@inproceedings{24017,
  abstract     = {{In developing complex technical systems, requirements are subject to continuous change. Systematic and holistic change impact analysis and proactive measures are required for reducing the number of requirement changes and their negative impact. There is no method to analyse the holistic impact of a requirement change in the context of developing complex technical systems. Holistic analysis requires to consider the local effects of requirement changes as well as effects from change propagation. To develop an approach for holistic change propagation and impact analysis, twelve performance goals are defined. Those are derived from a state of research analysis as well as an industry workshop. A three-step method is proposed. Firstly, requirement dependencies that cause change propagation are detected. Secondly, critical requirements are automatically identified based on a Page Rank algorithm. Thirdly, change impact of critical requirements is analysed based on a guideline. Validation proves that ten goals are fulfilled and two are partly fulfilled. The method addresses major shortcomings of preceding research and enables sound decision making for development engineers both before a change occurs and during decision process on a change request. This helps to reduce negative change impact in development projects and the risk of project failure.}},
  author       = {{Gräßler, Iris and Oleff, Christian and Preuß, Daniel}},
  editor       = {{Wagner, Beverly and Wilson, Juliette}},
  location     = {{Strathclyde/Glasgow}},
  title        = {{{Holistic change propagation and impact analysis in requirements management}}},
  year         = {{2021}},
}

@article{31442,
  author       = {{Hagengruber, Ruth}},
  journal      = {{Konsens}},
  pages        = {{31}},
  title        = {{{Vizepräsidentin a.D. des DAB, Prof. Dr. Ulrike Detmers verleiht zum 20. Mal den von ihr ins Leben gerufenen Preis‚ Managerin des Jahres}}},
  year         = {{2021}},
}

@article{34647,
  author       = {{Brögelmann, T and Bobzin, K and Grundmeier, Guido and de los Arcos, T and Kruppe, N C and Schwiderek, S and Carlet, M}},
  issn         = {{0022-3727}},
  journal      = {{Journal of Physics D: Applied Physics}},
  keywords     = {{Surfaces, Coatings and Films, Acoustics and Ultrasonics, Condensed Matter Physics, Electronic, Optical and Magnetic Materials}},
  number       = {{3}},
  publisher    = {{IOP Publishing}},
  title        = {{{Durability of nanolayer Ti–Al–O–N hard coatings under simulated polycarbonate melt processing conditions}}},
  doi          = {{10.1088/1361-6463/ac2e31}},
  volume       = {{55}},
  year         = {{2021}},
}

@article{30680,
  author       = {{Weiß, D. and Schramm, B. and Kullmer, G.}},
  journal      = {{Key Engineering Materials}},
  pages        = {{127--132}},
  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}},
}

@inproceedings{29217,
  abstract     = {{The circuit design and measurement results of a mixed-signal receiver baseband circuit for a wireless high data rate communication system are presented. The circuit design of the two most important system blocks of the sliced receiver baseband architecture, namely the broadband, programmable code-generator circuit, and the integrate and dump correlator circuit are explained. Using parallel sequence spread spectrum (PSSS) with PAM-4 modulated data, a net data rate of 2.22 Gbps is demonstrated with a single receiver baseband slice circuit working with a chip rate of 20 Gcps. A total of 15 slices are required to recover all 15 parallelly transmitted symbols resulting in the net data rate of 33.33 Gbps. This is the first reported implementation of a mixed-signal PSSS baseband circuit.}},
  author       = {{Javed, Abdul Rehman and Scheytt, J. Christoph}},
  booktitle    = {{2021 IEEE International Midwest Symposium on Circuits and Systems (MWSCAS)}},
  publisher    = {{IEEE}},
  title        = {{{Mixed-Signal Receiver Baseband Slice for High-Data-Rate Communication Using 130 nm SiGe BiCMOS Technology}}},
  doi          = {{10.1109/MWSCAS47672.2021.9531711}},
  year         = {{2021}},
}

