Single atom edge-like states via quantum interference

We demonstrate how quantum interference may lead to the appearance of robust edge-like states of a single ultracold atom in a two-dimensional optical ribbon. We show that these states can be engineered either within the manifold of local ground states of the sites forming the ribbon, or of states carrying one unit of angular momentum. In the former case, we show that the implementation of edge-like states can be extended to other geometries, such as tilted square lattices. In the latter case, we suggest to use the winding number associated to the angular momentum as a synthetic dimension.Comment: 5 pages, 5 figure

Evolución tecto-sedimentaria olugo-miocénica del SO de la fosa de Ciudad Rodrigo. Salamanca

Durante el Oligoceno-Mioceno Inferior, la sedimentación en el borde suroeste de la Fosa de Ciudad Rodrigo estuvo controlada por un complejo sistema de fracturas que rejugaron independientemente en las distintas fases tectónicas intraterciarias,. cu-y a actuación se ha deducido a partir de un exhaustivo control de la estratigrafía de la región. Para ello, fue necesario definir una unidad litoestratigráfica (Formación Arcosas de la Alamedilla) y dividirla en cinco tramos reconocibles en el área de trabajo. El estudio sedimentológico de cada uno de los tramos (análisis granulométricos, minerales pesados, paleocorrientes, análisis secuencial y de facies etc.) permitió deducir el tipo de área fuente que se estaba desmantelando en cada momento y su localización geográfica. Al relacionar los resultados estratigráficos, sedimentológicos y tectónicos se observa que cada tramo se deposita en respuesta a una fase tectónica determinada y que la arquitectura fluvial resultante está controlada por la geometría de la cuenca sedimentaria existente en cada momento y el carácter estacionaldel clima

Evolución tecto-sedimentaria olugo-miocénica del SO de la fosa de Ciudad Rodrigo. Salamanca

Durante el Oligoceno-Mioceno Inferior, la sedimentación en el borde suroeste de la Fosa de Ciudad Rodrigo estuvo controlada por un complejo sistema de fracturas que rejugaron independientemente en las distintas fases tectónicas intraterciarias,. cu-y a actuación se ha deducido a partir de un exhaustivo control de la estratigrafía de la región. Para ello, fue necesario definir una unidad litoestratigráfica (Formación Arcosas de la Alamedilla) y dividirla en cinco tramos reconocibles en el área de trabajo. El estudio sedimentológico de cada uno de los tramos (análisis granulométricos, minerales pesados, paleocorrientes, análisis secuencial y de facies etc.) permitió deducir el tipo de área fuente que se estaba desmantelando en cada momento y su localización geográfica. Al relacionar los resultados estratigráficos, sedimentológicos y tectónicos se observa que cada tramo se deposita en respuesta a una fase tectónica determinada y que la arquitectura fluvial resultante está controlada por la geometría de la cuenca sedimentaria existente en cada momento y el carácter estacionaldel clima

A large sample analysis of European rivers on seasonal river flow correlation and its physical drivers

The geophysical and hydrological processes governing river flow formation exhibit persistence at several timescales, which may manifest itself with the presence of positive seasonal correlation of streamflow at several different time lags. We investigate here how persistence propagates along subsequent seasons and affects low and high flows. We define the high-flow season (HFS) and the low-flow season (LFS) as the 3-month and the 1-month periods which usually exhibit the higher and lower river flows, respectively. A dataset of 224 rivers from six European countries spanning more than 50 years of daily flow data is exploited. We compute the lagged seasonal correlation between selected river flow signatures, in HFS and LFS, and the average river flow in the antecedent months. Signatures are peak and average river flow for HFS and LFS, respectively. We investigate the links between seasonal streamflow correlation and various physiographic catchment characteristics and hydro-climatic properties. We find persistence to be more intense for LFS signatures than HFS. To exploit the seasonal correlation in the frequency estimation of high and low flows, we fit a bi-variate meta-Gaussian probability distribution to the selected flow signatures and average flow in the antecedent months in order to condition the distribution of high and low flows in the HFS and LFS, respectively, upon river flow observations in the previous months. The benefit of the suggested methodology is demonstrated by updating the frequency distribution of high and low flows one season in advance in a real-world case. Our findings suggest that there is a traceable physical basis for river memory which, in turn, can be statistically assimilated into high- and low-flow frequency estimation to reduce uncertainty and improve predictions for technical purposes

The role of peptides in the design of electrochemical biosensors for clinical diagnostics

Peptides represent a promising class of biorecognition elements that can be coupled to electrochemical transducers. The benefits lie mainly in their stability and selectivity toward a target analyte. Furthermore, they can be synthesized rather easily and modified with specific functional groups, thus making them suitable for the development of novel architectures for biosensing platforms, as well as alternative labelling tools. Peptides have also been proposed as antibiofouling agents. Indeed, biofouling caused by the accumulation of biomolecules on electrode surfaces is one of the major issues and challenges to be addressed in the practical application of electrochemical biosensors. In this review, we summarise trends from the last three years in the design and development of electrochemical biosensors using synthetic peptides. The different roles of peptides in the design of electrochemical biosensors are described. The main procedures of selection and synthesis are discussed. Selected applications in clinical diagnostics are also described

The role of peptides in the design of electrochemical biosensors for clinical diagnostics

Peptides represent a promising class of biorecognition elements that can be coupled to electrochemical transducers. The benefits lie mainly in their stability and selectivity toward a target analyte. Furthermore, they can be synthesized rather easily and modified with specific functional groups, thus making them suitable for the development of novel architectures for biosensing platforms, as well as alternative labelling tools. Peptides have also been proposed as antibiofouling agents. Indeed, biofouling caused by the accumulation of biomolecules on electrode surfaces is one of the major issues and challenges to be addressed in the practical application of electrochemical biosensors. In this review, we summarise trends from the last three years in the design and development of electrochemical biosensors using synthetic peptides. The different roles of peptides in the design of electrochemical biosensors are described. The main procedures of selection and synthesis are discussed. Selected applications in clinical diagnostics are also described

Technology to enable new paradigms of teaching/learning in mathematics: the digital interactive storytelling case

This paper concerns the design and implementation of a particular methodology for mathematics teaching/learning which exploits an interactive and immersive metaphor of storytelling. This research aims to promote processes such as inquiring, conjecturing, formalizing, proving in mathematics, and to investigate which is the best way to organize ICT tools to achieve that purpose. We also report the findings of an ongoing experimentation at the K12 school level