Publications Repository - Gdańsk University of Technology

Page settings

polski
Publications Repository
Gdańsk University of Technology

Show publications from the year

Publications from the year 2024

Show all
  • Wavelet transform analysis reveals differences between patients with impaired LVEF and healthy individuals
    • Marcin Gruszecki
    • Damian Kaufmann
    • Michał Świątczak
    • Krzysztof Młodziński
    • J Neary
    • Jyotpal Singh
    • Jacek Rumiński
    • Ludmiła Danilowicz-szymanowicz
    2024 Full text Kardiologia Polska

    Heart failure (HF) is a global pandemic. It af- fects 64 million people worldwide, with stead- ily increasing incidence, morbidity, mortality, and economic burden [1]. Forecasts indicate continued rising prevalence, especially among the elderly and in low-to-middle socio-de- mographic index regions [2]. Left ventricular ejection fraction (LVEF) significantly impacts HF treatment and prognosis [3]. The sequence of physiological changes related to reduced LVEF remains uncertain, and only limited re- search has explored these mechanisms. This study employed wavelet transformation (WT) to investigate oscillatory interactions, exploring aging and decreased LVEF effects on cardiovascular dynamics. We analyzed central (electrocardiogram [ECG]) and pe- ripheral (blood pressure [BP]) measurements, hypothesizing modified wavelet quantities in HF patients compared to healthy individuals.

  • Weakly Hydrated Solute of Mixed Hydrophobic–Hydrophilic Nature
    • Aneta Panuszko
    • Maciej Śmiechowski
    • Maciej Pieloszczyk
    • Adrian Malinowski
    • Janusz Stangret
    2024 JOURNAL OF PHYSICAL CHEMISTRY B

    Infrared (IR) spectroscopy is a commonly used and invaluable tool in studies of solvation phenomena in aqueous solutions. Concurrently, density functional theory calculations and ab initio molecular dynamics simulations deliver the solvation shell picture at the molecular detail level. The mentioned techniques allowed us to gain insights into the structure and energy of the hydrogen bonding network of water molecules around methylsulfonylmethane (MSM). In the hydration sphere of MSM, there are two types of populations of water molecules: a significant share of water molecules weakly bonded to the sulfone group and a smaller share of water molecules strongly bonded to each other around the methyl groups of MSM. The very weak hydrogen bond of water molecules with the hydrophilic group causes the extended network of water hydrogen bonds to be not "anchored" on the sulfone group, and consequently, the MSM hydration shell is labile.

  • Wet H2S corrosion and degradation of pipeline in amine regeneration system
    • Juliusz Orlikowski
    • Maciej Kalinowski
    • Igor Lasota
    • Piotr Maruszewski
    • Michał Szociński
    • Kazimierz Darowicki
    2024 MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION

    The paper presents the results of NDT examinations, metallographic tests and risk assessment of degradation related to corrosion of amine regeneration unit in a desulphurisation system. Intensive corrosion resulting from acid gases environment upon water condensation causes perforation of the pipeline. Detailed analysis reveals cracking related to the mechanism of wet H2S. Hydrogen penetration, resulting from the wet H2S process, causes a decrease in mechanical properties of steel and an increase in hydrogen content inside steel. Corrosion results mostly from high stream velocity, the presence of acid gases (with high ammonia content), the presence of amine and low stream temperature.

  • What drives sustainable investing? Adoption determinants of sustainable investing exchange-traded funds in Europe
    • Adam Marszk
    • Ewa Lechman
    2024 Structural Change and Economic Dynamics

