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Lu Z.,Piro M.H.A.,Christon M.A. 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.11
Mesh and turbulence model sensitivity analyses have been performed on computational fluid dynamics simulations executed with Hydra and ANSYS Fluent for a single CANadian Deuterium Uranium (CANDU) 37M nuclear fuel bundle placed within a standard pressure tube. The goal of this work was to perform a methodical analysis to objectively determine an appropriate mesh and to gauge the sensitivity of different turbulence models for CANDU subchannel flow under isothermal conditions. The boundary conditions and material properties are representative of normal operating conditions in a high-powered channel of the Darlington Nuclear Generating Station. Four meshes were generated with ANSYS Workbench Meshing, ranging from 22 to 84 million cells, and analyzed here to determine an appropriate level of mesh resolution and quality. Five turbulence models were compared in the turbulence model sensitivity analysis: standard k ε, RNG k ε, realizable k ε, SST k u, and the Reynolds Stress Model. The intent of this work was to gain confidence in mesh generation and turbulence model selection of a single bundle to inform the decision making of subsequent investigations of an entire fuel channel containing a string of twelve bundles.
Movimientos Feministas Negros en México
Luz E. Rodríguez Hernández 부산외국어대학교 중남미지역원 2024 이베로아메리카 Vol.26 No.1
El campo sobre los estudios de las poblaciones negras en México es escaso. No obstante, en los últimos años las investigaciones sobre el mismo han aumentado ofreciendo un campo de estudio poco explorado y, hasta cierto punto, problemático en muchos sentidos. Este trabajo pretende examinar y dar luz uno de los temas que tiene que ver con la población negra en México: los movimientos feministas negros. Para ello utilizaremos el concepto de la interseccionalidad como un marco teórico sólido. Esta investigación explora la presencia africana en México y narra la historia de cómo nacieron los movimientos afro-feministas en ese país y su trayectoria. Además, discute los valores de estos movimientos y las aportaciones desde sus prácticas políticas al tema de la interseccionalidad. A su vez, en esta investigación se exploran los ideales, particularidades, funcionamientos, intersecciones, potenciales y alcances de este movimiento en México y sus logros. The field of studies of black populations in Mexico is scarce. However, in recent years, research on it has increased, offering a field of study that has been little explored and, in some extent, problematic in many ways. This work aims to examine and shed light on one of the issues that have to do with the black population in Mexico: Black Feminist Movements. To achieve this, we will employ the concept of intersectionality as a robust theoretical framework. This research, with its approach, explores the African presence in Mexico and tells the story of how the Afro-feminist movements were born in that country and their trajectory. It also discusses the values of these movements and the contributions from their political practices to the topic of intersectionality. At the same time, this research explores the ideals, particularities, functioning, intersections, potentials, and a scope of this movement in Mexico and its achievements.
Luz Adriana Pedraza,Jessica Bautista,Daniel Uribe-Vé,lez 한국식물병리학회 2018 Plant Pathology Journal Vol.34 No.5
Rice world production is affected due to the growing impact of diseases such as bacterial panicle blight, produced by Burkholderia glumae. The pathogen-induced symptoms include seedling rot, grain rot and leafsheath browning in rice plants. It is currently recognized the entrance of this pathogen to the plant, from infected seeds and from environmental sources of the microorganism. However, it is still not fully elucidated the dynamics and permanence of the pathogen in the plant, from its entry until the development of disease symptoms in seedlings or panicles. In this work it was evaluated the infection of B. glumae rice plants, starting from inoculated seeds and substrates, and its subsequent monitoring after infection. Various organs of the plant during the vegetative stage and until the beginning of the reproductive stage, were evaluated. In both inoculation models, the bacteria was maintained in the plant as an endophyte between 1 × 101 and 1 × 105 cfu of B. glumae.g-1 of plant throughout the vegetative stage. An increase of bacterial population towards initiation of the panicle was observed, and in the maturity of the grain, an endophyte population was identified in the flag leaf at 1 × 106 cfu of B. glumae.g-1 fresh weight of rice plant, conducting towards the symptoms of bacterial panicle blight. The results found, suggest that B. glumae in rice plants developed from infected seeds or from the substrate, can colonize seedlings, establishing and maintaining a bacterial population over time, using rice plants as habitat to survive endophyticly until formation of bacterial panicle blight symptoms.
Luz S. Porter,Brian O. Porter,Virginia McCoy,Vivian Bango-Sanchez,Bonnie Kissel,Marjorie Williams,Sachin Nunnewar 한국간호과학회 2015 Asian Nursing Research Vol.9 No.4
Purpose: This study aimed to determine whether a blended Infant MassageeParenting Enhancement Program (IMPEP) improved maternal psychosocial health outcomes (parenting stress, depressive symptoms, self-esteem, maternal attachment) and maternal-infant interaction among substanceaddicted mothers (SAMs) actively engaged in outpatient rehabilitation. Methods: Designed as a randomized, three-group controlled trial testing two levels of psychoeducational intervention (IMPEP vs. PEP) and a control group (standard care parenting resources), the studywas conducted in two substance abuse centers in southeast Florida on a convenience sample of 138 recovering SAM-infant pairs. IMPEP or PEP classes were held weekly onWeeks 2e5, with data collected at baseline (Week 1),Week 6, andWeek 12 via structured interviews, observation (Observation Checklist onMaternal-Infant Interaction), and self-administered questionnaires (Abidin Parenting Stress Index, Beck Depression Inventory, Rosenberg Self-Esteem Scale, Muller's Maternal Attachment Inventory), analyzed descriptively and inferentially using Kruskall-Wallis analysis of variance and post hoc Wilcoxon rank sum and Mann-Whitney U tests. Results: Both IMPEP and PEP groups had significantly increased Parenting Stress Index scores (decreased parenting stress) and decreased Beck Depression Inventory scores (decreased depressive symptoms) compared to controls at Week 12, whereas there were no clinically meaningful differences among study groups in Rosenberg Self-Esteem Scale, Muller's Maternal Attachment Inventory, or Observation Checklist on Maternal-Infant Interaction scores. Only the IMPEP group showed significant improvements in both psychological and physical (waist-hip ratio) measures of parenting stress over time. Conclusions: The findings suggest that infant massage blended into a structured parenting program has value-added effects in decreasing parenting stress and maternal depressive symptoms, but not on SAM's self-esteem, attachment, or maternal-infant interaction.