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References
Effects of a Text-Writing Fluency Intervention for Postsecondary Students with Intellectual and Developmental Disabilities
EXCEPTIONALITY
Authors: Rodgers, Derek B.; Datchuk, S. M.; Rila, A. L.
Writing has implications for the academic, vocational, and social pursuits of students. Unfortunately, many students with disabilities - including those with intellectual and developmental disabilities - struggle with a foundational aspect of written expression: text writing within sentences and paragraphs. This study used a multiple-baseline across students' design to investigate the effects of a multicomponent intervention, explicit instruction with timed practice, on the fluent sentence text writing or sentence construction of four postsecondary students with intellectual and developmental disabilities. We tested effects on sentence text writing measures and application to paragraph text writing. Data were analyzed through visual analysis and Tau-U effect sizes. The results of the intervention suggest that the multicomponent intervention had mixed effects on the sentence text and paragraph text writing of students. How the study contributes to the broader writing literature is discussed and limitations are presented.
Effect of the transition rate between two excited states on the spectral dynamics of dual fluorescence: Blurring of the isoemissive point
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
We study the fluorescence spectral dynamics of a molecule with two excited fluorescent states (called the precursor and product) within the stochastic point transition model, which includes a consistent description of the dynamics of the particles distribution in excited states and transitions between them. Crucial changes in spectral dynamics with increasing the transition rate between the precursor and the product are discovered. Analysis of the results of spectral dynamics modeling allows us to determine how the transition rate between the precursor and the product affects the isoemissive point in the spectra collected with an increasing time delay. The following main regularities were revealed: fluorescence spectra with a short delay not exceeding several solvent relaxation times (tau(L)) may not pass through the isoemissive point; the isoemissive point shifts to the red with a decrease in reaction time constant (tau(eff)). The shifted isoemissive point exists in the range 10 tau(L) < tau(eff) < 40 tau(L). For faster reactions with 5 tau(L) < tau(eff) < 10 tau(L), the isoemissive point blurs. When the reaction proceeds in the ultrafast regime tau(eff) < 5 tau(L), the fluorescence spectrum shifts from a vicinity of the precursor spectrum to the product spectrum as a whole, changing its shape.