@inproceedings{19502,
author = {{Hetkämper, Tim and Krumme, Matthias and Dreiling, Dmitrij and Claes, Leander}},
booktitle = {{SEFI 48th Annual Conference Proceedings - Engaging Engineering Education}},
location = {{Enschede}},
pages = {{1309--1313}},
publisher = {{SEFI}},
title = {{{A modular, scalable open-hardware platform for project-based laboratory courses in electrical engineering studies}}},
year = {{2020}},
}
@article{37014,
abstract = {{Jugend wird als eine eigenständige Lebens- und Entwicklungsphase betrachtet. Für junge Geflüchtete stellt sie eine besondere Herausforderung dar. Für sie geht es nicht nur um die Bewältigung alterstypischer Entwicklungsaufgaben, sondern auch um eine gelingende Integration in die Aufnahmegesellschaft. Dazu gehören u. a. das Kennenlernen und die Aneignung von Sprache, Kultur und Werten, genauso die Erschließung von Alltagsräumen und Lebenswelten, z. B. von Freizeitmöglichkeiten, Bildung und von beruflichen Erfahrungsräumen. Die Frage zur gelingenden Integration und Gestaltung von Lebenswelten junger Geflüchteter wurde im Kontext der wissenschaftlichen Begleitung des Projekts „angekommen in Deiner Stadt“ der Walter Blüchert Stiftung genauer untersucht. Der Beitrag referiert u. a. die Ergebnisse einer in diesem Kontext durchgeführten egozentrierten Netzwerkanalyse. Die Ergebnisse zeigen, dass die Angebote den Rahmen für den Aufbau und die Erweiterung kommunikativer, sozialer Netzwerke darstellen und lebensweltliche Zugänge öffnen.}},
author = {{Heisler, Dietmar and Schemmer, Susanne}},
journal = {{BWP@ Berufs- und Wirtschaftspädagogik - online}},
keywords = {{Jugend, Lebensweltorientierung, soziale Netzwerke, geflüchtete Jugendliche, Lebenslagen junger Geflüchteter und Zugewanderter}},
pages = {{1--23}},
title = {{{Lebenswelten und soziale Netzwerke von jungen Geflüchteten und Zugewanderten am Übergang in Ausbildung und Beruf.}}},
year = {{2020}},
}
@article{19190,
abstract = {{Polarons in dielectric crystals play a crucial role for applications in integrated electronics and optoelectronics. In this work, we use density-functional theory and Green's function methods to explore the microscopic structure and spectroscopic signatures of electron polarons in lithium niobate (LiNbO3). Total-energy calculations and the comparison of calculated electron paramagnetic resonance data with available measurements reveal the formation of bound
polarons at Nb_Li antisite defects with a quasi-Jahn-Teller distorted, tilted configuration. The defect-formation energies further indicate that (bi)polarons may form not only at
Nb_Li antisites but also at structures where the antisite Nb atom moves into a neighboring empty oxygen octahedron. Based on these structure models, and on the calculated charge-transition levels and potential-energy barriers, we propose two mechanisms for the optical and thermal splitting of bipolarons, which provide a natural explanation for the reported two-path recombination of bipolarons. Optical-response calculations based on the Bethe-Salpeter equation, in combination with available experimental data and new measurements of the optical absorption spectrum, further corroborate the geometries proposed here for free and defect-bound (bi)polarons.}},
author = {{Schmidt, Falko and Kozub, Agnieszka L. and Biktagirov, Timur and Eigner, Christof and Silberhorn, Christine and Schindlmayr, Arno and Schmidt, Wolf Gero and Gerstmann, Uwe}},
issn = {{2643-1564}},
journal = {{Physical Review Research}},
number = {{4}},
publisher = {{American Physical Society}},
title = {{{Free and defect-bound (bi)polarons in LiNbO3: Atomic structure and spectroscopic signatures from ab initio calculations}}},
doi = {{10.1103/PhysRevResearch.2.043002}},
volume = {{2}},
year = {{2020}},
}
@article{25903,
