@article{29092,
  author       = {{Ju, X. and Mahnken, Rolf and Liang, L. and Xu, Y.}},
  issn         = {{0045-7949}},
  journal      = {{Computers & Structures}},
  title        = {{{Goal-oriented mesh adaptivity for inverse problems in linear micromorphic elasticity}}},
  doi          = {{10.1016/j.compstruc.2021.106671}},
  year         = {{2021}},
}

@article{37413,
  author       = {{Decius, Julian and Schaper, Niclas and Seifert, Andreas}},
  journal      = {{Vocations and Learning}},
  number       = {{2}},
  pages        = {{285--326}},
  title        = {{{Work Characteristics or Workers’ Characteristics? An Input-Process-Output Perspective on Informal Workplace Learning of Blue Collar Workers.}}},
  volume       = {{14}},
  year         = {{2021}},
}

@article{39824,
  author       = {{Seifert, Andreas and Caruso, Carina}},
  journal      = {{PraxisForschungLehrer*innenBildung. Zeitschrift für Schul- und Professionsentwicklung.}},
  number       = {{1}},
  pages        = {{173--187}},
  title        = {{{Bildungswissenschaftliches Wissen und Kompetenzselbsteinschätzungen unter Berücksichtigung individueller Voraussetzungen. Ergebnisse der Befragung angehender Lehrkräfte im Praktikum.}}},
  volume       = {{3}},
  year         = {{2021}},
}

@inproceedings{40299,
  author       = {{Rogge, Tm and Seifert, Andreas}},
  booktitle    = {{DigiGebf21}},
  title        = {{{„Allgemein hat sich die psychische Gesundheit vieler Schüler verschlechtert…” – Belastungserleben als Herausforderung von Abiturientinnen und Abiturienten im digital vermittelten Distanzunterricht.}}},
  year         = {{2021}},
}

@inproceedings{40306,
  author       = {{Watson, Christina and Seifert, Andreas}},
  booktitle    = {{PAEPSY 2021}},
  title        = {{{„Ich weiß die Antwort nicht“ – Ein Mangel an Motivation oder ein Mangel an Wissen?}}},
  year         = {{2021}},
}

@article{37406,
  author       = {{Decius, Julian and Knappstein, Michael and Schaper, Niclas and Seifert, Andreas}},
  issn         = {{1044-8004}},
  journal      = {{Human Resource Development Quarterly}},
  keywords     = {{Organizational Behavior and Human Resource Management, Arts and Humanities (miscellaneous)}},
  publisher    = {{Wiley}},
  title        = {{{Investigating the multidimensionality of informal learning: Validation of a short measure for white‐collar workers}}},
  doi          = {{10.1002/hrdq.21461}},
  year         = {{2021}},
}

@article{37411,
  author       = {{Decius, Julian and Schaper, Niclas and Seifert, Andreas}},
  journal      = {{Academy of Management Prodeedings}},
  number       = {{1}},
  title        = {{{The Hen-Egg-Problem of Informal Workplace Learning & Work Design: The Mediating Role of Job Crafting.}}},
  volume       = {{2021}},
  year         = {{2021}},
}

@article{35326,
  abstract     = {{<jats:p>Thermostable compartmentalized sodium-water sites through intercalated γ-aminopropyl-dimethyl-ethoxy silane in synthetic hectorite.</jats:p>}},
  author       = {{Keil, Waldemar and Zhao, Kai and Oswald, Arthur and Bremser, Wolfgang and Schmidt, Claudia and Hintze-Bruening, Horst}},
  issn         = {{1463-9076}},
  journal      = {{Physical Chemistry Chemical Physics}},
  keywords     = {{Physical and Theoretical Chemistry, General Physics and Astronomy}},
  number       = {{1}},
  pages        = {{477--487}},
  publisher    = {{Royal Society of Chemistry (RSC)}},
  title        = {{{Thermostable water reservoirs in the interlayer space of a sodium hectorite clay through the intercalation of γ-aminopropyl(dimethyl)ethoxysilane in toluene}}},
  doi          = {{10.1039/d1cp03321b}},
  volume       = {{24}},
  year         = {{2021}},
}

