@article{MuellerHirschfeldLambertzetal.2014,
  author    = {M{\"u}ller, Martin and Hirschfeld, Julian and Lambertz, Rita and Schulze Lohoff, Andreas and Lustfeld, Hans and Pfeifer, Heinz and Reißel, Martin},
  title     = {Validation of a novel method for detecting and stabilizing malfunctioning areas in fuel cell stacks},
  series = {Journal of power sources},
  volume    = {272},
  journal   = {Journal of power sources},
  publisher = {Elsevier},
  address   = {Amsterdam},
  issn      = {1873-2755 (E-Journal); 0378-7753 (Print)},
  doi       = {10.1016/j.jpowsour.2014.08.045},
  pages     = {225 -- 232},
  year      = {2014},
  abstract  = {In this paper a setup for detecting malfunctioning areas of MEAs in fuel cell stacks is described. Malfunctioning areas generate electric cross currents inside bipolar plates. To exploit this we suggest bipolar plates consisting not of two but of three layers. The third one is a highly conducting layer and segmented such that the cross currents move along the segments to the surface of the stack where they can be measured by an inductive sensor. With this information a realistic model can be used to detect the malfunctioning area. Furthermore the third layer will prevent any current inhomogeneity of a malfunctioning cell to spread to neighbouring cells in the stack. In this work the results of measurements in a realistic cell setup will be compared with the results obtained in simulation studies with the same configuration. The basis for the comparison is the reliable characterisation of the electrical properties of the cell components and the implication of these results into the simulation model. The experimental studies will also show the limits in the maximum number of segments, which can be used for a reliable detection of cross currents.},
  language  = {en}
}
@article{VogtMottaghyRathetal.2014,
  author    = {Vogt, C. and Mottaghy, Darius and Rath, V. and Marquart, G. and Dijkshoorn, L. and Wolf, A. and Clauser, C.},
  title     = {Vertical variation in heat flow on the Kola Peninsula: palaeoclimate or fluid flow?},
  series = {Geophysical Journal International},
  volume    = {199},
  journal   = {Geophysical Journal International},
  number    = {2},
  publisher = {Oxford University Press},
  address   = {Oxford},
  issn      = {1365-246X},
  doi       = {10.1093/gji/ggu282},
  pages     = {829 -- 843},
  year      = {2014},
  abstract  = {Following earlier studies, we present forward and inverse simulations of heat and fluid transport of the upper crust using a local 3-D model of the Kola area. We provide best estimates for palaeotemperatures and permeabilities, their errors and their dependencies. Our results allow discriminating between the two mentioned processes to a certain extent, partly resolving the non-uniqueness of the problem. We find clear indications for a significant contribution of advective heat transport, which, in turn, imply only slightly lower ground surface temperatures during the last glacial maximum relative to the present value. These findings are consistent with the general background knowledge of (i) the fracture zones and the corresponding fluid movements in the bedrock and (ii) the glacial history of the Kola area.},
  language  = {en}
}
@article{TheysohnKraffEilersetal.2014,
  author    = {Theysohn, Jens M. and Kraff, Oliver and Eilers, Kristina and Andrade, Dorian and Gerwig, Marcus and Timmann, Dagmar and Schmitt, Franz and Ladd, Mark E. and Ladd, Susanne C. and Bitz, Andreas},
  title     = {Vestibular effects of a 7 Tesla MRI examination compared to 1.5 T and 0 T in healthy volunteers},
  series = {PLoS one},
  volume    = {9},
  journal   = {PLoS one},
  number    = {3},
  publisher = {PLOS},
  address   = {San Francisco},
  issn      = {1932-6203},
  doi       = {10.1371/journal.pone.0092104},
  pages     = {e92104},