    Despite the growing interest in various topics related to sustainable (ESG) investing, some issues remain understudied, such as the determinants of their utilization at the macro level. This paper contributes to the state of knowledge two-directionally. First, it shows the development of sustainable investing exchange-traded funds (ETFs) in European countries. Second, it traces the significant determinants of adopting sustainable investing/ESG ETFs in Europe. More specifically, we aim to determine which financial, technological, social or institutional factors have the most significant impact on the growth of levels and over-time dynamics of the sustainable investing ETFs. The empirical sample covers five European economies: France, Germany, Italy, Switzerland, and the United Kingdom and the period of the analysis is 2006-2020. Adopting panel regression analysis, we investigate twenty different variables that potentially impact the development of sustainable investing ETFs across examined countries. Our results confirm the positive effects of the development of insurance companies and pension funds for the assets of the ESG ETFs. Also, factors such as stock markets development, ICT adoption, financial access and literacy, and the prevalence of tertiary-level education demonstrate a positive impact on ESG ETFs. The role of the financial performance and tax levels resulted in being neutral, thus indicating the lesser importance of the financial motives in relation to the other factors. The results were mixed in the case of the mutual funds and institutional variables.

  • What is the future of digital education in the higher education sector? An overview of trends with example applications at Gdańsk Tech, Poland
    • Alina Guzik
    • Michał Tomczak
    • Małgorzata Gawrycka
    2024 Full text Global Journal of Engineering Education

    Universities worldwide recognise the need to adapt to changes in society, the economy and the way young people prefer to learn. Additionally, the impetus to improve the digital approach in higher education intensifies as educational institutions have to remain competitive with commercial providers of education. Following the latest technological trends and implementing strategies to develop new digital solutions helps to improve the teaching process and the quality of academic teaching. The purpose of this article is to identify, analyse and discuss digital education trends and development directions targeted at the higher education sector. The authors provide a comprehensive overview of the current situation and illustrate practical implementations through examples from Gdańsk University of Technology (Gdańsk Tech), Poland. These include e-learning, micro-credentials, extended reality (XR) technologies, gamification, digital textbooks and generative artificial intelligence (AI). Possible new directions of on-line digital education in the higher education sector development, as well as the benefits and associated risks, are also identified and discussed.

  • What makes them dream big? Determinants of business growth aspirations among Polish students
    • Jakub Golik
    2024 Entrepreneurial Business and Economics Review

    The objective of the article is to explore the concept of business growth aspirations and identify its determinants at an early stage of the entrepreneurial process. In this exploratory study, I focused on the underexplored approach to entrepreneurial process i.e. to study the growth aspirations and its determinants alongside entrepreneurial intentions. Studying growth aspirations and their determinants provides valuable insights into how these aspirations form. This contributes to the literature and future empirical studies on the entrepreneurial process. The results show that entrepreneurial self-efficacy and entrepreneurial intention proved to be statistically insignificant. Eventually, I found six of the variables to influence the declared growth aspirations of respondents in a statistically significant way, namely: gender, family business background, entrepreneurial role model, declared resistance to stress, and perception of higher income and prestige as the most attractive features of entrepreneurship. Moreover, I identified a gender gap in growth aspirations. Finally, I verified five out of eight proposed research hypotheses and discussed the conclusions. The most important finding shows the presence of a gender gap in growth aspirations as early as at the time of studies. Therefore, it is advised that policymakers focus on this gap while designing entrepreneurship courses and take it into account. Secondly, it is important to accurately measure stress resistance among students, to show it as a potential advantage, and to teach safe coping strategies. Furthermore, it is recommended to promote the high social status of entrepreneurs, both in the financial (potentially higher income) and non-financial sense (prestige and satisfaction) while at the same time consciously educating about potential dangers. The study makes an original contribution to the literature on growth aspirations by answering the call to further explore their potential antecedents and is one of the first to do so at the earliest stage of the entrepreneurial process. It is achieved by studying determinants pertaining to sociocultural and individual dimensions which – according to some studies – require further investigation. Moreover, it is done in an unexplored context of students in a developing country in Europe. Finally, the article recognises the ambiguity in defining growth aspirations and suggests a clear distinction to be included in the literature and future research.

