Search results for " Triplet"
showing 3 items of 23 documents
Theoretical study of the electronic spectrum of p-benzoquinone
1999
The electronic excited states of p-benzoquinone have been studied using multiconfigurational second-order perturbation theory (CASPT2) and extended atomic natural orbital (ANO) basis sets. The calculation of the singlet–singlet and singlet–triplet transition energies comprises 19 valence singlet excited states, 4 valence triplet states, and the singlet 3s,3p, and 3d members of the Rydberg series converging to the first four ionization limits. The computed vertical excitation energies are found to be in agreement with the available experimental data. Conclusive assignments to both valence and Rydberg states have been performed. The main features of the electronic spectrum correspond to the π…
Estudio del proceso de abstracción de hidrógeno en derivados fotoactivos del colesterol
2016
La peroxidación lipídica (PL) es un proceso mediante el cual diversas especies reactivas atacan los lípidos de la membrana celular, promoviendo su degradación oxidativa. En diferentes estudios se ha demostrado que la PL puede producirse por radiación ultravioleta de tipo A en combinación con agentes fotosensibilizantes, los cuales al absorber luz pueden inducir una alteración física o química en otra entidad molecular. Entre estos agentes se encuentran algunos fármacos fotoactivos como los antiinflamatorios no esteroideos (AINEs) del grupo de los ácidos 2-arilpropiónicos, tales como el ketoprofeno (KP), el ácido tiaprofénico (TPA) y el suprofeno (SP). Estos fármacos poseen un grupo cromófor…
Optimization of the Speech Test Material in a Group of Hearing Impaired Subjects: A Feasibility Study for Multilingual Digit Triplet Test Development
2021
Background: The development of the global digit-in-noise test requires optimization of each language version on a group of normal-hearing native-speakers. An alternative solution may be an adaptive optimization during ongoing tests in a group of subjects with unknown hearing impairments. The objective of the research was to compare the optimization results between these groups. Methods: Digit triplets consisting of three pseudo-randomly selected digits were presented in speech-shaped noise at various signal-to-noise ratios (SNRs), according to the protocol of the final speech test. Digit-specific and position-specific speech reception thresholds (SRTs) were determined and compared between g…