High-Mobility Toolkit for Quantum Dot Films

Semiconductor colloidal quantum dots (CQDs) are being increasingly exploited in electronics, optoelectronics, and solar energy harvesting, using a variety of different architectures, mostly based on ordered 2D or 3D arrays of these nanostructures. A crucial issue for optimizing the performance of such devices is the ability to predict and tune the transport properties of these assemblies. In this work we provide general guidelines to precisely that effect, indicating specific materials, crystal structures, lattice arrangements, surface stoichiometries, and morphologies that favor high electron mobilities in these systems and, conversely, materials that will exhibit low mobilities if nanostructured. At the same time our results evidence a surprising independence of the film’s transport properties from those of the bulk material from which the dots are made, highlighting the crucial role of theoretical modeling to guide device design

Effective Approach for an Order-of-Magnitude-Accurate Evaluation of the Electron Mobility in Colloidal Quantum Dot Films

Being able to estimate the electron mobility of colloidal quantum dot films is of great importance for determining their suitability to specific applications and would lead to huge savings in terms of time and resources that may otherwise be wasted trying to build and optimize a device whose transport characteristics can be predicted to be poor from the outset. This task is however complicated by the complexity of the system and the large number of parameters that can potentially affect the final result. Here, we derive a simple, fitting-parameter-free, order-of-magnitude-accurate expression to estimate the dark mobility of such 2D structures and validate it by applying it to real systems and comparing its predictions with those of other recently proposed approaches and with available experimental data. The results quantify the superiority of our expression to estimate mobilities in colloidal quantum dot films

Efficient, non-stochastic, Monte-Carlo-like-accurate method for the calculation of the temperature-dependent mobility in nanocrystal films

We present a new non-stochastic framework for the calculation of the temperature dependence of the mobility in nanocrystal films, that enables speed-ups of several orders of magnitude compared to conventional Monte Carlo approaches, while maintaining a similar accuracy. Our model identifies a new contribution to the reduction of the mobility with increasing temperature in these systems (conventionally attributed to interactions with phonons), that alone is sufficient to explain the observed experimental trend up to room temperature. Comparison of our results with the theoretical predictions of the hopping model and the observed temperature dependence of recent field-effect mobility measurements in nanocrystal films, provides the means to discriminate between band-like and hopping transport and a definitive answer to whether the former has been achieved in quantum dot films

A spectro-polarimetric study of the planet-hosting G dwarf, HD 147513

© ESO, 2015. Reproduced with permission from Astronomy & Astrophysics, © ESO. This is the final published version of the work, which was originally published at: http://dx.doi.org/10.1051/0004-6361/201526595The results from a spectro-polarimetric study of the planet-hosting Sun-like star, HD 147513 (G5V), are presented here. Robust detections of Zeeman signatures at all observed epochs indicate a surface magnetic field, with longitudinal magnetic field strengths varying between 1.0-3.2 G. Radial velocity variations from night to night modulate on a similar timescale to the longitudinal magnetic field measurements. These variations are therefore likely due to the rotational modulation of stellar active regions rather than the much longer timescale of the planetary orbit (Porb = 528 d). Both the longitudinal magnetic field measurements and radial velocity variations are consistent with a rotation period of 10 ± 2 days, which are also consistent with the measured chromospheric activity level of the star (′log R′HK = -4.64). Together, these quantities indicate a low inclination angle, i ∼ 18°. We present preliminary magnetic field maps of the star based on the above period and find a simple poloidal large-scale field. Chemical analyses of the star have revealed that it is likely to have undergone a barium-enrichment phase in its evolution because of a higher mass companion. Despite this, our study reveals that the star has a fairly typical activity level for its rotation period and spectral type. Future studies will enable us to explore the long-term evolution of the field, as well as to measure the stellar rotation period, with greater accuracy

Models of Star-Planet Magnetic Interaction

Magnetic interactions between a planet and its environment are known to lead to phenomena such as aurorae and shocks in the solar system. The large number of close-in exoplanets that were discovered triggered a renewed interest in magnetic interactions in star-planet systems. Multiple other magnetic effects were then unveiled, such as planet inflation or heating, planet migration, planetary material escape, and even modification of the host star properties. We review here the recent efforts in modelling and understanding magnetic interactions between stars and planets in the context of compact systems. We first provide simple estimates of the effects of magnetic interactions and then detail analytical and numerical models for different representative scenarii. We finally lay out a series of future developments that are needed today to better understand and constrain these fascinating interactions.Comment: 23 pages, 10 figures, accepted as a chapter in the Handbook of Exoplanet

Activity and magnetic field structure of the Sun-like planet-hosting star HD 1237

Journal Article© ESO, 2015. Reproduced with permission from Astronomy & Astrophysics, © ESO. This is the final published version of the work, which was originally published at: http://dx.doi.org/10.1051/0004-6361/201525771We analyse the magnetic activity characteristics of the planet-hosting Sun-like star, HD 1237, using HARPS spectro-polarimetric time-series data. We find evidence of rotational modulation of the magnetic longitudinal field measurements that is consistent with our ZDI analysis with a period of 7 days. We investigate the effect of customising the LSD mask to the line depths of the observed spectrum and find that it has a minimal effect on the shape of the extracted Stokes V profile but does result in a small increase in the S/N (~7%). We find that using a Milne-Eddington solution to describe the local line profile provides a better fit to the LSD profiles in this slowly rotating star, which also affects the recovered ZDI field distribution. We also introduce a fit-stopping criterion based on the information content (entropy) of the ZDI map solution set. The recovered magnetic field maps show a strong (+90 G) ring-like azimuthal field distribution and a complex radial field dominating at mid latitudes (~45 degrees). Similar magnetic field maps are recovered from data acquired five months apart. Future work will investigate how this surface magnetic field distribution affeccts the coronal magnetic field and extended environment around this planet-hosting star

