723 research outputs found
Polymetallic (Pb-Zn-Cu-Ag ± Au) vein-type deposits in brittle-ductile transtensional shear zones, Eastern Sierras Pampeanas (Argentina): Age constraints and significance for the Late Paleozoic tectonic evolution and metallogenesis
No full textThis paper discusses new structural, kinematic and geochronological data from polymetallic (Pb-Zn-Cu-Ag ± Au) vein-type deposits hosted in the metamorphic basement of the southern Sierras de Córdoba. A Carboniferous age was established for the hydrothermal event between ∼329 and 315 Ma (Late Mississippian-Early Pennsylvanian) by the K/Ar fine-fraction dating method of sericitic alteration related to metallic ore deposition in the Las Guindas and Oro districts. The obtained ages postdate the spatially associated Devonian magmatism and overlap the A-type Early Carboniferous magmatism defined for the Eastern Sierras Pampeanas. The presence of non-exhumed granitic bodies at shallow depths, possibly related to mineralization, is supported by available geophysical and field evidence. The strain fabric and 3-D kinematic analyses constitute first kinematic data for the Carboniferous basement of the Southern Sierras Pampeanas demonstrating that mineralization was controlled by NNW- and ENE-trending brittle-ductile transtensional shear zones that overprint the earlier high-strain deformation fabrics of the basement. Transtensional deformation has accommodated large amounts of strike-slip movements and subordinated extensional components. The calculated kinematic axes indicate a coherent kinematic pattern of the mineralized systems in the two studied districts, with a maximum extension direction oriented NNE- to NE and maximum shortening direction oriented WNW- to NW. This deformation regime, active during mineralization, point to a non-compressive setting at the Late Mississippian-Early Pennsylvanian boundary. In line with other regional evidence, we propose a distinctive Carboniferous deformational phase in the Eastern Sierras Pampeanas, dominated by transtension. This period would have occurred after the transition with the Devonian compressional/transpressional orogenic regime.Fil: Maffini, María Natalia. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas, Fisicoquímicas y Naturales. Departamento de Geología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; ArgentinaFil: Wemmer, Klaus. Universität Göttingen; AlemaniaFil: Radice, Stefania. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas, Fisicoquímicas y Naturales. Departamento de Geología; ArgentinaFil: Oriolo, Sebastián. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; ArgentinaFil: D'eramo, Fernando Javier. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas, Fisicoquímicas y Naturales. Departamento de Geología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; ArgentinaFil: Coniglio, Jorge Enrique. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas, Fisicoquímicas y Naturales. Departamento de Geología; ArgentinaFil: Demartis, Manuel. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas, Fisicoquímicas y Naturales. Departamento de Geología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; ArgentinaFil: Pinotti, Lucio Pedro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas, Fisicoquímicas y Naturales. Departamento de Geología; Argentin
Lucio Fauno: “Alli lettori”, in: Delle antichità della citta di Roma, raccolte e scritte da M. Lucio Fauno con somma brevità, et ordine, con quanto gli Antichi ò Moderni scritto ne hanno, Libri V. (Venezia 1548) (FONTES 13)
No full textAt the end of his book, 'Delle antichità della città di Roma' (Venezia 1548), the author, Lucio Fauno, appends a postscript in which he addresses his readers (“Alli Lettori”) concerning a then bitter controversy about the correct location of the Roman Forum. In contrast to a widely-held view that located the Forum between the Capitoline Hill and the Arch of Titus, Pirro Ligorio, and his friends, Gabriele Faerno and Benedetto Egio, advocated a position that relocated the Forum between the Capitoline Hill and the Palatine. This contradicted the prevailing consensus, as it was established in the Topographia Antiquae Romae (1534) of Bartolomeo Marliani. Fauno’s arguments refute the Ligorian postion, in defence of his own description of Roman topography provided in his book of the Antichità di Roma. In the course of time Ligorio’s relocation of the Forum proved to be wrong. In the discussion of ‘Lucio Fauno’, it is shown that this name is a pseudonym for the writer and antiquarian, Giovanni Tarcagnota of Gaeta (d. 1566)
