La arquitectura del hoyo. Una lectura empírica del hoyo

El texto busca entender el concepto del “hoyo” dentro de la teoría arquitectónica, rescatando a esta categoría del papel que juega dentro del discurso filosófico para regresarlo a la materialidad dentro de la teoría arquitectónica. La filosofía a tratado el estatus del hoyo como un problema teórico y siempre lo a confinado en términos de su negatividad y negación, dentro de los problemas de la nada. En este texto los argumento filosóficos concernientes con la “nada” son considerados solamente con la finalidad de ser transformados en conceptos positivos dentro de la teoría arquitectónica. Este ensayo se propone abrir el argumento para una discusión posterior. y presentar acercamientos hacia cuales podrían considerarse “hoyos” en el entorno físico. También analiza, brevemente, la cuestión empírica de los hoyos descritos por la arquitectura, mostrando que producen condiciones y efectos mucho más complejos de los que normalmente la arquitectura reconoce

A reappraisal of Notohypshilophodon comodorensis (Ornithischia: Ornithopoda) from the Late Cretaceous of Patagonia, Argentina

The Bajo Barreal Formation (Cenomanian, Late Cretaceous; central Patagonia, Argentina) preserves an important and rich fossil record. Among the dinosaurs described, a small ornithischian, Notohypsilophon comodorensis, was named in the 1990s. This small-bodied dinosaur, the most complete representative of the group discovered in that formation, was described as a ?hypsilophodontid? ornithopod based on close morphological affinities with other members of that group, which is currently regarded as paraphyletic. Within this context, we present a restudy of Notohypsilophodon. This dinosaur is considered a basal ornithopod, probably more basal than Gasparinisaura. Likewise, this analysis emends and provides additional unique anatomical characters that support its taxonomic validity and position. On the basis of weak evidence, Notohypsilophodon might share the presence of gastroliths with other basal ornithopods (Gasparinisaura and Haya), which could suggest a specific behavior in response to its food ingestion. Finally, this study increases our knowledge of the evolutionary dynamics of South American Cretaceous ornithopods, and therefore broadens our knowledge of the early Late Cretaceous continental vertebrate assemblages of central Patagonia and of the Southern Hemisphere in general.Fil: Ibiricu, Lucio Manuel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; ArgentinaFil: Martínez, Rubén D.. Universidad Nacional de la Patagonia. Sede Esquel; ArgentinaFil: Luna, Marcelo. Universidad Nacional de la Patagonia. Sede Esquel; ArgentinaFil: Casal, Gabriel A.. Universidad Nacional de la Patagonia. Sede Esquel; Argentin

Nuevos aportes a la palinología de las formaciones Frayle Muerto, Mangrullo y Paso Aguiar, Paleozoico Superior, Uruguay

Palynological content of nine samples extracted from borehole N° 254 “Paso de las Toscas”(DI.NA.MI.GE.) is analyzed. The samples derived from the Frayle Muerto, Mangrullo and Paso Aguiar formations, Permian in age. A total of 123 species were identified. This paper presents a systematic analysis of 25 species that are new records for Uruguay. Twelve of these species are assigned to spores, seven to pollen grains and six to acritarchs. Pollen grains are dominant in all assemblages except in the lower stratigraphic levels. Spores are present in relatively high proportions only at the lower and upper levels. Acritarchs and reworked material are found in two samples. The comparison of palynological assemblages with regional palynostratigraphic schemes suggests a Cisuralian age (probably Asselian-Artinskian) for the lower stratigraphic level (Cristatisporites Biozone for Argentina, Vittatina costabilis Biozone for Brasil and Cristatisporites inconstans–Vittatina saccata Biozone for Uruguay) and an age between the late Cisuralian and the Guadalupian for the remaining levels (Striatites Biozone for Argentina, Lueckisporites virkkiae Biozone for Brasil and Striatoabieites anaverrucosus – Staurosaccites cordubensis Biozone for Uruguay).Se analiza el contenido palinológico de nueve muestras pertenecientes a la perforación N° 254 “Paso de las Toscas” (DI.NA.MI.GE.) que abarcan las formaciones Frayle Muerto, Mangrullo y Paso Aguiar, de edad Pérmica. De un total de 123 especies identificadas, se analizan desde el punto de vista sistemático las 25 especies que son nuevas citas para Uruguay, de las cuales 12 corresponden a esporas, siete a granos de polen y seis a acritarcas. Los granos de polen predominan en todas las asociaciones salvo en los niveles estratigráficamente inferiores. Las esporas se presentan en proporciones relativamente elevadas únicamente en el nivel inferior y en los niveles superiores. Las acritarcas y el material retrabajado están presentes en dos muestras. La comparación de las asociaciones palinológicas con los esquemas palinoestratigráficos regionales sugiere una edad Cisuraliense, probablemente comprendida entre el Asseliense y el Artinskiense, para el nivel estratigráfico inferior (Biozona Cristatisporites para Argentina, Biozona Vittatina costabilis para Brasil y Biozona Cristatisporites inconstans–Vittatina saccata para Uruguay) y una edad entre el Cisuraliense Tardío y el Guadalupiense para los niveles restantes (Biozona Striatites para Argentina, Biozona Lueckisporites virkkiae para Brasil y Biozona Striatoabieites anaverrucosus – Staurosaccites cordubensis para Uruguay)

