Instalación de cinco estaciones para el monitoreo de cenizas volcánicas en el territorio argentino: Sistemas lidar

Se realiza una breve descripción de la evolución en equipamiento y aplicaciones de la tecnología Lidar en Argentina desde 1989. Se muestra el progreso de trabajos y proyectos, contando con el apoyo de instituciones nacionales como el Ministerio de Defensa, CEILAP, UNIDEF, CONICET, el Servicio Meteorológico Nacional y diversas universidades, así como la cooperación con agencias internacionales de Francia, Italia, Japón, Estados Unidos y Chile. A continuación se reseñan las mediciones atmosféricas realizadas en la ciudad de Buenos Aires de la pluma de cenizas producidas en abril de 2015 por acción del volcán Calbuco. Con el sistema lidar se pudo seguir la evolución espacial y temporal de dicha pluma, manteniendo informada de ella a la aeronavegación.A brief description since 1989 of equipment and applications evolution related to lidar technology in Argentina is made. Progress of works and projects is described, supported by national institutions: Ministerio de Defensa, CEILAP, UNIDEF, CONICET, Servicio Meteorológico Nacional and several universities. Supported too by cooperation with international agencies from France, Italy, Japan, USA and Chile. In addition atmospheric measurements of ashes plume on Buenos Aires City, due to Calbuco volcano action in april 2015, are shown. Spatial and temporal evolution of the plume was followed.Fil: Otero, Lidia Ana. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigaciones Científicas y Técnicas para la Defensa. Centro de Investigación en Láseres y Aplicaciones; ArgentinaFil: Ristori, Pablo Roberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigaciones Científicas y Técnicas para la Defensa. Centro de Investigación en Láseres y Aplicaciones; Argentina. Universidad Tecnológica Nacional; ArgentinaFil: Quel, Eduardo Jaime. Universidad Tecnológica Nacional; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigaciones Científicas y Técnicas para la Defensa. Centro de Investigación en Láseres y Aplicaciones; Argentin

Mobile resource management for better user experience: an audio case study

Ubiquitous environment's research has evolved considerably over the last years. The wide range of mobile devices, their high diversity and mobility have raised a variety of challenges being resource management a predominant, and therefore attracting special attention in the research community. The Composable-Adaptive Resource Management (CARM) middleware library provides a exi- ble infrastructure where personal devices create seamlessly on-demand interconnections links to share ubiquitous resources. In this paper we present a CARM interesting use case, consisting of an improved audio listening experience by sharing a high quality audio resource. A proof-of-concept implementation is provided, and a testbed comprised of two CARM enabled mobile phones with Bluetooth connectivity making use of remote device's audio resource is described. Our approach demonstrates the importance and usability of enhancing the dynamic resource sharing experience without altering the bandwidth efficiency.Peer ReviewedPostprint (author’s final draft

HuNavSim: A ROS 2 Human Navigation Simulator for Benchmarking Human-Aware Robot Navigation

This work presents the Human Navigation Simulator (HuNavSim), a novel open-source tool for the simulation of different human-agent navigation behaviors in scenarios with mobile robots. The tool, the first programmed under the ROS 2 framework, can be employed along with different well-known robotics simulators like Gazebo. The main goal is to ease the development and evaluation of human-aware robot navigation systems in simulation. Besides a general human-navigation model, HuNavSim includes, as a novelty, a rich set of individual and realistic human navigation behaviors and a complete set of metrics for social navigation benchmarking.Comment: Pre-print version of the paper submitted to the RA-L Journa

Tu no, pero tú sí. Y cómo el sector gastronómico incrementó sus ventas durante la emergencia sanitaria por la COVID-19 en la Ciudad de Xalapa, Veracruz.

Faced with the health contingency due to the COVID-19 outbreak in the world, in the City of Xalapa, Veracruz, the actions to take care of everyone included the closure of companies in the gastronomic sector, leaving the service only to take away. This great challenge is also an opportunity for the sector, which grows daily in both suppliers and demanders. Each restaurant must analyze its financial projects and its business plan to give the best service to the diner and stay in time. Use this reflection document to analyze the importance of finances in companies in the gastronomic sector and the work of its commercial manager.Ante la contingencia sanitaria por el brote de COVID-19 en el mundo, en la Ciudad de Xalapa, Veracruz, las acciones para cuidar a todos incluyeron el cierre de empresas del sector gastronómico dejando el servicio sólo para llevar. Este gran reto es también una oportunidad para el sector, que a diario crece en ofertantes y demandantes. Cada restaurante, deberá analizar sus proyectos financieros y su plan de negocios con la finalidad de dar el mejor servicio al comensal y mantenerse en el tiempo. Sirva este documento de reflexión para analizar sobre la importancia de las finanzas en las empresas del sector gastronómico y el quehacer de su gerente comercial

Understanding the disorder of the DNA base cytosine on the Au(111) surface

Using ultrahigh vacuum scanning tunneling microscopy (STM) and ab initio density functional theory, we have investigated in detail structures formed by cytosine on the Au(111) surface in clean ultrahigh vacuum conditions. In spite of the fact that the ground state of this DNA base on the surface is shown to be an ordered arrangement of cytosine one-dimensional branches (filaments), this structure has never been observed in our STM experiments. Instead, disordered structures are observed, which can be explained by only a few elementary structural motifs: filaments, five- and sixfold rings, which randomly interconnect with each other forming bent chains, T junctions, and nanocages. The latter may have trapped smaller structures inside. The formation of such an unusual assembly is explained by simple kinetic arguments as a liquid-glass transition. © 2008 American Institute of Physics

