A star-product approach to noncompact quantum groups

Using duality and topological theory of well behaved Hopf algebras (as defined in [2]) we construct star-product models of non compact quantum groups from Drinfeld and Reshetikhin standard deformations of enveloping Hopf algebras of simple Lie algebras. Our star-products act not only on coefficient functions of finite-dimensional representations, but actually on all $C^\infty$ functions, and they exist even for non linear (semi-simple) Lie groups.Comment: 13 page

Synthetic and natural iron oxide characterization through microparticle voltammetry

Se presentan los resultados de un estudio sobre el uso de la Voltametría de Micropartículas (VMP), aplicada a la identificación de óxidos y oxihidróxidos de hierro. Mediante esta técnica, fue posible diferenciar hematita, goethita, magnetita y maghemita, en muestras sintéticas y naturales. La medición de pigmentos sintéticos tratados a diferentes temperaturas, evidenció la existencia de un patrón de comportamiento que permite diferenciarlos. Se constató que la ubicación del pico de corriente (valor de potencial), varía en función de la especie mineral, el tamaño de grano y el grado de cristalinidad, el área, en relación con la concentración de especie electroactiva y el ancho, con la distribución de tamaños de partícula. En muestras con elevadas concentraciones de óxidos y oxihidróxidos de hierro, los picos se definieron a corrientes del orden de los mA (miliamperes) y en muestras de paleosuelos con un contenido de hierro total inferior al 6%, los picos se registraron a corrientes del orden de los µA (microamperes). De esta manera, se constata la posibilidad de aplicación de la técnica en estudios ambientales y paleoambientales que tengan en cuenta a estos minerales. Las principales ventajas de la VMP, respecto a los métodos convencionales, se refieren a la rapidez y simplicidad de aplicación y a la posibilidad de procesar pocos microgramos de muestra, sin limitación de su grado de cristalinidad. A diferencia de los métodos magnéticos, fuertemente condicionados por la presencia de magnetita, la VMP resulta altamente sensible a la detección de especies débilmente magnéticas.We are hereby presenting the results obtained from a study on using Microparticle Voltammetry (MPV) for identifying Iron oxides and oxy–hydroxides. This technique allowed us to distinguish different mineral species, such as hematite, goethite, magnetite and maghemite, in both synthetic and natural samples. By measuring synthetic pigments at different temperatures, evidence was found of an electrochemical behavioral pattern which allowed differenciating them. The current peak location (potential value) proved to vary according to the mineral species, grain size and chrystallinity degree. The area varies in terms of electroactive concentration of the species given. Width varies according to particle size distribution. In high iron oxide and oxy–hydroxide concentration samples, peaks were defined at current values of mA (milliampers) and in paleosol samples having an overall iron content lower than 6%, peaks were recorded at currents of µA (microampers). Therefore, a possibility arises of applying this technique to environmental and palaeo–environmental studies of these minerals. MPVs main advantages compared to conventional methods are speed and simplicity as well as the fact that it allows processing a few sample grains, in spite of its chrystallinity degree. Unlike magnetic methods – strongly influenced by the presence of magnetite– MPV is highly sensitive for detecting weakly magnetic species.Fil: Rico, Yamile. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Laboratorio de Entrenamiento Multidisciplinario para la Investigación Tecnológica; ArgentinaFil: Bidegain, Juan Carlos. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Laboratorio de Entrenamiento Multidisciplinario para la Investigación Tecnológica; ArgentinaFil: Elsner, Cecilia Ines. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Centro de Investigaciones en Tecnología de Pinturas. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones en Tecnología de Pinturas; Argentin

Magnetostratigraphy in Aldea Brasilera, entre Rios, Argentina

Upper Cenozoic marine, fluvio-lacustrine and continental-eolian deposits are exposed in river banks and quarries within the province of Entre Rios in northern Argentina. A 26 m sequence from a quarry at Aldea Brasilera has been investigated as to sedimentological and environmental changes, and subjected to paleomagnetic analysis. The magnetostratigraphy established includes six polarity reversals and is interpreted to cover tha last about 3.3 Ma. The deposition of marine and fluvio-lacustrine deposits from 3.3 to about 1.5 Ma seems to have been fairly continuous, whilst the land surfaces and eolian (loess) deposition reflect sporadic deposition. The magnetostratigraphy established may serve as a regional standard section. A final marine transgression of Late Pliocene age is established right on top of the Kaena Reversed Polarity Event The close association between this geomagnetic event and final marine event may serve as a very useful chronostratigraphic marker level and horizon. It has been recorded in other sections under studies, too

Construção de uma barragem subterrânea como ação de combate a seca em operações do Projeto Rondon