@inproceedings{29221,
  abstract     = {{An m-sequence radar with a high chip rate of 20 Gcps is presented that makes use of the large bandwidth available in the V-band (40-75 GHz) or at 240 GHz to reduce the detection resolution to 7.5 mm. Measurement results of a mixed-signal radar receiver baseband (BB) integrated circuit designed using 130 nm SiGe BiCMOS technology are presented along with a novel radar ranging concept for the mixed-signal radar BB.}},
  author       = {{Javed, Abdul Rehman and Scheytt, J. Christoph}},
  booktitle    = {{2020 17th European Radar Conference (EuRAD)}},
  publisher    = {{IEEE}},
  title        = {{{M-Sequence Radar for High Resolution Ranging with Mixed-Signal Radar Receiver Baseband Using 130nm SiGe BiCMOS Technology}}},
  doi          = {{10.1109/EuRAD48048.2021.00029}},
  year         = {{2021}},
}

@article{29699,
  author       = {{Ghasemi, S. Alireza and Kühne, Thomas D.}},
  journal      = {{The Journal of Chemical Physics}},
  number       = {{7}},
  pages        = {{074107}},
  title        = {{{Artificial neural networks for the kinetic energy functional of non-interacting fermions}}},
  doi          = {{10.1063/5.0037319}},
  volume       = {{154}},
  year         = {{2021}},
}

@article{31261,
  abstract     = {{<jats:title>Abstract</jats:title>
               <jats:p>For a compact Riemannian locally symmetric space $\mathcal M$ of rank 1 and an associated vector bundle $\mathbf V_{\tau }$ over the unit cosphere bundle $S^{\ast }\mathcal M$, we give a precise description of those classical (Pollicott–Ruelle) resonant states on $\mathbf V_{\tau }$ that vanish under covariant derivatives in the Anosov-unstable directions of the chaotic geodesic flow on $S^{\ast }\mathcal M$. In particular, we show that they are isomorphically mapped by natural pushforwards into generalized common eigenspaces of the algebra of invariant differential operators $D(G,\sigma )$ on compatible associated vector bundles $\mathbf W_{\sigma }$ over $\mathcal M$. As a consequence of this description, we obtain an exact band structure of the Pollicott–Ruelle spectrum. Further, under some mild assumptions on the representations $\tau$ and $\sigma$ defining the bundles $\mathbf V_{\tau }$ and $\mathbf W_{\sigma }$, we obtain a very explicit description of the generalized common eigenspaces. This allows us to relate classical Pollicott–Ruelle resonances to quantum eigenvalues of a Laplacian in a suitable Hilbert space of sections of $\mathbf W_{\sigma }$. Our methods of proof are based on representation theory and Lie theory.</jats:p>}},
  author       = {{Küster, Benjamin and Weich, Tobias}},
  issn         = {{1073-7928}},
  journal      = {{International Mathematics Research Notices}},
  keywords     = {{General Mathematics}},
  number       = {{11}},
  pages        = {{8225--8296}},
  publisher    = {{Oxford University Press (OUP)}},
  title        = {{{Quantum-Classical Correspondence on Associated Vector Bundles Over Locally Symmetric Spaces}}},
  doi          = {{10.1093/imrn/rnz068}},
  volume       = {{2021}},
  year         = {{2021}},
}

@article{27571,
  abstract     = {{<jats:p>(1) Background: Evidence has accumulated that patients with anorexia nervosa (AN) are at higher risk for vitamin D deficiency than healthy controls. In epidemiologic studies, low 25(OH) vitamin D (25(OH)D) levels were associated with depression. This study analyzed the relationship between 25(OH)D serum levels in adolescent patients and AN and depressive symptoms over the course of treatment. (2) Methods: 25(OH)D levels and depressive symptoms were analyzed in 93 adolescent (in-)patients with AN from the Anorexia Nervosa Day patient versus Inpatient (ANDI) multicenter trial at clinic admission, discharge, and 1 year follow up. Mixed regression models were used to analyze the relationship between 25(OH)D levels and depressive symptoms assessed by the Beck Depression Inventory (BDI-II). (3) Results: Although mean 25(OH)D levels constantly remained in recommended ranges (≥50 nmol/L) during AN treatment, levels decreased from (in)patient admission to 1 year follow up. Levels of 25(OH)D were neither cross-sectionally, prospectively, nor longitudinally associated with the BDI-II score. (4) Conclusions: This study did not confirm that 25(OH)D levels are associated with depressive symptoms in patients with AN. However, increasing risks of vitamin D deficiency over the course of AN treatment indicate that clinicians should monitor 25(OH)D levels.</jats:p>}},
  author       = {{Föcker, Manuel and Timmesfeld, Nina and Bühlmeier, Judith and Zwanziger, Denise and Führer, Dagmar and Grasemann, Corinna and Ehrlich, Stefan and Egberts, Karin and Fleischhaker, Christian and Wewetzer, Christoph and Wessing, Ida and Seitz, Jochen and Herpertz-Dahlmann, Beate and Hebebrand, Johannes and Libuda, Lars}},
  issn         = {{2072-6643}},
  journal      = {{Nutrients}},
  title        = {{{Vitamin D Level Trajectories of Adolescent Patients with Anorexia Nervosa at Inpatient Admission, during Treatment, and at One Year Follow Up: Association with Depressive Symptoms}}},
  doi          = {{10.3390/nu13072356}},
  year         = {{2021}},
}

