Mapping the spatial distribution of entanglement in optical lattices

We study the entangled states that can be generated using two species of atoms trapped in independently movable, two-dimensional optical lattices. We show that using two sets of measurements it is possible to measure a set of entanglement witness operators distributed over arbitrarily large regions of the lattice, and use these witnesses to produce two-dimensional plots of the entanglement content of these states. We also discuss the influence of noise on the states and on the witnesses, as well as connections to ongoing experiments.Comment: 2 figures, 6 page

Estándares de calidad en cirugía oncológica gástrica

Treball Final de Grau en Medicina. Codi: MD1158. Curs: 2016/2017El presente estudio trata de identificar los indicadores de calidad y establecer unos límites aceptables de calidad (AQL) en pacientes operados de adenocarcinoma gástrico. Método: Identificación de indicadores de calidad (QIs) mediante revisión sistemática de la literatura publicada. Determinación de los AQLs para cada indicador con intervalos de confianza de 99.8% y 95% por encima y por debajo del promedio ponderado para el tamaño de la muestra de las diferentes series examinadas, mediante el uso del control estadístico de procesos (SPC). Resultados: Se muestran los resultados correspondientes a la mortalidad total (7%), probabilidad de supervivencia general a los 5 años (44%), tasa de resecciones R0 (68%), fístula anastomótica (4%) e infección de la herida post quirúrgica (4%) para la cirugía abierta del adenocarcinoma gástrico de intención curativa. Conclusiones: Determinación de una serie de diferentes indicadores de calidad para el resultado quirúrgico del adenocarcinoma gástrico mediante el uso de una metodología estándar. Las cifras obtenidas son una referencia utilizable como objetivo a conseguir. Pueden emplearse también para la monitorización del control de calidad de las unidades dedicadas a tratar el adenocarcinoma gástrico.The aim of this study is to identify quality indicators and establish acceptable quality limits (AQLs) in gastric adenocarcinoma’s surgery. Method: Quality indicators (QIs) have been identified through systematic literature reviews for adenocarcinoma surgery. Determination of AQLs for each indicator with confidence intervals of 99.8% and 95% above and below the weighted average for the sample size of the different series examined, using statistical process control (SPC). Results: there are exposed the results corresponding to the total mortality (7%), 5 year’s probability of overall survival (44%), R0 resection rate(68%), anastomotic fistula (4%) and wound infection (4%) for open surgery of gastric adenocarcinoma of curative intention. Conclusions: determination of different quality indicators for the surgical outcome in the gastric adenocarcinoma using a standard methodology. The obtain records are a useful reference as an objective to be achieved. They can also be used for monitoring the quality control of units dedicated to treating gastric adenocarcinoma

Noves metodologies actives basades en les TIC i les TAC per ajudar a millorar l'atenció i l'aprenentatge de l'alumnat de cicles formatius de grau superior.

El present estudi planteja si una nova metodologia a les aules de formació professional, fent servir el llenguatge de les Tecnologies de la Informació i la Comunicació (TIC) que els alumnes tenen tan incorporades a la seva vida quotidiana, pot afavorir la seva atenció i el seu aprenentatge. Després d'analitzar les eines TIC de què disposem actualment els docents, s'ha dissenyat una sessió incorporant-ne algunes i s'han comparat els resultats obtinguts amb la impartició d'una sessió tradicional. Després, s'ha enquestat als alumnes participants per conèixer la seva opinió sobre les dues metodologies aplicades a les sessions i la seva predisposició a emprar les TIC a classe. Els qüestionaris emprats per avaluar les dues sessions han permès identificar millors resultats en la sessió que ha incorporat eines TIC. No obstant això, l'opinió dels alumnes sobre les eines emprades no ha estat del tot satisfactòria. Es valoren els beneficis d'incorporar eines TIC a les programacions de formació professional i es proposa una seqüència pedagògica millorada

Optimal Economic Schedule for a Network of Microgrids With Hybrid Energy Storage System Using Distributed Model Predictive Control

