@phdthesis{Pufahl2018,
  author    = {Pufahl, Luise},
  title     = {Modeling and executing batch activities in business processes},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-408013},
  school      = {Universit{\"a}t Potsdam},
  pages     = {xix, 163},
  year      = {2018},
  abstract  = {Business process automation improves organizations' efficiency to perform work. Therefore, a business process is first documented as a process model which then serves as blueprint for a number of process instances representing the execution of specific business cases. In existing business process management systems, process instances run independently from each other. However, in practice, instances are also collected in groups at certain process activities for a combined execution to improve the process performance. Currently, this so-called batch processing is executed manually or supported by external software. Only few research proposals exist to explicitly represent and execute batch processing needs in business process models. These works also lack a comprehensive understanding of requirements. This thesis addresses the described issues by providing a basic concept, called batch activity. It allows an explicit representation of batch processing configurations in process models and provides a corresponding execution semantics, thereby easing automation. The batch activity groups different process instances based on their data context and can synchronize their execution over one or as well multiple process activities. The concept is conceived based on a requirements analysis considering existing literature on batch processing from different domains and industry examples. Further, this thesis provides two extensions: First, a flexible batch configuration concept, based on event processing techniques, is introduced to allow run time adaptations of batch configurations. Second, a concept for collecting and batching activity instances of multiple different process models is given. Thereby, the batch configuration is centrally defined, independently of the process models, which is especially beneficial for organizations with large process model collections. This thesis provides a technical evaluation as well as a validation of the presented concepts. A prototypical implementation in an existing open-source BPMS shows that with a few extensions, batch processing is enabled. Further, it demonstrates that the consolidated view of several work items in one user form can improve work efficiency. The validation, in which the batch activity concept is applied to different use cases in a simulated environment, implies cost-savings for business processes when a suitable batch configuration is used. For the validation, an extensible business process simulator was developed. It enables process designers to study the influence of a batch activity in a process with regards to its performance.},
  language  = {en}
}
@book{GayvoronskayaMeinelSchnjakin2018,
  author    = {Gayvoronskaya, Tatiana and Meinel, Christoph and Schnjakin, Maxim},
  title     = {Blockchain},
  number    = {113},
  publisher = {Universit{\"a}tsverlag Potsdam},
  address   = {Potsdam},
  isbn      = {978-3-86956-394-7},
  issn      = {1613-5652},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-103141},
  publisher      = {Universit{\"a}t Potsdam},
  pages     = {109},
  year      = {2018},
  abstract  = {Der Begriff Blockchain ist in letzter Zeit zu einem Schlagwort geworden, aber nur wenige wissen, was sich genau dahinter verbirgt. Laut einer Umfrage, die im ersten Quartal 2017 ver{\"o}ffentlicht wurde, ist der Begriff nur bei 35 Prozent der deutschen Mittelst{\"a}ndler bekannt. Dabei ist die Blockchain-Technologie durch ihre rasante Entwicklung und die globale Eroberung unterschiedlicher M{\"a}rkte f{\"u}r Massenmedien sehr interessant. So sehen viele die Blockchain-Technologie entweder als eine Allzweckwaffe, zu der aber nur wenige einen Zugang haben, oder als eine Hacker-Technologie f{\"u}r geheime Gesch{\"a}fte im Darknet. Dabei liegt die Innovation der Blockchain-Technologie in ihrer erfolgreichen Zusammensetzung bereits vorhandener Ans{\"a}tze: dezentrale Netzwerke, Kryptographie, Konsensfindungsmodelle. Durch das innovative Konzept wird ein Werte-Austausch in einem dezentralen System m{\"o}glich. Dabei wird kein Vertrauen zwischen dessen Knoten (z.B. Nutzer) vorausgesetzt. Mit dieser Studie m{\"o}chte das Hasso-Plattner-Institut den Lesern helfen, ihren eigenen Standpunkt zur Blockchain-Technologie zu finden und dabei dazwischen unterscheiden zu k{\"o}nnen, welche Eigenschaften wirklich innovativ und welche nichts weiter als ein Hype sind. Die Autoren der vorliegenden Arbeit analysieren positive und negative Eigenschaften, welche die Blockchain-Architektur pr{\"a}gen, und stellen m{\"o}gliche Anpassungs- und L{\"o}sungsvorschl{\"a}ge vor, die zu einem effizienten Einsatz der Technologie beitragen k{\"o}nnen. Jedem Unternehmen, bevor es sich f{\"u}r diese Technologie entscheidet, wird dabei empfohlen, f{\"u}r den geplanten Anwendungszweck zun{\"a}chst ein klares Ziel zu definieren, das mit einem angemessenen Kosten-Nutzen-Verh{\"a}ltnis angestrebt werden kann. Dabei sind sowohl die M{\"o}glichkeiten als auch die Grenzen der Blockchain-Technologie zu beachten. Die relevanten Schritte, die es in diesem Zusammenhang zu beachten gilt, fasst die Studie f{\"u}r die Leser {\"u}bersichtlich zusammen. Es wird ebenso auf akute Fragestellungen wie Skalierbarkeit der Blockchain, geeigneter Konsensalgorithmus und Sicherheit eingegangen, darunter verschiedene Arten m{\"o}glicher Angriffe und die entsprechenden Gegenmaßnahmen zu deren Abwehr. Neue Blockchains etwa laufen Gefahr, geringere Sicherheit zu bieten, da {\"A}nderungen an der bereits bestehenden Technologie zu Schutzl{\"u}cken und M{\"a}ngeln f{\"u}hren k{\"o}nnen. Nach Diskussion der innovativen Eigenschaften und Probleme der Blockchain-Technologie wird auf ihre Umsetzung eingegangen. Interessierten Unternehmen stehen viele Umsetzungsm{\"o}glichkeiten zur Verf{\"u}gung. Die zahlreichen Anwendungen haben entweder eine eigene Blockchain als Grundlage oder nutzen bereits bestehende und weitverbreitete Blockchain-Systeme. Zahlreiche Konsortien und Projekte bieten „Blockchain-as-a-Service" an und unterst{\"u}tzen andere Unternehmen beim Entwickeln, Testen und Bereitstellen von Anwendungen. Die Studie gibt einen detaillierten {\"U}berblick {\"u}ber zahlreiche relevante Einsatzbereiche und Projekte im Bereich der Blockchain-Technologie. Dadurch, dass sie noch relativ jung ist und sich schnell entwickelt, fehlen ihr noch einheitliche Standards, die Zusammenarbeit der verschiedenen Systeme erlauben und an die sich alle Entwickler halten k{\"o}nnen. Aktuell orientieren sich Entwickler an Bitcoin-, Ethereum- und Hyperledger-Systeme, diese dienen als Grundlage f{\"u}r viele weitere Blockchain-Anwendungen. Ziel ist, den Lesern einen klaren und umfassenden {\"U}berblick {\"u}ber die Blockchain-Technologie und deren M{\"o}glichkeiten zu vermitteln.},
