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Institute
- IKMZ (2367)
- Präsident*in (582)
- Präsident HL (263)
- FG Energieverteilung und Hochspannungstechnik (51)
- FG Systeme (41)
- FG Angewandte Physik und Halbleiterspektroskopie (36)
- FG Gewässerökologie (31)
- FG Ingenieurmathematik und Numerik der Optimierung (29)
- FG Stadtmanagement (29)
- FG Ökologie (28)
Hybrid simulation of biological processes becomes widely used to overcome the limitations of the pure stochastic or the complete deterministic simulation. In this manual, we present easy-to-follow steps for constructing and executing hybrid models via Snoopy [HHL+12]. Snoopy is a tool to design and animate or simulate hierarchical graphs, i.e., qualitative, stochastic, continuous, and hybrid Petri nets. This manual is concerned with hybrid Petri nets (HPN) [HH12] as well as their coloured counterpart (HPNC) [HLR14]. HPN combine the merits of stochastic and continuous Petri nets into one single class. Moreover, HPN in Snoopy supports state of the art hybrid simulation algorithms (e.g., [HH16]) to execute the constructed HPN models. Simulating a model using Snoopy's hybrid simulation involves first constructing the reaction network via HPN notations and afterwards executing such model.
1. Memristor-Symposium 2023
(2023)
The 1.Memristor-Symposium was held from 27-28.02.2023 in Bamberg. Young scientists and PhD students presented their research and covered several topics regarding ongoing memristive research in Germany. Several talks on the topic of memristive devices, their testing, modeling and usage were presented and discussed, covering the whole vertical integration from material and divice up to application level.
In the time of increased awareness about the environment problems by the public opinion and also intensive international efforts to reduce emissions of greenhouse gases, as well increase of the generation of electrical energy to facilitate industrial growth, the conference offers broad contribution towards achieving the goals of diversification and sustainable development.
Focus of the student conference is to promote the discussion of views from scientists and students from Wroclaw University of Technology, Technical University of Ostrava and Brandenburg Technical University of Cottbus.
The conference offers prominent academics and industrial practitioners from all over the world the forum for discussion about the future of electrical energy and environmental issues and presents a base for identifying directions for continuation of research.
In the time of increased awareness about the environment problems by the public opinion and also intensive international efforts to reduce emissions of greenhouse gases, as well increase of the generation of electrical energy to facilitate industrial growth, the conference offers broad contribution towards achieving the goals of diversification and sustainable development.
Focus of the student conference is to promote the discussion of views from scientists and students from Wroclaw University of Technology, Technical University of Ostrava and Brandenburg Technical University of Cottbus.
The conference offers prominent academics and industrial practitioners from all over the world the forum for discussion about the future of electrical energy and environmental issues and presents a base for identifying directions for continuation of research.
In the time of increased awareness about the environment problems by the public opinion and also intensive international efforts to reduce emissions of greenhouse gases, as well increase of the generation of electrical energy to facilitate industrial growth, the conference offers broad contribution towards achieving the goals of diversification and sustainable development.
Focus of the student conference is to promote the discussion of views from scientists and students from Wroclaw University of Technology, Technical University of Ostrava and Brandenburg Technical University of Cottbus.
The conference offers prominent academics and industrial practitioners from all over the world the forum for discussion about the future of electrical energy and environmental issues and presents a base for identifying directions for continuation of research.
In the time of increased awareness about the environment problems by the public opinion and also intensive international efforts to reduce emissions of greenhouse gases, as well increase of the generation of electrical energy to facilitate industrial growth, the conference offers broad contribution towards achieving the goals of diversification and sustainable development.
Focus of the student conference is to promote the discussion of views from scientists and students from Wroclaw University of Technology, Technical University of Ostrava and Brandenburg Technical University of Cottbus.
The conference offers prominent academics and industrial practitioners from all over the world the forum for discussion about the future of electrical energy and environmental issues and presents a base for identifying directions for continuation of research.
Drahtlose Sensornetze stellen eine vielversprechende Technologie zur Beobachtung und Beeinflussung von Vorgängen in der realen Welt dar. Autonome Sensorknoten nehmen dabei Parameter der Umwelt durch Sensoren wahr und können diese durch Aktoren beeinflussen. Viele solcher autonomen und ressourcenbeschränkten Knoten kooperieren dabei mittels drahtloser Kommunikation. Die Eigenschaften dieser Knoten und Netze implizieren eine Vielzahl von neuartigen Herausforderungen, die sich in einer regen Forschungsaktivität widerspiegeln. Ziel dieser Reihe von Fachgesprächen ist es, Wissenschaftlerinnen und Wissenschaftlern aus Hochschule und Industrie die Möglichkeit zu einem informellen Gedankenaustausch zu geben und die Kooperation in diesem multidisziplinären Forschungsbereich zu verstärken.
In the time of increased awareness about the environment problems by the public opinion and also intensive international efforts to reduce emissions of greenhouse gases, as well increase of the generation of electrical energy to facilitate industrial growth, the conference offers broad contribution towards achieving the goals of diversification and sustainable development.
Focus of the student conference is to promote the discussion of views from scientists and students from Wroclaw University of Technology, Technical University of Ostrava and Brandenburg Technical University of Cottbus.
The conference offers prominent academics and industrial practitioners from all over the world the forum for discussion about the future of electrical energy and environmental issues and presents a base for identifying directions for continuation of research.
In the time of increased awareness about the environment problems by the public opinion and also intensive international efforts to reduce emissions of greenhouse gases, as well increase of the generation of electrical energy to facilitate industrial growth, the conference offers broad contribution towards achieving the goals of diversification and sustainable development.
Focus of the student conference is to promote the discussion of views from scientists and students from Wroclaw University of Technology, Technical University of Ostrava and Brandenburg Technical University of Cottbus.
The conference offers prominent academics and industrial practitioners from all over the world the forum for discussion about the future of electrical energy and environmental issues and presents a base for identifying directions for continuation of research.
In the time of increased awareness about the environment problems by the public opinion and also intensive international efforts to reduce emissions of greenhouse gases, as well increase of the generation of electrical energy to facilitate industrial growth, the conference offers broad contribution towards achieving the goals of diversification and sustainable development.
Focus of the student conference is to promote the discussion of views from scientists and students from Wroclaw University of Technology, Technical University of Ostrava and Brandenburg Technical University of Cottbus.
The conference offers prominent academics and industrial practitioners from all over the world the forum for discussion about the future of electrical energy and environmental issues and presents a base for identifying directions for continuation of research.
In the time of increased awareness about the environment problems by the public opinion and also intensive international efforts to reduce emissions of greenhouse gases, as well increase of the generation of electrical energy to facilitate industrial growth, the conference offers broad contribution towards achieving the goals of diversification and sustainable development.
Focus of the student conference is to promote the discussion of views from scientists and students from Wroclaw University of Technology, Technical University of Ostrava and Brandenburg Technical University of Cottbus.
The conference offers prominent academics and industrial practitioners from all over the world the forum for discussion about the future of electrical energy and environmental issues and presents a base for identifying directions for continuation of research.
In the time of increased awareness about the environment problems by the public opinion and also intensive international efforts to reduce emissions of greenhouse gases, as well increase of the generation of electrical energy to facilitate industrial growth, the conference offers broad contribution towards achieving the goals of diversification and sustainable development.
Focus of the student conference is to promote the discussion of views from scientists and students from Wroclaw University of Technology, Technical University of Ostrava and Brandenburg Technical University of Cottbus.
The conference offers prominent academics and industrial practitioners from all over the world the forum for discussion about the future of electrical energy and environmental issues and presents a base for identifying directions for continuation of research.
In the time of increased awareness about the environment problems by the public opinion and also intensive international efforts to reduce emissions of greenhouse gases, as well increase of the generation of electrical energy to facilitate industrial growth, the conference offers broad contribution towards achieving the goals of diversification and sustainable development.
Focus of the student conference is to promote the discussion of views from scientists and students from Wroclaw University of Technology, Technical University of Ostrava and Brandenburg Technical University of Cottbus.
The conference offers prominent academics and industrial practitioners from all over the world the forum for discussion about the future of electrical energy and environmental issues and presents a base for identifying directions for continuation of research.
In the time of increased awareness about the environment problems by the public opinion and also intensive international efforts to reduce emissions of greenhouse gases, as well increase of the generation of electrical energy to facilitate industrial growth, the conference offers broad contribution towards achieving the goals of diversification and sustainable development.
Focus of the student conference is to promote the discussion of views from scientists and students from Wroclaw University of Technology, Technical University of Ostrava and Brandenburg Technical University of Cottbus.
The conference offers prominent academics and industrial practitioners from all over the world the forum for discussion about the future of electrical energy and environmental issues and presents a base for identifying directions for continuation of research.
In the time of increased awareness about the environment problems by the public opinion and also intensive international efforts to reduce emissions of greenhouse gases, as well increase of the generation of electrical energy to facilitate industrial growth, the conference offers broad contribution towards achieving the goals of diversification and sustainable development.
Focus of the student conference is to promote the discussion of views from scientists and students from Wroclaw University of Technology, Technical University of Ostrava and Brandenburg Technical University of Cottbus.
The conference offers prominent academics and industrial practitioners from all over the world the forum for discussion about the future of electrical energy and environmental issues and presents a base for identifying directions for continuation of research.
In the time of increased awareness about the environment problems by the public opinion and also intensive international efforts to reduce emissions of greenhouse gases, as well increase of the generation of electrical energy to facilitate industrial growth, the conference offers broad contribution towards achieving the goals of diversification and sustainable development.
Focus of the student conference is to promote the discussion of views from scientists and students from Wroclaw University of Technology, Technical University of Ostrava and Brandenburg University of Technology Cottbus-Senftenberg.
The conference offers prominent academics and industrial practitioners from all over the world the forum for discussion about the future of electrical energy and environmental issues and presents a base for identifying directions for continuation of research.
In the time of increased awareness about the environment problems by the public opinion and also intensive international efforts to reduce emissions of greenhouse gases, as well increase of the generation of electrical energy to facilitate industrial growth, the conference offers broad contribution towards achieving the goals of diversification and sustainable development.
Focus of the student conference is to promote the discussion of views from scientists and students from Wroclaw University of Technology, Technical University of Ostrava and Brandenburg University of Technology Cottbus-Senftenberg.
The conference offers prominent academics and industrial practitioners from all over the world the forum for discussion about the future of electrical energy and environmental issues and presents a base for identifying directions for continuation of research.
In the time of increased awareness about the environment problems by the public opinion and also intensive international efforts to reduce emissions of greenhouse gases, as well increase of the generation of electrical energy to facilitate industrial growth, the conference offers broad contribution towards achieving the goals of diversification and sustainable development.
Focus of the student conference is to promote the discussion of views from scientists and students from Wroclaw University of Technology, Technical University of Ostrava and Brandenburg University of Technology Cottbus-Senftenberg.
The conference offers prominent academics and industrial practitioners from all over the world the forum for discussion about the future of electrical energy and environmental issues and presents a base for identifying directions for continuation of research.
In the time of increased awareness about the environment problems by the public opinion and also intensive international efforts to reduce emissions of greenhouse gases, as well increase of the generation of electrical energy to facilitate industrial growth, the conference offers broad contribution towards achieving the goals of diversification and sustainable development.
Focus of the student conference is to promote the discussion of views from scientists and students from Wroclaw University of Technology, Technical University of Ostrava and Brandenburg University of Technology Cottbus-Senftenberg.
The conference offers prominent academics and industrial practitioners from all over the world the forum for discussion about the future of electrical energy and environmental issues and presents a base for identifying directions for continuation of research.
In the time of increased awareness about the environment problems by the public opinion and also intensive international efforts to reduce emissions of greenhouse gases, as well increase of the generation of electrical energy to facilitate industrial growth, the conference offers broad contribution towards achieving the goals of diversification and sustainable development.
Focus of the student conference is to promote the discussion of views from scientists and students from Wroclaw University of Technology, Technical University of Ostrava and Brandenburg University of Technology Cottbus-Senftenberg.
The conference offers prominent academics and industrial practitioners from all over the world the forum for discussion about the future of electrical energy and environmental issues and presents a base for identifying directions for continuation of research.
In the time of increased awareness about the environment problems by the public opinion and also intensive international efforts to reduce emissions of greenhouse gases, as well increase of the generation of electrical energy to facilitate industrial growth, the conference offers broad contribution towards achieving the goals of diversification and sustainable development.