Trabalho apresentado no II Congresso Nacional do PROJETO RONDON, realizado em Florianópolis, SC, no período de 23 a 25 de setembro de 2015 - Universidade Federal de Santa Catarina.O Projeto Rondon proporciona oportunidades de desenvolver ações de baixíssimo custo e grande abrangência aos que dele participam. Boas partes dos municípios aonde se realizam as operações sofrem com baixos índices pluviométricos, sendo que alguns deles já possuem açudes construídos por programas de governo, solução esta, que em longo prazo, prova ser ineficiente. A construção de uma Barragem Subterrânea se mostra uma alternativa eficiente, barata e moderna para este tipo de problema, como mostra a experiência vivida pelos rondonistas do Unilasalle-RJ na cidade de Apuiarés-CE durante a Operação Mandacarú realizada em janeiro de 2015. O objetivo deste trabalho é traduzir este conhecimento adquirido desde o planejamento, definição do local, recursos necessários, a melhor forma de fazer e as lições aprendidas, para que possa ser utilizada por outras equipes nas próximas operações capacitando pequenos agricultores e técnicos da prefeitura a utilizar esta tecnologia, melhorando as condições de vida destas pessoas

Jurisdicción y competencia municipal para el contralor de la seguridad e higiene en el ámbito portuario

Nos proponemos en el presente trabajo ahondar respecto al ámbito de ejecución de las competencias propias de los municipios bonaerenses y la correspondiente contraprestación tributaria que las mismas pudieran generar. A tales efectos hemos decidido realizar este estudio sobre una situación particular, que entendemos lleva al máximo el análisis del mismo. Consiste sintéticamente en abarcarlo a partir de ciertas actividades llevadas a cabo en establecimientos comerciales enclavados dentro del ámbito del Puerto Quequén.Fil: Bidegain, Juan Francisco. Universidad Nacional de Mar del Plata. Facultad de Ciencias Económicas y Sociales; Argentina

Social preferences for ecosystem services in a biodiversity hotspot in South America

Identifying which ecosystem services are relevant to different stakeholders and understanding stakeholders’ perceptions of such services is useful for making informed decisions, especially in regions of the world where the achievement of biodiversity conservation goals is threatened by economically productive activities. In this article, we assess social preferences for ecosystem services in a biodiversity hotspot in central Chile. We use a consultative case study to ask local stakeholders (n = 70) from the Campana Peñuelas Biosphere Reserve to identify the most important ecosystem services the area provides for them and inquire about the perceived vulnerability of the services to changes in the future. We also explore the association between the perceived importance of ecosystem services and the sociodemographic and cultural characteristics of the respondents, which allows us to identify contrasting stakeholder perceptions of different ecosystem services. The most important services for local actors were the drinking water, fresh air and climate change control, genetic pool of plant communities in central Chile, and educational value. From the perspective of local actors, the services that could be threatened by negative changes in the future in terms of their provision included the possibilities of developing conservation activities focused on iconic threatened animal and plant species, water regulation, food from agriculture, and drinking water. Contrasting perceptions about the importance of ecosystem services emerged among stakeholders. While small farmers and members of local organizations attributed higher importance values to provisioning services, scientists and rangers and administrators of protected areas as well as teachers, NGO members and local government employees attributed more importance to the regulating and cultural services associated with threatened species. Our results can serve as a source of information for the planning and decision-making processes related to the search for socially and ecologically sustainable solutions for land use managemen

Adsorción de contaminantes en sedimentos del Holoceno de la región de La Plata

Técnicas geológicas, geoquímicas y geofísicas fueron aplicadas a los fines de determinar la presencia y concentración de metales pesados en sedimentos de los cursos de agua de la región de La Plata. Estos arroyos, que atraviesan el casco urbano, han sido entubados en su gran mayoría, empero en los sectores bajos y en la planicie costera corren a cielo abierto por canales.Con el crecimiento urbanístico y poblacional, los cursos de agua son también receptores de desechos urbanos, industriales y agropecuarios. Interpretamos que las arcillas de los sedimentos de la región retienen con mayor facilidad (adsorción) los contaminantes, que si estos materiales fueran de granulometría gruesa. A partir de este supuesto se realizó la investigación procurando establecer la relación existente entre los distintos parámetros utilizados, los metales pesados, la variación del contenido en materia orgánica y la concentración de óxidos de hierro. Esto último debido particularmente a que óxidos y oxyhidróxidos de hierro, en asociación con arcillas esmectitas, coadyuvan en el proceso de adsorción de contaminantes. El área de estudio se ubica en 34º 50´ y 35º 2´ Lat. S, 57º 45´ y 58º 5´ Long. W.Geological, geochemical and geophysical techniques were applied for the purposes of determining the presence and concentration of heavy metals in streams sediments of La Plata region. These streams, passing through the town, have been tuned in its vast majority, but in low areas as on the coastal plain they run in open channels.With the population and urban growth, water courses are also recipients of urban, industrial and agricultural wastes. We interpret that clay minerals of the sediments of the streams retain more easily (adsorption) pollutants than sediments of coarse grain size. From this assumption a research trying to establish the relationship between the parameters used, heavy metals and variation of the organic matter was performed. The concentration of total iron oxides was also taken into account considering that iron oxides and oxyhydroxides assist in the process of adsorption of contaminants in association with smectite clays. The area of study is located between 34º 50´- 35º 2´ Lat. S and 57º 45´- 58º 5´ Long. W

