryjny oraz sposób naprawy dźwigarów dachowych z drewna klejonego
- Maciej Niedostatkiewicz
- Tomasz Majewski
2022 Pełny tekst
W artykule przedstawiono opis uszkodzeń konstrukcji dachu sali sportowej, w szczególności drewnianych dźwigarów dachowych z drewna klejonego, które powstały w wyniku popełnionych błędów projektowych oraz wykonawczych. W pracy przedstawiono różne koncepcje naprawy oraz zrealizowane rozwiązanie projektowe wzmocnienia dźwigarów dachowych.
Stan przedawaryjny oraz sposób naprawy dźwigarów dachowych z drewna lejonego
- Maciej Niedostatkiewicz
- Tomasz Majewski
2022
W artykule przedstawiono opis uszkodzeń konstrukcji dachu sali sportowej w szczególności drewnianych dźwigarów dachowych z drewna klejonego które powstały w wyniku popełnionych błędów projektowych oraz wykonawczych. W pracy przedstawiono różne koncepcje naprawy oraz zrealizowane rozwiązanie projektowe wzmocnienia dźwigarów dachowych.
Stardust - Investigation of Microbes in the Stratosphere
- Marcin Jasiukowicz
- Bartosz Rybacki
- Mateusz Grzybowski
- Natalia Czortek
- Dawid Rekowski
- Jakub Pawłowski
- Paulina Podpirko
- Kacper Loret
- Dominika Tomaszewska
- Szymon Magrian
- Karol Pelzner
- Remigiusz Galikowski
- Bartosz Rybak
- Beata Krawczyk
2022 Pełny tekst
The stratospheric microbiome has been investigated several times using the methods of classical microbiology. In this experiment, we have combined them with some novel approaches including whole- metagenome amplification, Maldi TOF mass spectrometry and Sanger DNA sequencing. The results of the experiment may provide the scientists with knowledge about the mechanisms of survivability of microorganisms in stratospheric conditions such as high doses of UV and cosmic radiation, low temperature and low humidity. The preliminary results have shown that the stratosphere is very poor in microorganisms in comparison to the regular, tropospheric air. Also the investigation is very difficult due to many problems with both small amounts of biological material and the high risk of contamination. However, contamination is possible to control, and modern methods of biotechnology help in the research of low quantities of material. The experiment was launched from Esrange Space Center in September 2021, onboard BEXUS 30 balloon mission conducted within the REXUS/BEXUS programme.
Starodruki w cyfrowej odsłonie – Biblioteka PG zrealizowała projekt Ministerstwa Edukacji i Nauki
- Anna Sobolewska
- Kamila Kokot-Kanikuła
2022 Pismo PG
Biblioteka Politechniki Gdańskiej ukończyła właśnie realizację projektu „Społeczna Odpowiedzialność Nauki” w ramach modułu „Wsparcie dla bibliotek naukowych”. Projekt realizowany był w ramach konkursu ogłoszonego w 2019 roku przez Ministerstwo Edukacji i Nauki.
State tax policy and reform tools as a risk of running a business. Case study based on Polski Ład – Polish tax reform
- Ewa Łączek-Tarazewicz
- Jarosław Wróblewski
- Piotr Kasprzak
- Gabriela Golawska-Witkowska
2022
The aim of the article is to describe and present the Polish tax reform introduced at the beginning of 2022. Tax changes introduced in Poland had a strong impact on the risk of running a business in Poland because in their assumption they directly changed the rules of running a business. Due to the pace of the introduced changes, as well as the scope of the reform, the new tax law was subject to numerous criticisms of taxpayers in Poland (especially entrepreneurs). Although in its initial assumptions, the program of changes entitled The Polish Deal (“Polski Ład) was aimed not only at changing the tax law, but also introducing numerous investment programs as a response to the COVID-19 post-pandemic reality. The article attempts to assess the risk associated with the change of tax law from the point of view of enterprises from the SME sector, and presents the most important assumptions related to the change in the law, as well as the consequences of their introduction.
