Application of digital holographic interferometry to pressure measurements of symmetric, supercritical and circulation-control airfoils in transonic flow fields

Six airfoil interferograms were evaluated using a semiautomatic image-processor system which digitizes, segments, and extracts the fringe coordinates along a polygonal line. The resulting fringe order function was converted into density and pressure distributions and a comparison was made with pressure transducer data at the same wind tunnel test conditions. Three airfoil shapes were used in the evaluation to test the capabilities of the image processor with a variety of flows. Symmetric, supercritical, and circulation-control airfoil interferograms provided fringe patterns with shocks, separated flows, and high-pressure regions for evaluation. Regions along the polygon line with very clear fringe patterns yielded results within 1% of transducer measurements, while poorer quality regions, particularly near the leading and trailing edges, yielded results that were not as good

Sobre la convergencia del modelo GARCH(1,1)-M al movimiento geométrico browniano con reversión a la media

This paper shows, under certain conditions, the convergence of the GARCH (1.1)-M model to the geometric Brownian motion with mean reversion (diffusion GARCH process). The importance from this result is that the problem of inference on the parameters of the valuation models of options with stochastic volatility can be reduced by estimating the model GARCH (1.1)-M. It is also carried out a discussion on the assumptions that ensure the existence and uniqueness of the limit process. Finally, it is provided a quick demonstration of the convergence, which is less formal, but more intuitive and easy to remember.Convergencia de procesos estocásticos, valuación de derivados, volatilidad estocástica

El trastorno por estrés postraumático en los supervivientes al cáncer: una revisión de los tratamientos psicológicos disponibles

Objective: Posttraumatic stress disorder (PTSD) appears frequently in cancer survivors, but not all survivors meet the criteria propo­sed by the DSM-V to be diagnosed with PTSD. This situation may lead an underestimation of the problem and furthermore, in this patient group, PTSD is related with different aspects of psychological well-being, such as depres­sion, anxiety or quality of life, However, the­re are only a few psychological interventions designed to reduce these symptoms in cancer survivors. Method: A review of the psychological treatments available for PTSD in cancer sur­vivors in the last 10 years was performed. The data bases used were PubMed, Web of Science (WOS) and PsycInfo with the following des­criptors: PTSD (posttraumatic stress disorder) treatment cancer survivors y PTSS (posttrau­matic stress symptoms) treatment cancer sur­vivors. Results: The psychological interventions with more evidence are: cognitive-behavioral therapy and mindfulness, ahead other strate­gies such as stress management training, neu­ro-emotional therapy, coping skills training and counseling. Conclusions: Despite the relevance of PTSD in this patients group, psychological interventions needs more evidence to establish their efficacy to reduce these symptoms in survivors.Objetivo: El trastorno por estrés postrau­mático (TEP) aparece con frecuencia en los su­pervivientes al cáncer, pero no todos los super­vivientes cumplen con los criterios propuestos por el DSM-V para ser diagnosticados. Esta situación puede provocar la subestimación del problema y además, en este grupo de pacien­tes el TEP se relaciona con diferentes aspectos del bienestar psicológico, como la depresión, la ansiedad o la calidad de vida. Sin embargo, solo hay unas pocas intervenciones psicológi­cas diseñadas para reducir estos síntomas en los supervivientes al cáncer. Método: Se realizó una revisión de los tra­tamientos psicológicos disponibles para el TEP en los supervivientes al cáncer en los últimos 10 años. Las bases de datos utilizadas fueron PubMed, Web of Science (WOS) y PsycInfo con los siguientes descriptores: PTSD (post­traumatic stress disorder), treatment cancer survivors y PTSS (posttraumatic stress symp­toms) treatment cancer survivors. Resultados: Las intervenciones psicológi­cas con una mayor evidencia son: la terapia de tipo cognitivo-conductual y el mindfulness, por delante del entrenamiento en el manejo del estrés, la terapia neuro-emocional, el en­trenamiento en habilidades de afrontamiento y el counseling. Conclusiones: A pesar de la relevancia del TEP en este grupo de pacientes, las interven­ciones psicológicas necesitan de una mayor evidencia para establecer su eficacia para re­ducir estos síntomas en los supervivientes