  year      = {2014},
  abstract  = {Ultra-high-field MRI (7 Tesla (T) and above) elicits more temporary side-effects compared to 1.5 T and 3 T, e.g. dizziness or "postural instability" even after exiting the scanner. The current study aims to assess quantitatively vestibular performance before and after exposure to different MRI scenarios at 7 T, 1.5 T and 0 T. Sway path and body axis rotation (Unterberger's stepping test) were quantitatively recorded in a total of 46 volunteers before, 2 minutes after, and 15 minutes after different exposure scenarios: 7 T head MRI (n = 27), 7 T no RF (n = 22), 7 T only B₀ (n = 20), 7 T in \& out B₀ (n = 20), 1.5 T no RF (n = 20), 0 T (n = 15). All exposure scenarios lasted 30 minutes except for brief one minute exposure in 7 T in \& out B₀. Both measures were documented utilizing a 3D ultrasound system. During sway path evaluation, the experiment was repeated with eyes both open and closed. Sway paths for all long-lasting 7 T scenarios (normal, no RF, only B₀) with eyes closed were significantly prolonged 2 minutes after exiting the scanner, normalizing after 15 minutes. Brief exposure to 7 T B₀ or 30 minutes exposure to 1.5 T or 0 T did not show significant changes. End positions after Unterberger's stepping test were significantly changed counter-clockwise after all 7 T scenarios, including the brief in \& out B₀ exposure. Shorter exposure resulted in a smaller alteration angle. In contrast to sway path, reversal of changes in body axis rotation was incomplete after 15 minutes. 1.5 T caused no rotational changes. The results show that exposure to the 7 Tesla static magnetic field causes only a temporary dysfunction or "over-compensation" of the vestibular system not measurable at 1.5 or 0 Tesla. Radiofrequency fields, gradient switching, and orthostatic dysregulation do not seem to play a role.},
  language  = {en}
}
@inproceedings{AltayButenwegKlinkel2014,
  author    = {Altay, Okyay and Butenweg, Christoph and Klinkel, Sven},
  title     = {Vibration mitigation of wind turbine towers by a new semiactive Tuned Liquid Column Damper},
  series = {6. Word Congress on Structural Control and Monitoring, 15 - 17 July, 2014 Barcelona,Spain},
  booktitle = {6. Word Congress on Structural Control and Monitoring, 15 - 17 July, 2014 Barcelona,Spain},
  year      = {2014},
  language  = {en}
}
@inproceedings{AltayButenwegKlinkeletal.2014,
  author    = {Altay, Okyay and Butenweg, Christoph and Klinkel, Sven and Taddei, Francesca},
  title     = {Vibration mitigation of wind turbine towers by tuned liquid column dampers},
  series = {Proceedings of the 9th European Conference on Structural Dynamics, EURODYN 2014 Porto, Portugal, 30 June - 2 July 2014 / A. Cunha, E. Caetano, .... (eds.)},
  booktitle = {Proceedings of the 9th European Conference on Structural Dynamics, EURODYN 2014 Porto, Portugal, 30 June - 2 July 2014 / A. Cunha, E. Caetano, .... (eds.)},
  address   = {Porto},
  organization    = {European Conference on Structural Dynamics, EURODYN <9, 2014, Porto>},
  isbn      = {978-972-752-165-4},
  pages     = {1531 -- 1538},
  year      = {2014},
  language  = {en}
}
@incollection{AltayTaddeiButenwegetal.2014,
  author    = {Altay, Okyay and Taddei, Francesca and Butenweg, Christoph and Klinkel, Sven},
  title     = {Vibration mitigation of wind turbine towers with tuned mass dampers},
  series = {Wind turbine control and monitoring. (Advances in industrial control)},
  booktitle = {Wind turbine control and monitoring. (Advances in industrial control)},
  publisher = {Springer},
  address   = {Cham ; Heidelberg ; New York ; Dordrecht ; London},
  isbn      = {978-3-319-08412-1 (Print) ; 978-3-319-08413-8 (E-Book)},
  doi       = {10.1007/978-3-319-08413-8_12},
  pages     = {337 -- 373},
  year      = {2014},
