@inproceedings{20807,
author = {{Bielak, Christian Roman and Böhnke, Max and Bobbert, Mathias and Meschut, Gerson}},
location = {{Lüttich}},
title = {{{Further development of a numerical method for analyzing the load capacity of clinched joints in versatile process chains}}},
doi = {{10.25518/esaform21.4298}},
year = {{2021}},
}
@article{30650,
abstract = {{Due to increasingly strict emission targets and regulatory requirements, especially for companies in the transport industry, the demand for multi-material-systems is continuously rising in order to lower energy consumption. In this context, mechanical joining processes offer an environmentally friendly and flexible alternative to established joining methods, especially in the field of lightweight design. For example, cold-formed cylindrical pin structures show high potentials in joining multi-material-systems without auxiliary elements. The pin structures are joined either by pressing them directly into the joining partner or by caulking with a pre-punched part. However, to evaluate the strength of the joint and to ensure the joining reliability for versatile processes, such as changing joining partners or batch variations, engineering designers currently have only limited design principles available compared to thermal joining processes. Consequently, the design of an optimal pin joint requires cost- and time-intensive experimental investigations and adjustments to design or process parameters. As a solution, data-driven methods offer procedures for structuring data and identifying dependencies between varying process parameters and resulting pin structure characteristics. Motivated by this, the paper presents an approach for the data-driven analysis of cold-formed pin structures and offers a deeper understanding of how versatile processes affect the pin characteristics. Therefore, the application of an intelligent design of experiment in combination with several machine learning methods enable the setup of a best-fitting meta-model. Resulting, the determination of a mathematical model provides the opportunity to accurately estimate the pin height considering only relevant geometrical and process parameters with a prediction quality of 95 %.}},
author = {{Römisch, D. and Zirngibl, C. and Schleich, B. and Wartzack, S. and Merklein, M.}},
journal = {{IOP Conference Series: Materials Science and Engineering}},
pages = {{012077}},
title = {{{Data-driven analysis of cold-formed pin structure characteristics in the context of versatile joining processes}}},
doi = {{10.1088/1757-899X/1157/1/012077}},
volume = {{1157}},
year = {{2021}},
}
@article{30648,
abstract = {{In clinching, the combinations of requirements, materials, component dimensions and tools influence the resulting joint geometry and the resulting bonding mechanisms. These in turn affect the property profile of the joint. For example, it is possible to use different tools to flexibly adapt clinching points to the respective required load regime. Clinching points dimensioned in this way can be geometrically similar, but have different mechanical stress states, which leads to different properties in terms of load-bearing behavior. Within the scope of this work, the clinching process with different tools in optimal and compromise design and its effect on the force and form-closure component, is investigated in a torsion test of the clinched connection. Clinched steel sheets with two thicknesses and joining directions are analyzed. Virtual experiments are carried out using finite element analyses (FEA) of the joining process and are followed by a springback simulation. Subsequently, the surface pressure between the two joining partners in the clinching points is calculated on the basis of the results from the FEA and the transmittable moment of the connection, as an indicator for the force-closure component, is determined. Finally, the experimental and simulated data are compared and discussed.}},
author = {{Steinfelder, C. and Kalich, J. and Brosius, A. and Füssel, U.}},
journal = {{IOP Conference Series: Materials Science and Engineering}},
pages = {{012003}},
title = {{{Numerical and experimental investigation of the transmission moment of clinching points}}},
doi = {{10.1088/1757-899x/1157/1/012003}},
volume = {{1157}},
year = {{2021}},
}
@article{30653,
abstract = {{Continuous Fiber Reinforced Thermoplastic (CFRT) hybrid parts offer interesting possibilities for lightweight application, which can exceed the capabilities of mono material metal or CFRT parts. In this case, the joining technology oftentimes is the limiting factor. This study investigates a joining operation with metal pin structures which are additively manufactured via powder bed fusion featuring different diameters and tip geometries, which are inserted into the locally infrared heated CFRT part. The resulting fiber rearrangement is assessed using transmitted light microscopy, confocal laser scanning microscopy as well as micro-computer-tomography. It could be shown that for all assessed pin variants a similar distinct fiber displacement can be seen and that the pin diameter has a significant effect on the resulting fiber orientation with smaller pin diameters being advantageous because of gentle fiber displacement and reduced undulation. The tip geometry has only minor effect on the fiber orientation. Especially in the X/Y plane no systematic influence of the tip geometry on the fiber displacement could be observed. Based on the gained insights a three-stage model of the fiber orientation processes is proposed.}},
author = {{Popp, J. and Kleffel, T. and Römisch, D. and Papke, T. and Merklein, M. and Drummer, D.}},
journal = {{Applied Composite Materials}},
pages = {{951–972}},
title = {{{Fiber Orientation Mechanism of Continuous Fiber Reinforced Thermoplastics Hybrid Parts Joined with Metallic Pins}}},
doi = {{10.1007/s10443-021-09892-0}},
volume = {{28}},
year = {{2021}},
}
@article{30652,
abstract = {{Clinching continuous fibre reinforced thermoplastic composites and metals is challenging due to the low ductility of the composite material. Therefore, a number of novel clinching technologies has been developed specifically for these material combinations. A systematic overview of these advanced clinching methods is given in the present paper. With a focus on process design, three selected clinching methods suitable for different joining tasks are described in detail. The clinching processes including equipment and tools, observed process phenomena and the resultant material structure are compared. Process phenomena during joining are explained in general and compared using computed tomography and micrograph images for each process. In addition the load bearing behaviour and the corresponding failure mechanisms are investigated by means of single-lap shear tests. Finally, the new joining technologies are discussed regarding application relevant criteria.}},
author = {{Gröger, B. and Troschitz, J. and Vorderbrüggen, J. and Vogel, C. and Kupfer, R. and Meschut, G. and Gude, M.}},
journal = {{Materials}},
pages = {{2286}},
title = {{{Clinching of Thermoplastic Composites and Metals—A Comparison of Three Novel Joining Technologies}}},
doi = {{10.3390/ma14092286X}},
volume = {{14}},
year = {{2021}},
}
@article{30662,
abstract = {{Industrial X-ray computed tomography (XCT) is a tool for non-destructive testing and a volumetric analysis method with the ability to measure dimensions and geometry inside a component without destroying it. However, XCT is a relatively young technology in the field of dimensional metrology and thus faces several challenges. The achievement of a high measurement resolution, which is re-quired to detect small geometrical features, depends on a variety of influencing factors. In this arti-cle, the interface structural resolution (ISR) as one of the key challenges will be investigated. The two-sphere standard called the hourglass standard allows the determination of the structural resolu-tion by evaluation of the surrounding area of an ideal point contact of two spheres after the CT re-construction in form of a neck-shaped transition. Close to the contact point of the two spheres two opposing surfaces exist. Their distances from each other increase as the distance from the contact point of the two spheres increase. The determination of the distances between the spheres’ surface allows a statement about the ISR. A new developed specimen or standard with a variable gap size consisting of calibrated parallel gauge blocks allows statements about the ISR, too. Because of the higher number of probing points of the gauge block standard the results of the determined ISR are more stable compared to the hourglass standard. This paper compares the results of the computed tomography measurements for the designed interface structural resolution standard with those of the hourglass standard. }},
author = {{Busch, M. and Hausotte, T.}},
journal = {{Key Engineering Materials}},
pages = {{41--48}},
title = {{{Determination of the Interface Structural Resolution of an Industrial X-Ray Computed Tomograph Using a Spherical Specimen and a Gap Specimen Consisting of Gauge Blocks}}},
doi = {{10.4028/www.scientific.net/kem.883.41}},
volume = {{883}},
year = {{2021}},
}
@inproceedings{30725,
abstract = {{Several algorithms for finding the best arm in the dueling bandits setting assume the existence of a Condorcet winner (CW), that is, an arm that uniformly dominates all other arms. Yet, by simply relying on this assumption but not verifying it, such algorithms may produce doubtful results in cases where it actually fails to hold. Even worse, the problem may not be noticed, and an alleged CW still be produced. In this paper, we therefore address the problem as a ”testification” task, by which we mean a combination of testing and identification: The online identification of the CW is combined with the statistical testing of the CW assumption. Thus, instead of returning a supposed CW at some point, the learner has the possibility to stop sampling and refuse an answer in case it feels confident that the CW assumption is violated. Analyzing the testification problem formally, we derive lower bounds on the expected sample complexity of any online algorithm solving it. Moreover, a concrete algorithm is proposed, which achieves the optimal sample complexity up to logarithmic terms.}},
author = {{Haddenhorst, Björn and Bengs, Viktor and Brandt, Jasmin and Hüllermeier, Eyke}},
booktitle = {{Proceedings of the Thirty-Seventh Conference on Uncertainty in Artificial Intelligence}},
editor = {{de Campos, Cassio and Maathuis, Marloes H.}},
pages = {{1195–1205}},
publisher = {{PMLR}},
title = {{{Testification of Condorcet Winners in dueling bandits}}},
volume = {{161}},
year = {{2021}},
}
@article{30659,
