UTILIDAD DE LA ECOGRAFÍA EN EL DIAGNÓSTICO DEL SÍNDROME DE TÚNEL DEL CARPO EN PACIENTES DE ORTOPEDIA DEL HEALFM

El interés de este trabajo se centró en verificar la utilidad del examen de ecografía del nervio mediano en los pacientes con sospechas clínicas de Síndrome de Túnel del Carpo, en relación al resultado de electromiografía en el Hospital Escuela Antonio Lenín Fonseca Martínez de septiembre a diciembre 2016. Para este fin se hizo un estudio observacional, descriptivo, correlacional, retroprospectivo y analítico de enfoque mixto. Se estudiaron las características sociodemográficas, clínicas y el grado de severidad; así como las mediciones ecográficas del área del nervio mediano, grosor y distancia del retináculo, el aplanamiento (relación eje mayor/eje corto) y los cambios ecográficos del nervio mediano en estos pacientes y la correlación existente entre los hallazgos ecográficos y los resultados de la electromiografía. Los resultados evidenciaron que el género predominante fue el femenino, actividad amas de casa, la edad promedio 54 años, y la mayoría con actividad laboral manual severa. El área promedio del nervio mediano, fue de 11,4mm2. El aplanamiento del nervio mediano fue de 3,3 como promedio. La disminución de la ecogenicidad se encontró en el 66%. La ecografía resulto ser un estudio sencillo, fácil de realizar y de buena utilidad, con algunas mediciones de buena concordancia en contraste con la electromiografía. Esto se comprobó dado que existe muy buena concordancia (71,4%, k=0,74, p=0,000); entre la electromiografía y la medición del área del nervio mediano, así como entre la EMG y la medición de la distancia del retináculo flexor (71,4%, k=0,741, p=0,000). De igual manera se demostró muy buena concordancia al comparar la disminución de la ecogenicidad (57,1%, Phi=0,447, p= 0,04)

Frequency doubling of femtosecond pulses in walk-off compensated npp

Summary form only given. N-(4-nitrophenyl)-L-prolinol (NPP) is an organic molecular crystal developped by molecular engineering, that exhibits one of the highest phase-matchable second-order susceptibilities reported so far in the near-infrared spectral range (d/sub eff//spl ap/56 pm/V). However, the large spatial and temporal walk-off existing in NPP can limit severely the usefulness of the material away from the noncritical phase-matching (ncpm) wavelength and for shorter pulses. Here we show that subpicosecond pulses can be efficiently frequency-doubled and mixed in NPP with moderate pump intensities, by employing tilted pulse techniques. These techniques make use of the large Poynting vector walk-off exhibited by NPP crystals outside the ncpm. Such techniques are based on the diffraction of the input pump wave by a grating so that each spectral component is dispersed in a different direction, thus the resulting signal is a tilted pulse.Peer ReviewedPostprint (published version

Waste glass in the geopolymer preparation. Mechanical and microstructural characterisation

Alkali activated materials have a variety of niche applications (other than as a large-scale civil infrastructure material) in which alkali-activated binders and concretes have shown potential for commercial-scale development. The majority of these applications have not yet seen large-scale alkali activated materials utilisation, moreover, there have been at least pilot-scale or demonstration projects in different areas and each provides scope for future development and potentially profitable advances in science and technology. This paper explores the feasibility of generating geopolymers from fly ash using waste glass as an alkaline activator (waterglass family). The mechanical properties of the cementitious geopolymers obtained by alkali-activating fly ash with three solutions: sodium hydroxide 8 M, sodium hydroxide 10 M þ 15% waterglass and sodium hydroxide 10 M þ 15 g of waste glass were determined, along with their microstructural characteristics using Fourier Transform Infrared Spectroscopy, X-Ray Diffraction, Mercury Intrusion Porosimetry, Mass Nuclear Magnetic Resonance, Scanning Electron Microscopy and Back Scattering Electron Microscopy. The main reaction product in all the systems studied was the alkaline aluminosilicate hydrate gel to which geopolymers owe their mechanical properties. The gel formed when the system contained an extra source of silicon was shown to prompt compositional differences, while the degree of reaction, microstructure and Si/Al and Na/Al ratios were very similar in the former two systems. Waste glass proved to be an effective alkaline activator in geopolymer preparation.The present research was funded by the Spanish Ministry of Economy and Competitiveness under project BIA2010-15516.Publicad

Use of glass waste as an activator in the preparation of alkali-activated slag. Mechanical strength and paste characterisation