  • When Does Automation in Government Thrive or Flounder?
    • Elsa Estevez
    • Tomasz Janowski
    • David Benjamin Roseth
    2024

    Government organizations worldwide are harvesting the transformative potential of digital technologies to automate interactions with citizens, businesses, and each other. Automation can bring benefits, such as an increase the efficiency of government operations, quality of government decisions, and convenience of government-citizen interactions. It can also produce adverse outcomes, such as compromising social value for economic gains, misjudging citizen circumstances, and having to compensate for the effects of algorithmic errors. This publication delves into the implications of automation and how to implement initiatives that increase its benefits and manage its risks. Specific questions include: (i) how to identify areas of public policy and public services that are most apt for automation; (ii) what questions, regarding potential benefits and costs, should governments ask before embarking on a process of automation; (iii) how governments should monitor the benefits and costs in the process of automation and establish whether automation has had the desired impact; and (iv) how to organize and manage automation efforts. The authors explore these issues through 12 case studies from 8 countries (Argentina, Chile, France, Norway, Paraguay, Singapore, Spain, Sweden), the European Union, and 7 government sectors (administration, border control, finance, justice, procurement, registry, and welfare). Each case study identifies the problem automation was designed to resolve or service it was designed to deliver; potential benefits and costs of automation that were relevant in each context; and examples of how automation was implemented to reduce costs and monitored to ensure high impact without unintended negative consequences. The cases guide the formulation of a taxonomy of benefits and risks of government automation initiatives and the four broad factors that government organizations should consider when aiming to realize the benefits and manage the risks of such initiatives: institutional readiness, human capacity, process innovation, and whole-of-government approach. It also presents strategies for implementing the factors and discusses how they help produce public value.

  • Why Are Left-Handed G-Quadruplexes Scarce?
    • Michał Jurkowski
    • Mateusz Kogut
    • Subrahmanyam Sappati
    • Jacek Czub
    2024 Full text Journal of Physical Chemistry Letters

    G-quadruplexes (G4s) are nucleic acid structures crucial for the regulation of gene expression and genome maintenance. While they hold promise as nanodevice components, achieving desired G4 folds requires understanding the interplay between stability and structural properties, like helicity. Although right-handed G4 structures dominate the experimental data, the molecular basis for this preference over left-handed helicity is unclear. To address this, we employ all-atom molecular dynamics simulations and quantum chemical methods. Our results reveal that right-handed G4s exhibit greater thermodynamic and kinetic stability as a result of favorable sugar–phosphate backbone conformations in guanine tracts. Moreover, while hydrogen-bonding patterns influence helicity-specific G4 loop conformations, they minimally affect stability differences. We also elucidate the strong correlation between helicity and the strand progression direction, essential for G4 structures. These findings deepen our understanding of G4s, providing molecular-level insights into their structural and energetic preferences, which could inform the design of novel nanodevices.

  • Why do Open Government Data initiatives fail in developing countries? A root cause analysis of the most prevalent barriers and problems
    • Charalampos Harris Alexopoulos
    • Stuti Saxena
    • Marijn Janssen
    • Nina Rizun
    • Martin Lnenicka
    • Ricardo Matheus
    2024 Full text Electronic Journal of Information Systems in Developing Countries

    Open government data (OGD) include the provision of government data, which have so far been reserved for the provision of public utilities and services, wherein different stakeholders may create value out of the same source. Recently, OGD initiatives around the world have dampened or were found to be inadequate for one or other reasons. The present study seeks to underline the root causes behind these inadequate or stalled initiatives with a specific focus on the developing countries. This article undertakes a literature review of the most significant studies in this area, followed by a root cause analysis wherein the database across Scopus and Web of Science has been explored with the set inclusion and exclusion criteria being set in line with the research focusing on the hinderances and bottlenecks behind the failure of OGD initiatives (n 15), thus not only summarizing what has been revealed in previous studies but also identifying these “root-cause” relationships, which are responsible for the stalled OGD projects. A deep understanding of the literature on OGD shows that research of OGD barriers repeat each other. The results show that the main root causes include politico-administrative, social, technological, legal and organizational (inter- and intra) dimensions including aspects like state of the economy, infrastructural issues, the tendency to copy the OGD initiative without need to institutionalize the same, and so forth. Whereas a number of studies are available covering the barriers in the roll-out and implementation of OGD initiatives, the root causes behind the existence of these barriers have not been identified so far-the present study seeks to plug this gap. Besides being a contribution to the extant OGD literature in general, the study seeks to leave academic and practical implications for furthering up deliberations and discussions on the OGD themes with specific impetus upon the cause analysis of the failure in OGD initiatives and the manner in which the same may be corrected or preempted

