11. Effects of Ice Nucleation Protein Repeat Number and Oligomerization Level on Ice Nucleation ActivityMeilee Ling, Heike Wex, Sarah Grawe, Jonas Jakobsson, Jakob Löndahl, Susan Hartmann, Kai Finster, Thomas Boesen, Tina Šantl Temkiv, 2018, original scientific article Keywords: biological ice nucleation, ice-nucleating proteins, ice-nucleation active bacteria Published in RUNG: 04.01.2021; Views: 2841; Downloads: 65 Full text (943,44 KB) |
12. Performance of microAethalometers: Real-world Field Intercomparisons from Multiple Mobile Measurement Campaigns in Different Atmospheric EnvironmentsHoney Alas, Thomas Mueller, Kay Weinhold, Sascha Pfeifer, Kristina Glojek, Asta Gregorič, Griša Močnik, Luka Drinovec, Francesca Costabile, Martina Ristorini, A. Wiedensohler, 2020, original scientific article Abstract: Small aethalometers are frequently used to measure equivalent black carbon (eBC) mass concentrations in the context of personal exposure and air pollution mapping through mobile measurements (MM). The most widely used is the microAethalometer (AE51). Its performance in the laboratory and field is well documented, however, there is not sufficient data in the context of its performance in different environments. In this investigation, we present the characterization of the performance of the AE51 through field unit-to-unit intercomparisons (IC), and against a reference absorption photometer from three MM campaigns conducted in drastically different environments. Five IC parameters were considered: i) study area, ii) location of IC, iii) time of day, iv) duration of IC, and v) correction for the filter-loading effect. We can conclude that it is crucial where and how long the IC have been performed in terms of the correlation between the mobile and reference instruments. Better correlations (R2 > 0.8, slope = 0.8) are achieved for IC performed in rural, and background areas for more than 10 minutes. In locations with more homogenous atmosphere, the correction of the loading effect improved the correlation between the mobile and reference instruments. In addition, a newer microAethalometer model (MA200) was characterized in the field under extreme cold conditions and correlated against another MA200 (R2 > 0.8, slope ≈ 1.0), AE51(R2 > 0.9, slope ≈ 0.9), and a stationary Aethalometer (AE33) across all wavelengths (R2 > 0.8, slope ≈ 0.7). For MA200, the loading effect was more pronounced, especially at the lower wavelengths, hence the correction of the loading effect is essential to improve the correlation against the AE33. The MA200 and AE51 proved to be robust and dependable portable instruments for MM applications. Real-world quality assurance of these instruments should be performed through field IC against reference instruments with longer durations in areas of slowly changing eBC concentration. Keywords: Portable instruments, Mobile monitoring, Black carbon, Instrument intercomparisons Published in RUNG: 15.09.2020; Views: 3195; Downloads: 188 Full text (3,54 MB) |
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14. Elucidation of Donor:Acceptor Phase Separation in Nonfullerene Organic Solar Cells and Its Implications on Device Performance and Charge Carrier MobilitySebastian F. Hoefler, Georg Haberfehlner, Thomas Rath, Andreas Keilbach, Mathias Hobisch, Alexander Dixon, Egon Pavlica, Gvido Bratina, Gerald Kothleitner, Ferdinand Hofer, Gregor Trimmel, 2019, original scientific article Abstract: In bulk-heterojunction solar cells, the device performance strongly depends on the donor and acceptor properties, the phase separation in the absorber layer, and the formation of a bicontinuous network. While this phase separation is well explored for polymer:fullerene solar cells, only little is known for polymer:nonfullerene acceptor solar cells. The main hurdle in this regard is often the chemical similarity of the conjugated polymer donor and the organic nonfullerene acceptor (NFA), which makes the analysis of the phase separation via atomic force microscopic (AFM) phase images or conventional transmission electron microscopy difficult. In this work, we use the donor polymer PTB7-Th and the small molecule acceptor O-IDTBR as the model system and visualized the phase separation in PTB7-Th:O-IDTBR bulk-heterojunctions with different donor:acceptor ratios via scanning transmission electron microscopy (STEM) high-angle annular dark-field (HAADF) images and electron energy loss spectroscopy (EELS) based elemental mapping, which resulted in a good contrast between the donor and the acceptor despite very low differences in the chemical composition. AFM as well as grazing-incidence wide-angle X-ray scattering (GIWAXS) investigations support the electron microscopic data. Furthermore, we elucidate the implications of the phase separation on the device performance as well as charge carrier mobilities in the bulk-heterojunction layers, and a high performance of the solar cells was found over a relatively broad range of polymer domain sizes. This can be related to the larger domain sizes of the acceptor phase with higher amounts of O-IDTBR in the blend, while the polymer donor phase still forms continuous pathways to the electrode, which keeps the hole mobility at a relatively constant level. Keywords: nanomorphology bulk-heterojunction scanning transmission electron microscopy organic photovoltaics charge carrier mobility Published in RUNG: 15.01.2020; Views: 3564; Downloads: 88 Full text (6,22 MB) |
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16. High Photon Flux 70 eV HHG Source for Applications in Molecular and Solid State PhysicsSteffen Hädrich, Jan Rothhardt, Robert Klas, Maxim Tschernajew, Armin Hoffmann, Valentina Hajek-Tadesse, Arno Klenke, Thomas Gottschall, Tino Eidam, 2016, published scientific conference contribution Keywords: Ultrafast nonlinear optics, Multiharmonic generation, Lasers, fibe Published in RUNG: 20.04.2017; Views: 5363; Downloads: 0 This document has many files! More... |
17. Monte Carlo Studies of the GCT Telescope for the Cherenkov Telescope ArrayThomas Armstrong, Andrej Filipčič, Gašper Kukec Mezek, Samo Stanič, Serguei Vorobiov, Lili Yang, Gabrijela Zaharijas, Danilo Zavrtanik, Marko Zavrtanik, 2015, published scientific conference contribution Keywords: Cherenkov Telescope Array (CTA), GCT: a dual-mirror small-size telescope (SST-2M) design for CTA, Monte Carlo performance studies Published in RUNG: 16.02.2017; Views: 4236; Downloads: 209 Full text (752,33 KB) |
18. Origin of atmospheric aerosols at the Pierre Auger Observatory using studies of air mass trajectories in South AmericaAndrej Filipčič, Thomas Paul, Danilo Zavrtanik, Marko Zavrtanik, Samo Stanič, Darko Veberič, A. Aab, 2014, original scientific article Keywords: kozmični žarki, aerosoli, onesnaženost zraka, Observatorij Pierre Auger Published in RUNG: 16.06.2016; Views: 5409; Downloads: 17 Link to full text |
19. Studies of cosmic rays at the highest energies with the Pierre Auger ObservatoryDarko Veberič, Thomas Paul, Samo Stanič, Andrej Filipčič, Danilo Zavrtanik, Marko Zavrtanik, J. R. T. De Mello Neto, 2014, published scientific conference contribution Keywords: kozmični žarki, spekter, observatoriji Published in RUNG: 16.06.2016; Views: 4364; Downloads: 22 Link to full text |
20. A search for point sources of EeV photonsSerguei Vorobiov, Samo Stanič, Andrej Filipčič, Thomas Paul, Darko Veberič, Danilo Zavrtanik, Marko Zavrtanik, A. Aab, 2014, original scientific article Keywords: kozmični žarki, fotoni, Observatorij Pierre Auger Published in RUNG: 16.06.2016; Views: 5132; Downloads: 21 Link to full text |