664 research outputs found

    Remembrance of Odors Past Human Olfactory Cortex in Cross-Modal Recognition Memory

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    AbstractEpisodic memory is often imbued with multisensory richness, such that the recall of an event can be endowed with the sights, sounds, and smells of its prior occurrence. While hippocampus and related medial temporal structures are implicated in episodic memory retrieval, the participation of sensory-specific cortex in representing the qualities of an episode is less well established. We combined functional magnetic resonance imaging (fMRI) with a cross-modal paradigm, where objects were presented with odors during memory encoding. We then examined the effect of odor context on neural responses at retrieval when these same objects were presented alone. Primary olfactory (piriform) cortex, as well as anterior hippocampus, was activated during the successful retrieval of old (compared to new) objects. Our findings indicate that sensory features of the original engram are preserved in unimodal olfactory cortex. We suggest that reactivation of memory traces distributed across modality-specific brain areas underpins the sensory qualities of episodic memories

    Simulation of turbulent flow and contaminant dispersion in a street network

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    Efektivní metody pro výpočet turbulentního proudění jsou již dlouho předmětem intenzivního výzkumu. Takovou metodou je implicitní metoda velkých vírů pomocí spektrální mizející viskozity, jíž se zabývá tato práce. Byla navržena geometrie spolu s okrajovými podmínkami vhodnými pro modelování transportu pasivního skaláru v síti uličních kaňonů. Na této geometrii byly vypočteny simulace proudění metodou spektrálních/hp prvků za užití spektrální mizející viskozity, která je implementována v prostředí Nektar++. Výsledná pole, včetně spekter turbulentní energie, byla porovnána s ostatními metodami pro modelování turbulence a s experimentálními daty.Effective ways to compute turbulent flow fields have long been a subject of intense research. One such method, the implicit large eddy simulation using spectral vanishing viscosity is investigated in this work. Suitable geometry and boundary conditions are proposed to model turbulent transport of passive scalar in a street canyon network. In this geometry, simulations are run using the spectral/hp element method implemented with spectral vanishing viscosity in Nektar++ framework. The results including energy spectra are studied and compared to other methods of modeling turbulent flows and with experimental data

    Bergpredigt

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    "I have a dream" : das Vermächtnis Martin Luther Kings

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    Aufgaben und Möglichkeiten evangelischer Elternarbeit

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