Micromagnetic simulations of magnetoelastic heterostructures

Treballs Finals de Grau de Física, Facultat de Física, Universitat de Barcelona, Curs: 2018, Tutora: Arantxa Fraile RodríguezThe system formed by a 10 nm thin film of Ni and a 10 μm-thick V2O3 layer shows a reversible enhancement of the coercivity (∼300%) due to the structural phase transition (metal/insulator) of the V2O3layer. Performing micromagnetic simulations and comparing the results with experimental data we have studied the coupling mechanism on the Ni/V2O3 interface. We have proven that this coupling is responsible for the coercivity enhancement and that the magnetisation domains in the Ni do not follow exactly the metal/insulator domains on the V2O3. Finally, we have determined that the results of the simulations are in agreement with a phase coexistence in V2O3

Micromagnetic simulations of magnetoelastic heterostructures

Treballs Finals de Grau de Física, Facultat de Física, Universitat de Barcelona, Curs: 2018, Tutora: Arantxa Fraile RodríguezThe system formed by a 10 nm thin film of Ni and a 10 μm-thick V2O3 layer shows a reversible enhancement of the coercivity (∼300%) due to the structural phase transition (metal/insulator) of the V2O3layer. Performing micromagnetic simulations and comparing the results with experimental data we have studied the coupling mechanism on the Ni/V2O3 interface. We have proven that this coupling is responsible for the coercivity enhancement and that the magnetisation domains in the Ni do not follow exactly the metal/insulator domains on the V2O3. Finally, we have determined that the results of the simulations are in agreement with a phase coexistence in V2O3

An Examination of Business and Workflow Models for U.S. Newspapers

The newspaper industry is being redefined by changes of historic proportions. This redefinition has resulted in a disruptive shift within the core audience of newspapers. Thus, many pundits of the industry have commented that the traditional business model is broken. The reason for this declarative is primarily due to the reduction in circulation and the transference of audience attention to non-print media. Subsequently, the printed newspaper is no longer the primary news information source for most people. The objectives of this research were: 1. To acquire a unified understanding of the traditional and emerging newspaper publishing business models for large, medium, and small newspapers, and to assess what newspapers are doing to change their business strategies. 2. To understand the prepress and production workflows for newspapers, to evaluate how they compliment and interfere with each other, and to determine if there are differences based on size of the newspaper. 3. To review audience analysis for the various print and on-line newspaper products. To achieve these objectives, an extensive survey of five different newspaper organizations was conducted. In addition, the survey was supported by in-depth secondary research

Tunable circular dichroism through absorption in coupled optical modes of twisted triskelia nanostructures

We present a system consisting of two stacked chiral plasmonic nanoelements, so-called triskelia, that exhibits a high degree of circular dichroism. The optical modes arising from the interactions between the two elements are the main responsible for the dichroic signal. Their excitation in the absorption cross section is favored when the circular polarization of the light is opposite to the helicity of the system, so that an intense near-feld distribution with 3D character is excited between the two triskelia, which in turn causes the dichroic response. Therefore, the stacking, in itself, provides a simple way to tune both the value of the circular dichroism, up to 60%, and its spectral distribution in the visible and near infrared range. We show how these interaction-driven modes can be controlled by fnely tuning the distance and the relative twist angle between the triskelia, yielding maximum values of the dichroism at 20° and 100° for left- and right-handed circularly polarized light, respectively. Despite the three-fold symmetry of the elements, these two situations are not completely equivalent since the interplay between the handedness of the stack and the chirality of each single element breaks the symmetry between clockwise and anticlockwise rotation angles around 0°. This reveals the occurrence of clear helicity-dependent resonances. The proposed structure can be thus fnely tuned to tailor the dichroic signal for applications at will, such as highly efcient helicity-sensitive surface spectroscopies or single-photon polarization detectors, among others

Fuerza y equilibrio en el adulto mayor del hogar de paso Jesús y María

El trabajo de investigación se fundamentó en la toma de test de fuerza en extremidades inferiores y equilibrio estático a encontrados en el libro Senior Fitness Test Manual-2nd Edition de Roberta Rikli, C. Jessie Jones , siendo la investigación cuantitativa trasversal descriptiva con un enfoque empírico analítico donde la recolección de los datos arrojados junto con la aplicación de los test proyectaron resultados en cuanto al estado de la capacidad condicional fuerza y la capacidad coordinativa equilibrio , teniendo en cuenta las características de la población , donde se contribuye a recomendar trabajos desde la actividad física para la línea de investigación en Actividad Física de la Licenciatura en Educación Física, Recreación y Deportes de la Corporación universitaria Minuto de Dios

