2D-Drop model applied to the calculation of step formation energies on a (111) substrate

A model is presented for obtaining the step formation energy for metallic islands on (111) surfaces from Monte Carlo simulations. This model is applied to homo (Cu/Cu(111), Ag/Ag(111)) and heteroepitaxy (Ag/Pt(111)) systems. The embedded atom method is used to represent the interaction between the particles of the system, but any other type of potential could be used as well. The formulation can also be employed to consider the case of other single crystal surfaces, since the higher barriers for atom motion on other surfaces are not a hindrance for the simulation scheme proposed.Comment: 12 pages, LaTeX2e, 2 included EPS figures, submitted to Surface Science Subj-clas

Automation of Image Analysis Software for Real-Time Oxygenation Imaging of Wounds

Preliminary work has shown that measuring tissue oxygenation in diabetic foot ulcers (DFU) using Near Infrared Spectroscopy (NIRS) using a Near Infrared Optical Scanner (NIROS) has promise in providing clinicians with subclinical physiological information on wound healing. This physiological information includes hemoglobin-based (oxy-hemoglobin, deoxy-hemoglobin, total hemoglobin, and oxygen saturation) concentration maps that undergo contrast analysis, image segmentation, image coregistration, measurements of wound areas, and statistical analysis. Currently, these methods have been implemented separately in MATLAB, requiring a time-consuming image analysis process. Herein, the objective of this project is to consolidate the various steps of image analysis into a single automated, user-friendly, graphical interface for efficient, real-time data analysis in the clinic. Consolidation and automation of the image analysis process can allow real-time assessment of wound healing status, apart from real-time imaging capabilities of the NIROS system. NIROS has the potential to complement the gold-standard clinical visual assessment of DFUs by providing supplementary physiological information on wound healing, and thus guiding treatment, with the possibility of improving patient outcomes

Super-Nernstian Shifts of Interfacial Proton-Coupled Electron Transfers : Origin and Effect of Noncovalent Interactions

The support of the University of Aberdeen is gratefully acknowledged. C.W. acknowledges a summer studentship from the Carnegie Trust for the Universities of Scotland. E.P.M.L. acknowledges SeCYT (Universidad Nacional de Cordoba), ́ CONICET- PIP 11220110100992, Program BID (PICT 2012-2324), and PME 2006-01581 for financial support.Peer reviewedPostprin

Simulated Annealing aplicado al diseno de lamparas de LED’s para el alumbrado publico

110 p.El ahorro de energía es un tema de cada vez mayor importancia en el mundo. Uno de los esfuerzos en este sentido es el diseño eficiente de artefactos de iluminación que permitan ahorrar energía. Las características de los componentes electrónicos de iluminación de estado sólido (SSL) tienen cada día mejores niveles de eficiencia sin aumentar el consumo eléctrico. Es necesario adaptar geométricamente los componentes de las luminarias SSL que se diseñen para que la luz emitida sea completamente aprovechada. En este proyecto se ha implementado una aplicación capaz de calcular el espejo que refleja los rayos de luz emitidos por la fuente, dirigiéndolos en su totalidad hacia el área definida por el usuario. Con esto se tendrá un espejo particular para cada tipo de iluminación, dependiendo de las condiciones que lo definan. Para lograr este objetivo se utilizó el algoritmo metaheurístico de Simulated Annealing, tomando como restricciones las características de los SSL y las necesidades de iluminación especificadas por el usuario./ ABSTRACT: Energy saving is an issue with a growing importance in our world. One of the goals is to efficiently design illumination artifacts that allow us to save as much energy as possible. The electronic components of solid state lighting (SSL) feature now better efficiency levels, without raising the electric consumption. It is necessary to geometrically adapt the components of the lighting devices, so that the outgoing light is as efficient as possible and used in its totality. This project, implements an application capable to calculate the light mirror that reflects the light rays emitted by the source, redirecting them totally to the target area defined by the user. This will allow us to have a single mirror for each illumination type, depending on the environment conditions. To achieve this, is used the Simulated Annealing metaheuristic algorithm, taking as restrictions the characteristics of the SSL and lighting requirements specified by the user. The application is also capable of showing the solution in a three-dimension model so that the user can see the proposed design for the system