85 research outputs found
Análisis espacial del impacto de la tormenta de granizo en el Oasis Sur de Mendoza
No full textEste informe técnico presenta el análisis espacial de la
afectación sobre el área cultivada en el oasis sur de
Mendoza originado en la tormenta de granizo del 6 de enero
de 2025.EEA Rama CaídaFil: Picca, Cecilia Nelida. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rama Caída; ArgentinaFil: Brieva, Carlos Alberto. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rama Caída; ArgentinaFil: Pessano, Gabriel Horacio. Dirección de Agricultura y Contingencias Climáticas (San Rafael); ArgentinaFil: Pessano, Gabriel Horacio. Universidad Tecnológica Nacional (UTN). Facultad Regional San Rafael; ArgentinaFil: Silvestre, Mauro. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rama Caída. Agencia de Extensión Rural General Alvear; Argentin
The solution of the point kinetics equations via converged accelerated taylor series (CATS)
No full textThis paper deals with finding accurate solutions of the point kinetics equations including nonlinear feedback, in a fast, efficient and straightforward way. A truncated Taylor series is coupled to continuous analytical continuation to provide the recurrence relations to solve the ordinary differential equations of point kinetics. Non-linear (Wynn-epsilon) and linear (Romberg) convergence accelerations are employed to provide highly accurate results for the evaluation of Taylor series expansions and extrapolated values of neutron and precursor densities at desired edits. The proposed Converged Accelerated Taylor Series, or CATS, algorithm automatically performs successive mesh refinements until the desired accuracy is obtained, making use of the intermediate results for converged initial values at each interval. Numerical performance is evaluated using case studies available from the literature. Nearly perfect agreement is found with the literature results generally considered most accurate. Benchmark quality results are reported for several cases of interest including step, ramp, zigzag and sinusoidal prescribed insertions and insertions with adiabatic Doppler feedback. A larger than usual (9) number of digits is included to encourage honest benchmarking. The benchmark is then applied to the enhanced piecewise constant algorithm (EPCA) currently being developed by the second author
Benchmarks for the Point Kinetics Equations
No full textA new numerical algorithm for the solution of the Point Kinetics Equations, whose accurate solution has been sought for over 60 years. The method couples the simplest of finite difference methods, a backward Euler, with Richardsons extrapolation, also called acceleration. From this coupling, a series of benchmarks have emerged. These include cases from the literature as well as several new ones. The novelty of this presentation lies in the breadth of insertions considered, covering both prescribed and feedback reactivities, and the extreme eight to nine-digit accuracy achievable. The benchmarks presented are to provide guidance to those who wish to develop further improvements
Nevirapine induce cell differentiation in human anaplastic thyroid cancer in vivo: a case report
No full textXXXI National Meeting of the Italian Society of Endocrinolog
Radiative Transfer Modeling in the Cryosphere
No full textRadiative-Transfer (RT) modeling plays a key role in interpreting the radiance measured by multispectral sensors. At-sensor radiance depends upon glacier surface material composition and intermixture of materials, solar and sensor geometry, and surface topography. To bridge the gap between investigative findings and spectral data, a physically-based (i.e., based on first principles) linkage should be established between the properties of the observed surface and the measured electromagnetic signal. Complementing the treatment of related subjects in Chapter 2 (Bishop et al., this volume), in this chapter we show how RT theory can be adapted to derive Radiative-Transfer Equations (RTEs) that are commonly employed to properly describe the radiative field within, at the surface of, and above glaciers, debris fields, and glacier lakes. RTEs are derived using the basic principle of conservation of photons and are simplified to obtain equations that are mathematically tractable. Such equations are numerically solved to compute quantities that are of interest in remote sensing (e.g., Bidirectional Reflectance Factor (BRF) and spectral albedo) that are a function of the optical properties of the observed surface. Accurate modeling of the optical properties of single material particles (e.g., ice or snow, water, lithic debris, and carbon soot) is critical to obtain meaningful and accurate RT calculations. Common methods employed to determine single-scattering albedo and scattering-phase function, for both single-type particles and mixtures, are discussed. In addition, although the basic conservation