@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}},
}
@article{43493,
abstract = {{We consider a measure given as the continuum limit of a one-dimensional Ising model with long-range translationally invariant interactions. Mathematically, the measure can be described by a self-interacting Poisson driven jump process. We prove a correlation inequality, estimating the magnetic susceptibility of this model, which holds for small norm of the interaction function. The bound on the magnetic susceptibility has applications in quantum field theory and can be used to prove existence of ground states for the spin boson model.}},
author = {{Hasler, David and Hinrichs, Benjamin and Siebert, Oliver}},
issn = {{0304-4149}},
journal = {{Stochastic Processes and their Applications}},
pages = {{60--79}},
publisher = {{Elsevier BV}},
title = {{{Correlation bound for a one-dimensional continuous long-range Ising model}}},
doi = {{10.1016/j.spa.2021.12.010}},
volume = {{146}},
year = {{2021}},
}
@inproceedings{26406,
author = {{Schubert, Philipp and Hermann, Ben and Bodden, Eric and Leer, Richard}},
booktitle = {{SCAM '21: IEEE International Working Conference on Source Code Analysis and Manipulation (Engineering Track)}},
title = {{{Into the Woods: Experiences from Building a Dataflow Analysis Framework for C/C++}}},
year = {{2021}},
}
@inproceedings{26405,
author = {{Schubert, Philipp and Sattler, Florian and Schiebel, Fabian and Hermann, Ben and Bodden, Eric}},
booktitle = {{2021 IEEE 21st International Working Conference on Source Code Analysis and Manipulation (SCAM)}},
title = {{{Modeling the Effects of Global Variables in Data-Flow Analysis for C/C++}}},
year = {{2021}},
}
@inproceedings{29203,
abstract = {{We present a monolithically integrated electronic-photonic Mach-Zehnder modulator with a linear, segmented driver on the same silicon substrate. As metric for the modulation efficiency, the external V$\pi$ is hereby reduced to only 420 mV.}},
author = {{Kress, Christian and Singh, Karanveer and Schwabe, Tobias and Preußler, Stefan and Schneider, Thomas and Scheytt, J. Christoph}},
booktitle = {{OSA Advanced Photonics Congress 2021}},
keywords = {{Analog to digital converters, Extinction ratios, Grating couplers, Modulation, Modulators, Phase shift}},
pages = {{IW1B.1}},
publisher = {{Optical Society of America}},
title = {{{High Modulation Efficiency Segmented Mach-Zehnder Modulator Monolithically Integrated with Linear Driver in 0.25 \textmum BiCMOS Technology}}},
doi = {{10.1364/IPRSN.2021.IW1B.1}},
year = {{2021}},
}
@article{29204,
abstract = {{An analysis of an optical Nyquist pulse synthesizer using Mach-Zehnder modulators is presented. The analysis allows to predict the upper limit of the effective number of bits of this type of photonic digital-to-analog converter. The analytical solution has been verified by means of electro-optic simulations. With this analysis the limiting factor for certain scenarios: relative intensity noise, distortions by driving the Mach-Zehnder modulator, or the signal generator phase noise can quickly be identified.}},
author = {{Kress, Christian and Bahmanian, Meysam and Schwabe, Tobias and Scheytt, J. Christoph}},
journal = {{Opt. Express}},
keywords = {{Analog to digital converters, Diode lasers, Laser sources, Phase noise, Signal processing, Wavelength division multiplexers}},
number = {{15}},
pages = {{23671–23681}},
publisher = {{OSA}},
title = {{{Analysis of the effects of jitter, relative intensity noise, and nonlinearity on a photonic digital-to-analog converter based on optical Nyquist pulse synthesis}}},