Fuerza y equilibrio en el adulto mayor del hogar de paso Jesús y María

El trabajo de investigación se fundamentó en la toma de test de fuerza en extremidades inferiores y equilibrio estático a encontrados en el libro Senior Fitness Test Manual-2nd Edition de Roberta Rikli, C. Jessie Jones , siendo la investigación cuantitativa trasversal descriptiva con un enfoque empírico analítico donde la recolección de los datos arrojados junto con la aplicación de los test proyectaron resultados en cuanto al estado de la capacidad condicional fuerza y la capacidad coordinativa equilibrio , teniendo en cuenta las características de la población , donde se contribuye a recomendar trabajos desde la actividad física para la línea de investigación en Actividad Física de la Licenciatura en Educación Física, Recreación y Deportes de la Corporación universitaria Minuto de Dios

Refining memory assessment of elderly people with cognitive impairment:Insights from the short-term memory binding test

Alzheimer’s disease (AD) affects temporary memory for bound features more remarkably than for individual features. Such selective impairments manifest from presymptomatic through dementia stages via titration procedures. A recent study suggested that without titration and with high memory load the binding selectivity may disappear in people at risk of AD such as those with Mild Cognitive Impairment (MCI). We compared data from two studies on temporary binding which assessed people with MCI and controls using different memory loads (2 or 3 items). Selective binding impairments were found in MCI, but relative to controls, such selectivity was contingent upon memory load (i.e., present with 2 items). Further analysis with MCI people who tested positive to neuroimaging biomarkers (i.e., hippocampal atrophy) confirmed that this specific binding impairments are a feature of prodromal AD. The temporary binding task has been recently suggested by consensus papers as a potential screening tool for AD. The results presented here inform on task properties that can maximise the reliability of this new assessment tool for the detection of memory impairments in prodromal cases of AD

Rural-urban gradients and all-cause, cardiovascular and cancer mortality in Spain using individual data

The literature reporting on rural-urban health status disparities remains inconclusive. We analyzed data from a longitudinal population-based study using individual observations. Our results show that the risks of all-cause and cancer mortality are greater in large cities than in other municipalities, with no clear urban-rural gradient. Not differences were found among territories in cardiovascular mortality.This work was supported by the Institute of Health Carlos III (ISCIII), Ministry of Science and Innovation [grant number PI19CIII/00021 and FI17CIII/00003].S

NEMA Performance Evaluation of CareMiBrain dedicated brain PET and Comparison with the whole-body and dedicated brain PET systems

[EN] This article presents system performance studies of the CareMiBrain dedicated brain PET according to NEMA NU 2-2012 (for whole-body PETS) and NU 4-2008 (for preclinical PETs). This scanner is based on monolithic LYSO crystals coupled to silicon photomultipliers. The results obtained for both protocols are compared with current commercial whole body PETs and dedicated brain PETs found in the literature. Spatial resolution, sensitivity, NECR and scatter-fraction are characterized with NEMA standards, as well as an image quality study. A customized image quality phantom is proposed as NEMA phantoms do not fulfil the necessities of dedicated brain PETs. The full-width half maximum of the radial/tangential/ axial spatial resolution of CareMiBrain reconstructed with FBP at 10 and 100 mm from the system center were, respectively, 1.87/1.68/1.39 mm and 1.86/1.91/1.40 mm (NU 2-2012) and 1.58/1.45/1.40 mm and 1.64/1.66/1.44 mm (NU 4-2008). Peak NECR was 49 kcps@287 MBq with a scatter fraction of 48% using NU 2-2012 phantom. The sensitivity was 13.82 cps/kBq at the center of the FOV (NU 2-2012) and 10% (NU 4-2008). Contrast recovery coefficients for customizing image quality phantom were 0.73/0.78/1.14/1.01 for the 4.5/6/9/12 mm diameter rods. The performance characteristics of CareMiBrain are at the top of the current technologies for PET systems. Dedicated brain PET systems significantly improve spatial resolution and sensitivity, but present worse results in count rate measurements and scatter-fraction tests. As for the comparison of preclinical and clinical standards, the results obtained for solid and liquid sources were similar.This study was funded by the Spanish Ministry of Science, Innovation and University under grant RTC-2016-5186-1, a project co-financed by the European Union through the European Regional Development Fund (ERDF). 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Competitividad desde las Metodologías de estimación y la gestión de los costos en la industria del software : Competitiveness from estimation methodologies and cost management in the software industry

El dinamismo de la industria del software y la exigencia de ser más competentes en el mercado nacional e internacional hace necesario que se evalúen y replanteen la forma de estimar los costos de fabricación de software. En este artículo se presentan las diferentes metodologías usadas a la hora de estimar un proyecto de desarrollo con el fin de identificar los ítems asociados al ‘Software o Hardware’ que no son tenidos en cuenta pero que también inciden en los costos de un proyecto de desarrollo. Por otra parte, también se habla acerca de las metodologías ágiles existentes que en los últimos años han sido una herramienta de apoyo para los proyectos de desarrollo, las cuales permiten mayor flexibilidad e inmediatez para moldearse al cambio del día a día de las necesidades del negocio y métodos de estimación. Para este caso puntual se busca identificar en Colombia qué metodología predomina en las organizaciones, y qué perspectiva se tiene de la forma de estimar en los proyectos de desarrollo de software con el fin de determinar la efectividad de los métodos actuales de estimación y que mejoras se pueden implementar