@inproceedings{20681, abstract = {{The battle of developing hardware Trojans and corresponding countermeasures has taken adversaries towards ingenious ways of compromising hardware designs by circumventing even advanced testing and verification methods. Besides conventional methods of inserting Trojans into a design by a malicious entity, the design flow for field-programmable gate arrays (FPGAs) can also be surreptitiously compromised to assist the attacker to perform a successful malfunctioning or information leakage attack. The advanced stealthy malicious look-up-table (LUT) attack activates a Trojan only when generating the FPGA bitstream and can thus not be detected by register transfer and gate level testing and verification. However, also this attack was recently revealed by a bitstream-level proof-carrying hardware (PCH) approach. In this paper, we present a novel attack that leverages malicious routing of the inserted Trojan circuit to acquire a dormant state even in the generated and transmitted bitstream. The Trojan's payload is connected to primary inputs/outputs of the FPGA via a programmable interconnect point (PIP). The Trojan is detached from inputs/outputs during place-and-route and re-connected only when the FPGA is being programmed, thus activating the Trojan circuit without any need for a trigger logic. Since the Trojan is injected in a post-synthesis step and remains unconnected in the bitstream, the presented attack can currently neither be prevented by conventional testing and verification methods nor by recent bitstream-level verification techniques.}}, author = {{Ahmed, Qazi Arbab and Wiersema, Tobias and Platzner, Marco}}, booktitle = {{2021 Design, Automation & Test in Europe Conference & Exhibition (DATE)}}, location = {{Alpexpo | Grenoble, France}}, publisher = {{2021 Design, Automation and Test in Europe Conference (DATE)}}, title = {{{Malicious Routing: Circumventing Bitstream-level Verification for FPGAs}}}, doi = {{10.23919/DATE51398.2021.9474026}}, year = {{2021}}, } @misc{42989, author = {{Dewerth, Mats-Ole and Neukötter, Moritz}}, title = {{{Entwicklung eines Versuchsaufbaus zur rheo-optischen Untersuchung des Dehnverhaltens von Polymerschmelzen und -lösungen am Hochdruck-Kapillarrheometer (Studienarbeit)}}}, year = {{2021}}, } @misc{43004, author = {{Hütte, Marvin and Neukötter, Moritz}}, title = {{{Weiterentwicklung des Versuchsaufbaus zur Untersuchung von Polymerschmelzen und -lösungen am Hochdruck-Kapillarrheometer}}}, year = {{2021}}, } @article{23456, author = {{Mattiolo, Davide and Steffen, Eckhard}}, issn = {{0364-9024}}, journal = {{Journal of Graph Theory}}, keywords = {{factorization, perfect matchings, regular graphs, r-graphs}}, number = {{1}}, pages = {{107--116}}, title = {{{Highly edge‐connected regular graphs without large factorizable subgraphs}}}, doi = {{10.1002/jgt.22729}}, volume = {{99}}, year = {{2021}}, } @article{21827, author = {{Klopp, Antje and Steffen, Eckhard}}, issn = {{0911-0119}}, journal = {{Graphs and Combinatorics}}, pages = {{559--580}}, title = {{{Fractional Matchings, Component-Factors and Edge-Chromatic Critical Graphs}}}, doi = {{10.1007/s00373-020-02266-6}}, year = {{2021}}, } @article{13445, author = {{Steffen, Eckhard and Vogel, Alexander}}, journal = {{European J. Combinatorics}}, title = {{{Concepts of signed graph coloring}}}, volume = {{91}}, year = {{2021}}, } @inbook{37537, author = {{Dopheide, F. and Freitag, Christine and Koch, L. and Struchholz, C.}}, booktitle = {{Impulse zu Methoden in der deutschsprachigen Civic Engagement-Forschung}}, editor = {{Gerholz, Karl-Heinz}}, pages = {{15--32}}, title = {{{Gesellschaftliche Wirkprozesse des Civic Engagement qualitativ erforschen}}}, year = {{2021}}, } @article{37539, author = {{Freitag, Christine}}, journal = {{Katechetische Blätter}}, number = {{4}}, pages = {{255--258}}, publisher = {{https://www.katbl.de}}, title = {{{Denk-Wege zu einer religionssensiblen Schulkultur: erziehungswissenschaftliche Perspektiven}}}, year = {{2021}}, } @inbook{37533, author = {{Freitag, Christine}}, booktitle = {{Impulse zu Methoden in der deutschsprachigen Civic Engagement-Forschung}}, editor = {{Gerholz, Karl-Heinz}}, pages = {{15--32}}, title = {{{Gesellschaftlich Wirkprozesse des Civic Engagement qualitativ erforschen}}}, year = {{2021}}, } @misc{35839, abstract = {{Erklärvideos gewinnen auch im Kontext des Physikunterrichts verstärkt an Relevanz. Um zu evaluieren, welche Gestaltungsaspekte ein wirkungsvolles Erklärvideo ausmachen, ist es das Ziel der vorliegenden Masterarbeit herauszufinden, welchen Einfluss die kohärente Gestaltung eines Erklärvideos hat. Dazu wird die Forschungsfrage gestellt: „Welchen Einfluss hat die kohärente Gestaltung eines Erklärvideos auf den dadurch hervorgerufenen Lernzuwachs im Vergleich zu einem in der Hinsicht nicht optimierten Video?“ Um die Forschungsfrage zu beantworten, ist eine quantitative Studie im Prä- und Posttestdesign mit Schüler:innen der Jahrgangsstufe Q1 durchgeführt worden. Außerdem wurde in verschiedenen Kategorien nach einer Bewertung der Videos gefragt. Die Auswertung zeigt, dass durch das optimierte Video mit einem kleinen Effekt bessere Ergebnisse erzielt wurden, diese aber nicht signifikant und auch nicht für alle Aufgaben besser sind. Die Schüler:innen bewerteten das nicht optimierte Video in allen Kategorien besser als das optimierte Video. Auch dieses Ergebnis ist nicht signifikant.}}, author = {{Hörnlein, Madeleine}}, pages = {{105}}, title = {{{Untersuchung von Erklärvideos im Physikunterricht - Wirksamkeit von Kohärenz}}}, year = {{2021}}, } @article{44896, abstract = {{This study uniquely employs a fuzzy-set qualitative comparative analysis (fsQCA) technique to account for complex relationships in consumption. The fsQCA technique assumes that relationships are based on a set–subset relationship. This assumption is fundamental when decision-makers are affected by information asymmetry and are, thus, required to jointly evaluate the credibility and reliability of a range of external signals. This issue also affects consumers in markets for cultural goods, where the quality of products is not known with certainty in advance of the purchase decision. Our study uses fsQCA to establish the effect of different quality signals on consumption in the US market for video game software. Our results show that reviews from professional critics alongside brand extension and multi-platform release strategies act as signals of product quality and, therefore, lead to high sales performance.}}, author = {{Kaimann, Daniel and Cox, Joe}}, issn = {{2071-1050}}, journal = {{Sustainability}}, keywords = {{Management, Monitoring, Policy and Law, Renewable Energy, Sustainability and the Environment, Geography, Planning and Development}}, number = {{23}}, publisher = {{MDPI AG}}, title = {{{A Comparative Analysis of Consumption: Evidence from a Cultural Goods Market}}}, doi = {{10.3390/su132313275}}, volume = {{13}}, year = {{2021}}, } @article{21289, author = {{Kaimann, Daniel and Tanneberg, Ilka and Cox, Joe}}, issn = {{0143-6570}}, journal = {{Managerial and Decision Economics}}, number = {{1}}, pages = {{3--20}}, title = {{{“I will survive”: Online streaming and the chart survival of music tracks}}}, doi = {{10.1002/mde.3226}}, volume = {{42}}, year = {{2021}}, } @article{44899, abstract = {{AbstractChanges in winery ratings in leading wine guides, that is, improvements as well as deteriorations, are typically attributed to corresponding changes in the quality of the wines produced by the respective winery. What remains unexplored in this context is changes in editorship and/or changes in the composition of the wine tasting teams working for the respective guide. Using data from two particularly prestigious German wine guides (Gault Millau and Vinum), this paper shows that these latter changes have a rather small, yet statistically significant impact on changes in winery ratings. Thus, consumers are well-advised to consider these changes before making their purchasing decision. (JEL Classifications: L21, M30, Q13)}}, author = {{Frick, Bernd}}, issn = {{1931-4361}}, journal = {{Journal of Wine Economics}}, keywords = {{Horticulture, General Business, Management and Accounting, Food Science}}, number = {{4}}, pages = {{370--377}}, publisher = {{Cambridge University Press (CUP)}}, title = {{{The Legacy of Gurus: The Impact of Armin Diel and Joel Payne on Winery Ratings in Germany}}}, doi = {{10.1017/jwe.2020.36}}, volume = {{15}}, year = {{2021}}, } @article{45001, author = {{Roos, E. and Brehm, Martin}}, journal = {{Phys. Chem. Chem. Phys.