Development of a Kinect-based exergaming system for motor rehabilitation in neurological disorders

The development of videogames for physical therapy, known as exergames, has gained much interest in the last years. In this work, a system for rehabilitation and clinical evaluation of neurological patients is presented. The Microsoft Kinect device is used to track the full body of patients, and three games were developed to exercise and assess different aspects of balance and gait rehabilitation. The system provides visual feedback by means of an avatar that follows the movements of the patients, and sound and visual stimuli for giving orders during the experience. Also, the system includes a database and management tools for further analysis and monitoring of therapies. The results obtained show, on the one side, a great reception and interest of patients to use the system. On the other side, the specialists considered very useful the data collected and the quantitative analysis provided by the system, which was then adopted for the clinical routine.Fil: Estepa, A.. Universidad Nacional del Litoral. Facultad de Ingeniería y Ciencias Hídricas; ArgentinaFil: Spontón Píriz, Sergio Gustavo. Centro de Rehabilitación E Investigación:dr. L.maradona; ArgentinaFil: Albornoz, Enrique Marcelo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigación en Señales, Sistemas e Inteligencia Computacional. Universidad Nacional del Litoral. Facultad de Ingeniería y Ciencias Hídricas. Instituto de Investigación en Señales, Sistemas e Inteligencia Computacional; ArgentinaFil: Martínez, César Ernesto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigación en Señales, Sistemas e Inteligencia Computacional. Universidad Nacional del Litoral. Facultad de Ingeniería y Ciencias Hídricas. Instituto de Investigación en Señales, Sistemas e Inteligencia Computacional; Argentin

Global atmospheric dynamics investigated by using Hilbert Frequency Analysis

El artículo pertenece al número especial: Applications of Information Theory in the GeosciencesThe Hilbert transform is a well-known tool of time series analysis that has been widely used to investigate oscillatory signals that resemble a noisy periodic oscillation, because it allows instantaneous phase and frequency to be estimated, which in turn uncovers interesting properties of the underlying process that generates the signal. Here we use this tool to analyze atmospheric data: we consider daily-averaged Surface Air Temperature (SAT) time series recorded over a regular grid of locations covering the Earth’s surface. From each SAT time series, we calculate the instantaneous frequency time series by considering the Hilbert analytic signal. The properties of the obtained frequency data set are investigated by plotting the map of the average frequency and the map of the standard deviation of the frequency fluctuations. The average frequency map reveals well-defined large-scale structures: in the extra-tropics, the average frequency in general corresponds to the expected one-year period of solar forcing, while in the tropics, a different behaviour is found, with particular regions having a faster average frequency. In the standard deviation map, large-scale structures are also found, which tend to be located over regions of strong annual precipitation. Our results demonstrate that Hilbert analysis of SAT time-series uncovers meaningful information, and is therefore a promising tool for the study of other climatological variables

