739 research outputs found
Comportamiento de la energía y el momento magnético en la dinámica de partículas cargadas en campos electromagnéticos turbulentos
No full textMediante la implementación de simulaciones numéricas directas con 2563 puntos de grilla, buscamos estudiar la dinámica de flujos MHD compresibles en un régimen turbulento bajo la acción de un campo magnético guía. Simulamos además partículas de prueba inmersas en el flujo como una primera aproximación al comportamiento de las partículas individuales que conforman al fluido. Las condiciones que modelamos son relevantes para el plasma espacial, pero particularmente para el viento y la corona solar. A lo largo del trabajo nos proponemos examinar el impacto que tienen los distintos términos de ley de Ohm generalizada sobre la dinámica de las partículas. Nos interesa también su importancia relativa. El principal resultado que encontramos es una aceleración paralela al campo guía que es inusual en este tipo de fluidos y es causada por el término del gradiente de presión electrónica. Llegamos a esta conclusión analizando las distribuciones del momento magnético en función de la energía cinética de las partículas de prueba. Además analizamos que sucede con la energía cinética de las partículas, distinguiendo entre la componente paralela y perpendicular al campo guía, si se tiene en cuenta o no el efecto Hall y la presión electrónica. Para el caso con presión electrónica, que es en el cual más nos concentramos, descubrimos un aumento de la energía paralela en detrimento de la perpendicular. Con el fin de comprender la razón detrás de esto, analizamos la estadística y estructura del campo eléctrico y, en particular, del término del gradiente de presión electrónica. Encontramos que este último, a pesar de ser predominante en la dirección perpendicular, tiene un aporte más significativo a la componente paralela del campo total. Esto ayuda a explicar la aceleración paralela inusual que genera. Además, vemos que este campo está formado por estructuras finas de gran intensidad que empujan paralelamente a las partículas que pasan a través de ellas. No encontramos semejanza entre estas estructuras y las ya conocidas hojas de corriente. Por último estudiamos partículas individuales. En particular nos quedamos con aquellas que presentan una velocidad paralela considerable en comparación con la perpendicular. Mostramos que la aceleración paralela que sufren se corresponde con la estructura del campo antes descripta, es decir que experimentan un salto en su velocidad paralela al momento de pasar por una zona de gran intensidad del gradiente de presión electrónica. También descartamos que esta interacción sea de tipo pitch-angle scattering dado que se produce una energización neta en lugar de una redistribución de la energía. Formamos así una idea más clara de por qué las partículas se aceleran paralelamente al considerar el efecto de la presión electrónica, y de cuales son los mecanismos que ocasionan esta aceleración.Fil: Balzarini, Bianca. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina
Bianca Garavelli studiosa e scrittrice
No full textBianca Garavelli (Vigevano, 1958-2021) was a highly regarded figure in the literary world, both on the critical and creative side. Author of important critical studies on Dante and of a successful commentary on the Commediam (begun under the supervision of Maria Corti but then continued independently), as well as critic and reviewer for newspapers and periodicals, Garavelli also wrote and published poems, novels and short stories. This article offers an exhaustive bio-bibliographical profile of Bianca Garavelli, whose literary work in various fields is reconstructed and critically examined
Let´s (watch me) play : which factors relate to Let´s Play addiction?