abstract = {{Porous tin dioxide is an important low-cost semiconductor applied in electronics, gas sensors, and biosensors. Here, we present a versatile template-assisted synthesis of nanostructured tin dioxide thin films using cellulose nanocrystals (CNCs). We demonstrate that the structural features of CNC-templated tin dioxide films strongly depend on the precursor composition. The precursor properties were studied by using low-temperature nuclear magnetic resonance spectroscopy of tin tetrachloride in solution. We demonstrate that it is possible to optimize the precursor conditions to obtain homogeneous precursor mixtures and therefore highly porous thin films with pore dimensions in the range of 10–20 nm (ABET = 46–64 m2 g–1, measured on powder). Finally, by exploiting the high surface area of the material, we developed a resistive gas sensor based on CNC-templated tin dioxide. The sensor shows high sensitivity to carbon monoxide (CO) in ppm concentrations and low cross-sensitivity to humidity. Most importantly, the sensing kinetics are remarkably fast; both the response to the analyte gas and the signal decay after gas exposure occur within a few seconds, faster than in standard SnO2-based CO sensors. This is attributed to the high gas accessibility of the very thin porous film.}},
author = {{Ivanova, Alesja and Frka-Petesic, Bruno and Paul, Andrej and Wagner, Thorsten and Jumabekov, Askhat N. and Vilk, Yury and Weber, Johannes and Schmedt auf der Günne, Jörn and Vignolini, Silvia and Tiemann, Michael and Fattakhova-Rohlfing, Dina and Bein, Thomas}},
issn = {{1944-8244}},
journal = {{ACS Applied Materials & Interfaces}},
pages = {{12639--12647}},
title = {{{Cellulose Nanocrystal-Templated Tin Dioxide Thin Films for Gas Sensing}}},
doi = {{10.1021/acsami.9b11891}},
year = {{2020}},
}
@article{23854,
abstract = {{Micropatterned nanoporous aluminum oxide arrays are prepared on silicon wafer substrates by using photopolymerized poly(dimethylacrylamide) hydrogels as porogenic matrices. Hydrogel micropatterns are fabricated by spreading the prepolymer mixture on the substrate, followed by UV photopolymerization through a micropatterned mask. The hydrogel is covalently bonded to the substrate surface. Al2O3 is produced by swelling the hydrogel in a saturated aluminum nitrate solution and subsequent thermal conversion/calcination. As a result, micropatterned porous Al2O3 microdots with heights in µm range and large specific surface areas up to 274 m2 g−1 are obtained. Hence, the hydrogel fulfills a dual templating function, namely micropatterning and nanoporosity generation. The impact of varying the photopolymerization time on the properties of the products is studied. Samples are characterized by light and confocal laser scanning microscopy, scanning electron microscopy, energy-dispersive x-ray spectrometry, and Kr physisorption analysis.}},
author = {{Chen, Zimei and Kuckling, Dirk and Tiemann, Michael}},
issn = {{0957-4484}},
journal = {{Nanotechnology}},
publisher = {{IOP Publishing}},
title = {{{Nanoporous aluminum oxide micropatterns prepared by hydrogel templating}}},
doi = {{10.1088/1361-6528/aba710}},
volume = {{31}},
year = {{2020}},
}
@article{25898,
abstract = {{Metal oxide inverse opals are interesting for various applications. To achieve highly ordered inverse opal structures, one important issue during the colloidal crystal templating procedure is to form a stable precursor network before the template loses its structural integrity at high temperature. Using poly(methyl methacrylate), PMMA, colloidal crystal templates, it is essential to consider the physical and chemical changes of the precursors induced by the changes of PMMA during the thermal conversion. For a systematic investigation of this matter, we synthesized a variety of metal oxide inverse opals from the respective metal nitrates, including Cr2O3, Ga2O3, Fe2O3, In2O3, CuO, CeO2, and ZnO, to compare the effect of various modifications of precursors on the structural and optical properties. When the nitrate precursors have a lower thermal stability than the PMMA template, we have modified the metal nitrates by chelating or by polyacrylamide gelation to form more stable precursor networks.}},
author = {{Zhang, Xuyang and Weinberger, Christian and Amrehn, Sabrina and Wu, Xia and Tiemann, Michael and Wagner, Thorsten}},
issn = {{1434-1948}},
journal = {{European Journal of Inorganic Chemistry}},
pages = {{3402--3407}},
title = {{{Synthesis of Metal Oxide Inverse Opals from Metal Nitrates by PMMA Colloidal Crystal Templating}}},
doi = {{10.1002/ejic.202000517}},
year = {{2020}},
}
@article{25900,
