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Kenichi Nagaoka,Akihiro Shimizu,Katsumi Ida,Katsunori Ikeda,Katsuyoshi Tsumori,Kazuo Toi,Keisuke Matsuoka,Kiyomasa Watanabe,Masaki Osakabe,Mikiro Yoshinuma,Mitsutaka Isobe,Osamu Kaneko,Shoichi Okamura 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
The characteristics of neutral beam driven current have been investigated in helical devices, which do not need ohmic current to produce a magnetic field configuration. The neutral beam current drive experiments have been performed in a wide range of Zb/Zeff in LHD and CHS. The Z dependence of neutral beam driven current in the region of Zb/Zeff < 1 obtained by neon discharges in LHD agrees with the Ohkawa model. On the other hand, the current driven by neon beam injection in CHS cannot be explained by the Ohkawa model.
Vortex Cavitation from Baffle Plate and Pump Vibration in a Double-Suction Volute Pump
Sato, Toshiyuki,Nagahara, Takahide,Tanaka, Kazuhiro,Fuchiwaki, Masaki,Shimizu, Fumio,Inoue, Akira Korean Society for Fluid machinery 2011 International journal of fluid machinery and syste Vol.4 No.1
This study highlights especially the mechanism of vortex cavitation occurrence from the end of the suction duct in a double-suction volute pump and pump oscillation which causes cavitation noise from the pump. In this study, full 3D numerical simulations have been performed using a commercial code inside the pump from the inlet of suction duct to the outlet of delivery duct. The numerical model is based on a combination of multiphase flow equations with the truncated version of the Rayleigh-Plesset model predicting the complicated growth and collapse process of cavity bubbles. The experimental investigations have also been performed on the cavitating flow with flow visualization to evaluate the numerical results.
Abe, Ikue,Hara, Mitsuo,Seki, Takahiro,Cho, Sung June,Shimizu, Masaki,Matsuura, Kazunori,Cheong, Hae-Kap,Kim, Jin Young,Oh, Jihun,Jung, Jaehoon,Han, Mina The Royal Society of Chemistry 2019 Journal of Materials Chemistry C Vol.7 No.8
<P>The design of light-responsive fluorescent assembly systems with a variety of photochemical and photophysical properties is important for the fundamental understanding of the assembly-disassembly process as well as for applications such as optical information storage and fluorescence sensing. A major obstacle in constructing such photofunctional materials is the lack of a molecular design strategy for photoswitchable organic chromophores with aggregation-induced emission/aggregation-induced emission enhancement (AIE/AIEE) characteristics. Herein, we describe a new trigonal azobenzene framework showing AIE/AIEE characteristics and excellent photoisomerization (∼90%) from the <I>C</I>3-symmetric to asymmetric (including a bent-shaped <I>cis</I>-azobenzene) form. NMR experiments demonstrate light-induced molecular structure changes, which cause drastic symmetry breaking. The trigonal chromophores assemble into red fluorescent microspheres and their fluorescence intensity increases by ∼10-fold, confirming the AIE/AIEE characteristics. Importantly, scanning electron microscopy (SEM), optical microscopy (OM), and fluorescence optical microscopy (FOM) images substantiate that a noticeable light-driven melting occurs simultaneously with a marked fluorescence switching from on to off. Moreover, the fluorescent spheres are successfully applied in optical information storage and fluorescence sensing in a non-contact fashion.</P>
HOMOCLINIC ORBITS IN TRANSITIONAL PLANE COUETTE FLOW
Lustro, Julius Rhoan T.,Kawahara, Genta,van Veen, Lennaert,Shimizu, Masaki Korea Society of Computational Fluids Engineering 2015 한국전산유체공학회지 Vol.20 No.4
Recent studies on wall-bounded shear flow have emphasized the significance of the stable manifold of simple nonlinear invariant solutions to the Navier-Stokes equation in the formation of the boundary between the laminar and turbulent regions in state space. In this paper we present newly discovered homoclinic orbits of the Kawahara and Kida(2001) periodic solution in plane Couette flow. We show that as the Reynolds number decreases a pair of homoclinic orbits move closer to each other until they disappear to exhibit homoclinic tangency.
Homoclinic Orbits in Minimal Plane Couette Flow
Julius Rhoan T. Lustro,Genta Kawahara,Lennaert van Veen,Masaki Shimizu 한국전산유체공학회 2014 한국전산유체공학회 학술대회논문집 Vol.2014 No.10
In wall-bounded shear flow recent studies have pointed the significance of the stable manifold of nonlinear simple invariant solutions, referred to as edge states, to the Navier-Stokes equation in the formation of the laminar-turbulent boundary. Here we present homoclinic orbits of the periodic edge state found by Kawahara and Kida[1] in plane Couette flow. It is observed that these homoclinic orbits collide and disappear to exhibit homoclinic tangency as the Reynolds number decreases.
HOMOCLINIC ORBITS IN TRANSITIONAL PLANE COUETTE FLOW
Julius Rhoan T. Lustro,Genta Kawahara,Lennaert van Veen,Masaki Shimizu 한국전산유체공학회 2015 한국전산유체공학회지 Vol.20 No.4
Recent studies on wall-bounded shear flow have emphasized the significance of the stable manifold of simple nonlinear invariant solutions to the Navier-Stokes equation in the formation of the boundary between the laminar and turbulent regions in state space. In this paper we present newly discovered homoclinic orbits of the Kawahara and Kida(2001) periodic solution in plane Couette flow. We show that as the Reynolds number decreases a pair of homoclinic orbits move closer to each other until they disappear to exhibit homoclinic tangency.