Factor Structure of the Social Communication Questionnaire in Preschool Aged Autistic Children

© 2019, Springer Science+Business Media, LLC, part of Springer Nature. Objectives: The Social Communication Questionnaire (SCQ) is a common screening tool for autism spectrum disorder. Given its wide use, as well as recent changes to diagnostic criteria for autism, there is a need to evaluate whether the SCQ maps onto the social communication and interaction, and repetitive behaviour and restricted interests domains specified in the revised criteria in DSM-5. Methods: Participants included 294 preschool aged autistic children. Confirmatory factor analysis was implemented to evaluate the factor structure of the SCQ. Results: None of the models evaluated provided an adequate fit to the data. However, the best fitting model mapped onto the previous DSM-IV diagnostic criteria for autism. Conclusions: The SCQ does not align with the new DSM-5 domains. More research is needed to evaluate the factor structure of the SCQ in different populations of autistic children in order to determine its current validity as a screening tool

Electron conduction associated with the chemical transport of reducing elements in oxide cathode for CRT's application

In the present work, the formation of compounds associated to the diffusion of reducing elements (Mg, Al and W) to the Ni cap surface of oxide cathode has been studied by a new method. This method used two cathodes, one of them is coated and the other is uncoated, to be in an attach-contact mounted in a dummy tube. Different analytical techniques were used for this study: scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy (EDX) and I/V electrical measurements. After oxide cathode plus decomposited and activated, Al and Mg doping elements take place during heating to 810 degrees C (Ni-Br) under a rich controlled Ba/SrO atmosphere through an acceleration life test. It is shown that the chemical transport occurs mainly by a grain boundary mechanism with significant pile-up of Mg compounds. Al and W show a superficial concentrations and distribution. The dc electrical characteristic shows very strong rectifying behaviour through the M-S junction due to the I/V curves, particularly after 144 h acceleration life time. The characteristics are found to be reversible and reproducible, and viewed a rectification ratio (r) of 100. The calculated ideality factor shows a value of n = 9.6, which is evidenced to the tunnelling conduction. The theoretical calculation shows that the interface thickness grows to (similar to 6 mu m) after accelerated the cathode to 1896 h. (c) 2005 Elsevier B.V. All rights reserved