@article{34227,
  abstract     = {{In order to reduce the fuel consumption and consequently the greenhouse emissions, the automotive industry is implementing lightweight constructions in the body in white production. As a result, the use of aluminum alloys is continuously increasing. Due to poor weldability of aluminum in combination with other materials, mechanical joining technologies like clinching are increasingly used. In order to predict relevant characteristics of clinched joints and to ensure the reliability of the process, it is simulated numerically during product development processes. In this regard the predictive accuracy of the simulated process highly depends on the implemented friction model. In particular, the frictional behavior between the sheet metals affects the geometrical formation of the clinched joint significantly. This paper presents a testing method, which enables to determine the frictional coefficients between sheet metal materials for the simulation of clinching processes. For this purpose, the correlation of interface pressure and the relative velocity between aluminum sheets in clinching processes is investigated using numerical simulation. Furthermore, the developed testing method focuses on the specimen geometry as well as the reproduction of the occurring friction conditions between two sheet metal materials in clinching processes. Based on a methodical approach the test setup is explained and the functionality of the method is proven by experimental tests using sheet metal material EN AW6014.}},
  author       = {{Rossel, Moritz Sebastian and Böhnke, Max and Bielak, Christian Roman and Bobbert, Mathias and Meschut, Gerson}},
  issn         = {{1662-9795}},
  journal      = {{Key Engineering Materials}},
  keywords     = {{Mechanical Engineering, Mechanics of Materials, General Materials Science}},
  pages        = {{81--88}},
  publisher    = {{Trans Tech Publications, Ltd.}},
  title        = {{{Development of a Method for the Identification of Friction Coefficients in Sheet Metal Materials for the Numerical Simulation of Clinching Processes}}},
  doi          = {{10.4028/www.scientific.net/kem.883.81}},
  volume       = {{883}},
  year         = {{2021}},
}

@article{43179,
  abstract     = {{Der Beitrag referiert Ergebnisse studentischer Forschungsprojekte, die sich mit den Folgen der Corona-Pandemie für die berufliche Bildung, für Berufswahl, Berufsvorbereitung und Ausbildung befasst haben. Die Ergebnisse zeigen nicht nur, wie unterschiedlich Berufe und Branchen von der Krise betroffen waren und damit umgegangen sind, sondern geben auch Hinweise auf nötige Weiterentwicklungen zur Verbesserung der Resilienz von Branchen, Berufen, Betrieben und ihrer Ausbildung.}},
  author       = {{Heisler, Dietmar}},
  issn         = {{00059536}},
  journal      = {{Berufsbildung. Zeitschrift für Theorie-Praxis-Dialog}},
  keywords     = {{Pandemie, Distanzlernen, Berufswahl, Ausbildung}},
  publisher    = {{wbv, Eusl}},
  title        = {{{Berufsausbildung in der Corona-Pandemie. Befunde studentischer Forschungsprojekte}}},
  volume       = {{192}},
  year         = {{2021}},
}

@article{43178,
  abstract     = {{Im Fokus steht das Problem der Durchlässigkeit von akademischer und beruflicher Bildung im Kontext aktueller Reformen. Die Erhöhung sozialer Mobilität als Reformziel gerät darin zugunsten der Attraktivitätssteigerung von Bildungsgängen aus dem Blick. Die geringe Durchlässigkeit von Bildungsgängen wird primär als Marketingproblem thematisiert.}},
  author       = {{Heisler, Dietmar}},
  issn         = {{00059536}},
  journal      = {{Berufsbildung. Zeitschrift für Theorie-Praxis-Dialog}},
  keywords     = {{allgemeine Bildung, berufliche BIldung, Durchlässigkeit im Bildungssystem}},
  pages        = {{6 -- 8}},
  publisher    = {{wbv, Eusl}},
  title        = {{{Berufsausbildung zwischen Attraktivitätsverlust und sozialer Ungleichheit  Reformen für mehr Durchlässigkeit zwischen beruflicher und akademischer Bildung}}},
  volume       = {{191}},
  year         = {{2021}},
}