Valoración de una Encuesta sobre Servicios de Atención Farmacéutica a Farmacéuticos de Alicante

INTRODUCCIÓN: Hay descritas barreras y facilitadores para implantar la AF. Algunos facilitadores podrían ser proporcionados desde los colegios profesionales. OBJETIVO: Conocer el interés de los farmacéuticos comunitarios alicantinos por los servicios de AF, y sus preferencias para implantar/mejorar éstos. MÉTODO: Estudio transversal realizado marzo-mayo de 2012, mediante un cuestionario anónimo a todos los colegiados ejercientes en OF, consensuado por la comisión de AF del COFA, disponible en la web colegial 70 días. Con preguntas referentes a su implantación, protocolización, registros, evaluación y ayudas sugeridas para su implantación/mejora.   RESULTADOS: Respondieron 19,9% de los colegiados ejercientes en FC, afirmando la mayoría querer mejorar su trabajo. Siguen protocolos para IF el 58%, automedicación un 60% y 33% para dispensación con receta. Realizan SFT un 23% y SPD 15%. La mayoría no registra las actuaciones, siendo 77% en IF, 70% en automedicación, 78% dispensación con receta, excepto SFT con 25%. Como formato de registro, se prefiere papel, excepto en SFT que son aplicaciones informáticas. La mayoría evalúa el resultado en ocasiones, solo un 8% lo hace siempre. En SFT lo evalúan siempre un 29%. Se prefiere un servicio de información frente a dudas, seguido de uno de apoyo a la implantación. CONCLUSIONES: Existe interés entre los farmacéuticos alicantinos por la AF. Sería deseable un mayor grado de implantación de estos servicios, existiendo gran recorrido de mejora en la protocolización, el registro y la evaluación de los resultados. Como herramientas para ello, destaca la solicitud al colegio de un servicio de información frente a dudas

Valoración de una Encuesta sobre Servicios de Atención Farmacéutica a Farmacéuticos de Alicante

INTRODUCCIÓN: Hay descritas barreras y facilitadores para implantar la AF. Algunos facilitadores podrían ser proporcionados desde los colegios profesionales. OBJETIVO: Conocer el interés de los farmacéuticos comunitarios alicantinos por los servicios de AF, y sus preferencias para implantar/mejorar éstos. MÉTODO: Estudio transversal realizado marzo-mayo de 2012, mediante un cuestionario anónimo a todos los colegiados ejercientes en OF, consensuado por la comisión de AF del COFA, disponible en la web colegial 70 días. Con preguntas referentes a su implantación, protocolización, registros, evaluación y ayudas sugeridas para su implantación/mejora.   RESULTADOS: Respondieron 19,9% de los colegiados ejercientes en FC, afirmando la mayoría querer mejorar su trabajo. Siguen protocolos para IF el 58%, automedicación un 60% y 33% para dispensación con receta. Realizan SFT un 23% y SPD 15%. La mayoría no registra las actuaciones, siendo 77% en IF, 70% en automedicación, 78% dispensación con receta, excepto SFT con 25%. Como formato de registro, se prefiere papel, excepto en SFT que son aplicaciones informáticas. La mayoría evalúa el resultado en ocasiones, solo un 8% lo hace siempre. En SFT lo evalúan siempre un 29%. Se prefiere un servicio de información frente a dudas, seguido de uno de apoyo a la implantación. CONCLUSIONES: Existe interés entre los farmacéuticos alicantinos por la AF. Sería deseable un mayor grado de implantación de estos servicios, existiendo gran recorrido de mejora en la protocolización, el registro y la evaluación de los resultados. Como herramientas para ello, destaca la solicitud al colegio de un servicio de información frente a dudas

Twenty-Five Years of Convoluted Health Reforms in Mexico

Núria Homedes and Antonio Ugalde discuss 25 years of reform to the Mexican health care system and argue that although costs and accessibility have increased, health inequities, efficiency, productivity, and quality of care have not improved

Statement complementing the EFSA Scientific Opinion on application (EFSA‐GMO‐UK‐2006‐34) for authorisation of food and feed containing, consisting of and produced from genetically modified maize 3272

Following a request from the European Commission, the GMO Panel assessed additional information related to the application for authorisation of food and feed containing, consisting of and produced from genetically modified (GM) maize 3272 (EFSA‐GMO‐UK‐2006‐34). The applicant conducted new agronomic, phenotypic and compositional analysis studies on maize 3272 and assessed the allergenic potential of AMY797E protein, addressing elements that remained inconclusive from previous EFSA opinion issued in 2013. The GMO Panel is of the opinion that the agronomic and phenotypic characteristics as well as forage and grain composition of maize 3272 do not give rise to food and feed safety, and nutritional concerns when compared to non‐GM maize. Considering the scope of this application and the characteristics of the trait introduced in this GM maize, the effect of processing and potential safety implications of specific food or feed products remain to be further investigated. Regarding the allergenic potential of AMY797E protein and considering all possible food and feed uses of maize 3272, the Panel concludes that the information provided does not fully address the concerns previously raised by the Panel in 2013. Owing to the nature and the knowledge available on this protein family, it is still unclear whether under specific circumstances the alpha‐amylase AMY797E has the capacity to sensitise certain individuals and to cause adverse effects. To further support the safety of specific products of maize 3272, the applicant provided thorough information relevant for the allergenicity assessment of dried distiller grains with solubles (DDGS), which is the main product of interest for importation into the EU. Having considered the information provided on this product, the Panel is of the opinion that under the specific conditions of use described by the applicant, DDGS produced from maize 3272 does not raise concerns when compared to DDGS from non‐GM maize