2022 - Repozytorium publikacji - Politechnika Gdańska

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Bayesian Optimization for solving high-frequency passive component design problems
- Michał Baranowski
- Grzegorz Fotyga
- Adam Lamęcki
- Michał Mrozowski
2022 Pełny tekst Bulletin of the Polish Academy of Sciences-Technical Sciences
In this paper, the performance of the Bayesian Optimization (BO) technique applied to various problems of microwave engineering is studied. Bayesian optimization is a novel, non-deterministic, global optimization scheme that uses machine learning to solve complex optimization problems. However, each new optimization scheme needs to be evaluated to find its best application niche, as there is no universal technique that suits all problems. Here, BO was applied to different types of microwave and antenna engineering problems, including matching circuit design, multiband antenna and antenna array design, or microwave filter design. Since each of the presented problems has a different nature and characteristics such as different scales (i.e. number of design variables), we try to address the question about the generality of BO and identify the problem areas for which the technique is or is not recommended
Behavior of residual current devices at earth fault currents with DC component
- Stanisław Czapp
- Hanan Tariq
- Sławomir Cieślik
2022 Pełny tekst SENSORS
Low-voltage electrical installations are increasingly saturated with power electronic converters. Due to very high popularity of photovoltaic (PV) installations and the spread of electric vehicles (EV) as well as their charging installations, DC–AC and AC–DC converters are often found in power systems. The transformerless coupling of AC and DC systems via power electronic converters means that an electrical installation containing both these systems should be recognized from the point of view of earth fault current waveform shapes. In such installations, various shapes of the earth fault current may occur – a DC component of a high value may especially flow. The DC component included in the earth fault current influences the tripping threshold of residual current devices (RCDs) – the devices which are mandatory in certain locations. This paper presents results of the AC-type, A-type, and F-type RCDs sensitivity testing under residual currents of various compositions of the DC component. This testing has shown that the DC component may both degrade and improve the sensitivity of RCDs. Moreover, unexpected positive behaviors of RCDs in some circumstances under DC residual current is discussed. Therefore, recognizing the real sensitivity and behavior of RCDs from the point of view of the DC component is important for effective protection against electric shock, in particular, in PV installations and EV charging systems. The research results provide a new insight into the real behavior of RCDs in modern power systems and, consequently, the safety of people.
Benchmarking the Digital Government Value Chain
- Jaromir Durkiewicz
- Tomasz Janowski
2022
Digital Government (DG) benchmarking is an academically vivid topic and, equally important, a tool with the potential to provide valuable insights to policymakers and public managers responsible for digital policies at the level of countries and international bodies. Alas, this potential remains largely untapped in the current DG benchmarking practice. In our study, we identify the reasons and propose a way of mitigating them. By referring to the managerial roots of benchmarking – to identify a unit’s problems and help it find a way toward performance improvements, we postulate to: 1) extract information coming from various measurement projects, 2) apply a process perspective to DG measurement – DG follows a series of value-generating transitions comprising a value chain, and 3) map the results to particular managerial or policy problems. We argue that the outcome, a comprehensive framework for country-level DG benchmarking built upon existing DG measurement instruments, offers a much higher diagnostic value than if such instruments are applied individually.
Biblioteka PG kontynuuje program digitalizacji i konserwacji. Kolejne tomy do renowacji z Programu Ministerstwa Edukacji i Nauki
- Kamila Kokot-Kanikuła
- Anna Sobolewska
2022 Pismo PG
Biblioteka Politechniki Gdańskiej ponownie otrzymała dofinansowanie na realizację projektu „Społeczna Odpowiedzialność Nauki". Celem projektu w ramach modułu „Wsparcie dla bibliotek naukowych” ogłoszonego przez Ministra Edukacji i Nauki jest konserwacja, digitalizacja i udostępnienie 16 woluminów z kolekcji zbiorów historycznych Biblioteki Politechniki Gdańskiej. Wartość projektu to 116 239,20 zł, a jego całkowity koszt wraz z wkładem finansowym Politechniki Gdańskiej to 126 472,00 zł.
