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Environmental noise leads to dephasing and relaxation in a quantum system. Often, a rigorous treatment of multiple noise sources within a system-bath approach is not possible. We discuss the influence of environmental fluctuations on a quantum system whose dynamics is dephasing already due to a phenomenologically treated additional noise source. For this situation, we develop a path-integral approach, which allows us to treat the system-environment coupling in a numerically exact way, and additionally we extend standard perturbative approaches. We observe strong deviations between the numerically exact and the perturbative results even for weak system-bath coupling. This shows that standard perturbative approaches fail for additional, even weak, system-bath couplings if the system dynamics is already dissipative.
Cyber Security – 10 aktuelle Problemfelder. Problembewusstsein muss zunächst entwickelt werden!
(2017)
This work deals with the preparation and investigation of polymer electrolyte membrane fuel cell (PEMFC) electrodes, which are obtained using gas diffusion layers coated with graphene related material (GRM) serving as a catalyst support for platinum nanoparticles. PEMFC electrocatalysts have been prepared by pulsed electrochemical deposition of platinum particles from hexachloroplatinic acid. Prior to GRM decoration with platinum, the graphene structures are functionalized by oxygen plasma treatment. This leads to oxygen containing functional groups on the GRM outer surface, providing an improved hydrophilic behavior, thus favoring the Pt deposition process. Membrane electrode assemblies (MEAs) with the so prepared electrodes are investigated in-situ in our fuel cell test system. Polarization plots (in-situ cell performance) using these MEAs have been tested under different operational conditions.
Upgrade of Bioreactor System Providing Physiological Stimuli
to Engineered Musculoskeletal Tissues
(2017)
A novel central control interface (CCI) is developed to improve the modular bioreactor system with regard to extendability and modifiability in Tissue Engineering (TE) applications. This paper presents the results developed in the project with open-source hardware and the graphical programming system LabVIEW. A new platform independent User Interface was further developed to contribute to the new flexibility of the device.
Die kognitive Distanzierung von Arbeitsinhalten wahrend der arbeitsfreien Zeit (psychological detachment) stellt einen wichtigen Faktor für Erholung, Wohlbefinden und andauernde
Leistungsfähigkeit von Beschäftigten dar. Die Antezedenzien von mentalem Abschalten nach der Arbeit sind jedoch bisweilen nur unzureichend untersucht worden; dies gilt insbesondere für Variablen im unmittelbaren Arbeitsumfeld von Mitarbeitern. Was können Organisationen tun, um das mentale Abschalten ihrer Mitarbeiter in der Freizeit zu fordern? Basierend auf einer Kombination aus dem Stressor–Detachment Model und der Theorie der Ressourcenerhaltung gehen wir davon aus, dass Servant Leadership als Prädiktor von mentalem Abschalten nach der Arbeit betrachtet werden kann, welches sich wiederum positiv auf freiwilliges Arbeitsengagement (Organizational Citizenship Behavior), auswirkt. Die Hypothesen testen wir mittels Querschnittsdesign mit N = 121 Mitarbeitern eines Technologiekonzerns. Es werden Zeitintervalle zwischen den Erhebungszeitpunkten sowie Fremdbeurteilungen eingesetzt, um das Risiko von Methodenverzerrung zu minimieren. Die Ergebnisse eines Strukturgleichungsmodells zeigen hypothesenkonform, dass mentales Abschalten nach der Arbeit den Zusammenhang zwischen Servant Leadership und freiwilligem Arbeitsengagement teilweise mediiert. Implikationen für die Praxis und Ansatzpunkte für zukünftige Forschungsarbeiten werden diskutiert.
This paper presents a novel approach to build consistent 3D maps for multi robot cooperation in USAR environments. The sensor streams from unmanned aerial vehicles (UAVs) and ground robots (UGV) are fused in one consistent map. The UAV camera data are used to generate 3D point clouds that are fused with the 3D point clouds generated by a rolling 2D laser scanner at the UGV. The registration method is based on the matching of corresponding planar segments that are extracted from the point clouds. Based on the registration, an approach for a globally optimized localization is presented. Apart from the structural information of the point clouds, it is important to mention that no further information is required for the localization. Two examples show the performance of the overall registration.
Improved Plasma Membrane Models as Test Systems for the Membrane
Disrupting Activity of Kalata B1
(2017)
Medienforschung
(2017)
Fluggastrechte-Verordnung
(2017)
Staatsorganisationsrecht
(2017)
Bayern baden billiger!?
(2017)
Der Fall des Monsieur B.
(2017)
Performance enhancing study for large scale PEM electrolyzer cells based on hydraulic compression
(2017)
In this experimental work we present a novel electrolyzer system for the production of hydrogen and oxygen at high pressure levels without an additional mechanical compressor. Due to its control strategies, the operation conditions for this electrolyzer can be kept optimal for each load situation of the system. Furthermore, the novel system design allows for dynamic long-term operation as well as for easy maintainability. Therefore, the device meets the requirements for prospective power-to-gas applications, especially, in order to store excess energy from renewable sources. A laboratory scale device has been developed and high-pressure operation was validated. We also studied the long-term stability of the system by applying dynamic load cycles with load changes every 30 sec. After 80 h of operation the used membrane electrode assembly (MEA) was investigated by means of SEM, EDX and XRD analysis.
The technology of polymer electrolyte membrane (PEM) electrolysis provides an efficient way to produce hydrogen. In combination with renewable energy sources, it promises to be one of the key factors towards a carbon-free energy infrastructure in the future. Today, PEM electrolyzers with a power consumption higher than 1 MW and a gas output pressure of 30 bar (or even higher) are already commercially available. Nevertheless, fundamental research and development for an improved efficiency is far from being finally accomplished, and mostly takes place on a laboratory scale. Upscaling the laboratory prototypes to an industrial size usually cannot be achieved without facing further problems and/or losing efficiency. With our novel system design based on hydraulic cell compression, a lot of the commonly occurring problems like inhomogeneous temperature and current distribution can be avoided. In this study we present first results of an upscaling by a factor of 30 in active cell area.