TY - JOUR A1 - Fredebeul-Krein, Markus T1 - Wirtschaftskrise : Staatliche Förderung von glasfaserbasierten Breitbandnetzen? JF - Wirtschaftsdienst N2 - Glasfaserbasierte Breitbandnetze werden in Deutschland auch aufgrund der Wirtschaftskrise nur sehr zögerlich ausgebaut. Markus Fredebeul-Krein hält eine staatliche Subventionierung der Breitbandnetze nur bedingt für gerechtfertigt. Private Investoren benötigen jedoch dringend Planungssicherheit durch verlässliche Regulierungsvorschriften. Y1 - 2010 SN - 0043-6275 VL - 90 IS - 2 SP - 113 EP - 117 PB - ZBW CY - Berlin ER - TY - JOUR A1 - Fredebeul-Krein, Markus T1 - Die Abschaffung der Studiengebühren ist der falsche Weg! JF - Der Ordnungspolitische Kommentar Y1 - 2010 N1 - Herausgegeben vom Institut für Wirtschaftspolitik an der Universität zu Köln sowie dem Otto-Wolff-Institut für Wirtschaftsordnung ER - TY - JOUR A1 - Hirschfeld, Julian A. A1 - Lustfeld, Hans A1 - Reißel, Martin A1 - Steffen, Bernhard T1 - A novel scheme for precise diagnostics and effective stabilization of currents in a fuel cell stack JF - International Journal of Energy Research N2 - A novel scheme for detecting inhomogeneous internal currents in a fuel cell stack is presented. In this paper the scheme is investigated for the case that the flow field plates consist of graphite. Then plates of high conductivity, e.g. aluminium between the flow field plates together with small slits in these plates have three effects: (a) Whenever a local inhomogeneity of the electric current occurs at a particular cell in the stack, this will induce a surface current close to that cell perpendicular to the averaged current. This current can be detected. (b) The plates of high conductivity completely prevent the inhomogeneities from spreading to neighbouring cells. (c) Even at the particular cell the inhomogeneity is suppressed as far as possible. Thus this scheme leads to much better diagnostic possibilities and at the same time reduces electric instabilities to an extent, where they probably become harmless. This scheme will first be explained for a simple model to clarify the idea. However, very precise three dimensional computations using realistic parameters are presented, corroborating the results of the simple model. Y1 - 2010 U6 - https://doi.org/10.1002/er.1662 SN - 0363-907X VL - 34 IS - 3 SP - 293 EP - 301 PB - Wiley CY - London ER - TY - JOUR A1 - Scholz, A. A1 - Ley, Wilfried A1 - Dachwald, Bernd A1 - Miau, J. J. A1 - Juang, J. C. T1 - Flight results of the COMPASS-1 picosatellite mission JF - Acta Astronautica N2 - The mission of the COMPASS-1 picosatellite is to take pictures of the earth, to validate a space-borne GPS receiver developed by the German Aerospace Center, and to verify the proper operation of the magnetic attitude control system in orbit. The spacecraft was launched on April 28, 2008 from the Indian space port Sriharikota, as part of the PSLV-C9 world record launch that simultaneously brought ten satellites into orbit. The mission operations were carried out from the ground stations in Aachen and Tainan. Arising difficulties in the communication link were overcome with the support of individuals from the amateur radio community. After several months of mission operation, abundant housekeeping and mission data has been commanded, received and analyzed and is presented in this paper. Y1 - 2010 U6 - https://doi.org/10.1016/j.actaastro.2010.06.040 SN - 0094-5765 VL - 76 IS - 9-10 SP - 1289 EP - 1298 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Hirschfeld, Julian A. A1 - Lustfeld, Hans A1 - Reißel, Martin A1 - Steffen, Bernhard T1 - Tomographic diagnostics of current distributions in a fuel cell stack JF - International Journal of Energy Research N2 - A novel tomographic scheme for analysing the state of any single membrane electrode assembly (MEA) in a stack is suggested. Plates of very high conductivity placed between every