Quasi-steady vortical structures in vertically vibrating soap �lms

An analysis of the quasi-steady streaming of the liquid in a vertically vibrated horizontal soap film is reported. The air around the soap film is seen to play a variety of roles: it transmits normal and tangential oscillatory stresses to the film, damps out Marangoni waves, and forces non-oscillatory deflection of the film and tangential motion of the liquid. Non-oscillatory volume forcing originating inside the liquid is also analysed. This forcing dominates the quasi-steady streaming when the excitation frequency is close to the eigenfrequency of a Marangoni mode of the soap film, while both volume forcing in the liquid and surface forcing of the gas on the liquid are important when no Marangoni mode resonates. Different manners by which the combined forcings can induce quasi-steady streaming motion are discussed and some numerical simulations of the quasi-steady liquid flow are presented

Discovering Rehabilitation trends in Spain: A bibliometric analysis

The main purpose of this study is to offer an overview of the rehabilitation research area in Spain from 1970 to 2018 through a bibliometric analysis. Analysis of performance and a co-word science mapping analysis were conducted to highlight the topics covered. The software tool SciMAT was used to analyse the themes concerning their performance and impact measures. A total of 3,564 documents from the Web of Science were retrieved. Univ Deusto, Univ Rey Juan Carlos and Basque Foundation for Science are the institutions with highest relative priority. The most important research themes are IntellectualDisability, Neck-Pain and Pain

Teorías probabilistas sobre coeficientes de seguridad

Teorías probabilistas sobre coeficientes de segurida

Técnicas de producción en molde de metales y plásticos

RESUMEN: El proyecto final de carrera “Fabricación en moldes de metales y polímeros” consiste en la recopilación de los diferentes procesos productivos que existen hoy en día para la fabricación de piezas tanto en metal como en plástico. Estos métodos se han separado en dos grandes bloques, el primero de ellos para la fabricación de metales, y el segundo para la fabricación de plásticos. Dentro del primer grupo se explica detalladamente y con ejemplos gráficos, en qué consisten los siguientes procesos: - Moldeo a la cera perdida. - Fundición en molde de arena. - Moldeo en cáscara o concha. - Fundición en molde consumible. - Fundición en molde de yeso. - Moldeo en vacio. - Moldeo en coquilla. - Fundición a presión. - Fundición centrifuga. En cada uno de ellos se ha querido tratar los mismos puntos, para que puedan compararse entre ellos y facilitar así el proceso de aprendizaje. Estos puntos a tratar en cada uno de ellos son: antecedentes históricos, molde, proceso, ventajas y desventajas y aplicaciones. Dentro del segundo grupo se explica detalladamente y con ejemplos gráficos en qué consiste cada uno de los siguientes procesos: - Moldeo de plásticos por inyección. - Moldeo de plásticos por extrusión de polímero. - Moldeo de plásticos por soplado. - Moldeo de plásticos por compresión. - Moldeo de plásticos por transferencia. - Moldeo de plásticos por termoconformado. La explicación de estos procesos es algo más extensa, ya que existe una mayor complejidad y son más modernos que en el caso de los metales

Election of Water Resources Management Entity Using a Multi-Criteria Decision (MCD) Method in Salta Province (Argentine)

At present, the water resources are a strategic element each time more necessary and limited becoming a source of conflicts. For that, it is fundamental to create an independent and competent entity with good reputation and social acceptation. This entity must be able to obtain, store and process all data dispersed in different entities creating a network for these purposes. Finally, it must be able to organize different branches between the government and the final users. Using one of the wellknown Multicriteria Decision Methods(MCDM) with several realistic alternatives and several criteria identified in expert seminars in Salta and Madrid, we have obtained hopeful results and more recently new modifications introduced have generated better results

Dynamical and temporal characterization of the total ozone column over Spain

As the ozone is one of the most relevant variables in the climate system, to get further in its long-term characterization is a critical issue. In this study, measurements of total ozone column (TOC) from five well-calibrated Brewer spectrophotometers placed in the Iberian Peninsula are analyzed. The temporal trend rate for TOC is +9.3 DU per decade for the period 1993–2012 in Central Iberian Peninsula. However, the low TOC levels during 2011 and 2012 over the study region notably reduce this rate. Empirical linear relationships are established between TOC and pressure, height, and temperature of the tropopause. The linear fits showed seasonal and latitudinal dependence, with stronger relationships during winter and spring. Events with the presence of a double tropopause (DT) are proved to be characteristic of the study region. The decrease in TOC levels when these anomalous events occur is quantified around 10 % in winter and spring with respect to the usual cases with a single tropopause. The total weight of the DT events with respect to the annual values is about 20 %, with a negligible occurrence in summer and autumn and being latitudinal-dependent. The North Atlantic Oscillation (NAO) index explains 30 % of the total ozone variability in winter. The DT events are found to be more frequent during phases with positive NAO.This work was partially supported the Ministerio de Ciencia e Innovación through project CGL2011-29921-C02-01

3D-form metrology of arbitrary optical surfaces by absorption in fluids

We present an imaging technique for the 3D-form metrology of optical surfaces. It is based on the optical absorption in fluids situated between the surface and a reference. An improved setup with a bi-chromatic light source is fundamental to obtain reliable topographic maps. It is able to measure any surface finish (rough or polished), form and slope and independently of scale. We present results focused on flat and spherical optical surfaces, arrays of lenses and with different surface finish (rough-polished). We achieve form accuracies from several nanometers to sub-lambda for sag departures from tens to hundred of microns. Therefore, it seems suitable for the quality control in the production of precision aspheric, freeform lenses and other complex shapes on transparent substrates, independently of the surface finish

