The Generalized Riemann Zeta heat flow

We consider the PDE flow associated to Riemann zeta and general Dirichlet $L$-functions. These are models characterized by nonlinearities appearing in classical number theory problems, and generalizing the classical holomorphic Riemann flow studied by Broughan and Barnett. Each zero of a Dirichlet $L$-function is an exact solution of the model. In this paper, we first show local existence of bounded continuous solutions in the Duhamel sense to any Dirichlet $L$-function flow with initial condition far from the pole (as long as this exists). In a second result, we prove global existence in the case of nonlinearities of the form Dirichlet $L$-functions and data initially on the right of a possible pole. Additional global well-posedness and convergence results are proved in the case of the defocusing Riemann zeta nonlinearity and initial data located on the real line and close to the trivial zeros of the zeta. The asymptotic stability of any stable zero is also proved. Finally, in the Riemann zeta case, we consider the ``focusing'' model, and prove blow-up of solutions near the pole $s=1$.Comment: 33 p

Noticias falsas y creencias infundadas en la era de la posverdad

The dissemination of fake news embodies a pressing problem for democracy that is exacerbated by theubiquity of information available on the Internet and by the exploitation of those who, appealing to theemotionality of audiences, have capitalized on the injection of falsehoods into the social fabric. In thisstudy, through a cross-sectional, correlational and non-experimental design, the relationship betweencredibility in the face of fake news and some types of dysfunctional thoughts was explored in a sampleof Chilean university students. The results reveal that greater credibility in fake news is associated withhigher scores of magical, esoteric and naively optimistic thinking, beliefs that would be the meetingpoint for a series of cognitive biases that operate in the processing of information. The highest correlationis found with the paranormal beliefs facet and, particularly, with ideas about the laws of mentalattraction, telepathy and clairvoyance. Significant differences were also found in credibility in fake newsas a function of the gender of the participants, with the female gender scoring higher on average thanthe male gender. These findings highlight the need to promote critical thinking, skepticism and scientificattitude in all segments of society.La difusión de noticias falsas encarna un apremiante problema para la democracia que se ve agudizadopor la ubicuidad de la información disponible en el internet y por el aprovechamiento de quienes, apelandoa la emocionalidad de las audiencias, han capitalizado a su favor la inyección de falsedades en elentramado social. En este estudio a través de un diseño transversal, correlacional y no experimental seexploró la relación entre credibilidad frente a las noticias falsas y algunos tipos de pensamientos disfuncionales en una muestra de estudiantes universitarios chilenos. Los resultados develan que una mayorcredibilidad en noticias falsas va aparejada con mayores puntajes de pensamiento mágico, esotérico eingenuamente optimista, creencias que serían el punto de encuentro para una serie de sesgos cognitivosque operan en el procesamiento de la información. La correlación más alta se encuentra con la faceta decreencias paranormales y, particularmente, con las ideas acerca de las leyes de atracción mental, la telepatíay la clarividencia. También se hallaron diferencias significativas en la credibilidad en noticias falsasen función del género de los participantes, encontrando que el género femenino puntúa una media másalta que el género masculino. Estos hallazgos ponen en relieve la necesidad de promover el pensamientocrítico, el escepticismo y la actitud científica en todos los segmentos de la sociedad

DOT-WINGED CRAKE PORZANA SPILOPTERA (RALLIDAE; DURNFORD, 1877) IN CHILE: NEW RECORDS AND A REVIEW OF THE STATUS OF PACIFIC POPULATIONS

We report new records of the Dot-winged Crake Porzana spiloptera in southern Chile, an almost unknown species distributed mainly in Argentina and recently discovered in Chile. The occasional capture of a juvenile of the species at Cruces River wetland (39°S), and the analysis of sound recordings obtained to explore the acoustic attributes of urban wetland soundscapes, made it possible to discuss the status of the Pacific populations of the species. The new records show that P. spiloptera has a resident status and suggest that the presence of the species in Chile went historically unnoticed, and that it has been confused with the Black Rail Laterallus jamaicensis. Comprehensive surveys and dedicated research that provide fundamental biological aspects such as the current distribution, population abundance, habitat requirements, and main threats for these secretive rails are urgently needed for their conservation

Recomendaciones para la atención kinésica respiratoria en el contexto de paciente sospechoso y confirmado para Covid-19 en las unidades de Hospitalización Domiciliaria

