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Daigo Asaka,Christopher J. Dunn,Geoffrey R. Luckhurst,Tetsuo Miyamoto,Akihiko Sugimura,Bakir A. Timimi 한국물리학회 2006 Current Applied Physics Vol.6 No.5
It is important, both for basic science and device applications, to investigate the static and dynamic director distribution in a thinnematic liquid crystal (NLC) slab conned between two transparent electrodes. Optical and electrical measurement methods aregenerally used to determine the director distribution as a function of an electric eld. It is to be expected that deuterium NMR spec-troscopy combined with simultaneous in situ observation of the light transmittance should give us a good understanding of thedirector distribution for a thin NLC slab because the former is the sum of the spectra for each position in the slab and the latterby the optical anisotropy averaged over the slab. This combined method is used to investigate the director distribution in a thinNLC slab of 4-pentyl-40-cyanobiphenyl subject to competing constraints.
Seiichiro Himeno,Daigo Sumi,Hitomi Fujishiro 한국독성학회 2019 Toxicological Research Vol.35 No.4
The transport systems for metals play crucial roles in both the physiological functions of essential metals and the toxic effects of hazardous metals in mammals and plants. In mammalian cells, Zn transporters such as ZIP8 and ZIP14 have been found to function as the transporters for Mn(II) and Cd(II), contributing to the maintenance of Mn homeostasis and metallothionein-independent transports of Cd, respectively. In rice, the Mn transporter OsNramp5 expressed in the root is used for the uptake of Cd from the soil. Japan began to cultivate OsNramp5 mutant rice, which was found to accumulate little Cd, to prevent Cd accumulation. Inorganic trivalent arsenic (As(III)) is absorbed into mammalian cells via aquaglyceroporin, a water and glycerol channel. The ortholog of aquaporin in rice, OsLsi1, was found to be an Si transporter expressed in rice root, and is responsible for the absorption of soil As(III) into the root. Since rice is a hyperaccumulator of Si, higher amounts of As(III) are incorporated into rice compared to other plants. Thus, the transporters of essential metals are also utilized to incorporate toxic metals in both mammals and plants, and understanding the mechanisms of metal transports is important for the development of mitigation strategies against food contamination.
Inverse Design and Analysis of Supersonic Biplane
Kisa MATSUSHIMA,Daigo MARUYAMA,Ryota NOGUCHI 한국항공우주학회 2008 한국항공우주학회 학술발표회 논문집 Vol.- No.-
With the aim of realizing a new concept of supersonic transport, aerodynamic wing design and analysis are discussed based on Computational Fluid Dynamics. A biplane airfoil originated by A. Busemann was extended to 3-D wings with a design Mach number of 1.7. Euler simulations of several biplane wing configurations were conducted. Due to the existence of wing tips, biplane wings do not perform as well as biplane airfoils. This is because the wingtip areas are affected by the three dimensionality of Mach cone integration of influenced areas. The three-dimensionality precludes the occurrence of an appropriate pressure wave interaction. Induced drag due to lift is also generated there. Thus, the wingtip area has a large drag coefficient. To overcome these problems. a tapered wing was herein considered. Then, Aerodynamic design of wing section shapes of the tapered biplane wing was conducted using a recently devised inverse problem method. The designed biplane wing shows a better lift-to-drag ratio performance than the 2-D flat-plate airfoil in the range where the lift coefficient is more than 0.17. In addition, some desirable pressure wave interaction phenomena were found in the three dimensional biplane.