Bioactive hybrid metal-organic framework (MOF)-based nanosensors for optical detection of recombinant SARS-CoV-2 spike antigen
- Navid Rabiee
- Yousef Fatahi
- Sepideh Ahmadi
- Nikzad Aabbariki
- Amirhossein Ojaghi
- Mohammad Rabiee
- Fatemeh Radmanesh
- Rassoul Dinarvand
- Mojtaba Bagherzadeh
- Ebrahim Mostafavi
- Milad Ashrafizadeh
- Pooyan Makvandi
- Eder C. Lima
- Mohammad Saeb
2022 SCIENCE OF THE TOTAL ENVIRONMENT
Fast, efficient, and accurate detection of SARS-CoV-2 spike antigen is pivotal to control the spread and reduce themortality of COVID-19. Nevertheless, the sensitivity of available nanobiosensors to detect recombinant SARS-CoV-2 spike antigen seems insufficient. As a proof-of-concept, MOF-5/CoNi2S4 is developed as a low-cost, safe, and bioactive hybrid nanostructure via the one-pot high-gravity protocol. Then, the porphyrin, H2TMP, was attached to the surface of the synthesized nanomaterial to increase the porosity for efficient detection of recombinant SARS-CoV-2 spike antigen. AFMresults approved roughness in different ranges, including 0.54 to 0.74 μm and 0.78 to≈0.80 μm, showing good physical interactions with the recombinant SARS-CoV-2 spike antigen. MTT assay was performed and compared to the conventional synthesis methods, including hydrothermal, solvothermal, and microwave-assisted methods. The synthesized nanodevices demonstrated above 88%relative cell viability after 24 h and even 48 h of treatment. Besides, the ability of the synthesized nanomaterials to detect the recombinant SARS-CoV-2 spike antigen was investigated, with a detection limit of 5 nM. The in-situ synthesized nanoplatforms exhibited low cytotoxicity, high biocompatibility, and appropriate tunability. The fabricated nanosystems seempromising for future surveys as potential platforms to be integrated into biosensors.
Biochemical, Structural Analysis, and Docking Studies of Spiropyrazoline Derivatives
- Angelika Adamus-Grabicka
- Mateusz Daśko
- Pawel Hikisz
- Joachim Kusz
- Magdalena Malecka
- Elzbieta Budzisz
2022 Pełny tekst INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
In this study, we evaluated the antiproliferative potential, DNA damage, crystal struc‐ tures, and docking calculation of two spiropyrazoline derivatives. The main focus of the research was to evaluate the antiproliferative potential of synthesized compounds towards eight cancer cell lines. Compound I demonstrated promising antiproliferative properties, especially toward the HL60 cell line, for which IC50 was equal to 9.4 μM/L. The analysis of DNA damage by the comet assay showed that compound II caused DNA damage to tumor lineage cells to a greater extent than compound I. The level of damage to tumor cells of the HEC‐1‐A lineage was 23%. The determination of apoptotic and necrotic cell fractions by fluorescence microscopy indicated that cells treated with spiropyrazoline‐based analogues were entering the early phase of programmed cell death. Com‐ pounds I and II depolarized the mitochondrial membranes of cancer cells. Furthermore, we per‐ formed simple docking calculations, which indicated that the obtained compounds are able to bind to the PARP1 active site, at least theoretically (the free energy of binding values for compound I and II were −9.7 and 8.7 kcal mol−1, respectively). In silico studies of the influence of the studied com‐ pounds on PARP1 were confirmed in vitro with the use of eight cancer cell lines. The degradation of the PARP1 enzyme was observed, with compound I characterized by a higher protein degrada‐ tion activity.
