A Note on T-dualities in the Pure Spinor Heterotic String

In this note we study the preservation of the classical pure spinor BRST constraints under super T-duality transformations. We also determine the invariance of the one-loop conformal invariance and of the local gauge and Lorentz anomalies under the super T-dualities.Comment: References adde

Relación de la escala de intensidad de Mercalli y la información instrumental como una tarea de clasificación de patrones

A pesar de los progresos ocurridos en la instrumentación sísmica, la valoración de vulnerabilidad sísmica y el daño con índices cualitativos, tal como los proporcionados por Intensidad de Mercalli Modificada (IMM), siguen siendo altamente favorables y útiles para los propósitos prácticos. Para vincular las medidas cualitativas de acción del terremoto y sus efectos, es habitualmente aplicada la regresión estadística. En este artículo, se adopta un planteamiento diferente, el cual consiste en expresar la Intensidad de Mercalli, como una clase en vez de un valor numérico. Una herramienta de clasificación estadística moderna, conocida como máquina de vectores de soporte, se usa para clasificar la información instrumental con el fin de evaluar la intensidad de Mercalli correspondiente. Se muestra que el método da resultados satisfactorios con respecto a las altas incertidumbres y a la medida del daño sísmico cualitativo

Phase diagram of silicon from atomistic simulations

In this letter we present a calculation of the temperature-pressure phase diagram of Si in a range of pressures covering from -5 to 20 GPa and temperatures up to the melting point. The phase boundaries and triple points between the diamond, liquid, $\beta$-Sn and ${Si}_{34}$ clathrate phases are reported. We have employed efficient simulation techniques to calculate free energies and to numerically integrate the Clausius-Clapeyron equation, combined with a tight binding model capable of an accuracy comparable to that of first-principles methods. The resulting phase diagram agrees well with the available experimental data.Comment: 5 pages, 1 figure, accepted in PR

Special issue: Innovations in farming systems approaches: Introduction

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Primer reporte del género Cryptocheiridium (pseudoscorpiones: cheiridiidae: cheiridiinae) en Colombia

The pseudoscorpion genus Cryptocheiridium Chamberlin, 1931 is reported for the first time in Colombia, is described as new species Cryptocheiridium mairae sp. nov., in northwestern Colombia, associated with debris produced by the leafcutter ant Atta colombica Guérin-Méneville, 1844.El género de pseudoescorpion Cryptocheiridium Chamberlin, 1931 es reportado por primera vez en Colombia, es descrita como nueva especie Cryptocheiridium mairae sp. nov., del noroccidente colombiano, asociada a detritos de hormigas Atta colombica Guérin-Méneville, 1844

Voces de mujeres y mujeres diversas en la Biblioteca Pública La Victoria

In Public Libraries, the memory of the women-in particular diverse women-is a vital element to the collective construction of the localidentity. There for, women voices are a very important historical element in the time of the change, especially in this moment when the country is building a peace process. That is why, orality is the symbol of the liberty, equality and autonomy; thus, the library is a meeting place and a rights scenario, because the people to the fourth location of Bogotá (San Cristóbal), need to build speeches from the women and diverse women -victims or not of the violence-, and to use the knowledge in a social perspective of transformation. This is the point from The Public Library La Victoria and other social actors, (for instance District Women's Secretariat and Collective Archipiélago), are together in a work plan, trying to change the reality of the women and the diverse women in the territory; thorough reading, writing, culture, exchange of knowledge, debates and other participation mechanisms from the library as such. This experience show the work that library had done since 2015, in order to get that women and thediverse women empower themselves, using their voice to build local memory

C60-based hot-electron magnetic tunnel transistor

A C 60-based magnetic tunnel transistor is presented. The device is based on the collection of spin-filtered hot-electrons at a metal/C 60 interface, and it allows an accurate measurement of the energy level alignment at such interface. A 89% change in the collected current under the application of a magnetic field demonstrates that these devices can be used as sensitive magnetic field sensors compatible with soft electronics.Fil: Gobbi, M.. No especifíca;Fil: Bedoya Pinto, A.. No especifíca;Fil: Golmar, Federico. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Llopis, R.. No especifíca;Fil: Casanova, F.. No especifíca;Fil: Hueso, L. E.. No especifíca

The Role of Nitric Oxide in Stem Cell Biology

Nitric oxide (NO) is a gaseous biomolecule endogenously synthesized with an essential role in embryonic development and several physiological functions, such as regulating mitochondrial respiration and modulation of the immune response. The dual role of NO in embryonic stem cells (ESCs) has been previously reported, preserving pluripotency and cell survival or inducing differentiation with a dose-dependent pattern. In this line, high doses of NO have been used in vitro cultures to induce focused differentiation toward different cell lineages being a key molecule in the regenerative medicine field. Moreover, optimal conditions to promote pluripotency in vitro are essential for their use in advanced therapies. In this sense, the molecular mechanisms underlying stemness regulation by NO have been studied intensively over the current years. Recently, we have reported the role of low NO as a hypoxia-like inducer in pluripotent stem cells (PSCs), which supports using this molecule to maintain pluripotency under normoxic conditions. In this review, we stress the role of NO levels on stem cells (SCs) fate as a new approach for potential cell therapy strategies. Furthermore, we highlight the recent uses of NO in regenerative medicine due to their properties regulating SCs biology

Análisis de ciclo de vida de una nueva solución arquitectónica que mejora el rendimiento térmico de la envolvente del edificio: Fachada Natural Aljibe

The objective of this work, that improves the enclosure’s thermal performance of the building, is to divulge the environmental impacts tied to a new solution of vegetated façade by means of the Life Cycle Assessment methodology with a cradle to grave system boundary. The analysis aims also at generating relevant information of the life cycle as base material for drafting a future Environmental Product Declaration. The façade’s component manufacture stage is the one presenting the highest contribution for all the analysed impact categories, with the vegetated layer being the one with the greatest impact. Conversely, the transport stage is the one presenting the least contribution, and can be considered negligible for all the analysed impact categories. Following the analysis of the results, we have obtained useful information about the most problematic aspects and components in the assessed façade’s performance, thus paving the way towards possible actions of impact reduction by the manufacturer.El objetivo de este trabajo, que supone la mejora del rendimiento térmico de la envolvente del edificio, es dar a conocer los impactos ambientales asociados a una nueva solución de fachada vegetada mediante la metodología de Análisis de Ciclo de Vida con límites del sistema de la cuna a la tumba. El análisis pretende también generar información relevante de ciclo de vida como material de partida para la redacción de una futura Declaración Ambiental de Producto. La etapa de fabricación de los componentes de la fachada es la que más contribución presenta en todas las categorías de impacto analizadas, siendo la capa vegetada la de mayor impacto. En cambio, la etapa de transporte es la que presenta menor contribución, pudiendo ser considerado despreciable para todas las categorías de impacto analizadas. Tras el análisis de los resultados, se ha obtenido información útil de los aspectos y componentes más problemáticos en el desempeño ambiental de la fachada evaluada, abriendo el camino hacia posibles acciones de reducción de impactos por parte del fabricante