abstract = {{In lightweight design, clinching is a cost-efficient solution as the joint is created through localized cold-forming of the joining parts. A clinch point’s quality is usually assessed using ex-situ destructive testing methods. These, however, are unable to detect phenomena immediately during the joining process. For instance, elastic deformations reverse and cracks close after unloading. In-situ methods such as the force-displacement evaluation are used to control a clinching process, though deviations in the clinch point geometry cannot be derived with this method. To overcome these limitations, the clinching process can be investigated using in-situ computed tomography (in-situ CT). However, a clinching tool made of steel would cause strong artefacts and a high attenuation in the CT measurement, reducing the significance of this method. Additionally, when joining parts of the same material, the sheet-sheet interface is hardly detectable. This work aims at identifying, firstly, tool materials that allow artefact-reduced CT measurements during clinching, and, secondly, radiopaque materials that can be applied between the joining parts to enhance the detectability of the sheet-sheet interface. Therefore, both CT-suitable tool materials and radiopaque materials are selected and experimentally investigated. In the clinching process, two aluminium sheets with radiopaque material in between are clinched in a single-step (rotationally symmetric joint without cut section). It is shown that e.g. silicon nitride is suited as tool material and a tin layer is suitable to enhance the detectability of the sheet-sheet interface. }},
author = {{Köhler, D. and Kupfer, R. and Troschitz, J. and Gude, M.}},
journal = {{ESAFORM 2021}},
title = {{{Clinching in In-situ CT – Experimental Study on Suitable Tool Materials}}},
doi = {{10.25518/esaform21.2781}},
year = {{2021}},
}
@article{30661,
abstract = {{As lightweight design gains more and more attention, time and cost-efficient joining methods such as clinching are becoming more popular. A clinch point’s quality is usually determined by ex situ destructive analyses such as microsectioning. However, these methods do not yield the detection of phenomena occurring during loading such as elastic deformations and cracks that close after unloading. Alternatively, in situ computed tomography (in situ CT) can be used to investigate the loading process of clinch points. In this paper, a method for in situ CT analysis of a single-lap shear test with clinched metal sheets is presented at the example of a clinched joint with two 2 mm thick aluminum sheets. Furthermore, the potential of this method to validate numerical simulations is shown. Since the sheets’ surfaces are locally in contact with each other, the interface between both aluminum sheets and therefore the exact contour of the joining partners is difficult to identify in CT analyses. To compensate for this, the application of copper varnish between the sheets is investigated. The best in situ CT results are achieved with both sheets treated. It showed that with this treatment, in situ CT is suitable to properly observe the three-dimensional deformation behavior and to identify the failure modes.}},
author = {{Köhler, D. and Kupfer, R. and Troschitz, J. and Gude, M.}},
journal = {{Materials}},
pages = {{1859}},
title = {{{In Situ Computed Tomography—Analysis of a Single-Lap Shear Test with Clinch Points}}},
doi = {{10.3390/ma14081859}},
volume = {{14}},
year = {{2021}},
}
@article{30719,
abstract = {{Due to increasing demands regarding ecological and economic specifications in vehicle design, the effort required for production is continuously increasing. One trend is the increased use of multi-material systems, which are characterised by the use of different materials such as high-strength steels or aluminium alloys. In addition to the varying mechanical properties of the components, an increased number of variants accompanied by different geometries is leading to increasing challenges on body construction. For the assembly and connection of the individual components, conventional joining methods reach their limitations. Therefore, new joining methods are necessary, which feature properties of versatility and can adapt to process and disturbance variables. One way of achieving tailored joints is to use a tumbling self-piercing riveting process. For the design of the process route, numerical investigations are necessary for which a characterisation of the friction properties is necessary. This paper therefore investigates the contact and friction conditions that occur in a tumbling self-piercing riveting process. The individual contacts between the process components are identified and based on this, suitable processes for the characterisation of the friction factors - and coefficients are selected and performed.}},
author = {{Wituschek, S. and Lechner, M.}},
journal = {{Key Engineering Materials}},
pages = {{27--34}},
title = {{{Friction Characterisation for a Tumbling Self-Piercing Riveting Process}}},
doi = {{10.4028/www.scientific.net/kem.883.27}},
volume = {{883}},
year = {{2021}},
}
@inproceedings{30723,
author = {{Haddenhorst, Björn and Bengs, Viktor and Hüllermeier, Eyke}},
booktitle = {{Advances in Neural Information Processing Systems}},
editor = {{Beygelzimer, A. and Dauphin, Y. and Liang, P. and Vaughan, J. Wortman}},
title = {{{Identification of the Generalized Condorcet Winner in Multi-dueling Bandits}}},
year = {{2021}},
}
@misc{17751,
author = {{Peckhaus, Volker}},
booktitle = {{Staatslexikon. Recht, Wirtschaft, Gesellschaft, Bd. 5: Schule - Virtuelle Realität}},
pages = {{983--991 (Spalten)}},
publisher = {{Herder Verlag}},
title = {{{Technikphilosophie}}},
year = {{2021}},
}
@unpublished{30792,
abstract = {{Information exchange over networks can be affected by various forms of delay.
This causes challenges for using the network by a multi-agent system to solve a
distributed optimisation problem. Distributed optimisation schemes, however,
typically do not assume network models that are representative for real-world
communication networks, since communication links are most of the time
abstracted as lossless. Our objective is therefore to formulate a
representative network model and provide practically verifiable network
conditions that ensure convergence of distributed algorithms in the presence of
interference and possibly unbounded delay. Our network is modelled by a
sequence of directed-graphs, where to each network link we associate a process
for the instantaneous signal-to-interference-plus-noise ratio. We then
formulate practical conditions that can be verified locally and show that the
age of information (AoI) associated with data communicated over the network is
in $\mathcal{O}(\sqrt{n})$. Under these conditions we show that a penalty-based
gradient descent algorithm can be used to solve a rich class of stochastic,
constrained, distributed optimisation problems. The strength of our result lies
in the bridge between practical verifiable network conditions and an abstract
optimisation theory. We illustrate numerically that our algorithm converges in
an extreme scenario where the average AoI diverges.}},
author = {{Redder, Adrian and Ramaswamy, Arunselvan and Karl, Holger}},
booktitle = {{arXiv:2105.04230}},
title = {{{Practical sufficient conditions for convergence of distributed
optimisation algorithms over communication networks with interference}}},
year = {{2021}},
}
@inproceedings{27381,
abstract = {{Graph neural networks (GNNs) have been successfully applied in many structured data domains, with applications ranging from molecular property prediction to the analysis of social networks. Motivated by the broad applicability of GNNs, we propose the family of so-called RankGNNs, a combination of neural Learning to Rank (LtR) methods and GNNs. RankGNNs are trained with a set of pair-wise preferences between graphs, suggesting that one of them is preferred over the other. One practical application of this problem is drug screening, where an expert wants to find the most promising molecules in a large collection of drug candidates. We empirically demonstrate that our proposed pair-wise RankGNN approach either significantly outperforms or at least matches the ranking performance of the naive point-wise baseline approach, in which the LtR problem is solved via GNN-based graph regression.}},
author = {{Damke, Clemens and Hüllermeier, Eyke}},
booktitle = {{Proceedings of The 24th International Conference on Discovery Science (DS 2021)}},
editor = {{Soares, Carlos and Torgo, Luis}},
isbn = {{9783030889418}},
issn = {{0302-9743}},
keywords = {{Graph-structured data, Graph neural networks, Preference learning, Learning to rank}},
location = {{Halifax, Canada}},
pages = {{166--180}},
publisher = {{Springer}},
title = {{{Ranking Structured Objects with Graph Neural Networks}}},
doi = {{10.1007/978-3-030-88942-5}},
volume = {{12986}},
year = {{2021}},
}
@unpublished{30866,
abstract = {{Automated machine learning (AutoML) strives for the automatic configuration
of machine learning algorithms and their composition into an overall (software)
solution - a machine learning pipeline - tailored to the learning task
(dataset) at hand. Over the last decade, AutoML has developed into an
independent research field with hundreds of contributions. While AutoML offers
many prospects, it is also known to be quite resource-intensive, which is one
of its major points of criticism. The primary cause for a high resource
consumption is that many approaches rely on the (costly) evaluation of many
machine learning pipelines while searching for good candidates. This problem is
amplified in the context of research on AutoML methods, due to large scale
experiments conducted with many datasets and approaches, each of them being run
with several repetitions to rule out random effects. In the spirit of recent
work on Green AI, this paper is written in an attempt to raise the awareness of
AutoML researchers for the problem and to elaborate on possible remedies. To
this end, we identify four categories of actions the community may take towards
more sustainable research on AutoML, i.e. Green AutoML: design of AutoML
systems, benchmarking, transparency and research incentives.}},
author = {{Tornede, Tanja and Tornede, Alexander and Hanselle, Jonas Manuel and Wever, Marcel Dominik and Mohr, Felix and Hüllermeier, Eyke}},
booktitle = {{arXiv:2111.05850}},
title = {{{Towards Green Automated Machine Learning: Status Quo and Future Directions}}},
year = {{2021}},
}
@article{30864,
author = {{Schulz, Andreas and Wecker, Christian and Inguva, Venkatesh and Lopatin, Alexey S. and Kenig, Eugeny Y.}},
issn = {{0009-2509}},
journal = {{Chemical Engineering Science}},
keywords = {{Applied Mathematics, Industrial and Manufacturing Engineering, General Chemical Engineering, General Chemistry}},
publisher = {{Elsevier BV}},
title = {{{A PLIC-based method for species mass transfer at free fluid interfaces}}},
doi = {{10.1016/j.ces.2021.117357}},
volume = {{251}},
year = {{2021}},
}
@phdthesis{27284,
author = {{Wever, Marcel Dominik}},
title = {{{Automated Machine Learning for Multi-Label Classification}}},
doi = {{10.17619/UNIPB/1-1302}},
year = {{2021}},
}
@article{30906,
abstract = {{Abstract
Background
Hand amputation can have a truly debilitating impact on the life of the affected person. A multifunctional myoelectric prosthesis controlled using pattern classification can be used to restore some of the lost motor abilities. However, learning to control an advanced prosthesis can be a challenging task, but virtual and augmented reality (AR) provide means to create an engaging and motivating training.
