Ethical implications of onto-epistemological pluralism in relation to entropy,

From the epistemological posture that we present in this work we sustain the following thesis:-That as subjects we constitute the world we live in through one of the possible conceptual frameworks.-Our cognitive and social practices construct the world in a certain manner, which makes us responsible for the way this world is constituted

Narco Violence in Mexico: A Spatial Analysis of Drug-Related Bloodshed

Latin American Studie

An exotic k-essence interpretation of interactive cosmological models

We define a generalization of scalar fields with non-canonical kinetic term which we call exotic k-essence or briefly, exotik. These fields are generated by the global description of cosmological models with two interactive fluids in the dark sector and under certain conditions, they correspond to usual k-essences. The formalism is applied to the cases of constant potential and of inverse square potential and also we develop the purely exotik version for the modified holographic Ricci type of dark energy (MHR), where the equations of state are not constant. With the kinetic function $F=1+mx$ and the inverse square potential we recover, through the interaction term, the identification between k-essences and quintessences of exponential potential, already known for Friedmann-Robertson-Walker and Bianchi type I geometries. Worked examples are shown that include the self-interacting MHR and also models with crossing of the phantom divide line (PDL).Comment: Revised version to be published in European Physical Journal

Qualidade de vida profissional e a disposição à mudança organizacional em funcionários de empresas da cidade de Bogotá - Colômbia

O propósito desta pesquisa foi determinar a relação entre a qualidade de vida profissional e a disposição à mudança organizacional numa amostra de 100 funcionários de empresas da cidade de Bogotá. Realizou-se sob um desenho transversal correlacional por meio da aplicação de dois instrumentos: o instrumento de medição de mudança organizacional (García e Forero, 2010) e o de qualidade de vida percebida em organizações (Gómez-Rada, 2011). A participação da população foi voluntária. A análise dos dados foi realizada por meio do rho de Spearman. Os resultados obtidos mostram uma correlação significativa a 0.001 com todas as variáveis de mudança organizacional e de qualidade de vida, exceto as de resistência à mudança. Esses achados sugerem que alguns dos aspectos a ressaltar são a importância da qualidade de vida e do compromisso com as tarefas a realizar visto que estes definem as metas e os objetivos propostos pela entidade e determinam o trabalho e a produtividade dos empregados, assim como sua disposição à mudança.The purpose of the research was to determine the relationship between quality of work life and readiness to organizational change in a sample of 100 company workers in the city of Bogota. It was conducted following a correlational cross-sectional design through the application of two instruments: one that measures organizational change (BMI) (García & Forero, 2010) and another one that assesses perceived quality of life in organizations (Gómez - Rada, 2011). The sample participation was voluntary and data were analyzed using Spearman’s Rho. Results show a significant correlation at 0.001 in all the variables of organizational change and quality of life with the exception of resistance to change. This suggests that some of the aspects to be highlighted are the importance of quality of life and commitment to the tasks to be performed as these define the goals and objectives set by the entity and frame the work and productivity of employees as well as their readiness to change. Key words: organizational change, quality of work life.El propósito de la investigación fue determinar la relación entre la calidad de vida laboral y la disposición al cambio organizacional en una muestra de 100 funcionarios de empresas de la ciudad de Bogotá. Se realizó bajo un diseño transversal correlacional, a través de la aplicación de dos instrumentos: el instrumento de medición de cambio organizacional (IMC) (García & Forero, 2010) y el de calidad de vida percibida en organizaciones (Gómez – Rada, 2011). La participación de la población fue voluntaria. El análisis de los datos se realizó por medio del Rho de Spearman. Los resultados obtenidos muestran una correlación significativa al 0.001 con todas las variables de cambio organizacional y de calidad de vida, excepto las de resistencia al cambio. Estos hallazgos sugieren que algunos de los aspectos a resaltar son la importancia de la calidad de vida y el compromiso con las tareas a realizar, ya que estos definen las metas y objetivos planteados por la entidad y enmarcan el trabajo y la productividad de los empleados, al igual que su disposición al cambio

Of the use of the “English sector” in trigonometry: what amount of mathematical training was necessary in the 18th century?