  abstract  = {Because of its minor environmental impact, electricity generation using wind power is getting remarkable. The further growth of the wind industry depends on technological solutions to the challenges in production and construction of the turbines. Wind turbine tower vibrations, which limit power generation efficiency and cause fatigue problems with high maintenance costs, count as one of the main structural difficulties in the wind energy sector. To mitigate tower vibrations auxiliary measures are necessary. The effectiveness of tuned mass damper is verified by means of a numeric study on a 5 MW onshore reference wind turbine. Hereby, also seismic-induced vibrations and soil-structure interaction are considered. Acquired results show that tuned mass damper can effectively reduce resonant tower vibrations and improve the fatigue life of wind turbines. This chapter is also concerned with tuned liquid column damper and a semiactive application of it. Due to its geometric versatility and low prime costs, tuned liquid column dampers are a good alternative to other damping measures, in particular for slender structures like wind turbines.},
  language  = {en}
}
@article{FredebeulKreinSteingroever2014,
  author    = {Fredebeul-Krein, Markus and Steingr{\"o}ver, Markus},
  title     = {Wholesale broadband access to IPTV in an NGA environment : how to deal with it from a regulatory perspective?},
  series = {Telecommunications Policy},
  volume    = {38},
  journal   = {Telecommunications Policy},
  number    = {3},
  publisher = {Elsevier},
  address   = {Amsterdam},
  issn      = {0308-5961 (Print)},
  doi       = {doi:10.1016/j.telpol.2013.04.002},
  pages     = {264 -- 277},
  year      = {2014},
  language  = {en}
}
@article{EilmannSterckWegneretal.2014,
  author    = {Eilmann, Britta and Sterck, Frank J. and Wegner, L. and de Vries, Sven M. G. and von Arx, G. and Mohren, Godefridus M. J. and den Ouden, Jan and Sass-Klaassen, Ute G. W.},
  title     = {Wood structural differences between northern and southern beech provenances growing at a moderate site},
  series = {Tree Physiology},
  volume    = {34},
  journal   = {Tree Physiology},
  number    = {8},
  publisher = {Oxford University Press},
  address   = {Oxford},
  issn      = {1758-4469 (Online)},
  doi       = {10.1093/treephys/tpu069},
  pages     = {882 -- 893},
  year      = {2014},
  language  = {en}
}
@article{HoehrPaulssenBenardetal.2014,
  author    = {Hoehr, Cornelia and Paulßen, Elisabeth and Benard, Francois and Lee, Chris Jaeil and Hou, Xinchi and Badesso, Brian and Ferguson, Simon and Miao, Qing and Yang, Hua and Buckley, Ken and Hanemaayer, Victoire and Zeisler, Stefan and Ruth, Thomas and Celler, Anna and Schaffer, Paul},
  title     = {⁴⁴ᶢSc production using a water target on a 13 MeV cyclotron},
  series = {Nuclear medicine and biology},
  volume    = {41},
  journal   = {Nuclear medicine and biology},
  number    = {5},
  publisher = {Elsevier},
  address   = {Amsterdam},
  issn      = {1872-9614},
  doi       = {10.1016/j.nucmedbio.2013.12.016},
  pages     = {401 -- 406},
  year      = {2014},
  abstract  = {Access to promising radiometals as isotopes for novel molecular imaging agents requires that they are routinely available and inexpensive to obtain. Proximity to a cyclotron center outfitted with solid target hardware, or to an isotope generator for the metal of interest is necessary, both of which can introduce significant hurdles in development of less common isotopes. Herein, we describe the production of ⁴⁴Sc (t₁⸝₂ = 3.97 h, Eavg,β⁺ = 1.47 MeV, branching ratio = 94.27\%) in a solution target and an automated loading system which allows a quick turn-around between different radiometallic isotopes and therefore greatly improves their availability for tracer development. Experimental yields are compared to theoretical calculations.},
  language  = {en}
}