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Kim, J.U.,Reddy, S.S.,Cui, L.S.,Nomura, H.,Hwang, S.,Kim, D.H.,Nakanotani, H.,Jin, S.,Adachi, C. North-Holland 2017 Journal of luminescence Vol.190 No.-
Two luminescent dibenzo[b,d]thiophene 5,5-dioxide derivatives combined with 9,9-dimethyl-9,10-dihydroacridine were synthesized and the appearance of thermally activated delayed fluorescence was confirmed. Both 3,7- and 2,8-bis(9,9-dimethyl-9,10-dihydroacridine)dibenzo[b,d]thiophene 5,5-dioxide (3ASOA) and (4ASOA) showed prompt and delayed fluorescence with high total photoluminescence (PL) quantum efficiencies of 72% and 88% in their doped films, respectively. The maximum external electroluminescence (EL) efficiencies of 13.8% in 4ASOA and 10.4% in 3ASOA were obtained. Further, 4ASOA showed slightly relaxed rolloff behavior, indicating that 2,8-substitution of the donors appreciably improved both PL and EL characteristics.
Numerical study of the effect of periodic jet excitation on cylinder aerodynamic instability
Hiejima, S.,Nomura, T. Techno-Press 2002 Wind and Structures, An International Journal (WAS Vol.5 No.2
Numerical simulations based on the ALE finite element method are carried out to examine the aerodynamics of an oscillating circular cylinder when the separated shear flows around the cylinder are stimulated by periodic jet excitation with a shear layer instability frequency. The excitation is applied to the flows from two points on the cylinder surface. The numerical results showed that the excitation with a shear layer instability frequency can reduce the negative damping and thereby stabilize the aerodynamics of the oscillating cylinder. The change of the lift phase seems important in stabilizing the cylinder aerodynamics. The change of lift phase is caused by the merger of the vortices induced by the periodic excitation with a shear layer instability frequency, and the vortex merging comes from the high growth rate, the rapid increase of wave number and decrease of phase velocity for the periodic excitation in the separated shear flows.
Separation of Micro-plastics from Sea Water Using Electromagnetic Archimedes Force
N. Nomura,F.Mishima,S.Nishijima 한국초전도저온학회 2023 한국초전도저온공학회논문지 Vol.25 No.3
Pollution of the environment by micro-plastics is now a worldwide problem. Plastics are difficult to decompose and put a greatload on the marine environment. Especially a plastic with a size of 5 mm or less is defined as micro-plastic and are carried by oceancurrents over long distances, causing global pollution. These are not easily decomposed in the natural environment. In this paper,we aimed to experimentally demonstrate that micro-plastics in seawater can be continuously separated by electromagneticArchimedes force. Using polyethylene particles of 3 mm in diameter as the separation target, a flow channel was fabricated andseparation conditions were investigated by particle trajectory calculations for separation experiments. Based on the calculationresults, a solenoid-type superconducting magnet was used as a source of magnetic field to conduct separation experiments of micro-plastics in seawater. Although a high separation rate was assumed in the simulation results, the experimental results did not showany significant improvement in the separation rate due to the electromagnetic Archimedes force. It was found that the gas generatedby the electrolytic reaction may have inhibited the migration of the particles.
Magnetic separation device for paramagnetic materials operated in a low magnetic field
F. Mishima,N. Nomura,S. Nishijima 한국초전도저온학회 2022 한국초전도저온공학회논문지 Vol.24 No.3
We have been developing a magnetic separation device that can be used in low magnetic fields for paramagnetic materials. Magnetic separation of paramagnetic particles with a small particle size is desired for volume reduction of contaminated soil inFukushima or separation of iron scale from water supply system in power plants. However, the implementation of the system hasbeen difficult due to the needed magnetic fields is high for paramagnetic materials. This is because there was a problem in installingsuch a magnet in the site. Therefore, we have developed a magnetic separation system that combines a selection tube and magneticseparation that can separate small sized paramagnetic particles in a low magnetic field. The selection tube is a technique forclassifying the suspended particles by utilizing the phenomenon that the suspended particles come to rest when the gravity actingon the particles and the drag force are balanced when the suspension is flowed upward. In the balanced condition, they can becaptured with even small magnetic forces. In this study, we calculated the particle size of paramagnetic particles trapped in aselection tube in a high gradient magnetic field. As a result, the combination of the selection tube and HGMS (High GradientMagnetic Separation-system) can separate small sized paramagnetic particles under low magnetic field with high efficiency, andthis paper shows its potential application.