Water quality assessment using multivariate statistical techniques in Río Tercero Reservoir, Argentina
No full textWater quality monitoring programs generate complex multidimensional data sets. In this study, multivariate statistical techniques were employed as an effective tool for the analysis and interpretation of these water quality data sets. Principal component analysis (PCA) and cluster analysis (CA) were applied to evaluate spatial and temporal variation of water quality in Río Tercero Reservoir (Argentina). Six sampling sites were surveyed each climatic season for 21 parameters during 2003-2010. The results revealed that PCA showed the existence of four significant principal components (PCs) which account for 96.7% of the total variance of the data set. The first PC was assigned to mineralization whereas the other PCs were built from variables indicative of pollution. Hierarchical CA grouped the six monitoring sites into three clusters and classified the different climatic seasons into two clusters based on similarities in water quality characteristics.Fil: Bonansea, Matias. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina. Universidad Nacional de Río Cuarto. Facultad de Agronomía y Veterinaria; ArgentinaFil: Ledesma, Claudia. Universidad Nacional de Río Cuarto. Facultad de Agronomía y Veterinaria; ArgentinaFil: Rodriguez, Claudia. Universidad Nacional de Río Cuarto. Facultad de Agronomía y Veterinaria; ArgentinaFil: Pinotti, Lucio Pedro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas, Fisicoquímicas y Naturales. Departamento de Geología; Argentin
Five Easy Pieces dedicated to Ludovico Quaroni
No full textThe first edition of this book was published in Italian in 1989, about two years after the death of Ludovico Quaroni; this edition in English is addressed mainly to non-Italian scholars with an interest in modern architecture in Italy. Given the imperfect parallel between musical and literary composition, therefore, in this book an intimate intellectual atmosphere prevails, which reveals the author’s skill in creating a narrative and also in engaging in a type of critical writing that is rarely undertaken by architect-intellectuals. The five episodes in the book cover almost thirty years, from 1958 to 1987, which were years that remained deeply preserved in the author’s memory. The literary form of the pieces gives all of them a common structure: they are dialogues; usually consisting of brief exchanges of few words, spoken or written, between the author (Lucio Barbera) and Quaroni. In one of them – Charisma – the dialogue takes place between Quaroni and a larger chorus. In another – Elective Misunderstanding – we have a double dialogue at a distance, a trio, if we return to the musical metaphor, between Quaroni, Lodovico Barbiano di Belgiojoso and Barbera. The last piece is a longer conversation by Quaroni on himself; a taking stock and a valediction. On the frontispiece, Barbera gives a clear indication of his intentions: “For students of Architecture who are well-educated and for architects interested in getting to know better a Master of their trade”
Using multi-temporal Landsat imagery and linear mixed models for assessing water quality parameters in Río Tercero reservoir (Argentina)
No full textThe application of remote sensing technology to water quality monitoring has special significance for lake management at regional scales. Many studies have proposed algorithms between Landsat data and in-situ water quality parameters using classical regression models. The novelty of this paper is that we developed algorithms to determine log-transformed chlorophyll-a concentration (Chl-a) and Secchi disk transparency (SDT) in Río Tercero reservoir using Landsat TM and ETM+ imagery, ancillary environmental factors and linear mixed models (LMM), obtaining an increase in the accuracy of the estimates. The validation results showed that LMM with spatial correlation structure that take into account water surface temperature (WST) and rainfall were the most suitable method for estimating these parameters. WST derived from the Landsat thermal band was also