}}, pages = {{1242--1253}}, title = {{{A Force Field for Bio-Polymers in Ionic Liquids (BILFF) – Part 1: [EMIm][OAc] / Water Mixtures}}}, doi = {{10.1039/D0CP04537C}}, volume = {{23}}, year = {{2021}}, } @article{45004, author = {{Brehm, Martin and Thomas, M.}}, journal = {{Molecules}}, pages = {{1875}}, title = {{{Optimized Atomic Partial Charges and Radii Defined by Radical Voronoi Tessellation of Bulk Phase Simulations}}}, doi = {{10.3390/molecules26071875}}, volume = {{26 (7)}}, year = {{2021}}, } @article{45005, author = {{Roy, S. and Brehm, Martin and Sharma, S. and Wu, F. and Maltsev, D. and Halstenberg, P. and Gallington, L. and Mahurin, S. and Dai, S. and Ivanov, A. and Margulis, C. and Bryantsev, V.}}, journal = {{J. Phys. Chem. B}}, pages = {{5971--5982}}, title = {{{Unraveling Local Structure of Molten Salts via X-Ray Scattering, Raman Spectroscopy, and ab initio Molecular Dynamics}}}, doi = {{10.1021/acs.jpcb.1c03786}}, volume = {{125 (22)}}, year = {{2021}}, } @article{45006, author = {{Triolo, A. and Pietro, M. E. Di and Mele, A. and Celso, F. Lo and Brehm, Martin and Lisio, V. Di and Martinelli, A. and Chater, P. and Russina, O.}}, journal = {{J. Chem. Phys.}}, pages = {{244501}}, title = {{{Liquid Structure and Dynamics in the Choline Acetate:Urea 1:2 Deep Eutectic Solvent}}}, doi = {{10.1063/5.0054048}}, volume = {{154}}, year = {{2021}}, } @article{45003, author = {{Codescu, M.-A. and Weiß, M. and Brehm, Martin and Kornilov, O. and Sebastiani, D. and Nibbering, E. T. J.}}, journal = {{J. Phys. Chem. A}}, pages = {{1845--1859}}, title = {{{Switching Between Proton Vacancy and Excess Proton Transfer Pathways in the Reaction Between 7-Hydroxyquinoline and Formate}}}, doi = {{10.1021/acs.jpca.0c10191}}, volume = {{125 (9)}}, year = {{2021}}, } @article{45000, author = {{Mukherjee, M. and Tripathi, D. and Brehm, Martin and Riplinger, C. and Dutta, A. K.}}, journal = {{J. Chem. Theory Comput.}}, pages = {{105--116}}, title = {{{Efficient EOM-CC-Based Protocol for the Calculation of Electron Affinity of Solvated Nucleobases: Uracil as a Case Study}}}, doi = {{10.1021/acs.jctc.0c00655}}, volume = {{17 (1)}}, year = {{2021}}, } @article{45002, author = {{Triolo, A. and Celso, F. Lo and Brehm, Martin and Lisio, V. Di and Russina, O.}}, journal = {{J. Mol. Liq.}}, pages = {{115750}}, title = {{{Liquid Structure of a Choline Chloride-Water Natural Deep Eutectic Solvent: A Molecular Dynamics Characterization}}}, doi = {{10.1016/j.molliq.2021.115750}}, volume = {{331}}, year = {{2021}}, } @inproceedings{44153, author = {{Knickenberg, Margarita and Zurbriggen, C.}}, title = {{{Qualität sozialer Interaktionen von Jugendlichen mit emotionalen Problemen oder Problemen im Umgang mit Peers im Unterricht – Eine Pilotstudie mit der Experience Sampling Method}}}, year = {{2021}}, } @inproceedings{44152, author = {{DeVries, J. M. and Knickenberg, Margarita and Trygger, M.}}, title = {{{Gender, special education needs, and inclusion: Evidence from the Perceptopions of Inclusion Questionnaire in Sweden}}}, year = {{2021}}, } @article{44151, author = {{DeVries, Jeffrey M. and Knickenberg, Margarita and Trygger, Maria}}, issn = {{0885-6257}}, journal = {{European Journal of Special Needs Education}}, keywords = {{Developmental and Educational Psychology, Health Professions (miscellaneous), Education}}, number = {{3}}, pages = {{511--525}}, publisher = {{Informa UK Limited}}, title = {{{Academic self-concept, perceptions of inclusion, special needs and gender: Evidence from inclusive classes in Sweden}}}, doi = {{10.1080/08856257.2021.1911523}}, volume = {{37}}, year = {{2021}}, } @article{45115, abstract = {{ Context Return to running (RTR) after anterior cruciate ligament reconstruction (ACLR) is a crucial milestone. However, how and when to start a running program are uncertain. Objective To explore the feasibility of a structured program to reintroduce running after ACLR and evaluate the predictive value of potential predictors of short-term success. Design Longitudinal cohort study. Setting Local research center and participants' homes. Patients or Other Participants Thirty-five participants were recruited after ACLR. Intervention(s) Program with a progression algorithm to reintroduce running (10 running sessions in 14 days). Main Outcome Measure(s) The criterion for short-term success was no exacerbation of symptoms. Potential predictors were (1) the International Knee Documentation Committee (IKDC) subjective knee form score, (2) ACL Return to Sport after Injury questionnaire score, (3) quadriceps and hamstrings strength, (4) step-down endurance test, and (5) modified Star Excursion Balance test. Descriptive statistics were performed to study the feasibility of the RTR program, and Poisson regression analysis was used to evaluate predictors of success. Results Of the 34 participants, 33 completed the RTR program. Sixteen participants experienced some temporary exacerbation of symptoms, but only 1 had to stop the program. The initial IKDC score was the only significant predictor of a successful RTR, with an area under the receiver operating characteristic curve of 80.4%. An IKDC cut-off of 63.7/100 differentiated responders and nonresponders with the highest sensitivity and specificity (77.8% and 75.0%, respectively). A participant with an IKDC score above this threshold had a 3-fold greater chance of success. Conclusions Our results confirm the feasibility of our RTR program and progression algorithm after ACLR. Clinicians should use an IKDC score of >64 as a criterion to reintroduce running after ACLR to increase the likelihood of short-term success. }}, author = {{Pairot de Fontenay, Benoit and Van Cant, Joachim and Gokeler, Alli and Roy, Jean-Sébastien}}, issn = {{1938-162X}}, journal = {{Journal of Athletic Training}}, keywords = {{Physical Therapy, Sports Therapy and Rehabilitation, Orthopedics and Sports Medicine, General Medicine}}, number = {{6}}, pages = {{540--546}}, publisher = {{Journal of Athletic Training/NATA}}, title = {{{Reintroduction of Running After Anterior Cruciate Ligament Reconstruction With a Hamstrings Graft: Can We Predict Short-Term Success?}}}, doi = {{10.4085/1062-6050-0407.21}}, volume = {{57}}, year = {{2021}}, } @article{45135, abstract = {{Context: Only 55% of the athletes return to competitive sports after an anterior cruciate ligament (ACL) injury. Athletes younger than 25 years who return to sports have a second injury rate of 23%. There may be a mismatch between rehabilitation contents and the demands an athlete faces after returning to sports. Current return-to-sports (RTS) tests utilize closed and predictable motor skills; however, demands on the field are different. Neurocognitive functions are essential to manage dynamic sport situations and may fluctuate after peripheral injuries. Most RTS and rehabilitation paradigms appear to lack this aspect, which might be linked to increased risk of second injury. Objective: This systematic and scoping review aims to map existing evidence about neurocognitive and neurophysiological functions in athletes, which could be linked to ACL injury in an integrated fashion and bring an extensive perspective to assessment and rehabilitation approaches. Data Sources: PubMed and Cochrane databases were searched to identify relevant studies published between 2005 and 2020 using the keywords ACL, brain, cortical, neuroplasticity, cognitive, cognition, neurocognition, and athletes. Study Selection: Studies investigating either neurocognitive or neurophysiological functions in athletes and linking these to ACL injury regardless of their design and technique were included. Study Design: Systematic review. Level of Evidence: Level 3. Data Extraction: The demographic, temporal, neurological, and behavioral data revealing possible injury-related aspects were extracted and summarized. Results: A total of 16 studies were included in this review. Deficits in different neurocognitive domains and changes in neurophysiological functions could be a predisposing risk factor for, or a consequence caused by, ACL injuries. Conclusion: Clinicians should view ACL injuries not only as a musculoskeletal but also as a neural lesion with neurocognitive and