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Matsui, Sadaoki,Uto, Shotaro,Yamada, Yasuhira,Watanabe, Shinpei The Society of Naval Architects of Korea 2018 International Journal of Naval Architecture and Oc Vol.10 No.3
The present paper considers the contact between energy-saving device of ice-class vessel and ice block. The main objective of this study is to clarify the tendency of the ice impact force and the structural response as well as interaction effects of them. The contact analysis is performed by using LS-DYNA finite element code. The main collision scenario is based on Finnish-Swedish ice class rules and a stern duct model is used as an energy-saving device. For the contact force, two modelling approaches are adopted. One is dynamic indentation model of ice block based on the pressure-area curve. The other is numerical material modelling by LS-DYNA. The authors investigated the sensitivity of the structural response against the ice contact pressure, the interaction effect between structure and ice block, and the influence of eccentric collision. The results of these simulations are presented and discussed with respect to structural safety.
DNA Ligand - Redox Active Molecule Conjugates as an Electrochemical DNA Probe
Ihara, Toshihiro,Maruo, Voshiyuki,Uto, Yoshihiro,Takenaka, Shigeori,Takagi, Makoto 한국분석과학회 1995 분석과학 Vol.8 No.4
Toward the development of universal, sensitive, and convenient method of DNA (or RNA) detection, two kinds of electrochemically active DNA ligands. acridine - viologen and oligonucleotide - ferrocene conjugate, were prepared. Thermodynamic and electrochemical study revealed that these probes bound strongly to DNA, and showed a typical cyclic voltammograms, indicating a potential for use as a reversible electrochemical labelling agent for DNA. Especially, using the electrochemically active oligonucleotide, we have been able to demonstrate the detection of DNA at femtomole levels by HPLC equipped with ordinary electrochemical detector (ECD). These results lead to the conclusion that the redox-active probes are very useful for the microanalysis of nucleic acid due to the stabilily of the complexes, high detection sensitivity, and wide applicability to the target structures (single- and double strands) and sequences.
Electrodeposited Fe-Co Films Prepared from a Citric-acid-based Plating Bath
T. Yanai,H. Uto,T. Shimokawa,M. Nakano,H. Fukunaga,K. Suzuki 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
Electrodeposited Fe-Co films are commonly prepared in a boric-acid-based bath. In this research,we applied citric acid instead of boric acid for the plating of Fe-Co films because boron in the wastebath is restricted by environmental-protection regulations in Japan. We evaluated the effect ofcitric acid on the magnetic and structural properties of the films. The saturation magnetization ofthe Fe-Co films slightly increased while the Fe content in the Fe-Co films decreased with increasingcitric acid concentration. The lowest coercivity value of 240 A/m was obtained at a citric acidconcentration of 100 g/L. The plating bath with this citric acid concentration enabled us to obtainFe-Co films with high saturation magnetizations and smooth surface morphologies.
Sadaoki Matsui,Shotaro Uto,Yasuhira Yamada,Shinpei Watanabe 대한조선학회 2018 International Journal of Naval Architecture and Oc Vol.10 No.3
The present paper considers the contact between energy-saving device of ice-class vessel and ice block. The main objective of this study is to clarify the tendency of the ice impact force and the structural response as well as interaction effects of them. The contact analysis is performed by using LS-DYNA finite element code. The main collision scenario is based on Finnish-Swedish ice class rules and a stern duct model is used as an energy-saving device. For the contact force, two modelling approaches are adopted. One is dynamic indentation model of ice block based on the pressure-area curve. The other is numerical material modelling by LS-DYNA. The authors investigated the sensitivity of the structural response against the ice contact pressure, the interaction effect between structure and ice block, and the influence of eccentric collision. The results of these simulations are presented and discussed with respect to structural safety.
Chemical Constituents from the Aerial Parts of Bupleurum falcatum L. and Biological Evidences
Nguyen Huu Tung,Takuhiro Uto,Osamu Morinaga,Yukihiro Shoyama 한국생약학회 2015 Natural Product Sciences Vol.21 No.2
In this study, phytochemical investigation on the aerial parts of Bupleurum falcatum resulted in the isolation of fourteen compounds including three quinic acid derivatives (1 - 3), five flavonoids (4 - 8), three monoterpene glycosides (9 - 11), and three saikosaponins (12 - 14). Compound 1 was first isolated from nature and unambiguously determined to be 3-O-feruloyl 5-O-caffeoylquinic acid on the basis of the extensive spectroscopic evidence. Biological testing revealed that saikosaponin A (12) and saikosaponin D (13) showed moderate anti-proliferative effects on HL-60 and HepG2 cancer cell lines.