Slow ionized wind and rotating disklike system associated with the high-mass young stellar object G345.4938+01.4677

We report the detection, made using ALMA, of the 92 GHz continuum and hydrogen recombination lines (HRLs) H40$\alpha$, H42$\alpha$, and H50$\beta$ emission toward the ionized wind associated with the high-mass young stellar object G345.4938+01.4677. This is the luminous central dominating source located in the massive and dense molecular clump associated with IRAS 16562$-$3959. The HRLs exhibit Voigt profiles, a strong signature of Stark broadening. We successfully reproduce the observed continuum and HRLs simultaneously using a simple model of a slow ionized wind in local thermodynamic equilibrium, with no need a high-velocity component. The Lorentzian line wings imply electron densities of $5\times10^7$ cm$^{-3}$ on average. In addition, we detect SO and SO$_2$ emission arising from a compact ($\sim3000$ AU) molecular core associated with the central young star. The molecular core exhibits a velocity gradient perpendicular to the jet-axis, which we interpret as evidence of rotation. The set of observations toward G345.4938+01.4677 are consistent with it being a young high-mass star associated with a slow photo-ionized wind.Comment: (Accepted by ApJ

Estado del arte del proyecto

Una de las formas de lograr esa optimización en el transporte es a partir de la utilización de modelos basados en el problema de ruteo vehicular (VRP) el cual se centra en la disminución de la distancia total recorrida por una flota de vehículos. Este modelo presenta variantes como CVRP, donde cada vehículo está limitado por su capacidad en la cantidad de carga que puede transportar; o VRP con ventanas de tiempo (VRPTW) donde los clientes deben ser visitados dentro de franjas horarias predefinidas (Bektaş & Laporte, 2011). A pesar de esto estos modelos no se han desarrollado para dar respuestas que integren todas las variables que influyen en el transporte como la congestión. Autores como (Andrés Figliozzi, 2012) sostienen que este fenómeno crea una variación sustancial en las velocidades de viaje durante las horas pico, lo que genera tiempos de viaje prolongados, mayor consumo de combustible y aumento de las emisiones, además, crea una problemática para los modelos de enrutamiento existentes, ya que estos dependen de un valor constante para representar las velocidades del vehículo lo cual resulta en soluciones ineficientes. En Colombia el transporte urbano de mercancías aborda una serie de objetivos para la sustentabilidad y la prosperidad económica de las regiones, estos objetivos tienen en cuenta el flujo de abastecimiento y distribución de alimentos y bebidas a los centros de consumo, bodegas o almacenes tanto mayorista como minorista. Para el caso de las cadenas de supermercados, predomina el tener puntos de venta en varias ubicaciones dentro de la ciudad o de la región que comparten una marca y administración central. Algunas de estas cadenas de tiendas funcionan las 24 horas, los 365 días del año, por lo que necesita un sistema de abastecimiento dinámico y casi constante en sus estanterías para el público. Según la superintendencia de industria y comercio, el mercado de retail (venta al por menor) lo conforman los grandes hipermercados y almacenes de cadena que ofrecen a los consumidores las diversas categorías de productos. Los retail con mayor participación en el mercado colombiano, son del Grupo Empresarial Éxito y Olímpica. Estas cadenas de supermercados se enfrentan a las mismas situaciones de mantenimiento de sus niveles de stock para la satisfacción de la demanda requerida por su clientela afectando la movilidad y la calidad de vida de las personas ya que cuentan con 1414 puntos de venta en el país. (Sectorial, 2017). Esta situación ha generado diferentes estrategias, entre ellas se encuentran la distribución nocturna de mercancías (Holguín-Veras, 2008), la optimización de la capacidad de los vehículos y el uso de carriles multiuso, entre otros. (Antún, 2013). La mayoría de estas estrategias giran en torno a la movilidad sostenible y están enlazada con la aplicabilidad de la eco eficiencia; que según (Sustainability; & Ethos, 2002) mejora de los procedimientos ambientales supone la obtención del mismo nivel de producción con menos recursos, emisiones y desechos. Para el caso de la ciudad de Barranquilla y su área metropolitana, se ha detectado oportunidad de mejora en la forma como se administra el transporte de carga para las principales cadenas de supermercado, los cuales realizan recorridos hacia distintos nodos dentro de la ciudad de manera que se pueda satisfacer el requerimiento de abastecimiento y mantenimiento de su “stock”, comenzando en el depósito o centro de distribución y luego realizando entregas a un conjunto de clientes (puntos de venta) dentro de un límite de tiempo especificado previamente, para luego regresar al CEDI. Esto se traduce en un problema real de mejora de la eficiencia del suministro en un ambiente urbano que presenta de congestión, pero sobre todo que debe tener cuenta el consumo energético, las emisiones generadas y el costo, para dar una respuesta equilibrada y ajustada a la realidad