PorpuseGiven the health crisis that the country and the world are currently experiencing, this document was prepared by the autonomous initiative of kinesiologists from twelve Hospital at Home units of public hospitals in Chile, in order to unify criteria based on their experiences and the available scientific evidence in order to carry out safe respiratory physiotherapy care in patients with suspected or confirmed COVID-19. In addition, this document is intended to be a guide for those who need to protocolize and / or standardize their care at Hospital at home, and can be adapted according to the need and availability of resources and infrastructure of each unit. It is important to note that this document may vary depending on the evolution of this pandemic and the updating of scientific evidence.ScopeThis document is designed to be applied in the home of adult and pediatric patients admitted to Hospital at Home Units (UHD) with suspected SARS-CoV-2 infection or with a positive result for COVID-19PropósitoAnte la crisis sanitaria que vive el país y el mundo actualmente, se confeccionó este documento por la iniciativa autónoma de kinesiólogos de doce unidades de Hospitalización Domiciliaria (HD) de hospitales públicos de Chile, con el fin de unificar criterios en base a sus experiencias y la evidencia científica disponible para poder realizar una atención kinésica respiratoria segura en pacientes con sospecha o confirmados para COVID-19. Además, este documento tiene el objetivo de ser una guía para quienes tengan la necesidad de protocolizar y/o estandarizar su atención en HD, pudiendo ser adaptado según la necesidad y disponibilidad de recursos e infraestructura de cada unidad. Es importante señalar, que este documento puede variar según la evolución de esta pandemia y la actualización de la evidencia científica.Campo de aplicaciónEste documento está diseñado para ser aplicado en el domicilio de los pacientes adultos y pediátricos ingresados a las Unidades de Hospitalización Domiciliaria (UHD) con sospecha de infección por SARS-CoV-2 o con resultado positivo para COVID-19

La izquierda latinoamericana en su laberinto : ¿entre el radicalismo y la moderación? Manejo de coaliciones y política económico-social en Chile, Bolivia y la Argentina, 2001-2009

La creciente literatura sobre el “giro a la izquierda” en América Latina ha dejado en un llamativo descuido el tratamiento de los factores políticos involucrados en la política económica de los gobiernos de la así llamada Nueva Izquierda latinoamericana. En este proyecto, sobre la base y la crítica de los escasos estudios sobre la temática, nos proponemos abordar la economía política de aquellos gobiernos a partir de una estrategia comparativa de tres casos que consideramos paradigmáticos: Chile, Argentina y Bolivia. Apoyándonos analíticamente en las nociones de coaliciones y de manejo de coaliciones, desarrollamos las hipótesis de que: 1) los gobiernos de la Nueva Izquierda responden a tres tipos diferentes según las características originales de su coalición de apoyo; 2) que los gobiernos tienden a implementar políticas económico-sociales compatibles con estas características cuya “cara izquierda” puede ser incompleta si tales características así lo exigen, y 3) que el mantenimiento, los cambios y eventual crisis de estas políticas se relaciona con los desequilibrios propios de cada tipo de gobierno y el intento de reequilibrio por parte de este a través del manejo -decisiones económicas y políticas orientadas a producir redistribuciones de recursos y a incentivar la continuidad o cambio de comportamientos económicos y políticos, respectivamente- de su coalición de apoyo. Con la guía de estas hipótesis procedemos, siguiendo la estrategia de process tracing, a la especificación de los mecanismos involucrados en los procesos de cada caso seleccionado con el fin de avanzar en el desarrollo de una teoría tipológica.Fil: Nazareno, Marcelo Gabriel. Universidad Católica de Córdoba. Facultad de Ciencia Política y Relaciones Internacionales; ArgentinaFil: Mazzalay, Víctor Hugo. Universidad Católica de Córdoba. Facultad de Ciencia Política y Relaciones Internacionales; Argentin

Mendelian Randomization Analysis of the Relationship Between Native American Ancestry and Gallbladder Cancer Risk

