20 research outputs found

    Análisis cinemático y diseño de un mecanismo de cuatro barras para falange proximal de dedo antropomórfico

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    This paper shows the kinematic analysis and a parametric design methodology of the proximal phalanx for an anthropomorphic finger using a one degree-of-freedom. The mechanism design is done by taking ten positions from its output bar. A dynamic simulation is given using a CAD model to verify the feasibility of the mechanism results. Finally, we show the comparative analysis between kinematics numerically obtained and other experimental results.En este artículo, se presenta el análisis cinemático y una metodología de diseño paramétrico de la falange proximal para un dedo antropomórfico1 de un grado de libertad. El diseño del mecanismo se lleva a cabo, tomando diez posiciones de la barra de salida del mismo. Se presenta la simulación dinámica, utilizando un modelo de CAD para comprobar la factibilidad de los resultados obtenidos por el mecanismo. Por último, se muestra el análisis comparativo entre los resultados de la cinemática obtenidos numéricamente y los experimentales

    Geriatric care‐related outcomes in patients 75 years and older admitted to a pulmonary disease center and predictors for hospital‐related complications

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    Abstract Objective The primary aim of this study was to evaluate the influence of targeted interventions, administered through comprehensive geriatric assessments on the incidence of hospitalization‐related complications among older adults diagnosed with pulmonary diseases. Methods A retrospective analysis of medical records encompassed individuals aged 75 years and older who were admitted to a lung center during the period spanning from March to June 2023. These admissions occurred in a context where standardized geriatric management protocols were systematically implemented. This study's scope extended to assessing the prevalence of hospital‐related complications, encompassing delirium and pressure ulcers. A rigorous multivariate logistic regression analysis was conducted to discern and characterize associated factors. Results The integration of comprehensive geriatric assessment yielded a substantial reduction in in‐hospital complications among the cohort of 118 patients (mean age : 82.1 ± 5.6 years, 44.5% women). The incidence of delirium decreased from 53.3% to 21.8% [odds ratio (OR): 0.246, 95% confidence interval (CI): 0.134–0.450, p < 0.001], whereas the presence of pressure ulcers decreased from 43.9% to 25% (OR: 0.395, 95% CI: 0.217–0.715, p < 0.001). The multivariate analysis uncovered independent associations between delirium and variables including community‐acquired pneumonia (OR: 4.417, 95% CI : 1.574–12.395, p = 0.005), severe disability (OR: 2.981, 95% CI: 1.140–7.798, p = 0.026), and hearing loss (OR: 3.219, 95% CI : 1.260–8.170, p = 0.014). Prolonged hospital stays emerged as the sole factor significantly associated with pressure ulcers (OR: 1.071, 95% CI: 1.033–1.109). Furthermore, an intricate bidirectional relationship was evident between delirium and pressure ulcers (OR: 7.158, 95% CI: 2.962–17.300, p < 0.01). Conclusion In conjunction with its consequent interventions, geriatric evaluation assumes a pivotal role in ameliorating adverse outcomes stemming from hospitalization among older adults afflicted with pulmonary ailments. This role gains particular salience among subpopulations characterized by heightened susceptibility, such as individuals coping with hearing loss and severe disability

    Leaf morphospace in Euphorbia tithymaloides (Euphorbiaceae) was likely shaped by evolutionary contingencies rather than climate

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    Background and aims – Understanding whether variation in plant attributes is primarily driven by selection or historical contingencies is a main goal in evolutionary biology. We characterize leaf diversity in Euphorbia tithymaloides and identify patterns related to taxonomy, geography, biogeography, and climate that provide insights on the role of ecological and evolutionary forces in shaping its leaf diversity. Material and methods – We constructed a leaf morphospace using linear morphometric measurements derived from images (leaf maximum length and width, area, and perimeter), and calculated indexes that reflect aspects of leaf shape (leaf aspect ratio, area-perimeter ratio, obovate index, and circularity). Climatic data were extracted from WorldClim layers based on occurrence data. We visualized leaf and climate spaces with principal components analyses and used Kruskal-Wallis tests, linear models, and Mantel tests to test predictors of leaf variation (taxonomy, geography, climate). Key results – We document differences in the foliar morphospace occupied by subspecies of Euphorbia tithymaloides, and a substantial overlap in the climatic space they occupy, suggesting that foliar differences among subspecies are not likely driven by climate. Foliar morphology can be used as a proxy for subspecies in E. tithymaloides, as taxonomy explains a large proportion of variation in leaf morphology (10–60%). Geography and climate explain a small proportion of foliar variation not explained by subspecies (~3% and 5%, respectively). Temperature, precipitation, and seasonality are the climate variables with most explicative power. Conclusion – Leaf diversity in E. tithymaloides is not driven by climate, instead, it is likely the result of evolutionary contingencies faced by this species throughout its historical range expansion across the Caribbean Basin. This study shows that historical contingencies in addition to selection acting on ecological processes can shape foliar diversity and expand a lineage’s potential to explore morphological and climatic spaces

    Análisis cinemático y diseño de un mecanismo de cuatro barras para falange proximal de dedo antropomórfico

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    En este artículo, se presenta el análisis cinemático y una metodología de diseño paramétrico de la falange proximal para un dedo antropomórfico1 de un grado de libertad. El diseño del mecanismo se lleva a cabo, tomando diez posiciones de la barra de salida del mismo. Se presenta la simulación dinámica, utilizando un modelo de CAD para comprobar la factibilidad de los resultados obtenidos por el mecanismo. Por último, se muestra el análisis comparativo entre los resultados de la cinemática obtenidos numéricamente y los experimentales.this paper shows the kinematic analysis and a parametric design methodology of the proximal phalanx for an anthropomorphic finger using a one degree-of-freedom. the mechanism design is done by taking ten positions from its output bar. a dynamic simulation is given using a Cad model to verify the feasibility of the mechanism results. Finally, we show the comparative analysis between kinematics numerically obtained and other experimental results

    Análisis cinemático y diseño de un mecanismo de cuatro barras para falange proximal de dedo antropomórfico

    Get PDF
    This paper shows the kinematic analysis and a parametric design methodology of the proximal phalanx for an anthropomorphic finger using a one degree-of-freedom. The mechanism design is done by taking ten positions from its output bar. A dynamic simulation is given using a CAD model to verify the feasibility of the mechanism results. Finally, we show the comparative analysis between kinematics numerically obtained and other experimental results.En este artículo, se presenta el análisis cinemático y una metodología de diseño paramétrico de la falange proximal para un dedo antropomórfico1 de un grado de libertad. El diseño del mecanismo se lleva a cabo, tomando diez posiciones de la barra de salida del mismo. Se presenta la simulación dinámica, utilizando un modelo de CAD para comprobar la factibilidad de los resultados obtenidos por el mecanismo. Por último, se muestra el análisis comparativo entre los resultados de la cinemática obtenidos numéricamente y los experimentales
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