@phdthesis{Drescher,
  author    = {Drescher, Marcel},
  title     = {Open Innovation in KMU - Eine empirische Analyse der offenen Innovationsaktivit{\"a}ten im Kontext der Entrepreneurial Orientation},
  doi       = {10.25643/bauhaus-universitaet.4946},
  url       = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20230314-49463},
  school      = {Bauhaus-Universit{\"a}t Weimar},
  pages     = {211},
  abstract  = {Open Innovation in kleinen und mittleren Unternehmen (KMU) hat sich stark ausdifferenziert. Dabei zeigt die Empirie, dass KMU unterschiedliche Wege in der offenen Entwicklung von Innovationen begehen. Um die bestehende Literatur zu erweitern, wurden mit dieser Dissertation die Ziele verfolgt 1) offene Innovationsaktivit{\"a}ten in KMU aus einer Prozessperspektive aufzudecken und genau zu beschreiben und 2) zu erkl{\"a}ren, warum sich die {\"O}ffnung von Innovationsprozessen in KMU unterscheidet. Daf{\"u}r wurde auf eine multiple Fallstudienanalyse zur{\"u}ckgegriffen. Untersuchungsobjekte waren kleine etablierte High-Tech Unternehmen aus den neuen Bundesl{\"a}ndern. Die Ergebnisse zeigen sechs Prozessmodelle der offenen Innovationsentwicklung, beschrieben als Open Innovation Muster. Deskriptionen dieser Muster unter Ber{\"u}cksichtigung von formenden Innovationsaktivit{\"a}ten, ausgetauschtem Wissen, beteiligten externen Akteuren und Gr{\"u}nden f{\"u}r und gegen Open Innovation vermitteln ein {\"u}ber den bisherigen Forschungsstand hinausgehendes Verst{\"a}ndnis von Open Innovation in KMU. Zudem zeigen die Ergebnisse, dass die Entrepreneurial Orientation erkl{\"a}rt, warum KMU bei der Ausgestaltung von offenen Innovationsprozessen unterschiedlich vorgehen. In der Dissertation wird detailliert dargelegt, welche Open Innovation Muster sich anhand der Entrepreneurial Orientation von KMU (nicht-entrepreneurial bis entrepreneurial) zeigen. Die Ergebnisse liefern sowohl wissenschaftliche Implikationen, als auch Handlungsempfehlungen f{\"u}r die Unternehmenspraxis.},
  subject      = {Open Innovation},
  language  = {de}
}
@article{MoscosoKraus,
  author    = {Moscoso, Caridad and Kraus, Matthias},
  title     = {On the Verification of Beams Subjected to Lateral Torsional Buckling by Simplified Plastic Structural Analysis},
  series = {ce/papers},
  volume    = {2022},
  journal   = {ce/papers},
  number    = {Volume 5, Issue 4},
  publisher = {Ernst \& Sohn},
  address   = {Berlin},
  doi       = {10.1002/cepa.1835},
  url       = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20230124-48782},
  pages     = {914 -- 923},
  abstract  = {Plastic structural analysis may be applied without any difficulty and with little effort for structural member verifications with regard to lateral torsional buckling of doubly symmetric rolled I sections. Suchlike analyses can be performed based on the plastic zone theory, specifically using finite beam elements with seven degrees of freedom and 2nd order theory considering material nonlinearity. The existing Eurocode enables these approaches and the coming-up generation will provide corresponding regulations in EN 1993-1-14. The investigations allow the determination of computationally accurate limit loads, which are determined in the present paper for selected structural systems with different sets of parameters, such as length, steel grade and cross section types. The results are compared to approximations gained by more sophisticated FEM analyses (commercial software Ansys Workbench applying solid elements) for reasons of verification/validation. In this course, differences in the results of the numerical models are addressed and discussed. In addition, results are compared to resistances obtained by common design regulations based on reduction factors χlt including regulations of EN 1993-1-1 (including German National Annex) as well as prEN 1993-1-1: 2020-08 (proposed new Eurocode generation). Concluding, correlations of results and their advantages as well as disadvantages are discussed.},
  subject      = {Stahl},
  language  = {en}
}
@article{ArnoldKraus,
  author    = {Arnold, Robert and Kraus, Matthias},
  title     = {On the nonstationary identification of climate-influenced loads for the semi-probabilistic approach using measured and projected data},
  series = {Cogent Engineering},
  volume    = {2022},
  journal   = {Cogent Engineering},
  number    = {Volume 9, issue 1, article 2143061},
  editor    = {Pham, Duc},
  publisher = {Taylor \& Francis},
  address   = {London},
  doi       = {10.1080/23311916.2022.2143061},
  url       = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20221117-47363},
  pages     = {1 -- 26},
  abstract  = {A safe and economic structural design based on the semi-probabilistic concept requires statistically representative safety elements, such as characteristic values, design values, and partial safety factors. Regarding climate loads, the safety levels of current design codes strongly reflect experiences based on former measurements and investigations assuming stationary conditions, i.e. involving constant frequencies and intensities. However, due to climate change, occurrence of corresponding extreme weather events is expected to alter in the future influencing the reliability and safety of structures and their components. Based on established approaches, a systematically refined data-driven methodology for the determination of design parameters considering nonstationarity as well as standardized targets of structural reliability or safety, respectively, is therefore proposed. The presented procedure picks up fundamentals of European standardization and extends them with respect to nonstationarity by applying a shifting time window method. Taking projected snow loads into account, the application of the method is exemplarily demonstrated and various influencing parameters are discussed.},
  subject      = {Reliabilit{\"a}t},
  language  = {en}
}
@article{ArtusKoch,
  author    = {Artus, Mathias and Koch, Christian},
  title     = {Object-Oriented Damage Information Modeling Concepts and Implementation for Bridge Inspection},
  series = {Journal of Computing in Civil Engineering},
  volume    = {2022},
  journal   = {Journal of Computing in Civil Engineering},
  number    = {Volume 36, issue 6},
  doi       = {10.1061/(ASCE)CP.1943-5487.0001030},
  url       = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20220826-47087},
  pages     = {1 -- 21},
