Search results for "IPA"

On the Left Ventricular Remodeling of Patients with Stenotic Aortic Valve: A Statistical Shape Analysis

2021

The left ventricle (LV) constantly changes its shape and function as a response to pathological conditions, and this process is known as remodeling. In the presence of aortic stenosis (AS), the degenerative process is not limited to the aortic valve but also involves the remodeling of LV. Statistical shape analysis (SSA) offers a powerful tool for the visualization and quantification of the geometrical and functional patterns of any anatomic changes. In this paper, a SSA method was developed to determine shape descriptors of the LV under different degrees of AS and thus to shed light on the mechanistic link between shape and function. A total of n=86 patients underwent computed tomography (…

Statistical shape analysis of ascending thoracic aortic aneurysm: Correlation between shape and biomechanical descriptors

2020

An ascending thoracic aortic aneurysm (ATAA) is a heterogeneous disease showing different patterns of aortic dilatation and valve morphologies, each with distinct clinical course. This study aimed to explore the aortic morphology and the associations between shape and function in a population of ATAA, while further assessing novel risk models of aortic surgery not based on aortic size. Shape variability of n = 106 patients with ATAA and different valve morphologies (i.e., bicuspid versus tricuspid aortic valve) was estimated by statistical shape analysis (SSA) to compute a mean aortic shape and its deformation. Once the computational atlas was built, principal component analysis (PCA) allow…

Overexpression of human hepatic lipase and ApoE in transgenic rabbits attenuates response to dietary cholesterol and alters lipoprotein subclass dist…

1999

Abstract —The effect of the expression of human hepatic lipase (HL) or human apoE on plasma lipoproteins in transgenic rabbits in response to dietary cholesterol was compared with the response of nontransgenic control rabbits. Supplementation of a chow diet with 0.3% cholesterol and 3.0% soybean oil for 10 weeks resulted in markedly increased levels of plasma cholesterol and VLDL and IDL in control rabbits as expected. Expression of either HL or apoE reduced plasma cholesterol response by 75% and 60%, respectively. The HL transgenic rabbits had substantial reductions in medium and small VLDL and IDL fractions but not in larger VLDL. LDL levels were also reduced, with a shift from larger, m…

Gelchromatographie. 8. Mitt.: Vernetzte copolymere des vinylacetats

1969

Die Eigenschaften von vernetzten Copolymeren des Vinylacetats wurden in Abhangigkeit von den Herstellungsbedingungen gepruft. Als Vernetzungsmittel dienten Divinyladipat und Butandiol-(1.4)-divinylather. Mit homogen-vernetzten Gelen konnen Ausschlusmolekulargewichte bis etwa 4000 erzielt werden: zwischen dem spezifischen Gelbettvolumen und dem Ausschlusmolekulargewicht besteht eine lineare Beziehung. Die heterogen-vernetzende Copolymerisation des Vinylacetats in Gegenwart verschiedener inerter Verdunnungsmittel fuhrt zu Gelen mit Ausschlusmolekulargewichten uber 106. Die vernetzten Copolymeren wurden durch ihre scheinbare Dichte, durch die Aufnahme von Losungs- und Fallungsmitteln, durch di…

Energy dissipative solutions to the Kobayashi-Warren-Carter system

2017

In this paper we study a variational system of two parabolic PDEs, called the Kobayashi-Warren-Carter system, which models the grain boundary motion in a polycrystal. The focus of the study is the existence of solutions to this system which dissipate the associated energy functional. We obtain existence of this type of solutions via a suitable approximation of the energy functional with Laplacians and an extra regularization of the weighted total variation term of the energy. As a byproduct of this result, we also prove some $\Gamma$-convergence results concerning weighted total variations and the corresponding time-dependent cases. Finally, the regularity obtained for the solutions togethe…

Energy dissipative characteristic schemes for the diffusive Oldroyd-B viscoelastic fluid

2015

Participant Observation in Online Multiplayer Communities

2011

This chapter discusses participant observation as a method of data collection for studying social interaction in online multiplayer games and the communities within them. Participant observation has its roots in the social sciences, and especially in the field of anthropology. True to a natural inquiry approach, studies utilizing participant observation try to understand the actual habitat or “lifeworld” of those participating in the study. This chapter looks at various practical issues connected to conducting participant observation in online multiplayer communities. Examples of data collection are presented, including saving log files, capturing images and video, and writing field notes. …

Melancolía de mujeres Solas.

2019

En este trabajo vamos a relacionar la película de Benito Zambrano Solas (1999) con el género o familia de films del melodrama de la mujer desconocida que propone Cavell (2009). Para ello, después de introducir el “método” asociativo cavelliano, vamos a presentar los rasgos más característicos de dicho género y la imagen de la mujer que en ellos se dibuja: el autoconocimiento de la protagonista, su relación con el mundo masculino, su emancipación del mismo a través de la conquista de la voz. El resto del trabajo consiste en una propuesta de lectura de la película de Zambrano, dentro de un marco cavelliano, pero subrayando el papel de la melancolía como mito cultural (Bartra 2001), la relació…

[How to design workshops to promote health in community groups].

2013

Resumen Una de las estrategias de promoción de la salud es el desarrollo de habilidades para la vida considerando a las propias personas como principal recurso para la salud. Un taller ha de conseguir que sus participantes se conviertan en «activos» para tomar decisiones y generar salud, centrándose en el desarrollo y adquisición de habilidades en grupo de una manera motivadora y con la finalidad de alcanzar unos objetivos. Los conceptos que fundamentan el diseño de un taller y que han de plantearse como etapa 0 son: planificación participativa, capacitar, aprendizaje significativo, aprender en grupo y técnicas participativas. Las etapas que se deben seguir para diseñar un taller y facilita…

Science Advances

2019

River ecosystems receive and process vast quantities of terrestrial organic carbon, the fate of which depends strongly on microbial activity. Variation in and controls of processing rates, however, are poorly characterized at the global scale. In response, we used a peer-sourced research network and a highly standardized carbon processing assay to conduct a global-scale field experiment in greater than 1000 river and riparian sites. We found that Earth’s biomes have distinct carbon processing signatures. Slow processing is evident across latitudes, whereas rapid rates are restricted to lower latitudes. Both the mean rate and variability decline with latitude, suggesting temperature constrai…