Methods
In this study, we present a novel training framework that integrates virtual elements within a real scene (AR) while allowing the view from the first-person perspective. The framework was evaluated in 13 able-bodied subjects and a limb-deficient person divided into intervention (IG) and control (CG) groups. The IG received training by performing simulated clothespin task and both groups conducted a pre- and posttest with a real prosthesis. When training with the AR, the subjects received visual feedback on the generated grasping force. The main outcome measure was the number of pins that were successfully transferred within 20 min (task duration), while the number of dropped and broken pins were also registered. The participants were asked to score the difficulty of the real task (posttest), fun-factor and motivation, as well as the utility of the feedback.
Results
The performance (median/interquartile range) consistently increased during the training sessions (4/3 to 22/4). While the results were similar for the two groups in the pretest, the performance improved in the posttest only in IG. In addition, the subjects in IG transferred significantly more pins (28/10.5 versus 14.5/11), and dropped (1/2.5 versus 3.5/2) and broke (5/3.8 versus 14.5/9) significantly fewer pins in the posttest compared to CG. The participants in IG assigned (mean ± std) significantly lower scores to the difficulty compared to CG (5.2 ± 1.9 versus 7.1 ± 0.9), and they highly rated the fun factor (8.7 ± 1.3) and usefulness of feedback (8.5 ± 1.7).
Conclusion
The results demonstrated that the proposed AR system allows for the transfer of skills from the simulated to the real task while providing a positive user experience. The present study demonstrates the effectiveness and flexibility of the proposed AR framework. Importantly, the developed system is open source and available for download and further development.
}},
author = {{Boschmann, Alexander and Neuhaus, Dorothee and Vogt, Sarah and Kaltschmidt, Christian and Platzner, Marco and Dosen, Strahinja}},
issn = {{1743-0003}},
journal = {{Journal of NeuroEngineering and Rehabilitation}},
keywords = {{Health Informatics, Rehabilitation}},
number = {{1}},
publisher = {{Springer Science and Business Media LLC}},
title = {{{Immersive augmented reality system for the training of pattern classification control with a myoelectric prosthesis}}},
doi = {{10.1186/s12984-021-00822-6}},
volume = {{18}},
year = {{2021}},
}
@article{30907,
author = {{Rodriguez, Alfonso and Otero, Andres and Platzner, Marco and De la Torre, Eduardo}},
issn = {{0018-9340}},
journal = {{IEEE Transactions on Computers}},
keywords = {{Computational Theory and Mathematics, Hardware and Architecture, Theoretical Computer Science, Software}},
pages = {{1--1}},
publisher = {{Institute of Electrical and Electronics Engineers (IEEE)}},
title = {{{Exploiting Hardware-Based Data-Parallel and Multithreading Models for Smart Edge Computing in Reconfigurable FPGAs}}},
doi = {{10.1109/tc.2021.3107196}},
year = {{2021}},
}
@article{30924,
abstract = {{Wood fiber reinforcement of plastics is almost limited to polypropylene, polyethylene, polyvinyl chloride and polystyrene. Wood fiber reinforcement of thermoplastic polyurethanes (TPU) is a new research field and paltry studied scientifically. Wood fiber reinforcement can carry out synergistic effects between sustainability, material or product price reduction, improved mechanical properties at high elongation, and brilliant appearance and haptics. In order to evaluate to what extent the improvement of mechanical properties depend on material-specific parameters (fiber type, fiber content) and on process-specific parameters (holding pressure, temperature control and injection speed), differently filled compounds were injection molded according to a partial factorial test plan and subjected to characterizing test procedures (tensile test, Shore hardness and notched impact test). Tensile strength showed significant dependence on barrel temperature, fiber type and interaction between holding pressure and barrel temperature in the region of interest. Young’s modulus can be influenced by fiber content but not by fiber type. Notched impact strength showed a significant influence of cylinder temperature, fiber content, fiber type and the interaction between cylinder temperature and fiber content in the region of interest. Shore hardness is related to fiber content and the interaction between mold temperature and injection flow rate. Our results show not only that wood-filled TPU can be processed very well by injection molding, but also that the mechanical properties depend significantly on temperature control in the injection-molding process. Moreover, considering the significant reinforcing effect of the wood fibers, a good fiber-matrix adhesion can be assumed.}},
author = {{Moritzer, Elmar and Richters, Maximilian}},
issn = {{2504-477X}},
journal = {{Journal of Composites Science}},
keywords = {{Engineering (miscellaneous), Ceramics and Composites}},
number = {{12}},
publisher = {{MDPI AG}},
title = {{{Injection Molding of Wood-Filled Thermoplastic Polyurethane}}},
doi = {{10.3390/jcs5120316}},
volume = {{5}},
year = {{2021}},
}
@article{23944,
author = {{Moritzer, Elmar and Richters, Maximilian}},
journal = {{Journal of Applied Polymer Science}},
publisher = {{Wiley }},
title = {{{Characterization of wood-filled thermoplastic polyurethane for the injection modling process}}},
year = {{2021}},
}
@article{23948,
author = {{Moritzer, Elmar and Richters, Maximilian and Hillemeyer, Johannes and Krassmann, Dimitri}},
journal = {{Joining Plastics}},
title = {{{Mit dem Schraubblind-Durchsetznieten Metallteile mit Composites bei einseitiger Zugänglichkeit verbinden}}},
year = {{2021}},
}
@article{23886,
author = {{Kastein, Mara and Finke, Josefine and Horwath, Ilona}},
issn = {{2196-3886}},
journal = {{Voluntaris}},
pages = {{135--151}},
title = {{{Florian braucht Mehmet mehr als umgekehrt: Herausforderungen und Potenziale für Inklusion in der Freiwilligen Feuerwehr}}},
doi = {{10.5771/2196-3886-2021-1-135}},
year = {{2021}},
}
@misc{24446,
booktitle = {{Erscheinungsformen, Erklärungsversuche und Gegenstrategien, GENDER }},
editor = {{Kastein, Mara and Horwath, Ilona and Finke, Josefine and Duglar Sezer, Nilgün}},
pages = {{92--107}},
title = {{{Ohne den ‚Weissen Mann‘ würden Leute wie Sie noch in Erdhöhlen wohnen.“ - Die Markierung der Unmarkierten}}},
doi = {{doi.org/10.3224/84742528.01}},
year = {{2021}},
}
@inbook{24477,
author = {{Horwath, Ilona and Kastein, Mara and Duglar Sezer, Nilgün}},
booktitle = {{Feuerwehren im Spiegel gesellschaftlicher Diversität}},
editor = {{Duglar Sezer, Nilgün and Horwath, Ilona and Kastein, Mara}},
title = {{{Feuerwehren im Spiegel gesellschaftlicher Diversität}}},
year = {{2021}},
}
@article{24172,
abstract = {{In dem Artikel werden die Metaphern gleichstellungsorientierter Männerpolitik als eine Form diskursiver Praktiken untersucht. In meiner Dissertation habe ich die Metaphernanalyse ergänzend zur Grounded-Theory-Methodologie und zur wissenssoziologischen Diskursanalyse genutzt, um die Ergebnisse zu verdichten und zu vertiefen. Dabei stellt die Metaphorik der gleichstellungsorientierten Männerpolitik selbige als instabil, schwankend, balancierend und uneinig dar, denn sie wird als schwankendes Schiff, welches ohne feste Route auf dem Meer schaukelt, imaginiert. Das Meer ist die Gesellschaft bzw. die übergeordnete Gleichstellungspolitik. Diese wird als unberechenbar und launisch konzipiert, und die gleichstellungsorientierte Männerpolitik erscheint dabei als ausgeliefert.}},
author = {{Kastein, Mara}},
journal = {{ Forum Qualitative Sozialforschung}},
title = {{{Das schwankende Schiff der Männerpolitik: eine Metaphernanalyse}}},
doi = {{10.17169/FQS-22.2.3597}},
year = {{2021}},
}
@misc{24175,
booktitle = {{Gender a výzkum / Gender and Research}},
editor = {{Alemann, v.Annette and Gruhlich, Julia and Horwath, Ilona and Weber, Lena}},
issn = {{2570-6578}},
pages = {{86--102}},