neurophysiological aspects. Rehabilitation and RTS paradigms should consider these changes for assessment and interventions after injury. }}, author = {{Piskin, Daghan and Benjaminse, Anne and Dimitrakis, Panagiotis and Gokeler, Alli}}, issn = {{1941-7381}}, journal = {{Sports Health: A Multidisciplinary Approach}}, keywords = {{Physical Therapy, Sports Therapy and Rehabilitation, Orthopedics and Sports Medicine}}, number = {{4}}, pages = {{549--555}}, publisher = {{SAGE Publications}}, title = {{{Neurocognitive and Neurophysiological Functions Related to ACL Injury: A Framework for Neurocognitive Approaches in Rehabilitation and Return-to-Sports Tests}}}, doi = {{10.1177/19417381211029265}}, volume = {{14}}, year = {{2021}}, } @article{45140, abstract = {{Background: Differential learning (DL) is a motor learning method characterized by high amounts of variability during practice and is claimed to provide the learner with a higher learning rate than other methods. However, some controversy surrounds DL theory, and to date, no overview exists that compares the effects of DL to other motor learning methods.Objective: To evaluate the effectiveness of DL in comparison to other motor learning methods in the acquisition and retention phase.Design: Systematic review and exploratory meta-analysis.Methods: PubMed (MEDLINE), Web of Science, and Google Scholar were searched until February 3, 2020. To be included, (1) studies had to be experiments where the DL group was compared to a control group engaged in a different motor learning method (lack of practice was not eligible), (2) studies had to describe the effects on one or more measures of performance in a skill or movement task, and (3) the study report had to be published as a full paper in a journal or as a book chapter.Results: Twenty-seven studies encompassing 31 experiments were included. Overall heterogeneity for the acquisition phase (post-pre; I2 = 77%) as well as for the retention phase (retention-pre; I2 = 79%) was large, and risk of bias was high. The meta-analysis showed an overall small effect size of 0.26 [0.10, 0.42] in the acquisition phase for participants in the DL group compared to other motor learning methods. In the retention phase, an overall medium effect size of 0.61 [0.30, 0.91] was observed for participants in the DL group compared to other motor learning methods.Discussion/Conclusion: Given the large amount of heterogeneity, limited number of studies, low sample sizes, low statistical power, possible publication bias, and high risk of bias in general, inferences about the effectiveness of DL would be premature. Even though DL shows potential to result in greater average improvements between pre- and post/retention test compared to non-variability-based motor learning methods, more high-quality research is needed before issuing such a statement. For robust comparisons on the relative effectiveness of DL to different variability-based motor learning methods, scarce and inconclusive evidence was found.}}, author = {{Tassignon, Bruno and Verschueren, Jo and Baeyens, Jean-Pierre and Benjaminse, Anne and Gokeler, Alli and Serrien, Ben and Clijsen, Ron}}, issn = {{1664-1078}}, journal = {{Frontiers in Psychology}}, keywords = {{General Psychology}}, publisher = {{Frontiers Media SA}}, title = {{{An Exploratory Meta-Analytic Review on the Empirical Evidence of Differential Learning as an Enhanced Motor Learning Method}}}, doi = {{10.3389/fpsyg.2021.533033}}, volume = {{12}}, year = {{2021}}, } @article{45138, abstract = {{Individuals after anterior cruciate ligament reconstruction (ACLR) have a high rate of reinjury upon return to competitive sports. Deficits in motor control may influence reinjury risk and can be addressed during rehabilitation with motor learning strategies. When instructing patients in performing motor tasks after ACLR, an external focus of attention directed to the intended movement effect has been shown to be more effective in reducing reinjury risk than an internal focus of attention on body movements. While this concept is mostly agreed upon, recent literature has made it clear that the interpretation and implementation of an external focus of attention within ACLR rehabilitation needs to be better described. The purpose of this commentary is to provide a clinical framework for the application of attentional focus strategies and guide clinicians towards effectively utilizing an external focus of attention in rehabilitation after ACLR. Level of Evidence 5 }}, author = {{Singh, Harjiv and Gokeler, Alli and Benjaminse, Anne}}, issn = {{2159-2896}}, journal = {{International Journal of Sports Physical Therapy}}, keywords = {{Rehabilitation, Orthopedics and Sports Medicine, Physical Therapy, Sports Therapy and Rehabilitation}}, number = {{6}}, publisher = {{International Journal of Sports Physical Therapy}}, title = {{{Effective Attentional Focus Strategies after Anterior Cruciate Ligament Reconstruction: A Commentary}}}, doi = {{10.26603/001c.29848}}, volume = {{16}}, year = {{2021}}, } @article{45151, author = {{Dingenen, Bart and Billiet, Bart and De Baets, Liesbet and Bellemans, Johan and Truijen, Jan and Gokeler, Alli}}, issn = {{1466-853X}}, journal = {{Physical Therapy in Sport}}, keywords = {{Physical Therapy, Sports Therapy and Rehabilitation, Orthopedics and Sports Medicine, General Medicine}}, pages = {{68--76}}, publisher = {{Elsevier BV}}, title = {{{Rehabilitation strategies of Flemish physical therapists before and after anterior cruciate ligament reconstruction: An online survey}}}, doi = {{10.1016/j.ptsp.2021.02.003}}, volume = {{49}}, year = {{2021}}, } @misc{42317, author = {{N., N.}}, publisher = {{Universität Paderborn}}, title = {{{Die Aufteilung der Barentsseegebiete mithilfe des Adjusted Winner Verfahrens bei asymmetrischen Machtverhältnissen}}}, year = {{2021}}, } @misc{42315, author = {{N., N.}}, publisher = {{Universität Paderborn}}, title = {{{Versionisierung von Serviceleistungen auf Videoplattformen}}}, year = {{2021}}, } @misc{42321, author = {{N., N.}}, publisher = {{Universität Paderborn}}, title = {{{Kindergarten Allocation through Matching Mechanisms}}}, year = {{2021}}, } @misc{42309, author = {{N., N.}}, publisher = {{Universität Paderborn}}, title = {{{Faire Profitverteilung in Energienetzwerken - eine spieltheoretische Analyse von Microgrids}}}, year = {{2021}}, } @misc{42311, author = {{N., N.}}, publisher = {{Universität Paderborn}}, title = {{{"First-Party-Content" auf zweiseitigen Märkten}}}, year = {{2021}}, } @misc{42314, author = {{N., N.}}, publisher = {{Universität Paderborn}}, title = {{{Stability in many-to-many matchings with contracts}}}, year = {{2021}}, } @misc{42313, author = {{N., N.}}, publisher = {{Universität Paderborn}}, title = {{{Preissetzungsstrategien für Neuprodukte}}}, year = {{2021}}, } @misc{42310, author = {{N., N.}}, publisher = {{Universität Paderborn}}, title = {{{Co-opetition in Two-Sided Markets}}}, year = {{2021}}, } @misc{42312, author = {{N., N.}}, publisher = {{Universität Paderborn}}, title = {{{Matching mit Minderheiten}}}, year = {{2021}}, } @misc{42316, author = {{N., N.}}, publisher = {{Universität Paderborn}}, title = {{{Piracy and Visioning}}}, year = {{2021}}, } @misc{42303, author = {{N., N.}}, publisher = {{Universität Paderborn}}, title = {{{Revenue Sharing Contracts: Horizontale Koordination in der E-Commerce-Logistik}}}, year = {{2021}}, } @misc{45236, author = {{N., N.}}, title = {{{Design and Implementation of a Crowd-based Prototype Validation Platform}}}, year = {{2021}}, } @misc{45237, author = {{N., N.}}, title = {{{Model-based Continuous Experimentation for Software Product Prototypes}}}, year = {{2021}}, } @misc{45239, author = {{N., N.}}, title = {{{Lightweight Process Engine for Situation-specific Development of Business Models for Digital Platforms}}}, year = {{2021}}, } @misc{45240, author = {{N., N.}}, title = {{{Development and Evaluation of a Multi Platform Approach for Augmented Reality Product Configuration}}}, year = {{2021}}, } @misc{45238, author = {{N., N.