Theses (Faculty of Science and Technology)
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A DE Természettudományi és Technológiai Kar Tanácsának 2009. november 25.-i határozata alapján a jövőben elektronikus formában is elhelyezésre kerülnek a szakdolgozatok a Debreceni Egyetem Egyetemi és Nemzeti Könyvtár által működtetett egyetemi archívumban, a DEAba. A szakdolgozatok az archívumból kizárólag a Debreceni Egyetem IP-címeiről hozzáférhetőek, azokat nem lehet kinyomtatni, és azokból szövegrészeket nem lehet kiemelni.
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Tétel Korlátozottan hozzáférhető Potential inhibitory effects of microcystin-LR on cyst maturation of the model green alga Haematococcus lacustrisCorrales, Marycruz; Bácsi, István; DE--Természettudományi és Technológiai Kar--Biológiai és Ökológiai IntézetDespite the fact, that microcistyns belongs to the most often studied cyanobacterial metabolites, there are relatively little knowledge about their effects on the natural "neighborhood" of cyanobacteria: other algae. The lack of knowledge is especially true regarding those algae, which can be characterized serious life cycle changes due to certain environmental conditions. Among the freshwater green algae, H. lacustris is the best known cyst forming species, because this species has been considered as one of the most important natural sources of astaxanthin under stressful environmental conditions. Astaxanthin has a significant economic value within different industries, therefore there are a lot of studies focused on the optimization of astaxanthin production. Previous studies have shown that a lot of stressful conditions may increase the rate of astaxanthin production. Moreover, it was demonstrated that different cell types are formed during the life cycle of H. lacustris according to the surrounding conditions and growth stage. Because of these, H. lacustris is an excellent model organism for studying cyst formation under different environmental stress conditions. The main aim of this thesis work was to study the growth, life cycle and cysts formation of H. lacustris under the presence of a cyanotoxin, MC-LR, to evaluate physiological changes. The results showed that vegetative cell number was lower in MC-LR treated cultures, in contrast, cyst number changes suggest the induction of encystment, seemingly proving our hypothesis. Evaluating the results of cell type proportion changes, our hypothesis was only partially proved: Indeed, the proportion of flagellated vegetative cells decreased, as a result palmella cells appeared so cyst formation was induced. However, the maturation of palmella did not continue, i.e. the accumulation of red pigment did not differed from control and was significantly lower than in induced culture. This shows that H. lacustris cells tried to adapt according to the surrounding environment and cyst formation was induced as its defense mechanism to survive under extreme conditions. However, the maturation of the formed palmella cells (accumulation of red pigments) missed. These preliminary results suggest that MC-LR could have a long adverse effect on the diversity of algal communities, but there are necessary more detailed studies to analyze this phenomenon.Tétel Korlátozottan hozzáférhető Enhancing encapsulation efficiency and in vitro dissolution of sodium alginate based delivery system carrying fosfomycinCullhaj, Emanuela; Nemes, Daniel; DE--Természettudományi és Technológiai Kar--Kémiai IntézetThe current research examines the behavior of sodium alginate microbeads loaded with fosfomycin by manipulating several parameters, which are characterized for the goal of assessing bioavailability. A regulated encapsulation approach is utilised to enable further absorption tests in the gastric and intestinal fluids, as well as enhance the dissolution rate, hence improving the overall efficiency of the procedure. The present study investigates the behaviour of sodium alginate beads loaded with fosfomycin by encapsulation using a controlled polymerization approach. This is achieved by altering various parameters to optimise the encapsulation process. This study aims to optimise the operational parameters of encapsulation systems, such as the polymer concentration, polymer solubility in the solvent, and rate of solvent removal, to enhance their efficiency.Tétel Korlátozottan hozzáférhető Spatiotemporal analysis of fire foci and Land Use and Land Cover changes in the Caatinga biome of Rio Grande do Norte - Brazil via satellite data and GISda Silva Santos, Renata Sammara; Túri , Zoltán Krisztián; DE--Természettudományi és Technológiai Kar--Földtudományi IntézetEvents of fires might have many different origins and consequences. In Brazil, they can have a particular difficult level of monitoring considering the extensive area of the country and lack of publicly available data specially for remote regions. By the use of remotely sensed data from satellites as well as GIS tools, this study carried out fire foci and LULC spatiotemporal