title = {{{International Perspectives about COVID-19, Digital Labour and Gender Work Pattern: A Collective Interview}}},
doi = {{10.13060/gav.2020.014}},
year = {{2021}},
}
@misc{24173,
booktitle = {{Gender a výzkum / Gender and Research}},
editor = {{Alemann, v. Annette and Gruhlich, Julia and Horwath, Ilona and Weber, Lena}},
issn = {{2570-6578}},
pages = {{3--12}},
title = {{{A Plea to Reflect on the Entanglements of Gendered Work Patterns and Digital Technologies}}},
doi = {{10.13060/gav.2020.009}},
year = {{2021}},
}
@article{25476,
abstract = {{This study deals with the damage behavior of metallic materials by the application of different manufacturing processes and using different optical measurement methods to identify the crack initiation in the damage specimen. The study is intended to highlight the importance of considering manufacturing processes and optical measurement methods in a numerical simulation when analyzing the damage behavior of metallic materials. To describe the damage behavior of the material in the process chain simulations, it is important to calibrate the parameters of damage model more accurately. These parameters are determined using experimental investigation of desired damage specimens. In this regard, a selected damage specimen manufactured by different cutting processes is first experimentally and then numerically investigated. It is shown that the manufacturing process and the optical measurement methods influence the stress state analyzed in the numerical simulation.}},
author = {{Otroshi, Mortaza and Meschut, Gerson and Nesakumar, Aathavan}},
journal = {{Journal of Manufacturing Engineering}},
keywords = {{Damage behaviour, Stress triaxiality, Manufacturing process and Optical measurement}},
number = {{3}},
pages = {{70--76}},
title = {{{The influence of manufacturing processes and optical measurement methods on the damage behavior of HX340LAD micro-alloyed steels}}},
doi = {{https://doi.org/10.37255/jme.v16i3pp070-076}},
volume = {{16}},
year = {{2021}},
}
@book{22032,
abstract = {{The Arburg Plastic Freeforming (APF) is an additive manufacturing process which allows the production of three-dimensional thermoplastic components in layers. The components are produced by depositing fine, molten plastic droplets. The main advantage of the APF is the open-parameter control of the associated machine system. Thus, the process parameters can be optimized for individual applications. A special and new application of the APF is the production of interconnecting porous structures. As this is a novel approach with this manufacturing process, the general producibility and reproducibility must first be proven. Therefore, the relevant process parameters with an influence on the open-pored structures are identified. The volume of the individual plastic droplets, the distance between the droplets and the layer thickness are the three decisive influencing factors. With the use of analysis methods, the free spaces created in the structure are described by a uniformly constructed, interconnected pore structure. This means that the pores are interconnected in three dimensions. Reproducibility is evaluated by repeated production and thru the changed conditions during the manufacturing process. In addition, the multiplication and a change of geometry are evaluated in such a way that there is no influence on the pore size. Irregularities when depositing the first layer are caused by unevenness of the building platform. A suitable test arrangement is set up to determine the liquid permeability. A characteristic value is determined to describe the permeability to liquids.}},
author = {{Moritzer, Elmar and Hirsch, André and Dalmer, C.}},
isbn = {{978-3-030-54333-4}},
pages = {{112--129}},
publisher = {{Springer}},
title = {{{Investigation of Plastic Freeformed, Open-Pored Structures with Regard to Producibility, Reproducibility and Liquid Permeability}}},
doi = {{10.1007/978-3-030-54334-1}},
year = {{2021}},
}
@article{24162,
author = {{Moritzer, Elmar and Wächter, Julian and Elsner, Christian Lennart}},
journal = {{Macromolecular Symposia}},
number = {{1}},
publisher = {{Wiley}},
title = {{{Investigation of Specific FDM Process Parameters to Optimize the Polymer Discharge of Carbon Fiber Reinforced PEEK}}},
doi = {{10.1002/masy.202000269}},
volume = {{395}},
year = {{2021}},
}
@article{24681,
author = {{Moritzer, Elmar and Schumacher, Christian}},
issn = {{1022-1360}},
journal = {{Macromolecular Symposia}},
number = {{1}},
title = {{{Stainless Steel Parts Produced by Fused Deposition Modeling and a Sintering Process Compared to Components Manufactured in Selective Laser Melting}}},
doi = {{10.1002/masy.202000275}},
volume = {{395}},
year = {{2021}},
}
@article{21810,
author = {{Otroshi, Mortaza and Meschut, Gerson and Bielak, Christian Roman and Masendorf, Lukas and Esderts, Alfons}},
issn = {{1662-9795}},
journal = {{Key Engineering Materials}},
pages = {{35--40}},
publisher = {{Trans Tech Publications Ltd}},
title = {{{Modeling of Stiffness Anisotropy in Simulation of Self-Piercing Riveted Components}}},
doi = {{https://doi.org/10.4028/www.scientific.net/KEM.883.35}},
volume = {{883}},
year = {{2021}},
}
@inproceedings{24554,
author = {{Moritzer, Elmar and Elsner, Christian Lennart and Wächter, Julian and Knoop, Frederick}},
booktitle = {{79th Annual Technical Conference of the Society of Plastics Engineers (ANTEC)}},
title = {{{Investigation and Realization of Watertight FDM Structures Made of Ultem 9085 in Pressurized Systems}}},
year = {{2021}},
}
@article{23867,
abstract = {{The joining of plastics is required because component geometries are severely restricted in conventional manufacturing processes such as injection molding or extrusion. In addition to established processes such as hot plate welding, infrared welding, or vibration welding, hot gas butt welding is becoming more and more important industrially due to its advantages. The main benefits are the contactless heating process, the suitability for glass fiber reinforced, and high-temperature plastics as well as complex component geometries. However, various degradation phenomena can occur during the heating process used for economic reasons, due to the presence of oxygen in the air and to the high gas temperatures. In addition, the current patent situation suggests that welding with an oxidizing gas is not permissible depending on the material. On the other hand, however, there is experience from extrusion welding, with which long-term resistant weld seams can be produced using air. Investigations have shown that the same weld seam properties can be achieved with polypropylene using either air or nitrogen as the process gas. Experimental investigations have now been carried out on the suitability of different gases with regard to the weld seam quality when welding polyamides, which are generally regarded as more prone to oxidation. The results show that weld strengths are higher when nitrogen is used as process gas. However, equal weld strengths can be achieved with air and nitrogen when the material contains heat stabilizers.}},
author = {{Bialaschik, Max and Schöppner, Volker and Albrecht, Mirko and Gehde, Michael}},
issn = {{0043-2288}},
journal = {{Welding in the World}},
pages = {{1161--1169}},
title = {{{Influence of material degradation on weld seam quality in hot gas butt welding of polyamides}}},
doi = {{10.1007/s40194-021-01108-0}},
year = {{2021}},
}
@article{24555,
author = {{Moritzer, Elmar and Elsner, Christian Lennart and Schumacher, Christian}},
issn = {{0272-8397}},
journal = {{Polymer Composites}},
number = {{11}},
pages = {{6065--6079}},
title = {{{Investigation of Metal‐Polymer Composites Manufactured by Fused Deposition Modeling with Regard to Process Parameters}}},
doi = {{10.1002/pc.26285}},
volume = {{42}},
year = {{2021}},
}
@inproceedings{26821,
author = {{Wibbeke, Tim Michael and Bartley, Auerélie and Chudalla, Nick and Meschut, Gerson}},
booktitle = {{Fahrzeug + Karosserie und kfz-betrieb (Hrsg,); Tagungsband zu den Würzburger Karosserie- und Schadenstagen 22./23. Oktober 2021}},
title = {{{Fügen und Trennen von Kfz-Karosseriestrukturen in Leichtbauweise}}},
