Energy Consumption Analysis Of Machining Centers Using Bayesian Analysis And Genetic Optimization

Responding to the current urgent need for low carbon emissions and high efficiency in manufacturing processes, the relationships between three different machining factors (depth of cut, feed rate, and spindle rate) on power consumption and surface finish (roughness) were analysed by applying a Bayesian seemingly unrelated regressions (SUR) model. For the analysis, an optimization criterion was established and minimized by using an optimization algorithm that combines evolutionary algorithm methods with a derivative-based (quasi-Newton) method to find the optimal conditions for energy consumption that obtains a good surface finish quality. A Bayesian ANOVA was also performed to identify the most important factors in terms of variance explanation of the observed outcomes. The data were obtained from a factorial experimental design performed in two computerized numerical control (CNC) vertical machining centers (Haas UMC-750 and Leadwell V-40iT). Some results from this study show that the feed rate is the most influential factor in power consumption, and the depth of cut is the factor with the stronger influence on roughness values. An optimal operational point is found for the three factors with a predictive error of less than 0.01% and 0.03% for the Leadwell V-40iT machine and the Haas UMC-750 machine, respectively

Prevalence of SARS-CoV-2 Infection at the University of Barcelona during the Third COVID-19 Pandemic Wave in Spain

The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) pandemic started in December 2019 and still is a major global health challenge. Lockdown measures and social distancing sparked a global shift towards online learning, which deeply impacted universities' daily life, and the University of Barcelona (UB) was not an exception. Accordingly, we aimed to determine the impact of the SARS-CoV-2 pandemic at the UB. To that end, we performed a cross-sectional study on a sample of 2784 UB members (n = 52,529). Participants answered a brief, ad hoc, online epidemiological questionnaire and provided a nasal swab for reverse transcription polymerase chain reaction (RT-PCR) SARS-CoV-2 analysis and a venous blood sample for SARS-CoV-2 IgG antibody assay. Total prevalence of SARS-CoV-2 infection (positive RT-PCR or positive IgG) was 14.9% (95%CI 13.3 to 17.0%). Forty-four participants (1.6%, 95%CI: 1.2-2.1%) were positive for SARS-CoV-2 RT-PCR. IgG against SARS-CoV-2 was observed in 12.8% (95%CI: 11.6-14.1%) of participants. Overall, while waiting for population vaccination and/or increased herd immunity, we should concentrate on identifying and isolating new cases and their contact

Un mapeo sistemático de literatura: pruebas basadas en riesgo en el desarrollo de software

Risk-based testing (RBT) is a type of test that helps identify product risks from the start of development, incorporating techniques that allow them to be identified and classified according to their impact and probability to create test cases for those selected requirements. However, in software development organizations the identified risks are related to the planning or cost of the project to guarantee product delivery and do not consider other risks as input for the creation of test cases and quality evaluation. of the product. Therefore, the objective of systematic mapping is based on identifying and determining the state of the art of publications related to RBT used in the software industry, in addition to metrics that incorporate or evaluate the performance of these types of tests and their benefits. The results show the proposals found on the software industry RBT and the importance of use as other types of software testing. Also, we present a preview of the Framework to support the RBT in global software development.Las pruebas basadas en riesgos (PBR) son un tipo de prueba que ayuda a identificar los riesgos del producto desde el inicio de desarrollo, incorporando técnicas que permitan su identificación y ser clasificados según su impacto y probabilidad, de modo que permitan crear casos de prueba para aquellos requerimientos seleccionados. Sin embargo, en las organizaciones de desarrollo software los riesgos que se identifican tienen relación con la planificación o coste del proyecto para garantizar la entrega del producto y no consideran otros riesgos como elementos de entrada para la creación de casos de prueba y evaluación de la calidad del producto. Por lo tanto, el objetivo del mapeo sistemático se basa en identificar y determinar el estado del arte de las publicaciones relacionas con PBR utilizadas en la industria software, además de métricas que incorporen o evalúen el desempeño de este tipo de pruebas y sus beneficios. Los resultados obtenidos demuestran las propuestas encontradas sobre las PBR en la industria software y la importancia de uso como otro tipo de pruebas software. Así mismo, presentamos una vista previa de Framework para soportar las PBR en el desarrollo de software global

