Technische Universität Berlin

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Recent Submissions
Die Rolle der nicht-hoheitlichen Flächensicherung im Naturschutz

Disselhoff, Tilmann (2018)

The control of land uses for nature conservation purposes is implemented through regulatory instruments (land use planning, designation of reserves etc.) and through voluntary contractual agreements. The pursuit of conservation goals through voluntary instruments (acquisition of properties, voluntary use restrictions etc.) can be summarized as private land conservation. Private land conservati...

Grundlagen und Anwendbarkeit von Magneto-Adaptronischen Transducern (MATs) an ferromagnetischen Materialien zur aktiven Schall- und Schwingungsminderung

Glugla, Markus (2018)

Die magnetischen Eigenschaften von ferromagnetischen Materialien zeigen zwei Effekte, den Joule- und den Villari-Effekt. Der Joule-Effekt, auch bekannt als magnetostriktiver Effekt, beschreibt die Längen- und Volumenänderung eines ferromagnetischen Materials unter Einwirkung eines magnetischen Felds. Der inverse Vorgang, die Änderung des Magnetfelds eines ferromagnetischen Materials unter Einwi...

Low dimensional visualization and modelling of data using distance-based models

Gruenhage, Gina (2018)

This thesis consists of two parts, which seek low-dimensional representations for visualization and analysis of data. Both parts use rather different types of models and inference methods. In both cases, however, the models show inherent invariances, which need to be coped with during the optimization procedures. The first part addresses a fundamental problem in machine learning, namely, the ch...

IR-spektroskopische Charakterisierung von organisch-funktionalisierten Monolagen und Immobilisierung von Peptiden auf Silizium Oberflächen

Borowski, Anne (2018)

Das Interesse an der Entwicklung und Forschung von Biosensoren hat sich in den letzten Jahren stetig gesteigert. Die Verwendung von optischen, auf SOI (silicon-on-isulator) basierenden Sensoren, bietet die Möglichkeit Protein-Ligand-Wechselwirkungen auf ihre thermodynamischen und kinetischen Eigenschaften zu untersuchen. Das Konzept von selbstassemblierten Monoschichten (SAMs) mit definierten o...

Mobile multi-parameter measurements for the dynamic analysis of gradients in brewing vessels

Bockisch, Anika (2018)

Industrial processes have to be competitive and thus efficient. Products have to be produced with a high reproducibility and quality. At the same time, the scale of these processes reaches up to several 100 m³ and was even increasing in recent years. This is challenging since the power input is limited in large-scale processes. Therefore, mixing times are increasing in parallel to the volume, w...

Entwicklung eines Frühwarnsystems zur Steigerung der Raum-Zeit-Ausbeute einstufiger NawaRo-Biogasanlagen durch Additivzugabe

Schröder, Patrick (2018)

Zur Steigerung der Raum-Zeit-Ausbeute in einstufigen, landwirtschaftlichen Biogasanlagen wurden Versuche zur Entwicklung von Frühwarnindikatoren (FWI) für Prozessstörungen und von Maßnahmen zur Prozessstabilisierung, sowie zur Substratzusammensetzung durchgeführt. Ein neuer FWI wurde entwickelt, der A/elCon, das Verhältnis aus der Konzentration organischer Säuren (engl.: org. acids) zur elektr...

Well-ordered iron oxide and sulfide thin films

Davis, Earl Matthew (2018)

In this thesis, the growth of iron oxide and iron sulfide thin films has been investigated. These are materials that are abundantly found in the earth's crust and have long been studied by humanity, having a wide range of properties that have seen their use in many applications. Among these applications, iron oxides have played an important role in catalytic processes such as the Haber-Bosch p...

The characterization of water-soluble organic compounds released from organic-rich sediments

Calzada Mendoza, Jacqueline Mireya (2018)

The study of deep biosphere, especially the growth under extreme conditions (e.g. high temperatures and limited substrates), has attracted considerable attention in recent decades. Even under such conditions, water and low molecular weight organic acids (LMWOA) are present. LMWOA play an important role in several biotic and abiotic processes, e.g. in the Krebs cycle used by all aerobic organism...

Towards the colonization of Mars by in-situ resource utilization: Slip cast ceramics from Martian soil simulant

Karl, David ; Kamutzki, Franz ; Zocca, Andrea ; Görke, Oliver ; Günster, Jens ; Gurlo, Aleksander (2018-10-11)

Here we demonstrate that by applying exclusively Martian resources a processing route involving suspensions of mineral particles called slurries or slips can be established for manufacturing ceramics on Mars. We developed water-based slurries without the use of additives that had a 51 wt. % solid load resembling commercial porcelain slurries in respect to the particle size distribution and rheo...