  • Wideband High-Gain Low-Profile Series-Fed Antenna Integrated with Optimized Metamaterials for 5G millimeter Wave Applications
    • Bashar Esmail
    • Sławomir Kozieł
    • Anna Pietrenko-Dąbrowska
    • Dustin Isleifson
    2024 Full text Scientific Reports

    This paper presents a series-fed four-dipole antenna with a broad bandwidth, high gain, and compact size for 5G millimeter wave (mm-wave) applications. The single dipole antenna provides a maximum gain of 6.2 dBi within its operational bandwidth, which ranges from 25.2 to 32.8 GHz. The proposed approach to enhance both gain and bandwidth involves a series-fed antenna design. It comprises four dipoles with varying lengths, and a truncated ground plane. These dipoles are connected in series on both sides, running in parallel through a microstrip line. The proposed design significantly enhances the bandwidth, which extends from 26.5 to 40 GHz. This frequency range effectively covers the 5G bands of 28 and 38 GHz. The expedited trust-region (TR) gradient-based search algorithm is utilized to optimize the dimensions of the antenna components, resulting in a maximum gain of 11.2 dBi at 38 GHz. To further enhance the gain, modified H-shaped metamaterial (MTM)-based unit cells are integrated into the antenna substrate. The TR algorithm is employed once more to optimize the MTM dimensions, yielding a maximum gain of 15.1 dBi at 38 GHz. The developed system is experimentally validated, showing excellent agreement between the simulated and measured data.

  • Window frame integrable air recuperation minichannel/minigap heat exchanger
    • Paweł Dąbrowski
    • Rafał Andrzejczyk
    • Maciej Wacławik
    • Dariusz Mikielewicz
    2024 APPLIED THERMAL ENGINEERING

    This article describes an evaluation of mini heat exchangers operation as a decentralized mechanical ventilation system with recuperative heat recovery that can be integrated into the window frame. The relatively small yet efficient air recuperation system allows for retrofitting existing buildings by reducing the overall energy consumption and thus the CO2 emissions. The proposed design, unlike existing systems, is easy to scale up to various room sizes and is a promising solution for buildings where a centralized recuperation system cannot be implemented or interfering with the building’s facade is not allowed. The experimental research was carried out enabling to collect temperature, pressure drop, and volumetric flow rate measurements in a recuperation system with various minigeometries, namely minichannels with a hydraulic diameter of 3.00 mm, minigaps with a hydraulic diameter of 5.82 mm, and minigaps with a hydraulic diameter of 1.98 mm. The system was tested for a room air temperature of 22°C and three values of outside air temperatures, namely 5°C, 10°C, and 15°C. The volumetric flow rate for a single heat exchanger ranged from 4.1 m3/h to 20.4 m3/h. The results showed that higher temperature rise of supplied air and higher energy efficiency of the heat recovery can be achieved for smaller airflows and higher differences between outside and room temperatures. For an exemplary 34 m2 office room, the 0.8-fold air exchange rate can be provided and 1 667.1 kWh of annual energy savings can be achieved, corresponding to 50.3% of total energy required for heating the air. Heat exchangers equipped with 3.00 mm minichannels recover a similar amount of heat as the ones equipped with 5.82 mm minigaps, even though the hydraulic diameter of the minichannel is almost 2 times smaller. Meanwhile, a 5.82 mm minigap reduces the pressure drop by 76% compared to a 3.00 mm minichannel.

