Current constraints on the EFT for the \Lambda N --> N N transition

The relation between the low energy constants appearing in the effective field theory description of the \Lambda N --> N N transition potential and the parameters of the one-meson-exchange model previously developed are obtained. We extract the relative importance of the different exchange mechanisms included in the meson picture by means of a comparison to the corresponding operational structures appearing in the effective approach. The ability of this procedure to obtain the weak baryon-baryon-meson couplings for a possible scalar exchange is also discussed.Comment: 10 pages, 6 figure

Funciones discursivas de las oraciones existenciales en español

En algunas oraciones existenciales del español se observa cierta alternancia entre el carácter definido o indefinido de la frase nominal referida a la entidad existente. El verbo existencial prototípico haber, en contraste con otros existenciales, difícilmente participa de esta cualidad, a partir de lo que se observa una función discursiva presentativa específica de este verbo, la de introducir preponderantemente entidades nuevas en el discurso, función que lo distingue en términos semánticos y pragmáticos del resto de los verbos existenciales. En este trabajo se ofrece una explicación sobre las diferencias que subyacen a la alternancia de entidades existentes definidas o indefinidas en oraciones existenciales en relación con los conceptos tópico y foco. El análisis se basa en un corpus diacrónico constituido por estructuras pertenecientes al periodo comprendido entre los siglos XIII y XX

Estudio de viabilidad para un centro de carga a base de generación eólica para zonas de difícil acceso en la región atlántica de Nicaragua.

Presenta un estudio de viabilidad para un centro de carga en el orden de los Kwatts a base de energía eólica que permita satisfacer la demanda energética en la ciudad de Bilwi Puerto Cabezas, Región Autónoma del Atlántico Norte

Discrepancy Between LGE-MRI and Electro-Anatomical Mapping for Regional Detection of Pathological Atrial Substrate

Atrial fibrillation (AF) is the most common sustained arrhythmia posing a significant burden to patients and leading to an increased risk of stroke and heart failure. Additional ablation of areas of arrhythmogenic substrate in the atrial body detected by either late gadolinium enhancement magnetic resonance imaging (LGE-MRI) or electroanatomical mapping (EAM) may increase the success rate of restoring and maintaining sinus rhythm compared to the standard treatment procedure of pulmonary vein isolation (PVI). To evaluate if LGE-MRI and EAM identify equivalent substrate as potential ablation targets, we divided the left atrium (LA) into six clinically important regions in ten patients. Then, we computed the correlation between both modalities by analyzing the regional extents of identified pathological tissue. In this regional analysis, we observed no correlation between late gadolinium enhancement (LGE) and low voltage areas (LVA), neither in any region nor with regard to the entire atrial surface (-0.3<r<0.3). Instead, the regional extents identified as pathological tissue varied significantly between both modalities. An increased extent of LVA compared to LGE was observed in the septal wall of the LA ($\tilde{a}_{sept}.,_{LVA}$= 19.63% and $\tilde{a}_{sept.,LGE}$= 3.94%, with = median of the extent of pathological tissue in the corresponding region). In contrast, in the inferior and lateral wall, the extent of LGE was higher than the extent of LVA for most geometries ($\tilde{a}_{inf.,LGE}$= 27.22% and $\tilde{a}_{lat.,LGE}$= 32.70% compared to $\tilde{a}_{inf.,LVA}$= 9.21% and $\tilde{a}_{lat.,LVA}$= 6.69%). Since both modalities provided discrepant results regarding the detection of arrhythmogenic substrate using clinically established thresholds, further investigations regarding their constraints need to be performed in order to use these modalities for patient stratification and treatment planning

Aplicación de sistemas de representación para mejorar el aprendizaje del área y del volumen

La geometría, por ser la rama de la matemática que permite un puente entre lo concreto y lo abstracto, busca acercar al estudiante con su entorno dándole un carácter de utilidad a través de la medición; lo que no se ha fortalecido en las escuelas, minimizando su enseñanza a la memorización y aplicación de fórmulas. Esto se evidencia en la falta de comprensión sobre las magnitudes y su medición a lo que específicamente hace referencia el pensamiento métrico. La presente propuesta de innovación aplicada en 9o, tiene como propósito describir el mejoramiento en el aprendizaje del área y el volumen a través de la aplicación de sistemas de representación de Bruner (el enactivo, el icónico y el simbólico) los cuales utiliza el ser humano para representar su realidad. Se utilizó un enfoque de investigación cuantitativo, complementado con un componente cualitativo en el análisis de la entrevista, un tipo de investigación descriptivo y un diseño de investigación pre experimental de pre prueba – pos prueba con un solo grupo de 35 estudiantes. Principales resultados: • El objetivo general de mejorar el aprendizaje del área y del volumen se alcanzó totalmente, ya que cada uno de los objetivos específicos mejoraron en un rango del 14,3% al 62,9%. • Con respecto a la valoración de la metodología por parte de los alumnos, esta varía del 62,8% al 100%, siendo el aspecto más valorado (100%) el material utilizado, seguido del agrado por la metodología (94,2%), y las estrategias de evaluación (91,4%)

Not All Lies Are Equal. A Study Into the Engineering of Political Misinformation in the 2016 US Presidential Election

We investigated whether and how political misinformation is engineered using a dataset of four months worth of tweets related to the 2016 presidential election in the United States. The data contained tweets that achieved a signi cant level of exposure and was manually labelled into misinformation and regular information. We found that misinformation was produced by accounts that exhibit different characteristics and behaviour from regular accounts. Moreover, the content of misinformation is more novel, polarised and appears to change through coordination. Our ndings suggest that engineering of political misinformation seems to exploit human traits such as reciprocity and con rmation bias. We argue that investigating how misinformation is created is essential to understand human biases, diffusion and ultimately better produce public policy.The work of M. Molina-Solana was supported by the European Commission under Grant 743623. The work of J. Amador Díaz López was supported by the Imperial College Research Fellowship. The work of J. Gómez-Romero was supported by the Universidad de Granada under Grant P9-2014-ING and in part by the Spanish Ministry of Education, Culture and Sport under the José Castillejo Research Stays Programme

Personalized Modeling of Atrial Activation and P-waves: a Comparison Between Invasive and Non-Invasive Cardiac Mapping

Biatrial personalized models incorporating functional and anatomical features are becoming a promising tool for planning therapy for patients with atrial fibrillation (AF). Conduction velocity (CV) is one of the main features to be matched during the process of functional personalization, as it can identify electrical abnormalities in the cardiac tissue. The spatial distribution of CV can be estimated from local activation times (LAT) maps from non-invasive electrocardiographic imaging (ECGI) or invasive electroanatomical mapping systems (EAMS). We investigated the effect of using either invasive LAT maps from EAMS or non-invasive LAT maps from ECGI to personalize two biatrial models by comparing the virtual P-waves obtained from these LAT maps with the measured P-waves from the surface electrocardiogram (ECG). For both modalities – ECGI and EAMS – we found a qualitative match between simulated and measured P-waves but observed quantitative differences. The root-mean-square error (RMSE) between measured and simulated signals for patient A was 0.26±0.11 mV and 0.38±0.31 mV, while for patient B it was 0.21±0.09 mV and 0.14±0.05 mV for EAMS and ECGI, respectively. The correlation between measured and simulated signals from ECGI and EAMS was 0.69±0.34 and 0.71±0.26 for patient A and 0.71±0.18 and 0.72±0.18 for patient B. Our results suggest that LAT maps from ECGI and EAMS show differences, which are also reflected in the computed P-wave on the body surface