Image processing of cylinder wake generation

In the present study, image processing techniques are applied to the chronophotographic visualizations of a cylinder wake generation. The flow patterns obtained by means of tracer particles are digitalized and processed in order to characterize the flow. This characterization is carried out by determining the evolution of the geometric parameters governing the wake, together with the streamfunction, vorticity, and pressure distributions. The present study reaches the moment of shedding of the first pair of vortices

Lipoma Intraóseo

Se comunica un caso clínico de Lipoma Intraóseo de tibia con diagnóstico anatomopatológico confirmado, que constituye en la revisión bibliográfica el número 35. Se realiza, a propósito de este caso clínico, el estudio de otras lesiones con las que es obligado establecer el diagnóstico diferencial.The authors describe a medical case of Intrabone Tibial Lypoma with anatomical-patology confirmed that constitutes in the bibliografical revision numbe r 35. They realize, abolit this clinic case the review of other lesions with which they must establish the differential diagnosis

Tracing developmental trajectories of oppositional defiant behaviors in preschool children

Objective: Previous studies on developmental trajectories have used ad hoc definitions of oppositional defiant behaviors (ODB), which makes it difficult to compare results. This article defines developmental trajectories of ODB from ages 3-5 based on five different standard measurements derived from three separate instruments. -- Method: A sample of 622 three-year-old preschoolers, followed up at ages 4, 5, and 6, was assessed with the five measures of oppositionality answered by parents and teachers. Growth-Mixture-Modeling (GMM) estimated separate developmental trajectories for each ODB measure for ages 3 to 5. -- Results: The number of classes-trajectories obtained in each GMM depended on the ODB measure, but two clear patterns emerged: four trajectories (persistent low, decreasers, increasers/high increasers, persistent moderate/persistent high) or three trajectories (persistent low, decreasers, increasers/high increasers). Persistent high trajectories accounted for 4.4%-9.5% of the children. The trajectories emerging from the different ODB measures at ages 3 to 5 discriminated disruptive disorders, comorbidity, use of services, and impairment at age 6, and globally showed a similar pattern, summarizing longitudinal information on oppositionality in preschool children in a similar way. -- Conclusions: Trajectories resulting from standard scales of the questionnaires have predictive validity for identifying relevant clinical outcomes, but are measure-specific. The results contribute to knowledge about the development of ODB in preschool children

Ultraviolet and visible emissions of Er3+ in KY(WO4)2 single crystals co-doped with Yb 3+ ions

Abstract In this paper we studied the luminescence of Er 3+ in KY(WO 4 ) 2 co-doped with Yb 3+ at room temperature and at cryogenic temperature in the 360-860 nm range. We found 13 emissions of erbium in the ultraviolet and visible range, and studied the emissions after two pump wavelengths, one at 981 nm resonant to the maximum absorption of ytterbium and one at 798 nm resonant to the 4 I 9/2 energy level of erbium.