Ostwestfalen-Lippe University of Applied Sciences and Arts
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Multispectral Characterization of Additively Manufactured and Dip-Coated Axicons
No full textThis article discusses the additive manufacturing and post-processing of axicons, and their performance evaluation using attenuation and near-field-measurements based fundamental techniques. The axicons are manufactured using the materials cyclic olefin copolymer (TOPAS) and polymethyl methacrylate (PMMA), for their respective use in terahertz and near-infrared applications. An emphasis is placed on the dip-coating-based post-processing. Interval dipping and intermittent hardening lead to excellent surface finish and transparency in case of additively-manufactured near-infrared axicons. The dip-coated samples exhibit surface roughness of sub 10 nm, and a uniformly distributed thin layer coating over the axicon surface. In addition to the improved surface finish and transparency, the coatings are also closely matched in refractive index to the axicon material. Such post-processed axicons pave the way for rapid-prototyping and production
Die Omnibus-Initiative des Europäischen Richtliniengebers – Ein Wendepunkt der unionsrechtlichen Regulierung der Nachhaltigkeitsberichterstattung
No full textDer Europäische Richtliniengeber hat weitreichende Vereinfachungen im Bereich der Nachhaltigkeitsberichterstattung beschlossen. Diese Vereinfachungen sind Ausdruck eines Strategiewechsels des Europäischen Richtliniengebers. Während in den 2010erund den frühen 2020er-Jahren eine Ausweitung der verbindlichen Nachhaltigkeitsberichterstattung im Vordergrund stand, findet nunmehr eine Deregulierung statt
Incorporating scheduling autonomy of workers into flexible job shop scheduling: Learning and balancing decentralized task sequencing decisions with overall scheduling performance
No full textIn manufacturing systems with a job shop organization, queues between workstations create an intermittent process flow, allowing workers to schedule tasks entering the queue based on their needs and preferences. The resulting scheduling autonomy of individual workers often leads to inefficiencies in the overall production process due to the loss of control. Companies are therefore increasingly using algorithmic scheduling systems to assign task sequences to workers, thereby drastically reducing their autonomy and negatively affecting their job performance and well-being. This paper extends the existing flexible job shop scheduling problem by sequencing preferences (FJSPSP) to incorporate a human-centered perspective by predicting workers’ task sequencing decisions using learning-to-rank (LTR) methods. By learning workers’ individual task sequencing preferences, it becomes possible to predict the processing sequence based on task characteristics. The scheduling algorithm for the FJSPSP presented in the paper incorporates workers’ learned sequencing preferences as constraints. Considering workers’ learned task sequencing decisions, the FJSPSP optimizes only task assignments to maintain workers’ autonomy over task sequences. The contributions of this paper are fourfold, namely, (1) presenting an approach to elicit sequencing decision datasets from workers, (2) demonstrating the successful prediction of humans’ and an actual worker’s task sequencing decisions with LTR, (3) formulating the FJSPSP variant that integrates workers’ sequencing preferences as constraints and proving its effectiveness in a simulation study, and (4) consolidating these steps into an explainable artificial intelligence (XAI)- and LTR-enabled sociotechnical system design framework. The paper closes with a discussion of the overall methodology and future research perspectives
Multispectral characterization of additively manufactured and dip-coated axicons
No full textThis article discusses the additive manufacturing and post-processing of axicons, and their performance evaluation using attenuation and near-field-measurements based fundamental techniques. The axicons are manufactured using the materials cyclic olefin copolymer (TOPAS) and polymethyl methacrylate (PMMA), for their respective use in terahertz and near-infrared applications. An emphasis is placed on the dip-coating-based post-processing. Interval dipping and intermittent hardening lead to excellent surface finish and transparency in case of additively-manufactured near-infrared axicons. The dip-coated samples exhibit surface roughness of sub 10nm, and a uniformly distributed thin layer coating over the axicon surface. In addition to the improved surface finish and transparency, the coatings are also closely matched in refractive index to the axicon material. Such post-processed axicons pave the way for rapid-prototyping and production
Lebensmittel-Mykologie : Verderbsprozesse - Fermentation - biologische Hintergründe
No full textPilze prägen die Lebensmittelindustrie: als wertvolle Helfer bei der Herstellung traditioneller und innovativer Produkte. Ebenso sind sie als Verursacher von Verderb und Mykotoxin-Bildung gefürchtet. Dieses Fachbuch bietet einen umfassenden Überblick über die Rolle von Schimmelpilzen und Hefen in allen Nahrungsmitteln
Elektrotechnik zum Selbststudium : Grundlagen und Vertiefung
No full textDas Lehr- und Arbeitsbuch entspricht der Einführungsvorlesung der Elektrotechnik an Hochschulen und ist explizit für das Selbststudium konzipiert.
Von den physikalischen Grundlagen, elektrotechnischen Grundbegriffen und elektromagnetischen Feldern bis hin zu Fourier-Reihen und transienten Vorgängen werden in 22 Kapiteln grundlegende und vertiefende Vorlesungsinhalte der Elektrotechnik wiedergegeben. Aufgaben, Lösungen und kleinere Zusammenfassungen am Ende jedes Kapitels unterstützen beim selbstständigen Lernen und Erarbeiten der Inhalte.
Das Buch führt als Selbststudium leicht lesbar durch die Basis der Elektrotechnik. Das Lernen mit diesem Arbeitsbuch ist in einem Bachelor-Fernstudiengang Elektrotechnik erprobt
Additively-Manufactured Terahertz Waveguides
No full textAdditive manufacturing (AM) paves the way for low-cost production of optical and terahertz (THz) components such as waveguides, fibers, and lenses [1]–[3]. This work addresses the fabrication and THz characterization of a 3D-printed waveguide composed of cyclic olefin copolymer (TOPAS). Such a waveguide is a convenient and inexpensive tool in the development of THz interconnects, and in applications such as biomedical sensing
Conceptual Framework for Designing Domain-Specific LLM-Based Information Systems
No full textRetrieval-augmented generation (RAG) based on large language models (LLMs) has established itself as a key technology for combining domain-specific information with generative language skills, thereby providing transparent, up-to-date information. Many firms are already piloting such LLM-based information systems, but report a high degree of complexity in planning and implementation. A generally accepted regulatory framework that consistently maps key decisions is not yet available to companies. This article therefore presents a multi-level system that organizes design decisions throughout the configuration process. This framework is intended to support users in the planning, realizing, evaluation, and further development of an LLM-based information system. To achieve this goal, a qualitative-empirical research design was chosen. First, publications from the period 2022 to 2025 were identified and selected using a systematic literature search in accordance with the PRISMA guideline. The selected publications were then evaluated using a qualitative content analysis. The result is a system that was reviewed, revised and finalized at an expert workshop