Search results for "el salvador"
showing 10 items of 19 documents
From “Mano Dura” to “Enfrentamiento Directo”: swings of public policies in El Salvador
2019
RESUMEN Introduccion: El presente trabajo analiza las cuatro principales politicas publicas de seguridad contra las pandillas en El Salvador: Mano Dura (2003-2004), Super Mano Dura (2004-2009), Tregua entre pandillas (2012-2014) y Enfrentamiento Directo (2014-2019). El objetivo es identificar la influencia de estas politicas sobre la violencia. Materiales y Metodos: Se trata de una investigacion cualitativa apoyada en 12 entrevistas y el relato de vida con las que se explora la responsabilidad gubernamental frente al problema de la violencia en El Salvador. El trabajo de campo se efectuo durante 7 meses, entre septiembre de 2016 y marzo de 2017. El tratamiento de la informacion se efectuo m…
Pandillas salvadoreñas y su impacto político y social: un análisis global
2021
El presente trabajo pretende explicar la violencia social que ha enfrentado la sociedad salvadoreña en las últimas dos décadas, desde un abordaje basado en tres ejes: políticas de seguridad ciudadana, impacto de la violencia en las comunidades y el desarrollo local, y la incidencia de las pandillas en la niñez, adolescencia y juventud salvadoreña. La producción científica del doctorando dio como resultado cuatro artículos publicados y uno aceptado pendiente de publicación. Estos artículos siguieron los ejes y objetivos de investigación planteados en los planes de investigación presentados al Programa de Doctorado. En las siguientes líneas se hace un breve resumen de cada una de las publicac…
Transition from mildly-tholeiitic to calc-alkaline suite: the case of Chichontepec volcanic centre, El Salvador, Central America
1998
Abstract The Chichontepec volcano is a Plio-Pleistocene composite volcano that erupted lavas ranging from high-alumina basalts to dacites. It experienced a caldera-forming paroxysmal eruption during the early Pleistocene. Pre-caldera lavas are mildly tholeiitic and they evolved mainly by low pressure crystal fractionation, notwithstanding the fact that most mafic lavas (low-MgO high-alumina basalts) retain traces of polybaric evolution. Conversely, post-caldera lavas, which are mainly pyroxene andesites, are clearly calc-alkaline, having evolved by open-system crystal fractionation. Sr–Nd isotopic data and trace elements characteristics indicate that the same mantle source was involved in t…
Cuando la epidemia se presentén esta capital, se hubieran hecho muchas promesas y sacrificios al Señor per verse libre de su rigor. El Todopoderoso h…
Signat a la fi: Gonzalo Carruana Data a la fi: Valencia 29 de noviembre de 1854
Resumen historico de la portentosa llegada de la imagen del Smo. Christo del Salvador à los muros de la ciudad de Valencia, contra las corrientes del…
1821
Text a 1 col. - Reclams Signatures: A-B2, C8 Grav. xil. de la imatge de l'altar del Crist de Sant Salvador en p. 3
Chromosomal variation and genome size support existence of cryptic species of Triatoma dimidiata with different epidemiological importance as Chagas …
2006
Summary The wide geographical distribution of Triatoma dimidiata, one of the three major vectors of Chagas disease, ranges from Mexico to northern Peru. Since this species occupies a great diversity of artificial and natural ecotopes, its eradication is extremely difficult. In order to assist control efforts, we used chromosome analyses and DNA amount as taxonomic markers to study genetic variability in populations of T. dimidiata from Mexico, Guatemala, El Salvador and Colombia. We differentiated three groups or cytotypes defined by characteristic chromosome C-banding patterns and genome size measured by flow cytometry. The three cytotypes are restricted to different geographic locations. …
Predicting depositional areas of landslide susceptibility comparing four datasets extracted from landslide area: a case of study after rainfall-induc…
Hurricane Ida and low-pressure system 96E crossed Central American countries in 2009. However, in El Salvador, the torrential rainfalls caused many flooding and landslides. As a result, over 200 causalities and the destruction of several villages, and bridges occurred along the mountain slopes. The remote analysis allowed us to prepare an inventory of landslides that occurred after the Hurricane in a basin located in the northern part of Ilopango Caldera. Five groups of data sets were created using selected pixels of each landslide area in order to evaluate the capacity to predict the lowest and the entire landslide area. Multivariate Adaptive Regression Splines (MARS) were employed to mode…
Mapping Susceptibility to Debris Flows Triggered by Tropical Storms: A Case Study of the San Vicente Volcano Area (El Salvador, CA)
2021
In this study, an inventory of storm-triggered debris flows performed in the area of the San Vicente volcano (El Salvador, CA) was used to calibrate predictive models and prepare a landslide susceptibility map. The storm event struck the area in November 2009 as the result of the simultaneous action of low-pressure system 96E and Hurricane Ida. Multivariate Adaptive Regression Splines (MARS) was employed to model the relationships between a set of environmental variables and the locations of the debris flows. Validation of the models was performed by splitting 100 random samples of event and non-event 10 m pixels into training and test subsets. The validation results revealed an excellent (…
Evaluation of debris flow susceptibility in El Salvador (CA): a comparison between Multivariate Adaptive Regression Splines (MARS) and Binary Logisti…
2018
In the studies of landslide susceptibility assessment, which have been developed in recent years, statistical methods have increasingly been applied. Among all, the BLR (Binary Logistic Regression) certainly finds a more extensive application while MARS (Multivariate Adaptive Regression Splines), despite the good performance and the innovation of the strategies of analysis, only recently began to be employed as a statistical tool for predicting landslide occurrence. The purpose of this research was to evaluate the predictive performance and identify possible drawbacks of the two statistical techniques mentioned above, focusing in particular on the prediction of debris flows. To this aim, an…
Predicting the landslides triggered by the 2009 96E/Ida tropical storms in the Ilopango caldera area (El Salvador, CA): optimizing MARS-based model b…
2019
The main topic of this research was to evaluate the effect in the performance of stochastic landslide susceptibility models, produced by differences between the triggering events of the calibration and validation datasets. In the Caldera Ilopango area (El Salvador), MARS (multivariate adaptive regression splines)-based susceptibility modeling was applied using a set of physical–environmental predictors and two remotely recognized landslide inventories: one dated at 2003 (1503 landslides), which was the result of a normal rainfall season, and one which was produced by the combined effect of the Ida hurricane and the 96E tropical depression in 2009 (2237 landslides). Both the event inventorie…