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Articles 21301 - 21302 of 21302
Full-Text Articles in Entire DC Network
Understanding The Emission From Semiconductor Nanoparticles, Beth Ann Manhat
Understanding The Emission From Semiconductor Nanoparticles, Beth Ann Manhat
Dissertations and Theses
This dissertation describes the synthesis and characterization of fluorescent semiconductor nanoparticles (NPs) in order to optimize their biomedical utility for imaging and sensing applications. While both direct and indirect bandgap semiconductor NPs have been studied, control over their emission properties vary. Quantum confinement (QC), which primarily controls the emission wavelength of nanosized semiconductors, dictates that as the size of semiconductor NPs decrease, the magnitude of the bandgap increases, resulting in changes in the observed emission wavelength: smaller NPs have a larger bandgap, and thus a bluer emission. However, surface, interfacial, or shell defects can act as non-radiative or radiative recombination …
Designing Wise Communities That Engage In Creative Problem Solving: An Analysis Of An Online Design Model, Charlotte Nirmalani Gunawardena, Ludmila Layne, Casey Frechette
Designing Wise Communities That Engage In Creative Problem Solving: An Analysis Of An Online Design Model, Charlotte Nirmalani Gunawardena, Ludmila Layne, Casey Frechette
University Libraries & Learning Sciences Faculty and Staff Publications
Addressing the conference theme of “design thinking,” this paper discusses an instructional design model, WisCom (Wisdom Communities) that we developed to build a wise learning community online, to solve open-ended, ill-structured problems such as solving a health crisis or an environmental disaster, which requires the exchange of multiple perspectives, inter-disciplinary thinking, creative problem solving, and social construction of knowledge. Based on socio-constructivist, sociocultural theories of learning and mediated cognition (Vygotsky, 1978), distributed cognition (Hutchins, 1995; Pea, 1993), group cognition (Stahl, 2006), research on how people learn (Bransford, Vye, Bateman, Brophy, & Roselli, 2004), and distance education design principles (Moore & …