794 research outputs found
Televisione. Sequestro e dissequestro della storia
Born together with the history it narrates, television takes over the role of power supply and archive of
national and individual memory. At the same time, Tv is expression and manifestation of our
memories and fundamental component of identity, like no nedium has done. All this allows to affirm
that current affairs are turning into our history as a result of speed of TV. The accompanying path
between the social history of the country and television storytelling are the focus of this article. After a
review of the possible contamination between history and television, this essay focuses on the
narrative function of TV and the high incidence of this medium on the visibility or cancellation of
events, social facts and characters.To demonstrate the responsibility of TV over the historicizing
process and the impact on collective memory, in the second part of this essay we have been brought
into focu
Human Motion Trajectory Prediction: A Survey
With growing numbers of intelligent autonomous systems in human environments,
the ability of such systems to perceive, understand and anticipate human
behavior becomes increasingly important. Specifically, predicting future
positions of dynamic agents and planning considering such predictions are key
tasks for self-driving vehicles, service robots and advanced surveillance
systems. This paper provides a survey of human motion trajectory prediction. We
review, analyze and structure a large selection of work from different
communities and propose a taxonomy that categorizes existing methods based on
the motion modeling approach and level of contextual information used. We
provide an overview of the existing datasets and performance metrics. We
discuss limitations of the state of the art and outline directions for further
research.Comment: Submitted to the International Journal of Robotics Research (IJRR),
37 page
Stabilizing quantum metastable states in a time-periodic potential
Metastability of a particle trapped in a well with a time-periodically
oscillating barrier is studied in the Floquet formalism. It is shown that the
oscillating barrier causes the system to decay faster in general. However,
avoided crossings of metastable states can occur with the less stable states
crossing over to the more stable ones. If in the static well there exists a
bound state, then it is possible to stabilize a metastable state by
adiabatically increasing the oscillating frequency of the barrier so that the
unstable state eventually cross-over to the stable bound state. It is also
found that increasing the amplitude of the oscillating field may change a
direct crossing of states into an avoided one.Comment: 7 pages, 6 figure
Directed transport and localization in phase-modulated driven lattices
We explore the dynamics of non-interacting particles loaded into a
phase-modulated one-dimensional lattice formed by laterally oscillating square
barriers. Tuning the parameters of the driven unit cell of the lattice selected
parts of the classical phase space can be manipulated in a controllable manner.
We find superdiffusion in position space for all parameters regimes. A directed
current of an ensemble of particles can be created through locally breaking the
spatiotemporal symmetries of the time-driven potential. Magnitude and direction
of the current are tunable. Several mechanisms for transient localization and
trapping of particles in different wells of the driven unit cell are presented
and analyzed
How do Cross-View and Cross-Modal Alignment Affect Representations in Contrastive Learning?
Various state-of-the-art self-supervised visual representation learning
approaches take advantage of data from multiple sensors by aligning the feature
representations across views and/or modalities. In this work, we investigate
how aligning representations affects the visual features obtained from
cross-view and cross-modal contrastive learning on images and point clouds. On
five real-world datasets and on five tasks, we train and evaluate 108 models
based on four pretraining variations. We find that cross-modal representation
alignment discards complementary visual information, such as color and texture,
and instead emphasizes redundant depth cues. The depth cues obtained from
pretraining improve downstream depth prediction performance. Also overall,
cross-modal alignment leads to more robust encoders than pre-training by
cross-view alignment, especially on depth prediction, instance segmentation,
and object detection
Long double-stranded RNA-mediated suppression of PER2 in the SCN disrupts circadian locomotor activity and PER2 rhythms in the limbic forebrain
Studies with targeted disruption in the Period2 ( Per2 ) gene suggest that the PER2 protein participates in the regulation of circadian behavioral rhythms. Moreover, it has been shown that direct suppression of PER2 expression in the suprachiasmatic nucleus (SCN) with antisense oligonucleotides disrupts photic resetting of the SCN clock. The effect of such suppression on behavioral rhythms is unknown. Here double-stranded RNA (dsRNA) to Per2 was used to transiently suppress PER2 expression in the SCN of adult rats. Bilateral infusions of dsRNA into the SCN (6 g/side) disrupted circadian wheel running activity rhythms for up to 10 days in experimental rats housed in constant darkness; whereas, control infusions into the SCN or dorsal infusions of dsRNA to Per2 had no effect. Relative to controls PER2 suppression in the SCN was evident 12 days post-dsRNA infusion; however, maximal suppression was observed at day 3. In addition to the suppression of PER2 expression in the SCN, a blunted PER2 rhythm was observed in the oval nucleus of the bed nucleus of the stria terminalis, central nucleus of the amygdala and dentate gyrus. These results provide direct evidence that the expression of PER2 in the SCN is essential for the maintenance of circadian locomotor activity rhythms and for the expression of PER2 rhythms in the limbic forebrain in rats. The specificity of this effect was validated by demonstrating no difference between cFos expression in any of the above areas in control rats and rats treated with dsRNA to Per2
Are the renormalized band widths in TTF-TCNQ of structural or electronic origin? - An angular dependent NEXAFS study
We have performed angle-dependent near-edge x-ray absorption fine structure
measurements in the Auger electron yield mode on the correlated
quasi-one-dimensional organic conductor TTF-TCNQ in order to determine the
orientation of the molecules in the topmost surface layer. We find that the
tilt angles of the molecules with respect to the one-dimensional axis are
essentially the same as in the bulk. Thus we can rule out surface relaxation as
the origin of the renormalized band widths which were inferred from the
analysis of photoemission data within the one-dimensional Hubbard model.
Thereby recent theoretical results are corroborated which invoke long-range
Coulomb repulsion as alternative explanation to understand the spectral
dispersions of TTF-TCNQ quantitatively within an extended Hubbard model.Comment: 6 pages, 5 figure
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