Focus of the student conference is to promote the discussion of views from scientists and students from Wroclaw University of Technology, Technical University of Ostrava and Brandenburg University of Technology Cottbus-Senftenberg.
The conference offers prominent academics and industrial practitioners from all over the world the forum for discussion about the future of electrical energy and environmental issues and presents a base for identifying directions for continuation of research.
In the time of increased awareness about the environment problems by the public opinion and also intensive international efforts to reduce emissions of greenhouse gases, as well increase of the generation of electrical energy to facilitate industrial growth, the conference offers broad contribution towards achieving the goals of diversification and sustainable development.
Focus of the student conference is to promote the discussion of views from scientists and students from Wroclaw University of Technology, Technical University of Ostrava and Brandenburg University of Technology Cottbus-Senftenberg.
The conference offers prominent academics and industrial practitioners from all over the world the forum for discussion about the future of electrical energy and environmental issues and presents a base for identifying directions for continuation of research.
In the time of increased awareness about the environment problems by the public opinion and also intensive international efforts to reduce emissions of greenhouse gases, as well increase of the generation of electrical energy to facilitate industrial growth, the conference offers broad contribution towards achieving the goals of diversification and sustainable development.
Focus of the student conference is to promote the discussion of views from scientists and students from Wroclaw University of Technology, Technical University of Ostrava and Brandenburg University of Technology Cottbus-Senftenberg.
The conference offers prominent academics and industrial practitioners from all over the world the forum for discussion about the future of electrical energy and environmental issues and presents a base for identifying directions for continuation of research.
There are many names we use to call them, like the (original) Wireless Sensor Networks, Wireless Sensor and Actuator Networks, Internet of Things, Cyber-Physical Systems, Cyber-Physical Systems of Systems, and some others. More or less visible, wireless sensor networks are already applied in many aspects of our lives and for different purposes. During the 20 years of Fachgespräch Sensornetze (FGSN) we were able to observe the process of the birth and evolution of wireless sensor networks. What do they look like now, from that time perspective? Is there still room for research andimprovements? Or are they maybe already that mature that everything has already been said? And what do they look like from the industry point of view? What is the future of sensor networks? Where are they heading? These retrospective and perspective views are the central topic of the 20th edition of the Fachgespräch Sensornetze (FGSN 2023) held on the 4th of September 2023 at Hasso-Plattner-Institut as part of the NetSys 2023 conference in Potsdam. We were happy to meet again, to discuss these subjects within the scientific community. The aim of this series of Fachgespräch is to give scientists from academia and industry the opportunity for an informal exchange of ideas and to strengthen cooperation in this multidisciplinary research area.
In the time of increased awareness about the environment problems by the public opinion and also intensive international efforts to reduce emissions of greenhouse gases, as well increase of the generation of electrical energy to facilitate industrial growth, the conference offers broad contribution towards achieving the goals of diversification and sustainable development.
Focus of the student conference is to promote the discussion of views from scientists and students from Wroclaw University of Technology, Technical University of Ostrava and Brandenburg University of Technology Cottbus-Senftenberg.
The conference is a unique teaching session motivating the students to write science related papers, prepare presentations and discus future developments. It is a formal part of the curriculum offered as an elective module. Accompanied by a technical excursion.
In the time of increased awareness about the environment problems by the public opinion and also intensive international efforts to reduce emissions of greenhouse gases, as well increase of the generation of electrical energy to facilitate industrial growth, the conference offers broad contribution towards achieving the goals of diversification and sustainable development.
Focus of the student conference is to promote the discussion of views from scientists and students from Wroclaw University of Technology, Technical University of Ostrava and Brandenburg University of Technology Cottbus-Senftenberg.
The conference is a unique teaching session motivating the students to write science related papers, prepare presentations and discus future developments. It is a formal part of the curriculum offered as an elective module, accompanied by a technical excursion.
In the time of increased awareness about the environment problems by the public opinion and also intensive international efforts to reduce emissions of greenhouse gases, as well increase of the generation of electrical energy to facilitate industrial growth, the conference offers broad contribution towards achieving the goals of diversification and sustainable development.
Focus of the student conference is to promote the discussion of views from scientists and students from Wroclaw University of Technology, Technical University of Ostrava and Brandenburg University of Technology Cottbus-Senftenberg.
The conference is a unique teaching session motivating the students to write science related papers, prepare presentations and discus future developments. It is a formal part of the curriculum offered as an elective module, accompanied by a technical excursion.
Dieser Tagungsband enthält eine Vielzahl von Vorträgen und Veröffentlichungen mit Bezug zu Energieeffizienz.
Reconstruction of the 3D shape information is a fundamental problem in computer vision. Among different shape recovering technologies, photometric stereo is highlighted for its capability to produce high quality 3D reconstruction. This dissertation generalizes photometric stereo in different aspects towards creating a practical 3D reconstruction. The proposed techniques can be considered as a fundamental support to develop future cameras offering 3D shapes for various applications such as movie and video game industry, medical sciences, virtual reality, automotive driving and etc. The first generalization is developed for addressing specularities in 3D reconstructions and also involving the perspective projection. These attempts lead to remove the limitation of working with diffuse materials and confined projected scenes. We will prove the applicability of our approach using complex scenes like endoscopy images. In the second proposed approach, we will offer a real-time 3D reconstruction of micro-details with a more generalized reflectance model. Moreover, a recurrent optimization network will be provided. These innovations lead to presenting the 3D reconstruction of details which are even invisible to human eyes like micro-prints on the banknote. This information recovery can be used in various areas such as detecting security items on financial documents for fraud detection and also the quality control of any industrial productions including delicate details such as printed circuits. In the third proposed model, we develop a PS reconstruction technique using neural networks for the uncalibrated PS where the light direction is not available. Finally, for the first time, benefiting from deep neural networks and meta heuristic algorithms, we will devise an approach which can deliver high qualified 3D shape from the internet and out-door images, without any pre-necessary knowledge.
Die vorliegende Doktorarbeit betrachtet den erosiven Verschleiß von Laval-Düsen für den pneumatischen Stofftransport. Dazu wurden 3D-CFD-Simulationen der Gas-Partikel-Strömung auf Basis des Softwarepaketes OpenFOAM durchgeführt und ein kompressibler 2-Wege-gekoppelter sowie 4-Wege-gekoppelter Strömungslöser entwickelt. Zusätzlich wurden die Partikelmethoden von OpenFOAM erheblich erweitert. So sind z.B. zusätzliche stochastische Methoden für die Partikel-Partikel und Partikel-Wand-Kollisionen (Sommerfeld & Huber, 1999) mit einer erweiterten translatorischen und rotatorischen Impulserhaltung implementiert worden. Die auf die disperse Phase wirkenden fluidmechanischen Kräfte sind die Widerstandskraft nach Henderson (1976), die Kraft durch Druck- und Spannungstensor sowie die Auftriebskraft. Der erosive Verschleiß wird wahlweise mit dem Tabakoff-Modell (Grant & Tabakoff, 1973) und dem Oka-Modell (Oka et al., 2005; Oka & Yoshida, 2005) berechnet.
Diese Arbeit entstand in Zusammenarbeit mit dem HKW Cottbus, welches im Rauchgasreinigungssystem Laval-Düsen für den pneumatischen Abtransport von Asche verwendet. Aufgrund der hohen Gas- und Partikel-Geschwindigkeiten und der Kontur der Düsen sind diese massiv durch Erosion geschädigt worden. Dadurch haben diese ihre Funktion als Blende verloren, was eine Schädigung weiterer Komponenten des Rauchgasreinigungssystems zur Folge hatte.
Zur Validierung des numerischen Strömungslösers wurde das Experiment von Kumar et al. (1983) ausgewählt und ein qualitativ vergleichbares Ergebnis generiert (60% des experimentellen Werts). Das charakteristische Verschleißbild des Experiments stellt sich nur unter Verwendung eines stochastischen Partikel-Wand-Kollisionsmodells mit hoher Wandrauigkeit ein. Im Fall glatter Wände ist der erosive Verschleiß insgesamt geringer und es verschiebt sich das Maximum der lokalen Erosionsrate.
Aufbauend auf diesen Erkenntnissen ist sowohl die Kontur der Laval-Düse des HKW Cottbus modifiziert worden als auch das Material der Düsenwandung von 13CrMo44-Stahl zu Siliziumcarbid-Keramik geändert worden. Die numerischen Simulationen des 4-Wege-gekoppelten Strömungslösers zeigen, dass sich das lokale Maximum der Verschleißrate im kritischen Bereich der Düsenkehle auf 1.5 % des Ausgangswerts reduziert und zugleich von der Düsenkehle weg verschiebt.
In dieser Doktorarbeit ist im Gegensatz zu vergleichbaren numerischen Studien eine Validierung des Strömungslösers an experimentellen Daten durchgeführt worden. Zudem ist die Bedeutung der Partikel-Partikel-Kollisionen und der Wandrauigkeiten für die Berechnung des erosiven Verschleißes bei Laval-Düsen aufgezeigt worden.
For the third time we were able to hold our PhD workshop "Research is Calling" on smart medical devices and systems, this time in Berlin again. This unique workshop brings together young scientists from computer science and medicine to provide a forum to discuss the very latest approaches to smart medical devices and systems. This year, for the first time, it is possible to publish corresponding workshop proceedings via the publication service of the Brandenburg Technical University (BTU). In our view, this format can create true interdisciplinarity because everyone presents their ideas and interim results to colleagues from a wide variety of disciplines and, conversely, hears and sees the latest from many other specialties. This forum is the vehicle for initiating new collaborations and planning joint research projects. The 'Cottbus project' emerged from personal partnerships between 'technicians' and 'physicians' and was planned from the beginning as a platform and an offer: as a platform for free and fully open scientific exchange and discourse, as an offer to all who are interested, also and gladly beyond Brandenburg. Begun as a "PhD Colloquium", Cottbus' "Research is Calling" is an ideas laboratory for young scientists. Cottbus is to establish a university medical faculty in the next few years as part of the structural change program following the coal phase-out. From our point of view, this lab is an important building block to establish cross-sectional issues right at the interface between medicine and technology, a culture of open discourse and scientific dialogue. The workshop covers the following topics in particular: Smart sensors for medical applications, Low-power wearable sensors, artificial intelligence for medical applications, medical robots, algorithms for medical applications, applications and case studies. Despite the pandemic situation the workshop could be held in presence. In five exciting presentations new ideas and cooperation possibilities were shown. Two keynotes (including Alina Nechyporenko, Marcus Frohme as special guests) and a dinner rounded off the program. At this point we would like to thank all participants, the reviewers, and the organizers, Stefan Scharoba and Kathleen Galke. We look forward to establishing this event as permanent and reaching an ever-growing audience.
"Forschung fördern, Lehre entwickeln, Versorgung stärken - für die Zukunft der Physiotherapie" war das Motto des 5. Forschungssymposiums Physiotherapie, welches durch die Brandenburgische Technische Universität Cottbus-Senftenberg (BTU) und die Deutsche Gesellschaft für Physiotherapiewissenschaft e. V. (DGPTW) am 26. und 27.11.2021 veranstaltet wurde.
Im Abstractband des 5. Forschungssymposiums Physiotherapie sind die Abstracts der eingereichten und beim 5. Forschungssymposiums Physiotherapie präsentierten Beiträge veröffentlicht. Zudem sind die veranstalteten Workshops zusammenfassend dargestellt.
The proposed solution meets the latest trends in world power engineering and has the lowest ecological costs amongst the accessible power engineering solutions. It is also in accordance with the Polish power engineering law, which takes into account the recommendations of the European Economic Commission, the Second Sulphur Protocol and the Framework Convention of the United Nations (concerning the changes of climate).
In the time of increased awareness about the environment problems by the public opinion and intensive international effort to reduce emissions of greenhouse gases, as well increase of the generation of electrical energy to facilitate industrial growth, the conference offers broad contribution towards achieving the goals of diversification and sustainable development. The scope of the Conference is to promote a Forum, where people involved with electrical power systems may exchange their experiences and present solutions found for actual and future problems. The conference offers prominent academics and industrial practitioners from all over the world the forum for discussion about the future of electrical energy and environmental issues and presents a base for identifying directions for continuation of research.
