@article{LangnerSieberRietigetal.2023, author = {Langner, Thomas and Sieber, Tim and Rietig, Anja and Acker, J{\"o}rg}, title = {A phenomenological and quantitative view on the degradation of positive electrodes from spent lithium-ion batteries in humid atmosphere}, doi = {10.1038/s41598-023-32688-0}, year = {2023}, abstract = {The present study deals with the phenomenological observation of the corrosion of the positive electrode foil of lithium-ion batteries containing LiNi0.6Co0.2Mn0.2O2 (NMC) as cathode material. Due to the presence of moisture, localized water accumulation is formed on the NMC surface. The water absorbed by the electrolyte reacts with the NMC under Li+/H+ exchange and the resulting pH increase leads to dissolution of the carrier foil and characteristic salt-like blooms on the NMC surface. With the increase in the relative area occupied by the holes in the aluminum foil per time, a sufficiently suitable parameter was found with which to quantitatively determine the extent of corrosion. The degree of degradation depends on time and ambient humidity. It was shown that functional recycling with the water jet method is no longer applicable for degraded foils, since the mechanical stability of the foils decreases as corrosion progresses. Lithium, aluminum, sulfur and oxygen were detected in the blooms using SEM-EDX and Laser-Induced-Breakdown-Spectroscopy (LIBS). The underlying NMC layer was found to contain mainly aluminum and significantly lower lithium content than the non-degraded material. SEM and Raman microscopy analyses also showed that the active material is also locally degraded and therefore no longer suitable for functional recycling.}, subject = {Analytical chemistry Surface chemistry; Inorganic chemistry; Materials chemistry; Process chemistry; Materials science; Analytische Chemie; Anorganische Chemie; Werkstoffchemie; Werkstoffkunde; Chemische Technik; Analytische Chemie; Lithiumbatterie; Elektrodenfolie; Korrosion; Recycling}, language = {en} } @phdthesis{Enow2023, author = {Enow, Ernest Ako}, title = {Possible synergy between FLEGT-VPA \& REDD+ towards improving forest governance framework in Cameroon}, doi = {10.26127/BTUOpen-6536}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:co1-opus4-65364}, school = {BTU Cottbus - Senftenberg}, year = {2023}, abstract = {Illegal logging is seen as a serious impediment to achieving sustainable management of forests in the tropics. In addition, deforestation contributes in increasing carbon dioxide emissions in the atmosphere, resulting to biodiversity loss and climate change. Illegal logging and deforestation have affected Cameroon's forest ecosystem negatively since the mid-1980s as a result of the economic crises, which intensified the exploitation of forest resources for multiple purposes. In response, some policy initiatives came up such as FLEGT-VPA and REDD+ to fight against the threats. It is due to the above background that this study was designed to examine the possible synergy between FLEGT-VPA and REDD+ towards improving the forest governance framework in Cameroon. The first part of the study assesses FLEGT-VPA in Cameroon with the application of interviews of key informants who were involved in the negotiation process of the EU-Cameroon Voluntary Partnership Agreement. The second part of the study assesses the management of Bimbia Bonadikombo Community Forest (BBCF), as one of the REDD+ pilot project sites around Mount Cameroon in the South West Region of Cameroon. The use of surveys, content analysis, and observations seeks to assess these two initiatives in their role in improving forest governance in Cameroon. The first part of the research reveals that since Cameroon ratified the FLEGT-VPA in 2011, there has been progressed concerning stakeholder participation in forest-related issues. Again, the study also reveals challenges faced with the setting up of a system to verify timber from legal origin as recommended by the European Union. The research further reveals a lack of commitment by the government in revising the current forest policies and re-organizing the domestic market for timber trade as part of the commitment made by the government during the ratification of the FLEGT-VPA. The second part of the study finds that the management of BBCF is not governed by the provision of the Cameroon community forestry manual or by its bylaws posing doubts if community forestry can halt emissions of greenhouse gases caused by deforestation, thus helping REDD+ achieve its objectives. The study recommends the need for rapid policy reform and a cross-sectoral transformation to enable FLEGT-VPA and REDD+ to synergize for a better policy outcome on issues concerning forestry and climate change.