On the predictive power of Local Scale Invariance

Local Scale Invariance (LSI) is a theory for anisotropic critical phenomena designed in the spirit of conformal invariance. For a given representation of its generators it makes non-trivial predictions about the form of universal scaling functions. In the past decade several representations have been identified and the corresponding predictions were confirmed for various anisotropic critical systems. Such tests are usually based on a comparison of two-point quantities such as autocorrelation and response functions. The present work highlights a potential problem of the theory in the sense that it may predict any type of two-point function. More specifically, it is argued that for a given two-point correlator it is possible to construct a representation of the generators which exactly reproduces this particular correlator. This observation calls for a critical examination of the predictive content of the theory.Comment: 17 pages, 2 eps figure

Präeklampsie, Pathogenese und Vorhersage

Zusammenfassung: Die eigentliche Ursache der Präeklampsie ist nach wie vor unklar, doch die Plazenta ist für die Pathogenese unbestritten von zentraler Bedeutung. Die früh manifest werdende Erkrankung kann auf eine intrinsische Störung des Trophoblasten zurückgeführt werden. Wenn diese bereits in einer sehr frühen Phase des undifferenzierten Trophoblasten wirksam wird, entwickelt sich klinisch eine Präeklampsie kombiniert mit einer intrauterinen Wachstumsrestriktion. Bei später einsetzender Beeinträchtigung kann diese vor allem den villösen oder extravillösen Phänotyp des Trophoblasten betreffen, und das klinische Bild entspricht einer Präeklampsie oder einer isolierten intrauterinen Wachstumsrestriktion. Die Störung des Trophoblasten wirkt sich auf die Produktion von Proteinen aus, und Veränderungen im Spiegel dieser Biomarker im Serum der Schwangeren ermöglichen die Vorhersage der Erkrankung bereits im ersten oder frühen zweiten Trimester. Aus der Verknüpfung der biochemischen Serummarker mit verschiedenen biophysikalischen Parametern, wie Blutdruck, Dopplerprofil des Blutflusses in der A.uterina und klinischen Risikomerkmalen, können Risikoalgorithmen erstellt werden. Präeklampsien, bei denen Symptome erst spät auftreten, entwickeln sich vor allem bei großen Plazenten; das Wachstum des Feten ist normal und insgesamt ist die Prognose für Mutter und Kind günstiger als bei frühem Begin

‘Your daily reality is rubbish’: Waste as a means of urban exclusion in the suspended spaces of East Jerusalem

Drawing on ethnographic and visual research, this article examines the role of waste in two areas of occupied East Jerusalem cut off from the city by the Separation Wall and military checkpoints, Kufr Aqab and Shuafat Refugee Camp as well as their immediate surroundings. In asking how urban exclusion operates on the margins of the city, we argue that rubbish can disclose broader socio-spatial relations at work in Jerusalem from the ground up. We find that waste serves to reduce the ambiguity at work in these interstitial zones by furthering exclusion – it operates through the urban everyday where the legal and political situations are in suspension. Conceptually, we contribute to the discussion on spatial stigma associated with infrastructural violence by arguing for a multi-layered understanding of the way waste ‘works’ in urban exclusion. Three registers mutually constitute each other in this process: the materiality of waste with its embodied and affective interactions, the symbolic and discursive violence associated with waste, as well as spatialised stigma and bordering processes

Ageing in disordered magnets and local scale-invariance

The ageing of the bond-disordered two-dimensional Ising model quenched to below its critical point is studied through the two-time autocorrelator and thermoremanent magnetization (TRM). The corresponding ageing exponents are determined. The form of the scaling function of the TRM is well described by the theory of local scale-invariance.Comment: Latex2e, with epl macros, 7 pages, final for

Generation of multi-modal dialogue for a net environment

In this paper an architecture and special purpose markup language for simulated affective face-to-face communication is presented. In systems based on this architecture, users will be able to watch embodied conversational agents interact with each other in virtual locations on the internet. The markup language, or Rich Representation Language (RRL), has been designed to provide an integrated representation of speech, gesture, posture and facial animation

Context-specific grasp movement representation in the macaque anterior intraparietal area

To perform grasping movements, the hand is shaped according to the form of the target object and the intended manipulation, which in turn depends on the context of the action. The anterior intraparietal cortex (AIP) is strongly involved in the sensorimotor transformation of grasping movements, but the extent to which it encodes context-specific information for hand grasping is unclear. To explore this issue, we recorded 571 single-units in AIP of two macaques during a delayed grasping task, in which animals were instructed by an external context cue (LED) to perform power or precision grips on a handle that was presented in various orientations. While 55% of the recorded neurons encoded the object orientation from the cue epoch on, the number of cells encoding the grip type increased from 25% during the cue epoch to 58% during movement execution. Furthermore, a classification of cells according to the time of their tuning onset revealed differences in the function and anatomical location of early- versus late-tuned cells. In a cue separation task, when the object was presented first, neurons representing power or precision grips were activated simultaneously until the actual grip type was instructed. In contrast, when the grasp type instruction was presented before the object, type information was only weakly represented in AIP, but was strongly encoded after the grasp target was revealed. We conclude that AIP encodes context specific hand grasping movements to perceived objects, but in the absence of a grasp target, the encoding of context information is weak

Persistent photovoltage in methylammonium lead iodide perovskite solar cells

Open circuit voltage decay measurements are performed on methylammonium lead iodide (CH3NH3PbI3) perovskite solar cells to investigate the charge carrier recombination dynamics. The measurements are compared to the two reference polymer-fullerene bulk heterojunction solar cells based on P3HT:PC60BM and PTB7:PC70BM blends. In the perovskite devices, two very different time domains of the voltage decay are found, with a first drop on a short time scale that is similar to the organic solar cells. However, two major differences are also observed. 65-70% of the maximum photovoltage persists on much longer timescales, and the recombination dynamics are dependent on the illumination intensity.Comment: 5 pages, 3 figure

Ageing in bosonic particle-reaction models with long-range transport

Ageing in systems without detailed balance is studied in bosonic contact and pair-contact processes with Levy diffusion. In the ageing regime, the dynamical scaling of the two-time correlation function and two-time response function is found and analysed. Exact results for non-equilibrium exponents and scaling functions are derived. The behaviour of the fluctuation-dissipation ratio is analysed. A passage time from the quasi-stationary regime to the ageing regime is defined, in qualitative agreement with kinetic spherical models and p-spin spherical glasses.Comment: Latex2e, 24 pages, with 9 figures include