@inproceedings{40283, author = {{Seifert, Andreas and Watson, Christina}}, booktitle = {{DGPs-Tagung „View on of Science“}}, location = {{Hildesheim}}, title = {{{Qualitätssicherung im bildungswissenschaftlichen Studium – methodologische Überlegungen.}}}, year = {{2022}}, } @article{32392, author = {{Duffe, Tobias and Kullmer, Gunter and Tews, Karina and Aubel, Tobias and Meschut, Gerson}}, journal = {{Theoretical and Applied Fracture Mechanics}}, title = {{{Global energy release rate of small penny-shaped cracks in hyperelastic materials under general stress conditions}}}, doi = {{10.1016/j.tafmec.2022.103461}}, year = {{2022}}, } @article{34133, abstract = {{In diesem Beitrag wird die ‚What Works‘-Debatte in der Sozialen Arbeit um die zentrale Frage nach Wirkfaktoren erweitert. Der empirische Nachweis von Wirkfaktoren in sozialarbeiterischen Interventionen ist bis heute ein Desiderat. Vor dem Hintergrund der Realist Evaluation werden in diesem Beitrag relevante Wirkfaktoren (Kontexte und Mechanismen) herausgearbeitet. Datengrundlage stellt eine Onlinebefragung von 200 fallführenden Fachpersonen in vier sozialarbeiterischen Handlungsfeldern in der deutschsprachigen Schweiz dar (Arbeitsintegration, Bewährungshilfe, Schuldnerberatung, Sozialhilfe). Die Ergebnisse verweisen auf signifi kante Wirkfaktoren von erfolgreichen Interventionen, u.a. Arbeitsstile der Fachpersonen und Verhaltensmerkmale der Klient(inn)en und können in einem allgemeinen Wirkungsmodell mit handlungsfeldübergreifenden Outcomes verdichtet werden. Diese Erkenntnisse leisten einen Beitrag zur Professionalisierung der Sozialen Arbeit sowie zur Konstruktion von Wirkungsmodellen und sollen zukünftige weitere Forschungsvorhaben in diese Richtung anregen.}}, author = {{Schneijderberg, Christian and Götze, Nicolai and Steinhardt, Isabel and Schindler, Janosch}}, issn = {{1619-5515}}, journal = {{Zeitschrift für Evaluation}}, keywords = {{Soziologie des Wertens und Bewertens, Peer Review, Akkreditierung, Hochschule}}, number = {{02}}, pages = {{217--244}}, publisher = {{Waxmann}}, title = {{{(Be)Werten im organisationsabhängigen Interaktionssystem: das Beispiel Peer Review in Akkreditierungsverfahren von Hochschulen und Studiengängen}}}, doi = {{10.31244/zfe.2022.02.03}}, volume = {{21}}, year = {{2022}}, } @article{35707, abstract = {{The proton conductivity of two coordination networks, [Mg(H2O)2(H3L)]·H2O and [Pb2(HL)]·H2O (H5L = (H2O3PCH2)2-NCH2-C6H4-SO3H), is investigated by AC impedance spectroscopy. Both materials contain the same phosphonato-sulfonate linker molecule, but have clearly different crystal structures, which has a strong effect on proton conductivity. In the Mg-based coordination network, dangling sulfonate groups are part of an extended hydrogen bonding network, facilitating a “proton hopping” with low activation energy; the material shows a moderate proton conductivity. In the Pb-based metal-organic framework, in contrast, no extended hydrogen bonding occurs, as the sulfonate groups coordinate to Pb2+, without forming hydrogen bonds; the proton conductivity is much lower in this material.}}, author = {{Javed, Ali and Steinke, Felix and Wöhlbrandt, Stephan and Bunzen, Hana and Stock, Norbert and Tiemann, Michael}}, issn = {{2190-4286}}, journal = {{Beilstein Journal of Nanotechnology}}, keywords = {{Electrical and Electronic Engineering, General Physics and Astronomy, General Materials Science}}, pages = {{437--443}}, publisher = {{Beilstein Institut}}, title = {{{The role of sulfonate groups and hydrogen bonding in the proton conductivity of two coordination networks}}}, doi = {{10.3762/bjnano.13.36}}, volume = {{13}}, year = {{2022}}, } @article{33691, abstract = {{Near ambient pressure XPS in nitrogen atmosphere was utilized to investigate gas-solid interactions within porous SiO2 films ranging from 30 to 75 nm thickness. The films were differentiated in terms of porosity and roughness. The XPS N1s core levels of the N2 gas in presence of the SiO2 samples showed variations in width, binding energy and line shape. The width correlated with the surface charge induced in the dielectric films upon X-ray irradiation. The observed different binding energies observed for