TY - JOUR A1 - Fabo, Sabine ED - Mohr, Klaus T1 - Sisyphus wird Steiff JF - Prädikat spießig (Boxhorn ; 21) N2 - Eine Reise durch die fremde Welt eines Kaufhaus-Schaufensters. Plüschtiere mit eingebauter Bewegungstechnik - knuffig oder nur eine Ausformulierung des Ernst des Lebens? Y1 - 2010 SN - 1864-2535 VL - 2010 SP - 58 EP - 61 PB - FH Aachen, Fachbereich Gestaltung CY - Aachen ER - TY - JOUR A1 - Göttsche, Joachim A1 - Hoffschmidt, Bernhard A1 - Schmitz, Stefan A1 - Sauerborn, Markus T1 - Solar Concentrating Systems Using Small Mirror Arrays JF - Journal of solar energy engineering N2 - The cost of solar tower power plants is dominated by the heliostat field making up roughly 50% of investment costs. Classical heliostat design is dominated by mirrors brought into position by steel structures and drives that guarantee high accuracies under wind loads and thermal stress situations. A large fraction of costs is caused by the stiffness requirements of the steel structure, typically resulting in ~ 20 kg/m² steel per mirror area. The typical cost figure of heliostats (figure mentioned by Solucar at Solar Paces Conference, Seville, 2006) is currently in the area of 150 €/m² caused by the increasing price of the necessary raw materials. An interesting option to reduce costs lies in a heliostat design where all moving parts are protected from wind loads. In this way, drives and mechanical layout may be kept less robust, thereby reducing material input and costs. In order to keep the heliostat at an appropriate size, small mirrors (around 10x10 cm²) have to be used, which are placed in a box with a transparent cover. Innovative drive systems are developed in order to obtain a cost-effective design. A 0,5x0,5 m² demonstration unit will be constructed. Tests of the unit are carried out with a high-precision artificial sun unit that imitates the sun’s path with an accuracy of less than 0.5 mrad and creates a beam of parallel light with a divergence of less than 4 mrad. Y1 - 2010 U6 - https://doi.org/10.1115/1.4000332 SN - 0199-6231 SN - 1528-8986 (eISSN) VL - 132 IS - 1 PB - ASME CY - New York ER - TY - CHAP A1 - Dachwald, Bernd T1 - Solar sail dynamics and control T2 - Encyclopedia of Aerospace Engineering N2 - Solar sails are large and lightweight reflective structures that are propelled by solar radiation pressure. This chapter covers their orbital and attitude dynamics and control. First, the advantages and limitations of solar sails are discussed and their history and development status is outlined. Because the dynamics of solar sails is governed by the (thermo-)optical properties of the sail film, the basic solar radiation pressure force models have to be described and compared before parameters to measure solar sail performance can be defined. The next part covers the orbital dynamics of solar sails for heliocentric motion, planetocentric motion, and motion at Lagrangian equilibrium points. Afterwards, some advanced solar radiation pressure force models are described, which allow to quantify the thrust force on solar sails of arbitrary shape, the effects of temperature, of light incidence angle, of surface roughness, and the effects of optical degradation of the sail film in the space environment. The orbital motion of a solar sail is strongly coupled to its rotational motion, so that the attitude control of these soft and flexible structures is very challenging, especially for planetocentric orbits that require fast attitude maneuvers. Finally, some potential attitude control methods are sketched and selection criteria are given. KW - solar sail KW - sailcraft KW - orbital dynamics KW - orbit control KW - attitude dynamics Y1 - 2010 U6 - https://doi.org/10.1002/9780470686652.eae292 PB - Wiley CY - Hoboken 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 . 35 (2010), H. 7 Y1 - 2010 SN - 0960-1481 SP - 1352 EP - 1356 ER - TY - CHAP A1 - Anthrakidis, Anette T1 - Solare-Prozesswärme-Standards (Sol-Pro-St) T2 - Thermische Solarenergie : 20. Symposium ; 05. bis 07. Mai 2010, Kloster Banz, Bad Staffelstein Y1 - 2010 SN - 978-3-941785-29-8 SP - 182 EP - 187 PB - OTTI CY - Regensburg ER - TY - JOUR A1 - Alexopoulos, Spiros A1 - Hoffschmidt, Bernhard T1 - Solarthermische Kraftwerke mit thermischen Speichern JF - Chemie Ingenieur Technik Y1 - 2010 SN - 1522-2640 U6 - https://doi.org/10.1002/cite.201050678 N1 - Special Issue: ProcessNet-Jahrestagung 2010 und 28. Jahrestagung der Biotechnologen VL - 82 IS - 9 SP - 1606 PB - Wiley-VCH CY - Weinheim ER - TY - JOUR A1 - Fredebeul-Krein, Markus T1 - Sollen die Studiengebühren wieder abgeschafft werden? JF - Bildungsgerechtigkeit in der Begabtenförderung : ein Widerspruch in sich? ; 1. Aufl. / Bartoldus, Beate [Hrsg.] Y1 - 2010 SN - 978-3-86872-423-3 PB - Friedrich-Ebert-Stiftung CY - Berlin ER - TY - CHAP A1 - Goldbach, Daniel A1 - Ament, Christoph ED - Scharff, Peter T1 - Stabilized reversing with vehicle trailer combinations T2 - Crossing borders within the ABC : automation, biomedical engineering and computer science; proceedings; 55. IWK Internationales Wissenschaftliches Kolloquium; 13 - 17 September 2010, Ilmenau Y1 - 2010 SN - 978-3-938843-53-6 SP - 352 EP - 357 PB - Verl. ISLE CY - Ilmenau ER - TY - JOUR A1 - Horstmann, Marie-Therese A1 - Bialonski, Stephan A1 - Noenning, Nina A1 - Mai, Heinke A1 - Prusseit, Jens A1 - Wellmer, Jörg A1 - Hinrichs, Hermann A1 - Lehnertz, Klaus T1 - State dependent properties of epileptic brain networks: Comparative graph–theoretical analyses of simultaneously recorded EEG and MEG JF - Clinical Neurophysiology N2 - Objective To investigate whether functional brain networks of epilepsy patients treated with antiepileptic medication differ from networks of healthy controls even during the seizure-free interval. Methods We applied different rules to construct binary and weighted networks from EEG and MEG data recorded under a resting-state eyes-open and eyes-closed condition from 21 epilepsy patients and 23 healthy controls. The average shortest path length and the clustering coefficient served as global statistical network characteristics. Results Independent on the behavioral condition, epileptic brains exhibited a more regular functional network structure. Similarly, the eyes-closed condition was characterized by a more regular functional network structure in both groups. The amount of network reorganization due to behavioral state changes was similar in both groups. Consistent findings could be achieved for networks derived from EEG but hardly from MEG recordings, and network construction rules had a rather strong impact on our findings. Conclusions Despite the locality of the investigated processes epileptic brain networks differ in their global characteristics from non-epileptic brain networks. Further methodological developments are necessary to improve the characterization of disturbed and normal functional networks. Significance An increased regularity and a diminished modulation capability appear characteristic of epileptic brain networks. Y1 - 2010 U6 - https://doi.org/10.1016/j.clinph.2009.10.013 SN - 1388-2457 VL - 121 IS - 2 SP - 172 EP - 185 PB - Elsevier CY - Amsterdam ER - TY - CHAP A1 - Kapoor, Hrshi A1 - Boller, Christian A1 - Giljohann, Sebastian A1 - Braun, Carsten T1 - Strategies for structural health monitoring implementation potential assessment in aircraft operational life extension considerations T2 - 2nd International Symposium on NDT in Aerospace : November 22-24, 2010 Hamburg, Germany Y1 - 2010 SN - 978-3-940283-28-3 PB - Dt. Gesellschaft für Zerstörungsfreie Prüfung CY - Berlin ER - TY - THES A1 - Kowalski, Julia T1 - Streamline estimation from sparsely sampled q-space Magnetic Resonance data Y1 - 2010 N1 - Master Thesis in Medical Physics, ETH Zurich ER - TY - JOUR A1 - Pressler, Axel A1 - Esefeld, Katrin A1 - Scherr, Johannes A1 - Ali, Mohammad A1 - Hanssen, Henner A1 - Kotliar, Konstantin A1 - Lanzl, Ines A1 - Halle, Martin A1 - Kaemmerer, Harald A1 - Schmidt-Trucksäss, Arno A1 - Hager, Alfred T1 - Structural alterations of retinal arterioles in adults late after repair of aortic isthmic coarctation JF - The American Journal of Cardiology N2 - Patients after coarctation repair still have an increased risk of cardiovascular or cerebrovascular events. This has been explained by the persisting hypertension and alterations in the peripheral vessels. However, involvement of the central vessels such as the retinal arteries is virtually unknown. A total of 34 patients after coarctation repair (22 men and 12 women; 23 to 58 years old, age range 0 to 32 years at surgical repair) and 34 nonhypertensive controls underwent structural and functional retinal vessel analysis. Using structural analysis, the vessel diameters were measured. Using functional analysis, the endothelium-dependent vessel dilation in response to flicker light stimulation was assessed. In the patients after coarctation repair, the retinal arteriolar diameter was significantly reduced compared to that of the controls (median 182 μm, first to third quartile 171 to 197; vs 197 μm, first to third quartile 193 to 206; p <0.001). These findings were independent of the peripheral blood pressure and age at intervention. No differences