Statistics with R A Handbook for Statistical Analysis with R and R-Studio
- Karol Flisikowski
2022
If you are to perform any kind of data (statistical) analysis and use tools in the data science ecosystem, you may have seen a variety of tutorials, handbooks online (I’m not mentioning traditional bibles of statistics). Unfortunately most of them is written intentionally for specific purposes and/or target group of people and does not include many aspects, data types, difficult aspects, usually hiding them trying to solve theoretical problems of the matter. In this handbook I am not going to omit any of them. What is more, those, which are more problematic for data analyst will be underlined, explained in details, solved with the use of the newest libraries available at the time. Users who believe Python is the best tool for statistical analyses, probably might see some R advantages in the end of the study. We will start with preparing infrastructure for the analysis. Then, the quick tour through the R programming basics. Finally, two most important chapters of this book will walk you through the descriptive and inferential statistical data analysis. Online version is interactive: it means in many places reader will have the chance to go through tutorials, answer some questions, solve some tasks to go to the next page.
Stirling engines - the state of technology development and computational models
- Mariusz Furmanek
- Jacek Kropiwnicki
2022 Pełny tekst Combustion Engines
Stirling engines represent a technologically important solution in combined heat and power systems. Their use enables the achievement of over 90 percent efficiency in the management of the primary energy source with a very high durability of the device, mainly due to the lack of contact of the working gas with external factors and a very small number of mechanical components. The use of a Stirling engine may be equally important when applying renewable energy sources or waste heat from other processes. The first part of the work presents an overview of available commercial Stirling engine solutions. The second part of the work presents an overview of numerical models of Stirling engine operation, which enable the correct selection of the main geometrical features of the devices and the improvement of the structure in order to maximize efficiency or power.
Stock price reactions to an arrangement approval in restructuring proceedings – the case of Poland
- Błażej Prusak
- Marcin Potrykus
2022 Pełny tekst International Journal of Management and Economics
The study aims to empirically analyze the reaction of stock prices to the information about the conclusion and acceptance of a debtor–creditor arrangement under restructuring proceedings of companies listed on the stock exchange in Poland. The following main research hypothesis was verified: public disclosure of information about an arrangement conclusion and acceptance in restructuring proceedings results in above-average rates of return due to investments in the stocks of these entities in the short term. Three events were assessed: the public disclosure of information about the conclusion of a debtor–creditor arrangement (Event 1), its approval by a court (Event 2), and the decision becoming final (Event 3). The research method applied was the event study. Event 1 and Event 3 leads to an above-average and statistically significant increase in stock prices on the day of the event. In contrast, no statistically significant above-average rates of return accompanied Event 2.
Stocznia. Człowiek. Przemysł. Miasto
- Krzysztof Wróblewski
2022
Pierwsza kompleksowa wystawa o historii państwowego przemysłu stoczniowego w Gdańsku, ponad 150 lat dziejów miasta – od połowy XIX wieku, kiedy powstała pierwsza stocznia państwa pruskiego w Gdańsku, poprzez historię dwóch wojen światowych, Stoczni Gdańskiej w czasach komunizmu do współczesności. Wystawa opowiada z perspektywy doświadczenia przemysłu stoczniowego w Gdańsku polityczną, społeczną i kulturową historię Polski i Europy. W centrum opowieści wystawy są losy ludzi, a nie statków. Eksponaty pochodzą od niemal 40 instytucji i osób prywatnych, z Polski i zagranicy. Korzystaliśmy m.in. ze zbiorów Archiwum Państwowego w Gdańsku, PAN Biblioteki Gdańskiej, Muzeum Gdańska, Muzeum Narodowego w Gdańsku, Muzeum Stutthof w Sztutowie, Muzeum Narodowego w Szczecinie, Muzeum Zamoyskich w Kozłówce. Ekspozycja będzie także pierwszą okazją do szerszego zaprezentowania związanych z tym tematem zbiorów ECS.
Stocznia i Westerplatte - szkic
- Krzysztof Wróblewski
2022
Obraz odnosi się do dwóch miejsc historycznych w Gdańsku - Stoczni Gdańskiej oraz Westerplatte