@article{26632,
  abstract     = {{<jats:title>Abstract</jats:title><jats:p>Anorexia nervosa (AN) is a severe eating disorder and often associated with altered humoral immune responses. However, distinct B cell maturation stages in peripheral blood in adolescents with AN have not been characterized. Treatment effects and the relationship between clinical and B cell parameters are also not fully understood. Here we investigated the phenotype of circulating B cell subsets and the relationship with body composition in adolescents with AN before (T0, n = 24) and after 6 weeks (T1, n = 20) of treatment. Using multi-parameter flow cytometry, we found increased percentages of antigen-experienced B cells and plasmablasts in patients with AN compared to healthy controls (n = 20). In contrast, percentages of CD1d<jats:sup>+</jats:sup>CD5<jats:sup>+</jats:sup> B cells and transitional B cells with immunoregulatory roles were reduced at T0 and T1. These B cell frequencies correlated positively with fat mass, fat mass index (FMI), free fat mass index, and body mass index standard deviation score. In addition, scavenger-like receptor CD5 expression levels were downregulated on transitional B cells and correlated with fat mass and FMI in AN. Our findings that regulatory B cell subgroups were reduced in AN and their strong relationship with body composition parameters point toward an impact of immunoregulatory B cells in the pathogenesis of AN.</jats:p>}},
  author       = {{Freff, Jana and Schwarte, Kathrin and Bröker, Lisa and Bühlmeier, Judith and Kraft, Isabelle and Öztürk, Dana and Hinney, Anke and Arolt, Volker and Dannlowski, Udo and Romer, Georg and Baune, Bernhard T. and Hebebrand, Johannes and Föcker, Manuel and Alferink, Judith}},
  issn         = {{2045-2322}},
  journal      = {{Scientific Reports}},
  title        = {{{Alterations in B cell subsets correlate with body composition parameters in female adolescents with anorexia nervosa}}},
  doi          = {{10.1038/s41598-020-80693-4}},
  year         = {{2021}},
}

@inbook{33434,
  author       = {{Knickenberg, Margarita and Zurbriggen, Carmen}},
  booktitle    = {{G. Hagenauer & D. Raufelder (Hrsg.), Soziale Eingebundenheit. Sozialbeziehungen im Fokus von Schule und Lehrer*innenbildung}},
  editor       = {{Hagenauer, G and Raufelder, D}},
  pages        = {{335--350}},
  publisher    = {{Waxmann}},
  title        = {{{Die Bedeutsamkeit von Peers für Jugendliche in der Sekundarstufe und in der Freizeit}}},
  year         = {{2021}},
}

@article{33587,
  abstract     = {{<jats:title>Abstract</jats:title>
               <jats:p>We performed a virtual materials screening to identify promising topological materials for photocatalytic water splitting under visible light irradiation. Topological compounds were screened based on band gap, band edge energy, and thermodynamics stability criteria. In addition, topological types for our final candidates were computed based on electronic structures calculated usingthe hybrid density functional theory including exact Hartree–Fock exchange. Our final list contains materials which have band gaps between 1.0 and 2.7 eV in addition to band edge energies suitable for water oxidation and reduction. However, the topological types of these compounds calculated with the hybrid functional differ from those reported previously. To that end, we discuss the importance of computational methods for the calculation of atomic and electronic structures in materials screening processes.</jats:p>}},
  author       = {{Ranjbar, Ahmad and Mirhosseini, Hossein and Kühne, Thomas D}},
  issn         = {{2515-7639}},
  journal      = {{Journal of Physics: Materials}},
  keywords     = {{Condensed Matter Physics, General Materials Science, Atomic and Molecular Physics, and Optics}},
  number       = {{1}},
  publisher    = {{IOP Publishing}},
  title        = {{{On topological materials as photocatalysts for water splitting by visible light}}},
  doi          = {{10.1088/2515-7639/ac363d}},
  volume       = {{5}},
  year         = {{2021}},
}

