A green emitting SrAl2O4:Eu2,Dy2 phosphor with very bright and long lasting phosphorescence has been newly developed. The incorporation of Dy3 ion into the SrAl2O4:Eu2 system as an auxiliary activator dominates the phosphorescence, thermoluminescence, and photoconductivity characteristics of the phosphor to a large extent. Evidence is presented for the mechanism that the phoshorescence is ascribed to the photoconductivity due to holes, and to the trapping and thermal release of the holes by Dy3 ions in the system. The incorporation of the Dy2 ion forms a highly dense trapping level located at a suitable depth in relation to the thermal release rate at room temperature, thus producing the very bright and long phosphorescence.

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Because MOH has a diverse pathogenesis, various indicators should be evaluated. Among shock indicators, fibrinogen level was the best indicator of the need for blood transfusion following MOH.

BACKGROUND AND PURPOSE:The natural history and therapeutic management of dissecting vertebrobasilar aneurysms without ischemic or hemorrhagic stroke (nonstroke dissecting vertebrobasilar aneurysms) are not well-established. We conservatively followed patients with nonstroke dissecting vertebrobasilar aneurysms and evaluated the factors related to clinical and morphologic deterioration.