In 1723 Edmund Stone published The construction and principal uses of mathematical instruments, which was essentially a translation from the French of Bion’s Traité de la construction et des principaux usages des instrumens de mathématique (1709). As the title of the book indicated, Stone annexed a number of instruments that had been omitted by Bion, in particular, those invented or improved by the English. Hence, after the translation of Book II, on the construction and uses of the “French sector”, Stone added a chapter on the “English sector”. In the 17th century there had been a number of debates concerning the amount of mathematical training required for the study of mathematical instruments. In the context of the study of mathematical instruments in the 18th century, it is worth exploring the link theory-practice in the books on instruments. The aim of this contribution is to explore the mathematical knowledge involved in the use and applications of the “English sector” in trigonometry in a number of 18th-century books on mathematical instruments.Peer ReviewedPostprint (published version

Caracterización fundamental de superficies metálicas a condiciones relevantes para la catálisis

Heterogeneous catalysis involves chemisorption, reactions of chemisorbed species, and desorption of the products formed. The enthalpies and entropies for these elementary steps and their transition states provide the thermodynamic context that allows rigorous interpretations of the rates and selectivities of chemical reactions mediated by surfaces. The measurement of rates and/or thermodynamic properties at conditions relevant for catalysts and in the absence of mass and heat transport limitations are required for the proper reactor and catalyst design. Different challenging examples are provided, in which chemical rates and/or thermodynamic properties are measured under rigorous kinetic or thermodynamic conditions, giving information regarding the nature of the active metal surfaces and their role at reaction conditions. Among the cases to be presented are the alkane oxidation reactions on noble metals, Pd-PdO phase transition and its consequences for catalysis, and the surface characterization of metals by H2 chemisorption at elevated temperatures. Alkane-O2 (CH4 and C2H6) reactions are highly exothermic and tend to occur within the length scale of conductive or convective heat and mass transfer, which lead to severe gradients within undiluted catalyst pellets and reactors. Extensive dilution within the pellets and reactor has been used to get kinetic and isotopic data for Alkane-O2 reactions on supported Pt, Rh and Pd. These data have shown that CO and H2 do not form via direct alkane partial oxidation but instead via sequential combustion-reforming pathways. Alkane-O2 reactants form CO2 and H2O on Pt in three kinetic regimes (KR), each with distinct rate equations, kinetically-relevant steps, most abundant surface intermediates (MASI), and cluster size effects. Transitions among these regimes are determined by the prevalent steady-state coverages of chemisorbed oxygen (O*), which are given by O2 pressure when O2 dissociation is equilibrated and by O2 to Alkane ratios when it is irreversible. Mechanistic interpretations remain valid for other metals such as Pd, and the difference in reactivity among metals is correlated to O* binding strengths when O* is involved in the kinetically-relevant steps. On Pd and Rh, however, the clusters undergo phase transition to PdO and RhO2, leading to an additional kinetic regime characterized by an abrupt increase in reactivity caused by the transition from metal to oxide. Ex-situ O2 uptake measurements, at equilibrium, were performed to correlate the oxygen content during the phase transition with the measured rates at reaction conditions. Another example is given by the use of dissociative H2 chemisorption methods at conditions relevant for catalysis as a thermodynamic probe instead of mere site counting technique, in which differential enthalpies and entropies of adsorption are obtain to probe the non-uniformity of cluster surfaces. H-atoms formed via H2 dissociation are attractive titrants because of the reversible nature of the adsorption processes and the well-defined adsorption stoichiometry, but also because of the ubiquitous involvement of H-atoms in hydrogenation-dehydrogenation catalysis.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech

El Mètode de Newton-Raphson... i Simpson: una aplicació d'eines de programació per a analitzar textos matemàtics històrics

The Newton-Raphson method is a well-known numerical method for finding approximations to the real roots of a real-valued function. It is named after Isaac Newton (1643-1727) and Joseph Raphson (1668-1715), who, towards the end of the 17th century, elaborated their methods for finding the approximate roots of polynomial equations. However, from the original sources, it is clear that both methods differ not only from each other, but also from the algorithm used at present.Postprint (published version