2023 - Repozytorium publikacji - Politechnika Gdańska

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Distinct hippocampal-prefrontal neural assemblies coordinate memory encoding, maintenance, and recall
- Aleksander Domanski
- Michał Kucewicz
- Eleonora Russo
- Mark D. Tricklebank
- J. Emma Robinson
- Daniel Durstewitz
- Matthew W. Jones
2023 Pełny tekst CURRENT BIOLOGY
Short-term memory enables incorporation of recent experience into subsequent decision-making. This processing recruits both the prefrontal cortex and hippocampus, where neurons encode task cues, rules, and outcomes. However, precisely which information is carried when, and by which neurons, remains unclear. Using population decoding of activity in rat medial prefrontal cortex (mPFC) and dorsal hippocampal CA1, we confirm that mPFC populations lead in maintaining sample information across delays of an operant nonmatch to sample task, despite individual neurons firing only transiently. During sample encoding, distinct mPFC subpopulations joined distributed CA1-mPFC cell assemblies hallmarked by 4–5 Hz rhythmic modulation; CA1-mPFC assemblies re-emerged during choice episodes but were not 4–5 Hz modulated. Delay-dependent errors arose when attenuated rhythmic assembly activity heralded collapse of sustained mPFC encoding. Our results map component processes of memory-guided decisions onto heterogeneous CA1-mPFC subpopulations and the dynamics of physiologically distinct, distributed cell assemblies.
Distortion in the group of circle homeomorphisms
- Juliusz Banecki
- Tomasz Szarek
2023 Pełny tekst ERGODIC THEORY AND DYNAMICAL SYSTEMS
Let G be the group PAff+(R/Z) of piecewise affine circle homeomorphisms or the group Diff∞(R/Z) of smooth circle diffeomorphisms. A constructive proof that all irrational rotations are distorted in G is given.
Dis/Trust and data-driven technologies
- David Duenas Cid
- Stefano Calzati
2023 Pełny tekst Internet Policy Review
This concept paper contextualises, defines, and systematises the concepts of trust and distrust (and their interrelations), providing a critical review of existing literature so as to identify gaps, disjuncture, and continuities in the use of these concepts across the social sciences and in the context of the consolidation of the digital society. Firstly, the development of the concept of trust is explored by looking at its use in different disciplines —e.g. sociology, psychology, law, and management— and then confronted with that of distrust, often regarded—somewhat simplistically—as its opposite. Secondly, the review invites a reflection on the suitability of current definitions of trust and distrust when applied to the implementation of current data-driven technologies (dis/trust in technology) and their workings (dis/trust through technology). The discussion is relevant and timely, not only given the renewed interest in finding the touchpoints between dis/trust and digital-related issues but also to provide a benchmarking overview on this topic, which is still lacking in current literature.
Diving boldly into COVID‐19 contaminated wastewater: Eyes at nanotechnology‐assisted solutions
- Hussein Al-Hazmi
- Agata Kot-Wasik
- Amirhossein Shokrani
- Joanna Majtacz
- Vahid Vatanpour
- Muhammad Tajammal Munir
- Sajjad Habibzadeh
- Aleksander Hejna
- Mahnaz Hasanpour
- Abbas Mohammadi
- Sepideh Ahmadi
- Eder C. Lima
- Navid Rabiee
- Mohammad Saeb
2023 Pełny tekst Clinical and Translational Discovery
Several studies have been directed to find scalable, swift, accurate, and cost-effective strategies for detecting, monitoring, and treating coronavirus disease 2019 (COVID-19). Indeed, the lack of a fast and practical method for detecting the infected regions makes decision-making challenging to combat the critical pandemic-struck situations. The probable ‘wrong’, or rather inadequate, decisions not only have a boomerang effect on the economy but also can lead to an increase in the number of infected individuals, degree of hospitalization, and death counts. Although the current clinical methods are effective, they are costly, time-consuming, and, more particularly, inadequate because of the virus's mutation patterns. In addition, contamination of biomedical wastes with the COVID-19 virus is a matter of grave concern. Therefore, there is a perpetual need for novel methodologies to delineate the contaminated regions and determine whether those viruses contaminate the wastewater. Although several review papers have been recently published to discuss those concerns, there is a lack of a comprehensive survey of the detection and treatment of the COVID-19 virus in aqueous media. Herein, we review techniques available as spreading signifiers for detecting the COVID-19 virus in water resources and wastewater. We classify and integrate techniques into wastewater, sewage, and sludge detection and monitoring. Treatment of COVID-19-contaminated wastewater is discussed by classifying and ranking the methodologies nurtured from nanotechnology, including nanoparticle-based biosensors used in the detection and nanotechnology-based filtration systems for the removal of COVID-19 from wastewater. We also highlight the compilation of the detection methodologies in contaminated aqueous media and provide insight into the challenges associated with treating COVID-19-contaminated wastewater. The article concludes that international and robust guidelines for virus/bacteria treatment in wastewater are urgently needed to protect the environment and public health, where nanotechnology plays a key role.