  abstract  = {Bridges are designed to last for more than 50 years and consume up to 50\% of their life-cycle costs during their operation phase. Several inspections and assessment actions are executed during this period. Bridge and damage information must be gathered, digitized, and exchanged between different stakeholders. Currently, the inspection and assessment practices rely on paper-based data collection and exchange, which is time-consuming and error-prone, and leads to loss of information. Storing and exchanging damage and building information in a digital format may lower costs and errors during inspection and assessment and support future needs, for example, immediate simulations regarding performance assessment, automated maintenance planning, and mixed reality inspections. This study focused on the concept for modeling damage information to support bridge reviews and structural analysis. Starting from the definition of multiple use cases and related requirements, the data model for damage information is defined independently from the subsequent implementation. In the next step, the implementation via an established standard is explained. Functional tests aim to identify problems in the concept and implementation. To show the capability of the final model, two example use cases are illustrated: the inspection review of the entire bridge and a finite-element analysis of a single component. Main results are the definition of necessary damage data, an object-oriented damage model, which supports multiple use cases, and the implementation of the model in a standard. Furthermore, the tests have shown that the standard is suitable to deliver damage information; however, several software programs lack proper implementation of the standard.},
  subject      = {Building Information Modeling},
  language  = {en}
}
@phdthesis{Zacharias,
  author    = {Zacharias, Christin},
  title     = {Numerical Simulation Models for Thermoelastic Damping Effects},
  doi       = {10.25643/bauhaus-universitaet.4735},
  url       = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20221116-47352},
  school      = {Bauhaus-Universit{\"a}t Weimar},
  pages     = {191},
  abstract  = {Finite Element Simulations of dynamically excited structures are mainly influenced by the mass, stiffness, and damping properties of the system, as well as external loads. The prediction quality of dynamic simulations of vibration-sensitive components depends significantly on the use of appropriate damping models. Damping phenomena have a decisive influence on the vibration amplitude and the frequencies of the vibrating structure. However, developing realistic damping models is challenging due to the multiple sources that cause energy dissipation, such as material damping, different types of friction, or various interactions with the environment. This thesis focuses on thermoelastic damping, which is the main cause of material damping in homogeneous materials. The effect is caused by temperature changes due to mechanical strains. In vibrating structures, temperature gradients arise in adjacent tension and compression areas. Depending on the vibration frequency, they result in heat flows, leading to increased entropy and the irreversible transformation of mechanical energy into thermal energy. The central objective of this thesis is the development of efficient simulation methods to incorporate thermoelastic damping in finite element analyses based on modal superposition. The thermoelastic loss factor is derived from the structure's mechanical mode shapes and eigenfrequencies. In subsequent analyses that are performed in the time and frequency domain, it is applied as modal damping. Two approaches are developed to determine the thermoelastic loss in thin-walled plate structures, as well as three-dimensional solid structures. The realistic representation of the dissipation effects is verified by comparing the simulation results with experimentally determined data. Therefore, an experimental setup is developed to measure material damping, excluding other sources of energy dissipation. The three-dimensional solid approach is based on the determination of the generated entropy and therefore the generated heat per vibration cycle, which is a measure for thermoelastic loss in relation to the total strain energy. For thin plate structures, the amount of bending energy in a modal deformation is calculated and summarized in the so-called Modal Bending Factor (MBF). The highest amount of thermoelastic loss occurs in the state of pure bending. Therefore, the MBF enables a quantitative classification of the mode shapes concerning the thermoelastic damping potential. The results of the developed simulations are in good agreement with the experimental results and are appropriate to predict thermoelastic loss factors. Both approaches are based on modal superposition with the advantage of a high computational efficiency. Overall, the modeling of thermoelastic damping represents an important component in a comprehensive damping model, which is necessary to perform realistic simulations of vibration processes.},
  subject      = {Werkstoffd{\"a}mpfung},
  language  = {en}
}
@article{Zhang,
  author    = {Zhang, Yongzheng},
  title     = {Nonlocal dynamic Kirchhoff plate formulation based on nonlocal operator method},
  series = {Engineering with Computers},
  volume    = {2022},
  journal   = {Engineering with Computers},
  publisher = {Springer},
  address   = {London},
  doi       = {10.1007/s00366-021-01587-1},
  url       = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20220209-45849},
  pages     = {1 -- 35},
  abstract  = {In this study, we propose a nonlocal operator method (NOM) for the dynamic analysis of (thin) Kirchhoff plates. The nonlocal Hessian operator is derived based on a second-order Taylor series expansion. The NOM does not require any shape functions and associated derivatives as 'classical' approaches such as FEM, drastically facilitating the implementation. Furthermore, NOM is higher order continuous, which is exploited for thin plate analysis that requires C1 continuity. The nonlocal dynamic governing formulation and operator energy functional for Kirchhoff plates are derived from a variational principle. The Verlet-velocity algorithm is used for the time discretization. After confirming the accuracy of the nonlocal Hessian operator, several numerical examples are simulated by the nonlocal dynamic Kirchhoff plate formulation.},
  subject      = {Angewandte Mathematik},
  language  = {en}
}
@phdthesis{CarvajalBermudez,
  author    = {Carvajal Berm{\´u}dez, Juan Carlos},
  title     = {New methods of citizen participation based on digital technologies},
  doi       = {10.25643/bauhaus-universitaet.4712},
  url       = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20220906-47124},
