@inproceedings{GaidaWolfStuhlsatzetal.2011, author = {Gaida, Daniel and Wolf, Christian and Stuhlsatz, Andr{\´e} and Lippel, Jens and B{\"a}ck, T. and Bongards, Michael and McLoone, S.}, title = {State Estimation for Anaerobic Digesters using the ADM1}, series = {Proceedings of International IWA-Symposium on Anaerobic Digestion of Solid Waste and Energy Crops, Vienna, Austria, 2011}, booktitle = {Proceedings of International IWA-Symposium on Anaerobic Digestion of Solid Waste and Energy Crops, Vienna, Austria, 2011}, year = {2011}, language = {en} } @inproceedings{StuhlsatzMeyerEybenetal.2011, author = {Stuhlsatz, Andr{\´e} and Meyer, Christine and Eyben, Florian and Zielke, Thomas and Meier, Gunter and Schuller, Bjorn}, title = {Deep neural networks for acoustic emotion recognition: Raising the benchmarks}, series = {2011 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)}, booktitle = {2011 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)}, publisher = {IEEE}, doi = {10.1109/ICASSP.2011.5947651}, pages = {5688 -- 5691}, year = {2011}, abstract = {Deep Neural Networks (DNNs) denote multilayer artificial neural networks with more than one hidden layer and millions of free parameters. We propose a Generalized Discriminant Analysis (GerDA) based on DNNs to learn discriminative features of low dimension optimized with respect to a fast classification from a large set of acoustic features for emotion recognition. On nine frequently used emotional speech corpora, we compare the performance of GerDA features and their subsequent linear classification with previously reported benchmarks obtained using the same set of acoustic features classified by Support Vector Machines (SVMs). Our results impressively show that low-dimensional GerDA features capture hidden information from the acoustic features leading to a significantly raised unweighted average recall and considerably raised weighted average recall.}, language = {en} } @article{HeninPetitRohwetteretal.2011, author = {Henin, Stefano and Petit, Yannick and Rohwetter, Philipp and Stelmaszczyk, Kamil and Hao, Zuoqiang and Nakaema, Walter Morinobu and Vogel, Andreas and Pohl, Tobias and Schneider, Friedhelm and Kasparian, J{\´e}r{\^o}me and Weber, Konradin and W{\"o}ste, Ludger and Wolf, Jean-Pierre}, title = {Field measurements suggest the mechanism of laser-assisted water condensation}, series = {Nature Communications}, volume = {2}, journal = {Nature Communications}, number = {1}, publisher = {Springer Nature}, issn = {2041-1723}, doi = {10.1038/ncomms1462}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-52439}, year = {2011}, abstract = {Because of the potential impact on agriculture and other key human activities, efforts have been dedicated to the local control of precipitation. The most common approach consists of dispersing small particles of dry ice, silver iodide, or other salts in the atmosphere. Here we show, using field experiments conducted under various atmospheric conditions, that laser filaments can induce water condensation and fast droplet growth up to several μm in diameter in the atmosphere as soon as the relative humidity exceeds 70\%. We propose that this effect relies mainly on photochemical formation of p.p.m.-range concentrations of hygroscopic Hno3, allowing efficient binary Hno3-H2o condensation in the laser filaments. Thermodynamic, as well as kinetic, numerical modelling based on this scenario semiquantitatively reproduces the experimental results, suggesting that particle stabilization by Hno3 has a substantial role in the laser-induced condensation.}, subject = {Kondensation}, language = {en} } @inproceedings{VogelWeberFischeretal.2011, author = {Vogel, Andreas and Weber, Konradin and Fischer, Christian and van Haren, G{\"u}nther and Pohl, Tobias and Grobety, Bernhard and Meier, Mario}, title = {Airborne in-situ measurements of the Eyjafjalloj{\"o}kull ash plume with a small aircraft and optical particle spectrometers over north-western Germany - comparison between the aircraft measurements and the VAAC-model calculations}, series = {Geophysical Research Abstracts: EGU General Assembly 2011}, volume = {13}, booktitle = {Geophysical Research Abstracts: EGU General Assembly 2011}, publisher = {Copernicus}, address = {G{\"o}ttingen}, year = {2011}, abstract = {The eruption of the volcano Eyjafjallaj{\"o}kull (Iceland) in 2010 has caused a transportation of an ash dust plume over large areas of Europe. In April 2010 many airports in Europe were closed for several days because of the volcano ash plume and even in May 2010 several German and European airports were closed for shorter periods because of the danger caused by the volcanic ash dust. The VAAC (Volcanic Ash Advisory Center), London, has continuously published graphics of the predicted spread and dispersion of the volcanic ash plume, which were partly basis for the air traffic restrictions in Germany. In this situation the Laboratory for Environmental Measurement Techniques of the University of Applied Sciences in Duesseldorf has performed 