La museificación del cuerpo en la gimnasia

Fil: Rocha Bidegain, A. Liliana. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación. Instituto de Investigaciones en Humanidades y Ciencias Sociales (UNLP-CONICET); Argentina.Fil: Lescano, Agustín. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación. Instituto de Investigaciones en Humanidades y Ciencias Sociales (UNLP-CONICET); Argentina

Modelling the Effect of the Interaction between Vaccination and Nonpharmaceutical Measures on COVID-19 Incidence

Since December 2019, the novel severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has spread rapidly from Wuhan (China) across the globe, affecting more than 200 countries by mid-2021, with over 190M reported cases and around 4M fatalities. During the first year of the pandemic, affected countries implemented a variety of nonpharmaceutical interventions to control virus transmission. In December 2020, countries started administering several authorised vaccines under a limited supply scenario. In this context, the aim of this study was to develop a SEIR-type continuous-time deterministic disease model, to determine the impact of interaction between different vaccination scenarios and levels of protection measures on disease incidence. For this, the model incorporates (i) a protection measure including low (self-protection), medium (mobility limitation), high (closure of indoor facilities), and very high (lockdown) protection levels, (ii) quarantine for confirmed cases, and (iii) vaccination rate and efficacy of four types of vaccines (Pfizer, Moderna, Astra Zeneca, and Janssen). The model was verified and evaluated using the response timeline and vaccination strategies and rates in the Basque Country (N. Spain). Once the model performance was validated, different initial phase (when 30% of the population is vaccinated) vaccination scenarios were simulated, including (i) a realistic vaccine limited supply scenario and (ii) four potential full vaccine supply scenarios where a unique vaccine type is administered. Significant differences in disease prevalence and cumulative mortality were found between vaccination scenarios for low and medium-level protection measures. For high-level protection measures, any vaccine scenario is effective at limiting the virus transmission and disease mortality. The results obtained here may vary in further studies since there may be some unpredictable factors/covariates. With this in mind, the model here could be easily applied to other regions or countries, modifying the strategies implemented and initial conditions

Magnetostratigraphy in the Vela and Barker Formations, Tandil, Buenos Aires Province, Argentina

La presente contribución se refiere a una sucesión sedimentaria del Cenozoico tardío expuesta en la localidad de María Ignacia, Argentina. Las muestras paleomagnéticas se obtuvieron de una sección asignada principalmente a las Formaciones Vela y Barker. El análisis de los datos paleomagnéticos indica que la Formación Vela es de polaridad normal, y se atribuye, con seguridad, al Cron Brunhes (< 0,781Ma). La porción expuesta de la Formación Barker es, en cambio, de polaridad inversa y puede ser asignada al Cron Gilbert (3,596 – 6,033 Ma). Los estudios magnetoestratigráficos constituyen una vía apropiada para conocer la edad de la Formación Barker ya que se carece de dataciones radiométricas y de registros bioestratigráficos hasta el presente. Los parámetros de magnetismo de rocas indican diferencias entre las unidades estudiadas. Se estudiarán exhaustivamente en futuras contribuciones con el fin de poder realizar interpretaciones de las condiciones paleo-ambientales en el lapso de tiempo considerado.The present contribution refers to paleomagnetic studies carried out in a late Cenozoic sedimentary sequence exposed in the locality of María Ignacia, Argentina. Paleomagnetic samples were collected from a section assigned mainly to the Vela Formation (the youngest) and the Barker Formation (the oldest). The analysis of Paleomagnetic data indicates that the Vela Formation presents samples of normal polarity while the Barker Formation presents samples of reverse polarity. A preliminary interpretation allows us to assign the samples of normal polarity to the Brunhes Normal Polarity Chron (< 0.781 Ma) while the reverse polarity samples might be assigned to the Gilbert Reverse Polarity Chron (3.596 – 6.033 Ma). Magnetostratigraphic studies provide a suitable way for estimate the age of the Barker Formation, since there are a lack of radiometric datable materials and fossils remains up to now. The rock magnetic parameters indicate difference between geological units; such behavior will be studied carefully in future contributions for estimating the paleoenvironmental conditions during the considered time span.Fil: Gómez Samus, Mauro Leandro. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Bidegain, Juan Carlos. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas; Argentin