TY - GEN A1 - Stohwasser, Ralf A1 - Holzhütter, Hermann-Georg A1 - Lehmann, Undine A1 - Henklein, Peter A1 - Kloetzel, Peter-Michael T1 - Hepatitis B virus HBx peptide 116-138 and proteasome activator PA28 compete for binding to the proteasome alpha4/MC6 subunit. T2 - Biological Chemistry Y1 - 2003 U6 - https://doi.org/10.1515/BC.2003.005 SN - 1437-4315 SN - 1431-6730 VL - 384 IS - 1 SP - 39 EP - 49 ER - TY - GEN A1 - Langendörfer, Peter A1 - Piotrowski, Krzysztof A1 - Peter, Steffen A1 - Lehmann, Martin T1 - Crosslayer Firewall Interaction as a Means to Provide Effective and Efficient Protection at Mobile Devices Y1 - 2007 ER - TY - JOUR A1 - Stücke, Peter A1 - Lehmann, B. A1 - Scurtu, Nicoleta A1 - Egbers, Christoph T1 - Eccentric Couette Flow with Superimposed Crossflow Y1 - 2008 ER - TY - RPRT A1 - Lehmann, J. A1 - Langendörfer, Peter T1 - Abschlußbericht Feldtest, Empfehlungen Y1 - 2005 ER - TY - RPRT A1 - Lehmann, B. A1 - Langendörfer, Peter T1 - Ergebnisbericht Wireless Internet - zellular Y1 - 2004 ER - TY - GEN A1 - Tarnawska, Lidia Lupina A1 - Dabrowski, Jarek Marek A1 - Grzela, Tomasz A1 - Niermann, T. A1 - Lehmann, M. A1 - Storck, Peter A1 - Schröder, Thomas T1 - Interface science of virtual GaN substrates on Si(111) via Sc2O3/Y2O3 buffers: Experiment and Theory T2 - Journal of Applied Physics Y1 - 2013 SN - 0021-8979 VL - 113 IS - 21 SP - 213507 EP - 213507 ER - TY - GEN A1 - Niu, Gang A1 - Capellini, Giovanni A1 - Lupina, Grzegorz A1 - Niermann, Tore A1 - Salvalaglio, Marco A1 - Marzegalli, Anna A1 - Schubert, Markus Andreas A1 - Zaumseil, Peter A1 - Krause, Hans-Michael A1 - Skibitzki, Oliver A1 - Lehmann, Michael A1 - Montalenti, Francesco A1 - Xie, Ya-Hong A1 - Schröder, Thomas T1 - Photodetection in hybrid single layer graphene/fully coherent Ge island nanostructures selectively grown on Si nano-tip patterns T2 - ACS Applied Materials and Interfaces Y1 - 2016 SN - 1944-8252 VL - 8 IS - 3 SP - 2017 EP - 2026 ER - TY - GEN A1 - Niu, Gang A1 - Capellini, Giovanni A1 - Schubert, Markus Andreas A1 - Niermann, Tore A1 - Zaumseil, Peter A1 - Katzer, Jens A1 - Krause, Hans-Michael A1 - Skibitzki, Oliver A1 - Lehmann, Michael A1 - Xie, Ya-Hong A1 - Känel, Hans von A1 - Schröder, Thomas T1 - Dislocation-free Ge nano-crystals via pattern dependent selective Ge heteroepitaxy on Si nano-tip wafers T2 - Scientific Reports Y1 - 2016 U6 - https://doi.org/10.1038/srep22709 SN - 2045-2322 VL - 6 SP - 22709 ER - TY - GEN A1 - Niu, Gang A1 - Capellini, Giovanni A1 - Hatami, Fariba A1 - Bartolomeo, Antonio di A1 - Niermann, Tore A1 - Hameed, Hussein Emad A1 - Schubert, Markus Andreas A1 - Krause, Hans-Michael A1 - Zaumseil, Peter A1 - Skibitzki, Oliver A1 - Masselink, William T. A1 - Lehmann, Michael A1 - Xie, Ya-Hong A1 - Schröder, Thomas T1 - Selective Epitaxy of InP on Si and Rectification in Graphene/InP/Si Hybrid Structure T2 - ACS Applied Materials and Interfaces Y1 - 2016 U6 - https://doi.org/10.1021/acsami.6b09592 SN - 1944-8244 SN - 1944-8252 VL - 8 IS - 40 SP - 26948 EP - 26955 ER - TY - GEN A1 - Martin, Frank A1 - Lehmann, Mario A1 - Schläger, Peter A1 - Sack, Ulrich A1 - Anderer, Ursula T1 - Differentiation capacity of chondrocytes in microtissues depends on TGF-ß subtyp T2 - Journal of biochips & tissue chips : JBTC KW - microtissues KW - differentiation of chondrocytes KW - TGF-β subtypes KW - BMP-7 Y1 - 2012 U6 - https://doi.org/10.4172/2153-0777.S2-002 SN - 2153-0777 N1 - Special Issue Article VL - S2 IS - 002 ER - TY - GEN A1 - Moncsek, Anja A1 - Gruner, Melanie A1 - Meyer, Hannes A1 - Lehmann, Andrea A1 - Kloetzel, Peter-Michael A1 - Stohwasser, Ralf T1 - Evidence for anti-apoptotic roles of proteasome activator 28g via inhibiting caspase activity T2 - Apoptosis Y1 - 2015 U6 - https://doi.org/10.1007/s10495-015-1149-6 SN - 1573-675X VL - 20 IS - 9 SP - 1211 EP - 1228 ER - TY - GEN A1 - Berg, Heinz Peter A1 - Himmelberg, Axel A1 - Lehmann, Mario A1 - Dückershoff, Roland A1 - Neumann, Mathias T1 - The Turbo-Fuel-Cell 1.0 – family concept - Compact Micro Gas Turbine (MGT) – Solid Oxide Fuel Cell (SOFC) energy converters in the 100 - 500 kW electrical power range for the future T2 - IOP conference series : Materials Science and Engineering N2 - The “Turbo-Fuel-Cell-Technology” has been described as a MGT-SOFC hybrid system consisting of a recuperated micro gas turbine (MGT) process with an embedded solid oxide fuel cell (SOFC) subsystem. SOFC stacks are connected to “SOFC stack grapes” and are equipped with the so called HEXAR-Module. This module is composed of a high-temperature heat exchanger (HEX), an afterburner (A) and a steam reformer (R). The MGT-concept is based on a generator driven directly by the turbomachine and a recuperator, which returns the exhaust heat to the pressurized compressor outlet air. This provides the necessary base for a highly effective, pure MGT process and the “MGT-SOFC-high-efficiency process”. This paper describes the concept and the thermodynamic background of a highly effective and compact design of the “Turbo-Fuel-Cell 1.0-Family” in the electrical performance class from 100 to 500kW. The technological state of the system is shown and a rating of the system with comparative parameters is discussed. It becomes visible that all necessary basic technologies should be available and that the technology (for stationary applications) can have the “entry into services (E.I.S.)” in the next 10 years. The MGT-SOFC performance map under different operation conditions is discussed. This article also provides an overview of the research on MGT-SOFC-Systems and the scenario of an energy supply network and a mobile energy conversion of the future introduction. KW - MGT-SOFC KW - Brennstoffzellen KW - Mikrogasturbinen KW - Hybrid Y1 - 2018 UR - http://iopscience.iop.org/article/10.1088/1757-899X/297/1/012004 U6 - https://doi.org/doi:10.1088/1757-899X/297/1/012004 SN - 1757-899X VL - 297 ER - TY - GEN A1 - Berg, Heinz Peter A1 - Kleissl, Marko A1 - Himmelberg, Axel A1 - Lehmann, Mario A1 - Prechavut, Nontavut A1 - Vorpahl, Michael ED - Prukvilailert, Monchai T1 - Heat balancing of direct reforming fuel cells in MGT-SOFC hybrid systems T2 - 9th Thai Society of Mechanical Engineers, International Conference on Mechanical Engineering (TSME-ICoME 2018) 11–14 December 2018, Phuket, Thailand N2 - Solid oxide fuel cells convert chemical energy in electrical energy and are highly suitable for the conversion of hydrocarbon based fuels and products from PowerToGas conversions. Embedded in a micro gas turbine-cycle instead of the combustion chamber the heat energy of the injected fuel, released in the SOFC-Stack, can additionally converted into work and by a turbine-generator into electricity. In a compact system, SOFC stacks are designed to realize a direct steam-reforming process inside. In such direct-reforming fuel cell systems the SOFC operating temperature due to the heat demand for reforming, can be reduced to a value in the range of the outlet temperature of the downstream flow (650°C). If the cycle uses a recuperating system, the operating conditions of the SOFC can be realized without additional high-temperature heat exchanger systems. The system with an uncooled turbine, described in [1], just can reach the operating temperature with an additional high-temperature heat exchange. The system described in this publication does not require an additional high-temperature heat exchanger, because the X-value, as the ratio between the exchanged heat quantity and the required amount of heat to complete the MGT-cycle [2] due to the referring process, is nearly zero and can be realized via the inner container wall (of the MLC). The cycle is completed (between the SOFC and the turbine entry) by the heat input of an afterburner. Here the unreacted fuel of the SOFC fuel-stream is used to provide the necessary heat energy for the downstream turbo-generator-system. KW - MGT-SOFC KW - Heat balancing KW - simulation KW - thermodynamic cycle KW - effectivity Y1 - 2018 UR - https://iopscience.iop.org/article/10.1088/1757-899X/501/1/012007/meta U6 - https://doi.org/10.1088/1757-899X/501/1/012007 SN - 1757-899X