In recent years parcel volumes reached record highs. The logistics industry is seeking new innovative concepts to keep pace. For densely populated areas delivery robots are a promising alternative to conventional trucking. These electric robots drive autonomously on sidewalks and deliver urgent goods, such as express parcels, medicine, or meals. The limited cargo space and battery capacity of these vehicles necessitates a depot visit after each customer served. The problem can be formulated as an electric vehicle routing problem with soft time windows and a single unit capacity. The goal is to serve all customers such that the quadratic sum of delays is minimized and each vehicle operates within its battery bounds. To solve this problem, we formulate an MIQP and present an expanded formulation based on a layered graph. For this layered graph we derive two solution approaches based on relaxations, which use less nodes and arcs. The first, Iterative Refinement, always solves the current relaxation to optimality and refines the graph if the solution is not feasible for the expanded formulation. This is repeated until a proven optimal solution is found. The second, Branch and Refine, integrates the graph refinement into a branch and bound framework avoiding restarts. Computational experiments performed on modified Solomon instances demonstrate the advantage of using our solution approaches and show that Branch and Refine outperforms Iterative Refinement in all studied parameter configurations.
Nature protection has been a challenge for a long time due to continuous activities that reduced ecological processes and functions of the natural environment. These ecological processes and function provide huge benefits to humans and their communities known as Ecosystem Services (ES). ES are the benefits people derive from natural ecosystems. Many policy measures such as legal and voluntary protections have been used to preserve ES. But continuous increasing threats on the natural environment show that additional policy instruments are needed to achieve targets for environmental protection and sustainability. There are increasing land degradation, desertification, flooding, water shortage, climate change, which is mainly due to the sinks in ES. The problem is that ES are often considered as free goods making it different for their preservation. Even though tax policy for payment for ES has been used to encourage their preservation, they are reducing in supply. This is due to social dilemmas like differences in preferences, free riders and “tragedy of the Common” problems that are usually the case in resource distribution. Therefore tax systems may not lead to substantial preservation of ES. This has been argued on using utility theories and introduced market-base instruments for preserving ES as one way of achieving policy targets for nature protection. But for this Market for Ecosystem Services (MES) to grow, incentive and motivation schemes are needed to encourage multi-actors interaction in them. This has led to the establishment of a Community-based Financial Participation (CFP) framework as incentive and motivation schemes for business development for preserving ES. This thesis uses socio-economic and ecological concepts to argue for MES and developed a business modelling framework with Petri net. This involves multi-actors’ interaction for the demand and supply for ES (multi-agent interaction) that are modelled for estimating their flows over a landscape for supporting policy targets based on market structures. It also modelled future scenario for achieving environmental balancing for preserving ES and provide a management framework for MES. The management scheme comprises of an estimating model for ES, and models for management scheme and CFP. This provides the basis of using Petri net modelling framework for CFP to foster the growth of MES as options for preserving ES. Petri nets modelling techniques is used in simulating multi-agent interaction for the demand and supply of ES that are couple with management and CFP models to form a unified system approach. Petri nets have been used in many disciplines, but this is the first attempt in its use for modelling ES. CFP has also been developed with the framework of the research for this thesis. UNESCO Biosphere Reserve Spreewald (BRSW) in the Lusatian region of south Brandenburg in Germany is taken as an experimental area for testing the concepts and models developed within the thesis research. The results of this thesis show that MES is a potential for achieving targets for preserving ES, which can contribute to nature protection. This has been justified through data sampling, analytical schemes and management support systems that have been provided in the business modelling and simulation framework in this thesis.
A cellular approach to optimize the integration of renewable generation into distribution networks
(2022)
The steady growth of the renewable-based technologies in the last twenty years has changed the character of the power systems significantly. Until today, there are more than 112 GW installed photovoltaic and wind parks in Germany and around 90% of the installed renewable generators are integrated into distribution networks. As a result, distribution networks are often facing congestion problems and more investments are needed for the required network development plans.
The political decisions in Germany for increasing the share of renewables in electricity consumption up to 65% until 2030 and the nuclear phase out until 2022 and further shutdowns of the coal power plants raised serious concerns about the reliability of power supply and feasibility of the transition plan.
The present dissertation has a look over the recent developments and offers a methodology for reduction of the resulted costs from further integration of renewable generators into the distribution networks. The suggested methodology is based on a cellular approach and helps also to postpone the unnecessary costly network expansions. Furthermore, it helps to integrate the renewable generators in an optimized way which has an added value to move towards the defined sustainability goals.
The proposed methodology has two steps. The first step is made up of the cellular approach and grey wolf optimization in MATLAB environment. In this step, the optimal combination of technologies for fulfillment of the defined goals are found out. The second step consists of the quasi dynamic simulations in PowerFactory environment. In this step, the suggested results from MATLAB optimization are investigated in semi-real situations. With the quasidynamic simulations, it is checked whether the results are tolerable from the point of view of network operation and whether it is possible to facilitate the network operation with certain strategies.
The discipline of software engineering is increasingly shifting from classical design and development tasks towards tasks concerning reuse, adaptation, and integration. Driving motivations for this shift are (i) decreasing development time and costs and (ii) increasing quality of design results. Unfortunately, these new tasks are not yet supported sufficiently. While classical approaches to information system's design are quite well suited to a design from scratch, they do not provide powerful concepts concerning reuse. In particular, methods concerning encapsulation of dialog structures are commonly neglected. An according approach which enables reuse of dialog structures poses substantially different problems. This thesis formalizes such an approach which is essentially based on models from three research areas: (i) interaction patterns, (ii) interaction specification, and (iii) component frameworks.
Energy demand of continents, countries, communities and individuals will continue to increase in the phase of increasing population and improvement in the living standards of people. The attempt to meet this ever increasing demand and at the same time protect the environment has resulted in the fast growth of power generation from renewable sources of energy especially from wind through wind power plants and solar through photovoltaic power plants. This growth has been facilitated by various support schemes such as feed-in-tariff scheme, feed-in-premium and quota scheme. Further growth is expected in the future. This is because of the existing support schemes and the expectation of the emergence of improved technologies for harvesting renewable energy.
This development of power generation from renewable sources of energy although positive lead to some distinctive negative effects on the existing electrical network to which they are connected. These negative effects are known and well documented. The fluctuating nature of wind and solar radiation at any given location over a given period of observation is seen to translate into the power they feed into the power network. This fluctuating infeed requires more active management of the network by system operators so as to ensure continuous reliable power generation and delivery. Sometimes the management process lead to non-utilization of power produced by the renewables sources. Secondly, expansion and reinforcement of some existing networks are needed in other to accommodate renewable power generators. These come at a cost. Many studies and researches have been dedicated to finding solutions to these issues.
This work agrees with the use of storage systems as means of solving these issues but the question that remains unanswered is what the optimal way is. There is also a further push given to the view of installing renewable energy plants together with storage systems as a unit in this work. The main task presented in this work, however, is a concept of sizing renewable energy plant and storage systems as a unit. The resulting renewable energy plant-storage unit has the objective of supporting the electrical network to which it will be connected. Firstly the support should be by reducing the fluctuating effect from renewable production. Secondly by helping improve the load hosting capacity of the electrical network. This will be by supplying the part of the load demand leading to the reduction of the overall power drawn by connected loads from the electrical power network.
Historic data of renewable resource and also the load demand at the point or bus of connection are the drivers of this concept. With the earlier mentioned objectives and random or stochastic nature of data involved, particle swarm optimization method is employed in implementing the concept of sizing to arrive at an optimal solution of required sizes of the renewable energy plant-storage system.
The concept of sizing is based on proposing an ideal load demand that can be supplied by a utility under normal operating condition at all time. It follows that any extra demand should be supplied by the optimally sized renewable energy plant-storage unit. In this work sizing results of three scenarios presented. A single node network with three different types of the load was used in testing the effect of optimally sized renewable energy plant-storage system on an electrical network. The outcome of this test showed that the optimally sized renewable energy storage-system improved the ability of the test electrical network to support additional load hence load hosting capacity of test network was improved. The process required modelling and simulation all of which were carried out using MATLAB Simulink software.
A contribution to the online monitoring of partial discharges in high-voltage grid components
(2024)
Increasing utilization of HV power cable lines, and particularly the advent of long HVDC underground links, results in the need to sensitively monitor their condition, such as by tracking the emergence and development of partial discharges. This study demonstrates that existing solutions are poorly suited to the case of HVDC lines, and that a new, more sophisticated monitoring system needs to address a wide array of diverse problems. First of all, the overview of the task and main functional blocks of the monitoring system is given. Following this, selected blocks are subject to detailed examination in subsequent chapters.
The first of these blocks, a high-frequency current transformer (HFCT), is responsible for capturing the signal in the power line and transferring it to the electronics. This component receives in-depth coverage: general design considerations, computation of leakage inductance, operation in presence of a power current, resonant behavior, balanced design. Particular attention is given to the application of Finite Element Analysis (FEA) in relation to the HFCT, however, the demonstrated techniques can also be applied to other magnetic devices. Last section of the chapter presents various stages of development, experimental setups, prototypes, and the final device which has been put into series production.
The next block addresses extraction of signals from noise. A literature analysis is conducted concerning noise suppression in partial discharge recordings, and the application of the signal separation approach based on Linear Predictive Coding is shown.
In the section on localization, examples illustrating problems encountered during the development of a partial discharge localization algorithm are presented.
In the chapter devoted to laboratory tests, various auxiliary experiments conducted during the system's development are compiled, where some of them are: Time Domain Reflectometry (TDR) TDR-based line characterization, estimation of monitoring sensitivity, measurement of the cable attenuation and reflection coefficients of the accessories.
In the final chapter – field tests – the installation of the system on a 110 kV line and the measured transfer function are demonstrated.
This dissertation proposes a cross-layer framework able to synergistically optimize resilience and power consumption of processor-based systems. It is composed of three building blocks: SWIELD multimodal flip-flop (FF), System Operation Management Unit (SOMU) and Framework Function Library (FFL). Implementation of the building blocks is performed at circuit, architecture and software layer of the system stack respectively. The SWIELD FF can be configured to operate as a regular flip-flop or as an enhanced flip-flop for protection against timing/radiation-induced faults. It is necessary to perform replacement of selected timing-critical flip-flops in a system with SWIELD FFs during design time. When the system is active, the SWIELD FFs operation mode is dynamically managed by the SOMU controller according to the current requirements. Finally, the FFL contains a set of software procedures that greatly simplify framework utilization. By relying on the framework, a system can intelligently interchange techniques such as Adaptive Voltage/Frequency Scaling, selective Triple Modular Redundancy and clock gating during operation. Additionally, a simple and convenient strategy for integration of the framework in processor-based systems is also presented. A key feature of the proposed strategy is to determine the number of SWIELD FFs to be inserted in a system. Using this strategy, the framework was successfully embedded in instances of both single- and multicore systems. Various experiments were conducted to evaluate the framework influence on the target systems with respect to resilience and power consumption. At expense of about 1% area overhead, the framework is able to preserve performance and to reduce power consumption up to 15%, depending on the number of SWIELD FFs in the system. Furthermore, it was also shown that under certain conditions, the framework can provide failure-free system operation.
In wire-arc additive manufacturing (WAAM), the desired workpiece is built layerwise by a moving heat source depositing droplets of molten wire on a substrate plate. To reduce material accumulations, the trajectory of the weld source should be continuous, but transit moves without welding, called deadheading, are possible. The enormous heat of the weld source causes large temperature gradients, leading to a strain distribution in the welded material which can lead even to cracks. In summary, it can be concluded that the temperature gradient reduce the quality of the workpiece. We consider the problem of finding a trajectory of the weld source with minimal temperature deviation from a given target temperature for one layer of a workpiece with welding segments broader than the width of the weld pool. The temperature distribution is modeled using the finite element method. We formulate this problem as a mixed-integer linear programming model and demonstrate its solvability by a standard mixed-integer solver.
The article develops an analytical framework to explain the successes and failures of local community energy projects in the countryside. Theoretical elements based on ownership, technology acceptance, value chains and public opinions are developed and synthesised in two concepts: ´technical complexity and its antagonist social complexity. The achievement of a mature community energy regime is explained as a continuous process of consecutive single steps in both social and technical arenas.
Mobile cyber-physical systems (MCPSs) such as motor vehicles, railed vehicles, aircraft, or spacecraft are commonly used in our life today. These systems are location-independent and embedded in a physical environment which is usually harsh and uncertain. MCPSs are equipped with a wide range of sensors that continuously produce sensor data streams. It is mandatory to process these data streams in an appropriate manner in order to satisfy different monitoring objectives, and it is anticipated that the complexity of MCPSs will continue to increase in the future. For instance, this includes the system description and the amount of data that must be processed. Accordingly, it is necessary to monitor these systems in order to provide reliability and to avoid critical damage. Monitoring is usually a semi-automatic process while human experts are responsible for consequent decisions. Thus, appropriate monitoring approaches are required to both provide a reasonably precise monitoring process and to reduce the complexity of the monitoring process itself.