of photons holds for both glaciers and glacier lake water, we have marked a clear distinction between the equations of transfer for glacier surfaces and glacier lake water, as well as between the methods employed to describe their optical properties. The chapter also provides examples of RT-based calculations for both BRF and spectral albedo in scenarios typically found in the cryosphere. Five simulation sets show how remotely measurable quantities depend on morphological and mineralogical properties of the medium (e.g., BRF for mixtures of snow and debris; spectral albedo variation for snow and carbon soot with varying grain size and particle concentration; and spectral variation of glacier lake water reflectance as a function of rock “flour” concentration)
Solving radiative transfer problems in highly heterogeneous media via domain decomposition and convergence acceleration techniques
No full textThis paper deals with finding accurate solutions for photon transport problems in highly heterogeneous media fastly, efficiently and with modest memory resources. We propose an extended version of the Analytical Discrete Ordinates method, coupled with domain decomposition-derived algorithms and non-linear convergence acceleration techniques. Numerical performances are evaluated using
a challenging case study available in the literature. A study of accuracy
versus computational time and memory requirements is reported for transport calculations that are relevant for remote sensing applications
In situ conservation of the wild relative of the common bean (Phaseolus vulgaris var. aborigineus) at the south of its neotropical distribution: environmental characterization of a population in central Argentina
No full textThe common bean (Phaseolus vulgaris L.) is a food of worldwide vital importance. Like any crop, the conservation of its wild relatives is essential to maintain the genetic variability needed for plant breeding. In situ conservation of such population has the additional benefit of generating new variations through the evolution of its natural environment. In 2004, wild populations of P. vulgaris var. aborigineus were found in the province of Córdoba (Argentina), being the southernmost specimen of its current distribution. In order to study the state and characterize the environment of such populations, vegetation censuses were conducted along a stretch of the Tanti stream-arroyo Tanti-(Punilla, Córdoba). Results showed that the wild bean has an intermediate to high constancy throughout the watercourse and its presence decreases upstream and away from the stream. Most cover took place in plots with scarce slope, high incidence of light and intense magnitude of floods. Vegetation develops in an environment surrounded by forests, meadows and intermediate physiognomy. Besides adventitious species, the studied area still has native species of high conservation value. Based on the analysis of this work, and considering the biogeographical significance of this population of wild bean, we conclude that this stretch of the studied stream is a priority area for the in situ conservation of P. vulgaris var. aborigineus.Fil: Sirolli, Horacio. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ecología, Genética y Evolución; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Drewes, Susana Ines. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Biodiversidad y Biología Experimental; ArgentinaFil: Picca, Pablo Ignacio. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Biodiversidad y Biología Experimental; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Kalesnik, Fabio Alberto. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ecología, Genética y Evolución; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin
Induced-field enhancement of band-structure effects in photoelectron spectra from Al surfaces by ultrashort laser pulses
No full textThe electron emission produced by the grazing incidence of ultrashort laser pulses on two faces of aluminum, Al(100) and Al(111), is investigated using the band-structure-based-Volkov (BSB-V) approximation. The present version of the BSB-V approach includes not only a realistic description of the surface interaction, accounting for band-structure effects, but also effects due to the induced potential that originates from the collective response of valence electrons to the external electromagnetic field. For both crystallographic orientations we found that the induced potential contributes to the emergence of band-structure signatures in the near-threshold region of photoelectron spectra. This result opens a window to scrutinize band-structure effects in metal surfaces via ultrashort-laser interactions.Fil: Rios Rubiano, Carlos Alberto. Comisión Nacional de Energía Atómica. Gerencia del Area Investigación y Aplicaciones No Nucleares. Gerencia de Física (Centro Atómico Balseiro). División Colisiones Atómicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; ArgentinaFil: Della Picca, Renata. Comisión Nacional de Energía Atómica. Gerencia del Area Investigación y Aplicaciones No Nucleares. Gerencia de Física (Centro Atómico Balseiro). División Colisiones Atómicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; ArgentinaFil: Mitnik, Dario Marcelo. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; ArgentinaFil: Silkin, Slava M.. Donostia International Physics Center; EspañaFil: Gravielle, Maria Silvia. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentin
Development and Preliminary Validation of an Electromyography-Scoring Protocol for the Assessment and Grading of Muscle Involvement in Patients With Juvenile Idiopathic Inflammatory Myopathies
No full textIntroduction: We performed a pilot study in order to investigate the feasibility of an electromyography (EMG)-scoring protocol for the assessment of disease activity in juvenile idiopathic inflammatory myopathies (JIIM). Methods: Children with JIIM followed up in a tertiary-level care center underwent standardized clinical, laboratory, and EMG assessment. An EMG-scoring protocol was devised by a consensus panel including a pediatric neurophysiologist and two pediatric rheumatologists, based on a combined score obtained as the sum of (1) the presence of denervation signs (fibrillation potentials) and (2) motor unit remodeling (mixed pattern of short- and long-duration motor unit action potentials). The EMG-scoring protocol was then validated following the Outcome Measures in Rheumatoid Arthritis Clinical Trials filter for outcome measures in rheumatology and the consensus-based standards for the selection of health measurement instruments methodology. Results: Thirteen children (77% females) were included in the study, with a median age of 10 years (interquartile range: 7-17 years) and median disease duration of 11.8 months (interquartile range: 2.1-44.5). A total of 39 EMG examinations were evaluated. A strong positive association between a standardized tool for muscle strength assessment and the combined score was observed. No significant associations were found with both creatine kinase and erythrocyte sedimentation rate levels. Discussion: Our EMG-scoring protocol is the first standardized and reproducible tool for the neurophysiologic evaluation and grading of muscle involvement in patients with JIIM and could provide relevant additional information in the assessment and follow-up of these rare conditions
En la oportunidad de una atmósfera autoritaria. El denodado trabajo memorial del Tte. Gral. Juan Bautista Picca entre la historia y la política.
No full textIn this article, the problem about the social construction of memory and the representations of the past is connected to agencies ‘issues that, in this sense, develop under specific time and space coordinates. Consequently, the fragments of some political and historiographic interventions of the main architect of historical culture in Río Cuarto city, Cordoba, Argentina, are historicized, during a time certainly affected by a dictatorial and reactive atmosphere in the middle of the Cold War. Throughout some clues related to Tte. General (R.E.) Juan Bautista Pica’s career
(1910-1986), it is possible to identify, describe and understand the ways in which a retired military man, belonging to “la Revolución Libertadora” and later also an active anti-communis, worked full time and hardly to promote a set of history policies, as a way to adapt his own identity in the act of reinforcing his personal political certainties and, besides as a possibility of becoming a subject of public action, capable of effectively
influencing the collective thinking, combining past and present on behalf of the nation.En este artículo el problema de la construcción social de la memoria y de representaciones del pasado se enlaza con el de las agencias que, en tal sentido, se desenvuelven bajo coordenadas temporo-espaciales específicas. Consecuentemente, se historizan los fragmentos de algunas intervenciones políticas e historiográficas del principal artífice de la cultura histórica en la ciudad de Río Cuarto, Córdoba, Argentina, durante un tiempo ciertamente connotado por una atmósfera dictatorial y reactiva en plena Guerra Fría. Mediante algunos indicios de la trayectoria del Tte. Gral. (R.E.) Juan Bautista Picca (1910-1986) se identifican, describen y comprenden las formas en que un militar retirado, hombre de la “Revolución Libertadora” y luego también activo anticomunista, trabajó a tiempo completo y densamente, para promover un conjunto de políticas de la historia y la memoria como forma de adecuar su propia identidad, en el acto de refuerzo de sus personales certezas políticas y, también, como forma de constituirse en un sujeto de acción pública capaz de incidir efectivamente en el plano colectivo: conjugando pasado y presente en nombre de la nación
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