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Die Arbeit untersucht die laserbasierte Verschaltung und Strukturierung von Perowskit-Solarmodulen zur industriellen Herstellung und Aufskalierung. Ziel ist die Entwicklung effizienter Prozesse für leistungsstarke Solarmodule, darunter transparente und Tandem-PV für gebäudeintegrierte Anwendungen. Mit innovativen Lasertechniken wird ein Skalierungsfaktor von bis zu 500 bei minimalen Effizienzverlusten erreicht, was das Potenzial der Technologie für nachhaltige Energieversorgung unterstreicht.
This work explores laser-based interconnection and structuring of perovskite solar modules for industrial production and scaling. The goal is to develop efficient processes for high-performance modules, including transparent and tandem PV for building-integrated applications. Using innovative laser techniques, a scaling factor of up to 500 is achieved with minimal efficiency losses, highlighting the technology's potential for sustainable energy solutions.
Umfang: XV, 267 S.
Preis: 44.00 €
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The state of the art in the optical characterization of materials is advancing rapidly. New insights have been gained into the theoretical foundations of this research and exciting developments have been made in practice, driven by new applications and innovative sensor technologies that are constantly evolving. The great success of past conferences proves the necessity of a platform for presentation, discussion and evaluation of the latest research results in this interdisciplinary field.
Umfang: VIII, 328 S.
Preis: 42.00 €
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This book introduces and experimentally demonstrates a novel approach to exploit internal photoemission (IPE) for photodetection in silicon. The resulting device represents the first IPE-based detector that operates at technically viable performance figures. It combines a compact footprint and a high bandwidth with monolithic cointegration in silicon photonic circuits. The new concept opens an attractive route for optoelectronic generation and detection of waveforms in the sub-THz and THz range.
Umfang: XIV, 181 S.
Preis: 41.00 €
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Intraoperative Gamma Cameras are becoming increasingly common for radio-guided surgery. Coded Aperture Imaging has been proposed as a collimation technique, because it offers a better trade-off between sensitivity and spatial resolution, but requires image reconstruction. Therefore, a Convolutional Encoder-Decoder Network was developed and quantitatively compared with analytical methods. Furthermore, 3D-localization of point-like sources was investigated.
Umfang: XIV, 190 S.
Preis: 41.00 €
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The focus of this work is on human driving behavior in road traffic. Two aspects of it are covered, the prediction of it, including the identification of relevant influencing factors, as well as the behavior generation for autonomous vehicles.
The behavior prediction is based on a field study during which participants drove a measurement vehicle through inner-city traffic. Using the driven trajectories and lidar recordings complexity features to describe the surroundings at the intersection, the traffic there and the driving path are defined. The driving behavior is characterized by further features. Based on the complexity features regression models are trained to predict the behavior features. For that, linear regression, random forest and gradient boosting machine are utilized. Different complexity feature sets, including ones that are reduced with the help of an autoencoder, are used for prediction. The results show that the driving behavior can be predicted reliably. However, when using complexity feature sets with only few features the prediction performance is reduced.
In order to obtain a complexity score that is in line with human perception of complexity, an online study using videos of approaches to intersections was conducted. In pairwise comparisons participants were asked to identify the more complex situation. From that data complexity scores for the intersection passes included in the study are calculated. Several methods are used to assign these scores to the runs of the original field study. Behavior regression models are trained using these assigned complexity scores. The results show that behavior prediction with the complexity scores is possible, however, most variants require to also consider the turning direction as a second feature.
The behavior generation for decision-making at T-intersections is based on a discrete event system (DES). For it, several features are used to define events that describe the status of the decision-making process at the intersection. The events trigger the transitions between the states of the DES. All states are associated with either offensive or defensive driving behavior, which is implemented using the intelligent driver model. The algorithm is validated with a simulation framework. Using a generic map and several real maps, the decision-making model is simulated 14400 times while interacting with further cooperation vehicles. None of these runs resulted in a collision involving the vehicle running the algorithm and the times to pass the intersection can be explained by the numbers of cooperation vehicles and the intersection layouts. Further simulations are used to investigate the influence of limited visibility at the intersections on the model.
