Search results for "Espectro"
showing 10 items of 142 documents
Revisión de evidencias de las técnicas de DIR/Floortime™ para la intervención en niños y niñas con Trastornos del Espectro del Autismo
2020
The techniques of DIR/Floortime™ have taken a certain momentum in our country. The aim of this article is to analyze the evidence on the efficacy of these techniques for which four databases have been searched (PsychArticles, ERIC, PubMed and Medline). After refining the documents found by applying the inclusion/exclusion criteria, only 18 empirical studies were detected (7 single case studies, 3 quasi-experimental studies and 6 randomized clinical trials). Two of the studies are re-analyses of previous studies or follow-up studies. Once the different studies have been evaluated, it is concluded that more research is needed on the techniques of DIR/Floortime™. Although the evidence points t…
Determinación de cocaína por espectrometría vibracional
2017
RESUMEN DE LA TESIS DOCTORAL Clara María Pérez Alfonso. DETERMINACIÓN DE COCAÍNA POR ESPECTROMETRÍA VIBRACIONAL. Universitat de València. La cocaína es una sustancia con actividad anestésica y psicoactiva que se obtiene a partir de la hoja de la planta de la coca (Erythroxylon coca o Erythroxylon novogranatense). Esta sustancia es responsable de gran parte de los casos de hospitalización por problemas agudos y muertes relacionadas con el consumo de drogas en Europa. Es la droga de abuso objeto de mayor número de incautaciones después de la planta de cannabis y el hachis, la que se encuentra en matrices más variadas y la que sufre mayor adulteración de todas las sustancias ilegales que se an…
Proton Transfer and Protein Conformation Dynamics in Photosensitive Proteins by Time-resolved Step-scan Fourier-transform Infrared Spectroscopy
2014
Monitoring the dynamics of protonation and protein backbone conformation changes during the function of a protein is an essential step towards understanding its mechanism. Protonation and conformational changes affect the vibration pattern of amino acid side chains and of the peptide bond, respectively, both of which can be probed by infrared (IR) difference spectroscopy. For proteins whose function can be repetitively and reproducibly triggered by light, it is possible to obtain infrared difference spectra with (sub)microsecond resolution over a broad spectral range using the step-scan Fourier transform infrared technique. With -10(2)-10(3) repetitions of the photoreaction, the minimum num…
Photonic fractional Fourier transformer with a single dispersive device
2013
In this work we used the temporal analog of spatial Fresnel diffraction to design a temporal fractional Fourier transformer with a single dispersive device, in this way avoiding the use of quadratic phase modulators. We demonstrate that a single dispersive passive device inherently provides the fractional Fourier transform of an incident optical pulse. The relationships linking the fractional Fourier transform order and scaling factor with the dispersion parameters are derived. We first provide some numerical results in order to prove the validity of our proposal, using a fiber Bragg grating as the dispersive device. Next, we experimentally demonstrate the feasibility of this proposal by us…
Spectral Transmission of the Human Corneal Layers
2021
Este artículo se encuentra disponible en la siguiente URL: https://www.mdpi.com/2077-0383/10/19/4490 Este artículo de investigación pertenece a la sección "Ophthalmology". We have assessed the spectral transmittance of the different layers of the human cornea in the ultraviolet (UV), visible, and near-infrared (IR) spectral ranges. Seventy-four corneal sample donors were included in the study. Firstly, the corneal transmittance was measured using a spectrophotometer. Then, all samples were fixed for histopathological analysis, which allowed us to measure the thickness of each corneal layer. Finally, the absorption coefficients of the corneal layers were computed by a linear model reproducin…
La utilización de marfil de cachalote en el Calcolítico de Portugal
2013
Scientific analysis were undertaken within a research project concerning ivory objects from the Chalcolithic to Early Bronze Age of the Iberian Peninsula. In several of the analyses of objects from Portuguese Estremadura, especially V-perforated buttons, we could detect for the first time the presence of sperm whale ivory. This highlights the advantage and necessity of scientific analysis of ivory. It also clearly demonstrates that not all ivory used was ivory from African or Asian elephants, but we also did find ivory from the extinct Elephas antiquus, the hippopotamus and in this case sperm-whale. Thus, already in the Chalcolithic the raw material provenience was highly diverse, which in …
Trastornos del Espectro Autista : Guía para padres y profesionales
2012
A lo largo de los últimos años he sido testigo de múltiples intervenciones psico-educativas con familias que tienen que asumir el reto de educar un niño/a con Trastorno del Espectro Autista. Las primeras señales de alerta siempre son comunicadas a los profesionales por los padres con mucha angustia y pidiendo consejo, manifestando su falta de competencia en la educación de sus hijos/as. Efectivamente, primero antes de saber qué es lo que le pasa a su hijo/a los padres dudan de su competencia como padres, como educadores. Creen que no son capaces de educar a un hijo, incluso cuando ya son padres experimentados por tener más hijos. En el momento que empiezan a recibir información sobre la pos…
Familias especiales, familias excepcionales
2012
Este es un cómic que habla de familias excepcionales. Familias que se enfrentan al hecho de tener un hijo o una hija diferente. Y lo hacen con valentía, coraje y ganas de salir adelante. En este largo proceso cuentan con la ayuda y apoyo de los profesionales que forman el equipo de CUDAP, un centro que nos ofrece todo lo que necesitan nuestros niños y niñas, además de apoyo psicológico y orientación para las familias.
Phonon properties and photo-thermal oxidation of micromechanically exfoliated antimonene nanosheets
2020
Abstract Two-dimensional (2D) sheets of antimonene have attracted increasing attention due to their unique physical and chemical properties prompting potential for diverse applications. We present a facile method to prepare high-quality antimonene nanosheets (ANSs) by micromechanical exfoliation on SiO2/Si substrate. The temperature- and laser power-dependent Raman studies of exfoliated ANSs are reported and analyzed. It was found that both the out-of-plane A1g and the in-plane Eg modes red-shift linearly with increase in temperature, pointing towards anharmonic vibrations of the lattice. The thermal response of the ANSs on a SiO2/Si surface is also described using numerical simulation of t…
Carbon Nano-onions: Potassium Intercalation and Reductive Covalent Functionalization
2021
Herein we report the synthesis of covalently functionalized carbon nano-onions (CNOs) via a reductive approach using unprecedented alkali-metal CNO intercalation compounds. For the first time, an in situ Raman study of the controlled intercalation process with potassium has been carried out revealing a Fano resonance in highly doped CNOs. The intercalation was further confirmed by electron energy loss spectroscopy and X-ray diffraction. Moreover, the experimental results have been rationalized with DFT calculations. Covalently functionalized CNO derivatives were synthesized by using phenyl iodide and n-hexyl iodide as electrophiles in model nucleophilic substitution reactions. The functiona…