Do Phenyl Substituents Affect the Properties of Azobenzocrown Derivatives?
- Ewa Wagner-Wysiecka
- Paulina Szulc
- Elżbieta Luboch
- Jarosław Chojnacki
- Dominika Laskowska
- Paulina Miklaszewska
- Paweł Sowiński
2023 Pełny tekst ChemPlusChem
New products of photo- and thermal rearrangements of 19-membered azoxybenzocrown with phenyl substituents in benzene rings in the para positions to oligooxyethylene fragments are characterized. The yields of photochemical transformations depend on the solvent. Para-hydroxyazocrown is formed with yields over 50% in propan-2-ol. Ortho-hydroxyazobenzocrown is obtained with yields up to 70% in toluene/acetic acid mixture. Macrocyclic Ph-20-ester is obtained in yield 90% under thermochemical rearrangement conditions. Structure of new hydroxyazobenzocrowns and also atypical product of rearrangements, 20-membered ester, was confirmed by X-ray diffraction analysis. Azophenol⇄quinone–hydrazone tautomeric equilibrium of new hydroxyazobenzocrowns and the influence of metal cations on tautomeric equilibrium was investigated using 1H NMR and UV-Vis spectroscopy in acetonitrile. The highest value of stability constant (logK 7.25) was obtained for strontium complex of p-hydroxyazobenzocrown. For the first time p-hydroxyazobenzocrown was used as a chromoionophore in the receptor layer of an optical sensor. Comparative analysis with data obtained previously for series 19-membered analogs have shown the influence of the presence of substituents in benzene rings for the course and products distribution of photo- and thermal rearrangement. The effect of substituents was also discussed against the tautomeric equilibrium and metal cation complexation properties.
Do the young employees perceive themselves as digitally competent and does it matter?
- Michał Tomczak
- Paweł Ziemiański
- Małgorzata Gawrycka
2023 Pełny tekst Central European Management Journal
Purpose – The study aims to examine the digital competence of young employees (under 30 years of age) who graduated from the technical university. Self-assessment of selected digital competencies was examined along with the determination of a self-efficacy level in the area of using digital competencies. Design/methodology/approach – Quantitative research was conducted using the computer-assisted web interview method on a sample of 4532 respondents. Findings – Young employees’ self-assessment of digital competencies and self-efficacy in the area of using them is high, and it can be assumed that they perceive themselves as digitally competent. Both digital self-efficacy and assessed digital competencies have a positive impact on satisfaction with the university. Research limitations/implications – The research sample consisted only of employees who graduated from the technical university, but the results may provide feedback on the demand for digital competencies sought in the labor market and constitute valuable information useful in university curriculum development and in vocational education and training. Originality/value – This is the first study that focuses on the Kozanoglu and Abedin approach to the concept of digital literacy in the context of research on self-assessment and self-efficacy in using digital competencies among technical university graduates, adapting the creative self-efficacy scale by Tierney and Farmer, for measuring digital self-efficacy.
Dobór głównych parametrów instalacji grzewczych spalinowych siłowni okrętowych z wykorzystaniem metod i modeli probabilistycznych
- Dominik Kreft
2023 Pełny tekst
Praca doktorska przedstawia nowatorską metodę projektowania okrętowych instalacji grzewczych. Metoda ta powstała dzięki analizie statystycznej danych zebranych z kilkunastu statków dotyczących między innymi wytwarzania pary w kotłach utylizacyjnych i zapotrzebowania na ciepło przez odbiorniki pary. Zaproponowany w pracy proces projektowy wykorzystuje równania korelacji wynikające z analizy statystycznej. Wytwarzanie ciepła oraz zapotrzebowanie na ciepło opisywano teoretyczną krzywą gęstości prawdopodobieństwa dla każdego ze statków. To pozwoliło przeprowadzić analizę korelacji i regresji parametrów rozkładów teoretycznych. Spoiwem procesu jest wykorzystanie teorii masowej obsługi oraz twierdzenia o splotach rozkładów Gaussa. W efekcie projektant siłowni okrętowych może w przystępny i klarowny sposób dobrać parametry urządzeń w okrętowym systemie grzewczym. Przewagą zaproponowanej metody nad obecnymi metodami deterministycznymi jest możliwość dobrania urządzeń o korzystniejszych parametrach (niższy koszt inwestycyjny i eksploatacyjny), spełniających oczekiwania zgodne z założonym poziomem prawdopodobieństwa.
