Primordial Nucleosynthesis: Accurate Predictions

A new accurate evaluation of primordial light nuclei abundances is presented. The proton to neutron conversion rates have been corrected to take into account radiative effects, finite nucleon mass, thermal and plasma corrections. The theoretical uncertainty on 4He is so reduced to the order of 0.1%.Comment: 4 pages, Talk given at the International Workshop on Particles in Astrophysics and Cosmology: From Theory to Observation, Valencia 199

On Simulating Neural Damage in Connectionist Networks

A key strength of connectionist modelling is its ability to simulate both intact cognition and the behavioural effects of neural damage. We survey the literature, showing that models have been damaged in a variety of ways, e.g. by removing connections, by adding noise to connection weights, by scaling weights, by removing units and by adding noise to unit activations. While these different implementations of damage have often been assumed to be behaviourally equivalent, some theorists have made aetiological claims that rest on nonequivalence. They suggest that related deficits with different aetiologies might be accounted for by different forms of damage within a single model. We present two case studies that explore the effects of different forms of damage in two influential connectionist models, each of which has been applied to explain neuropsychological deficits. Our results indicate that the effect of simulated damage can indeed be sensitive to the way in which damage is implemented, particularly when the environment comprises subsets of items that differ in their statistical properties, but such effects are sensitive to relatively subtle aspects of the model's training environment. We argue that, as a consequence, substantial methodological care is required if aetiological claims about simulated neural damage are to be justified, and conclude more generally that implementation assumptions, including those concerning simulated damage, must be fully explored when evaluating models of neurological deficits, both to avoid over-extending the explanatory power of specific implementations and to ensure that reported results are replicable. Electronic Supplementary Material: The online version of this article (10.1007/s42113-020-00081-z) contains supplementary material, which is available to authorized users

Perturbative QCD Correction to the Light-Cone Sum Rule for the B∗BπB^*B\pi and D∗DπD^*D\pi Couplings

The $B^*B\pi$ and $D^*D\pi$ couplings have previously been derived from a QCD light-cone sum rule in leading order. Here, we describe the calculation of the $O(\alpha_s)$ correction to the twist 2 term of this sum rule. The result is used for a first next-to-leading order analysis. We obtain $g_{B^*B\pi}= 22\pm 7$ and $g_{D^*D\pi}=10.5\pm 3$, where the error indicates the remaining theoretical uncertainty.Comment: 11 pages, 1 figure, Latex, epsfi

ΔπN\Delta\pi N coupling constant in light cone QCD sum rules

We employ the light cone QCD sum rules to calculate $\Delta\pi N$ coupling constant by studying the two point correlation function between the vacuum and the pion state. Our result is consistent with the traditional QCD sum rules calculations and it is in agreement with the experimental value.Comment: 8 pages, latex, 2 figure

Factores que se relacionan en la deserción de la suplementación con micronutrientes en madres de niños de 6 a 35 meses del valle de Canipaco I trimestre 2020

La administración de un micronutriente en la niñez, es parte de una intervención contra la lucha de la anemia infantil, conocida también como el hambre oculta, daño que afecta en forma significativa en el crecimiento y desarrollo; describir los factores que influyen en una suplementación, favorece para disminuir la deserción en la administración de micronutrientes. Objetivo: Conocer los factores que se relacionan en la deserción en la suplementación con micronutrientes en madres de niños y niñas de 6 a 35 meses del Valle de Canipaco en el I trimestre del 2020. Metodología: Estudio es de tipo cuantitativo, descriptivo, de corte transversal. Población: 98 madres de niños de 6 a 35 meses que asistieron a los establecimientos de salud del Valle del Canipaco durante el primer I trimestre 2020, para recibir la suplementación de micronutrientes en el programa de crecimiento y desarrollo. Muestra: 72 madres seleccionadas en forma aleatoria simple, muestra no probabilística. Resultado: Factores sociales, se comprueba que existe relación e influencia de significancia estadística entre la deserción y la aceptación del consumo de micronutrientes por parte de la familia, con un p valor de 0.02; factores relacionadas a la madre, se constata la relación con mayor influencia y significancia estadística entre la deserción y la confianza que tiene la madre en el micronutriente con el 0.0 de p valor; factores relacionados con el suplemento, se corrobora la relación y la influencia con significancia estadística, entre la deserción y la facilidad con la que se administra el micronutriente, con un 0.03 p valor; en los factores relacionados con el personal de enfermería, no se encuentra relación con la deserción. Conclusión: Existe relación e influencia de significancia estadística entre la deserción en la administración de los micronutrientes y los factores sociales, factores relacionados con la madre, factores relacionados con el suplemento; Por otro lado, estadísticamente no existe relación entre la deserción y los factores relacionados con el personal de enfermería.Tesi

Micropropagación de Actinidia chinensis Planch. (Kiwi). Optimización del medio de cultivo para la propagación clonal en gran escala

La micropropagación en escala comercial de kiwi (Actinidia chinensis Planch.) cv.Hayward fue posible a partir de la siembra de ápices extraídos de yemas dormidas.El establecimiento y crecimiento del explanto se logró con el cultivo en medio MS(1962). los compuestos orgánicos de Standards (1983),209. L-1 sacarosa, sin auxinasy con el agregado de 1 mg. L-1 de BAy 0,1 mg. L-1 de GA3. El empleo de ANA determinó la formación de un callo basal y el crecimiento anormal de la yema.La brotación de las yemas axilares se obtuvo con un medio compuesto por las sales de MS, los componentes orgánicos de Standards (1983) e idéntica composición de reguladores del crecimiento. En esta forma se obtuvieron 4-5 brotes por expíenlo cada 30 días, en condiciones de iniciar el enraizamiento. Esto se logró con la reducción al 50% de los macro-nutrientes de MS, IBA y PPZ, éstos últimos a razón de1 mg.L-1. El porcentaje de enraizamiento llegó al 95% al cabo de 30 días, con la producción de cerca de 1000 plantitas usticadas.Abreviaturas. ANA: ácido naft-1 -y lacético; BA: H-(fenilmetil)-1 H-purin-6-amina; GA3:ácido giberélico; IBA: ácido 1H-indol-3-butanoico; MS: medio de Murash

Positioning by multicell fingerprinting in urban NB-IoT networks

Narrowband Internet of Things (NB-IoT) has quickly become a leading technology in the deployment of IoT systems and services, owing to its appealing features in terms of coverage and energy efficiency, as well as compatibility with existing mobile networks. Increasingly, IoT services and applications require location information to be paired with data collected by devices; NB-IoT still lacks, however, reliable positioning methods. Time-based techniques inherited from long-term evolution (LTE) are not yet widely available in existing networks and are expected to perform poorly on NB-IoT signals due to their narrow bandwidth. This investigation proposes a set of strategies for NB-IoT positioning based on fingerprinting that use coverage and radio information from multiple cells. The proposed strategies were evaluated on two large-scale datasets made available under an open-source license that include experimental data from multiple NB-IoT operators in two large cities: Oslo, Norway, and Rome, Italy. Results showed that the proposed strategies, using a combination of coverage and radio information from multiple cells, outperform current state-of-the-art approaches based on single cell fingerprinting, with a minimum average positioning error of about 20 m when using data for a single operator that was consistent across the two datasets vs. about 70 m for the current state-of-the-art approaches. The combination of data from multiple operators and data smoothing further improved positioning accuracy, leading to a minimum average positioning error below 15 m in both urban environments

Adesmia horrida Gillies ex Hook. & Arn.

Valle del Río BonetepublishedVersio