Van der Waals contribution to the inelastic atom-surface scattering

A calculation of the inelastic scattering rate of Xe atoms on Cu(111) is presented. We focus in the regimes of low and intermediate velocities, where the energy loss is mainly associated to the excitation electron-hole pairs in the substrate. We consider trajectories parallel to the surface and restrict ourselves to the Van der Waals contribution. The decay rate is calculated within a self-energy formulation. The effect of the response function of the substrate is studied by comparing the results obtained with two different approaches: the Specular Reflection Model and the Random Phase Approximation. In the latter, the surface is described by a finite slab and the wave functions are obtained from a one-dimensional model potential that describes the main features of the surface electronic structure while correctly retains the image-like asymptotic behaviour. We have also studied the influence of the surface state on the calculation, finding that it represents around 50% of the total probability of electron-hole pairs excitation.Comment: 7 pages, 4 figure

The stellar metallicity gradients in galaxy discs in a cosmological scenario

Indexación: Web of ScienceContext. The stellar metallicity gradients of disc galaxies provide information on disc assembly, star formation processes, and chemical evolution. They also might store information on dynamical processes that could affect the distribution of chemical elements in the gas phase and the stellar components. Understanding their joint effects within a hierarchical clustering scenario is of paramount importance. Aims. We studied the stellar metallicity gradients of simulated discs in a cosmological simulation. We explored the dependence of the stellar metallicity gradients on stellar age and on the size and mass of the stellar discs. Methods. We used a catalogue of galaxies with disc components selected from a cosmological hydrodynamical simulation performed including a physically motivated supernova feedback and chemical evolution. Disc components were defined based on angular momentum and binding energy criteria. The metallicity profiles were estimated for stars with different ages. We confront our numerical findings with results from the Calar Alto Legacy Integral Field Area (CALIFA) Survey. Results. The simulated stellar discs are found to have metallicity profiles with slopes in global agreement with observations. Low stellar mass galaxies tend to have a larger variety of metallicity slopes. When normalized by the half-mass radius, the stellar metallicity gradients do not show any dependence and the dispersion increases significantly, regardless of the galaxy mass. Galaxies with stellar masses of around 10(10) M-circle dot show steeper negative metallicity gradients. The stellar metallicity gradients correlate with the half-mass radius. However, the correlation signal is not present when they are normalized by the half-mass radius. Stellar discs with positive age gradients are detected to have negative and positive metallicity gradients, depending on the relative importance of recent star formation activity in the central regions. Conclusions. Our results suggest that inside-out formation is the main process responsible for the metallicity and age profiles. The large dispersions in the metallicity gradients as a function of stellar mass could be ascribed to the effects of dynamical processes such as mergers, interactions and/or migration as well as those regulating the conversion of gas into stars. The fingerprints of the inside-out formation seem better preserved by the stellar metallicity gradients as a function of the half-mass radius.http://www.aanda.org/articles/aa/abs/2016/08/aa28188-16/aa28188-16.htm

Healthcare gamification: Science mapping the body of literature

Healthcare gamification is a research topic being investigated in numerous contexts. As it is an interdisciplinary subject, it is hard for researchers to keep up with the research published in these venues. This paper aims to unveil the intellectual structure of the healthcare gamification research field through a systematic literature review. We apply a science map strategy to a 520- document database. This database was analyzed to build an evolutionary map revealing the most co-cited authors, their publications, and the theories used. Results evidence that referenced research can be classified into six research traditions. Finally, research opportunities are presented

Aspectos gerais do diagnóstico de tuberculose ativa em PVHA [videoaula]

Unidade 2, atividade 2 do curso Manejo da Coinfecção TB-HIV: videoaula em que a médica infectologista Denise Arakaki-Sanchez mostra como entender o diagnóstico de tuberculose nas pessoas vivendo com HIV/AIDS.Secretaria de Vigilância em Saúde, Ministério da Saúd

La pugna de funciones y su repercusión en la planificación y desarrollo nacional

El presente estudio de investigación basado en las experiencias observadas, permite la descripción o diagnóstico de la situación a ser analizada a fin de determinar cómo índice en la planificación y el desarrollo nacional la pugna de funciones, la misma que obedece a varias causas de diversa índole, que se pretende describir en este estudio, pues solo así se podrán recomendar las soluciones más adecuadas desde el punto de vista político-administrativo. El equilibrio en la gestión administrativa debe ser el pilar en el que se apoyen los órganos directivos del Gobierno, para que aunando esfuerzos se logre llevar adelante el desarrollo económico y social del país. Por lo tanto, corresponde a las autoridades de cada función la tarea de desempeñar el rol que les corresponde tratando de armonizar sus actividades con las de los demás, de tal manera, que los objetivos planteados en los planes de desarrollo se concreten de manera eficiente. Cabe aclarar, que no es tarea fácil buscar un entendimiento entre las funciones del Estado debido a las múltiples tendencias políticas existentes en el país, pues necesariamente sus representantes (que son los que ocupan puestos directivos), tratan de reflejar sus postulados en la misión que por voluntad del pueblo o por mandado les ha sido confiada