validated. The algorithms were used to generate quantitative maps providing spatially and temporally rich information on patterns of water quality throughout the reservoir. Water quality features related to the hydrogeomorphology of the reservoir, typical seasonality and influx from the cooling system of a local nuclear reactor were identified in the time series maps.Fil: Bonansea, Matias. Universidad Nacional de Rio Cuarto. Facultad de Agronomia y Veterinaria. Cátedra de Ecología; Argentina. Universidad Nacional de Rio Cuarto. Facultad de Cs.exactas Fisicoquimicas y Naturales. Instituto de Ciencias de la Tierra, Biodiversidad y Ambiente. - Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Conicet - Cordoba. Instituto de Ciencias de la Tierra, Biodiversidad y Ambiente.; ArgentinaFil: Rodriguez, Claudia. Universidad Nacional de Rio Cuarto. Facultad de Agronomia y Veterinaria. Cátedra de Ecología; ArgentinaFil: Pinotti, Lucio Pedro. Universidad Nacional de Rio Cuarto. Facultad de Cs.exactas Fisicoquimicas y Naturales. Instituto de Ciencias de la Tierra, Biodiversidad y Ambiente. - Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Conicet - Cordoba. Instituto de Ciencias de la Tierra, Biodiversidad y Ambiente.; Argentina. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas, Fisicoquímicas y Naturales. Departamento de Geología; ArgentinaFil: Ferrero, Susana Beatriz. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas, Físico-Químicas y Naturales. Departamento de Matemática; Argentin
Toward a new paradigm in open economy modeling: where do we stand?
No full textThis paper provides a selective, up-to-date survey of the recent, fast-growing literature on new open economy macroeconomics. Lucio Sarno begins with a review of the seminal paper in this literature, describing the baseline model proposed therein. He then covers a number of variants and generalizations of the baseline model involving the allowance for nominal rigidities, pricing to market, alternative preference specifications, and alternative financial markets structures. The author also discusses the recent stochastic extensions of these models, especially focusing on their implications for the link between risk and exchange rates and on new directions for the relevant literature.Econometric models ; Macroeconomics
CORRELATION BETWEEN NAILFOLD VIDEOCAPILLAROSCOPY PATTERNS, LEFT VENTRICLE DYSFUNCTION AND PULMONARY DISEASE IN SYSTEMIC SCLEROSIS,
No full textBackground: Systemic Sclerosis (SSc) is a multisystem connective disease characterized by a microvascular damage, which leads to systemic fibrosis, immune dysregulation and progressive involvement of internal organs [1].
According to the classification of the morphological aspects, into the scleroderma pattern proposed by Cutolo et al. are described the early, active and late patterns.
Objectives: The aim of our study is thus to report a correlation between specific nailfold videocapillaroscopy pattern and internal organ involvement.
Methods: All enrolled patients were diagnosed for SSc, according to the American College of Rheumatology criteria and underwent an echocardiographic examination and a nailfold videocapillaroscopy.
Myocardial function parameters considered were: global contractility (computed with the Simpson method), linear contractility (computed through the MAPSE) [2], diastolic dysfunction (through the analysis of the trans-mitral flow) [3]; whilst those of lung damage were: PAPs and the evaluation of the right ventricle contractility through the TAPSE [4].
Statistics were performed with SPSS 20 software, by using the Mann Whitney U Test and the Fisher Test.
Results: We enrolled 27 patients, of which 16 showing “active pattern” and 11 “early pattern”, compared to a group of 21 healthy controls.
Of the 11 patients belonging to the “early” group, 1 resulted affected by diastolic dysfunction, whilst 3 had pulmonary hypertension, defined by PAPs ≥40 mmHg [4] (early vs controls; p=0.03). In the 16 patients of the “active” group. instead, 5 were found to have a diastolic dysfunction (active vs controls; p=0.01) and 6 pulmonary hypertension (active vs controls; p=0.003). In the group with “active” pattern we also observed a reduction in TAPSE compared to the control group (2,0 ± 0,2 vs 2,2 ± 0,2; p=0,025) and compared to the group with early pattern (2,0 ± 0,2 vs 2,2 ± 0,3; p=0,07).