}, subject = {Cameroon; FLEGT-VPA; REDD+; Illegal logging; Policy; Kamerun; Illegale Abholzung; Entwaldung; Politik; Kamerun; Umweltpolitik; Forstverwaltung; Rodung; Kohlendioxidemission; Klima{\"a}nderung; REDD; Forstrecht}, language = {en} } @phdthesis{Sain2022, author = {Sain, Chetan Kumar}, title = {Concepts development of variable fan nozzle for future generation of aeroengines}, doi = {10.26127/BTUOpen-6515}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:co1-opus4-65158}, school = {BTU Cottbus - Senftenberg}, year = {2022}, abstract = {The next generation of civil turbofan engines targets the by-pass ratios of up to 20:1, requiring an innovative fan design with a low fan pressure ratio, low specific thrust and a radically increased fan diameter. The aerodynamic stability of such a large slow rotating fan is very sensitive against the back-pressure variations in the by-pass duct, especially during the take-off operations. The back-pressure regulation can be achieved significantly through a Variable Area Fan Nozzle (VAFN). This work deals with the design development of VAFN concepts for ultra-high by-pass ratio engines which was researched in EU funded program ENOVAL and received funding under grant agreement number 604999. A system engineering approach was implemented for the VAFN development by following the requirements in conceptual, preliminary and detailed design phases. The design domains in the rear nacelle and under the core fairing were selected for the concept generation. Several qualitative and quantitative trade studies were conducted to down-select the best-fit solution during each design phase. These included the kinematic simulations of various types of VAFN modulations; analytical calculations to understand the thermodynamics of the selected VAFN kinematics; aerodynamic performance predictions using CFD simulations on a large number of preliminary designs; 3D CFD simulations for detailed performance assessments including the design optimization of individual features and distortions due to failed modulations; and FEM calculations for the topology generation and optimization of structural components. The overall weighted effect was determined for each output parameter and the results were presented in percentile changes relative to that with a fixed nozzle reference geometry. Two VAFN concepts were selected for the final detailed design phase, Flaps in rear nacelle domain and Variable Inner Fairing Structure (VIFS). Both concepts showed better outputs in terms of specific fuel consumption, noise emission and fan's safety margin during the take-off, with an over-area exhaust position than those with a fixed nozzle operation. During the climb phase, with an under-area VAFN position, both concepts resulted in drawbacks due to higher aerodynamic losses relative to the fixed nozzle. During MCR, both the VAFN concepts with stowed positions caused losses mainly due to leakages and higher structural weights relative to the fixed nozzle configuration. For each VAFN concept, a detailed system definition was developed and the function trees for each operation were explained. A discrete modulation type with two positions was described and recommended for both concepts. This included an over-area deployed position for the take-off phase and a stowed position for the rest of the flight, based on the beneficial performance of the VAFN concepts over the fixed clean nozzle configuration.}, subject = {Variable area fan nozzle; Ultra high bypass ratio turbofan engine; Performance analysis; Bypass duct; Fan nozzle structural analysis; Turbofan-Triebwerk; Variable Fan-D{\"u}se; Leistungsanalyse der D{\"u}se; D{\"u}senkonzept; Designentwicklung; Mantelstromtriebwerk; D{\"u}se; Thermodynamik; Design}, language = {en} } @phdthesis{Spiess2023, author = {Spieß, Benjamin}, title = {The artificial engineer : a smart holistic framework for the automated transfer of geometry to analysis models}, doi = {10.26127/BTUOpen-6530}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:co1-opus4-65308}, school = {BTU Cottbus - Senftenberg}, year = {2023}, abstract = {The creation of adequate simulation models for complex assemblies is an extensive process that requires a lot of experience, and on the other hand