the N1s peak can only partly be associated with intrinsic work function differences between the samples, opening the possibility that the effect of physisorption at room temperature could be detected by a shift in the measured binding energy. However, the signals also show an increasing asymmetry with rising surface charge. This might be associated with the formation of vertical electrical gradients within the dielectric porous thin films, which complicates the assignment of binding energy positions to specific surface-related effects. With the support of Monte Carlo and first principles density functional theory calculations, the observed shifts were discussed in terms of the possible formation of transitory dipoles upon N2 physisorption within the porous SiO2 films.}}, author = {{de los Arcos, Teresa and Weinberger, Christian and Zysk, Frederik and Raj Damerla, Varun and Kollmann, Sabrina and Vieth, Pascal and Tiemann, Michael and Kühne, Thomas and Grundmeier, Guido}}, issn = {{0169-4332}}, journal = {{Applied Surface Science}}, keywords = {{Surfaces, Coatings and Films, Condensed Matter Physics, Surfaces and Interfaces, General Physics and Astronomy, General Chemistry}}, publisher = {{Elsevier BV}}, title = {{{Challenges in the interpretation of gas core levels for the determination of gas-solid interactions within dielectric porous films by ambient pressure XPS}}}, doi = {{10.1016/j.apsusc.2022.154525}}, volume = {{604}}, year = {{2022}}, } @article{33685, abstract = {{In the spatial confinement of cylindrical mesopores with diameters of a few nanometers, water molecules experience restrictions in hydrogen bonding. This leads to a different behavior regarding the molecular orientational freedom (‘structure of water') compared to the bulk liquid state. In addition to the pore size, the behavior is also strongly affected by the strength of the pore wall-to-water interactions, that is, the pore wall polarity. In this work, this is studied both experimentally and theoretically. The surface polarity of mesoporous silica (SiO2) is modified by functionalization with trimethylsilyl moieties, resulting in a change from a hydrophilic (pristine) to a hydrophobic pore wall. The mesopore surface is characterized by N2 and H2O sorption experiments. Those results are combined with IR spectroscopy to investigate pore wall-to-water interactions leading to different structures of water in the mesopore. Furthermore, the water's structure is studied theoretically to gain deeper insight into the interfacial interactions. For this purpose, the structure of water is analyzed by pairing densities, coordination, and angular distributions with a novel adaptation of surface-specific sum-frequency generation calculation for pore environments.}}, author = {{Weinberger, Christian and Zysk, Frederik and Hartmann, Marc and Kaliannan, Naveen and Keil, Waldemar and Kühne, Thomas and Tiemann, Michael}}, issn = {{2196-7350}}, journal = {{Advanced Materials Interfaces}}, keywords = {{Mechanical Engineering, Mechanics of Materials}}, number = {{20}}, publisher = {{Wiley}}, title = {{{The Structure of Water in Silica Mesopores – Influence of the Pore Wall Polarity}}}, doi = {{10.1002/admi.202200245}}, volume = {{9}}, year = {{2022}}, } @article{29376, abstract = {{The electrochemical properties of carbonaceous materials produced by hydrothermal carbonization, referred to as hydrochar, can be substantially improved by post-carbonization via pyrolysis. Although these materials have been widely studied for a variety of applications, the mechanisms underlying the pyrolysis are yet poorly understood. This study provides a comprehensive temperature-resolved characterization of the chemical composition, morphology and crystallinity of sucrose-derived hydrochar during pyrolysis. Thermogravimetric analysis, differential scanning calorimetry, and elemental analysis have shown that the dry hydrochar loses about 41% of its dry mass due to the exothermic disintegration of oxygen-containing groups until the carbonization is completed at about 850 °C with a total carbon yield of 93%. The carbonization and aromatization of the initially furanic and keto-aliphatic structure were analyzed by 13C solid-state nuclear magnetic resonance spectroscopy, X-ray photoelectron spectroscopy, and Fourier transform infrared spectroscopy. The transition from an amorphous to a nanocrystalline graphitic structure was analyzed using X-ray diffraction and Raman spectroscopy. The pore formation mechanism was examined by helium ion microscopy, transmission electron microscopy, and nitrogen adsorption measurements. The results indicate the formation of oxygen-rich nanoclusters up to 700 °C, which decompose up to 750 °C leaving behind equally sized pores, resulting in a surface area of up to 480 m2/g.