@article{21946,
  abstract     = {{Lithium niobate (LiNbO3), a material frequently used in optical applications, hosts different kinds of polarons that significantly affect many of its physical properties. In this study, a variety of electron polarons, namely free, bound, and bipolarons, are analyzed using first-principles calculations. We perform a full structural optimization based on density-functional theory for selected intrinsic defects with special attention to the role of symmetry-breaking distortions that lower the total energy. The cations hosting the various polarons relax to a different degree, with a larger relaxation corresponding to a larger gap between the defect level and the conduction-band edge. The projected density of states reveals that the polaron states are formerly empty Nb 4d states lowered into the band gap. Optical absorption spectra are derived within the independent-particle approximation, corrected by the GW approximation that yields a wider band gap and by including excitonic effects within the Bethe-Salpeter equation. Comparing the calculated spectra with the density of states, we find that the defect peak observed in the optical absorption stems from transitions between the defect level and a continuum of empty Nb 4d states. Signatures of polarons are further analyzed in the reflectivity and other experimentally measurable optical coefficients.}},
  author       = {{Schmidt, Falko and Kozub, Agnieszka L. and Gerstmann, Uwe and Schmidt, Wolf Gero and Schindlmayr, Arno}},
  issn         = {{2073-4352}},
  journal      = {{Crystals}},
  pages        = {{542}},
  publisher    = {{MDPI}},
  title        = {{{Electron polarons in lithium niobate: Charge localization, lattice deformation, and optical response}}},
  doi          = {{10.3390/cryst11050542}},
  volume       = {{11}},
  year         = {{2021}},
}

@article{21635,
  abstract     = {{<jats:p>Modern forming processes often allow today the efficient production of complex parts. In order to increase the sustainability of forming processes it would be favorable if the forming of workpieces becomes possible using production waste. At the Chair of Forming and Machining Technology of the Paderborn University (LUF) research is presently conducted with the overall goal to produce workpieces directly from secondary aluminum (e.g., powder and chips). Therefore, friction-based forming processes like friction spinning (or cognate processes) are used due to their high efficiency. As a pre-step, the production of semi-finished parts was the subject of accorded research work at the LUF. Therefore, a friction-based hot extrusion process was used for the full recycling or rework of aluminum chips into profiles. Investigations of the recycled semi-finished products show that they are comparable to conventionally produced semi-finished products in terms of dimensional stability and shape accuracy. An analysis of the mechanical properties of hardness and tensile strength shows that a final product with good and homogeneously distributed properties can be produced. Furthermore, significant correlations to the friction spinning process could be found that are useful for the above-mentioned direct part production from secondary aluminum.</jats:p>}},
  author       = {{Borgert, Thomas and Homberg, Werner}},
  issn         = {{2075-4701}},
  journal      = {{Metals}},
  title        = {{{Friction-Induced Recycling Process for User-Specific Semi-Finished Product Production}}},
  doi          = {{10.3390/met11040663}},
  year         = {{2021}},
}

@inproceedings{23746,
  author       = {{Moritzer, Elmar and Flachmann, Felix}},
  booktitle    = {{SPE ANTEC 2021: The Annual Technical Conference for Plastic Professionals}},
  isbn         = {{978-1-7138-3075-7}},
  location     = {{Online}},
  pages        = {{536--540}},
  title        = {{{Influence of Chemical Blowing Agents on the Filling Behavior of Wood-Plastic-Composite Melts}}},
  year         = {{2021}},
}

@article{23789,
  author       = {{Bolenz, Lukas and Ehlert, Thomas and Dechert, Christopher and Bertling, René and Kenig, Eugeny}},
  issn         = {{0263-8762}},
  journal      = {{Chemical Engineering Research and Design}},
  pages        = {{99--108}},
  title        = {{{Modelling of a continuous distillation process with finite reflux ratio using the hydrodynamic analogy approach}}},
  doi          = {{10.1016/j.cherd.2021.05.025}},
  year         = {{2021}},
}