The contribution of the present thesis is threefold. First, a knowledge discovery cycle (KDC) has been developed, which aims to combine the research areas of knowledge discovery in databases and knowledge discovery from data streams to monitor MCPSs. The KDC is a cyclic process chain comprising an online subcycle and an offline subcycle. Second, a new data stream anomaly detection algorithm has been developed. Since it is necessary to identify a large number of system states automatically during operation, data stream anomaly detection becomes a key task for monitoring MCPSs. Third, the KDC and the anomaly detection algorithm have been prototypically implemented and a case study has been performed in a real world scenario relating to the ISS Colombus module.
Within the last decades, the number of social networks is growing fast. The competition of retaining the customers to grow their platform and increase their profitability is rising. That is why companies need to detect possible churners to retain these. The problem of predicting the users’ lifetime, churning users, and the reasons for churning can be tackled by using machine learning.
The goal of this bachelor thesis is to build machine learning models to predict user churn and the user lifetime within the social network Jodel, a location-based anonymous messaging application for Android and iOS.
To get the best possible prediction results, we have started with extensive literature research, whose approaches we have tested and added to a machine learning pipeline to build predictive models. With these models, we have investigated the performance after different observation time windows and have finally compared the strongest models to detect similarities and understand the insights to learn their behaviour.
The results of this thesis are machine learning models for a selected representative set of communities varying in size within the Kingdom of Saudi Arabia and a country model leveraging all data. These models are used for a regression task by predicting the lifetime of a user and a multi-label classification of a user into six different churn classes. Additionally, we have also given models for a binary classification, where the model will predict if the user will churn within a given time or not. These models have shown general strong predictive power, which is shrinking when limiting the observation time window. Especially the binary classification yielded high accuracy of over 99%.
The best models have been used for predicting user churn within other communities to detect communities with possible similar behaviour. These similarities then have been determined by features’ importance, where the most important features have got fed back into empirics. This has shown statistically significant differences between user groups with a different active time but as of today no clear trends were visible that had led us to define the communities’ behaviours.
Since the competition of social networks is still growing, the retaining of users will stay a core marketing strategy, which will need to be tackled by machine learning and artificial intelligence. The created models could be useful for predicting churning users within the platform Jodel to detect these customers that will churn within a given time.
Researches did not focus much on anonymous and location-based messaging. That is why the results of this thesis on the anonymous messaging application Jodel opens a variety of possible tasks for the future in this context.
Ungauged and data-scarce coastal river catchments, small and medium-sized ones in particular, are popular worldwide, especially in developing countries in Southeast Asia. In general, coastal river catchments are exposed to various coastal hazards such as fluvial floods, typhoons, and sea-level rise. In addition, climate change and socio-economic development will substantially change global flood risks. However, in scientific research, flood risk and future flood risk assessments in such coastal river catchments have not been significantly considered. Therefore, the overall objective of this thesis is to propose an innovative methodological framework for modeling and evaluating flood risk in such river catchments in the future under the impacts of climate change, sea-level rise, and land-use change based on using numerical models (hydrological models and land-use change models) and remote sensing data (satellite images and precipitation) in combination with other state-of-the-art methods, tools and models, and new approaches, such as flood risk assessment methods, regionalization methods, and statistical downscaling methods. The proposed framework was adopted, applied, and validated successfully for a case study - Tra Bong River Catchment - on the south-central coast of Vietnam as a test application. The main conclusion of this research is that the proposed framework can provide valuable information and projections of changing future flood risk associated with climatic and socio-economic changes in ungauged and data-scarce coastal river catchments. The proposed framework is designed with free model and method choices, meaning that it can apply different methods and tools for each step depending on the natural characteristics of river catchments, data collection, tools, and understanding of models, etc. Finally, this research can be used as a technical reference for designing and building national, regional, or local frameworks/guidelines for assessing future flood risk in ungauged and data-scarce coastal river catchments in Vietnam and other countries in Southeast Asia.
The design of embedded sensor node hardware systems is a challenging task driven by the increasing demands for low power, high efficiency, low cost and small size. These unique requirements make the usage of off-the-shelf general purpose microcontrollers fairly inefficient. For many wireless sensor network applications, the design of a dedicated low power sensor node microcontroller is the only way to answer specific application requirements. According to the trends in device, process and design technology, the development of sensor node devices is relying on a cheap planar bulk-CMOS technology, where power consumption is dominated by static power loss caused by high leakage currents. To keep the power at acceptable level, designers are compelled to apply the methodologies based on advanced low power techniques that target both static and dynamic power in the chip. The decisions made early in design phase are likely to determine the energy efficiency of the final design. Therefore, the choice of power saving strategy is the key challenge in designing energy-efficient sensor node hardware.
This work presents a methodology that assists designers meeting the critical design decisions regarding power, early in the design process. The presented methodology extracts the activity profiles of single system components and applies them in the developed models for energy estimation of particular low power implementation. The energy estimation models account for the energy overhead introduced by specific low power techniques, enabling comprehensive exploration of system’s energy efficiency in a given application scenario. Special attention is paid to the methodology utilization in typical wireless sensor network applications. Accordingly, the examples of activity profiling in wireless sensor node systems are presented. The proposed methodology is integrated within a power-driven design flow and applied to the design of an embedded sensor node microcontroller. This methodology is used to perform the cross comparison of alternative low power implementations for the target system architecture. The implementation relying on concurrent clock and power gating is selected as the most energy efficient and consequently realised. Power switching cells and power control logic have been designed and characterized. Also, the final system architecture, basic system components and applied design process are described. Finally, the developed power-gated sensor node microcontroller is implemented, fabricated and successfully tested. The chip measurements results are presented and analyzed.
The analysis of different low power approaches applied to the target system architecture has shown large impact of clock gating on the system energy. In a given application scenario, the clock gating implementation has reduced 72 times the dynamic energy and 12 times the total energy of the system. The implementation of power gating technique has gained 2.8 times reduction of the leakage energy and 2 times reduction of the total system energy compared to the clock gating only implementation. The analysis of two alternative power gating approaches has emphasized the significance of partitioning in power-gated design. A heuristic partitioning that combines two specific blocks having successive activity phases into a single power domain, thereby reducing design complexity and chip area, has been shown to have positive impact on the energy efficiency of the target design.
The design of high Q oscillators, using Crystals at lower frequencies, (and dielectric resonators at much higher frequencies), has long been considered a black art. This may be due to the fact that a systematic approach with optimized design guideline for crystal oscillators could not be found after extensive literature search.
In this dissertation, after analyzing the first crystal oscillator by W.G. Cady (1921), other high performance crystal oscillators will be discussed, analyzed and calculated.
A single transistor crystal oscillator design as used by HP (Hewlett Packard) in one of their designs, the HP10811A is considered in this thesis for mathematical analysis and CAD (Computer aided Design) simulation. This was also measured on state-of-the-art signal source analyzer. After validation, this design is scaled to 100MHz, the frequency of interest for this dissertation.
Though most designers use a single transistor based oscillator circuit, it is not an optimized design because of limited control over key design parameters such as loop gain, dc current etc.
This dissertation is an attempt to overcome the limitation due to the single transistor circuit and to give a step by step procedure, explaining the significance of a two transistor design with thorough analysis and design simulation results. This two stage transistor circuit is also not yet a best solution in terms of phase noise performance and output power, and some add-on circuitry will be needed for an optimized performance.
An important contribution of this work is to show that since the voltage gain is the ratio of the collector resistor and the emitter resistor, the performance is practically independent of the VHF transistor and gives better control over various parameters of the oscillator, in order to optimize the design.
A grounded-base amplifier is then introduced and added for improving the isolation and the output power. Unlike most oscillators, that take the output from the collector, a novel concept introduced by Rohde [14], is incorporated here, where the crystal is used as a filter that is then connected to the grounded base amplifier, a technique which many companies have been using. This dissertation will show that this technique increases the output power without significantly affecting the phase noise. Such a validation is needed for better understanding and as per my knowledge, has not been done so far.
For the oscillator, the tuning diode sensitivity and flicker noise contribution are also taken into consideration, by calibrating the mathematics and its validation is shown.
Crystal resonators of the type AT and stress-compensated (SC) cut devices will be considered as they give the best performance. The one port Colpitts type oscillator is considered first and the two port two transistor design later. Both will need a post amplifier/buffer stage.
A complete step by step design procedure for an optimized 100MHz crystal oscillator is then presented.
For completeness, CAD Simulation and Experimental results are provided for 10 MHz, 128 MHz and 155 MHz VCO circuits.
In many applications, like embedded systems or systems with a strong user interaction, the program is mainly controlled by events. An event handler waits for any event to occur, and then processes that event by ignoring it or calling a corresponding action, a procedure declared in the program. In this way, events are coupled with actions and can influence the global state of the whole program. In order to design a well structured program, event handling and corresponding actions should be clearly separated. However, this aim is not always ensured. In this thesis, an approach is introduced, which enforces to design event-driven systems into two main parts: - An event-handling part, also called specification part, and - An action part, also called hand-built program part (hbp). The specification part is defined as a declarative specification of the event-handling in a special language. It is separated from the hand-built program part. Every event can only influence the state of this part, which contains the implementation of control functions, which calls the several actions defined in the hand-built program part and so connects both parts together. The prototype of a framework was implemented which allows to specify the eventhandling part by means of a special editor and generates from it some classes and templates. In order to complete the implementation, the programmer has to fill into the templates program code by hand (therefore called hand-built program part), which describe the actions.
We deal with a very complex and hard scheduling problem. Several types of products are processed by a heterogeneous resource set, where resources have different operating capabilities and setup times are considered. The processing of the products follows different workflows, allowing also assembly lines. The goal is to process all products in minimum time, i.e., the makespan is to be minimized. Because of the complexity of the problem an exact solver would require too much running time. We propose a compound method where a heuristic is combined with an exact solver. Our proposed heuristic is composed of several phases applying different smart strategies. In order to reduce the computational complexity of the exact approach, we exploit the makespan determined by the heuristic as an upper bound for the time horizon, which has a direct in uence on the instance size used in the exact approach. We demonstrate the efficiency of our combined method on multiple problem classes. With the help of the heuristic the exact solver is able to obtain an optimal solution in a much shorter amount of time.
We address the single container packing problem of a company that has to serve its customers by first placing the products in boxes and then loading the boxes into a container. We approach the problem by developing and solving mixed-integer linear models. Our models consider geometric constraints that feature non-overlapping constraints, box orientation constraints, dimensionality constraints, relative packing position constraints, and linearity constraints. We also develop an extension of the models by integrating load balance and the deviation of the center of gravity. We tested the models on a broad set of real instances involving up to 41 boxes and obtained optimal solutions in most cases and very small gaps when optimality could not be proven.
Voltage controlled oscillators are commonly realized using varactor diodes in order to tune the resonator frequency. The drawback in practical implementation is the relatively high cost of the diodes, and the large space required for the inductors. Replacing the inductors by active tunable inductors would solve these issues and open a path for cost-effective small integrated oscillator designs. In the past, active-inductor approaches were not competitive due to the high phase noise inherent to the active inductor. This work investigates active inductor oscillators, and presents a novel approach that yields low phase-noise VCOs. The theoretical investigations are verified by measurements of demonstrator circuits.
This dissertation presents a novel technique for enhancing the spurious-free dynamic range of radio monitoring receivers with a bandwidth of several gigahertz. The improvement is based on suppressing the discrete spurious signals that occur at higher drive levels in the output spectrum of the required broadband analog-to-digital converter. The achievable improvement of the spurious-free dynamic range is typically more than 20 dB, allowing better, gap-free monitoring of wide frequency ranges. The attenuation of the spurious signals is achieved by a unique combination of two separate analog-to-digital converters working in parallel and subsequent digital signal processing. The developed solution is not limited to broadband radio monitoring receivers but can generally suppress certain types of spurious signals generated during analog-to-digital conversion.
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.
The search for textual information, e.g., in the form of webpages, is a typical task in modern business and private life. From a user's point of view, the commonly used systems have matured and established common interaction design patterns such as the textual input box that starts virtually every directed search process.
In comparison, the search for multimedia documents (e.g., images or videos) is still in its early years. In other words, a pre-dominant search strategy has not yet evolved. That is, directed and exploratory search approaches fight for user acceptance.