No full textAuthor Bianca Haun, BScZusammenfassungen in englischer SpracheMasterarbeit Universität Linz 201
A combined intervention for executive deficits and anxiety in Parkinson's patients: a case study
No full textParkinson’s disease (PD) is a neurodegenerative disorder most commonly associated with motor symptomatology, yet often presenting with deficits in attention, executive functioning (EF; e.g., planning, mental flexibility, complex attention), anxiety, and depression, with debilitating effects on patients’ quality of life. Current interventions, including pharmacological and surgical methods show efficacy in motor symptom management, yet produce equivocal results in addressing non-motor dysfunction. The goal of this paper was to describe and investigate the efficacy and patient acceptance of a nonpharmacological intervention for treatment of executive dysfunction (ED) and anxiety in PD, in the context of a case study (the case of Mr. K). Brain and Mind Fitness Program (BMFP) is a short-term intervention, consisting of a combination of cognitive remediation and cognitive behavioral therapy (CBT). BMFP was demonstrated to be fully acceptable to Mr. K, based on ratings of 4 feasibility dimensions (fatigue, effort, progress, and enjoyment). The program also proved to be efficacious in alleviating Mr. K’s anxiety and depression symptoms, with benefits extending over the treatment period. BMFP, elsewhere shown to be an effective cognitive re-training of EF in PD patients, exhibited limited gains in the case of Mr. K., possibly due to his relatively intact cognitive abilities at baseline. Despite its limitations, the case of Mr. K presents a novel approach to treatment of PD non-motor symptoms and a learning opportunity for researchers and clinicians interested in expanding their knowledge across disciplines.Psy. D.Includes bibliographical referencesby Bianca R. Georgesc
BIANCA (Brain Intensity AbNormality Classification Algorithm): a new tool for automated segmentation of white matter hyperintensities
No full textReliable quantification of white matter hyperintensities of presumed vascular origin (WMHs) is increasingly needed, given the presence of these MRI findings in patients with several neurological and vascular disorders, as well as in elderly healthy subjects. We present BIANCA (Brain Intensity AbNormality Classification Algorithm), a fully automated, supervised method for WMH detection, based on the k-nearest neighbour (k-NN) algorithm. Relative to previous k-NN based segmentation methods, BIANCA offers different options for weighting the spatial information, local spatial intensity averaging, and different options for the choice of the number and location of the training points. BIANCA is multimodal and highly flexible so that the user can adapt the tool to their protocol and specific needs. We optimised and validated BIANCA on two datasets with different MRI protocols and patient populations (a “predominantly neurodegenerative” and a “predominantly vascular” cohort). BIANCA was first optimised on a subset of images for each dataset in terms of overlap and volumetric agreement with a manually segmented WMH mask. The correlation between the volumes extracted with BIANCA (using the optimised set of options), the volumes extracted from the manual masks and visual ratings showed that BIANCA is a valid alternative to manual segmentation. The optimised set of options was then applied to the whole cohorts and the resulting WMH volume estimates showed good correlations with visual ratings and with age. Finally, we performed a reproducibility test, to evaluate the robustness of BIANCA, and compared BIANCA performance against existing methods. Our findings suggest that BIANCA, which will be freely available as part of the FSL package, is a reliable method for automated WMH segmentation in large cross-sectional cohort studies. © 2016 The Author
Dataset: Culturally Responsive Supervision
No full textThesis title: A Study Exploring the Supervisory Relationship in the Context of Culturally Responsive Supervision: A Supervisee’s Perspective
Quantitative and qualitative survey data on supervisee perspectives of culturally responsive supervision and their supervisory relationship. The data was collected by the primary author and can be viewed in SPSS.
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Il chiostro dell'abbazia benedettina di Monreale: documenti d'archivio inediti per ricostruire la storia degli interventi di restauro tra 1867 e 1907.
No full textThe Cloister of the Monreale Benedictine Abbey: New Archival Documents to Reconstruct the History of Restoration Work Between 1867 and 1907
Soon after the unification of Italy, the cloister of the Monreale benedictine Abbey underwent restoration work supervised by the architect Giuseppe Patricolo which transformed the cloister image, determining largely his current configuration. The history of these restoration interventions occurred between 1867 and 1907 has been reconstructed by the author through the examina- tion of unpublished archival documents and pictures, equally relevant to summarize in detail the most important works which changed the aspect of the cloister courtyard
Forecast horizon of 5th – 6th – 7th long wave and short-period of contraction in economic cycles
No full textThe purpose of this essay is to determine the forecast horizon of the fifth, sixth and seventh long wave. As the period of each long wave can change according to the data, it has been used a deterministic approach, based on historical chronologies of USA and UK economies worked out by several scholars, to determine average timing, period and forecast error of future long waves. In addition, the analysis shows that long waves have average upwave period longer than average downwave one. This result is also confirmed by US Business Cycles that have average contractions shorter than expansions phase over time.Forecast Horizon, Long Waves, Kondratieff Waves, Business Cycles, Asymmetric Path
Echoes of Childhood: Bianca Pitzorno Between Self-memory and Storytelling
No full textOver the years, Bianca Pitzorno (1942), one of the most important Italian writers for children, has given us childhood echoes through which you can trace an itinerary of female education between non-fiction and autobiographical unveilings. "Ascolta il mio cuore" (1991) is an example, as well as "Storia delle mie storie" (1995), in which the author reflects deeply on writing addressed to children starting from correspondences, identifications and projections having ancient origins, in her inner world. Reading the evidence, you can deduce the identity of a considerable writer on the side of girls and boys
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