doi = {{10.1364/OE.427424}},
volume = {{29}},
year = {{2021}},
}
@phdthesis{45670,
author = {{ Fanasch, Patrizia}},
title = {{{Governance and Reputation in the Market for Experience Goods}}},
year = {{2021}},
}
@article{34822,
abstract = {{The role of domain-specific content knowledge is discussed controversially for the early childhood context. Therefore, this review aims at untangling the research on domain-specific content knowledge for early childhood educators by systematically reviewing the conceptual and operational definition of and results on early childhood educators' content knowledge in different domains. Using the scientific databases ERIC, PsycInfo and Web of Sciences, we identified 36 studies on early childhood educators' domain-specific content knowledge. By comparing these studies, we found that conceptualizations of early childhood educators' content knowledge move on a continuum between a scientific related perspective and a practice related perspective. The scientific related perspective defines content knowledge as the knowledge of key concepts, facts and rules of the domain integrating knowledge taught in primary, secondary or upper secondary school. The practice related perspective includes knowledge of key concepts, facts and rules of the domain limited to the knowledge explicitly relevant for teaching in early childhood education as well as selected domain-specific knowledge of children and teaching. Our review shows that the results and implications drawn by the study authors depend on how these authors conceptualize early childhood educators' content knowledge on this continuum. Further research, therefore, needs to consider carefully how early childhood educators' content knowledge is conceptualized. The paper further discusses gaps in this research field, such as validating methods for measuring early childhood educators' content knowledge or implementing more rigorous experimental designs to examine effects of early childhood educators' content knowledge.}},
author = {{Bruns, Julia and Gasteiger, Hedwig and Strahl, Carolin}},
issn = {{2049-6613}},
journal = {{Review of Education}},
keywords = {{content knowledge, domain-specific learning, early childhood education, teacher knowledge}},
number = {{2}},
pages = {{500--538}},
publisher = {{Wiley}},
title = {{{Conceptualising and measuring domain-specific content knowledge of early childhood educators: A systematic review}}},
doi = {{10.1002/rev3.3255}},
volume = {{9}},
year = {{2021}},
}
@article{45687,
author = {{Bruns, Julia and Schopferer, T.}},
journal = {{. TPS – Theorie und Praxis der Sozialpädagogik}},
pages = {{28--32}},
title = {{{Eine mustergültige Wissenschaft}}},
volume = {{11}},
year = {{2021}},
}
@inproceedings{36527,
author = {{Jensen, Solveig and Gasteiger, Hedwig and Bruns, Julia}},
booktitle = {{Proceedings of the 44th Conference of the International Group for the Psychology of Mathematics Education}},
editor = {{Inprasitha, Maitree and Changsri, Narumon and Boonsena, Nisakorn}},
location = {{Khon Kaen, Thailand}},
pages = {{101--109}},
title = {{{Place value and regrouping as seperate constructs of place value understanding}}},
volume = {{3}},
year = {{2021}},
}
@article{34823,
author = {{Bruns, Julia and Gasteiger, Hedwig and Strahl, Carolin}},
issn = {{2049-6613}},
journal = {{Review of Education}},
number = {{2}},
pages = {{539--540}},
publisher = {{Wiley}},
title = {{{Context and Implications Document for: Conceptualising and measuring domain-specific content knowledge of early childhood educators: A systematic review}}},
doi = {{10.1002/rev3.3256}},
volume = {{9}},