  • Wireless Charging Station Design for Electric Scooters: Case Study Analysis
    • Viktor Shevchenko
    • Oleksandr Husev
    • Dmitri Vinnikov
    • Ryszard Strzelecki
    • Bohdan Pakhaliuk
    2024 Full text ENERGIES

    This study proposes an example of a wireless charging station design for a small-scale vehicle available on the market. The article analyzes basic transmitter inverter topologies and their compensation methods in terms of flexibility of control, tolerance to uncertainty in positioning, and the possibility of decreasing the integration price. Our comprehensive analysis focuses on the battery voltage range, energy capacity, cost, and travel distance. We evaluate the constraints of efficiency, transmitted power, amount of used material, and size of the energy delivery system based on our design example. The aim is to increase the penetration of wireless technology in terms of convenience and integration capabilities.

  • Wirtualny pokój zagadek z zakresu matematyki
    • Radosław Baziak
    • Tomasz Daruk
    • Karol Żyra
    • Dorota Żarek
    • Jacek Lebiedź
    2024 Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej

    W artykule przedstawiono realizację pokoju z zagadkami matematycznymi opartego na rzeczywistości wirtualnej. Celem było stworzenie wciągającej gry z zakresu matematyki, w którą aktywnie angażują się studenci. Zespół badawczy zbudował aplikację do wykorzystania w Laboratorium Zanurzonej Wizualizacji Przestrzennej na Politechnice Gdańskiej. Gra składa się z czterech pokojów: pokoju wprowadzającego i trzech pokojów tematycznych. Łącznie w pokojach znajduje się 13 zagadek wymagających matematycznego myślenia. W celu oceny walorów edukacyjnych narzędzia, przygotowano ankiety i przeprowadzono eksperyment ze studentami pierwszego i trzeciego roku studiów. W artykule autorzy omówili zastosowanie rzeczywistości wirtualnej i koncepcji pokoju zagadek (ang. escape room) w celu stworzenia innowacyjnego narzędzia angażującego studentów w proces nauki matematyki w interaktywnej, stymulującej wizualnie scenografii.

  • Właściwości i potencjalne zastosowania azobenzokoron: hydroksyazobenzokorony
    • Paulina Szulc
    2024 Full text

    W rozprawie doktorskiej przedstawiono właściwości oraz metody syntezy azobenzokoron oraz hydroksyazobenzokoron. Opisano również zastosowanie związków makrocyklicznych jako chromojonoforów w czujnikach optycznych. W ramach pracy zbadano wpływ pH, rozpuszczalników oraz obecności jonów na równowagę tautomeryczną wybranych hydroksyazobenzokoron. Zbadano również równowagę kompleksowania jonów metali przez te związki oraz sprawdzono ich użyteczność jako materiał sensorowy. Przeprowadzone badania pozwoliły stwierdzić, że 19-członowa para-hydroksyazobenzokorona z dwoma podstawnikami fenylowymi kompleksuje m.in. jony glinu. Badania nad optodami na bazie porowatego szkła modyfikowanego polistyrenem z zastosowaniem tego związku jako chromojonoforu potwierdziły ich czułość na obecność tych jonów w roztworze wodnym. Po raz pierwszy scharakteryzowano także właściwości fluorescencyjne para hydroksyazobenzokoron. Wyznaczono wartości wydajności kwantowych oraz wartości stałej Sterna Volmera dla szeregu tych związków oraz określono zależność między strukturą a właściwościami fluorescencyjnymi. Opisano również nową metodę otrzymywania azobenzokoron z wykorzystaniem tlenku manganu(IV) jako utleniacza. Określono najbardziej optymalne warunku tego typu reakcji i otrzymano na tej drodze nowy związek: 19-członową azobenzokoronę z dwoma podstawnikami tert-oktylowymi.