Additional Physical Interventions to Conventional Physical Therapy in Parkinson’s Disease: A Systematic Review and Meta-Analysis of Randomized Clinical Trials

Parkinson's disease (PD) represents the second most common neurodegenerative disease. Currently, conventional physical therapy is complemented by additional physical interventions with recreational components, improving different motor conditions in people with PD. This review aims to evaluate the effectiveness of additional physical interventions to conventional physical therapy in Parkinson's disease. A systematic review and meta-analysis of randomized controlled trials were performed. The literature search was conducted in PubMed, Physiotherapy Evidence Database (PEDro), Scopus, SciELO and Web of Science. The PEDro scale was used to evaluate the methodological quality of the studies. A total of 11 randomized controlled trials were included in this review. Five of them contributed information to the meta-analysis. The statistical analysis showed favorable results for dance-based therapy in motor balance: (Timed Up and Go: standardized mean difference (SMD) = −1.16; 95% Confidence Interval (CI):(−2.30 to −0.03); Berg Balance Scale: SMD = 4.05; 95%CI:(1.34 to 6.75)). Aquatic interventions showed favorable results in balance confidence (Activities-Specific Balance Confidence: SMD=10.10; 95%CI:(2.27 to 17.93)). The results obtained in this review highlight the potential benefit of dance-based therapy in functional balance for people with Parkinson's disease, recommending its incorporation in clinical practice. Nonetheless, many aspects require clarification through further research and high-quality studies on this subject

Vigilancia paramétrica de la bilinealidad de transmisores de presión por análisis de ruido

El objetivo del presente trabajo es detectar la no linealidad asociada al comportamiento de un transmisor de presión capacitivo tipo Rosemount, cuando éste sufre pérdidas de aceite. La metodología propuesta consiste en suponer un comportamiento dinámico bilineal. Se simula la respuesta tanto del transmisor como de su línea sensora a una excitación de tipo ruido blanco y se trata la señal de medida aplicando modelos autorregresivos univariantes. Se plantea la simulación introduciendo el empleo de dos familias de coeficientes autorregresivos para reproducir la bilinealidad, no considerando la ecuación estocástica asociada a la excitación por ruido blanco. A partir de los resultados se ha definido un índice de vigilancia paramétrica para complementar la medida del tiempo de respuesta del sensor, ya que dicho tiempo no es la magnitud adecuada para detectar la bilinealidad

Scientific knowledge and conservation policies : interrelationships in the Spanish livestock autochthonous endangered breeds

El objetivo del estudio fue analizar las relaciones entre el conocimiento científico y los principales factores que determinan el grado de amenaza de las razas autóctonas españolas en peligro de extinción. Se utilizaron los datos oficiales del conjunto de razas españolas en peligro de extinción durante el período 2009-2013, y la producción científica y divulgativa de cada raza, recopilada a partir de Web of Science y Google para el período 1950-2012. Las razas fueron clasificadas según su riesgo de extinción con base en criterios demográficos durante el período 2009-2013. Los resultados han mostrado que el riesgo de extinción es elevado en más de la mitad de las razas, moderado en el 12,4% y crítico en el 36,1%. Los mayores niveles de riesgo correspondieron a razas concentradas en pequeñas áreas, con poblaciones y rebaños de menor tamaño, y reconocimiento oficial más reciente. La producción científica en el área de genética ha sido significativamente superior en las razas con mayor riesgo de extinción, mientras que los aspectos productivos y productos han sido más estudiados en las razas con menor riesgo de extinción. La divulgación de aspectos zootécnicos y sistemas de producción, producciones y productos ha sido significativamente mayor en las situaciones de menor riesgo de extinción. Por todo ello, se recomienda que las políticas de conservación concentren sus apoyos en una fase inicial relativa al estudio y caracterización racial basada en aspectos genéticos y una segunda fase centrada en el incremento del conocimiento y divulgación de las características productivas y de los sistemas de producción.The aim of this study was to analyse the progress and current status of endangered autochthonous Spanish breeds exploring relationships between the main factors that determine the degree of endangered and the scientific and technical production related to the breed. The status of each breed was determined from official data published by Ministry of Agriculture during 2009-2013. The scientific and disclosure production related to each breed was collected from Web of Science and Google for 1950-2012. Each breed was classified according to its risk of extinction, based on demographic criteria and the annual growth rate of the population during 2009-2013. Results showed the risk of extinction was high in approximately the half of breeds, intermediate in 12.4% and very high in 36.1%. The highest levels of extinction risk corresponded to breed with recent official recognition and spread in small areas, with reduced population and herds of small size. Scientific literature on genetics has been significantly higher in breeds at greatest risk of extinction, while productive issues and products have been significantly studied most intensively in breeds with less risk of extinction. The disclosure literature on zootechnical issues and production systems has been significantly higher in breeds at lower risk of extinction. Therefore, it is recommended conservation policies focus, in a first stage, on genetic aspects and breed features, and secondly on productive issues and production systems.Fil: Perea, José. Universidad de Córdoba (España)Fil: Barba, Cecilio. Universidad de Córdoba (España)Fil: Luque, Manuel. Federación Española de Asociaciones de Ganado SelectoFil: González, Ana. Universidad de Córdoba (España)Fil: Angón, Elena. Universidad de Córdoba (España)Fil: García, Antón. Universidad de Córdoba (España