Trajetória, impacto e relevância

With its first issue published in August 2020, the Global Academic Nursing Journal comes up with a different proposal for the scientific community. Based on its scope focused on Health Sciences, more specifically on Nursing and Medicine, the year 2021 ends with 212 scientific articles published and an international scientific event, the I Global International Conference on Health: assistance, management, teaching and research, in order to fulfill its mission and values, which include: transparency, ethics, continuous improvement, respect for researchers and Science and the path hand in hand between Science, Research and Education.Com seu primeiro número publicado em agosto de 2020, o Global Academic Nursing Journal surge com uma proposta diferente para o meio científico. A partir de seu escopo voltado às Ciências da Saúde, mais especificamente à Enfermagem e Medicina, finaliza o ano de 2021 com 212 artigos científicos publicados e a realização de um evento científico internacional, a I Global International Conference on Health: assistência, gestão, ensino e pesquisa, a fim de cumprir com sua missão e valores, os quais incluem: transparência, ética, melhoria contínua, respeito aos pesquisadores e à Ciência e o caminho de mãos dadas entre Ciência, Pesquisa e Educação

Trajetória, impacto e relevância

With its first issue published in August 2020, the Global Academic Nursing Journal comes up with a different proposal for the scientific community. Based on its scope focused on Health Sciences, more specifically on Nursing and Medicine, the year 2021 ends with 212 scientific articles published and an international scientific event, the I Global International Conference on Health: assistance, management, teaching and research, in order to fulfill its mission and values, which include: transparency, ethics, continuous improvement, respect for researchers and Science and the path hand in hand between Science, Research and Education.Com seu primeiro número publicado em agosto de 2020, o Global Academic Nursing Journal surge com uma proposta diferente para o meio científico. A partir de seu escopo voltado às Ciências da Saúde, mais especificamente à Enfermagem e Medicina, finaliza o ano de 2021 com 212 artigos científicos publicados e a realização de um evento científico internacional, a I Global International Conference on Health: assistência, gestão, ensino e pesquisa, a fim de cumprir com sua missão e valores, os quais incluem: transparência, ética, melhoria contínua, respeito aos pesquisadores e à Ciência e o caminho de mãos dadas entre Ciência, Pesquisa e Educação

Increased markers of cardiac vagal activity in leucine-rich repeat kinase 2-associated Parkinson's disease.

PurposeCardiac autonomic dysfunction manifests as reduced heart rate variability (HRV) in idiopathic Parkinson's disease (PD), but no significant reduction has been found in PD patients who carry the LRRK2 mutation. Novel HRV features have not been investigated in these individuals. We aimed to assess cardiac autonomic modulation through standard and novel approaches to HRV analysis in individuals who carry the LRRK2 G2019S mutation.MethodsShort-term electrocardiograms were recorded in 14 LRRK2-associated PD patients, 25 LRRK2-non-manifesting carriers, 32 related non-carriers, 20 idiopathic PD patients, and 27 healthy controls. HRV measures were compared using regression modeling, controlling for age, sex, mean heart rate, and disease duration. Discriminant analysis highlighted the feature combination that best distinguished LRRK2-associated PD from controls.ResultsBeat-to-beat and global HRV measures were significantly increased in LRRK2-associated PD patients compared with controls (e.g., deceleration capacity of heart rate: p = 0.006) and idiopathic PD patients (e.g., 8th standardized moment of the interbeat interval distribution: p = 0.0003), respectively. LRRK2-associated PD patients also showed significantly increased irregularity of heart rate dynamics, as quantified by Rényi entropy, when compared with controls (p = 0.002) and idiopathic PD patients (p = 0.0004). Ordinal pattern statistics permitted the identification of LRRK2-associated PD individuals with 93% sensitivity and 93% specificity. Consistent results were found in a subgroup of LRRK2-non-manifesting carriers when compared with controls.ConclusionsIncreased beat-to-beat HRV in LRRK2 G2019S mutation carriers compared with controls and idiopathic PD patients may indicate augmented cardiac autonomic cholinergic activity, suggesting early impairment of central vagal feedback loops in LRRK2-associated PD