@inproceedings{34222,
  abstract     = {{Driven by the CO2-emission law by the European government and the increasing costs for raw materials as well as energy, the automotive industry is increasingly using multi-material constructions. This leads to a continuous increase in the use of mechanical joining techniques and especially the self-piercing riveting is of particular importance. The reason for this is the wide range of joining possibilities as well as the high load-bearing capacities of the joints. To be able to react to changing boundary conditions, like material thickness or strength variation of the sheets, research work is crucial with regard to the increase of versatility. In this paper, a numerical study of the influences on the selfpiercing riveting process is presented. For this purpose, the influence of different process parameters such as rivet length and die depth on various quality-relevant characteristics were investigated. With the help of the design of experiment, significant influences were determined and interactions between the individual parameters are shown.}},
  author       = {{Kappe, Fabian and Bielak, Christian Roman and Sartisson, Vadim and Bobbert, Mathias and Meschut, Gerson}},
  booktitle    = {{ESAFORM 2021}},
  publisher    = {{University of Liege}},
  title        = {{{Influence of rivet length on joint formation on self-piercing riveting process considering further process parameters}}},
  doi          = {{10.25518/esaform21.4277}},
  year         = {{2021}},
}

@inproceedings{30675,
  abstract     = {{<jats:p>In many areas of product manufacturing constructions consist of individual components and metal sheets that are joined together to form complex structures. A simple and industrial common method for joining dissimilar and coated materials is clinching. During the joining process and due to the service load cracks can occur in the area of the joint, propagate due to cyclic loading and consequently lead to structural failure. For the prevention of these damage cases, first of all knowledge about the fracture mechanical material parameters regarding the original material state of the sheet metals used within the clinching process are essential.Within the scope of this paper experimental and numerical preliminary investigations regarding the fracture mechanical behavior of sheet metals used within the clinching process are presented. Due to the low thickness of 1.5 mm of the material sheets, the development of a new specimen is necessary to determine the crack growth rate curve including the fracture mechanical parameters like the threshold against crack growth ΔK<jats:sub>I,th</jats:sub> and the fracture toughness K<jats:sub>IC</jats:sub> of the base material HCT590X. For the experimental determination of the crack growth rate curve the numerical calculation of the geometry factor function as well as the calibration function of this special specimen are essential. After the experimental validation of the numerically determined calibration function, crack growth rate curves are determined for the stress ratios <jats:italic>R</jats:italic> = 0.1 and <jats:italic>R</jats:italic> = 0.3 to examine the mean stress sensitivity. In addition, the different rolling directions of 0° and 90° in relation to the initial crack are taken into account in order to investigate the influence of the anisotropy due to rolling.</jats:p>}},
  author       = {{Weiß, Deborah and Schramm, Britta and Kullmer, Gunter}},
  booktitle    = {{Key Engineering Materials}},
  issn         = {{1662-9795}},
  keywords     = {{Mechanical Engineering, Mechanics of Materials, General Materials Science}},
  location     = {{online}},
  pages        = {{127--132}},
  publisher    = {{Trans Tech Publications, Ltd.}},
  title        = {{{Numerical and Experimental Fracture Mechanical Investigations of Clinchable Sheet Metals Made of HCT590X}}},
  doi          = {{10.4028/www.scientific.net/kem.883.127}},
  volume       = {{883}},
  year         = {{2021}},
}