}}, title = {{{Model-based Feature Backlog Synchronization for Dual-Track Development Methods}}}, year = {{2021}}, } @article{24009, abstract = {{Heat-assisted forming processes are becoming increasingly important in the manufacturing of sheet metal parts for body-in-white applications. However, the non-isothermal nature of these processes leads to challenges in evaluating the forming limits, since established methods such as Forming Limit Curves (FLCs) only allow the assessment of critical forming strains for steady temperatures. For this reason, a temperature-dependent extension of the well-established GISSMO (Generalized Incremental Stress State Dependent Damage Model) fracture indicator framework is developed by the authors to predict forming failures under non-isothermal conditions. In this paper, a general approach to combine several isothermal FLCs within the temperature-extended GISSMO model into a temperature-dependent forming limit surface is investigated. The general capabilities of the model are tested in a coupled thermo-mechanical FEA using the example of warm forming of an AA5182-O sheet metal cross-die cup. The obtained results are then compared with state of the art of evaluation methods. By taking the strain and temperature path into account, GISSMO predicts greater drawing depths by up to 20% than established methods. In this way the forming and so the lightweight potential of sheet metal parts can by fully exploited. Moreover, the risk and locus of failure can be evaluated directly on the part geometry by a contour plot. An additional advantage of the GISSMO model is the applicability for low triaxialities as well as the possibility to predict the materials behavior beyond necking up to ductile fracture.}}, author = {{Camberg, Alan Adam and Erhart, Tobias and Tröster, Thomas}}, issn = {{1996-1944}}, journal = {{Materials}}, title = {{{A Generalized Stress State and Temperature Dependent Damage Indicator Framework for Ductile Failure Prediction in Heat-Assisted Forming Operations}}}, doi = {{10.3390/ma14175106}}, year = {{2021}}, } @misc{45254, author = {{Anonymous, Anonymous}}, title = {{{Device-Independent Security Proofs Via Entropy Accumulation}}}, year = {{2021}}, } @inbook{42253, author = {{Saad, Nadia}}, booktitle = {{Methoden der Darstellung und Analyse interreligiöser Diskurse}}, pages = {{354--355}}, publisher = {{Ergon Verlag}}, title = {{{David und Salomo im Koran: ein Komparativ-theologischer Ansatz}}}, volume = {{1}}, year = {{2021}}, } @article{42256, author = {{Mir Sadri, Seyedeh Saeideh and Nasiri, Mansour}}, journal = {{Philosophy East and West}}, number = {{2}}, pages = {{414--430}}, publisher = {{University of Hawai'i Press}}, title = {{{Reading Iqbal in the Light of Kierkegaard; towards an Existentialist Approach to Islam}}}, volume = {{71}}, year = {{2021}}, } @article{42257, author = {{Mir Sadri, Seyedeh Saeideh}}, journal = {{Amos-international}}, number = {{1}}, pages = {{27--35}}, title = {{{Fratelli e sorelle tutti. Die Sozialenzyklika aus islamischer Sicht}}}, volume = {{15}}, year = {{2021}}, } @inbook{45275, author = {{Eikermann, Larissa}}, booktitle = {{Das Erbe der Kinder: Provenienzforschung und Sammlungsgeschichte von Kinder- und Jugendzeichnungen: Museen, Archive, private Kollektionen und "verschwundene Sammlungen" = The children's heritage: provenance research and the history of children's and youth drawings collections: museums, archives, private holdings and "lost collections"}}, editor = {{Ströter-Bender, Jutta}}, isbn = {{9783828876668}}, pages = {{103--112}}, publisher = {{Tectum Verlag}}, title = {{{"Ein altes Familientalent" - Kinderzeichnungen aus der Familie der Brüder Grimm (1. Hälfte 19. Jh.) in der Grimm-Sammlung der Stadt Kassel. Germany}}}, doi = {{10.5771/9783828876668}}, volume = {{Bd. 30}}, year = {{2021}}, } @inbook{45276, author = {{Eikermann, Larissa}}, booktitle = {{Das Erbe der Kinder: Provenienzforschung und Sammlungsgeschichte von Kinder- und Jugendzeichnungen: Museen, Archive, private Kollektionen und "verschwundene Sammlungen" = The children's heritage: provenance research and the history of children's and youth drawings collections: museums, archives, private holdings and "lost collections"}}, editor = {{Ströter-Bender, Jutta}}, isbn = {{9783828876668}}, pages = {{171--179}}, publisher = {{Tectum Verlag}}, title = {{{Children´s drawings on Pippi & Co. - A visit to the Astrid Lindgren Archive in the Royal Library of Stockholm. Sweden}}}, doi = {{10.5771/9783828876668}}, volume = {{Bd. 30}}, year = {{2021}}, } @inbook{42096, author = {{Kamcili-Yildiz, Naciye}}, booktitle = {{Interreligiöse Öffnung durch Begegnung. Grundlagen - Erfahrungen - Perspektiven im Kontext des christlich-islamischen Dialogs}}, editor = {{Espelage, Christian and Mohagheghi, Hamideh and Schober, Michael}}, pages = {{301 -- 310}}, publisher = {{Universitätsverlag Hildesheim, Georg Olms Verlag}}, title = {{{Begegnungslernen in den Kerncurricula des islamischen Religionsunterrichts}}}, volume = {{43}}, year = {{2021}}, } @book{42058, author = {{Kamcili-Yildiz, Naciye}}, isbn = {{973-3830942958}}, publisher = {{Waxmann Verlag}}, title = {{{Zwischen Glaubensvermittlung und Reflexivität: Eine quantitative Studie zu professionellen Kompetenzen von islamischen ReligionslehrerInnen}}}, volume = {{682}}, year = {{2021}}, } @article{42265, author = {{Mustafa, Abdul Rahman}}, journal = {{Political Theology}}, number = {{8}}, pages = {{699--719}}, publisher = {{Taylor and Francis}}, title = {{{Supernatural, Unnatural, Queer: Gratitude and Nature in Islamic Political Theology}}}, volume = {{22}}, year = {{2021}}, } @article{42224, author = {{Aghaei Abrandabadi, Seyed Ali and Marx, Michel}}, journal = {{Journal of Iranian National Museum}}, number = {{1}}, pages = {{205--226}}, title = {{{Carbon Dating of Seven Parchment Qurʾān Manuscripts and One Syriac Bible of the National Museum of Iran}}}, volume = {{2}}, year = {{2021}}, } @article{42341, author = {{Ghaffar, Zishan}}, journal = {{Der Islam}}, number = {{2}}, pages = {{313--358}}, title = {{{Kontrafaktische Intertextualität im Koran und die exegetische Tradition des syrischen Christentums}}}, volume = {{98}}, year = {{2021}}, } @inbook{37120, author = {{Tatari, Muna}}, booktitle = {{Islamische Theologie in Deutschland. Ein Modell für Europa und die Welt}}, editor = {{Khalfaoui, Mouez and Ehret, Jean}}, isbn = {{9783451391439}}, pages = {{192 -- 209}}, publisher = {{Herder}}, title = {{{Islamische systematische Theologie in Deutschland: Konturen eines jungen Faches}}}, year = {{2021}}, } @book{37035, author = {{Tatari, Muna and von Stosch, Klaus}}, isbn = {{3451389649}}, pages = {{432}}, publisher = {{Herder}}, title = {{{Prophetin - Jungfrau - Mutter: Maria im Koran}}}, year = {{2021}}, } @misc{42479, author = {{Nassery, Idris}}, booktitle = {{Frankfurter Allgemeine Zeitung}}, title = {{{Die unerwünschte Empfehlung, Hybris: Woran der Westen in Afghanistan tatsächlich gescheitert ist}}}, year = {{2021}}, } @article{45177, author = {{Kulgemeyer, Christoph and Kempin, Maren and Weißbach, Anna and Borowski, Andreas and Buschhüter, David and Enkrott, Patrick and Reinhold, Peter and Riese, Josef and Schecker, Horst and Schröder, Jan and Vogelsang, Christoph}}, issn = {{0950-0693}}, journal = {{International Journal of Science Education}}, keywords = {{Education}}, number = {{18}}, pages = {{3035--3057}}, publisher = {{Informa UK Limited}}, title = {{{Exploring the impact of pre-service science teachers’ reflection skills on the development of professional knowledge during a field experience}}}, doi = {{10.1080/09500693.2021.2006820}}, volume = {{43}}, year = {{2021}}, } @inproceedings{45407, author = {{Große-Heilmann, Rike Isabel and Burde, Jan-Philipp and Riese, Josef and Schubatzky, Thomas and Weiler, David}}, booktitle = {{PhyDid B-Didaktik der Physik-Beiträge zur DPG-Frühjahrstagung 2021}}, pages = {{171--178}}, title = {{{Erwerb und Messung physikdidaktischer Kompetenzen zum Einsatz digitaler Medien}}}, year = {{2021}}, } @inproceedings{45408, author = {{Weiler, David and Burde, Jan-Philipp and Große-Heilmann, Rike Isabel and Lachner, Andreas and Riese, Josef and Schubatzky, Thomas}}, booktitle = {{PhyDid B-Didaktik der Physik-Beiträge zur DPG-Frühjahrstagung 2021}}, pages = {{209--216}}, title = {{{Entwicklung eines Seminars zur Förderung des Konzeptverständnisses mittels digitaler Medien}}}, year = {{2021}}, } @inbook{45436, author = {{Haghani Fazl, Mohammad}}, booktitle = {{Impeccability and Temptation: Understanding Christ's Divine and Human Will}}, editor = {{Grössl, Johannes and von Stosch, Klaus}}, pages = {{235--252}}, publisher = {{Routledge Verlag}}, title = {{{The Scope of ‘iṣma and Qur’anic Evidence}}}, year = {{2021}}, } @article{41511, author = {{Hein, Maxwell