The Casualty Stabilization–Transportation Problem in a Large-Scale Disaster

We address the problem of picking up, stabilizing, and transporting casualties in response to mass-injury disasters. Our proposed methodology establishes the itinerary for collecting, on-site stabilization, and transporting victims considering capacitated vehicles and medical care centers. Unlike previous works, we minimize the time required to achieve on-site stabilization of each victim according to his age and level of severity of the injuries for their subsequent transfer to specialized medical centers. Thus, more critical patients will be the first to be stabilized, maximizing their chances of survival. In our methodology, the victims’ age, the injuries’ severity level, and their deterioration over time are considered critical factors in prioritizing care for each victim. We tested our approach using simulated earthquake scenarios in the city of Iquique, Chile, with multiple injuries. The results show that explicitly considering the on-site stabilization of the vital functions of the prioritized victims as an objective, before their transfer to a specialized medical center, allows treating and stabilizing patients earlier than with traditional objectives

Outlier Vehicle Trajectory Detection Using Deep Autoencoders in Santiago, Chile

In the last decade, a large amount of data from vehicle location sensors has been generated due to the massification of GPS systems to track them. This is because these sensors usually include multiple variables such as position, speed, angular position of the vehicle, etc., and, furthermore, they are also usually recorded in very short time intervals. On the other hand, routes are often generated so that they do not correspond to reality, due to artifacts such as buildings, bridges, or sensor failures and where, due to the large amount of data, visual analysis of human expert is unable to detect genuinely anomalous routes. The presence of such abnormalities can lead to faulty sensors being detected which may allow sensor replacement to reliably track the vehicle. However, given the reliability of the available sensors, there are very few examples of such anomalies, which can make it difficult to apply supervised learning techniques. In this work we propose the use of unsupervised deep neural network models based on stacked autoencoders to detect anomalous routes in vehicles within Santiago de Chile. The results show that the proposed model is capable of effectively detecting anomalous paths in real data considering validation given by an expert user, reaching a performance of 82.1% on average. As future work, we propose to incorporate the use of Long Short-Term Memory (LSTM) and attention-based networks in order to improve the detection of anomalous trajectories

Poems syndrome: review of a case Síndrome de Poems: revisión a propósito de un caso.

POEMS (acronym for polyneuropathy, organomegaly, endocrinopathy, M protein and skin changes) is a very rare syndrome probably related to plasma cell dyscrasia. A 43 year old man developed a progressive symmetric sensory motor polyneuropathy 2 years before admission. Hepatosplenomegaly and sclerodermatoid skin changes were present on physical examination. A sclerotic lesion of the right femur was disclosed by radiologic examination. Serum immunoelectrophoresis demonstrated a monoclonal protein IgG-lambda pattern and the bone marrow biopsy revealed an increased plasma cell count (15%). The patient died 7 months after admission from pneumonia. A review of the literature is included

FPGA-based digital signal processing for the next generation radio astronomy instruments: ultra-pure sideband separation and polarization detection