year = {{2021}},
}
@inproceedings{36536,
author = {{Jensen, Solveig and Gasteiger, Hedwig and Bruns, Julia}},
booktitle = {{Beiträge zum Mathematikunterricht 2021}},
location = {{Lüneburg}},
publisher = {{WTM-Verlag}},
title = {{{Stellenwertverständnis: Verständnis von Stellenwertprinzip und Bündelungsprinzip als separate Konstrukte}}},
doi = {{http://dx.doi.org/10.17877/DE290R-22292}},
year = {{2021}},
}
@article{45342,
author = {{Schönherr, Johanna and Blomberg, J. and Schukajlow, S. and Leopold, C.}},
journal = {{Contemporary Educational Psychology}},
title = {{{Do emotions and prior performance facilitate the use of the learner-generated drawing strategy? Effects of enjoyment, anxiety, and intramathematical performance on the use of the drawing strategy and modelling performance}}},
doi = {{10.1016/j.cedpsych.2021.101967}},
volume = {{65}},
year = {{2021}},
}
@article{45333,
author = {{Schönherr, Johanna and Schukajlow, S. and Blomberg, J. and Leopold, C.}},
journal = {{Mathematical Thinking and Learning}},
title = {{{Does strategic knowledge matter? Effects of strategic knowledge about drawing on students’ modeling competencies in the domain of geometry}}},
doi = {{10.1080/10986065.2021.2012741}},
year = {{2021}},
}
@article{45343,
author = {{Schönherr, Johanna and Schukajlow, S. and Blomberg, J. and Leopold, C.}},
journal = {{Learning and Instruction}},
title = {{{The role of strategy-based motivation in mathematical problem solving: The case of learner-generated drawings}}},
doi = {{10.1016/j.learninstruc.2021.101561}},
volume = {{80}},
year = {{2021}},
}
@article{45335,
author = {{Schönherr, Johanna and Schukajlow, S. and Blomberg, J.}},
journal = {{mathematik lehren}},
pages = {{22–27}},
title = {{{Was ist eine gute Skizze? Strategiewissen beim mathematischen Modellieren im Bereich der Geometrie fördern}}},
volume = {{224}},
year = {{2021}},
}
@inbook{45352,
author = {{Herding, Jana and Büker, P. and Kamin, A.M. and Glawe, K. and Oevel, Gudrun and Knurr, M. and Menke, I. and Ogrodowski, J. and Schaper, F.}},
booktitle = {{Bildung in der digitalen Transformation}},
editor = {{Wollersheim, Hans Werner and Pengel, Norbert}},
pages = {{231--234}},
publisher = {{Waxmann}},
title = {{{inklud.nrw – eine fallbasierte Lehr-/Lernumgebung zum Erwerb inklusions- und digitalisierungsbezogener Kompetenzen in der Lehrer:innenbildung}}},
year = {{2021}},
}
@inbook{45355,
author = {{Herding, Jana and Ogrodowski, J.}},
booktitle = {{Mythen, Widersprüche und Gewissheiten der Grundschulforschung. Eine wissenschaftliche Bestandsaufnahme nach 100 Jahren Grundschule. Jahrbuch Grundschulforschung}},
editor = {{Böhme, N.}},
pages = {{133--138}},
publisher = {{Springer Verlag}},
title = {{{Mit Kindern den Übergang auf die weiterführende Schule reflektieren – Sichtweisen von Viertklässler*innen auf die selektiven Schulstrukturen}}},
volume = {{25}},
year = {{2021}},
}
@article{45353,
author = {{Herding, Jana and Höke, J. and Büker, P. and Ogrodowski, J.}},
journal = {{Diskurs Kindheits- und Jugendforschung/Discourse. Journal of Childhood and Adolescence Research}},
number = {{3}},
title = {{{Paderborner Qualitätsstern (PQ³) zur Einschätzung der Kooperation im Übergang Kita – Grundschule: ein Selbstevaluationsinstrument für multiprofessionelle und institutionsübergreifende Zusammenarbeit}}},
volume = {{16}},
year = {{2021}},
}
@inbook{45354,
author = {{Herding, Jana and Büker, P. and Höke, J. and Ogrodowski, J.}},
booktitle = {{Evaluation Transition to School Programms: Learning from Research and Practice}},
editor = {{Dockett, Sue and Perry, Bob}},
pages = {{52--63}},