and Hoyer, Kay-Peter and Schaper, Mirko}}, issn = {{0933-5137}}, journal = {{Materialwissenschaft und Werkstofftechnik}}, keywords = {{Mechanical Engineering, Mechanics of Materials, Condensed Matter Physics, General Materials Science}}, number = {{7}}, pages = {{703--716}}, publisher = {{Wiley}}, title = {{{Additively processed TiAl6Nb7 alloy for biomedical applications}}}, doi = {{10.1002/mawe.202000288}}, volume = {{52}}, year = {{2021}}, } @article{41507, abstract = {{ Purpose The currently existing restrictions regarding the deployment of additively manufactured components because of poor surface roughness, porosity and residual stresses as well as their influence on the low-cycle fatigue (LCF) strength are addressed in this paper. Design/methodology/approach This study aims to evaluating the effect of different pre- and post-treatments on the LCF strength of additively manufactured 316L parts. Therefore, 316L specimens manufactured by laser powder bed fusion were examined in their as-built state as well as after grinding, or coating with regard to the surface roughness, residual stresses and LCF strength. To differentiate between topographical effects and residual stress-related phenomena, stress-relieved 316L specimens served as a reference throughout the investigations. To enable an alumina coating of the 316L components, atmospheric plasma spraying was used, and the near-surface residual stresses and the surface roughness are measured and investigated. Findings The results have shown that the applied pre- and post-treatments such as stress-relief heat treatment, grinding and alumina coating have each led to an increase in LCF strength of the 316L specimens. In contrast, the non-heat-treated specimens predominantly exhibited coating delamination. Originality/value To the best of the authors’ knowledge, this is the first study of the correlation between the LCF behavior of additively manufactured uncoated 316L specimens in comparison with additively manufactured 316L specimens with an alumina coating. }}, author = {{Garthe, Kai-Uwe and Hoyer, Kay-Peter and Hagen, Leif and Tillmann, Wolfgang and Schaper, Mirko}}, issn = {{1355-2546}}, journal = {{Rapid Prototyping Journal}}, keywords = {{Industrial and Manufacturing Engineering, Mechanical Engineering}}, number = {{5}}, pages = {{833--840}}, publisher = {{Emerald}}, title = {{{Correlation between pre- and post-treatments of additively manufactured 316L parts and the resulting low cycle fatigue behavior}}}, doi = {{10.1108/rpj-01-2021-0017}}, volume = {{28}}, year = {{2021}}, } @article{41506, abstract = {{Processing aluminum alloys employing powder bed fusion of metals (PBF-LB/M) is becoming more attractive for the industry, especially if lightweight applications are needed. Unfortunately, high-strength aluminum alloys such as AA7075 are prone to hot cracking during PBF-LB/M, as well as welding. Both a large solidification range promoted by the alloying elements zinc and copper and a high thermal gradient accompanied with the manufacturing process conditions lead to or favor hot cracking. In the present study, a simple method for modifying the powder surface with titanium carbide nanoparticles (NPs) as a nucleating agent is aimed. The effect on the microstructure with different amounts of the nucleating agent is shown. For the aluminum alloy 7075 with 2.5 ma% titanium carbide nanoparticles, manufactured via PBF-LB/M, crack-free samples with a refined microstructure having no discernible melt pool boundaries and columnar grains are observed. After using a two-step ageing heat treatment, ultimate tensile strengths up to 465 MPa and an 8.9% elongation at break are achieved. Furthermore, it is demonstrated that not all nanoparticles used remain in the melt pool during PBF-LB/M.}}, author = {{Heiland, Steffen and Milkereit, Benjamin and Hoyer, Kay-Peter and Zhuravlev, Evgeny and Kessler, Olaf and Schaper, Mirko}}, issn = {{1996-1944}}, journal = {{Materials}}, keywords = {{General Materials Science}}, number = {{23}}, publisher = {{MDPI AG}}, title = {{{Requirements for Processing High-Strength AlZnMgCu Alloys with PBF-LB/M to Achieve Crack-Free and Dense Parts}}}, doi = {{10.3390/ma14237190}}, volume = {{14}}, year = {{2021}}, } @article{24790, abstract = {{Implants often overtake body function just for a certain time and remain as an unnecessary foreign body or have to be removed. Thus, resorbable implants are highly beneficial to reduce patient burden. Besides established materials, Iron-(Fe)-based alloys are in focus due to superior mechanical properties and good biocompatibility. However, their degradation rate needs to be increased. Phases with high electrochemical potential could promote the dissolution of residual material based on the galvanic coupling. Silver (Ag) is promising due to its high electrochemical potential (+0.8 V vs. SHE), immiscibility with Fe, biocompatibility, and anti-bacterial properties. But to prevent adverse consequences the Ag-particles, remaining after dissolution of the matrix, need to dissolve. Thus, a bioresorbable Ag-alloy is required. Regarding the electrochemical potential and degradation behavior of binary alloys, Cerium (Ce) and Lanthanum (La) are well-suited considering their biocompatibility and antibacterial behavior. Accordingly, this research addresses AgCe and AgCeLa alloys as additives for Fe-based materials with adapted degradation behavior. Furthermore, degradable Ag-alloys combined with inert implant materials could enable the controlled release of antibacterial active Ag-ions.}}, author = {{Krüger, Jan Tobias and Hoyer, Kay-Peter and Schaper, Mirko}}, issn = {{0167-577X}}, journal = {{Materials Letters}}, title = {{{Bioresorbable AgCe and AgCeLa alloys for adapted Fe-based implants}}}, doi = {{10.1016/j.matlet.2021.130890}}, volume = {{306}}, year = {{2021}}, } @article{41516, author = {{Tillmann, Wolfgang and Lopes Dias, Nelson Filipe and Franke, Carlo and Kokalj, David and Stangier, Dominic and Filor, Viviane and Mateus-Vargas, Rafael Hernán and Oltmanns, Hilke and Kietzmann, Manfred and Meißner, Jessica and Hein, Maxwell and Pramanik, Sudipta and Hoyer, Kay-Peter and Schaper, Mirko and Nienhaus, Alexander and Thomann, Carl Arne and Debus, Jörg}}, issn = {{0257-8972}}, journal = {{Surface and Coatings Technology}}, keywords = {{Materials Chemistry, Surfaces, Coatings and Films, Surfaces and Interfaces, Condensed Matter Physics, General Chemistry}}, publisher = {{Elsevier BV}}, title = {{{Tribo-mechanical properties and biocompatibility of Ag-containing amorphous carbon films deposited onto Ti6Al4V}}}, doi = {{10.1016/j.surfcoat.2021.127384}}, volume = {{421}}, year = {{2021}}, } @article{41512, author = {{Andreiev, Anatolii and Hoyer, Kay-Peter and Dula, Dimitri and Hengsbach, Florian and Grydin, Olexandr and Frolov, Yaroslav and Schaper, Mirko}}, issn = {{0921-5093}}, journal = {{Materials Science and Engineering: A}}, keywords = {{Mechanical Engineering, Mechanics of Materials, Condensed Matter Physics, General Materials Science}}, publisher = {{Elsevier BV}}, title = {{{Laser beam melting of functionally graded materials with application-adapted tailoring of magnetic and mechanical performance}}}, doi = {{10.1016/j.msea.2021.141662}}, volume = {{822}}, year = {{2021}}, } @article{41510, author = {{Pramanik, Sudipta and Andreiev, Anatolii and Hoyer, Kay-Peter and Schaper, Mirko}}, issn = {{0142-1123}}, journal = {{International Journal of Fatigue}}, keywords = {{Industrial and Manufacturing Engineering, Mechanical Engineering, Mechanics of Materials, General Materials Science, Modeling and Simulation}}, publisher = {{Elsevier BV}}, title = {{{Quasi in-situ analysis of fracture path during cyclic loading of double-edged U notched additively manufactured FeCo alloy}}}, doi = {{10.1016/j.ijfatigue.2021.106498}}, volume = {{153}}, year = {{2021}}, } @article{41509, author = {{Krüger, Jan Tobias and Hoyer, Kay-Peter and Schaper, Mirko}}, issn = {{0167-577X}}, journal = {{Materials Letters}}, keywords = {{Mechanical Engineering, Mechanics of Materials, Condensed Matter Physics, General Materials Science}}, publisher = {{Elsevier BV}}, title = {{{Bioresorbable AgCe and AgCeLa alloys for adapted Fe-based implants}}}, doi = {{10.1016/j.matlet.2021.130890}}, volume = {{306}}, year = {{2021}}, } @article{23898, author = {{Andreiev, Anatolii and Hoyer, Kay-Peter and Dula, Dimitri and Hengsbach, Florian