The role of microstructure in fatigue crack initiation and propagation in 9-12Cr ferritic-martensitic steels

The present paper presents low-cycle fatigue results about cyclic behaviour, the evolution of the dislocation structure and the nucleation and propagation of microstructural cracks in commercial ferritic-martensitic steel AISI 410.Fil: Batista, Maria Natalia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Instituto de Física de Rosario. Universidad Nacional de Rosario. Instituto de Física de Rosario; ArgentinaFil: Hereñu, Silvina Andrea Noemi. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Instituto de Física de Rosario. Universidad Nacional de Rosario. Instituto de Física de Rosario; ArgentinaFil: Alvarez, Iris. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Instituto de Física de Rosario. Universidad Nacional de Rosario. Instituto de Física de Rosario; Argentin

Hidden Markov Models for Gene Sequence Classification: Classifying the VSG genes in the Trypanosoma brucei Genome

The article presents an application of Hidden Markov Models (HMMs) for pattern recognition on genome sequences. We apply HMM for identifying genes encoding the Variant Surface Glycoprotein (VSG) in the genomes of Trypanosoma brucei (T. brucei) and other African trypanosomes. These are parasitic protozoa causative agents of sleeping sickness and several diseases in domestic and wild animals. These parasites have a peculiar strategy to evade the host's immune system that consists in periodically changing their predominant cellular surface protein (VSG). The motivation for using patterns recognition methods to identify these genes, instead of traditional homology based ones, is that the levels of sequence identity (amino acid and DNA sequence) amongst these genes is often below of what is considered reliable in these methods. Among pattern recognition approaches, HMM are particularly suitable to tackle this problem because they can handle more naturally the determination of gene edges. We evaluate the performance of the model using different number of states in the Markov model, as well as several performance metrics. The model is applied using public genomic data. Our empirical results show that the VSG genes on T. brucei can be safely identified (high sensitivity and low rate of false positives) using HMM.Comment: Accepted article in July, 2015 in Pattern Analysis and Applications, Springer. The article contains 23 pages, 4 figures, 8 tables and 51 reference

An Unhealthy Click: An Investigation Of Pro-Eating Disorder Website Visitation In A Community Sample

Objective: This study compared pro-eating disorder website visitors and non-visitors on demographic characteristics, weight and diet related variables, eating disorder psychopathology, overvaluation of thinness and attitudes towards these sites. A new measure, the Thin Commandments Scale (TCS), was developed and preliminarily validated. Methods: The study employed a community sample of 420 adults who completed a battery of questionnaires, which also included the Eating Disorder Examination Questionnaire (EDE-Q), the Sociocultural Attitudes Toward Appearance Questionnaire (SATAQ-3)-Internalization Subscale, and the Beck Depression Inventory (BDI). Additionally, participants responded questions regarding the harmfulness and acceptability of these sites, as well as regarding visitors\u27 health. Results: Visitors and non-visitors did not differ on demographic or weight and diet related variables except for age and BMI. Visitors exhibited greater eating disorder psychopathology and overvaluation of thinness than non-visitors. Visitors were less likely to judge these websites as harmful and unacceptable, but both groups reported a negative evaluation of the sites. Factor analysis for the Thin Commandments Scale revealed the presence of a single factor, internal consistency analysis showed excellent reliability and support was found for the concurrent validity of the scale. Conclusions: These findings provide further insight into the characteristics of pro-eating disorder website visitors and confirm previous studies that showed that visitors might not conform to the stereotype of the eating disorder population. The Thin Commandments Scale showed initial promise as a way to identify people at risk for developing eating disorders, but replication with other populations is needed to confirm these findings

Identificaction and geographhic distribution of major producer of Moringa oleifera in Tolima

Dada la importancia y los beneficios de la planta multipropósito Moringa oleífera y su empleo en el departamento del Tolima y el país, así como la ausencia de un sistema de gestión de información, en el presente documento se presenta un Sistema de Información Geográfica de esta planta en el departamento, por medio de la identificación de los principales productores y cultivos así como su distribución geográfica con el fin de promover su posición dentro de la cadena productiva.Due to the importance and benefits of multipurpose plant Moringa oleifera and its use in the region of Tolima and the country as well as the absence of a management information system, this document provides a Geographic Information System of this plant in the department , through the identification of major producers and farming as well as their geographic distribution in order to promote their position in the production chain

Evaluar el efecto de la implementación de la señalización vial en cinco zonas escolares de Bogotá

