TY - RPRT A1 - Lunn, A. S. A1 - Tittelbach-Helmrich, Klaus A1 - Krause, F.-M. A1 - Becker, T. A1 - Cheetham, B. A1 - Kuhn, M. A1 - Methfessel, Michael A1 - Ettafagh, A. A1 - Secall, M. A1 - Spegel, M. T1 - Design of PAL and Voice Optimisation for WLAN Y1 - 2004 ER - TY - GEN A1 - Sullivan, J. T. A1 - Wilks, Regan G. A1 - Winkler, M. T. A1 - Weinhardt, Lothar A1 - Recht, D. A1 - Said, A. J. A1 - Newman, B. K. A1 - Zhang, Y. A1 - Blum, Monika A1 - Krause, S. A1 - Yang, Wan Li A1 - Heske, Clemens A1 - Aziz, M. J. A1 - Bär, Marcus A1 - Buonassisi, T. T1 - Soft x-ray emission spectroscopy studies of the electronic structure of silicon supersaturated with sulfur N2 - We apply soft x-ray emission spectroscopy (XES) to measure the electronic structure of crystalline silicon supersaturated with sulfur (up to 0.7 at. %), a candidate intermediate-band solar cell material. Si L2,3 emission features are observed above the conventional Si valence band maximum, with intensity scaling linearly with S concentration. The lineshape of the S-induced features change across the insulator-to-metal transition, indicating a significant modification of the local electronic structure concurrent with the change in macroscopic electronic behavior. The relationship between the Si L2,3 XES spectral features and the anomalously high sub-band gap infrared absorption is discussed. KW - black silicon KW - solar cells KW - electronic surface structure KW - x-ray emission spectroscopy Y1 - 2011 ER - TY - GEN A1 - Blaen, Phillip J. A1 - Kurz, Marie Juliette A1 - Drummond, Jennifer D. A1 - Knapp, Julia L. A. A1 - Mendoza-Lera, Clara A1 - Schmadel, Noah M. A1 - Klaar, Megan A1 - Jäger, Anna A1 - Folegot, Silvia A1 - Lee-Cullin, Joseph A1 - Ward, Adam A1 - Zarnetske, Jay A1 - Datry, Thibault A1 - Milner, Alexander A1 - Lewandowski, Jörg A1 - Hannah, David M. A1 - Krause, Stefan T1 - Woody debris is related to reach-scale hotspots of lowland stream ecosystem respiration under baseflow conditions T2 - Ecohydrology : ecosystems, land and water process interactions, ecohydrogeomorphology KW - Stream metabolism KW - ecosystem respiration Y1 - 2018 U6 - https://doi.org/10.1002/eco.1952 SN - 1936-0592 SN - 1936-0584 ER - TY - GEN A1 - Kelleher, Christa A1 - Ward, Adam Scott A1 - Knapp, Julia L. A. A1 - Blaen, Phillip J. A1 - Kurz, Marie Juliette A1 - Drummond, Jennifer D. A1 - Zarnetske, Jay A1 - Hannah, David M. A1 - Mendoza-Lera, Clara A1 - Schmadel, Noah M. A1 - Datry, Thibault A1 - Lewandowski, Jörg A1 - Krause, Stefan T1 - Exploring Tracer Information and Model Framework Trade‐offs to Improve Estimation of Stream Transient Storage Processes T2 - Water Resources Research KW - transient storage modeling KW - smart tracer Y1 - 2019 U6 - https://doi.org/10.1029/2018WR023585 SN - 0043-1397 SN - 1944-7973 VL - 55 IS - 4 SP - 3481 EP - 3501 ER - TY - RPRT A1 - Spegel, M. A1 - Reinhardt, P. A1 - Cheetham, B. A1 - Lunn, A. S. A1 - Krause, F.-M. A1 - Tittelbach-Helmrich, Klaus T1 - Final System Performance and Validation Report Y1 - 2006 ER - TY - RPRT A1 - Spegel, M. A1 - Lunn, A. S. A1 - Krause, F.-M. A1 - Wellhausen, T. A1 - Tittelbach-Helmrich, Klaus A1 - Reinhardt, P. A1 - Cheetham, B. T1 - 506746 - WINDECT STP D2.2 Technical Specification of 173, Demonstration System Y1 - 2004 ER - TY - GEN A1 - Bär, Marcus A1 - Schubert, Björn-Arvid A1 - Marsen, Björn A1 - Wilks, Regan G. A1 - Blum, M. A1 - Krause, S. A1 - Pookpanratana, Sujitra A1 - Zhang, Y. A1 - Unold, Thomas A1 - Yang, W. A1 - Weinhardt, Lothar A1 - Heske, Clemens A1 - Schock, Hans-Werner T1 - Cu2ZnSnS4 thin-film solar cell absorbers illuminated by soft x-rays T2 - Journal of Materials Research N2 - In view of the complexity of thin-film solar cells, which are comprised of a multitude of layers, interfaces, surfaces, elements, impurities, etc., it is crucial to characterize and understand the chemical and electronic structure of these components. Because