One further discriminative factor of multimedia information retrieval (MMIR) from traditional text-based information retrieval (IR) is that multimedia documents are not necessarily stored with the help of the same data access paradigm.
From a technical point of view, the use of different data access paradigms complicates the retrieval from such collections because the utilized retrieval model has to support these paradigms.
As a consequence, the main challenges in MMIR - the retrieval engine and the user interaction -- have to be addressed in a holistic way. A holistic theoretic perspective on MMIR/IR research is taken by principle of polyrepresentation (PoP), which forms one half of the theoretic background of this dissertation aiming at the development of a preference-based approach to interactive MMIR. Roughly speaking, the PoP theorizes that representations describing a document are based on various cognitive processes dealing with it, e.g., a title, its color or shape features, its creator, or its date of creation. This multitude of representations can be fused to form a conjunctive cognitive overlap (CO) in which highly relevant documents are likely to be contained. This explicit recommendation discriminates the PoP from typical feature fusion approaches often used in MMIR.
However, the PoP does not answer how a retrieval model has to be implemented in a technical sense which is of interest in the field of computer science. One possibility to implement the PoP are quantum mechanics-inspired IR models such as the commuting quantum query language (CQQL) which is used in this thesis.
CQQL is particularly interesting because it integrates data access paradigms used in the fields of DB and IR. In order to respect the dynamic nature of the search process and information need (IN), CQQL allows the personalization of retrieval results using a preference-based relevance feedback (RF) approach called PrefCQQL, which relies on machine-based learning.
Unique features of the PrefCQQL approach range from the support of negative query-by-example (QBE) documents at query formulation time as well as during the interactive retrieval process to the formulation of weak preferences between result documents to express gradual levels of relevance. In addition, inductive preferences can be used from query formulation time onward to learn new CQQL queries.
In order to evaluate the presented polyrepresentative PrefCQQL approach, two kinds of experiments are conducted: a Cranfield-inspired evaluation of CQQL/PrefCQQL's retrieval effectiveness, which is extended by the utilization of user simulations to better fit the requirements of the evaluation of an adaptive IR system, and a usability study that examines three alternative MMIR system UI prototypes. In order to increase the reproducibility and confirmability of the experiments, the source code to all used programs is made available as a supplement to this dissertation.
The mentioned experiments aim at answering two central questions: first, whether the hypotheses of the PoP can be verified in MMIR, and second, whether a usable interactive MMIR system can be built on the basis of the PoP and PrefCQQL?
To answer the first question, different matching functions that partly follow the recommendations of the PoP are evaluated with six different test collections in both an non-interactive and interactive QBE scenario. The results of this experiment are ambivalent.
In non-interactive MMIR, the experimental data does not provide sufficient justification for the statement that PoP-based matching functions will always surpass single features or other matching functions. For instance, the arithmetic mean, which calculates the average similarity between a query's representations and the documents' representations in the collection, surpasses the conjunction and hence the CO of multiple representations in terms of retrieval effectiveness. Nevertheless, the matching function following the PoP is effectiveness stabler than the best performing single representations per collection. Hence, the CO's retrieval performance is more reliable than the usage of single representations.
In contrast, the predictions of the PoP can be verified in the investigated PrefCQQL-based interactive MMIR scenario. However, it is important to note that also the number of available representations has an impact on the retrieval outcome. That is, if too few representations are present in a matching function, the corresponding IN model in PrefCQQL obviously becomes subject to underfitting eventually lowering its retrieval effectiveness. Unfortunately, when the point of sufficient representations to support PrefCQQL is reached could not be revealed in this dissertation.
The second question is answered with the help of a prototypical MMIR system: the Pythia system, which serves both as proof of concept of the CQQL and the PrefCQQL approach. Furthermore, the system supports different information seeking strategies and a seamless transition between them in order to support users with different kinds of IN.
In this paper, through a literature review, I clarify the meaning of public space and reflect on theoretical approaches to and methods of assessing the ability of historic public spaces to enhance social sustainability. I explain how the definition of public space and approaches to urban planning share concepts with social sustainability.
Finally, reflecting on examples of empirical research that attempt to
link physical and social components of public spaces, I point out the
methodological strengths and weaknesses in the field.
People in a social network are connected, and their homogeneity is reflected by the similarity of their attributes. For effective clustering, the similarities among people within a cluster must be much higher than the similarities between different clusters. Traditional clustering algorithms like hierarchical (agglomerative) or k-medoids take distances between objects as input and find clusters of objects. The distance functions used should comply with the triangle inequality (TI) property, but sometimes this property may be violated, thus negatively impacting the quality of the generated clusters.
However, in social networks, meaningful clusters can be found even though TI violates. One possibility is a quantum-logic-based clique-guided non-TI clustering approach. The commuting quantum query language (CQQL) is the base for this approach. The CQQL allows the formulation of queries that incorporate both Boolean and similarity conditions. It calculates the similarity value between two objects.
Furthermore, attributes may not have equal impact on similarity and affect the resulting clusters. CQQL incorporates weights to express the varying importance of sub-conditions in a query while preserving consistency with Boolean algebra. This enables personalization of results through relevance feedback (RF).
The main challenge of comparing clusterings is that there is no ground truth data. In such situations, human-generated gold standard clustering can be used. The question is how to compare the performance of clusterings. A noteworthy technique involves counting the pairs of objects that are grouped identically in both clusterings. By doing so, a clustering distance is calculated that measures the dissimilarity.
To validate the non-TI clustering approach, experiments are conducted on social networks of different sizes. Three central questions are addressed by the experiments mentioned: first, is it possible to find meaningful clusters even though TI violates; second, how does a user interact with the system to provide feedback based on their needs; and third, how fast do the detected clusters based on the proposed approach converge to the ideal solution?
To sum up, the experiments’ objective is to demonstrate the validity of a theoretical approach. The research findings presented here provide sufficient evidence for detecting meaningful clusters based on user interaction. Furthermore, the experiments clearly demonstrate that the non-TI clustering approach can be used as an RF technique in clustering.
With the introduction of the Internet at the end of the last century the modern society was fundamentally changed. Computer systems became an element of nearly all parts of our daily live. Due to the interconnection of these systems local borders are mostly vanished, so that information is accessible and exchangeable anywhere and at anytime. But this increased connectivity causes that physical fences are no longer an adequate protection for computer systems. Whereas the security of commodity computer systems was improved continuously and similarly with their increased connectivity, deeply embedded systems were then and now mostly protected by physical fences. But the ubiquitous availability of embedded systems in personal and commercial environments makes these systems likewise accessible and moves them strongly into the focus of security investigations.
Deeply embedded systems are usually equipped with tiny scale micro controllers, which are limited in their available resources and do not feature secure mechanisms to isolate system resources. Hence, a single error in a local software component is not limited to the component itself, instead the complete system may be influenced. The lack of resource isolation makes tiny scale systems prone for accidental errors but in particular vulnerable for a broad variety of malicious software. For a safe and secure operation of computer systems it is strongly recommended that software components are isolated in such a manner that they have access only to those resources, which are assigned to them. Even though a substantial number of approaches in the context of embedded system’s safety were investigated during the last fifteen years, security was mostly neglected.
This thesis is focused on security aspects where malicious software wittingly tries to bypass available protection mechanisms. The thesis introduces a security platform for tiny scale systems that enforces an isolation of software components considering security aspects. Due to the limited resources of tiny scale systems the proposed solution is based on a co-design process that takes the static and predefined nature of deeply embedded systems into account and includes hardware, compile-time, and run-time partitions to reduce the number of additional run-time components, to avoid performance drawbacks, and to minimize the memory as well as the components footprint overhead. To prove the applicability of the presented platform it was applied and evaluated with two real applications. In addition, an investigation of technologies of commodity computer systems that are suitable to build secure systems is presented. The thesis analyzes their enforcement based on the features provided by the introduced security platform. The contributions of this thesis include an enforcement of a security isolation of system resources on tiny scale systems and enable the development of a broad variety of secure tiny scale system applications.
More and more modern group oriented collaborative applications use the peer-to-peer (P2P) paradigm to be independent of expensive infrastructures as they are, for instance, provided for audio and video conferences by H.323 systems. Decentralized P2P systems better support spontaneity and mobility to set up meetings at varying locations or in ad hoc environments. This is especially advantageous for business communication over the Internet but also for other collaborative applications such as audio/video conferences. Decentralized collaborative P2P solutions require appropriate mechanisms to protect group privacy and data integrity. The broadly available security infrastructures, like virtual private networks (VPN) in the link, network, and transport layer, do not well fulfill the requirements regarding security, efficiency, and flexibility raised by a conferencing system. A dedicated security architecture in the application layer is, therefore, highly desired for protecting a P2P video conference. A centralized client/server based video conference system can be well shielded in a standard manner, whilst there exist no off-the-shelf approaches to specifying how to secure a P2P video conference up to now. This Ph.D. thesis addresses this urgent issue by presenting an effective and flexible security architecture and showing how it can be embedded into a P2P video conferencing system using the BRAVIS system as example. The cornerstone of the security architecture is the decentralized group key management. For this purpose, a new distributed key exchange protocol has been proposed. It is especially well suited for applications in real-time P2P settings for its higher efficiency than existing ones concerning the group key renewal delay. Furthermore, a novel video encryption algorithm has been developed to meet the strict real-time constraints required in a video conference. Its outstanding features include a good balance between security and efficiency, no impairment on video compression efficiency, and readily integration into the existing multimedia systems. These make it more practicable to encrypt video data than existing approaches.
A Simulation analysis to improve the dielectric strength inside High Voltage Vacuum Interrupters
(2015)
Vacuum circuit breakers are expected to be one of the possible alternatives for SF6 circuit breakers in transmission voltages up to 230kV because of the excellent insulation as well as environmental friendly characteristics of vacuum. But for higher voltages, maintaining the electrical insulation inside and outside the interrupter tube is very important and becoming a challenge for the design engineers. Normally a vacuum interrupter consists of metal shields sandwiched between the ceramic insulator blocks inside the tube. The primary purpose of these metal shields is to protect the insulator walls by avoiding metal vapor deposition during the arcing process. On the other hand, these metal shields also influence the electric field distribution inside the interrupter tube. The presence of the metal shields may reduce the dielectric strength of the interrupter tube if proper measures are not taken.
This research is devoted to provide the information about the possible areas inside and outside the interrupter tube that are considered as critical in terms of dielectric strength because of the presence of metal shields. Possible solutions are also given in this thesis to overcome the high field stress in these critical areas with the help of 2D simulations that are simulated in ANSYS Maxwell.
The critical areas and their respective solutions presented in this work are (1) unidentified edges outside the interrupter tube which are formed by the metal shields that are inserted between the ceramic blocks. These edges, at high field stress, may act as a source of discharges between the interrupter tube and the outer insulator. This problem can be reduced by the combination of using a pressurized insulating gas (which is in this case N2) between interrupter tube and outer insulator and by extending the unidentified edges and covering them with field grading rings which are conductive in nature. (2) Triple junctions (Vacuum-Ceramic-Metal shield) are the sources of high field stress inside the interrupter tube and are considered as a primary source of Secondary Electron Emission Avalanche that takes place on the (3) ceramic surface. The triple junction emissions can be avoided by properly designing the insulator geometry at point of contact with the metal shield. In addition, inserting metal parts of certain depth at the both ends of the ceramic insulators can also reduce the field stress at the triple junctions and avoid surface flashovers on the ceramic surface. (4) The gap between the metal shield and the contact rod is also considered to be a critical area which can be highly stressed (field) if the geometry of metal shield curvature is not properly designed. Various metal shield curvatures are proposed and simulated and an optimum geometry is suggested that reduces the electric field stress between the metal shield and contact rod. Using this optimized metal shield curvature, the diameter of the interrupter tube can be reduced considerably which in turn reduces the size of the interrupter tube.