and Haase, Michael and Gierse, Jan and Zimmer, Detmar and Tröster, Thomas and Schaper, Mirko}}, issn = {{0924-0136}}, journal = {{Journal of Materials Processing Technology}}, title = {{{Soft-magnetic behavior of laser beam melted FeSi3 alloy with graded cross-section}}}, doi = {{10.1016/j.jmatprotec.2021.117183}}, year = {{2021}}, } @article{41517, abstract = {{AbstractWithin this research, the multiscale microstructural evolution before and after the tensile test of a FeCo alloy is addressed. X-ray µ-computer tomography (CT), electron backscattered diffraction (EBSD), and transmission electron microscopy (TEM) are employed to determine the microstructure on different length scales. Microstructural evolution is studied by performing EBSD of the same area before and after the tensile test. As a result, $$\langle$$ 001$$\rangle$$ ||TD, $$\langle$$ 011$$\rangle$$ ||TD are hard orientations and $$\langle$$ 111$$\rangle$$ ||TD is soft orientations for deformation accommodation. It is not possible to predict the deformation of a single grain with the Taylor model. However, the Taylor model accurately predicts the orientation of all grains after deformation. {123}$$\langle$$ 111$$\rangle$$ is the most active slip system, and {112}$$\langle$$ 111$$\rangle$$ is the least active slip system. Both EBSD micrographs show grain subdivision after tensile testing. TEM images show the formation of dislocation cells. Correlative HRTEM images show unresolved lattice fringes at dislocation cell boundaries, whereas resolved lattice fringes are observed at dislocation cell interior. Since Schmid’s law is unable to predict the deformation behavior of grains, the boundary slip transmission accurately predicts the grain deformation behavior.}}, author = {{Pramanik, Sudipta and Tasche, Lennart and Hoyer, Kay-Peter and Schaper, Mirko}}, issn = {{1059-9495}}, journal = {{Journal of Materials Engineering and Performance}}, keywords = {{Mechanical Engineering, Mechanics of Materials, General Materials Science}}, number = {{11}}, pages = {{8048--8056}}, publisher = {{Springer Science and Business Media LLC}}, title = {{{Correlation between Taylor Model Prediction and Transmission Electron Microscopy-Based Microstructural Investigations of Quasi-In Situ Tensile Deformation of Additively Manufactured FeCo Alloy}}}, doi = {{10.1007/s11665-021-06065-9}}, volume = {{30}}, year = {{2021}}, } @article{24243, abstract = {{The addition of Ag to amorphous carbon (a-C) films is highly effective in tailoring the tribo-mechanical properties and biocompatibility. For biomedical applications, Ag-containing a-C (a-C:Ag) represents a promising film material for improving the biofunctional surface properties of Ti-based alloys. In a sputtering process, a-C:Ag films, with Ag contents up to 7.5 at.%, were deposited with a chemically graded TixCy interlayer onto Ti6Al4V. The tribo-mechanical and biocompatible properties of a-C:Ag were evaluated. The influence of the Ag content on these properties was analyzed and compared to those of uncoated Ti6Al4V. Raman spectroscopy reveals that the amount of incorporated Ag does not induce significant structural changes in the disordered network, only a reduced number of vacancies and sp3-coordinated C bonds within the sp2-dominant a-C network is assigned to the films with high Ag concentration. With increasing Ag content, stresses, hardness, and elastic modulus decrease from (2.02 ± 0.07) to (1.15 ± 0.03) GPa, from (17.4 ± 1.5) to (13.4 ± 0.9) GPa, and from (171.8 ± 8.1) to (138.5 ± 5.8) GPa, respectively. In tribometer tests, the friction behavior against Al2O3 in lubricated condition with a simulated-body-fluid-based lubricant is not affected by the Ag concentration, but the Al2O3 counterpart wear is reduced for all a-C:Ag films compared to a-C. The friction against ultra-high-molecular-weight polyethylene (UHMWPE) decreases continuously with increasing Ag concentration and the counterpart wear is lower at higher Ag contents. Compared to a-C:Ag, Ti6Al4V demonstrates lower friction against UHMWPE and higher friction against Al2O3. The a-C:Ag films are not exposed to abrasion by Al2O3 or pronounced material transfer of UHMWPE. The hardness difference and chemical affinity between the friction partners are decisive for the tribological behavior of a-C:Ag. Compared to Ti6Al4V, the a-C:Ag films show antibacterial activity against Staphylococcus aureus, while the proliferation of osteoblast-like cells is reduced by Ag.}}, author = {{Tillmann, Wolfgang and Lopes Dias, Nelson Filipe and Franke, Carlo and Kokalj, David and Stangier, Dominic and Filor, Viviane and Mateus-Vargas, Rafael Hernán and Oltmanns, Hilke and Kietzmann, Manfred and Meißner, Jessica and Hein, Maxwell and Pramanik, Sudipta and Hoyer, Kay-Peter and Schaper, Mirko and Nienhaus, Alexander and Thomann, Carl Arne and Debus, Jörg}}, issn = {{0257-8972}}, journal = {{Surface and Coatings Technology}}, title = {{{Tribo-mechanical properties and biocompatibility of Ag-containing amorphous carbon films deposited onto Ti6Al4V}}}, doi = {{10.1016/j.surfcoat.2021.127384}}, year = {{2021}}, } @article{29815, abstract = {{Aluminium steel clad materials have high potential for industrial applications. Their mechanical properties are governed by an intermetallic layer, which forms upon heat treatment at the Al-Fe interface. Transmission electron microscopy was employed to identify the phases present at the interface by selective area electron diffraction and energy dispersive spectroscopy. Three phases were identified: orthorhombic Al5Fe2, monoclinic Al13Fe4 and cubic Al19Fe4MnSi2. An effective interdiffusion coefficient dependent on concentration was determined according to the Boltzmann–Matano method. The highest value of the interdiffusion coefficient was reached at the composition of the intermetallic phases. Afterwards, the process of diffusion considering the evaluated interdiffusion coefficient was simulated using the finite element method. Results of the simulations revealed that growth of the intermetallic phases proceeds preferentially in the direction of aluminium.}}, author = {{Křivská, Barbora and Šlapáková, Michaela and Veselý, Jozef and Kihoulou, Martin and Fekete, Klaudia and Minárik, Peter and Králík, Rostislav and Grydin, Olexandr and Stolbchenko, Mykhailo and Schaper, Mirko}}, issn = {{1996-1944}}, journal = {{Materials}}, keywords = {{General Materials Science}}, number = {{24}}, publisher = {{MDPI AG}}, title = {{{Intermetallic Phases Identification and Diffusion Simulation in Twin-Roll Cast Al-Fe Clad Sheet}}}, doi = {{10.3390/ma14247771}}, volume = {{14}}, year = {{2021}}, } @article{24086, abstract = {{Laser beam melting (LBM) is an advanced manufacturing technology providing special features and the possibility to produce complex and individual parts directly from a CAD model. TiAl6V4 is the most common used titanium alloy particularly in biomedical applications. TiAl6Nb7 shows promising improvements especially regarding biocompatible properties due to the substitution of the hazardous vanadium. This work focuses on the examination of laser beam melted TiAl6Nb7. For microstructural investigation scanning electron microscopy including energydispersive x-ray spectroscopy as well as electron backscatter diffraction are utilized. The laser beam melted related acicular microstructure as well as the corresponding mechanical properties, which are determined by hardness measurements and tensile tests, are investigated. The laser beam melted alloy meets, except of breaking elongation A, the mechanical demands like ultimate tensile strength Rm, yield strength Rp0.2, Vickers hardness HV of international standard ISO 5832-11. Next steps contain comparison between TiAl6Nb7 and TiAl6V4 in different conditions. Further investigations aim at improving mechanical properties of TiAl6Nb7 by heat treatments and assessment of their influence on the microstructure as well as examination regarding the corrosive behavior in human bodylike conditions.