  language  = {de}
}
@misc{MarksMuschHaussigetal.2018,
  author    = {Marks, Richard G. and Musch, Sebastian and Haußig, Hans-Michael and Weiss, Aleš and Albeck-Gidron, Rachel and Sigalow, Emily and Ariel, Yaakov S. and Niculescu, Mira and Landau, David and Rageth, Nina and Ichikawa, Hiroshi and Rohland, Eva and Czendze, Oskar and Reich, Tamar Chana and Schulz, Michael Karl and Arnold, Rafael D. and Anderl, Gabriele and Gempp-Friedrich, Tilmann and Liu, Yongqiang and Battenberg, J. Friedrich and Reichert, Carmen and Riemer, Nathanael and Krah, Markus and Thulin, Mirjam},
  title     = {PaRDeS : Zeitschrift der Vereinigung f{\"u}r J{\"u}dische Studien = JewBus, Jewish Hindus \& other Jewish Encounters with East Asian Religions},
  series = {PaRDeS},
  journal   = {PaRDeS},
  number    = {23},
  editor    = {Riemer, Nathanael and Albeck-Gidron, Rachel and Krah, Markus},
  publisher = {Universit{\"a}tsverlag Potsdam},
  address   = {Potsdam},
  isbn      = {978-3-86956-418-0},
  issn      = {1614-6492},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-402536},
  year      = {2018},
  abstract  = {PaRDeS. Zeitschrift der Vereinigung f{\"u}r J{\"u}dische Studien e.V., m{\"o}chte die fruchtbare und facettenreiche Kultur des Judentums sowie seine Ber{\"u}hrungspunkte zur Umwelt in den unterschiedlichen Bereichen dokumentieren. Daneben dient die Zeitschrift als Forum zur Positionierung der F{\"a}cher J{\"u}dische Studien und Judaistik innerhalb des wissenschaftlichen Diskurses sowie zur Diskussion ihrer historischen und gesellschaftlichen Verantwortung.},
  language  = {de}
}
@book{KellerRotherBartkowiaketal.2018,
  author    = {Keller, Henry and Rother, Philipp and Bartkowiak, Michael and Rauch, Sebastian and Zehl, Rebecca and Ballentin, Josefine and K{\"a}hler, Claudia and Appelt, Franziska and Kochan, Robert and Pfitzner, Tom and Rogge, Lisa and Kurth, Anne-Kathrin and Hiller, Chris},
  title     = {Geographien des Fußballs},
  editor    = {Wilhelm, Jan Lorenz},
  publisher = {Universit{\"a}tsverlag Potsdam},
  address   = {Potsdam},
  isbn      = {978-3-86956-416-6},
  issn      = {2194-1599},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-401497},
  publisher      = {Universit{\"a}t Potsdam},
  pages     = {231},
  year      = {2018},
  abstract  = {In Deutschland erscheint Fußball als omnipr{\"a}sent: Fußballprofis gelten als Vorbilder und Werbetr{\"a}ger, Fußballvereine fungieren als regionale und teilweise als globale Wirtschaftsunternehmen, Fußballspiele als gesellschaftliche Ereignisse und Fußballmannschaften - sowohl auf regionaler als auch auf nationaler Ebene - als identit{\"a}tsstiftend. Unbestritten weist das Ph{\"a}nomen Fußball eine große Gesellschaftsrelevanz auf, und so verwundert es nicht, dass es als Gegenstand wissenschaftlicher und eben auch geographischer Abhandlungen fungiert. Der vorliegende Band richtet sich nun an Geographiestudenten und Fußballinteressierte, die sich verwundert fragen m{\"o}gen, was Geographien des Fußballs bedeuten k{\"o}nnte. Der Band veranschaulicht exemplarisch, was geographische Perspektiven auf den Forschungsgegenstand Fußball auszeichnen und welche Themenfelder und Fragestellungen sich f{\"u}r eine Erforschung anbieten. Dabei reicht das in diesem Band vorgestellte Themenspektrum von raumbezogenen Sprachcodierungen in Spielanalysen {\"u}ber Stadionatmosph{\"a}re und Fanidentit{\"a}ten bis hin zu medial erzeugten Unsicherheitsr{\"a}umen.},
  language  = {de}
}
@phdthesis{Zhang2018,
  author    = {Zhang, Quanchao},
  title     = {Shape-memory properties of polymeric micro-scale objects prepared by electrospinning and electrospraying},
  school      = {Universit{\"a}t Potsdam},
  pages     = {xvi, 53},
  year      = {2018},
  abstract  = {The ongoing trend of miniaturizing multifunctional devices, especially for minimally-invasive medical or sensor applications demands new strategies for designing the required functional polymeric micro-components or micro-devices. Here, polymers, which are capable of active movement, when an external stimulus is applied (e.g. shape-memory polymers), are intensively discussed as promising material candidates for realization of multifunctional micro-components. In this context further research activities are needed to gain a better knowledge about the underlying working principles for functionalization of polymeric micro-scale objects with a shape-memory effect. First reports about electrospun solid microfiber scaffolds, demonstrated a much more pronounced shape-memory effect than their bulk counterparts, indicating the high potential of electrospun micro-objects. Based on these initial findings this thesis was aimed at exploring whether the alteration of the geometry of micro-scale electrospun polymeric objects can serve as suitable parameter to tailor their shape-memory properties. The central hypothesis was that different geometries should result in different degrees of macromolecular chain orientation in the polymeric micro-scale objects, which will influence their mechanical properties as well as thermally-induced shape-memory function. As electrospun micro-scale objects, microfiber scaffolds composed of hollow microfibers with different wall thickness and electrosprayed microparticles as well as their magneto-sensitive nanocomposites all prepared from the same polymer exhibiting pronounced bulk shape-memory properties were investigated. For this work a thermoplastic multiblock copolymer, named PDC, with excellent bulk shape-memory properties, associated with crystallizable oligo(ε-caprolactone) (OCL) switching domains, was chosen for the preparation of electrospun micro-scale objects, while crystallizable oligo(p-dioxanone) (OPDO) segments serve as hard domains in PDC. In the first part of the thesis microfiber scaffolds with different microfiber geometries (solid or hollow with different wall thickness) were discussed. Hollow microfiber based PDC scaffolds were prepared by coaxial electrospinning from a 1, 1, 1, 3, 3, 3 hexafluoro-2-propanol (HFP) solution with a polymer concentration of 13\% w·v-1. Here as a first step core-shell fiber scaffolds consisting of microfibers with a PDC shell and sacrificial poly(ethylene glycol) (PEG) core are generated. The hollow PDC microfibers were achieved after dissolving the PEG core with water. The utilization of a fixed electrospinning setup and the same polymer concentration of the PDC spinning solution