Search results for "Spectrum"
showing 10 items of 2043 documents
THE AVERAGE SIZE AND TEMPERATURE PROFILE OF QUASAR ACCRETION DISKS
2014
We use multi-wavelength microlensing measurements of a sample of 10 image pairs from 8 lensed quasars to study the structure of their accretion disks. By using spectroscopy or narrow band photometry we have been able to remove contamination from the weakly microlensed broad emission lines, extinction and any uncertainties in the large-scale macro magnification of the lens model. We determine a maximum likelihood estimate for the exponent of the size versus wavelength scaling ($r_s\propto \lambda^p$ corresponding to a disk temperature profile of $T\propto r^{-1/p}$) of $p=0.75^{+0.2}_{-0.2}$, and a Bayesian estimate of $p=0.8\pm0.2$, which are significantly smaller than the prediction of thi…
Search for heavy neutrinos in \(\pi ^{ + } \to \mu ^{ + }\nu \) decay and status of lepton universality test in the PIENU experiment
2019
International audience; In the present work of the PIENU experiment, heavy neutrinos were sought in pion decays \(\pi ^{ + } \to \mu ^{ + }\nu \). No evidence for extra peak was found in the muon kinetic energy spectrum and 90% confidence level upper limits were set on the neutrino mixing matrix \(|U_{\mu i}|^{2}\) in the mass range of 15.7 to 33.8 MeV/c^2, improving an order of magnitude over previous experiments. Current status of lepton universality test is also reported.
Multi-doped Brookite-Prevalent TiO2 Photocatalyst with Enhanced Activity in the Visible Light
2018
© 2018 Springer Science+Business Media, LLC, part of Springer Nature Abstract: Enabling solar and/or visible light-driven photocatalysis is a crucial step to access innovative applications in environmental science and sustainable energy. Titanium dioxide is the most used photocatalyst because of its low cost and toxicity, however it is also limitedly active under visible light irradiation due to its wide band gap. Among its polymorphs, brookite holds promising optoelectronic properties for visible light photocatalysis, which have to the best of our knowledge been limitedly exploited. Here, a C,S,N-doped brookite-based TiO2has been prepared via a rapid one-pot sol–gel synthesis. Besides subs…
QQ-onia package: a numerical solution to the Schrodinger radial equation for heavy quarkonium
2008
30 pages, 3 figures.-- ISI article identifier:000265158700009.-- ArXiv pre-print avaible at: http://arxiv.org/abs/0805.2704
Recombination processes in unintentionally doped GaTe single crystals
2002
Emission spectra of GaTe single crystals in the range of 1.90–1.38 eV have been analyzed at different temperatures and excitation intensities by photoluminescence, photoluminescence excitation, and selective photoluminescence. A decrease in band gap energy with an increase in temperature was obtained from the redshift of the free exciton recombination peak. The energy of longitudinal optical phonons was found to be 14±1 meV. A value of 1.796±0.001 eV for the band gap at 10 K was determined, and the bound exciton energy was found to be 18±0.3 meV. The activation energy of the thermal quenching of the main recombination peaks and of the ones relating to the ionization energy of impurities and…
Relationships between the social communication questionnaire and pragmatic language, socialization skills, and behavioral problems in children with a…
2019
The Social Communication Questionnaire (SCQ) is one of the most widely used screening instruments for autism spectrum disorder (ASD). This study examined the relationships between the reciprocal social interaction, communication, and repetitive/stereotyped factors on the Strength and Difficulties Questionnaire (SDQ) and pragmatic, socialization, and behavioral problems in children with ASD and children with typical development (TD). Participants were seven- to 11-year-old children with ASD without intellectual disability (
Corporate tax cuts and business-friendly policies in the UK - A review of electoral arguments during the 2015 legislative campaign
2016
The stance toward big business was a heated topic during Britain’s 2015 legislative campaign that led to the triumphal, albeit slightly unexpected, reelection of David Cameron, as Prime Minister. More profoundly, it raises the issue of the economic impact of corporate tax cuts and the nature of business-friendly policies in the UK. Firstly, we investigate the electoral arguments on both sides of the political spectrum. These discussions are framed within the overarching approach known as supply-side economics, which has been prevalent in English-speaking countries since the neoliberal revolution in the late 1970s. Secondly, we put forward the idea that widening inequalities, as suggested re…
Multispectral, Fluorescent and Photoplethysmographic Imaging for Remote Skin Assessment
2017
Optical tissue imaging has several advantages over the routine clinical imaging methods, including non-invasiveness (does not change the structure of tissues), remote operation (avoids infection) and ability to quantify the tissue condition by means of specific image parameters. Dermatologists and other skin experts need compact (preferably pocket-size), self-sustained and easy-to-use imaging devices. The operational principles and designs of ten portable in-vivo skin imaging prototypes developed at the Biophotonics Laboratory of Institute of Atomic Physics and Spectroscopy, University of Latvia during the recent five years are presented in this paper. Four groups of imaging devices are con…
FUNCIONES EJECUTIVAS Y MOTIVACIÓN DE NIÑOS CON TRASTORNO DE ESPECTRO AUTISTA (TEA) Y TRASTORNO POR DÉFICIT DE ATENCIÓN CON HIPERACTIVIDAD (TDAH)
2016
Resumen Objetivos. Comparar el perfil de niños con trastorno del espectro autista (TEA) y niños con trastorno por déficit de atención con hiperactividad (TDAH), presentación combinada, en componentes del funcionamiento ejecutivo (FE) y en comportamientos que están asociados al aprendizaje. Método. Participaron en esta investigación 16 niños con un diagnóstico clínico de TDAH y 16 niños con un diagnóstico clínico de TEA con alto nivel de funcionamiento que habían sido diagnosticados en servicios de Neuropediatría de la Comunidad Valenciana. Las edades estaban comprendidas entre 7 y 11 años. El 94% eran varones y se encontraban escolarizados en aulas ordinarias, estando equiparados los dos …
Exploring the profiles of children with autism spectrum disorder: association with family factors.
2019
This study aimed to identify different profiles of children with autism spectrum disorder (ASD) without intellectual disability (ID) and maternal factors characteristic of these profiles. Participants were 89 children between 7 and 11 years old and their mothers, distributed in two groups, 52 children with ASD and 37 with typical development (TD). Based on the children’s adaptive, behavioral, and pragmatic manifestations, three clusters were obtained in the ASD group. Children with the most serious difficulties in all the domains assessed were assigned to Cluster 1, whereas the children in Cluster 3 were characterized by relatively minor problems. Cluster 2 comprised children with moderate …