abstract = {{The proton conduction properties of a phosphonato-sulfonate-based coordination polymer are studied by impedance spectroscopy using a single crystal specimen. Two distinct conduction mechanisms are identified. Water-mediated conductance along the crystal surface occurs by mass transport, as evidenced by a high activation energy (0.54 eV). In addition, intrinsic conduction by proton ′hopping′ through the interior of the crystal with a low activation energy (0.31 eV) is observed. This latter conduction is anisotropic with respect to the crystal structure and seems to occur through a channel along the c axis of the orthorhombic crystal. Proton conduction is assumed to be mediated by sulfonate groups and non-coordinating water molecules that are part of the crystal structure.}},
author = {{Javed, Ali and Wagner, Thorsten and Wöhlbrandt, Stephan and Stock, Norbert and Tiemann, Michael}},
issn = {{1439-4235}},
journal = {{ChemPhysChem}},
pages = {{605--609}},
title = {{{Proton Conduction in a Single Crystal of a Phosphonato‐Sulfonate‐Based Coordination Polymer: Mechanistic Insight}}},
doi = {{10.1002/cphc.202000102}},
year = {{2020}},
}
@article{44057,
abstract = {{Dieser Beitrag basiert auf den Ergebnissen eines im Jahr 2019 abgeschlossenen Promotionsvorhabens im Rahmen des interventiv angelegten, in Dortmund angesiedelten, Forschungsprojekts KidSmart – Medienkompetent zum Schulübergang zu den Mediensozialisationsbedingungen von deutschen, deutsch-türkischen und deutsch-anderen vier und fünf Jahre alten Mädchen und Jungen in den sozialen Feldern Familie und Kita. Im vorliegenden Beitrag wird auf die Befragung der ErzieherInnen fokussiert, die mittels halbstandardisierter Fragebögen durchgeführt wurde. Untersucht wurde, wie sich der sprachlich-kulturelle Hintergrund der Kinder für das Kommunikationsverhalten der ErzieherInnen mit den Kindern in pädagogischer Anschlusskommunikation und in Gesprächen mit den Eltern der Kinder auswirkt. Hier wurde auch eine intersektionale Perspektive eingenommen und parallel zur Herkunftskultur auch das biologische Geschlecht der Kinder in die Auswertung einbezogen. Es stellte sich heraus, dass die Kommunikation sowohl mit den Kindern als auch mit den Eltern in Abhängigkeit der Herkunftskultur der Kinder und auch ihres Geschlechtes erfolgt. Pädagogisch ist zu fragen, inwiefern es den pädagogischen Fachkräften gelingt, benachteiligende Ausgangslagen auch tatsächlich auszugleichen und Partizipation im Sinne von Inklusion zu ermöglichen. Ausgehend von diesen Ergebnissen wird in diesem Beitrag die Bedeutung und Relevanz der Überschneidungen und Interdependenzen von Ungleichheitsdimensionen für eine inklusionsorientierte Qualifikation pädagogischer Fachkräfte in institutionell-frühkindlichen Medienbildungskontexten diskutiert. Konkret richtet sich der Blick auf die sprachlich-kulturelle Ein- und Vielfalt in den frühkindlichen Einrichtungen sowie die Wahrnehmungen und Einschätzungen der pädagogischen Fachkräfte, die sie in Hinblick auf die Kooperationswilligkeit der Eltern, die Anschlusskommunikation mit den Kindern und schließlich die medialen Fähig- und Fertigkeiten der Kinder äußern.}},
author = {{Günesli, Habib}},
journal = {{QfI - Qualifizierung für Inklusion Online-Zeitschrift zur Forschung über Aus-, Fort- und Weiterbildung pädagogischer Fachkräfte}},
number = {{3}},
title = {{{Inklusion und Intersektionalität im Kontext frühkindlicher Medienbildungsforschung. Sprachkulturelle Homogenität und Diversität sowie ihre Auswirkungen auf pädagogische Kommunikation in der Frühen Bildung}}},
doi = {{https://doi.org/10.21248/qfi.41}},
volume = {{2}},
year = {{2020}},
}
@inbook{24479,
author = {{Moritzer, Elmar and Hüttner, M. and Henning, Bernd and Webersen, Manuel}},
booktitle = {{Advances in Polymer Processing 2020}},
title = {{{The Influence of Hydrothermal Aging on the Material Properties of Continuous Fiber-Reinforced Thermoplastics and its Non-Destructive Characterization}}},
doi = {{10.1007/978-3-662-60809-8_16}},
year = {{2020}},
}
@article{22266,
author = {{Grabo, Matti and Staggenborg, Christoph and Philippi, Kai Alexander and Kenig, Eugeny}},
issn = {{2296-598X}},
journal = {{Frontiers in Energy Research}},
title = {{{Modeling and Optimization of Rectangular Latent Heat Storage Elements in an Air-Guided Heat Storage System}}},
doi = {{10.3389/fenrg.2020.571787}},
volume = {{8}},
year = {{2020}},
}
@article{21514,