Boosting mobility performance with multi-path TCP

Proceeding of: Future Network & Mobile Summit 2010, 16 - 18 June 2010, Florence, ItalyFourth Generation mobile devices incorporate multiple interfaces with diverse access technologies. The current Mobile IP protocol fails to support the enhanced fault tolerance capabilities that are enabled by the availability of multiple interfaces. In particular, established Mobile IP communications cannot be preserved through outages affecting the Home Address. In this paper we describe an architecture for mobile host multihoming that enables transport layer survivability through multiple failure modes. The proposed approach relies on the cooperation between Mobile IP and Multi-Path TCP and aims to fully support multihoming and extend roaming capabilities of mobile devices.This research was supported by Trilogy (http://www.trilogy-project.org), a research project (ICT-216372) partially funded by the European Community under its Seventh Framework Programme.European Community's Seventh Framework ProgramNo publicad

Changes in height growth patterns in the upper tree-line forests of Tierra del Fuego in relation to climate change

Los bosques de Nothofagus pumilio ocupan las laderas de montaña hasta alcanzar el limite altitudinal del bosque. Estos ambientes extremos, donde los bosques están bajo condiciones de estrés ambiental, son óptimos para estudiar patrones de cambio debidos a variaciones climáticas. El objetivo fue analizar cambios recientes en el crecimiento en altura en bosques localizados en el tree-line altitudinal en Tierra del Fuego (Argentina) y establecer posibles vinculaciones con cambios en la temperatura observados durante las últimas décadas. Se muestrearon nueve sitios, y se midieron cuatro parcelas en cada sitio. Se determinó la estructura forestal y se realizaron análisis fustales para evaluar los patrones de crecimiento en altura. Se realizaron ANOVA y análisis de clasificación usando como factores principales al sitio y al tiempo. El crecimiento en altura aumentó a lo largo del tiempo, e.g. 1,0 cm año-1 durante 1870-1959, 2,7 cm año-1 durante 1960-1979 y 5,0 cm año-1 durante 1980-2010. Esas diferencias fueron significativas entre períodos de tiempo y sitios, pudiendo estar relacionadas con la localización geográfica. El incremento en el crecimiento en altura observado está relacionado con los cambios en la temperatura de superficie experimentada en todo el mundo. Una declinación en el crecimiento en altura durante las últimas dos décadas, también puede estar relacionada con una disminución regional de la temperatura de aire. El análisis del crecimiento en altura es una herramienta de utilidad para evaluar la incidencia que tiene el cambio climático sobre el crecimiento de los árboles que crecen en ambientes extremos.Nothofagus pumilio occupy the mountain slopes reaching to the upper altitudinal limit of the forests. This extremely stressful environment represents the optimum conditions to study changes in growth patterns due to climate variations. Our goal was to analyze recent changes in stem height growth in forests located in the upper altitudinal tree-line along Tierra del Fuego (Argentina), and establish possible linkages to changes observed in surface temperature during the last decades. Nine locations were sampled, and four plots were measured in each location. Forest structure was characterized, and stem analyses were performed to assess height growth patterns. ANOVAs and classification analyses were conducted using location and time as main variables. Tree-growth height increased with time, e.g. 1.0 cm.year-1 during 1870-1959, 2.7 cm year-1 during 1960-1979, and 5.0 cm year-1 during 1980-2010. These differences were significant between periods and locations, and can be related to its geographical situation. Increment in stem height growth seems to be related with the worldwide surface air temperature. A decline in stem height growth registered during the last two decades can also be related with the regional decrease in the mean air temperature. The analysis of stem height growth is a useful tool to evaluate the incidence of climate change over trees growing under extreme environmental conditions.Facultad de Ciencias Agrarias y ForestalesLaboratorio de Investigación de Sistemas Ecológicos y Ambientale

Changes in height growth patterns in the upper tree-line forests of Tierra del Fuego in relation to climate change