could ensure the fabrication of microfibers with almost identical outer diameters of 1.4 ± 0.3 µm as determined by scanning electron microscopy (SEM). Different hollow microfiber wall thicknesses of 0.5 ± 0.2 and 0.3 ± 0.2 µm (analyzed by SEM) have been realized by variation of the mass flow rate, while solid microfibers were obtained by coaxial electrospinning without supplying any core solution. Differential scanning calorimetry experiments and tensile tests at ambient temperature revealed an increase in degree of OCL crystallinity form χc,OCL = 34 ± 1\% to 43 ± 1\% and a decrease in elongation of break from 800 ± 40\% to 200 ± 50\% associated with an increase in Young´s modulus and failture stress for PDC hollow microfiber scaffolds when compared with soild fibers. The observed effects were enhanced with decreasing wall thickness of the single hollow fibers. The shape-memory properties of the electrospun PDC scaffolds were quantified by cyclic, thermomechanical tensile tests. Here, scaffolds comprising hollow microfibers exhibited lower shape fixity ratios around Rf = 82 ± 1\% and higher shape recovery ratios of Rr = 67 ± 1\% associated to more pronounced relaxation at constant strain during the first test cycle and a lower switching temperature of Tsw = 33 ± 1 °C than the fibrous meshes consisting of solid microfibers. These findings strongly support the central hypothesis that different fiber geometries (solid or hollow with different wall thickness) in electrospun scaffolds result in different degrees of macromolecular chain orientation in the polymeric micro-scale objects, which can be applied as design parameter for tailoring their mechanical and shape-memory properties. The second part of the thesis deals with electrosprayed particulate PDC micro-scale objects. Almost spherical PDC microparticles with diameters of 3.9 ± 0.9 μm (as determined by SEM) were achieved by electrospraying of HFP solution with a polymer concentration of 2\% w·v-1. In contrast, smaller particles with sizes of 400 ± 100 nm or 1.2 ± 0.3 μm were obtained for the magneto-sensitive composite PDC microparticles containing 23 ± 0.5 wt\% superparamagnetic magnetite nanoparticles (mNPs). All prepared PDC microparticles exhibited a similar overall crystallinity like the PDC bulk material as analyzed by DSC. AFM nanoindentation results revealed no influence of the nanofiller incorporation on the local mechanical properties represented by the reduced modulus determined for pure PDC microparticles and magneto-sensitive composite PDC microparticles with similar diameters around 1.3 µm. It was found that the reduced modulus of the nanocomposite microparticles increased substantially with decreasing particles size from 2.4 ± 0.9 GPa (1.2 µm) to 11.9 ± 3.1 GPa (0.4 µm), which can be related to a higher orientation of the macromolecules at the surface of smaller sized microparticles. The magneto-sensitivity of such nanocomposite microparticles could be demonstrated in two aspects. One was by attracting/collecting the composite micro-objects with an external permanent magnet. The other one was by a inductive heating to 44 ± 1 °C, which is well above the melting transition of the OCL switching domains, when compacted to a 10 x 10 mm2 film with a thickness of 10 µm and exposed to an alternating magnet field with an magnetic field strength of 30 kA·m-1. Both functions are of great relevance for designing next generation drug delivery systems combining targeting and on demand release. By a compression approach shape-memory functionalization of individual microparticles could be realized. Here different programming pressures and compression temperatures were applied. The shape-recovery capability of the programmed PDC microparticles was quantified by online and off-line heating experiments analyzed via microscopy measurement. The obtained shape-memory properties were found to be strongly depending on the applied programming pressure and temperature. The best shape-memory performance with a high shape recovery rate of about Rr = 80±1\% was obtained when a low pressure of 0.2 MPa was applied at 55 °C. Finally, it was demonstrated that PDC microparticles can be utilized as micro building parts for preparation of a macroscopic film with temporary stability by compression of a densely packed array of PDC microparticles at 60 °C followed by subsequent cooling to ambient temperature. This film disintegrates into individual microparticles upon heating to 60 °C. Based on this technology the design of stable macroscopic release systems can be envisioned, which can be easily fixed at the site of treatment (i.e. by suturing) and disintegrate on demand to microparticles facilitating the drug release. In summary, the results of this thesis could confirm the central hypothesis that the variation of the geometry of polymeric micro-objects is a suitable parameter to adjust their shape-memory performance by changing the degree of macromolecular chain orientation in the specimens or by enabling new functions like on demand disintegration. These fundamental findings might be relevant for designing novel miniaturized multifunctional polymer-based devices.},
  language  = {en}
}
@phdthesis{Hoetzel2018,
  author    = {H{\"o}tzel, David},
  title     = {Virtuelle W{\"a}hrungen im System des deutschen Steuerrechts},
  series = {Steuerrecht im Rechtsstaat ; 1},
  journal   = {Steuerrecht im Rechtsstaat ; 1},
  publisher = {Beck},
  address   = {M{\"u}nchen},
  isbn      = {978-3-406-72004-8},
  doi       = {10.17104/9783406798603},
  school      = {Universit{\"a}t Potsdam},
  pages     = {327},
  year      = {2018},
  language  = {de}
}
@phdthesis{Wang2018,
  author    = {Wang, Li},
  title     = {Reprogrammable, magnetically controlled polymer actuators},
  school      = {Universit{\"a}t Potsdam},
  pages     = {xxviii, 107},
  year      = {2018},