No presence of modifications in the global contractility emerged; however, we observed a progressive reduction of the MAPSE (controls 1.76 ± 0,08; early 1.57 ± 0,04; active 1.49 ± 0,12), which resulted statistically significant among the different comparisons (controls vs early p=0.001; controls vs active p=0.0001; early vs active p=0.04).
Conclusion: The analyses showed a strict correlation between the severity of the microvascoular alterations, reported by nailfold videocapilloroscopy, and the severity of the cardiopulmonary damage, expressed by an increase in the percentage of pulmonary hypertension, diastolic dysfunction and a progressive reduction of MAPSE and TAPSE.
Abstract AB1155 Table 1
early vs controls
EARLY CONTROLS P
PAPs 32,3 ± 5,4 22,6 ± 6,7 0,0001
TAPSE 2,2 ± 0,3 2,2 ± 0,2 NS
MAPSE 1,57 ± 0,04 1,76 ± 0,08 0,0001
EF 65 ± 4 64 ± 2,7 NS
E/A 1,34 ± 0,2 1,38 ± 0,19 NS
DECT 148 ± 23 163 ± 27 NS
Diastolic dysfunction 1(11) 0(21) 0,3
Pulmonary hypertension 3(11) 0(21) 0,03
Abstract AB1155 Table 2
active vs controls
ACTIVE CONTROLS P
PAPs 34 ± 7,8 22,6 ± 6,7 0,0001
TAPSE 2,0 ± 0,2 2,2 ± 0,2 0,025
MAPSE 1,49 ± 0,12 1,76 ± 0,08 0,0001
EF 65 ± 4 64 ± 2,7 NS
E/A 1,34 ± 0,4 1,38 ± 0,19 NS
DECT 157 ± 24 163 ± 27 NS
Diastolic dysfunction 5(16) 0(21) 0,01
Pulmonary hypertension 6(16) 0(21) 0,003
REFERENCES:
[1] LeRoy EC. Systemic sclerosis. A vascular perspective. Rheum Dis Clin North Am.
[2] Ibadete Bytci, Left atrial change in early stages of heart failure with preserved ejection fraction. Echocardiography
[3] Sherif F. Recommendations for the Evaluation of Left Ventricular Diastolic Function by Echocardiography. Journal of the American Society of Echocardiography
[4] Luke S. Howard, Echocardiographic assessment of pulmonary hypertension: standard operating procedure. European Respiratory Revie
Effects of atmospheric correction of Landsat imagery on lake water clarity assessment
No full textEmpirical relationships between Landsat data and water clarity expressed in terms of Secchi disk transparency (SDT) have been widely used for monitoring and assessment of water quality. The atmosphere affects differently sensor bands depending on the waveband, thus affecting the relationships obtained from top-of-atmosphere reflectance. The objective of this study was to evaluate whether the reliability of water clarity can be improved applying atmospheric correction of Landsat imagery. Further, a general predictive algorithm to determine water clarity in the reservoir was developed. Samples of SDT were taken from Río Tercero reservoir (Argentina). Landsat images were atmospheric corrected using the 6S code. Estimated values of SDT with and without atmospheric correction were compared for their differences. Results suggested that atmospheric corrected values of Landsat band 3 and the ratio 1/3 proved to be the best predictor of water clarity in the reservoir (R 2 = 0.84). Using the 6S code we demonstrate the usefulness of atmospheric correction to Landsat data since water clarity algorithm using surface reflectance was more reliable than the top-of atmosphere reflectance model.Fil: Bonansea, Matias. Universidad Nacional de Río Cuarto; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; ArgentinaFil: Ledesma, Claudia. Universidad Nacional de Río Cuarto; ArgentinaFil: Rodriguez, Maria Claudia. Universidad Nacional de Río Cuarto; ArgentinaFil: Pinotti, Lucio Pedro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; ArgentinaFil: Homem Antunes, Mauro. Universidade Federal Rural do Rio de Janeiro; Brasi
Multivariate statistical analysis for estimating surface water quality in reservoirs