involves a multitude of manual, tedious tasks. These are significant obstacles for improving the process performance and capabilities. The objective of this research is to develop methods which digitally imitate the way of thoughts of the engineer in the design process towards a digital system understanding and which support the automation of the involved manual workflow. This thesis presents a strategy to translate engineering reasoning and actions to an equivalent in the computer domain. A cardinal step is to gain understanding of system arrangements, boundary conditions and its components. Based on this evaluation, the identification of assembly parts is forming the foundation for optimized process chains for the transfer to the analysis environment. Model complexity relates to computational effort, which in turn affects model capabilities and manageability. To achieve a satisfactory compromise of model quality and complexity, this transfer process is strongly dependent on the visual analysis, reasoning and manual implementation of skilled engineers. The principle of translating engineering logics is pursued from the assembly system to its smallest parts. Component segmentation methods allow subdividing regions of interest into substructures which are assigned with a feature vector. This vector comprises metrics describing the substructures with regard to specific aspects and is the key decision point for subsequent steps as idealization, suitable Finite-Element modeling and ultimately building an analysis model. The created system database is continuously maintained and supports these process chains as well as the final setup of the assembly simulation model. An automated workflow like this implies advantages for efficiency, but also creates opportunities for further use cases. This workflow has been exploited for generating a training data set from the different simulation variants as a basis to a knowledge representation imitating engineering experience. An algorithm from the graph neural network field is applied to this data set as a conceptual approach. The intention pursued in this concept is to model the learning progress about estimating the influence of modelling decisions on simulation results and quality. This research proposes a holistic strategy and describes methods to achieve the objectives of decreasing manual effort, introducing an automated and geometry-based process and digitally replicating engineering experience by introducing a knowledge database.}, subject = {Engineering; Automation; Artificial intelligence; Design; Machine learning; Automatisierung; Simulation; K{\"u}nstliche Intelligenz; CAD; FEM; Automatisierung; CAD; Finite-Elemente-Methode; K{\"u}nstliche Intelligenz; Simulation}, language = {en} } @phdthesis{BattisSchinker2023, author = {Battis-Schinker, Eva}, title = {Assessing authenticity in heritage conservation : case study : architectural conservation in Bahrain}, doi = {10.26127/BTUOpen-6511}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:co1-opus4-65118}, school = {BTU Cottbus - Senftenberg}, year = {2023}, abstract = {The thesis complements the authenticity discourse in heritage conservation with the perspective of laypeople and evaluates the pertinent methodology for the application of the normative concept in architectural heritage conservation. Based on the Nara Document on Authenticity, the Operational Guidelines for the Implementation of the World Heritage Convention anchor the concept in the credibility and truthfulness of internal and external factors - referred to as information sources - that communicate a heritage site's cultural values. Conversely, the author explored the truthfulness of messages conveyed to site users in a qualitative research based on interviews focused on two urban reference sites in Bahrain. These stand for different eras and conservation approaches: the ensemble of colonial-style governmental buildings at Bab al-Bahrain in Manama and the vernacular Siyadi Shops in the market area Suq al-Qaisariya in Muharraq, which were restored in the course of a World Heritage nomination. The interpretive content analysis compares how architects and non-architects, who represent laypeople in architectural conservation, perceived their authenticity and also traces cultural contingencies. The empirical data confirms pronounced differences in the way architects and non-architects perceive authenticity but only a few between representatives of so-called Western and Eastern