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Takagi, Hiroki,Sugawara, Shintaro,Saito, Tomoka,Tasaki, Haruka,Yuanxue, Lu,Kaiyun, Guan,Han, Dong-Sheng,Godo, Toshinari,Nakano, Masaru The Korean Society of Plant Biotechnology 2011 Plant biotechnology reports Vol.5 No.2
The gesneriaceous perennial plant Titanotrichum oldhamii has beautiful foliage and attractive bright yellow flowers. However, breeding of T. oldhamii by conventional sexual hybridization may be difficult because sexual reproduction of this species is very rare. In the present study, plant regeneration systems via both direct and indirect formation of adventitious shoots from leaf explants were established as the first step toward breeding T. oldhamii by using biotechnological techniques. Adventitious shoots were formed efficiently on medium containing $0.1mg\;l^{-1}$ benzyladenine. Histological observation showed that shoot formation on this medium occurred directly from leaf epidermal cells without callus formation. On the other hand, leaf explants formed calluses on medium containing $0.1mg\;l^{-1}$ 2,4-dichlorophenoxyacetic acid. The calluses could be maintained by monthly subculturing to fresh medium of the same composition. When the calluses were transferred to plant growth regulator-free medium, they formed adventitious shoots. Directly and indirectly formed shoots rooted well on medium containing $0.1mg\;l^{-1}$ indole-3-butyric acid. Plantlets thus obtained were successfully acclimatized and grew vigorously in the greenhouse. Flow cytometry analysis indicated that no variation in the ploidy level was observed in plants regenerated via direct shoot formation, whereas chromosome doubling occurred in several plants regenerated via indirect shoot formation. Regenerated plants with the same ploidy level as the mother plants showed almost the same phenotype as the mother plants, whereas chromosome-doubled plants showed apparent morphological alterations: they had small and crispate flowers, and round and deep green leaves.
Nontrivial Ferrimagnetism of the Heisenberg Model on the Union Jack Strip Lattice
Tokuro Shimokawa,Hiroki Nakano 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
We study the ground-state properties of the S = 1/2 antiferromagnetic Heisenberg model onthe Union Jack strip lattice by using the exact-diagonalization and density matrix renormalizationgroup methods. We confirm a region of a magnetization state intermediate between the N´eel-likespin liquid state and the conventional ferrimagnetic state of a Lieb-Mattis type. In the intermediatestate, we find that the spontaneous magnetization changes gradually with respect to the strength ofthe inner interaction. In addition, the local magnetization clearly shows an incommensurate modulationwith long-distance periodicity in the intermediate magnetization state. These characteristicbehaviors lead to the conclusion that the intermediate magnetization state is a non-Lieb-Mattisferrimagnetic one. We also discuss the relationship between the ground-state properties of theS = 1/2 antiferromagnetic Heisenberg model on the original Union Jack lattice and those on ourstrip lattice.
Novel Field-induced Quantum Phase Transition of the Kagome-lattice Antiferromagnet
Tˆoru Sakai,Hiroki Nakano 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
The magnetization process of the S = 1/2 kagome-lattice quantum antiferromagnet is investigatedusing the numerical exact diagonalization up to 36-site clusters. Our previous finite-size scalinganalysis with rhombic clusters indicated the “magnetization ramp” as a novel field-induced quantumphase transition at 1/3 the saturation magnetization. As another possible exotic behavior, we focuson the feature of the magnetization curve at 2/3 the saturation. The critical exponent analysisindicates that a different singular behavior occurs at the 2/3 magnetization.
Oxidation Behavior of WC-TiC-TaC Binderless Cemented Carbide under Low Partial Pressure of Oxygen
Uchiyama Yasuo,Ueno Shuji,Sano Hideaki,Tanaka Hiroki,Nakahara Kenji,Sakaguchi Shigeya,Nakano Osamu 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
WC-TiC-TaC binderless cemented carbide was oxidized under low partial pressure of oxygen (50ppm) at 873K for 1 to 20 h. Surface roughness was measured using atomic force microscope, and effect of TiC amount on oxidation behavior of the carbide was investigated. WC phase was oxidized more easily than WC-TiC-TaC solid solution phase. With an increase in TiC amount, WC-TiC-TaC phase increased and the oxidation resistance of the carbide increased.
Masaru Hashimoto,Tomoki Houda,Rito Furuchi,Hiroki Nakano,Kiyomi Okamoto,Toru Sakai 한국물리학회 2023 새물리 Vol.73 No.12
The magnetization process of the S = 1=2 distorted diamond quantum spin chain with the Ising-like anisotropic ferromagnetic interaction is investigated using the numerical diagonalization method. Two kinds of wide magnetization plateaux are found at 1=3 of the saturation magnetization based on the Haldane-like mechanism and the Néel-like mechanism, respectively. Apart from the magnetization plateaux, there appear the conventional Tomonaga-Luttinger liquid (TLL) phase and the two-magnon TLL phase. The latter phase is composed of the nematic TLL phase and the SDW TLL phase. The phase diagram with respect to the ferromagnetic interaction anisotropy parameter versus the magnetization is presented.
Toru Sakai,Masaru Hashimoto,Tomoki Houda,Rito Furuchi,Hiroki Nakano,Kiyomi Okamoto,Kouichi Okunishi 한국물리학회 2023 새물리 Vol.73 No.12
The magnetization process of the S = 1=2 ferromagnetic and antiferromagnetic bond-alternating chain with competing anisotropies is investigated using the numerical diagonalization of finite-size systems. It is found that when the easy-plane and easy-axis anisotropies are introduced at the ferromagnetic and antiferromagnetic bonds, respectively, the system possibly exhibits the 1/2 magnetization plateau with the spontaneous translational symmetry breaking. The phase diagrams with respect to the two anisotropies are presented.