@article{33643,
  abstract     = {{<jats:p>The origin of strong interactions between water molecules and porous C<jats:sub>2</jats:sub>N surfaces is investigated by using a combination of model materials, volumetric physisorption measurements, solid-state NMR spectroscopy, and DFT calculations.</jats:p>}},
  author       = {{Heske, Julian Joachim and Walczak, Ralf and Epping, Jan D. and Youk, Sol and Sahoo, Sudhir K. and Antonietti, Markus and Kühne, Thomas and Oschatz, Martin}},
  issn         = {{2050-7488}},
  journal      = {{Journal of Materials Chemistry A}},
  keywords     = {{General Materials Science, Renewable Energy, Sustainability and the Environment, General Chemistry}},
  number       = {{39}},
  pages        = {{22563--22572}},
  publisher    = {{Royal Society of Chemistry (RSC)}},
  title        = {{{When water becomes an integral part of carbon – combining theory and experiment to understand the zeolite-like water adsorption properties of porous C<sub>2</sub>N materials}}},
  doi          = {{10.1039/d1ta05122a}},
  volume       = {{9}},
  year         = {{2021}},
}

@inproceedings{21509,
  author       = {{Müller, Stefanie Jutta Marianne and Kundisch, Dennis}},
  location     = {{Virtual Conference/Workshop}},
  title        = {{{Gesellschaftliche Transformationen durch die Steigerung (popmusik)kultureller Teil-habe mittels innovativer Preiskonzepte – ein interdisziplinärer Literaturüberblick}}},
  year         = {{2021}},
}

@article{33895,
  abstract     = {{<jats:p>Heat-assisted forming processes are becoming increasingly important in the manufacturing of sheet metal parts for body-in-white applications. However, the non-isothermal nature of these processes leads to challenges in evaluating the forming limits, since established methods such as Forming Limit Curves (FLCs) only allow the assessment of critical forming strains for steady temperatures. For this reason, a temperature-dependent extension of the well-established GISSMO (Generalized Incremental Stress State Dependent Damage Model) fracture indicator framework is developed by the authors to predict forming failures under non-isothermal conditions. In this paper, a general approach to combine several isothermal FLCs within the temperature-extended GISSMO model into a temperature-dependent forming limit surface is investigated. The general capabilities of the model are tested in a coupled thermo-mechanical FEA using the example of warm forming of an AA5182-O sheet metal cross-die cup. The obtained results are then compared with state of the art of evaluation methods. By taking the strain and temperature path into account, GISSMO predicts greater drawing depths by up to 20% than established methods. In this way the forming and so the lightweight potential of sheet metal parts can by fully exploited. Moreover, the risk and locus of failure can be evaluated directly on the part geometry by a contour plot. An additional advantage of the GISSMO model is the applicability for low triaxialities as well as the possibility to predict the materials behavior beyond necking up to ductile fracture.</jats:p>}},
  author       = {{Camberg, Alan Adam and Erhart, Tobias and Tröster, Thomas}},
  issn         = {{1996-1944}},
  journal      = {{Materials}},
  keywords     = {{General Materials Science}},
  number       = {{17}},
  publisher    = {{MDPI AG}},
  title        = {{{A Generalized Stress State and Temperature Dependent Damage Indicator Framework for Ductile Failure Prediction in Heat-Assisted Forming Operations}}},
  doi          = {{10.3390/ma14175106}},
  volume       = {{14}},
  year         = {{2021}},
}

@article{30698,
  author       = {{Gröger, B. and Köhler, D. and Vorderbrüggen, J. and Troschitz, J. and Kupfer, R. and Meschut, G. and Gude, M.}},
  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{30699,
  author       = {{Weiß, D. and Schramm, B. and Kullmer, G.}},
  journal      = {{Production Engineering}},
  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{30701,
  author       = {{Römisch, D. and Popp, J. and Drummer, D. and Merklein, M.}},
  journal      = {{Production Engineering}},
  title        = {{{Joining of CFRT-steel hybrid parts via hole-forming and subsequent pin caulking}}},
  doi          = {{10.1007/s11740-021-01093-9}},
  year         = {{2021}},
}