abstract = {{The influence of latent heat storage elements on the cooling performance and the temperature rise time of household refrigerating appliances is studied experimentally in the context of the “new global refriger- ator standard”IEC 62552:2015. In addition to the daily energy consumption, this international standard- ization introduced performance tests for cooling capacity and temperature rise time. While the cooling capacity has long been anchored in various test procedures of consumer organizations, the temperature rise time, which has only been tested on freezers so far, will be a decisive factor in the future. Moreover, the need for so-called "smart appliances" that may balance power consumption is increasing since such devices may compensate the volatility of renewable energies and thus stabilize the power grid. Against this background, eight commercial household refrigerators and refrigerator-freezers are equipped with polymer-bound phase change materials (PCM) and their performance is determined under the new stan- dard test conditions. The results show that the introduction of PCM increases the cooling capacity by up to 33 % and also increases the temperature rise time by up to 145 %, without affecting power consump- tion, as compared to the unmodified refrigeration appliances.}},
author = {{Sonnenrein, Gerrit and Baumhögger, Elmar and Elsner, Andreas and Morbach, A. and Neukötter, Moritz and Paul, Andreas and Vrabec, J.}},
issn = {{0140-7007}},
journal = {{International Journal of Refrigeration}},
pages = {{448--456}},
publisher = {{Elsevier}},
title = {{{Improving the performance of household refrigerating appliances through the integration of phase change materials in the context of the new global refrigerator standard IEC 62552:2015}}},
doi = {{10.1016/j.ijrefrig.2020.07.025}},
volume = {{119}},
year = {{2020}},
}
@article{21512,
abstract = {{Despite the omnipresence of household refrigeration appliances, there is still a lack of knowledge about their agerelated efficiency loss over time. Past studies provide basic evidence for increasing electricity consumption of cooling appliances with ageing but fail to investigate the associated technical wear. Concentrating on the degradation of the thermal insulation, we first determined the ageing process of sealed samples of polyurethane rigid foam by investigating changes in cell gas composition and thermal conductivity over time. Simultaneously, the main challenge was to develop an approach that investigates the age-related efficiency loss of the insulation without its destruction. This testing procedure is referred to as the Bonn method. The non-destructive Bonn method was applied to varying refrigerator models in a series of successive experiments to evaluate the insulation degradation over time. Subsequently, the physical relationship between the test value of the Bonn method and the heat transfer through the multi-layered compartment walls of domestic refrigeration appliances was established, ultimately characterising the degrading insulation in terms of increasing heat transfer. Our results give substantiated evidence that the efficiency loss of cooling appliances is greatly influenced by insulation degradation over time. The ageing of sealed samples of polyurethane rigid foam indicates a large initial increase of thermal conductivity by 15% within the first year, corresponding to a change in cell gas composition. These results are in line with those of the Bonn method, emphasising an increasing heat flow through the multi-layered compartment walls of domestic refrigerators with ageing. Therewith, the present study is of significance to a wide range of stakeholders and forms the basis for future research.}},
author = {{Hueppe, Christian and Geppert, Jasmin and Stamminger, Rainer and Wagner, Hendrik and Hoelscher, Heike and Vrabec, Jadran and Paul, Andreas and Elsner, Andreas and Becker, Wolfgang and Gries, Ulrich and Freiberger, Alfred}},
issn = {{1359-4311}},
journal = {{Applied Thermal Engineering}},
publisher = {{Elsevier}},
title = {{{Age-related efficiency loss of household refrigeration appliances: Development of an approach to measure the degradation of insulation properties}}},
doi = {{10.1016/j.applthermaleng.2020.115113}},
volume = {{173}},
year = {{2020}},
}
@article{15945,
author = {{Tinkloh, Steffen Rainer and Wu, Tao and Tröster, Thomas and Niendorf, Thomas}},
issn = {{0263-8223}},
journal = {{Composite Structures}},
title = {{{A micromechanical-based finite element simulation of process-induced residual stresses in metal-CFRP-hybrid structures}}},
doi = {{10.1016/j.compstruct.2020.111926}},
volume = {{238}},
year = {{2020}},
}
@article{16859,