  school      = {Bauhaus-Universit{\"a}t Weimar},
  abstract  = {The current thesis presents research about new methods of citizen participation based on digital technologies. The focus on the research lies on decentralized methods of participation where citizens take the role of co-creators. The research project first conducted a review of the literature on citizen participation, its origins and the different paradigms that have emerged over the years. The literature review also looked at the influence of technologies on participation processes and the theoretical frameworks that have emerged to understand the introduction of technologies in the context of urban development. The literature review generated the conceptual basis for the further development of the thesis. The research begins with a survey of technology enabled participation applications that examined the roles and structures emerging due to the introduction of technology. The results showed that cities use technology mostly to control and monitor urban infrastructure and are rather reluctant to give citizens the role of co-creators. Based on these findings, three case studies were developed. Digital tools for citizen participation were conceived and introduced for each case study. The adoption and reaction of the citizens were observed using three data collection methods. The results of the case studies showed consistently that previous participation and engagement with informal citizen participation are a determinining factor in the potential adoption of digital tools for decentralized engagement. Based on these results, the case studies proposed methods and frameworks that can be used for the conception and introduction of technologies for decentralized citizen participation.},
  subject      = {Partizipation},
  language  = {en}
}
@phdthesis{Hartmann,
  author    = {Hartmann, Veronika},
  title     = {Methoden zur Quantifizierung und Optimierung der Robustheit von Bauablaufpl{\"a}nen},
  doi       = {10.25643/bauhaus-universitaet.4579},
  url       = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20220204-45798},
  school      = {Bauhaus-Universit{\"a}t Weimar},
  abstract  = {Bauablaufpl{\"a}nen kommt bei der Realisierung von Bauprojekten eine zentrale Rolle zu. Sie dienen der Koordination von Schnittstellen und bilden f{\"u}r die am Projekt Beteiligten die Grundlage f{\"u}r ihre individuelle Planung. Eine verl{\"a}ssliche Terminplanung ist daher von großer Bedeutung, tats{\"a}chlich sind aber gerade Bauablaufpl{\"a}ne f{\"u}r ihre Unzuverl{\"a}ssigkeit bekannt. Aufgrund der langen Vorlaufzeiten bei der Planung von Bauprojekten sind zum Zeitpunkt der Planung viele Informationen nur als Sch{\"a}tzwerte bekannt. Auf der Grundlage dieser gesch{\"a}tzten und damit mit Unsicherheiten behafteten Daten werden im Bauwesen deterministische Terminpl{\"a}ne erstellt. Kommt es w{\"a}hrend der Realisierung zu Diskrepanzen zwischen Sch{\"a}tzungen und Realit{\"a}t, erfordert dies die Anpassung der Pl{\"a}ne. Aufgrund zahlreicher Abh{\"a}ngigkeiten zwischen den geplanten Aktivit{\"a}ten k{\"o}nnen einzelne Plan{\"a}nderungen vielf{\"a}ltige weitere {\"A}nderungen und Anpassungen nach sich ziehen und damit einen reibungslosen Projektablauf gef{\"a}hrden. In dieser Arbeit wird ein Vorgehen entwickelt, welches Bauablaufpl{\"a}ne erzeugt, die im Rahmen der durch das Projekt definierten Abh{\"a}ngigkeiten und Randbedingungen in der Lage sind, {\"A}nderungen m{\"o}glichst gut zu absorbieren. Solche Pl{\"a}ne, die bei auftretenden {\"A}nderungen vergleichsweise geringe Anpassungen des Terminplans erfordern, werden hier als robust bezeichnet. Ausgehend von Verfahren der Projektplanung und Methoden zur Ber{\"u}cksichtigung von Unsicherheiten werden deterministische Terminpl{\"a}ne bez{\"u}glich ihres Verhaltens bei eintretenden {\"A}nderungen betrachtet. Hierf{\"u}r werden zun{\"a}chst m{\"o}gliche Unsicherheiten als Ursachen f{\"u}r {\"A}nderungen benannt und mathematisch abgebildet. Damit kann das Verhalten von Abl{\"a}ufen f{\"u}r m{\"o}gliche {\"A}nderungen betrachtet werden, indem die durch {\"A}nderungen erzwungenen angepassten Terminpl{\"a}ne simuliert werden. F{\"u}r diese Monte-Carlo-Simulationen der angepassten Terminpl{\"a}ne wird sichergestellt, dass die angepassten Terminpl{\"a}ne logische Weiterentwicklungen des deterministischen Terminplans darstellen. Auf der Grundlage dieser Untersuchungen wird ein stochastisches Maß zur Quantifizierung der Robustheit erarbeitet, welches die F{\"a}higkeit eines Planes, {\"A}nderungen zu absorbieren, beschreibt. Damit ist es m{\"o}glich, Terminpl{\"a}ne bez{\"u}glich ihrer Robustheit zu vergleichen. Das entwickelte Verfahren zur Quantifizierung der Robustheit wird in einem Optimierungsverfahren auf Basis Genetischer Algorithmen angewendet, um gezielt robuste Terminpl{\"a}ne zu erzeugen. An Beispielen werden die Methoden demonstriert und ihre Wirksamkeit nachgewiesen.},
  subject      = {Bauablaufplanung},
  language  = {de}
}
@article{BuschowSuhrSerger,
  author    = {Buschow, Christopher and Suhr, Maike and Serger, Hauke},
  title     = {Media Work as Field Advancement: The Case of Science Media Center Germany},
  series = {Media and Communication},
  volume    = {2022},
  journal   = {Media and Communication},
  number    = {Volume 10, issue 1},
  publisher = {Cogitatio Press},
  address   = {Lisbon},
  doi       = {10.17645/mac.v10i1.4454},
  url       = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20220125-45709},
  pages     = {99 -- 109},
  abstract  = {In the wake of the news industry's digitization, novel organizations that differ considerably from traditional media firms in terms of their functional roles and organizational practices of media work are emerging. One new type is the field repair organization, which is characterized by supporting high-quality media work to compensate for the deficits (such as those which come from cost savings and layoffs) which have become apparent in legacy media today. From a practice-theoretical research perspective and based on semi-structured interviews, virtual field observations, and document analysis, we have conducted a single case study on Science Media Center Germany (SMC), a unique non-profit news start-up launched in 2016 in Cologne, Germany. Our findings show that, in addition to field repair activities, SMC aims to facilitate progress and innovation in the field, which we refer to as field advancement. This helps to uncover emerging needs and anticipates problems before they intensify or even occur, proactively providing products and tools for future journalism. This article contributes to our understanding of novel media organizations with distinct functions in the news industry, allowing for advancements in theory on media work and the organization of journalism in times of digital upheaval.},