Biocomposites from recycled resources as candidates for laboratory reference material to validate analytical tools used in organic compounds emissions investigation
- Mariusz Marć
- Małgorzata Rutkowska
- Aleksander Hejna
- Mateusz Barczewski
2022 Pełny tekst BUILDING AND ENVIRONMENT
A suitably chosen reference material should meet specific criteria like representing one of the compound classes most commonly occurring in indoor materials as well as having optimal long-term stability during storage and transport to its destination point and having a compact size. The described interdisciplinary pilot research was aimed to develop and characterize a polymer-based candidate for the laboratory reference material (LRM) of selected representatives of monoaromatic hydrocarbons (toluene and furfural) and terpenes emissions. Recycled, petroleum-based low-density polyethylene (LDPE) was applied as a matrix and was filled with plant-based wastes, such as apple pomace (AP), sunflower husks (SH), or yerba mate (YM) residues. The performance and suitability of the developed candidate for use as laboratory reference material was analyzed using FT-IR spectroscopy and differential scanning calorimetry (DSC). The migration potential of the representatives of monoaromatic hydrocarbons and terpenes emitted from the developed polymer material was assessed using the stationary emission microchamber system (μ-CTE 250). In the case of candidates for LRM with the addition of YM and AP, a clear relationship was observed between the samples seasoning time in the chamber and the total amount of VOCs released into the gaseous phase, including identified and determined representatives of terpenes. Furthermore, the existence of a clear relationship between the size (intensity) of the emission defined by the calculated summary parameters (TVOCs and sum of terpenes) and the seasoning/conditioning temperature of polymeric materials with bioadditives was observed.
Biodegradable Polymer Packaging Materials in Seawater Environment
- Helena Janik
- Justyna Kucińska-Lipka
- Maciej Sienkiewicz
- Alicja Kosakowska
2022
In this chapter, our interest is directed into dea/ocean/lakes biodegradable environment for polymer packaging materials from two different points of view.
Bio‑derived polyurethanes obtained by non‑isocyanate route using polyol‑based bis(cyclic carbonate)s—studies on thermal decomposition behavior
- Paulina Parcheta-Szwindowska
- Kamila Rohde
- Janusz Datta
2022 Pełny tekst JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
Non-isocyanate polyurethanes (NIPUs) constitute one of the most prospective groups of eco-friendly materials based on their phosgene-free synthesis pathway. Moreover, one of the steps of their obtaining includes the use of carbon dioxide (CO 2 ), which allows for the promotion of the development of carbon dioxide capture and storage technologies. In this work, non- isocyanate polyurethanes were obtained via three-step synthesis pathway with the use of epichlorohydrin. In the I step, the addition reaction of epichlorohydrin with polyhydric alcohols was conducted for diglicydyl ethers obtaining. In the II step carbon dioxide reacted with diglicydyl ethers to obtain five-membered bis (cyclic carbonate)s in the cycloaddition reaction. Then, one-pot polyaddition reaction between bis (cyclic carbonate) and dimerized fatty acids-based diamine allowed for non-isocyanate polyurethanes (NIPU)s preparation. Three bio-based materials (two semi-products and one bio-NIPU) and three petrochemical-based materials (two semi-products and one NIPU) were obtained. The selected properties of the products of each step of NIPUs preparation were compared. Fourier transform infrared spectroscopy FTIR and proton nuclear magnetic resonance 1 H NMR measurements allowed to verify the chemical structure of all obtained products. The average molecular masses of the semi-products were measured with the use of size exclusion chromatography SEC. Moreover, thermal stability and thermal degradation kinetics were determined based on thermogravimetric analysis TGA. The results confirmed that the activation energy of thermal decomposition was lower for semi-products and NIPUs prepared with the use of petrochemical-based epichlorohydrin than for their bio-based counterparts.