The alkaline activation of aluminosilicates yields alkaline cements, eco-efficient alternatives to ordinary Portland cements. Alkaline cements and concretes exhibit highest strength and longest durability when activated with a solution of alkaline silicate hydrates (waterglass). To obtain these alkaline silicates, however, an aqueous solution of the proper proportion of carbonate and silica salts must be heated to temperatures of around 1300 °C. The present paper explores the feasibility of using urban and industrial glass waste as a potential alkaline activator for blast furnace slag (AAS). AAS pastes were prepared with three activators: waterglass, a NaOH/Na2CO3 mix and the solutions resulting from dissolving glass waste in NaOH/Na2CO3. Mechanical, mineralogical (XRD, FTIR) and microstructural (porosimetry, NMR and SEM/EDX) trials were conducted to characterise the pastes obtained. The findings proved the feasibility of using glass waste to alkali activate slag. Treating glass waste with NaOH/Na2CO3 (pH = 13.6) favours the partial dissolution of the Si in the glass into its most reactive monomeric form. The solutions resulting from the treatment of glass waste act as alkaline activators, partially dissolving vitreous blast furnace slag. The composition and microstructure of the reaction products identified in the two types of paste were similar. Strength and microstructural development in the pastes activated with glass waste were also comparable to the parameters observed in AAS pastes prepared with conventional activators.The present research was funded by the Ministry of Economy and Competitiveness under project BIA2010-1551

Star formation in low density HI gas around the Elliptical Galaxy NGC2865

Interacting galaxies surrounded by HI tidal debris are ideal sites for the study of young clusters and tidal galaxy formation. The process that triggers star formation in the low-density environments outside galaxies is still an open question. New clusters and galaxies of tidal origin are expected to have high metallicities for their luminosities. Spectroscopy of such objects is, however, at the limit of what can be done with existing 8-10m class telescopes, which has prevented statistical studies of these objects. NGC2865 is an UV-bright merging elliptical galaxy with shells and extended HI tails. The regions observed in this work were previously detected using multi-slit imaging spectroscopy. We obtain new multislit spectroscopy of six young star-forming regions around NGC2865, to determine their redshifts and metallicities. The six emission-line regions are located 16-40 kpc from NGC2865 and they have similar redshifts. They have ages of ~10Myears and an average metallicity of 12+log(O/H) ~ 8.6, suggesting a tidal origin for the regions. It is noted that they coincide with an extended HI tail, which has projected density of N$_{HI}$ < 10$^{19}$ cm$^{-2}$, and displays a low surface brightness counterpart. These regions may represent the youngest of the three populations of star clusters already identified in NGC2865. The high, nearly-solar, oxygen abundances found for the six regions in the vicinity of NGC2865 suggest that they were formed by pre-enriched material from the parent galaxy, from gas removed during the last major merger. Given the mass and the location of the HII regions, we can speculate that these young star-forming regions are potential precursors of globular clusters that will be part of the halo of NGC2865 in the future. Our result supports the use of the multi-slit imaging spectroscopy as a useful tool for finding nearly-formed stellar systems around galaxies.Comment: 7 pages, 2 figures accepted in A&

Autoestereoscopía en dispositivos móviles para facilitar el aprendizaje

[EN] Autostereoscopy is a technique for three-dimensional visualization that allows the user to perceive the sensation of depth of objects without needing to wear glasses or other devices. The major effort has focused on screens of 15 inches or greater. There are very few mobile devices that incorporate autoestereoscopía. In this thesis, we used a mobile autostereoscopic, LG Optimus 3D. Three-dimensional models are important when learning content is very difficult to acquire from 2D images or other traditional learning methods. If three-dimensional models are joined by three-dimensional visualization, we hypothesize that this binding facilitates learning. This thesis focuses on the dental learning. Specifically, it has been developed and validated an application to learning the dental morphology. The application has been validated with students of dental specialties[ES] La autoestereoscopía es una técnica de visualización tridimensional que permite al usuario percibir la sensación de profundidad de los objetos sin necesitad de llevar gafas o cualquier otro dispositivos. El esfuerzo mayoritario se ha centrado en pantallas de 15 pulgadas o superiores. Existen muy pocos dispositivos móviles que incorporen autoestereoscopía. En esta tesina, se ha utilizado un dispositivo móvil autoestereoscópico, LG Optimus 3D. Los modelos tridimensionales son importantes cuando el contenido de aprendizaje es muy difícil de adquirir a partir de imágenes 2D u otros métodos tradicionales de aprendizaje. Si a los modelos tridimensionales se les une la visualización tridimensional, nuestra hipótesis es que esta unión facilita el aprendizaje. La presente tesina se centra en el aprendizaje dental. Concretamente, se ha desarrollado y validado una aplicación que permite el aprendizaje de la morfología dental. La aplicación se ha validado con estudiantes de especialidades dentalesCarrasco Torres, C. (2014). Autoestereoscopía en dispositivos móviles para facilitar el aprendizaje. http://hdl.handle.net/10251/49125Archivo delegad