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RISS 인기검색어
- 검색키워드
- 저자 : Alexander Fomin (검색결과 2 건)
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Quantum-Structure-Dependent Excitonic Carrier Dynamics of InxGa1-xN/GaN Multi-Quantum-Wells
Sangsu Hong,Alexander Fomin,Bae Kyun Kim,Gyu Han Lee,조형균,Je Won Kim,June Sik Park,주태하,Yong Seok Kim,Young Joon Yoon 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.6
The excitonic carrier dynamics taking place in In$_x$Ga$_{1-x}$N/GaN multi-quantum-well systems have been studied by using low temperature picosecond-time-resolved photoluminescence (LT-TRPL), high resolution transmission electron microscopy (HR-TEM), X-ray photoelectron spectroscopy (XPS), Dynamic time of flight secondary ion mass spectrometry (TOF-SIMS), and quantum mechanical simulation methods. Both time-integrated and time-resolved photoluminescence spectra of In$_x$Ga$_{1-x}$N/GaN multi-quantum-wells with different well thicknesses and indium compositions were measured at 10 K. We assigned the natural radiative lifetime of each sample from the time-resolved PL. We observed that the natural radiative lifetime of In In$_x$Ga$_{1-x}$N/GaN multi-quantum-wells depended strongly on the well thickness and the indium composition. To support the measured natural radiative lifetimes, we calculated the excitonic oscillator strengths of the In$_x$Ga$_{1-x}$N/GaN multi-quantum-wells as functions of well thickness and indium composition by using a 2-D particle-in-a-box model. Values of the well thicknesses and indium compositions from the HR-TEM and XPS compositional depth profiling were used to achieve more realistic computational results and to corroborate the measured natural radiative lifetimes of In$_x$Ga$_{1-x}$N/GaN multi-quantum wells.
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Biodynamic parameters of micellar diminazene in sheep erythrocytes and blood plasma
Sergey A. Staroverov,Vladimir A. Sidorkin,Sergey Yu. Shchyogolev,Lev A. Dykman,Alexander S. Fomin 대한수의학회 2011 Journal of Veterinary Science Vol.12 No.4
In this work, we used a preparation of diminazene, which belongs to the group of aromatic diamidines. This compound acts on the causative agents of blood protozoan diseases produced by both flagellated protozoa (Trypanosoma) and members of the class Piroplasmida (Babesia, Theileria, and Cytauxzoon) in various domestic and wild animals, and it is widely used in veterinary medicine. We examined the behavior of water-disperse diminazene (immobilized in Tween 80 micelles) at the cellular and organismal levels. We assessed the interaction of an aqueous and a water-disperse preparation with cells of the reticuloendothelial system. We compared the kinetic parameters of aqueous and water-disperse diminazene in sheep erythrocytes and plasma. The therapeutic properties of these two preparations were also compared. We found that the surface-active substances improved intracellular penetration of the active substance through interaction with the cell membrane. In sheep blood erythrocytes, micellar diminazene accumulated more than its aqueous analog. This form was also more effective therapeutically than the aqueous analog. Our findings demonstrate that use of micellar diminazene allows the injection dose to be reduced by 30%.
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