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103 results on '"Arasa, J."'

1. Impact of rotavirus vaccination on seizure hospitalizations in children: A systematic review

Author

ARASA J, LOPEZ M, DIEZ J, and ORRICO A

Subjects
Rotavirus, General Veterinary, General Immunology and Microbiology, Vaccination, Public Health, Environmental and Occupational Health, Rotavirus Vaccines, Infant, Rotavirus vaccines, Rotavirus Infections, Hospitalization, Infectious Diseases, children, Seizures, Child, Preschool, Molecular Medicine, Humans, Child, convusions, seizures
Abstract

BACKGROUND: Previous studies found conflicting results about the effect of rotavirus (RV) vaccination on seizure hospitalizations in children younger than 5 years old. OBJECTIVES: To evaluate the evidence of the impact of RV vaccination on the prevention of seizure hospitalizations in children. METHODS: A systematic review was conducted in the electronic database MEDLINE of all observational studies in children younger than 5 years old published since 2006. Two reviewers performed title/abstract, full-text review, and data extraction. RESULTS: Thirteen studies met eligibility criteria. Nine studies reported a significant reduction in seizure hospitalizations upon RV vaccine introduction, three studies reported an absence of significant impact, and one study reported a significant rise in seizure hospitalization after the introduction of RV vaccines. LIMITATIONS: The great variability between study designs, case definitions and potential biases prevent quantifying the impact of RV vaccination against seizure hospitalizations. CONCLUSIONS: RV vaccination might prevent seizure hospitalizations in children; however, robust, and well-designed studies are needed to better determine the strength of this association.

Published
2021

5. Optical behavior simulation of the divergence adapter elements in a Ronchi deflectometry configuration for convex surfaces.

Author

Gonzales, F. and Arasa, J.

Subjects
*CONVEX surfaces, *SHAPE measurement
Abstract

The primary purpose of this article is to show the simulation of the optical behavior of the divergence adapter elements in the Ronchi deflectometry configuration to measure convex surfaces, which so far has not been reported in the literature. The use of divergence adapter elements is mandatory when Ronchi deflectometry is used to obtain the shape of a convex surface. Otherwise, light reflected by the surface cannot be collected into the measuring stage. Divergence adapters must be included in both arms of the Ronchi deflectometry configuration, keeping in mind that their optical behaviors affect the surface shape measurement. Before carrying out an experimental setup, we analyzed these elements' effects through an optical simulation of the selected Ronchi. From the analysis of the optical simulation, we can check the adequacy of the divergence adapter for the expected measuring range and required accuracy; the decision about its suitability has been taken by looking if the relations between slope and position at the apex of the convex surface was unequivocal. In this paper, we present the Ronchi configuration chosen to measure convex surfaces, the selected lenses for the divergence adapters, the thresholds linked to the sampler's elements, the optical simulation, and the criteria used to answer if the behavior of the divergence adapters is appropriated for the radii interval that we want to measure. Finally, a unique polynomial expression is proposed to transfer slope and position values from the sampling elements of the apex plane of the surface to be measured. [ABSTRACT FROM AUTHOR]

Published
2022
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12. Connectedness and psychological well-being among adolescents of immigrant background in Kenya

Author

Abubakar, A., van de Vijver, F.J.R., Mazrui, L., Murugami, M., Arasa, J., Dimitrova, R., Bender, M., Vijver, F.J.R., Department of Culture Studies, and Crosscultural Psychology

Subjects
Social connectedness, Psychological well-being, media_common.quotation_subject, Immigration, Ethnic group, Life satisfaction, Context (language use), Psychology, Research question, Peer attachment, Social psychology, media_common, Developmental psychology
Abstract

Little—if anything—is known about the factors that contribute to the positive development and psychological functioning of adolescents of immigrant background in the African context. The present study addresses this knowledge gap by investigating the influence of parent and peer attachment, the sense of school belonging, and religious and ethnic identity on the psychological well-being of adolescents of Arab and Asian background in Kenya. The central research question is to what extent adolescent connectedness influences psychological well-being.

Published
2014

18. Influencia del número de elementos reemisores en el modelado de difusores durante la etapa de optimización.

Author

Blanco, P. and Arasa, J.

Abstract

Inside the process of optical design, the diffusion phenomenon is usually set apart until the final stage: the study of tolerances. So, its influence is evaluated considering the whole of the system after having designed it taking into account all other parameters. The phenomenon of diffusion is relevant in many optical designs and its influence can determine the final design. So, this procedure, relegating diffusion to stage study, does not means that its influence over the system isn't heavy, but stems from the high computational cost of considering it on earlier stages. But there is a way to include it before the tolerances study stage by using a dual optimization process with an on/off mechanism. Thus the best system configuration is obtained considering the diffusion. In order to reduce the computation time we adjust dynamically the values of the diffuser model control parameters. The number of re-emitters is one of these strategic control parameters, inside this parameter are included two different values, the number of reemitting focus and the number of reemitting rays considered. Varying this value, different degrees of model accuracy can be obtained, allowing to adapt the model accuracy depending on the merit function instantaneous value. In this paper we analyse the use of a diffuser model, varying the parameter of the number of reemitters, and its influence on optical system computer aided design (CAD). We make so by employing a simple system consisting on a light source, a biconvex lens, on which the diffusion model is applied only on the second surface, and a detection display. [ABSTRACT FROM AUTHOR]

Published
2016
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