analysis from 2002 to 2020/2022, providing relevant information for the State of Rio Grande do Norte (RN) in Brazil. Within the state, an emphasis was given to the Caatinga biome which is currently at risk. The information obtained from this study could support decision making regarding monitoring and management of the affected areas and highlighted and corroborated to the threat Caatinga has been facing.Tétel Korlátozottan hozzáférhető Protection of a grid by using superconductorLakan, Jinan; Kosa, Janos; DE--Természettudományi és Technológiai Kar--Fizikai IntézetThis thesis first delves into the properties of superconductors. These properties such as zero resistance can be used to develop systems that protect power grids. Cables made of superconductors are used to create an sfcl system for grid protection. Finally, A design is proposed for the development of an sfcl grid protection systemTétel Korlátozottan hozzáférhető Design of a 16 MVA Distribution GridNkosi, Sabelo; Kosa, Janos; DE--Természettudományi és Technológiai Kar--Fizikai IntézetThis thesis thoroughly explores electrical networks, covering generation, transmission, and distribution. It examines both traditional and eco-friendly energy sources, emphasizing their impact on the power system. The transmission system's critical role is highlighted, considering power lines and substations, while special techniques analyze electricity movement. Addressing the delivery system, the study clarifies how lower-power electricity reaches homes, marking the endpoint of the power grid. Overall, it offers a simplified yet insightful perspective on the intricate dynamics of electricity systems in the context of increasing renewable energy integration.Tétel Korlátozottan hozzáférhető Superconducting Protection in an Electrical SystemKossybay , Alikhan; János, Kósa; DE--Természettudományi és Technológiai Kar--Fizikai IntézetSuperconductivity is a phenomenon observed in certain materials under extremely low temperatures, which provides very significant properties to be used in electrical systems. This thesis work scope is the overview that properties and research on best applications of it. The overview of the current situation of the power grid systems and revision of new technologies prospects the best application of superconductivity. For instance, protection in an electrical system through the implementation of superconducting fault current limiters and transmission of electricity through superconducting cables. The thesis project remains focused on protection, which is why the design of AC and DC SFCL protection will be presented.Tétel Korlátozottan hozzáférhető Development of Face Recognition Technology For Airport Security SystemSilavinia, Esraa; Misák, Sándor; DE--Természettudományi és Technológiai Kar--Fizikai IntézetThis project aims to implement a user-friendly, low cost, and high accuracy face recognition system used in airports for security purpose. This thesis presents the implementation and developments of face recognition technology, the system is deployed through a Django web server configured on Raspberry Pi 3B+ microcontroller. With an integration of OpenCV library and other supporting libraries using Python computer language, the face recognition algorithms were implemented. The web server provides multiple web pages and buttons for the interaction with system operation. An SQLite database was used to store the passenger’s information. A training of the system’s training set, and a face recognition with a responded message of granted access or denied access along with LED status indication was performed.Tétel Korlátozottan hozzáférhető Development of PLC-Based Automated Virtual Cooking MachineMd Nayeem, Hossain; Sandor, Misak; DE--Természettudományi és Technológiai Kar--Fizikai IntézetThis thesis presents a comprehensive study on the development and implementation of an automated cooking machine based on PLC, with the objective of enhancing cooking efficiency and convenience. In this book, the potential for automating various cooking tasks is identified, aiming to reduce human intervention and ensure consistent and precise results. Subsequently, the thesis delves into the design and development process of the PLC-based automated cooking machine. In order to validate the performance and functionality of the automated cooking machine, the program operation was tested using simulation and practically at the laboratory. Additionally, the machine's precise control over cooking parameters ensures consistent quality, making it a valuable tool in professional kitchens and food production environments.Tétel Korlátozottan hozzáférhető Microcontroller-based Public Transportation Dispatching/Scheduling and Monitoring SystemRiaz, Muhammad Umair; Sandor, Misak; DE--Természettudományi és Technológiai Kar--Fizikai IntézetI have created a Microcontroller based public transportation monitoring and dispatching system that has two benefits. One of them is that it provides the real time information of location of