}}, author = {{Hein, Maxwell and Hoyer, Kay-Peter and Schaper, Mirko}}, issn = {{0933-5137}}, journal = {{Materialwissenschaft und Werkstofftechnik}}, keywords = {{Laser beam melting, titanium alloy, TiAl6Nb7, biomedical engineering, implants}}, pages = {{703--716}}, title = {{{Additively processed TiAl6Nb7 alloy for biomedical applications}}}, doi = {{10.1002/mawe.202000288}}, volume = {{52}}, year = {{2021}}, } @article{29813, author = {{Cieslar, Miroslav and Králík, Rostislav and Bajtošová, Lucia and Křivská, Barbora and Hájek, Michal and Belejová, Sára and Grydin, Olexandr and Stolbchenko, Mykhailo and Schaper, Mirko}}, issn = {{1431-9276}}, journal = {{Microscopy and Microanalysis}}, keywords = {{Instrumentation}}, number = {{S2}}, pages = {{79--80}}, publisher = {{Cambridge University Press (CUP)}}, title = {{{High Temperature Annealing of Twin-Roll Cast Al-Li-Based Alloy Studied by In-situ SEM and STEM}}}, doi = {{10.1017/s1431927621013398}}, volume = {{27}}, year = {{2021}}, } @article{41514, author = {{Krüger, Jan Tobias and Hoyer, Kay-Peter and Filor, Viviane and Pramanik, Sudipta and Kietzmann, Manfred and Meißner, Jessica and Schaper, Mirko}}, issn = {{0925-8388}}, journal = {{Journal of Alloys and Compounds}}, keywords = {{Materials Chemistry, Metals and Alloys, Mechanical Engineering, Mechanics of Materials}}, publisher = {{Elsevier BV}}, title = {{{Novel AgCa and AgCaLa alloys for Fe-based bioresorbable implants with adapted degradation}}}, doi = {{10.1016/j.jallcom.2021.159544}}, volume = {{871}}, year = {{2021}}, } @article{29814, author = {{Křivská, Barbora and Šlapáková, Michaela and Minárik, Peter and Fekete, Klaudia and Králík, Rostislav and Stolbchenko, Mykhailo and Schaper, Mirko and Grydin, Olexandr}}, issn = {{1431-9276}}, journal = {{Microscopy and Microanalysis}}, keywords = {{Instrumentation}}, number = {{S2}}, pages = {{91--92}}, publisher = {{Cambridge University Press (CUP)}}, title = {{{Intermetallic Phase Growth in Al-steel Clad Strip during In-situ Heating in TEM}}}, doi = {{10.1017/s1431927621013453}}, volume = {{27}}, year = {{2021}}, } @article{41515, author = {{Pramanik, Sudipta and Tasche, Lennart and Hoyer, Kay-Peter and Schaper, Mirko}}, issn = {{2214-8604}}, journal = {{Additive Manufacturing}}, keywords = {{Industrial and Manufacturing Engineering, Engineering (miscellaneous), General Materials Science, Biomedical Engineering}}, publisher = {{Elsevier BV}}, title = {{{Investigating the microstructure of an additively manufactured FeCo alloy: an electron microscopy study}}}, doi = {{10.1016/j.addma.2021.102087}}, volume = {{46}}, year = {{2021}}, } @article{27700, author = {{Camberg, Alan Adam and Andreiev, Anatolii and Pramanik, Sudipta and Hoyer, Kay-Peter and Tröster, Thomas and Schaper, Mirko}}, issn = {{0921-5093}}, journal = {{Materials Science and Engineering: A}}, publisher = {{Elsevier}}, title = {{{Strength enhancement of AlMg sheet metal parts by rapid heating and subsequent cold die stamping of severely cold-rolled blanks}}}, doi = {{10.1016/j.msea.2021.142312}}, year = {{2021}}, } @article{24090, abstract = {{AbstractWithin this research, the multiscale microstructural evolution before and after the tensile test of a FeCo alloy is addressed. X-ray µ-computer tomography (CT), electron backscattered diffraction (EBSD), and transmission electron microscopy (TEM) are employed to determine the microstructure on different length scales. Microstructural evolution is studied by performing EBSD of the same area before and after the tensile test. As a result, $$\langle$$ 001$$\rangle$$ ||TD, $$\langle$$ 011$$\rangle$$ ||TD are hard orientations and $$\langle$$ 111$$\rangle$$ ||TD is soft orientations for deformation accommodation. It is not possible to predict the deformation of a single grain with the Taylor model. However, the Taylor model accurately predicts the orientation of all grains after deformation. {123}$$\langle$$ 111$$\rangle$$ is the most active slip system, and {112}$$\langle$$ 111$$\rangle$$ is the least active slip system. Both EBSD micrographs show grain subdivision after tensile testing. TEM images show the formation of dislocation cells. Correlative HRTEM images show unresolved lattice fringes at dislocation cell boundaries, whereas resolved lattice fringes are observed at dislocation cell interior. Since Schmid’s law is unable to predict the deformation behavior of grains, the boundary slip transmission accurately predicts the grain deformation behavior.}}, author = {{Pramanik, Sudipta and Tasche, Lennart and Hoyer, Kay-Peter and Schaper, Mirko}}, issn = {{1059-9495}}, journal = {{Journal of Materials Engineering and Performance}}, title = {{{Correlation between Taylor Model Prediction and Transmission Electron Microscopy-Based Microstructural Investigations of Quasi-In Situ Tensile Deformation of Additively Manufactured FeCo Alloy}}}, doi = {{10.1007/s11665-021-06065-9}}, year = {{2021}}, } @article{27509, abstract = {{ Purpose The currently existing restrictions regarding the deployment of additively manufactured components because of poor surface roughness, porosity and residual stresses as well as their influence on the low-cycle fatigue (LCF) strength are addressed in this paper. Design/methodology/approach This study aims to evaluating the effect of different pre- and post-treatments on the LCF strength of additively manufactured 316L parts. Therefore, 316L specimens manufactured by laser powder bed fusion were examined in their as-built state as well as after grinding, or coating with regard to the surface roughness, residual stresses and LCF strength. To differentiate between topographical effects and residual stress-related phenomena, stress-relieved 316L specimens served as a reference throughout the investigations. To enable an alumina coating of the 316L components, atmospheric plasma spraying was used, and the near-surface residual stresses and the surface roughness are measured and investigated. Findings The results have shown that the applied pre- and post-treatments such as stress-relief heat treatment, grinding and alumina coating have each led to an increase in LCF strength of the 316L specimens. In contrast, the non-heat-treated specimens predominantly exhibited coating delamination. Originality/value To the best of the authors’ knowledge, this is the first study of the correlation between the LCF behavior of additively manufactured uncoated 316L specimens in comparison with additively manufactured 316L specimens with an alumina coating. }}, author = {{Garthe, Kai-Uwe and Hoyer, Kay-Peter and Hagen, Leif and Tillmann, Wolfgang and Schaper, Mirko}}, issn = {{1355-2546}}, journal = {{Rapid Prototyping Journal}}, title = {{{Correlation between pre- and post-treatments of additively manufactured 316L parts and the resulting low cycle fatigue behavior}}}, doi = {{10.1108/rpj-01-2021-0017}}, year = {{2021}}, } @article{24087, abstract = {{Resorbable implants are highly beneficial to reduce patient burden since they need not be removed after a defined period. Currently, magnesium (Mg) and polymers are being applied as bioresorbable materials. However, for some applications the insufficient mechanical properties and high degradation rate of Mg cause the need for new materials. Iron (Fe)-based alloys are promising due to their biocompatibility and good mechanical properties, but their degradation rate is too low and needs to be adapted eg. via alloying with manganese (Mn). Besides, phases with high electrochemical potential lead to increased degradation of residual material with lower potential based on the galvanic coupling. Here, silver (Ag) is promising for the formation of such phases due to its high electrochemical potential (+0.8 V vs. SHE), immiscibility with Fe, biocompatibility, and anti-bacterial properties. Since remaining silver particles can lead to adverse consequences as thrombosis, these particles need to dissolve after the matrix material. Thus a silver alloy with high electrochemical potential, biocompatibility, and adjusted degradation behavior is required as an additive for iron-based bioresorbable materials. Several silver alloying systems are possible, but regarding the electrochemical potential and degradation behavior of binary alloys, calcium (Ca) and lanthanum (La) are best-suited considering their biocompatibility. Accordingly, this research addresses AgCa and AgCaLa alloys as additives for iron-based degradable materials with adapted degradation behavior.