Surface-state electron dynamics in noble metals

Theoretical investigations of surface-state electron dynamics in noble metals are reported. The dynamically screened interaction is computed, within many-body theory, by going beyond a free-electron description of the metal surface. Calculations of the inelastic linewidth of Shockley surface-state electrons and holes in these materials are also presented. While the linewidth of excited holes at the surface-state band edge (${\bf k}_\parallel=0$) is dominated by a two-dimensional decay channel, within the surface-state band itself, our calculations indicate that major contributions to the electron-electron interaction of surface-state electrons above the Fermi level come from the underlying bulk electrons.Comment: 17 pages, 7 figures, to appear in Prog. Surf. Sc

Health professionals' perspective on the promotion of e-mental health apps in the context of maternal depression.

Our study focuses on exploring (1) the intention of health professionals to use and recommend e-mental health applications, (2) how this intention of health professionals might be influenced, (3) which group of health professionals might be most accessible to promote e-mental health applications for maternal depression, and (4) for which tasks they rate them to be most useful. Based on a questionnaire informed by the theory of planned behavior, we collected 131 responses of U.S., Spanish, and Swiss health professionals in the field of pregnancy and maternal care (including psychologists, psychiatrists, midwives, and doctors) by means of an online survey. We analyzed the gathered data applying a structured equation model. Our study reveals that health professionals would in general intend to recommend and use e-mental health applications. However, their attitude towards e-mental health applications varies regarding the respective use cases and also differs among health professions. We offer three alternative propositions for private or public organizations, associations, or any other entity whose purpose is service to the community for introducing e-mental health applications into practice

Self-energy of image states on copper surfaces

We report extensive calculations of the imaginary part of the electron self-energy in the vicinity of the (100) and (111) surfaces of Cu. The quasiparticle self-energy is computed by going beyond a free-electron description of the metal surface, either within the GW approximation of many-body theory or with inclusion, within the GW$\Gamma$ approximation, of short-range exchange-correlation effects. Calculations of the decay rate of the first three image states on Cu(100) and the first image state on Cu(111) are also reported, and the impact of both band structure and many-body effects on the electron relaxation process is discussed.Comment: 8 pages, 5 figures, to appear in Phys. Rev.

An Assessment of Students’ Satisfaction in Higher Education

Student’s Satisfaction (SS) with a particular subject may impact the learning process, being the figure of attentiveness of the utmost importance over time, and also a very difficult undertaking to accomplish. To go forward with such exercise, a workable methodology for problem solving had to be built and tested. It is based on a thermodynamic approach to Knowledge Representation and Reasoning, which is the ultimate goal of SS assessment when working on a particular topic

Análisis de perfiles multivariados de valoración para la detección de alumnado con TDA-H

En este artículo se presentan los resultados del análisis realizado mediante análisis de conglomerados de k-medias para identificar perfiles multivariados de valoración para la identificación de niños con TDA-H. Para ello, se ha utilizado la Escala Magallanes (EMA-DDA), que requiere la evaluación del alumnado por parte de dos colectivos: padres y profesorado. Los estudios que se han realizado al respecto por parte de otros autores, si bien difieren en las escalas utilizadas, ponen de manifiesto que la nominación que realizan ambos colectivos suele discrepar no siendo concurrentes habitualmente en varias de las dimensiones que se evalúan. En un estudio anterior comprobamos que existían diferencias en varias de las dimensiones, desde el punto de vista univariado. Sin embargo, y considerando que la identificación se basa en umbrales que permiten la clasificación del alumnado, nos preguntamos si estas diferencias serían observables también a nivel multivariado entre ambos colectivos. La hipótesis interpretativa que asumimos, al igual que otros autores anteriormente, se basa sustancialmente en que ambos coxlectivos valoran al alumnado en diferentes contextos. Esta perspectiva podría apoyar, a nivel exploratorio, si esta apreciación puede estar a la base de las diferencias, y con ello poder orientar estudios posteriores de validación de carácter experimental o cuasi-experimental. El estudio realizado permite afirmar que hay una relación entre los perfiles multivariados que son producto de las valoraciones realizadas por ambos colectivos, por lo que apoya la línea de interpretación señalada anteriormente

Patrones diferenciales entre padres y profesorado en la detección de TDAH

El diagnóstico del Trastorno por Déficit de Atención con Hiperactividad (TDAH) se ha ido incrementando en los últimos años (CDC, 2014; UNESCO, 2011: 14). Los criterios sobre el TDAH se han ido aclarando entre la comunidad científica. Sin embargo, se trata de un trastorno complejo que requiere la participación en el diagnóstico de un equipo multidisciplinar. MÉTODO. En este estudio se analiza, con una muestra (N = 331) de alumnado de 6 a 9 años de Cuenca, la existencia de patrones diferenciales entre las dos valoraciones, mediante las Escalas EMA-D.D.A. (García-Pérez y Magaz, 2006). Se utilizan diversas aproximaciones de contraste de hipótesis, así como se valora la consistencia interna de las escalas. RESULTADOS. Las diferencias que se observan apuntan al influjo diferencial del contexto observacional y es coincidente con los resultados obtenidos en otros estudios. DISCUSIÓN. En el diagnóstico se requiere de una detección escolar, y una evaluación clínica y otra neurológica. En la detección escolar se utilizan escalas de evaluación comportamental, a las que responden padres y profesorado. El establecimiento del diagnóstico requiere que ambas valoraciones sean positivas, es decir, coincidentes en la detección de condición TDAH. Los estudios realizados muestran que existen diferencias entre ambas valoraciones hecho que analizaremos en la interpretación y conclusiones del presente trabajo

Usability, acceptability, and feasibility of two technology-based devices for mental health screening in perinatal care: A comparison of web versus app

The use of Information and Communication Technologies (web pages and apps) in mental health has boosted. However, it is unknown which of these two devices can be better in terms of feasibility and acceptability. Our aim is to compare the feasibility, usability, and user satisfaction of two devices (web vs mobile application) of an online program for perinatal depression screening called HappyMom. In total, 348 and 175 perinatal women registered into HappyMom web and app version, respectively. The assessment protocol included different biopsychosocial evaluations (twice during pregnancy and thrice in the postpartum) and a satisfaction questionnaire. Results showed that a higher percentage of women in the web sample (27.3–51.1%) responded to each assessment compared to the app sample (9.1–53.1%). A smaller proportion of women in web sample never responded to any assessments. By contrast, the percentage of women who responded to all assessments was higher in app sample (longitudinal retention sample was 4.6% of web users and 9.1% of app users). In general, high satisfaction was found in both web and app users. Our result showed that online assessment methods are feasible and acceptable by perinatal women. However, dropout rates are a real problem that urge a solution that will be discussed further in the paper. Web and App devices present different advantages and limitations. The choice of one of them must be made taking into account the study’s objective, the sample characteristics, and the dissemination possibilities