of the high complexity of the Cu2ZnSn(S,Se)4 compound semiconductor absorber material alone, this is particularly true for kesterite-based devices. Hence, this paper reviews our recent progress in the characterization of Cu2ZnSnS4 (CZTS) thin films. It is demonstrated that a combination of different soft x-ray spectroscopies is an extraordinarily powerful method for illuminating the chemical and electronic material characteristics from many different perspectives, ultimately resulting in a comprehensive picture of these properties. The focus of the article will be on secondary impurity phases, electronic structure, native oxidation, and the CZTS surface composition. Y1 - 2012 U6 - https://doi.org/10.1557/jmr.2012.59 SN - 2044-5326 VL - 27 IS - 8 SP - 1097 EP - 1104 ER - TY - CHAP A1 - Bauriegel, E. A1 - Krause, M. A1 - Wiegleb, Gerhard ED - Wiegleb, Gerhard ED - Bröring, Udo ED - Mrzljak, Jadranka ED - Schulz, Friederike T1 - Renaturierung und Initialsetzung von Trockenrasen in der Bergbaufolgelandschaft T2 - Naturschutz in Bergbaufolgelandschaften - Landschaftsanalyse und Leitbildentwicklung Y1 - 2000 SN - 3-7908-1279-X SP - 177 EP - 201 PB - Physica-Verlag CY - Heidelberg ER - TY - CHAP A1 - Reiche, Manfred A1 - Kittler, Martin A1 - Krause, M. A1 - Übensee, Hartmut ED - Cavallini, Anna ED - Estreicher, Stefan K. T1 - Carrier Transport on Dislocations T2 - International Conference on Defects in Semiconductors 2013, proceedings of the 27th International Conference on Defects in Semiconductors, ICDS-2013, Bologna, Italy, 21-26 July 2013 Y1 - 2014 SN - 978-0-7354-1215-6 U6 - https://doi.org/10.1063/1.4865599 PB - AIP Publishing CY - Melville, New York ER - TY - GEN A1 - Mirsky, Vladimir M. A1 - Riepl, Michael A1 - Krause, Christian A1 - Novotny, Ivan A1 - Splonskowski, Markus A1 - Rehacek, Vlastimil A1 - Tvarozek, Vladimir A1 - Hummel, Helmut A1 - Wolfbeis, Otto S. T1 - Thin film electrodes for capacitive chemo- and biosensors: an optimization of the electrodes geometry T2 - Materials Science Forum KW - Biosensor KW - Capacitance KW - Chemical Sensors KW - Electrode Y1 - 1998 U6 - https://doi.org/10.4028/www.scientific.net/MSF.287-288.423 SN - 1662-9752 VL - 287-288 SP - 423 EP - 426 ER - TY - GEN A1 - Mirsky, Vladimir M. A1 - Mass, Markus A1 - Krause, Christian A1 - Wolfbeis, Otto S. T1 - Capacitive approach to determine phospholipase A2 activity towards artificial and natural substrates T2 - Analytical Chemistry N2 - A capacitive approach has been employed to develop a novel method to determine phospholipase activity. The sensing electrodes have a structure like Au/S(CH₂)₁₇CH₃/substrate/electrolyte. Hydrolysis of the substrate, mediated by phospholipase A₂, leads to the formation of water-soluble products from the insoluble substrate. This results in desorption of these products into aqueous phase and corresponding increase of the electrode capacitance. The requirement of high water solubility of the reaction products can be achieved in two ways. In the first, short-chain phospholipids are used as the substrate, in which case, water-soluble products are formed and no additional reagents are required to promote desorption of these products. The sensors prepared by this strategy provide sensitive qualitative detection of phospholipases. The second way is based on the use of a water-soluble acceptor (for example, β-cyclodextrin) to solubilize the products of hydrolysis. It allows semiquantitative detection of phospholipase activity toward long-chain natural substrates. The reaction kinetics for this case was found to be monoexponential and linearly dependent on the phospholipase concentration. The detection limit of this method, as tested with phospholipase A₂ from bee venom and soy bean lecithin as the substrate, is ∼0.5 ng/mL (500 μunits/mL). Y1 - 1998 U6 - https://doi.org/10.1021/ac980102w SN - 0003-2700 SN - 1520-6882 VL - 70 IS - 17 SP - 3674 EP - 3678 ER -