  abstract  = {Polymeric materials, which can perform reversible shape changes after programming, in response to a thermal or electrical stimulation, can serve as (soft) actuating components in devices like artificial muscles, photonics, robotics or sensors. Such polymeric actuators can be realized with hydrogels, liquid crystalline elastomers, electro-active polymers or shape-memory polymers by controlling with stumuli such as heat, light, electrostatic or magnetic field. If the application conditions do not allow the direct heating or electric stimulation of these smart devices, noncontact triggering will be required. Remotely controlled actuation have been reported for liquid crystalline elastomer composites or shape-memory polymer network composites, when a persistent external stress is applied during inductive heating in an alternating magnetic field. However such composites cannot meet the demands of applications requiring remotely controlled free-standing motions of the actuating components. The current thesis investigates, whether a reprogrammable remotely controlled soft actuator can be realized by magneto-sensitive multiphase shape-memory copolymer network composites containing magnetite nanoparticles as magneto-sensitive multivalent netpoints. A central hypothesis was that a magnetically controlled two-way (reversible bidirectional) shape-memory effect in such nanocomposites can be achieved without application of external stress (freestanding), when the required orientation of the crystallizable actuation domains (ADs) can be ensured by an internal skeleton like structure formed by a second crystallizable phase determing the samples´s geometry, while magneto-sensitive iron oxide nanoparticles covalently integrated in the ADs allow remote temperature control. The polymer matrix of these composites should exhibit a phase-segregated morphology mainly composed of cyrstallizable ADs, whereby a second set of higher melting crystallites can take a skeleton like, geometry determining function (geometry determining domains, GDs) after programming of the composite and in this way the orientation of the ADs is established and maintained during actuation. The working principle for the reversible bidirectional movements in the multiphase shape-memory polymer network composite is related to a melting-induced contraction (MIC) during inductive heating and the crystallization induced elongation (CIE) of the oriented ADs during cooling. Finally, the amount of multivalent magnetosensitive netpoints in such a material should be as low as possible to ensure an adequate overall elasticity of the nanocomposite and at the same time a complete melting of both ADs and GDs via inductive heating, which is mandatory for enabling reprogrammability. At first, surface decorated iron oxide nanoparticles were synthesized and investigated. The coprecipitation method was applied to synthesize magnetic nanoparticles (mNPs) based on magnetite with size of 12±3 nm and in a next step a ring-opening polymerization (ROP) was utilized for covalent surface modification of such mNPs with oligo(ϵ-caprolactone) (OCL) or oligo(ω-pentadecalactone) (OPDL) via the "grafting from" approach. A successful coating of mNPs with OCL and OPDL was confirmed by differential scanning calorimetry (DSC) experiments showing melting peaks at 52±1 °C for mNP-OCL and 89±1 °C for mNP-OPDL. It was further explored whether two-layered surface decorated mNPs, can be prepared via a second surface-initiated ROP of mNP-OCL or mNP-OPDL with ω-pentadecalactone or ϵ-caprolactone. The observation of two distinct melting transitions in DSC experiments as well as the increase in molecular weight of the detached coatings determined by GPC and 1H-NMR indicated a successful synthesis of the twolayered nanoparticles mNP-OCL-OPDL and mNP-OPDL-OCL. In contrast TEM micrographs revealed a reduction of the thickness of the polymeric coating on the nanoparticles after the second ROP, indicating that the applied synthesis and purification required further optimization. For evaluating the impact of the dispersion of mNPs within a polymer matrix on the resulting inductive heating capability of composites, plain mNPs as well as OCL coated magnetite nanoparticles (mNP-OCLs) were physically incorporated into crosslinked poly(ε-caprolactone) (PCL) networks. Inductive heating experiments were performed with both networks cPCL/mNP and cPCL/mNP-OCL in an alternating magnetic field (AMF) with a magnetic field strength of H = 30 kA·m-1. Here a bulk temperature of Tbulk = 74±2 °C was achieved for cPCL/mNP-OCL, which was almost 20 °C higher than the melting transition of the PCL-based polymer matrix. In contrast, the composite with plain mNPs could only reach a Tbulk of 48±2 °C, which is not sufficient for a complete melting of all PCL crystallites as required for actuation. The inductive heating capability of a multiphase copolymer nanocomposite network (designed as soft actuators) containing surface decorated mNPs as covalent netpoints was investigated. Such composite was synthesized from star-shaped OCL and OPDL precursors, as well as mNP-OCLs via reaction with HDI. The weight ratio of OPDL and OCL in the starting reaction mixture was 15/85 (wt\%/wt\%) and the amount of iron oxide in the nanocomposite was 4 wt\%. DSC experiments revealed two well separated melting and crystallization peaks confirming the required phase-segregated morphology in the nanocomposite NC-mNP-OCL. TEM images could illustrate a phase-segregated morphology of the polymer matrix on the microlevel with droplet shaped regions attributed to the OPDL domains dispersed in an OCL matrix. The TEM images could further demonstrate that the nanoparticulate netpoints in NC-mNP-OCL were almost homogeneously dispersed within the OCL domains. The tests of the inductive heating capability of the nanocomposites at a magnetic field strength of Hhigh = 11.2 kA·m-1 revealed a achievable plateau surface temperature of Tsurf = 57±1 °C for NC-mNP-OCL recorded by an infrared video camera. An effective heat generation constant (̅P) can be derived from a multi-scale model for the heat generation, which is proportional to the rate of heat generation per unit volume of the sample. NC-mNP-OCL with homogeneously dispersed mNP-OCLs exhibited a ̅P value of 1.04±0.01 K·s- 1 at Hhigh, while at Hreset = 30.0 kA·m-1 a Tsurf of 88±1 °C (where all OPDL related crystallite are molten) and a ̅P value of 1.93±0.02 K·s-1 was obtained indicating a high magnetic heating capability of the composite. The free-standing magnetically-controlled reversible shape-memory effect (mrSME) was explored with originally straight nanocomposite samples programmed by bending to an angle of 180°. By switching the magnetic field on and off the composite sample was allowed to repetitively heat to 60 °C and cool to the ambient temperature. A pronounced mrSME, characterized by changes in bending angle of Δϐrev = 20±3° could be obtained for a composite sample programmed by bending when a magnetic field strength of Hhigh = 11.2 kA·m-1 was applied in a multi-cyclic magnetic bending experiment with 600 heating-cooling cycles it could be shown that the actuation performance did not change with increasing number of test cycles, demonstrating the accuracy and reproducibility of this soft actuator. The degree of actuation as well as the kinetics of the shape changes during heating could be tuned by variation of the magnetic filed strength between Hlow and Hhigh or the magnetic field exposure time. When Hreset = 30.0 kA·m-1 was applied the programmed geometry was erased and