@article{63675, abstract = {{Cobalt spinel (Co3O4) catalysts are widely studied in scope of the electrocatalytic oxygen evolution reaction (OER), yet the role of interfacial structural transformation under anodic bias remains under debate. Here, we employ an operando approach, combining a fast electrochemical quartz crystal microbalance with dissipation monitoring (EQCM-D), electrochemical impedance spectroscopy (EIS), and Raman spectroscopy to investigate interfacial transformations of Co3O4 nanoparticle electrodes in alkaline electrolyte. We identify two distinct regimes during the anodic sweep prior to the macroscopic OER onset. At lower potentials, the catalyst interface remains mechanically rigid while reversibly associating several OH−/H2O species per oxidized cobalt site. At higher potentials, pronounced softening of the interface occurs alongside further uptake of electrolyte species. This indicates amorphization and a ‘swelling process’ beyond simple adsorption. Notably, an electrochemical conditioning treatment can suppress mass and compliance hysteresis without affecting OER activity, suggesting that most incorporated electrolyte species do not participate in the OER. EIS further reveals that OER intermediates form well below the apparent OER onset potential. These results advance our mechanistic understanding of interfacial transformations in cobalt-based OER catalysts and establish EQCM-D as a sensitive operando technique for probing electrocatalyst transformations.}}, author = {{Leppin, Christian and Placke‐Yan, Carsten and Bendt, Georg and Hernandez, Sheila and Tschulik, Kristina and Schulz, Stephan and Linnemann, Julia}}, issn = {{1867-3880}}, journal = {{ChemCatChem}}, keywords = {{electrocatalysis, Co3O4, EQCM-D, OER}}, number = {{2}}, publisher = {{Wiley}}, title = {{{Interfacial Softening and Electrolyte Uptake in Co3O4 OER Catalysts: Insight from Operando Spectroscopy and Fast EQCM‐D}}}, doi = {{10.1002/cctc.202501104}}, volume = {{18}}, year = {{2026}}, } @inbook{55646, abstract = {{Was bedeutet es, „für“ Robben, Wale oder bedrohte marine Ökosysteme zu sprechen? Diese Frage steht im Zentrum aktueller Debatten um die Rechte der Natur – und sie stellt zugleich eine besondere Herausforderung für die ästhetische Praxis im Anthropozän dar. Der Aufsatz untersucht, welchen spezifischen Beitrag Environmental Sound Art zu gegenwärtigen umweltpolitischen Debatten leisten kann, und nutzt dafür feministische und postkoloniale Theorieansätze als analytisches Werkzeug. Im Zentrum steht dabei die Frage nach der Repräsentationsdynamik zwischen Komponist*in und nichtmenschlichen Subjekten sowie das daraus resultierende Problem der Anwaltschaft. Am Beispiel von Jana Winderens Soundscape-Komposition "Spring Bloom in the Marginal Ice Zone" (2017) diskutiert der Aufsatz die Rolle der Komponistin als Anwältin für ein Ökosystem und dessen Bewohner*innen sowie die Grenzen und Möglichkeiten ästhetischer Positionen, nichtmenschlichen Entitäten ›eine Stimme zu verleihen‹. Der Text unterzieht dabei Gayatri Chakravorty Spivaks Überlegungen zur Repräsentation Subalterner einer Relektüre unter posthumanistischen Vorzeichen und entwickelt daraus abschließend das Konzept des ›subversiven Zuhörens‹, eine kritische Hörpraxis, die anthropozentrische Wahrnehmungsmuster hinterfragt und dem nachspürt, was durch sie unhörbar gemacht wird. }}, author = {{Spieker, Jonas}}, booktitle = {{Non*binär! Sound und Gender im Posthumanismus}}, editor = {{Bartsch, Cornelia and Schürmer, Anna and Spieker, Jonas}}, issn = {{978-3-487-17174-6}}, keywords = {{Environmental Sound Art, Ecological Sound Art, Blue Humanities, Posthumanism, Critical Posthumanism, Environmental Humanities, Soundscape Studies, Ecocriticism, Listening (Music), Ecomusicology, Sound Art, Environmental sounds, Advocacy and Activism, Gayatri Spivak}}, pages = {{113–126}}, publisher = {{Georg Olms Verlag}}, title = {{{Klagende Robben. Environmental Sound Art und das Problem der Anwaltschaft}}}, doi = {{https://doi.org/10.5771/9783487171746-113}}, volume = {{17}}, year = {{2025}}, } @inproceedings{22218, author = {{Krauter, Stefan and Böcker, Joachim and Freitag, Christine and Hehenkamp, Burkhard and Hilleringmann, Ulrich and Temmen, Katrin and Klaus, Tobias and Rohrer, Nicolaus and Lehmann, Sven}}, booktitle = {{Tagungsband des 36. PV-Symposiums, 18.