14 measurement flights starting from April 23 2010 to May 21 2010 to get real airborne in-situ dust measurement data over the north-western part of Germany and for comparison with the predicted ash dispersion model data of the VAAC of London in Germany. Moreover, airborne passive DOAS remote sensing measurements have been performed by a mini-DOAS system for SO2-measurements within the plume. In this paper the results of the airborne optical ash particle measurements as well as the remote sensing SO2 measurements will be reported for situations with and without the volcanic plume over northern Germany in detail. Moreover, the measured dust data will be compared with the model dispersion predictions for the ash plume by the VAAC and with European limit concentrations. Main conclusions are: The „ash plume", found by the aircraft measurement of the Duesseldorf University of Applied Sciences over north western Germany in the "red zone" predicted by the VAAC turned out to be inhomogeneous during the measurement flights Clusters of ash plume sometimes had only a height extension of several hundred meters or less Ash substructures with a horizontal extension of ten kilometres up to several tenth of kilometres could be found Vertical double structures of ash plume could be measured by spiral flights and could be observed visually in horizontal direction Ash plume could be observed visually as small brown layer in horizontal direction Particles collected during flight could be identified as ash particles by electron microscope analysis and chemical analysis}, subject = {Vulkanasche}, language = {en} } @article{PetitHeninKasparianetal.2011, author = {Petit, Y. and Henin, S. and Kasparian, J. and Wolf, J. P. and Rohwetter, P. and Stelmaszczyk, K. and Hao, Z. Q. and Nakaema, W. M. and W{\"o}ste, L. and Vogel, A. and Pohl, T. and Weber, Konradin}, title = {Influence of pulse duration, energy, and focusing on laser-assisted water condensation}, series = {Applied Physics Letters}, volume = {98}, journal = {Applied Physics Letters}, number = {4}, publisher = {AIP Publishing}, issn = {0003-6951}, doi = {10.1063/1.3546172}, year = {2011}, abstract = {We investigate the influence of laser parameters on laser-assisted water condensation in the atmosphere. Pulse energy is the most critical parameter. Nanoparticle generation depends linearly on energy beyond the filamentation threshold. Shorter pulses are more efficient than longer ones with saturation at ∼1.5 ps. Multifilamenting beams appear more efficient than strongly focused ones in triggering the condensation and growth of submicronic particles, while polarization has a negligible influence on the process. The data suggest that the initiation of laser-assisted condensation relies on the photodissociation of the air molecules rather than on their photoionization.}, language = {en} } @misc{AdamLohmann2011, author = {Adam, Mario and Lohmann, Sandra}, title = {Solare K{\"u}hlung - Dynamische Rechnersimulationen und Parametervariationen}, series = {KI K{\"a}lte - Luft - Klimatechnik}, volume = {47}, journal = {KI K{\"a}lte - Luft - Klimatechnik}, number = {5}, publisher = {H{\"u}thig}, organization = {H}, issn = {1865-5432}, pages = {22 -- 26}, year = {2011}, language = {de} } @inproceedings{AdamDreherSchrammetal.2011, author = {Adam, Mario and Dreher, Martina and Schramm, Sebastian and Anthrakidis, Anette and Faber, Christian and Lanz, Marco}, title = {Solare-Prozessw{\"a}rmeStandards. Poster Session}, series = {World Sustainable Energy Days 2011, 2.-4. M{\"a}rz, Wels}, booktitle = {World Sustainable Energy Days 2011, 2.-4. M{\"a}rz, Wels}, address = {Wels}, year = {2011}, language = {de} } @inproceedings{FaberAnthrakidisLanzetal.2011, author = {Faber, Christian and Anthrakidis, Anette and Lanz, Marco and Rusack, Markus and Weis, Fabian and Adam, Mario and Schramm, Sebastian}, title = {Barriers to solar process heat applications,}, series = {SWC 2011: ISES Solar World Congress, 28 August - 2 September 2011, Kassel, Germany}, booktitle = {SWC 2011: ISES Solar World Congress, 28 August - 2 September 2011, Kassel, Germany}, address = {Kassel}, pages = {1326 -- 1334}, year = {2011}, language = {en} } @inproceedings{BackesAdamGottschaldetal.2011, author = {Backes, Klaus and Adam, Mario and Gottschald, Jonas and Faber, Christian and Henneb{\"o}hl, Fred. and Lanz, Marco and Anthrakidis, Anette}, title = {KWKK-Anlagen im Feldtest: Verbesserung ihrer Regelung und Hydraulik}, series = {Deutsche K{\"a}lte-Klima-Tagung 2011, 16.-18.11.2011, Aachen}, booktitle = {Deutsche K{\"a}lte-Klima-Tagung 2011, 16.-18.11.2011, Aachen}, address = {Aachen}, organization = {Deutscher K{\"a}lte- und Klimatechnischer Verein}, year = {2011}, language = {de} } @article{EliassonPalssonWeber2011, author = {El{\´i}asson, J{\´o}nas and Palsson, Asgeir and Weber, Konradin}, title = {Monitoring ash clouds for aviation}, series = {Nature}, volume = {475}, journal = {Nature}, number = {7357}, publisher = {Springer Nature}, doi = {10.1038/475455b}, pages = {455}, year = {2011}, language = {en} }