Field Programmable Gate Arrays (FPGAs) capacity and Analog to Digital Converters (ADCs) speed have largely increased in the last decade. Nowadays we can find one million or more logic blocks (slices) as well as several thousand arithmetic units (ALUs/DSP) available on a single FPGA chip. We can also commercially procure ADC chips reaching 10 GSPS, with 8 bits resolution or more. This unprecedented power of computing hardware has allowed the digitalization of signal processes traditionally performed by analog components. In radio astronomy, the clearest example has been the development of digital sideband separating receivers which, by replacing the IF hybrid and calibrating the system imbalances, have exhibited a sideband rejection above 40dB; this is 20 to 30dB higher than traditional analog sideband separating (2SB) receivers. In Rodriguez et al.,1 and Finger et al.,2 we have demonstrated very high digital sideband separation at 3mm and 1mm wavelengths, using laboratory setups. We here show the first implementation of such technique with a 3mm receiver integrated into a telescope, where the calibration was performed by quasi-optical injection of the test tone in front of the Cassegrain antenna. We also reported progress in digital polarization synthesis, particularly in the implementation of a calibrated Digital Ortho-Mode Transducer (DOMT) based on the Morgan et al. proof of concept.3 They showed off- line synthesis of polarization with isolation higher than 40dB. We plan to implement a digital polarimeter in a real-time FPGA-based (ROACH-2) platform, to show ultra-pure polarization isolation in a non-stop integrating spectrometer

The Slow Ionized Wind and Rotating Disklike System that are Associated with the High-Mass Young Stellar Object G345.4938+01.4677

We report the detection, made using ALMA, of the 92 GHz continuum and hydrogen recombination lines (HRLs) H40α, H42α, and H50β emission toward the ionized wind associated with the high-mass young stellar object G345.4938+01.4677. This is the luminous central dominating source located in the massive and dense molecular clump associated with IRAS 16562–3959. The HRLs exhibit Voigt profiles, which is a strong signature of Stark broadening. We successfully reproduce the observed continuum and HRLs simultaneously using a simple model of a slow ionized wind in local thermodynamic equilibrium, with no need for a high-velocity component. The Lorentzian line wings imply electron densities of $5 \times 10^7 cm^{–3}$ on average. In addition, we detect SO and $SO_2$ emission arising from a compact (~3000 AU) molecular core associated with the central young star. The molecular core exhibits a velocity gradient that is perpendicular to the jet-axis, which we interpret as evidence of rotation. The set of observations toward G345.4938+01.4677 are consistent with it being a young high-mass star associated with a slow photo-ionized wind.Astronom

Optimized corrugated tapered slot antenna for mm-Wave applications

We present a novel approach to design a high-performance tapered slot antenna (TSA) at millimeter-wave frequencies. Commonly, TSAs are designed using profiles expressed as simple functions (linear, exponential, Fermi, or constant width). Some improvement can be achieved by the use of corrugations of fixed dimensions. This usual approach, however, gives little room for improvement in their performance. To overcome this situation, we have developed a new approach: the use of a nonspecific profile and variable corrugations along the antenna, both of which can be optimized to considerably improve its performance. For the optimization, we have used a particle-swarm algorithm allowing us to achieve an excellent performance in the entire W-band. To demonstrate the efficiency of this new approach, we have implemented an optimized antenna using standard printed circuit board (PCB)-prototyping methods. Across the whole W-band, the constructed antenna shows sidelobe levels, reflection coefficient, and cross polarization below -16, -10, and -25 dB, respectively. These results are in good agreement with simulations which also predict possible operation down to 60 GHz. Finally, given its small footprint and the fact that it has been fed by a microstrip line, this antenna can be used in compact electronics providing excellent performance such as that required in radio astronomy or telecommunications.Quimal-CONICYT Fund N 140002 Fondecyt 1151022 ESO-Chile Joint Committee for Development of Astronomy Center of Excellence in Astrophysics and Associated Technologies PBF 0