the composite sample returned to it´s originally straight shape. The reprogrammability of the nanocomposite actuators was demonstrated by one and the same test specimen first exhibiting reversible angle changes when programmed by bending, secondly reprogrammed to a concertina, which expands upon inductive heating and contracts during cooling and finally reprogrammed to a clip like shape, which closes during cooling and opens when Hhigh was applied. In a next step the applicability of the presented remote controllable shape-memory polymer actuators was demonstrated by repetitive opening and closing of a multiring device prepared from NC-mNP-OCL, which repetitively opens and closes when a alternating magnetic field (Hhigh = 11.2 kA·m-1) was switched on and off. For investigation of the micro- and nanostructural changes related to the actuation of the developed nanocomposite, AFM and WAXS experiments were conducted with programmed nanocomposite samples under cyclic heating and cooling between 25 °C and 60 °C. In AFM experiments the change in the distance (D) between representative droplet-like structures related to the OPDL geometry determining domains was used to calculate the reversible change in D. Here Drev = 3.5±1\% was found for NC-mNP-OCL which was in good agreement with the results of the magneto-mechanical actuation experiments. Finally, the analysis of azimuthal (radial) WAXS scattering profiles could support the oriented crystallization of the OCL actuation domains at 25 °C. In conclusion, the results of this work successfully demonstrated that shape-memory polymer nanocomposites, containing mNPs as magneto-sensitive multifunctional netpoints in a covalently crosslinked multiphase polymer matrix, exhibit magnetically (remotely) controlled actuations upon repetitive exposure to an alternating magnetic field. Furthermore, the (shape) memory of such a nanocomposite can be erased by exposing it to temperatures above the melting temperature of the geometry forming domains, which allows a reprogramming of the actuator. These findings would be relevant for designing novel reprogrammable remotely controllable soft polymeric actuators.},
  language  = {en}
}
@book{Lettl2018,
  author    = {Lettl, Tobias},
  title     = {Handelsrecht},
  series = {Juristische Kurz-Lehrb{\"u}cher},
  journal   = {Juristische Kurz-Lehrb{\"u}cher},
  edition   = {4. Aufl.},
  publisher = {Beck},
  address   = {M{\"u}nchen},
  isbn      = {978-3-406-71737-6},
  publisher      = {Universit{\"a}t Potsdam},
  pages     = {327},
  year      = {2018},
  abstract  = {Zum Werk Dieses Lehrbuch erl{\"a}utert anschaulich und didaktisch ausgefeilt das im juristischen und wirtschaftswissenschaftlichen Studium sowie in der Praxis bedeutsame Sonderprivatrecht der Kaufleute. Es behandelt die Materie umfassend und fundiert. Ein Schwerpunkt liegt u.a. auf dem Verh{\"a}ltnis von BGB- und HGB-Regelungen. Das Werk besticht durch eine klare Gliederung des Stoffes. Die einpr{\"a}gsame Sprache und die tiefgr{\"u}ndige Durchdringung des Stoffes machen das Buch nicht nur f{\"u}r Studierende, sondern auch f{\"u}r Spezialisten lesenswert. Inhalt - Kaufleute - Handels- und Unternehmensregister - {\"U}bertragung und Vererbung des kaufm{\"a}nnischen Unternehmens - Unternehmen und Firma - Prokura, Handlungsvollmacht, Ladenvollmacht, Scheinvollmacht - Handelsvertreter, Kommissionsagent, Vertragsh{\"a}ndler etc. - Handelsb{\"u}cher - Handelsgesch{\"a}fte, Verh{\"a}ltnis zum allgemeinen und besonderen Schuldrecht - Handelsgesch{\"a}fte und Sachenrecht - Kommission, Fracht-, Speditions- und Lagergesch{\"a}ft Vorteile auf einen Blick - mit Merks{\"a}tzen und {\"U}bersichten - pr{\"a}gnante Darstellung - optimaler Zuschnitt auf studentische Bed{\"u}rfnisse - Veranschaulichung der Inhalte durch Fallbeispiele Zur Neuauflage Die Neuauflage bringt das Werk auf den neusten Stand der Gesetzgebung, Rechtsprechung und Literatur. Insbesondere wurden die j{\"u}ngsten Entwicklungen auf europ{\"a}ischer Ebene sowie im HGB und UWG ber{\"u}cksichtigt. Zielgruppe F{\"u}r Studierende der Rechts- und Wirtschaftswissenschaften.},
  language  = {de}
}
@phdthesis{Schwarz2018,
  author    = {Schwarz, Patric},
  title     = {Die Umsatzbesteuerung von Energieleistungen},
  series = {Steuerwissenschaftliche Schriften ; 62},
  journal   = {Steuerwissenschaftliche Schriften ; 62},
  publisher = {Nomos},
  address   = {Baden-Baden},
  isbn      = {978-3-8487-4432-9},
  school      = {Universit{\"a}t Potsdam},
  pages     = {334},
  year      = {2018},
  abstract  = {Das Werk unternimmt eine erstmalige zusammenfassende Darstellung der Umsatzbesteuerung von Energieleistungen sowie deren mehrwertsteuerrechtlichen Beurteilung unter besonderer Ber{\"u}cksichtigung aktueller Probleme und Zweifelsfragen. Hierf{\"u}r werden Problembereiche grundlegend und rechtsdogmatisch beleuchtet. Ziel der Arbeit ist es, die wesentlichen Gesch{\"a}ftspraktiken im Energiesektor einer mehrwertsteuerrechtlichen Analyse zu unterwerfen, die stets das unionsrechtliche Mehrwertsteuerrecht und das nationale Umsatzsteuerrecht betrachtet. Es wird untersucht, ob und inwieweit die gegenw{\"a}rtigen Vorschriften zur umsatzsteuerrechtlichen Behandlung von Energieleistungen mit dem europ{\"a}ischen Unionsrecht vereinbar, praxistauglich und angemessen sind. Im Lichte der unaufhaltsam voranschreitenden Energiewende will die vorliegende Untersuchung einen systemimmanenten {\"U}berblick der energierechtlichen Implikationen auf das Mehrwertsteuerrecht in einem einheitlichen mehrwertsteuerrechtlichen Gesamtkontext geben.},
  language  = {de}
}
@phdthesis{Ostrowski2018,
  author    = {Ostrowski, Max},
  title     = {Modern constraint answer set solving},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-407799},
  school      = {Universit{\"a}t Potsdam},
  pages     = {135},
  year      = {2018},