Docierarki do płaszczyzn. Cz. II. Docierarki dwutarczowe.
- Adam Barylski
2023 Stal Metale & Nowe Technologie
Przedstawiono wsółczesne konstrukcje docierarek dwutarczowych do obróbki powierzchni płasko-równoległych. Omówiono kinematykę obiegowego układu wykonawczego obrabiarek dwutarczowych oraz tendencje rozwoju ich konstrukcji.
Docierarki do płaszczyzn. Cz.I. Docierarki jednotarczowe
- Adam Barylski
2023 Stal Metale & Nowe Technologie
Przedstawiono konstrukcje współcześnie produkowanych docierarek jednotarczowych do płaszczyzn. Omówiono standardową kinematykę układu wykonawczego tego typu docierarek.
Docierarki tarczowe do obróbki powierzchni płaskich i płasko-równoległych
- Adam Barylski
2023 Projektowanie i Konstrukcje Inżynierskie
Przedstawiono współczesne konstrukcje docierarek jednotarczowych do obróbki powierzchni płaskich oraz dwutarczowych do docierania powierzchni płasko-równoległych. Omówiono przykłady docierarek czołowych producentów. Przedstawiono konfigurację gniazda dwóch docierarek dwutarczowych oraz sposób załadunku i rozładunku obrabianych elementów.
do[my] w blok: wnętrza. projekty adaptacji mieszkań wystawa prac studenckich
- Agnieszka Kurkowska
- Kacper Ludwiczak
2023
Zaspa i Przymorze są aktualnie popularnymi, wysoko ocenianymi dzielnicami mieszkaniowymi. Bloki z lat 70. XX wieku to prefabrykowane, wielorodzinne budynki mieszkaniowe. Projekty studenckie pokazują, że mieszkania te mają potencjał wykreowania wygodnych zgodnych z bieżącymi trendami projektowymi, przestrzeni do zamieszkiwania, adaptowalnych do współczesnych oczekiwań. Zaprojektowane dla fikcyjnych mieszkańców wnętrza są podróżą po wyobrażeniach domu młodych ludzi – studentów IV semestru. Nadają drugie życie budynkom oraz inspirują do odważnego i przemyślanego projektowania wewnętrznej architektury domu.
"do[my] w bloku. projekt wnętrza"
- Agnieszka Kurkowska
- Kacper Ludwiczak
2023
Zaspa i Przymorze są aktualnie popularnymi, wysoko ocenianymi dzielnicami mieszkaniowymi. Bloki z lat 70. XX wieku to prefabrykowane, wielorodzinne budynki mieszkaniowe, których układy przestrzenne zdążyły się zdezaktualizować wobec dzisiejszych potrzeb ich mieszkańców. Projekty studenckie pokazują, że mieszkania te mają potencjał wykreowania wygodnych przestrzeni do zamieszkiwania, adaptowalnych do współczesnych oczekiwań. Zaprojektowane dla fikcyjnych mieszkańców wnętrza są podróżą po wyobrażeniach domu młodych ludzi – studentów IV semestru. Nadają drugie życie budynkom oraz inspirują do odważnego i przemyślanego projektowania wewnętrznej architektury domu.
"do[my] w bloku. projekt wnętrza"-plakat do wystawy
- Agnieszka Kurkowska
2023
plakat prezentuje graficznie założenia wystawianych projektów
Doskonalenie logistycznego łańcucha dostaw w usługach w ujęciu relacyjnym
- Martyna Kostrzewa
2023 Pełny tekst
W literaturze zagadnienia związane z modelami doskonałości zarządzania łańcuchem dostaw, modelami zarządzania relacjami, modelami doskonałości EFQM oraz obszarami logistycznymi funkcjonują rozłącznie. Opracowany model w postaci MAPY RELACJI pozwala na pokazanie jak wyglądają korelacje między obszarami logistycznymi, obszarami działalności w odniesieniu do modeli doskonałości EFQM, modelami doskonałości zarządzania łańcuchem dostaw i modelami zarządzania relacjami, jak w rzeczywistości wyglądałoby doskonalenie w danym obszarze, jak również, jakie problemy mogą wystąpić na miejscach styku między poszczególnymi składowymi tej mapy. Model jest narzędziem diagnostycznym i badawczym. Pozwala na ocenę bieżącego poziomu zaawansowania doskonałości zarządzania łańcuchem dostaw i zarządzania relacjami w tym łańcuchu oraz wskazanie dla zespołu przeprowadzającego proces doskonalenia zakres działań niezbędnych, aby uzyskać pożądany poziom zaawansowania, zarówno doskonałości zarządzania, jak i zarządzania relacjami w łańcuchu dostaw. Zaprezentowany model może być bardzo pomocnym narzędziem, które wypełnia lukę aplikacyjną w zakresie doskonalenia logistycznego łańcucha dostaw w usługach w ujęciu relacyjnym, gdyż stanowi on wytyczne uzyskania skutecznego i efektywnego funkcjonowania łańcucha dostaw na drodze budowania odpowiednich powiązań między ogniwami tego łańcucha.