year = {{2021}},
}
@article{21814,
author = {{Gröger, Benjamin and Troschitz, Juliane and Vorderbrüggen, Julian and Vogel, Christian and Kupfer, Robert and Meschut, Gerson and Gude, Maik}},
journal = {{Materials}},
publisher = {{MDPI}},
title = {{{Clinching of Thermoplastic Composites and Metals—A Comparison of Three Novel Joining Technologies}}},
doi = {{https://doi.org/ 10.3390/ma14092286}},
year = {{2021}},
}
@article{28568,
abstract = {{AbstractRecent developments in automotive and aircraft industry towards a multi-material design pose challenges for modern joining technologies due to different mechanical properties and material compositions of various materials such as composites and metals. Therefore, mechanical joining technologies like clinching are in the focus of current research activities. For multi-material joints of metals and thermoplastic composites thermally assisted clinching processes with advanced tool concepts are well developed. The material-specific properties of fibre-reinforced thermoplastics have a significant influence on the joining process and the resulting material structure in the joining zone. For this reason, it is important to investigate these influences in detail and to understand the phenomena occurring during the joining process. Additionally, this provides the basis for a validation of a numerical simulation of such joining processes. In this paper, the material structure in a joint resulting from a thermally assisted clinching process is investigated. The joining partners are an aluminium sheet and a thermoplastic composite (organo sheet). Using computed tomography enables a three-dimensional investigation that allows a detailed analysis of the phenomena in different joining stages and in the material structure of the finished joint. Consequently, this study provides a more detailed understanding of the material behavior of thermoplastic composites during thermally assisted clinching.}},
author = {{Gröger, Benjamin and Köhler, Daniel and Vorderbrüggen, Julian and Troschitz, Juliane and Kupfer, Robert and Meschut, Gerson and Gude, Maik}},
issn = {{0944-6524}},
journal = {{Production Engineering}},
title = {{{Computed tomography investigation of the material structure in clinch joints in aluminium fibre-reinforced thermoplastic sheets}}},
doi = {{10.1007/s11740-021-01091-x}},
year = {{2021}},
}
@article{24131,
abstract = {{Glass/carbon fiber reinforced plastic (GFRP/CFRP) and hybrid components have attracted increasing attention in lightweight applications. However, residual stresses induced in the manufacturing process of these components can result in warpage and, eventually, negatively affect the mechanical performance of the composite structures. In the present work, GFRP, CFRP, GFRP/steel and CFRP/steel hybrid components were manufactured through the prepreg-press-technology always employing the same process parameters. The residual stresses of these components were measured through the hole drilling method (HDM), based on an adequate formalism to evaluate the residual stresses for orthotropic materials including the calculation of the calibration coefficients via finite element analysis (FEA). In FEA, the real material lay-up and mechanical properties of the samples were considered. The warpage induced by residual stresses was measured after the samples were removed from the tool. The measured residual stresses and warpage of four different types of samples were compared and results were analyzed in depth. The results obtained can be extended to other hybrid materials and even could be used for designing multi-stable laminates for application in adaptive structures. Moreover, the effects of the drilling process parameters of HDM, e.g., the drilling speed, the drilling increment and the zero-depth setting, on the resulting residual stresses of GFRP were investigated. The reliability of residual stress measurements in GFRP using HDM was validated through mechanical bending tests. The conclusions concerning the choice of optimal drilling parameters for GFRP could be directly applied for other types of samples considered in the present work.}},
author = {{Wu, Tao and Tinkloh, Steffen Rainer and Tröster, Thomas and Zinn, Wolfgang and Niendorf, Thomas}},
issn = {{2075-4701}},
journal = {{Metals}},
title = {{{Measurement and Analysis of Residual Stresses and Warpage in Fiber Reinforced Plastic and Hybrid Components}}},
doi = {{10.3390/met11020335}},
year = {{2021}},
}
@article{21064,
author = {{Tinkloh, Steffen Rainer and Wu, Tao and Tröster, Thomas and Niendorf, Thomas}},
issn = {{2075-4701}},
journal = {{Metals}},
title = {{{The Effect of Fiber Waviness on the Residual Stress State and Its Prediction by the Hole Drilling Method in Fiber Metal Laminates: A Global-Local Finite Element Analysis}}},
doi = {{10.3390/met11010156}},
year = {{2021}},
}
@article{24130,
author = {{Magnier, A. and Wu, T. and Tinkloh, Steffen Rainer and Tröster, Thomas and Scholtes, B. and Niendorf, T.}},
issn = {{0142-9418}},
journal = {{Polymer Testing}},
title = {{{On the reliability of residual stress measurements in unidirectional carbon fibre reinforced epoxy composites}}},
doi = {{10.1016/j.polymertesting.2021.107146}},
year = {{2021}},
}
@phdthesis{30849,
author = {{Henkenius, Carsten}},
title = {{{Entwurf netzfreundlicher Synchrongleichrichter mit integriertem Synchronwandler}}},
doi = {{10.17619/UNIPB/1-1109}},
year = {{2021}},
}
@article{22925,
author = {{Claes, Leander and Chatwell, René Spencer and Baumhögger, Elmar and Hetkämper, Tim and Zeipert, Henning and Vrabec, Jadran and Henning, Bernd}},
issn = {{0263-2241}},
journal = {{Measurement}},
title = {{{Measurement procedure for acoustic absorption and bulk viscosity of liquids}}},
doi = {{10.1016/j.measurement.2021.109919}},
year = {{2021}},
}
@inproceedings{21093,
abstract = {{Requirements for energy distribution networks are changing fast due to the growing share of renewable energy, increasing electrification, and novel consumer and asset technologies. Since uncertainties about future developments increase planning difficulty, flexibility potentials such as synergies between the electricity, gas, heat, and transport sector often remain unused. In this paper, we therefore present a novel module-based concept for a decision support system that helps distribution network planners to identify cross-sectoral synergies and to select optimal network assets such as transformers, cables, pipes, energy storage systems or energy conversion technology. The concept enables long-term transformation plans and supports distribution network planners in designing reliable, sustainable and cost-efficient distribution networks for future demands.}},
author = {{Kirchhoff, Jonas and Burmeister, Sascha Christian and Weskamp, Christoph and Engels, Gregor}},
booktitle = {{Energy Informatics and Electro Mobility ICT}},
editor = {{Breitner, Michael H. and Lehnhoff, Sebastian and Nieße, Astrid and Staudt, Philipp and Weinhardt, Christof and Werth, Oliver}},
title = {{{Towards a Decision Support System for Cross-Sectoral Energy Distribution Network Planning}}},
year = {{2021}},
}
@misc{30957,
author = {{Lammer, Christina}},
title = {{{Revolten in Gelb und Grün. In 'Rosa und Hannah. Das Blatt wenden' inspiriert Joke J. Hermsen für Krisenzeiten}}},
year = {{2021}},
}
@misc{31744,
author = {{Moritzer, Elmar and Hillemeyer, Johannes and Kramer, M. and Hopmann, C.}},
booktitle = {{Joining Plastics}},
issn = {{1864-3450}},
pages = {{94--103}},
title = {{{Designing of thermosetting plastic components for direct screwing - Auslegung von Duroplastbauteilen zur Direktverschraubung}}},
year = {{2021}},
}
@misc{31740,
author = {{Moritzer, Elmar and Richters, Maximilian}},
booktitle = {{Journal of Applied Polymer Science}},
number = {{38}},
title = {{{ Characterization of wood-filled thermoplastic polyurethanes for the injection molding process}}},
volume = {{138}},
year = {{2021}},
}
@inproceedings{31760,
author = {{Moritzer, Elmar and Krassmann, Dimitri and Brikmann, Johannes}},
booktitle = {{11. Fügetechnisches Gemeinschaftskolloquium}},