Umfang: XVII, 195 S.
Preis: 39.00 €
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Angesichts der Energiewende in Deutschland, stehen Netzbetreiber vor der Herausforderung eine zuverlässige Energieübertragung bereitzustellen. Der Einsatz supraleitender Kabel stellt hierbei eine Alternative für konventionelle Mittel- und Hochspannungstechnik dar. Daher werden in dieser Arbeit unterschiedliche hochtemperatursupraleitende Mehrleiterkonzepte für ein dreiphasiges Mittelspannungskabel untersucht. Ziel ist ein kompaktes Kabeldesign bei geringen elektrischen Verlusten.
Given the energy transistion in Germany, network operators face the challenge of providing reliable energy transmission. The use of superconducting cables represents an alternative for conventional medium- and high-voltage technology. Therefore, this work investigates various high-temperature superconducting multi-conductor concepts for a three-phase medium-voltage cable, aiming to achieve a compact cable design with low electrical losses.
Umfang: VIII, 192 S.
Preis: 50.00 €
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This work proposes a passivity-based framework for the decentralized stabilization of networked energy systems. Its key innovation are equilibrium-independent, passivity-based conditions for modularly inferring asymptotic stability. The framework allows for topology-independent, flexible system configurations in a plug-and-play fashion and extends to other control solutions and technologies, enabling holistic system and control approaches for networked multi-energy systems.
Umfang: VIII, 219 S.
Preis: 45.00 €
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Diese Arbeit beschäftigt sich mit der Nutzung von hochauflösenden Scheinwerfersystemen in Kombination mit Kamerasensoren als Sichtweitensensor bei Nebel.
Es werden unterschiedliche Konzepte vorgestellt und in einer Nebelkammer untersucht. Das Ergebnis sind auf die Fähigkeiten des Scheinwerfers angepasste Lichtfunktionen, über die mit unterschiedlichen Genauigkeiten Sichtweiten erfasst werden können. Es werden Eigenschaften abgeleitet, die für diese Funktion relevant sind.
In this work, the opportunities of high resolution headlamps are used in combination with camera sensors as a visibility meter in fog.
Different concepts are presented and investigated in a fog chamber. The results are on the capabilities of headlamps adjusted light functions, with which visibilities can be detected within different accuracies. Properties are derived that are relevant for this function.
Umfang: IX, 244 S.
Preis: 42.00 €
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Bildverarbeitung verknüpft das Fachgebiet die Sensorik von Kameras – bildgebender Sensorik – mit der Verarbeitung der Sensordaten – den Bildern. Daraus resultiert der besondere Reiz dieser Disziplin. Der vorliegende Tagungsband des „Forums Bildverarbeitung“, das am 21. und 22.11.2024 in Karlsruhe als Veranstaltung des Karlsruher Instituts für Technologie und des Fraunhofer-Instituts für Optronik, Systemtechnik und Bildauswertung stattfand, enthält die Aufsätze der eingegangenen Beiträge.
Image processing combines the disciplines of cameras – image-based sensors – with the processing of the sensor data – the images. From this follows the particular attraction of this field. The conference proceedings at hand of the “Image Processing Forum”, which took place on 21.-22.11.2024 in Karlsruhe as a common event of the Karlsruhe Institute of Technology and the Fraunhofer Institute of Optronics, System Technologies and Image Exploitation, contain the articles of the contributions.
Umfang: VII, 232 S.
Preis: 45.00 €
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Magnetic confinement fusion relies on plasma heating and plasma control using gyrotron oscillators providing at megawatt power levels. The operational reliability decreases when operating at the performance limits due to increasing parasitic mode activity. This work demonstrates for the first time the automated, fast recovery of nominal gyrotron operation during a pulse by exploiting the hysteretic gyrotron behaviour after a mode switch being in use at the Wendelstein 7-X ECRH facility.
Umfang: XVII, 237 S.
Preis: 47.00 €
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