publisher = {{Routledge}},
title = {{{Paderborner Qualitätsstern (PQ³): Self-evaluation of transition to school programms for educators and teachers}}},
year = {{2021}},
}
@misc{45358,
author = {{Herding, Jana}},
title = {{{KrafT Bildungsdokumentation: Kind- und ressourcenorientierte, analysebasierte, fortschrittsorientierte Bildungsbegleitung im Team planen, dokumentieren und reflektieren. Herausgegeben von: Büker, Petra; Ogrodowski, Jana, und Antenbrink, Teresa}}},
year = {{2021}},
}
@inproceedings{45326,
author = {{Mattei, Annalisa and Eremin, Oxana}},
booktitle = {{Bericht zur Jahrestagung der Sektion Frauen- und Geschlechterforschung in der Erziehungswissenschaft in der Deutschen Gesellschaft für Erziehungswissenschaft}},
location = {{Europa-Universität Flensburg }},
pages = {{87--89}},
title = {{{Corona und Krise. Perspektiven erziehungswissenschaftlicher Frauen- und Geschlechterforschung}}},
year = {{2021}},
}
@misc{45328,
author = {{Mattei, Annalisa}},
booktitle = {{Jahrbuch Erziehungswissenschaftliche Geschlechterforschung 17, Opladen / Berlin / Toronto}},
pages = {{242--244}},
title = {{{Rezension zu: Nef, Susanne: Ringen um Bedeutung. Die Deutung häuslicher Gewalt als sozialer Prozess, Basel 2020, in: Fegter, Susann / Langer, Antje / Thon, Christine (Hgg.): Diskursanalytische Geschlechterforschung in der Erziehungswissenschaft}}},
year = {{2021}},
}
@techreport{45327,
author = {{Mattei, Annalisa and Eremin, Oxana}},
pages = {{188--189}},
title = {{{Jahrestagung „Corona und Krise – Perspektiven erziehungswissenschaftlicher Frauen- und Geschlechterforschung“ Erziehungswissenschaft Heft 63, Jg. 32|2021}}},
year = {{2021}},
}
@inbook{45319,
author = {{Schemmer, Susanne Jutta and Heisler, Dietmar and Rink, Julia}},
booktitle = {{Entwicklungen und Perspektiven in der Berufsorientierung. Stand und Herausforderungen. Online: (06.12.2021)}},
editor = {{Weyland, Ulrike and Ziegler, Birgit and Driesel-Lange, Katja and Kruse, Annika}},
pages = {{60--78}},
publisher = {{Verlag Barbara Budrich}},
title = {{{Entwicklungschance oder Warteschleife? Berufsorientierung und Berufswahl in der Berufsfachschule}}},
year = {{2021}},
}
@article{45698,
author = {{Aghaei Abrandabadi, Seyed Ali and Marx, Michael}},
journal = {{Journal of Iranian National Museum, 2}},
pages = {{205--226}},
title = {{{Carbon Dating of Seven Parchment Qurʾān Manuscripts and One Syriac Bible of the National Museum of Iran}}},
year = {{2021}},
}
@inbook{45706,
author = {{Saad, Nadia}},
booktitle = {{Erlanger Jahrbuch für Interreligiöse Diskurse. Methoden der Darstellung und Analyse interreligiöser Diskurse}},
pages = {{354--355}},
publisher = {{Ergon Verlag}},
title = {{{David und Salomon im Koran: ein Komparativ-theologischer Ansatz}}},
year = {{2021}},
}
@article{30372,
author = {{Zahera, H.M.A and Jalota, Rricha and Sherif, Mohamed Ahmed and Ngomo, Axel-Cyrille Ngonga}},
issn = {{2169-3536}},
journal = {{IEEE Access}},
keywords = {{General Engineering, General Materials Science, General Computer Science}},
pages = {{118861--118870}},
publisher = {{Institute of Electrical and Electronics Engineers (IEEE)}},
title = {{{I-AID: Identifying Actionable Information From Disaster-Related Tweets}}},
doi = {{10.1109/access.2021.3107812}},
volume = {{9}},
year = {{2021}},
}
@inproceedings{30374,
author = {{Zahera, H.M.A and Heindorf, Stefan and Ngomo, Axel-Cyrille Ngonga}},
booktitle = {{Proceedings of the 11th on Knowledge Capture Conference}},
publisher = {{ACM}},
title = {{{ASSET: A Semi-supervised Approach for Entity Typing in Knowledge Graphs}}},
doi = {{10.1145/3460210.3493563}},
