Technische Hochschule Würzburg-Schweinfurt Publikationsserver OPUS
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Decarbonization of district heating: A systematic review of carbon footprint and key mitigation strategies
No full textMethodology for Designing Broadband DC Link Filters for Voltage Source Converters
No full textThis paper presents a new methodology for the design process of DC ripple filters for voltage source converters. It focuses on fast-switching, wide-bandgap-material-based converters. Therefore, a wide frequency range of up to 100 MHz is taken into consideration during the whole process. Different tools like analytic calculations, time-domain modelling, and the finite element method are used for different tasks in order to generate a realistic model in terms of filter effect and reliability. The models are validated by small-signal measurements using a vector network analyser as well as realistic high-power tests. The contribution of this paper is to provide a tool for DC link filter design to estimate the filter efficiency and the current stress on the filter elements with a special focus on WBG hardware
Analysis of Spectral Index Interrelationships for Vegetation Condition Assessment on the Example of Wetlands in Volyn Polissya, Ukraine
No full textThe Cheremskyi Nature Reserve, situated in the Volyn region of Ukraine, constitutes a pivotal element of the European ecological network, distinguished by its distinctive mosaic of peatlands, bogs, and floodplain forests. This study utilizes Sentinel-2 satellite imagery and the Google Earth Engine (GEE) to assess the spatiotemporal patterns of various vegetation indices (NDVI, EVI, SAVI, MSAVI, GNDVI, NDRE, NDWI) from 2017 to 2024. The study aims to select the most suitable combination of vegetation spectral indices for future research. The analysis reveals significant negative trends in NDVI, SAVI, MSAVI, GNDVI, and NDRE, indicating a decline in vegetation health, while NDWI shows a positive trend, suggesting an increased vegetation water content. Correlation analysis underscores robust interrelationships among the indices, with NDVI and SAVI identified as the most significant through random forest feature importance analysis. Principal component analysis (PCA) further elucidates the primary axes of variability, emphasizing the complex interplay between vegetation greenness and moisture content. The findings underscore the utility of multi-index analyses in enhancing predictive capabilities for ecosystem monitoring and support targeted conservation strategies for the sustainable management of the Cheremskyi Nature Reserve
Assistierter Suizid – die juristische Perspektive
No full textDer Beitrag befasst sich mit der Suizidhilfe aus der Perspektive des deutschen Rechts und legt Schwerpunkte im Strafrecht und im Verfassungsrecht, um davon ausgehend Möglichkeiten einer weitergehenden Regulierung zu diskutieren. Herausgearbeitet wird, dass die Beihilfe zum Suizid nur unter den Bedingungen der freiverantwortlichen Entscheidung zum Suizid und der Vornahme der letzten zum Tode führenden Handlungen durch den Suizidenten selbst straffrei ist, womit andere Unterstützungshandlungen bereits nach geltendem Recht strafbar sind. Wie unabhängig von einer gesetzlichen Regelung Freiverantwortlichkeit festgestellt sowie insbesondere die Aufklärung und Beratung über Alternativen vor dem Hintergrund unterschiedlicher Bedürfnisse von Menschen in unterschiedlichen Lebens- und Problemsituationen erfolgen könnten, stellt einen weiteren Baustein der Überlegungen dar. Insgesamt wird eine rechtliche Regelung kritisch gesehen. Vielmehr wird die Praxis aufgefordert, Handlungsempfehlungen zum Umgang mit Suizidwünschen fortlaufend zu entwickeln
Analysis of Electric-Field-Dependent Polarization of Triglyceride Ester Oil Molecules Using DFTB-MD Simulations
No full textGreening AI-enabled Systems with Software Engineering: A Research Agenda for Environmentally Sustainable AI Practices
No full textThe environmental impact of Artificial Intelligence (AI)-enabled systems is increasing rapidly, and software engineering plays a critical role in developing sustainable solutions. The ''Greening AI with Software Engineering'' workshop,1 funded by the Centre Europ´een de Calcul Atomique et Mol´eculaire (CECAM) and the Lorentz Center, provided an interdisciplinary forum for 29 participants, from practitioners to academics, to share knowledge, ideas, practices, and current results dedicated to advancing green software and AI research. The workshop was held February 3-7, 2025, in Lausanne, Switzerland. Through keynotes, flash talks, and collaborative discussions, participants identified and prioritized key challenges for the field. These included energy assessment and standardization, benchmarking practices, sustainability-aware architectures, runtime adaptation, empirical methodologies, and education. This report presents a research agenda emerging from the workshop, outlining open research directions and practical recommendations to guide the development of environmentally sustainable AI-enabled systems rooted in software engineering principles
Passive Radiative Cooling Materials with Special Focus on the Reduction of Urban Heat Island Effect: A Current Summarized Classification of Need, Approaches and Characterization Methods
No full textRapidly rising global temperatures and the intensification of the urban heat island (UHI) effect necessitate new, energy-efficient solutions to mitigate heat stress in cities. Passive radiative cooling (PRC) offers a highly promising, low-energy pathway to achieve sub-ambient temperatures by reflecting incoming solar radiation while emitting long-wave infrared radiation through the atmospheric infrared window. This review summarizes key aspects of PRC and its role in reducing UHI impacts. Furthermore the fundamental physics of heat transfer and radiative heat exchange, including the materials properties such as solar reflectance and thermal emissivity which are correlated with the figures of merit, temperature drop below ambient temperature and cooling power. A comprehensive classification of current PRC materials is presented based on both structural architectures and physical effects. Additionally an overview on measurement techniques are employed to determine the performance of PRC materials, focusing on the key performance indicators. For this purpose in-field as wells as laboratory measurement techniques are introduced and opportunities in standardizing testing protocols are highlighted. Finally, future research directions are outlined, focusing on novel material development, theoretical advancements, scalable fabrication processes, and integration strategies within urban infrastructures. These innovations are important for enhancing building energy efficiency, reducing urban heat stress, and promoting sustainable urban development in the face of climate change