were found for venules. The functional analysis findings were not different between the patients and controls (maximum dilation 3.5%, first to third quartile 2.1% to 4.5% vs 3.6%, first to third quartile 2.2% to 4.3%; p = 0.81), indicating preserved autoregulative mechanisms. In conclusion, the retinal artery diameter is reduced in patients after coarctation repair, independent of their current blood pressure level and age at intervention. As a structural marker of chronic vessel damage associated with past, current, or future hypertension, retinal arteriolar narrowing has been linked to stroke incidence. These results indicate an involvement of cerebral microcirculation in aortic coarctation, despite timely repair, and might contribute to explain the increased rate of cerebrovascular events in such patients. Y1 - 2010 U6 - https://doi.org/10.1016/j.amjcard.2009.10.070 SN - 0002-9149 VL - 105 IS - 5 SP - 740 EP - 744 PB - Elsevier CY - Amsterdam ER - TY - BOOK A1 - Hoffschmidt, Bernhard A1 - Lan, Marco A1 - Fricke, Barbara A1 - Anthrakidis, Anette A1 - Peter, Stefan T1 - Struktur und Dynamik einer Stromversorgung mit einem hohen Anteil erneuerbarer Energieerzeuger. Kurzbezeichnung: Energiestudie. Schlussbericht Y1 - 2010 N1 - BMU-Forschungsbericht. Bundesministerium für Umwelt, Naturschutz und Reaktorsicherheit / 2010 / 20110602205 PB - Solar-Institut, FH Aachen CY - Jülich ER - TY - JOUR A1 - Fredebeul-Krein, Markus T1 - Studiengebühren sind sozial gerecht JF - ÖkonomenBlog : Die Stimme der Ökonomischen Vernunft (2010) Y1 - 2010 N1 - [gesehen: 24.09.2010] ER - TY - JOUR A1 - Fonti, Patrick A1 - von Arx, Georg A1 - García-González, Ignacio A1 - Eilmann, Britta A1 - Sass-Klaassen, Ute G. W. A1 - Gärtner, Holger A1 - Eckstein, Dieter T1 - Studying global change through investigation of the plastic responses of xylem anatomy in tree rings JF - New Phytologist N2 - Variability in xylem anatomy is of interest to plant scientists because of the role water transport plays in plant performance and survival. Insights into plant adjustments to changing environmental conditions have mainly been obtained through structural and functional comparative studies between taxa or within taxa on contrasting sites or along environmental gradients. Yet, a gap exists regarding the study of hydraulic adjustments in response to environmental changes over the lifetimes of plants. In trees, dated tree-ring series are often exploited to reconstruct dynamics in ecological conditions, and recent work in which wood-anatomical variables have been used in dendrochronology has produced promising results. Environmental signals identified in water-conducting cells carry novel information reflecting changes in regional conditions and are mostly related to short, sub-annual intervals. Although the idea of investigating environmental signals through wood anatomical time series goes back to the 1960s, it is only recently that low-cost computerized image-analysis systems have enabled increased scientific output in this field. We believe that the study of tree-ring anatomy is emerging as a promising approach in tree biology and climate change research, particularly if complemented by physiological and ecological studies. This contribution presents the rationale, the potential, and the methodological challenges of this innovative approach. Y1 - 2010 U6 - https://doi.org/10.1111/j.1469-8137.2009.03030.x SN - 1469-8137 (Online) SN - 0028-646X (Print) VL - 185 IS - 1 SP - 42 EP - 53 PB - Wiley-Blackwell CY - Oxford ER - TY - JOUR A1 - Paulßen, Elisabeth A1 - Alberto, Roger A1 - Abram, Ulrich T1 - Synthesis, Characterization, and Structures of R3EOTcO3 Complexes (E = C, Si, Ge, Sn, Pb) and Related Compounds JF - Inorganic Chemistry N2 - AgTcO4 reacts with R3ECl compounds (E = C, Si, Ge, Sn, Pb; R = Me, iPr, tBu, Ph), tBu2SnCl2, or PhMgCl under formation of novel trioxotechnetium(VII) derivatives. The carbon and silicon derivatives readily undergo decomposition, which was proven by 99Tc NMR spectroscopy and the isolation of decomposition products such as [TcOCl3(THF)(OH2)]. Compounds [Ph3GeOTcO3], [(THF)Ph3SnOTcO3], [(O3TcO)SntBu2(OH)]2, and [(THF)4Mg(OTcO3)2] are more stable and were isolated in crystalline form and characterized by X-ray diffraction. Y1 - 2010 U6 - https://doi.org/10.1021/ic1001094 SN - 1520-510X VL - 49 IS - 7 SP - 3525 EP - 3530 PB - American Chemical Society CY - Washington ER - TY - JOUR A1 - Ferrein, Alexander A1 - Niemüller, Tim A1 - Steinbauer, Gerald T1 - Team Zadeat 2010 : application for participation Y1 - 2010 ER - TY - JOUR A1 - Geimer, Konstantin A1 - Sauerborn, Markus A1 - Hoffschmidt, Bernhard A1 - Schmitz, Mark A1 - Göttsche, Joachim T1 - Test facility for absorber specimens of solar tower power plants JF - Advances in Science and Technology N2 - The Solar-Institute Jülich (SIJ) has initiated the construction of the first and only German solar tower power plant and is now involved in the accompanying research. The power plant for experimental and demonstration purposes in the town of Jülich started supplying electric energy in the beginning of 2008. The central receiver plant features as central innovation an open volumetric receiver, consisting of porous ceramic elements that simultaneously absorb the concentrated sunlight and transfer the heat to ambient air passing through the pores so that an average temperature of 680°C is reached. The subsequent steam cycle generates up to 1.5 MWe. A main field of research at the SIJ is the optimization of the absorber structures. To analyze the capability of new absorber specimens a special test facility was developed and set up in the laboratory. A high-performance near-infrared radiator offers for single test samples a variable and repeatable beam with a power of up to 320 kW/m² peak. The temperatures achieved on the absorber surface can reach more than 1000°C. To suck ambient air through the open absorber - like on the tower - it is mounted on a special blower system. An overview about the test facility and some recent results will be presented. Y1 - 2010 U6 - https://doi.org/10.4028/www.scientific.net/AST.74.266 N1 - 5th Forum on New Materials : CIMTEC 2010, Montecatini Terme, Italy 13-18 June 2010. Part C VL - 74 SP - 266 EP - 271 PB - Trans Tech Publications CY - Baech ER - TY - JOUR A1 - Bragard, Michael A1 - Soltau, N. A1 - Thomas, S. A1 - De Doncker, R. W. T1 - The balance of renewable sources and user demands in grids : power electronics for modular battery energy storage systems JF - IEEE transactions on power electronics N2 - The continuously growing amount of renewable sources starts compromising the stability of electrical grids. Contradictory to fossil fuel power plants, energy production of wind and photovoltaic (PV) energy is fluctuating. Although predictions have significantly improved, an outage of multi-MW offshore wind farms poses a challenging problem. One solution could be the integration of storage systems in the grid. After a short overview, this paper focuses on two exemplary battery storage systems, including the required power electronics. The grid integration, as well as the optimal usage of volatile energy reserves, is presented for a 5- kW PV system for home application, as well as for a 100- MW medium-voltage system, intended for wind farm usage. The efficiency and cost of topologies are investigated as a key parameter for large-scale integration of renewable power at medium- and low-voltage. Y1 - 2010 U6 - https://doi.org/10.1109/TPEL.2010.2085455 SN - 0885-8993 VL - 25 IS - 12 SP - 3049 EP - 3056 PB - IEEE CY - New York ER - TY - JOUR A1 - Herzog, Hans A1 - Pietrzyk, Uwe A1 - Shah, N. Jon A1 - Ziemons, Karl T1 - The current state, challenges and perspectives of MR-PET JF - Neuroimage N2 - Following the success of PET/CT during the last decade and the recent increasing proliferation of SPECT/CT, another hybrid imaging instrument has been gaining more and more interest: MR-PET. First combined, simultaneous PET and MR studies carried out in small animals demonstrated the feasibility of the new approach. Concurrently, some prototypes of an MR-PET scanner for simultaneous human brain studies have been built, their performance is being tested and preliminary applications have already been shown. Through this pioneering work, it has become clear that advances in the detector design are necessary for further optimization. Recently, the different issues related to the present state and future prospects of MR-PET were presented and discussed during an international 2-day workshop at the Forschungszentrum Jülich, Germany, held after, and in conjunction with, the 2008 IEEE Nuclear Science Symposium and Medical Imaging Conference in Dresden, Germany on October 27–28, 2008. The topics ranged from small animal MR-PET imaging to human MR-BrainPET imaging, new detector developments, challenges/opportunities for ultra-high field MR-PET imaging and considerations of possible future research and clinical applications. This report presents a critical summary of the contributions made to the workshop. Y1 - 2010 U6 - https://doi.org/10.1016/j.neuroimage.2009.10.036 SN - 1053-8119 VL - 49 IS - 3 SP - 2072 EP - 2082 PB - Elsevier CY - Amsterdam ER -