How Do Business Schools compete in Latin America?Stability and Best Predictors of Success for the AmericaEconomia MBA Ranking

The main aim of this paper is to present a longitudinal analysis of the changes in the AmericaEconomia MBA Rankings for the period 2005-2014. The AmericaEconomia ranking was the first international ranking specifically devoted to Latin American business schools, and with data gathered from this ranking we build a panel to study its stability and the main determinants of a school’s position in such ranking during the period under study. The final aim of this study is to examine the reliability of the AmericaEconomia ranking, that is whether changes in the ranking positions are not just due to white noise, and compare its stability with those of the US and other global rankings. We also want to empirically determine which are the key quality variables this ranking is promoting for Latin America Business Schools and the evolution of these business schools during the period under study. Unlike previous literature that usually considers dynamic Tobit models for ranking analysis, we put forward an alternative methodology based on a system GMM estimator with first-differenced instruments. We argue that dynamic Tobit models are appropriate only if you have truncated data about the ranking variable but full data on Business Schools variables. This is not always the case, as in our work in which we only have a subsample of Latin American Business Schools, those included in the AmericaEconomia ranking

How Do Business Schools compete in Latin America?Stability and Best Predictors of Success for the AmericaEconomia MBA Ranking

The main aim of this paper is to present a longitudinal analysis of the changes in the AmericaEconomia MBA Rankings for the period 2005-2014. The AmericaEconomia ranking was the first international ranking specifically devoted to Latin American business schools, and with data gathered from this ranking we build a panel to study its stability and the main determinants of a school’s position in such ranking during the period under study. The final aim of this study is to examine the reliability of the AmericaEconomia ranking, that is whether changes in the ranking positions are not just due to white noise, and compare its stability with those of the US and other global rankings. We also want to empirically determine which are the key quality variables this ranking is promoting for Latin America Business Schools and the evolution of these business schools during the period under study. Unlike previous literature that usually considers dynamic Tobit models for ranking analysis, we put forward an alternative methodology based on a system GMM estimator with first-differenced instruments. We argue that dynamic Tobit models are appropriate only if you have truncated data about the ranking variable but full data on Business Schools variables. This is not always the case, as in our work in which we only have a subsample of Latin American Business Schools, those included in the AmericaEconomia ranking

Modelo geométrico para construir la ecuación de segundo grado

En este artículo1 se presentan una serie de reflexiones acerca de un trabajo de investigación en el aula realizado en el Centro Distrital John F. Kennedy. El tema de matemáticas sobre el que se centró la investigación fue la construcción de la expresión algebraica de una ecuación de segundo grado aplicando el concepto de área de un rectángulo. Hemos dividido la presentación del trabajo en dos partes. En la primera, se da cuenta de un diagnóstico en el que se indagó acerca del estado de conocimiento de los estudiantes con respecto al tema y también sobre algunas de sus características socio-económicas. En la segunda, se presenta el análisis curricular realizado alrededor del tema y cuyo propósito era apoyar la realización del diseño de una actividad de aula de noventa minutos. En los procesos anteriores se tuvieron en cuenta algunas pautas de análisis didáctico tales como proponer un modelo sobre la estructura matemática del tema, indagar sobre el conocimiento previo de los estudiantes acerca de los prerrequisitos necesarios para abordar el tema y la forma como usualmente se ha enfocado la enseñanza del tema en nuestro contexto

Mixing and m(q) dependence of axial vector mesons in the Coulomb gauge QCD model.

We discuss pure q (q) over bar axial-vector mesons in the Tamm-Dancoff approximation of the Coulomb-gauge QCD model from North Carolina State University. While recent studies have put emphasis in configuration mixing with open meson-meson channels, we here concentrate on the simpler closed-channel problem and follow the 1(+) mixing through a wide range of quark masses. We also examine their radial excitations and discuss with them the concept of insensitivity to chiral symmetry breaking

Improved simulation of river water and groundwater exchange in an alluvial plain using the SWAT model

Hydrological interaction between surface and subsurface water systems has a significant impact on water quality, ecosystems and biogeochemistry cycling of both systems. Distributed models have been developed to simulate this function, but they require detailed spatial inputs and extensive computation time. The soil and water assessment tool (SWAT) model is a semi-distributed model that has been successfully applied around the world. However, it has not been able to simulate the two-way exchanges between surface water and groundwater. In this study, the SWAT-landscape unit (LU) model – based on a catena method that routes flow across three LUs (the divide, the hillslope and the valley) – was modified and applied in the floodplain of the Garonne River. The modified model was called SWAT-LUD. Darcy's equation was applied to simulate groundwater flow. The algorithm for surface water-level simulation during flooding periods was modified, and the influence of flooding on groundwater levels was added to the model. Chloride was chosen as a conservative tracer to test simulated water exchanges. The simulated water exchange quantity from SWAT-LUD was compared with the output of a two-dimensional distributed model, surface–subsurface water exchange model. The results showed that simulated groundwater levels in the LU adjoining the river matched the observed data very well. Additionally, SWAT-LUD model was able to reflect the actual water exchange between the river and the aquifer. It showed that river water discharge has a significant influence on the surface–groundwater exchanges. The main water flow direction in the river/groundwater interface was from groundwater to river; water that flowed in this direction accounted for 65% of the total exchanged water volume. The water mixing occurs mainly during high hydraulic periods. Flooded water was important for the surface–subsurface water exchange process; it accounted for 69% of total water that flowed from the river to the aquifer. The new module also provides the option of simulating pollution transfer occurring at the river/groundwater interface at the catchment scale

Systematic generation of finite-range atomic basis sets for linear-scaling calculations