@article{30674,
  abstract     = {{<jats:title>Abstract</jats:title><jats:p>In addition to the classical strength calculation, it is important to design components with regard to fracture mechanics because defects and cracks in a component can drastically influence its strength or fatigue behavior. Cracks can propagate due to operational loads and consequently lead to component failure. The fracture mechanical analysis provides information on stable or unstable crack growth as well as about the direction and the growth rate of a crack. For this purpose, sufficient information has to be available about the crack location, the crack length, the component geometry, the component loading and the fracture mechanical material parameters. The fracture mechanical properties are determined experimentally with standardized specimens as defined by the guidelines of the American Society for Testing and Materials. In practice, however, especially in the context with damage cases or formed material fracture mechanical parameters directly for a component are of interest. However, standard specimens often cannot be extracted at all due to the complexity of the component geometry. Therefore, the development of special specimens is required whereby certain arrangements have to be made in advance. These arrangements are presented in the present paper in order to contribute to a holistic investigation chain for the experimental determination of fracture mechanical material parameters with special specimens.</jats:p>}},
  author       = {{Weiß, Deborah and Schramm, Britta and Kullmer, Gunter}},
  issn         = {{0944-6524}},
  journal      = {{Production Engineering}},
  keywords     = {{Industrial and Manufacturing Engineering, Mechanical Engineering}},
  publisher    = {{Springer Science and Business Media LLC}},
  title        = {{{Holistic investigation chain for the experimental determination of fracture mechanical material parameters with special specimens}}},
  doi          = {{10.1007/s11740-021-01096-6}},
  year         = {{2021}},
}

@article{25894,
  abstract     = {{Powder X-ray diffraction (XRD) patterns of ordered mesoporous CMK-8 and CMK-9 carbon materials are simulated by geometric modeling. The materials are amorphous at the atomic length scale but exhibit highly symmetric gyroidal structures at the nanometer scale, corresponding to regular, continuous nanopore systems with cubic symmetry. Their structures lead to characteristic low-angle XRD signatures. We introduce a model based on geometrical considerations to simulate CMK-8 and CMK-9 structures with variable volume fraction of carbon (vs. pore volume, i.e., variable 'pore wall thickness'). In addition, we also simulate carbon materials with variable amounts of guest species (e.g., sulfur) residing in their pores. The corresponding XRD patterns are calculated. The carbon volume fraction turns out to have a significant impact on the relative diffraction peak intensities, especially in case of CMK-9 carbon that features a bimodal porosity. Likewise, the presence of guest species in the pores may also strongly affect the relative peak intensities. Our study suggests that careful evaluation of experimental low-angle XRD patterns of (real) CMK-8 or CMK-9 materials offers an opportunity to obtain detailed information about the nanostructural properties in addition to the mere identification of the pore systems geometry.}},
  author       = {{Schwind, Bertram and Smått, Jan-Henrik and Tiemann, Michael and Weinberger, Christian}},
  issn         = {{1387-1811}},
  journal      = {{Microporous and Mesoporous Materials}},
  title        = {{{Modeling of gyroidal mesoporous CMK-8 and CMK-9 carbon nanostructures and their X-Ray diffraction patterns}}},
  doi          = {{10.1016/j.micromeso.2020.110330}},
  year         = {{2021}},
}

@article{25897,
  abstract     = {{A comparison of infrared spectroscopic analytical approaches was made in order to assess their applicability for internal structure characterization of SiO2 thin films. Markers for porosity and/or disorder based on the analysis of the asymmetric stretching absorption band of SiO2 between 900−1350 cm−1 were discussed. The shape of this band, which shows a well-defined LO–TO splitting, depends not only on the inherent characteristics of the film under analysis but also on the particular geometry of the IR experiment and the specific surface selection rules of the substrate. Three types of SiO2 thin films with clearly defined porosity ranging from dense films to mesoporous films were investigated by transmission (at different incidence angles), direct specular reflection (at different angles), and diffuse reflection. Two different types of substrate, metallic and semiconducting, were used. The combined effect of substrate and specific technique in the final shape of the band, was discussed, and the efficacy for their applicability to the determination of porosity in thin SiO2 films was critically evaluated.}},
  author       = {{de los Arcos, Teresa and Müller, Hendrik and Wang, Fuzeng and Damerla, Varun Raj and Hoppe, Christian and Weinberger, Christian and Tiemann, Michael and Grundmeier, Guido}},
  issn         = {{0924-2031}},
  journal      = {{Vibrational Spectroscopy}},
  title        = {{{Review of infrared spectroscopy techniques for the determination of internal structure in thin SiO2 films}}},
  doi          = {{10.1016/j.vibspec.2021.103256}},
  year         = {{2021}},
}