author = {{Martin, Sven and Camberg, Alan A. and Tröster, Thomas}},
issn = {{2351-9789}},
journal = {{Procedia Manufacturing}},
location = {{virtually}},
pages = {{419--424}},
publisher = {{Elsevier}},
title = {{{Probability Distribution of Joint Point Loadings in Car Body Structures under Global Bending and Torsion}}},
doi = {{10.1016/j.promfg.2020.04.324}},
year = {{2020}},
}
@inproceedings{23409,
author = {{Bertling, René and Hack, Mathias and Ausner, Ilja and Kenig, Eugeny}},
title = {{{CFD Simulation of Film and Rivulet Flows on Microstructured Surfaces}}},
year = {{2020}},
}
@inproceedings{22965,
author = {{Rozo Vasquez, Julian and Arian, Bahman and Riepold, Markus and Homberg, Werner and Trächtler, Ansgar and Walther, Frank}},
booktitle = {{ 54. Metallographie-Tagung}},
pages = {{75--81}},
title = {{{Microstructural investigation on phase transformation during flow forming of the metastable austenite AISI 304 }}},
year = {{2020}},
}
@inbook{36726,
author = {{Spiegel, Anna}},
booktitle = {{Multiple Gender Cultures, Sociology and Plural Modernities. Re-reading Social Constructions of Gender across the Globe in a De-Colonial Perspective.}},
editor = {{Poferl, Angelika and Winkel, Heidemarie}},
pages = {{155--177}},
publisher = {{Routledge}},
title = {{{The Work of Entanglement. Translating Women's Rights in Malaysia}}},
year = {{2020}},
}
@article{24236,
abstract = {{In diesem Artikel werden das Scherzugverhalten und der morphologische Zustand von konturgeschweißtem Polypropylen (PP) mit einem Massenanteil von 0,2% Ruß untersucht. Dabei zeigen die Ergebnisse ...}},
author = {{Schöppner, Volker and Wübbeke, Andrea and Schriegel, Fabian and Paul, Andrej and Tiemann, Michael and Geißler, Bastian and Schmidt, Michael and Magnier, Arnaud and Niendorf, Thomas }},
journal = {{Joining Plastics}},
pages = {{30--35}},
title = {{{Selected Aspects for the Assessment of Laser Transmission Welding}}},
year = {{2020}},
}
@article{30713,
author = {{Rostek, Tim and Wiens, Eugen and Homberg, Werner}},
journal = {{Procedia Manufacturing}},
pages = {{395--399}},
publisher = {{ Elsevier Ltd}},
title = {{{Joining with Versatile Friction-Spun Joint Connectors}}},
doi = {{10.1016/j.promfg.2020.04.313}},
volume = {{47}},
year = {{2020}},
}
@article{41519,
abstract = {{AbstractDifferent studies have been demonstrated that the surface integrity of substrate bulk materials to be coated has a significant impact on the adhesion of thermally sprayed coatings. It is known that the surface integrity of parts processed by selective laser melting (SLM) differs from those obtained from bulk materials. Although 316L stainless steel is among the most investigated material for SLM, the adhesion of thermally sprayed coatings on 316L stainless steel substrates processed by SLM has not been studied yet. This study aims at evaluating the effect of various mechanical pre-treatments onto 316L stainless steel substrates processed by SLM and their effect on the adhesion of high velocity oxy-fuel (HVOF)-sprayed WC-Co coatings. To differentiate between topographical effects and residual stress-related phenomena, a stress-relief heat treatment of the SLM substrates served as a reference throughout the investigations. The differently pre-treated SLM substrates were investigated with regard to the surface roughness and residual stresses. For the HVOF-sprayed SLM composites, Vickers interfacial indentation tests were conducted to assess the resulting coating adhesion. The findings demonstrated that the HVOF-sprayed WC-Co coatings predominantly exhibit good adhesion to the SLM 316L substrates. However, it was found that the stress state in the SLM 316L substrate surface is more likely to affect the adhesion of the WC-Co coating, while the substrate surface roughness showed a marginal effect.}},
author = {{Tillmann, Wolfgang and Hagen, Leif and Schaak, Christoph and Liß, J. and Schaper, Mirko and Hoyer, Kay-Peter and Aydinöz, Mehmet Esat and Garthe, Kai-Uwe}},
issn = {{1059-9630}},
journal = {{Journal of Thermal Spray Technology}},
keywords = {{Materials Chemistry, Surfaces, Coatings and Films, Condensed Matter Physics}},
number = {{6}},
pages = {{1396--1409}},
publisher = {{Springer Science and Business Media LLC}},
title = {{{Adhesion of HVOF-Sprayed WC-Co Coatings on 316L Substrates Processed by SLM}}},
doi = {{10.1007/s11666-020-01081-y}},
volume = {{29}},
year = {{2020}},
}