SP - 50 EP - 60 PB - IOP Publishing/IOP Science CY - Bristol ET - 1. Auflage ER - TY - GEN A1 - Glasauer, Stefan A1 - Lehnen, Nadine A1 - Radziej, Katharina A1 - Weigel, Angelika A1 - Känel, Roland von A1 - Pitron, Victor A1 - Van den Bergh, Omer A1 - Löwe, Bernd A1 - Lehmann, Marco A1 - Henningsen, Peter T1 - Complementing conceptual models of persistent somatic symptoms with mathematical formalization T2 - Psychosomatic Medicine Y1 - 2020 U6 - https://doi.org/10.1097/PSY.0000000000000801 SN - 1534-7796 ER - TY - GEN A1 - Dückershoff, Roland A1 - Berg, Heinz Peter A1 - Himmelberg, Axel A1 - Lehmann, Mario A1 - Kleissl, Marko ED - Ashton, Anete T1 - Influence on the Electrical Efficiency of a Hybrid MGT-SOFC-System by μ-fogging in a-Two-Staged Compressor System T2 - IOP Conference Series: Materials Science and Engineering N2 - Hybrid combinations of solid oxide fuel cell and recuperated micro gas turbines can convert the chemical energy of hydrocarbon-based fuels in electrical energy with high electrical efficiency. With an integrated and improved cycle management, more than 70% of the energy content of the fuel could be converted. Therefore, the systems are highly suitable for the Power-To-Gas conversion. In particular, a pressure charging of the SOFC fuel cell leads to an increase in stack performance. By a downstream turbo set, after residual fuels are intentionally oxidized with an afterburner, additional electrical energy can be gained from the expansion of the hot exhaust gas stream and the overall efficiency can be increased. In order to increase the electrical efficiency of the system, it is proposed, to ensure the required compression of the process air in particular by a-two-staged turbo compressor with an intermediate cooling system. By thus achievable reduction of the dissipation of the compressor and by targeted condensation of finest drops in front of the second compressor stage affected by intermediate cooling, an increase in efficiency of the system is possible. This is achieved by targeted cooling of the process air behind a low pressure compression, so that it is saturated over 100% relative air humidity. As a result, a slightly supersaturated airflow is available for the second compressor stage, which enters the compressor after heat removal via an intermediate cooling having a small number of microdroplets. Therefore, the condensed water evaporates again by the heat of compression in the second stage and the compressed flow ultimately enters the recuperation at a lower temperature than during normal compression. Thus, more heat can be recovered within the recuperation system. Therefore, the electrical energy of the system can be produced having higher efficiency, because the heat dissipation of the overall system decreases. In this article it is presented, how such a process is thermodynamically modelled and how a technical realization can be built after optimization by simulations. Finally, in this study, the process-influencing factors are analyzed to show the highest possible electrical yield of such a system. KW - Micro Gasturbine, Hybrid, SOFC Fuel Cell, Fogging, Efficiency Y1 - 2020 UR - https://iopscience.iop.org/article/10.1088/1757-899X/886/1/012041 U6 - https://doi.org/10.1088/1757-899X/886/1/012041 SN - 1757-899X SP - 1 EP - 8 PB - IOP Science CY - Bristol ET - 1. Auflage ER - TY - CHAP A1 - Stücke, Peter A1 - Lehmann, B. A1 - Scurtu, Nicoleta A1 - Egbers, Christoph T1 - LDA-Messung in Zylinderspaltströmungen bei engen Spaltweiten Y1 - 2006 ER - TY - CHAP A1 - Berg, Heinz Peter A1 - Dückershoff, Roland A1 - Lehmann, Mario A1 - Prechavut, Nontavut T1 - Micro Turbo-Fuel-Cell-Technology : Hybrid compact turbo machinery technology and thermodynamic aspects regarding design parameters of a high efficient MGT-SOFC-system T2 - 12th European Conference on Turbomachinery Fluid dynamics & Thermodynamics N2 - The improvement of decentralised energy supply systems has received an important role in the recent years. One option is the combination of SOFC with recuperated MGT. Here, a new strategy for selecting the system parameters, such as the operating temperature of the SOFC, turbine inlet temperature and the pressure ratio of the hybrid system, is presented. By introducing the heat ratio between the heat required to increase the process gas to the SOFC operating temperature and the heat required to raise the SOCF exhaust gas to the TIT, it was found that high efficiency (approx. 