Double-stage ORC system based on various temperature waste heat sources of the negative CO2 power plant
- Kamil Stasiak
- Paweł Ziółkowski
- Dariusz Mikielewicz
2023 Pełny tekst
Analysed is the modification of the thermodynamic cycle with the negative CO2 power plant concept by its combination with the organic Rankine cycle. The analysed power plant operates on a gas produced from the gasification of sewage sludge. The negative emission term comes from the aggregated CO2 balance resulting from the capture of the CO2, while the sewage sludge is one of the inevitable environmental sources of CO2 to be avoided. In short, the principle of this power plant is to produce electrical power by converting sewage sludge fuel as the substrate to CO2 as a product, which is an intricate process in-between, with many opportunities for waste heat recovery. There are four main sources of waste heat in such a system. One is the drying process of the producer gas, which must be properly cooled from the high temperature after gasification to the temperature at which no moisture is present in the gas. In the wet combustion chamber, the syngas is oxy-combusted under high temperatures with water injection to control the combustion temperature. This mixture is then expanded in the gas turbine. The mixture leaving the turbine is a major source of heat supply for the ORC. The second heat source is a mixture of steam and gas – a major supply of heat source for ORC. Next, the mixture is undergoing separation process in a cyclone separator and then the CO2 (with a small content of moisture) is directed to carbon capture unit. The CO2 is then compressed in a system that requires intercooling. Due to the wide range of temperatures of the listed waste heat sources, the double ORC combination is investigated. The combined ORC cycle is connected by a cascade heat exchanger. The ORC fluid parameters are selected computationally to match the temperature distribution lines. The power plant processes are simulated in the steady-state process simulator using the most accurate equations of state from the literature. Optimum operating conditions of the ORC integrated power plant are obtained through optimization techniques.
Driver’s Condition Detection System Using Multimodal Imaging and Machine Learning Algorithms
- Paulina Leszczełowska
- Maria Bollin
- Karol Lempkowski
- Mateusz Żak
- Jacek Rumiński
2023
To this day, driver fatigue remains one of the most significant causes of road accidents. In this paper, a novel way of detecting and monitoring a driver’s physical state has been proposed. The goal of the system was to make use of multimodal imaging from RGB and thermal cameras working simultaneously to monitor the driver’s current condition. A custom dataset was created consisting of thermal and RGB video samples. Acquired data was further processed and used for the extraction of necessary metrics pertaining to the state of the eyes and mouth, such as the eye aspect ratio (EAR) and mouth aspect ratio (MAR), respectively. Breath characteristics were also measured. A customized residual neural network was chosen as the final prediction model for the entire system. The results achieved by the proposed model validate the chosen approach to fatigue detection by achieving an average accuracy of 75% on test data
Driving forces of informal employment: An empirical study based on Polish enterprise data
- Dagmara Nikulin
2023 Pełny tekst Entrepreneurial Business and Economics Review
Objective: The article aims to indicate the determinants of informal employment in registered enterprises using company-level evidence from Poland. Research Design & Methods: The survey conducted among Polish small and medium-sized (SME) enterprises in 2018 was used to find the driving forces of informal employment in Poland. The adequate sample comprised 952 representative surveys derived from the computer-assisted telephone interview (CATI). The quantitative analysis was based on the logistic regression. Findings: The findings indicate that among the main drivers of informal employment, one can distinguish the level of tax morality of owners or company managers and the administrative difficulties related to setting up a business. The role of non-economic factors in creating informal activities was confirmed. Moreover, informal employment was more prevalent in smaller companies operating in the construction industry. Implications & Recommendations: Our analysis may be helpful for both research in entrepreneurship and tax evasion and the shadow economy stream. It indicates the heterogeneity among Polish enterprises related to the involvement in informal activities, particularly informal labour. Our study sheds light onto the less known dimension of ‘grey activities’ existing in the registered companies, which is less frequently analysed in the literature. Contribution & Value Added: This evidence will help us understand the primary motives for using the informal workforce and enhance further research on the nature and extent of informal employment and the shadow economy in general.