Biological and mechanical research of titanium implants covered with bactericidal coating
- Klaudia Malisz
- Beata Świeczko-Żurek
2022 Pełny tekst Engineering of Biomaterials / Inżynieria Biomateriałów
The paper concerns the biological and mechanical properties of titanium implants with an antibacterial coating. The Ti13Zr13Nb alloy samples were coated with hydroxyapatite (HAp) coatings using the electrophoretic deposition technique (EPD). Subsequently, the surface of the samples was modified with silver, copper, and nickel nanoparticles by the immersion method. Different titanium sample types (i.e. HAp-only and nanometals-enriched coatings) were placed in a bacterial solution for a period of one month. Each sample was examined using scanning electron microscopy (SEM), nanoindentation, nanoscratch, and contact angle tests. The significant amount of dead biofilm on the surface proves the effectiveness of antibacterial activity. The wettability assessment showed that the samples were hydrophilic. The conducted tests of mechanical properties indicate the heterogeneity of the coatings
Biomedical engineering of polysaccharide-based tissue adhesives: Recent advances and future direction
- Hanieh Shokrani
- Amirhossein Shokrani
- Farzad Seidi
- Muhammad Tajammal Munir
- Navid Rabiee
- Yousef Fatahi
- Justyna Kucińska-Lipka
- Mohammad Saeb
2022 Pełny tekst CARBOHYDRATE POLYMERS
Tissue adhesives have been widely used for preventing wound leaks, sever bleeding, as well as for enhancing drug delivery and biosensing. However, only a few among suggested platforms cover the circumstances required for high-adhesion strength and biocompatibility, without toxicity. Antibacterial properties, controllable degradation, encapsulation capacity, detectability by image-guided procedures and affordable price are also centered to on-demand tissue adhesives. Herein we overview the history of tissue adhesives, different types of polysaccharide-based tissue adhesives, their mechanism of gluing, and different applications of polysaccharide-based tissue adhesives. We also highlight the latest progresses in engineering of tissue adhesives followed by existing challenges in fabrication processes. We argue that future studies have to place focus on a holistic understanding of biomaterials and tissue surface properties, proper fabrication procedures, and development of magnetic and conductive responsive adhesives in order to bridge the huge gap between the present studies for clinical implementation.
Biometric identity verification
- Maciej Smiatacz
2022
This chapter discusses methods which are capable of protecting automatic speaker verification systems (ASV) from playback attacks. Additionally, it presents a new approach, which uses computer vision techniques, such as the texture feature extraction based on Local Ternary Patterns (LTP), to identify spoofed recordings. We show that in this case training the system with large amounts of spectrogram patches may be difficult, and concentrate on feature engineering issues. The goal is to make the algorithm independent from the contents of the training set as much as possible; we look for the descriptors that would allow the method to detect attacks performed in an environment entirely different from the training one and with the use of the equipment that differs considerably from the devices that captured the training samples. The final form of the new method performs significantly better than the reference Textrogram algorithm.
BJS-03 DO WE NEED FIXATION OF THE MESH IN LAPAROENDOSCOPIC TECHNIQUES FOR M3 INGUINAL DEFECTS? AN EXPERIMENTAL STUDY
- Mateusz Zamkowski
- Agnieszka Tomaszewska
- Izabela Lubowiecka
- Krzysztof Karbowski
- Maciej Śmietański
2022 BRITISH JOURNAL OF SURGERY
The authors conducted a research experiment to verify the hypothesis that it is possible to preserve the mesh in the operating field in large direct hernias (M3) without the need to use fixing materials. The results showed that mesh fixation is not the only alternative to preventing recurrence in complex defects and that the type of implant seems to be a key factor from the point of view of mechanics and biophysics.
