2,808 research outputs found
Dataset of SEM images, modelled isopach map and topographic profiles, radiocarbon ages and data of parameters of Tephra2 and AshCalc codes of Holocene volcanic ashes of NW Argentina
No full textMaterial suplementario (Figuras S1-S4 y Tablas S1-S4 del artículo Fernandez-Turiel, J.-L.; Perez-Torrado, F. J.; Rodriguez-Gonzalez, A.; Saavedra, J.; Carracedo, J. C., Rejas, M.; Lobo, A.; Osterrieth, M.; Carrizo, J. I.; Esteban, G.; Gallardo, J.; Ratto, N. (2019). The large eruption 4.2 ka cal BP in Cerro Blanco, Central Volcanic Zone, Andes: Insights to the Holocene eruptive deposits in the southern Puna and adjacent regions. Estudios Geológicos 75(1): e088. https://doi.org/10.3989/egeol.43438.515This dataset compiles SEM images, modelled isopach map and topographic profiles, and data of radiocarbon ages, parameters of Tephra2 and AshCalc codes of Holocene volcanic ashes of of Southern Puna and neighbouring areas (NW Argentina). SEM images detail differences among the Bolsón de Fiambalá, Cerro Blanco and Cueros de Purulla fallout ash deposits. Tephra2 code was used to simulate the ash fallout, and the AshCalc code to compare different methods for ash volume estimates associated with the 4.2 ka cal BP eruption of the Cerro Blanco Volcanic Complex. Topographic profiles are used to explain the secondary thickening of fallout ash deposits.MINECO, CGL2011-23307, Proyecto QUECAPeer reviewe
Leaving a footprint: Stories of evaluations that made a difference
No full textEvaluation is the systematic process of assessment and critical analysis of projects, programmes, policies, or other types of social interventions. For that purpose, evaluations (a) apply methodologies aimed at assessing whether the design, management, and results produced are consistent with what had originally been anticipated; (b) assess whether the actions carried out were suitable in order to produce the desired changes, identifying contextual factors that had bearing on the results; and (c) obtain evidence that backs up the evaluative judgement.Fil: Rodriguez Bilella, Pablo Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan; Argentina. Universidad Nacional de San Juan. Facultad de Ciencias Sociales. Instituto de Investigaciones Socioeconómicas; ArgentinaFil: Tapella, Esteban. Universidad Nacional de San Juan; Argentin
Some reflections on the orientations and volume of accounting history research in the 21st century.
No full textEste artículo toma como punto de partida el 8th World Congress of Accounting Historians e intenta identificar las orientaciones que la investigación en historia de la contabilidad ha seguido desde entonces, es decir, desde el año 2000 hasta el 2007, los primeros años del siglo XX. El principal propósito de este ensayo es averiguar si ha habido novedades significativas en las direcciones de la investigación o, si por el contrario, su desarrollo ha seguido el curso previsible. Trataremos de asociar este propósito al estudio del volumen de la investigación publicada a este respecto en las principales revistas de contabilidad. Después de haber examinado y descrito la evolución de la historia de la contabilidad en estos primeros años del presente siglo, presentaremos algunas consideraciones personales acerca de los derroteros en que la investigación podría moverse en el próximo futuro. Taking as starting point the 8th World Congress of Accounting Historians this paper attempts to identify the orientations followed by accounting history research in the first years of the 21st century, that is, from 2000 up to 2007. The main purpose of the attempt is to find out whether there have been significant novelties in the directions of research or, on the contrary, its development has run in the foreseeable course. We shall try to associate this purpose to the study of the amount of related research published in the main accounting journals. After having examined and described the developments of accounting history research in the first years of present century, the paper presents some considerations on the directions in which research should move in the next future.Historia de la contabilidad, investigación, tendencias, siglo XXI. Accounting History, research, orientations, 21st century.