Driving the Image of an Electricity Supplier through Marketing Activities
- Dariusz Dąbrowski
- Jakub Dąbrowski
- Tomasz Zamasz
- Marcin Lis
2023 Pełny tekst Forum Scientiae Oeconomia
The aim of this study is to determine how marketing actions undertaken within the marketing mix by electricity providers influence their image. Referring to the Stimulus-Organism-Response (SOR) theory, research hypotheses were formulated, and a regression model was constructed, assuming positive impacts of selected marketing actions of electricity providers on their image. A quantitative approach was employed to test the research hypotheses. Data were collected through a questionnaire survey among randomly selected 503 domestic electricity consumers, and statistical analysis was used for data analysis. The research results indicate that the following marketing activities of electricity providers have a positive impact on their image: offering other products along with electricity, providing price discounts, providing physical customer service offices, and engagement in sponsorship.
Dual-Setting Bone Cement Based On Magnesium Phosphate Modified with Glycol Methacrylate Designed for Biomedical Applications
- Marcin Wekwejt
- Maryia Khamenka
- Anna Ronowska
- Uwe Gbureck
2023 Pełny tekst ACS Applied Materials & Interfaces
Magnesium phosphate cement (MPC) is a suitable alternative for the currently used calcium phosphates, owing to beneficial properties like favorable resorption rate, fast hardening, and higher compressive strength. However, due to insufficient mechanical properties and high brittleness, further improvement is still expected. In this paper, we reported the preparation of a novel type of dual-setting cement based on MPC with poly(2-hydroxyethyl methacrylate) (pHEMA). The aim of our study was to evaluate the effect of HEMA addition, especially its concentration and premix time, on the selected properties of the composite. Several beneficial effects were found: better formability, shortened setting time, and improvement of mechanical strengths. The developed cements were hardening in ∼16–21 min, consisted of well-crystallized phases and polymerized HEMA, had porosity between ∼2–11%, degraded slowly by ∼0.1–4%/18 days, their wettability was ∼20–30°, they showed compressive and bending strength between ∼45–73 and 13–20 MPa, respectively, and, finally, their Young’s Modulus was close to ∼2.5–3.0 GPa. The results showed that the optimal cement composition is MPC+15%HEMA and 4 min of polymer premixing time. Overall, our research suggested that this developed cement may be used in various biomedical applications.
Dynamic GPU power capping with online performance tracing for energy efficient GPU computing using DEPO tool
- Adam Krzywaniak
- Paweł Czarnul
- Jerzy Proficz
2023 Future Generation Computer Systems-The International Journal of Grid Computing-Theory Methods and Applications
GPU accelerators have become essential to the recent advance in computational power of high- performance computing (HPC) systems. Current HPC systems’ reaching an approximately 20–30 mega-watt power demand has resulted in increasing CO2 emissions, energy costs and necessitate increasingly complex cooling systems. This is a very real challenge. To address this, new mechanisms of software power control could be employed. In this paper, a dynamic new method of limiting software power is introduced on one of the latest NVIDIA GPUs: a software tool called the Dynamic Energy- Performance Optimiser (DEPO). DEPO minimizes the energy consumption of the CUDA based GPU workloads, with respect to one of the three given metrics: minimum of energy (E), Energy-Delay product (EDP) and Energy-Delay sum (EDS). The tool gathers power measurements from NVIDIA Management Library (NVML). Measuring the application progress at runtime is based on CUDA Profiling Tools Interface (CUPTI) kernel-counting. We have evaluated the DEPO tool on the NVIDIA RTX A4500 and A100 GPUs with machine learning workloads. Depending on the application (training of neural networks: Resnet152, Densenet161, VGG- 19 or a GEMM benchmark) for the E target metric, we were able to obtain energy savings exceeding 22% for both NVIDIA A100 and RTX A4500 GPUs while the performance drop has never been higher than 20%. Using one of the bi-objective EDP or EDS metrics allowed finding configurations resulting in 15% or 18% of energy saved with only 8% of performance loss. For most of the experiments the percentage-wise performance penalty is lower than the energy savings. This demonstrates its potential for energy consumption reduction in HPC systems with GPU accelerators.