The Realization of Artificial Kondo Lattices in Nanostructured Arrays

The interplay of magnetic energies in a Kondo lattice is the underlying physics of a heavy fermion system. Creating an artificial Kondo lattice system by localizing the moments in an ordered metallic array provides a prototype system to tune and study the energetic interplay while avoiding the complications introduced by random alloying of the material. In this article, we create a Kondo lattice system by fabricating a hexagonally ordered nanostructured array using niobium as the host metal and cobalt as the magnetic constituent. Electrical transport measurements and magnetoresistivity measurements of these artificial lattices show that the competing exchange coupling properties can be easily tuned by controlling the impurity percentage. These artificial Kondo lattice systems enable the exploration of an artificial superconductor which should lead to a deep understanding of the role of magnetism in unconventional superconductors.Comment: Artificial Magnetic Crystal

γ\gamma - Z interferometry at a Φ\Phi-factory

We analyze the possibilities that the proposed $\Phi$-factories offer to measure $\gamma-Z$ interference. In the unpolarized beam case, we study different signatures in the $\rho \pi$ channel, taking advantage of the presence of the near-by $a_1$ resonance. We build a C-odd forward-backward asymmetry, estimated to be around $10^{-5}$, and (P-even, T-even) and (P-odd, T-odd) alignments of the $\rho$, to be seen from the angular distribution of its $\pi \pi$ decay products. With polarized electrons a left-right asymmetry around $2\times 10^{-4}$ is present in all channels. At leading order this asymmetry is independent of hadronic matrix elements and is sensitive to the $Z^0-s\bar{s}$ vector coupling. In the $\rho \pi$ channel, a combined left-right forward-backward asymmetry is considered.Comment: 29 pages + 6 figures. Some changes concerning $a_1$ observables, especially related with possible 2 $\gamma$ contribution

Creencias, emociones e influencias interpersonales : un caso de docentes en formación de un profesorado de inglés

Los docentes en formación deben insertarse y realizar sus intervenciones en contextos y culturas educativos que están en permanente cambio. En consecuencia, sus percepciones respecto de las diversas dimensiones de los procesos de enseñanza y aprendizaje también se van modificando y evolucionando. En las últimas décadas, las creencias tanto de docentes como de alumnos han sido objeto de análisis de numerosas investigaciones debido a su incidencia tanto en el aprendizaje como en la enseñanza. Esta comunicación tiene como objetivo a) describir cómo los docentes de lengua extranjera en formación conciben la enseñanza eficaz de una lengua-cultura extranjera y los nuevos roles de docentes y alumnos y b) comprender cómo esas creencias se relacionan con sus emociones e influencias interpersonales. La investigación fue de carácter cualitativo y sellevó a cabo en la Facultad de Lenguas de la Universidad Nacional de Córdoba. Desdeun enfoque contextual (Barcelos, 2003), se recolectaron 17 biografías escolaresrealizadas por futuros profesores de Lengua Inglesa y se analizaron los datos,recurriendo a la técnica de análisis de contenido. Los resultados evidenciaronvariadas creencias en cuanto a los aspectos indagados así como también unaestrecha relación entre las creencias de los participantes, sus emociones y lasinfluencias interpersonales.http://jimemorias.psi.uba.ar/index.aspx?anio=2017Fil: San Martín, María Gimena. Universidad Nacional de Córdoba. Facultad de Lenguas; Argentina.Fil: Albretch, Marianela Edith. Universidad Nacional de Córdoba. Facultad de Lenguas; Argentina.Fil: Ubino, Victoria. Universidad Nacional de Córdoba. Facultad de Lenguas; Argentina.Otras Psicologí

Screen Printed Security-Button for Radio Frequency Identification Tags

Radio frequency identi cation (RFID) security is a relevant matter. The wide spread of RFID applications in the general society and the persistent attempts to safeguard it con rm it, especially since its use involves payments and the store or transmission of sensitive information. In this contribution, we present an innovative solution for improving the security of RFID passive tags through the use of a screen printed button, that allows the reception and transmission only when a certain level of physical pressure normal to its plane is applied. The materials and fabrication technology used demonstrate an easy to implement and cost-effective system, valuable in several scenarios where the user has straight contact with the tags and where its usage is direct and intentional.This work was supported by the fellowship under Grant 2020-MSCA-IF-2017-794885-SELFSENS

Learning experiences comprising central ethanol exposure in rat neonates: Effects upon respiratory plasticity and the brain catalase system