Background A strong association between the proportion of Native American ancestry and the risk of gallbladder cancer (GBC) has been reported in observational studies. Chileans show the highest incidence of GBC worldwide, and the Mapuche are the largest Native American people in Chile. We set out to investigate the causal association between Native American Mapuche ancestry and GBC risk, and the possible mediating effects of gallstone disease and body mass index (BMI) on this association. Methods Markers of Mapuche ancestry were selected based on the informativeness for assignment measure and then used as instrumental variables in two-sample mendelian randomization (MR) analyses and complementary sensitivity analyses. Result We found evidence of a causal effect of Mapuche ancestry on GBC risk (inverse variance-weighted (IVW) risk increase of 0.8% for every 1% increase in Mapuche ancestry proportion, 95% CI 0.4% to 1.2%, p = 6.6×10-5). Mapuche ancestry was also causally linked to gallstone disease (IVW risk increase of 3.6% per 1% increase in Mapuche proportion, 95% CI 3.1% to 4.0%, p = 1.0×10-59), suggesting a mediating effect of gallstones in the relationship between Mapuche ancestry and GBC. In contrast, the proportion of Mapuche ancestry showed a negative causal effect on BMI (IVW estimate -0.006 kg/m2 per 1% increase in Mapuche proportion, 95% CI -0.009 to -0.003, p = 4.4×10-5). Conclusions The results presented here may have significant implications for GBC prevention and are important for future admixture mapping studies. Given that the association between Mapuche ancestry and GBC risk previously noted in observational studies appears to be causal, primary and secondary prevention strategies that take into account the individual proportion of Mapuche ancestry could be particularly efficient

Rediseño de los procesos operacionales de gestión de los productos bancarios para reducir tiempo y costos en la entrega

Proyecto de grado para optar al grado de Magíster en Ingeniería de Negocios con Tecnologías de Información20 enero de 202

Conductive Copper-PMMA Nanocomposites: Microstructure, Electrical Behavior, and Percolation Threshold as a Function of Metal Filler Concentration

Artículo de publicación ISIThe copper-PMMA conductive composites were manufactured using different copper concentrations dispersed into the polymeric matrix by hot compression molding in inert atmosphere. The PMMA matrix was analyzed using dilute solution viscosimetry analysis and it did not evidence degradation in its molecular weight. The microstructure was examined by means of SEM and the electric conductivity was measured as a function of the concentration of copper particles in the polymer matrix. The 10 vol% copper composite presented conductivity between 11 and 13 orders of magnitude higher than that of pure PMMA. The experimental results are in agreement with the theoretical model considering the percolation path theory for a segregated structure

Characterization of Sonic Events Present in Natural-Urban Hybrid Habitats Using UMAP and SEDnet: The Case of the Urban Wetlands

We investigated whether the use of technological tools can effectively help in manipulating the increasing volume of audio data available through the use of long field recordings. We also explored whether we can address, by using these recordings and tools, audio data analysis, feature extraction and determine predominant patterns in the data. Similarly, we explored whether we can visualize feature clusters in the data and automatically detect sonic events. Our focus was primarily on enhancing the importance of natural-urban hybrid habitats within cities, which benefit communities in various ways, specifically through the natural soundscapes of these habitats that evoke memories and reinforce a sense of belonging for inhabitants. The loss of sonic heritage can be a precursor to the extinction of biodiversity within these habitats. By quantifying changes in the soundscape of these habitats over long periods of time, we can collect relevant information linked to this eventual loss. In this respect, we developed two approaches. The first was the comparison among habitats that progressively changed from natural to urban. The second was the optimization of the field recordings’ labeling process. This was performed with labels corresponding to the annotations of classes of sonic events and their respective start and end times, including events temporarily superimposed on one another. We compared three habitats over time by using their sonic characteristics collected in field conditions. Comparisons of sonic similarity or dissimilarity among patches were made based on the Jaccard coefficient and uniform manifold approximation and projection (UMAP). Our SEDnet model achieves a F1-score of 0.79 with error rate 0.377 and with the area under PSD-ROC curve of 71.0. In terms of computational efficiency, the model is able to detect sound events from an audio file in a time of 14.49 s. With these results, we confirm the usefulness of the methods used in this work for the process of labeling field recordings

Short-time acoustic indices for monitoring urban-natural environments using artificial neural networks

Urban-natural environments, proximal to rapidly urbanizing cities, provide essential ecosystem functions that benefit both city residents and ecological communities. With escalating urbanization, the resilience of these ecosystems is being progressively challenged, highlighting the need for robust monitoring mechanisms. Acoustic monitoring has emerged as an unobtrusive method to evaluate the status of these environments, capitalizing on indicators that reflect both landscape features and specific acoustic events. Despite potentially offering significant insights, this approach generates a large volume of acoustic data, introducing complexities in subsequent analyses. To mitigate this, we propose integrating artificial neural networks with acoustic indices to enhance data analysis. Our approach emphasizes the usefulness of short-time acoustic indices, computed over finite-duration analysis windows, to enhance polyphonic sound event detection accuracy. Empirical results support the performance of our approach, registering both an F1-Score and an error rate of 0.614. Overall, this study delineates a novel paradigm geared towards enhancing or preserving the biological diversity of urban-natural environments in areas with population growth and urban development