Artículo Open Access en el sitio web el editor. Pago por publicar en abierto.In this paper, an optimal procedure for the economic schedule of a network of interconnected microgrids with hybrid energy storage system is carried out through a control algorithm based on distributed model predictive control (DMPC). The algorithm is specifically designed according to the criterion of improving the cost function of each microgrid acting as a single system through the network mode operation. The algorithm allows maximum economical benefit of the microgrids, minimizing the degradation causes of each storage system, and fulfilling the different system constraints. In order to capture both continuous/discrete dynamics and switching between different operating conditions, the plant is modeled with the framework of mixed logic dynamic. The DMPC problem is solved with the use of mixed integer linear programming using a piecewise formulation, in order to linearize a mixed integer quadratic programming problem.Ministerio de Economía, Industria y Competitivadad DPI2016-78338-RComisión Europea 0076-AGERAR-6-

Seeing Majorana fermions in time-of-flight images of spinless fermions coupled by s-wave pairing

The Chern number, nu, as a topological invariant that identifies the winding of the ground state in the particle-hole space, is a definitive theoretical signature that determines whether a given superconducting system can support Majorana zero modes. Here we show that such a winding can be faithfully identified for any superconducting system (p-wave or s-wave with spin-orbit coupling) through a set of time-of-flight measurements, making it a diagnostic tool also in actual cold atom experiments. As an application, we specialize the measurement scheme for a chiral topological model of spinless fermions. The proposed model only requires the experimentally accessible s-wave pairing and staggered tunnelling that mimics spin-orbit coupling. By adiabatically connecting this model to Kitaev's honeycomb lattice model, we show that it gives rise to nu = \pm 1 phases, where vortices bind Majorana fermions, and nu=\pm 2 phases that emerge as the unique collective state of such vortices. Hence, the preparation of these phases and the detection of their Chern numbers provide an unambiguous signature for the presence of Majorana modes. Finally, we demonstrate that our detection procedure is resilient against most inaccuracies in experimental control parameters as well as finite temperature.Comment: 9+4 pages, 11 figures, expanded versio

Is urban-water sustainability possible? Concepts, implementation, and barriers to enhance Integrated Urban Water Management in Mexico City

Water scarcity and climate change events cause constraints in urban environments. Integrated Urban Water Management approaches have emerged to promote alternatives to urban water management and minimise such problems. These approaches have been facing reduced advances in been adopted. Literature has studied this phenomenon using Transition Theory. However, studies have barely focused on the cases when changes in the water systems are promoted by the actors of the existing dominant system (or incumbent-led transitions), while recognising the power and political dynamics in the developing world. This research addresses this gap by study two empirical projects in Mexico City that proposed a change in urban water management. A framework adapted from the Transition Theory was used to clarify power dynamics in the water system in Mexico City, especially the role of actors in maintaining practices or deliver power to sustainable alternatives, represented by urban experiments. Also, this research recognises that the water system in Mexico City had already suffered some adjustments responding to external pressures that led to the introduction of sustainable practices. However, more work in the system structure and other domains (such as transport and conservation or resource management) is needed to make a significant change and introduce integrated approaches properly. The main insights for this thesis are: (i) The recognition of the incumbents´ role in supporting alternative projects inconsistently as a response to regime´s external and internal pressures. (ii) Integrated approaches require a multi-regime integration. However, this is challenging due to the complexity of coordinating a large cohort of stakeholders that respond to reduce uncertainty and maintain diverse regimes´ visions, political-power structures and vested interest. (iii) Incumbents see multi-regime coordination as a risk, so they tend to compete and act in an antagonist manner to maintain resources and power, complicating socio-technical systems coordination. Finally, (iv) incumbent-led sustainable projects require a strict development design and evaluation fostering internal continuity, while external supervision is also required. Hence, the necessity of empowering external actors to the regime. The studied cases evidenced that sustainable projects represent another actor competing for resources, but struggles emerge in different scales and systems, recognising that a strict policy design from several domains is needed. Overall, this research shows that water management is difficult to modify due to the inherent complexity of the interconnected systems rather than a lack of will to change them

Hall response of interacting bosonic atoms in strong gauge fields: from condensed to FQH states

