Satellite Altimetry and Current-Meter Velocities in the Malvinas Current at 41°S: Comparisons and Modes of Variations

Three year long current-meter arrays were deployed in the Malvinas Current at 418S below a satellite altimeter track at about 10 years intervals. Surface geostrophic velocities (SGV) derived from satel- lite altimetric data are compared with the in situ velocities at the upper current meter (􏰁300 m). Multisatel- lite gridded SGV compare better with in situ observations than along-track SGV. In spite of the proximity of the moorings to the complex Brazil-Malvinas Confluence (BMC) region, satellite SGV are significantly corre- lated with the 20 day low-passed in situ velocities (0.85 for along-isobaths velocities, 0.8 for cross-isobaths velocities). The recent in situ measurement period (2014?2015) stands out in the altimetry record with a long-lasting (4 months) high level of eddy kinetic energy at the mooring site and a southernmost location of the Subantarctic Front (SAF). The first two modes of variations of sea level anomaly (SLA) over the BMC remarkably match the first two modes of the low-passed in situ velocities. The first mode is associated with a latitudinal migration of the SAF, and the second with a longitudinal displacement of the Brazil Current overshoot. The two modes dominate the 24 year long record of SLA in the BMC, with energy peaks at the annual and semiannual periods for the first mode and at 3?5 months for the second mode. The SLA over the Southwest Atlantic was regressed onto the two confluence modes of SLA variations and showed remarkable standing wave train like structures in the Argentine Basin.Fil: Ferrari, Ramiro. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Centro de Investigaciones del Mar y la Atmósfera. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Centro de Investigaciones del Mar y la Atmósfera; ArgentinaFil: Artana, Camila Indira. Universite de Paris VI; FranciaFil: Saraceno, Martin. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Centro de Investigaciones del Mar y la Atmósfera. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Centro de Investigaciones del Mar y la Atmósfera; ArgentinaFil: Piola, Alberto Ricardo. Ministerio de Defensa. Armada Argentina. Servicio de Hidrografía Naval; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Provost, Christine. Universite de Paris VI; Franci

Biogas production by anaerobic codigestion using kiwi waste and wine sludge

Considering a large generation of wastes, the anaerobic codigestion (AcoD) is an alternative to transform two or more types of organic waste in energy and biofertilizer. To test the biogas production potential using kiwi waste and wine sludge, two AD assays with each substrate isolated and AcoD with four different substrate proportion was realized, using as inoculum sludge from a septic tank. The experimental was realized during 19 days in batch reactor (250 mL). Among digestion results, kiwi waste had de best result, being 27.0 mLN gVS-1 of biogas. The most satisfactory value in AcoD was 40.5 mLN g VS-1 of biogas, from treatment with 0.5 g kiwi and 3.3 g wine sludge. The AcoD test produced 16 mLN gVS-1 of biogas more than ADinfo:eu-repo/semantics/publishedVersio

Effect of ultrasound in crude glicerol as pretreatment for methane production

As global energy supply is based on petroleum derivate, scarcity of natural sources and environmental concerns are problems associated to the energy supply as well as the increasing demand. Renewable energy sources can replace this conventional energy source and decrease the environmental emissions.. In this work is going to be evaluated the effect of ultrasound pretreatment on crude glycerol from biodiesel production process to improve the methane production from biogas in an anaerobic digestion process. Different times of pretreatment are going to be examined 10, 15 and 30 minutes to determinate the best performance and compare it to the untreated substrate. The results showed that ultrasound pretreatment improved methane production by using 30 minutes of treatment on crude glycerol.info:eu-repo/semantics/publishedVersio

Positron annihilation study of defect distribution in 8YSZ nanostructure

The impact of the interfacial contribution on overall properties increases with decreasing grain size of polycrystalline materials. It is well known that distribution and size of cluster defects are rather different in bulk than grain boundaries. In light of "bottom-up" approaches, a study at the atomic level determining the distribution of crystallographic defects could clarify their contribution to the macroscopic properties, and then differentiate materials for outstanding or precise applications. In this work, Positron Annihilation Spectroscopy (PAS) is used to characterize the distribution of defects within 8 mol% Y₂O₃-stabilized zirconia (8YSZ) structures prepared by sintering through three different thermal treatments, i.e. a conventional thermal cycle in air and N₂/H₂ atmosphere, and a fast firing cycle in air, which lead to average grain sizes < 260 nm.The authors would like to acknowledge the financial support from the Spanish Government through the projects MAT2009-14448-C02-01 and IPT-310000-2010-12.Publicad

Modeling of mass transfer during osmotic dehydration process of pears in solutions of sucrose and sorbitol