  • Wpływ dawkowania pasty ściernej na intensywność docierania próbek płaskich
    • Adam Barylski
    • Patrycja Janczurewicz
    2024 Inżynieria Materiałowa

    Przedstawiono wyniki badań intensywności docierania próbek płaskich ze stopu aluminium, brązu aluminiowego i żeliwa sferoidalnego na docierarce jednotarczowej. Analizowano wpływ okresowego dawkowania elektrokorundowej pasty ściernej na wydajność obróbki w funkcji czasu, w zależności od położenia próbek w separatorach oraz liczby próbek docieranych jednocześnie i wywieranego nacisku jednostkowego.

  • Wpływ parametrów strugi paliwa wtryskiwanego do cylindra silnika okrętowego na początkową fazę rozpylania
    • Joanna Grochowalska
    2024 Full text

    Przedmiotem rozprawy jest analiza procesu wtrysku oleju napędowego do cylindra silnika okrętowego z zapłonem samoczynnym i bezpośrednim wtryskiem paliwa. Analiza tego zagadnienia została przeprowadzona w aspekcie wpływu makro parametrów strugi na początkową fazę rozpylania oleju napędowego. Celem niniejszej pracy jest określenie wpływu współczynnika L/D (długość otworu/średnica) otworu wylotowego wtryskiwacza na zmianę charakterystyki zasięgu strugi oraz kąta stożka strugi w czasie w początkowej fazie rozpylania. W tym celu przeprowadzono badania eksperymentalne, podczas których olej napędowy wtryskiwano do komory o stałej objętości pod różnym ciśnieniem. Metodę optyczną techniką Mie scattering wykorzystano do wizualizacji propagacji wtryskiwanego paliwa. Wyniki badań pokazały, że L/D otworu wylotowego, ciśnienie wtryskiwanego paliwa i przeciwciśnienie w komorze wpływają na makro parametry strugi w początkowej fazie rozpylania. Na podstawie wyników badań eksperymentalnych zostały zbudowane modele matematyczne pozwalające na obliczenie makro parametrów strugi rozpylanego oleju napędowego zmiennych w czasie w początkowej fazie rozpylania. Zbudowane modele poddano ocenie oraz weryfikacji oryginalnymi wynikami badań eksperymentalnych.

  • Wpływ popiołu lotnego na wybrane cechy mechaniczne gruntów organicznych
    • Witold Tisler
    • Dominik Maciejewski
    • Paweł Markowski
    • Mateusz Michalski
    • Marta Moroz
    2024 Builder

    Wzmacnianie gruntów polega na poprawie ich właściwości poprzez dodawanie innych materiałów lub spoiw. Obecnie stosuje się głównie wapno palone i cement, które są skuteczne, ale drogie i nieekologiczne. Produkcja cementu emituje znaczne ilości CO2, dlatego poszukuje się alternatywy, którą może być popiół lotny. W niniejszej pracy do badań wykorzystano popiół lotny klasy F (wg ASTM) i sprawdzono czy mimo mniejszej zawartości tlenku wapnia jest w stanie być alternatywą dla cementu czy wapna. Przeprowadzono serię badań polegających na wymieszaniu gruntu organicznego (namuł) z cementem oraz popiołem, a następnie zbadano wytrzymałość jednoosiową po 7 oraz 28 dniach. Uzyskane wyniki pokazują, że popiół może być alternatywą dla cementu. Kluczowy jest jednak okres dojrzewania oraz powstanie reakcji pucolanowych, których efektem jest wzrost wytrzymałości gruntu.