-26 Mai 2021}}, isbn = {{978-3-948176-14-3}}, keywords = {{Art-D, Afrika, Resilienz, Resilience, Grid stability, robustness, microgrids}}, location = {{Staffelstein / online}}, pages = {{305--309}}, publisher = {{Conexio}}, title = {{{Projekt Art-D Grids: Nachhaltige und stabile Microgrids in Afrika - eine Plattform für Forschung und Lehre für die Entwicklung}}}, year = {{2021}}, } @inproceedings{24540, abstract = {{With its growing population and industrialization, DREs, and solar technologies in particular, provide a sustainable means of bridging the current energy deficit in Africa, increasing supply reliability and meeting future demand. Data acquisition and data management systems allow real time monitoring and control of energy systems as well as performance analysis. However commercial data acquisition systems often have cost implications that are prohibitive for small PV systems and installations in developing countries. In this paper, a multi-user, multi-purpose microgrid database system is designed and implemented. MAVOWATT 270 power quality analyzers by GOSSEN METRAWATT, raspberry pi modules and sensors are used for measuring, recording and storing electrical and meteorological data in East Africa. Socio-economic data is also stored in the database. The designed system employs open source software and hardware solutions which are best suited to developing regions like East Africa due to the lower cost implications. The expected results promise a comprehensive database covering different electro-technical and socio-economic parameters useful for optimal design of microgrid systems.}}, author = {{Kakande, Josephine Nakato and Philipo, Godiana Hagile and Krauter, Stefan}}, booktitle = {{Proceedings of the 38th European Photovoltaic Solar Energy Conference and Exhibition (EUPVSEC 2021)}}, isbn = {{3-936338-78-7}}, keywords = {{Art-D, Afrika, Demand side management, MySQL, Raspberry pi, Data acquisition}}, pages = {{1505--1510}}, title = {{{Load Data Acquisition in Rural East Africa for the Layout of Microgrids and Demand–Side–Management Measures}}}, doi = {{10.4229/EUPVSEC20212021-6BV.5.38}}, year = {{2021}}, } @inproceedings{11917, abstract = {{In this paper we present a speech presence probability (SPP) estimation algorithmwhich exploits both temporal and spectral correlations of speech. To this end, the SPP estimation is formulated as the posterior probability estimation of the states of a two-dimensional (2D) Hidden Markov Model (HMM). We derive an iterative algorithm to decode the 2D-HMM which is based on the turbo principle. The experimental results show that indeed the SPP estimates improve from iteration to iteration, and further clearly outperform another state-of-the-art SPP estimation algorithm.}}, author = {{Vu, Dang Hai Tran and Haeb-Umbach, Reinhold}}, booktitle = {{38th International Conference on Acoustics, Speech and Signal Processing (ICASSP 2013)}}, issn = {{1520-6149}}, keywords = {{correlation methods, estimation theory, hidden Markov models, iterative methods, probability, spectral analysis, speech processing, 2D HMM, SPP estimates, iterative algorithm, posterior probability estimation, spectral correlation, speech presence probability estimation, state-of-the-art SPP estimation algorithm, temporal correlation, turbo principle, two-dimensional hidden Markov model, Correlation, Decoding, Estimation, Iterative decoding, Noise, Speech, Vectors}}, pages = {{863--867}}, title = {{{Using the turbo principle for exploiting temporal and spectral correlations in speech presence probability estimation}}}, doi = {{10.1109/ICASSP.2013.6637771}}, year = {{2013}}, }