Este trabajo tuvo como objetivo estudiar la transferencia de masa y cinética de deshidratación osmótica de trozos de pera en soluciones de sacarosa y/o sorbitol. Medias rodajas de peras variedad Packham´s, de 10 mm de espesor fueron inmersas en soluciones hipertónicas de sacarosa o sorbitol en concentraciones de 40 y 60ºBrix. Soluciones conteniendo los dos azucares también fueron utilizadas con la intención de validar el efecto de los solutos en los parámetros de proceso. Las concentraciones fueron las siguientes: 40% de sacarosa + 20% de sorbitol, 30% sacarosa + 30% sorbitol y 20% sacarosa + 40% sorbitol. El proceso fue conducido por 24 h con temperatura controlada (30ºC) y agitación de 90 ciclos/min. La pérdida de agua y de peso y la incorporación de sólidos en la fruta fueron analizadas a lo largo del proceso en función del tipo y concentración de la solución. Para todos los ensayos, la pérdida de agua y peso aumentaron significativamente con la elevación de la concentración de la solución deshidratante, en tanto que los ensayos con sorbitol promovieron una mayor tasa de salida de agua de la fruta y mayor ganancia de sólidos, debido al menor peso molecular del sorbitol en relación a la sacarosa. En los tratamientos realizados con los dos solutos, la proporción sacarosa:sorbitol en la solución influenció directamente en los resultados, verificándose un mayor efecto del sorbitol tanto en la pérdida de agua como en la incorporación de azucares. Se utilizó la solución analítica para difusión con propiedades constantes para obtener los coeficientes efectivos de difusión del agua y los solutos en las distintas condiciones de proceso.The objective of this work was to study mass transfer and osmotic dehydration kinetics of pear pieces in solutions of sucrose or sorbitol. Half slices of pears of the variety Packham´s Triumph were immersed in hypertonic aqueous solutions of sucrose or sorbitol with concentrations of 40 or 60ºBrix. Solutions containing both sugars were also used in the attempt to validate the effect of solutes on process parameters. Compositions used were: 40% sucrose + 20% sorbitol, 30% sucrose + 30% sorbitol and 20% sucrose + 40% sorbitol. The process was run during 24 h at constant temperature (30ºC) and agitation (90 cycles/min). Weight and water loss and solids gain were analyzed along process time as a function of solution composition and concentration. For all runs weight and water loss increased significantly with solution concentration. Sorbitol induced a higher water loss and solid gain due to its lower molecular weight respect to sucrose. In the tests using mixtures of solutes the ratio sorbitol:sucrose influenced directly on results: the higher ratios determined and increase in water loss and solids gain. The analytical solution for a system with diffusion in a liquid medium, with constant properties was used to obtain the effective diffusion coefficients of water and solutes for the different process conditions.Centro de Investigación y Desarrollo en Criotecnología de AlimentosFacultad de Ingenierí

Effect of highly dispersed yttria addition on thermal stability of hydroxyapatite

The capability of the colloidal method to produce yttria (Y₂O₃) dispersed hydroxyapatite (HA) has been investigated as an alternative method to the conventional method of mechanical mixing and sintering for developing HA-based materials that could exhibit controllable and enhanced functional properties. A water based colloidal route to produce HA materials with highly dispersed Y₂O₃ has been applied, and the effect of 10 wt.% Y₂O₃ addition to HA investigated by thermal analysis, X-ray diffraction and Fourier transform infrared spectroscopy. These measurements evidence a remarkable effect of this Y₂O₃ addition on decomposition mechanisms of synthetic HA. Results show that incorporation of Y₂O₃ as dispersed second phase is beneficial because it hinders the decomposition mechanisms of HA into calcium phosphates. This retardation will allow the control of the sintering conditions for developing HA implants with improved properties. Besides, substitution of Ca⁻2+ with Y⁻3+ ions appears to promote the formation of OH- vacancies, which could improve the conductive properties of HA favorable to osseointegration.This work has been supported by the Ministry of Science and Innova tion of Spain (MICINN) under contracts MAT2009 14448 C02 01 and IPT 310000 2010 12, and Regional Government of Madrid through the ESTRUMAT CM program (MAT 1585).Publicad