Blockchain based Secure Data Exchange between Cloud Networks and Smart Hand-held Devices for use in Smart Cities
- Muneer Ahmad Dar
- Aadil Askar
- Sameer Ahmad Bhat
2022 Pełny tekst
In relation to smart city planning and management, processing huge amounts of generated data and execution of non-lightweight cryptographic algorithms on resource constraint devices at disposal, is the primary focus of researchers today. To enable secure exchange of data between cloud networks and mobile devices, in particular smart hand held devices, this paper presents Blockchain based approach that disperses a public/free key to save it on a block within a Blockchain. The proposed system generates public-private key pair to encrypt data digitally to allow data communication. This empowers communication devices to encipher data using keys stored in the Blockchain i.e. the public key. Generated cipher text can be decrypted/deciphered only with the respective private keys, meaning that only the communicating devices can obtain their own plain text in a data exchange process. Smart mobile employed in smart city can then encipher the data using the keys and store them on the cloud. The proposed system is able to decrease the number of overheads that relate to key generation, key delivery and key storage whilst providing solutions for data processing, information exchange and data over-collection, respectively. Thus, the study proposes a robust and secure solution to exchange keys and secure data communication based on Blockchain technology.
Błędy projektowe i wykonawcze przyczyną uszkodzeń posadzki antyelektrostatycznej
- Sylwia Świątek-Żołyńska
- Maciej Niedostatkiewicz
- Władysław Ryżyński
2022 Pełny tekst
: Koniczność odprowadzania ładunków elektrostatycznych z powierzchni posadzki czyli ochrona przed elektrycznością statyczną występuje w pomieszczeniach w których w wyniku prowadzonych procesów technologicznych lub magazynowania składowane są substancje łatwopalne lub wybuchowe, ponadto problematyka ta jest również bardzo istotna w przypadku prowadzenia procesów produkcyjnych gdzie niekontrolowane rozładowanie nagromadzonego potencjału elektrycznego może spowodować zniszczenie produkowanego elementu. W artykule przedstwiono opis przypadków uszkodzeń posadzek antyelektrostycznych które powstały w wyniku popełnianych błędów projektowych oraz wykonawczych. Artykuł zawiera również opis zastosownych rozwiązań mających na celu doprowadzenie posadzek do właściwego stanu technicznego, umożlwiającego ich użytkowanie zgodnie z pierwotnym przeznaczeniem.
Błędy projektowe przyczyną stabu awaryjnego żelbetowego zbiornika na koks
- Tomasz Majewski
- Maciej Niedostatkiewicz
2022 Pełny tekst
W artykule przedstawiono opis uszkodzeń konstrukcji otwartego prostopadłościennego żelbetowego zbiornika który stanowi element ciągu technologicznego produkcji koksu w zakładzie rafineryjnym. Występujące uszkodzenia zbiornika były następstwem istotnego błędu projektowego. W pracy przedstawiono koncepcję naprawy możliwej do przeprowadzenia w trakcie ciągłej pracy instalacji, z podziałem na etapy realizacji.
Born–Oppenheimer potential energy curves of NaK from the optimised atomic basis sets
- Klaudia Bączek
- Patryk Jasik
- Tymon Kilich
- Józef Sienkiewicz
2022 Pełny tekst MOLECULAR PHYSICS
The article presents adiabatic potential energy curves of the ground and excited electronic states for the diatomic NaK molecule. The calculations were made using the ab initio computational methods to include electron correlation. The studied molecule was calculated as the effective two-electron problem, in which only the valence electrons of the molecule are explicitly taken into account. The remaining electrons with atomic nuclei are described with appropriate, energy-consistent relativistic pseudopotentials. Additionally, a bespoke basis set, generated and optimised for both ground and excited electronic states of the NaK system was developed. The spectroscopic parameters of the calculated potential energy curves were determined and compared with the available experimental and theoretical results. The compliance of the obtained results, despite slight differences, is very satisfactory.
