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| 1 | Experimental proof of Joule heating-induced switched-back regions in OLEDs显示文摘Organic light-emitting diodes(OLEDs)have become a major pixel technology in the display sector,with products spanning the entire range of current panel sizes.The ability to freely scale the active area to large and random surfaces paired with flexible substrates provides additional application scenarios for OLEDs in the general lighting,automotive,and signage sectors.These applications require higher brightness and,thus,current density operation compared to the specifications needed for general displays.As extended transparent electrodes pose a significant ohmic resistance,OLEDs suffering from Joule self-heating exhibit spatial inhomogeneities in electrical potential,current density,and hence luminance.In this article,we provide experimental proof of the theoretical prediction that OLEDs will display regions of decreasing luminance with increasing driving current.With a two-dimensional OLED model,we can conclude that these regions are switched back locally in voltage as well as current due to insufficient lateral thermal coupling.Experimentally,we demonstrate this effect in lab-scale devices and derive that it becomes more severe with increasing pixel size,which implies its significance for large-area,high-brightness use cases of OLEDs.Equally,these non-linear switching effects cannot be ignored with respect to the long-term operation and stability of OLEDs;in particular,they might be important for the understanding of sudden-death scenarios. | Anton Kirch Axel Fischer Matthias Liero Jurgen Fuhrmann Annegret Glitzky Sebastian Reineke | 2020 | Light(Science & Applications)2020，9，1： | 2 |
| 2 | Carbohydrate and amino acid composition of dissolved organic matter leached from soil显示文摘 | Holger Fischer Axel Meyer Klaus Fischer Yakov Kuzyakov | 2007 | Soil Biology and Biochemistry2007，，11： | 1 |
| 3 | Synergy between CD26/DPP-IV Inhibition and G-CSF Improves Cardiac Function after Acute Myocardial Infarction显示文摘 | Marc-Michael Zaruba Hans Diogenes Theiss Markus Vallaster Ursula Mehl Stefan Brunner Robert David Rebekka Fischer Lisa Krieg Eva Hirsch Bruno Huber Petra Nathan Lars Israel Axel Imhof Nadja Herbach Gerald Assmann Ruediger Wanke Josef Mueller-Hoecker Gerha | 2009 | Cell Stem Cell2009，，4： | 1 |
| 4 | Iloprost to improve surfactant function in porcine pulmonary grafts stored for twenty-four hours in low-potassium dextran solution显示文摘 | Bernhard Gohrbandt Sebastian P. Sommer Stefan Fischer Jens M. Hohlfeld Gregor Warnecke Axel Haverich Martin Strueber | 2005 | The Journal of Thoracic and Cardiovascular Surgery2005，，1： | 1 |
| 5 | Determination of 4-nonylphenol in water samples using 4-(2,6-dime- thylhept-3-yl) phenol as new internal standard显示文摘 | Axel R Fischer Nham Thi Phuong Lan Cornelia Wiedemann | 2010 | Journal of Chro- matography A2010，1217，： | 1 |
| 6 | Substance P released by TRPV1-expressing neurons produces reactive oxygen species that mediate ethanol-induced gastric injury显示文摘 | David Gazzieri Marcello Trevisani Jochen Springer Selena Harrison Graeme S. Cottrell Eunice Andre Paola Nicoletti Daniela Massi Sandra Zecchi Daniele Nosi Marco Santucci Norma P. Gerard Monica Lucattelli Giuseppe Lungarella Axel Fischer Eileen F. Grady Ni | 2007 | Free Radical Biology and Medicine2007，，4： | 1 |
| 7 | Allergic airway inflammation induces the migration of dendritic cells into airway sensory ganglia显示文摘 | Duc Dung Le Sabine Rochlitzer Axel Fischer | 2014 | Respiratory Research2014，15，1： | 1 |
| 8 | Diversity, composition and host-species relationships of epiphytic orchids and ferns in two forests in Nepal显示文摘Epiphytic plant species are an important part of biological diversity. It is therefore essential to understand the distribution pattern and the factors influencing such patterns. The present study is aimed at observing the patterns of species richness, abundances and species composition of epiphytic orchids and ferns in two subtropical forests in Nepal. We also studied the relationship of host plants(Schima wallichii and Quercus lanata) and epiphyte species. Data were collected in Naudhara community forest(CF) and the national forest(NF) in Shivapuri Nagarjun National Park. The data were analyzed using univariate and multivariate tests. In total, we recorded 41 species of epiphytes(33 orchid and 8 fern species). Orchid species abundance is significantlyhigher in CF compared to NF. Orchid species richness and abundance increased with increasing southern aspect whereas it decreased with increasing canopy cover, and fern species richness increased with host bark roughness. Orchid abundance was positively correlated with increasing bark p H, stem size, tree age and tree height and negatively correlated with increasing steepness of the area. Likewise, fern abundances were high in places with high canopy cover, trees that were tall and big, but decreased with increasing altitude and southern aspect. The composition of the orchid and fern species was affected by altitude, aspect, canopy cover, DBH, number of forks and forest management types. We showed that the diversity of orchid and fern epiphytes is influenced by host characteristics as well as host types. The most important pre-requisite for a high epiphyte biodiversity is the presence of oldrespectively tall trees, independent of the recent protection status. This means:(i) for protection, e.g.in the frame of the national park declaration, such areas should be used which host such old tall trees;and(ii) also in managed forests and even in intensively used landscapes epiphytes can be protected by letting a certain number of trees be and by giving them space to grow old and tall. | Yagya P. ADHIKARI Anton FISCHER Hagen S.FISCHER Maan B.ROKAYA Prakash BHATTARAI Axel GRUPPE | 2017 | Journal of Mountain Science2017，14，6： | 1 |
| 9 | Determination of 4-nonylphenol in water samples using 4-(2,6-dimethylhept-3-yl) phenol as new internal standard显示文摘 | AXEL R Fischer NHAM Thi Phuong Lan CORNELIA Wiedemann | 2010 | Journal of Chromatography A2010，1217，： | 1 |
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