Database caching techniques promise to improve the performance and scalability of client-server database applications. The task of a cache is to accept requests of clients and to compute them locally on behalf of the server. The content of a cache is filled dynamically based on the application and users' data domain of interest. If data is missing or concurrent access has to be controlled, the computation of the request is completed at the central server. As a result, applications benefit from quick responses of a cache and load is taken from the server. The dynamic nature of a cache, the need of transactional consistency, and the complex nature of a request make database caching a challenging field of research. This thesis presents a novel approach to the shared and parallel execution of stored procedure code between a cache and the server. Every commercial database product provides such stored procedures that are coded in a complete programming language. Given a request in form of such a procedure, we introduce the concept of split twin transactions that logically split the procedure code into two parts, say A and B, such that A is executed at the cache and B at the server in a simultaneous and parallel manner. Furthermore, we analyse the procedure code to detect suitable parts. To the best of our knowledge, this has not yet been addressed by any existing approaches. Within a detailed case study, we show that our novel scheme improves the performance of existing caching approaches. Furthermore, we demonstrate that different load conditions of the system require different sizes of the parts A and B to gain maximal performance. As a result, we extend database caching by a new dimension of optimization, namely by splitting of the procedure code into A and B. To solve this problem of dynamically balancing the code execution between cache and server, we define the maximum performance of a database cache over time and propose a stochastic model to capture the average execution time of a procedure. Based on the execution frequencies of primitive database operations, the model allows us to partially predict the response times for different sizes of A and B, hence providing a partial solution to the optimization problem.
We present a general numerical solution method for control problems with PDE-defined state variables over a finite set of binary or continuous control variables. We show empirically that a naive approach that applies a numerical discretization scheme to the PDEs (and if necessary a linearization scheme) to derive constraints for a mixed-integer linear program (MILP) leads to systems that are too large to be solved with state-of-the-art solvers for MILPs, especially if we desire an accurate approximation of the state variables. Our framework comprises two techniques to mitigate the rise of computation times with increasing discretization level parameters:
First, the linear system is solved for a basis of the control space in a preprocessing step. Second, certain constraints are just imposed on demand via the IBM ILOG CPLEX feature of a lazy constraint callback. These techniques are compared with an approach where the relations obtained by the discretization of the continuous constraints are directly included in the MILP. We demonstrate our approach on two examples: modeling of the spread of wildfire and the mitigation of water contamination. In both examples the computational results demonstrate that the solution time is significantly reduced by our methods. In particular, the dependence of the computation time on the size of the spatial discretization of the PDE is significantly reduced.
With further scaling of CMOS technology noise disturbance, mismatch and process variation become the major constraints of analog DC-DC converters. Consequently, digitally assisted DC-DC converters are coming in the focus of new systems, because they are easier to be configurated in the applications than the typical analog DC-DC converters, while being more robust against noise disturbance and process variation.
As interface devices between analog real world and digital signal processing, ADCs must be optimized for signals in digital DC-DC converters. But the existing synchronous ADCs, which require multiple clock cycles per conversion, as SAR and Pipeline ADCs, are not suitable for the application in DC-DC converters because of special signal characteristics. For stability reasons the digital feedback control in DC-DC converters requires a short group delay (dead time). So synchronous ADCs must be run at a sampling frequency as high as possible. But this approach results unfortunately in high power dissipation.
Compared to the above mentioned ADCs, the delta-encoded or Tracking ADC exhibits the shortest group delay by performing the data conversion only in one clock cycle. It makes the digital feedback control of DC-DC converters possible to response the output exactly and simultaneously. However, the synchronized Tracking ADC still has to cover the double of broad signal bandwidth of disturbance, which appears at the output of DC-DC converters occasionally, dissipating unnecessary excessive power.
This dissertation presents a new concept of Tracking ADC that selfadjusts the conversion rate depending on the slope of the input signal. For a slowly varying input, this Tracking ADC is self-clocked at a low frequency in normal mode, but once the signal varies fast and the slope exceeds a defined threshold, the conversion rate of the ADC is increased to track the signal accurately. By using the proposed solution not only the issue of input slope overload for typical Tracking ADCs is significantly improved, but also the average sampling rate is decreased. Therefore, the power dissipation of the proposed ADC is also reduced.
As a proof of this concept, a 6-bit Tracking ADC with transient-driven self-clocking is implemented in 0.13μm CMOS technology. The prototype of the ADC occupies an area of 400μm×200μm. The maximum power dissipation is 84μW at a supply voltage of 1.4V, when operated at 50MS/s. The integral nonlinearity (INL) is better than 0.5LSB, and the effective number of bits (ENOB) at the sampling frequency of 12.5MHz is 4.4 bits, where the ideal ENOB is limited to 5 bits for 6-bit Tracking ADCs.
We consider the mission and flight planning problem for an inhomogeneous fleet of unmanned aerial vehicles (UAVs). Therein, the mission planning problem of assigning targets to a fleet of UAVs and the flight planning problem of finding optimal flight trajectories between a given set of waypoints are combined into one model and solved simultaneously. Thus, trajectories of an inhomogeneous fleet of UAVs have to be specified such that the sum of waypoint-related scores is maximized, considering technical and environmental constraints. Several aspects of an existing basic model are expanded to achieve a more detailed solution. A two-level time grid approach is presented to smooth the computed trajectories. The three-dimensional mission area can contain convex-shaped restricted airspaces and convex subareas where wind affects the flight trajectories. Furthermore, the flight dynamics are related to the mass change, due to fuel consumption, and the operating range of every UAV is altitude-dependent. A class of benchmark instances for collision avoidance is adapted and expanded to fit our model and we prove an upper bound on its objective value. Finally, the presented features and results are tested and discussed on several test instances using GUROBI as a state-of-the-art numerical solver.
Die Gefährdung der menschlichen Gesundheit und der Umwelt durch Eisencyanidkomplexe hängt hauptsächlich von der potenziellen Bildung der äußerst toxischen leicht freisetzbaren Cyanide ab. Die Autorin untersucht das Abbauverhalten der komplexen Cyanide an deinkingschlammhaltigem Kompost, in dem die Cyanide als Eisen(III)-hexacyanoferrat(II), auch bekannt als Berliner Blau, vorliegen. Im Detail werden der Einfluss der Photolyse, der Hydrolyse, des pH- und Redox-Milieus und biologischer Prozesse auf das Verhalten der Eisencyanidkomplexe untersucht. Die Ergebnisse zeigen, dass die Persistenz der photolytisch freigesetzten Cyanid-Ionen begrenzt ist. Demzufolge stellen sie kein Gesundheitsrisiko für den Menschen dar und können keine toxische Wirkung in biotischen Systemen entfalten. Im Sinne des Bundes-Bodenschutzgesetzes (BBodSchG) sind die als Berliner Blau vorliegenden Eisencyanidkomplexe nicht in der Lage, die Bodenfunktionen oder den Wasserkreislauf nachhaltig zu schädigen.
Mit der Altholz-Verordnung wurden bundesweit einheitliche Anforderungen an die Entsorgung von Altholz und verbindliche ökologische Standards vorgegeben. Altholz soll in Abhängigkeit von der Belastung mit Schadstoffen in eine von vier Kategorien eingeteilt werden, von A I (naturbelassenes oder nur mechanisch bearbeitetes Altholz) bis zu A IV (mit Holzschutzmitteln behandeltes Altholz). Diese Altholzkategorien werden bestimmten zulässigen Verwertungsverfahren zugeordnet. Die Handhabung von Altholzabfällen ist jedoch nicht nur Gegenstand des Gesetzes zur Förderung der Kreislaufwirtschaft und Sicherung der umweltverträglichen Beseitigung von Abfällen (KrW-/AbfG), sondern auch des Gesetzes zum Schutz vor schädlichen Umwelteinwirkungen durch Luftverunreinigungen, Geräusche, Erschütterungen und ähnliche Vorgänge (BImSchG). Dies gilt sowohl für die stoffliche Verwertung als auch für die energetische Verwertung von Altholzabfällen. Solche Anlagen unterliegen den Vorschriften nach Abschnitt Nr. 8 des Anhangs der Vierten Verordnung zur Durchführung des Bundes-Immissionsschutzgesetzes – Verordnung über genehmigungsbedürftige Anlagen – (4. BImSchV). Im Fall der energetische Verwertung von Altholzabfällen gilt dies in Verbindung mit Bestimmungen der Technischen Anleitung zur Reinhaltung der Luft (TA Luft), der Dreizehnten Verordnung zur Durchführung des Bundes-Immissionsschutzgesetzes – Verordnung über Großfeuerungsanlagen – (13. BImSchV) oder der Siebzehnten Verordnung zur Durchführung des Bundes-Immissionsschutzgesetzes – Verordnung über Verbrennungsanlagen für Abfälle und ähnliche Stoffe – (17. BImSchV). Folge davon ist: Bestimmungen der Altholz-Verordnung unterscheiden sich vom Bundes-Immissionsschutzgesetz z. B. im Hinblick auf Schadstoffgrenzen. In Feuerungsanlagen, die nicht für alle Altholzkategorien zugelassen sind, kann eine energetische Verwertung von Altholzabfällen nach den Bestimmungen der AltholzV erfolgen, soweit der Anteil höherer Altholzkategorien 2 % nicht übersteigt. Emissionen z. B. an Halogenwasserstoffen (HCl, HF) der energetischen Verwertung von Altholzabfällen mit typischerweise höheren Belastungen, werden durch die Art der Feuerung nur bedingt beeinflusst. Sie ist überwiegend brennstoffbedingt. Emissionen der erheblich z. B. mit chlor- und flourhaltigen Stoffen belasteten Altholzabfälle können in der Regel nur durch technische Minderungsmaßnahmen herabgesetzt werden. Vernachlässigt wird jedoch, dass genehmigungsbedürftige Anlagen zum Zweck der energetischen Verwertung von Altholzabfällen stets nur für Regelbrennstoffe zugelassen sind. Sie sind somit nicht für Altholzabfälle höherer Kategorien zugelassen, auch nicht bis zu 2 %. Denn diese Feuerungsanlagen verfügen dann nicht über geeignete technische Minderungsmaßnahmen. Die Verbrennung von Alternativbrennstoffen oder höherer Altholzkategorien, die nicht als Regelbrennstoffe zugelassen sind, ist nicht von der Genehmigung erfasst. Dieser immissionsschutzrechtliche Grundgedanke dient dem Schutz vor schädlichen Umwelteinwirkungen und erheblicher Nachteile oder erheblicher Belästigungen der Allgemeinheit oder Nachbarschaft. Im Vergleich mit der Altholz-Verordnung besteht damit aus immissionsschutzrechtlicher Sicht eine deutliche Missbrauchsanfälligkeit. Die Missbrauchsanfälligkeit kann zu strafrechtlichen und zivilrechtlichen Konsequenzen führen. Die Zielsetzung der vorliegenden Arbeit besteht im Aufzeigen der Missbrauchsanfälligkeit zum einen. Zum anderen ist die Zielsetzung mit Maßnahmen ihrer Vermeidung verbunden. Dies erfolgt anhand von grundlegenden juristischen und technischen Sachverhalten.
Unkompliziertes und schnelles Suchen und Finden der passenden Weiterbildung über eine Plattform kann zur digitalen Verstärkung der beruflichen Weiterbildung dienen. Auf die Konzeption und Gestaltung so einer Plattform zielt der vom Bundesinstitut für Berufsbildung organisierte und über die Nationale Weiterbildungsstrategie des Bundesministeriums für Bildung und Forschung geförderten Innovationswettbewerb INVITE ab (Ertl, 2021).
Das Projekt „Expand+ER WB³“ als Teil des Innovationswettbewerbs INVITE zielt darauf ab, innovative Zugänge zu digitalen Lernangeboten auf der Basis der Weiterbildungsdatenbank Berlin-Brandenburg (WDB-Suchportal) zu schaffen. Die Datenbank wird von der Wirtschaftsförderung des Landes Brandenburg und der Europublic GmbH betrieben.
Um Weiterbildung gezielt anbieten zu können, sind im Rahmen des Expand+ER WB³-Projekts berufliche und wissenschaftliche Weiterbildung abzugrenzen und die Schnittstellen zwischen beiden zu identifizieren.
Die vorliegende Arbeit beschäftigt sich mit der Entwicklung eines vereinfachten mechanischen Ersatzmodells für strukturierte Bleche. Diese bewirken durch ihre eingebrachten Formen eine Verbesserung der Bauteilsteifigkeit und des Beulverhaltens und versprechen somit hohes Potenzial hinsichtlich industrieller Anwendungen im Leichtbau. Zunächst wird ein Einblick in die theoretischen Grundlagen gegeben, welche essentiell für das Verständnis der Arbeit sind. Anschließend wird ein vereinfachtes Ersatzmodell entwickelt, welches auf Basis von Homogenisierungsprozessen anisotrope Materialparameter beschreibt, um das elastische Verhalten großer Strukturen aus strukturierten Blechen berechnen zu können. Für die Ersatzkennwerte werden Symmetrie- und Randbedingungen an Elementarzellen betrachtet, deren strukturmechanisches Verhalten repräsentativ bestimmend ist. Die Bestimmung eines solchen Repräsentativen Volumenelements (RVE) stellt die Basis der Homogenisierungsmethode dar. Mithilfe des Ersatzmodells wird eine effiziente numerische Auslegung gewährleistet. Der anschließende Vergleich mit experimentellen Ergebnissen unterstützt die Validierung des vereinfachten Ersatzkontinuums.
