1,721,239 research outputs found
Que el mundo sea otro, aunque parezca el mismo
Full text linkFil: Rossi, Laura. Universidad de Buenos Aires. Buenos Aires; Argentin
El compuesto de coordinación [/FeBr3/2/DMSO/3] como catalizador en reacciones orgánicas
Full text linkTesis (Dr. en Ciencias Químicas)--Universidad Nacional de Córdoba. Facultad de Ciencias Químicas, 1997.Fil: Rossi, Laura Isabel. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Departamento de Química Orgánica; Argentina.Fil: Rossi, Laura Isabel. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigaciones en Fisicoquímica de Córdoba; Argentina.A partir de la década del 50, la síntesis orgánica ha tenido diferentes niveles de sofisticación debido a la confluencia de varios factores: formulación de mecanismos detallados de reacciones orgánicas fundamentales, introducción del análisis conformacional de estructuras orgánicas, y de estados de transición basados en principios estereoquímicos, desarrollo de la Espectroscopía y otros métodos físicos aplicables al análisis estructural, uso de métodos cromatográficos de análisis y separación y, finalmente, descubrimiento y aplicación de nuevos reactivos químicos selectivos. En este último punto podemos ubicar a los compuestos de coordinación. Aunque la historia reseñe la aparición de los complejos metálicos en 1798 cuando Tassaert accidentalmente descubrió el cloruro de hexami ncobalto( III), CoCI3.6NH3; o el azul de Prusia, KCN.Fe(CN)2.Fe(CN)3, obtenido en Berlín a principios del siglo XVIII por Diesbach, fabricante de colores para artistas, estos complejos han sido estudiados sistemáticamente recién en las últimas décadas del presente siglo. Los compuestos de coordinación desempeñan un papel esencial en la industria química y en la vida misma. En el primer caso, por ejemplo, tenemos al catalizador de Ziegler-Natta, un complejo de los metales aluminio y titanio, utilizado en el proceso de polimerización de etileno a bajas presiones. Por este trabajo, los autores recibieron el Premio Nobel de Química correspondiente al año 1963. Entre los compuestos de coordinación naturales que se pueden citar se encuentran la clorofila, un complejo de magnesio vital para la fotosíntesis de las plantas y, la hemoglobina, un complejo de hierro portador de oxígeno a las células animales.Fil: Rossi, Laura Isabel. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Departamento de Química Orgánica; Argentina.Fil: Rossi, Laura Isabel. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigaciones en Fisicoquímica de Córdoba; Argentina
Principles of Soft Metrology and measurement procedures in humans
No full textThe current work represent both a compendium of ideas around Soft Metrology - the set of techniques and models for measuring quantities related to human perception - and a collection of personal abstracted articles on specific experiments conducted during the Ph.D. course. This thesis is not going to represent a review of all theories of perception, a key topic of the history of philosophy. Since Plato and Boethius, passing through all the history of Greek and Indian ancient philosophy, getting to the modern era with Descartes and Hume until reaching contemporary philosophy of mind, human perception has been always a central topic of thought as a key epistemological problem, i.e. deeply related to formation of knowledge. Therefore, we will not describe all these theories here. On the contrary, some specific theoretical interpretation of the relation human-physical world will be presented, exclusively depending on how much they are useful to the foundations of a specific line of reasoning pertinent to the metrological scope. The thesis is subdivided in three parts. The first one is dedicated to the background of Soft Metrology coming from the representational theory of metrology, and particularly the work of the MINET (Measuring the Impossible Network) the European cross disciplinary network for the measurement of perceptual qualities. Here, an overview of field of application and economical relevance of soft metrology is given. The second part is the core of the work and is dedicated to original hypothesis, interpretation proposals and methodological tools. Here are presented the salient findings of the research and suggestions for future advancements. The third part is dedicated to a description of the main experimental research activity done during these three year
Modelado espacio-temporal del riesgo de femicidios en Argentina utilizando utilizando splines penalizados
Full text linkFil: Vicente, Gonzalo. Universidad Nacional de Cuyo. Facultad de Ciencias Económicas; Argentina. Universidad Pública de Navarra. Departamento de Estadística, Informática y Matemáticas; España.Fil: Rossi, Laura. Universidad Nacional de Cuyo. Facultad de Ciencias Económicas; Argentina.La violencia de género es un tema candente en estos días. Este es un problema grave que debe abordarse porque, de acuerdo a lo declarado por la Organización Mundial de la Salud, la violencia contra la mujer es un “problema de salud pública de proporciones epidémicas que requiere medidas urgentes”. Los crímenes contra las mujeres son un problema social muy difícil de comprender debido a los intrincados factores involucrados. En este trabajo enfocamos la atención en Argentina, y nuestro interés se basa en analizar los riesgos de femicidios a nivel de provincia por semestres durante el período 2013-2019. El estudio de la distribución geográfica de la incidencia delictiva y su evolución en el tiempo busca identificar regiones específicas que presenten un mayor riesgo. Se utilizan modelos de P-splines que incluyen componentes espaciales, temporales y espacio-temporales para estimar los riesgos de incidencia. El ajuste y la inferencia para todos los modelos se han llevado a cabo dentro del marco general bayesiano siguiendo un enfoque completamente de Bayesiano, utilizando INLA.Fil: Vicente, Gonzalo. Universidad Nacional de Cuyo. Facultad de Ciencias Económicas; Argentina. Universidad Pública de Navarra. Departamento de Estadística, Informática y Matemáticas; España.Fil: Rossi, Laura. Universidad Nacional de Cuyo. Facultad de Ciencias Económicas; Argentina
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
The politics of selective preservation: a study of causes and consequences of cultural heritage destruction during peace : the cases of Afghanistan, Egypt and Libya
No full textThis study seeks to analyze the causes and consequences of cultural heritage destruction during times of peace. Its purpose is to bring attention to causes of cultural heritage destruction that might be less evident but are nonetheless as destructive as violent conflicts. I will attempt to illustrate the relevance of this research by considering the cases of three countries affected by cultural heritage destruction during peace: Afghanistan, Libya, and Egypt. These countries have been selected because of their similar socio-political history and their recent involvement in conflicts that led to the destruction of a portion of their heritage. These common characteristics facilitate the analysis by eliminating variables that might be created by cultural discrepancies, historic differences and the war/peace context. The presence of both destruction during war and destruction during peace illustrates the similarities and differences of the two phenomena. In order to investigate the causes leading to destruction of heritage during peaceful times, I will consider the role played by governments in setting patterns of selective preservation and the way in which this process has come to affect the local’s perception of cultural identity. Furthermore, I will look at the role of local populations, governments and international organization in guaranteeing the preservation of cultural heritage. Finally, I will recommend the implementation of programs fostering the preservation of a comprehensive cultural patrimony that is truly representative of each nation’s cultural identity.M.A.Includes bibliographical referencesby Laura Ross
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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