location = {{Dresden}},
title = {{{Entwicklung der Spritzniettechnik als werkstoffgerechtes Fügeverfahren für hybride Strukturen}}},
year = {{2021}},
}
@misc{31762,
author = {{Moritzer, Elmar and Jilg, J. and Rücker, Tobias}},
booktitle = {{Kunststoffe}},
pages = {{24--27}},
title = {{{Er kommt auf die Korngröße an, Mikrogranulat verbessert die Verteilung feindisperser Füllstoffe in der Direktcompoundierung}}},
year = {{2021}},
}
@misc{31758,
author = {{Schöppner, Volker and Martens, Jan Hendrik}},
booktitle = {{Kunststoffe}},
issn = {{0023- 5563}},
pages = {{91--93}},
title = {{{Eine runde Sache}}},
year = {{2021}},
}
@inproceedings{31767,
author = {{Hopp, Matthias and Tölle, Lisa}},
booktitle = {{36th International Conference of Polymer Processing Society (PPS)}},
title = {{{Influence of Fiber Content on the Fiber Dust Formation During Shredding for Mechanical Recycling of Different Glass and Carbon Fiber Reinforced Thermoplastics}}},
year = {{2021}},
}
@misc{31765,
author = {{Moritzer, Elmar and Hillemeyer, Johannes and Lotzin, R.}},
booktitle = {{Kunststoffe}},
issn = {{0023-5563}},
pages = {{42-- 45}},
title = {{{Fügeelement angespritzt - Einfluss auf die Verbundfestigkeit zwischen Organoblech und Schraubblindniet untersucht}}},
year = {{2021}},
}
@misc{31763,
author = {{Moritzer, Elmar and Wortmann, M. and Krieger, P. and Hüsgen, B. and Frese, N.}},
booktitle = {{ACS Omega}},
title = {{{Effect of Isocyanate Absorption on the Mechanical Properties of Silicone Elastomers in Polyurethane Vacuum Casting}}},
year = {{2021}},
}
@inproceedings{31774,
author = {{Moritzer, Elmar and Wächter, Julian and Fuhrmann, C.}},
booktitle = {{23rd International Conference Materials}},
isbn = {{1314-7269}},
location = {{Burgas (Bulgarien)}},
pages = {{58-- 67}},
title = {{{ INVESTIGATION OF THE PROCESSABILITY OF DIFFERENT HIGHPERFORMANCE MATERIALS IN THE FDM PROCESS WITH REGARD TO THE SHRINKAGE BEHAVIOR}}},
year = {{2021}},
}
@misc{31776,
author = {{Schöppner, Volker and Gevers, Karina}},
booktitle = {{K-Zeitung}},
issn = {{1436-6401}},
pages = {{19}},
title = {{{ Lebensdauer vorhersagen?}}},
year = {{2021}},
}
@misc{31775,
author = {{Moritzer, Elmar}},
booktitle = {{Kunststoffe}},
pages = {{64--67}},
title = {{{ Kühlen mit dem Wärmerohr}}},
year = {{2021}},
}
@inproceedings{31777,
author = {{Schöppner, Volker and Altepeter, Matthias and Wanke, Sven}},
booktitle = {{36th International Conference of the Polymer Processing Society (PPS)}},
location = {{Melbourne (Kanada)}},
title = {{{Material Degradation of Polypropylene on the Co-Rotating Twin Screw Extruder}}},
year = {{2021}},
}
@inbook{31718,
author = {{Willeke, Stephanie}},
booktitle = {{Schreiben, Text, Autorschaft II. Zur Narration und Störung von Lebens- und Schreibprozessen}},
editor = {{Gansel, Carsten and Lehnen , Katrin and Oswalt, Vadim }},
pages = {{131--158}},
publisher = {{V&R unipress }},
title = {{{Schriftstellerische Inszenierungspraktiken und autofiktionale Schreibreflexionen im Weblog Turmsegler von Benjamin Stein}}},
year = {{2021}},
}
@inproceedings{31781,
author = {{Moritzer, Elmar and Bürenhaus, Franziska Isabelle}},
booktitle = {{27. Techomer - Fachtagung über Verarbeitung und Anwendung von Polymeren}},
location = {{ Chemnitz (Online)}},
title = {{{Untersuchung der Faserlängenabnahme von kurz- und langglasfaserverstärk-ten Thermoplasten im Spritzgießprozess}}},
year = {{2021}},
}
@inbook{31724,
author = {{Willeke, Stephanie}},
booktitle = {{Prekäre Fakten, umstrittene Fiktionen. Fake News, Verschwörungstheorien und ihre kulturelle Aushandlung (Philologie im Netz Beiheft 25/2021) }},
editor = {{Wolf, Deborah and Podskalsky, Vera}},
pages = {{211--229}},
title = {{{Auf der Grenze zwischen Fakt und Fiktion. Fake News in der Polit-Serie The Good Fight}}},
year = {{2021}},
}
@misc{31778,
author = {{Moritzer, Elmar and Hillemeyer, Johannes and Lotzin, R.}},
booktitle = {{Kunststoffe International}},
issn = {{1862–4243}},
pages = {{29--32}},
title = {{{Molding on a Joining Element - Study of the Factors Influencing the Strength of the Bond between a Thermoplastic Composite and a Screw-in Blind Rivet}}},
year = {{2021}},
}
@misc{31779,
author = {{Hopp, Matthias and Tölle, Lisa and Hoemann, Theresa}},
booktitle = {{Gummi Fasern Kunststoffe}},
pages = {{2--7}},
title = {{{Reduzierung der Faserstaubentstehung beim mechanischen Recycling - Zerkleinern von carbonfaserverstärkten Polycarbonaten mit unterschiedlichen Verstärkungsformen}}},
year = {{2021}},
}
@misc{31780,
author = {{Moritzer, Elmar and Wortmann, M. and Frese, N. and Brinkmann, J. and Ehrmann, A. and Hüsgen, B.}},
booktitle = {{Macromolecular Symposia}},
title = {{{Silicone Mold Accuracy in Polyurethane Vacuum Casting}}},
year = {{2021}},
}
@inproceedings{31782,
author = {{Schöppner, Volker and Kleinschmidt, Dennis}},
booktitle = {{27. Techomer - Fachtagung über Verarbeitung und Anwendung von Polymeren}},
location = {{Chemnitz (Online) }},
title = {{{Viskoelastische Materialmodellierung in Strömungssimulationen}}},
year = {{2021}},
}
@inproceedings{31785,
author = {{Schöppner, Volker and Albrecht, M. and Gehde, M. and Bialaschik, Max Oliver}},
booktitle = {{Technomer}},
location = {{ Chemnitz (Deutschland)}},
title = {{{Warmgasstumpfschweißen - Einfluss des Werkzeugdesigns und des verwendeten Prozessgases auf das Erwärm- und Schweißverhalten}}},
year = {{2021}},
}
@inproceedings{31784,
author = {{Schöppner, Volker and Dörner, M. and Schall, Christoph Wilhelm Theodor}},
booktitle = {{Technomer 2021}},
location = {{Chemnitz}},
title = {{{Vorteilhaftes Prozessverhalten von Wave-Schnecken in der Einschneckenextrusion}}},
year = {{2021}},
}
@misc{31786,
author = {{Schöppner, Volker and Bialaschik, Max Oliver and Albrecht, M. and Gehde, M.}},
booktitle = {{Joining Plastics}},
issn = {{1864-3450}},
pages = {{162--169}},
title = {{{Warmgasstumpfschweißen von Kunststoffen}}},
year = {{2021}},
}
@inbook{31792,
author = {{Böker, Ines}},
booktitle = {{Drama und Theater der Gegenwart. Literarisches Lernen und ästhetische Bildung zwischen Textanalyse und Aufführungsrezeption (Beiträge zur Didaktik der deutschsprachigen Gegenwartsliteratur) }},
editor = {{Standke, Jan }},
pages = {{119--129}},
publisher = {{Wissenschaftlicher Verlag }},
title = {{{„Transkulturelle Wahrnehmungsräume in der Theaterdidaktik. Die Theaterarbeit von Nuran David Calis“}}},
volume = {{8}},
year = {{2021}},
}
@inproceedings{31771,
author = {{Moritzer, Elmar and Bürenhaus, Franziska Isabelle}},
booktitle = {{36th International Conference of the Polymer Processing Society (PPS)}},
location = {{ Montréal (Kanada)}},
title = {{{Investigation of Fiber Orientation and its Influence on Fiber Length Degradation in Simple Shear Flow for Glass Fiber Reinforced Polypropylene}}},
year = {{2021}},
}
@article{20212,
abstract = {{Ideational impact refers to the uptake of a paper's ideas and concepts by subsequent research. It is defined in stark contrast to total citation impact, a measure predominantly used in research evaluation that assumes that all citations are equal. Understanding ideational impact is critical for evaluating research impact and understanding how scientific disciplines build a cumulative tradition. Research has only recently developed automated citation classification techniques to distinguish between different types of citations and generally does not emphasize the conceptual content of the citations and its ideational impact. To address this problem, we develop Deep Content-enriched Ideational Impact Classification (Deep-CENIC) as the first automated approach for ideational impact classification to support researchers' literature search practices. We evaluate Deep-CENIC on 1,256 papers citing 24 information systems review articles from the IT business value domain. We show that Deep-CENIC significantly outperforms state-of-the-art benchmark models. We contribute to information systems research by operationalizing the concept of ideational impact, designing a recommender system for academic papers based on deep learning techniques, and empirically exploring the ideational impact of the IT business value domain.