cultures. Assessed against international heritage conservation standards, the site in Muharraq proved more authentic than the one in Manama. However, the meanings produced in the interaction between the sites and the interviewees proved be of limited truthfulness in both cases. A key finding is hence that a constructivist authenticity concept can serve no normative function when heritage conservation is considered a discipline at the service of historiography. While all potential factors of authenticity as per the Nara Document proved to be relevant, perceived material authenticity was found to be an outstanding reason why the site in Muharraq was appreciated more. Its rehabilitation was found to successfully reconcile essentialist and constructivist authenticity understandings by paying tribute both to the documentary value of the historic site and to the experiential needs of its users. The findings support the ICOMOS Venice Charter's material-focused approach while confirming the relevance of a broadened authenticity understanding and highlighting the importance of integrated, participatory approaches to heritage conservation. By illustrating the importance of expertise when assessing the authenticity of architectural heritage, the findings at the same time flag limits to democratizing architectural conservation practice. The author recommends developing practice-oriented guidance for the assessment of authenticity of heritage sites based on further research and to add interpretation facilities to the list of factors of authenticity.}, subject = {Authentizit{\"a}t; Baudenkmalpflege; UNESCO Welterbe; ICOMOS Charta von Venedig; Bahrain; Authenticity; Architectural conservation; UNESCO World Heritage; ICOMOS Venice Charter; Bahrain; Bahrain; Baudenkmal; Denkmalpflege; Authentizit{\"a}t; Internationale Charta {\"u}ber die Erhaltung und Wiederherstellung von Denkmalen}, language = {en} } @misc{OPUS4-6510, title = {Culture, capital, urban transformation : insights into urban development in Timisoara, Novi Sad and Belgrade}, editor = {Weidner, Silke and Viderman, Tihomir}, issn = {2702-6892}, doi = {10.26127/BTUOpen-6510}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:co1-opus4-65102}, year = {2022}, abstract = {In the summer term 2020 the Chair of Urban Management, BTU Cottbus-Senftenberg, conducted an excursion for Master students of planning and architecture to the region on both sides of the border between Romania and Serbia in a format of distance learning. Over three days the students and local experts of various professional backgrounds engaged online in discussion on urban development in Timișoara, Novi Sad and Belgrade. We explored how the dynamics of changing physical and social boundaries shape urban territories in a tension between centrality and periphery, while also engaging with the paradigm shift in planning centred on culture and people's participation, as well as anticipations from flagship culture schemes to trigger positive urban changes. This publication provides summaries of some of the contributions, illuminating urban development as a complex process which involves a plurality of geopolitical shifts, engaged actors, interests, perspectives, hope-filled approaches and instruments.}, subject = {Transition; Urban development; Social space; Participation; European Capital of Culture; {\"U}bergang; Stadtentwicklung; Sozialer Raum; Beteiligung; Kulturhauptstadt Europas; Rum{\"a}nien; Serbien; Grenzgebiet; Kulturhauptstadt; Stadtentwicklung; B{\"u}rgerbeteiligung}, language = {mul} } @phdthesis{Ilić2023, author = {Ilić, Aleksandar}, title = {Strategies for increasing maximum throughput and reducing latency in tree-based WSNs}, doi = {10.26127/BTUOpen-6498}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:co1-opus4-64986}, school = {BTU Cottbus - Senftenberg}, year = {2023}, abstract = {This thesis deals with strategies for achieving high data throughput in wireless sensor networks that use a time division multiple access (TDMA) scheme to resolve medium access. The thesis uses a multi-sided approach that deals not only with the scheduling algorithm but also with the network layer and the interference model. The thesis proposes four solutions that significantly improve data throughput, fairness, and latency in the considered scenario. The thesis starts with an overview of state-of-the-art medium access control (MAC) protocols, emphasizing TDMA. Based on this overview, it is concluded that not much space for improvement is