  • WPŁYW SKŁADU ANODY NA WYDAJNOŚĆ I STABILNOŚĆ TLENKOWYCH OGNIW PALIWOWYCH NIO+YSZ/YSZ/LACOFEO3-Δ
    • Aleksander Mroziński
    • Krzysztof Szostak
    • Jan Kulawik
    • Sebastian Molin
    • Dagmara Uhl
    • Piotr Jasiński
    • Beata Synkiewicz-musialska
    2024 Full text Elektronika : konstrukcje, technologie, zastosowania

    Badano wpływ proporcji składników anody na mikrostrukturę, widma impedancyjne i charakterystyki prądowo napięciowe testowych ogniw paliwowych z elektrolitem stałym na bazie tlenku cyrkonu stabilizowanego tlenkiem itru (YSZ), anodą NiO+YSZ i katodą LaCoFeO3-δ. Pomiary przeprowadzono dla różnej zawartości pary wodnej, ciśnienia parcjalnego wodoru, a także po starzeniu pod obciążeniem 300 mA/cm2. Najlepszą wydajność i stabilność uzyskano dla ogniw ze zwiększoną ilością grafitu w wyjściowym składzie materiału anodowego.

  • Wpływ stosowanych praktyk rolniczych na dopływ wód podziemnych oraz azotanów do Zatoki Puckiej
    • Dawid Potrykus
    2024 Full text Przegląd Geologiczny

    Eutrophication of marine basins associated with submarine groundwater discharge is currently one of the most important challenges in modern coastal hydrogeology, and is classified as a serious global environmental problem. A particular source of groundwater pollution is agricultural activity, which is commonly carried out in the coastal zone. Research was conducted on a representative part of the Bay of Puck watershed, dominated by agricultural land use. The geological setting of the study area is heterogeneous, which has a significant influence on groundwater flow and occurrence in the multi-aquifer hydrosystem, draining into Puck Bay. The impact of agricultural practices on groundwater and nitrate discharge to the Puck Bay was determined, by an integrated modeling approach, developed using combination of the SWAT, MODFLOW-NWT and MT3DMS codes. Spatial and seasonal variations of the N-NO3 load leached from the soil profile and the infiltration of precipitation are convergent with observed trends in the discharge of groundwater and N-NO3 loads into Puck Bay. The simulations show that 1,355.13 m3/h of groundwater and 1.87 kg/h (16.4 t/year) of N-NO3 load are discharged into Puck Bay from the aquifers analyzed, the majority of which comes from an upper aquifer. The distribution of the values as determined was found to be influenced by agricultural practices, resulting from changes in crop structure, fertilizer management, cultivation methods and grazing.

  • Wpływ widma promieniowania optycznego i położenia oprawy oświetleniowej wykorzystującej źródła elektroluminescencyjne na efektywność i minimalizację zużycia energii elektrycznej w farmie wertykalnej
    • Mateusz Feldzensztajn
    2024 Full text

    Rozprawa poświęcona jest optymalizacji modułów oświetlenia upraw roślinnych. W rozprawie wzięto pod uwagę zarówno wpływ widma światła modułów oświetlenia na własności użytkowe roślin, jak również aspektów energetycznych (oszczędność energii elektrycznej) oraz ogólnej sprawności modułów oświetlenia. W rozprawie udowodniono, że zindywidualizowany dobór widma promieniowania optycznego oprawy oświetleniowej stosowanej do uprawy roślin pozwala na poprawę własności użytecznych i wizualnych zbiorów wybranych gatunków roślin. Wśród tych właściwości można wyróżnić wzrost masy, lepsze wybarwienie, zwiększenie zawartości chlorofilu, zwiększenie ilości antocyjanów, poprawa ogólnej kondycji roślin. Wykazano również, że optymalizacja konstrukcji oraz odpowiedni dobór diod LED i sposobu montażu oprawy oświetleniowej pozwala na oszczędności energii elektrycznej oraz redukcji kosztów w oświetlaniu upraw roślin. W ramach pracy opracowano trzy stanowiska doświadczalne wyposażone w moduły oświetleniowe oraz przeprowadzono uprawy doświadczalne w formie farmy wertykalnej. Podsumowanie pracy zawiera wnioski ogólne, oryginalne osiągnięcia autora oraz prezentuje kierunki rozwoju prowadzonych badań.