68%) is realisable in a compact hybrid system today. Analysis also shows that the HEX-technology is needed to improve the system effectiveness. Also, high recirculation rates with lower TIT can be considered as the future development direction. In addition, a sample configuration of an oil-free MGT rotor unit with high speed foil bearings is presented. KW - MGT-SOFC KW - Brennstoffzellen KW - Mikrogasturbinen KW - Hybrid Y1 - 2017 UR - http://www.euroturbo.eu/paper/ETC2017-266.pdf U6 - https://doi.org/10.29008/ETC2017-266 SP - 1 EP - 12 ER - TY - CHAP A1 - Lehmann, Mario A1 - Voß, Fränzi A1 - Martin, Frank A1 - Schläger, Peter A1 - Anderer, Ursula T1 - Chondrogenic microtissues in the lab & for the clinic T2 - 3D cell culture 2016, book of abstracts, DECHEMA Biotechnologie KW - in vitro cartilage defect KW - in vitro therapy model KW - chondrocyte-derived cell line Y1 - 2016 SN - 978-3-89746-182-6 SP - 52 EP - 53 PB - DECHEMA e.V. CY - Frankfurt am Main ER - TY - CHAP A1 - Berg, Peter A1 - Dückershoff, Roland A1 - Lehmann, Mario A1 - Prechavut, Nontavut T1 - Micro Turbo-Fuel-Cell-Technology: Hybrid compact turbo machinery technology and thermodynamic aspects regarding design parameters of a high efficient MGT-SOFC-system T2 - Proceedings of 12th European Conference on Turbomachinery Fluid dynamics & Thermodynamics, ETC12, April 3 - 7, 2017, Stockholm, Sweden N2 - The improvement of decentralised energy supply systems has received an important role in the recent years. One option therefore is the combination of SOFC with a recuperated MGT. Here, a new strategy for selecting the system parameters, such as the operating temperature of the SOFC, the turbine inlet temperature and the pressure ratio of the hybrid system, is presented. By introducing the heat ratio between the heat required to increase the process gas to the SOFC operating temperature and the heat required to raise the SOCF exhaust gas to the TIT, it was found that high efficiency (approx. 68%) is realisable in a compact hybrid system today. Analysis also shows that the HEX-technology is needed to improve the system effectiveness. Also, high recirculation rates with lower TIT can be considered as the future development direction. In addition, a sample configuration of an oil-free MGT rotor unit with high speed foil bearings is presented. KW - Turbo machinery KW - SOFC KW - Thermodynamic KW - CHP KW - Foil bearings Y1 - 2017 UR - http://www.euroturbo.eu/paper/ETC2017-266.pdf ER - TY - GEN A1 - Krüger-Genge, Anne A1 - Jung, Friedrich A1 - Küpper, Jan-Heiner A1 - Lehmann, Christian A1 - Franke, Ralf-Peter T1 - Actin type and distribution in erythrocytes T2 - Journal of Cellular Biotechnology N2 - Erythrocytes transport oxygen from the lungs to the tissues. The excess surface area together with the elasticity of the erythrocyte cell membrane provides the flexibility needed to pass through the microvasculature where the oxygen exchange occurs. Although the architecture of the red cell and its membrane-associated cytoskeletal network is known in general, the factors that control the characteristic shape change during echinocyte formation are poorly understood. In this short report we show that in echinocytes a completely reorganized membrane cytoskeleton with a box-like structure of actin filaments prevailed indicating the importance of the actin cytoskeleton during echinocyte formation. KW - Erythrocytes KW - echinocytes KW - submembraneous cytoskeleton KW - actin Y1 - 2018 UR - https://content.iospress.com/articles/journal-of-cellular-biotechnology/jcb179014 U6 - https://doi.org/10.3233/JCB-179014 SN - 2352-3697 SN - 2352-3689 VL - 3 IS - 2 SP - 81 EP - 83 ER -