Parametrización de modelo de circuito equivalente de polarización dual de una celda de ion Litio utilizando la técnica de optimización por enjambre de partículas modificada.

Contexto: El modelado de baterías es una actividad que puede ser compleja si se utilizan técnicas basadas en el comportamiento químico, para facilitar esto se han utilizado estrategias de modelo inverso que se basan en curvas experimentales y ajustes de modelos circuitales. Para la parametrización se utilizan diferentes técnicas que radican en su complejidad, exactitud y tiempo de convergencia. Método: En este trabajo se utiliza un algoritmo de optimización por enjambre de partículas para la parametrización de un modelo de polarización dual para una celda de ion litio de tipo 18650. La metodología propuesta divide el problema en diferentes casos de optimización y propone una estrategia de búsqueda localizada basada en la experiencia del caso anterior. Resultados: El algoritmo PSO permite ajustar los parámetros del modelo para cada uno de los casos analizados. La división del problema por casos permite mejorar la precisión global del problema y a su vez disminuir los tiempos de convergencia del algoritmo. A partir de los posibles casos se puede encontrar la dinámica de cada uno de los parámetros en función del estado de carga. Conclusiones: La metodología propuesta permite reducir los tiempos de parametrización del modelo de polarización dual. Debido a la aproximación generada por las experiencias anteriores, es posible disminuir el número de la población del enjambre y disminuir aún más el tiempo de convergencia del proceso. Adicionalmente, la metodología puede ser utilizada con diferentes algoritmos de optimización

Parametrización de modelo de circuito equivalente de polarización dual de una celda de ion Litio utilizando la técnica de optimización por enjambre de partículas modificada.

Context: Battery modeling is an activity that can be complex if techniques based on chemical behavior are employed. Nowadays, there are other strategies to build the modeling as inverse modeling based on experimental curves and adjustments of circuit models. There are different techniques to parameterize the battery modeling based on their complexity, accuracy, and convergence time. Method: In this paper is used a particle swarm optimization algorithm to parameterize a dual-polarization model for a 18650-lithium cell. The proposed methodology divides the problem into different optimization cases and proposes a localized search strategy based on the experience of the previous particle. Results: The PSO algorithm allows adjusting the model parameters for each case analyzed. Problem division by stages allows improving the global precision while reducing the convergence times of the algorithm. From possible cases, it is possible to find the dynamics of each of the parameters as a function of the state of charge. Conclusions: The proposed methodology allows reducing the parameterization times of the dual-polarization model. Due to the approximation generated by the previous experiences, it is possible to decrease the number of the swarm population and further decrease the convergence time of the process. Additionally, the methodology can be used with different optimization algorithms.Contexto: El modelado de baterías es una actividad que puede ser compleja si se utilizan técnicas basadas en el comportamiento químico, para facilitar esto se han utilizado estrategias de modelo inverso que se basan en curvas experimentales y ajustes de modelos circuitales. Para la parametrización se utilizan diferentes técnicas que radican en su complejidad, exactitud y tiempo de convergencia. Método: En este trabajo se utiliza un algoritmo de optimización por enjambre de partículas para la parametrización de un modelo de polarización dual para una celda de ion litio de tipo 18650. La metodología propuesta divide el problema en diferentes casos de optimización y propone una estrategia de búsqueda localizada basada en la experiencia del caso anterior. Resultados: El algoritmo PSO permite ajustar los parámetros del modelo para cada uno de los casos analizados. La división del problema por casos permite mejorar la precisión global del problema y a su vez disminuir los tiempos de convergencia del algoritmo. A partir de los posibles casos se puede encontrar la dinámica de cada uno de los parámetros en función del estado de carga. Conclusiones: La metodología propuesta permite reducir los tiempos de parametrización del modelo de polarización dual. Debido a la aproximación generada por las experiencias anteriores, es posible disminuir el número de la población del enjambre y disminuir aún más el tiempo de convergencia del proceso. Adicionalmente, la metodología puede ser utilizada con diferentes algoritmos de optimización

Search for dark matter produced in association with bottom or top quarks in √s = 13 TeV pp collisions with the ATLAS detector

A search for weakly interacting massive particle dark matter produced in association with bottom or top quarks is presented. Final states containing third-generation quarks and miss- ing transverse momentum are considered. The analysis uses 36.1 fb−1 of proton–proton collision data recorded by the ATLAS experiment at √s = 13 TeV in 2015 and 2016. No significant excess of events above the estimated backgrounds is observed. The results are in- terpreted in the framework of simplified models of spin-0 dark-matter mediators. For colour- neutral spin-0 mediators produced in association with top quarks and decaying into a pair of dark-matter particles, mediator masses below 50 GeV are excluded assuming a dark-matter candidate mass of 1 GeV and unitary couplings. For scalar and pseudoscalar mediators produced in association with bottom quarks, the search sets limits on the production cross- section of 300 times the predicted rate for mediators with masses between 10 and 50 GeV and assuming a dark-matter mass of 1 GeV and unitary coupling. Constraints on colour- charged scalar simplified models are also presented. Assuming a dark-matter particle mass of 35 GeV, mediator particles with mass below 1.1 TeV are excluded for couplings yielding a dark-matter relic density consistent with measurements