the bus, temperature inside the bus and the passenger occupancy in the bus, the other one is that it stores the data in database that later can be used for scheduling and further optimization of bus routes.Tétel Korlátozottan hozzáférhető Smart Home Implementation Using Internet of ThingsSakib Nipun, Sadman; Kornél Battistig, Gábor; DE--Természettudományi és Technológiai Kar--Fizikai IntézetSmart technology has been a focal point of technological advancements in recent years. This thesis work primarily focuses on the design and hardware development of a smart home system prototype by using IoT methodologies and Electronics. The goal of the thesis is to create a low-cost PCB prototype – the IoT Smart Home PCB – capable of performing multiple home automation tasks. The thesis also focuses on the necessary software implications that are integral for designing this smart home system. Future work and suggested improvements for the system are discussed as well at the end of this thesis work.Tétel Korlátozottan hozzáférhető Design and Simulation of DC-DC ConvertersUgoji, Rukevwe; Harasztosi, Lajos; DE--Természettudományi és Technológiai Kar--Fizikai IntézetThe thesis comprises of the different types of DC-DC Converters. Its explains their working principles. It also emphasises on the advantages and limitations of the converters. The emphasis was on boost Sepic Converter. Simulations for the converter were performed in different scenarios.Tétel Korlátozottan hozzáférhető Developing a LabVIEW and Arduino Based Signal Processing System For Demonstration PurposesAkinfisoye, Ireoluwatomiwa; Harasztosi, Lajos; DE--Természettudományi és Technológiai Kar--Fizikai IntézetThis study explores the creation of an Arduino-and LabVIEW-based signal processing system for a range of uses. The research tackles important issues in data collecting, sampling system design, and electronics realization. By overcoming gaps in the community’s support and documentation, the research highlights LabVIEW LINX’s flexibility and versatility. A practical and affordable solution is created by combining low-cost Arduino boards for data collection with LabVIEW’s GUI programming features. A thorough grasp is established by exploring the potential, constraints, and dynamic landscape of LabVIEW and Arduino in signal processing. This opens the door to creative ideas and applications across a range of industries.Tétel Korlátozottan hozzáférhető Design a Superconducting Fault Current Limiter (SFCL)Simiyu, Salma Wesioma; Kosa, Janos Arpad; DE--Természettudományi és Technológiai Kar--Fizikai IntézetThe thesis discusses design of a superconducting fault current limiter. It describes the device's role in mitigating fault currents, reviewing different types of SFCLs and their unique qualities, and how each one is preferred depending on the task, also describing the device designed. It analyses the choice of material for the SFCL . It takes into account the length of the superconducting wire in the SFCL and factors influencing this length. It emphasizes the benefits and drawbacks of the SFCL. The thesis also analyzes the challenges involved in the implementation of the SFCL and the solutions to these challenges.Tétel Korlátozottan hozzáférhető Transmission and distribution of power systemOmene, David Ijeoma; Kosa, Janos Arpad; DE--Természettudományi és Technológiai Kar--Fizikai IntézetIn this research I covered some fundamental challenges in our power system sector today. Also taking a deep dive into the history of electricity generation to shed light on how electricity generation and distribution has gone and some major players that helped shape this evolution. Transformers and their efficiency as well as the types and faults and categories were touched upon, I have designed a medium voltage grid in this thesis that is capable of operating a city, village and factory. The designed electric transformer represents a significant leap forward in the quest for sustainable and efficient energy transmission. I have also implemented various switch gears such as fuses, circuit breakers, disconnectors, and relays to provide protection for the grid. Air coil was also used to reduce resistance in the planned grid. I also used a spare transformer to work independently whenever the main distribution transformer has a fault or undergoes breakdown or used during power outages. All parameters were taken into consideration while the grid was being planned such as the appropriate distribution lines to be used, in the case of the village the distribution lines are placed in air.Tétel Korlátozottan hozzáférhető Design An Application by Using SuperconductorMadi, Nour; Kósa, János; DE--Természettudományi és Technológiai Kar--Fizikai IntézetThis thesis delves into the impact of Resistive Superconducting Fault Current Limiter (R-SFCL) devices on electrical grids. It offers a thorough analysis of the functioning, features, and usage of R-SFCL in contemporary power systems. The study explores the effects of R-SFCL on different facets of the