Convivencia barrial con pacientes psiquiátricos y sus efectos en las actitudes de la comunidad: estudio en la Provincia de Buenos Aires, Argentina. 2012-2013

Objetivo: Analizar las transformaciones producidas en las actitudes de la comunidad de vecinos al tener entre sus miembros a pacientes psiquiátricos. Metodología: estudio observacional analítico en el que se compararon zonas de vecinos de casas de convivencia en las que habitan pacientes psiquiátricos atendidos ambulatoriamente y zonas equivalentes pero sin casas de convivencia. Se elaboró y aplicó un cuestionario a 236 personas (grupo de estudio n = 117; grupo control n = 119), que indagaba por características del barrio, actitudes frente a poblaciones específicas e ideas frente a la enfermedad mental y su tratamiento. También se analizó una sub-muestra de vecinos (n = 9) con otro cuestionario que exploraba por la convivencia barrial con los pacientes psiquiátricos y sus efectos. El análisis de los datos fue cuantitativo (SPSS 18.0) y cualitativo. Resultados: se destaca la asociación estadísticamente significativa entre ser vecino y el grado de aceptación hacia personas con “enfermedad mental”, y entre el grado de cohesión social y la aceptación de la “enfermedad mental”. Conclusiones: la convivencia barrial con pacientes psiquiátricos tendría efectos en las actitudes de los vecinos, las cuales podrían ser vistas como una dimensión de su salud mental, entendida ésta en términos psicosociales

Biodiversidad de la sierra de La Macarena, Meta, Colombia. Parte I. Ríos Guayabero medio, bajo Losada y bajo Duda

Resultados parciales de los Convenios de Cooperación suscritos entre el Instituto de Investigación de Recursos Biológicos Alexander von Humboldt y la Corporación para el Desarrollo Sostenible del Área de Manejo Especial de La Macarena-Cormacarena (N° 18-096 y 17-194 Instituto Humboldt) y PE.GDE. 1.4.8.1.18.014 del 2018 y PE.GDE. 1.4.7.17.030 del 2017 Cormacarena), correspondientes a la “Evaluación de la biodiversidad acuática del río Guayabero, sierra de La Macarena, Meta. Fases I y II”

Recolección de tejidos biológicos para análisis genéticos

La información genética es una fuente de conocimiento fundamental para la gestión integral de la biodiversidad. Sin embargo, la baja disponibilidad de tejidos biológicos bien recolectados y preservados limita la integración de esta información en la toma de decisiones ambientales en países megadiversos, como Colombia. Aquí se presentan infográficamente las mejores prácticas de recolección de tejidos para una gran variedad de grupos biológicos, ofreciendo alternativas de muestreo que son prácticas bajo diferentes contextos. Cada capítulo es de la autoría de investigadores con experiencia en la recolección de tejidos en sus grupos de estudio y fue revisado científicamente por al menos dos evaluadores externos. Esta publicación ofrece la instrucción necesaria para recolectar muestras ambientales y de tejidos de plantas, macroalgas, hongos, corales, esponjas, zooplancton, macroinvertebrados acuáticos, crustáceos, moluscos, insectos, peces cartilaginosos, mamíferos acuáticos, peces óseos, anfibios, reptiles, aves y mamíferos terrestres siguiendo buenas prácticas de marcado, recolección y preservación. En la mayoría de estos grupos se presentan alternativas de muestreo no invasivo a partir de especímenes vivos y muestreo a partir de especímenes recién recolectados o depositados en colecciones biológicas, sin comprometer su integridad. Este trabajo hace parte de los alcances del programa Colombia BIO y constituye una síntesis de procedimientos útiles en campo y colecciones biológicas que busca incrementar la cantidad y calidad de las colecciones de tejidos y así fomentar la generación de información genética.Bogotá, D. C