Basis sets of atomic orbitals are very efficient for density functional calculations but lack a systematic variational convergence. We present a variational method to optimize numerical atomic orbitals using a single parameter to control their range. The efficiency of the basis generation scheme is tested and compared with other schemes for multiple zeta basis sets. The scheme shows to be comparable in quality to other widely used schemes albeit offering better performance for linear-scaling computations

3D printed monoliths: From powder to an efficient catalyst for antibiotic degradation

To improve the effectiveness and durability of wastewater treatment technologies, researchers are showing a growing interest in 3D printing technology. This technology has attracted significant interest owing to its ability to fabricate challenging complex geometries using different material compositions. This manuscript is focused on the development of 3D monoliths from noncommercial filaments, i.e., a powder blend of iron oxide and polylactic acid (PLA) at 15 wt% of the former. Different monolith designs have been prepared to improve the fluid dynamics of the process, so a simple cylinder (15-Fe3O4@PLA) and a cylinder with double the length and an internal mesh (15-Fe3O4@PLA-DM) were used. These monoliths were characterized by Scanning electron microscopy (SEM), Differential scanning calorimetry (DSC) and Mossbauer ¨ spectroscopy, then used for water-based ofloxacin degradation in a continuous down-up flow configuration. Additionally, computational fluid dynamics simulations were performed to estimate the degradation rate constants and analyze the distribution of fluid velocity and pollutant concentration along the 15-Fe3O4@PLA-reactor. The oxidant dose was also optimized to develop the highest degradation rate. The degradation of the target pollutant for those monoliths was 55 and 82 % under optimized conditions. In addition, the 15-Fe3O4@PLA-DM monolith was operated for long term experiments, keeping the degradation performance at a good 67 % for up to 120 h. Finally a fixed-bed reactor was mounted with printed pellets of the mixture (15:85), Fe3O4:PLA, after being ground in a range of 125–200 μm. Under this setup configuration, we observed the total degradation of ofloxacin. 3D printing technology is cheap, reproducible and time saving in the development of supported catalysts in comparison with conventional deposition techniques. Moreover, the leaching of active sites on streams was largely diminished. In fact under continuous operation the leached Fe concentration is below 0.1 ppm, corroborating the good adhesion of the catalyst in the PLA supportThis research has been supported by the Spanish Ministry of Science and Innovation thorough the project PID2021-123431OB-I0

Recomendaciones para la informatización de los servicios de neonatología

El objetivo es proporcionar el marco para la recopilación de datos en el área de la salud de los recién nacidos que permitan la armonización de la asistencia sea cual sea su lugar de nacimiento. Para ello es necesario conocer la población atendida y la mayor dificultad es la ausencia de un sistema de recopilación de datos y de unos estándares asistenciales para todas las condiciones del recién nacido. Es imprescindible disponer de un registro único en el que se recojan los principales datos perinatales y neonatales de todos los recién nacidos. La Sociedad Española de Neonatología (SEN) debe ser el depositario y responsable de la base de datos, que debe cumplir todas las exigencias legales de privacidad y confidencialidad. A nivel de cada centro es posible conocer el peso relativo de la afección atendida por grupos de diagnósticos relacionados (DRG) y los resultados desde el aspecto de calidad asistencial. Mediante análisis comparativos (estudios de benchmarking,. . .) es posible establecer las pautas de diagnóstico y tratamiento. Es necesario conocer la población de recién nacidos atendida y definir criterios de diagnóstico y tratamiento para mejorar la calidad asistencial. La SEN desea dirigirse a los responsables asistenciales de los centros hospitalarios para pedirles su apoyo y colaboración en la puesta en marcha de estas recomendaciones

Draft Genome Sequences of Anaplasma phagocytophilum, A. marginale, and A. ovis Isolates from Different Hosts

Here, we report the draft genome sequences of isolates of Anaplasma phagocytophilum, Anaplasma marginale, and Anaplasma ovis. The genomes of A. phagocytophilum (human), A. marginale (cattle), and A. ovis (goat) isolates from the United States were sequenced and characterized. This is the first report of an A. ovis genome sequence

Respuesta fisiológica y química de clones de Ulmus minor susceptibles y resistentes a la grafiosis tras la inoculación con Ophiostoma novo-ulmi

Los motivos por los que algunos genotipos de Ulmus minor Mill. resisten más que otros a la infección con el hongo patógeno Ophiostoma novo-ulmi son aun desconocida. Con el objetivo de evaluar si la resis- tencia a la enfermedad de la grafiosis está relacionada con la posesión de ciertos rasgos fisiológicos o quí- micos, se compararon clones de U. minor resistentes y susceptibles a la grafiosis, antes y después de la ino- culación con O. novo-ulmi . Se midieron el potencial hídrico, las tasas de respiración y fotosíntesis foliar, y la conductividad hidráulica de ramas terminales y su composición química mediante espectroscopía de infrarrojo (FT-IR). La inoculación con el hongo produjo un aumento en la proporción de vasos emboliza- dos, de modo que a los 21 días la conductividad hidráulica era solo un 20% de la conductividad máxima en los clones susceptibles. Como consecuencia, el potencial hídrico y la fotosíntesis disminuyeron entor- no a un 100-200% en relación a los controles en los clones susceptibles mientras que no hubo reducciones significativas en los resistentes. Además, los clones mostraron una composición química de sus ramas di- ferente. Por ejemplo, en los árboles inoculados con agua utilizados como control, el pico de absorción en la región del espectro infrarrojo relacionado con la suberina fue más alto en los clones resistentes que en los susceptibles.Estos resultados sugieren que el perfil químico más defensivo de los clones resistentes les permite mantener la funcionalidad fisiológica tras la inoculación con O. novo-ulmi prácticamente inalterada, en comparación con los clones más susceptibles