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Recent Submissions
- ItemPlasma Technology: An Emerging Technology for Energy Storage(Washington, DC : American Chemical Society, 2018) Bogaerts, Annemie; Neyts, Erik C.Plasma technology is gaining increasing interest for gas conversion applications, such as CO2 conversion into value-added chemicals or renewable fuels, and N2 fixation from the air, to be used for the production of small building blocks for, e.g., mineral fertilizers. Plasma is generated by electric power and can easily be switched on/off, making it, in principle, suitable for using intermittent renewable electricity. In this Perspective article, we explain why plasma might be promising for this application. We briefly present the most common types of plasma reactors with their characteristic features, illustrating why some plasma types exhibit better energy efficiency than others. We also highlight current research in the fields of CO2 conversion (including the combined conversion of CO2 with CH4, H2O, or H2) as well as N2 fixation (for NH3 or NOx synthesis). Finally, we discuss the major limitations and steps to be taken for further improvement.
- ItemPerovskite phase heterojunction solar cells(London : Nature Publishing Group, 2022) Ji, Ran; Zhang, Zongbao; Hofstetter, Yvonne J.; Buschbeck, Robin; Hänisch, Christian; Paulus, Fabian; Vaynzof, YanaModern photovoltaic devices are often based on a heterojunction structure where two components with different optoelectronic properties are interfaced. The properties of each side of the junction can be tuned by either utilizing different materials (for example, donor/acceptor) or doping (for example, p–n junction) or even varying their dimensionality (for example, 3D/2D). Here we demonstrate the concept of phase heterojunction (PHJ) solar cells by utilizing two polymorphs of the same material. We demonstrate the approach by forming γ-CsPbI3/β-CsPbI3 perovskite PHJ solar cells. We find that all of the photovoltaic parameters of the PHJ device significantly surpass those of each of the single-phase devices, resulting in a maximum power conversion efficiency of 20.1%. These improvements originate from the efficient passivation of the β-CsPbI3 by the larger bandgap γ-CsPbI3, the increase in the built-in potential of the PHJ devices enabled by the energetic alignment between the two phases and the enhanced absorption of light by the PHJ structure. The approach demonstrated here offers new possibilities for the development of photovoltaic devices based on polymorphic materials.
- ItemProdukthaftung in der Apotheke(Stuttgart : Deutscher Apotheker Verlag, 2005) Diebold, Steffen M.Stellt ein Apotheker Arzneimittel, Medizinprodukte oder andere apothekenübliche Waren (z.B. Kosmetika oder Mixturen nach Angaben von Heilpraktikern, Homöopathen oder Anthroposophen) in seiner Offizin selbst her, so haftet er (grundsätzlich) einem dadurch ggf. geschädigten Kunden (auch) nach den Vorschriften des Produkthaftungsgesetzes. Diese Haftung besteht unabhängig vom eigenen Verschulden. Sie greift auch bei der Einfuhr von Arzneimitteln aus Staaten, die nicht zum Europäischen Wirtschaftsraum gehören, sowie bei Import und Abgabe von aus Drittländern eingeführten und im Geltungsbereich des Arzneimittelgesetzes (AMG) nicht zugelassenen Fertigarzneimitteln nach § 73 (3) AMG.
- ItemWorkshop on "Sensor-supported detection of pests in outdoor cultivation" at the Leibniz Institute for Agricultural Engineering and Bioeconomy in Potsdam-Bornim (ATB), May 11 and 12, 2022(Berlin, Heidelberg : Springer, 2023) Dammer, Karl-Heinz
- ItemLess extreme and earlier outbursts of ice-dammed lakes since 1900(London [u.a.] : Nature Publ. Group, 2023) Veh, Georg; Lützow, Natalie; Tamm, Jenny; Luna, Lisa V.; Hugonnet, Romain; Vogel, Kristin; Geertsema, Marten; Clague, John J.; Korup, OliverEpisodic failures of ice-dammed lakes have produced some of the largest floods in history, with disastrous consequences for communities in high mountains1–7. Yet, estimating changes in the activity of ice-dam failures through time remains controversial because of inconsistent regional flood databases. Here, by collating 1,569 ice-dam failures in six major mountain regions, we systematically assess trends in peak discharge, volume, annual timing and source elevation between 1900 and 2021. We show that extreme peak flows and volumes (10 per cent highest) have declined by about an order of magnitude over this period in five of the six regions, whereas median flood discharges have fallen less or have remained unchanged. Ice-dam floods worldwide today originate at higher elevations and happen about six weeks earlier in the year than in 1900. Individual ice-dammed lakes with repeated outbursts show similar negative trends in magnitude and earlier occurrence, although with only moderate correlation to glacier thinning8. We anticipate that ice dams will continue to fail in the near future, even as glaciers thin and recede. Yet widespread deglaciation, projected for nearly all regions by the end of the twenty-first century9, may bring most outburst activity to a halt.