@article{30684,
  abstract     = {{Due to stricter emission targets in the mobility sector and the resulting trend towards lightweight construction in order to reduce weight and consequently emissions, multi-material systems that allow a material to be placed in the right quantity and in the right place are becoming increasingly important. One major challenge that is holding back the rapid and widespread use of multi-material systems is the lack of adequate joining processes that are suitable for joining dissimilar materials. Joining processes without auxiliary elements have the advantage of a reduced assembly effort and no additional added weight. Conventional joining processes without auxiliary elements, such as welding, clinching, or the use of adhesives, reach their limits due to different mechanical properties and chemical incompatibilities. A process with potential in the field of joining dissimilar materials is joining without an auxiliary element using pin structures. However, current pin manufacturing processes are mostly time-consuming or can only be integrated barely into existing industrial manufacturing processes due to their specific properties. For this reason, the present work investigates the production of single- and multi-pin structures from high-strength dual-phase steel HCT590X + Z (DP600, t0 = 1.5 mm) by cold extrusion directly out of the sheet metal. These structures are subsequently joined with an aluminium sheet (EN AW-6014-T4, t0 = 1.5 mm) by direct pin pressing. For a quantitative evaluation of the joint quality, tensile shear tests are carried out and the influence of different pin heights, pin number, and pin arrangements, as well as different joining strategies on the joint strength is experimentally evaluated. It is proven that a single pin structure with a diameter of 1.5 mm and an average height of 1.86 mm achieves a maximum tensile shear force of 1025 N. The results reveal that the formation of a form-fit during direct pin pressing is essential for the joint strength. By increasing the number of pins, a linear increase in force could be demonstrated, which is independent of the arrangement of the pin structures.}},
  author       = {{Römisch, D. and Kraus, M. and Merklein, M.}},
  journal      = {{Journal of Manufacturing and Materials Processing}},
  pages        = {{25}},
  title        = {{{Experimental study on joining by forming of hct590x + z and en-aw 6014 sheets using cold extruded pin structures}}},
  doi          = {{10.3390/jmmp5010025}},
  volume       = {{5}},
  year         = {{2021}},
}

@article{30682,
  abstract     = {{Lightweight constructions become more and more important, especially in the mobility sector. In this industry, the increasingly strict regulations regarding the emissions of carbon dioxide can be achieved to a certain extent by reducing the vehicle weight. Thus, multi-material systems are used. Conventional joining techniques reach their limits when joining different materials due to different thermal expansion, unequal stiffness or chemical incompatibilities. This is why additional joining elements or adhesives are used. These must be viewed critically regarding a lightweight and resource-efficient production, since they add weight or complicate the recycling process of these components. Consequently, there is a great and growing need for new versatile joining technologies in order to overcome these challenges and to be able to react to changing process parameters and boundary conditions. Joining without an auxiliary element using pin structures formed directly from the sheet metal plane is one approach to meet these challenges. These pin structures are then joined by direct pressing into the joining partner. This is possible with a variety of material combinations, but is advantageous with regard to continuous fibre-reinforced thermoplastic composites (CFRTP), as the fibres do not have to be cut when joining CFRTP using pin structures. In this paper, the formability of pin structures made of a dual-phase steel DP600 (HCT590X + Z) is investigated. The extruded pin structures are joined by direct pin pressing with an EN AW-6014 to form tensile shear specimens. Different joining strategies are investigated to compare their influence on the joint strength. The results have shown that it is feasible to form suitable pins from a DP600 dual-phase steel to produce reliable connections with an aluminium sheet joined by direct pin pressing. }},
  author       = {{Römisch, D. and Kraus, M. and Merklein, M.}},
  journal      = {{Key Engineering Materials}},
  pages        = {{19--26}},
  title        = {{{Investigation of Different Joining by Forming Strategies when Connecting Different Metals without Auxiliary Elements}}},
  doi          = {{10.4028/www.scientific.net/kem.883.19}},
  volume       = {{883}},
  year         = {{2021}},
}