}}, author = {{Wortmann, Martin and Keil, Waldemar and Brockhagen, Bennet and Biedinger, Jan and Westphal, Michael and Weinberger, Christian and Diestelhorst, Elise and Hachmann, Wiebke and Zhao, Yanjing and Tiemann, Michael and Reiss, Günter and Hüsgen, Bruno and Schmidt, Claudia and Sattler, Klaus and Frese, Natalie}}, issn = {{0165-2370}}, journal = {{Journal of Analytical and Applied Pyrolysis}}, keywords = {{Analytical Chemistry, Fuel Technology}}, publisher = {{Elsevier BV}}, title = {{{Pyrolysis of sucrose-derived hydrochar}}}, doi = {{10.1016/j.jaap.2021.105404}}, volume = {{161}}, year = {{2022}}, } @article{28254, abstract = {{With the rapid advances of functional dielectric metasurfaces and their integration on on-chip nanophotonic devices, the necessity of metasurfaces working in different environments, especially in biological applications, arose. However, the metasurfaces’ performance is tied to the unit cell’s efficiency and ultimately the surrounding environment it was designed for, thus reducing its applicability if exposed to altering refractive index media. Here, we report a method to increase a metasurface’s versatility by covering the high-index metasurface with a low index porous SiO2 film, protecting the metasurface from environmental changes while keeping the working efficiency unchanged. We show, that a covered metasurface retains its functionality even when exposed to fluidic environments.}}, author = {{Geromel, René and Weinberger, Christian and Brormann, Katja and Tiemann, Michael and Zentgraf, Thomas}}, issn = {{2159-3930}}, journal = {{Optical Materials Express}}, number = {{1}}, pages = {{13--21}}, publisher = {{Optica}}, title = {{{Porous SiO2 coated dielectric metasurface with consistent performance independent of environmental conditions}}}, doi = {{10.1364/ome.444264}}, volume = {{12}}, year = {{2022}}, } @article{35181, abstract = {{Medienwissenschaftliche Forschung zu tagesaktuellen Themen ist oft damit konfrontiert, große Mengen an antisemitischem, rassistischem, misogynem, verschwörungstheoretischem Material sichten und analysieren zu müssen, dessen Verletzungspotential auch die jeweiligen Forscher_innen negativ affiziert. Der Beitrag fragt nach möglichen Bewältigungsstrategien, mit denen sich zu verletzendem Material forschen lässt, und die eine wirkungsvolle Kritik desselben ermöglichen, ohne als Forscher_in in die vom Material ausgehenden negativen Affekte und Epistemologien verwickelt zu werden.}}, author = {{Shnayien, Mary}}, journal = {{Zeitschrift für Medienwissenschaft}}, number = {{1}}, pages = {{54–65}}, title = {{{Sichere Räume, reparative Kritik. Überlegungen zum Arbeiten mit verletzendem Material}}}, doi = {{10.25969/mediarep/18126}}, volume = {{14}}, year = {{2022}}, } @article{36995, abstract = {{Der vorliegende Beitrag befasst sich mit der Berufswahl in der ehemaligen DDR. Hier wurde von einer "gelenkten Berufswahl" gesprochen. Dabei galten alle Berufe als gleichwertig. "Sozialistische Berufswahl" wurde als pädagogisches Programm und als freie Berufswahl betrachtet. Dies gilt es genauer zu erörtern. Grundlage sind Beiträge, die in der Berufsbildung zwischen 1950 und 1979 erschienen sind.