Educación Sexual Integral: recorridos, apropiaciones y resistencias

¿Qué miradas tienen las y los adolescentes de colegios públicos y privados de Córdoba sobre la educación sexual que reciben? ¿Cuáles son sus demandas e intereses? ¿Cómo entienden lo integral? ¿De qué manera evalúan los enfoques y metodologías desde las que se trabaja la ESI en las escuelas? Estos interrogantes se planteó un grupo de docentes, investigadoras e investigadores de la Facultad de Filosofía y Humanidades de la UNC, que nos llevaron a conocer qué piensan y sienten las y los jóvenes con relación a sus experiencias de educación sexual integral.Fil: Tomasini, Marina Edith. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Humanidades. Universidad Nacional de Córdoba. Instituto de Humanidades; Argentina. Universidad Nacional de Córdoba. Facultad de Filosofía y Humanidades. Centro de Investigaciones María Saleme Burnichón; ArgentinaFil: Morales, María Gabriela. Universidad Nacional de Córdoba. Facultad de Filosofía y Humanidades. Centro de Investigaciones María Saleme Burnichón; ArgentinaFil: Gontero, Natalia. Universidad Nacional de Córdoba. Facultad de Filosofía y Humanidades. Centro de Investigaciones María Saleme Burnichón; ArgentinaFil: Esteve, María. Universidad Nacional de Córdoba. Facultad de Filosofía y Humanidades. Centro de Investigaciones María Saleme Burnichón; ArgentinaFil: Ferrucci, Verónica. Universidad Nacional de Córdoba. Facultad de Filosofía y Humanidades. Centro de Investigaciones María Saleme Burnichón; ArgentinaFil: Molina, Candela. Universidad Nacional de Córdoba. Facultad de Filosofía y Humanidades. Centro de Investigaciones María Saleme Burnichón; ArgentinaFil: Kaplan, Martina. Universidad Nacional de Córdoba. Facultad de Filosofía y Humanidades. Centro de Investigaciones María Saleme Burnichón; ArgentinaFil: Mondello, Ramiro. Universidad Nacional de Córdoba. Facultad de Filosofía y Humanidades. Centro de Investigaciones María Saleme Burnichón; ArgentinaFil: Nimo, Paola. Universidad Nacional de Córdoba. Facultad de Filosofía y Humanidades. Centro de Investigaciones María Saleme Burnichón; ArgentinaFil: Omar, Keila Danae. Universidad Nacional de Córdoba. Facultad de Filosofía y Humanidades. Centro de Investigaciones María Saleme Burnichón; ArgentinaFil: Guiñazú, Anahí. Universidad Nacional de Córdoba. Facultad de Filosofía y Humanidades. Centro de Investigaciones María Saleme Burnichón; ArgentinaFil: Páez, Laura. Universidad Nacional de Córdoba. Facultad de Filosofía y Humanidades. Centro de Investigaciones María Saleme Burnichón; ArgentinaFil: Ferrari, Lucía. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Córdoba. Facultad de Filosofía y Humanidades. Centro de Investigaciones María Saleme Burnichón; Argentin

Altimetry for the future: Building on 25 years of progress

In 2018 we celebrated 25 years of development of radar altimetry, and the progress achieved by this methodology in the fields of global and coastal oceanography, hydrology, geodesy and cryospheric sciences. Many symbolic major events have celebrated these developments, e.g., in Venice, Italy, the 15th (2006) and 20th (2012) years of progress and more recently, in 2018, in Ponta Delgada, Portugal, 25 Years of Progress in Radar Altimetry. On this latter occasion it was decided to collect contributions of scientists, engineers and managers involved in the worldwide altimetry community to depict the state of altimetry and propose recommendations for the altimetry of the future. This paper summarizes contributions and recommendations that were collected and provides guidance for future mission design, research activities, and sustainable operational radar altimetry data exploitation. Recommendations provided are fundamental for optimizing further scientific and operational advances of oceanographic observations by altimetry, including requirements for spatial and temporal resolution of altimetric measurements, their accuracy and continuity. There are also new challenges and new openings mentioned in the paper that are particularly crucial for observations at higher latitudes, for coastal oceanography, for cryospheric studies and for hydrology. The paper starts with a general introduction followed by a section on Earth System Science including Ocean Dynamics, Sea Level, the Coastal Ocean, Hydrology, the Cryosphere and Polar Oceans and the ‘‘Green” Ocean, extending the frontier from biogeochemistry to marine ecology. Applications are described in a subsequent section, which covers Operational Oceanography, Weather, Hurricane Wave and Wind Forecasting, Climate projection. Instruments’ development and satellite missions’ evolutions are described in a fourth section. A fifth section covers the key observations that altimeters provide and their potential complements, from other Earth observation measurements to in situ data. Section 6 identifies the data and methods and provides some accuracy and resolution requirements for the wet tropospheric correction, the orbit and other geodetic requirements, the Mean Sea Surface, Geoid and Mean Dynamic Topography, Calibration and Validation, data accuracy, data access and handling (including the DUACS system). Section 7 brings a transversal view on scales, integration, artificial intelligence, and capacity building (education and training). Section 8 reviews the programmatic issues followed by a conclusion

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