Los bosques de Nothofagus pumilio ocupan las laderas de montaña hasta alcanzar el limite altitudinal del bosque. Estos ambientes extremos, donde los bosques están bajo condiciones de estrés ambiental, son óptimos para estudiar patrones de cambio debidos a variaciones climáticas. El objetivo fue analizar cambios recientes en el crecimiento en altura en bosques localizados en el tree-line altitudinal en Tierra del Fuego (Argentina) y establecer posibles vinculaciones con cambios en la temperatura observados durante las últimas décadas. Se muestrearon nueve sitios, y se midieron cuatro parcelas en cada sitio. Se determinó la estructura forestal y se realizaron análisis fustales para evaluar los patrones de crecimiento en altura. Se realizaron ANOVA y análisis de clasificación usando como factores principales al sitio y al tiempo. El crecimiento en altura aumentó a lo largo del tiempo, e.g. 1,0 cm año-1 durante 1870-1959, 2,7 cm año-1 durante 1960-1979 y 5,0 cm año-1 durante 1980-2010. Esas diferencias fueron significativas entre períodos de tiempo y sitios, pudiendo estar relacionadas con la localización geográfica. El incremento en el crecimiento en altura observado está relacionado con los cambios en la temperatura de superficie experimentada en todo el mundo. Una declinación en el crecimiento en altura durante las últimas dos décadas, también puede estar relacionada con una disminución regional de la temperatura de aire. El análisis del crecimiento en altura es una herramienta de utilidad para evaluar la incidencia que tiene el cambio climático sobre el crecimiento de los árboles que crecen en ambientes extremos.Nothofagus pumilio occupy the mountain slopes reaching to the upper altitudinal limit of the forests. This extremely stressful environment represents the optimum conditions to study changes in growth patterns due to climate variations. Our goal was to analyze recent changes in stem height growth in forests located in the upper altitudinal tree-line along Tierra del Fuego (Argentina), and establish possible linkages to changes observed in surface temperature during the last decades. Nine locations were sampled, and four plots were measured in each location. Forest structure was characterized, and stem analyses were performed to assess height growth patterns. ANOVAs and classification analyses were conducted using location and time as main variables. Tree-growth height increased with time, e.g. 1.0 cm.year-1 during 1870-1959, 2.7 cm year-1 during 1960-1979, and 5.0 cm year-1 during 1980-2010. These differences were significant between periods and locations, and can be related to its geographical situation. Increment in stem height growth seems to be related with the worldwide surface air temperature. A decline in stem height growth registered during the last two decades can also be related with the regional decrease in the mean air temperature. The analysis of stem height growth is a useful tool to evaluate the incidence of climate change over trees growing under extreme environmental conditions.Facultad de Ciencias Agrarias y ForestalesLaboratorio de Investigación de Sistemas Ecológicos y Ambientale

Development of Cyanine 813@Imidazole-Based Doped Supported Devices for Divalent Metal Ions Detection

PM003/2016 IF/00007/2015 CEECIND/00648/2017A NIR cyanine@imidazole derivative Cy1 was synthesized and evaluated as a metal ion sensor in solution. Cy1 was shown to be very sensitive to all metal ions tested, presenting a blue shift in the absorption from 668 nm to 633 nm, followed by a change in colour from pale green to blue with Zn2+, Cd2+, Co2+, Ni2+ and Hg2+ ions. Despite the blue shift in the absorption, a decrease at 633 nm (with a colour change from pale green to colourless), as well as a quenching in the emission intensity at 785 nm were observed for Cu2+ ions. The results show the formation of sandwich complexes of two ligands per metal ion with the highest association constant observed for Cu2+ (Log Kass.abs = 14.76 ± 0.09; Log Kass.emis. = 14.79 ± 0.06). The minimal detectable amounts were found to be 31 nM and 37 nM, with a naked eye detection of 2.9 ppm and 2.1 ppm for Hg2+ and Cu2+ ions, respectively. These results prompted us to explore the applicability of Cy1 by its combination with nanomaterials. Thus, Cy1@ doped MNs and Cy1@ doped PMMA nanoparticles were synthesized. Both nanosystems were shown to be very sensitive to Cu2+ ions in water, allowing a naked-eye detection of at least 1 ppm for Cy1@ doped MNs and 7 ppm for Cy1@ doped PMMA. This colourimetric response is an easy and inexpensive way to assess the presence of metals in aqueous media with no need for further instrumentation.publishersversionpublishe