TY - PAT A1 - Beyer, T. A1 - Krause, F.-M. A1 - Methfessel, Michael A1 - Tittelbach-Helmrich, Klaus A1 - Lunn, A. S. T1 - Verfahren für drahtlosen Handover bei Datenströmen über WLAN Systeme Y1 - 2005 ER - TY - CHAP A1 - Krause, S. A1 - Krautz, Hans Joachim A1 - Lehmann, J. A1 - Luschtinetz, Thomas A1 - Kruse, T. T1 - Operating regime of a hydrogen-storage-loop power plant of grid relevant dimensions T2 - Proceedings of the 14th International Symposium on Heat Transfer and Renewable Sources of Energy, Szczecin-Miedzyzdroje, Poland, September 06-09, 2012 Y1 - 2012 SN - 978-83-7663-121-9 PB - Wydawnistwo Uczelnianie ZUT CY - Szczecinie 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 - 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 - 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 - 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 - CHAP A1 - Ziems, Christian A1 - Tannert, Daniel A1 - Tillmann, Christine A1 - Krüger, Perco A1 - Krause, S. A1 - Krautz, Hans Joachim T1 - Untersuchungen zur fortschrittlichen alkalischen Druckelektrolyse am Wasserstoff-Forschungszentrum Cottbus Y1 - 2011 ER - TY - CHAP A1 - Krause, S. A1 - Tillmann, Christine A1 - Krautz, Hans Joachim A1 - Miege, A. A1 - Lehmann, J. A1 - Schünemann, G. T1 - Wasserstoffspeicherkraftwerk - Betrachtungen zur Wirtschaftlichkeit Y1 - 2011 ER - TY - PAT A1 - Becker, T. A1 - Krause, F.-M. A1 - Methfessel, Michael A1 - Tittelbach-Helmrich, Klaus A1 - Lunn, A. S. T1 - Verfahren für drahtlosen Handover bei Datenströmen über WLAN Systeme Y1 - 2004 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 - 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 -