Design and Verification of an open-source SFU model for GPGPUs
No full textGeneral Purpose Graphic Processing Units (GPGPUs) are widely used in data-intensive applications, such as multimedia and high-performance computing. These technologies are currently used also to support safety-critical applications (e.g., in the automotive and industrial domains) to implement computer vision, sensor fusion, or machine learning algorithms, which often require the processing of complex transcendent or trigonometric functions. In these cases, an integrated special function unit in the GPGPU is utilized, which is intended to increase the performance in parallel operations. However, this complex module is not present in most of the available architectural and micro-Architectural open-source models of GPGPUs, so limiting the characterization and analysis of applications using these units. In this work, we report about the design and functional verification of a Special Function Unit to execute transcendent and trigonometric operations in GPGPUs. We integrated the proposed module within an open-source GPGPU (FlexGripPlus) implementing the G80 micro-Architecture. The experimental results show the significant improvements in performance and accuracy achievable by using these modules in parallel applications running in a GPGPU
A Novel Model of Acute Myocardial Ischemia in Human Ventricular Cardiomyocytes
No full textAcute myocardial ischemia is known to be a pathology with a high mortality worldwide. In the last decades, computational simulation has been a widely used tool to study the electrophysiological effects of ischemia. In this work, we present an up-to-date model of the effects of myocardial ischemia in the action potential which includes more ischemia-affected current alterations than any other previously published model. The model was used to simulate action potentials during a 10-minute period of dynamic ischemia, and the main biomarkers of the action potential were monitored, as well as the extracellular potassium elevation. The results agree with those obtained experimentally, suggesting that the model can be useful for 3D simulations of acute myocardial ischemia
Dejar huella: historias de evaluaciones que marcaron la diferencia
No full textLa evaluación es el proceso sistemático de valoración y análisis crítico de proyectos, programas, políticas u otro tipo de intervención social. Para ello, las evaluaciones: (a) aplican metodologías tendientes a valorar si el diseño, la gestión y los resultados producidos son consistentes con lo originalmente previsto; (b) valoran si las acciones ejecutadas fueron adecuadas para producir los cambios al identificar los factores de contexto que inciden en los resultados y (c) obtienen evidencias que fundamenten el juicio evaluativo. La práctica de la evaluación no sigue un método único, sino que existe una pluralidad de estrategias metodológicas, alcances y destinatarios (autoridades, técnicos intermedios, medios de comunicación, organizaciones de la sociedad civil y la ciudadanía en general). Sus resultados entregan insumos para la toma de decisiones, contribuyen al aprendizaje de equipos y organizaciones y acrecientan el conocimiento de los problemas que son objeto de la acción pública.Fil: Rodriguez Bilella, Pablo Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan; Argentina. Universidad Nacional de San Juan. Facultad de Ciencias Sociales. Instituto de Investigaciones Socioeconómicas; ArgentinaFil: Tapella, Esteban. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan; Argentina. Universidad Nacional de San Juan. Facultad de Ciencias Sociales. Instituto de Investigaciones Socioeconómicas; Argentin
Macrocyclic Pyclen-Based Gd3+ Complex with High Relaxivity and pH Response
No full textWe report the synthesis and characterization of the macrocyclic ligand 2,2′-((2-(3,9-bis(carboxymethyl)-3,6,9-triaza-1(2,6)-pyridinacyclodecaphane-6-yl)ethyl)azanediyl)diacetic acid (H4L) and several of its complexes with lanthanide ions. The structure of the free ligand was determined using X-ray diffraction measurements. Two N atoms of the pyclen moiety in the trans position are protonated in the solid state, together with the exocyclic N atom and one of the carboxylate groups of the ligand. The relaxivity of the Gd3+ complex was found to increase from 6.7 mM-1 s-1 at pH 8.6 to 8.5 mM-1 s-1 below pH ≈ 6.0. Luminescence lifetime measurements recorded from H2O and D2O solutions of the Eu3+ complex evidence the presence of a single complex species in solution at low pH (a5.0) that contains two inner-sphere water molecules. DFT calculations suggest that the coordination environment of the Ln3+ ion is fulfilled by the four N atoms of the pyclen unit, two oxygen atoms of the macrocyclic acetate groups, and an oxygen atom of an exocyclic carboxylate group. The two inner-sphere water molecules complete coordination number nine around the metal ion. At high pH (a9.3), the lifetime of the excited 5D0 level of Eu3+ displays a biexponential behavior that can be attributed to the presence of two species in solution with hydration numbers of q = 0 and q = 1. The 1H NMR and DOSY spectra recorded from solutions of the Eu3+ and Y3+ complexes reveal a structural change triggered by pH and the formation of small aggregates at high pH values
Mn2+ Complexes Containing Sulfonamide Groups with pH-Responsive Relaxivity
No full textWe present two ligands containing a N-ethyl-4-(trifluoromethyl)benzenesulfonamide group attached to either a 6,6′-(azanediylbis(methylene))dipicolinic acid unit (H3DPASAm) or a 2,2′-(1,4,7-triazonane-1,4-diyl)diacetic acid macrocyclic platform (H3NO2ASAm). These ligands were designed to provide a pH-dependent relaxivity response upon complexation with Mn2+ in aqueous solution. The protonation constants of the ligands and the stability constants of the Mn2+ complexes were determined using potentiometric titrations complemented by spectrophotometric experiments. The deprotonations of the sulfonamide groups of the ligands are characterized by protonation constants of log KiH = 10.36 and 10.59 for DPASAm3- and HNO2ASAm2-, respectively. These values decrease dramatically to log KiH = 6.43 and 5.42 in the presence of Mn2+, because of the coordination of the negatively charged sulfonamide groups to the metal ion. The higher log KiH value in [Mn(DPASAm)]- is related to the formation of a seven-coordinate complex, while the metal ion in [Mn(NO2ASAm)]- is six-coordinated. The X-ray crystal structure of Na[Mn(DPASAm)(H2O)]·2H2O confirms the formation of a seven-coordinate complex, where the coordination environment is fulfilled by the donor atoms of the two picolinate groups, the amine N atom, the N atom of the sulfonamide group, and a coordinated water molecule. The lower conditional stability of the [Mn(NO2ASAm)]- complex and the lower protonation constant of the sulfonamide group results in complex dissociation at relatively high pH (<7.0). However, protonation of the sulfonamide group in [Mn(DPASAm)]- falls into the physiologically relevant pH window and causes a significant increase in relaxivity from r1p = 3.8 mM-1 s-1 at pH 9.0 to r1p = 8.9 mM-1 s-1 at pH 4.0 (10 MHz, 25 °C)
Segunda. - “Vocee educativas”.
No full textSEGUNDA.- “Voces educativas”, creado por la C. Pilar Alejandra García Muñoz, Ingrid Arely Rodriguez Cano y Esteban Godoy Gil ,estudiantes inscritos en el Programa de Publicidad en la DMCU.
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