Factores organizacionales y experienciales del consumidor: Influencia comparativa en el comportamiento de respuesta a la información

Objetivo: Este artículo presenta los resultados de una investigación que vincula factores organizacionales y experienciales de los consumidores mediante un análisis de las relaciones entre la percepción de la responsabilidad social corporativa, la experiencia en el servicio, el valor de marca y la resistencia a la información negativa, en usuarios de los principales servicios bancarios en Colombia y México. Método: Los datos se recabaron entre personas mayores de edad residentes en los dos países, con la técnica de encuesta virtual, se analizaron mediante el modelo de ecuaciones estructurales para comprobar las relaciones directas entre las variables, y bajo el procedimiento de permutaciones para las relaciones de moderación. Resultados: Los hallazgos destacan que la percepción de los consumidores respecto a las iniciativas de responsabilidad que desarrollan los bancos mantiene una relación directa con el valor de marca y la resistencia a la información negativa. Conclusión: Se puede inferir que son los factores organizacionales sobre los elementos experienciales del consumidor, los que prevalecen en el momento de quedar expuestos a comentarios negativos que se realicen acerca de la entidad financiera de la que son usuarios, con resultados diferentes explicados por el efecto moderador del país de origen y el género

Integración de visualización científica molecular en el salón de clases

For some years, Chemistry teachers have used scientific visualization software of molecular models in computing rooms and chemistry laboratories for educational purposes. However, its application in classrooms has been limited. This article describes the integration and use of computer programs for scientific molecular visualization in a traditional classroom. We consider that the improvement of technical aspects of their application and use (usability) has a direct effect on students' understanding of molecular structures (including students' extrinsic motivation), among other factors. Consequently, we developed a guide for the integration of hardware and software of molecular visualization for its use in the classroom

The Physics of Star Cluster Formation and Evolution

© 2020 Springer-Verlag. The final publication is available at Springer via https://doi.org/10.1007/s11214-020-00689-4.Star clusters form in dense, hierarchically collapsing gas clouds. Bulk kinetic energy is transformed to turbulence with stars forming from cores fed by filaments. In the most compact regions, stellar feedback is least effective in removing the gas and stars may form very efficiently. These are also the regions where, in high-mass clusters, ejecta from some kind of high-mass stars are effectively captured during the formation phase of some of the low mass stars and effectively channeled into the latter to form multiple populations. Star formation epochs in star clusters are generally set by gas flows that determine the abundance of gas in the cluster. We argue that there is likely only one star formation epoch after which clusters remain essentially clear of gas by cluster winds. Collisional dynamics is important in this phase leading to core collapse, expansion and eventual dispersion of every cluster. We review recent developments in the field with a focus on theoretical work.Peer reviewe

Erratum to: 36th International Symposium on Intensive Care and Emergency Medicine

[This corrects the article DOI: 10.1186/s13054-016-1208-6.]

Diseño Molecular Asistido por Computadora: Aplicación al Diseño de Cúmulos Mixtos de Silicio-Germanio Diseño Molecular Asistido por Computadora: Aplicación al Diseño de Cúmulos Mixtos de Silicio-Germanio

In this work, electronic structure calculations have been performed to obtain the minimum potential energy structures of pure and mixed silicon-germanium clusters (cluster size within 2-6 atoms). Furthermore the electronic structure and various physical and chemical properties are studied. Properties useful for electronics applications, like heat of formation, ionization potentials, electron affinity, absolute hardness, electronegativity, hybridization, vibrational frequencies, fragmentation and bond dissociation energy of these silicon-germanium clusters are discussed. Thereafter, the evolution of the mixed clusters geometries with increasing germanium composition is also discussed. The most stable mixed silicon-germanium clusters are predicted for four and six atoms components and some with nuclearity equal to five such as SiGe4, Si2Ge3, and Si3Ge2.En este trabajo se presentan cálculos de estructura electrónica para obtener las estructuras de mínima energía potencial en cúmulos puros y mixtos de Silicio y Germanio, para tamaño de cúmulos entre 2 y 6 átomos. Además de analizar la estructura electrónica, estudiamos una serie de propiedades físicas y químicas de estos sistemas, de interés para su posible aplicación en Electrónica, entre ellas el calor de formación, potencial de ionización, afinidad electrónica, dureza absoluta, electronegatividad, hibridación, frecuencias vibracionales, estabilidad frente a la fragmentación y energía de disociación de enlace. También se presenta una discusión sobre la evolución de las geometrías de los cúmulos mixtos según aumenta la composición de Germanio en cada cúmulo. Se puede predecir cuales de estos cúmulos, que aún no se detectan experimentalmente, serían los más estables, y aparentemente son aquéllos con 4, o 6 átomos y algunos de nuclearidad igual a 5, como son los cúmulos SiGe4, Si2Ge3, and Si3Ge2.</p

How Sn(IV) Influences on the Reaction Mechanism of 11, <i>tri</i>-Butyl <i>p</i>-Coumarate and Its <i>tri</i>-Butyl-tin <i>p</i>-Coumarate Considering the Solvent Effect: A DFT Level Study

Antioxidants are molecules that neutralize free radicals. In general, the reaction mechanisms of antioxidants are well known. The main reaction mechanisms of antioxidants are electron transfer (ET), hydrogen transfer (HT), and radical adduction formation (RAF). The study of these mechanisms is helpful in understanding how antioxidants control high free radical levels in the cell. There are many studies focused on determining the main mechanism of an antioxidant to neutralize a wide spectrum of radicals, mainly reactive oxygen species (ROS)-type radicals. Most of these antioxidants are polyphenol-type compounds. Some esters, amides, and metal antioxidants have shown antioxidant activity, but there are few experimental and theoretical studies about the antioxidant reaction mechanism of these compounds. In this work, we show the reaction mechanism proposed for two esters, 11, tri-butyl p-coumarate and its tri-butyl-tin p-coumarate counterpart, using Sn(IV). We show how Sn(IV) increases the electron transfer in polar media and the H transfer in non-polar media. Even though the nature of esters could be polar or non-polar compounds, the antioxidant activity is good for the Sn(IV)-p-coumarate complex in non-polar media

Estudio de usabilidad de visualización molecular educativa en un teléfono inteligente

Chemistry students have difficulty understanding molecular structures and their functions. To aide their comprehension, molecular visualization software has been developed to run on smart phones, but in order to positively influence learning it must have a high degree of usability (usability measures how software is used in terms of efficiency, efficacy and satisfaction). This paper describes a usability study of molecular visualization software running on a smart phone, where chemistry students analyzed molecular models. Results showed very good usability and 95% of students wanted to use it in further classes