Modeling the Impact of the Type of Cutting and Storage Temperature on the Bioactive Compound Content, Phenylpropanoid Metabolism Enzymes and Quality Attributes of Fresh-Cut Strawberries

The aim of this work was to model the effect of the type of cutting (whole without hull, halved, and quartered), storage temperature (2, 6, and 13 °C) and time on the changes of bioactive compounds, phenylpropanoid metabolism enzyme activities, and quality attributes of fresh-cut strawberries. The effect of increasing the intensity of wounding revealed an activation of the phenylalanine ammonia lyase (PAL) enzyme, with the consequent synthesis of phenolic compounds. Results revealed that quartered strawberries stored at 2 °C for 15 days accumulated up to 22% more phenolics than whole strawberries. The changes on quality parameters (soluble solids, pH, and color), total anthocyanins, and polyphenol oxidase were adequately fitted with zero order kinetic. All rate constants of these attributes, except for anthocyanins, fitted appropriately with Arrhenius equation. Changes on total phenolic contents and on PAL activity were fitted with a consecutive reaction mechanistic kinetic model. The rate constants of phenolics kinetic showed no dependence with temperature. However, rate constants of PAL activity fitted appropriately with Arrhenius equation. This global study offers a better understanding of the effects of processing and storage conditions on general quality, bioactive compounds, and phenylpropanoid metabolism enzymes of fresh-cut strawberries.Fil: Van de Velde, Franco. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional del Litoral. Facultad de Ingeniería Química; ArgentinaFil: Fenoglio, Cecilia Lorena. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional del Litoral. Facultad de Ingeniería Química; ArgentinaFil: Piagentini, Andrea. Universidad Nacional del Litoral. Facultad de Ingeniería Química; ArgentinaFil: Pirovani, Maria Elida. Universidad Nacional del Litoral. Facultad de Ingeniería Química; Argentin

Mild Developmental Foreign Accent Syndrome and Psychiatric Comorbidity: Altered White Matter Integrity in Speech and Emotion Regulation Networks

Foreign accent syndrome (FAS) is a speech disorder that is defined by the emergence of a peculiar manner of articulation and intonation which is perceived as foreign. In most cases of acquired FAS (AFAS) the new accent is secondary to small focal lesions involving components of the bilaterally distributed neural network for speech production. In the past few years FAS has also been described in different psychiatric conditions (conversion disorder, bipolar disorder, and schizophrenia) as well as in developmental disorders (specific language impairment, apraxia of speech). In the present study, two adult males, one with atypical phonetic production and the other one with cluttering, reported having developmental FAS (DFAS) since their adolescence. Perceptual analysis by naive judges could not confirm the presence of foreign accent, possibly due to the mildness of the speech disorder. However, detailed linguistic analysis provided evidence of prosodic and segmental errors previously reported in AFAS cases. Cognitive testing showed reduced communication in activities of daily living and mild deficits related to psychiatric disorders. Psychiatric evaluation revealed long-lasting internalizing disorders (neuroticism, anxiety, obsessive -compulsive disorder, social phobia, depression, alexithymia, hopelessness, and apathy) in both subjects. Diffusion tensor imaging (DTI) data from each subject with DFAS were compared with data from a group of 21 age- and gender -matched healthy control subjects. Diffusion parameters (MD, AD, and RD) in predefined regions of interest showed changes of white matter microstructure in regions previously related with AFAS and psychiatric disorders. In conclusion, the present findings militate against the possibility that these two subjects have FAS of psychogenic origin. Rather, our findings provide evidence that mild DFAS occurring in the context of subtle, yet persistent, developmental speech disorders may be associated with structural brain anomalies. We suggest that the simultaneous involvement of speech and emotion regulation networks might result from disrupted neural organization during development, or compensatory or maladaptive plasticity. Future studies are required to examine whether the interplay between biological trait like diathesis (shyness, neuroticism) and the stressful experience of living with mild DFAS lead to the development of internalizing psychiatric disorders