  subject      = {Journalismus},
  language  = {en}
}
@phdthesis{Nouri,
  author    = {Nouri, Hamidreza},
  title     = {Mechanical Behavior of two dimensional sheets and polymer compounds based on molecular dynamics and continuum mechanics approach},
  doi       = {10.25643/bauhaus-universitaet.4670},
  url       = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20220713-46700},
  school      = {Bauhaus-Universit{\"a}t Weimar},
  pages     = {152},
  abstract  = {Compactly, this thesis encompasses two major parts to examine mechanical responses of polymer compounds and two dimensional materials: 1- Molecular dynamics approach is investigated to study transverse impact behavior of polymers, polymer compounds and two dimensional materials. 2- Large deflection of circular and rectangular membranes is examined by employing continuum mechanics approach. Two dimensional materials (2D), including, Graphene and molybdenum disulfide (MoS2), exhibited new and promising physical and chemical properties, opening new opportunities to be utilized alone or to enhance the performance of conventional materials. These 2D materials have attracted tremendous attention owing to their outstanding physical properties, especially concerning transverse impact loading. Polymers, with the backbone of carbon (organic polymers) or do not include carbon atoms in the backbone (inorganic polymers) like polydimethylsiloxane (PDMS), have extraordinary characteristics particularly their flexibility leads to various easy ways of forming and casting. These simple shape processing label polymers as an excellent material often used as a matrix in composites (polymer compounds). In this PhD work, Classical Molecular Dynamics (MD) is implemented to calculate transverse impact loading of 2D materials as well as polymer compounds reinforced with graphene sheets. In particular, MD was adopted to investigate perforation of the target and impact resistance force . By employing MD approach, the minimum velocity of the projectile that could create perforation and passes through the target is obtained. The largest investigation was focused on how graphene could enhance the impact properties of the compound. Also the purpose of this work was to discover the effect of the atomic arrangement of 2D materials on the impact problem. To this aim, the impact properties of two different 2D materials, graphene and MoS2, are studied. The simulation of chemical functionalization was carried out systematically, either with covalently bonded molecules or with non-bonded ones, focusing the following efforts on the covalently bounded species, revealed as the most efficient linkers. To study transverse impact behavior by using classical MD approach , Large-scale Atomic/Molecular Massively Parallel Simulator (LAMMPS) software, that is well-known among most researchers, is employed. The simulation is done through predefined commands in LAMMPS. Generally these commands (atom style, pair style, angle style, dihedral style, improper style, kspace style, read data, fix, run, compute and so on) are used to simulate and run the model for the desired outputs. Depends on the particles and model types, suitable inter-atomic potentials (force fields) are considered. The ensembles, constraints and boundary conditions are applied depends upon the problem definition. To do so, atomic creation is needed. Python codes are developed to generate particles which explain atomic arrangement of each model. Each atomic arrangement introduced separately to LAMMPS for simulation. After applying constraints and boundary conditions, LAMMPS also include integrators like velocity-Verlet integrator or Brownian dynamics or other types of integrator to run the simulation and finally the outputs are emerged. The outputs are inspected carefully to appreciate the natural behavior of the problem. Appreciation of natural properties of the materials assist us to design new applicable materials. In investigation on the large deflection of circular and rectangular membranes, which is related to the second part of this thesis, continuum mechanics approach is implemented. Nonlinear F{\"o}ppl membrane theory, which carefully release nonlinear governing equations of motion, is considered to establish the non-linear partial differential equilibrium equations of the membranes under distributed and centric point loads. The Galerkin and energy methods are utilized to solve non-linear partial differential equilibrium equations of circular and rectangular plates respectively. Maximum deflection as well as stress through the film region, which are kinds of issue in many industrial applications, are obtained.},
  subject      = {Molekulardynamik},
  language  = {en}
}
@misc{RaabMueller,
  author    = {Raab, Susanna and M{\"u}ller, Hannah},
  title     = {LebensMittelPunkte schaffen in Kooperation! Ein Handlungsleitfaden f{\"u}r die Zusammenarbeit von bezirklicher Verwaltung und ern{\"a}hrungspolitischen Initiativen},
  doi       = {10.25643/bauhaus-universitaet.4734},
  url       = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20221109-47347},
  pages     = {10},
  abstract  = {Zugang zu gesunder und nachhaltiger Ern{\"a}hrung ist in Berlin nicht f{\"u}r alle Menschen eine Selbstverst{\"a}ndlichkeit. Um Ern{\"a}hrung f{\"u}r alle gew{\"a}hrleisten zu k{\"o}nnen, braucht es einen Wandel des Ern{\"a}hrungssystems in Berlin, der eine {\"o}kologische, klima- und sozialgerechte Nahrungsproduktion und Verteilung f{\"u}r alle Menschen in der Stadt erm{\"o}glicht. Einen Beitrag um die Ern{\"a}hrung in der Stadt gerechter und nachhaltiger zu gestalten kann ein sogenannter LebensMittelPunkt (LMP) leisten. LebensMittelPunkte entstehen meist aus ehrenamtlichen Initiativen, k{\"o}nnen aber auch in Zusammenarbeit mit st{\"a}dtischen Verwaltungen etabliert werden. Eine Zusammenarbeit zwischen zivilgesellschaftlichen Organisationen und Verwaltungen kann dabei Potenziale und Ressourcen freisetzen. Dieser Leitfaden soll ern{\"a}hrungspolitischen Initiativen und Vereinen aus der Zivilgesellschaft sowie kommunalen oder bezirklichen Verwaltungen in Berlin - und dar{\"u}ber hinaus - Empfehlungen geben, wie ein LebensMittelPunkt in einer gemeinsamen Kooperation aufgebaut werden kann.},
  subject      = {Ern{\"a}hrung},
  language  = {de}
}
@phdthesis{Wang,
  author    = {Wang, Jiasheng},