An STM study of molecular exchange processes in organic thin film growth

The growth of a fullerene derivative (PCBM) on top of a layer of a tetrathiafulvalene (TTF) derivative previously deposited on Au(111) has been studied by scanning tunneling microscopy (STM). The results show that the preferential interaction with the gold substrate induces the exchange of PCBM molecules with the exTTF monolayer, expelling exTTF molecules to the outer surface. This exchange process is forbidden when the thickness of the exTTF layer increases above the monolayer, and the larger surface energy of PCBM leads to the growth of 3D islandsOur work was supported by the MICINN of Spain (FIS2010-18847, FIS2012-33011), Comunidad de Madrid (NanobiomagnetS2009/MAT-1726), CONSOLIDER-INGENIO on Molecular Nanoscience (CSD2007-00010) and European Union (SMALL PITN-GA- 2009-23884

Obligación de aportar al sistema privado de pensiones y la contratación de personal en el estudio contable CELOAL GROUP CONTADORES S.A.C. en el año 2020

El presente trabajo de suficiencia profesional pretende encontrar la solución al problema que en la actualidad vienen experimentando por esta zona las micro empresas, relacionado a la obligación que tienen para aportar al sistema pensionario, este estudio solo ha tomado al sistema privado de pensiones (SPP) para el análisis, por lo anterior se planteó el objetivo general de explicar la relación que existe entre la obligación de aportar al sistema privado de pensiones y la contratación de personal en el estudio contable CELOAL GROUP CONTADORES SAC, de la ciudad de Rioja, para lo cual empleamos las técnicas de recolección de datos de la encuesta y la entrevista, analizamos la problemática de las micro empresas con relación a la obligación de aportar al sistema privado de pensiones y las limitaciones que tienen para ello, concluyendo que dicha obligación influye en la contratación de su personal, es decir una micro empresa que quiere formalizar la contratación de su personal se encuentra con el problema que no lo puede hacer por la misma negativa del trabajador que manifiesta su descontento al ser informado que será descontado de su remuneración el importe correspondiente para aportarlo al sistema pensionario elegido, para solucionar esta problemática planteamos que se modifique la norma legal que obliga a los empleadores a afiliar y cotizar a algún sistema pensionario por sus trabajadores contratados, por una norma flexible y voluntaria

Stator inter-turn faults diagnosis in induction motors using zero-sequence signal injection

This study presents a strategy for stator inter-turn faults diagnosis in induction motors (IMs) operating under timevariable load and time-variable speed conditions. The strategy consists in injecting a zero-sequence high-frequency signal in order to analyse variations in the stator inductances. Incipient stator inter-turn faults are detected by a simple signal processing of the derivatives of the currents. A feature of the strategy is that the zero-sequence high-frequency signal is generated by the inverter that feeds the machine, without modifying the standard space vector modulation of the IM-drive. Experimental results show that faults representing <1% of the stator winding can be detected, as well as the phase location of the fault, validating this proposal.Fil: Otero, Marcial. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Instituto de Investigaciones en Tecnologías Energéticas y Materiales Avanzados. - Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Tecnologías Energéticas y Materiales Avanzados; ArgentinaFil: de la Barrera, Pablo Martin. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Instituto de Investigaciones en Tecnologías Energéticas y Materiales Avanzados. - Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Tecnologías Energéticas y Materiales Avanzados; ArgentinaFil: Bossio, Guillermo Rubén. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Instituto de Investigaciones en Tecnologías Energéticas y Materiales Avanzados. - Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Tecnologías Energéticas y Materiales Avanzados; ArgentinaFil: Leidhold, Roberto. Otto-von-Guericke-Universität Magdeburg; Alemani

Morphology and Material Composition of the Mouthparts of Stromatium unicolor Olivier 1795 (Coleoptera: Cerambycidae) for Bionic Application

The novelty of this study is the deep analysis of the morphologic, geometric and mechanical performance of longhorn beetle larvae mouthparts. Furthermore, a metal nano identification of jaw reinforced parts was made. Background and Objectives: Analysis of insect mechanical properties has shown an important application in the develop of bionic technologies such as new materials, industrial machines and structural concepts. This study aims to determine the mechanical and geometric properties of longhorn beetle (Stromatium unicolor Olivier 1795) larvae mouthparts to improve the development of innovative cutting tools. In addition, this study obtains a nano identification of metals in the cuticle of the mouthparts, which will enable the development of new nontoxic and sustainable preservation agents against xylophagous insects based on nanoparticles. Materials and Methods: five third-larval-stage samples of Stromatium unicolor were used to study its mandible morphologic, geometric and mechanical properties. To this end, mouthparts were analyzed by several microscopic techniques using a scanning electron microscope, a stereomicroscope and an optical microscope. Composition analysis was performed using with two Analytical-Inca X-ray detectors, dispersive energy spectroscopy and dispersive wavelength spectroscopy. Results: The main geometric parameters of the insect jaw are the edge angle (β = 77.3°), maximum path depth of the insect (120 μm), length (800 µm) and mouthpart movement, which were identified and measured. The chemical analysis results of the jaw tissues shows the presence of zinc and manganese. Conclusions: The geometry and angles of the mouthparts can be applied in the fabrication of bionic self-sharpening cutting tools. Molecular compounds that form the reinforcing elements in the jaws can be used to develop wood preservatives based on nanometals and metal absorption and metabolism inhibitor