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Cr3+ doped Al2O3 nanoparticles: Effect of Cr3+ content in intensifying red emission
Lewis Prinston Melroy,N Keerthana,Hebbar N Deepak,Choudhari K.S.,Kulkarni Suresh D. 한국물리학회 2021 Current Applied Physics Vol.32 No.-
Cr3+-doped α-Al2O3 nanoparticles (Al2 xCrxO3, 0.005 ≤ x ≤ 0.05) were synthesized by co-precipitation method. X-ray diffraction (XRD) patterns of Cr3+:Al2O3 nanoparticles revealed the crystallite size of ~53 nm and electron microscopy (SEM & TEM) confirmed the spherical nanoparticle formation. Diffuse reflectance spectra (DRS) displayed peaks at 406 and 558 nm corresponding to the Cr3+ transitions which became prominent with the increase in Cr3+ concentration which was also evidenced by the gradually increasing pink coloration of the samples. Photoluminescence (PL) studies showed the sharp red emission at 694 nm (ruby line) which was observed for all samples. The Dq/B value for all samples was found to be greater than 2.3 confirming the presence of Cr3+ ions in the octahedral sites. Chromaticity diagrams displayed the maximum red appearance for the sample with x = 0.01 and a lifetime of 4 ms. The synthesized Cr3+:Al2O3 nanoparticles with smaller crystallite sizes and narrow near monochromatic emission can be used in various applications including sensing, lasing, and bioimaging applications.
Lewis R. Rambo 한국기독교교육정보학회 2011 Journal of Christian education information tech Vol.0 No.19
This paper seeks to discern themes and patterns in our search to make sense of the vicissitudes of current academic disciplines (especially religious education and pastoral psychology) through explorations of the resources of film, culture, and religion/spirituality. These resources provide cutting edge concepts, methods, and theories that can expand the horizons of religious education and pastoral psychology.
Lewis H. Lee 한국사회적질학회 2019 사회적질연구 Vol.3 No.2
More than 80,000 prisoners in state, federal, and private prisons work for private and for-profit industries in the United States, which is a relatively small, but rapidly growing, portion of the total number of incarcerated individuals. The main purpose of this article is to use critical concepts from Foucauldian theory to explore the relationship between incarceration and labor exploitation in the U.S. prison system. To do this, this article reviews the core Foucauldian concepts and assumptions that are relevant to explaining prison labor; applies those concepts and assumptions to the prison labor issue; and discusses a possible way for conducting an empirical study. Additionally, three implications for social work, policy intervention, and the Korean society in reference to the theory are discussed. This article suggests that understanding Foucault should be a priority to tackle forced control, unequal power, and the immobility of social and economic status embedded in the most marginalized and vulnerable populations.