  title     = {Lebensdauerabsch{\"a}tzung von Bauteilen aus globularem Grauguss auf der Grundlage der lokalen gießprozessabh{\"a}ngigen Werkstoffzust{\"a}nde},
  doi       = {10.25643/bauhaus-universitaet.4554},
  url       = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20220111-45542},
  school      = {Bauhaus-Universit{\"a}t Weimar},
  pages     = {165},
  abstract  = {Das Ziel der Arbeit ist, eine m{\"o}gliche Verbesserung der G{\"u}te der Lebensdauervorhersage f{\"u}r Gusseisenwerkstoffe mit Kugelgraphit zu erreichen, wobei die Gießprozesse verschiedener Hersteller ber{\"u}cksichtigt werden. Im ersten Schritt wurden Probenk{\"o}rper aus GJS500 und GJS600 von mehreren Gusslieferanten gegossen und daraus Schwingproben erstellt. Insgesamt wurden Schwingfestigkeitswerte der einzelnen gegossenen Proben sowie der Proben des Bauteils von verschiedenen Gussherstellern weltweit entweder durch direkte Schwingversuche oder durch eine Sammlung von Betriebsfestigkeitsversuchen bestimmt. Dank der metallografischen Arbeit und Korrelationsanalyse konnten drei wesentliche Parameter zur Bestimmung der lokalen Dauerfestigkeit festgestellt werden: 1. statische Festigkeit, 2. Ferrit- und Perlitanteil der Mikrostrukturen und 3. Kugelgraphitanzahl pro Fl{\"a}cheneinheit. Basierend auf diesen Erkenntnissen wurde ein neues Festigkeitsverh{\"a}ltnisdiagramm (sogenanntes Sd/Rm-SG-Diagramm) entwickelt. Diese neue Methodik sollte vor allem erm{\"o}glichen, die Bauteildauerfestigkeit auf der Grundlage der gemessenen oder durch eine Gießsimulation vorhersagten lokalen Zugfestigkeitswerte sowie Mikrogef{\"u}genstrukturen besser zu prognostizieren. Mithilfe der Versuche sowie der Gießsimulation ist es gelungen, unterschiedliche Methoden der Lebensdauervorhersage unter Ber{\"u}cksichtigung der Herstellungsprozesse weiterzuentwickeln.},
  subject      = {Grauguss},
  language  = {de}
}
@article{Morawski,
  author    = {Morawski, Tommaso},
  title     = {La tavola e la mappa. Paradigmi per una metaforologia mediale dell'immaginazione cartografica in Kant},
  series = {Philosophy Kitchen},
  volume    = {2022},
  journal   = {Philosophy Kitchen},
  number    = {17, II/2022},
  publisher = {Universit{\`a} degli Studi di Torino},
  address   = {Turino},
  doi       = {10.13135/2385-1945/7191},
  url       = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20230124-48766},
  pages     = {137 -- 152},
  abstract  = {Immanuel Kant's thought is a central historical and theoretical reference in Hans Blumenberg's metaphorological project. This is demonstrated by the fact that in the Paradigms the author outlines the concept of absolute metaphor by explicitly referring to \S59 of the Critique of the Power of Judgment and recognizing in the Kantian symbol a model for his own metaphorics. However, Kant's name also appears in the chapter on the metaphor of the "terra incognita" that not only did he theorize the presence of symbolic hypotyposis in our language [...] but also made extensive use of metaphors linked to "determinate historical experiences". In particular: geographical metaphors. In my essay, I would like to start from the analysis of Kant's geographical metaphors in order to try to rethink Blumenberg's archaeological method as an archaeology of media that grounds the study of metaphors in the materiality of communication and the combination of tools, agents and media.},
  subject      = {Kant, Immanuel},
  language  = {it}
}
@phdthesis{ShaabanMohamed,
  author    = {Shaaban Mohamed, Ahmed Mostafa},
  title     = {Isogeometric boundary element analysis and structural shape optimization for Helmholtz acoustic problems},
  doi       = {10.25643/bauhaus-universitaet.4703},
  url       = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20220816-47030},
  school      = {Bauhaus-Universit{\"a}t Weimar},
  abstract  = {In this thesis, a new approach is developed for applications of shape optimization on the time harmonic wave propagation (Helmholtz equation) for acoustic problems. This approach is introduced for different dimensional problems: 2D, 3D axi-symmetric and fully 3D problems. The boundary element method (BEM) is coupled with the isogeometric analysis (IGA) forming the so-called (IGABEM) which speeds up meshing and gives higher accuracy in comparison with standard BEM. BEM is superior for handling unbounded domains by modeling only the inner boundaries and avoiding the truncation error, present in the finite element method (FEM) since BEM solutions satisfy the Sommerfeld radiation condition automatically. Moreover, BEM reduces the space dimension by one from a volumetric three-dimensional problem to a surface two-dimensional problem, or from a surface two-dimensional problem to a perimeter one-dimensional problem. Non-uniform rational B-splines basis functions (NURBS) are used in an isogeometric setting to describe both the CAD geometries and the physical fields. IGABEM is coupled with one of the gradient-free optimization methods, the Particle Swarm Optimization (PSO) for structural shape optimization problems. PSO is a straightforward method since it does not require any sensitivity analysis but it has some trade-offs with regard to the computational cost. Coupling IGA with optimization problems enables the NURBS basis functions to represent the three models: shape design, analysis and optimization models, by a definition of a set of control points to be the control variables and the optimization parameters as well which enables an easy transition between the three models. Acoustic shape optimization for various frequencies in different mediums is performed with PSO and the results are compared with the benchmark solutions from the literature for different dimensional problems proving the efficiency of the proposed approach with the following remarks: - In 2D problems, two BEM methods are used: the conventional isogeometric boundary element method (IGABEM) and the eXtended IGABEM (XIBEM) enriched with the partition-of-unity expansion using a set of plane waves, where the results are generally in good agreement with the linterature with some computation advantage to XIBEM which allows coarser meshes. -In 3D axi-symmetric problems, the three-dimensional problem is simplified in BEM from a surface integral to a combination of two 1D integrals. The first is the line integral similar to a two-dimensional BEM problem. The second integral is performed over the angle of revolution. The discretization is applied only to the former integration. This leads to significant computational savings and, consequently, better treatment for higher frequencies over the full three-dimensional models. - In