Cultural landscapes have become categories of increasing use in the nominations to the World Heritage, because they provide frameworks for the integration of alternative understandings of heritage into the List. Nevertheless, the concept of cultural landscape takes its roots within a Western naturalist ontology. By assuming this ontology the interpretation of heritage sites is based on the division between nature and culture. The lack of a model of protection designed for the integration of all categories of heritage is evident, with the models used following the culture/nature and tangible/intangible divides.
In order to study this problem, a comparative approach has been used. Two sites from mountain areas have been selected as case studies. The Ordesa and Monte Perdido National Park in Spain has been part of the transnational mixed cultural and natural heritage property in the World Heritage List Pyrenees/Mont Perdu since 1997, shared with France. The Archaeological Park of Ollantaytambo, neighbor to the Sanctuary of Machu Picchu in Peru, is included in the serial and transnational property Qhapaq Ñan/Andean Road System inscribed in the List in 2014. These sites are protected under two different models: the first focused on the conservation of nature and the second on the conservation of the past. Nevertheless, both sites have been nominated as cultural landscapes based on the presence of Intangible Cultural Heritage maintained by agropastoral communities inhabiting them. The focus is to put in question the relevance of the concepts of conservation and sustainability in these contexts and to propose landscape management as an alternative that implies maintenance and at the same time adaptation to change.
The methodological design is based on a qualitative approach. The focus is the analysis of the ‘emergent landscape management’, defined as a self-organized process resulting from the interactions between the most influential actors in landscapes – the state, local communities and visitors -, ultimately leading to synergies between these actors’ practices.
The results show that, first, the diversity of approaches to the notion of “landscape” entails the lack of precision of the object to be conserved. The definition set in the Operational Guidelines of the 1972 World Heritage Convention presents the concept from different epistemological perspectives. Contrasted with the criteria under which these sites have been justified as World Heritage Cultural Landscapes, an inherent contradiction is evident between the models of protection and the continuity of the way of life of local communities that represent their heritage value. Second, three landscapes have been identified based upon the model of the emergent landscape management: the landscape as a container; the landscape as habitat; and the landscape as picture. Three sets of maps, corresponding with each group of actors portray the results. Nevertheless, the groups and its understandings are not close. Key actors have been found playing roles in different groups. An overlay of the maps shows the potential for common ground connected by the key actors. Finally, even if these sites represent particular cases, they exemplify the need to reflect upon the inherent contradictions of the current conservation system. In order to develop comprehensive strategies for the viability of cultural landscapes alternatives for the continuity and autonomy of local communities need to be reflected upon.
A classic approach for solving differential equations with neural networks builds upon neural forms, which employ the differential equation with a discretisation of the solution domain. Making use of neural forms for time-dependent differential equations, one can apply the recently developed method of domain segmentation. That is, the domain may be split into several subdomains, on which the optimisation problem is solved. In classic adaptive numerical methods, the mesh as well as the domain may be refined or decomposed, in order to improve the accuracy. Also, the degree of approximation accuracy may be adapted. Therefore, it is desirable to transfer such important and successful strategies to the field of neural-network-based solutions. In the presented work, we propose a novel adaptive neural approach to meet this aim for solving time-dependent problems. To this end, each subdomain is reduced in size until the optimisation is resolved up to a predefined training accuracy. In addition, while the neural networks employed are by default small, we propose a means to adjust also the number of neurons in an adaptive way. We introduce conditions to automatically confirm the solution reliability and optimise computational parameters whenever it is necessary. Results are provided for several initial-value problems that illustrate important computational properties of the method.
In this work Adaptive Polynomial Tabulation (APT) is presented. It is a new approach to solve the initial value chemical rate equation system. In this approach zeroeth, first and second order polynomials are used in real-time to approximate the solution of the initial value chemical rate equation system. The sizes of the local regions encountered for the different orders of polynomial approximation are calculated in real-time. To improve accuracy the chemical state space is partitioned into hypercubes. During calculations the hypercubes accessed by the reactive mixture are divided into adaptive hypercubes depending on the accuracy of the local solution. Mixture initial conditions are stored in the adaptive hypercubes. Around each stored initial condition two concentric ellipsoids of accuracy (EOA) are defined. These include the ISAT and identical EOAs. The time evolution of mixture initial conditions which encounter an identical and ISAT EOA are approximated by zero and first order polynomials respectively. With a certain number of stored initial conditions within an adaptive hypercube, its second order polynomial coefficients are constructed from the stored initial conditions. The time evolution of additional mixture initial conditions that encounter this adaptive hypercube are approximated with second order polynomials. The APT model is simplified by the replacement of the entire set of species mass fractions with a progress variable based on the enthalpy of formation evaluated at 298 K. APT has 3 degrees of freedom which include the progress variable, total enthalpy and pressure. The APT model was tested with a zero dimensional Stochastic Reactor Model (SRM) for HCCI engine combustion. A skeletal n-heptane/toluene mechanism with 148 chemical species and 1281 reactions was used. In the tests, the HCCI engine simulations using APT were in very good agreement with the model calculations using the ODE solver. The cool flame and main ignition events were accurately captured. The major and minor species were also accurately captured by APT. In SRM-HCCI calculations without cyclic variations, a computational speed up factor greater than 1000 was obtained when APT was used for all the operating points considered without significant loss in accuracy. For the SRM-HCCI engine calculations with cyclic variations, APT demonstrated a computational speed up exceeding 12 without significant loss in accuracy.
Additive technologies are now widely used for the production of complex precise parts and have high potential for the production of forming dies. In this work, hot-forming dies optimized for additive manufacturing were developed and produced with wire arc direct energy deposition (WA-DED) and laser powder bed fusion (L-PBF) technologies. The concept of lightweight hot-forming dies with a 2D-lattice structure was developed, which reduced the weight of each die by 56%, from 14.2 kg to 6.1 kg, in production using L-PBF. Maraging/precipitation-hardened steel 17-4PH was used as an alternative to traditional hot-working steels with slightly lower mechanical properties and a much higher processability in the additive manufacturing process. The workability of the manufactured dies was confirmed by forging tests on an industrial screw press.
Recent advances in additive manufacturing offer promising opportunities for the fabrication of structures on existing micro-(opto-acoustic )electro-mechanical systems, i.e., chips. This is of particular significance in research and development due to the adaptability and adaptation speed of additive manufacturing. These advantages provide the ability to individualize the fabrication of structures and to enable the rapid prototyping approach. The combination of additive manufacturing on chip already enables current research, especially in photonic and microfluidic fields. Despite this, additive manufacturing on chip has never been applied to acoustic sensors or micro-positioning chips. Such devices could benefit from the mentioned advantages, especially for the fabrication of beam shaping waveguides, packaging, grating and end effector structures. Additive manufacturing by two-photon polymerization lithography gathers interest in industry and research due to its capabilities for the fabrication of structures with minimum feature sizes beyond the diffraction limit. The objective of this work is the investigation of additive manufacturing on chip by two-photon polymerization lithography at the example of an acoustic sensor and a micro-positioning chip. One of the greatest challenges is posed by the optical, thermodynamic, adhesion and alignment effects, which are introduced to the fabrication process by these complex substrates. Optical and thermodynamic models were established, and simulations were performed, culminating in a compensation method to address these effects, which was verified by parameter studies. The substrate alignment was investigated via optical technique, resulting in the development, manufacturing and verification of a novel alignment upgrade to the fabrication system employed in this work. The influence of process materials posed another challenge, as they led to chip performance alterations and restrictions. Chips treated with these materials were characterized, e.g., using high frequency optical microphones. Owing to the high precision of the alignment upgrade and the compensation method developed in this work, additive manufacturing on chip using two-photon polymerization lithography on the investigated devices was reported for the first time and presented for expedient examples, e.g., waveguides, end effectors and gratings. The residue contamination was determined as the main origin of the exhibited performance issues. Development strategies were recommended for further research, to enable additive manufacturing on chip insensitive to residual materials. In this work, the requirements for additive manufacturing on chip were illustrated and the fundamental arrangement to enable the rapid prototyping approach as well as design individualization were demonstrated. The compensation methods developed in this work facilitate upcoming research on desirable chip types that form the basis for optical and microfluidic applications.
The state of the art in aero engine design and analysis methods is based on mature computer programs, which have been developed during several decades. The classical approach to the preliminary design phase of engine subsystems is to split the complex engineering process into disciplines and subtasks. Different experts manage the time-consuming modelling work. Due to the increasing demand for higher aero engine performance and design cycle time reduction, process integration, accuracy and agility have become key assets of the engineering work-flow.
The intention of this work is to show how multi-disciplinary integration, work-flow automation and CFD-enhanced thermal modelling methods can be used efficiently to support the aero engine preliminary design phase, with focus on the high pressure turbine subsystem. A Java based common design environment for the engine secondary air system, rotors and thermal design disciplines has been developed. This design environment enables the automatic generation of CAD, flow network and thermal models.
The improvements in terms of process agility and model prediction accuracy are demonstrated with the application of the implemented process to a reference high pressure turbine subsystem. For validation purposes, the preliminary design definition of the reference turbine case is reproduced. The automatically generated secondary air system and thermal models can replicate the same level of detail as the previous manual approach. It was found that the CFD-enhanced thermal model improves the prediction accuracy in the preliminary design stage, when no engine test data is available.
The aim of this work was to study in detail the physical-chemical aspects of water and wastewater treatment using different so-called “advanced oxidation systems”. Our target was to construct an annular multiphase falling film reactor with a fixed photocatalyst (TiO2) and to compare its performance with that of a planar reactor in different chemical oxidation regimes. The annular design of the falling film reactor was prepared for heterogeneous photocatalytic oxidation systems by combining three different phases (solid fixed photocatalyst, falling liquid wastewater and an ozone/oxygen gaseous mixture). UVA light sources were employed for irradiation of the photocatalyst surface. In the first step, the design, construction and characterisation of the reactor was performed. The next step was the assessment of the performance of the falling film reactor in the decomposition of selected organic chemicals as model compounds. Six different oxidation methods were evaluated for the degradation of model compounds. Photo-oxidation (UVA/O2), photo-ozonation (UVA/O3), ozonation (O3), catalytic ozonation (TiO2/O3), photocatalytic oxidation (TiO2/UVA/O2) and photocatalytic ozonation (TiO2/UVA/O3) processes were investigated in this study. It was shown that due to the synergetic effects between ozone molecules and the irradiated surface of TiO2, photocatalytic ozonation was the most effective oxidation process for the decomposition of model compounds. Oxalic acid, dichloroacetic acid, citric acid, terephthalic acid, p-chlorobenzoic acid, methyl tert-butyl ether, ethyl tert-butyl ether, tert-amyl ethyl ether and tert-butanol were chosen as model compounds. Two different immobilisation techniques were employed and evaluated for fixing TiO2 nanoparticles onto the reactor walls. The immobilisation of photocatalysts was performed on borosilicate glass and polymethylmethacrylate. It was observed that the photoactivity of fixed TiO2 particles on borosilicate glass was higher than that on polymethylmethacrylate. The stability of immobilised photocatalysts on both substrates was good. The influences of different experimental parameters, such as the initial concentration of model compounds, ozone concentration, solution pH, temperature and solution recycling rate on the degradation rate and efficiency of the oxidation systems were studied and discussed. In terms of the characterisation of the falling film reactor, different aspects were studied. The thickness and distribution pattern of falling films, the gas washing effects of falling films, the absorption of ozone in the falling films, the adsorption of organic pollutants on the photocatalyst surface, the effect of UVA irradiation on ozone decomposition, etc. were studied in detail. The concentration of model compounds was determined by ion chromatography (IC), high performance liquid chromatography (HPLC) and headspace techniques. Chemical oxygen demand (COD) was applied to quantify the quality of wastewaters and total organic carbon (TOC) measurements were employed for the determination of model compound mineralisation. At the end of this study, treatment of real wastewater was performed by means of the falling film reactor as a case study. The real wastewater was produced in a pyrolysis process. More than 30 organic and inorganic compounds were included in the composition of this wastewater. The application of ozone-based advanced oxidation processes showed good results in terms of colour and odour removal of pyrolysis wastewater as well as in terms of decreasing its COD.