}},
author = {{Prester, Julian and Wagner, Gerit and Schryen, Guido and Hassan, Nik Rushdi}},
journal = {{Decision Support Systems}},
keywords = {{Ideational impact, citation classification, academic recommender systems, natural language processing, deep learning, cumulative tradition}},
number = {{January}},
title = {{{Classifying the Ideational Impact of Information Systems Review Articles: A Content-Enriched Deep Learning Approach}}},
volume = {{140}},
year = {{2021}},
}
@article{20844,
abstract = {{Review papers are essential for knowledge development in IS. While some are cited twice a day, others accumulate single digit citations over a decade. The magnitude of these differences prompts us to analyze what distinguishes those reviews that have proven to be integral to scientific progress from those that might be considered less impactful. Our results highlight differences between reviews aimed at describing, understanding, explaining, and theory testing. Beyond the control variables, they demonstrate the importance of methodological transparency and the development of research agendas. These insights inform all stakeholders involved in the development and publication of review papers.}},
author = {{Wagner, Gerit and Prester, Julian and Roche, Maria and Schryen, Guido and Benlian, Alexander and Paré, Guy and Templier, Mathieu}},
journal = {{Information & Management}},
keywords = {{Literature review, review papers, scientometric, scientific impact, citation analysis}},
number = {{3}},
title = {{{Which Factors Affect the Scientific Impact of Review Papers in IS Research? A Scientometric Study}}},
volume = {{58}},
year = {{2021}},
}
@article{23494,
author = {{Stumpe, Miriam and Rößler, David and Schryen, Guido and Kliewer, Natalia}},
journal = {{EURO Journal on Transportation and Logistics}},
title = {{{Study on Sensitivity of Electric Bus Systems under Simultaneous Optimization of Charging Infrastructure and Vehicle Schedules}}},
doi = {{https://doi.org/10.1016/j.ejtl.2021.100049}},
volume = {{10}},
year = {{2021}},
}
@article{17934,
author = {{Wagner, Gerit and Prester, Julian and Schryen, Guido}},
journal = {{Communications of the Association for Information Systems}},
number = {{1}},
title = {{{Exploring the Scientific Impact of Information Systems Design Science Research}}},
volume = {{48}},
year = {{2021}},
}
@book{32030,
author = {{Altun, Tülay and Handt, Claudia and Hinrichs, Beatrix and Hoffacker, Anna and Niederhaus, Constanze and Weis, Ingrid}},
publisher = {{Klett; Deutsch Lehren und Lernen 17}},
title = {{{Sprachbildung in der Grundschule}}},
year = {{2021}},
}
@inbook{32056,
author = {{Dohmann, Olga and Drumm, Sandra and Niederhaus, Constanze}},
booktitle = {{Zur sprachlichen und gesellschaftlichen Integration neu zugewanderter Menschen. Eine Bilanz. Materialien Deutsch als Zweit- und Fremdsprache 105}},
editor = {{Freudenberg-Findeisen, Renate and Harsch, Claudia and Middeke, Annegret}},
pages = {{273--294}},
publisher = {{Universitätsverlag}},
title = {{{Schreibberatung im Kontext beruflicher Bildung und ihre Auswirkung auf Emotionen beim Schreiben}}},
year = {{2021}},
}
@inbook{32060,
author = {{Peuschel, Kristina and Petersen, Inger and Reble, Raja and Haberzettl, Stefanie and Berkel-Otto, Lisa and Niederhaus, Constanze and Steinmetz, Sandra and Rojahn, Pia and Sondershaus, Eva}},
booktitle = {{Theorie-Praxis-Verzahnung in der Lehrkräftebildung Ergebnisse aus dem Netzwerk „Stark durch Diversität“}},
editor = {{Berkel-Otto, Lisa and Peuschel, Kristina and Steinmetz, Sandra}},
pages = {{13--36}},
publisher = {{Waxmann Verlag}},
title = {{{Der besondere Moment - Ergebnisse aus der Evaluation der Projekte „Sprachförderung PLUS“ im Netzwerk „Stark durch Diversität“}}},
year = {{2021}},
}
@phdthesis{32057,
abstract = {{Ein zentraler Aspekt bei der Untersuchung dynamischer Systeme ist die Analyse ihrer invarianten Mengen wie des globalen Attraktors und (in)stabiler Mannigfaltigkeiten. Insbesondere wenn das zugrunde liegende System von einem Parameter abhängt, ist es entscheidend, sie im Bezug auf diesen Parameter effizient zu verfolgen. Für die Berechnung invarianter Mengen stützen wir uns für ihre Approximation auf numerische Algorithmen. Typischerweise können diese Methoden jedoch nur auf endlich-dimensionale dynamische Systeme angewendet werden. In dieser Arbeit präsentieren wir daher einen numerischen Rahmen für die globale dynamische Analyse unendlich-dimensionaler Systeme. Wir werden Einbettungstechniken verwenden, um das core dynamical system (CDS) zu definieren, welches ein dynamisch äquivalentes endlich-dimensionales System ist.Das CDS wird dann verwendet, um eingebettete invariante Mengen, also eins-zu-eins Bilder, mittels Mengen-orientierten numerischen Methoden zu approximieren. Bei der Konstruktion des CDS ist es entscheidend, eine geeignete Beobachtungsabbildung auszuwählen und die geeignete inverse Abbildung zu entwerfen. Dazu werden wir geeignete numerische Implementierungen des CDS für DDEs und PDEs vorstellen. Für eine nachfolgende geometrische Analyse der eingebetteten invarianten Menge betrachten wir eine Lerntechnik namens diffusion maps, die ihre intrinsische Geometrie enthüllt sowie ihre Dimension schätzt. Schließlich wenden wir unsere entwickelten numerischen Methoden an einigen bekannten unendlich-dimensionale dynamischen Systeme an, wie die Mackey-Glass-Gleichung, die Kuramoto-Sivashinsky-Gleichung und die Navier-Stokes-Gleichung.}},
author = {{Gerlach, Raphael}},
title = {{{The Computation and Analysis of Invariant Sets of Infinite-Dimensional Systems}}},
doi = {{10.17619/UNIPB/1-1278}},
year = {{2021}},
}
@article{32016,
author = {{Delarue, Benjamin and Ramacher, Pablo}},
journal = {{Journal of Symplectic Geometry}},
number = {{6}},
pages = {{1281 -- 1337}},
title = {{{Asymptotic expansion of generalized Witten integrals for Hamiltonian circle actions}}},
doi = {{10.4310/JSG.2021.v19.n6.a1}},
volume = {{19}},
year = {{2021}},
}
@inproceedings{32125,
abstract = {{Fault coverage analysis and fault simulation are well-established methods for the qualification of test vectors in hardware design. However, their role in virtual prototyping and the correlation to later steps in the design process need further investigation. We introduce a metric for RISC-V instruction and register coverage for binary software. The metric measures if RISC-V instruction types are executed and if GPRs, CSRs, and FPRs are accessed. The analysis is applied by the means of a virtual prototype which is based on an abstract instruction and register model with direct correspondence to their bit level representation. In this context, we analyzed three different openly available test suites: the RISC-V architectural testing framework, the RISC-V unit tests, and programs which are automatically generated by the RISC-V Torture test generator. We discuss their tradeoffs and show that by combining them to a unified test suite we can arrive at a 100% GPR and FPR register coverage and a 98.7% instruction type coverage.}},
author = {{Adelt, Peer and Koppelmann, Bastian and Müller, Wolfgang and Scheytt, Christoph}},
booktitle = {{MBMV 2021 - Methods and Description Languages for Modelling and Verification of Circuits and Systems; GMM/ITG/GI-Workshop}},
isbn = {{978-3-8007-5500-4}},
publisher = {{VDE}},
title = {{{Register and Instruction Coverage Analysis for Different RISC-V ISA Modules}}},
year = {{2021}},
}
@inproceedings{24439,
author = {{Gräßler, Iris and Hesse, Philipp}},
location = {{Valletta, Malta}},
pages = {{37--41}},
publisher = {{The University of Malta}},
title = {{{Decision Support for Product Specific Recycling}}},
year = {{2021}},
}
@misc{28707,
author = {{Peckhaus, Volker}},
booktitle = {{Zentralblatt für Mathematik und ihre Grenzgebiete}},
title = {{{Bolzano, Bernard, "Briefe an Michael Josef Fesl 1831–1836", hg. v. Otto Neumaier, Frommann-Holzboog, Eckhart Holzboog: Stuttgart-Bad Cannstatt 2020 (Bernard Bolzano-Gesamtausgabe. Reihe III: Briefwechsel. Bd. 2.2)}}},
year = {{2021}},
}
@misc{28705,
author = {{Peckhaus, Volker}},
booktitle = {{Zentralblatt für Mathematik und ihre Grenzgebiete }},
title = {{{Negrepontis, Stelios, “Plato on Geometry and the Geometers”, in: S.G. Dani et al. (eds.), Geometry in History, Cham: Springer 2019, 1–88}}},
year = {{2021}},
}
@misc{28709,
author = {{Peckhaus, Volker}},
booktitle = {{Zentralblatt für Mathematik und ihre Grenzgebiete }},
title = {{{Rusnock, Paul, “Bolzano on Continuity”, in: Stewart Shapiro et. al. (eds.), The History of Continua. Philosophical and Mathematical Perspectives, Oxford: Oxford University Press 2021, 188–218}}},
year = {{2021}},
}
@inbook{32199,
author = {{Ptashnyk, Stefaniya}},
booktitle = {{Historisches Codeswitching mit Deutsch. Multilinguale Praktiken in der Sprachge-schichte}},
editor = {{Glaser, Elvira and Prinz, Michael and Ptashnyk, Stefaniya }},
pages = {{403–436}},
publisher = {{de Gruyter}},
title = {{{Codeswitching und seine „Geschwister“. Zur Typologie der historischen multilingualen Schreibpraktiken (am Beispiel der Lemberger Zeitungen des 19. Jahrhunderts)}}},
year = {{2021}},
}
@inbook{32192,
author = {{Ptashnyk, Stefaniya}},
booktitle = {{Historisches Codeswitching mit Deutsch}},
editor = {{Glaser, Elvira and Prinz, Michael and Ptashnyk, Stefaniya }},
publisher = {{de Gruyter}},
title = {{{Multilinguale Praktiken in der Sprachgeschich-te}}},
year = {{2021}},
}
@inbook{32200,
author = {{Ptashnyk, Stefaniya and Glaser, Elvira and Prinz, Michael }},
booktitle = {{Historisches Codeswitching mit Deutsch. Multilinguale Praktiken in der Sprachgeschichte}},
editor = {{Glaser, Elvira and Prinz, Michael and Ptashnyk, Stefaniya}},
pages = {{1–12}},
publisher = {{de Gruyte}},
title = {{{Historisches Codeswitching mit Deutsch: Eine Einleitung}}},
year = {{2021}},
}
@article{32243,
abstract = {{Abstract