Boundary conditions for non-residential buildings from the user’s perspective: literature review
- Natalia Sokół
- Julia Kurek
- Justyna Martyniuk-Pęczek
- Claudia Naves David Amorim
- Natalia Giraldo Vasquez
- Julia Resende Kanno
- Sergio Sibilio
- Barbara Matusiak
2022 Pełny tekst ENERGY AND BUILDINGS
Background and objective: This paper aims to review the boundary conditions (B/C) in specific categories (energy, building use, and lighting) within non-residential buildings to pave the way to a better understanding of users’ requirements and needs of the built environment. For this paper, B/C are understood as unique preconditions, specific characteristics for use, determining specific features of buildings, enabling an accurate understanding of non-residential spaces concerning energy use, user behaviour, and lighting. Methods: This paper describes the results of an overall quantitative (1st method) review and a systematic review (2nd method) of boundary conditions and their factors within different types of non-residential buildings from the users’ perception. Followed by a qualitative experts’ literature review (3rd method) on B/C within offices, schools, and hospitals chosen by a team of international experts working together on Subtask A: User perspective and requirements, Task 61 IEA (International Energy Agency): Solutions for daylighting and electric lighting. . Results: The first review method led to the selection of 21 papers. The second method resulted in the selection of 7 papers out of 93,143 found in Scopus; during the 3rd review, experts collectively chose 74 additional papers focussing on the main and users factors contributing to specific B/C. The scope of this paper is limited only to offices, schools, and hospitals. Based on the findings, the authors recognise a broad definition of boundary conditions from specific values, and conditions to interconnected factors, user profiles, functions of the building types, and operating hours. Conclusions: This paper provides an overview of B/C factors found in the literature that can help explain the occupants’ behaviour and the use of spaces. B/C are often type of building/user/location/situation/simulation input-values and method-specific. Therefore, they cannot be widely applicable but offer patterns and help to understand the correlations between various factors shaping the built environment. A better comprehension of the reasons for identifying B/C and their factors can help in developing a deeper knowledge of how we use buildings to find optimal ways to design them
BP-EVD: Forward Block-Output Propagation for Efficient Video Denoising
- Piotr Kopa Ostrowski
- Efkleidis Katsaros
- Daniel Węsierski
- Anna Jezierska
2022 IEEE TRANSACTIONS ON IMAGE PROCESSING
Denoising videos in real-time is critical in many applications, including robotics and medicine, where varying light conditions, miniaturized sensors, and optics can substantially compromise image quality. This work proposes the first video denoising method based on a deep neural network that achieves state-of-the-art performance on dynamic scenes while running in real-time on VGA video resolution with no frame latency. The backbone of our method is a novel, remarkably simple, temporal network of cascaded blocks with forward block output propagation. We train our architecture with short, long, and global residual connections by minimizing the restoration loss of pairs of frames, leading to a more effective training across noise levels. It is robust to heavy noise following PoissonGaussian noise statistics. The algorithm is evaluated on RAW and RGB data. We propose a denoising algorithm that requires no future frames to denoise a current frame, reducing its latency considerably. The visual and quantitative results show that our algorithm achieves state-of-the-art performance among efficient algorithms, achieving from two-fold to two-orders-of-magnitude speed-ups on standard benchmarks for video denoising.
Breastfeeding as a regulating factor of the development of the intestinal microbiome in the early stages of life
- Bartosz Ostrowski
- Beata Krawczyk
2022 Pełny tekst EUROPEAN FOOD RESEARCH AND TECHNOLOGY
Since the first bacterial inhabitants of the human gastrointestinal tract were identified, a lot of research into the study of the human microbiome and its effects on health has been conducted. Currently, it is accepted that humans have a symbiotic relationship with the gut microbiome, though the specifics of this relationship are not well understood. The microbiome of neonates constantly changes and appears to influence many facets of the infant’s health and predisposition later in life. This review aims to show how the microbiome develops over time. We discuss its composition, origins and stages of development of microbiota, the possible health benefits of a proper neonatal microbiome, and the dangers associated with dysbiosis. We emphasize the shielding, modulating, and stimulating effects breast milk has on the infant microbiota. The methods commonly used for the study of microbiota are also discussed.