La reducción de la velocidad es uno de los factores a tener en cuenta para la disminución e impacto de la accidentalidad. Este estudio involucra la medición del efecto que genera la implementación de la señalización en cinco zonas escolares de Bogotá. Para esto se realizó un estudio descriptivo de la accidentalidad en las zonas para el período comprendido entre los años 2007 y 2013. Se realizaron mediciones de velocidad antes y después de la implementación de la señalización, como uno de los factores más influyentes al analizar las causas de accidentalidad. Finalmente se realizó un estudio observacional del comportamiento por parte de conductores y peatones frente a los dispositivos de señalización instalados en la zona escolar. Se encontró, que la implementación de la señalización donde se incluyen bandas de estoperoles no cumplen con la función para los cuales están diseñados y por lo tanto deben evaluarse otras alternativas que si generen un efecto reductor por parte de los vehículos y así mismo se genere una reducción de los accidentes de tránsito."The speed reduction is one of the factors to consider for the reduction and impact of the accident. This study involves the measurement of the effect generated by the implementation of the five schools signaling in areas of Bogota. For this descriptive study was conducted in the accident areas for the period between 2007 and 2013. Velocity measurements were performed before and after implementation of signaling, as one of the most influential factors when analyzing the causes accident. Finally an observational study of behavior was performed by drivers and pedestrians against signaling devices installed in the school zone. It was found that the implementation of signaling where ""bands studded"" includes not fulfill the function for which they are designed and therefore other alternatives if generate a reducing effect by the vehicles should be evaluated and likewise are generate a reduction in traffic accidents. "Ingeniero (a) CivilPregrad

A GPU-enabled implicit Finite Volume solver for the ideal two-fluid plasma model on unstructured grids

This paper describes the main features of a pioneering unsteady solver for simulating ideal two-fluid plasmas on unstructured grids, taking profit of GPGPU (General-purpose computing on graphics processing units). The code, which has been implemented within the open source COOLFluiD platform, is implicit, second-order in time and space, relying upon a Finite Volume method for the spatial discretization and a three-point backward Euler for the time integration. In particular, the convective fluxes are computed by a multi-fluid version of the AUSM+up scheme for the plasma equations, in combination with a modified Rusanov scheme with tunable dissipation for the Maxwell equations. Source terms are integrated with a one-point rule, using the cell-centered value. Some critical aspects of the porting to GPU's are discussed, as well as the performance of two open source linear system solvers (i.e. PETSc, PARALUTION). The code design allows for computing both flux and source terms on the GPU along with their Jacobian, giving a noticeable decrease in the computational time in comparison with the original CPU-based solver. The code has been tested in a wide range of mesh sizes and in three different systems, each one with a different GPU. The increased performance (up to 14x) is demonstrated in two representative 2D benchmarks: propagation of circularly polarized waves and the more challenging Geospace Environmental Modeling (GEM) magnetic reconnection challenge.Comment: 22 pages, 7 figure

Enantiomeric Ratio Changes of Terpenes in Essential Oils from Hybrid Eucalyptus grandis × E. tereticornis and its Pure Species

Some Eucalyptus species produce oils with biological activities and the effect of their interspecifc hybridization on the enantiomeric composition of terpenes has not been reported. The enantiomeric excesses of monoterpenes in the essential oil of Eucalyptus grandis × E. tereticornis and its parental taxa were determined by gas chromatography-mass spectrometry (GC-MS), and to resolve coelutions problems by preparative high performance liquid chromatography (HPLC)and GC-MS with two columns in series. The essential oil composition of the hybrid presented qualitative and quantitative differences with the composition of its parental taxa. Great differences were found for the enantiomeric ratio in monoterpene alcohols among the three essential oils. Our results suggest that the enantiomeric analysis can be a reliable method for the study of how theinterspecifc hybridization can module the enantiomeric chemical profle in Eucalyptus essential oils. These results suggest the use of interspecifc hybridization to improve or expand the source of bioactive compounds.Fil: Naspi, Cecilia Veronica. Consejo Nacional de Investigaciones Científicas y Técnicas. Unidad de Investigación y Desarrollo Estratégico para la Defensa. Ministerio de Defensa. Unidad de Investigación y Desarrollo Estratégico para la Defensa; ArgentinaFil: Alvarez Costa, Agustin. Consejo Nacional de Investigaciones Científicas y Técnicas. Unidad de Investigación y Desarrollo Estratégico para la Defensa. Ministerio de Defensa. Unidad de Investigación y Desarrollo Estratégico para la Defensa; ArgentinaFil: Lucia, Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Unidad de Investigación y Desarrollo Estratégico para la Defensa. Ministerio de Defensa. Unidad de Investigación y Desarrollo Estratégico para la Defensa; ArgentinaFil: Gonzalez Audino, Paola Andrea. Consejo Nacional de Investigaciones Científicas y Técnicas. Unidad de Investigación y Desarrollo Estratégico para la Defensa. Ministerio de Defensa. Unidad de Investigación y Desarrollo Estratégico para la Defensa; ArgentinaFil: Masuh, Hector Mario. Consejo Nacional de Investigaciones Científicas y Técnicas. Unidad de Investigación y Desarrollo Estratégico para la Defensa. Ministerio de Defensa. Unidad de Investigación y Desarrollo Estratégico para la Defensa; Argentin

