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