year = {{2021}},
}
@phdthesis{24884,
author = {{Szopinski, Daniel}},
title = {{{Essays on Modeling Languages and Software Tools for Business Model Innovation: Theory and Empirical Evidence}}},
doi = {{10.17619/UNIPB/1-1647 }},
year = {{2021}},
}
@inproceedings{45840,
abstract = {{Argumentation is a widely applied framework for modeling and evaluating arguments and its reasoning with various applications. Popular frameworks are abstract argumentation (Dung’s framework) or logic-based argumentation (Besnard-Hunter’s framework). Their computational complexity has been studied quite in-depth. Incorporating treewidth into the complexity analysis is particularly interesting, as solvers oftentimes employ SAT-based solvers, which can solve instances of low treewidth fast. In this paper, we address whether one can design reductions from argumentation problems to SAT-problems while linearly preserving the treewidth, which results in decomposition-guided (DG) reductions. It turns out that the linear treewidth overhead caused by our DG reductions, cannot be significantly improved under reasonable assumptions. Finally, we consider logic-based argumentation and establish new upper bounds using DG reductions and lower bounds.}},
author = {{Fichte, Johannes and Hecher, Markus and Mahmood, Yasir and Meier, Arne}},
booktitle = {{Proceedings of the Thirtieth International Joint Conference on Artificial Intelligence}},
publisher = {{International Joint Conferences on Artificial Intelligence Organization}},
title = {{{Decomposition-Guided Reductions for Argumentation and Treewidth}}},
doi = {{10.24963/ijcai.2021/259}},
year = {{2021}},
}
@article{45849,
abstract = {{AbstractDependence Logic was introduced by Jouko Väänänen in 2007. We study a propositional variant of this logic(PDL)and investigate a variety of parameterisations with respect to central decision problems. The model checking problem (MC) ofPDLisNP-complete (Ebbing and Lohmann, SOFSEM 2012). The subject of this research is to identify a list of parameterisations (formula-size, formula-depth, treewidth, team-size, number of variables) under which MC becomes fixed-parameter tractable. Furthermore, we show that the number of disjunctions or the arity of dependence atoms (dep-arity) as a parameter both yield a paraNP-completeness result. Then, we consider the satisfiability problem (SAT) which classically is known to beNP-complete as well (Lohmann and Vollmer, Studia Logica 2013). There we are presenting a different picture: under team-size, or dep-arity SAT isparaNP-complete whereas under all other mentioned parameters the problem isFPT. Finally, we introduce a variant of the satisfiability problem, asking for a team of a given size, and show for this problem an almost complete picture.}},
author = {{Mahmood, Yasir and Meier, Arne}},
issn = {{1012-2443}},
journal = {{Annals of Mathematics and Artificial Intelligence}},
keywords = {{Applied Mathematics, Artificial Intelligence}},
number = {{2-3}},
pages = {{271--296}},
publisher = {{Springer Science and Business Media LLC}},
title = {{{Parameterised complexity of model checking and satisfiability in propositional dependence logic}}},
doi = {{10.1007/s10472-021-09730-w}},
volume = {{90}},
year = {{2021}},
}
@inproceedings{45846,
author = {{Kontinen, Juha and Meier, Arne and Mahmood, Yasir}},
booktitle = {{Logical Foundations of Computer Science}},
isbn = {{9783030930998}},
issn = {{0302-9743}},
publisher = {{Springer International Publishing}},
title = {{{A Parameterized View on the Complexity of Dependence Logic}}},
doi = {{10.1007/978-3-030-93100-1_9}},
year = {{2021}},
}