The defining feature of active particles is that they constantly propel themselves by locally converting chemical energy into directed motion. This active self-propulsion prevents them from equilibrating with their thermal environment (e.g. an aqueous solution), thus keeping them permanently out of equilibrium. Nevertheless, the spatial dynamics of active particles might share certain equilibrium features, in particular in the steady state. We here focus on the time-reversal symmetry of individual spatial trajectories as a distinct equilibrium characteristic. We investigate to what extent the steady-state trajectories of a trapped active particle obey or break this time-reversal symmetry. Within the framework of active Ornstein–Uhlenbeck particles we find that the steady-state trajectories in a harmonic potential fulfill path-wise time-reversal symmetry exactly, while this symmetry is typically broken in anharmonic potentials.}},
author = {{Dabelow, Lennart and Bo, Stefano and Eichhorn, Ralf}},
issn = {{1742-5468}},
journal = {{Journal of Statistical Mechanics: Theory and Experiment}},
keywords = {{Statistics, Probability and Uncertainty, Statistics and Probability, Statistical and Nonlinear Physics}},
number = {{3}},
publisher = {{IOP Publishing}},
title = {{{How irreversible are steady-state trajectories of a trapped active particle?}}},
doi = {{10.1088/1742-5468/abe6fd}},
volume = {{2021}},
year = {{2021}},
}
@unpublished{32244,
abstract = {{We push the boundaries of electronic structure-based \textit{ab-initio}
molecular dynamics (AIMD) beyond 100 million atoms. This scale is otherwise
barely reachable with classical force-field methods or novel neural network and
machine learning potentials. We achieve this breakthrough by combining
innovations in linear-scaling AIMD, efficient and approximate sparse linear
algebra, low and mixed-precision floating-point computation on GPUs, and a
compensation scheme for the errors introduced by numerical approximations. The
core of our work is the non-orthogonalized local submatrix method (NOLSM),
which scales very favorably to massively parallel computing systems and
translates large sparse matrix operations into highly parallel, dense matrix
operations that are ideally suited to hardware accelerators. We demonstrate
that the NOLSM method, which is at the center point of each AIMD step, is able
to achieve a sustained performance of 324 PFLOP/s in mixed FP16/FP32 precision
corresponding to an efficiency of 67.7% when running on 1536 NVIDIA A100 GPUs.}},
author = {{Schade, Robert and Kenter, Tobias and Elgabarty, Hossam and Lass, Michael and Schütt, Ole and Lazzaro, Alfio and Pabst, Hans and Mohr, Stephan and Hutter, Jürg and Kühne, Thomas D. and Plessl, Christian}},
booktitle = {{arXiv:2104.08245}},
title = {{{Towards Electronic Structure-Based Ab-Initio Molecular Dynamics Simulations with Hundreds of Millions of Atoms}}},
year = {{2021}},
}
@unpublished{32245,
abstract = {{Optical travelling wave antennas offer unique opportunities to control and
selectively guide light into a specific direction which renders them as
excellent candidates for optical communication and sensing. These applications
require state of the art engineering to reach optimized functionalities such as
high directivity and radiation efficiency, low side lobe level, broadband and
tunable capabilities, and compact design. In this work we report on the
numerical optimization of the directivity of optical travelling wave antennas
made from low-loss dielectric materials using full-wave numerical simulations
in conjunction with a particle swarm optimization algorithm. The antennas are
composed of a reflector and a director deposited on a glass substrate and an
emitter placed in the feed gap between them serves as an internal source of
excitation. In particular, we analysed antennas with rectangular- and
horn-shaped directors made of either Hafnium dioxide or Silicon. The optimized
antennas produce highly directional emission due to the presence of two
dominant guided TE modes in the director in addition to leaky modes. These
guided modes dominate the far-field emission pattern and govern the direction
of the main lobe emission which predominately originates from the end facet of
the director. Our work also provides a comprehensive analysis of the modes,
radiation patterns, parametric influences, and bandwidths of the antennas that
highlights their robust nature.}},
author = {{Farheen, Henna and Leuteritz, Till and Linden, Stefan and Myroshnychenko, Viktor and Förstner, Jens}},
booktitle = {{arXiv:2106.02468}},
title = {{{Optimization of optical waveguide antennas for directive emission of light}}},
year = {{2021}},
}
@inbook{32251,
author = {{Ptashnyk, Stefaniya}},
booktitle = {{Institutionen – Praktiken – Biographien. Verankerung und Profilierung der germanis-tischen Forschung und Lehre}},
editor = {{Korn, Uwe Maximillian and Żarski, Krzysztof }},
pages = {{197–208}},
publisher = {{Harrassowitz }},
title = {{{Von der Schwierigkeit des biografischen Schreibens über Ludwik Fleck}}},
year = {{2021}},
}
@article{26146,
author = {{Hein-Pensel, Franziska and Knorr, Karin and Oertel, Simon and Thommes, Kirsten}},
issn = {{0065-0668}},
journal = {{Academy of Management Proceedings}},
title = {{{Incongruent Patterns of Organizational Identity Crafting by Different Organizational Actors}}},
doi = {{10.5465/ambpp.2021.15048abstract}},
year = {{2021}},
}
@misc{29141,
author = {{Peckhaus, Volker}},
booktitle = {{Mathematical Reviews }},
title = {{{Fan, Zhao, “Hobson’s Conception of Definable Numbers”, In: History and Philosophy of Logic 41 (2020)}}},
year = {{2021}},
}
@misc{29144,
author = {{Peckhaus, Volker}},
booktitle = {{Mathematical Reviews }},
title = {{{Vlasáková, Marta, “Logic and Sets”, In: Logic and Logical Philosophy 29 (2020)}}},
year = {{2021}},
}
@inbook{22052,
abstract = {{In this study, we describe a text processing pipeline that transforms user-generated text into structured data. To do this, we train neural and transformer-based models for aspect-based sentiment analysis. As most research deals with explicit aspects from product or service data, we extract and classify implicit and explicit aspect phrases from German-language physician review texts. Patients often rate on the basis of perceived friendliness or competence. The vocabulary is difficult, the topic sensitive, and the data user-generated. The aspect phrases come with various wordings using insertions and are not noun-based, which makes the presented case equally relevant and reality-based. To find complex, indirect aspect phrases, up-to-date deep learning approaches must be combined with supervised training data. We describe three aspect phrase datasets, one of them new, as well as a newly annotated aspect polarity dataset. Alongside this, we build an algorithm to rate the aspect phrase importance. All in all, we train eight transformers on the new raw data domain, compare 54 neural aspect extraction models and, based on this, create eight aspect polarity models for our pipeline. These models are evaluated by using Precision, Recall, and F-Score measures. Finally, we evaluate our aspect phrase importance measure algorithm.}},
author = {{Kersting, Joschka and Geierhos, Michaela}},
booktitle = {{Natural Language Processing and Information Systems}},
editor = {{Kapetanios, Epaminondas and Horacek, Helmut and Métais, Elisabeth and Meziane, Farid}},
location = {{Saarbrücken, Germany}},
pages = {{231----242}},
publisher = {{Springer}},
title = {{{Human Language Comprehension in Aspect Phrase Extraction with Importance Weighting}}},
volume = {{12801}},
year = {{2021}},
}
@article{26719,
abstract = {{AbstractThe interaction of acute exercise and the central nervous system evokes increasing interest in interdisciplinary research fields of neuroscience. Novel approaches allow to monitor large-scale brain networks from mobile electroencephalography (EEG) applying graph theory, but it is yet uncertain whether brain graphs extracted after exercise are reliable. We therefore aimed to investigate brain graph reliability extracted from resting state EEG data before and after submaximal exercise twice within one week in male participants. To obtain graph measures, we extracted global small-world-index (SWI), clustering coefficient (CC) and characteristic path length (PL) based on weighted phase leg index (wPLI) and spectral coherence (Coh) calculation. For reliability analysis, Intraclass-Correlation-Coefficient (ICC) and Coefficient of Variation (CoV) were computed for graph measures before (REST) and after POST) exercise. Overall results revealed poor to excellent measures at PRE and good to excellent ICCs at POST in the theta, alpha-1 and alpha-2, beta-1 and beta-2 frequency band. Based on bootstrap-analysis, a positive effect of exercise on reliability of wPLI based measures was observed, while exercise induced a negative effect on reliability of Coh-based graph measures. Findings indicate that brain graphs are a reliable tool to analyze brain networks in exercise contexts, which might be related to the neuroregulating effect of exercise inducing functional connections within the connectome. Relative and absolute reliability demonstrated good to excellent reliability after exercise. Chosen graph measures may not only allow analysis of acute, but also longitudinal studies in exercise-scientific contexts.
}},
author = {{Büchel, Daniel and Lehmann, Tim and Sandbakk, Øyvind and Baumeister, Jochen}},
issn = {{2045-2322}},
journal = {{Scientific Reports}},
title = {{{EEG-derived brain graphs are reliable measures for exploring exercise-induced changes in brain networks}}},
doi = {{10.1038/s41598-021-00371-x}},
year = {{2021}},
}
@misc{24671,
author = {{Ahmeckovic, Emina}},
title = {{{Die Sterne sind für alle da - Eine empirische Untersuchung zu Anforderungen der Gestaltung von barrierefreien Online-Bewertungssystemen}}},
year = {{2021}},
}
@misc{23554,
author = {{Pieper, Florian}},
title = {{{Systematische Identifikation und Analyse von Vorgehensmodellen zur Geschäftsmodellentwicklung auf digitalen Plattformen}}},
year = {{2021}},
}
@misc{24576,
author = {{Funk, Daniel}},
title = {{{Wer schreibt der bleibt – Eine quantitative Untersuchung der Kundenbeziehung in Brand Communities und Smart Service Systems}}},
year = {{2021}},
}
@misc{25181,
author = {{Rümpker, Till}},
title = {{{Wechselwirkungen von Hemmnissen und Motivatoren mit Blick auf die Abgabe von Online-Bewertungen}}},
year = {{2021}},
}