}}, author = {{Krüger, Jan Tobias and Hoyer, Kay-Peter and Filor, Viviane and Pramanik, Sudipta and Kietzmann, Manfred and Meißner, Jessica and Schaper, Mirko}}, issn = {{0925-8388}}, journal = {{Journal of Alloys and Compounds}}, title = {{{Novel AgCa and AgCaLa alloys for Fe-based bioresorbable implants with adapted degradation}}}, doi = {{10.1016/j.jallcom.2021.159544}}, year = {{2021}}, } @article{23913, abstract = {{Implementing the concept of mixed construction in modern automotive engineering requires the joining of sheet metal or extruded profiles with cast components made from different materials. As weight reduction is desired, these cast components are usually made from high-strength aluminium alloys of the Al-Si (Mn, Mg) system, which have limited weldability. The mechanical joinability of the cast components depends on their ductility, which is influenced by the microstructure. High-strength cast aluminium alloys have relatively low ductility, which leads to cracking of the joints. This limits the range of applications for cast aluminium alloys. In this study, an aluminium alloy of the Al-Si system AlSi9 is used to investigate relationships between solidification conditions during the sand casting process, microstructure, mechanical properties, and joinability. The demonstrator is a stepped plate with a minimum thickness of 2.0 mm and a maximum thickness of 4.0 mm, whereas the thickness difference between neighbour steps amounts to 0.5 mm. During casting trials, the solidification rates for different plate steps were measured. The microscopic investigations reveal a correlation between solidification rates and microstructure parameters such as secondary dendrite arm spacing. Furthermore, mechanical properties and the mechanical joinability are investigated.}}, author = {{Neuser, Moritz and Grydin, Olexandr and Andreiev, Anatolii and Schaper, Mirko}}, issn = {{2075-4701}}, journal = {{Metals}}, title = {{{Effect of Solidification Rates at Sand Casting on the Mechanical Joinability of a Cast Aluminium Alloy}}}, doi = {{10.3390/met11081304}}, year = {{2021}}, } @article{24565, abstract = {{AbstractLaser surface treatment of metals is one option to improve their properties for adhesive bonding. In this paper, a pulsed YVO4 Laser source with a wavelength of 1064 nm and a maximum power of 25 W was utilized to increase the surface area of the steel HCT490X in order to improve its bonding properties with a carbon fibre reinforced polymer (CFRP). Investigated was the influence of the scanning speed of the laser source on the bonding properties. For this purpose, the steel surfaces were ablated at a scanning speed between 1500 and 4500 mm/s. Afterwards the components were bonded with the adhesive HexBond™ 677. After lap shear tests were carried out on the specimen, the surfaces were inspected using scanning electron microscopy (SEM). The experiments revealed that the bonding quality can be improved with a high scanning speed, even when the surface is not completely ablated.}}, author = {{Voswinkel, Dietrich and Kloidt, D. and Grydin, Olexandr and Schaper, Mirko}}, issn = {{0944-6524}}, journal = {{Production Engineering}}, number = {{2}}, pages = {{263--270}}, title = {{{Time efficient laser modification of steel surfaces for advanced bonding in hybrid materials}}}, doi = {{10.1007/s11740-020-01006-2}}, volume = {{15}}, year = {{2021}}, } @article{24566, author = {{Engelkemeier, Katja and Sun, Aijia and Voswinkel, Dietrich and Grydin, Olexandr and Schaper, Mirko and Bremser, Wolfgang}}, issn = {{2196-0216}}, journal = {{ChemElectroChem}}, pages = {{2155--2168}}, publisher = {{Wiley}}, title = {{{Zinc Anodizing: Structural Diversity of Anodic Zinc Oxide Controlled by the Type of Electrolyte}}}, doi = {{10.1002/celc.202100216}}, year = {{2021}}, } @article{23897, author = {{Andreiev, Anatolii and Hoyer, Kay-Peter and Dula, Dimitri and Hengsbach, Florian and Grydin, Olexandr and Frolov, Yaroslav and Schaper, Mirko}}, issn = {{0921-5093}}, journal = {{Materials Science and Engineering: A}}, title = {{{Laser beam melting of functionally graded materials with application-adapted tailoring of magnetic and mechanical performance}}}, doi = {{10.1016/j.msea.2021.141662}}, year = {{2021}}, } @article{23911, author = {{Pramanik, Sudipta and Andreiev, Anatolii and Hoyer, Kay-Peter and Schaper, Mirko}}, issn = {{0142-1123}}, journal = {{International Journal of Fatigue}}, title = {{{Quasi in-situ analysis of fracture path during cyclic loading of double-edged U notched additively manufactured FeCo alloy}}}, doi = {{10.1016/j.ijfatigue.2021.106498}}, year = {{2021}}, } @article{24088, author = {{Pramanik, Sudipta and Tasche, Lennart and Hoyer, Kay-Peter and Schaper, Mirko}}, issn = {{2214-8604}}, journal = {{Additive Manufacturing}}, title = {{{Investigating the microstructure of an additively manufactured FeCo alloy: an electron microscopy study}}}, doi = {{10.1016/j.addma.2021.102087}}, year = {{2021}}, } @article{23803, author = {{Reitz, Alexander and Grydin, Olexandr and Schaper, Mirko}}, journal = {{Materials Data for Smart Forming Technologies}}, location = {{Freiberg}}, title = {{{Characterization of phase transformations during graded thermo- mechanical treatment of steel 22MnB5 by means of optical methods }}}, year = {{2021}}, } @article{37239, author = {{Wallmeier, Nadine}}, journal = {{Kreis Höxter Jahrbuch}}, pages = {{202--207}}, title = {{{Plattdeutsch im Kreis Höxter. "Der Dialektatlas Mittleres Westdeutschland (DMW)" und die Frage "Wie klingt Plattdeutsch im Kreis Höxter?"}}}, year = {{2021}}, } @book{22515, author = {{Tophinke, Doris and Wallmeier, Nadine and Merten, Marie-Luis}}, publisher = {{Aschendorff Verlag}}, title = {{{Das paderbörnische Platt. Niederdeutsch im Gebiet der Kreise Paderborn und Höxter}}}, year = {{2021}}, } @inproceedings{45449, author = {{Mutschler, Tanja and Buschhüter, David and Schröder, Jan and Riese, Josef and Borowski, Andreas}}, booktitle = {{Naturwissenschaftlicher Unterricht und Lehrerbildung im Umbruch? Gesellschaft für Didaktik der Chemie und Physik. Online Jahrestagung 2020}}, editor = {{Habig, Sebastian}}, pages = {{258--261}}, title = {{{Theoriekonformität von Unterrichtsplanungen im Fach Physik vor und nach dem Praxissemester}}}, volume = {{41}}, year = {{2021}}, } @inproceedings{45461, author = {{Große-Heilmann, Rike Isabel and Riese, Josef}}, booktitle = {{Naturwissenschaftlicher Unterricht und Lehrerbildung im Umbruch? Gesellschaft für Didaktik der Chemie und Physik. Online Jahrestagung 2020. Essen: Universität Duisburg-Essen}}, editor = {{Habig, Sebastian}}, pages = {{441--444}}, title = {{{Erwerb physikdidaktischen Wissens zum Einsatz digitaler Medien im Physikunterricht}}}, volume = {{41}}, year = {{2021}}, } @inproceedings{45460, author = {{Joswig-Käfer, Ann-Kathrin and Riese, Josef}}, booktitle = {{Naturwissenschaftlicher Unterricht und Lehrerbildung im Umbruch? Gesellschaft für Didaktik der Chemie und Physik. Online Jahrestagung 2020. Essen: Universität Duisburg-Essen}}, editor = {{Habig, Sebastian}}, pages = {{286--289}}, title = {{{Längsschnitt Physikdidaktischen Wissens: Ursachen für Veränderungen}}}, volume = {{41}}, year = {{2021}}, } @inproceedings{45463, author = {{Ermel, Dorothee and Riese, Josef}}, booktitle = {{Naturwissenschaftlicher Unterricht und Lehrerbildung im Umbruch? Gesellschaft für Didaktik der Chemie und Physik. Online Jahrestagung 2020. Essen: Universität Duisburg-Essen}}, editor = {{Habig, Sebastian}}, pages = {{585--588}}, title = {{{Praktische technische Kompetenzen im Techniklehramt}}}, volume = {{41}}, year = {{2021}}, } @inproceedings{45462, author = {{Albert, Gerrit and Riese, Josef}}, booktitle = {{Naturwissenschaftlicher Unterricht und Lehrerbildung im Umbruch? Gesellschaft für Didaktik der Chemie und Physik. Online Jahrestagung 2020. Essen: Universität Duisburg-Essen}}, editor = {{Habig, Sebastian}}, pages = {{581--584}}, title = {{{Digitale Kompetenzen im Techniklehramt}}}, volume = {{41}}, year = {{2021}}, } @inproceedings{45450, author = {{Schröder, Jan and Vogelsang, Christoph and Riese, Josef}}, booktitle = {{Naturwissenschaftlicher Unterricht und Lehrerbildung im Umbruch? Gesellschaft für Didaktik der Chemie und Physik. Online Jahrestagung 2020}}, pages = {{266--269}}, title = {{{Entwicklung der Fähigkeit zur Unterrichtsplanung im Fach Physik}}}, volume = {{41}}, year = {{2021}}, } @article{21545, author = {{Masendorf, Lukas and Wächter, Michael and Esderts, Alfons and Otroshi, Mortaza and Meschut, Gerson}}, issn = {{8756-758X}}, journal = {{Fatigue & Fracture of Engineering Materials & Structures}}, pages = {{15}}, title = {{{Service life estimation of self‐piercing riveted joints by linear damage accumulation}}}, doi = {{10.1111/ffe.13446}}, year = {{2021}}, }