Combinations of single-top-quark production cross-section measurements and vertical bar f(LV)V(tb)vertical bar determinations at root s=7 and 8 TeV with the ATLAS and CMS experiments

This paper presents the combinations of single-top-quark production cross-section measurements by the ATLAS and CMS Collaborations, using data from LHC proton-proton collisions at = 7 and 8 TeV corresponding to integrated luminosities of 1.17 to 5.1 fb(-1) at = 7 TeV and 12.2 to 20.3 fb(-1) at = 8 TeV. These combinations are performed per centre-of-mass energy and for each production mode: t-channel, tW, and s-channel. The combined t-channel cross-sections are 67.5 +/- 5.7 pb and 87.7 +/- 5.8 pb at = 7 and 8 TeV respectively. The combined tW cross-sections are 16.3 +/- 4.1 pb and 23.1 +/- 3.6 pb at = 7 and 8 TeV respectively. For the s-channel cross-section, the combination yields 4.9 +/- 1.4 pb at = 8 TeV. The square of the magnitude of the CKM matrix element V-tb multiplied by a form factor f(LV) is determined for each production mode and centre-of-mass energy, using the ratio of the measured cross-section to its theoretical prediction. It is assumed that the top-quark-related CKM matrix elements obey the relation |V-td|, |V-ts| << |V-tb|. All the |f(LV)V(tb)|(2) determinations, extracted from individual ratios at = 7 and 8 TeV, are combined, resulting in |f(LV)V(tb)| = 1.02 +/- 0.04 (meas.) +/- 0.02 (theo.). All combined measurements are consistent with their corresponding Standard Model predictions.Peer reviewe

Guidelines for the use and interpretation of assays for monitoring autophagy (4th edition)1.

In 2008, we published the first set of guidelines for standardizing research in autophagy. Since then, this topic has received increasing attention, and many scientists have entered the field. Our knowledge base and relevant new technologies have also been expanding. Thus, it is important to formulate on a regular basis updated guidelines for monitoring autophagy in different organisms. Despite numerous reviews, there continues to be confusion regarding acceptable methods to evaluate autophagy, especially in multicellular eukaryotes. Here, we present a set of guidelines for investigators to select and interpret methods to examine autophagy and related processes, and for reviewers to provide realistic and reasonable critiques of reports that are focused on these processes. These guidelines are not meant to be a dogmatic set of rules, because the appropriateness of any assay largely depends on the question being asked and the system being used. Moreover, no individual assay is perfect for every situation, calling for the use of multiple techniques to properly monitor autophagy in each experimental setting. Finally, several core components of the autophagy machinery have been implicated in distinct autophagic processes (canonical and noncanonical autophagy), implying that genetic approaches to block autophagy should rely on targeting two or more autophagy-related genes that ideally participate in distinct steps of the pathway. Along similar lines, because multiple proteins involved in autophagy also regulate other cellular pathways including apoptosis, not all of them can be used as a specific marker for bona fide autophagic responses. Here, we critically discuss current methods of assessing autophagy and the information they can, or cannot, provide. Our ultimate goal is to encourage intellectual and technical innovation in the field

XVI International Congress of Control Electronics and Telecommunications: "Techno-scientific considerations for a post-pandemic world intensive in knowledge, innovation and sustainable local development"

Este título, sugestivo por los impactos durante la situación de la Covid 19 en el mundo, y que en Colombia lastimosamente han sido muy críticos, permiten asumir la obligada superación de tensiones sociales, políticas, y económicas; pero sobre todo científicas y tecnológicas. Inicialmente, esto supone la existencia de una capacidad de la sociedad colombiana por recuperar su estado inicial después de que haya cesado la perturbación a la que fue sometida por la catastrófica pandemia, y superar ese anterior estado de cosas ya que se encontraban -y aún se encuentran- muchos problemas locales mal resueltos, medianamente resueltos, y muchos sin resolver: es decir, habrá que rediseñar y fortalecer una probada resiliencia social existente - producto del prolongado conflicto social colombiano superado parcialmente por un proceso de paz exitoso - desde la tecnociencia local; como lo indicaba Markus Brunnermeier - economista alemán y catedrático de economía de la Universidad de Princeton- en su libro The Resilient Society…La cuestión no es preveerlo todo sino poder reaccionar…aprender a recuperarse rápido.This title, suggestive of the impacts during the Covid 19 situation in the world, and which have unfortunately been very critical in Colombia, allows us to assume the obligatory overcoming of social, political, and economic tensions; but above all scientific and technological. Initially, this supposes the existence of a capacity of Colombian society to recover its initial state after the disturbance to which it was subjected by the catastrophic pandemic has ceased, and to overcome that previous state of affairs since it was found -and still is find - many local problems poorly resolved, moderately resolved, and many unresolved: that is, an existing social resilience test will have to be redesigned and strengthened - product of the prolonged Colombian social conflict partially overcome by a successful peace process - from local technoscience; As Markus Brunnermeier - German economist and professor of economics at Princeton University - indicates in his book The Resilient Society...The question is not to foresee everything but to be able to react...learn to recover quickly.Bogot