  abstract  = {Answer Set Programming (ASP) is a declarative problem solving approach, combining a rich yet simple modeling language with high-performance solving capabilities. Although this has already resulted in various applications, certain aspects of such applications are more naturally modeled using variables over finite domains, for accounting for resources, fine timings, coordinates, or functions. Our goal is thus to extend ASP with constraints over integers while preserving its declarative nature. This allows for fast prototyping and elaboration tolerant problem descriptions of resource related applications. The resulting paradigm is called Constraint Answer Set Programming (CASP). We present three different approaches for solving CASP problems. The first one, a lazy, modular approach combines an ASP solver with an external system for handling constraints. This approach has the advantage that two state of the art technologies work hand in hand to solve the problem, each concentrating on its part of the problem. The drawback is that inter-constraint dependencies cannot be communicated back to the ASP solver, impeding its learning algorithm. The second approach translates all constraints to ASP. Using the appropriate encoding techniques, this results in a very fast, monolithic system. Unfortunately, due to the large, explicit representation of constraints and variables, translation techniques are restricted to small and mid-sized domains. The third approach merges the lazy and the translational approach, combining the strength of both while removing their weaknesses. To this end, we enhance the dedicated learning techniques of an ASP solver with the inferences of the translating approach in a lazy way. That is, the important knowledge is only made explicit when needed. By using state of the art techniques from neighboring fields, we provide ways to tackle real world, industrial size problems. By extending CASP to reactive solving, we open up new application areas such as online planning with continuous domains and durations.},
  language  = {en}
}
@misc{OPUS4-40564,
  title     = {Jahresbericht 2016},
  volume    = {2016},
  editor    = {Gunnarsson, Logi and Zimmermann, Andreas},
  publisher = {Universit{\"a}tsverlag Potsdam},
  address   = {Potsdam},
  issn      = {1860-5958},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-405642},
  pages     = {51},
  year      = {2018},
  abstract  = {Das MenschenRechtsZentrum der Universit{\"a}t Potsdam (MRZ) besteht seit 22 Jahren. Der Jahresbericht 2016 gibt neben einer Einleitung zu Entstehung, Entwicklung und Aufgaben des MRZ vor allem Informationen zur Organisationsstruktur und zu der T{\"a}tigkeit im Berichtszeitraum. Das Spektrum der Arbeitsergebnisse reicht von der Forschung {\"u}ber Veranstaltungen bis hin zu Publikationen. Zudem verweist der Bericht auf die von seinen Angeh{\"o}rigen gehaltenen Lehrveranstaltungen zu menschenrechtsrelevanten Themen.},
  language  = {de}
}
@phdthesis{Zimmermann2018,
  author    = {Zimmermann, Diana},
  title     = {Direkte Arylierung},
  school      = {Universit{\"a}t Potsdam},
  pages     = {221},
  year      = {2018},
  language  = {de}
}
@phdthesis{AbdAllahSalem2018,
  author    = {Abd Allah Salem, Mohamed},
  title     = {Comparative and systemic metabolomic analysis of the model plant Arabidopsis thaliana after perturbing the essential Target of Rapamycin (TOR) pathway},
  school      = {Universit{\"a}t Potsdam},
  pages     = {113},
  year      = {2018},
  language  = {en}
}
@phdthesis{Heise2018,
  author    = {Heise, Kristian},
  title     = {Haushaltssperren im Recht des Bundes, der L{\"a}nder und der Kommunen},
  series = {Schriften zum {\"o}ffentlichen Recht ; 1366},
  journal   = {Schriften zum {\"o}ffentlichen Recht ; 1366},
  publisher = {Duncker \& Humblot},
  address   = {Berlin},
  isbn      = {978-3-428-15404-3},
  pages     = {271},
  year      = {2018},
  abstract  = {Die Arbeit widmet sich den Haushaltssperren auf den verschiedenen Ebenen und untersucht, ob ein einheitliches Instrument der Haushaltssperre im deutschen Recht existiert, oder ob sich hinter dem Begriff der Haushaltssperre verschiedene haushaltsrechtliche Maßnahmen verbergen. Dazu werden auf verfassungsrechtlicher Ebene der Aspekt der Gewaltenteilung gem{\"a}ß Art. 20 II 2 GG sowie die kommunale Selbstverwaltungsgarantie des Art. 28 II GG betrachtet. Auf Bundes-, Landes- und kommunaler Ebene werden u.a. Sperrvermerke, Globale Minderausgaben, haushaltswirtschaftliche Sperren sowie Bewirtschaftungssperren eingehend dargestellt und er{\"o}rtert. Erg{\"a}nzend werden Aspekte wie weitere Instrumente zur Kontrolle des Haushalts und Rechtsschutz gegen Haushaltssperren dargestellt und Regelungsvorschl{\"a}ge unterbreitet. Im Fazit wird festgestellt, dass »Haushaltssperren« zu komplex und unterschiedlich sind, um ein einheitliches Institut der Haushaltssperre darstellen zu k{\"o}nnen.},
  language  = {de}
}
@misc{ReibisKuehlSalzwedeletal.2018,
  author    = {Reibis, Rona Katharina and K{\"u}hl, Uwe and Salzwedel, Annett and Rasawieh, Mortesa and Eichler, Sarah and Wegscheider, Karl and V{\"o}ller, Heinz},
  title     = {Return to work in heart failure patients with suspected viral myocarditis},
  series = {Postprints der Universit{\"a}t Potsdam : Humanwissenschaftliche Reihe},
  volume    = {5},
  journal   = {Postprints der Universit{\"a}t Potsdam : Humanwissenschaftliche Reihe},
  number    = {378},
  issn      = {1866-8364},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-407637},
  year      = {2018},
  abstract  = {Background: Endomyocardial biopsy is considered as the gold standard in patients with suspected myocarditis. We aimed to evaluate the impact of bioptic findings on prediction of successful return to work. Methods: In 1153 patients (48.9 ± 12.4 years, 66.2\% male), who were hospitalized due to symptoms of left heart failure between 2005 and 2012, an endomyocardial biopsy was performed. Routine clinical and laboratory data, sociodemographic parameters, and noninvasive and invasive cardiac variables including endomyocardial biopsy were registered. Data were linked with return to work data from the German statutory pension insurance program and analyzed by Cox regression. Results: A total of 220 patients had a complete data set of hospital and insurance information. Three quarters of patients were virus-positive (54.2\% parvovirus B19, other or mixed infection 16.7\%). Mean invasive left ventricular ejection fraction was 47.1\% ± 18.6\% (left ventricular ejection fraction <45\% in 46.3\%). Return to work was achieved after a mean interval of 168.8 ± 347.7 days in 220 patients (after 6, 12, and 24 months in 61.3\%, 72.2\%, and 76.4\%). In multivariate regression analysis, only age (per 10 years, hazard ratio, 1.27; 95\% confidence interval, 1.10-1.46; p = 0.001) and left ventricular ejection fraction (per 5\% increase, hazard ratio, 1.07; 95\% confidence interval, 1.03-1.12; p = 0.002) were associated with increased, elevated work intensity (heavy vs light, congestive heart failure, 0.58; 95\% confidence interval, 0.34-0.99; p < 0.049) with decreased probability of return to work. None of the endomyocardial biopsy-derived parameters was significantly associated with return to work in the total group as well as in the subgroup of patients with biopsy-proven myocarditis. Conclusion: Added to established predictors, bioptic data demonstrated no additional impact for return to work probability. Thus, socio-medical evaluation of patients with suspected myocarditis furthermore remains an individually oriented process based primarily on clinical and functional parameters.},
