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21.
Jae Ik Kim Dae-Ryong Jung Jongmin Kim Changwoo Nahm Sujin Byun Sungjun Lee Byungwoo Park 《Solid State Communications》2012,152(18):1767-1770
The enhancement of surface–plasmon-coupled photoluminescence from CdS nanoparticles was examined for various thicknesses of sputtered Au films. The improved luminescence with thickness control of Au correlated well with the increased density of surface–plasmon states, which was modified by the plasmon-dispersion relation at the planar Au/PMMA interface. By annealing the Au films to form a rough surface morphology, the emission in the CdS nanoparticles was further enhanced by the improved excitation and coupling of the surface–plasmon modes. 相似文献
22.
Choon-W. Nahm 《Journal of Physics and Chemistry of Solids》2012,73(7):834-838
The effect of Ta2O5 addition on microstructure, electrical properties, and dielectric characteristics of the quaternary ZnO–V2O5–MnO2 vaistor ceramics was investigated. Analysis of the microstructure indicated that the quaternary ZnO–V2O5–MnO2–Ta2O5 ceramics consisted of mainly ZnO grain and minor secondary phases such as Zn3(VO4)2, ZnV2O4, TaVO5, and Ta2O5. As the amount of Ta2O5 increased, the sintered density increased from 94.8 to 97.2% of the theoretical density (5.78 g/cm3 for ZnO), whereas the average grain size decreased from 7.7 to 6.0 μm. The ceramics added with 0.05 mol% Ta2O5 exhibited the highest breakdown field (2715 V/cm) and the highest nonlinear coefficient (20). However, further increase caused α to abruptly decrease. The Ta2O5 acted as a donor due to the increase of electron concentration in accordance with the amount of Ta2O5. The donor concentration increased from 1.97×1018 to 3.04×1018cm?3 with increasing the amount of Ta2O5 and the barrier height exhibited the maximum value (0.95 eV) at 0.05 mol% Ta2O5. 相似文献
23.
Werner Nahm 《Communications in Mathematical Physics》1988,118(1):171-176
Due to the Cappelli-Itzykson-Zuber classification, the minimal conformally invariant quantum field theories withSU(2) currents are classified by the ADE Lie algebras. Here I give a conceptual proof of the empirically valid relation between their partition functions and the Lie algebra exponents. 相似文献
24.
W. Nahm 《Communications in Mathematical Physics》1986,105(1):1-11
Open string models are classified using modular invariance. No good candidates for new models are found, though the existence of anE
8 invariant model inR
17, 1, a similar one inR
5, 1 and of a supersymmetric model inR
2, 1 cannot be excluded by this technique. An intriguing relation between the left moving and right moving sectors of the heterotic string emerges. 相似文献
25.
What is new in the field of neutrino detection? In addition to new projects probing both the low and high ends of the neutrino energy scale, an inexpensive, effective technique is being developed to allow tagging of antineutrinos in water Cherenkov (WC) detectors via the addition to water of a solute with a large neutron cross-section and energetic γ daughters. Gadolinium is an excellent candidate since in recent years it has become very inexpensive, now less than $8 per kilogram in the form of commercially available gadolinium trichloride. This non-toxic, non-reactive substance is highly soluble in water. Neutron capture on gadolinium yields an 8.0 MeV gamma cascade easily seen in detectors like Super-Kamiokande. The uses of GdCl3 as a possible upgrade for the Super-Kamiokande detector — with a view toward improving its performance as an antineutrino detector for supernova neutrinos and reactor neutrinos — are discussed, as are the ongoing R&;D efforts which aim to make this dream a reality within the next two years. 相似文献
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