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Mirror neurons are brain cells that are activated by the execution/observation of a movement. It has been proposed that its functions are altered in autism spectrum disorder (ASD), which is evidenced by the absence of desynchronization of the mu rhythm of the electroencephalogram when observing a biological movement, a theory known as broken mirror. The objective of this study was to test this theory in a Colombian sample. Desynchronizations of the mu rhythm of the electroencephalogram were evaluated in conditions of observation/imitation of a biological movement and in the observation of two non-biological movements in 35 cases and 19 control pairs, with ages between 6 and 16 years old. Participants with ASD presented lower desynchronizations than controls when observing/imitation of biological movement, but higher when observing inert elements. Participants with ASD established greater connection with objects than with other individuals. The broken mirror was not a homogeneous phenomenon in ASD nor a discriminating characteristic between cases and controls. Individual differences played an important role in the functioning of mirror neurons. We propose strategies based on these findings for people with Autism Spectrum Disorder in clinical, educational, productive and social contexts. [ABSTRACT FROM AUTHOR]

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We use a deposition model in order to simulate the grow of rare gases crystals doped with tungsten hexacarbonyl as impurity. The simulations were carried out using Classical Molecular Dynamics, applying quantum corrections to improve the interactions between atoms. Several trapping sites were identified and probabilistic and energetic studies were done as well. We found that sites preference of the molecule is close related with crystallographic properties of rare gases solids and the temperature of the system. The obtained information is quite important to clarify the experimental results obtained by trapping the molecule using matrix isolation technique and infrared spectroscopy. Results were compared with experimental data recorded from previous studies of the system. [ABSTRACT FROM AUTHOR]

It has been designed and built a capacitive source for pulsed discharge electrical of high voltage and current discharges by pulse, by spectral study of atom medium and highly ionized. The unloadings are made between two electrodes within a glass tube that contains low pressures gases or vapour. The particular characteristics of this source related to the current, the tension and duration of the unloading turn it in a not-conventional spectral source to generate atomic species medium and highly ionized. In this work it present a description of its construction as well as some parameters of operation. [ABSTRACT FROM AUTHOR]

The phase space structure of a generic Hamiltonian model describing the vibrational dynamics of the molecular complexes GrBr2(X) (Gr = He, Ne, Ar) is studied, by constructing the Poincaré surfaces of section and considering results of the Canonical Perturbation Theory. According to our results, we can assure that all the systems studied here exhibit near-integrable behavior, and that the collocation coefficients contain qualitatively important information about the Hamiltonian perturbation strength. The cited perturbation strength, is found to be strongly dependent on the considered isomer (linear or T) so as the rare gas involved. Finally, an undesired feature of the potential energy surface reported in [27] for the HeBr2 molecule is also briefly commented. [ABSTRACT FROM AUTHOR]

Through finite difference modelling, we studied the effects of seismic scattering due near surface high velocity layers, with varied contrasts and thickness, and their influence on seismic data. Despite conventional methods to eliminate noise mainly based in a mathematical approach, i.e., F-K analysis, Radon transform, we apply a deterministic scheme based on the modelling of wave propagation, generating the unwanted signals (Ernst et al., 1998; Blonk et al., 1995; Blonk and Hermann, 1994). The detailed understanding of the backscattering phenomenon allows to discern what can be considered noise and therefore to define attenuation's strategies (Lamer et al., 1983). In presence of near surface high velocity layers, part of the original seismic energy is scattered in these layers and only a smaller fraction is transmitted to the Earth's interior, generating coherent noise that masks the information comming from the deeper reflectors (Leslie and Evans, 1999). A 2D model was designed to obtain synthetic seismograms. The simulation shows the scattering mechanism related with velocity inversions in the near surface layers, allowing to characterize their influence on seismic records. The unwanted signal is subtracted from that considered information. The results obtained in this work are bounded to the analysis of synthetic data. [ABSTRACT FROM AUTHOR]