electrical grid, encompassing fault current alleviation, voltage control, transient stability, and power quality. The thesis includes a design for a resistive superconducotr current limitter. The influence of R-SFCL on AC grid is discussed.Tétel Korlátozottan hozzáférhető Development of Smart Power Supply electronics for Battery ChargesMayilov, Ulvi; Harasztosi, Lajos; DE--Természettudományi és Technológiai Kar--Fizikai IntézetIn this thesis we made Smart Battery Charger which designed for optimize and protect rechargeable batteries. These charger typically analyze factors such as voltage, charge level to adjust charging currents and voltages, preventing overcharging or overheating. System capability is adapt charging rate, maximazing battery performance.Tétel Korlátozottan hozzáférhető 33 MVA DISTRIBUTION GRID FOR A NIGERIAN TOWNSHIP USING MEDIUM VOLTAGEMaduagwu, Osinaka; Kosa, Janos; DE--Természettudományi és Technológiai Kar--Fizikai IntézetThe power sector is the backbone of any thriving economy, providing the necessary energy for industrial, commercial, and domestic activities. In Nigeria, as in many developing nations, the power sector has been marred by persistent challenges, hindering the nation's economic growth and development. This dissertation seeks to delve into the intricate workings of the 33 MVA distribution grid in Nigeria, examining its role in the broader context of the nation's power sector, and proposing strategic interventions to address the prevailing issues. Nigeria, with its rapidly growing population and expanding economy, faces a continuous struggle to meet the escalating demand for electricity. The 33 MVA distribution grid plays a pivotal role in the final stage of the power supply chain, distributing electricity to end-users across various regions. However, despite the significance of this grid, there are systemic challenges that have hampered its effectiveness. In this report we are going to have an overview of how I conducted my thesis research report with the help of my supervisor Dr János Kosa. In my research report, we divided it into five main segments of which I wrote a detailed description of each segment to give an idea of what we are working with and how it all builds up together eventually. The following are the five main segments are listed below: 1. Show the Nigerian power grids. 2. Direction of development in Nigeria. 3. Design a medium voltage grid. 4. Calculation of the grid. 5. Applied switch gears in planned system.Tétel Korlátozottan hozzáférhető Developing a Microcontroller-based Fire, Gas and Smoke Detection Device and Alarming SystemSiddiquee, Mohammad Rakibul Islam Siddiquee; Harasztosi, Lajos; DE--Természettudományi és Technológiai Kar--Fizikai IntézetIn recent decades, advancements in digitization and automation have revolutionized safety measures in hazardous work settings. Utilizing sensors and intelligent devices, real-time data can be gathered even before a fire spreads, enhancing firefighting efforts through precise situational analysis and assistance in fire suppression, thereby minimizing danger and saving time in locating fires and people. This thesis introduces a design and development approach for a microcontroller-operated device capable of detecting fire, smoke, and gas leaks. The device's efficacy and functionalities were tested in a controlled environment to ensure its reliable performance.Tétel Korlátozottan hozzáférhető Preparation of Pyridine-contained Macrocycle Ligand with Hydroxamates SidearmsKongphaly, Douangdara; Csupász, Tibor; Gyula, Tircsó; DE--Természettudományi és Technológiai Kar--Kémiai IntézetThis thesis focuses on the synthesis of hydroxamate derivatives in the preparation of pyridine-containing macrocycle ligands. These ligands have potential applications as MRI contrast agents. The synthesis of the ligand involves several steps, including the synthesis of a hydroxamate derivative and the purification of the final product. These steps require careful optimization of reaction conditions and reagents to achieve high yields and purity. This research is expected to lead to the development of a new pyridine-containing macrocycle ligand that has potential applications as an MRI contrast agent.Tétel Korlátozottan hozzáférhető Mass Spectrometry Analysis of Biomolecules: Isoflavone and its DerivativesNana Bah, Philomina; Nagy, Lajos; DE--Természettudományi és Technológiai Kar--Kémiai IntézetThis experiment looked at the fragmentation of isoflavones and its derivatives using APCI-MS/MS. This yielded results such as the loss of common moieties CO, OH and methyl radical. The possible fragment ions detected on the spectra were also identified through a proposed fragmentation pathway. The collision energy (CE) at 50% survival yield was determined and the fragmentation stability of the analysed samples were also calculated based on CE at 50%. The technique used was valuable in identifying the possible product ions of the ionized samples and rank them based on their fragmentation stabilities.