fuel cell and slitted in an appropriate manner cause surface currents at well-defined locations of the stack. We show that knowing these surface currents, information about anomalies of the currents in a MEA can be obtained using the methods of tomography. The results are mathematically not unique. However, when assuming plausible defect structures, one can exclude improbable deficiencies by applying a special form of simulated annealing. We present numerical calculations of typical examples demonstrating that the essential defects of the MEA in any single cell of the stack can be detected and their extent can be determined. Y1 - 2010 U6 - https://doi.org/10.1002/er.1634 SN - 0363-907X VL - 34 IS - 3 SP - 284 EP - 292 PB - Wiley CY - London ER - TY - JOUR A1 - Fredebeul-Krein, Markus T1 - Studiengebühren sind sozial gerecht JF - INSM-Ökonomenblog Y1 - 2010 PB - INSM CY - Berlin ER - TY - JOUR A1 - Frings, Michael T1 - Das neue Recht der Zahlungsdienste JF - NWB Steuer- und Wirtschaftsrecht Y1 - 2010 SN - 0028-3460 SP - 1151 EP - 1159 PB - NWB-Verlag CY - Herne ER - TY - JOUR A1 - Frings, Michael T1 - Das neue Recht des Verbraucherkredits JF - NWB Steuer- und Wirtschaftsrecht Y1 - 2010 SN - 0028-3460 IS - 20 SP - 1608 EP - 1617 PB - NWB-Verlag CY - Herne ER - TY - JOUR A1 - Balakrishnan, Karthikeyan A1 - Andrei-Selmer, Luminita-Cornelia A1 - Selmer, Thorsten A1 - Bacher, Michael A1 - Dodel, Richard T1 - Comparison of intravenous immunoglobulins for naturally occurring autoantibodies against amyloid-β JF - Journal of Alzheimer's Disease N2 - Intravenous immunoglobulins (IVIG) are currently used for therapeutic purposes in autoimmune disorders. Recently, we demonstrated the presence of naturally occurring antibodies against amyloid- β (nAbs-Aβ) within the pool of IVIG. In this study, we compared different brands of IVIG for nAbs-Aβ and have found differences in the specificity of the nAbs-Aβ towards Aβ1–40 and Aβ1–42 . We analyzed the influence of a pH-shift over the course of antibody storage using ELISA and investigated antibody dimerization at acidic and neutral pH as well as differences in the IgG subclass distributions among the IVIG using both HPLC and a nephelometric assay. Furthermore, we investigated the epitope region of purified nAbs-Aβ. The differences found in Aβ specificity are not directly proportionate to the binding nature of these antibodies when administered in vivo. This information, however, may serve as a guide when choosing the commercial source of IVIG for therapeutic applications in Alzheimer's disease Y1 - 2010 U6 - https://doi.org/10.3233/JAD-2010-1353 SN - 1387-2877 VL - 20 IS - 1 SP - 135 EP - 143 PB - IOS Press CY - Amsterdam ER - TY - JOUR A1 - Alexopoulos, Spiros A1 - Hoffschmidt, Bernhard T1 - Solar tower power plant in Germany and future perspectives of the development of the technology in Greece and Cyprus JF - Renewable Energy N2 - Since the 80s power production with solar thermal power plants has been a way to substitute fossil fuels. By concentrating direct solar radiation from heliostats very high temperatures of a thermal fluid can be reached. The resulting heat is converted to mechanical energy in a steam cycle which generates electricity. High efficiencies and fast start-up are reached by using air as a heat medium, as well as using porous ceramic materials as solar receiver of the concentrated sunlight. In Germany the construction of a 1.5 MWe solar tower power plant began in 2008. It is operational since December 2008 and started production of electricity in the spring of 2009. In Greece and Cyprus, countries with high solar potential, the development of this competitive solar thermal technology is imperative, since it has already been implemented in other Mediterranean countries. Y1 - 2010 U6 - https://doi.org/10.1016/j.renene.2009.11.003 SN - 0960-1481 VL - 35 IS - 7 SP - 1352 EP - 1356 PB - Elsevier CY - Amsterdam ER -