fully 3D problems, a detailed comparison between two BEM methods: the conventional boundary integral equation (CBIE) and Burton-Miller (BM) is provided including the computational cost. The proposed models are enhanced with a modified collocation scheme with offsets to Greville abscissae to avoid placing collocation points at the corners. Placing collocation points on smooth surface enables accurate evaluation of normals for BM formulation in addition to straightforward prediction of jump-terms and avoids singularities in \$\mathcal{O} (1/r)\$ integrals eliminating the need for polar integration. Furthermore, no additional special treatment is required for the hyper-singular integral while collocating on highly distorted elements, such as those containing sphere poles. The obtained results indicate that, CBIE with PSO is a feasible alternative (except for a small number of fictitious frequencies) which is easier to implement. Furthermore, BM presents an outstanding treatment of the complicated geometry of mufflers with internal extended inlet/outlet tube as an interior 3D Helmholtz acoustic problem instead of using mixed or dual BEM.},
  subject      = {Randelemente-Methode},
  language  = {en}
}
@phdthesis{LopezZermeno,
  author    = {L{\´o}pez Zerme{\~n}o, Jorge Alberto},
  title     = {Isogeometric and CAD-based methods for shape and topology optimization: Sensitivity analysis, B{\´e}zier elements and phase-field approaches},
  doi       = {10.25643/bauhaus-universitaet.4710},
  url       = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20220831-47102},
  school      = {Bauhaus-Universit{\"a}t Weimar},
  abstract  = {The Finite Element Method (FEM) is widely used in engineering for solving Partial Differential Equations (PDEs) over complex geometries. To this end, it is required to provide the FEM software with a geometric model that is typically constructed in a Computer-Aided Design (CAD) software. However, FEM and CAD use different approaches for the mathematical description of the geometry. Thus, it is required to generate a mesh, which is suitable for FEM, based on the CAD model. Nonetheless, this procedure is not a trivial task and it can be time consuming. This issue becomes more significant for solving shape and topology optimization problems, which consist in evolving the geometry iteratively. Therefore, the computational cost associated to the mesh generation process is increased exponentially for this type of applications. The main goal of this work is to investigate the integration of CAD and CAE in shape and topology optimization. To this end, numerical tools that close the gap between design and analysis are presented. The specific objectives of this work are listed below: • Automatize the sensitivity analysis in an isogeometric framework for applications in shape optimization. Applications for linear elasticity are considered. • A methodology is developed for providing a direct link between the CAD model and the analysis mesh. In consequence, the sensitivity analysis can be performed in terms of the design variables located in the design model. • The last objective is to develop an isogeometric method for shape and topological optimization. This method should take advantage of using Non-Uniform Rational B-Splines (NURBS) with higher continuity as basis functions. Isogeometric Analysis (IGA) is a framework designed to integrate the design and analysis in engineering problems. The fundamental idea of IGA is to use the same basis functions for modeling the geometry, usually NURBS, for the approximation of the solution fields. The advantage of integrating design and analysis is two-fold. First, the analysis stage is more accurate since the system of PDEs is not solved using an approximated geometry, but the exact CAD model. Moreover, providing a direct link between the design and analysis discretizations makes possible the implementation of efficient sensitivity analysis methods. Second, the computational time is significantly reduced because the mesh generation process can be avoided. Sensitivity analysis is essential for solving optimization problems when gradient-based optimization algorithms are employed. Automatic differentiation can compute exact gradients, automatically by tracking the algebraic operations performed on the design variables. For the automation of the sensitivity analysis, an isogeometric framework is used. Here, the analysis mesh is obtained after carrying out successive refinements, while retaining the coarse geometry for the domain design. An automatic differentiation (AD) toolbox is used to perform the sensitivity analysis. The AD toolbox takes the code for computing the objective and constraint functions as input. Then, using a source code transformation approach, it outputs a code for computing the objective and constraint functions, and their sensitivities as well. The sensitivities obtained from the sensitivity propagation method are compared with analytical sensitivities, which are computed using a full isogeometric approach. The computational efficiency of AD is comparable to that of analytical sensitivities. However, the memory requirements are larger for AD. Therefore, AD is preferable if the memory requirements are satisfied. Automatic sensitivity analysis demonstrates its practicality since it simplifies the work of engineers and designers. Complex geometries with sharp edges and/or holes cannot easily be described with NURBS. One solution is the use of unstructured meshes. Simplex-elements (triangles and tetrahedra for two and three dimensions respectively) are particularly useful since they can automatically parameterize a wide variety of domains. In this regard, unstructured B{\´e}zier elements, commonly used in CAD, can be employed for the exact modelling of CAD boundary representations. In two dimensions, the domain enclosed by NURBS curves is parameterized with B{\´e}zier triangles. To describe exactly the boundary of a two-dimensional CAD model, the continuity of a NURBS boundary representation is reduced to C^0. Then, the control points are used to generate a triangulation such that the boundary of the domain is identical to the initial CAD boundary representation. Thus, a direct link between the design and analysis discretizations is provided and the sensitivities can be propagated to the design domain. In three dimensions, the initial CAD boundary representation is given as a collection of NURBS surfaces that enclose a volume. Using a mesh generator (Gmsh), a tetrahedral mesh is obtained. The original surface is reconstructed by modifying the location of the control points