left in the field of schedule calculation algorithms; many such algorithms are proposed up to date, and they can achieve schedule lengths close to the theoretical minimum. However, the research also reveals a lack of in-detail evaluation and comparison of these algorithms; this makes choosing the most suitable algorithm for a particular application hard and performance estimation inaccurate. Therefore, an extensive evaluation of state-of-the-art TDMA protocols using simulations and over 200 randomly generated networks was performed to tackle this issue. The results allow choosing an appropriate algorithm and estimating performance for each specific application. Next, the problem of multiple packet transmissions during a single time slot is analyzed. State-of-the-art TDMA protocols assume that one packet can be transmitted in each slot and optimize the number of slots each node gets under this assumption. However, when nodes can transmit more than one packet, the performance of such a schedule is impaired. To solve this, the M-TreeMAC protocol is proposed; this protocol considers the actual number of packets transmitted in a time slot and optimizes the schedule accordingly. Furthermore, it is observed that the routing topology heavily impacts the schedule length created using this algorithm; an algorithm that optimizes the topology to result in the shortest schedule when M-TreeMAC is used is proposed, increasing benefits even further. Finally, the accuracy of the 2-hop interference model, commonly used by state-of-the-art TDMA scheduling algorithms, is studied and simulated using a realistic radio model based on measurement results. The results show high packet loss ratios for packets traveling a large number of hops to reach the sink. The adaptive interference model is proposed to improve the 2-hop interference model. The proposed model can increase throughput significantly in networks with a height of ten or more hops.}, subject = {WSN; TDMA; Interference; Throughput optimization; Drahtlose Sensornetzwerke; Interferenz; Maximierung des Datendurchsatzes; Zeitmultiplexverfahren; Drahtloses Sensorsystem; Funk{\"u}bertragung; TDMA; Energieeffizienz}, language = {en} } @phdthesis{Stolz2023, author = {Stolz, Michael}, title = {Ermittlung und Beurteilung der Zuverl{\"a}ssigkeit von lateralen elektrostatischen Nanoaktoren und ihr Einfluss auf zuk{\"u}nftige Anwendungen}, doi = {10.26127/BTUOpen-6533}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:co1-opus4-65332}, school = {BTU Cottbus - Senftenberg}, year = {2023}, abstract = {In dieser Dissertation wurden Zuverl{\"a}ssigkeitsaspekte der NED-Aktoren betrachtet und ihre Langzeitstabilit{\"a}t untersucht. Die Langzeituntersuchungen an einzelnen NED-Aktoren haben gezeigt, dass insbesondere große elektrische Felder zur Verk{\"u}rzung der Lebensdauer der Aktorik f{\"u}hren k{\"o}nnen. Elektrische Felder beschleunigen Oxidation der NED-Siliziumelektroden. Dabei wurden zwei unterschiedliche Oxidationsmechanismen beobachtet: die anodische Oxidation von Siliziumelektroden im Isolatorbereich und die feldemissionsunterst{\"u}tzte Oxidation. Die beiden Degradationsmechanismen beg{\"u}nstigen das Wachstum des Siliziumoxides an Siliziumelektroden und resultieren in der Ver{\"a}nderung der Oszillationseigenschaften der NED-Aktoren mit der Zeit. Weitere Untersuchungen an den NED-basierten Anwendungen - Mikrolautsprecher haben verdeutlicht, dass solche Faktoren wie Feuchtigkeit die Degradation am meisten forcieren. Durch Passivierung der Aktoren, wobei sie z. B. mit Aluminiumoxid im ALD-Verfahren verkapselt werden, k{\"o}nnen unerw{\"u}nschte Degradationsmechanismen deutlich verlangsamt werden. Durch eine geeignete Materialwahl bei der Verkapselung kann sogar gleichzeitig die Effizienz der Aktoren verbessert werden.}, subject = {Nanoaktor; NED; Zuverl{\"a}ssigkeit; MEMS; Nanoscopic electrostatic drive; Nano actuators; Reliability; Mikroaktor; MEMS; Zuverl{\"a}ssigkeit}, language = {de} } @misc{SeemannHerz2023, type = {Master Thesis}, author = {Seemann-Herz, Lisanne}, title = {Schulbezogene Anti-Hatespeech-Programme : eine kriteriengeleitete Bestandsaufnahme}, isbn = {978-3-940471-76-5}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:co1-opus4-65257}, school = {BTU Cottbus - Senftenberg}, year = {2023}, abstract = {Das Ph{\"a}nomen Hatespeech gewinnt zunehmend Aufmerksamkeit in der {\"O}ffentlichkeit und in der Forschung. Das ist insofern wichtig, weil Hass, Hetze und Diskriminierung gegen{\"u}ber