Analytical Modeling of Interference Aware Power Control for the Uplink of Heterogeneous Cellular Networks

Inter-cell interference is one of the main limiting factors in current Heterogeneous Cellular Networks (HCNs). Uplink Fractional Power Control (FPC) is a well known method that aims to cope with such limiting factor as well as to save battery live. In order to do that, the path losses associated with Mobile Terminal (MT) transmissions are partially compensated so that a lower interference is leaked towards neighboring cells. Classical FPC techniques only consider a set of parameters that depends on the own MT transmission, like desired received power at the Base Station (BS) or the path loss between the MT and its serving BS, among others. Contrary to classical FPC, in this paper we use stochastic geometry to analyze a power control mechanism that keeps the interference generated by each MT under a given threshold. We also consider a maximum transmitted power and a partial compensation of the path loss. Interestingly, our analysis reveals that such Interference Aware (IA) method can reduce the average power consumption and increase the average spectral efficiency. Additionally, the variance of the interference is reduced, thus improving the performance of Adaptive Modulation and Coding (AMC) since the interference can be better estimated at the MT.Comment: 13 pages, 1 table and 7 figures. This work has been submitted to the IEEE for possible publication. Copyright may be transferred without notice, after which this version may no longer be accessibl

Condrosarcoma en pie

El condrosarcoma óseo en el pie es una lesión muy rara. Se presenta 1 caso de bajo grado de malignidad histológico y primario en su origen, que afecta al primer radio, tratado mediante resección amplia y sin signos de recidiva a los 3 años y medio de evolución.Bone chondrosarcoma very rarely affccts the foot. We report a case of primary bone chondrosarcoma vvith low grade malignancy involving the first metatarsal bone. Tumor was treated by wide resection. Three and half years later, there was not signs of recurrence

New Trends in Using Augmented Reality Apps for Smart City Contexts

The idea of virtuality is not new, as research on visualization and simulation dates back to the early use of ink and paper sketches for alternative design comparisons. As technology has advanced so the way of visualizing simulations as well, but the progress is slow due to difficulties in creating workable simulations models and effectively providing them to the users. Augmented Reality and Virtual Reality, the evolving technologies that have been haunting the tech industry, receiving excessive attention from the media and colossal growing are redefining the way we interact, communicate and work together. From consumer application to manufacturers these technologies are used in different sectors providing huge benefits through several applications. In this work, we demonstrate the potentials of Augmented Reality techniques in a Smart City (Smart Campus) context. A multiplatform mobile app featuring Augmented Reality capabilities connected to GIS services are developed to evaluate different features such as performance, usability, effectiveness and satisfaction of the Augmented Reality technology in the context of a Smart Campus

Organizational learning and innovation as sources of strategic fit

Purpose The purpose of this paper is to analyze the roles played by organizational learning (OL) and innovation in organizations immersed in the processes of adaptation and strategic fit in dynamic and turbulent environments. The authors analyze whether OL and innovation act as sources of strategic fit, and whether strategic fit positively affects performance. Design/methodology/approach The authors use data from a survey of a representative sample of 204 respondents from European firms active in high-technology sectors (response rate: 10.42 percent) and structural equation modeling (using the EQS 6.1 program) to undertake a transversal study. Findings The model confirms that OL and the capacity to innovate positively influence managers’ decisions to adapt their organizations to changes in dynamic environments. The achievement of strategic fit, in turn, improves organizational performance. The authors propose considering the innovation climate as a facilitator of new product and process development, although the innovation climate is not a direct antecedent of fit. Research limitations/implications This study is limited by the fact that the analysis is cross-sectional and by the fact that all measures used are based on managers’ perceptions. Practical implications Managers should create and support an entrepreneurial culture that stresses continuous learning. They should also foster programs aimed at developing abilities, and promote the development of capabilities that facilitate acceptance of organizational change. Investments in building certain capabilities, such as OL and the capacity to innovate, are strategically justified, especially in turbulent environments. Originality/value This study is one of the first to investigate the complex interactions among OL, innovation, strategic fit, and performance. The results improve our understanding of the links between strategic fit and performance

Hybrid Control of DC-DC Power Converters

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