of the tetrahedral mesh using B{\´e}zier tetrahedral elements and a point inversion algorithm. This method offers the possibility of computing the sensitivity analysis using the analysis mesh. Then, the sensitivities can be propagated into the design discretization. To reuse the mesh originally generated, a moving B{\´e}zier tetrahedral mesh approach was implemented. A gradient-based optimization algorithm is employed together with a sensitivity propagation procedure for the shape optimization cases. The proposed shape optimization approaches are used to solve some standard benchmark problems in structural mechanics. The results obtained show that the proposed approach can compute accurate gradients and evolve the geometry towards optimal solutions. In three dimensions, the moving mesh approach results in faster convergence in terms of computational time and avoids remeshing at each optimization step. For considering topological changes in a CAD-based framework, an isogeometric phase-field based shape and topology optimization is developed. In this case, the diffuse interface of a phase-field variable over a design domain implicitly describes the boundaries of the geometry. The design variables are the local values of the phase-field variable. The descent direction to minimize the objective function is found by using the sensitivities of the objective function with respect to the design variables. The evolution of the phase-field is determined by solving the time dependent Allen-Cahn equation. Especially for topology optimization problems that require C^1 continuity, such as for flexoelectric structures, the isogeometric phase field method is of great advantage. NURBS can achieve the desired continuity more efficiently than the traditional employed functions. The robustness of the method is demonstrated when applied to different geometries, boundary conditions, and material configurations. The applications illustrate that compared to piezoelectricity, the electrical performance of flexoelectric microbeams is larger under bending. In contrast, the electrical power for a structure under compression becomes larger with piezoelectricity.},
  subject      = {CAD},
  language  = {en}
}
@article{MehlingSchnabelLondong,
  author    = {Mehling, Simon and Schnabel, Tobias and Londong, J{\"o}rg},
  title     = {Investigation on Energetic Efficiency of Reactor Systems for Oxidation of Micro-Pollutants by Immobilized Active Titanium Dioxide Photocatalysis},
  series = {Water},
  volume    = {2022},
  journal   = {Water},
  number    = {Volume 14, issue 7, article 2681},
  publisher = {MDPI},
  address   = {Basel},
  doi       = {10.3390/w14172681},
  url       = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20220912-47130},
  pages     = {1 -- 15},
  abstract  = {In this work, the degradation performance for the photocatalytic oxidation of eight micropollutants (amisulpride, benzotriazole, candesartan, carbamazepine, diclofenac, gabapentin, methlybenzotriazole, and metoprolol) within real secondary effluent was investigated using three different reactor designs. For all reactor types, the influence of irradiation power on its reaction rate and energetic efficiency was investigated. Flat cell and batch reactor showed almost similar substance specific degradation behavior. Within the immersion rotary body reactor, benzotriazole and methylbenzotriazole showed a significantly lower degradation affinity. The flat cell reactor achieved the highest mean degradation rate, with half time values ranging from 5 to 64 min with a mean of 18 min, due to its high catalysts surface to hydraulic volume ratio. The EE/O values were calculated for all micro-pollutants as well as the mean degradation rate constant of each experimental step. The lowest substance specific energy per order (EE/O) values of 5 kWh/m3 were measured for benzotriazole within the batch reactor. The batch reactor also reached the lowest mean values (11.8-15.9 kWh/m3) followed by the flat cell reactor (21.0-37.0 kWh/m3) and immersion rotary body reactor (23.9-41.0 kWh/m3). Catalyst arrangement and irradiation power were identified as major influences on the energetic performance of the reactors. Low radiation intensities as well as the use of submerged catalyst arrangement allowed a reduction in energy demand by a factor of 3-4. A treatment according to existing treatment goals of wastewater treatment plants (80\% total degradation) was achieved using the batch reactor with a calculated energy demand of 7000 Wh/m3.},
  subject      = {Fotokatalyse},
  language  = {en}
}
@article{TarabenMorgenthal,
  author    = {Taraben, Jakob and Morgenthal, Guido},
  title     = {Integration and Comparison Methods for Multitemporal Image-Based 2D Annotations in Linked 3D Building Documentation},
  series = {Remote Sensing},
  volume    = {2022},
  journal   = {Remote Sensing},
  number    = {Volume 14, issue 9, article 2286},
  publisher = {MDPI},
  address   = {Basel},
  doi       = {10.3390/rs14092286},
  url       = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20220513-46488},
  pages     = {1 -- 20},
  abstract  = {Data acquisition systems and methods to capture high-resolution images or reconstruct 3D point clouds of existing structures are an effective way to document their as-is condition. These methods enable a detailed analysis of building surfaces, providing precise 3D representations. However, for the condition assessment and documentation, damages are mainly annotated in 2D representations, such as images, orthophotos, or technical drawings, which do not allow for the application of a 3D workflow or automated comparisons of multitemporal datasets. In the available software for building heritage data management and analysis, a wide range of annotation and evaluation functions are available, but they also lack integrated post-processing methods and systematic workflows. The article presents novel methods developed to facilitate such automated 3D workflows and validates them on a small historic church building in Thuringia, Germany. Post-processing steps using photogrammetric 3D reconstruction data along with imagery were implemented, which show the possibilities of integrating 2D annotations into 3D documentations. Further, the application of voxel-based methods on the dataset enables the evaluation of geometrical changes of multitemporal annotations in different states and the assignment to elements of scans or building models. The proposed workflow also highlights the potential of these methods for condition assessment and planning of restoration work, as well as the possibility to represent the analysis results in standardised building model formats.},