Relación entre dislipidemia y periodontitis crónica en adultos entre 18 y 78 años, atendidos en clínica odontológica de la Universidad Andrés Bello, sede Santiago, entre abril y septiembre del año 2017

Tesis (Cirujano Dentista)Objetivo: El objetivo de este estudio fue determinar la relación entre dislipidemia y periodontitis crónica de acuerdo a la severidad en pacientes adultos atendidos en la Clínica Odontológica de la Universidad Andrés Bello. Materiales y métodos: El grupo de estudio incluyó 53 pacientes adultos entre 18 y 78 años, seleccionados de forma no probabilística por conveniencia, atendidos en la Clínica Odontológica de la Universidad Andrés Bello, sede Santiago, entre abril y septiembre del año 2017. La muestra incluyó pacientes diagnosticados con dislipidemia y periodontitis crónica, los que fueron evaluados recolectando los siguientes antecedentes a través de un cuestionario: edad, género, enfermedades que padece, tratamientos farmacológicos, valores de perfil lipídico (HDL, LDL, triglicéridos, colesterol total) y tratamiento para la dislipidemia. Y a través del periodontograma inicial se recopilaron datos sobre el sangrado, posición de encía, profundidad del surco y el nivel de inserción clínica (NIC). Resultados: Existe asociación estadística entre el género del paciente y la severidad, un 89.5% de los hombres presenta una periodontitis crónica severa, mientras que en las mujeres es de 67.6%. No se observó asociación estadística entre grupos de edad y severidad. No existe relación entre los pacientes con tratamiento farmacológico y características clínicas de la enfermedad periodontal. Existe una asociación estadística negativa entre HDL y nivel de inserción clínica. También existe una asociación positiva entre triglicéridos y nivel de inserción clínica. Conclusiones: La severidad de la periodontitis crónica no tiene relación con la edad del paciente dislipidémico, pero sí, respecto a su género.Objective: The aim of the study was to determine the relation between dyslipidemia and the severity of chronic periodontitis in adult subjects treated in the Universidad andres bello’s dental clinic. Material and methods: A total of fifty three adult subjects aged 18 to 78, selected in a convenience non-probabilistic way treated in the Universidad Andrés Bello’s dental clinic, Santiago, during the months of April to September of year 2017. This population included subjets diagnosed with dyslipidemia and chronic periodontitis collecting the following data: age, gender, chronic diseases, pharmacologic treatment, values of lipid profile test (Total cholesterol, High-density lipoprotein cholesterol (HDL), Low-density lipoprotein cholesterol (LDL) and Triglycerides) and treatment option for dyslipidemia. Through the initial periodontogram was collecting data about the bleeding on probing, probing depth, gingival margin and clinical attachment level. Results: Statistically significant associations were observed between gender of the subject and severity, a 89.5% of the men presented chronic periondontitis while 67.6% of the female subjects presented chronic periodontitis. No significant associations were observed on subjects on pharmacologic treatment and the clinical characteristics of chronic periodontitis. There is a statistical negative association between HDL and clinical attachment level. There is also a positive association between triglyerides and clinical attachment level. Conclusion: The severity of the chronic peridontitis has no relation with dyslipidemic patients age, but it is related to the patients gender

Hochschild homology and cohomology of Generalized Weyl algebras: the quantum case

We determine the Hochschild homology and cohomology of the generalized Weyl algebras of rank one which are of 'quantum' type in all but a few exceptional cases.Comment: 27 page