For more than a decade, the interconnected structures of the Buddhist earthen heritage in Wanla village/Ladakh, illustrated most prominently by the historic Avalokiteshvara Temple, have been researched, conserved, and restored by the NGOs Achi Association and Achi Association India. In the fifteen articles of this publication, the interdisciplinary team of architects, art conservators, conservation scientists, art historians, and archaeologists present the results of their work with the village community for the preservation of this exceptional cultural heritage. They provide insights into a training programme for young people interested in their heritage, and explain the art historical details, construction techniques, building materials, building archaeology, and state of conservation of these structures, as well as the iconography of art works. This is all enriched by the conservation reports and documentation of several buildings.
All these efforts combined three major approaches: a fabric-based and a value-based analysis and assessment, along with a people-centred conservation.
Agentenbasierte Modellierung und Simulation der Rettungskette : eine Fallstudie in der Lausitz
(2022)
Ein funktionierender Rettungsdienst ist für die Gesellschaft von zentraler Bedeutung, da in medizinischen Notsituationen die Gesundheit eines Verunfallten von der Qualität der praäklinischen medizinischen Versorgung abhängt. Dabei steht man vor immer neuen Herausforderungen des sozioökonomischen Wandels und technischen Fortschritts, die neue Ansätze zur Systemoptimierung erfordern. Diese Arbeit beinhaltet eine Literaturübersicht über Planungsprobleme, sowie eine Klassifizierung von Emergency Medical Service (EMS) Systemen. Ein agentenbasiertes Simulationsmodell für ein notarztbasiertes EMS-System wird vorgestellt und auf die Rettungskette eines städtischen Gebietes Cottbus, Brandenburg, Deutschland angewandt. Die Parametrisierung des Modells erfolgt durch zugrundeliegende Einsatzdaten, dabei wird ein Geoinformationssystem (GIS) genutzt, Notrufe über die Bevölkerungsdichte mit einer zeitabhängigen Rate generiert und statistische Kenngrößen des Systems ausgewertet. Das in AnyLogic implementierte Simulationsmodell enthält eine graphische Nutzeroberfläche, in der Einsatzdetails und Statistiken als Grundlage für Anwendungen in der Praxis angezeigt werden.
Fasermaterialien gewinnen zunehmend in unterschiedlichen technischen Anwendungsbereichen an Bedeutung. Insbesondere der Einsatz von nachwachsenden Rohstoffen, meist in Form von pflanzlichen Fasern, stellt hierbei durch ihre endliche Länge eine Herausforderung an die Aufbereitungstechnik, um eine problemlose Lagerung, Transport sowie Zufuhr und Dosierung in weiterführende Anwendungs- bzw. Weiterverarbeitungsprozesse zu ermöglichen. Der Schritt zur Erzeugung eines Schüttgutes aus voreingestellten Faserlängen wird in der Anwendung von Agglomerationsprozessen gesehen. In den durchgeführten Untersuchungen kam neben der Aufbauagglomeration (Mischagglomeration) das innovative Verfahren der Rollagglomeration zum Einsatz. Für eine Charakterisierung der Faseragglomerate bzw. zur Bewertung des Herstellungsprozesses wurden entsprechende Möglichkeiten der Analyse des Einzelkörpers betrachtet, welche für die Qualitätssicherung späterer Produktionen anwendbar sind. Aus den Erkenntnissen der durchgeführten Untersuchungen werden Weiterentwicklungsansätze von der Laboreinheit hin zur Technikumsanlage abgeleitet, welche für anwendungsorientierte Untersuchungen erforderliche Produktionsvolumina aufweisen.
Regular electricity access is a key element for the economic development and social welfare of rural areas. Decentralized energy generation has the advantage of using local resources, increasing employment and reducing transmission and distribution losses. Brazil is a tropical country, endowed with vast arable land, plentiful precipitation levels, and a large supply of human labour. Furthermore, it has strong regional distinctions with geographical, cultural and economical differences. Forestry and agriculture, important activities in the Brazilian economy, are dependent on local people and are deeply connected to traditions, nature and culture. Furthermore, these activities generate a significant amount of residues that could be used in conversion technologies for biomass, based on type, availability and market demand. When biomass were used to generate energy locally, community members could have business opportunities, improving local economy and life quality of individuals while diversifying the Brazilian energy matrix, which is mostly based on hydropower. Alternatives for implementing small-scale decentralized biomass schemes are dependent on the screening of the existing biomass supply chains, the implementation of adapted technologies for local conditions and the exploration of local resources. The present research carried out a detailed field work in order to evaluate the potential of Brazilian biomass in different regions. The author identified crucial needs, usual constraints and possible challenges of rural electrification and economic development in Brazil. Several case studies and social groups were investigated in the Federal States of Minas Gerais, São Paulo and Pará to identify different resource management strategies, which biomass technology was applied and the needs of the local population. It was concluded that the compaction of biomass to generate solid biofuels with uniform properties could be a cost-effective alternative for communities taking advantage of the resources available in the region to produce energy. Nevertheless, each case has to be considered on its own. It was concluded that energy supply and consumption should be addressed through integrated research. Scientific research should be focused on technological solutions for improving living standards and socio-economic development in rural areas. The implementation of new regulatory arrangements and a constant revision of the Brazilian energy policies are crucial for encouraging a national industry for renewables. It was also concluded that the cultural, geographical and socio-economic discrepancies of Brazil could involve challenges for the implementation of future projects, even when their development would provide benefits for Brazil as a whole.
Die vorliegende Publikation präsentiert Ergebnisse von 55 Studierenden des Bachelorstudiengangs Städtebau und Stadtplanung aus dem Modul „Stadtmanagement 1, Vermittlung von Planung, Wohnungswirtschaft (SPB3)“, das im Wintersemester 2022/2023 am Fachgebiet Stadtmanagement der BTU Cottbus-Senftenberg stattgefunden hat.
Aluminium based micro mirrors exposed to UV laser light – in situ performance and degradation
(2014)
The present thesis characterises aluminium based micro mirrors exposed to UV laser light. Such micro mirrors, used in highly integrated spatial light modulators, can for example be used as programmable masks in DUV micro lithography. Therefore they are sensitive to any performance loss arising from material degradation or changes in the mirror curvature. The key question addressed in this thesis is the investigation of the in situ curvature change, which means characterisation during a real laser irradiation. For this purpose a measuring station was designed, combining a phase-shift interferometer, an optical microscope and the laser irradiation of the sample at 248nm. The Phase-shift interferometry technique used is a very sensitive contactless optical measurement principle, which allows a resolution of the sample surface in the single-digit nanometer range.
A multitude of irradiation tests were performed to describe the change of mirror curvature as a function of different irradiation parameters such as the pulse energy, the laser repetition rate or the ambient atmosphere. The most significant effect was detected by the variation of the applied pulse energy, which was in the range of 10⁻⁵J/cm²-10⁻²J/cm². A general conclusion was that a minimum energy of 10⁻⁵J/cm² at a repetition rate of 1kHz is required to detect any laser induced change of the mirror curvature. At higher energy levels two characteristic behaviours can be distinguished. Up to a level of 10⁻³J/cm² the mirrors show a permanent concave bowing in the range of λ/100. A further increase of the pulse energy causes an accumulating bowing in the opposite direction (convex) of λ/10 within some ten million laser pulses. However this convex bowing partially relaxes after the irradiation is stopped.
Another aspect of the thesis was the determination of laser induced material degradation. For this purpose irradiated mirrors were investigated by means of different devices and analytical techniques such as atomic force microscopy (AFM), reflectometry and transmission electron microscopy (TEM). The AFM analysis showed a slight increase of surface roughness and a directional change of the grain size. As a result of the TEM analysis it turned out that arrangement and shape of the grains seems not to have changed. But after the irradiation the growth of a porous oxide layer up to 20nm on the upper mirror surface was noticed.
Finally different hypotheses are proposed to explain the mechanisms behind the observed concave and convex bowing at particular pulse energies. In this connection it is assumed that the mirrors at pulse energies larger than 10⁻³J/cm² do not show a static bowing at all. It is rather assumed that the mirror bow oscillates with the laser repetition rate.
In der Promotionsarbeit wurde ein Züchtungsverfahren zur Herstellung strukturell hochqualitativer AlN-Volumenkristalle mittels PVT-Methode entwickelt. Wesentliche Grundvoraussetzungen dafür sind ein thermisch und chemisch stabiles Tiegelmaterial, ein AlN-Quellmaterial mit Sauerstoffverunreinigungen <300 ppm und AlN-Keime mit hoher kristalliner Perfektion. Unter den getesteten potenziellen Tiegelmaterialien (BN, TaC, TaN, NbC, NbN, TaB2, W) zeigten sich TaC und mit Abstrichen W unter AlN-Züchtungsbedingungen ausreichend stabil und wurden für die Wachstumsversuche verwendet. Zur effektiven Reduzierung der Sauerstoffverunreinigungen im AlN-Quellmaterial wurde ein karbothermischer Reduktionsprozess entwickelt, welcher eine Restsauerstoffkonzentration im Quellmaterial von <300 ppm gewährleistet. AlN-Keime für die Homoepitaxie von AlN-Volumenkristallen wurden durch heteroepitaktisches Wachstum auf SiC-Substraten und über spontane Nukleation freistehender AlN-Kristalle hergestellt. Beim heteroepitaktischen Wachstum auf SiC zeigte sich eine starke Abhängigkeit von der Substratpolarität. Wachstum auf C-polarem SiC ist mit geringeren Ätzgrubendichten von 5*10^4 - 10^6 cm^(-2) gegenüber Si-polarem Wachstum mit Ätzgrubensdichten von 5*10^6 - 10^7 cm^(-2) gekennzeichnet. Für beide Substratpolaritäten wurden Modelle des Anwachsstadiums entwickelt. AlN-Kristalle mit bis zu 35 mm im Durchmesser wurden gezüchtet. Die hohe Rissneigung aufgrund von Abkühlspannungen und Si-Konzentrationen von mehreren Prozent im gewachsenen AlN-Kristall vermindern aber die Kristallqualität erheblich. Eine sehr hohe kristalline Perfektion kann hingegen durch spontane Nukleation freistehender AlN-Kristalle auf einer Zwischenebene in der Tiegelmitte gewährleistet werden. Bei Nukleationstemperaturen von 2200 °C wurden isometrische Kristalle mit 12*12*14 mm^3 gezüchtet. Die Kristalle weisen eine zonare Struktur auf, welche durch einen in [000-1]-Richtung gewachsenen Kernbereich mit Versetzungsdichten <10^2 cm^(-2) und einem senkrecht um den Kernbereich gewachsenen Randbereich mit Versetzungsdichten von 10^2 - 10^4 cm^(-2) gekennzeichnet ist. Strukturell hochqualitative (000-1)-Keime wurden aus spontan nukleierten isometrisch gewachsenen AlN-Kristallen präpariert und für die homoepitaktische Volumenkristallzüchtung verwendet. Unter Zuhilfenahme numerischer Temperaturfeldsimulationen wurde ein angepasster Keimhalter entwickelt, welcher ein leicht konvexes Temperaturfeld am Keim gewährleistet und Parasitärwachstum unterdrückt. Somit konnten AlN-Volumenkristalle homoepitaktisch gezüchtet werden, welche eine Durchmesservergrößerung unter Beibehaltung der hohen strukturellen Qualität der Keimkristalle zeigen. Dieses Verfahren bietet die Grundlage, durch die Züchtung mehrerer Kristallgenerationen eine Durchmesseraufweitung auf industriell relevante Größen von 1-2" zu erreichen.
1. Erste Änderungssatzung zur fachspezifischen Prüfungs- und Studienordnung für den universitären Bachelor-Studiengang Elektrotechnik vom 23. Oktober 2020
(s. AMbl 21/2022)
2. Erste Änderungssatzung zur fachspezifischen Prüfungs- und Studienordnung für den universitären Master-Studiengang Elektrotechnik vom 23. Oktober2020
(ersetzt Abl. 14/2006, AMbl. 01/2014, AMbl. 09/2014)
Berichtigung der fachspezifischen Prüfungs- und Studienordnung für den Bachelor-Studiengang Soziale Arbeit vom 22. September 2020
Erste Änderungssatzung zur fachspezifischen Prüfungs- und Studienordnung für den Bachelor-Studiengang Soziale Arbeit vom 09. September 2021
Erste Änderungssatzung zur fachspezifischen Prüfungs- und Studienordnung für den Master-Studiengang Soziale Arbeit vom 09. September 2021