  language  = {en}
}
@phdthesis{Smith2018,
  author    = {Smith, Taylor},
  title     = {Decadal changes in the snow regime of High Mountain Asia, 1987-2016},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-407120},
  school      = {Universit{\"a}t Potsdam},
  pages     = {xiii, 142},
  year      = {2018},
  abstract  = {More than a billion people rely on water from rivers sourced in High Mountain Asia (HMA), a significant portion of which is derived from snow and glacier melt. Rural communities are heavily dependent on the consistency of runoff, and are highly vulnerable to shifts in their local environment brought on by climate change. Despite this dependence, the impacts of climate change in HMA remain poorly constrained due to poor process understanding, complex terrain, and insufficiently dense in-situ measurements. HMA's glaciers contain more frozen water than any region outside of the poles. Their extensive retreat is a highly visible and much studied marker of regional and global climate change. However, in many catchments, snow and snowmelt represent a much larger fraction of the yearly water budget than glacial meltwaters. Despite their importance, climate-related changes in HMA's snow resources have not been well studied. Changes in the volume and distribution of snowpack have complex and extensive impacts on both local and global climates. Eurasian snow cover has been shown to impact the strength and direction of the Indian Summer Monsoon -- which is responsible for much of the precipitation over the Indian Subcontinent -- by modulating earth-surface heating. Shifts in the timing of snowmelt have been shown to limit the productivity of major rangelands, reduce streamflow, modify sediment transport, and impact the spread of vector-borne diseases. However, a large-scale regional study of climate impacts on snow resources had yet to be undertaken. Passive Microwave (PM) remote sensing is a well-established empirical method of studying snow resources over large areas. Since 1987, there have been consistent daily global PM measurements which can be used to derive an estimate of snow depth, and hence snow-water equivalent (SWE) -- the amount of water stored in snowpack. The SWE estimation algorithms were originally developed for flat and even terrain -- such as the Russian and Canadian Arctic -- and have rarely been used in complex terrain such as HMA. This dissertation first examines factors present in HMA that could impact the reliability of SWE estimates. Forest cover, absolute snow depth, long-term average wind speeds, and hillslope angle were found to be the strongest controls on SWE measurement reliability. While forest density and snow depth are factors accounted for in modern SWE retrieval algorithms, wind speed and hillslope angle are not. Despite uncertainty in absolute SWE measurements and differences in the magnitude of SWE retrievals between sensors, single-instrument SWE time series were found to be internally consistent and suitable for trend analysis. Building on this finding, this dissertation tracks changes in SWE across HMA using a statistical decomposition technique. An aggregate decrease in SWE was found (10.6 mm/yr), despite large spatial and seasonal heterogeneities. Winter SWE increased in almost half of HMA, despite general negative trends throughout the rest of the year. The elevation distribution of these negative trends indicates that while changes in SWE have likely impacted glaciers in the region, climate change impacts on these two pieces of the cryosphere are somewhat distinct. Following the discussion of relative changes in SWE, this dissertation explores changes in the timing of the snowmelt season in HMA using a newly developed algorithm. The algorithm is shown to accurately track the onset and end of the snowmelt season (70\% within 5 days of a control dataset, 89\% within 10). Using a 29-year time series, changes in the onset, end, and duration of snowmelt are examined. While nearly the entirety of HMA has experienced an earlier end to the snowmelt season, large regions of HMA have seen a later start to the snowmelt season. Snowmelt periods have also decreased in almost all of HMA, indicating that the snowmelt season is generally shortening and ending earlier across HMA. By examining shifts in both the spatio-temporal distribution of SWE and the timing of the snowmelt season across HMA, we provide a detailed accounting of changes in HMA's snow resources. The overall trend in HMA is towards less SWE storage and a shorter snowmelt season. However, long-term and regional trends conceal distinct seasonal, temporal, and spatial heterogeneity, indicating that changes in snow resources are strongly controlled by local climate and topography, and that inter-annual variability plays a significant role in HMA's snow regime.},
  language  = {en}
}
@misc{FliesserDeWittHubertsWippert2018,
  author    = {Fliesser, Michael and De Witt Huberts, Jessie and Wippert, Pia-Maria},
  title     = {The choice that matters: the relative influence of socioeconomic status indicators on chronic back pain},
  series = {Postprints der Universit{\"a}t Potsdam : Humanwissenschaftliche Reihe},
  journal   = {Postprints der Universit{\"a}t Potsdam : Humanwissenschaftliche Reihe},
  number    = {377},
  issn      = {1866-8364},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-407422},
  year      = {2018},
  abstract  = {Background In health research, indicators of socioeconomic status (SES) are often used interchangeably and often lack theoretical foundation. This makes it difficult to compare results from different studies and to explore the relationship between SES and health outcomes. To aid researchers in choosing appropriate indicators of SES, this article proposes and tests a theory-based selection of SES indicators using chronic back pain as a health outcome. Methods Strength of relationship predictions were made using Brunner \& Marmot's model of 'social determinants of health'. Subsequently, a longitudinal study was conducted with 66 patients receiving in-patient treatment for chronic back pain. Sociodemographic variables, four SES indicators (education, job position, income, multidimensional index) and back pain intensity and disability were obtained at baseline. Both pain dimensions were assessed again 6 months later. Using linear regression, the predictive strength of each SES indicator on pain intensity and disability was estimated and compared to the theory based prediction. Results Chronic back pain intensity was best predicted by the multidimensional index (beta = 0.31, p < 0.05), followed by job position (beta = 0.29, p < 0.05) and education (beta = -0.29, p < 0.05); whereas, income exerted no significant influence. Back pain disability was predicted strongest by education (beta = -0.30, p < 0.05) and job position (beta = 0.29, p < 0.05). Here, multidimensional index and income had no significant influence. Conclusions The choice of SES indicators influences predictive power on both back pain dimensions, suggesting SES predictors cannot be used interchangeably. Therefore, researchers should carefully consider prior to each study which SES indicator to use. The introduced framework can be valuable in supporting this decision because it allows for a stable prediction of SES indicator influence and their hierarchy on a specific health outcomes.},