  subject      = {Bauwesen},
  language  = {en}
}
@periodical{BognerGourinovitchBaetal.,
  author    = {Bogner, Simone and Gourinovitch, Oxana and Ba, Claudia and Kibel, Jochen and Stapel, G{\"u}l{\c{s}}ah and Krajewsky, Georg and Fr{\"o}lich-Kulik, Maria and Masoud, Zoya and W{\"a}chter, Konstantin and H{\"a}ger, Benjamin and H{\"o}hne, Wolfram and Alberti, Sarah and Tr{\"o}tschel-Daniels, Bianka and Helas, Luise and Selitz, Lisa Marie and Torreiter, Laura},
  title     = {Instabile Konstruktionen. Interdisziplin{\"a}re Forschungen zu »Identit{\"a}t und Erbe«},
  editor    = {Bogner, Simone and Dolff-Bonek{\"a}mper, Gabi and Meier, Hans-Rudolf},
  publisher = {Bauhaus-Universit{\"a}tsverlag},
  address   = {Ilmtal-Weinstraße},
  doi       = {10.25643/bauhaus-universitaet.4606},
  url       = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20220315-46066},
  pages     = {264},
  abstract  = {Wer von Erbe im Zusammenhang mit Identit{\"a}t spricht, verspricht sich und Anderen »Kontinuit{\"a}t« und »Stabilit{\"a}t«. Das Versprechen h{\"a}lt indes nur so lange, wie sich Menschen auf die damit verbundenen Erz{\"a}hlungen einlassen. Da diese zunehmend hinterfragt werden und der Begriff »Identit{\"a}t« im politischen Raum zu einer umk{\"a}mpften Kategorie avanciert ist, werden auch die lange gehegten, gewohnten »Konstruktionen« instabil. Dies zeigt sich insbesondere in Momenten des Konflikts, der {\"u}bergriffigen Inanspruchnahme und des Verlusts. Der Titel »Instabile Konstruktionen« verweist zugleich auf die beiden Kernbereiche des Kollegs: einerseits auf Architektur und Denkmalpflege, in denen der Begriff Konstruktion sich auf bauliche Manifestationen bezieht, von denen eine gewisse Haltbarkeit und Dauerhaftigkeit erwartet wird und andererseits auf die Kultur- und Sozialwissenschaften, wo Konstruktion die soziale Herstellung symbolischer Sinnwelten meint. Ins Zentrum r{\"u}ckt so der Anspruch, die materielle Umwelt im Wechselverh{\"a}ltnis zu ihrer sozialen Gemachtheit zu verstehen.},
  subject      = {Identit{\"a}t},
  language  = {de}
}
@article{MaiwaldSchwarzKaufmannetal.,
  author    = {Maiwald, Holger and Schwarz, Jochen and Kaufmann, Christian and Langhammer, Tobias and Golz, Sebastian and Wehner, Theresa},
  title     = {Innovative Vulnerability and Risk Assessment of Urban Areas against Flood Events: Prognosis of Structural Damage with a New Approach Considering Flow Velocity},
  series = {Water},
  volume    = {2022},
  journal   = {Water},
  number    = {Volume 14, issue 18, article 2793},
  publisher = {MDPI},
  address   = {Basel},
  doi       = {10.3390/w14182793},
  url       = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20221012-47254},
  pages     = {1 -- 28},
  abstract  = {The floods in 2002 and 2013, as well as the recent flood of 2021, caused billions Euros worth of property damage in Germany. The aim of the project Innovative Vulnerability and Risk Assessment of Urban Areas against Flood Events (INNOVARU) involved the development of a practicable flood damage model that enables realistic damage statements for the residential building stock. In addition to the determination of local flood risks, it also takes into account the vulnerability of individual buildings and allows for the prognosis of structural damage. In this paper, we discuss an improved method for the prognosis of structural damage due to flood impact. Detailed correlations between inundation level and flow velocities depending on the vulnerability of the building types, as well as the number of storeys, are considered. Because reliable damage data from events with high flow velocities were not available, an innovative approach was adopted to cover a wide range of flow velocities. The proposed approach combines comprehensive damage data collected after the 2002 flood in Germany with damage data of the 2011 Tohoku earthquake tsunami in Japan. The application of the developed methods enables a reliable reinterpretation of the structural damage caused by the August flood of 2002 in six study areas in the Free State of Saxony.},
  subject      = {Bauschaden},
  language  = {en}
}
@phdthesis{Gollub,
  author    = {Gollub, Tim},
  title     = {Information Retrieval for the Digital Humanities},
  doi       = {10.25643/bauhaus-universitaet.4673},
  url       = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20220801-46738},
  school      = {Bauhaus-Universit{\"a}t Weimar},
  pages     = {177},
  abstract  = {In ten chapters, this thesis presents information retrieval technology which is tailored to the research activities that arise in the context of corpus-based digital humanities projects. The presentation is structured by a conceptual research process that is introduced in Chapter 1. The process distinguishes a set of five research activities: research question generation, corpus acquisition, research question modeling, corpus annotation, and result dissemination. Each of these research activities elicits different information retrieval tasks with special challenges, for which algorithmic approaches are presented after an introduction of the core information retrieval concepts in Chapter 2. A vital concept in many of the presented approaches is the keyquery paradigm introduced in Chapter 3, which represents an operation that returns relevant search queries in response to a given set of input documents. Keyqueries are proposed in Chapter 4 for the recommendation of related work, and in Chapter 5 for improving access to aspects hidden in the long tail of search result lists. With pseudo-descriptions, a document expansion approach is presented in Chapter 6. The approach improves the retrieval performance for corpora where only bibliographic meta-data is originally available. In Chapter 7, the keyquery paradigm is employed to generate dynamic taxonomies for corpora in an unsupervised fashion. Chapter 8 turns to the exploration of annotated corpora, and presents scoped facets as a conceptual extension to faceted search systems, which is particularly useful in exploratory search settings. For the purpose of highlighting the major topical differences in a sequence of sub-corpora, an algorithm called topical sequence profiling is presented in Chapter 9. The thesis concludes with two pilot studies regarding the visualization of (re)search results for the means of successful result dissemination: a metaphoric interpretation of the information nutrition label, as well as the philosophical bodies, which are 3D-printed search results.},
  subject      = {Information Retrieval},
  language  = {en}
}