A systematic review of randomized controlled trials of mHealth interventions against non-communicable diseases in developing countries

Stephani, Victor ; Opoku, Daniel ; Quentin, Wilm (2016-07-15)

Background The reasons of deaths in developing countries are shifting from communicable diseases towards non-communicable diseases (NCDs). At the same time the number of health care interventions using mobile phones (mHealth interventions) is growing rapidly. We review studies assessing the health-related impacts of mHealth on NCDs in low- and middle-income countries (LAMICs). Methods A syst...

Selective enrollment in Disease Management Programs for coronary heart disease in Germany – An analysis based on cross-sectional survey and administrative claims data

Röttger, Julia ; Blümel, Miriam ; Busse, Reinhard (2017-04-04)

Background In 2002, Disease Management Programs (DMPs) were introduced within the German healthcare system with the aim to increase the quality of chronic disease care. Due to the enrollment procedures, it can be assumed a) that only certain patients actively decide to enroll in a DMP and/or b) that only certain patients get the recommendation for DMP enrollment from their physician. How stron...

Finite-Size Effects on Traveling Wave Solutions to Neural Field Equations

Lang, Eva ; Stannat, Wilhelm (2017-07-06)

Neural field equations are used to describe the spatio-temporal evolution of the activity in a network of synaptically coupled populations of neurons in the continuum limit. Their heuristic derivation involves two approximation steps. Under the assumption that each population in the network is large, the activity is described in terms of a population average. The discrete network is then approx...

The inverse perovskite BaLiF3: single-crystal neutron diffraction and analyses of potential ion pathways

Wiedemann, Dennis ; Meutzner, Falk ; Fabelo, Oscar ; Ganschow, Steffen (2018)

Doped barium lithium trifluoride has attracted attention as component for scintillators, luminescent materials and electrodes. With lithium and fluoride, it contains two possibly mobile species, which may account for its ionic conductivity. In this study, neutron diffraction on oxide-containing BaLiF3 single-crystals is performed at up to 636.2°C. Unfortunately, ion-migration pathways could not...

Policy Evaluation in Multiagent Transport Simulations

Grether, Dominik ; Kickhöfer, Benjamin ; Nagel, Kai (2010)

In democratically organized societies, the implementation of measures with regressive effects on welfare distribution tends to be complicated because of low public acceptance. The microscopic multiagent simulation approach presented in this paper can help to design better solutions in such situations. Income can be included in utility calculations for a better understanding of problems linked t...

Adding Mode Choice to Multiagent Transport Simulation

Rieser, Marcel ; Grether, Dominik ; Nagel, Kai (2009)

It had been shown previously that so-called agent-based traffic micro-simulations could be used for dynamic traffic assignment, that is, iterative route adjustment, until either a Nash equilibrium or some steady state distribution between alternatives had been found. It was also shown that the same approach could be extended to (departure) time adjustment; that is, time adjustment and route adj...

Agent-Oriented Coupling of Activity-Based Demand Generation with Multiagent Traffic Simulation

Rieser, Marcel ; Nagel, Kai ; Beuck, Ulrike ; Balmer, Michael ; Rümenapp, Jens (2007)

The typical method to couple activity-based demand generation (ABDG) and dynamic traffic assignment (DTA) is time-dependent origin-destination (O-D) matrices. With that coupling method, the individual traveler's information gets lost. Delays at one trip do not affect later trips. However, it is possible to retain the full agent information from the ABDG by writing out all agents' plans, instead...

Agent-Based Demand-Modeling Framework for Large-Scale Microsimulations

Balmer, Michael ; Axhausen, Kay W. ; Nagel, Kai (2006)

Microsimulation is becoming increasingly important in traffic demand modeling. The major advantage over traditional four-step models is the ability to simulate each traveler individually. Decision-making processes can be included for each individual. Traffic demand is the result of the different decisions made by individuals; these decisions lead to plans that the individuals then try to optimi...

Modeling Location Choice of Secondary Activities with a Social Network of Cooperative Agents

Marchal, Fabrice ; Nagel, Kai (2005)

Activity-based models in transportation science focus on the description of human trips and activities. Modeling the spatial decision for so-called secondary activities is addressed in this paper. Given both home and work locations, where do individuals perform activities such as shopping and leisure? Simulation of these decisions using random utility models requires a full enumeration of possi...

Robustness of Efficient Passenger Boarding Strategies for Airplanes

Ferrari, Pieric ; Nagel, Kai (2005)

Common wisdom is that airplanes make money only when they are in the air. Therefore, turnaround time (turn time) on the ground should be reduced as much as possible. An important contribution to the turn time is airplane boarding time. Many different schemes are in use, from random seat selection to sophisticated boarding groups. A simulation model is described to evaluate different boarding st...

Integrating CEMDAP and MATSIM to Increase the Transferability of Transport Demand Models

Ziemke, Dominik ; Nagel, Kai ; Bhat, Chandra (2015)

An activity-based approach to transport demand modeling is considered the most behaviorally sound procedure to assess the effects of transport policies. This paper investigates whether it is possible to transfer an estimated model for activity generation from elsewhere (the estimation context) and use local area (application context) traffic counts to develop a local area activity-based transpo...