  language  = {en}
}
@misc{WippertPuschmannArampatzisetal.2018,
  author    = {Wippert, Pia-Maria and Puschmann, Anne-Katrin and Arampatzis, Adamantios and Schiltenwolf, Marcus and Mayer, Frank},
  title     = {Diagnosis of psychosocial risk factors in prevention of low back pain in athletes (MiSpEx)},
  issn      = {1866-8364},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-407391},
  year      = {2018},
  abstract  = {Background Low back pain (LBP) is a common pain syndrome in athletes, responsible for 28\% of missed training days/year. Psychosocial factors contribute to chronic pain development. This study aims to investigate the transferability of psychosocial screening tools developed in the general population to athletes and to define athlete-specific thresholds. Methods Data from a prospective multicentre study on LBP were collected at baseline and 1-year follow-up (n=52 athletes, n=289 recreational athletes and n=246 non-athletes). Pain was assessed using the Chronic Pain Grade questionnaire. The psychosocial Risk Stratification Index (RSI) was used to obtain prognostic information regarding the risk of chronic LBP (CLBP). Individual psychosocial risk profile was gained with the Risk Prevention Index - Social (RPI-S). Differences between groups were calculated using general linear models and planned contrasts. Discrimination thresholds for athletes were defined with receiver operating characteristics (ROC) curves. Results Athletes and recreational athletes showed significantly lower psychosocial risk profiles and prognostic risk for CLBP than non-athletes. ROC curves suggested discrimination thresholds for athletes were different compared with non-athletes. Both screenings demonstrated very good sensitivity (RSI=100\%; RPI-S: 75\%-100\%) and specificity (RSI: 76\%-93\%; RPI-S: 71\%-93\%). RSI revealed two risk classes for pain intensity (area under the curve (AUC) 0.92(95\% CI 0.85 to 1.0)) and pain disability (AUC 0.88(95\% CI 0.71 to 1.0)). Conclusions Both screening tools can be used for athletes. Athlete-specific thresholds will improve physicians' decision making and allow stratified treatment and prevention.},
  language  = {en}
}
@phdthesis{Siegmund2018,
  author    = {Siegmund, Jonatan Frederik},
  title     = {Quantifying impacts of climate extreme events on vegetation},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-407095},
  school      = {Universit{\"a}t Potsdam},
  pages     = {129},
  year      = {2018},
  abstract  = {Together with the gradual change of mean values, ongoing climate change is projected to increase frequency and amplitude of temperature and precipitation extremes in many regions of Europe. The impacts of such in most cases short term extraordinary climate situations on terrestrial ecosystems are a matter of central interest of recent climate change research, because it can not per se be assumed that known dependencies between climate variables and ecosystems are linearly scalable. So far, yet, there is a high demand for a method to quantify such impacts in terms of simultaneities of event time series. In the course of this manuscript the new statistical approach of Event Coincidence Analysis (ECA) as well as it's R implementation is introduced, a methodology that allows assessing whether or not two types of event time series exhibit similar sequences of occurrences. Applications of the method are presented, analyzing climate impacts on different temporal and spacial scales: the impact of extraordinary expressions of various climatic variables on tree stem variations (subdaily and local scale), the impact of extreme temperature and precipitation events on the owering time of European shrub species (weekly and country scale), the impact of extreme temperature events on ecosystem health in terms of NDVI (weekly and continental scale) and the impact of El Ni{\~n}o and La Ni{\~n}a events on precipitation anomalies (seasonal and global scale). The applications presented in this thesis refine already known relationships based on classical methods and also deliver substantial new findings to the scientific community: the widely known positive correlation between flowering time and temperature for example is confirmed to be valid for the tails of the distributions while the widely assumed positive dependency between stem diameter variation and temperature is shown to be not valid for very warm and very cold days. The larger scale investigations underline the sensitivity of anthrogenically shaped landscapes towards temperature extremes in Europe and provide a comprehensive global ENSO impact map for strong precipitation events. Finally, by publishing the R implementation of the method, this thesis shall enable other researcher to further investigate on similar research questions by using Event Coincidence Analysis.},
  language  = {en}
}
@misc{Schwarz2018,
  author    = {Schwarz, Anja},
  title     = {"Parallel Societies" of the past?},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-403655},
  pages     = {13},
  year      = {2018},
  abstract  = {Historical narratives play an important role in constructing contemporary notions of citizenship. They are sites on which ideas of the nation are not only reaffirmed but also contested and reframed. In contemporary Germany, dominant narratives of the country's modern history habitually focus on the legacy of the Third Reich and tend to marginalize the country's rich and highly complex histories of immigration. The article addresses this commemorative void in relation to Berlin's urban landscape. It explores how the city's multilayered architecture provides locations for the articulation of marginal memories—and hence sites of urban citizenship—that are often denied to immigrant communities on a national scale. Through a detailed examination of a small celebration in 1965 that marked the anniversary of the founding of the modern Turkish republic, the article engages with the layers of history that coalesce around such sites in Berlin.},
  language  = {en}
}