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Korean Species of the Genus Hendecaneura Walsingham(Lepidoptera, Tortricidae)
Nasu, Yoshitsugu,Bae, Yang-Seop 한국응용곤충학회 2000 Insecta Koreana Vol.17 No.4
Two species of the genus Hendecaneura Walsingham in Korea, H. cervina Walsingham and H. apicipicta Walshingham, are reviewed. The latter is newly added to the moth fauna of Korae. Styrax obassia Sieb. et Zucc. is first recorded as the host plant of H. apicipicta. The adults and genitalia are illustrated.
Study of Current Distribution in PEMFC Stack Using Magnetic Sensor Probe
Nasu, Takumi,Matsushita, Yoshio,Okano, Jun,Okajima, Keiichi The Korean Institute of Electrical Engineers 2012 The Journal of International Council on Electrical Vol.2 No.4
The current distribution in a 1.2-kW PEMFC stack has been investigated using a triaxial magnetic sensor probe with the objective of determining the operating state of the PEMFC. The results show that the current distribution tended to concentrate on the underside of the cell. Current distribution was different in each cell because each cell had a different performance. In order to evaluate the performance of each cell, the I-V curve based on a model formula was calculated using the voltages obtained for each cell. Three cells having different cell performances were chosen and the relationship between the cell performance and the current distribution in the cell was evaluated. The results indicated that the standard deviations of current densities in the first and second cells were greater than that in the last one.
NASU Keiko,KINJO Yasuko,ISARIDA Toshiko,NAKAMURA Mieko,OJIMA Toshiyuki 아시아아동지원학회 2012 아시아아동지원연구 Vol.3 No.-
The consistency between 3 to 5-year-old children’s choice of facial expression stickers and the choices made by nursery school teachers and parents in health evaluations over a 4.5.month period were evaluated at 21 nursery schools in Japan. Children at the nursery schools chose facial expression stickers at health checks conducted immediately after arr?val at school a nd as they were leaving. For selected students, the teachers cond ucted health checks and chose a fac?al expression st?cker corresponding to their evaluation of the child’s cond?tion. At home, after the even?ng meal, the children and their parents conducted daily health checks, and each chose an appropriate facial expression sticker. Consistency rates and Cohen’s Kappa were calculated by age group for school arr?val and departure, and total arrivalsl departures for all sampled children throughout the entire study period. There was moderate consistency between ch?ldren and teachers ?mmediately after school arr?val, but cons?stency was lower at school departure, except for 5.yearold children. Levels of cons?stency were higher at home than at school for every age group. Using facial expression stickers in health checks could be a useful method for 3. to 5.year.old children, who may find it difficult to express their physical condition verbally
Korean Species of the Genus Hendecaneura Walsingham(Lepidoptera, Tortricidae)
Nasu, Yoshitsugu,Bae, Yang-Seop Korean Society of Applied Entomology 2000 INSECTA KOREANA Vol.17 No.4
Two species of the genus Hendecaneura Walsingham in Korea, H. cervina Walsingham and H. apicipicta Walshingham, are reviewed. The latter is newly added to the moth fauna of Korae. Styrax obassia Sieb. et Zucc. is first recorded as the host plant of H. apicipicta. The adults and genitalia are illustrated.
Yoshitsugu Nasu,Yositaka Sakamaki,Yasuhiro Tomioka 국립중앙과학관 2016 Journal of Asia-Pacific Biodiversity Vol.9 No.2
The immature stages of Oecia oecophila (Staudinger, 1876) (Schistonoeidae) are described and illustrated for the first time. The biological notes are provided, and the phylogenetic relationships of the family discussed.
Electron Correlation and Dynamical Jahn-Teller Effect in an Orbitally Degenerate System
Joji Nasu,Sumio Ishihara 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
Motivated by recent experiments on Ba3CuSb2O9, we study the dynamical Jahn-Teller effect ina spin-orbital coupled system. We analyze a low-energy model Hamiltonian which includes thesuperexchange-type interaction and the Jahn-Teller interaction by using a combined method of themean-field approximation and the quantum Monte-Carlo simulation. We find that magnetic ordersdo not appear in a wide parameter region and that the spin-dimer state with an orbital order isrealized. The orbital order is strongly suppressed by the dynamical Jahn-Teller effect.
Finite-Temperature Spin Dynamics and Transport Phenomena in Kitaev Quantum Spin Liquids
Joji Nasu 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.2
Quantum spin liquids (QSLs) have been the subject of great interest since Anderson’s suggestion. Recently, Kitaev proposed a canonical model of QSLs termed the Kitaev model on a honeycomb lattice (Fig. 1), which provides exact realizations of QSLs with topological order and fractional excitations. Moreover, exchange interactions in transition metal compounds with the strong spin-orbit coupling, such as iridium and ruthenium compounds, are suggested to be dominated by the Kitaev-type interaction. To discuss experimental results in the viewpoint of the Kitaev physics, we investigate the thermodynamic properties and spin dynamics of the Kitaev model. We calculate the specific heat using the quantum Monte Carlo simulations and find a double-peak structure, where half of the entropy is released at each peak. The result suggests that a quantum spin is fractionalized into two types of elementary excitations, itinerant Majorana fermions and localized Z2 fluxes, due to quantum many-body effects. We also find fingerprints of fractionalization in the spin dynamics. The fermionic temperature dependence in the Raman scattering and incoherent broad structure in the dynamical spin structure factor are the manifestations of the itinerant Majorana fermions. We also examine the thermal transport governed by the itinerant emergent Majorana fermions in the presence of the magnetic field. The thermal Hall conductivity shows nonmonotonic temperature dependence due to the Majorana chiral edge mode and the thermally fluctuating Z₂ gauge field emergent from the fractionalization of quantum spins. Finally, we discuss disorder effects on the Kitaev QSL, which inevitably exist in real materials. We investigate the impact of two types of disorder, bond randomness and site dilution, on the spin dynamics and transport in the Kitaev model. We compare the calculation results with experimental ones. The relevance to real materials will be discussed in the presentation. 〈그림 본문참조〉