Interacting bosonic atoms under strong gauge fields undergo a series of phase transitions that take the cloud from a simple Bose-Einstein condensate all the way to a family of fractional-quantum-Hall-type states [M. Popp, B. Paredes, and J. I. Cirac, Phys. Rev. A 70, 053612 (2004)]. In this work we demonstrate that the Hall response of the atoms can be used to locate the phase transitions and characterize the ground state of the many-body state. Moreover, the same response function reveals within some regions of the parameter space, the structure of the spectrum and the allowed transitions to excited states. We verify numerically these ideas using exact diagonalization for a small number of atoms, and provide an experimental protocol to implement the gauge fields and probe the linear response using a periodically driven optical lattice. Finally, we discuss our theoretical results in relation to recent experiments with condensates in artificial magnetic fields [ L. J. LeBlanc, K. Jimenez-Garcia, R. A. Williams, M. C. Beeler, A. R. Perry, W. D. Phillips, and I. B. Spielman, Proc. Natl. Acad. Sci. USA 109, 10811 (2012)] and we analyze the role played by vortex states in the Hall response.Comment: 10 pages, 7 figure

Use Case Oriented Medical Visual Information Retrieval & System Evaluation

Large amounts of medical visual data are produced daily in hospitals, while new imaging techniques continue to emerge. In addition, many images are made available continuously via publications in the scientific literature and can also be valuable for clinical routine, research and education. Information retrieval systems are useful tools to provide access to the biomedical literature and fulfil the information needs of medical professionals. The tools developed in this thesis can potentially help clinicians make decisions about difficult diagnoses via a case-based retrieval system based on a use case associated with a specific evaluation task. This system retrieves articles from the biomedical literature when querying with a case description and attached images. This thesis proposes a multimodal approach for medical case-based retrieval with focus on the integration of visual information connected to text. Furthermore, the ImageCLEFmed evaluation campaign was organised during this thesis promoting medical retrieval system evaluation

Spin Glass and ferromagnetism in disordered Kondo lattice

The competition among spin glass (SG), ferromagnetism and Kondo effect has been analysed in a Kondo lattice model where the inter-site coupling $J_{ij}$ between the localized magnetic moments is given by a generalized Mattis model \cite{Mattis} which represents an interpolation between ferromagnetism and a highly disordered spin glass. Functional integral techniques with of Grassmann fields has been used to obtain the partition function. The static approximation and the replica symmetric ansatz has also been used. The solution of the problem is presented as a phase diagram temperature $T$ {\it versus} $J_K$ (the strength of the intra-site interaction). If $J_K$ is small, for decreasing temperature there is a second order transition from a paramagnetic to a spin glass phase For lower temperatures, a first order transition appears where solutions for the spin glass order parameter and the local magnetizations are simultaneously non zero. For very low temperatures, the local magnetizations becomes thermodinamically stables. For high $J_K$, the Kondo state is dominating. These results could be helpful to clarify the experimental situation of $CeNi_{1-x}Cu_{x}$.Comment: 4 pages, 1 figure, accept to be published in Physica

El fanzine autobiográfico. “Manías, rarezas y obsesiones”

Aplicar la ilustracion a una obra de expresion artstca independiente como lo es el fanzine, que permite a los artstas noveles llegar a una gran cantdad de publico con el menor gasto posible, y darla a conocer mediante vias de promocion que no requieren de recursos economicos, es el objetvo de este Trabajo Final de Grado. El resultado fnal es un fanzine autobiografco o “confesional” creado a partr de apuntes tomados de la propia vida real que funciona como primer volumen de la serie “Lo PETAMOS”, disponible bajo pedido online en Tictail o compra en la novena edicion del festval de autoedicion Tenderete. La tematca del fanzine responde al ttulo de este primer volumen: “Manias, rarezas y obsesiones”. Se encuentra dentro del genero de Comic de Autor, su coste ha sido menor a 100 euros y la estetca es de apariencia rapida y algo naif pero a la vez muy cuidada.The applicaton of illustraton technique to a piece of independent artstc expression as it is the fanzine, which allows emerging artst a bigger approach the public with the smallest level of investment possible, as well as to promote it through channels that do not require a big economic investment, is the main goal of this dissertaton. The fnal result is an autobiographic or “confessional” fanzine based on notes taken out of real life experiences that works out as the frst volume of the series “LO PETAMOS”, available under online request through Tictail or on sale in the ninth editon of the selfpublishing festval Tenderete. The theme of the fanzine is equal to the ttle of this frst volume: “Manias, rerezas y obsesiones”. It is found inside the Independent Comics genere, the prize has been kept under 100 euros and the estethic appeals fast and naif but at the same tme you can apreciate a delicate accomplishment.Garcia Garcia, A. (2014). El fanzine autobiográfico. “Manías, rarezas y obsesiones”. http://hdl.handle.net/10251/49943.Archivo delegad