Menschen, die einer bestimmten Gruppe zugeordnet werden, vor allem {\"u}ber Informations- und Kommunikationstechnologien eine gesamtgesellschaftliche Verrohung zur Folge hat. Hatespeech schr{\"a}nkt die Meinungsvielfalt ein und bedeutet eine Bedrohung f{\"u}r die Demokratie. Sie stellt jedoch kein reines Netzph{\"a}nomen dar, sondern basiert auf real existierende Macht- und Diskriminierungsstrukturen. Das Ph{\"a}nomen einzud{\"a}mmen, ist die Intention verschiedener Stiftungen und Initiativen. Hatespeech ist jedoch allgegenw{\"a}rtig und selbst in der Schule verbreitet. Sie stellt damit eine Gefahr insbesondere f{\"u}r junge Heranwachsende und weiterf{\"u}hrend f{\"u}r das allt{\"a}gliche Schulleben dar. Somit stellt sich die Frage, welche Mittel der Institution Schule zu Verf{\"u}gung stehen, um dem Ph{\"a}nomen wirksam entgegenzutreten. Im Zuge von pr{\"a}ventiven und interventiven Maßnahmen stehen schulbezogene Programme im Vordergrund. Die vorliegende Masterthesis befasst sich daher mit einer ersten Bestandsaufnahme von deutschsprachigen, schulbezogenen Programmen zur Pr{\"a}vention und Intervention bei Hatespeech unter Kindern und Jugendlichen (Jahrgangsstufen 5 bis 12). Insgesamt konnten 14 entsprechende Programme im Rahmen der Recherchearbeit identifiziert werden. Diese wurden auf ihre Inhalte und Durchf{\"u}hrungsmodalit{\"a}ten sowie anhand von f{\"u}nf ausgew{\"a}hlten Qualit{\"a}tskriterien analysiert und hinsichtlich ihrer Anwendung in der schulischen Praxis beschrieben und er{\"o}rtert. Die {\"U}bersicht {\"u}ber Schwerpunkte, St{\"a}rken sowie Entwicklungspotentiale schulbezogener Hatespeech-Programme soll eine informierte Entscheidung {\"u}ber den Einsatz der Programme in der Schule und dar{\"u}ber hinaus in der offenen Kinder- und Jugendarbeit erm{\"o}glichen.}, subject = {Schule; Pr{\"a}vention; Intervention; Kindes- und Jugendalter; Hate speech; School; Prevention; Intervention; Childhood and adolescence; Diskriminierung; Hassrede; Intervention; Kind; Jugend; Pr{\"a}vention; Schule; Hatespeech}, language = {de} } @techreport{ObermuellerRadvanSchiffner2023, type = {Working Paper}, author = {Oberm{\"u}ller, Christian and Radvan, Heike and Schiffner, Johanna}, title = {„Es w{\"a}re gut, wenn Putin hier mal auskehren k{\"o}nnte" : Analysen zu Mobilisierungen (extrem) rechter Akteure in Cottbus in Reaktion auf den russischen Angriffskrieg gegen die Ukraine 2022}, doi = {10.26127/BTUOpen-6504}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:co1-opus4-65043}, year = {2023}, abstract = {Die Stadt Cottbus ist seit mehreren Jahren durch extrem rechte und verschw{\"o}rungsideologische Mobilisierung herausgefordert. Auch in der Covid-19-Pandemie ist Cottbus Schauplatz regelm{\"a}ßiger Demonstrationen. Mit Beginn des russischen Angriffskriegs auf die Ukraine verschiebt sich der inhaltliche Fokus der sogenannten Montagsspazierg{\"a}nger sukzessive weg von der Pandemie und hin zum Krieg. Die hier vorliegende Forschung wendet sich den Protestveranstaltungen zu, die im Zeitraum vom 28. Februar bis 24. Oktober 2022 in Cottbus in Reaktion auf den russischen Angriffskrieg organisiert werden und untersucht unter Anwendung der Grounded Theory ausgew{\"a}hlte Redebeitr{\"a}ge. Sie zielt darauf ab, die Inhalte und Darstellungsweisen der RednerInnen hinsichtlich der Gefahrenpotentiale einzuordnen und im Sinne anwendungsbezogener Forschung in Richtung Pr{\"a}vention und zivilgesellschaftlicher Gegenwehr weiterzudenken. Die Forschung zeigt: {\"A}hnlich wie in anderen ostdeutschen St{\"a}dten sind auch in Cottbus die Veranstaltungen von extrem rechten Akteuren und Gruppen dominiert; sie werden unterst{\"u}tzt von Teilen eines b{\"u}rgerlichen Milieus der sogenannten gesellschaftlichen Mitte. Sichtbar wird außerdem: Akteure aus dem Coronaprotestmilieu haben sich weiter radikalisiert; verschw{\"o}rungs- und insbesondere reichsb{\"u}rgerideologische Inhalte dominieren die untersuchten Veranstaltungen und mischen sich mit prorussischen Positionen und dem Ideologem einer „eurasischen" Neuordnung des europ{\"a}isch-asiatischen Raums. Die Ablehnung „des Westens" bildet ein wiederkehrendes Metanarrativ.}, subject = {Rechtsextremismus; Verschw{\"o}rungsideologie; Reichsb{\"u}rger; Ostdeutschland; Rekonstruktive Forschung; Souver{\"a}nismus; Right-wing extremism; Conspiracy ideology; East Germany; Reconstructive research; Sovereignism; Cottbus; Demonstration; Grounded theory; Protestbewegung; Rechtsradikalismus; Verschw{\"o}rungstheorie}, language = {de} }