No full textRegular water quality monitoring programs are an important aspect of water management. Different multivariate statistical techniques were applied for interpretation and evaluation of the data matrix obtained during a six years monitoring program (2006 to 2011) in the principal reservoirs of the central region of Argentina. Eleven sampling sites located in two reservoirs were surveyed each climatic season for 18 parameters. Cluster analysis grouped the sampling sites into three clusters and classified the different climatic seasons into two clusters based on their similarities. Principal component analysis/factor analysis showed the existence of five significant varifactors (VF) which account for 79.3 % of the variance, related to soluble salts, nutrients, physico-chemical parameters, and non-common source. Source contribution was calculated using multiple regression of sample mass concentration on the absolute VF scores. This study demonstrates the usefulness of multivariate statistical techniques helping managers to get better information about surface water systems.Fil: Bonansea, Matias. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Rio Cuarto. Facultad de Agronomia y Veterinaria. Cátedra de Ecología; ArgentinaFil: Bazan, Raquel. Universidad Nacional de Córdoba. Secretaria de Ciencia y Tecnología. Instituto Superior de Estudios Ambientales; Argentina. Universidad Nacional de Córdoba. Facultad de Cs.exactas Físicas y Naturales. Departamento de Química Industrial y Aplicada; ArgentinaFil: Ferrero, Susana. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas, Físico-Químicas y Naturales. Departamento de Matemática; ArgentinaFil: Rodriguez, Claudia. Universidad Nacional de Río Cuarto. Facultad de Agronomía y Veterinaria; ArgentinaFil: Ledesma, Claudia. Universidad Nacional de Río Cuarto. Facultad de Agronomía y Veterinaria; ArgentinaFil: Pinotti, Lucio Pedro. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas, Fisicoquímicas y Naturales. Departamento de Geología; Argentin
Estimation of chlorophyll-a concentration using Landsat 8 in the Cassaffousth reservoir
No full textThe physico-chemical and biological composition of a reservoir's effluents directly influences water quality. The values of variables such as high values of concentrations of chlorophyll-a (Chl-a) are indicators of pollution. The objective of this work was to monitor the trophic status and water quality of the Cassaffousth reservoir (Córdoba, Argentina) through the development of statistical models based on field data and satellite information. During 2016 and 2017, samples were taken bimonthly. Seven sampling sites were selected and physico-chemical and biological parameters were assessed. By using regression techniques, Landsat 8 information was related with field data to construct and validate a statistical model to determine the distribution of Chl-a in the reservoir (R2 = 0.87). The generated algorithm was used to generate maps which contained information about the dynamics of Chl-a in the entire reservoir. Remote sensing techniques can be used to expand the knowledge of the dynamics of the Cassaffousth reservoir. Moreover, these techniques can be used as baselines for the development of an early warning system for this and other reservoirs in the region.Fil: Ledesma, María Micaela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina. Universidad Nacional de Río Cuarto. Facultad de Agronomía y Veterinaria. Departamento de Estudios Básicos y Agropecuarios; ArgentinaFil: Bonansea, Matias. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Instituto de Ciencias de la Tierra, Biodiversidad y Ambiente - Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Ciencias de la Tierra, Biodiversidad y Ambiente; ArgentinaFil: Ledesma, Claudia. Universidad Nacional de Río Cuarto; ArgentinaFil: Rodríguez, Claudia. Universidad Nacional de Río Cuarto; ArgentinaFil: Carreño, Joel. Universidad Nacional de Río Cuarto; ArgentinaFil: Pinotti, Lucio Pedro. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Instituto de Ciencias de la Tierra, Biodiversidad y Ambiente - Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Ciencias de la Tierra, Biodiversidad y Ambiente; Argentin
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