}}, author = {{Heisler, Dietmar}}, journal = {{Berufsbildung. Zeitschrift für Theorie-Praxis-Dialog}}, keywords = {{Berufswahl, DDR}}, publisher = {{wbv, Eusl}}, title = {{{Sozialistische Berufswahl und Nachwuchslenkung in der DDR}}}, doi = {{10.3278/BB2201W}}, volume = {{192}}, year = {{2022}}, } @article{33724, author = {{Vieth, Pascal and Borgert, Thomas and Homberg, Werner and Grundmeier, Guido}}, issn = {{1438-1656}}, journal = {{Advanced Engineering Materials}}, keywords = {{Condensed Matter Physics, General Materials Science}}, publisher = {{Wiley}}, title = {{{Assessment of mechanical and optical properties of Al 6060 alloy particles by removal of contaminants}}}, doi = {{10.1002/adem.202201081}}, year = {{2022}}, } @inproceedings{34096, author = {{Gräßler, Iris and Roesmann, Daniel and Hillebrand, Stefan and Pottebaum, Jens}}, booktitle = {{Procedia CIRP ICME}}, issn = {{2212-8271}}, keywords = {{General Medicine}}, location = {{Gulf of Naples}}, pages = {{489--494}}, publisher = {{Elsevier BV}}, title = {{{Information Model for Hybrid Prototyping in Design Reviews of Assembly Stations}}}, doi = {{10.1016/j.procir.2022.09.054}}, volume = {{112}}, year = {{2022}}, } @article{34228, author = {{Mügge, Nils and Kronberg, Alexander and Glushenkov, Maxim and Inguva, Venkatesh and Kenig, Eugeny Y.}}, isbn = {{978-88-95608-95-2}}, issn = {{2283-9216}}, journal = {{Chemical Engineering Transactions}}, location = {{Mailand, Italien}}, pages = {{175--180}}, title = {{{A Thermal Model for Recuperative Heat Engines Operating with Dense Working Fluids}}}, doi = {{10.3303/CET2296030}}, volume = {{96}}, year = {{2022}}, } @inproceedings{33485, author = {{Dechert, Christopher and Kenig, Eugeny}}, booktitle = {{Proceedings of the 12th international conference Distillation & Absorption 2022}}, location = {{Toulouse, France}}, title = {{{CFD-Based Investigation of the Packing Microstructure Influence on Droplet Behavior and Film Flow}}}, year = {{2022}}, } @inproceedings{31223, author = {{Mügge, Nils and Kronberg, Alexander and Glushenkov, Maxim and Kenig, Eugeny}}, booktitle = {{Heat Powered Cycles Conference 2022}}, location = {{Bilbao, Spain}}, title = {{{On Heat Regeneration Limitations in Heat Engines With Dense Working Fluids}}}, year = {{2022}}, } @article{34216, abstract = {{Mechanical joining technologies are increasingly used in multi-material lightweight constructions and offer opportunities to create versatile joining processes due to their low heat input, robustness to metallurgical incompatibilities and various process variants. They can be categorised into technologies which require an auxiliary joining element, or do not require an auxiliary joining element. A typical example for a mechanical joining process with auxiliary joining element is self-piercing riveting. A wide range of processes exist which are not requiring an auxiliary joining element. This allows both point-shaped (e.g., by clinching) and line-shaped (e.g., friction stir welding) joints to be produced. In order to achieve versatile processes, challenges exist in particular in the creation of intervention possibilities in the process and the understanding and handling of materials that are difficult to join, such as fiber reinforced plastics (FRP) or high-strength metals. In addition, predictive capability is required, which in particular requires accurate process simulation. Finally, the processes must be measured non-destructively in order to generate control variables in the process or to investigate the cause-effect relationship. This paper covers the state of the art in scientific research concerning mechanical joining and discusses future challenges on the way to versatile mechanical joining processes.}}, author = {{Meschut, Gerson and Merklein, M. and Brosius, A. and Drummer, D. and Fratini, L. and Füssel, U. and Gude, M. and Homberg, Werner and Martins, P.A.F. and Bobbert, Mathias and Lechner, M. and Kupfer, R. and Gröger, B. and Han, Daxin and Kalich, J. and Kappe, Fabian and Kleffel, T. and Köhler, D. and Kuball, C.-M. and Popp, J. and Römisch, D. and Troschitz, J. and Wischer, Christian and Wituschek, S. and Wolf, M.