THE ROLE OF GLOBAL RISK AVERSION IN EXPLAINING LATIN AMERICAN SOVEREIGN SPREADS

This paper explores the role of global risk aversion (GRA) and its main determinants, US economic growth and the US government bond yield, in explaining developments in Latin American sovereign spreads. We find that GRA is significant and positively related to Latin American sovereign spreads and that its impact varies across countries and over time. Those countries with the lowest risk, such as Chile, are more affected by GRA. Its relevance has also risen over time, particularly since the sharp change in the perception of risk stemming from the Enron scandal. Finally, an increase in both US economic growth and the US government bond yield are found to reduce sovereign spreads in most Latin American countries, while the opposite is true for US short-term interest rates.GLOBAL RISK AVERSION, SOVEREIGN SPREADS,LATIN AMERICA

THE ROLE OF GLOBAL RISK AVERSION IN EXPLAINING LATIN AMERICAN SOVEREIGN SPREADS

This paper assesses empirically whether global risk aversion (GRA) and some if its determinants (US economic growth and the US long term interest rates) explain developments in Latin American sovereign spreads. We find that GRA is significant and positively related to Latin American sovereign spreads and that its impact varies across countries and over time. Chile, with a lower sovereign risk, is relatively more affected. The opposite is true for Argentina, Ecuador and Venezuela. In addition, the influence of GRA on spreads has risen since the Enron scandal. Finally, both an increase in US economic growth and US long term interest rates are found to reduce spreads while the opposite is true for US short-term interest rates.global risk aversion, sovereign spreads, Latin America

Automatic picking and classification of acoustic emission event arrivals

Thesis (M.S.)--University of Oklahoma, 2010.Includes bibliographical references (leaves 160-163).Accurate automatic classification and picking of arrival times of events from acoustic emission (AE) signals is of considerable importance for rapid identification and location of seismic events. Due to the large number of digital signals that could be acquired during a simple experiment, manual classification and arrival picking become impractical and subjective. A system that detects and stores seismic signals generated during hydraulic fracturing (HF) experiments has been used in laboratory experiments to study the mechanism of HF. This system employs a combination of sensors, preamplifiers, signal conditioning unit and a data acquisition (DAQ) module attached to a personal computer (PC). The system captures the AE signals using a simple threshold value. External and internal noise due to the electronics, sensor coupling, reflections and echoes from the microseismic signals (MS) are captured too. In order to reduce the number of false AE signals, improve the processing time and obtain the most information from the HF processes, an automated solution has been developed to classify, pick the first arrival, and the polarization of AE signals that have been previously captured by the AE monitoring system

Quantum aspects of the gravitational-gauge vector coupling in the Ho\v{r}ava-Lifshitz theory at the kinetic conformal point

This work presents the main aspects of the anisotropic gravity-vector gauge coupling at all energy scales \i.e., from the IR to the UV point. This study is carry out starting from the 4+1 dimensional Ho\v{r}ava-Lifshitz theory, at the kinetic conformal point.The Kaluza-Klein technology is employed as a unifying mechanism to couple both interactions. Furthermore, by assuming the so-called cylindrical condition, the dimensional reduction to 3+1 dimensions leads to a theory whose underlying group of symmetries corresponds to the diffeomorphisms preserving the foliation of the manifold and a U(1) gauge symmetry. The counting of the degrees of freedom shows that the theory propagates the same spectrum of Einstein-Maxwell theory. The speed of propagation of tensorial and gauge modes is the same, in agreement with recent observations. This point is thoroughly studied taking into account all the $z=1,2,3,4$ terms that contribute to the action. In contrast with the 3+1 dimensional formulation, here the Weyl tensor contributes in a non-trivial way to the potential of the theory. Its complete contribution to the 3+1 theory is explicitly obtained. Additionally, it is shown that the constraints and equations determining the full set of Lagrange multipliers are elliptic partial differential equations of eighth-order. To check and assure the consistency and positivity of the reduced Hamiltonian some restrictions are imposed on the coupling constants. The propagator of the gravitational and gauge sectors are obtained showing that there are not ghost fields, what is more they exhibit the $z=4$ scaling for all physical modes at the high energy level. By evaluating the superficial degree of divergence and considering the structure of the second class constraints, it is shown that the theory is power-counting renormalizable

A multi-group SEIRA model for the spread of COVID-19 among heterogeneous populations

The outbreak and propagation of COVID-19 have posed a considerable challenge to modern society. In particular, the different restrictive actions taken by governments to prevent the spread of the virus have changed the way humans interact and conceive interaction. Due to geographical, behavioral, or economic factors, different sub-groups among a population are more (or less) likely to interact, and thus to spread/acquire the virus. In this work, we present a general multi-group SEIRA model for representing the spread of COVID-19 among a heterogeneous population and test it in a numerical case of study. By highlighting its applicability and the ease with which its general formulation can be adapted to particular studies, we expect our model to lead us to a better understanding of the evolution of this pandemic and to better public-health policies to control it

Gestión Estratégica de la Tecnología en el Predesarrollo de Nuevos Productos

The objective of this job is to propose a tool for innovation management in the Fuzzy Front End of New Product Development. The framework adopts a technology management approach. The method proposed parts from the establishment of technological fronts derived from the technological business strategy. For each front, relative technological maps of position of the business relating to the competitors and to the available technological and scientific knowledge are utilized. In these maps is contemplated the dimensions or attributes of the products, processes or services in which there is interest to develop knowledge trough a Technological Route of Exploration to increase the core competences of the business. The proposal is illustrated with a war room for SME of the chemical specialties sector.The objective of this job is to propose a tool for innovation management in the Fuzzy Front End of New Product Development. The framework adopts a technology management approach. The method proposed parts from the establishment of technological fronts derived from the technological business strategy. For each front, relative technological maps of position of the business relating to the competitors and to the available technological and scientific knowledge are utilized. In these maps is contemplated the dimensions or attributes of the products, processes or services in which there is interest to develop knowledge trough a Technological Route of Exploration to increase the core competences of the business. The proposal is illustrated with a war room for SME of the chemical specialties sector.The objective of this job is to propose a tool for innovation management in the Fuzzy Front End of New Product Development. The framework adopts a technology management approach. The method proposed parts from the establishment of technological fronts derived from the technological business strategy. For each front, relative technological maps of position of the business relating to the competitors and to the available technological and scientific knowledge are utilized. In these maps is contemplated the dimensions or attributes of the products, processes or services in which there is interest to develop knowledge trough a Technological Route of Exploration to increase the core competences of the business. The proposal is illustrated with a war room for SME of the chemical specialties sector