Fetal ethanol (EtOH) exposure represents a risk factor for the Sudden Infant Death Syndrome and it’s early effects upon respiration also promotes hypoxic ischemic consequences. This study analyzes central ethanol’s effects upon breathing plasticity during a stage in the development of the rat equivalent to the 3rd human gestational trimester. The study not only analyzed ethanol’s unconditioned breathing effects but also how they are regulated by learning processes. Taking into account that ethanol is primarily metabolized in the brain via the catalase system, we examined the effects of early history with the drug upon the activity of this enzymatic system. During postnatal days 3, 5 and 7 (PDs 3-7) pups either received intracisternal (i.c.) administrations of vehicle or ethanol (300 mg%). They were subsequently exposed to a whole body plethysmograph under normoxia. The apparatus was scented or not with the ethanol odor. The presence of the odorant increased breathing rates. The state of intoxication attenuated the onset of apneas; a phenomenon indicative of an antianxiety effect of the drug given the state of arousal caused by the novel environment, maternal deprivation and the stress of i.c. administrations. At PD9, pups were tested while sober under sequential air conditions (initial-normoxia, hypoxia and recovery-normoxia). Once again the plethysmograh was unscented or contained EtOH odor. Prior experience with the scented chamber associated with EtOH’s central effects elicited a conditioned isodirectional response relative to the onset of apneas previously observed during PDs 3-7. Yet, prior history with the drug exacerbated the onset of apneas when pups were defied with hypoxia. Following this test, pups ingested 0.8 g/kg of absolute EtOH and their brains were analyzed to determine catalase activity. Pre-exposure to EtOH’s central effects paired with the odor of the drug resulted in heightened enzymatic activity. The results indicate that central EtOH accumulation may exert antianxiety effects that attenuate apneic disruptions but that also has long-lasting effects upon respiratory plasticity under hypoxia. Most importantly, these effects appear to be related with how the brain catalase system reacts to the presence of EtOH in accordance with the nature of prior experiences with the drug.Fil: Trujillo, Verónica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigación Médica Mercedes y Martín Ferreyra. Universidad Nacional de Córdoba. Instituto de Investigación Médica Mercedes y Martín Ferreyra; ArgentinaFil: Macchione, Ana Fabiola. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigación Médica Mercedes y Martín Ferreyra. Universidad Nacional de Córdoba. Instituto de Investigación Médica Mercedes y Martín Ferreyra; Argentina. Universidad Nacional de Córdoba. Facultad de Psicología; ArgentinaFil: Albretch, Paula Alejandra. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Departamento de Farmacología; ArgentinaFil: Deza Ponzio, Romina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Farmacología Experimental de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Farmacología Experimental de Córdoba; Argentina. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Departamento de Farmacología; ArgentinaFil: Virgolini, Miriam Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Farmacología Experimental de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Farmacología Experimental de Córdoba; Argentina. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Departamento de Farmacología; ArgentinaFil: Molina, Juan Carlos. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigación Médica Mercedes y Martín Ferreyra. Universidad Nacional de Córdoba. Instituto de Investigación Médica Mercedes y Martín Ferreyra; Argentina. Universidad Nacional de Córdoba. Facultad de Psicología; ArgentinaIX International Meeting of the Latin American Society for Biomedical Research on Alcoholism (LASBRA): Determinants of Alcoholism: Bridging the gap between epidemiological and basic researchCórdobaArgentinaLatin American Society for Biomedical Research on Alcoholis

Empirical tests to developmental formulations: a study centered in modelling a covariance structure

Esse estudo pretende ilustrar diferentes possibilidades de análise de dados longitudinais associados à noção de desenvolvimento. Partindo da metodologia de análise de estruturas de covariância, são apresentendos três modelos de alcance interpretativo distinto para testar a noção de desenvolvimento no contexto de um componente da aptidão física - a flexibilidade. Os modelos são o quasi-simplex autoregressivo, o de Wiener e o das curvas de crescimento latente. Lançado o problema, apresenta-se a estrutura de cada modelo e o seu alcance. Os dados são analisados e interpretados no contexto de diferentes hipóteses desenvolvimentistas. Finalmente, é realçada a necessidade de modelação quantitativa do processo de desenvolvimento de cunho longitudinal no domínio motor. Esta pesquisa deve contemplar a idéia mestra da presença de testes alternativos a hipóteses competitivas para a mesma estrutura dos dados. O ganho substantivo será enormeThis study aims at the presentation of different methods for longitudinal data analysis linked to the idea of development. From the methodology of analysis of covariance structures we present three models to test the notion of development associated to a physical fitness component - flexibility. These models are - auto-regressive quasi-simplex, Wiener model, and the latent growth model. After the presentation of the problem, we introduce the main ideas of each model as well as richness of its structure. Data are analyzed and interpreted within the context of different developmental hypothesis. Finally, we stress the need for quantitative modelling to test developmental processes in longitudinal designs of motor development. This line of research should retain the idea of alternative testing to competitive hypothesis for the same data structure. This will result in a substantive gai

Leucosis bovina enzoótica

Enzootic bovine leucosis is a chronic, viral and contagious disease of adult cattle, with higher incidence in dairy production. It is characterized by asymptomatic presentations, persistent linfocitosis and linfosarcomatosis. Its importance lies in the limitations it causes for the export of livestock, semen and embryos, the direct and indirect economic losses, and in addition, this disease has recently begun to consider potentially a zoonotic one. The objective of this paper is to conduct a review of the knowledge about this disease, including progress on the different available diagnostic techniques.La leucosis bovina enzoótica es una enfermedad crónica, viral y contagiosa del ganado bovino adulto, con mayor prevalencia en la producción lechera. Se caracteriza por presentaciones asintomáticas, linfocitosis persistente y linfosarcomatosis. Su importancia radica en las limitaciones que ocasiona para la exportación de ganado, semen y embriones, las pérdidas económicas directas e indirectas y en que, recientemente, se ha comenzado a considerar enfermedad potencialmente zoonótica. El objetivo del presente trabajo fue realizar una revisión de los conocimientos sobre esta patología, incluyendo avances sobre las diferentes técnicas de diagnóstico disponibles

Cost-Effective Printed Electrodes Based on Emerging Materials Applied to Biosignal Acquisition

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