}}, issn = {{2666-3309}}, journal = {{Journal of Advanced Joining Processes}}, keywords = {{Mechanical Engineering, Mechanics of Materials, Engineering (miscellaneous), Chemical Engineering (miscellaneous)}}, publisher = {{Elsevier BV}}, title = {{{Review on mechanical joining by plastic deformation}}}, doi = {{10.1016/j.jajp.2022.100113}}, volume = {{5}}, year = {{2022}}, } @article{43433, abstract = {{Ziel dieser Studie ist es den digitalen moodlegestützten asynchronen Sprachkurs Fachspezifisches Chinesisch für das „Maschinenbau in China Programm“ (mb-cn) der Fakultät für Maschinenbau der Universität Paderborn zu evaluieren, um Handlungsempfehlungen für zukünftig ähnlich aufgebaute Projekte zu entwickeln. Dazu wurden im Sommersemester 2021 sechs leitfadengestützte Interviews geführt. Die Interviews wurden anschließend mithilfe von deduktiv ermittelten Kategorien, die sich aus dem Technology Acceptance Model 2 (TAM2) nach Venkatesh und Davis (2000) ergaben, nach Mayring (2015) analysiert, um abschließend die Forschungsfrage zu beantworten: „Wie bewerten mb-cn Ingenieurstudierende die wahrgenommene Nützlichkeit der digitalen Sprachlernangebote des Kurses Fachspezifisches Chinesisch?“.}}, author = {{Hambach, Dennis}}, journal = {{ die hochschullehre. Interdisziplinäre Zeitschrift für Hochschule und Lehre}}, keywords = {{Technology Acceptance Model, Fachspezifische Chinesischsprachkurse, digitale Lehre, Moodle, Evaluation}}, number = {{8}}, pages = {{1--15}}, publisher = {{wbv Publikation}}, title = {{{Evaluation eines digitalen Fachspezifischen Chinesischsprachkurses für Studierende des Ingenieurwesens}}}, doi = {{10.3278/HSL2249W}}, year = {{2022}}, } @article{34243, abstract = {{ In view of economic and ecological trends, the concepts for lightweight construction in transport systems are becoming increasingly important. These are frequently applied in the form of multi-material systems, which are characterized by the selective use of materials and geometries. One major challenge in the manufacturing of multi-material systems is the joining of the individual components to form a complete system. Mechanical joining processes such as semi-tubular self-piercing riveting are frequently used for this application but reach their limits concerning the number of combinations of geometry and material. In order to react to the requirements and to increase the versatility of semi-tubular self-pierce riveting, a process combination consisting of a tumbling process and a self-pierce riveting process has been presented previously. This process combination is used in this work to investigate the versatility and to identify the influencing parameters on it. For this purpose, experiments are conducted to identify process-side influence possibilities. The tests are performed with a dual-phase steel aluminum alloy to represent the varying mechanical characteristics of multi-material systems. Furthermore, the initial sheet thicknesses of the joining partners are varied in several steps. In addition to the geometric joint formation used to describe the undercut, the rivet head end position and the residual sheet thickness, the joining process, is also analyzed during the investigations. Further, the innovative joining process is evaluated by comparing it with a conventional self-piercing riveting process. The knowledge obtained represents a basis for the identification and evaluation of the versatility of the process combination. }}, author = {{Wituschek, Simon and Kappe, Fabian and Meschut, Gerson and Lechner, Michael}}, issn = {{1464-4207}}, journal = {{Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications}}, keywords = {{Mechanical Engineering, General Materials Science}}, publisher = {{SAGE Publications}}, title = {{{Geometric and mechanical joint characterization of conventionally and tumbled self-piercing riveting joints}}}, doi = {{10.1177/14644207221135400}}, year = {{2022}}, } @article{29891, author = {{Gräßler, Iris and Preuß, Daniel and Pottebaum, Jens}}, issn = {{0720-8928}}, journal = {{Softwaretechnik-Trends}}, number = {{1}}, pages = {{15--16}}, publisher = {{Köllen Druck & Verlag GmbH}}, title = {{{Extrahierung von Anforderungen aus natürlich-sprachlichen Lastenheften: Was erschwert eine KI-basierte Extrahierung?}}}, volume = {{42}}, year = {{2022}}, } @article{29719, author = {{Borgert, Thomas and Homberg, Werner}}, issn = {{2352-4847}}, journal = {{Energy Reports}}, keywords = {{General Energy}}, pages = {{399--404}}, publisher = {{Elsevier BV}}, title = {{{Energy saving potentials of an efficient recycling process of different aluminum rejects}}}, doi = {{10.1016/j.egyr.2022.01.027}}, volume = {{8}}, year = {{2022}}, }