10,086 research outputs found

    Tendencies in Mexican-Russian economical relationship

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    In this article the questions of transformation and strengthening of the Russian-Mexican cooperation at the present stage are considered. The main products for importation and exportation of Russia and Mexico are listed for the branches of industry, agriculture, science and education. The article describes the relationship between Russia and Mexico in tourism and how it can help to improve their economic growth and country development in the next periods. The directions of development of relations in the sphere of tourism are named

    Migrations temporaires au Chaparé (Bolivie) et stratégies alimentaires

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    L'√©tude de l'√©conomie familiale et du syst√®me alimentaire des paysans quechuas de la communaut√© d'altitude de Pampa Churigua, situ√©e dans la r√©gion des vall√©es interandines de Bolivie (Cochabamba), montre que la migration temporaire vers les zones de production de coca du Chapar√©, dont les flux actuels demeurent importants malgr√© le contr√īle du trafic de coca√Įne depuis 1986, ne constitue pas seulement une alternative √©conomique face √† la d√©t√©rioration des conditions de production agropastorale (parcellisation excessive des terres, s√©cheresse, politiques agricoles...). La migration vers les zones de production de coca est √©galement une strat√©gie de diversification et d'extension spatiale des modes d'approvisionnement alimentaire, devenue essentielle pour la survie des familles paysannes. De plus, cet √©largissement de l'espace paysan, bas√© sur une nouvelle compl√©mentarit√© des diff√©rents √©tages √©cologiques, est une mani√®re, pour le groupe social, de renouer avec un mode ancestral d'utilisation de l'espace proprement andin. (R√©sum√© d'auteur

    Twin Peaks: A possible signal in the production of resonances beyond special relativity

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    It is usually expected that quantum gravity corrections will modify somehow the symmetries of special relativity. In this paper we point out that the possibility of very low-energy (with respect to the Planck energy) modifications to special relativity in the framework of a deformed relativistic theory is not ruled out, and that, depending on the value of that scale, such a possibility could be tested in accelerator physics. In particular, we take a simple example of a relativistic kinematics beyond special relativity from the literature, and obtain a remarkable effect: two correlated peaks ("twin peaks") associated to a single resonance. We analyze this phenomenology in detail, use LEP data to put constraints of the order of TeV on the scale of corrections to special relativity, and note that such an effect might be observable in a future very high-energy proton collider.Comment: 17 pages, accepted for publication in Symmetr

    Identification of redundant and synergetic circuits in triplets of electrophysiological data

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    Neural systems are comprised of interacting units, and relevant information regarding their function or malfunction can be inferred by analyzing the statistical dependencies between the activity of each unit. Whilst correlations and mutual information are commonly used to characterize these dependencies, our objective here is to extend interactions to triplets of variables to better detect and characterize dynamic information transfer. Our approach relies on the measure of interaction information (II). The sign of II provides information as to the extent to which the interaction of variables in triplets is redundant (R) or synergetic (S). Here, based on this approach, we calculated the R and S status for triplets of electrophysiological data recorded from drug-resistant patients with mesial temporal lobe epilepsy in order to study the spatial organization and dynamics of R and S close to the epileptogenic zone (the area responsible for seizure propagation). In terms of spatial organization, our results show that R matched the epileptogenic zone while S was distributed more in the surrounding area. In relation to dynamics, R made the largest contribution to high frequency bands (14-100Hz), whilst S was expressed more strongly at lower frequencies (1-7Hz). Thus, applying interaction information to such clinical data reveals new aspects of epileptogenic structure in terms of the nature (redundancy vs. synergy) and dynamics (fast vs. slow rhythms) of the interactions. We expect this methodology, robust and simple, can reveal new aspects beyond pair-interactions in networks of interacting units in other setups with multi-recording data sets (and thus, not necessarily in epilepsy, the pathology we have approached here).Comment: 31 pages, 6 figures, 3 supplementary figures. To appear in the Journal of Neural Engineering in its current for
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